From 55ed51fff224a51dfb768cfac3e4498888474c87 Mon Sep 17 00:00:00 2001 From: Sudip Mukherjee Date: Sun, 17 Nov 2019 20:24:35 +0000 Subject: {tty: serial, nand: onenand}: samsung: rename to fix build warning Any arm config which has 'CONFIG_MTD_ONENAND_SAMSUNG=m' and 'CONFIG_SERIAL_SAMSUNG=m' gives a build warning: warning: same module names found: drivers/tty/serial/samsung.ko drivers/mtd/nand/onenand/samsung.ko Rename both drivers/tty/serial/samsung.c to drivers/tty/serial/samsung_tty.c and drivers/mtd/nand/onenand/samsung.c drivers/mtd/nand/onenand/samsung_mtd.c to fix the warning. Signed-off-by: Sudip Mukherjee Acked-by: Richard Weinberger Link: https://lore.kernel.org/r/20191117202435.28127-1-sudipm.mukherjee@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/Makefile | 2 +- drivers/tty/serial/samsung.c | 2595 -------------------------------------- drivers/tty/serial/samsung_tty.c | 2595 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 2596 insertions(+), 2596 deletions(-) delete mode 100644 drivers/tty/serial/samsung.c create mode 100644 drivers/tty/serial/samsung_tty.c (limited to 'drivers/tty') diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile index 863f47056539..d056ee6cca33 100644 --- a/drivers/tty/serial/Makefile +++ b/drivers/tty/serial/Makefile @@ -30,7 +30,7 @@ obj-$(CONFIG_SERIAL_PXA_NON8250) += pxa.o obj-$(CONFIG_SERIAL_PNX8XXX) += pnx8xxx_uart.o obj-$(CONFIG_SERIAL_SA1100) += sa1100.o obj-$(CONFIG_SERIAL_BCM63XX) += bcm63xx_uart.o -obj-$(CONFIG_SERIAL_SAMSUNG) += samsung.o +obj-$(CONFIG_SERIAL_SAMSUNG) += samsung_tty.o obj-$(CONFIG_SERIAL_MAX3100) += max3100.o obj-$(CONFIG_SERIAL_MAX310X) += max310x.o obj-$(CONFIG_SERIAL_IP22_ZILOG) += ip22zilog.o diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c deleted file mode 100644 index 83fd51607741..000000000000 --- a/drivers/tty/serial/samsung.c +++ /dev/null @@ -1,2595 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Driver core for Samsung SoC onboard UARTs. - * - * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics - * http://armlinux.simtec.co.uk/ -*/ - -/* Hote on 2410 error handling - * - * The s3c2410 manual has a love/hate affair with the contents of the - * UERSTAT register in the UART blocks, and keeps marking some of the - * error bits as reserved. Having checked with the s3c2410x01, - * it copes with BREAKs properly, so I am happy to ignore the RESERVED - * feature from the latter versions of the manual. - * - * If it becomes aparrent that latter versions of the 2410 remove these - * bits, then action will have to be taken to differentiate the versions - * and change the policy on BREAK - * - * BJD, 04-Nov-2004 -*/ - -#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) -#define SUPPORT_SYSRQ -#endif - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include - -#include "samsung.h" - -#if defined(CONFIG_SERIAL_SAMSUNG_DEBUG) && \ - !defined(MODULE) - -extern void printascii(const char *); - -__printf(1, 2) -static void dbg(const char *fmt, ...) -{ - va_list va; - char buff[256]; - - va_start(va, fmt); - vscnprintf(buff, sizeof(buff), fmt, va); - va_end(va); - - printascii(buff); -} - -#else -#define dbg(fmt, ...) do { if (0) no_printk(fmt, ##__VA_ARGS__); } while (0) -#endif - -/* UART name and device definitions */ - -#define S3C24XX_SERIAL_NAME "ttySAC" -#define S3C24XX_SERIAL_MAJOR 204 -#define S3C24XX_SERIAL_MINOR 64 - -#define S3C24XX_TX_PIO 1 -#define S3C24XX_TX_DMA 2 -#define S3C24XX_RX_PIO 1 -#define S3C24XX_RX_DMA 2 -/* macros to change one thing to another */ - -#define tx_enabled(port) ((port)->unused[0]) -#define rx_enabled(port) ((port)->unused[1]) - -/* flag to ignore all characters coming in */ -#define RXSTAT_DUMMY_READ (0x10000000) - -static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port) -{ - return container_of(port, struct s3c24xx_uart_port, port); -} - -/* translate a port to the device name */ - -static inline const char *s3c24xx_serial_portname(struct uart_port *port) -{ - return to_platform_device(port->dev)->name; -} - -static int s3c24xx_serial_txempty_nofifo(struct uart_port *port) -{ - return rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE; -} - -/* - * s3c64xx and later SoC's include the interrupt mask and status registers in - * the controller itself, unlike the s3c24xx SoC's which have these registers - * in the interrupt controller. Check if the port type is s3c64xx or higher. - */ -static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port) -{ - return to_ourport(port)->info->type == PORT_S3C6400; -} - -static void s3c24xx_serial_rx_enable(struct uart_port *port) -{ - unsigned long flags; - unsigned int ucon, ufcon; - int count = 10000; - - spin_lock_irqsave(&port->lock, flags); - - while (--count && !s3c24xx_serial_txempty_nofifo(port)) - udelay(100); - - ufcon = rd_regl(port, S3C2410_UFCON); - ufcon |= S3C2410_UFCON_RESETRX; - wr_regl(port, S3C2410_UFCON, ufcon); - - ucon = rd_regl(port, S3C2410_UCON); - ucon |= S3C2410_UCON_RXIRQMODE; - wr_regl(port, S3C2410_UCON, ucon); - - rx_enabled(port) = 1; - spin_unlock_irqrestore(&port->lock, flags); -} - -static void s3c24xx_serial_rx_disable(struct uart_port *port) -{ - unsigned long flags; - unsigned int ucon; - - spin_lock_irqsave(&port->lock, flags); - - ucon = rd_regl(port, S3C2410_UCON); - ucon &= ~S3C2410_UCON_RXIRQMODE; - wr_regl(port, S3C2410_UCON, ucon); - - rx_enabled(port) = 0; - spin_unlock_irqrestore(&port->lock, flags); -} - -static void s3c24xx_serial_stop_tx(struct uart_port *port) -{ - struct s3c24xx_uart_port *ourport = to_ourport(port); - struct s3c24xx_uart_dma *dma = ourport->dma; - struct circ_buf *xmit = &port->state->xmit; - struct dma_tx_state state; - int count; - - if (!tx_enabled(port)) - return; - - if (s3c24xx_serial_has_interrupt_mask(port)) - s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM); - else - disable_irq_nosync(ourport->tx_irq); - - if (dma && dma->tx_chan && ourport->tx_in_progress == S3C24XX_TX_DMA) { - dmaengine_pause(dma->tx_chan); - dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state); - dmaengine_terminate_all(dma->tx_chan); - dma_sync_single_for_cpu(ourport->port.dev, - dma->tx_transfer_addr, dma->tx_size, DMA_TO_DEVICE); - async_tx_ack(dma->tx_desc); - count = dma->tx_bytes_requested - state.residue; - xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1); - port->icount.tx += count; - } - - tx_enabled(port) = 0; - ourport->tx_in_progress = 0; - - if (port->flags & UPF_CONS_FLOW) - s3c24xx_serial_rx_enable(port); - - ourport->tx_mode = 0; -} - -static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport); - -static void s3c24xx_serial_tx_dma_complete(void *args) -{ - struct s3c24xx_uart_port *ourport = args; - struct uart_port *port = &ourport->port; - struct circ_buf *xmit = &port->state->xmit; - struct s3c24xx_uart_dma *dma = ourport->dma; - struct dma_tx_state state; - unsigned long flags; - int count; - - - dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state); - count = dma->tx_bytes_requested - state.residue; - async_tx_ack(dma->tx_desc); - - dma_sync_single_for_cpu(ourport->port.dev, dma->tx_transfer_addr, - dma->tx_size, DMA_TO_DEVICE); - - spin_lock_irqsave(&port->lock, flags); - - xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1); - port->icount.tx += count; - ourport->tx_in_progress = 0; - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(port); - - s3c24xx_serial_start_next_tx(ourport); - spin_unlock_irqrestore(&port->lock, flags); -} - -static void enable_tx_dma(struct s3c24xx_uart_port *ourport) -{ - struct uart_port *port = &ourport->port; - u32 ucon; - - /* Mask Tx interrupt */ - if (s3c24xx_serial_has_interrupt_mask(port)) - s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM); - else - disable_irq_nosync(ourport->tx_irq); - - /* Enable tx dma mode */ - ucon = rd_regl(port, S3C2410_UCON); - ucon &= ~(S3C64XX_UCON_TXBURST_MASK | S3C64XX_UCON_TXMODE_MASK); - ucon |= (dma_get_cache_alignment() >= 16) ? - S3C64XX_UCON_TXBURST_16 : S3C64XX_UCON_TXBURST_1; - ucon |= S3C64XX_UCON_TXMODE_DMA; - wr_regl(port, S3C2410_UCON, ucon); - - ourport->tx_mode = S3C24XX_TX_DMA; -} - -static void enable_tx_pio(struct s3c24xx_uart_port *ourport) -{ - struct uart_port *port = &ourport->port; - u32 ucon, ufcon; - - /* Set ufcon txtrig */ - ourport->tx_in_progress = S3C24XX_TX_PIO; - ufcon = rd_regl(port, S3C2410_UFCON); - wr_regl(port, S3C2410_UFCON, ufcon); - - /* Enable tx pio mode */ - ucon = rd_regl(port, S3C2410_UCON); - ucon &= ~(S3C64XX_UCON_TXMODE_MASK); - ucon |= S3C64XX_UCON_TXMODE_CPU; - wr_regl(port, S3C2410_UCON, ucon); - - /* Unmask Tx interrupt */ - if (s3c24xx_serial_has_interrupt_mask(port)) - s3c24xx_clear_bit(port, S3C64XX_UINTM_TXD, - S3C64XX_UINTM); - else - enable_irq(ourport->tx_irq); - - ourport->tx_mode = S3C24XX_TX_PIO; -} - -static void s3c24xx_serial_start_tx_pio(struct s3c24xx_uart_port *ourport) -{ - if (ourport->tx_mode != S3C24XX_TX_PIO) - enable_tx_pio(ourport); -} - -static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport, - unsigned int count) -{ - struct uart_port *port = &ourport->port; - struct circ_buf *xmit = &port->state->xmit; - struct s3c24xx_uart_dma *dma = ourport->dma; - - - if (ourport->tx_mode != S3C24XX_TX_DMA) - enable_tx_dma(ourport); - - dma->tx_size = count & ~(dma_get_cache_alignment() - 1); - dma->tx_transfer_addr = dma->tx_addr + xmit->tail; - - dma_sync_single_for_device(ourport->port.dev, dma->tx_transfer_addr, - dma->tx_size, DMA_TO_DEVICE); - - dma->tx_desc = dmaengine_prep_slave_single(dma->tx_chan, - dma->tx_transfer_addr, dma->tx_size, - DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT); - if (!dma->tx_desc) { - dev_err(ourport->port.dev, "Unable to get desc for Tx\n"); - return -EIO; - } - - dma->tx_desc->callback = s3c24xx_serial_tx_dma_complete; - dma->tx_desc->callback_param = ourport; - dma->tx_bytes_requested = dma->tx_size; - - ourport->tx_in_progress = S3C24XX_TX_DMA; - dma->tx_cookie = dmaengine_submit(dma->tx_desc); - dma_async_issue_pending(dma->tx_chan); - return 0; -} - -static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport) -{ - struct uart_port *port = &ourport->port; - struct circ_buf *xmit = &port->state->xmit; - unsigned long count; - - /* Get data size up to the end of buffer */ - count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); - - if (!count) { - s3c24xx_serial_stop_tx(port); - return; - } - - if (!ourport->dma || !ourport->dma->tx_chan || - count < ourport->min_dma_size || - xmit->tail & (dma_get_cache_alignment() - 1)) - s3c24xx_serial_start_tx_pio(ourport); - else - s3c24xx_serial_start_tx_dma(ourport, count); -} - -static void s3c24xx_serial_start_tx(struct uart_port *port) -{ - struct s3c24xx_uart_port *ourport = to_ourport(port); - struct circ_buf *xmit = &port->state->xmit; - - if (!tx_enabled(port)) { - if (port->flags & UPF_CONS_FLOW) - s3c24xx_serial_rx_disable(port); - - tx_enabled(port) = 1; - if (!ourport->dma || !ourport->dma->tx_chan) - s3c24xx_serial_start_tx_pio(ourport); - } - - if (ourport->dma && ourport->dma->tx_chan) { - if (!uart_circ_empty(xmit) && !ourport->tx_in_progress) - s3c24xx_serial_start_next_tx(ourport); - } -} - -static void s3c24xx_uart_copy_rx_to_tty(struct s3c24xx_uart_port *ourport, - struct tty_port *tty, int count) -{ - struct s3c24xx_uart_dma *dma = ourport->dma; - int copied; - - if (!count) - return; - - dma_sync_single_for_cpu(ourport->port.dev, dma->rx_addr, - dma->rx_size, DMA_FROM_DEVICE); - - ourport->port.icount.rx += count; - if (!tty) { - dev_err(ourport->port.dev, "No tty port\n"); - return; - } - copied = tty_insert_flip_string(tty, - ((unsigned char *)(ourport->dma->rx_buf)), count); - if (copied != count) { - WARN_ON(1); - dev_err(ourport->port.dev, "RxData copy to tty layer failed\n"); - } -} - -static void s3c24xx_serial_stop_rx(struct uart_port *port) -{ - struct s3c24xx_uart_port *ourport = to_ourport(port); - struct s3c24xx_uart_dma *dma = ourport->dma; - struct tty_port *t = &port->state->port; - struct dma_tx_state state; - enum dma_status dma_status; - unsigned int received; - - if (rx_enabled(port)) { - dbg("s3c24xx_serial_stop_rx: port=%p\n", port); - if (s3c24xx_serial_has_interrupt_mask(port)) - s3c24xx_set_bit(port, S3C64XX_UINTM_RXD, - S3C64XX_UINTM); - else - disable_irq_nosync(ourport->rx_irq); - rx_enabled(port) = 0; - } - if (dma && dma->rx_chan) { - dmaengine_pause(dma->tx_chan); - dma_status = dmaengine_tx_status(dma->rx_chan, - dma->rx_cookie, &state); - if (dma_status == DMA_IN_PROGRESS || - dma_status == DMA_PAUSED) { - received = dma->rx_bytes_requested - state.residue; - dmaengine_terminate_all(dma->rx_chan); - s3c24xx_uart_copy_rx_to_tty(ourport, t, received); - } - } -} - -static inline struct s3c24xx_uart_info - *s3c24xx_port_to_info(struct uart_port *port) -{ - return to_ourport(port)->info; -} - -static inline struct s3c2410_uartcfg - *s3c24xx_port_to_cfg(struct uart_port *port) -{ - struct s3c24xx_uart_port *ourport; - - if (port->dev == NULL) - return NULL; - - ourport = container_of(port, struct s3c24xx_uart_port, port); - return ourport->cfg; -} - -static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport, - unsigned long ufstat) -{ - struct s3c24xx_uart_info *info = ourport->info; - - if (ufstat & info->rx_fifofull) - return ourport->port.fifosize; - - return (ufstat & info->rx_fifomask) >> info->rx_fifoshift; -} - -static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport); -static void s3c24xx_serial_rx_dma_complete(void *args) -{ - struct s3c24xx_uart_port *ourport = args; - struct uart_port *port = &ourport->port; - - struct s3c24xx_uart_dma *dma = ourport->dma; - struct tty_port *t = &port->state->port; - struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port); - - struct dma_tx_state state; - unsigned long flags; - int received; - - dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state); - received = dma->rx_bytes_requested - state.residue; - async_tx_ack(dma->rx_desc); - - spin_lock_irqsave(&port->lock, flags); - - if (received) - s3c24xx_uart_copy_rx_to_tty(ourport, t, received); - - if (tty) { - tty_flip_buffer_push(t); - tty_kref_put(tty); - } - - s3c64xx_start_rx_dma(ourport); - - spin_unlock_irqrestore(&port->lock, flags); -} - -static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport) -{ - struct s3c24xx_uart_dma *dma = ourport->dma; - - dma_sync_single_for_device(ourport->port.dev, dma->rx_addr, - dma->rx_size, DMA_FROM_DEVICE); - - dma->rx_desc = dmaengine_prep_slave_single(dma->rx_chan, - dma->rx_addr, dma->rx_size, DMA_DEV_TO_MEM, - DMA_PREP_INTERRUPT); - if (!dma->rx_desc) { - dev_err(ourport->port.dev, "Unable to get desc for Rx\n"); - return; - } - - dma->rx_desc->callback = s3c24xx_serial_rx_dma_complete; - dma->rx_desc->callback_param = ourport; - dma->rx_bytes_requested = dma->rx_size; - - dma->rx_cookie = dmaengine_submit(dma->rx_desc); - dma_async_issue_pending(dma->rx_chan); -} - -/* ? - where has parity gone?? */ -#define S3C2410_UERSTAT_PARITY (0x1000) - -static void enable_rx_dma(struct s3c24xx_uart_port *ourport) -{ - struct uart_port *port = &ourport->port; - unsigned int ucon; - - /* set Rx mode to DMA mode */ - ucon = rd_regl(port, S3C2410_UCON); - ucon &= ~(S3C64XX_UCON_RXBURST_MASK | - S3C64XX_UCON_TIMEOUT_MASK | - S3C64XX_UCON_EMPTYINT_EN | - S3C64XX_UCON_DMASUS_EN | - S3C64XX_UCON_TIMEOUT_EN | - S3C64XX_UCON_RXMODE_MASK); - ucon |= S3C64XX_UCON_RXBURST_16 | - 0xf << S3C64XX_UCON_TIMEOUT_SHIFT | - S3C64XX_UCON_EMPTYINT_EN | - S3C64XX_UCON_TIMEOUT_EN | - S3C64XX_UCON_RXMODE_DMA; - wr_regl(port, S3C2410_UCON, ucon); - - ourport->rx_mode = S3C24XX_RX_DMA; -} - -static void enable_rx_pio(struct s3c24xx_uart_port *ourport) -{ - struct uart_port *port = &ourport->port; - unsigned int ucon; - - /* set Rx mode to DMA mode */ - ucon = rd_regl(port, S3C2410_UCON); - ucon &= ~(S3C64XX_UCON_TIMEOUT_MASK | - S3C64XX_UCON_EMPTYINT_EN | - S3C64XX_UCON_DMASUS_EN | - S3C64XX_UCON_TIMEOUT_EN | - S3C64XX_UCON_RXMODE_MASK); - ucon |= 0xf << S3C64XX_UCON_TIMEOUT_SHIFT | - S3C64XX_UCON_TIMEOUT_EN | - S3C64XX_UCON_RXMODE_CPU; - wr_regl(port, S3C2410_UCON, ucon); - - ourport->rx_mode = S3C24XX_RX_PIO; -} - -static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport); - -static irqreturn_t s3c24xx_serial_rx_chars_dma(void *dev_id) -{ - unsigned int utrstat, ufstat, received; - struct s3c24xx_uart_port *ourport = dev_id; - struct uart_port *port = &ourport->port; - struct s3c24xx_uart_dma *dma = ourport->dma; - struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port); - struct tty_port *t = &port->state->port; - unsigned long flags; - struct dma_tx_state state; - - utrstat = rd_regl(port, S3C2410_UTRSTAT); - ufstat = rd_regl(port, S3C2410_UFSTAT); - - spin_lock_irqsave(&port->lock, flags); - - if (!(utrstat & S3C2410_UTRSTAT_TIMEOUT)) { - s3c64xx_start_rx_dma(ourport); - if (ourport->rx_mode == S3C24XX_RX_PIO) - enable_rx_dma(ourport); - goto finish; - } - - if (ourport->rx_mode == S3C24XX_RX_DMA) { - dmaengine_pause(dma->rx_chan); - dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state); - dmaengine_terminate_all(dma->rx_chan); - received = dma->rx_bytes_requested - state.residue; - s3c24xx_uart_copy_rx_to_tty(ourport, t, received); - - enable_rx_pio(ourport); - } - - s3c24xx_serial_rx_drain_fifo(ourport); - - if (tty) { - tty_flip_buffer_push(t); - tty_kref_put(tty); - } - - wr_regl(port, S3C2410_UTRSTAT, S3C2410_UTRSTAT_TIMEOUT); - -finish: - spin_unlock_irqrestore(&port->lock, flags); - - return IRQ_HANDLED; -} - -static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport) -{ - struct uart_port *port = &ourport->port; - unsigned int ufcon, ch, flag, ufstat, uerstat; - unsigned int fifocnt = 0; - int max_count = port->fifosize; - - while (max_count-- > 0) { - /* - * Receive all characters known to be in FIFO - * before reading FIFO level again - */ - if (fifocnt == 0) { - ufstat = rd_regl(port, S3C2410_UFSTAT); - fifocnt = s3c24xx_serial_rx_fifocnt(ourport, ufstat); - if (fifocnt == 0) - break; - } - fifocnt--; - - uerstat = rd_regl(port, S3C2410_UERSTAT); - ch = rd_regb(port, S3C2410_URXH); - - if (port->flags & UPF_CONS_FLOW) { - int txe = s3c24xx_serial_txempty_nofifo(port); - - if (rx_enabled(port)) { - if (!txe) { - rx_enabled(port) = 0; - continue; - } - } else { - if (txe) { - ufcon = rd_regl(port, S3C2410_UFCON); - ufcon |= S3C2410_UFCON_RESETRX; - wr_regl(port, S3C2410_UFCON, ufcon); - rx_enabled(port) = 1; - return; - } - continue; - } - } - - /* insert the character into the buffer */ - - flag = TTY_NORMAL; - port->icount.rx++; - - if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) { - dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n", - ch, uerstat); - - /* check for break */ - if (uerstat & S3C2410_UERSTAT_BREAK) { - dbg("break!\n"); - port->icount.brk++; - if (uart_handle_break(port)) - continue; /* Ignore character */ - } - - if (uerstat & S3C2410_UERSTAT_FRAME) - port->icount.frame++; - if (uerstat & S3C2410_UERSTAT_OVERRUN) - port->icount.overrun++; - - uerstat &= port->read_status_mask; - - if (uerstat & S3C2410_UERSTAT_BREAK) - flag = TTY_BREAK; - else if (uerstat & S3C2410_UERSTAT_PARITY) - flag = TTY_PARITY; - else if (uerstat & (S3C2410_UERSTAT_FRAME | - S3C2410_UERSTAT_OVERRUN)) - flag = TTY_FRAME; - } - - if (uart_handle_sysrq_char(port, ch)) - continue; /* Ignore character */ - - uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN, - ch, flag); - } - - tty_flip_buffer_push(&port->state->port); -} - -static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id) -{ - struct s3c24xx_uart_port *ourport = dev_id; - struct uart_port *port = &ourport->port; - unsigned long flags; - - spin_lock_irqsave(&port->lock, flags); - s3c24xx_serial_rx_drain_fifo(ourport); - spin_unlock_irqrestore(&port->lock, flags); - - return IRQ_HANDLED; -} - - -static irqreturn_t s3c24xx_serial_rx_chars(int irq, void *dev_id) -{ - struct s3c24xx_uart_port *ourport = dev_id; - - if (ourport->dma && ourport->dma->rx_chan) - return s3c24xx_serial_rx_chars_dma(dev_id); - return s3c24xx_serial_rx_chars_pio(dev_id); -} - -static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id) -{ - struct s3c24xx_uart_port *ourport = id; - struct uart_port *port = &ourport->port; - struct circ_buf *xmit = &port->state->xmit; - unsigned long flags; - int count, dma_count = 0; - - spin_lock_irqsave(&port->lock, flags); - - count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); - - if (ourport->dma && ourport->dma->tx_chan && - count >= ourport->min_dma_size) { - int align = dma_get_cache_alignment() - - (xmit->tail & (dma_get_cache_alignment() - 1)); - if (count-align >= ourport->min_dma_size) { - dma_count = count-align; - count = align; - } - } - - if (port->x_char) { - wr_regb(port, S3C2410_UTXH, port->x_char); - port->icount.tx++; - port->x_char = 0; - goto out; - } - - /* if there isn't anything more to transmit, or the uart is now - * stopped, disable the uart and exit - */ - - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { - s3c24xx_serial_stop_tx(port); - goto out; - } - - /* try and drain the buffer... */ - - if (count > port->fifosize) { - count = port->fifosize; - dma_count = 0; - } - - while (!uart_circ_empty(xmit) && count > 0) { - if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull) - break; - - wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]); - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - port->icount.tx++; - count--; - } - - if (!count && dma_count) { - s3c24xx_serial_start_tx_dma(ourport, dma_count); - goto out; - } - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) { - spin_unlock(&port->lock); - uart_write_wakeup(port); - spin_lock(&port->lock); - } - - if (uart_circ_empty(xmit)) - s3c24xx_serial_stop_tx(port); - -out: - spin_unlock_irqrestore(&port->lock, flags); - return IRQ_HANDLED; -} - -/* interrupt handler for s3c64xx and later SoC's.*/ -static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id) -{ - struct s3c24xx_uart_port *ourport = id; - struct uart_port *port = &ourport->port; - unsigned int pend = rd_regl(port, S3C64XX_UINTP); - irqreturn_t ret = IRQ_HANDLED; - - if (pend & S3C64XX_UINTM_RXD_MSK) { - ret = s3c24xx_serial_rx_chars(irq, id); - wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_RXD_MSK); - } - if (pend & S3C64XX_UINTM_TXD_MSK) { - ret = s3c24xx_serial_tx_chars(irq, id); - wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_TXD_MSK); - } - return ret; -} - -static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port) -{ - struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); - unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT); - unsigned long ufcon = rd_regl(port, S3C2410_UFCON); - - if (ufcon & S3C2410_UFCON_FIFOMODE) { - if ((ufstat & info->tx_fifomask) != 0 || - (ufstat & info->tx_fifofull)) - return 0; - - return 1; - } - - return s3c24xx_serial_txempty_nofifo(port); -} - -/* no modem control lines */ -static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port) -{ - unsigned int umstat = rd_regb(port, S3C2410_UMSTAT); - - if (umstat & S3C2410_UMSTAT_CTS) - return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; - else - return TIOCM_CAR | TIOCM_DSR; -} - -static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) -{ - unsigned int umcon = rd_regl(port, S3C2410_UMCON); - - if (mctrl & TIOCM_RTS) - umcon |= S3C2410_UMCOM_RTS_LOW; - else - umcon &= ~S3C2410_UMCOM_RTS_LOW; - - wr_regl(port, S3C2410_UMCON, umcon); -} - -static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state) -{ - unsigned long flags; - unsigned int ucon; - - spin_lock_irqsave(&port->lock, flags); - - ucon = rd_regl(port, S3C2410_UCON); - - if (break_state) - ucon |= S3C2410_UCON_SBREAK; - else - ucon &= ~S3C2410_UCON_SBREAK; - - wr_regl(port, S3C2410_UCON, ucon); - - spin_unlock_irqrestore(&port->lock, flags); -} - -static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p) -{ - struct s3c24xx_uart_dma *dma = p->dma; - struct dma_slave_caps dma_caps; - const char *reason = NULL; - int ret; - - /* Default slave configuration parameters */ - dma->rx_conf.direction = DMA_DEV_TO_MEM; - dma->rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; - dma->rx_conf.src_addr = p->port.mapbase + S3C2410_URXH; - dma->rx_conf.src_maxburst = 1; - - dma->tx_conf.direction = DMA_MEM_TO_DEV; - dma->tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; - dma->tx_conf.dst_addr = p->port.mapbase + S3C2410_UTXH; - dma->tx_conf.dst_maxburst = 1; - - dma->rx_chan = dma_request_chan(p->port.dev, "rx"); - - if (IS_ERR(dma->rx_chan)) { - reason = "DMA RX channel request failed"; - ret = PTR_ERR(dma->rx_chan); - goto err_warn; - } - - ret = dma_get_slave_caps(dma->rx_chan, &dma_caps); - if (ret < 0 || - dma_caps.residue_granularity < DMA_RESIDUE_GRANULARITY_BURST) { - reason = "insufficient DMA RX engine capabilities"; - ret = -EOPNOTSUPP; - goto err_release_rx; - } - - dmaengine_slave_config(dma->rx_chan, &dma->rx_conf); - - dma->tx_chan = dma_request_chan(p->port.dev, "tx"); - if (IS_ERR(dma->tx_chan)) { - reason = "DMA TX channel request failed"; - ret = PTR_ERR(dma->tx_chan); - goto err_release_rx; - } - - ret = dma_get_slave_caps(dma->tx_chan, &dma_caps); - if (ret < 0 || - dma_caps.residue_granularity < DMA_RESIDUE_GRANULARITY_BURST) { - reason = "insufficient DMA TX engine capabilities"; - ret = -EOPNOTSUPP; - goto err_release_tx; - } - - dmaengine_slave_config(dma->tx_chan, &dma->tx_conf); - - /* RX buffer */ - dma->rx_size = PAGE_SIZE; - - dma->rx_buf = kmalloc(dma->rx_size, GFP_KERNEL); - if (!dma->rx_buf) { - ret = -ENOMEM; - goto err_release_tx; - } - - dma->rx_addr = dma_map_single(p->port.dev, dma->rx_buf, - dma->rx_size, DMA_FROM_DEVICE); - if (dma_mapping_error(p->port.dev, dma->rx_addr)) { - reason = "DMA mapping error for RX buffer"; - ret = -EIO; - goto err_free_rx; - } - - /* TX buffer */ - dma->tx_addr = dma_map_single(p->port.dev, p->port.state->xmit.buf, - UART_XMIT_SIZE, DMA_TO_DEVICE); - if (dma_mapping_error(p->port.dev, dma->tx_addr)) { - reason = "DMA mapping error for TX buffer"; - ret = -EIO; - goto err_unmap_rx; - } - - return 0; - -err_unmap_rx: - dma_unmap_single(p->port.dev, dma->rx_addr, dma->rx_size, - DMA_FROM_DEVICE); -err_free_rx: - kfree(dma->rx_buf); -err_release_tx: - dma_release_channel(dma->tx_chan); -err_release_rx: - dma_release_channel(dma->rx_chan); -err_warn: - if (reason) - dev_warn(p->port.dev, "%s, DMA will not be used\n", reason); - return ret; -} - -static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p) -{ - struct s3c24xx_uart_dma *dma = p->dma; - - if (dma->rx_chan) { - dmaengine_terminate_all(dma->rx_chan); - dma_unmap_single(p->port.dev, dma->rx_addr, - dma->rx_size, DMA_FROM_DEVICE); - kfree(dma->rx_buf); - dma_release_channel(dma->rx_chan); - dma->rx_chan = NULL; - } - - if (dma->tx_chan) { - dmaengine_terminate_all(dma->tx_chan); - dma_unmap_single(p->port.dev, dma->tx_addr, - UART_XMIT_SIZE, DMA_TO_DEVICE); - dma_release_channel(dma->tx_chan); - dma->tx_chan = NULL; - } -} - -static void s3c24xx_serial_shutdown(struct uart_port *port) -{ - struct s3c24xx_uart_port *ourport = to_ourport(port); - - if (ourport->tx_claimed) { - if (!s3c24xx_serial_has_interrupt_mask(port)) - free_irq(ourport->tx_irq, ourport); - tx_enabled(port) = 0; - ourport->tx_claimed = 0; - ourport->tx_mode = 0; - } - - if (ourport->rx_claimed) { - if (!s3c24xx_serial_has_interrupt_mask(port)) - free_irq(ourport->rx_irq, ourport); - ourport->rx_claimed = 0; - rx_enabled(port) = 0; - } - - /* Clear pending interrupts and mask all interrupts */ - if (s3c24xx_serial_has_interrupt_mask(port)) { - free_irq(port->irq, ourport); - - wr_regl(port, S3C64XX_UINTP, 0xf); - wr_regl(port, S3C64XX_UINTM, 0xf); - } - - if (ourport->dma) - s3c24xx_serial_release_dma(ourport); - - ourport->tx_in_progress = 0; -} - -static int s3c24xx_serial_startup(struct uart_port *port) -{ - struct s3c24xx_uart_port *ourport = to_ourport(port); - int ret; - - dbg("s3c24xx_serial_startup: port=%p (%08llx,%p)\n", - port, (unsigned long long)port->mapbase, port->membase); - - rx_enabled(port) = 1; - - ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0, - s3c24xx_serial_portname(port), ourport); - - if (ret != 0) { - dev_err(port->dev, "cannot get irq %d\n", ourport->rx_irq); - return ret; - } - - ourport->rx_claimed = 1; - - dbg("requesting tx irq...\n"); - - tx_enabled(port) = 1; - - ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0, - s3c24xx_serial_portname(port), ourport); - - if (ret) { - dev_err(port->dev, "cannot get irq %d\n", ourport->tx_irq); - goto err; - } - - ourport->tx_claimed = 1; - - dbg("s3c24xx_serial_startup ok\n"); - - /* the port reset code should have done the correct - * register setup for the port controls */ - - return ret; - -err: - s3c24xx_serial_shutdown(port); - return ret; -} - -static int s3c64xx_serial_startup(struct uart_port *port) -{ - struct s3c24xx_uart_port *ourport = to_ourport(port); - unsigned long flags; - unsigned int ufcon; - int ret; - - dbg("s3c64xx_serial_startup: port=%p (%08llx,%p)\n", - port, (unsigned long long)port->mapbase, port->membase); - - wr_regl(port, S3C64XX_UINTM, 0xf); - if (ourport->dma) { - ret = s3c24xx_serial_request_dma(ourport); - if (ret < 0) { - devm_kfree(port->dev, ourport->dma); - ourport->dma = NULL; - } - } - - ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED, - s3c24xx_serial_portname(port), ourport); - if (ret) { - dev_err(port->dev, "cannot get irq %d\n", port->irq); - return ret; - } - - /* For compatibility with s3c24xx Soc's */ - rx_enabled(port) = 1; - ourport->rx_claimed = 1; - tx_enabled(port) = 0; - ourport->tx_claimed = 1; - - spin_lock_irqsave(&port->lock, flags); - - ufcon = rd_regl(port, S3C2410_UFCON); - ufcon |= S3C2410_UFCON_RESETRX | S5PV210_UFCON_RXTRIG8; - if (!uart_console(port)) - ufcon |= S3C2410_UFCON_RESETTX; - wr_regl(port, S3C2410_UFCON, ufcon); - - enable_rx_pio(ourport); - - spin_unlock_irqrestore(&port->lock, flags); - - /* Enable Rx Interrupt */ - s3c24xx_clear_bit(port, S3C64XX_UINTM_RXD, S3C64XX_UINTM); - - dbg("s3c64xx_serial_startup ok\n"); - return ret; -} - -/* power power management control */ - -static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level, - unsigned int old) -{ - struct s3c24xx_uart_port *ourport = to_ourport(port); - int timeout = 10000; - - ourport->pm_level = level; - - switch (level) { - case 3: - while (--timeout && !s3c24xx_serial_txempty_nofifo(port)) - udelay(100); - - if (!IS_ERR(ourport->baudclk)) - clk_disable_unprepare(ourport->baudclk); - - clk_disable_unprepare(ourport->clk); - break; - - case 0: - clk_prepare_enable(ourport->clk); - - if (!IS_ERR(ourport->baudclk)) - clk_prepare_enable(ourport->baudclk); - - break; - default: - dev_err(port->dev, "s3c24xx_serial: unknown pm %d\n", level); - } -} - -/* baud rate calculation - * - * The UARTs on the S3C2410/S3C2440 can take their clocks from a number - * of different sources, including the peripheral clock ("pclk") and an - * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk") - * with a programmable extra divisor. - * - * The following code goes through the clock sources, and calculates the - * baud clocks (and the resultant actual baud rates) and then tries to - * pick the closest one and select that. - * -*/ - -#define MAX_CLK_NAME_LENGTH 15 - -static inline int s3c24xx_serial_getsource(struct uart_port *port) -{ - struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); - unsigned int ucon; - - if (info->num_clks == 1) - return 0; - - ucon = rd_regl(port, S3C2410_UCON); - ucon &= info->clksel_mask; - return ucon >> info->clksel_shift; -} - -static void s3c24xx_serial_setsource(struct uart_port *port, - unsigned int clk_sel) -{ - struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); - unsigned int ucon; - - if (info->num_clks == 1) - return; - - ucon = rd_regl(port, S3C2410_UCON); - if ((ucon & info->clksel_mask) >> info->clksel_shift == clk_sel) - return; - - ucon &= ~info->clksel_mask; - ucon |= clk_sel << info->clksel_shift; - wr_regl(port, S3C2410_UCON, ucon); -} - -static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport, - unsigned int req_baud, struct clk **best_clk, - unsigned int *clk_num) -{ - struct s3c24xx_uart_info *info = ourport->info; - struct clk *clk; - unsigned long rate; - unsigned int cnt, baud, quot, clk_sel, best_quot = 0; - char clkname[MAX_CLK_NAME_LENGTH]; - int calc_deviation, deviation = (1 << 30) - 1; - - clk_sel = (ourport->cfg->clk_sel) ? ourport->cfg->clk_sel : - ourport->info->def_clk_sel; - for (cnt = 0; cnt < info->num_clks; cnt++) { - if (!(clk_sel & (1 << cnt))) - continue; - - sprintf(clkname, "clk_uart_baud%d", cnt); - clk = clk_get(ourport->port.dev, clkname); - if (IS_ERR(clk)) - continue; - - rate = clk_get_rate(clk); - if (!rate) - continue; - - if (ourport->info->has_divslot) { - unsigned long div = rate / req_baud; - - /* The UDIVSLOT register on the newer UARTs allows us to - * get a divisor adjustment of 1/16th on the baud clock. - * - * We don't keep the UDIVSLOT value (the 16ths we - * calculated by not multiplying the baud by 16) as it - * is easy enough to recalculate. - */ - - quot = div / 16; - baud = rate / div; - } else { - quot = (rate + (8 * req_baud)) / (16 * req_baud); - baud = rate / (quot * 16); - } - quot--; - - calc_deviation = req_baud - baud; - if (calc_deviation < 0) - calc_deviation = -calc_deviation; - - if (calc_deviation < deviation) { - *best_clk = clk; - best_quot = quot; - *clk_num = cnt; - deviation = calc_deviation; - } - } - - return best_quot; -} - -/* udivslot_table[] - * - * This table takes the fractional value of the baud divisor and gives - * the recommended setting for the UDIVSLOT register. - */ -static u16 udivslot_table[16] = { - [0] = 0x0000, - [1] = 0x0080, - [2] = 0x0808, - [3] = 0x0888, - [4] = 0x2222, - [5] = 0x4924, - [6] = 0x4A52, - [7] = 0x54AA, - [8] = 0x5555, - [9] = 0xD555, - [10] = 0xD5D5, - [11] = 0xDDD5, - [12] = 0xDDDD, - [13] = 0xDFDD, - [14] = 0xDFDF, - [15] = 0xFFDF, -}; - -static void s3c24xx_serial_set_termios(struct uart_port *port, - struct ktermios *termios, - struct ktermios *old) -{ - struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port); - struct s3c24xx_uart_port *ourport = to_ourport(port); - struct clk *clk = ERR_PTR(-EINVAL); - unsigned long flags; - unsigned int baud, quot, clk_sel = 0; - unsigned int ulcon; - unsigned int umcon; - unsigned int udivslot = 0; - - /* - * We don't support modem control lines. - */ - termios->c_cflag &= ~(HUPCL | CMSPAR); - termios->c_cflag |= CLOCAL; - - /* - * Ask the core to calculate the divisor for us. - */ - - baud = uart_get_baud_rate(port, termios, old, 0, 3000000); - quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel); - if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) - quot = port->custom_divisor; - if (IS_ERR(clk)) - return; - - /* check to see if we need to change clock source */ - - if (ourport->baudclk != clk) { - clk_prepare_enable(clk); - - s3c24xx_serial_setsource(port, clk_sel); - - if (!IS_ERR(ourport->baudclk)) { - clk_disable_unprepare(ourport->baudclk); - ourport->baudclk = ERR_PTR(-EINVAL); - } - - ourport->baudclk = clk; - ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0; - } - - if (ourport->info->has_divslot) { - unsigned int div = ourport->baudclk_rate / baud; - - if (cfg->has_fracval) { - udivslot = (div & 15); - dbg("fracval = %04x\n", udivslot); - } else { - udivslot = udivslot_table[div & 15]; - dbg("udivslot = %04x (div %d)\n", udivslot, div & 15); - } - } - - switch (termios->c_cflag & CSIZE) { - case CS5: - dbg("config: 5bits/char\n"); - ulcon = S3C2410_LCON_CS5; - break; - case CS6: - dbg("config: 6bits/char\n"); - ulcon = S3C2410_LCON_CS6; - break; - case CS7: - dbg("config: 7bits/char\n"); - ulcon = S3C2410_LCON_CS7; - break; - case CS8: - default: - dbg("config: 8bits/char\n"); - ulcon = S3C2410_LCON_CS8; - break; - } - - /* preserve original lcon IR settings */ - ulcon |= (cfg->ulcon & S3C2410_LCON_IRM); - - if (termios->c_cflag & CSTOPB) - ulcon |= S3C2410_LCON_STOPB; - - if (termios->c_cflag & PARENB) { - if (termios->c_cflag & PARODD) - ulcon |= S3C2410_LCON_PODD; - else - ulcon |= S3C2410_LCON_PEVEN; - } else { - ulcon |= S3C2410_LCON_PNONE; - } - - spin_lock_irqsave(&port->lock, flags); - - dbg("setting ulcon to %08x, brddiv to %d, udivslot %08x\n", - ulcon, quot, udivslot); - - wr_regl(port, S3C2410_ULCON, ulcon); - wr_regl(port, S3C2410_UBRDIV, quot); - - port->status &= ~UPSTAT_AUTOCTS; - - umcon = rd_regl(port, S3C2410_UMCON); - if (termios->c_cflag & CRTSCTS) { - umcon |= S3C2410_UMCOM_AFC; - /* Disable RTS when RX FIFO contains 63 bytes */ - umcon &= ~S3C2412_UMCON_AFC_8; - port->status = UPSTAT_AUTOCTS; - } else { - umcon &= ~S3C2410_UMCOM_AFC; - } - wr_regl(port, S3C2410_UMCON, umcon); - - if (ourport->info->has_divslot) - wr_regl(port, S3C2443_DIVSLOT, udivslot); - - dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n", - rd_regl(port, S3C2410_ULCON), - rd_regl(port, S3C2410_UCON), - rd_regl(port, S3C2410_UFCON)); - - /* - * Update the per-port timeout. - */ - uart_update_timeout(port, termios->c_cflag, baud); - - /* - * Which character status flags are we interested in? - */ - port->read_status_mask = S3C2410_UERSTAT_OVERRUN; - if (termios->c_iflag & INPCK) - port->read_status_mask |= S3C2410_UERSTAT_FRAME | - S3C2410_UERSTAT_PARITY; - /* - * Which character status flags should we ignore? - */ - port->ignore_status_mask = 0; - if (termios->c_iflag & IGNPAR) - port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN; - if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR) - port->ignore_status_mask |= S3C2410_UERSTAT_FRAME; - - /* - * Ignore all characters if CREAD is not set. - */ - if ((termios->c_cflag & CREAD) == 0) - port->ignore_status_mask |= RXSTAT_DUMMY_READ; - - spin_unlock_irqrestore(&port->lock, flags); -} - -static const char *s3c24xx_serial_type(struct uart_port *port) -{ - switch (port->type) { - case PORT_S3C2410: - return "S3C2410"; - case PORT_S3C2440: - return "S3C2440"; - case PORT_S3C2412: - return "S3C2412"; - case PORT_S3C6400: - return "S3C6400/10"; - default: - return NULL; - } -} - -#define MAP_SIZE (0x100) - -static void s3c24xx_serial_release_port(struct uart_port *port) -{ - release_mem_region(port->mapbase, MAP_SIZE); -} - -static int s3c24xx_serial_request_port(struct uart_port *port) -{ - const char *name = s3c24xx_serial_portname(port); - return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY; -} - -static void s3c24xx_serial_config_port(struct uart_port *port, int flags) -{ - struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); - - if (flags & UART_CONFIG_TYPE && - s3c24xx_serial_request_port(port) == 0) - port->type = info->type; -} - -/* - * verify the new serial_struct (for TIOCSSERIAL). - */ -static int -s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser) -{ - struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); - - if (ser->type != PORT_UNKNOWN && ser->type != info->type) - return -EINVAL; - - return 0; -} - - -#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE - -static struct console s3c24xx_serial_console; - -static int __init s3c24xx_serial_console_init(void) -{ - register_console(&s3c24xx_serial_console); - return 0; -} -console_initcall(s3c24xx_serial_console_init); - -#define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console -#else -#define S3C24XX_SERIAL_CONSOLE NULL -#endif - -#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL) -static int s3c24xx_serial_get_poll_char(struct uart_port *port); -static void s3c24xx_serial_put_poll_char(struct uart_port *port, - unsigned char c); -#endif - -static struct uart_ops s3c24xx_serial_ops = { - .pm = s3c24xx_serial_pm, - .tx_empty = s3c24xx_serial_tx_empty, - .get_mctrl = s3c24xx_serial_get_mctrl, - .set_mctrl = s3c24xx_serial_set_mctrl, - .stop_tx = s3c24xx_serial_stop_tx, - .start_tx = s3c24xx_serial_start_tx, - .stop_rx = s3c24xx_serial_stop_rx, - .break_ctl = s3c24xx_serial_break_ctl, - .startup = s3c24xx_serial_startup, - .shutdown = s3c24xx_serial_shutdown, - .set_termios = s3c24xx_serial_set_termios, - .type = s3c24xx_serial_type, - .release_port = s3c24xx_serial_release_port, - .request_port = s3c24xx_serial_request_port, - .config_port = s3c24xx_serial_config_port, - .verify_port = s3c24xx_serial_verify_port, -#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL) - .poll_get_char = s3c24xx_serial_get_poll_char, - .poll_put_char = s3c24xx_serial_put_poll_char, -#endif -}; - -static struct uart_driver s3c24xx_uart_drv = { - .owner = THIS_MODULE, - .driver_name = "s3c2410_serial", - .nr = CONFIG_SERIAL_SAMSUNG_UARTS, - .cons = S3C24XX_SERIAL_CONSOLE, - .dev_name = S3C24XX_SERIAL_NAME, - .major = S3C24XX_SERIAL_MAJOR, - .minor = S3C24XX_SERIAL_MINOR, -}; - -#define __PORT_LOCK_UNLOCKED(i) \ - __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[i].port.lock) -static struct s3c24xx_uart_port -s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = { - [0] = { - .port = { - .lock = __PORT_LOCK_UNLOCKED(0), - .iotype = UPIO_MEM, - .uartclk = 0, - .fifosize = 16, - .ops = &s3c24xx_serial_ops, - .flags = UPF_BOOT_AUTOCONF, - .line = 0, - } - }, - [1] = { - .port = { - .lock = __PORT_LOCK_UNLOCKED(1), - .iotype = UPIO_MEM, - .uartclk = 0, - .fifosize = 16, - .ops = &s3c24xx_serial_ops, - .flags = UPF_BOOT_AUTOCONF, - .line = 1, - } - }, -#if CONFIG_SERIAL_SAMSUNG_UARTS > 2 - - [2] = { - .port = { - .lock = __PORT_LOCK_UNLOCKED(2), - .iotype = UPIO_MEM, - .uartclk = 0, - .fifosize = 16, - .ops = &s3c24xx_serial_ops, - .flags = UPF_BOOT_AUTOCONF, - .line = 2, - } - }, -#endif -#if CONFIG_SERIAL_SAMSUNG_UARTS > 3 - [3] = { - .port = { - .lock = __PORT_LOCK_UNLOCKED(3), - .iotype = UPIO_MEM, - .uartclk = 0, - .fifosize = 16, - .ops = &s3c24xx_serial_ops, - .flags = UPF_BOOT_AUTOCONF, - .line = 3, - } - } -#endif -}; -#undef __PORT_LOCK_UNLOCKED - -/* s3c24xx_serial_resetport - * - * reset the fifos and other the settings. -*/ - -static void s3c24xx_serial_resetport(struct uart_port *port, - struct s3c2410_uartcfg *cfg) -{ - struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); - unsigned long ucon = rd_regl(port, S3C2410_UCON); - unsigned int ucon_mask; - - ucon_mask = info->clksel_mask; - if (info->type == PORT_S3C2440) - ucon_mask |= S3C2440_UCON0_DIVMASK; - - ucon &= ucon_mask; - wr_regl(port, S3C2410_UCON, ucon | cfg->ucon); - - /* reset both fifos */ - wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH); - wr_regl(port, S3C2410_UFCON, cfg->ufcon); - - /* some delay is required after fifo reset */ - udelay(1); -} - - -#ifdef CONFIG_ARM_S3C24XX_CPUFREQ - -static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb, - unsigned long val, void *data) -{ - struct s3c24xx_uart_port *port; - struct uart_port *uport; - - port = container_of(nb, struct s3c24xx_uart_port, freq_transition); - uport = &port->port; - - /* check to see if port is enabled */ - - if (port->pm_level != 0) - return 0; - - /* try and work out if the baudrate is changing, we can detect - * a change in rate, but we do not have support for detecting - * a disturbance in the clock-rate over the change. - */ - - if (IS_ERR(port->baudclk)) - goto exit; - - if (port->baudclk_rate == clk_get_rate(port->baudclk)) - goto exit; - - if (val == CPUFREQ_PRECHANGE) { - /* we should really shut the port down whilst the - * frequency change is in progress. */ - - } else if (val == CPUFREQ_POSTCHANGE) { - struct ktermios *termios; - struct tty_struct *tty; - - if (uport->state == NULL) - goto exit; - - tty = uport->state->port.tty; - - if (tty == NULL) - goto exit; - - termios = &tty->termios; - - if (termios == NULL) { - dev_warn(uport->dev, "%s: no termios?\n", __func__); - goto exit; - } - - s3c24xx_serial_set_termios(uport, termios, NULL); - } - -exit: - return 0; -} - -static inline int -s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port) -{ - port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition; - - return cpufreq_register_notifier(&port->freq_transition, - CPUFREQ_TRANSITION_NOTIFIER); -} - -static inline void -s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port) -{ - cpufreq_unregister_notifier(&port->freq_transition, - CPUFREQ_TRANSITION_NOTIFIER); -} - -#else -static inline int -s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port) -{ - return 0; -} - -static inline void -s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port) -{ -} -#endif - -static int s3c24xx_serial_enable_baudclk(struct s3c24xx_uart_port *ourport) -{ - struct device *dev = ourport->port.dev; - struct s3c24xx_uart_info *info = ourport->info; - char clk_name[MAX_CLK_NAME_LENGTH]; - unsigned int clk_sel; - struct clk *clk; - int clk_num; - int ret; - - clk_sel = ourport->cfg->clk_sel ? : info->def_clk_sel; - for (clk_num = 0; clk_num < info->num_clks; clk_num++) { - if (!(clk_sel & (1 << clk_num))) - continue; - - sprintf(clk_name, "clk_uart_baud%d", clk_num); - clk = clk_get(dev, clk_name); - if (IS_ERR(clk)) - continue; - - ret = clk_prepare_enable(clk); - if (ret) { - clk_put(clk); - continue; - } - - ourport->baudclk = clk; - ourport->baudclk_rate = clk_get_rate(clk); - s3c24xx_serial_setsource(&ourport->port, clk_num); - - return 0; - } - - return -EINVAL; -} - -/* s3c24xx_serial_init_port - * - * initialise a single serial port from the platform device given - */ - -static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport, - struct platform_device *platdev) -{ - struct uart_port *port = &ourport->port; - struct s3c2410_uartcfg *cfg = ourport->cfg; - struct resource *res; - int ret; - - dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev); - - if (platdev == NULL) - return -ENODEV; - - if (port->mapbase != 0) - return -EINVAL; - - /* setup info for port */ - port->dev = &platdev->dev; - - /* Startup sequence is different for s3c64xx and higher SoC's */ - if (s3c24xx_serial_has_interrupt_mask(port)) - s3c24xx_serial_ops.startup = s3c64xx_serial_startup; - - port->uartclk = 1; - - if (cfg->uart_flags & UPF_CONS_FLOW) { - dbg("s3c24xx_serial_init_port: enabling flow control\n"); - port->flags |= UPF_CONS_FLOW; - } - - /* sort our the physical and virtual addresses for each UART */ - - res = platform_get_resource(platdev, IORESOURCE_MEM, 0); - if (res == NULL) { - dev_err(port->dev, "failed to find memory resource for uart\n"); - return -EINVAL; - } - - dbg("resource %pR)\n", res); - - port->membase = devm_ioremap(port->dev, res->start, resource_size(res)); - if (!port->membase) { - dev_err(port->dev, "failed to remap controller address\n"); - return -EBUSY; - } - - port->mapbase = res->start; - ret = platform_get_irq(platdev, 0); - if (ret < 0) - port->irq = 0; - else { - port->irq = ret; - ourport->rx_irq = ret; - ourport->tx_irq = ret + 1; - } - - ret = platform_get_irq(platdev, 1); - if (ret > 0) - ourport->tx_irq = ret; - /* - * DMA is currently supported only on DT platforms, if DMA properties - * are specified. - */ - if (platdev->dev.of_node && of_find_property(platdev->dev.of_node, - "dmas", NULL)) { - ourport->dma = devm_kzalloc(port->dev, - sizeof(*ourport->dma), - GFP_KERNEL); - if (!ourport->dma) { - ret = -ENOMEM; - goto err; - } - } - - ourport->clk = clk_get(&platdev->dev, "uart"); - if (IS_ERR(ourport->clk)) { - pr_err("%s: Controller clock not found\n", - dev_name(&platdev->dev)); - ret = PTR_ERR(ourport->clk); - goto err; - } - - ret = clk_prepare_enable(ourport->clk); - if (ret) { - pr_err("uart: clock failed to prepare+enable: %d\n", ret); - clk_put(ourport->clk); - goto err; - } - - ret = s3c24xx_serial_enable_baudclk(ourport); - if (ret) - pr_warn("uart: failed to enable baudclk\n"); - - /* Keep all interrupts masked and cleared */ - if (s3c24xx_serial_has_interrupt_mask(port)) { - wr_regl(port, S3C64XX_UINTM, 0xf); - wr_regl(port, S3C64XX_UINTP, 0xf); - wr_regl(port, S3C64XX_UINTSP, 0xf); - } - - dbg("port: map=%pa, mem=%p, irq=%d (%d,%d), clock=%u\n", - &port->mapbase, port->membase, port->irq, - ourport->rx_irq, ourport->tx_irq, port->uartclk); - - /* reset the fifos (and setup the uart) */ - s3c24xx_serial_resetport(port, cfg); - - return 0; - -err: - port->mapbase = 0; - return ret; -} - -/* Device driver serial port probe */ - -static const struct of_device_id s3c24xx_uart_dt_match[]; -static int probe_index; - -static inline struct s3c24xx_serial_drv_data *s3c24xx_get_driver_data( - struct platform_device *pdev) -{ -#ifdef CONFIG_OF - if (pdev->dev.of_node) { - const struct of_device_id *match; - match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node); - return (struct s3c24xx_serial_drv_data *)match->data; - } -#endif - return (struct s3c24xx_serial_drv_data *) - platform_get_device_id(pdev)->driver_data; -} - -static int s3c24xx_serial_probe(struct platform_device *pdev) -{ - struct device_node *np = pdev->dev.of_node; - struct s3c24xx_uart_port *ourport; - int index = probe_index; - int ret; - - if (np) { - ret = of_alias_get_id(np, "serial"); - if (ret >= 0) - index = ret; - } - - dbg("s3c24xx_serial_probe(%p) %d\n", pdev, index); - - if (index >= ARRAY_SIZE(s3c24xx_serial_ports)) { - dev_err(&pdev->dev, "serial%d out of range\n", index); - return -EINVAL; - } - ourport = &s3c24xx_serial_ports[index]; - - ourport->drv_data = s3c24xx_get_driver_data(pdev); - if (!ourport->drv_data) { - dev_err(&pdev->dev, "could not find driver data\n"); - return -ENODEV; - } - - ourport->baudclk = ERR_PTR(-EINVAL); - ourport->info = ourport->drv_data->info; - ourport->cfg = (dev_get_platdata(&pdev->dev)) ? - dev_get_platdata(&pdev->dev) : - ourport->drv_data->def_cfg; - - if (np) - of_property_read_u32(np, - "samsung,uart-fifosize", &ourport->port.fifosize); - - if (ourport->drv_data->fifosize[index]) - ourport->port.fifosize = ourport->drv_data->fifosize[index]; - else if (ourport->info->fifosize) - ourport->port.fifosize = ourport->info->fifosize; - - /* - * DMA transfers must be aligned at least to cache line size, - * so find minimal transfer size suitable for DMA mode - */ - ourport->min_dma_size = max_t(int, ourport->port.fifosize, - dma_get_cache_alignment()); - - dbg("%s: initialising port %p...\n", __func__, ourport); - - ret = s3c24xx_serial_init_port(ourport, pdev); - if (ret < 0) - return ret; - - if (!s3c24xx_uart_drv.state) { - ret = uart_register_driver(&s3c24xx_uart_drv); - if (ret < 0) { - pr_err("Failed to register Samsung UART driver\n"); - return ret; - } - } - - dbg("%s: adding port\n", __func__); - uart_add_one_port(&s3c24xx_uart_drv, &ourport->port); - platform_set_drvdata(pdev, &ourport->port); - - /* - * Deactivate the clock enabled in s3c24xx_serial_init_port here, - * so that a potential re-enablement through the pm-callback overlaps - * and keeps the clock enabled in this case. - */ - clk_disable_unprepare(ourport->clk); - if (!IS_ERR(ourport->baudclk)) - clk_disable_unprepare(ourport->baudclk); - - ret = s3c24xx_serial_cpufreq_register(ourport); - if (ret < 0) - dev_err(&pdev->dev, "failed to add cpufreq notifier\n"); - - probe_index++; - - return 0; -} - -static int s3c24xx_serial_remove(struct platform_device *dev) -{ - struct uart_port *port = s3c24xx_dev_to_port(&dev->dev); - - if (port) { - s3c24xx_serial_cpufreq_deregister(to_ourport(port)); - uart_remove_one_port(&s3c24xx_uart_drv, port); - } - - uart_unregister_driver(&s3c24xx_uart_drv); - - return 0; -} - -/* UART power management code */ -#ifdef CONFIG_PM_SLEEP -static int s3c24xx_serial_suspend(struct device *dev) -{ - struct uart_port *port = s3c24xx_dev_to_port(dev); - - if (port) - uart_suspend_port(&s3c24xx_uart_drv, port); - - return 0; -} - -static int s3c24xx_serial_resume(struct device *dev) -{ - struct uart_port *port = s3c24xx_dev_to_port(dev); - struct s3c24xx_uart_port *ourport = to_ourport(port); - - if (port) { - clk_prepare_enable(ourport->clk); - if (!IS_ERR(ourport->baudclk)) - clk_prepare_enable(ourport->baudclk); - s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port)); - if (!IS_ERR(ourport->baudclk)) - clk_disable_unprepare(ourport->baudclk); - clk_disable_unprepare(ourport->clk); - - uart_resume_port(&s3c24xx_uart_drv, port); - } - - return 0; -} - -static int s3c24xx_serial_resume_noirq(struct device *dev) -{ - struct uart_port *port = s3c24xx_dev_to_port(dev); - struct s3c24xx_uart_port *ourport = to_ourport(port); - - if (port) { - /* restore IRQ mask */ - if (s3c24xx_serial_has_interrupt_mask(port)) { - unsigned int uintm = 0xf; - if (tx_enabled(port)) - uintm &= ~S3C64XX_UINTM_TXD_MSK; - if (rx_enabled(port)) - uintm &= ~S3C64XX_UINTM_RXD_MSK; - clk_prepare_enable(ourport->clk); - if (!IS_ERR(ourport->baudclk)) - clk_prepare_enable(ourport->baudclk); - wr_regl(port, S3C64XX_UINTM, uintm); - if (!IS_ERR(ourport->baudclk)) - clk_disable_unprepare(ourport->baudclk); - clk_disable_unprepare(ourport->clk); - } - } - - return 0; -} - -static const struct dev_pm_ops s3c24xx_serial_pm_ops = { - .suspend = s3c24xx_serial_suspend, - .resume = s3c24xx_serial_resume, - .resume_noirq = s3c24xx_serial_resume_noirq, -}; -#define SERIAL_SAMSUNG_PM_OPS (&s3c24xx_serial_pm_ops) - -#else /* !CONFIG_PM_SLEEP */ - -#define SERIAL_SAMSUNG_PM_OPS NULL -#endif /* CONFIG_PM_SLEEP */ - -/* Console code */ - -#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE - -static struct uart_port *cons_uart; - -static int -s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon) -{ - struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); - unsigned long ufstat, utrstat; - - if (ufcon & S3C2410_UFCON_FIFOMODE) { - /* fifo mode - check amount of data in fifo registers... */ - - ufstat = rd_regl(port, S3C2410_UFSTAT); - return (ufstat & info->tx_fifofull) ? 0 : 1; - } - - /* in non-fifo mode, we go and use the tx buffer empty */ - - utrstat = rd_regl(port, S3C2410_UTRSTAT); - return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0; -} - -static bool -s3c24xx_port_configured(unsigned int ucon) -{ - /* consider the serial port configured if the tx/rx mode set */ - return (ucon & 0xf) != 0; -} - -#ifdef CONFIG_CONSOLE_POLL -/* - * Console polling routines for writing and reading from the uart while - * in an interrupt or debug context. - */ - -static int s3c24xx_serial_get_poll_char(struct uart_port *port) -{ - struct s3c24xx_uart_port *ourport = to_ourport(port); - unsigned int ufstat; - - ufstat = rd_regl(port, S3C2410_UFSTAT); - if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0) - return NO_POLL_CHAR; - - return rd_regb(port, S3C2410_URXH); -} - -static void s3c24xx_serial_put_poll_char(struct uart_port *port, - unsigned char c) -{ - unsigned int ufcon = rd_regl(port, S3C2410_UFCON); - unsigned int ucon = rd_regl(port, S3C2410_UCON); - - /* not possible to xmit on unconfigured port */ - if (!s3c24xx_port_configured(ucon)) - return; - - while (!s3c24xx_serial_console_txrdy(port, ufcon)) - cpu_relax(); - wr_regb(port, S3C2410_UTXH, c); -} - -#endif /* CONFIG_CONSOLE_POLL */ - -static void -s3c24xx_serial_console_putchar(struct uart_port *port, int ch) -{ - unsigned int ufcon = rd_regl(port, S3C2410_UFCON); - - while (!s3c24xx_serial_console_txrdy(port, ufcon)) - cpu_relax(); - wr_regb(port, S3C2410_UTXH, ch); -} - -static void -s3c24xx_serial_console_write(struct console *co, const char *s, - unsigned int count) -{ - unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON); - - /* not possible to xmit on unconfigured port */ - if (!s3c24xx_port_configured(ucon)) - return; - - uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar); -} - -static void __init -s3c24xx_serial_get_options(struct uart_port *port, int *baud, - int *parity, int *bits) -{ - struct clk *clk; - unsigned int ulcon; - unsigned int ucon; - unsigned int ubrdiv; - unsigned long rate; - unsigned int clk_sel; - char clk_name[MAX_CLK_NAME_LENGTH]; - - ulcon = rd_regl(port, S3C2410_ULCON); - ucon = rd_regl(port, S3C2410_UCON); - ubrdiv = rd_regl(port, S3C2410_UBRDIV); - - dbg("s3c24xx_serial_get_options: port=%p\n" - "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n", - port, ulcon, ucon, ubrdiv); - - if (s3c24xx_port_configured(ucon)) { - switch (ulcon & S3C2410_LCON_CSMASK) { - case S3C2410_LCON_CS5: - *bits = 5; - break; - case S3C2410_LCON_CS6: - *bits = 6; - break; - case S3C2410_LCON_CS7: - *bits = 7; - break; - case S3C2410_LCON_CS8: - default: - *bits = 8; - break; - } - - switch (ulcon & S3C2410_LCON_PMASK) { - case S3C2410_LCON_PEVEN: - *parity = 'e'; - break; - - case S3C2410_LCON_PODD: - *parity = 'o'; - break; - - case S3C2410_LCON_PNONE: - default: - *parity = 'n'; - } - - /* now calculate the baud rate */ - - clk_sel = s3c24xx_serial_getsource(port); - sprintf(clk_name, "clk_uart_baud%d", clk_sel); - - clk = clk_get(port->dev, clk_name); - if (!IS_ERR(clk)) - rate = clk_get_rate(clk); - else - rate = 1; - - *baud = rate / (16 * (ubrdiv + 1)); - dbg("calculated baud %d\n", *baud); - } - -} - -static int __init -s3c24xx_serial_console_setup(struct console *co, char *options) -{ - struct uart_port *port; - int baud = 9600; - int bits = 8; - int parity = 'n'; - int flow = 'n'; - - dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n", - co, co->index, options); - - /* is this a valid port */ - - if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS) - co->index = 0; - - port = &s3c24xx_serial_ports[co->index].port; - - /* is the port configured? */ - - if (port->mapbase == 0x0) - return -ENODEV; - - cons_uart = port; - - dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index); - - /* - * Check whether an invalid uart number has been specified, and - * if so, search for the first available port that does have - * console support. - */ - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - else - s3c24xx_serial_get_options(port, &baud, &parity, &bits); - - dbg("s3c24xx_serial_console_setup: baud %d\n", baud); - - return uart_set_options(port, co, baud, parity, bits, flow); -} - -static struct console s3c24xx_serial_console = { - .name = S3C24XX_SERIAL_NAME, - .device = uart_console_device, - .flags = CON_PRINTBUFFER, - .index = -1, - .write = s3c24xx_serial_console_write, - .setup = s3c24xx_serial_console_setup, - .data = &s3c24xx_uart_drv, -}; -#endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */ - -#ifdef CONFIG_CPU_S3C2410 -static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = { - .info = &(struct s3c24xx_uart_info) { - .name = "Samsung S3C2410 UART", - .type = PORT_S3C2410, - .fifosize = 16, - .rx_fifomask = S3C2410_UFSTAT_RXMASK, - .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT, - .rx_fifofull = S3C2410_UFSTAT_RXFULL, - .tx_fifofull = S3C2410_UFSTAT_TXFULL, - .tx_fifomask = S3C2410_UFSTAT_TXMASK, - .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT, - .def_clk_sel = S3C2410_UCON_CLKSEL0, - .num_clks = 2, - .clksel_mask = S3C2410_UCON_CLKMASK, - .clksel_shift = S3C2410_UCON_CLKSHIFT, - }, - .def_cfg = &(struct s3c2410_uartcfg) { - .ucon = S3C2410_UCON_DEFAULT, - .ufcon = S3C2410_UFCON_DEFAULT, - }, -}; -#define S3C2410_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2410_serial_drv_data) -#else -#define S3C2410_SERIAL_DRV_DATA (kernel_ulong_t)NULL -#endif - -#ifdef CONFIG_CPU_S3C2412 -static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = { - .info = &(struct s3c24xx_uart_info) { - .name = "Samsung S3C2412 UART", - .type = PORT_S3C2412, - .fifosize = 64, - .has_divslot = 1, - .rx_fifomask = S3C2440_UFSTAT_RXMASK, - .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT, - .rx_fifofull = S3C2440_UFSTAT_RXFULL, - .tx_fifofull = S3C2440_UFSTAT_TXFULL, - .tx_fifomask = S3C2440_UFSTAT_TXMASK, - .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT, - .def_clk_sel = S3C2410_UCON_CLKSEL2, - .num_clks = 4, - .clksel_mask = S3C2412_UCON_CLKMASK, - .clksel_shift = S3C2412_UCON_CLKSHIFT, - }, - .def_cfg = &(struct s3c2410_uartcfg) { - .ucon = S3C2410_UCON_DEFAULT, - .ufcon = S3C2410_UFCON_DEFAULT, - }, -}; -#define S3C2412_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2412_serial_drv_data) -#else -#define S3C2412_SERIAL_DRV_DATA (kernel_ulong_t)NULL -#endif - -#if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2416) || \ - defined(CONFIG_CPU_S3C2443) || defined(CONFIG_CPU_S3C2442) -static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = { - .info = &(struct s3c24xx_uart_info) { - .name = "Samsung S3C2440 UART", - .type = PORT_S3C2440, - .fifosize = 64, - .has_divslot = 1, - .rx_fifomask = S3C2440_UFSTAT_RXMASK, - .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT, - .rx_fifofull = S3C2440_UFSTAT_RXFULL, - .tx_fifofull = S3C2440_UFSTAT_TXFULL, - .tx_fifomask = S3C2440_UFSTAT_TXMASK, - .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT, - .def_clk_sel = S3C2410_UCON_CLKSEL2, - .num_clks = 4, - .clksel_mask = S3C2412_UCON_CLKMASK, - .clksel_shift = S3C2412_UCON_CLKSHIFT, - }, - .def_cfg = &(struct s3c2410_uartcfg) { - .ucon = S3C2410_UCON_DEFAULT, - .ufcon = S3C2410_UFCON_DEFAULT, - }, -}; -#define S3C2440_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2440_serial_drv_data) -#else -#define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL -#endif - -#if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410) -static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = { - .info = &(struct s3c24xx_uart_info) { - .name = "Samsung S3C6400 UART", - .type = PORT_S3C6400, - .fifosize = 64, - .has_divslot = 1, - .rx_fifomask = S3C2440_UFSTAT_RXMASK, - .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT, - .rx_fifofull = S3C2440_UFSTAT_RXFULL, - .tx_fifofull = S3C2440_UFSTAT_TXFULL, - .tx_fifomask = S3C2440_UFSTAT_TXMASK, - .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT, - .def_clk_sel = S3C2410_UCON_CLKSEL2, - .num_clks = 4, - .clksel_mask = S3C6400_UCON_CLKMASK, - .clksel_shift = S3C6400_UCON_CLKSHIFT, - }, - .def_cfg = &(struct s3c2410_uartcfg) { - .ucon = S3C2410_UCON_DEFAULT, - .ufcon = S3C2410_UFCON_DEFAULT, - }, -}; -#define S3C6400_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c6400_serial_drv_data) -#else -#define S3C6400_SERIAL_DRV_DATA (kernel_ulong_t)NULL -#endif - -#ifdef CONFIG_CPU_S5PV210 -static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = { - .info = &(struct s3c24xx_uart_info) { - .name = "Samsung S5PV210 UART", - .type = PORT_S3C6400, - .has_divslot = 1, - .rx_fifomask = S5PV210_UFSTAT_RXMASK, - .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, - .rx_fifofull = S5PV210_UFSTAT_RXFULL, - .tx_fifofull = S5PV210_UFSTAT_TXFULL, - .tx_fifomask = S5PV210_UFSTAT_TXMASK, - .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT, - .def_clk_sel = S3C2410_UCON_CLKSEL0, - .num_clks = 2, - .clksel_mask = S5PV210_UCON_CLKMASK, - .clksel_shift = S5PV210_UCON_CLKSHIFT, - }, - .def_cfg = &(struct s3c2410_uartcfg) { - .ucon = S5PV210_UCON_DEFAULT, - .ufcon = S5PV210_UFCON_DEFAULT, - }, - .fifosize = { 256, 64, 16, 16 }, -}; -#define S5PV210_SERIAL_DRV_DATA ((kernel_ulong_t)&s5pv210_serial_drv_data) -#else -#define S5PV210_SERIAL_DRV_DATA (kernel_ulong_t)NULL -#endif - -#if defined(CONFIG_ARCH_EXYNOS) -#define EXYNOS_COMMON_SERIAL_DRV_DATA \ - .info = &(struct s3c24xx_uart_info) { \ - .name = "Samsung Exynos UART", \ - .type = PORT_S3C6400, \ - .has_divslot = 1, \ - .rx_fifomask = S5PV210_UFSTAT_RXMASK, \ - .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, \ - .rx_fifofull = S5PV210_UFSTAT_RXFULL, \ - .tx_fifofull = S5PV210_UFSTAT_TXFULL, \ - .tx_fifomask = S5PV210_UFSTAT_TXMASK, \ - .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT, \ - .def_clk_sel = S3C2410_UCON_CLKSEL0, \ - .num_clks = 1, \ - .clksel_mask = 0, \ - .clksel_shift = 0, \ - }, \ - .def_cfg = &(struct s3c2410_uartcfg) { \ - .ucon = S5PV210_UCON_DEFAULT, \ - .ufcon = S5PV210_UFCON_DEFAULT, \ - .has_fracval = 1, \ - } \ - -static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = { - EXYNOS_COMMON_SERIAL_DRV_DATA, - .fifosize = { 256, 64, 16, 16 }, -}; - -static struct s3c24xx_serial_drv_data exynos5433_serial_drv_data = { - EXYNOS_COMMON_SERIAL_DRV_DATA, - .fifosize = { 64, 256, 16, 256 }, -}; - -#define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data) -#define EXYNOS5433_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos5433_serial_drv_data) -#else -#define EXYNOS4210_SERIAL_DRV_DATA (kernel_ulong_t)NULL -#define EXYNOS5433_SERIAL_DRV_DATA (kernel_ulong_t)NULL -#endif - -static const struct platform_device_id s3c24xx_serial_driver_ids[] = { - { - .name = "s3c2410-uart", - .driver_data = S3C2410_SERIAL_DRV_DATA, - }, { - .name = "s3c2412-uart", - .driver_data = S3C2412_SERIAL_DRV_DATA, - }, { - .name = "s3c2440-uart", - .driver_data = S3C2440_SERIAL_DRV_DATA, - }, { - .name = "s3c6400-uart", - .driver_data = S3C6400_SERIAL_DRV_DATA, - }, { - .name = "s5pv210-uart", - .driver_data = S5PV210_SERIAL_DRV_DATA, - }, { - .name = "exynos4210-uart", - .driver_data = EXYNOS4210_SERIAL_DRV_DATA, - }, { - .name = "exynos5433-uart", - .driver_data = EXYNOS5433_SERIAL_DRV_DATA, - }, - { }, -}; -MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids); - -#ifdef CONFIG_OF -static const struct of_device_id s3c24xx_uart_dt_match[] = { - { .compatible = "samsung,s3c2410-uart", - .data = (void *)S3C2410_SERIAL_DRV_DATA }, - { .compatible = "samsung,s3c2412-uart", - .data = (void *)S3C2412_SERIAL_DRV_DATA }, - { .compatible = "samsung,s3c2440-uart", - .data = (void *)S3C2440_SERIAL_DRV_DATA }, - { .compatible = "samsung,s3c6400-uart", - .data = (void *)S3C6400_SERIAL_DRV_DATA }, - { .compatible = "samsung,s5pv210-uart", - .data = (void *)S5PV210_SERIAL_DRV_DATA }, - { .compatible = "samsung,exynos4210-uart", - .data = (void *)EXYNOS4210_SERIAL_DRV_DATA }, - { .compatible = "samsung,exynos5433-uart", - .data = (void *)EXYNOS5433_SERIAL_DRV_DATA }, - {}, -}; -MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match); -#endif - -static struct platform_driver samsung_serial_driver = { - .probe = s3c24xx_serial_probe, - .remove = s3c24xx_serial_remove, - .id_table = s3c24xx_serial_driver_ids, - .driver = { - .name = "samsung-uart", - .pm = SERIAL_SAMSUNG_PM_OPS, - .of_match_table = of_match_ptr(s3c24xx_uart_dt_match), - }, -}; - -module_platform_driver(samsung_serial_driver); - -#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE -/* - * Early console. - */ - -struct samsung_early_console_data { - u32 txfull_mask; -}; - -static void samsung_early_busyuart(struct uart_port *port) -{ - while (!(readl(port->membase + S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXFE)) - ; -} - -static void samsung_early_busyuart_fifo(struct uart_port *port) -{ - struct samsung_early_console_data *data = port->private_data; - - while (readl(port->membase + S3C2410_UFSTAT) & data->txfull_mask) - ; -} - -static void samsung_early_putc(struct uart_port *port, int c) -{ - if (readl(port->membase + S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE) - samsung_early_busyuart_fifo(port); - else - samsung_early_busyuart(port); - - writeb(c, port->membase + S3C2410_UTXH); -} - -static void samsung_early_write(struct console *con, const char *s, unsigned n) -{ - struct earlycon_device *dev = con->data; - - uart_console_write(&dev->port, s, n, samsung_early_putc); -} - -static int __init samsung_early_console_setup(struct earlycon_device *device, - const char *opt) -{ - if (!device->port.membase) - return -ENODEV; - - device->con->write = samsung_early_write; - return 0; -} - -/* S3C2410 */ -static struct samsung_early_console_data s3c2410_early_console_data = { - .txfull_mask = S3C2410_UFSTAT_TXFULL, -}; - -static int __init s3c2410_early_console_setup(struct earlycon_device *device, - const char *opt) -{ - device->port.private_data = &s3c2410_early_console_data; - return samsung_early_console_setup(device, opt); -} -OF_EARLYCON_DECLARE(s3c2410, "samsung,s3c2410-uart", - s3c2410_early_console_setup); - -/* S3C2412, S3C2440, S3C64xx */ -static struct samsung_early_console_data s3c2440_early_console_data = { - .txfull_mask = S3C2440_UFSTAT_TXFULL, -}; - -static int __init s3c2440_early_console_setup(struct earlycon_device *device, - const char *opt) -{ - device->port.private_data = &s3c2440_early_console_data; - return samsung_early_console_setup(device, opt); -} -OF_EARLYCON_DECLARE(s3c2412, "samsung,s3c2412-uart", - s3c2440_early_console_setup); -OF_EARLYCON_DECLARE(s3c2440, "samsung,s3c2440-uart", - s3c2440_early_console_setup); -OF_EARLYCON_DECLARE(s3c6400, "samsung,s3c6400-uart", - s3c2440_early_console_setup); - -/* S5PV210, EXYNOS */ -static struct samsung_early_console_data s5pv210_early_console_data = { - .txfull_mask = S5PV210_UFSTAT_TXFULL, -}; - -static int __init s5pv210_early_console_setup(struct earlycon_device *device, - const char *opt) -{ - device->port.private_data = &s5pv210_early_console_data; - return samsung_early_console_setup(device, opt); -} -OF_EARLYCON_DECLARE(s5pv210, "samsung,s5pv210-uart", - s5pv210_early_console_setup); -OF_EARLYCON_DECLARE(exynos4210, "samsung,exynos4210-uart", - s5pv210_early_console_setup); -#endif - -MODULE_ALIAS("platform:samsung-uart"); -MODULE_DESCRIPTION("Samsung SoC Serial port driver"); -MODULE_AUTHOR("Ben Dooks "); -MODULE_LICENSE("GPL v2"); diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c new file mode 100644 index 000000000000..83fd51607741 --- /dev/null +++ b/drivers/tty/serial/samsung_tty.c @@ -0,0 +1,2595 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver core for Samsung SoC onboard UARTs. + * + * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics + * http://armlinux.simtec.co.uk/ +*/ + +/* Hote on 2410 error handling + * + * The s3c2410 manual has a love/hate affair with the contents of the + * UERSTAT register in the UART blocks, and keeps marking some of the + * error bits as reserved. Having checked with the s3c2410x01, + * it copes with BREAKs properly, so I am happy to ignore the RESERVED + * feature from the latter versions of the manual. + * + * If it becomes aparrent that latter versions of the 2410 remove these + * bits, then action will have to be taken to differentiate the versions + * and change the policy on BREAK + * + * BJD, 04-Nov-2004 +*/ + +#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) +#define SUPPORT_SYSRQ +#endif + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "samsung.h" + +#if defined(CONFIG_SERIAL_SAMSUNG_DEBUG) && \ + !defined(MODULE) + +extern void printascii(const char *); + +__printf(1, 2) +static void dbg(const char *fmt, ...) +{ + va_list va; + char buff[256]; + + va_start(va, fmt); + vscnprintf(buff, sizeof(buff), fmt, va); + va_end(va); + + printascii(buff); +} + +#else +#define dbg(fmt, ...) do { if (0) no_printk(fmt, ##__VA_ARGS__); } while (0) +#endif + +/* UART name and device definitions */ + +#define S3C24XX_SERIAL_NAME "ttySAC" +#define S3C24XX_SERIAL_MAJOR 204 +#define S3C24XX_SERIAL_MINOR 64 + +#define S3C24XX_TX_PIO 1 +#define S3C24XX_TX_DMA 2 +#define S3C24XX_RX_PIO 1 +#define S3C24XX_RX_DMA 2 +/* macros to change one thing to another */ + +#define tx_enabled(port) ((port)->unused[0]) +#define rx_enabled(port) ((port)->unused[1]) + +/* flag to ignore all characters coming in */ +#define RXSTAT_DUMMY_READ (0x10000000) + +static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port) +{ + return container_of(port, struct s3c24xx_uart_port, port); +} + +/* translate a port to the device name */ + +static inline const char *s3c24xx_serial_portname(struct uart_port *port) +{ + return to_platform_device(port->dev)->name; +} + +static int s3c24xx_serial_txempty_nofifo(struct uart_port *port) +{ + return rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE; +} + +/* + * s3c64xx and later SoC's include the interrupt mask and status registers in + * the controller itself, unlike the s3c24xx SoC's which have these registers + * in the interrupt controller. Check if the port type is s3c64xx or higher. + */ +static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port) +{ + return to_ourport(port)->info->type == PORT_S3C6400; +} + +static void s3c24xx_serial_rx_enable(struct uart_port *port) +{ + unsigned long flags; + unsigned int ucon, ufcon; + int count = 10000; + + spin_lock_irqsave(&port->lock, flags); + + while (--count && !s3c24xx_serial_txempty_nofifo(port)) + udelay(100); + + ufcon = rd_regl(port, S3C2410_UFCON); + ufcon |= S3C2410_UFCON_RESETRX; + wr_regl(port, S3C2410_UFCON, ufcon); + + ucon = rd_regl(port, S3C2410_UCON); + ucon |= S3C2410_UCON_RXIRQMODE; + wr_regl(port, S3C2410_UCON, ucon); + + rx_enabled(port) = 1; + spin_unlock_irqrestore(&port->lock, flags); +} + +static void s3c24xx_serial_rx_disable(struct uart_port *port) +{ + unsigned long flags; + unsigned int ucon; + + spin_lock_irqsave(&port->lock, flags); + + ucon = rd_regl(port, S3C2410_UCON); + ucon &= ~S3C2410_UCON_RXIRQMODE; + wr_regl(port, S3C2410_UCON, ucon); + + rx_enabled(port) = 0; + spin_unlock_irqrestore(&port->lock, flags); +} + +static void s3c24xx_serial_stop_tx(struct uart_port *port) +{ + struct s3c24xx_uart_port *ourport = to_ourport(port); + struct s3c24xx_uart_dma *dma = ourport->dma; + struct circ_buf *xmit = &port->state->xmit; + struct dma_tx_state state; + int count; + + if (!tx_enabled(port)) + return; + + if (s3c24xx_serial_has_interrupt_mask(port)) + s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM); + else + disable_irq_nosync(ourport->tx_irq); + + if (dma && dma->tx_chan && ourport->tx_in_progress == S3C24XX_TX_DMA) { + dmaengine_pause(dma->tx_chan); + dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state); + dmaengine_terminate_all(dma->tx_chan); + dma_sync_single_for_cpu(ourport->port.dev, + dma->tx_transfer_addr, dma->tx_size, DMA_TO_DEVICE); + async_tx_ack(dma->tx_desc); + count = dma->tx_bytes_requested - state.residue; + xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1); + port->icount.tx += count; + } + + tx_enabled(port) = 0; + ourport->tx_in_progress = 0; + + if (port->flags & UPF_CONS_FLOW) + s3c24xx_serial_rx_enable(port); + + ourport->tx_mode = 0; +} + +static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport); + +static void s3c24xx_serial_tx_dma_complete(void *args) +{ + struct s3c24xx_uart_port *ourport = args; + struct uart_port *port = &ourport->port; + struct circ_buf *xmit = &port->state->xmit; + struct s3c24xx_uart_dma *dma = ourport->dma; + struct dma_tx_state state; + unsigned long flags; + int count; + + + dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state); + count = dma->tx_bytes_requested - state.residue; + async_tx_ack(dma->tx_desc); + + dma_sync_single_for_cpu(ourport->port.dev, dma->tx_transfer_addr, + dma->tx_size, DMA_TO_DEVICE); + + spin_lock_irqsave(&port->lock, flags); + + xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1); + port->icount.tx += count; + ourport->tx_in_progress = 0; + + if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + uart_write_wakeup(port); + + s3c24xx_serial_start_next_tx(ourport); + spin_unlock_irqrestore(&port->lock, flags); +} + +static void enable_tx_dma(struct s3c24xx_uart_port *ourport) +{ + struct uart_port *port = &ourport->port; + u32 ucon; + + /* Mask Tx interrupt */ + if (s3c24xx_serial_has_interrupt_mask(port)) + s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM); + else + disable_irq_nosync(ourport->tx_irq); + + /* Enable tx dma mode */ + ucon = rd_regl(port, S3C2410_UCON); + ucon &= ~(S3C64XX_UCON_TXBURST_MASK | S3C64XX_UCON_TXMODE_MASK); + ucon |= (dma_get_cache_alignment() >= 16) ? + S3C64XX_UCON_TXBURST_16 : S3C64XX_UCON_TXBURST_1; + ucon |= S3C64XX_UCON_TXMODE_DMA; + wr_regl(port, S3C2410_UCON, ucon); + + ourport->tx_mode = S3C24XX_TX_DMA; +} + +static void enable_tx_pio(struct s3c24xx_uart_port *ourport) +{ + struct uart_port *port = &ourport->port; + u32 ucon, ufcon; + + /* Set ufcon txtrig */ + ourport->tx_in_progress = S3C24XX_TX_PIO; + ufcon = rd_regl(port, S3C2410_UFCON); + wr_regl(port, S3C2410_UFCON, ufcon); + + /* Enable tx pio mode */ + ucon = rd_regl(port, S3C2410_UCON); + ucon &= ~(S3C64XX_UCON_TXMODE_MASK); + ucon |= S3C64XX_UCON_TXMODE_CPU; + wr_regl(port, S3C2410_UCON, ucon); + + /* Unmask Tx interrupt */ + if (s3c24xx_serial_has_interrupt_mask(port)) + s3c24xx_clear_bit(port, S3C64XX_UINTM_TXD, + S3C64XX_UINTM); + else + enable_irq(ourport->tx_irq); + + ourport->tx_mode = S3C24XX_TX_PIO; +} + +static void s3c24xx_serial_start_tx_pio(struct s3c24xx_uart_port *ourport) +{ + if (ourport->tx_mode != S3C24XX_TX_PIO) + enable_tx_pio(ourport); +} + +static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport, + unsigned int count) +{ + struct uart_port *port = &ourport->port; + struct circ_buf *xmit = &port->state->xmit; + struct s3c24xx_uart_dma *dma = ourport->dma; + + + if (ourport->tx_mode != S3C24XX_TX_DMA) + enable_tx_dma(ourport); + + dma->tx_size = count & ~(dma_get_cache_alignment() - 1); + dma->tx_transfer_addr = dma->tx_addr + xmit->tail; + + dma_sync_single_for_device(ourport->port.dev, dma->tx_transfer_addr, + dma->tx_size, DMA_TO_DEVICE); + + dma->tx_desc = dmaengine_prep_slave_single(dma->tx_chan, + dma->tx_transfer_addr, dma->tx_size, + DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT); + if (!dma->tx_desc) { + dev_err(ourport->port.dev, "Unable to get desc for Tx\n"); + return -EIO; + } + + dma->tx_desc->callback = s3c24xx_serial_tx_dma_complete; + dma->tx_desc->callback_param = ourport; + dma->tx_bytes_requested = dma->tx_size; + + ourport->tx_in_progress = S3C24XX_TX_DMA; + dma->tx_cookie = dmaengine_submit(dma->tx_desc); + dma_async_issue_pending(dma->tx_chan); + return 0; +} + +static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport) +{ + struct uart_port *port = &ourport->port; + struct circ_buf *xmit = &port->state->xmit; + unsigned long count; + + /* Get data size up to the end of buffer */ + count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); + + if (!count) { + s3c24xx_serial_stop_tx(port); + return; + } + + if (!ourport->dma || !ourport->dma->tx_chan || + count < ourport->min_dma_size || + xmit->tail & (dma_get_cache_alignment() - 1)) + s3c24xx_serial_start_tx_pio(ourport); + else + s3c24xx_serial_start_tx_dma(ourport, count); +} + +static void s3c24xx_serial_start_tx(struct uart_port *port) +{ + struct s3c24xx_uart_port *ourport = to_ourport(port); + struct circ_buf *xmit = &port->state->xmit; + + if (!tx_enabled(port)) { + if (port->flags & UPF_CONS_FLOW) + s3c24xx_serial_rx_disable(port); + + tx_enabled(port) = 1; + if (!ourport->dma || !ourport->dma->tx_chan) + s3c24xx_serial_start_tx_pio(ourport); + } + + if (ourport->dma && ourport->dma->tx_chan) { + if (!uart_circ_empty(xmit) && !ourport->tx_in_progress) + s3c24xx_serial_start_next_tx(ourport); + } +} + +static void s3c24xx_uart_copy_rx_to_tty(struct s3c24xx_uart_port *ourport, + struct tty_port *tty, int count) +{ + struct s3c24xx_uart_dma *dma = ourport->dma; + int copied; + + if (!count) + return; + + dma_sync_single_for_cpu(ourport->port.dev, dma->rx_addr, + dma->rx_size, DMA_FROM_DEVICE); + + ourport->port.icount.rx += count; + if (!tty) { + dev_err(ourport->port.dev, "No tty port\n"); + return; + } + copied = tty_insert_flip_string(tty, + ((unsigned char *)(ourport->dma->rx_buf)), count); + if (copied != count) { + WARN_ON(1); + dev_err(ourport->port.dev, "RxData copy to tty layer failed\n"); + } +} + +static void s3c24xx_serial_stop_rx(struct uart_port *port) +{ + struct s3c24xx_uart_port *ourport = to_ourport(port); + struct s3c24xx_uart_dma *dma = ourport->dma; + struct tty_port *t = &port->state->port; + struct dma_tx_state state; + enum dma_status dma_status; + unsigned int received; + + if (rx_enabled(port)) { + dbg("s3c24xx_serial_stop_rx: port=%p\n", port); + if (s3c24xx_serial_has_interrupt_mask(port)) + s3c24xx_set_bit(port, S3C64XX_UINTM_RXD, + S3C64XX_UINTM); + else + disable_irq_nosync(ourport->rx_irq); + rx_enabled(port) = 0; + } + if (dma && dma->rx_chan) { + dmaengine_pause(dma->tx_chan); + dma_status = dmaengine_tx_status(dma->rx_chan, + dma->rx_cookie, &state); + if (dma_status == DMA_IN_PROGRESS || + dma_status == DMA_PAUSED) { + received = dma->rx_bytes_requested - state.residue; + dmaengine_terminate_all(dma->rx_chan); + s3c24xx_uart_copy_rx_to_tty(ourport, t, received); + } + } +} + +static inline struct s3c24xx_uart_info + *s3c24xx_port_to_info(struct uart_port *port) +{ + return to_ourport(port)->info; +} + +static inline struct s3c2410_uartcfg + *s3c24xx_port_to_cfg(struct uart_port *port) +{ + struct s3c24xx_uart_port *ourport; + + if (port->dev == NULL) + return NULL; + + ourport = container_of(port, struct s3c24xx_uart_port, port); + return ourport->cfg; +} + +static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport, + unsigned long ufstat) +{ + struct s3c24xx_uart_info *info = ourport->info; + + if (ufstat & info->rx_fifofull) + return ourport->port.fifosize; + + return (ufstat & info->rx_fifomask) >> info->rx_fifoshift; +} + +static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport); +static void s3c24xx_serial_rx_dma_complete(void *args) +{ + struct s3c24xx_uart_port *ourport = args; + struct uart_port *port = &ourport->port; + + struct s3c24xx_uart_dma *dma = ourport->dma; + struct tty_port *t = &port->state->port; + struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port); + + struct dma_tx_state state; + unsigned long flags; + int received; + + dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state); + received = dma->rx_bytes_requested - state.residue; + async_tx_ack(dma->rx_desc); + + spin_lock_irqsave(&port->lock, flags); + + if (received) + s3c24xx_uart_copy_rx_to_tty(ourport, t, received); + + if (tty) { + tty_flip_buffer_push(t); + tty_kref_put(tty); + } + + s3c64xx_start_rx_dma(ourport); + + spin_unlock_irqrestore(&port->lock, flags); +} + +static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport) +{ + struct s3c24xx_uart_dma *dma = ourport->dma; + + dma_sync_single_for_device(ourport->port.dev, dma->rx_addr, + dma->rx_size, DMA_FROM_DEVICE); + + dma->rx_desc = dmaengine_prep_slave_single(dma->rx_chan, + dma->rx_addr, dma->rx_size, DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT); + if (!dma->rx_desc) { + dev_err(ourport->port.dev, "Unable to get desc for Rx\n"); + return; + } + + dma->rx_desc->callback = s3c24xx_serial_rx_dma_complete; + dma->rx_desc->callback_param = ourport; + dma->rx_bytes_requested = dma->rx_size; + + dma->rx_cookie = dmaengine_submit(dma->rx_desc); + dma_async_issue_pending(dma->rx_chan); +} + +/* ? - where has parity gone?? */ +#define S3C2410_UERSTAT_PARITY (0x1000) + +static void enable_rx_dma(struct s3c24xx_uart_port *ourport) +{ + struct uart_port *port = &ourport->port; + unsigned int ucon; + + /* set Rx mode to DMA mode */ + ucon = rd_regl(port, S3C2410_UCON); + ucon &= ~(S3C64XX_UCON_RXBURST_MASK | + S3C64XX_UCON_TIMEOUT_MASK | + S3C64XX_UCON_EMPTYINT_EN | + S3C64XX_UCON_DMASUS_EN | + S3C64XX_UCON_TIMEOUT_EN | + S3C64XX_UCON_RXMODE_MASK); + ucon |= S3C64XX_UCON_RXBURST_16 | + 0xf << S3C64XX_UCON_TIMEOUT_SHIFT | + S3C64XX_UCON_EMPTYINT_EN | + S3C64XX_UCON_TIMEOUT_EN | + S3C64XX_UCON_RXMODE_DMA; + wr_regl(port, S3C2410_UCON, ucon); + + ourport->rx_mode = S3C24XX_RX_DMA; +} + +static void enable_rx_pio(struct s3c24xx_uart_port *ourport) +{ + struct uart_port *port = &ourport->port; + unsigned int ucon; + + /* set Rx mode to DMA mode */ + ucon = rd_regl(port, S3C2410_UCON); + ucon &= ~(S3C64XX_UCON_TIMEOUT_MASK | + S3C64XX_UCON_EMPTYINT_EN | + S3C64XX_UCON_DMASUS_EN | + S3C64XX_UCON_TIMEOUT_EN | + S3C64XX_UCON_RXMODE_MASK); + ucon |= 0xf << S3C64XX_UCON_TIMEOUT_SHIFT | + S3C64XX_UCON_TIMEOUT_EN | + S3C64XX_UCON_RXMODE_CPU; + wr_regl(port, S3C2410_UCON, ucon); + + ourport->rx_mode = S3C24XX_RX_PIO; +} + +static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport); + +static irqreturn_t s3c24xx_serial_rx_chars_dma(void *dev_id) +{ + unsigned int utrstat, ufstat, received; + struct s3c24xx_uart_port *ourport = dev_id; + struct uart_port *port = &ourport->port; + struct s3c24xx_uart_dma *dma = ourport->dma; + struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port); + struct tty_port *t = &port->state->port; + unsigned long flags; + struct dma_tx_state state; + + utrstat = rd_regl(port, S3C2410_UTRSTAT); + ufstat = rd_regl(port, S3C2410_UFSTAT); + + spin_lock_irqsave(&port->lock, flags); + + if (!(utrstat & S3C2410_UTRSTAT_TIMEOUT)) { + s3c64xx_start_rx_dma(ourport); + if (ourport->rx_mode == S3C24XX_RX_PIO) + enable_rx_dma(ourport); + goto finish; + } + + if (ourport->rx_mode == S3C24XX_RX_DMA) { + dmaengine_pause(dma->rx_chan); + dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state); + dmaengine_terminate_all(dma->rx_chan); + received = dma->rx_bytes_requested - state.residue; + s3c24xx_uart_copy_rx_to_tty(ourport, t, received); + + enable_rx_pio(ourport); + } + + s3c24xx_serial_rx_drain_fifo(ourport); + + if (tty) { + tty_flip_buffer_push(t); + tty_kref_put(tty); + } + + wr_regl(port, S3C2410_UTRSTAT, S3C2410_UTRSTAT_TIMEOUT); + +finish: + spin_unlock_irqrestore(&port->lock, flags); + + return IRQ_HANDLED; +} + +static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport) +{ + struct uart_port *port = &ourport->port; + unsigned int ufcon, ch, flag, ufstat, uerstat; + unsigned int fifocnt = 0; + int max_count = port->fifosize; + + while (max_count-- > 0) { + /* + * Receive all characters known to be in FIFO + * before reading FIFO level again + */ + if (fifocnt == 0) { + ufstat = rd_regl(port, S3C2410_UFSTAT); + fifocnt = s3c24xx_serial_rx_fifocnt(ourport, ufstat); + if (fifocnt == 0) + break; + } + fifocnt--; + + uerstat = rd_regl(port, S3C2410_UERSTAT); + ch = rd_regb(port, S3C2410_URXH); + + if (port->flags & UPF_CONS_FLOW) { + int txe = s3c24xx_serial_txempty_nofifo(port); + + if (rx_enabled(port)) { + if (!txe) { + rx_enabled(port) = 0; + continue; + } + } else { + if (txe) { + ufcon = rd_regl(port, S3C2410_UFCON); + ufcon |= S3C2410_UFCON_RESETRX; + wr_regl(port, S3C2410_UFCON, ufcon); + rx_enabled(port) = 1; + return; + } + continue; + } + } + + /* insert the character into the buffer */ + + flag = TTY_NORMAL; + port->icount.rx++; + + if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) { + dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n", + ch, uerstat); + + /* check for break */ + if (uerstat & S3C2410_UERSTAT_BREAK) { + dbg("break!\n"); + port->icount.brk++; + if (uart_handle_break(port)) + continue; /* Ignore character */ + } + + if (uerstat & S3C2410_UERSTAT_FRAME) + port->icount.frame++; + if (uerstat & S3C2410_UERSTAT_OVERRUN) + port->icount.overrun++; + + uerstat &= port->read_status_mask; + + if (uerstat & S3C2410_UERSTAT_BREAK) + flag = TTY_BREAK; + else if (uerstat & S3C2410_UERSTAT_PARITY) + flag = TTY_PARITY; + else if (uerstat & (S3C2410_UERSTAT_FRAME | + S3C2410_UERSTAT_OVERRUN)) + flag = TTY_FRAME; + } + + if (uart_handle_sysrq_char(port, ch)) + continue; /* Ignore character */ + + uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN, + ch, flag); + } + + tty_flip_buffer_push(&port->state->port); +} + +static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id) +{ + struct s3c24xx_uart_port *ourport = dev_id; + struct uart_port *port = &ourport->port; + unsigned long flags; + + spin_lock_irqsave(&port->lock, flags); + s3c24xx_serial_rx_drain_fifo(ourport); + spin_unlock_irqrestore(&port->lock, flags); + + return IRQ_HANDLED; +} + + +static irqreturn_t s3c24xx_serial_rx_chars(int irq, void *dev_id) +{ + struct s3c24xx_uart_port *ourport = dev_id; + + if (ourport->dma && ourport->dma->rx_chan) + return s3c24xx_serial_rx_chars_dma(dev_id); + return s3c24xx_serial_rx_chars_pio(dev_id); +} + +static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id) +{ + struct s3c24xx_uart_port *ourport = id; + struct uart_port *port = &ourport->port; + struct circ_buf *xmit = &port->state->xmit; + unsigned long flags; + int count, dma_count = 0; + + spin_lock_irqsave(&port->lock, flags); + + count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); + + if (ourport->dma && ourport->dma->tx_chan && + count >= ourport->min_dma_size) { + int align = dma_get_cache_alignment() - + (xmit->tail & (dma_get_cache_alignment() - 1)); + if (count-align >= ourport->min_dma_size) { + dma_count = count-align; + count = align; + } + } + + if (port->x_char) { + wr_regb(port, S3C2410_UTXH, port->x_char); + port->icount.tx++; + port->x_char = 0; + goto out; + } + + /* if there isn't anything more to transmit, or the uart is now + * stopped, disable the uart and exit + */ + + if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { + s3c24xx_serial_stop_tx(port); + goto out; + } + + /* try and drain the buffer... */ + + if (count > port->fifosize) { + count = port->fifosize; + dma_count = 0; + } + + while (!uart_circ_empty(xmit) && count > 0) { + if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull) + break; + + wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]); + xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); + port->icount.tx++; + count--; + } + + if (!count && dma_count) { + s3c24xx_serial_start_tx_dma(ourport, dma_count); + goto out; + } + + if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) { + spin_unlock(&port->lock); + uart_write_wakeup(port); + spin_lock(&port->lock); + } + + if (uart_circ_empty(xmit)) + s3c24xx_serial_stop_tx(port); + +out: + spin_unlock_irqrestore(&port->lock, flags); + return IRQ_HANDLED; +} + +/* interrupt handler for s3c64xx and later SoC's.*/ +static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id) +{ + struct s3c24xx_uart_port *ourport = id; + struct uart_port *port = &ourport->port; + unsigned int pend = rd_regl(port, S3C64XX_UINTP); + irqreturn_t ret = IRQ_HANDLED; + + if (pend & S3C64XX_UINTM_RXD_MSK) { + ret = s3c24xx_serial_rx_chars(irq, id); + wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_RXD_MSK); + } + if (pend & S3C64XX_UINTM_TXD_MSK) { + ret = s3c24xx_serial_tx_chars(irq, id); + wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_TXD_MSK); + } + return ret; +} + +static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port) +{ + struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); + unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT); + unsigned long ufcon = rd_regl(port, S3C2410_UFCON); + + if (ufcon & S3C2410_UFCON_FIFOMODE) { + if ((ufstat & info->tx_fifomask) != 0 || + (ufstat & info->tx_fifofull)) + return 0; + + return 1; + } + + return s3c24xx_serial_txempty_nofifo(port); +} + +/* no modem control lines */ +static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port) +{ + unsigned int umstat = rd_regb(port, S3C2410_UMSTAT); + + if (umstat & S3C2410_UMSTAT_CTS) + return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; + else + return TIOCM_CAR | TIOCM_DSR; +} + +static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) +{ + unsigned int umcon = rd_regl(port, S3C2410_UMCON); + + if (mctrl & TIOCM_RTS) + umcon |= S3C2410_UMCOM_RTS_LOW; + else + umcon &= ~S3C2410_UMCOM_RTS_LOW; + + wr_regl(port, S3C2410_UMCON, umcon); +} + +static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state) +{ + unsigned long flags; + unsigned int ucon; + + spin_lock_irqsave(&port->lock, flags); + + ucon = rd_regl(port, S3C2410_UCON); + + if (break_state) + ucon |= S3C2410_UCON_SBREAK; + else + ucon &= ~S3C2410_UCON_SBREAK; + + wr_regl(port, S3C2410_UCON, ucon); + + spin_unlock_irqrestore(&port->lock, flags); +} + +static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p) +{ + struct s3c24xx_uart_dma *dma = p->dma; + struct dma_slave_caps dma_caps; + const char *reason = NULL; + int ret; + + /* Default slave configuration parameters */ + dma->rx_conf.direction = DMA_DEV_TO_MEM; + dma->rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; + dma->rx_conf.src_addr = p->port.mapbase + S3C2410_URXH; + dma->rx_conf.src_maxburst = 1; + + dma->tx_conf.direction = DMA_MEM_TO_DEV; + dma->tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; + dma->tx_conf.dst_addr = p->port.mapbase + S3C2410_UTXH; + dma->tx_conf.dst_maxburst = 1; + + dma->rx_chan = dma_request_chan(p->port.dev, "rx"); + + if (IS_ERR(dma->rx_chan)) { + reason = "DMA RX channel request failed"; + ret = PTR_ERR(dma->rx_chan); + goto err_warn; + } + + ret = dma_get_slave_caps(dma->rx_chan, &dma_caps); + if (ret < 0 || + dma_caps.residue_granularity < DMA_RESIDUE_GRANULARITY_BURST) { + reason = "insufficient DMA RX engine capabilities"; + ret = -EOPNOTSUPP; + goto err_release_rx; + } + + dmaengine_slave_config(dma->rx_chan, &dma->rx_conf); + + dma->tx_chan = dma_request_chan(p->port.dev, "tx"); + if (IS_ERR(dma->tx_chan)) { + reason = "DMA TX channel request failed"; + ret = PTR_ERR(dma->tx_chan); + goto err_release_rx; + } + + ret = dma_get_slave_caps(dma->tx_chan, &dma_caps); + if (ret < 0 || + dma_caps.residue_granularity < DMA_RESIDUE_GRANULARITY_BURST) { + reason = "insufficient DMA TX engine capabilities"; + ret = -EOPNOTSUPP; + goto err_release_tx; + } + + dmaengine_slave_config(dma->tx_chan, &dma->tx_conf); + + /* RX buffer */ + dma->rx_size = PAGE_SIZE; + + dma->rx_buf = kmalloc(dma->rx_size, GFP_KERNEL); + if (!dma->rx_buf) { + ret = -ENOMEM; + goto err_release_tx; + } + + dma->rx_addr = dma_map_single(p->port.dev, dma->rx_buf, + dma->rx_size, DMA_FROM_DEVICE); + if (dma_mapping_error(p->port.dev, dma->rx_addr)) { + reason = "DMA mapping error for RX buffer"; + ret = -EIO; + goto err_free_rx; + } + + /* TX buffer */ + dma->tx_addr = dma_map_single(p->port.dev, p->port.state->xmit.buf, + UART_XMIT_SIZE, DMA_TO_DEVICE); + if (dma_mapping_error(p->port.dev, dma->tx_addr)) { + reason = "DMA mapping error for TX buffer"; + ret = -EIO; + goto err_unmap_rx; + } + + return 0; + +err_unmap_rx: + dma_unmap_single(p->port.dev, dma->rx_addr, dma->rx_size, + DMA_FROM_DEVICE); +err_free_rx: + kfree(dma->rx_buf); +err_release_tx: + dma_release_channel(dma->tx_chan); +err_release_rx: + dma_release_channel(dma->rx_chan); +err_warn: + if (reason) + dev_warn(p->port.dev, "%s, DMA will not be used\n", reason); + return ret; +} + +static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p) +{ + struct s3c24xx_uart_dma *dma = p->dma; + + if (dma->rx_chan) { + dmaengine_terminate_all(dma->rx_chan); + dma_unmap_single(p->port.dev, dma->rx_addr, + dma->rx_size, DMA_FROM_DEVICE); + kfree(dma->rx_buf); + dma_release_channel(dma->rx_chan); + dma->rx_chan = NULL; + } + + if (dma->tx_chan) { + dmaengine_terminate_all(dma->tx_chan); + dma_unmap_single(p->port.dev, dma->tx_addr, + UART_XMIT_SIZE, DMA_TO_DEVICE); + dma_release_channel(dma->tx_chan); + dma->tx_chan = NULL; + } +} + +static void s3c24xx_serial_shutdown(struct uart_port *port) +{ + struct s3c24xx_uart_port *ourport = to_ourport(port); + + if (ourport->tx_claimed) { + if (!s3c24xx_serial_has_interrupt_mask(port)) + free_irq(ourport->tx_irq, ourport); + tx_enabled(port) = 0; + ourport->tx_claimed = 0; + ourport->tx_mode = 0; + } + + if (ourport->rx_claimed) { + if (!s3c24xx_serial_has_interrupt_mask(port)) + free_irq(ourport->rx_irq, ourport); + ourport->rx_claimed = 0; + rx_enabled(port) = 0; + } + + /* Clear pending interrupts and mask all interrupts */ + if (s3c24xx_serial_has_interrupt_mask(port)) { + free_irq(port->irq, ourport); + + wr_regl(port, S3C64XX_UINTP, 0xf); + wr_regl(port, S3C64XX_UINTM, 0xf); + } + + if (ourport->dma) + s3c24xx_serial_release_dma(ourport); + + ourport->tx_in_progress = 0; +} + +static int s3c24xx_serial_startup(struct uart_port *port) +{ + struct s3c24xx_uart_port *ourport = to_ourport(port); + int ret; + + dbg("s3c24xx_serial_startup: port=%p (%08llx,%p)\n", + port, (unsigned long long)port->mapbase, port->membase); + + rx_enabled(port) = 1; + + ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0, + s3c24xx_serial_portname(port), ourport); + + if (ret != 0) { + dev_err(port->dev, "cannot get irq %d\n", ourport->rx_irq); + return ret; + } + + ourport->rx_claimed = 1; + + dbg("requesting tx irq...\n"); + + tx_enabled(port) = 1; + + ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0, + s3c24xx_serial_portname(port), ourport); + + if (ret) { + dev_err(port->dev, "cannot get irq %d\n", ourport->tx_irq); + goto err; + } + + ourport->tx_claimed = 1; + + dbg("s3c24xx_serial_startup ok\n"); + + /* the port reset code should have done the correct + * register setup for the port controls */ + + return ret; + +err: + s3c24xx_serial_shutdown(port); + return ret; +} + +static int s3c64xx_serial_startup(struct uart_port *port) +{ + struct s3c24xx_uart_port *ourport = to_ourport(port); + unsigned long flags; + unsigned int ufcon; + int ret; + + dbg("s3c64xx_serial_startup: port=%p (%08llx,%p)\n", + port, (unsigned long long)port->mapbase, port->membase); + + wr_regl(port, S3C64XX_UINTM, 0xf); + if (ourport->dma) { + ret = s3c24xx_serial_request_dma(ourport); + if (ret < 0) { + devm_kfree(port->dev, ourport->dma); + ourport->dma = NULL; + } + } + + ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED, + s3c24xx_serial_portname(port), ourport); + if (ret) { + dev_err(port->dev, "cannot get irq %d\n", port->irq); + return ret; + } + + /* For compatibility with s3c24xx Soc's */ + rx_enabled(port) = 1; + ourport->rx_claimed = 1; + tx_enabled(port) = 0; + ourport->tx_claimed = 1; + + spin_lock_irqsave(&port->lock, flags); + + ufcon = rd_regl(port, S3C2410_UFCON); + ufcon |= S3C2410_UFCON_RESETRX | S5PV210_UFCON_RXTRIG8; + if (!uart_console(port)) + ufcon |= S3C2410_UFCON_RESETTX; + wr_regl(port, S3C2410_UFCON, ufcon); + + enable_rx_pio(ourport); + + spin_unlock_irqrestore(&port->lock, flags); + + /* Enable Rx Interrupt */ + s3c24xx_clear_bit(port, S3C64XX_UINTM_RXD, S3C64XX_UINTM); + + dbg("s3c64xx_serial_startup ok\n"); + return ret; +} + +/* power power management control */ + +static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level, + unsigned int old) +{ + struct s3c24xx_uart_port *ourport = to_ourport(port); + int timeout = 10000; + + ourport->pm_level = level; + + switch (level) { + case 3: + while (--timeout && !s3c24xx_serial_txempty_nofifo(port)) + udelay(100); + + if (!IS_ERR(ourport->baudclk)) + clk_disable_unprepare(ourport->baudclk); + + clk_disable_unprepare(ourport->clk); + break; + + case 0: + clk_prepare_enable(ourport->clk); + + if (!IS_ERR(ourport->baudclk)) + clk_prepare_enable(ourport->baudclk); + + break; + default: + dev_err(port->dev, "s3c24xx_serial: unknown pm %d\n", level); + } +} + +/* baud rate calculation + * + * The UARTs on the S3C2410/S3C2440 can take their clocks from a number + * of different sources, including the peripheral clock ("pclk") and an + * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk") + * with a programmable extra divisor. + * + * The following code goes through the clock sources, and calculates the + * baud clocks (and the resultant actual baud rates) and then tries to + * pick the closest one and select that. + * +*/ + +#define MAX_CLK_NAME_LENGTH 15 + +static inline int s3c24xx_serial_getsource(struct uart_port *port) +{ + struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); + unsigned int ucon; + + if (info->num_clks == 1) + return 0; + + ucon = rd_regl(port, S3C2410_UCON); + ucon &= info->clksel_mask; + return ucon >> info->clksel_shift; +} + +static void s3c24xx_serial_setsource(struct uart_port *port, + unsigned int clk_sel) +{ + struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); + unsigned int ucon; + + if (info->num_clks == 1) + return; + + ucon = rd_regl(port, S3C2410_UCON); + if ((ucon & info->clksel_mask) >> info->clksel_shift == clk_sel) + return; + + ucon &= ~info->clksel_mask; + ucon |= clk_sel << info->clksel_shift; + wr_regl(port, S3C2410_UCON, ucon); +} + +static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport, + unsigned int req_baud, struct clk **best_clk, + unsigned int *clk_num) +{ + struct s3c24xx_uart_info *info = ourport->info; + struct clk *clk; + unsigned long rate; + unsigned int cnt, baud, quot, clk_sel, best_quot = 0; + char clkname[MAX_CLK_NAME_LENGTH]; + int calc_deviation, deviation = (1 << 30) - 1; + + clk_sel = (ourport->cfg->clk_sel) ? ourport->cfg->clk_sel : + ourport->info->def_clk_sel; + for (cnt = 0; cnt < info->num_clks; cnt++) { + if (!(clk_sel & (1 << cnt))) + continue; + + sprintf(clkname, "clk_uart_baud%d", cnt); + clk = clk_get(ourport->port.dev, clkname); + if (IS_ERR(clk)) + continue; + + rate = clk_get_rate(clk); + if (!rate) + continue; + + if (ourport->info->has_divslot) { + unsigned long div = rate / req_baud; + + /* The UDIVSLOT register on the newer UARTs allows us to + * get a divisor adjustment of 1/16th on the baud clock. + * + * We don't keep the UDIVSLOT value (the 16ths we + * calculated by not multiplying the baud by 16) as it + * is easy enough to recalculate. + */ + + quot = div / 16; + baud = rate / div; + } else { + quot = (rate + (8 * req_baud)) / (16 * req_baud); + baud = rate / (quot * 16); + } + quot--; + + calc_deviation = req_baud - baud; + if (calc_deviation < 0) + calc_deviation = -calc_deviation; + + if (calc_deviation < deviation) { + *best_clk = clk; + best_quot = quot; + *clk_num = cnt; + deviation = calc_deviation; + } + } + + return best_quot; +} + +/* udivslot_table[] + * + * This table takes the fractional value of the baud divisor and gives + * the recommended setting for the UDIVSLOT register. + */ +static u16 udivslot_table[16] = { + [0] = 0x0000, + [1] = 0x0080, + [2] = 0x0808, + [3] = 0x0888, + [4] = 0x2222, + [5] = 0x4924, + [6] = 0x4A52, + [7] = 0x54AA, + [8] = 0x5555, + [9] = 0xD555, + [10] = 0xD5D5, + [11] = 0xDDD5, + [12] = 0xDDDD, + [13] = 0xDFDD, + [14] = 0xDFDF, + [15] = 0xFFDF, +}; + +static void s3c24xx_serial_set_termios(struct uart_port *port, + struct ktermios *termios, + struct ktermios *old) +{ + struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port); + struct s3c24xx_uart_port *ourport = to_ourport(port); + struct clk *clk = ERR_PTR(-EINVAL); + unsigned long flags; + unsigned int baud, quot, clk_sel = 0; + unsigned int ulcon; + unsigned int umcon; + unsigned int udivslot = 0; + + /* + * We don't support modem control lines. + */ + termios->c_cflag &= ~(HUPCL | CMSPAR); + termios->c_cflag |= CLOCAL; + + /* + * Ask the core to calculate the divisor for us. + */ + + baud = uart_get_baud_rate(port, termios, old, 0, 3000000); + quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel); + if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) + quot = port->custom_divisor; + if (IS_ERR(clk)) + return; + + /* check to see if we need to change clock source */ + + if (ourport->baudclk != clk) { + clk_prepare_enable(clk); + + s3c24xx_serial_setsource(port, clk_sel); + + if (!IS_ERR(ourport->baudclk)) { + clk_disable_unprepare(ourport->baudclk); + ourport->baudclk = ERR_PTR(-EINVAL); + } + + ourport->baudclk = clk; + ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0; + } + + if (ourport->info->has_divslot) { + unsigned int div = ourport->baudclk_rate / baud; + + if (cfg->has_fracval) { + udivslot = (div & 15); + dbg("fracval = %04x\n", udivslot); + } else { + udivslot = udivslot_table[div & 15]; + dbg("udivslot = %04x (div %d)\n", udivslot, div & 15); + } + } + + switch (termios->c_cflag & CSIZE) { + case CS5: + dbg("config: 5bits/char\n"); + ulcon = S3C2410_LCON_CS5; + break; + case CS6: + dbg("config: 6bits/char\n"); + ulcon = S3C2410_LCON_CS6; + break; + case CS7: + dbg("config: 7bits/char\n"); + ulcon = S3C2410_LCON_CS7; + break; + case CS8: + default: + dbg("config: 8bits/char\n"); + ulcon = S3C2410_LCON_CS8; + break; + } + + /* preserve original lcon IR settings */ + ulcon |= (cfg->ulcon & S3C2410_LCON_IRM); + + if (termios->c_cflag & CSTOPB) + ulcon |= S3C2410_LCON_STOPB; + + if (termios->c_cflag & PARENB) { + if (termios->c_cflag & PARODD) + ulcon |= S3C2410_LCON_PODD; + else + ulcon |= S3C2410_LCON_PEVEN; + } else { + ulcon |= S3C2410_LCON_PNONE; + } + + spin_lock_irqsave(&port->lock, flags); + + dbg("setting ulcon to %08x, brddiv to %d, udivslot %08x\n", + ulcon, quot, udivslot); + + wr_regl(port, S3C2410_ULCON, ulcon); + wr_regl(port, S3C2410_UBRDIV, quot); + + port->status &= ~UPSTAT_AUTOCTS; + + umcon = rd_regl(port, S3C2410_UMCON); + if (termios->c_cflag & CRTSCTS) { + umcon |= S3C2410_UMCOM_AFC; + /* Disable RTS when RX FIFO contains 63 bytes */ + umcon &= ~S3C2412_UMCON_AFC_8; + port->status = UPSTAT_AUTOCTS; + } else { + umcon &= ~S3C2410_UMCOM_AFC; + } + wr_regl(port, S3C2410_UMCON, umcon); + + if (ourport->info->has_divslot) + wr_regl(port, S3C2443_DIVSLOT, udivslot); + + dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n", + rd_regl(port, S3C2410_ULCON), + rd_regl(port, S3C2410_UCON), + rd_regl(port, S3C2410_UFCON)); + + /* + * Update the per-port timeout. + */ + uart_update_timeout(port, termios->c_cflag, baud); + + /* + * Which character status flags are we interested in? + */ + port->read_status_mask = S3C2410_UERSTAT_OVERRUN; + if (termios->c_iflag & INPCK) + port->read_status_mask |= S3C2410_UERSTAT_FRAME | + S3C2410_UERSTAT_PARITY; + /* + * Which character status flags should we ignore? + */ + port->ignore_status_mask = 0; + if (termios->c_iflag & IGNPAR) + port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN; + if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR) + port->ignore_status_mask |= S3C2410_UERSTAT_FRAME; + + /* + * Ignore all characters if CREAD is not set. + */ + if ((termios->c_cflag & CREAD) == 0) + port->ignore_status_mask |= RXSTAT_DUMMY_READ; + + spin_unlock_irqrestore(&port->lock, flags); +} + +static const char *s3c24xx_serial_type(struct uart_port *port) +{ + switch (port->type) { + case PORT_S3C2410: + return "S3C2410"; + case PORT_S3C2440: + return "S3C2440"; + case PORT_S3C2412: + return "S3C2412"; + case PORT_S3C6400: + return "S3C6400/10"; + default: + return NULL; + } +} + +#define MAP_SIZE (0x100) + +static void s3c24xx_serial_release_port(struct uart_port *port) +{ + release_mem_region(port->mapbase, MAP_SIZE); +} + +static int s3c24xx_serial_request_port(struct uart_port *port) +{ + const char *name = s3c24xx_serial_portname(port); + return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY; +} + +static void s3c24xx_serial_config_port(struct uart_port *port, int flags) +{ + struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); + + if (flags & UART_CONFIG_TYPE && + s3c24xx_serial_request_port(port) == 0) + port->type = info->type; +} + +/* + * verify the new serial_struct (for TIOCSSERIAL). + */ +static int +s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser) +{ + struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); + + if (ser->type != PORT_UNKNOWN && ser->type != info->type) + return -EINVAL; + + return 0; +} + + +#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE + +static struct console s3c24xx_serial_console; + +static int __init s3c24xx_serial_console_init(void) +{ + register_console(&s3c24xx_serial_console); + return 0; +} +console_initcall(s3c24xx_serial_console_init); + +#define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console +#else +#define S3C24XX_SERIAL_CONSOLE NULL +#endif + +#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL) +static int s3c24xx_serial_get_poll_char(struct uart_port *port); +static void s3c24xx_serial_put_poll_char(struct uart_port *port, + unsigned char c); +#endif + +static struct uart_ops s3c24xx_serial_ops = { + .pm = s3c24xx_serial_pm, + .tx_empty = s3c24xx_serial_tx_empty, + .get_mctrl = s3c24xx_serial_get_mctrl, + .set_mctrl = s3c24xx_serial_set_mctrl, + .stop_tx = s3c24xx_serial_stop_tx, + .start_tx = s3c24xx_serial_start_tx, + .stop_rx = s3c24xx_serial_stop_rx, + .break_ctl = s3c24xx_serial_break_ctl, + .startup = s3c24xx_serial_startup, + .shutdown = s3c24xx_serial_shutdown, + .set_termios = s3c24xx_serial_set_termios, + .type = s3c24xx_serial_type, + .release_port = s3c24xx_serial_release_port, + .request_port = s3c24xx_serial_request_port, + .config_port = s3c24xx_serial_config_port, + .verify_port = s3c24xx_serial_verify_port, +#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL) + .poll_get_char = s3c24xx_serial_get_poll_char, + .poll_put_char = s3c24xx_serial_put_poll_char, +#endif +}; + +static struct uart_driver s3c24xx_uart_drv = { + .owner = THIS_MODULE, + .driver_name = "s3c2410_serial", + .nr = CONFIG_SERIAL_SAMSUNG_UARTS, + .cons = S3C24XX_SERIAL_CONSOLE, + .dev_name = S3C24XX_SERIAL_NAME, + .major = S3C24XX_SERIAL_MAJOR, + .minor = S3C24XX_SERIAL_MINOR, +}; + +#define __PORT_LOCK_UNLOCKED(i) \ + __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[i].port.lock) +static struct s3c24xx_uart_port +s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = { + [0] = { + .port = { + .lock = __PORT_LOCK_UNLOCKED(0), + .iotype = UPIO_MEM, + .uartclk = 0, + .fifosize = 16, + .ops = &s3c24xx_serial_ops, + .flags = UPF_BOOT_AUTOCONF, + .line = 0, + } + }, + [1] = { + .port = { + .lock = __PORT_LOCK_UNLOCKED(1), + .iotype = UPIO_MEM, + .uartclk = 0, + .fifosize = 16, + .ops = &s3c24xx_serial_ops, + .flags = UPF_BOOT_AUTOCONF, + .line = 1, + } + }, +#if CONFIG_SERIAL_SAMSUNG_UARTS > 2 + + [2] = { + .port = { + .lock = __PORT_LOCK_UNLOCKED(2), + .iotype = UPIO_MEM, + .uartclk = 0, + .fifosize = 16, + .ops = &s3c24xx_serial_ops, + .flags = UPF_BOOT_AUTOCONF, + .line = 2, + } + }, +#endif +#if CONFIG_SERIAL_SAMSUNG_UARTS > 3 + [3] = { + .port = { + .lock = __PORT_LOCK_UNLOCKED(3), + .iotype = UPIO_MEM, + .uartclk = 0, + .fifosize = 16, + .ops = &s3c24xx_serial_ops, + .flags = UPF_BOOT_AUTOCONF, + .line = 3, + } + } +#endif +}; +#undef __PORT_LOCK_UNLOCKED + +/* s3c24xx_serial_resetport + * + * reset the fifos and other the settings. +*/ + +static void s3c24xx_serial_resetport(struct uart_port *port, + struct s3c2410_uartcfg *cfg) +{ + struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); + unsigned long ucon = rd_regl(port, S3C2410_UCON); + unsigned int ucon_mask; + + ucon_mask = info->clksel_mask; + if (info->type == PORT_S3C2440) + ucon_mask |= S3C2440_UCON0_DIVMASK; + + ucon &= ucon_mask; + wr_regl(port, S3C2410_UCON, ucon | cfg->ucon); + + /* reset both fifos */ + wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH); + wr_regl(port, S3C2410_UFCON, cfg->ufcon); + + /* some delay is required after fifo reset */ + udelay(1); +} + + +#ifdef CONFIG_ARM_S3C24XX_CPUFREQ + +static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb, + unsigned long val, void *data) +{ + struct s3c24xx_uart_port *port; + struct uart_port *uport; + + port = container_of(nb, struct s3c24xx_uart_port, freq_transition); + uport = &port->port; + + /* check to see if port is enabled */ + + if (port->pm_level != 0) + return 0; + + /* try and work out if the baudrate is changing, we can detect + * a change in rate, but we do not have support for detecting + * a disturbance in the clock-rate over the change. + */ + + if (IS_ERR(port->baudclk)) + goto exit; + + if (port->baudclk_rate == clk_get_rate(port->baudclk)) + goto exit; + + if (val == CPUFREQ_PRECHANGE) { + /* we should really shut the port down whilst the + * frequency change is in progress. */ + + } else if (val == CPUFREQ_POSTCHANGE) { + struct ktermios *termios; + struct tty_struct *tty; + + if (uport->state == NULL) + goto exit; + + tty = uport->state->port.tty; + + if (tty == NULL) + goto exit; + + termios = &tty->termios; + + if (termios == NULL) { + dev_warn(uport->dev, "%s: no termios?\n", __func__); + goto exit; + } + + s3c24xx_serial_set_termios(uport, termios, NULL); + } + +exit: + return 0; +} + +static inline int +s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port) +{ + port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition; + + return cpufreq_register_notifier(&port->freq_transition, + CPUFREQ_TRANSITION_NOTIFIER); +} + +static inline void +s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port) +{ + cpufreq_unregister_notifier(&port->freq_transition, + CPUFREQ_TRANSITION_NOTIFIER); +} + +#else +static inline int +s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port) +{ + return 0; +} + +static inline void +s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port) +{ +} +#endif + +static int s3c24xx_serial_enable_baudclk(struct s3c24xx_uart_port *ourport) +{ + struct device *dev = ourport->port.dev; + struct s3c24xx_uart_info *info = ourport->info; + char clk_name[MAX_CLK_NAME_LENGTH]; + unsigned int clk_sel; + struct clk *clk; + int clk_num; + int ret; + + clk_sel = ourport->cfg->clk_sel ? : info->def_clk_sel; + for (clk_num = 0; clk_num < info->num_clks; clk_num++) { + if (!(clk_sel & (1 << clk_num))) + continue; + + sprintf(clk_name, "clk_uart_baud%d", clk_num); + clk = clk_get(dev, clk_name); + if (IS_ERR(clk)) + continue; + + ret = clk_prepare_enable(clk); + if (ret) { + clk_put(clk); + continue; + } + + ourport->baudclk = clk; + ourport->baudclk_rate = clk_get_rate(clk); + s3c24xx_serial_setsource(&ourport->port, clk_num); + + return 0; + } + + return -EINVAL; +} + +/* s3c24xx_serial_init_port + * + * initialise a single serial port from the platform device given + */ + +static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport, + struct platform_device *platdev) +{ + struct uart_port *port = &ourport->port; + struct s3c2410_uartcfg *cfg = ourport->cfg; + struct resource *res; + int ret; + + dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev); + + if (platdev == NULL) + return -ENODEV; + + if (port->mapbase != 0) + return -EINVAL; + + /* setup info for port */ + port->dev = &platdev->dev; + + /* Startup sequence is different for s3c64xx and higher SoC's */ + if (s3c24xx_serial_has_interrupt_mask(port)) + s3c24xx_serial_ops.startup = s3c64xx_serial_startup; + + port->uartclk = 1; + + if (cfg->uart_flags & UPF_CONS_FLOW) { + dbg("s3c24xx_serial_init_port: enabling flow control\n"); + port->flags |= UPF_CONS_FLOW; + } + + /* sort our the physical and virtual addresses for each UART */ + + res = platform_get_resource(platdev, IORESOURCE_MEM, 0); + if (res == NULL) { + dev_err(port->dev, "failed to find memory resource for uart\n"); + return -EINVAL; + } + + dbg("resource %pR)\n", res); + + port->membase = devm_ioremap(port->dev, res->start, resource_size(res)); + if (!port->membase) { + dev_err(port->dev, "failed to remap controller address\n"); + return -EBUSY; + } + + port->mapbase = res->start; + ret = platform_get_irq(platdev, 0); + if (ret < 0) + port->irq = 0; + else { + port->irq = ret; + ourport->rx_irq = ret; + ourport->tx_irq = ret + 1; + } + + ret = platform_get_irq(platdev, 1); + if (ret > 0) + ourport->tx_irq = ret; + /* + * DMA is currently supported only on DT platforms, if DMA properties + * are specified. + */ + if (platdev->dev.of_node && of_find_property(platdev->dev.of_node, + "dmas", NULL)) { + ourport->dma = devm_kzalloc(port->dev, + sizeof(*ourport->dma), + GFP_KERNEL); + if (!ourport->dma) { + ret = -ENOMEM; + goto err; + } + } + + ourport->clk = clk_get(&platdev->dev, "uart"); + if (IS_ERR(ourport->clk)) { + pr_err("%s: Controller clock not found\n", + dev_name(&platdev->dev)); + ret = PTR_ERR(ourport->clk); + goto err; + } + + ret = clk_prepare_enable(ourport->clk); + if (ret) { + pr_err("uart: clock failed to prepare+enable: %d\n", ret); + clk_put(ourport->clk); + goto err; + } + + ret = s3c24xx_serial_enable_baudclk(ourport); + if (ret) + pr_warn("uart: failed to enable baudclk\n"); + + /* Keep all interrupts masked and cleared */ + if (s3c24xx_serial_has_interrupt_mask(port)) { + wr_regl(port, S3C64XX_UINTM, 0xf); + wr_regl(port, S3C64XX_UINTP, 0xf); + wr_regl(port, S3C64XX_UINTSP, 0xf); + } + + dbg("port: map=%pa, mem=%p, irq=%d (%d,%d), clock=%u\n", + &port->mapbase, port->membase, port->irq, + ourport->rx_irq, ourport->tx_irq, port->uartclk); + + /* reset the fifos (and setup the uart) */ + s3c24xx_serial_resetport(port, cfg); + + return 0; + +err: + port->mapbase = 0; + return ret; +} + +/* Device driver serial port probe */ + +static const struct of_device_id s3c24xx_uart_dt_match[]; +static int probe_index; + +static inline struct s3c24xx_serial_drv_data *s3c24xx_get_driver_data( + struct platform_device *pdev) +{ +#ifdef CONFIG_OF + if (pdev->dev.of_node) { + const struct of_device_id *match; + match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node); + return (struct s3c24xx_serial_drv_data *)match->data; + } +#endif + return (struct s3c24xx_serial_drv_data *) + platform_get_device_id(pdev)->driver_data; +} + +static int s3c24xx_serial_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct s3c24xx_uart_port *ourport; + int index = probe_index; + int ret; + + if (np) { + ret = of_alias_get_id(np, "serial"); + if (ret >= 0) + index = ret; + } + + dbg("s3c24xx_serial_probe(%p) %d\n", pdev, index); + + if (index >= ARRAY_SIZE(s3c24xx_serial_ports)) { + dev_err(&pdev->dev, "serial%d out of range\n", index); + return -EINVAL; + } + ourport = &s3c24xx_serial_ports[index]; + + ourport->drv_data = s3c24xx_get_driver_data(pdev); + if (!ourport->drv_data) { + dev_err(&pdev->dev, "could not find driver data\n"); + return -ENODEV; + } + + ourport->baudclk = ERR_PTR(-EINVAL); + ourport->info = ourport->drv_data->info; + ourport->cfg = (dev_get_platdata(&pdev->dev)) ? + dev_get_platdata(&pdev->dev) : + ourport->drv_data->def_cfg; + + if (np) + of_property_read_u32(np, + "samsung,uart-fifosize", &ourport->port.fifosize); + + if (ourport->drv_data->fifosize[index]) + ourport->port.fifosize = ourport->drv_data->fifosize[index]; + else if (ourport->info->fifosize) + ourport->port.fifosize = ourport->info->fifosize; + + /* + * DMA transfers must be aligned at least to cache line size, + * so find minimal transfer size suitable for DMA mode + */ + ourport->min_dma_size = max_t(int, ourport->port.fifosize, + dma_get_cache_alignment()); + + dbg("%s: initialising port %p...\n", __func__, ourport); + + ret = s3c24xx_serial_init_port(ourport, pdev); + if (ret < 0) + return ret; + + if (!s3c24xx_uart_drv.state) { + ret = uart_register_driver(&s3c24xx_uart_drv); + if (ret < 0) { + pr_err("Failed to register Samsung UART driver\n"); + return ret; + } + } + + dbg("%s: adding port\n", __func__); + uart_add_one_port(&s3c24xx_uart_drv, &ourport->port); + platform_set_drvdata(pdev, &ourport->port); + + /* + * Deactivate the clock enabled in s3c24xx_serial_init_port here, + * so that a potential re-enablement through the pm-callback overlaps + * and keeps the clock enabled in this case. + */ + clk_disable_unprepare(ourport->clk); + if (!IS_ERR(ourport->baudclk)) + clk_disable_unprepare(ourport->baudclk); + + ret = s3c24xx_serial_cpufreq_register(ourport); + if (ret < 0) + dev_err(&pdev->dev, "failed to add cpufreq notifier\n"); + + probe_index++; + + return 0; +} + +static int s3c24xx_serial_remove(struct platform_device *dev) +{ + struct uart_port *port = s3c24xx_dev_to_port(&dev->dev); + + if (port) { + s3c24xx_serial_cpufreq_deregister(to_ourport(port)); + uart_remove_one_port(&s3c24xx_uart_drv, port); + } + + uart_unregister_driver(&s3c24xx_uart_drv); + + return 0; +} + +/* UART power management code */ +#ifdef CONFIG_PM_SLEEP +static int s3c24xx_serial_suspend(struct device *dev) +{ + struct uart_port *port = s3c24xx_dev_to_port(dev); + + if (port) + uart_suspend_port(&s3c24xx_uart_drv, port); + + return 0; +} + +static int s3c24xx_serial_resume(struct device *dev) +{ + struct uart_port *port = s3c24xx_dev_to_port(dev); + struct s3c24xx_uart_port *ourport = to_ourport(port); + + if (port) { + clk_prepare_enable(ourport->clk); + if (!IS_ERR(ourport->baudclk)) + clk_prepare_enable(ourport->baudclk); + s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port)); + if (!IS_ERR(ourport->baudclk)) + clk_disable_unprepare(ourport->baudclk); + clk_disable_unprepare(ourport->clk); + + uart_resume_port(&s3c24xx_uart_drv, port); + } + + return 0; +} + +static int s3c24xx_serial_resume_noirq(struct device *dev) +{ + struct uart_port *port = s3c24xx_dev_to_port(dev); + struct s3c24xx_uart_port *ourport = to_ourport(port); + + if (port) { + /* restore IRQ mask */ + if (s3c24xx_serial_has_interrupt_mask(port)) { + unsigned int uintm = 0xf; + if (tx_enabled(port)) + uintm &= ~S3C64XX_UINTM_TXD_MSK; + if (rx_enabled(port)) + uintm &= ~S3C64XX_UINTM_RXD_MSK; + clk_prepare_enable(ourport->clk); + if (!IS_ERR(ourport->baudclk)) + clk_prepare_enable(ourport->baudclk); + wr_regl(port, S3C64XX_UINTM, uintm); + if (!IS_ERR(ourport->baudclk)) + clk_disable_unprepare(ourport->baudclk); + clk_disable_unprepare(ourport->clk); + } + } + + return 0; +} + +static const struct dev_pm_ops s3c24xx_serial_pm_ops = { + .suspend = s3c24xx_serial_suspend, + .resume = s3c24xx_serial_resume, + .resume_noirq = s3c24xx_serial_resume_noirq, +}; +#define SERIAL_SAMSUNG_PM_OPS (&s3c24xx_serial_pm_ops) + +#else /* !CONFIG_PM_SLEEP */ + +#define SERIAL_SAMSUNG_PM_OPS NULL +#endif /* CONFIG_PM_SLEEP */ + +/* Console code */ + +#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE + +static struct uart_port *cons_uart; + +static int +s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon) +{ + struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); + unsigned long ufstat, utrstat; + + if (ufcon & S3C2410_UFCON_FIFOMODE) { + /* fifo mode - check amount of data in fifo registers... */ + + ufstat = rd_regl(port, S3C2410_UFSTAT); + return (ufstat & info->tx_fifofull) ? 0 : 1; + } + + /* in non-fifo mode, we go and use the tx buffer empty */ + + utrstat = rd_regl(port, S3C2410_UTRSTAT); + return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0; +} + +static bool +s3c24xx_port_configured(unsigned int ucon) +{ + /* consider the serial port configured if the tx/rx mode set */ + return (ucon & 0xf) != 0; +} + +#ifdef CONFIG_CONSOLE_POLL +/* + * Console polling routines for writing and reading from the uart while + * in an interrupt or debug context. + */ + +static int s3c24xx_serial_get_poll_char(struct uart_port *port) +{ + struct s3c24xx_uart_port *ourport = to_ourport(port); + unsigned int ufstat; + + ufstat = rd_regl(port, S3C2410_UFSTAT); + if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0) + return NO_POLL_CHAR; + + return rd_regb(port, S3C2410_URXH); +} + +static void s3c24xx_serial_put_poll_char(struct uart_port *port, + unsigned char c) +{ + unsigned int ufcon = rd_regl(port, S3C2410_UFCON); + unsigned int ucon = rd_regl(port, S3C2410_UCON); + + /* not possible to xmit on unconfigured port */ + if (!s3c24xx_port_configured(ucon)) + return; + + while (!s3c24xx_serial_console_txrdy(port, ufcon)) + cpu_relax(); + wr_regb(port, S3C2410_UTXH, c); +} + +#endif /* CONFIG_CONSOLE_POLL */ + +static void +s3c24xx_serial_console_putchar(struct uart_port *port, int ch) +{ + unsigned int ufcon = rd_regl(port, S3C2410_UFCON); + + while (!s3c24xx_serial_console_txrdy(port, ufcon)) + cpu_relax(); + wr_regb(port, S3C2410_UTXH, ch); +} + +static void +s3c24xx_serial_console_write(struct console *co, const char *s, + unsigned int count) +{ + unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON); + + /* not possible to xmit on unconfigured port */ + if (!s3c24xx_port_configured(ucon)) + return; + + uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar); +} + +static void __init +s3c24xx_serial_get_options(struct uart_port *port, int *baud, + int *parity, int *bits) +{ + struct clk *clk; + unsigned int ulcon; + unsigned int ucon; + unsigned int ubrdiv; + unsigned long rate; + unsigned int clk_sel; + char clk_name[MAX_CLK_NAME_LENGTH]; + + ulcon = rd_regl(port, S3C2410_ULCON); + ucon = rd_regl(port, S3C2410_UCON); + ubrdiv = rd_regl(port, S3C2410_UBRDIV); + + dbg("s3c24xx_serial_get_options: port=%p\n" + "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n", + port, ulcon, ucon, ubrdiv); + + if (s3c24xx_port_configured(ucon)) { + switch (ulcon & S3C2410_LCON_CSMASK) { + case S3C2410_LCON_CS5: + *bits = 5; + break; + case S3C2410_LCON_CS6: + *bits = 6; + break; + case S3C2410_LCON_CS7: + *bits = 7; + break; + case S3C2410_LCON_CS8: + default: + *bits = 8; + break; + } + + switch (ulcon & S3C2410_LCON_PMASK) { + case S3C2410_LCON_PEVEN: + *parity = 'e'; + break; + + case S3C2410_LCON_PODD: + *parity = 'o'; + break; + + case S3C2410_LCON_PNONE: + default: + *parity = 'n'; + } + + /* now calculate the baud rate */ + + clk_sel = s3c24xx_serial_getsource(port); + sprintf(clk_name, "clk_uart_baud%d", clk_sel); + + clk = clk_get(port->dev, clk_name); + if (!IS_ERR(clk)) + rate = clk_get_rate(clk); + else + rate = 1; + + *baud = rate / (16 * (ubrdiv + 1)); + dbg("calculated baud %d\n", *baud); + } + +} + +static int __init +s3c24xx_serial_console_setup(struct console *co, char *options) +{ + struct uart_port *port; + int baud = 9600; + int bits = 8; + int parity = 'n'; + int flow = 'n'; + + dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n", + co, co->index, options); + + /* is this a valid port */ + + if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS) + co->index = 0; + + port = &s3c24xx_serial_ports[co->index].port; + + /* is the port configured? */ + + if (port->mapbase == 0x0) + return -ENODEV; + + cons_uart = port; + + dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index); + + /* + * Check whether an invalid uart number has been specified, and + * if so, search for the first available port that does have + * console support. + */ + if (options) + uart_parse_options(options, &baud, &parity, &bits, &flow); + else + s3c24xx_serial_get_options(port, &baud, &parity, &bits); + + dbg("s3c24xx_serial_console_setup: baud %d\n", baud); + + return uart_set_options(port, co, baud, parity, bits, flow); +} + +static struct console s3c24xx_serial_console = { + .name = S3C24XX_SERIAL_NAME, + .device = uart_console_device, + .flags = CON_PRINTBUFFER, + .index = -1, + .write = s3c24xx_serial_console_write, + .setup = s3c24xx_serial_console_setup, + .data = &s3c24xx_uart_drv, +}; +#endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */ + +#ifdef CONFIG_CPU_S3C2410 +static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = { + .info = &(struct s3c24xx_uart_info) { + .name = "Samsung S3C2410 UART", + .type = PORT_S3C2410, + .fifosize = 16, + .rx_fifomask = S3C2410_UFSTAT_RXMASK, + .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT, + .rx_fifofull = S3C2410_UFSTAT_RXFULL, + .tx_fifofull = S3C2410_UFSTAT_TXFULL, + .tx_fifomask = S3C2410_UFSTAT_TXMASK, + .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT, + .def_clk_sel = S3C2410_UCON_CLKSEL0, + .num_clks = 2, + .clksel_mask = S3C2410_UCON_CLKMASK, + .clksel_shift = S3C2410_UCON_CLKSHIFT, + }, + .def_cfg = &(struct s3c2410_uartcfg) { + .ucon = S3C2410_UCON_DEFAULT, + .ufcon = S3C2410_UFCON_DEFAULT, + }, +}; +#define S3C2410_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2410_serial_drv_data) +#else +#define S3C2410_SERIAL_DRV_DATA (kernel_ulong_t)NULL +#endif + +#ifdef CONFIG_CPU_S3C2412 +static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = { + .info = &(struct s3c24xx_uart_info) { + .name = "Samsung S3C2412 UART", + .type = PORT_S3C2412, + .fifosize = 64, + .has_divslot = 1, + .rx_fifomask = S3C2440_UFSTAT_RXMASK, + .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT, + .rx_fifofull = S3C2440_UFSTAT_RXFULL, + .tx_fifofull = S3C2440_UFSTAT_TXFULL, + .tx_fifomask = S3C2440_UFSTAT_TXMASK, + .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT, + .def_clk_sel = S3C2410_UCON_CLKSEL2, + .num_clks = 4, + .clksel_mask = S3C2412_UCON_CLKMASK, + .clksel_shift = S3C2412_UCON_CLKSHIFT, + }, + .def_cfg = &(struct s3c2410_uartcfg) { + .ucon = S3C2410_UCON_DEFAULT, + .ufcon = S3C2410_UFCON_DEFAULT, + }, +}; +#define S3C2412_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2412_serial_drv_data) +#else +#define S3C2412_SERIAL_DRV_DATA (kernel_ulong_t)NULL +#endif + +#if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2416) || \ + defined(CONFIG_CPU_S3C2443) || defined(CONFIG_CPU_S3C2442) +static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = { + .info = &(struct s3c24xx_uart_info) { + .name = "Samsung S3C2440 UART", + .type = PORT_S3C2440, + .fifosize = 64, + .has_divslot = 1, + .rx_fifomask = S3C2440_UFSTAT_RXMASK, + .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT, + .rx_fifofull = S3C2440_UFSTAT_RXFULL, + .tx_fifofull = S3C2440_UFSTAT_TXFULL, + .tx_fifomask = S3C2440_UFSTAT_TXMASK, + .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT, + .def_clk_sel = S3C2410_UCON_CLKSEL2, + .num_clks = 4, + .clksel_mask = S3C2412_UCON_CLKMASK, + .clksel_shift = S3C2412_UCON_CLKSHIFT, + }, + .def_cfg = &(struct s3c2410_uartcfg) { + .ucon = S3C2410_UCON_DEFAULT, + .ufcon = S3C2410_UFCON_DEFAULT, + }, +}; +#define S3C2440_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2440_serial_drv_data) +#else +#define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL +#endif + +#if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410) +static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = { + .info = &(struct s3c24xx_uart_info) { + .name = "Samsung S3C6400 UART", + .type = PORT_S3C6400, + .fifosize = 64, + .has_divslot = 1, + .rx_fifomask = S3C2440_UFSTAT_RXMASK, + .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT, + .rx_fifofull = S3C2440_UFSTAT_RXFULL, + .tx_fifofull = S3C2440_UFSTAT_TXFULL, + .tx_fifomask = S3C2440_UFSTAT_TXMASK, + .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT, + .def_clk_sel = S3C2410_UCON_CLKSEL2, + .num_clks = 4, + .clksel_mask = S3C6400_UCON_CLKMASK, + .clksel_shift = S3C6400_UCON_CLKSHIFT, + }, + .def_cfg = &(struct s3c2410_uartcfg) { + .ucon = S3C2410_UCON_DEFAULT, + .ufcon = S3C2410_UFCON_DEFAULT, + }, +}; +#define S3C6400_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c6400_serial_drv_data) +#else +#define S3C6400_SERIAL_DRV_DATA (kernel_ulong_t)NULL +#endif + +#ifdef CONFIG_CPU_S5PV210 +static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = { + .info = &(struct s3c24xx_uart_info) { + .name = "Samsung S5PV210 UART", + .type = PORT_S3C6400, + .has_divslot = 1, + .rx_fifomask = S5PV210_UFSTAT_RXMASK, + .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, + .rx_fifofull = S5PV210_UFSTAT_RXFULL, + .tx_fifofull = S5PV210_UFSTAT_TXFULL, + .tx_fifomask = S5PV210_UFSTAT_TXMASK, + .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT, + .def_clk_sel = S3C2410_UCON_CLKSEL0, + .num_clks = 2, + .clksel_mask = S5PV210_UCON_CLKMASK, + .clksel_shift = S5PV210_UCON_CLKSHIFT, + }, + .def_cfg = &(struct s3c2410_uartcfg) { + .ucon = S5PV210_UCON_DEFAULT, + .ufcon = S5PV210_UFCON_DEFAULT, + }, + .fifosize = { 256, 64, 16, 16 }, +}; +#define S5PV210_SERIAL_DRV_DATA ((kernel_ulong_t)&s5pv210_serial_drv_data) +#else +#define S5PV210_SERIAL_DRV_DATA (kernel_ulong_t)NULL +#endif + +#if defined(CONFIG_ARCH_EXYNOS) +#define EXYNOS_COMMON_SERIAL_DRV_DATA \ + .info = &(struct s3c24xx_uart_info) { \ + .name = "Samsung Exynos UART", \ + .type = PORT_S3C6400, \ + .has_divslot = 1, \ + .rx_fifomask = S5PV210_UFSTAT_RXMASK, \ + .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, \ + .rx_fifofull = S5PV210_UFSTAT_RXFULL, \ + .tx_fifofull = S5PV210_UFSTAT_TXFULL, \ + .tx_fifomask = S5PV210_UFSTAT_TXMASK, \ + .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT, \ + .def_clk_sel = S3C2410_UCON_CLKSEL0, \ + .num_clks = 1, \ + .clksel_mask = 0, \ + .clksel_shift = 0, \ + }, \ + .def_cfg = &(struct s3c2410_uartcfg) { \ + .ucon = S5PV210_UCON_DEFAULT, \ + .ufcon = S5PV210_UFCON_DEFAULT, \ + .has_fracval = 1, \ + } \ + +static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = { + EXYNOS_COMMON_SERIAL_DRV_DATA, + .fifosize = { 256, 64, 16, 16 }, +}; + +static struct s3c24xx_serial_drv_data exynos5433_serial_drv_data = { + EXYNOS_COMMON_SERIAL_DRV_DATA, + .fifosize = { 64, 256, 16, 256 }, +}; + +#define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data) +#define EXYNOS5433_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos5433_serial_drv_data) +#else +#define EXYNOS4210_SERIAL_DRV_DATA (kernel_ulong_t)NULL +#define EXYNOS5433_SERIAL_DRV_DATA (kernel_ulong_t)NULL +#endif + +static const struct platform_device_id s3c24xx_serial_driver_ids[] = { + { + .name = "s3c2410-uart", + .driver_data = S3C2410_SERIAL_DRV_DATA, + }, { + .name = "s3c2412-uart", + .driver_data = S3C2412_SERIAL_DRV_DATA, + }, { + .name = "s3c2440-uart", + .driver_data = S3C2440_SERIAL_DRV_DATA, + }, { + .name = "s3c6400-uart", + .driver_data = S3C6400_SERIAL_DRV_DATA, + }, { + .name = "s5pv210-uart", + .driver_data = S5PV210_SERIAL_DRV_DATA, + }, { + .name = "exynos4210-uart", + .driver_data = EXYNOS4210_SERIAL_DRV_DATA, + }, { + .name = "exynos5433-uart", + .driver_data = EXYNOS5433_SERIAL_DRV_DATA, + }, + { }, +}; +MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids); + +#ifdef CONFIG_OF +static const struct of_device_id s3c24xx_uart_dt_match[] = { + { .compatible = "samsung,s3c2410-uart", + .data = (void *)S3C2410_SERIAL_DRV_DATA }, + { .compatible = "samsung,s3c2412-uart", + .data = (void *)S3C2412_SERIAL_DRV_DATA }, + { .compatible = "samsung,s3c2440-uart", + .data = (void *)S3C2440_SERIAL_DRV_DATA }, + { .compatible = "samsung,s3c6400-uart", + .data = (void *)S3C6400_SERIAL_DRV_DATA }, + { .compatible = "samsung,s5pv210-uart", + .data = (void *)S5PV210_SERIAL_DRV_DATA }, + { .compatible = "samsung,exynos4210-uart", + .data = (void *)EXYNOS4210_SERIAL_DRV_DATA }, + { .compatible = "samsung,exynos5433-uart", + .data = (void *)EXYNOS5433_SERIAL_DRV_DATA }, + {}, +}; +MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match); +#endif + +static struct platform_driver samsung_serial_driver = { + .probe = s3c24xx_serial_probe, + .remove = s3c24xx_serial_remove, + .id_table = s3c24xx_serial_driver_ids, + .driver = { + .name = "samsung-uart", + .pm = SERIAL_SAMSUNG_PM_OPS, + .of_match_table = of_match_ptr(s3c24xx_uart_dt_match), + }, +}; + +module_platform_driver(samsung_serial_driver); + +#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE +/* + * Early console. + */ + +struct samsung_early_console_data { + u32 txfull_mask; +}; + +static void samsung_early_busyuart(struct uart_port *port) +{ + while (!(readl(port->membase + S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXFE)) + ; +} + +static void samsung_early_busyuart_fifo(struct uart_port *port) +{ + struct samsung_early_console_data *data = port->private_data; + + while (readl(port->membase + S3C2410_UFSTAT) & data->txfull_mask) + ; +} + +static void samsung_early_putc(struct uart_port *port, int c) +{ + if (readl(port->membase + S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE) + samsung_early_busyuart_fifo(port); + else + samsung_early_busyuart(port); + + writeb(c, port->membase + S3C2410_UTXH); +} + +static void samsung_early_write(struct console *con, const char *s, unsigned n) +{ + struct earlycon_device *dev = con->data; + + uart_console_write(&dev->port, s, n, samsung_early_putc); +} + +static int __init samsung_early_console_setup(struct earlycon_device *device, + const char *opt) +{ + if (!device->port.membase) + return -ENODEV; + + device->con->write = samsung_early_write; + return 0; +} + +/* S3C2410 */ +static struct samsung_early_console_data s3c2410_early_console_data = { + .txfull_mask = S3C2410_UFSTAT_TXFULL, +}; + +static int __init s3c2410_early_console_setup(struct earlycon_device *device, + const char *opt) +{ + device->port.private_data = &s3c2410_early_console_data; + return samsung_early_console_setup(device, opt); +} +OF_EARLYCON_DECLARE(s3c2410, "samsung,s3c2410-uart", + s3c2410_early_console_setup); + +/* S3C2412, S3C2440, S3C64xx */ +static struct samsung_early_console_data s3c2440_early_console_data = { + .txfull_mask = S3C2440_UFSTAT_TXFULL, +}; + +static int __init s3c2440_early_console_setup(struct earlycon_device *device, + const char *opt) +{ + device->port.private_data = &s3c2440_early_console_data; + return samsung_early_console_setup(device, opt); +} +OF_EARLYCON_DECLARE(s3c2412, "samsung,s3c2412-uart", + s3c2440_early_console_setup); +OF_EARLYCON_DECLARE(s3c2440, "samsung,s3c2440-uart", + s3c2440_early_console_setup); +OF_EARLYCON_DECLARE(s3c6400, "samsung,s3c6400-uart", + s3c2440_early_console_setup); + +/* S5PV210, EXYNOS */ +static struct samsung_early_console_data s5pv210_early_console_data = { + .txfull_mask = S5PV210_UFSTAT_TXFULL, +}; + +static int __init s5pv210_early_console_setup(struct earlycon_device *device, + const char *opt) +{ + device->port.private_data = &s5pv210_early_console_data; + return samsung_early_console_setup(device, opt); +} +OF_EARLYCON_DECLARE(s5pv210, "samsung,s5pv210-uart", + s5pv210_early_console_setup); +OF_EARLYCON_DECLARE(exynos4210, "samsung,exynos4210-uart", + s5pv210_early_console_setup); +#endif + +MODULE_ALIAS("platform:samsung-uart"); +MODULE_DESCRIPTION("Samsung SoC Serial port driver"); +MODULE_AUTHOR("Ben Dooks "); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3