diff options
Diffstat (limited to 'arch/cris/arch-v32/drivers/sync_serial.c')
| -rw-r--r-- | arch/cris/arch-v32/drivers/sync_serial.c | 1715 |
1 files changed, 0 insertions, 1715 deletions
diff --git a/arch/cris/arch-v32/drivers/sync_serial.c b/arch/cris/arch-v32/drivers/sync_serial.c deleted file mode 100644 index 1b0ce8a8af16..000000000000 --- a/arch/cris/arch-v32/drivers/sync_serial.c +++ /dev/null @@ -1,1715 +0,0 @@ -/* - * Simple synchronous serial port driver for ETRAX FS and ARTPEC-3. - * - * Copyright (c) 2005, 2008 Axis Communications AB - * Author: Mikael Starvik - * - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/types.h> -#include <linux/errno.h> -#include <linux/major.h> -#include <linux/sched/signal.h> -#include <linux/mutex.h> -#include <linux/interrupt.h> -#include <linux/poll.h> -#include <linux/fs.h> -#include <linux/cdev.h> -#include <linux/device.h> -#include <linux/wait.h> - -#include <asm/io.h> -#include <mach/dma.h> -#include <pinmux.h> -#include <hwregs/reg_rdwr.h> -#include <hwregs/sser_defs.h> -#include <hwregs/timer_defs.h> -#include <hwregs/dma_defs.h> -#include <hwregs/dma.h> -#include <hwregs/intr_vect_defs.h> -#include <hwregs/intr_vect.h> -#include <hwregs/reg_map.h> -#include <asm/sync_serial.h> - - -/* The receiver is a bit tricky because of the continuous stream of data.*/ -/* */ -/* Three DMA descriptors are linked together. Each DMA descriptor is */ -/* responsible for port->bufchunk of a common buffer. */ -/* */ -/* +---------------------------------------------+ */ -/* | +----------+ +----------+ +----------+ | */ -/* +-> | Descr[0] |-->| Descr[1] |-->| Descr[2] |-+ */ -/* +----------+ +----------+ +----------+ */ -/* | | | */ -/* v v v */ -/* +-------------------------------------+ */ -/* | BUFFER | */ -/* +-------------------------------------+ */ -/* |<- data_avail ->| */ -/* readp writep */ -/* */ -/* If the application keeps up the pace readp will be right after writep.*/ -/* If the application can't keep the pace we have to throw away data. */ -/* The idea is that readp should be ready with the data pointed out by */ -/* Descr[i] when the DMA has filled in Descr[i+1]. */ -/* Otherwise we will discard */ -/* the rest of the data pointed out by Descr1 and set readp to the start */ -/* of Descr2 */ - -/* IN_BUFFER_SIZE should be a multiple of 6 to make sure that 24 bit */ -/* words can be handled */ -#define IN_DESCR_SIZE SSP_INPUT_CHUNK_SIZE -#define NBR_IN_DESCR (8*6) -#define IN_BUFFER_SIZE (IN_DESCR_SIZE * NBR_IN_DESCR) - -#define NBR_OUT_DESCR 8 -#define OUT_BUFFER_SIZE (1024 * NBR_OUT_DESCR) - -#define DEFAULT_FRAME_RATE 0 -#define DEFAULT_WORD_RATE 7 - -/* To be removed when we move to pure udev. */ -#define SYNC_SERIAL_MAJOR 125 - -/* NOTE: Enabling some debug will likely cause overrun or underrun, - * especially if manual mode is used. - */ -#define DEBUG(x) -#define DEBUGREAD(x) -#define DEBUGWRITE(x) -#define DEBUGPOLL(x) -#define DEBUGRXINT(x) -#define DEBUGTXINT(x) -#define DEBUGTRDMA(x) -#define DEBUGOUTBUF(x) - -enum syncser_irq_setup { - no_irq_setup = 0, - dma_irq_setup = 1, - manual_irq_setup = 2, -}; - -struct sync_port { - unsigned long regi_sser; - unsigned long regi_dmain; - unsigned long regi_dmaout; - - /* Interrupt vectors. */ - unsigned long dma_in_intr_vect; /* Used for DMA in. */ - unsigned long dma_out_intr_vect; /* Used for DMA out. */ - unsigned long syncser_intr_vect; /* Used when no DMA. */ - - /* DMA number for in and out. */ - unsigned int dma_in_nbr; - unsigned int dma_out_nbr; - - /* DMA owner. */ - enum dma_owner req_dma; - - char started; /* 1 if port has been started */ - char port_nbr; /* Port 0 or 1 */ - char busy; /* 1 if port is busy */ - - char enabled; /* 1 if port is enabled */ - char use_dma; /* 1 if port uses dma */ - char tr_running; - - enum syncser_irq_setup init_irqs; - int output; - int input; - - /* Next byte to be read by application */ - unsigned char *readp; - /* Next byte to be written by etrax */ - unsigned char *writep; - - unsigned int in_buffer_size; - unsigned int in_buffer_len; - unsigned int inbufchunk; - /* Data buffers for in and output. */ - unsigned char out_buffer[OUT_BUFFER_SIZE] __aligned(32); - unsigned char in_buffer[IN_BUFFER_SIZE] __aligned(32); - unsigned char flip[IN_BUFFER_SIZE] __aligned(32); - struct timespec timestamp[NBR_IN_DESCR]; - struct dma_descr_data *next_rx_desc; - struct dma_descr_data *prev_rx_desc; - - struct timeval last_timestamp; - int read_ts_idx; - int write_ts_idx; - - /* Pointer to the first available descriptor in the ring, - * unless active_tr_descr == catch_tr_descr and a dma - * transfer is active */ - struct dma_descr_data *active_tr_descr; - - /* Pointer to the first allocated descriptor in the ring */ - struct dma_descr_data *catch_tr_descr; - - /* Pointer to the descriptor with the current end-of-list */ - struct dma_descr_data *prev_tr_descr; - int full; - - /* Pointer to the first byte being read by DMA - * or current position in out_buffer if not using DMA. */ - unsigned char *out_rd_ptr; - - /* Number of bytes currently locked for being read by DMA */ - int out_buf_count; - - dma_descr_context in_context __aligned(32); - dma_descr_context out_context __aligned(32); - dma_descr_data in_descr[NBR_IN_DESCR] __aligned(16); - dma_descr_data out_descr[NBR_OUT_DESCR] __aligned(16); - - wait_queue_head_t out_wait_q; - wait_queue_head_t in_wait_q; - - spinlock_t lock; -}; - -static DEFINE_MUTEX(sync_serial_mutex); -static int etrax_sync_serial_init(void); -static void initialize_port(int portnbr); -static inline int sync_data_avail(struct sync_port *port); - -static int sync_serial_open(struct inode *, struct file *); -static int sync_serial_release(struct inode *, struct file *); -static __poll_t sync_serial_poll(struct file *filp, poll_table *wait); - -static long sync_serial_ioctl(struct file *file, - unsigned int cmd, unsigned long arg); -static int sync_serial_ioctl_unlocked(struct file *file, - unsigned int cmd, unsigned long arg); -static ssize_t sync_serial_write(struct file *file, const char __user *buf, - size_t count, loff_t *ppos); -static ssize_t sync_serial_read(struct file *file, char __user *buf, - size_t count, loff_t *ppos); - -#if ((defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \ - defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \ - (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \ - defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))) -#define SYNC_SER_DMA -#else -#define SYNC_SER_MANUAL -#endif - -#ifdef SYNC_SER_DMA -static void start_dma_out(struct sync_port *port, const char *data, int count); -static void start_dma_in(struct sync_port *port); -static irqreturn_t tr_interrupt(int irq, void *dev_id); -static irqreturn_t rx_interrupt(int irq, void *dev_id); -#endif -#ifdef SYNC_SER_MANUAL -static void send_word(struct sync_port *port); -static irqreturn_t manual_interrupt(int irq, void *dev_id); -#endif - -#define artpec_pinmux_alloc_fixed crisv32_pinmux_alloc_fixed -#define artpec_request_dma crisv32_request_dma -#define artpec_free_dma crisv32_free_dma - -#ifdef CONFIG_ETRAXFS -/* ETRAX FS */ -#define DMA_OUT_NBR0 SYNC_SER0_TX_DMA_NBR -#define DMA_IN_NBR0 SYNC_SER0_RX_DMA_NBR -#define DMA_OUT_NBR1 SYNC_SER1_TX_DMA_NBR -#define DMA_IN_NBR1 SYNC_SER1_RX_DMA_NBR -#define PINMUX_SSER0 pinmux_sser0 -#define PINMUX_SSER1 pinmux_sser1 -#define SYNCSER_INST0 regi_sser0 -#define SYNCSER_INST1 regi_sser1 -#define SYNCSER_INTR_VECT0 SSER0_INTR_VECT -#define SYNCSER_INTR_VECT1 SSER1_INTR_VECT -#define OUT_DMA_INST0 regi_dma4 -#define IN_DMA_INST0 regi_dma5 -#define DMA_OUT_INTR_VECT0 DMA4_INTR_VECT -#define DMA_OUT_INTR_VECT1 DMA7_INTR_VECT -#define DMA_IN_INTR_VECT0 DMA5_INTR_VECT -#define DMA_IN_INTR_VECT1 DMA6_INTR_VECT -#define REQ_DMA_SYNCSER0 dma_sser0 -#define REQ_DMA_SYNCSER1 dma_sser1 -#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA) -#define PORT1_DMA 1 -#else -#define PORT1_DMA 0 -#endif -#elif defined(CONFIG_CRIS_MACH_ARTPEC3) -/* ARTPEC-3 */ -#define DMA_OUT_NBR0 SYNC_SER_TX_DMA_NBR -#define DMA_IN_NBR0 SYNC_SER_RX_DMA_NBR -#define PINMUX_SSER0 pinmux_sser -#define SYNCSER_INST0 regi_sser -#define SYNCSER_INTR_VECT0 SSER_INTR_VECT -#define OUT_DMA_INST0 regi_dma6 -#define IN_DMA_INST0 regi_dma7 -#define DMA_OUT_INTR_VECT0 DMA6_INTR_VECT -#define DMA_IN_INTR_VECT0 DMA7_INTR_VECT -#define REQ_DMA_SYNCSER0 dma_sser -#define REQ_DMA_SYNCSER1 dma_sser -#endif - -#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA) -#define PORT0_DMA 1 -#else -#define PORT0_DMA 0 -#endif - -/* The ports */ -static struct sync_port ports[] = { - { - .regi_sser = SYNCSER_INST0, - .regi_dmaout = OUT_DMA_INST0, - .regi_dmain = IN_DMA_INST0, - .use_dma = PORT0_DMA, - .dma_in_intr_vect = DMA_IN_INTR_VECT0, - .dma_out_intr_vect = DMA_OUT_INTR_VECT0, - .dma_in_nbr = DMA_IN_NBR0, - .dma_out_nbr = DMA_OUT_NBR0, - .req_dma = REQ_DMA_SYNCSER0, - .syncser_intr_vect = SYNCSER_INTR_VECT0, - }, -#ifdef CONFIG_ETRAXFS - { - .regi_sser = SYNCSER_INST1, - .regi_dmaout = regi_dma6, - .regi_dmain = regi_dma7, - .use_dma = PORT1_DMA, - .dma_in_intr_vect = DMA_IN_INTR_VECT1, - .dma_out_intr_vect = DMA_OUT_INTR_VECT1, - .dma_in_nbr = DMA_IN_NBR1, - .dma_out_nbr = DMA_OUT_NBR1, - .req_dma = REQ_DMA_SYNCSER1, - .syncser_intr_vect = SYNCSER_INTR_VECT1, - }, -#endif -}; - -#define NBR_PORTS ARRAY_SIZE(ports) - -static const struct file_operations syncser_fops = { - .owner = THIS_MODULE, - .write = sync_serial_write, - .read = sync_serial_read, - .poll = sync_serial_poll, - .unlocked_ioctl = sync_serial_ioctl, - .open = sync_serial_open, - .release = sync_serial_release, - .llseek = noop_llseek, -}; - -static dev_t syncser_first; -static int minor_count = NBR_PORTS; -#define SYNCSER_NAME "syncser" -static struct cdev *syncser_cdev; -static struct class *syncser_class; - -static void sync_serial_start_port(struct sync_port *port) -{ - reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg); - reg_sser_rw_tr_cfg tr_cfg = - REG_RD(sser, port->regi_sser, rw_tr_cfg); - reg_sser_rw_rec_cfg rec_cfg = - REG_RD(sser, port->regi_sser, rw_rec_cfg); - cfg.en = regk_sser_yes; - tr_cfg.tr_en = regk_sser_yes; - rec_cfg.rec_en = regk_sser_yes; - REG_WR(sser, port->regi_sser, rw_cfg, cfg); - REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); - REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); - port->started = 1; -} - -static void __init initialize_port(int portnbr) -{ - struct sync_port *port = &ports[portnbr]; - reg_sser_rw_cfg cfg = { 0 }; - reg_sser_rw_frm_cfg frm_cfg = { 0 }; - reg_sser_rw_tr_cfg tr_cfg = { 0 }; - reg_sser_rw_rec_cfg rec_cfg = { 0 }; - - DEBUG(pr_info("Init sync serial port %d\n", portnbr)); - - port->port_nbr = portnbr; - port->init_irqs = no_irq_setup; - - port->out_rd_ptr = port->out_buffer; - port->out_buf_count = 0; - - port->output = 1; - port->input = 0; - - port->readp = port->flip; - port->writep = port->flip; - port->in_buffer_size = IN_BUFFER_SIZE; - port->in_buffer_len = 0; - port->inbufchunk = IN_DESCR_SIZE; - - port->read_ts_idx = 0; - port->write_ts_idx = 0; - - init_waitqueue_head(&port->out_wait_q); - init_waitqueue_head(&port->in_wait_q); - - spin_lock_init(&port->lock); - - cfg.out_clk_src = regk_sser_intern_clk; - cfg.out_clk_pol = regk_sser_pos; - cfg.clk_od_mode = regk_sser_no; - cfg.clk_dir = regk_sser_out; - cfg.gate_clk = regk_sser_no; - cfg.base_freq = regk_sser_f29_493; - cfg.clk_div = 256; - REG_WR(sser, port->regi_sser, rw_cfg, cfg); - - frm_cfg.wordrate = DEFAULT_WORD_RATE; - frm_cfg.type = regk_sser_edge; - frm_cfg.frame_pin_dir = regk_sser_out; - frm_cfg.frame_pin_use = regk_sser_frm; - frm_cfg.status_pin_dir = regk_sser_in; - frm_cfg.status_pin_use = regk_sser_hold; - frm_cfg.out_on = regk_sser_tr; - frm_cfg.tr_delay = 1; - REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg); - - tr_cfg.urun_stop = regk_sser_no; - tr_cfg.sample_size = 7; - tr_cfg.sh_dir = regk_sser_msbfirst; - tr_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no; -#if 0 - tr_cfg.rate_ctrl = regk_sser_bulk; - tr_cfg.data_pin_use = regk_sser_dout; -#else - tr_cfg.rate_ctrl = regk_sser_iso; - tr_cfg.data_pin_use = regk_sser_dout; -#endif - tr_cfg.bulk_wspace = 1; - REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); - - rec_cfg.sample_size = 7; - rec_cfg.sh_dir = regk_sser_msbfirst; - rec_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no; - rec_cfg.fifo_thr = regk_sser_inf; - REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); - -#ifdef SYNC_SER_DMA - { - int i; - /* Setup the descriptor ring for dma out/transmit. */ - for (i = 0; i < NBR_OUT_DESCR; i++) { - dma_descr_data *descr = &port->out_descr[i]; - descr->wait = 0; - descr->intr = 1; - descr->eol = 0; - descr->out_eop = 0; - descr->next = - (dma_descr_data *)virt_to_phys(&descr[i+1]); - } - } - - /* Create a ring from the list. */ - port->out_descr[NBR_OUT_DESCR-1].next = - (dma_descr_data *)virt_to_phys(&port->out_descr[0]); - - /* Setup context for traversing the ring. */ - port->active_tr_descr = &port->out_descr[0]; - port->prev_tr_descr = &port->out_descr[NBR_OUT_DESCR-1]; - port->catch_tr_descr = &port->out_descr[0]; -#endif -} - -static inline int sync_data_avail(struct sync_port *port) -{ - return port->in_buffer_len; -} - -static int sync_serial_open(struct inode *inode, struct file *file) -{ - int ret = 0; - int dev = iminor(inode); - struct sync_port *port; -#ifdef SYNC_SER_DMA - reg_dma_rw_cfg cfg = { .en = regk_dma_yes }; - reg_dma_rw_intr_mask intr_mask = { .data = regk_dma_yes }; -#endif - - DEBUG(pr_debug("Open sync serial port %d\n", dev)); - - if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) { - DEBUG(pr_info("Invalid minor %d\n", dev)); - return -ENODEV; - } - port = &ports[dev]; - /* Allow open this device twice (assuming one reader and one writer) */ - if (port->busy == 2) { - DEBUG(pr_info("syncser%d is busy\n", dev)); - return -EBUSY; - } - - mutex_lock(&sync_serial_mutex); - - /* Clear any stale date left in the flip buffer */ - port->readp = port->writep = port->flip; - port->in_buffer_len = 0; - port->read_ts_idx = 0; - port->write_ts_idx = 0; - - if (port->init_irqs != no_irq_setup) { - /* Init only on first call. */ - port->busy++; - mutex_unlock(&sync_serial_mutex); - return 0; - } - if (port->use_dma) { -#ifdef SYNC_SER_DMA - const char *tmp; - DEBUG(pr_info("Using DMA for syncser%d\n", dev)); - - tmp = dev == 0 ? "syncser0 tx" : "syncser1 tx"; - if (request_irq(port->dma_out_intr_vect, tr_interrupt, 0, - tmp, port)) { - pr_err("Can't alloc syncser%d TX IRQ", dev); - ret = -EBUSY; - goto unlock_and_exit; - } - if (artpec_request_dma(port->dma_out_nbr, tmp, - DMA_VERBOSE_ON_ERROR, 0, port->req_dma)) { - free_irq(port->dma_out_intr_vect, port); - pr_err("Can't alloc syncser%d TX DMA", dev); - ret = -EBUSY; - goto unlock_and_exit; - } - tmp = dev == 0 ? "syncser0 rx" : "syncser1 rx"; - if (request_irq(port->dma_in_intr_vect, rx_interrupt, 0, - tmp, port)) { - artpec_free_dma(port->dma_out_nbr); - free_irq(port->dma_out_intr_vect, port); - pr_err("Can't alloc syncser%d RX IRQ", dev); - ret = -EBUSY; - goto unlock_and_exit; - } - if (artpec_request_dma(port->dma_in_nbr, tmp, - DMA_VERBOSE_ON_ERROR, 0, port->req_dma)) { - artpec_free_dma(port->dma_out_nbr); - free_irq(port->dma_out_intr_vect, port); - free_irq(port->dma_in_intr_vect, port); - pr_err("Can't alloc syncser%d RX DMA", dev); - ret = -EBUSY; - goto unlock_and_exit; - } - /* Enable DMAs */ - REG_WR(dma, port->regi_dmain, rw_cfg, cfg); - REG_WR(dma, port->regi_dmaout, rw_cfg, cfg); - /* Enable DMA IRQs */ - REG_WR(dma, port->regi_dmain, rw_intr_mask, intr_mask); - REG_WR(dma, port->regi_dmaout, rw_intr_mask, intr_mask); - /* Set up wordsize = 1 for DMAs. */ - DMA_WR_CMD(port->regi_dmain, regk_dma_set_w_size1); - DMA_WR_CMD(port->regi_dmaout, regk_dma_set_w_size1); - - start_dma_in(port); - port->init_irqs = dma_irq_setup; -#endif - } else { /* !port->use_dma */ -#ifdef SYNC_SER_MANUAL - const char *tmp = dev == 0 ? "syncser0 manual irq" : - "syncser1 manual irq"; - if (request_irq(port->syncser_intr_vect, manual_interrupt, - 0, tmp, port)) { - pr_err("Can't alloc syncser%d manual irq", - dev); - ret = -EBUSY; - goto unlock_and_exit; - } - port->init_irqs = manual_irq_setup; -#else - panic("sync_serial: Manual mode not supported\n"); -#endif /* SYNC_SER_MANUAL */ - } - port->busy++; - ret = 0; - -unlock_and_exit: - mutex_unlock(&sync_serial_mutex); - return ret; -} - -static int sync_serial_release(struct inode *inode, struct file *file) -{ - int dev = iminor(inode); - struct sync_port *port; - - if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) { - DEBUG(pr_info("Invalid minor %d\n", dev)); - return -ENODEV; - } - port = &ports[dev]; - if (port->busy) - port->busy--; - if (!port->busy) - /* XXX */; - return 0; -} - -static __poll_t sync_serial_poll(struct file *file, poll_table *wait) -{ - int dev = iminor(file_inode(file)); - __poll_t mask = 0; - struct sync_port *port; - DEBUGPOLL( - static __poll_t prev_mask; - ); - - port = &ports[dev]; - - if (!port->started) - sync_serial_start_port(port); - - poll_wait(file, &port->out_wait_q, wait); - poll_wait(file, &port->in_wait_q, wait); - - /* No active transfer, descriptors are available */ - if (port->output && !port->tr_running) - mask |= EPOLLOUT | EPOLLWRNORM; - - /* Descriptor and buffer space available. */ - if (port->output && - port->active_tr_descr != port->catch_tr_descr && - port->out_buf_count < OUT_BUFFER_SIZE) - mask |= EPOLLOUT | EPOLLWRNORM; - - /* At least an inbufchunk of data */ - if (port->input && sync_data_avail(port) >= port->inbufchunk) - mask |= EPOLLIN | EPOLLRDNORM; - - DEBUGPOLL( - if (mask != prev_mask) - pr_info("sync_serial_poll: mask 0x%08X %s %s\n", - mask, - mask & EPOLLOUT ? "POLLOUT" : "", - mask & EPOLLIN ? "POLLIN" : ""); - prev_mask = mask; - ); - return mask; -} - -static ssize_t __sync_serial_read(struct file *file, - char __user *buf, - size_t count, - loff_t *ppos, - struct timespec *ts) -{ - unsigned long flags; - int dev = MINOR(file_inode(file)->i_rdev); - int avail; - struct sync_port *port; - unsigned char *start; - unsigned char *end; - - if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) { - DEBUG(pr_info("Invalid minor %d\n", dev)); - return -ENODEV; - } - port = &ports[dev]; - - if (!port->started) - sync_serial_start_port(port); - - /* Calculate number of available bytes */ - /* Save pointers to avoid that they are modified by interrupt */ - spin_lock_irqsave(&port->lock, flags); - start = port->readp; - end = port->writep; - spin_unlock_irqrestore(&port->lock, flags); - - while ((start == end) && !port->in_buffer_len) { - if (file->f_flags & O_NONBLOCK) - return -EAGAIN; - - wait_event_interruptible(port->in_wait_q, - !(start == end && !port->full)); - - if (signal_pending(current)) - return -EINTR; - - spin_lock_irqsave(&port->lock, flags); - start = port->readp; - end = port->writep; - spin_unlock_irqrestore(&port->lock, flags); - } - - DEBUGREAD(pr_info("R%d c %d ri %u wi %u /%u\n", - dev, count, - start - port->flip, end - port->flip, - port->in_buffer_size)); - - /* Lazy read, never return wrapped data. */ - if (end > start) - avail = end - start; - else - avail = port->flip + port->in_buffer_size - start; - - count = count > avail ? avail : count; - if (copy_to_user(buf, start, count)) - return -EFAULT; - - /* If timestamp requested, find timestamp of first returned byte - * and copy it. - * N.B: Applications that request timstamps MUST read data in - * chunks that are multiples of IN_DESCR_SIZE. - * Otherwise the timestamps will not be aligned to the data read. - */ - if (ts != NULL) { - int idx = port->read_ts_idx; - memcpy(ts, &port->timestamp[idx], sizeof(struct timespec)); - port->read_ts_idx += count / IN_DESCR_SIZE; - if (port->read_ts_idx >= NBR_IN_DESCR) - port->read_ts_idx = 0; - } - - spin_lock_irqsave(&port->lock, flags); - port->readp += count; - /* Check for wrap */ - if (port->readp >= port->flip + port->in_buffer_size) - port->readp = port->flip; - port->in_buffer_len -= count; - port->full = 0; - spin_unlock_irqrestore(&port->lock, flags); - - DEBUGREAD(pr_info("r %d\n", count)); - - return count; -} - -static ssize_t sync_serial_input(struct file *file, unsigned long arg) -{ - struct ssp_request req; - int count; - int ret; - - /* Copy the request structure from user-mode. */ - ret = copy_from_user(&req, (struct ssp_request __user *)arg, - sizeof(struct ssp_request)); - - if (ret) { - DEBUG(pr_info("sync_serial_input copy from user failed\n")); - return -EFAULT; - } - - /* To get the timestamps aligned, make sure that 'len' - * is a multiple of IN_DESCR_SIZE. - */ - if ((req.len % IN_DESCR_SIZE) != 0) { - DEBUG(pr_info("sync_serial: req.len %x, IN_DESCR_SIZE %x\n", - req.len, IN_DESCR_SIZE)); - return -EFAULT; - } - - /* Do the actual read. */ - /* Note that req.buf is actually a pointer to user space. */ - count = __sync_serial_read(file, req.buf, req.len, - NULL, &req.ts); - - if (count < 0) { - DEBUG(pr_info("sync_serial_input read failed\n")); - return count; - } - - /* Copy the request back to user-mode. */ - ret = copy_to_user((struct ssp_request __user *)arg, &req, - sizeof(struct ssp_request)); - - if (ret) { - DEBUG(pr_info("syncser input copy2user failed\n")); - return -EFAULT; - } - - /* Return the number of bytes read. */ - return count; -} - - -static int sync_serial_ioctl_unlocked(struct file *file, - unsigned int cmd, unsigned long arg) -{ - int return_val = 0; - int dma_w_size = regk_dma_set_w_size1; - int dev = iminor(file_inode(file)); - struct sync_port *port; - reg_sser_rw_tr_cfg tr_cfg; - reg_sser_rw_rec_cfg rec_cfg; - reg_sser_rw_frm_cfg frm_cfg; - reg_sser_rw_cfg gen_cfg; - reg_sser_rw_intr_mask intr_mask; - - if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) { - DEBUG(pr_info("Invalid minor %d\n", dev)); - return -1; - } - - if (cmd == SSP_INPUT) - return sync_serial_input(file, arg); - - port = &ports[dev]; - spin_lock_irq(&port->lock); - - tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg); - rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg); - frm_cfg = REG_RD(sser, port->regi_sser, rw_frm_cfg); - gen_cfg = REG_RD(sser, port->regi_sser, rw_cfg); - intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask); - - switch (cmd) { - case SSP_SPEED: - if (GET_SPEED(arg) == CODEC) { - unsigned int freq; - - gen_cfg.base_freq = regk_sser_f32; - - /* Clock divider will internally be - * gen_cfg.clk_div + 1. - */ - - freq = GET_FREQ(arg); - switch (freq) { - case FREQ_32kHz: - case FREQ_64kHz: - case FREQ_128kHz: - case FREQ_256kHz: - gen_cfg.clk_div = 125 * - (1 << (freq - FREQ_256kHz)) - 1; - break; - case FREQ_512kHz: - gen_cfg.clk_div = 62; - break; - case FREQ_1MHz: - case FREQ_2MHz: - case FREQ_4MHz: - gen_cfg.clk_div = 8 * (1 << freq) - 1; - break; - } - } else if (GET_SPEED(arg) == CODEC_f32768) { - gen_cfg.base_freq = regk_sser_f32_768; - switch (GET_FREQ(arg)) { - case FREQ_4096kHz: - gen_cfg.clk_div = 7; - break; - default: - spin_unlock_irq(&port->lock); - return -EINVAL; - } - } else { - gen_cfg.base_freq = regk_sser_f29_493; - switch (GET_SPEED(arg)) { - case SSP150: - gen_cfg.clk_div = 29493000 / (150 * 8) - 1; - break; - case SSP300: - gen_cfg.clk_div = 29493000 / (300 * 8) - 1; - break; - case SSP600: - gen_cfg.clk_div = 29493000 / (600 * 8) - 1; - break; - case SSP1200: - gen_cfg.clk_div = 29493000 / (1200 * 8) - 1; - break; - case SSP2400: - gen_cfg.clk_div = 29493000 / (2400 * 8) - 1; - break; - case SSP4800: - gen_cfg.clk_div = 29493000 / (4800 * 8) - 1; - break; - case SSP9600: - gen_cfg.clk_div = 29493000 / (9600 * 8) - 1; - break; - case SSP19200: - gen_cfg.clk_div = 29493000 / (19200 * 8) - 1; - break; - case SSP28800: - gen_cfg.clk_div = 29493000 / (28800 * 8) - 1; - break; - case SSP57600: - gen_cfg.clk_div = 29493000 / (57600 * 8) - 1; - break; - case SSP115200: - gen_cfg.clk_div = 29493000 / (115200 * 8) - 1; - break; - case SSP230400: - gen_cfg.clk_div = 29493000 / (230400 * 8) - 1; - break; - case SSP460800: - gen_cfg.clk_div = 29493000 / (460800 * 8) - 1; - break; - case SSP921600: - gen_cfg.clk_div = 29493000 / (921600 * 8) - 1; - break; - case SSP3125000: - gen_cfg.base_freq = regk_sser_f100; - gen_cfg.clk_div = 100000000 / (3125000 * 8) - 1; - break; - - } - } - frm_cfg.wordrate = GET_WORD_RATE(arg); - - break; - case SSP_MODE: - switch (arg) { - case MASTER_OUTPUT: - port->output = 1; - port->input = 0; - frm_cfg.out_on = regk_sser_tr; - frm_cfg.frame_pin_dir = regk_sser_out; - gen_cfg.clk_dir = regk_sser_out; - break; - case SLAVE_OUTPUT: - port->output = 1; - port->input = 0; - frm_cfg.frame_pin_dir = regk_sser_in; - gen_cfg.clk_dir = regk_sser_in; - break; - case MASTER_INPUT: - port->output = 0; - port->input = 1; - frm_cfg.frame_pin_dir = regk_sser_out; - frm_cfg.out_on = regk_sser_intern_tb; - gen_cfg.clk_dir = regk_sser_out; - break; - case SLAVE_INPUT: - port->output = 0; - port->input = 1; - frm_cfg.frame_pin_dir = regk_sser_in; - gen_cfg.clk_dir = regk_sser_in; - break; - case MASTER_BIDIR: - port->output = 1; - port->input = 1; - frm_cfg.frame_pin_dir = regk_sser_out; - frm_cfg.out_on = regk_sser_intern_tb; - gen_cfg.clk_dir = regk_sser_out; - break; - case SLAVE_BIDIR: - port->output = 1; - port->input = 1; - frm_cfg.frame_pin_dir = regk_sser_in; - gen_cfg.clk_dir = regk_sser_in; - break; - default: - spin_unlock_irq(&port->lock); - return -EINVAL; - } - if (!port->use_dma || arg == MASTER_OUTPUT || - arg == SLAVE_OUTPUT) - intr_mask.rdav = regk_sser_yes; - break; - case SSP_FRAME_SYNC: - if (arg & NORMAL_SYNC) { - frm_cfg.rec_delay = 1; - frm_cfg.tr_delay = 1; - } else if (arg & EARLY_SYNC) - frm_cfg.rec_delay = frm_cfg.tr_delay = 0; - else if (arg & LATE_SYNC) { - frm_cfg.tr_delay = 2; - frm_cfg.rec_delay = 2; - } else if (arg & SECOND_WORD_SYNC) { - frm_cfg.rec_delay = 7; - frm_cfg.tr_delay = 1; - } - - tr_cfg.bulk_wspace = frm_cfg.tr_delay; - frm_cfg.early_wend = regk_sser_yes; - if (arg & BIT_SYNC) - frm_cfg.type = regk_sser_edge; - else if (arg & WORD_SYNC) - frm_cfg.type = regk_sser_level; - else if (arg & EXTENDED_SYNC) - frm_cfg.early_wend = regk_sser_no; - - if (arg & SYNC_ON) - frm_cfg.frame_pin_use = regk_sser_frm; - else if (arg & SYNC_OFF) - frm_cfg.frame_pin_use = regk_sser_gio0; - - dma_w_size = regk_dma_set_w_size2; - if (arg & WORD_SIZE_8) { - rec_cfg.sample_size = tr_cfg.sample_size = 7; - dma_w_size = regk_dma_set_w_size1; - } else if (arg & WORD_SIZE_12) - rec_cfg.sample_size = tr_cfg.sample_size = 11; - else if (arg & WORD_SIZE_16) - rec_cfg.sample_size = tr_cfg.sample_size = 15; - else if (arg & WORD_SIZE_24) - rec_cfg.sample_size = tr_cfg.sample_size = 23; - else if (arg & WORD_SIZE_32) - rec_cfg.sample_size = tr_cfg.sample_size = 31; - - if (arg & BIT_ORDER_MSB) - rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst; - else if (arg & BIT_ORDER_LSB) - rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_lsbfirst; - - if (arg & FLOW_CONTROL_ENABLE) { - frm_cfg.status_pin_use = regk_sser_frm; - rec_cfg.fifo_thr = regk_sser_thr16; - } else if (arg & FLOW_CONTROL_DISABLE) { - frm_cfg.status_pin_use = regk_sser_gio0; - rec_cfg.fifo_thr = regk_sser_inf; - } - - if (arg & CLOCK_NOT_GATED) - gen_cfg.gate_clk = regk_sser_no; - else if (arg & CLOCK_GATED) - gen_cfg.gate_clk = regk_sser_yes; - - break; - case SSP_IPOLARITY: - /* NOTE!! negedge is considered NORMAL */ - if (arg & CLOCK_NORMAL) - rec_cfg.clk_pol = regk_sser_neg; - else if (arg & CLOCK_INVERT) - rec_cfg.clk_pol = regk_sser_pos; - - if (arg & FRAME_NORMAL) - frm_cfg.level = regk_sser_pos_hi; - else if (arg & FRAME_INVERT) - frm_cfg.level = regk_sser_neg_lo; - - if (arg & STATUS_NORMAL) - gen_cfg.hold_pol = regk_sser_pos; - else if (arg & STATUS_INVERT) - gen_cfg.hold_pol = regk_sser_neg; - break; - case SSP_OPOLARITY: - if (arg & CLOCK_NORMAL) - gen_cfg.out_clk_pol = regk_sser_pos; - else if (arg & CLOCK_INVERT) - gen_cfg.out_clk_pol = regk_sser_neg; - - if (arg & FRAME_NORMAL) - frm_cfg.level = regk_sser_pos_hi; - else if (arg & FRAME_INVERT) - frm_cfg.level = regk_sser_neg_lo; - - if (arg & STATUS_NORMAL) - gen_cfg.hold_pol = regk_sser_pos; - else if (arg & STATUS_INVERT) - gen_cfg.hold_pol = regk_sser_neg; - break; - case SSP_SPI: - rec_cfg.fifo_thr = regk_sser_inf; - rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst; - rec_cfg.sample_size = tr_cfg.sample_size = 7; - frm_cfg.frame_pin_use = regk_sser_frm; - frm_cfg.type = regk_sser_level; - frm_cfg.tr_delay = 1; - frm_cfg.level = regk_sser_neg_lo; - if (arg & SPI_SLAVE) { - rec_cfg.clk_pol = regk_sser_neg; - gen_cfg.clk_dir = regk_sser_in; - port->input = 1; - port->output = 0; - } else { - gen_cfg.out_clk_pol = regk_sser_pos; - port->input = 0; - port->output = 1; - gen_cfg.clk_dir = regk_sser_out; - } - break; - case SSP_INBUFCHUNK: - break; - default: - return_val = -1; - } - - - if (port->started) { - rec_cfg.rec_en = port->input; - gen_cfg.en = (port->output | port->input); - } - - REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); - REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); - REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg); - REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask); - REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg); - - - if (cmd == SSP_FRAME_SYNC && (arg & (WORD_SIZE_8 | WORD_SIZE_12 | - WORD_SIZE_16 | WORD_SIZE_24 | WORD_SIZE_32))) { - int en = gen_cfg.en; - gen_cfg.en = 0; - REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg); - /* ##### Should DMA be stoped before we change dma size? */ - DMA_WR_CMD(port->regi_dmain, dma_w_size); - DMA_WR_CMD(port->regi_dmaout, dma_w_size); - gen_cfg.en = en; - REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg); - } - - spin_unlock_irq(&port->lock); - return return_val; -} - -static long sync_serial_ioctl(struct file *file, - unsigned int cmd, unsigned long arg) -{ - long ret; - - mutex_lock(&sync_serial_mutex); - ret = sync_serial_ioctl_unlocked(file, cmd, arg); - mutex_unlock(&sync_serial_mutex); - - return ret; -} - -/* NOTE: sync_serial_write does not support concurrency */ -static ssize_t sync_serial_write(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - int dev = iminor(file_inode(file)); - DECLARE_WAITQUEUE(wait, current); - struct sync_port *port; - int trunc_count; - unsigned long flags; - int bytes_free; - int out_buf_count; - - unsigned char *rd_ptr; /* First allocated byte in the buffer */ - unsigned char *wr_ptr; /* First free byte in the buffer */ - unsigned char *buf_stop_ptr; /* Last byte + 1 */ - - if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) { - DEBUG(pr_info("Invalid minor %d\n", dev)); - return -ENODEV; - } - port = &ports[dev]; - - /* |<- OUT_BUFFER_SIZE ->| - * |<- out_buf_count ->| - * |<- trunc_count ->| ...->| - * ______________________________________________________ - * | free | data | free | - * |_________|___________________|________________________| - * ^ rd_ptr ^ wr_ptr - */ - DEBUGWRITE(pr_info("W d%d c %u a: %p c: %p\n", - port->port_nbr, count, port->active_tr_descr, - port->catch_tr_descr)); - - /* Read variables that may be updated by interrupts */ - spin_lock_irqsave(&port->lock, flags); - rd_ptr = port->out_rd_ptr; - out_buf_count = port->out_buf_count; - spin_unlock_irqrestore(&port->lock, flags); - - /* Check if resources are available */ - if (port->tr_running && - ((port->use_dma && port->active_tr_descr == port->catch_tr_descr) || - out_buf_count >= OUT_BUFFER_SIZE)) { - DEBUGWRITE(pr_info("sser%d full\n", dev)); - return -EAGAIN; - } - - buf_stop_ptr = port->out_buffer + OUT_BUFFER_SIZE; - - /* Determine pointer to the first free byte, before copying. */ - wr_ptr = rd_ptr + out_buf_count; - if (wr_ptr >= buf_stop_ptr) - wr_ptr -= OUT_BUFFER_SIZE; - - /* If we wrap the ring buffer, let the user space program handle it by - * truncating the data. This could be more elegant, small buffer - * fragments may occur. - */ - bytes_free = OUT_BUFFER_SIZE - out_buf_count; - if (wr_ptr + bytes_free > buf_stop_ptr) - bytes_free = buf_stop_ptr - wr_ptr; - trunc_count = (count < bytes_free) ? count : bytes_free; - - if (copy_from_user(wr_ptr, buf, trunc_count)) - return -EFAULT; - - DEBUGOUTBUF(pr_info("%-4d + %-4d = %-4d %p %p %p\n", - out_buf_count, trunc_count, - port->out_buf_count, port->out_buffer, - wr_ptr, buf_stop_ptr)); - - /* Make sure transmitter/receiver is running */ - if (!port->started) { - reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg); - reg_sser_rw_rec_cfg rec_cfg = - REG_RD(sser, port->regi_sser, rw_rec_cfg); - cfg.en = regk_sser_yes; - rec_cfg.rec_en = port->input; - REG_WR(sser, port->regi_sser, rw_cfg, cfg); - REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); - port->started = 1; - } - - /* Setup wait if blocking */ - if (!(file->f_flags & O_NONBLOCK)) { - add_wait_queue(&port->out_wait_q, &wait); - set_current_state(TASK_INTERRUPTIBLE); - } - - spin_lock_irqsave(&port->lock, flags); - port->out_buf_count += trunc_count; - if (port->use_dma) { -#ifdef SYNC_SER_DMA - start_dma_out(port, wr_ptr, trunc_count); -#endif - } else if (!port->tr_running) { -#ifdef SYNC_SER_MANUAL - reg_sser_rw_intr_mask intr_mask; - intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask); - /* Start sender by writing data */ - send_word(port); - /* and enable transmitter ready IRQ */ - intr_mask.trdy = 1; - REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask); -#endif - } - spin_unlock_irqrestore(&port->lock, flags); - - /* Exit if non blocking */ - if (file->f_flags & O_NONBLOCK) { - DEBUGWRITE(pr_info("w d%d c %u %08x\n", - port->port_nbr, trunc_count, - REG_RD_INT(dma, port->regi_dmaout, r_intr))); - return trunc_count; - } - - schedule(); - remove_wait_queue(&port->out_wait_q, &wait); - - if (signal_pending(current)) - return -EINTR; - - DEBUGWRITE(pr_info("w d%d c %u\n", port->port_nbr, trunc_count)); - return trunc_count; -} - -static ssize_t sync_serial_read(struct file *file, char __user *buf, - size_t count, loff_t *ppos) -{ - return __sync_serial_read(file, buf, count, ppos, NULL); -} - -#ifdef SYNC_SER_MANUAL -static void send_word(struct sync_port *port) -{ - reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg); - reg_sser_rw_tr_data tr_data = {0}; - - switch (tr_cfg.sample_size) { - case 8: - port->out_buf_count--; - tr_data.data = *port->out_rd_ptr++; - REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); - if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) - port->out_rd_ptr = port->out_buffer; - break; - case 12: - { - int data = (*port->out_rd_ptr++) << 8; - data |= *port->out_rd_ptr++; - port->out_buf_count -= 2; - tr_data.data = data; - REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); - if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) - port->out_rd_ptr = port->out_buffer; - break; - } - case 16: - port->out_buf_count -= 2; - tr_data.data = *(unsigned short *)port->out_rd_ptr; - REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); - port->out_rd_ptr += 2; - if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) - port->out_rd_ptr = port->out_buffer; - break; - case 24: - port->out_buf_count -= 3; - tr_data.data = *(unsigned short *)port->out_rd_ptr; - REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); - port->out_rd_ptr += 2; - tr_data.data = *port->out_rd_ptr++; - REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); - if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) - port->out_rd_ptr = port->out_buffer; - break; - case 32: - port->out_buf_count -= 4; - tr_data.data = *(unsigned short *)port->out_rd_ptr; - REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); - port->out_rd_ptr += 2; - tr_data.data = *(unsigned short *)port->out_rd_ptr; - REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); - port->out_rd_ptr += 2; - if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) - port->out_rd_ptr = port->out_buffer; - break; - } -} -#endif - -#ifdef SYNC_SER_DMA -static void start_dma_out(struct sync_port *port, const char *data, int count) -{ - port->active_tr_descr->buf = (char *)virt_to_phys((char *)data); - port->active_tr_descr->after = port->active_tr_descr->buf + count; - port->active_tr_descr->intr = 1; - - port->active_tr_descr->eol = 1; - port->prev_tr_descr->eol = 0; - - DEBUGTRDMA(pr_info("Inserting eolr:%p eol@:%p\n", - port->prev_tr_descr, port->active_tr_descr)); - port->prev_tr_descr = port->active_tr_descr; - port->active_tr_descr = phys_to_virt((int)port->active_tr_descr->next); - - if (!port->tr_running) { - reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, - rw_tr_cfg); - - port->out_context.next = NULL; - port->out_context.saved_data = - (dma_descr_data *)virt_to_phys(port->prev_tr_descr); - port->out_context.saved_data_buf = port->prev_tr_descr->buf; - - DMA_START_CONTEXT(port->regi_dmaout, - virt_to_phys((char *)&port->out_context)); - - tr_cfg.tr_en = regk_sser_yes; - REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); - DEBUGTRDMA(pr_info("dma s\n");); - } else { - DMA_CONTINUE_DATA(port->regi_dmaout); - DEBUGTRDMA(pr_info("dma c\n");); - } - - port->tr_running = 1; -} - -static void start_dma_in(struct sync_port *port) -{ - int i; - char *buf; - unsigned long flags; - spin_lock_irqsave(&port->lock, flags); - port->writep = port->flip; - spin_unlock_irqrestore(&port->lock, flags); - - buf = (char *)virt_to_phys(port->in_buffer); - for (i = 0; i < NBR_IN_DESCR; i++) { - port->in_descr[i].buf = buf; - port->in_descr[i].after = buf + port->inbufchunk; - port->in_descr[i].intr = 1; - port->in_descr[i].next = - (dma_descr_data *)virt_to_phys(&port->in_descr[i+1]); - port->in_descr[i].buf = buf; - buf += port->inbufchunk; - } - /* Link the last descriptor to the first */ - port->in_descr[i-1].next = - (dma_descr_data *)virt_to_phys(&port->in_descr[0]); - port->in_descr[i-1].eol = regk_sser_yes; - port->next_rx_desc = &port->in_descr[0]; - port->prev_rx_desc = &port->in_descr[NBR_IN_DESCR - 1]; - port->in_context.saved_data = - (dma_descr_data *)virt_to_phys(&port->in_descr[0]); - port->in_context.saved_data_buf = port->in_descr[0].buf; - DMA_START_CONTEXT(port->regi_dmain, virt_to_phys(&port->in_context)); -} - -static irqreturn_t tr_interrupt(int irq, void *dev_id) -{ - reg_dma_r_masked_intr masked; - reg_dma_rw_ack_intr ack_intr = { .data = regk_dma_yes }; - reg_dma_rw_stat stat; - int i; - int found = 0; - int stop_sser = 0; - - for (i = 0; i < NBR_PORTS; i++) { - struct sync_port *port = &ports[i]; - if (!port->enabled || !port->use_dma) - continue; - - /* IRQ active for the port? */ - masked = REG_RD(dma, port->regi_dmaout, r_masked_intr); - if (!masked.data) - continue; - - found = 1; - - /* Check if we should stop the DMA transfer */ - stat = REG_RD(dma, port->regi_dmaout, rw_stat); - if (stat.list_state == regk_dma_data_at_eol) - stop_sser = 1; - - /* Clear IRQ */ - REG_WR(dma, port->regi_dmaout, rw_ack_intr, ack_intr); - - if (!stop_sser) { - /* The DMA has completed a descriptor, EOL was not - * encountered, so step relevant descriptor and - * datapointers forward. */ - int sent; - sent = port->catch_tr_descr->after - - port->catch_tr_descr->buf; - DEBUGTXINT(pr_info("%-4d - %-4d = %-4d\t" - "in descr %p (ac: %p)\n", - port->out_buf_count, sent, - port->out_buf_count - sent, - port->catch_tr_descr, - port->active_tr_descr);); - port->out_buf_count -= sent; - port->catch_tr_descr = - phys_to_virt((int) port->catch_tr_descr->next); - port->out_rd_ptr = - phys_to_virt((int) port->catch_tr_descr->buf); - } else { - reg_sser_rw_tr_cfg tr_cfg; - int j, sent; - /* EOL handler. - * Note that if an EOL was encountered during the irq - * locked section of sync_ser_write the DMA will be - * restarted and the eol flag will be cleared. - * The remaining descriptors will be traversed by - * the descriptor interrupts as usual. - */ - j = 0; - while (!port->catch_tr_descr->eol) { - sent = port->catch_tr_descr->after - - port->catch_tr_descr->buf; - DEBUGOUTBUF(pr_info( - "traversing descr %p -%d (%d)\n", - port->catch_tr_descr, - sent, - port->out_buf_count)); - port->out_buf_count -= sent; - port->catch_tr_descr = phys_to_virt( - (int)port->catch_tr_descr->next); - j++; - if (j >= NBR_OUT_DESCR) { - /* TODO: Reset and recover */ - panic("sync_serial: missing eol"); - } - } - sent = port->catch_tr_descr->after - - port->catch_tr_descr->buf; - DEBUGOUTBUF(pr_info("eol at descr %p -%d (%d)\n", - port->catch_tr_descr, - sent, - port->out_buf_count)); - - port->out_buf_count -= sent; - - /* Update read pointer to first free byte, we - * may already be writing data there. */ - port->out_rd_ptr = - phys_to_virt((int) port->catch_tr_descr->after); - if (port->out_rd_ptr > port->out_buffer + - OUT_BUFFER_SIZE) - port->out_rd_ptr = port->out_buffer; - - tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg); - DEBUGTXINT(pr_info( - "tr_int DMA stop %d, set catch @ %p\n", - port->out_buf_count, - port->active_tr_descr)); - if (port->out_buf_count != 0) - pr_err("sync_ser: buf not empty after eol\n"); - port->catch_tr_descr = port->active_tr_descr; - port->tr_running = 0; - tr_cfg.tr_en = regk_sser_no; - REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); - } - /* wake up the waiting process */ - wake_up_interruptible(&port->out_wait_q); - } - return IRQ_RETVAL(found); -} /* tr_interrupt */ - - -static inline void handle_rx_packet(struct sync_port *port) -{ - int idx; - reg_dma_rw_ack_intr ack_intr = { .data = regk_dma_yes }; - unsigned long flags; - - DEBUGRXINT(pr_info("!")); - spin_lock_irqsave(&port->lock, flags); - - /* If we overrun the user experience is crap regardless if we - * drop new or old data. Its much easier to get it right when - * dropping new data so lets do that. - */ - if ((port->writep + port->inbufchunk <= - port->flip + port->in_buffer_size) && - (port->in_buffer_len + port->inbufchunk < IN_BUFFER_SIZE)) { - memcpy(port->writep, - phys_to_virt((unsigned)port->next_rx_desc->buf), - port->inbufchunk); - port->writep += port->inbufchunk; - if (port->writep >= port->flip + port->in_buffer_size) - port->writep = port->flip; - - /* Timestamp the new data chunk. */ - if (port->write_ts_idx == NBR_IN_DESCR) - port->write_ts_idx = 0; - idx = port->write_ts_idx++; - ktime_get_ts(&port->timestamp[idx]); - port->in_buffer_len += port->inbufchunk; - } - spin_unlock_irqrestore(&port->lock, flags); - - port->next_rx_desc->eol = 1; - port->prev_rx_desc->eol = 0; - /* Cache bug workaround */ - flush_dma_descr(port->prev_rx_desc, 0); - port->prev_rx_desc = port->next_rx_desc; - port->next_rx_desc = phys_to_virt((unsigned)port->next_rx_desc->next); - /* Cache bug workaround */ - flush_dma_descr(port->prev_rx_desc, 1); - /* wake up the waiting process */ - wake_up_interruptible(&port->in_wait_q); - DMA_CONTINUE(port->regi_dmain); - REG_WR(dma, port->regi_dmain, rw_ack_intr, ack_intr); - -} - -static irqreturn_t rx_interrupt(int irq, void *dev_id) -{ - reg_dma_r_masked_intr masked; - - int i; - int found = 0; - - DEBUG(pr_info("rx_interrupt\n")); - - for (i = 0; i < NBR_PORTS; i++) { - struct sync_port *port = &ports[i]; - - if (!port->enabled || !port->use_dma) - continue; - - masked = REG_RD(dma, port->regi_dmain, r_masked_intr); - - if (!masked.data) - continue; - - /* Descriptor interrupt */ - found = 1; - while (REG_RD(dma, port->regi_dmain, rw_data) != - virt_to_phys(port->next_rx_desc)) - handle_rx_packet(port); - } - return IRQ_RETVAL(found); -} /* rx_interrupt */ -#endif /* SYNC_SER_DMA */ - -#ifdef SYNC_SER_MANUAL -static irqreturn_t manual_interrupt(int irq, void *dev_id) -{ - unsigned long flags; - int i; - int found = 0; - reg_sser_r_masked_intr masked; - - for (i = 0; i < NBR_PORTS; i++) { - struct sync_port *port = &ports[i]; - - if (!port->enabled || port->use_dma) - continue; - - masked = REG_RD(sser, port->regi_sser, r_masked_intr); - /* Data received? */ - if (masked.rdav) { - reg_sser_rw_rec_cfg rec_cfg = - REG_RD(sser, port->regi_sser, rw_rec_cfg); - reg_sser_r_rec_data data = REG_RD(sser, - port->regi_sser, r_rec_data); - found = 1; - /* Read data */ - spin_lock_irqsave(&port->lock, flags); - switch (rec_cfg.sample_size) { - case 8: - *port->writep++ = data.data & 0xff; - break; - case 12: - *port->writep = (data.data & 0x0ff0) >> 4; - *(port->writep + 1) = data.data & 0x0f; - port->writep += 2; - break; - case 16: - *(unsigned short *)port->writep = data.data; - port->writep += 2; - break; - case 24: - *(unsigned int *)port->writep = data.data; - port->writep += 3; - break; - case 32: - *(unsigned int *)port->writep = data.data; - port->writep += 4; - break; - } - - /* Wrap? */ - if (port->writep >= port->flip + port->in_buffer_size) - port->writep = port->flip; - if (port->writep == port->readp) { - /* Receive buf overrun, discard oldest data */ - port->readp++; - /* Wrap? */ - if (port->readp >= port->flip + - port->in_buffer_size) - port->readp = port->flip; - } - spin_unlock_irqrestore(&port->lock, flags); - if (sync_data_avail(port) >= port->inbufchunk) - /* Wake up application */ - wake_up_interruptible(&port->in_wait_q); - } - - /* Transmitter ready? */ - if (masked.trdy) { - found = 1; - /* More data to send */ - if (port->out_buf_count > 0) - send_word(port); - else { - /* Transmission finished */ - reg_sser_rw_intr_mask intr_mask; - intr_mask = REG_RD(sser, port->regi_sser, - rw_intr_mask); - intr_mask.trdy = 0; - REG_WR(sser, port->regi_sser, - rw_intr_mask, intr_mask); - /* Wake up application */ - wake_up_interruptible(&port->out_wait_q); - } - } - } - return IRQ_RETVAL(found); -} -#endif - -static int __init etrax_sync_serial_init(void) -{ -#if 1 - /* This code will be removed when we move to udev for all devices. */ - syncser_first = MKDEV(SYNC_SERIAL_MAJOR, 0); - if (register_chrdev_region(syncser_first, minor_count, SYNCSER_NAME)) { - pr_err("Failed to register major %d\n", SYNC_SERIAL_MAJOR); - return -1; - } -#else - /* Allocate dynamic major number. */ - if (alloc_chrdev_region(&syncser_first, 0, minor_count, SYNCSER_NAME)) { - pr_err("Failed to allocate character device region\n"); - return -1; - } -#endif - syncser_cdev = cdev_alloc(); - if (!syncser_cdev) { - pr_err("Failed to allocate cdev for syncser\n"); - unregister_chrdev_region(syncser_first, minor_count); - return -1; - } - cdev_init(syncser_cdev, &syncser_fops); - - /* Create a sysfs class for syncser */ - syncser_class = class_create(THIS_MODULE, "syncser_class"); - if (IS_ERR(syncser_class)) { - pr_err("Failed to create a sysfs class for syncser\n"); - unregister_chrdev_region(syncser_first, minor_count); - cdev_del(syncser_cdev); - return -1; - } - - /* Initialize Ports */ -#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) - if (artpec_pinmux_alloc_fixed(PINMUX_SSER0)) { - pr_warn("Unable to alloc pins for synchronous serial port 0\n"); - unregister_chrdev_region(syncser_first, minor_count); - return -EIO; - } - initialize_port(0); - ports[0].enabled = 1; - /* Register with sysfs so udev can pick it up. */ - device_create(syncser_class, NULL, syncser_first, NULL, - "%s%d", SYNCSER_NAME, 0); -#endif - -#if defined(CONFIG_ETRAXFS) && defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) - if (artpec_pinmux_alloc_fixed(PINMUX_SSER1)) { - pr_warn("Unable to alloc pins for synchronous serial port 1\n"); - unregister_chrdev_region(syncser_first, minor_count); - class_destroy(syncser_class); - return -EIO; - } - initialize_port(1); - ports[1].enabled = 1; - /* Register with sysfs so udev can pick it up. */ - device_create(syncser_class, NULL, syncser_first, NULL, - "%s%d", SYNCSER_NAME, 0); -#endif - - /* Add it to system */ - if (cdev_add(syncser_cdev, syncser_first, minor_count) < 0) { - pr_err("Failed to add syncser as char device\n"); - device_destroy(syncser_class, syncser_first); - class_destroy(syncser_class); - cdev_del(syncser_cdev); - unregister_chrdev_region(syncser_first, minor_count); - return -1; - } - - - pr_info("ARTPEC synchronous serial port (%s: %d, %d)\n", - SYNCSER_NAME, MAJOR(syncser_first), MINOR(syncser_first)); - - return 0; -} - -static void __exit etrax_sync_serial_exit(void) -{ - int i; - device_destroy(syncser_class, syncser_first); - class_destroy(syncser_class); - - if (syncser_cdev) { - cdev_del(syncser_cdev); - unregister_chrdev_region(syncser_first, minor_count); - } - for (i = 0; i < NBR_PORTS; i++) { - struct sync_port *port = &ports[i]; - if (port->init_irqs == dma_irq_setup) { - /* Free dma irqs and dma channels. */ -#ifdef SYNC_SER_DMA - artpec_free_dma(port->dma_in_nbr); - artpec_free_dma(port->dma_out_nbr); - free_irq(port->dma_out_intr_vect, port); - free_irq(port->dma_in_intr_vect, port); -#endif - } else if (port->init_irqs == manual_irq_setup) { - /* Free manual irq. */ - free_irq(port->syncser_intr_vect, port); - } - } - - pr_info("ARTPEC synchronous serial port unregistered\n"); -} - -module_init(etrax_sync_serial_init); -module_exit(etrax_sync_serial_exit); - -MODULE_LICENSE("GPL"); - |