diff options
Diffstat (limited to 'target/linux/amazon/files/drivers/char/ifx_ssc.c')
| -rw-r--r-- | target/linux/amazon/files/drivers/char/ifx_ssc.c | 2121 |
1 files changed, 2121 insertions, 0 deletions
diff --git a/target/linux/amazon/files/drivers/char/ifx_ssc.c b/target/linux/amazon/files/drivers/char/ifx_ssc.c new file mode 100644 index 0000000000..ea01659a94 --- /dev/null +++ b/target/linux/amazon/files/drivers/char/ifx_ssc.c @@ -0,0 +1,2121 @@ +/************************************************** + * + * drivers/ifx/serial/ifx_ssc.c + * + * Driver for IFX_SSC serial ports + * + * Copyright (C) 2004 Infineon Technologies AG + * Author Michael Schoenenborn (IFX COM TI BT) + * + */ +#define IFX_SSC_DRV_VERSION "0.2.1" +/* + ************************************************** + * + * This driver was originally based on the INCA-IP driver, but due to + * fundamental conceptual drawbacks there has been changed a lot. + * + * Based on INCA-IP driver Copyright (c) 2003 Gary Jennejohn <gj@denx.de> + * Based on the VxWorks drivers Copyright (c) 2002, Infineon Technologies. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +// ### TO DO: general issues: +// - power management +// - interrupt handling (direct/indirect) +// - pin/mux-handling (just overall concept due to project dependency) +// - multiple instances capability +// - slave functionality + +/* + * Include section + */ +#ifndef EXPORT_SYMTAB +#define EXPORT_SYMTAB +#endif + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/timer.h> +#include <linux/interrupt.h> +#include <linux/major.h> +#include <linux/string.h> +#include <linux/fs.h> +#include <linux/proc_fs.h> +#include <linux/fcntl.h> +#include <linux/ptrace.h> +#include <linux/mm.h> +#include <linux/ioport.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/spinlock.h> +#include <linux/slab.h> +//#include <linux/poll.h> + +#include <asm/system.h> +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/uaccess.h> +#include <asm/bitops.h> + +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/version.h> + +#include <asm/amazon/amazon.h> +#include <asm/amazon/irq.h> +#include <asm/amazon/ifx_ssc_defines.h> +#include <asm/amazon/ifx_ssc.h> + +#ifdef SSC_FRAME_INT_ENABLE +#undef SSC_FRAME_INT_ENABLE +#endif + +#define not_yet + +#define SPI_VINETIC + +/* + * Deal with CONFIG_MODVERSIONS + */ +#if CONFIG_MODVERSIONS==1 +# include <linux/modversions.h> +#endif + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Michael Schoenenborn"); +MODULE_DESCRIPTION("IFX SSC driver"); +MODULE_SUPPORTED_DEVICE("ifx_ssc"); +MODULE_PARM(maj, "i"); +MODULE_PARM_DESC(maj, "Major device number"); + +/* allow the user to set the major device number */ +static int maj = 0; + + +/* + * This is the per-channel data structure containing pointers, flags + * and variables for the port. This driver supports a maximum of PORT_CNT. + * isp is allocated in ifx_ssc_init() based on the chip version. + */ +static struct ifx_ssc_port *isp; + +/* prototypes for fops */ +static ssize_t ifx_ssc_read(struct file *, char *, size_t, loff_t *); +static ssize_t ifx_ssc_write(struct file *, const char *, size_t, loff_t *); +//static unsigned int ifx_ssc_poll(struct file *, struct poll_table_struct *); +int ifx_ssc_ioctl(struct inode *, struct file *, unsigned int, unsigned long); +int ifx_ssc_open(struct inode *, struct file *); +int ifx_ssc_close(struct inode *, struct file *); + +/* other forward declarations */ +static unsigned int ifx_ssc_get_kernel_clk(struct ifx_ssc_port *info); +static void ifx_ssc_rx_int(int, void *, struct pt_regs *); +static void ifx_ssc_tx_int(int, void *, struct pt_regs *); +static void ifx_ssc_err_int(int, void *, struct pt_regs *); +#ifdef SSC_FRAME_INT_ENABLE +static void ifx_ssc_frm_int(int, void *, struct pt_regs *); +#endif +static void tx_int(struct ifx_ssc_port *); +static int ifx_ssc1_read_proc(char *, char **, off_t, int, int *, void *); +static void ifx_gpio_init(void); +/************************************************************************ + * Function declaration + ************************************************************************/ +//interrupt.c +extern unsigned int amazon_get_fpi_hz(void); +extern void disable_amazon_irq(unsigned int irq_nr); +extern void enable_amazon_irq(unsigned int irq_nr); +extern void mask_and_ack_amazon_irq(unsigned int irq_nr); + + +/*****************************************************************/ +typedef struct { + int (*request)(unsigned int irq, + void (*handler)(int, void *, struct pt_regs *), + unsigned long irqflags, + const char * devname, + void *dev_id); + void (*free)(unsigned int irq, void *dev_id); + void (*enable)(unsigned int irq); + void (*disable)(unsigned int irq); + void (*clear)(unsigned int irq); +} ifx_int_wrapper_t; + +static ifx_int_wrapper_t ifx_int_wrapper = { + request: request_irq, // IM action: enable int + free: free_irq, // IM action: disable int + enable: enable_amazon_irq, + disable: disable_amazon_irq, + clear: mask_and_ack_amazon_irq, + //end: +}; + +/* Fops-struct */ +static struct file_operations ifx_ssc_fops = { + owner: THIS_MODULE, + read: ifx_ssc_read, /* read */ + write: ifx_ssc_write, /* write */ +// poll: ifx_ssc_poll, /* poll */ + ioctl: ifx_ssc_ioctl, /* ioctl */ + open: ifx_ssc_open, /* open */ + release: ifx_ssc_close, /* release */ +}; + + +static inline unsigned int ifx_ssc_get_kernel_clk(struct ifx_ssc_port *info) +{ // ATTENTION: This function assumes that the CLC register is set with the + // appropriate value for RMC. + unsigned int rmc; + + rmc = (READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_CLC) & + IFX_CLC_RUN_DIVIDER_MASK) >> IFX_CLC_RUN_DIVIDER_OFFSET; + if (rmc == 0){ + printk("ifx_ssc_get_kernel_clk rmc==0 \n"); + return (0); + } + return (amazon_get_fpi_hz() / rmc); +} + +#ifndef not_yet +#ifdef IFX_SSC_INT_USE_BH +/* + * This routine is used by the interrupt handler to schedule + * processing in the software interrupt portion of the driver + * (also known as the "bottom half"). This can be called any + * number of times for any channel without harm. + */ +static inline void +ifx_ssc_sched_event(struct ifx_ssc_port *info, int event) +{ + info->event |= 1 << event; /* remember what kind of event and who */ + queue_task(&info->tqueue, &tq_cyclades); /* it belongs to */ + mark_bh(CYCLADES_BH); /* then trigger event */ +} /* ifx_ssc_sched_event */ + + +/* + * This routine is used to handle the "bottom half" processing for the + * serial driver, known also the "software interrupt" processing. + * This processing is done at the kernel interrupt level, after the + * cy#/_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This + * is where time-consuming activities which can not be done in the + * interrupt driver proper are done; the interrupt driver schedules + * them using ifx_ssc_sched_event(), and they get done here. + * + * This is done through one level of indirection--the task queue. + * When a hardware interrupt service routine wants service by the + * driver's bottom half, it enqueues the appropriate tq_struct (one + * per port) to the tq_cyclades work queue and sets a request flag + * via mark_bh for processing that queue. When the time is right, + * do_ifx_ssc_bh is called (because of the mark_bh) and it requests + * that the work queue be processed. + * + * Although this may seem unwieldy, it gives the system a way to + * pass an argument (in this case the pointer to the ifx_ssc_port + * structure) to the bottom half of the driver. Previous kernels + * had to poll every port to see if that port needed servicing. + */ +static void +do_ifx_ssc_bh(void) +{ + run_task_queue(&tq_cyclades); +} /* do_ifx_ssc_bh */ + +static void +do_softint(void *private_) +{ + struct ifx_ssc_port *info = (struct ifx_ssc_port *) private_; + + if (test_and_clear_bit(Cy_EVENT_HANGUP, &info->event)) { + wake_up_interruptible(&info->open_wait); + info->flags &= ~(ASYNC_NORMAL_ACTIVE| + ASYNC_CALLOUT_ACTIVE); + } + if (test_and_clear_bit(Cy_EVENT_OPEN_WAKEUP, &info->event)) { + wake_up_interruptible(&info->open_wait); + } + if (test_and_clear_bit(Cy_EVENT_DELTA_WAKEUP, &info->event)) { + wake_up_interruptible(&info->delta_msr_wait); + } + if (test_and_clear_bit(Cy_EVENT_WRITE_WAKEUP, &info->event)) { + wake_up_interruptible(&tty->write_wait); + } +#ifdef Z_WAKE + if (test_and_clear_bit(Cy_EVENT_SHUTDOWN_WAKEUP, &info->event)) { + wake_up_interruptible(&info->shutdown_wait); + } +#endif +} /* do_softint */ +#endif /* IFX_SSC_INT_USE_BH */ +#endif // not_yet + +inline static void +rx_int(struct ifx_ssc_port *info) +{ + int fifo_fill_lev, bytes_in_buf, i; + unsigned long tmp_val; + unsigned long *tmp_ptr; + unsigned int rx_valid_cnt; + /* number of words waiting in the RX FIFO */ + fifo_fill_lev = (READ_PERIPHERAL_REGISTER(info->mapbase + + IFX_SSC_FSTAT) & + IFX_SSC_FSTAT_RECEIVED_WORDS_MASK) >> + IFX_SSC_FSTAT_RECEIVED_WORDS_OFFSET; + // Note: There are always 32 bits in a fifo-entry except for the last + // word of a contigous transfer block and except for not in rx-only + // mode and CON.ENBV set. But for this case it should be a convention + // in software which helps: + // In tx or rx/tx mode all transfers from the buffer to the FIFO are + // 32-bit wide, except for the last three bytes, which could be a + // combination of 16- and 8-bit access. + // => The whole block is received as 32-bit words as a contigous stream, + // even if there was a gap in tx which has the fifo run out of data! + // Just the last fifo entry *may* be partially filled (0, 1, 2 or 3 bytes)! + + /* free space in the RX buffer */ + bytes_in_buf = info->rxbuf_end - info->rxbuf_ptr; + // transfer with 32 bits per entry + while ((bytes_in_buf >= 4) && (fifo_fill_lev > 0)) { + tmp_ptr = (unsigned long *)info->rxbuf_ptr; + *tmp_ptr = READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_RB); + info->rxbuf_ptr += 4; + info->stats.rxBytes += 4; + fifo_fill_lev --; + bytes_in_buf -= 4; + } // while ((bytes_in_buf >= 4) && (fifo_fill_lev > 0)) + // now do the rest as mentioned in STATE.RXBV + while ((bytes_in_buf > 0) && (fifo_fill_lev > 0)) { + rx_valid_cnt = (READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_STATE) & + IFX_SSC_STATE_RX_BYTE_VALID_MASK) >> + IFX_SSC_STATE_RX_BYTE_VALID_OFFSET; + if (rx_valid_cnt == 0) break; + if (rx_valid_cnt > bytes_in_buf) { + // ### TO DO: warning message: not block aligned data, other data + // in this entry will be lost + rx_valid_cnt = bytes_in_buf; + } + tmp_val = READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_RB); + + for (i=0; i<rx_valid_cnt; i++) { + *info->rxbuf_ptr = (tmp_val >> ( 8 * (rx_valid_cnt - i-1))) & 0xff; +/* + *info->rxbuf_ptr = tmp_val & 0xff; + tmp_val >>= 8; +*/ + bytes_in_buf--; + + + info->rxbuf_ptr++; + } + info->stats.rxBytes += rx_valid_cnt; + } // while ((bytes_in_buf > 0) && (fifo_fill_lev > 0)) + + // check if transfer is complete + if (info->rxbuf_ptr >= info->rxbuf_end) { + ifx_int_wrapper.disable(info->rxirq); + /* wakeup any processes waiting in read() */ + wake_up_interruptible(&info->rwait); + /* and in poll() */ + //wake_up_interruptible(&info->pwait); + } else if ((info->opts.modeRxTx == IFX_SSC_MODE_RX) && + (READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_RXCNT) == 0)) { + // if buffer not filled completely and rx request done initiate new transfer +/* + if (info->rxbuf_end - info->rxbuf_ptr < 65536) +*/ + if (info->rxbuf_end - info->rxbuf_ptr < IFX_SSC_RXREQ_BLOCK_SIZE) + WRITE_PERIPHERAL_REGISTER((info->rxbuf_end - info->rxbuf_ptr) << + IFX_SSC_RXREQ_RXCOUNT_OFFSET, + info->mapbase + IFX_SSC_RXREQ); + else + WRITE_PERIPHERAL_REGISTER(IFX_SSC_RXREQ_BLOCK_SIZE << IFX_SSC_RXREQ_RXCOUNT_OFFSET, + info->mapbase + IFX_SSC_RXREQ); + } +} // rx_int + +inline static void +tx_int(struct ifx_ssc_port *info) +{ + + int fifo_space, fill, i; + fifo_space = ((READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_ID) & + IFX_SSC_PERID_TXFS_MASK) >> IFX_SSC_PERID_TXFS_OFFSET) - + ((READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_FSTAT) & + IFX_SSC_FSTAT_TRANSMIT_WORDS_MASK) >> + IFX_SSC_FSTAT_TRANSMIT_WORDS_OFFSET); + + if (fifo_space == 0) + return; + + fill = info->txbuf_end - info->txbuf_ptr; + + if (fill > fifo_space * 4) + fill = fifo_space * 4; + + for (i = 0; i < fill / 4; i++) { + // at first 32 bit access + WRITE_PERIPHERAL_REGISTER(*(UINT32 *)info->txbuf_ptr, info->mapbase + IFX_SSC_TB); + info->txbuf_ptr += 4; + } + + fifo_space -= fill / 4; + info->stats.txBytes += fill & ~0x3; + fill &= 0x3; + if ((fifo_space > 0) & (fill > 1)) { + // trailing 16 bit access + WRITE_PERIPHERAL_REGISTER_16(*(UINT16 *)info->txbuf_ptr, info->mapbase + IFX_SSC_TB); + info->txbuf_ptr += 2; + info->stats.txBytes += 2; + fifo_space --; +/* added by bingtao */ + fill -=2; + } + if ((fifo_space > 0) & (fill > 0)) { + // trailing 8 bit access + WRITE_PERIPHERAL_REGISTER_8(*(UINT8 *)info->txbuf_ptr, info->mapbase + IFX_SSC_TB); + info->txbuf_ptr ++; + info->stats.txBytes ++; +/* + fifo_space --; +*/ + } + + // check if transmission complete + if (info->txbuf_ptr >= info->txbuf_end) { + ifx_int_wrapper.disable(info->txirq); + kfree(info->txbuf); + info->txbuf = NULL; + /* wake up any process waiting in poll() */ + //wake_up_interruptible(&info->pwait); + } + +} // tx_int + +static void +ifx_ssc_rx_int(int irq, void *dev_id, struct pt_regs *regs) +{ + struct ifx_ssc_port *info = (struct ifx_ssc_port *)dev_id; + //WRITE_PERIPHERAL_REGISTER(IFX_SSC_R_BIT, info->mapbase + IFX_SSC_IRN_CR); + rx_int(info); +} + +static void +ifx_ssc_tx_int(int irq, void *dev_id, struct pt_regs *regs) +{ + struct ifx_ssc_port *info = (struct ifx_ssc_port *)dev_id; + //WRITE_PERIPHERAL_REGISTER(IFX_SSC_T_BIT, info->mapbase + IFX_SSC_IRN_CR); + tx_int(info); +} + +static void +ifx_ssc_err_int(int irq, void *dev_id, struct pt_regs *regs) +{ + struct ifx_ssc_port *info = (struct ifx_ssc_port *)dev_id; + unsigned int state; + unsigned int write_back = 0; + unsigned long flags; + + + local_irq_save(flags); + state = READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_STATE); + + if ((state & IFX_SSC_STATE_RX_UFL) != 0) { + info->stats.rxUnErr++; + write_back |= IFX_SSC_WHBSTATE_CLR_RX_UFL_ERROR; + } + if ((state & IFX_SSC_STATE_RX_OFL) != 0) { + info->stats.rxOvErr++; + write_back |= IFX_SSC_WHBSTATE_CLR_RX_OFL_ERROR; + } + if ((state & IFX_SSC_STATE_TX_OFL) != 0) { + info->stats.txOvErr++; + write_back |= IFX_SSC_WHBSTATE_CLR_TX_OFL_ERROR; + } + if ((state & IFX_SSC_STATE_TX_UFL) != 0) { + info->stats.txUnErr++; + write_back |= IFX_SSC_WHBSTATE_CLR_TX_UFL_ERROR; + } +// if ((state & IFX_SSC_STATE_ABORT_ERR) != 0) { +// info->stats.abortErr++; +// write_back |= IFX_SSC_WHBSTATE_CLR_ABORT_ERROR; +// } + if ((state & IFX_SSC_STATE_MODE_ERR) != 0) { + info->stats.modeErr++; + write_back |= IFX_SSC_WHBSTATE_CLR_MODE_ERROR; + } + + if (write_back) + WRITE_PERIPHERAL_REGISTER(write_back, + info->mapbase + IFX_SSC_WHBSTATE); + + local_irq_restore(flags); +} + +#ifdef SSC_FRAME_INT_ENABLE +static void +ifx_ssc_frm_int(int irq, void *dev_id, struct pt_regs *regs) +{ + // ### TO DO: wake up framing wait-queue in conjunction with batch execution +} +#endif + +static void +ifx_ssc_abort(struct ifx_ssc_port *info) +{ + unsigned long flags; + bool enabled; + + local_irq_save(flags); + + // disable all int's + ifx_int_wrapper.disable(info->rxirq); + ifx_int_wrapper.disable(info->txirq); + ifx_int_wrapper.disable(info->errirq); +/* + ifx_int_wrapper.disable(info->frmirq); +*/ + local_irq_restore(flags); + + // disable SSC (also aborts a receive request!) + // ### TO DO: Perhaps it's better to abort after the receiption of a + // complete word. The disable cuts the transmission immediatly and + // releases the chip selects. This could result in unpredictable + // behavior of connected external devices! + enabled = (READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_STATE) + & IFX_SSC_STATE_IS_ENABLED) != 0; + WRITE_PERIPHERAL_REGISTER(IFX_SSC_WHBSTATE_CLR_ENABLE, + info->mapbase + IFX_SSC_WHBSTATE); + + + // flush fifos + WRITE_PERIPHERAL_REGISTER(IFX_SSC_XFCON_FIFO_FLUSH, + info->mapbase + IFX_SSC_TXFCON); + WRITE_PERIPHERAL_REGISTER(IFX_SSC_XFCON_FIFO_FLUSH, + info->mapbase + IFX_SSC_RXFCON); + + // free txbuf + if (info->txbuf != NULL) { + kfree(info->txbuf); + info->txbuf = NULL; + } + + // wakeup read process + if (info->rxbuf != NULL) + wake_up_interruptible(&info->rwait); + + // clear pending int's + ifx_int_wrapper.clear(info->rxirq); + ifx_int_wrapper.clear(info->txirq); + ifx_int_wrapper.clear(info->errirq); +/* + ifx_int_wrapper.clear(info->frmirq); +*/ + + // clear error flags + WRITE_PERIPHERAL_REGISTER(IFX_SSC_WHBSTATE_CLR_ALL_ERROR, + info->mapbase + IFX_SSC_WHBSTATE); + + //printk("IFX SSC%d: Transmission aborted\n", info->port_nr); + // enable SSC + if (enabled) + WRITE_PERIPHERAL_REGISTER(IFX_SSC_WHBSTATE_SET_ENABLE, + info->mapbase + IFX_SSC_WHBSTATE); + +} // ifx_ssc_abort + + +/* + * This routine is called whenever a port is opened. It enforces + * exclusive opening of a port and enables interrupts, etc. + */ +int +ifx_ssc_open(struct inode *inode, struct file * filp) +{ + struct ifx_ssc_port *info; + int line; + int from_kernel = 0; + + if ((inode == (struct inode *)0) || (inode == (struct inode *)1)) { + from_kernel = 1; + line = (int)inode; + } + else { + line = MINOR(filp->f_dentry->d_inode->i_rdev); + filp->f_op = &ifx_ssc_fops; + } + + /* don't open more minor devices than we can support */ + if (line < 0 || line >= PORT_CNT) + return -ENXIO; + + info = &isp[line]; + + /* exclusive open */ + if (info->port_is_open != 0) + return -EBUSY; + info->port_is_open++; + + ifx_int_wrapper.disable(info->rxirq); + ifx_int_wrapper.disable(info->txirq); + ifx_int_wrapper.disable(info->errirq); +/* + ifx_int_wrapper.disable(info->frmirq); +*/ + + /* Flush and enable TX/RX FIFO */ + WRITE_PERIPHERAL_REGISTER((IFX_SSC_DEF_TXFIFO_FL << + IFX_SSC_XFCON_ITL_OFFSET) | + IFX_SSC_XFCON_FIFO_FLUSH | + IFX_SSC_XFCON_FIFO_ENABLE, + info->mapbase + IFX_SSC_TXFCON); + WRITE_PERIPHERAL_REGISTER((IFX_SSC_DEF_RXFIFO_FL << + IFX_SSC_XFCON_ITL_OFFSET) | + IFX_SSC_XFCON_FIFO_FLUSH | + IFX_SSC_XFCON_FIFO_ENABLE, + info->mapbase + IFX_SSC_RXFCON); + + + /* logically flush the software FIFOs */ + info->rxbuf_ptr = 0; + info->txbuf_ptr = 0; + + /* clear all error bits */ + WRITE_PERIPHERAL_REGISTER(IFX_SSC_WHBSTATE_CLR_ALL_ERROR, + info->mapbase + IFX_SSC_WHBSTATE); + + // clear pending interrupts + ifx_int_wrapper.clear(info->rxirq); + ifx_int_wrapper.clear(info->txirq); + ifx_int_wrapper.clear(info->errirq); +/* + ifx_int_wrapper.clear(info->frmirq); +*/ + + // enable SSC + WRITE_PERIPHERAL_REGISTER(IFX_SSC_WHBSTATE_SET_ENABLE, + info->mapbase + IFX_SSC_WHBSTATE); + + MOD_INC_USE_COUNT; + + return 0; +} /* ifx_ssc_open */ +EXPORT_SYMBOL(ifx_ssc_open); + +/* + * This routine is called when a particular device is closed. + */ +int +ifx_ssc_close(struct inode *inode, struct file *filp) +{ + struct ifx_ssc_port *info; + int idx; + + if ((inode == (struct inode *)0) || (inode == (struct inode *)1)) + idx = (int)inode; + else + idx = MINOR(filp->f_dentry->d_inode->i_rdev); + + if (idx < 0 || idx >= PORT_CNT) + return -ENXIO; + + info = &isp[idx]; + if (!info) + return -ENXIO; + + // disable SSC + WRITE_PERIPHERAL_REGISTER(IFX_SSC_WHBSTATE_CLR_ENABLE, + info->mapbase + IFX_SSC_WHBSTATE); + + // call abort function to disable int's, flush fifos... + ifx_ssc_abort(info); + + info->port_is_open --; + MOD_DEC_USE_COUNT; + + return 0; +} /* ifx_ssc_close */ +EXPORT_SYMBOL(ifx_ssc_close); + +/* added by bingtao */ +/* helper routine to handle reads from the kernel or user-space */ +/* info->rxbuf : never kfree and contains valid data */ +/* should be points to NULL after copying data !!! */ +static ssize_t +ifx_ssc_read_helper_poll(struct ifx_ssc_port *info, char *buf, size_t len, + int from_kernel) +{ + ssize_t ret_val; + unsigned long flags; + + if (info->opts.modeRxTx == IFX_SSC_MODE_TX) + return -EFAULT; + local_irq_save(flags); + info->rxbuf_ptr = info->rxbuf; + info->rxbuf_end = info->rxbuf + len; + local_irq_restore(flags); +/* Vinetic driver always works in IFX_SSC_MODE_RXTX */ +/* TXRX in poll mode */ + while (info->rxbuf_ptr < info->rxbuf_end){ +/* This is the key point, if you don't check this condition + kfree (NULL) will happen + because tx only need write into FIFO, it's much fast than rx + So when rx still waiting , tx already finish and release buf +*/ + if (info->txbuf_ptr < info->txbuf_end) { + tx_int(info); + } + + rx_int(info); + }; + + ret_val = info->rxbuf_ptr - info->rxbuf; + return (ret_val); +} // ifx_ssc_read_helper_poll + +/* helper routine to handle reads from the kernel or user-space */ +/* info->rx_buf : never kfree and contains valid data */ +/* should be points to NULL after copying data !!! */ +static ssize_t +ifx_ssc_read_helper(struct ifx_ssc_port *info, char *buf, size_t len, + int from_kernel) +{ + ssize_t ret_val; + unsigned long flags; + DECLARE_WAITQUEUE(wait, current); + + if (info->opts.modeRxTx == IFX_SSC_MODE_TX) + return -EFAULT; + local_irq_save(flags); + info->rxbuf_ptr = info->rxbuf; + info->rxbuf_end = info->rxbuf + len; + if (info->opts.modeRxTx == IFX_SSC_MODE_RXTX) { + if ((info->txbuf == NULL) || + (info->txbuf != info->txbuf_ptr) || + (info->txbuf_end != len + info->txbuf)) { + local_irq_restore(flags); + printk("IFX SSC - %s: write must be called before calling " + "read in combined RX/TX!\n", __FUNCTION__); + return -EFAULT; + } + local_irq_restore(flags); + /* should enable tx, right?*/ + tx_int(info); + if (info->txbuf_ptr < info->txbuf_end){ + ifx_int_wrapper.enable(info->txirq); + } + + ifx_int_wrapper.enable(info->rxirq); + } else { // rx mode + local_irq_restore(flags); + if (READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_RXCNT) & + IFX_SSC_RXCNT_TODO_MASK) + return -EBUSY; + ifx_int_wrapper.enable(info->rxirq); + // rx request limited to ' bytes +/* + if (len < 65536) +*/ + if (len < IFX_SSC_RXREQ_BLOCK_SIZE) + WRITE_PERIPHERAL_REGISTER(len << IFX_SSC_RXREQ_RXCOUNT_OFFSET, + info->mapbase + IFX_SSC_RXREQ); + else + WRITE_PERIPHERAL_REGISTER(IFX_SSC_RXREQ_BLOCK_SIZE << IFX_SSC_RXREQ_RXCOUNT_OFFSET, + info->mapbase + IFX_SSC_RXREQ); + } + + __add_wait_queue(&info->rwait, &wait); + set_current_state(TASK_INTERRUPTIBLE); + // wakeup done in rx_int + + do { + local_irq_save(flags); + if (info->rxbuf_ptr >= info->rxbuf_end) + break; + local_irq_restore(flags); + +// if (filp->f_flags & O_NONBLOCK) +// { +// N = -EAGAIN; +// goto out; +// } + if (signal_pending(current)) { + ret_val = -ERESTARTSYS; + goto out; + } + schedule(); + } while (1); + + ret_val = info->rxbuf_ptr - info->rxbuf; // should be equal to len + local_irq_restore(flags); + + out: + current->state = TASK_RUNNING; + __remove_wait_queue(&info->rwait, &wait); + return (ret_val); +} // ifx_ssc_read_helper + + +#if 0 +/* helper routine to handle reads from the kernel or user-space */ +/* appropriate in interrupt context */ +static ssize_t +ifx_ssc_read_helper(struct ifx_ssc_port *info, char *buf, size_t len, + int from_kernel) +{ + ssize_t ret_val; + unsigned long flags; + DECLARE_WAITQUEUE(wait, current); + + if (info->opts.modeRxTx == IFX_SSC_MODE_TX) + return -EFAULT; + local_irq_save(flags); + info->rxbuf_ptr = info->rxbuf; + info->rxbuf_end = info->rxbuf + len; + if (info->opts.modeRxTx == IFX_SSC_MODE_RXTX) { + if ((info->txbuf == NULL) || + (info->txbuf != info->txbuf_ptr) || + (info->txbuf_end != len + info->txbuf)) { + local_irq_restore(flags); + printk("IFX SSC - %s: write must be called before calling " + "read in combined RX/TX!\n", __FUNCTION__); + return -EFAULT; + } + local_irq_restore(flags); + /* should enable tx, right?*/ + tx_int(info); + if (!in_irq()){ + if (info->txbuf_ptr < info->txbuf_end){ + ifx_int_wrapper.enable(info->txirq); + } + ifx_int_wrapper.enable(info->rxirq); + } + } else { // rx mode + local_irq_restore(flags); + if (READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_RXCNT) & + IFX_SSC_RXCNT_TODO_MASK) + return -EBUSY; + if (!in_irq()){ + ifx_int_wrapper.enable(info->rxirq); + } + + if (len < IFX_SSC_RXREQ_BLOCK_SIZE) + WRITE_PERIPHERAL_REGISTER(len << IFX_SSC_RXREQ_RXCOUNT_OFFSET, + info->mapbase + IFX_SSC_RXREQ); + else + WRITE_PERIPHERAL_REGISTER(IFX_SSC_RXREQ_BLOCK_SIZE << IFX_SSC_RXREQ_RXCOUNT_OFFSET, + info->mapbase + IFX_SSC_RXREQ); + } + if (in_irq()){ + do { + rx_int(info); + if (info->opts.modeRxTx == IFX_SSC_MODE_RXTX) { + tx_int(info); + } + + if (info->rxbuf_ptr >= info->rxbuf_end) + break; + } while (1); + ret_val = info->rxbuf_ptr - info->rxbuf; + }else{ + __add_wait_queue(&info->rwait, &wait); + set_current_state(TASK_INTERRUPTIBLE); + // wakeup done in rx_int + + do { + local_irq_save(flags); + if (info->rxbuf_ptr >= info->rxbuf_end) + break; + local_irq_restore(flags); + + if (signal_pending(current)) { + ret_val = -ERESTARTSYS; + goto out; + } + schedule(); + } while (1); + + ret_val = info->rxbuf_ptr - info->rxbuf; // should be equal to len + local_irq_restore(flags); + + out: + current->state = TASK_RUNNING; + __remove_wait_queue(&info->rwait, &wait); + } + return (ret_val); +} // ifx_ssc_read_helper +#endif + +/* helper routine to handle writes to the kernel or user-space */ +/* info->txbuf has two cases: + * 1) return value < 0 (-EFAULT), not touched at all + * 2) kfree and points to NULL in interrupt routine (but maybe later ) + */ +static ssize_t +ifx_ssc_write_helper(struct ifx_ssc_port *info, const char *buf, + size_t len, int from_kernel) +{ + // check if in tx or tx/rx mode + if (info->opts.modeRxTx == IFX_SSC_MODE_RX) + return -EFAULT; + + info->txbuf_ptr = info->txbuf; + info->txbuf_end = len + info->txbuf; + /* start the transmission (not in rx/tx, see read helper) */ + if (info->opts.modeRxTx == IFX_SSC_MODE_TX) { + tx_int(info); + if (info->txbuf_ptr < info->txbuf_end){ + ifx_int_wrapper.enable(info->txirq); + } + } + //local_irq_restore(flags); + return len; +} + +/* + * kernel interfaces for read and write. + * The caller must set port to: n for SSC<m> with n=m-1 (e.g. n=0 for SSC1) + */ +ssize_t +ifx_ssc_kread(int port, char *kbuf, size_t len) +{ + struct ifx_ssc_port *info; + ssize_t ret_val; + + if (port < 0 || port >= PORT_CNT) + return -ENXIO; + + if (len == 0) + return 0; + + info = &isp[port]; + + // check if reception in progress + if (info->rxbuf != NULL){ + printk("SSC device busy\n"); + return -EBUSY; + } + + info->rxbuf = kbuf; + if (info->rxbuf == NULL){ + printk("SSC device error\n"); + return -EINVAL; + } + +/* changed by bingtao */ + /* change by TaiCheng */ + //if (!in_irq()){ + if (0){ + ret_val = ifx_ssc_read_helper(info, kbuf, len, 1); + }else{ + ret_val = ifx_ssc_read_helper_poll(info, kbuf, len, 1); + }; + info->rxbuf = NULL; + + // ### TO DO: perhaps warn if ret_val != len + ifx_int_wrapper.disable(info->rxirq); + + return (ret_val); +} // ifx_ssc_kread +EXPORT_SYMBOL(ifx_ssc_kread); + +ssize_t +ifx_ssc_kwrite(int port, const char *kbuf, size_t len) +{ + struct ifx_ssc_port *info; + ssize_t ret_val; + + if (port < 0 || port >= PORT_CNT) + return -ENXIO; + + if (len == 0) + return 0; + + info = &isp[port]; + + // check if transmission in progress + if (info->txbuf != NULL) + return -EBUSY; + info->txbuf = (char *)kbuf; + + ret_val = ifx_ssc_write_helper(info, info->txbuf, len, 1); + if (ret_val < 0){ + info->txbuf = NULL; + } + return ret_val; +} +EXPORT_SYMBOL(ifx_ssc_kwrite); + + +/* + * user interfaces to read and write + */ +static ssize_t +ifx_ssc_read(struct file *filp, char *ubuf, size_t len, loff_t *off) +{ + ssize_t ret_val; + int idx; + struct ifx_ssc_port *info; + +/* + if (len == 0) + return (0); +*/ + idx = MINOR(filp->f_dentry->d_inode->i_rdev); + info = &isp[idx]; + + // check if reception in progress + if (info->rxbuf != NULL) + return -EBUSY; + + info->rxbuf = kmalloc(len+ 3, GFP_KERNEL); + if (info->rxbuf == NULL) + return -ENOMEM; + + ret_val = ifx_ssc_read_helper(info, info->rxbuf, len, 0); + // ### TO DO: perhaps warn if ret_val != len + if (copy_to_user((void*)ubuf, info->rxbuf, ret_val) != 0) + ret_val = -EFAULT; + + ifx_int_wrapper.disable(info->rxirq); + + kfree(info->rxbuf); + info->rxbuf = NULL; + return (ret_val); +} // ifx_ssc_read + +/* + * As many bytes as we have free space for are copied from the user + * into txbuf and the actual byte count is returned. The transmission is + * always kicked off by calling the appropriate TX routine. + */ +static ssize_t +ifx_ssc_write(struct file *filp, const char *ubuf, size_t len, loff_t *off) +{ + int idx; + struct ifx_ssc_port *info; + int ret_val; + + if (len == 0) + return (0); + + idx = MINOR(filp->f_dentry->d_inode->i_rdev); + info = &isp[idx]; + + // check if transmission in progress + if (info->txbuf != NULL) + return -EBUSY; + + info->txbuf = kmalloc(len+ 3, GFP_KERNEL); + if (info->txbuf == NULL) + return -ENOMEM; + + ret_val = copy_from_user(info->txbuf, ubuf, len); + if (ret_val == 0) + ret_val = ifx_ssc_write_helper(info, info->txbuf, len, 0); + else + ret_val = -EFAULT; + if (ret_val < 0) { + kfree(info->txbuf); // otherwise will be done in ISR + info->txbuf = NULL; + } + return (ret_val); +} /* ifx_ssc_write */ + + +/* + * ------------------------------------------------------------ + * ifx_ssc_ioctl() and friends + * ------------------------------------------------------------ + */ + +/*----------------------------------------------------------------------------- + FUNC-NAME : ifx_ssc_frm_status_get + LONG-NAME : framing status get + PURPOSE : Get the actual status of the framing. + + PARAMETER : *info pointer to the port-specific structure ifx_ssc_port. + + RESULT : pointer to a structure ifx_ssc_frm_status which holds busy and + count values. + + REMARKS : Returns a register value independent of framing is enabled or + not! Changes structure inside of info, so the return value isn't + needed at all, but could be used for simple access. +-----------------------------------------------------------------------------*/ +static struct ifx_ssc_frm_status * +ifx_ssc_frm_status_get(struct ifx_ssc_port *info) +{ + unsigned long tmp; + + tmp = READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_SFSTAT); + info->frm_status.DataBusy = (tmp & IFX_SSC_SFSTAT_IN_DATA) > 0; + info->frm_status.PauseBusy = (tmp & IFX_SSC_SFSTAT_IN_PAUSE) > 0; + info->frm_status.DataCount = (tmp & IFX_SSC_SFSTAT_DATA_COUNT_MASK) + >> IFX_SSC_SFSTAT_DATA_COUNT_OFFSET; + info->frm_status.PauseCount = (tmp & IFX_SSC_SFSTAT_PAUSE_COUNT_MASK) + >> IFX_SSC_SFSTAT_PAUSE_COUNT_OFFSET; + tmp = READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_SFCON); + info->frm_status.EnIntAfterData = + (tmp & IFX_SSC_SFCON_FIR_ENABLE_BEFORE_PAUSE) > 0; + info->frm_status.EnIntAfterPause = + (tmp & IFX_SSC_SFCON_FIR_ENABLE_AFTER_PAUSE) > 0; + return (&info->frm_status); +} // ifx_ssc_frm_status_get + + +/*----------------------------------------------------------------------------- + FUNC-NAME : ifx_ssc_frm_control_get + LONG-NAME : framing control get + PURPOSE : Get the actual control values of the framing. + + PARAMETER : *info pointer to the port-specific structure ifx_ssc_port. + + RESULT : pointer to a structure ifx_ssc_frm_opts which holds control bits + and count reload values. + + REMARKS : Changes structure inside of info, so the return value isn't + needed at all, but could be used for simple access. +-----------------------------------------------------------------------------*/ +static struct ifx_ssc_frm_opts * +ifx_ssc_frm_control_get(struct ifx_ssc_port *info) +{ + unsigned long tmp; + + tmp = READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_SFCON); + info->frm_opts.FrameEnable = (tmp & IFX_SSC_SFCON_SF_ENABLE) > 0; + info->frm_opts.DataLength = (tmp & IFX_SSC_SFCON_DATA_LENGTH_MASK) + >> IFX_SSC_SFCON_DATA_LENGTH_OFFSET; + info->frm_opts.PauseLength = (tmp & IFX_SSC_SFCON_PAUSE_LENGTH_MASK) + >> IFX_SSC_SFCON_PAUSE_LENGTH_OFFSET; + info->frm_opts.IdleData = (tmp & IFX_SSC_SFCON_PAUSE_DATA_MASK) + >> IFX_SSC_SFCON_PAUSE_DATA_OFFSET; + info->frm_opts.IdleClock = (tmp & IFX_SSC_SFCON_PAUSE_CLOCK_MASK) + >> IFX_SSC_SFCON_PAUSE_CLOCK_OFFSET; + info->frm_opts.StopAfterPause = + (tmp & IFX_SSC_SFCON_STOP_AFTER_PAUSE) > 0; + return (&info->frm_opts); +} // ifx_ssc_frm_control_get + + +/*----------------------------------------------------------------------------- + FUNC-NAME : ifx_ssc_frm_control_set + LONG-NAME : framing control set + PURPOSE : Set the actual control values of the framing. + + PARAMETER : *info pointer to the port-specific structure ifx_ssc_port. + + RESULT : pointer to a structure ifx_ssc_frm_opts which holds control bits + and count reload values. + + REMARKS : +-----------------------------------------------------------------------------*/ +static int +ifx_ssc_frm_control_set(struct ifx_ssc_port *info) +{ + unsigned long tmp; + + // check parameters + if ((info->frm_opts.DataLength > IFX_SSC_SFCON_DATA_LENGTH_MAX) || + (info->frm_opts.DataLength < 1) || + (info->frm_opts.PauseLength > IFX_SSC_SFCON_PAUSE_LENGTH_MAX) || + (info->frm_opts.PauseLength < 1) || + ((info->frm_opts.IdleData & ~(IFX_SSC_SFCON_PAUSE_DATA_MASK >> + IFX_SSC_SFCON_PAUSE_DATA_OFFSET)) != 0 ) || + ((info->frm_opts.IdleClock & ~(IFX_SSC_SFCON_PAUSE_CLOCK_MASK >> + IFX_SSC_SFCON_PAUSE_CLOCK_OFFSET)) != 0 )) + return -EINVAL; + + // read interrupt bits (they're not changed here) + tmp = READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_SFCON) & + (IFX_SSC_SFCON_FIR_ENABLE_BEFORE_PAUSE | + IFX_SSC_SFCON_FIR_ENABLE_AFTER_PAUSE); + + // set all values with respect to it's bit position (for data and pause + // length set N-1) + tmp = (info->frm_opts.DataLength - 1) << IFX_SSC_SFCON_DATA_LENGTH_OFFSET; + tmp |= (info->frm_opts.PauseLength - 1) << IFX_SSC_SFCON_PAUSE_LENGTH_OFFSET; + tmp |= info->frm_opts.IdleData << IFX_SSC_SFCON_PAUSE_DATA_OFFSET; + tmp |= info->frm_opts.IdleClock << IFX_SSC_SFCON_PAUSE_CLOCK_OFFSET; + tmp |= info->frm_opts.FrameEnable * IFX_SSC_SFCON_SF_ENABLE; + tmp |= info->frm_opts.StopAfterPause * IFX_SSC_SFCON_STOP_AFTER_PAUSE; + + WRITE_PERIPHERAL_REGISTER(tmp, info->mapbase + IFX_SSC_SFCON); + + return 0; +} // ifx_ssc_frm_control_set + + +/*----------------------------------------------------------------------------- + FUNC-NAME : ifx_ssc_rxtx_mode_set + LONG-NAME : rxtx mode set + PURPOSE : Set the transmission mode. + + PARAMETER : *info pointer to the port-specific structure ifx_ssc_port. + + RESULT : Returns error code + + REMARKS : Assumes that SSC not used (SSC disabled, device not opened yet + or just closed) +-----------------------------------------------------------------------------*/ +static int +ifx_ssc_rxtx_mode_set(struct ifx_ssc_port *info, unsigned int val) +{ + unsigned long tmp; + + // check parameters + if (!(info) || (val & ~(IFX_SSC_MODE_MASK))) + return -EINVAL; + /*check BUSY and RXCNT*/ + if ( READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_STATE) & IFX_SSC_STATE_BUSY + ||READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_RXCNT) & IFX_SSC_RXCNT_TODO_MASK) + return -EBUSY; + // modify + tmp = (READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_CON) & + ~(IFX_SSC_CON_RX_OFF | IFX_SSC_CON_TX_OFF)) | (val); + WRITE_PERIPHERAL_REGISTER(tmp, info->mapbase + IFX_SSC_CON); + info->opts.modeRxTx = val; +/* + printk(KERN_DEBUG "IFX SSC%d: Setting mode to %s%s\n", + info->port_nr, + ((val & IFX_SSC_CON_RX_OFF) == 0) ? "rx ":"", + ((val & IFX_SSC_CON_TX_OFF) == 0) ? "tx":""); +*/ + return 0; +} // ifx_ssc_rxtx_mode_set + +void ifx_gpio_init(void) +{ + u32 temp; +/* set gpio pin p0.10(SPI_DIN) p0.11(SPI_DOUT) p0.12(SPI_CLK) p0.13(SPI_CS2) direction */ + temp = *(AMAZON_GPIO_P0_DIR) ; + temp &= 0xFFFFFBFF; + temp |= 0x3800; + *(AMAZON_GPIO_P0_DIR) = temp; +/* set port 0 alternate select register 0 */ + temp = *(AMAZON_GPIO_P0_ALTSEL0) ; + temp &= 0xFFFFC3FF; + temp |= 0x00001c00; + *(AMAZON_GPIO_P0_ALTSEL0) = temp; + +/* set port 0 alternate select register 1 */ + temp = *(AMAZON_GPIO_P0_ALTSEL1) ; + temp &= 0xFFFFC3FF; + temp |= 0x00002000; + *(AMAZON_GPIO_P0_ALTSEL1) = temp; + +/* set port 0 open drain mode register */ + temp = *(AMAZON_GPIO_P0_OD); + temp |= 0x00003800; /* set output pin normal mode */ + *(AMAZON_GPIO_P0_OD)= temp; +} + +/* + * This routine intializes the SSC appropriately depending + * on slave/master and full-/half-duplex mode. + * It assumes that the SSC is disabled and the fifo's and buffers + * are flushes later on. + */ +static int +ifx_ssc_sethwopts(struct ifx_ssc_port *info) +{ + unsigned long flags, bits; + struct ifx_ssc_hwopts *opts = &info->opts; + + /* sanity checks */ + if ((opts->dataWidth < IFX_SSC_MIN_DATA_WIDTH) || + (opts->dataWidth > IFX_SSC_MAX_DATA_WIDTH)) { + printk("%s: sanity check failed\n", __FUNCTION__); + return -EINVAL; + } + bits = (opts->dataWidth - 1) << IFX_SSC_CON_DATA_WIDTH_OFFSET; + bits |= IFX_SSC_CON_ENABLE_BYTE_VALID; +// if (opts->abortErrDetect) +// bits |= IFX_SSC_CON_ABORT_ERR_CHECK; + if (opts->rxOvErrDetect) + bits |= IFX_SSC_CON_RX_OFL_CHECK; + if (opts->rxUndErrDetect) + bits |= IFX_SSC_CON_RX_UFL_CHECK; + if (opts->txOvErrDetect) + bits |= IFX_SSC_CON_TX_OFL_CHECK; + if (opts->txUndErrDetect) + bits |= IFX_SSC_CON_TX_UFL_CHECK; + if (opts->loopBack) + bits |= IFX_SSC_CON_LOOPBACK_MODE; + if (opts->echoMode) + bits |= IFX_SSC_CON_ECHO_MODE_ON; + if (opts->headingControl) + bits |= IFX_SSC_CON_MSB_FIRST; + if (opts->clockPhase) + bits |= IFX_SSC_CON_LATCH_THEN_SHIFT; + if (opts->clockPolarity) + bits |= IFX_SSC_CON_CLOCK_FALL; + switch (opts->modeRxTx) { + case IFX_SSC_MODE_TX: + bits |= IFX_SSC_CON_RX_OFF; + break; + case IFX_SSC_MODE_RX: + bits |= IFX_SSC_CON_TX_OFF; + break; + } // switch (opts->modeRxT) + local_irq_save(flags); + WRITE_PERIPHERAL_REGISTER(bits, info->mapbase + IFX_SSC_CON); + WRITE_PERIPHERAL_REGISTER((info->opts.gpoCs << IFX_SSC_GPOCON_ISCSB0_POS) | + (info->opts.gpoInv << IFX_SSC_GPOCON_INVOUT0_POS), + info->mapbase + IFX_SSC_GPOCON); + //master mode + if (opts->masterSelect){ + WRITE_PERIPHERAL_REGISTER(IFX_SSC_WHBSTATE_SET_MASTER_SELECT,info->mapbase + IFX_SSC_WHBSTATE); + }else{ + WRITE_PERIPHERAL_REGISTER(IFX_SSC_WHBSTATE_CLR_MASTER_SELECT,info->mapbase + IFX_SSC_WHBSTATE); + } + // init serial framing + WRITE_PERIPHERAL_REGISTER(0, info->mapbase + IFX_SSC_SFCON); + /* set up the port pins */ + //check for general requirements to switch (external) pad/pin characteristics + ifx_gpio_init(); + local_irq_restore(flags); + + return 0; +} // ifx_ssc_sethwopts + +static int +ifx_ssc_set_baud(struct ifx_ssc_port *info, unsigned int baud) +{ + unsigned int ifx_ssc_clock; + unsigned int br; + unsigned long flags; + bool enabled; + + ifx_ssc_clock = ifx_ssc_get_kernel_clk(info); + if (ifx_ssc_clock ==0) + return -EINVAL; + + local_irq_save(flags); + /* have to disable the SSC to set the baudrate */ + enabled = (READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_STATE) + & IFX_SSC_STATE_IS_ENABLED) != 0; + WRITE_PERIPHERAL_REGISTER(IFX_SSC_WHBSTATE_CLR_ENABLE, + info->mapbase + IFX_SSC_WHBSTATE); + + // compute divider + br = ((ifx_ssc_clock >> 1)/baud) - 1; + asm("SYNC"); + if (br > 0xffff || + ((br == 0) && + ((READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_STATE) & + IFX_SSC_STATE_IS_MASTER) == 0))){ + local_irq_restore(flags); + printk("%s: illegal baudrate %u\n", __FUNCTION__, baud); + return -EINVAL; + } + WRITE_PERIPHERAL_REGISTER(br, info->mapbase + IFX_SSC_BR); + if (enabled) + WRITE_PERIPHERAL_REGISTER(IFX_SSC_WHBSTATE_SET_ENABLE, + info->mapbase + IFX_SSC_WHBSTATE); + + local_irq_restore(flags); + return 0; +} // ifx_ssc_set_baud + +static int +ifx_ssc_hwinit(struct ifx_ssc_port *info) +{ + unsigned long flags; + bool enabled; + + /* have to disable the SSC */ + enabled = (READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_STATE) + & IFX_SSC_STATE_IS_ENABLED) != 0; + WRITE_PERIPHERAL_REGISTER(IFX_SSC_WHBSTATE_CLR_ENABLE, + info->mapbase + IFX_SSC_WHBSTATE); + + if (ifx_ssc_sethwopts(info) < 0) + { + printk("%s: setting the hardware options failed\n", + __FUNCTION__); + return -EINVAL; + } + + if (ifx_ssc_set_baud(info, info->baud) < 0) { + printk("%s: setting the baud rate failed\n", __FUNCTION__); + return -EINVAL; + } + local_irq_save(flags); + /* TX FIFO */ + WRITE_PERIPHERAL_REGISTER((IFX_SSC_DEF_TXFIFO_FL << + IFX_SSC_XFCON_ITL_OFFSET) | + IFX_SSC_XFCON_FIFO_ENABLE, + info->mapbase + IFX_SSC_TXFCON); + /* RX FIFO */ + WRITE_PERIPHERAL_REGISTER((IFX_SSC_DEF_RXFIFO_FL << + IFX_SSC_XFCON_ITL_OFFSET) | + IFX_SSC_XFCON_FIFO_ENABLE, + info->mapbase + IFX_SSC_RXFCON); + local_irq_restore(flags); + if (enabled) + WRITE_PERIPHERAL_REGISTER(IFX_SSC_WHBSTATE_SET_ENABLE, + info->mapbase + IFX_SSC_WHBSTATE); + return 0; +} // ifx_ssc_hwinit + +/*----------------------------------------------------------------------------- + FUNC-NAME : ifx_ssc_batch_exec + LONG-NAME : + PURPOSE : + + PARAMETER : *info pointer to the port-specific structure ifx_ssc_port. + + RESULT : Returns error code + + REMARKS : +-----------------------------------------------------------------------------*/ +static int +ifx_ssc_batch_exec(struct ifx_ssc_port *info, struct ifx_ssc_batch_list *batch_anchor) +{ + // ### TO DO: implement user space batch execution + // first, copy the whole linked list from user to kernel space + // save some hardware options + // execute list + // restore hardware options if selected + return -EFAULT; +} // ifx_ssc_batch_exec + + +/* + * This routine allows the driver to implement device- + * specific ioctl's. If the ioctl number passed in cmd is + * not recognized by the driver, it should return ENOIOCTLCMD. + */ +int +ifx_ssc_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, + unsigned long data) +{ + struct ifx_ssc_port *info; + int line, ret_val = 0; + unsigned long flags; + unsigned long tmp; + int from_kernel = 0; + + if ((inode == (struct inode *)0) || (inode == (struct inode *)1)) + { + from_kernel = 1; + line = (int)inode; + } + else + line = MINOR(filp->f_dentry->d_inode->i_rdev); + + /* don't use more minor devices than we can support */ + if (line < 0 || line >= PORT_CNT) + return -ENXIO; + + info = &isp[line]; + + switch (cmd) { + case IFX_SSC_STATS_READ: + /* data must be a pointer to a struct ifx_ssc_statistics */ + if (from_kernel) + memcpy((void *)data, (void *)&info->stats, + sizeof(struct ifx_ssc_statistics)); + else + if (copy_to_user((void *)data, + (void *)&info->stats, + sizeof(struct ifx_ssc_statistics))) + ret_val = -EFAULT; + break; + case IFX_SSC_STATS_RESET: + /* just resets the statistics counters */ + memset((void *)&info->stats, 0, sizeof(struct ifx_ssc_statistics)); + break; + case IFX_SSC_BAUD_SET: + /* if the buffers are not empty then the port is */ + /* busy and we shouldn't change things on-the-fly! */ + if (!info->txbuf || !info->rxbuf || + (READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_STATE) + & IFX_SSC_STATE_BUSY)) { + ret_val = -EBUSY; + break; + } + /* misuse flags */ + if (from_kernel) + flags = *((unsigned long *)data); + else + if (copy_from_user((void *)&flags, + (void *)data, sizeof(flags))) + { + ret_val = -EFAULT; + break; + } + if (flags == 0) + { + ret_val = -EINVAL; + break; + } + if (ifx_ssc_set_baud(info, flags) < 0) + { + ret_val = -EINVAL; + break; + } + info->baud = flags; + break; + case IFX_SSC_BAUD_GET: + if (from_kernel) + *((unsigned int *)data) = info->baud; + else + if (copy_to_user((void *)data, + (void *)&info->baud, + sizeof(unsigned long))) + ret_val = -EFAULT; + break; + case IFX_SSC_RXTX_MODE_SET: + if (from_kernel) + tmp = *((unsigned long *)data); + else + if (copy_from_user((void *)&tmp, + (void *)data, sizeof(tmp))) { + ret_val = -EFAULT; + break; + } + ret_val = ifx_ssc_rxtx_mode_set(info, tmp); + break; + case IFX_SSC_RXTX_MODE_GET: + tmp = READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_CON) & + (~(IFX_SSC_CON_RX_OFF | IFX_SSC_CON_TX_OFF)); + if (from_kernel) + *((unsigned int *)data) = tmp; + else + if (copy_to_user((void *)data, + (void *)&tmp, + sizeof(tmp))) + ret_val = -EFAULT; + break; + + case IFX_SSC_ABORT: + ifx_ssc_abort(info); + break; + + case IFX_SSC_GPO_OUT_SET: + if (from_kernel) + tmp = *((unsigned long *)data); + else + if (copy_from_user((void *)&tmp, + (void *)data, sizeof(tmp))) { + ret_val = -EFAULT; + break; + } + if (tmp > IFX_SSC_MAX_GPO_OUT) + ret_val = -EINVAL; + else + WRITE_PERIPHERAL_REGISTER + (1<<(tmp + IFX_SSC_WHBGPOSTAT_SETOUT0_POS), + info->mapbase + IFX_SSC_WHBGPOSTAT); + break; + case IFX_SSC_GPO_OUT_CLR: + if (from_kernel) + tmp = *((unsigned long *)data); + else + if (copy_from_user((void *)&tmp, + (void *)data, sizeof(tmp))) { + ret_val = -EFAULT; + break; + } + if (tmp > IFX_SSC_MAX_GPO_OUT) + ret_val = -EINVAL; + else { + WRITE_PERIPHERAL_REGISTER + (1<<(tmp + IFX_SSC_WHBGPOSTAT_CLROUT0_POS), + info->mapbase + IFX_SSC_WHBGPOSTAT); + } + break; + case IFX_SSC_GPO_OUT_GET: + tmp = READ_PERIPHERAL_REGISTER + (info->mapbase + IFX_SSC_GPOSTAT); + if (from_kernel) + *((unsigned int *)data) = tmp; + else + if (copy_to_user((void *)data, + (void *)&tmp, + sizeof(tmp))) + ret_val = -EFAULT; + break; + case IFX_SSC_FRM_STATUS_GET: + ifx_ssc_frm_status_get(info); + if (from_kernel) + memcpy((void *)data, (void *)&info->frm_status, + sizeof(struct ifx_ssc_frm_status)); + else + if (copy_to_user((void *)data, + (void *)&info->frm_status, + sizeof(struct ifx_ssc_frm_status))) + ret_val = -EFAULT; + break; + case IFX_SSC_FRM_CONTROL_GET: + ifx_ssc_frm_control_get(info); + if (from_kernel) + memcpy((void *)data, (void *)&info->frm_opts, + sizeof(struct ifx_ssc_frm_opts)); + else + if (copy_to_user((void *)data, + (void *)&info->frm_opts, + sizeof(struct ifx_ssc_frm_opts))) + ret_val = -EFAULT; + break; + case IFX_SSC_FRM_CONTROL_SET: + if (from_kernel) + memcpy((void *)&info->frm_opts, (void *)data, + sizeof(struct ifx_ssc_frm_opts)); + else + if (copy_to_user((void *)&info->frm_opts, + (void *)data, + sizeof(struct ifx_ssc_frm_opts))){ + ret_val = -EFAULT; + break; + } + ret_val = ifx_ssc_frm_control_set(info); + break; + case IFX_SSC_HWOPTS_SET: + /* data must be a pointer to a struct ifx_ssc_hwopts */ + /* if the buffers are not empty then the port is */ + /* busy and we shouldn't change things on-the-fly! */ + if (!info->txbuf || !info->rxbuf || + (READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_STATE) + & IFX_SSC_STATE_BUSY)) { + ret_val = -EBUSY; + break; + } + if (from_kernel) + memcpy((void *)&info->opts, (void *)data, + sizeof(struct ifx_ssc_hwopts)); + else + if (copy_from_user((void *)&info->opts, + (void *)data, + sizeof(struct ifx_ssc_hwopts))) + { + ret_val = -EFAULT; + break; + } + if (ifx_ssc_hwinit(info) < 0) + { + ret_val = -EIO; + } + break; + case IFX_SSC_HWOPTS_GET: + /* data must be a pointer to a struct ifx_ssc_hwopts */ + if (from_kernel) + memcpy((void *)data, (void *)&info->opts, + sizeof(struct ifx_ssc_hwopts)); + else + if (copy_to_user((void *)data, + (void *)&info->opts, + sizeof(struct ifx_ssc_hwopts))) + ret_val = -EFAULT; + break; + default: + ret_val = -ENOIOCTLCMD; + } + + return ret_val; +} /* ifx_ssc_ioctl */ +EXPORT_SYMBOL(ifx_ssc_ioctl); + +///* the poll routine */ +//static unsigned int +//ifx_ssc_poll(struct file *filp, struct poll_table_struct *pts) +//{ +// int unit = MINOR(filp->f_dentry->d_inode->i_rdev); +// struct ifx_ssc_port *info; +// unsigned int mask = 0; +// int spc; +// +// info = &isp[unit]; +// +// /* add event to the wait queues */ +// /* DO NOT FORGET TO DO A WAKEUP ON THESE !!!! */ +// poll_wait(filp, &info->pwait, pts); +// +// /* are there bytes in the RX SW-FIFO? */ +// if (info->rxrp != info->rxwp) +// mask |= POLLIN | POLLRDNORM; +// +// /* free space in the TX SW-FIFO */ +// spc = info->txrp - info->txwp - 1; +// if (spc < 0) +// spc += TX_BUFSIZE; +//#ifdef IFX_SSC_USEDMA +// /* writing always works, except in the DMA case when all descriptors */ +// /* are used up */ +// if (unit == 1 && info->dma_freecnt == 0) +// spc = 0; +//#endif +// if (spc > 0) +// mask |= POLLOUT | POLLWRNORM; +// +// return (mask); +//} + +static int +ifx_ssc1_read_proc(char *page, char **start, off_t offset, int count, int *eof, void *data) +{ + int off = 0; + unsigned long flags; + + /* don't want any interrupts here */ + save_flags(flags); + cli(); + + + /* print statistics */ + off += sprintf(page+off, "Statistics for Infineon Synchronous Serial Controller SSC1\n"); + off += sprintf(page+off, "RX overflow errors %d\n", isp[0].stats.rxOvErr); + off += sprintf(page+off, "RX underflow errors %d\n", isp[0].stats.rxUnErr); + off += sprintf(page+off, "TX overflow errors %d\n", isp[0].stats.txOvErr); + off += sprintf(page+off, "TX underflow errors %d\n", isp[0].stats.txUnErr); + off += sprintf(page+off, "Abort errors %d\n", isp[0].stats.abortErr); + off += sprintf(page+off, "Mode errors %d\n", isp[0].stats.modeErr); + off += sprintf(page+off, "RX Bytes %d\n", isp[0].stats.rxBytes); + off += sprintf(page+off, "TX Bytes %d\n", isp[0].stats.txBytes); + + restore_flags (flags); /* XXXXX */ + *eof = 1; + return (off); +} + + +/* + * This routine prints out the appropriate serial driver version number + */ +static inline void +show_version(void) +{ +#if 0 + printk("Infineon Technologies Synchronous Serial Controller (SSC) driver\n" + " version %s - built %s %s\n", IFX_SSC_DRV_VERSION, __DATE__, __TIME__); +#endif +} /* show_version */ + + +/* + * Due to the fact that a port can be dynamically switched between slave + * and master mode using an IOCTL the hardware is not initialized here, + * but in ifx_ssc_hwinit() as a result of an IOCTL. + */ +int __init +ifx_ssc_init(void) +{ + struct ifx_ssc_port *info; + int i, nbytes; + unsigned long flags; + int ret_val; + + // ### TO DO: dynamic port count evaluation due to pin multiplexing + + ret_val = -ENOMEM; + nbytes = PORT_CNT * sizeof(struct ifx_ssc_port); + isp = (struct ifx_ssc_port *)kmalloc(nbytes, GFP_KERNEL); + if (isp == NULL) + { + printk("%s: no memory for isp\n", __FUNCTION__); + return (ret_val); + } + memset(isp, 0, nbytes); + + show_version(); + + /* register the device */ + ret_val = -ENXIO; +/* + i = maj; +*/ + if ((i = register_chrdev(maj, "ssc", &ifx_ssc_fops)) < 0) + { + printk("Unable to register major %d for the Infineon SSC\n", maj); + if (maj == 0){ + goto errout; + } + else{ + maj = 0; + if ((i = register_chrdev(maj, "ssc", &ifx_ssc_fops)) < 0) + { + printk("Unable to register major %d for the Infineon SSC\n", maj); + goto errout; + } + } + } + if (maj == 0) maj = i; + //printk("registered major %d for Infineon SSC\n", maj); + + /* set default values in ifx_ssc_port */ + for (i = 0; i < PORT_CNT; i++) { + info = &isp[i]; + info->port_nr = i; + /* default values for the HwOpts */ + info->opts.AbortErrDetect = IFX_SSC_DEF_ABRT_ERR_DETECT; + info->opts.rxOvErrDetect = IFX_SSC_DEF_RO_ERR_DETECT; + info->opts.rxUndErrDetect = IFX_SSC_DEF_RU_ERR_DETECT; + info->opts.txOvErrDetect = IFX_SSC_DEF_TO_ERR_DETECT; + info->opts.txUndErrDetect = IFX_SSC_DEF_TU_ERR_DETECT; + info->opts.loopBack = IFX_SSC_DEF_LOOP_BACK; + info->opts.echoMode = IFX_SSC_DEF_ECHO_MODE; + info->opts.idleValue = IFX_SSC_DEF_IDLE_DATA; + info->opts.clockPolarity = IFX_SSC_DEF_CLOCK_POLARITY; + info->opts.clockPhase = IFX_SSC_DEF_CLOCK_PHASE; + info->opts.headingControl = IFX_SSC_DEF_HEADING_CONTROL; + info->opts.dataWidth = IFX_SSC_DEF_DATA_WIDTH; + info->opts.modeRxTx = IFX_SSC_DEF_MODE_RXTX; + info->opts.gpoCs = IFX_SSC_DEF_GPO_CS; + info->opts.gpoInv = IFX_SSC_DEF_GPO_INV; + info->opts.masterSelect = IFX_SSC_DEF_MASTERSLAVE; + info->baud = IFX_SSC_DEF_BAUDRATE; + info->rxbuf = NULL; + info->txbuf = NULL; + /* values specific to SSC1 */ + if (i == 0) { + info->mapbase = AMAZON_SSC_BASE_ADD_0; + // ### TO DO: power management + + // setting interrupt vectors + info->txirq = IFX_SSC_TIR; + info->rxirq = IFX_SSC_RIR; + info->errirq = IFX_SSC_EIR; +/* + info->frmirq = IFX_SSC_FIR; +*/ + } + /* activate SSC */ + /* CLC.DISS = 0 */ + WRITE_PERIPHERAL_REGISTER(IFX_SSC_DEF_RMC << IFX_CLC_RUN_DIVIDER_OFFSET, info->mapbase + IFX_SSC_CLC); + +// ### TO DO: multiple instances + + init_waitqueue_head(&info->rwait); + //init_waitqueue_head(&info->pwait); + + local_irq_save(flags); + + // init serial framing register + WRITE_PERIPHERAL_REGISTER(IFX_SSC_DEF_SFCON, info->mapbase + IFX_SSC_SFCON); + + /* try to get the interrupts */ + // ### TO DO: interrupt handling with multiple instances + ret_val = ifx_int_wrapper.request(info->txirq, ifx_ssc_tx_int, + 0, "ifx_ssc_tx", info); + if (ret_val){ + printk("%s: unable to get irq %d\n", __FUNCTION__, + info->txirq); + local_irq_restore(flags); + goto errout; + } + ret_val = ifx_int_wrapper.request(info->rxirq, ifx_ssc_rx_int, + 0, "ifx_ssc_rx", info); + if (ret_val){ + printk("%s: unable to get irq %d\n", __FUNCTION__, + info->rxirq); + local_irq_restore(flags); + goto irqerr; + } + ret_val = ifx_int_wrapper.request(info->errirq, ifx_ssc_err_int, + 0, "ifx_ssc_err", info); + if (ret_val){ + printk("%s: unable to get irq %d\n", __FUNCTION__, + info->errirq); + local_irq_restore(flags); + goto irqerr; + } +/* + ret_val = ifx_int_wrapper.request(info->frmirq, ifx_ssc_frm_int, + 0, "ifx_ssc_frm", info); + if (ret_val){ + printk("%s: unable to get irq %d\n", __FUNCTION__, + info->frmirq); + local_irq_restore(flags); + goto irqerr; + } + +*/ + WRITE_PERIPHERAL_REGISTER(IFX_SSC_DEF_IRNEN, info->mapbase + IFX_SSC_IRN_EN); + + local_irq_restore(flags); + } // for (i = 0; i < PORT_CNT; i++) + + /* init the SSCs with default values */ + for (i = 0; i < PORT_CNT; i++) + { + info = &isp[i]; + if (ifx_ssc_hwinit(info) < 0) + { + printk("%s: hardware init failed for port %d\n", + __FUNCTION__, i); + goto irqerr; + } + } + + /* register /proc read handler */ + // ### TO DO: multiple instances + /* for SSC1, which is always present */ + create_proc_read_entry("driver/ssc1", 0, NULL, ifx_ssc1_read_proc, NULL); + return 0; + +irqerr: + // ### TO DO: multiple instances + ifx_int_wrapper.free(isp[0].txirq,&isp[0]); + ifx_int_wrapper.free(isp[0].rxirq,&isp[0]); + ifx_int_wrapper.free(isp[0].errirq,&isp[0]); +/* + ifx_int_wrapper.free(isp[0].frmirq, &isp[0]); +*/ +errout: + /* free up any allocated memory in the error case */ + kfree(isp); + return (ret_val); +} /* ifx_ssc_init */ + + +void +ifx_ssc_cleanup_module(void) +{ + int i; + + /* free up any allocated memory */ + for (i = 0; i < PORT_CNT; i++) + { + /* disable the SSC */ + WRITE_PERIPHERAL_REGISTER(IFX_SSC_WHBSTATE_CLR_ENABLE,isp[i].mapbase + IFX_SSC_WHBSTATE); + /* free the interrupts */ + ifx_int_wrapper.free(isp[i].txirq, &isp[i]); + ifx_int_wrapper.free(isp[i].rxirq, &isp[i]); + ifx_int_wrapper.free(isp[i].errirq, &isp[i]); +/* + ifx_int_wrapper.free(isp[i].frmirq, &isp[i]); + + if (isp[i].rxbuf != NULL) + kfree(isp[i].rxbuf); + if (isp[i].txbuf != NULL) + kfree(isp[i].txbuf); +*/ + } + kfree(isp); + /* unregister the device */ + if (unregister_chrdev(maj, "ssc")) + { + printk("Unable to unregister major %d for the SSC\n", maj); + } + /* delete /proc read handler */ + remove_proc_entry("driver/ssc1", NULL); + remove_proc_entry("driver/ssc2", NULL); +} /* ifx_ssc_cleanup_module */ + +module_exit(ifx_ssc_cleanup_module); + +/* Module entry-points */ +module_init(ifx_ssc_init); + +#ifndef MODULE +static int __init +ifx_ssc_set_maj(char *str) +{ + maj = simple_strtol(str, NULL, 0); + return 1; +} +__setup("ssc_maj=", ifx_ssc_set_maj); +#endif /* !MODULE */ + +#define AMAZON_SSC_EMSG(fmt,arg...) printk("%s: "fmt,__FUNCTION__, ##arg) +/* Brief: chip select enable + */ +inline int amazon_ssc_cs_low(u32 pin) +{ + int ret=0; + if ((ret=ifx_ssc_ioctl((struct inode *)0, NULL,IFX_SSC_GPO_OUT_CLR, (unsigned long)&pin))){ + AMAZON_SSC_EMSG("clear CS %d fails\n",pin); + } + wmb(); + return ret; +} +EXPORT_SYMBOL(amazon_ssc_cs_low); +/* Brief: chip select disable + */ +inline int amazon_ssc_cs_high(u32 pin) +{ + int ret=0; + if ((ret=ifx_ssc_ioctl((struct inode *)0, NULL,IFX_SSC_GPO_OUT_SET, (unsigned long)&pin))){ + AMAZON_SSC_EMSG("set CS %d fails\n", pin); + } + wmb(); + return ret; +} +EXPORT_SYMBOL(amazon_ssc_cs_high); +/* Brief: one SSC session + * Parameter: + * tx_buf + * tx_len + * rx_buf + * rx_len + * session_mode: IFX_SSC_MODE_RXTX or IFX_SSC_MODE_TX + * Return: >=0 number of bytes received (if rx_buf != 0) or transmitted + * <0 error code + * Description: + * 0. copy data to internal buffer + * 1. Write command + * 2a. If SSC_SESSION_MODE_TXONLY, read tx_len data + * 2b. If not Read back (tx_len + rx_len) data + * 3. copy internal buffer to rx buf if necessary + */ +static int ssc_session(char * tx_buf, u32 tx_len, char * rx_buf, u32 rx_len) +{ + int ret=0; + + char * ssc_tx_buf=NULL; + char * ssc_rx_buf=NULL; + +// volatile char ssc_tx_buf[128]={0}; +// volatile char ssc_rx_buf[128]={0}; + + int eff_size=0; + u8 mode=0; + + if (tx_buf == NULL && tx_len ==0 && rx_buf == NULL && rx_len == 0){ + AMAZON_SSC_EMSG("invalid parameters\n"); + ret=-EINVAL; + goto ssc_session_exit; + }else if (tx_buf == NULL || tx_len == 0){ + if (rx_buf != NULL && rx_len != 0){ + mode = IFX_SSC_MODE_RX; + }else{ + AMAZON_SSC_EMSG("invalid parameters\n"); + ret=-EINVAL; + goto ssc_session_exit; + } + }else if (rx_buf == NULL || rx_len ==0){ + if (tx_buf != NULL && tx_len != 0){ + mode = IFX_SSC_MODE_TX; + }else{ + AMAZON_SSC_EMSG("invalid parameters\n"); + ret=-EINVAL; + goto ssc_session_exit; + } + }else{ + mode = IFX_SSC_MODE_RXTX; + } + + if (mode == IFX_SSC_MODE_RXTX){ + eff_size = tx_len + rx_len; + }else if (mode == IFX_SSC_MODE_RX){ + eff_size = rx_len; + }else{ + eff_size = tx_len; + } + + //4 bytes alignment, required by driver + /* change by TaiCheng */ + //if (in_irq()){ + if (1){ + ssc_tx_buf = (char*) kmalloc(sizeof(char) * ((eff_size + 3) & (~3)), GFP_ATOMIC); + ssc_rx_buf = (char*) kmalloc(sizeof(char) * ((eff_size + 3) & (~3)), GFP_ATOMIC); + }else{ + ssc_tx_buf = (char*) kmalloc(sizeof(char) * ((eff_size + 3) & (~3)), GFP_KERNEL); + ssc_rx_buf = (char*) kmalloc(sizeof(char) * ((eff_size + 3) & (~3)), GFP_KERNEL); + } + if (ssc_tx_buf == NULL || ssc_rx_buf == NULL){ + AMAZON_SSC_EMSG("no memory for size of %d\n", eff_size); + ret = -ENOMEM; + goto ssc_session_exit; + } + memset((void*)ssc_tx_buf, 0, eff_size); + memset((void*)ssc_rx_buf, 0, eff_size); + + if (tx_len>0){ + memcpy(ssc_tx_buf, tx_buf, tx_len); + } + + ret=ifx_ssc_kwrite(0, ssc_tx_buf, eff_size); + + if (ret > 0) { + ssc_tx_buf = NULL; //should be freed by ifx_ssc_kwrite + } + + if ( ret != eff_size ){ + AMAZON_SSC_EMSG("ifx_ssc_write return %d\n",ret); + goto ssc_session_exit; + } + ret=ifx_ssc_kread(0, ssc_rx_buf,eff_size); + if ( ret != eff_size ){ + AMAZON_SSC_EMSG("ifx_ssc_read return %d\n",ret); + goto ssc_session_exit; + } + + memcpy(rx_buf, ssc_rx_buf+tx_len, rx_len); + + if (mode == IFX_SSC_MODE_TX) { + ret = tx_len; + }else{ + ret = rx_len; + } +ssc_session_exit: + + if (ssc_tx_buf != NULL) kfree(ssc_tx_buf); + if (ssc_rx_buf != NULL) kfree(ssc_rx_buf); + + if (ret<0) { + printk("ssc session fails\n"); + } + return ret; +} +/* Brief: TX-RX session + * Parameter: + * tx_buf + * tx_len + * rx_buf + * rx_len + * Return: >=0 number of bytes received + * <0 error code + * Description: + * 1. TX session + * 2. RX session + */ +int amazon_ssc_txrx(char * tx_buf, u32 tx_len, char * rx_buf, u32 rx_len) +{ + return ssc_session(tx_buf,tx_len,rx_buf,rx_len); +} +EXPORT_SYMBOL(amazon_ssc_txrx); +/* Brief: TX only session + * Parameter: + * tx_buf + * tx_len + * Return: >=0 number of bytes transmitted + * <0 error code + */ +int amazon_ssc_tx(char * tx_buf, u32 tx_len) +{ + return ssc_session(tx_buf,tx_len,NULL,0); +} +EXPORT_SYMBOL(amazon_ssc_tx); +/* Brief: RX only session + * Parameter: + * rx_buf + * rx_len + * Return: >=0 number of bytes received + * <0 error code + */ +int amazon_ssc_rx(char * rx_buf, u32 rx_len) +{ + return ssc_session(NULL,0,rx_buf,rx_len); +} +EXPORT_SYMBOL(amazon_ssc_rx); + |