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, 0 insertions, 2121 deletions
diff --git a/target/linux/amazon/files/drivers/char/ifx_ssc.c b/target/linux/amazon/files/drivers/char/ifx_ssc.c deleted file mode 100644 index ea01659a94..0000000000 --- a/target/linux/amazon/files/drivers/char/ifx_ssc.c +++ /dev/null @@ -1,2121 +0,0 @@ -/************************************************** - * - * 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); - |