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-rw-r--r--target/linux/amazon/files/drivers/char/ifx_ssc.c2121
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);
+