initial merge of infineon code for amazon, pci is still broken a bit. a big thank you goes to infineon for providing info and reference code

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@8137 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 2121 insertions, 0 deletions

diff --git a/target/linux/amazon-2.6/files/drivers/char/ifx_ssc.c b/target/linux/amazon-2.6/files/drivers/char/ifx_ssc.c
new file mode 100644
index 0000000000..ea01659a94
--- /dev/null
+++ b/target/linux/amazon-2.6/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);
+