Merge /scratch/Ksrc/linux-git/

1 files changed, 1283 insertions, 0 deletions

diff --git a/arch/cris/arch-v32/drivers/sync_serial.c b/arch/cris/arch-v32/drivers/sync_serial.c
new file mode 100644
index 00000000000..c85a6df8558
--- /dev/null
+++ b/arch/cris/arch-v32/drivers/sync_serial.c
@@ -0,0 +1,1283 @@
+/*
+ * Simple synchronous serial port driver for ETRAX FS.
+ *
+ * Copyright (c) 2005 Axis Communications AB
+ *
+ * Author: Mikael Starvik
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/major.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/spinlock.h>
+
+#include <asm/io.h>
+#include <asm/arch/dma.h>
+#include <asm/arch/pinmux.h>
+#include <asm/arch/hwregs/reg_rdwr.h>
+#include <asm/arch/hwregs/sser_defs.h>
+#include <asm/arch/hwregs/dma_defs.h>
+#include <asm/arch/hwregs/dma.h>
+#include <asm/arch/hwregs/intr_vect_defs.h>
+#include <asm/arch/hwregs/intr_vect.h>
+#include <asm/arch/hwregs/reg_map.h>
+#include <asm/sync_serial.h>
+
+/* The receiver is a bit tricky beacuse of the continuous stream of data.*/
+/*                                                                       */
+/* Three DMA descriptors are linked together. Each DMA descriptor is     */
+/* responsible for port->bufchunk of a common buffer.                    */
+/*                                                                       */
+/* +---------------------------------------------+                       */
+/* |   +----------+   +----------+   +----------+ |                      */
+/* +-> | Descr[0] |-->| Descr[1] |-->| Descr[2] |-+                      */
+/*     +----------+   +----------+   +----------+                        */
+/*         |            |              |                                 */
+/*         v            v              v                                 */
+/*   +-------------------------------------+                             */
+/*   |        BUFFER                       |                             */
+/*   +-------------------------------------+                             */
+/*      |<- data_avail ->|                                               */
+/*    readp          writep                                              */
+/*                                                                       */
+/* If the application keeps up the pace readp will be right after writep.*/
+/* If the application can't keep the pace we have to throw away data.    */
+/* The idea is that readp should be ready with the data pointed out by	 */
+/* Descr[i] when the DMA has filled in Descr[i+1].                       */
+/* Otherwise we will discard	                                         */
+/* the rest of the data pointed out by Descr1 and set readp to the start */
+/* of Descr2                                                             */
+
+#define SYNC_SERIAL_MAJOR 125
+
+/* IN_BUFFER_SIZE should be a multiple of 6 to make sure that 24 bit */
+/* words can be handled */
+#define IN_BUFFER_SIZE 12288
+#define IN_DESCR_SIZE 256
+#define NUM_IN_DESCR (IN_BUFFER_SIZE/IN_DESCR_SIZE)
+#define OUT_BUFFER_SIZE 4096
+
+#define DEFAULT_FRAME_RATE 0
+#define DEFAULT_WORD_RATE 7
+
+/* NOTE: Enabling some debug will likely cause overrun or underrun,
+ * especially if manual mode is use.
+ */
+#define DEBUG(x)
+#define DEBUGREAD(x)
+#define DEBUGWRITE(x)
+#define DEBUGPOLL(x)
+#define DEBUGRXINT(x)
+#define DEBUGTXINT(x)
+
+typedef struct sync_port
+{
+	reg_scope_instances regi_sser;
+	reg_scope_instances regi_dmain;
+	reg_scope_instances regi_dmaout;
+
+	char started; /* 1 if port has been started */
+	char port_nbr; /* Port 0 or 1 */
+	char busy; /* 1 if port is busy */
+
+	char enabled;  /* 1 if port is enabled */
+	char use_dma;  /* 1 if port uses dma */
+	char tr_running;
+
+	char init_irqs;
+	int output;
+	int input;
+
+	volatile unsigned int out_count; /* Remaining bytes for current transfer */
+	unsigned char* outp; /* Current position in out_buffer */
+	volatile unsigned char* volatile readp;  /* Next byte to be read by application */
+	volatile unsigned char* volatile writep; /* Next byte to be written by etrax */
+	unsigned int in_buffer_size;
+	unsigned int inbufchunk;
+	unsigned char out_buffer[OUT_BUFFER_SIZE] __attribute__ ((aligned(32)));
+	unsigned char in_buffer[IN_BUFFER_SIZE]__attribute__ ((aligned(32)));
+	unsigned char flip[IN_BUFFER_SIZE] __attribute__ ((aligned(32)));
+	struct dma_descr_data* next_rx_desc;
+	struct dma_descr_data* prev_rx_desc;
+	int full;
+
+	dma_descr_data in_descr[NUM_IN_DESCR] __attribute__ ((__aligned__(16)));
+	dma_descr_context in_context __attribute__ ((__aligned__(32)));
+	dma_descr_data out_descr __attribute__ ((__aligned__(16)));
+	dma_descr_context out_context __attribute__ ((__aligned__(32)));
+	wait_queue_head_t out_wait_q;
+	wait_queue_head_t in_wait_q;
+
+	spinlock_t lock;
+} sync_port;
+
+static int etrax_sync_serial_init(void);
+static void initialize_port(int portnbr);
+static inline int sync_data_avail(struct sync_port *port);
+
+static int sync_serial_open(struct inode *, struct file*);
+static int sync_serial_release(struct inode*, struct file*);
+static unsigned int sync_serial_poll(struct file *filp, poll_table *wait);
+
+static int sync_serial_ioctl(struct inode*, struct file*,
+			     unsigned int cmd, unsigned long arg);
+static ssize_t sync_serial_write(struct file * file, const char * buf,
+				 size_t count, loff_t *ppos);
+static ssize_t sync_serial_read(struct file *file, char *buf,
+				size_t count, loff_t *ppos);
+
+#if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
+     defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
+    (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
+     defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))
+#define SYNC_SER_DMA
+#endif
+
+static void send_word(sync_port* port);
+static void start_dma(struct sync_port *port, const char* data, int count);
+static void start_dma_in(sync_port* port);
+#ifdef SYNC_SER_DMA
+static irqreturn_t tr_interrupt(int irq, void *dev_id, struct pt_regs * regs);
+static irqreturn_t rx_interrupt(int irq, void *dev_id, struct pt_regs * regs);
+#endif
+
+#if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
+     !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
+    (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
+     !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))
+#define SYNC_SER_MANUAL
+#endif
+#ifdef SYNC_SER_MANUAL
+static irqreturn_t manual_interrupt(int irq, void *dev_id, struct pt_regs * regs);
+#endif
+
+/* The ports */
+static struct sync_port ports[]=
+{
+	{
+		.regi_sser             = regi_sser0,
+		.regi_dmaout           = regi_dma4,
+		.regi_dmain            = regi_dma5,
+#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)
+                .use_dma               = 1,
+#else
+                .use_dma               = 0,
+#endif
+	},
+	{
+		.regi_sser             = regi_sser1,
+		.regi_dmaout           = regi_dma6,
+		.regi_dmain            = regi_dma7,
+#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)
+                .use_dma               = 1,
+#else
+                .use_dma               = 0,
+#endif
+	}
+};
+
+#define NUMBER_OF_PORTS (sizeof(ports)/sizeof(sync_port))
+
+static struct file_operations sync_serial_fops = {
+	.owner   = THIS_MODULE,
+	.write   = sync_serial_write,
+	.read    = sync_serial_read,
+	.poll    = sync_serial_poll,
+	.ioctl   = sync_serial_ioctl,
+	.open    = sync_serial_open,
+	.release = sync_serial_release
+};
+
+static int __init etrax_sync_serial_init(void)
+{
+	ports[0].enabled = 0;
+	ports[1].enabled = 0;
+
+	if (register_chrdev(SYNC_SERIAL_MAJOR,"sync serial", &sync_serial_fops) <0 )
+	{
+		printk("unable to get major for synchronous serial port\n");
+		return -EBUSY;
+	}
+
+	/* Initialize Ports */
+#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0)
+	if (crisv32_pinmux_alloc_fixed(pinmux_sser0))
+	{
+		printk("Unable to allocate pins for syncrhronous serial port 0\n");
+		return -EIO;
+	}
+	ports[0].enabled = 1;
+	initialize_port(0);
+#endif
+
+#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1)
+	if (crisv32_pinmux_alloc_fixed(pinmux_sser1))
+	{
+		printk("Unable to allocate pins for syncrhronous serial port 0\n");
+		return -EIO;
+	}
+	ports[1].enabled = 1;
+	initialize_port(1);
+#endif
+
+	printk("ETRAX FS synchronous serial port driver\n");
+	return 0;
+}
+
+static void __init initialize_port(int portnbr)
+{
+	struct sync_port* port = &ports[portnbr];
+	reg_sser_rw_cfg cfg = {0};
+	reg_sser_rw_frm_cfg frm_cfg = {0};
+	reg_sser_rw_tr_cfg tr_cfg = {0};
+	reg_sser_rw_rec_cfg rec_cfg = {0};
+
+	DEBUG(printk("Init sync serial port %d\n", portnbr));
+
+	port->port_nbr = portnbr;
+	port->init_irqs = 1;
+
+	port->outp = port->out_buffer;
+	port->output = 1;
+	port->input = 0;
+
+	port->readp = port->flip;
+	port->writep = port->flip;
+	port->in_buffer_size = IN_BUFFER_SIZE;
+	port->inbufchunk = IN_DESCR_SIZE;
+	port->next_rx_desc = &port->in_descr[0];
+	port->prev_rx_desc = &port->in_descr[NUM_IN_DESCR-1];
+	port->prev_rx_desc->eol = 1;
+
+	init_waitqueue_head(&port->out_wait_q);
+	init_waitqueue_head(&port->in_wait_q);
+
+	spin_lock_init(&port->lock);
+
+	cfg.out_clk_src = regk_sser_intern_clk;
+	cfg.out_clk_pol = regk_sser_pos;
+	cfg.clk_od_mode = regk_sser_no;
+	cfg.clk_dir = regk_sser_out;
+	cfg.gate_clk = regk_sser_no;
+	cfg.base_freq = regk_sser_f29_493;
+	cfg.clk_div = 256;
+	REG_WR(sser, port->regi_sser, rw_cfg, cfg);
+
+	frm_cfg.wordrate = DEFAULT_WORD_RATE;
+	frm_cfg.type = regk_sser_edge;
+	frm_cfg.frame_pin_dir = regk_sser_out;
+	frm_cfg.frame_pin_use = regk_sser_frm;
+	frm_cfg.status_pin_dir = regk_sser_in;
+	frm_cfg.status_pin_use = regk_sser_hold;
+	frm_cfg.out_on = regk_sser_tr;
+	frm_cfg.tr_delay = 1;
+	REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg);
+
+	tr_cfg.urun_stop = regk_sser_no;
+	tr_cfg.sample_size = 7;
+	tr_cfg.sh_dir = regk_sser_msbfirst;
+	tr_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no;
+	tr_cfg.rate_ctrl = regk_sser_bulk;
+	tr_cfg.data_pin_use = regk_sser_dout;
+	tr_cfg.bulk_wspace = 1;
+	REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
+
+	rec_cfg.sample_size = 7;
+	rec_cfg.sh_dir = regk_sser_msbfirst;
+	rec_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no;
+	rec_cfg.fifo_thr = regk_sser_inf;
+	REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
+}
+
+static inline int sync_data_avail(struct sync_port *port)
+{
+	int avail;
+	unsigned char *start;
+	unsigned char *end;
+
+	start = (unsigned char*)port->readp; /* cast away volatile */
+	end = (unsigned char*)port->writep;  /* cast away volatile */
+	/* 0123456789  0123456789
+	 *  -----      -    -----
+	 *  ^rp  ^wp    ^wp ^rp
+	 */
+
+  	if (end >= start)
+		avail = end - start;
+	else
+		avail = port->in_buffer_size - (start - end);
+	return avail;
+}
+
+static inline int sync_data_avail_to_end(struct sync_port *port)
+{
+	int avail;
+	unsigned char *start;
+	unsigned char *end;
+
+	start = (unsigned char*)port->readp; /* cast away volatile */
+	end = (unsigned char*)port->writep;  /* cast away volatile */
+	/* 0123456789  0123456789
+	 *  -----           -----
+	 *  ^rp  ^wp    ^wp ^rp
+	 */
+
+  	if (end >= start)
+		avail = end - start;
+	else
+		avail = port->flip + port->in_buffer_size - start;
+	return avail;
+}
+
+static int sync_serial_open(struct inode *inode, struct file *file)
+{
+	int dev = MINOR(inode->i_rdev);
+	sync_port* port;
+	reg_dma_rw_cfg cfg = {.en = regk_dma_yes};
+	reg_dma_rw_intr_mask intr_mask = {.data = regk_dma_yes};
+
+	DEBUG(printk("Open sync serial port %d\n", dev));
+
+	if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
+	{
+		DEBUG(printk("Invalid minor %d\n", dev));
+		return -ENODEV;
+	}
+	port = &ports[dev];
+	/* Allow open this device twice (assuming one reader and one writer) */
+	if (port->busy == 2)
+	{
+		DEBUG(printk("Device is busy.. \n"));
+		return -EBUSY;
+	}
+	if (port->init_irqs) {
+		if (port->use_dma) {
+			if (port == &ports[0]){
+#ifdef SYNC_SER_DMA
+				if(request_irq(DMA4_INTR_VECT,
+					       tr_interrupt,
+					       0,
+					       "synchronous serial 0 dma tr",
+					       &ports[0])) {
+					printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ");
+					return -EBUSY;
+				} else if(request_irq(DMA5_INTR_VECT,
+						      rx_interrupt,
+						      0,
+						      "synchronous serial 1 dma rx",
+						      &ports[0])) {
+					free_irq(DMA4_INTR_VECT, &port[0]);
+					printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ");
+					return -EBUSY;
+				} else if (crisv32_request_dma(SYNC_SER0_TX_DMA_NBR,
+                                                               "synchronous serial 0 dma tr",
+                                                               DMA_VERBOSE_ON_ERROR,
+                                                               0,
+                                                               dma_sser0)) {
+					free_irq(DMA4_INTR_VECT, &port[0]);
+					free_irq(DMA5_INTR_VECT, &port[0]);
+					printk(KERN_CRIT "Can't allocate sync serial port 0 TX DMA channel");
+					return -EBUSY;
+				} else if (crisv32_request_dma(SYNC_SER0_RX_DMA_NBR,
+                                                               "synchronous serial 0 dma rec",
+                                                               DMA_VERBOSE_ON_ERROR,
+                                                               0,
+                                                               dma_sser0)) {
+					crisv32_free_dma(SYNC_SER0_TX_DMA_NBR);
+					free_irq(DMA4_INTR_VECT, &port[0]);
+					free_irq(DMA5_INTR_VECT, &port[0]);
+					printk(KERN_CRIT "Can't allocate sync serial port 1 RX DMA channel");
+					return -EBUSY;
+				}
+#endif
+			}
+			else if (port == &ports[1]){
+#ifdef SYNC_SER_DMA
+				if (request_irq(DMA6_INTR_VECT,
+						tr_interrupt,
+						0,
+						"synchronous serial 1 dma tr",
+						&ports[1])) {
+					printk(KERN_CRIT "Can't allocate sync serial port 1 IRQ");
+					return -EBUSY;
+				} else if (request_irq(DMA7_INTR_VECT,
+						       rx_interrupt,
+						       0,
+						       "synchronous serial 1 dma rx",
+						       &ports[1])) {
+					free_irq(DMA6_INTR_VECT, &ports[1]);
+					printk(KERN_CRIT "Can't allocate sync serial port 3 IRQ");
+					return -EBUSY;
+				} else if (crisv32_request_dma(SYNC_SER1_TX_DMA_NBR,
+                                                               "synchronous serial 1 dma tr",
+                                                               DMA_VERBOSE_ON_ERROR,
+                                                               0,
+                                                               dma_sser1)) {
+					free_irq(21, &ports[1]);
+					free_irq(20, &ports[1]);
+					printk(KERN_CRIT "Can't allocate sync serial port 3 TX DMA channel");
+					return -EBUSY;
+				} else if (crisv32_request_dma(SYNC_SER1_RX_DMA_NBR,
+							    "synchronous serial 3 dma rec",
+							    DMA_VERBOSE_ON_ERROR,
+							    0,
+							    dma_sser1)) {
+					crisv32_free_dma(SYNC_SER1_TX_DMA_NBR);
+					free_irq(DMA6_INTR_VECT, &ports[1]);
+					free_irq(DMA7_INTR_VECT, &ports[1]);
+					printk(KERN_CRIT "Can't allocate sync serial port 3 RX DMA channel");
+					return -EBUSY;
+				}
+#endif
+			}
+
+                        /* Enable DMAs */
+			REG_WR(dma, port->regi_dmain, rw_cfg, cfg);
+			REG_WR(dma, port->regi_dmaout, rw_cfg, cfg);
+			/* Enable DMA IRQs */
+			REG_WR(dma, port->regi_dmain, rw_intr_mask, intr_mask);
+			REG_WR(dma, port->regi_dmaout, rw_intr_mask, intr_mask);
+			/* Set up wordsize = 2 for DMAs. */
+			DMA_WR_CMD (port->regi_dmain, regk_dma_set_w_size1);
+			DMA_WR_CMD (port->regi_dmaout, regk_dma_set_w_size1);
+
+			start_dma_in(port);
+			port->init_irqs = 0;
+		} else { /* !port->use_dma */
+#ifdef SYNC_SER_MANUAL
+			if (port == &ports[0]) {
+				if (request_irq(SSER0_INTR_VECT,
+						manual_interrupt,
+						0,
+						"synchronous serial manual irq",
+						&ports[0])) {
+					printk("Can't allocate sync serial manual irq");
+					return -EBUSY;
+				}
+			} else if (port == &ports[1]) {
+				if (request_irq(SSER1_INTR_VECT,
+						manual_interrupt,
+						0,
+						"synchronous serial manual irq",
+						&ports[1])) {
+					printk(KERN_CRIT "Can't allocate sync serial manual irq");
+					return -EBUSY;
+				}
+			}
+			port->init_irqs = 0;
+#else
+			panic("sync_serial: Manual mode not supported.\n");
+#endif /* SYNC_SER_MANUAL */
+		}
+	} /* port->init_irqs */
+
+	port->busy++;
+	return 0;
+}
+
+static int sync_serial_release(struct inode *inode, struct file *file)
+{
+	int dev = MINOR(inode->i_rdev);
+	sync_port* port;
+
+	if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
+	{
+		DEBUG(printk("Invalid minor %d\n", dev));
+		return -ENODEV;
+	}
+	port = &ports[dev];
+	if (port->busy)
+		port->busy--;
+	if (!port->busy)
+          /* XXX */ ;
+	return 0;
+}
+
+static unsigned int sync_serial_poll(struct file *file, poll_table *wait)
+{
+	int dev = MINOR(file->f_dentry->d_inode->i_rdev);
+	unsigned int mask = 0;
+	sync_port* port;
+	DEBUGPOLL( static unsigned int prev_mask = 0; );
+
+	port = &ports[dev];
+	poll_wait(file, &port->out_wait_q, wait);
+	poll_wait(file, &port->in_wait_q, wait);
+	/* Some room to write */
+	if (port->out_count < OUT_BUFFER_SIZE)
+		mask |=  POLLOUT | POLLWRNORM;
+	/* At least an inbufchunk of data */
+	if (sync_data_avail(port) >= port->inbufchunk)
+		mask |= POLLIN | POLLRDNORM;
+
+	DEBUGPOLL(if (mask != prev_mask)
+	      printk("sync_serial_poll: mask 0x%08X %s %s\n", mask,
+		     mask&POLLOUT?"POLLOUT":"", mask&POLLIN?"POLLIN":"");
+	      prev_mask = mask;
+	      );
+	return mask;
+}
+
+static int sync_serial_ioctl(struct inode *inode, struct file *file,
+		  unsigned int cmd, unsigned long arg)
+{
+	int return_val = 0;
+	int dev = MINOR(file->f_dentry->d_inode->i_rdev);
+	sync_port* port;
+	reg_sser_rw_tr_cfg tr_cfg;
+	reg_sser_rw_rec_cfg rec_cfg;
+	reg_sser_rw_frm_cfg frm_cfg;
+	reg_sser_rw_cfg gen_cfg;
+	reg_sser_rw_intr_mask intr_mask;
+
+	if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
+	{
+		DEBUG(printk("Invalid minor %d\n", dev));
+		return -1;
+	}
+        port = &ports[dev];
+	spin_lock_irq(&port->lock);
+
+	tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
+	rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
+	frm_cfg = REG_RD(sser, port->regi_sser, rw_frm_cfg);
+	gen_cfg = REG_RD(sser, port->regi_sser, rw_cfg);
+	intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
+
+	switch(cmd)
+	{
+	case SSP_SPEED:
+		if (GET_SPEED(arg) == CODEC)
+		{
+			gen_cfg.base_freq = regk_sser_f32;
+			/* FREQ = 0 => 4 MHz => clk_div = 7*/
+			gen_cfg.clk_div = 6 + (1 << GET_FREQ(arg));
+		}
+		else
+		{
+			gen_cfg.base_freq = regk_sser_f29_493;
+			switch (GET_SPEED(arg))
+			{
+				case SSP150:
+					gen_cfg.clk_div = 29493000 / (150 * 8) - 1;
+					break;
+				case SSP300:
+					gen_cfg.clk_div = 29493000 / (300 * 8) - 1;
+					break;
+				case SSP600:
+					gen_cfg.clk_div = 29493000 / (600 * 8) - 1;
+					break;
+				case SSP1200:
+					gen_cfg.clk_div = 29493000 / (1200 * 8) - 1;
+					break;
+				case SSP2400:
+					gen_cfg.clk_div = 29493000 / (2400 * 8) - 1;
+					break;
+				case SSP4800:
+					gen_cfg.clk_div = 29493000 / (4800 * 8) - 1;
+					break;
+				case SSP9600:
+					gen_cfg.clk_div = 29493000 / (9600 * 8) - 1;
+					break;
+				case SSP19200:
+					gen_cfg.clk_div = 29493000 / (19200 * 8) - 1;
+					break;
+				case SSP28800:
+					gen_cfg.clk_div = 29493000 / (28800 * 8) - 1;
+					break;
+				case SSP57600:
+					gen_cfg.clk_div = 29493000 / (57600 * 8) - 1;
+					break;
+				case SSP115200:
+					gen_cfg.clk_div = 29493000 / (115200 * 8) - 1;
+					break;
+				case SSP230400:
+					gen_cfg.clk_div = 29493000 / (230400 * 8) - 1;
+					break;
+				case SSP460800:
+					gen_cfg.clk_div = 29493000 / (460800 * 8) - 1;
+					break;
+				case SSP921600:
+					gen_cfg.clk_div = 29493000 / (921600 * 8) - 1;
+					break;
+				case SSP3125000:
+					gen_cfg.base_freq = regk_sser_f100;
+					gen_cfg.clk_div = 100000000 / (3125000 * 8) - 1;
+					break;
+
+			}
+		}
+		frm_cfg.wordrate = GET_WORD_RATE(arg);
+
+		break;
+	case SSP_MODE:
+		switch(arg)
+		{
+			case MASTER_OUTPUT:
+				port->output = 1;
+				port->input = 0;
+				gen_cfg.clk_dir = regk_sser_out;
+				break;
+			case SLAVE_OUTPUT:
+				port->output = 1;
+				port->input = 0;
+				gen_cfg.clk_dir = regk_sser_in;
+				break;
+			case MASTER_INPUT:
+				port->output = 0;
+				port->input = 1;
+				gen_cfg.clk_dir = regk_sser_out;
+				break;
+			case SLAVE_INPUT:
+				port->output = 0;
+				port->input = 1;
+				gen_cfg.clk_dir = regk_sser_in;
+				break;
+			case MASTER_BIDIR:
+				port->output = 1;
+				port->input = 1;
+				gen_cfg.clk_dir = regk_sser_out;
+				break;
+			case SLAVE_BIDIR:
+				port->output = 1;
+				port->input = 1;
+				gen_cfg.clk_dir = regk_sser_in;
+				break;
+			default:
+				spin_unlock_irq(&port->lock);
+				return -EINVAL;
+
+		}
+		if (!port->use_dma || (arg == MASTER_OUTPUT || arg == SLAVE_OUTPUT))
+			intr_mask.rdav = regk_sser_yes;
+		break;
+	case SSP_FRAME_SYNC:
+		if (arg & NORMAL_SYNC)
+			frm_cfg.tr_delay = 1;
+		else if (arg & EARLY_SYNC)
+			frm_cfg.tr_delay = 0;
+
+		tr_cfg.bulk_wspace = frm_cfg.tr_delay;
+		frm_cfg.early_wend = regk_sser_yes;
+		if (arg & BIT_SYNC)
+			frm_cfg.type = regk_sser_edge;
+		else if (arg & WORD_SYNC)
+			frm_cfg.type = regk_sser_level;
+		else if (arg & EXTENDED_SYNC)
+			frm_cfg.early_wend = regk_sser_no;
+
+		if (arg & SYNC_ON)
+			frm_cfg.frame_pin_use = regk_sser_frm;
+		else if (arg & SYNC_OFF)
+			frm_cfg.frame_pin_use = regk_sser_gio0;
+
+		if (arg & WORD_SIZE_8)
+			rec_cfg.sample_size = tr_cfg.sample_size = 7;
+		else if (arg & WORD_SIZE_12)
+			rec_cfg.sample_size = tr_cfg.sample_size = 11;
+		else if (arg & WORD_SIZE_16)
+			rec_cfg.sample_size = tr_cfg.sample_size = 15;
+		else if (arg & WORD_SIZE_24)
+			rec_cfg.sample_size = tr_cfg.sample_size = 23;
+		else if (arg & WORD_SIZE_32)
+			rec_cfg.sample_size = tr_cfg.sample_size = 31;
+
+		if (arg & BIT_ORDER_MSB)
+			rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst;
+		else if (arg & BIT_ORDER_LSB)
+			rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_lsbfirst;
+
+		if (arg & FLOW_CONTROL_ENABLE)
+			rec_cfg.fifo_thr = regk_sser_thr16;
+		else if (arg & FLOW_CONTROL_DISABLE)
+			rec_cfg.fifo_thr = regk_sser_inf;
+
+		if (arg & CLOCK_NOT_GATED)
+			gen_cfg.gate_clk = regk_sser_no;
+		else if (arg & CLOCK_GATED)
+			gen_cfg.gate_clk = regk_sser_yes;
+
+		break;
+	case SSP_IPOLARITY:
+		/* NOTE!! negedge is considered NORMAL */
+		if (arg & CLOCK_NORMAL)
+			rec_cfg.clk_pol = regk_sser_neg;
+		else if (arg & CLOCK_INVERT)
+			rec_cfg.clk_pol = regk_sser_pos;
+
+		if (arg & FRAME_NORMAL)
+			frm_cfg.level = regk_sser_pos_hi;
+		else if (arg & FRAME_INVERT)
+			frm_cfg.level = regk_sser_neg_lo;
+
+		if (arg & STATUS_NORMAL)
+			gen_cfg.hold_pol = regk_sser_pos;
+		else if (arg & STATUS_INVERT)
+			gen_cfg.hold_pol = regk_sser_neg;
+		break;
+	case SSP_OPOLARITY:
+		if (arg & CLOCK_NORMAL)
+			gen_cfg.out_clk_pol = regk_sser_neg;
+		else if (arg & CLOCK_INVERT)
+			gen_cfg.out_clk_pol = regk_sser_pos;
+
+		if (arg & FRAME_NORMAL)
+			frm_cfg.level = regk_sser_pos_hi;
+		else if (arg & FRAME_INVERT)
+			frm_cfg.level = regk_sser_neg_lo;
+
+		if (arg & STATUS_NORMAL)
+			gen_cfg.hold_pol = regk_sser_pos;
+		else if (arg & STATUS_INVERT)
+			gen_cfg.hold_pol = regk_sser_neg;
+		break;
+	case SSP_SPI:
+		rec_cfg.fifo_thr = regk_sser_inf;
+		rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst;
+		rec_cfg.sample_size = tr_cfg.sample_size = 7;
+		frm_cfg.frame_pin_use = regk_sser_frm;
+		frm_cfg.type = regk_sser_level;
+		frm_cfg.tr_delay = 1;
+		frm_cfg.level = regk_sser_neg_lo;
+		if (arg & SPI_SLAVE)
+		{
+			rec_cfg.clk_pol = regk_sser_neg;
+			gen_cfg.clk_dir = regk_sser_in;
+			port->input = 1;
+			port->output = 0;
+		}
+		else
+		{
+			gen_cfg.out_clk_pol = regk_sser_pos;
+			port->input = 0;
+			port->output = 1;
+			gen_cfg.clk_dir = regk_sser_out;
+		}
+		break;
+	case SSP_INBUFCHUNK:
+		break;
+	default:
+		return_val = -1;
+	}
+
+
+	if (port->started)
+	{
+		tr_cfg.tr_en = port->output;
+		rec_cfg.rec_en = port->input;
+	}
+
+	REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
+	REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
+	REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg);
+	REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
+	REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg);
+
+	spin_unlock_irq(&port->lock);
+	return return_val;
+}
+
+static ssize_t sync_serial_write(struct file * file, const char * buf,
+                                 size_t count, loff_t *ppos)
+{
+	int dev = MINOR(file->f_dentry->d_inode->i_rdev);
+	DECLARE_WAITQUEUE(wait, current);
+	sync_port *port;
+	unsigned long c, c1;
+	unsigned long free_outp;
+	unsigned long outp;
+	unsigned long out_buffer;
+	unsigned long flags;
+
+	if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
+	{
+		DEBUG(printk("Invalid minor %d\n", dev));
+		return -ENODEV;
+	}
+	port = &ports[dev];
+
+	DEBUGWRITE(printk("W d%d c %lu (%d/%d)\n", port->port_nbr, count, port->out_count, OUT_BUFFER_SIZE));
+	/* Space to end of buffer */
+	/*
+	 * out_buffer <c1>012345<-   c    ->OUT_BUFFER_SIZE
+	 *            outp^    +out_count
+	                        ^free_outp
+	 * out_buffer 45<-     c      ->0123OUT_BUFFER_SIZE
+	 *             +out_count   outp^
+	 *              free_outp
+	 *
+	 */
+
+	/* Read variables that may be updated by interrupts */
+	spin_lock_irqsave(&port->lock, flags);
+	count = count > OUT_BUFFER_SIZE - port->out_count ? OUT_BUFFER_SIZE  - port->out_count : count;
+	outp = (unsigned long)port->outp;
+	free_outp = outp + port->out_count;
+	spin_unlock_irqrestore(&port->lock, flags);
+	out_buffer = (unsigned long)port->out_buffer;
+
+	/* Find out where and how much to write */
+	if (free_outp >= out_buffer + OUT_BUFFER_SIZE)
+		free_outp -= OUT_BUFFER_SIZE;
+	if (free_outp >= outp)
+		c = out_buffer + OUT_BUFFER_SIZE - free_outp;
+	else
+		c = outp - free_outp;
+	if (c > count)
+		c = count;
+
+//	DEBUGWRITE(printk("w op %08lX fop %08lX c %lu\n", outp, free_outp, c));
+	if (copy_from_user((void*)free_outp, buf, c))
+		return -EFAULT;
+
+	if (c != count) {
+		buf += c;
+		c1 = count - c;
+		DEBUGWRITE(printk("w2 fi %lu c %lu c1 %lu\n", free_outp-out_buffer, c, c1));
+		if (copy_from_user((void*)out_buffer, buf, c1))
+			return -EFAULT;
+	}
+	spin_lock_irqsave(&port->lock, flags);
+	port->out_count += count;
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	/* Make sure transmitter/receiver is running */
+	if (!port->started)
+	{
+		reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
+		reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
+		reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
+		cfg.en = regk_sser_yes;
+		tr_cfg.tr_en = port->output;
+		rec_cfg.rec_en = port->input;
+		REG_WR(sser, port->regi_sser, rw_cfg, cfg);
+		REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
+		REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
+		port->started = 1;
+	}
+
+	if (file->f_flags & O_NONBLOCK)	{
+		spin_lock_irqsave(&port->lock, flags);
+		if (!port->tr_running) {
+			if (!port->use_dma) {
+				reg_sser_rw_intr_mask intr_mask;
+				intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
+				/* Start sender by writing data */
+				send_word(port);
+				/* and enable transmitter ready IRQ */
+				intr_mask.trdy = 1;
+				REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
+			} else {
+				start_dma(port, (unsigned char* volatile )port->outp, c);
+			}
+		}
+		spin_unlock_irqrestore(&port->lock, flags);
+		DEBUGWRITE(printk("w d%d c %lu NB\n",
+				  port->port_nbr, count));
+		return count;
+	}
+
+	/* Sleep until all sent */
+
+	add_wait_queue(&port->out_wait_q, &wait);
+	set_current_state(TASK_INTERRUPTIBLE);
+	spin_lock_irqsave(&port->lock, flags);
+	if (!port->tr_running) {
+		if (!port->use_dma) {
+			reg_sser_rw_intr_mask intr_mask;
+			intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
+			/* Start sender by writing data */
+			send_word(port);
+			/* and enable transmitter ready IRQ */
+			intr_mask.trdy = 1;
+			REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
+		} else {
+			start_dma(port, port->outp, c);
+		}
+	}
+	spin_unlock_irqrestore(&port->lock, flags);
+	schedule();
+	set_current_state(TASK_RUNNING);
+	remove_wait_queue(&port->out_wait_q, &wait);
+	if (signal_pending(current))
+	{
+		return -EINTR;
+	}
+	DEBUGWRITE(printk("w d%d c %lu\n", port->port_nbr, count));
+	return count;
+}
+
+static ssize_t sync_serial_read(struct file * file, char * buf,
+				size_t count, loff_t *ppos)
+{
+	int dev = MINOR(file->f_dentry->d_inode->i_rdev);
+	int avail;
+	sync_port *port;
+	unsigned char* start;
+	unsigned char* end;
+	unsigned long flags;
+
+	if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
+	{
+		DEBUG(printk("Invalid minor %d\n", dev));
+		return -ENODEV;
+	}
+	port = &ports[dev];
+
+	DEBUGREAD(printk("R%d c %d ri %lu wi %lu /%lu\n", dev, count, port->readp - port->flip, port->writep - port->flip, port->in_buffer_size));
+
+	if (!port->started)
+	{
+		reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
+		reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
+		reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
+		cfg.en = regk_sser_yes;
+		tr_cfg.tr_en = regk_sser_yes;
+		rec_cfg.rec_en = regk_sser_yes;
+		REG_WR(sser, port->regi_sser, rw_cfg, cfg);
+		REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
+		REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
+		port->started = 1;
+	}
+
+
+	/* Calculate number of available bytes */
+	/* Save pointers to avoid that they are modified by interrupt */
+	spin_lock_irqsave(&port->lock, flags);
+	start = (unsigned char*)port->readp; /* cast away volatile */
+	end = (unsigned char*)port->writep;  /* cast away volatile */
+	spin_unlock_irqrestore(&port->lock, flags);
+	while ((start == end) && !port->full) /* No data */
+	{
+		if (file->f_flags & O_NONBLOCK)
+		{
+			return -EAGAIN;
+		}
+
+		interruptible_sleep_on(&port->in_wait_q);
+		if (signal_pending(current))
+		{
+			return -EINTR;
+		}
+		spin_lock_irqsave(&port->lock, flags);
+		start = (unsigned char*)port->readp; /* cast away volatile */
+		end = (unsigned char*)port->writep;  /* cast away volatile */
+		spin_unlock_irqrestore(&port->lock, flags);
+	}
+
+	/* Lazy read, never return wrapped data. */
+	if (port->full)
+		avail = port->in_buffer_size;
+	else if (end > start)
+		avail = end - start;
+	else
+		avail = port->flip + port->in_buffer_size - start;
+
+	count = count > avail ? avail : count;
+	if (copy_to_user(buf, start, count))
+		return -EFAULT;
+	/* Disable interrupts while updating readp */
+	spin_lock_irqsave(&port->lock, flags);
+	port->readp += count;
+	if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */
+		port->readp = port->flip;
+	port->full = 0;
+	spin_unlock_irqrestore(&port->lock, flags);
+	DEBUGREAD(printk("r %d\n", count));
+	return count;
+}
+
+static void send_word(sync_port* port)
+{
+	reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
+	reg_sser_rw_tr_data tr_data =  {0};
+
+	switch(tr_cfg.sample_size)
+	{
+	 case 8:
+		 port->out_count--;
+		 tr_data.data = *port->outp++;
+		 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
+		 if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
+			 port->outp = port->out_buffer;
+		 break;
+	 case 12:
+	 {
+		int data = (*port->outp++) << 8;
+		data |= *port->outp++;
+		port->out_count-=2;
+		tr_data.data = data;
+		REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
+		if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
+			port->outp = port->out_buffer;
+	}
+	break;
+	case 16:
+		port->out_count-=2;
+		tr_data.data = *(unsigned short *)port->outp;
+		REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
+		port->outp+=2;
+		if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
+			port->outp = port->out_buffer;
+		break;
+	case 24:
+		port->out_count-=3;
+		tr_data.data = *(unsigned short *)port->outp;
+		REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
+		port->outp+=2;
+		tr_data.data = *port->outp++;
+		REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
+		if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
+			port->outp = port->out_buffer;
+		break;
+	case 32:
+		port->out_count-=4;
+		tr_data.data = *(unsigned short *)port->outp;
+		REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
+		port->outp+=2;
+		tr_data.data = *(unsigned short *)port->outp;
+		REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
+		port->outp+=2;
+		if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
+			port->outp = port->out_buffer;
+		break;
+	}
+}
+
+
+static void start_dma(struct sync_port* port, const char* data, int count)
+{
+	port->tr_running = 1;