[PATCH 09/47] Update CRISv32 synchronous serial driver.

Jesper Nilsson
2007-12-06T12:44:42Z

Now uses a DMA descriptor ring, which should avoid any unnecessary
pauses in the streams.

Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
---
arch/cris/arch-v32/drivers/sync_serial.c | 940 +++++++++++++++++++-----------
1 files changed, 599 insertions(+), 341 deletions(-)

diff --git a/arch/cris/arch-v32/drivers/sync_serial.c b/arch/cris/arch-v32/drivers/sync_serial.c
index d581b0a..eddb987 100644
--- a/arch/cris/arch-v32/drivers/sync_serial.c
+++ b/arch/cris/arch-v32/drivers/sync_serial.c
@@ -1,5 +1,5 @@
/*
- * Simple synchronous serial port driver for ETRAX FS.
+ * Simple synchronous serial port driver for ETRAX FS and Artpec-3.
*
* Copyright (c) 2005 Axis Communications AB
*
@@ -21,17 +21,18 @@
#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 <dma.h>
+#include <pinmux.h>
+#include <hwregs/reg_rdwr.h>
+#include <hwregs/sser_defs.h>
+#include <hwregs/dma_defs.h>
+#include <hwregs/dma.h>
+#include <hwregs/intr_vect_defs.h>
+#include <hwregs/intr_vect.h>
+#include <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 */
@@ -63,8 +64,10 @@
/* 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 NBR_IN_DESCR (IN_BUFFER_SIZE/IN_DESCR_SIZE)
+
+#define OUT_BUFFER_SIZE 1024*8
+#define NBR_OUT_DESCR 8

#define DEFAULT_FRAME_RATE 0
#define DEFAULT_WORD_RATE 7
@@ -78,6 +81,8 @@
#define DEBUGPOLL(x)
#define DEBUGRXINT(x)
#define DEBUGTXINT(x)
+#define DEBUGTRDMA(x)
+#define DEBUGOUTBUF(x)

typedef struct sync_port
{
@@ -97,10 +102,11 @@ typedef struct sync_port
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 */
+ /* Next byte to be read by application */
+ volatile unsigned char *volatile readp;
+ /* Next byte to be written by etrax */
+ volatile unsigned char *volatile writep;
+
unsigned int in_buffer_size;
unsigned int inbufchunk;
unsigned char out_buffer[OUT_BUFFER_SIZE] __attribute__ ((aligned(32)));
@@ -108,11 +114,30 @@ typedef struct sync_port
unsigned char flip[IN_BUFFER_SIZE] __attribute__ ((aligned(32)));
struct dma_descr_data* next_rx_desc;
struct dma_descr_data* prev_rx_desc;
+
+ /* Pointer to the first available descriptor in the ring,
+ * unless active_tr_descr == catch_tr_descr and a dma
+ * transfer is active */
+ struct dma_descr_data *active_tr_descr;
+
+ /* Pointer to the first allocated descriptor in the ring */
+ struct dma_descr_data *catch_tr_descr;
+
+ /* Pointer to the descriptor with the current end-of-list */
+ struct dma_descr_data *prev_tr_descr;
int full;

- dma_descr_data in_descr[NUM_IN_DESCR] __attribute__ ((__aligned__(16)));
+ /* Pointer to the first byte being read by DMA
+ * or current position in out_buffer if not using DMA. */
+ unsigned char *out_rd_ptr;
+
+ /* Number of bytes currently locked for being read by DMA */
+ int out_buf_count;
+
+ dma_descr_data in_descr[NBR_IN_DESCR] __attribute__ ((__aligned__(16)));
dma_descr_context in_context __attribute__ ((__aligned__(32)));
- dma_descr_data out_descr __attribute__ ((__aligned__(16)));
+ dma_descr_data out_descr[NBR_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;
@@ -121,7 +146,9 @@ typedef struct sync_port
} sync_port;

static int etrax_sync_serial_init(void);
+#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1)
static void initialize_port(int portnbr);
+#endif
static inline int sync_data_avail(struct sync_port *port);

static int sync_serial_open(struct inode *, struct file*);
@@ -143,11 +170,11 @@ static ssize_t sync_serial_read(struct file *file, char *buf,
#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_out(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);
+static irqreturn_t tr_interrupt(int irq, void *dev_id);
+static irqreturn_t rx_interrupt(int irq, void *dev_id);
#endif

#if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
@@ -157,22 +184,49 @@ static irqreturn_t rx_interrupt(int irq, void *dev_id, struct pt_regs * regs);
#define SYNC_SER_MANUAL
#endif
#ifdef SYNC_SER_MANUAL
-static irqreturn_t manual_interrupt(int irq, void *dev_id, struct pt_regs * regs);
+static irqreturn_t manual_interrupt(int irq, void *dev_id);
+#endif
+
+#ifdef CONFIG_ETRAXFS /* ETRAX FS */
+#define OUT_DMA_NBR 4
+#define IN_DMA_NBR 5
+#define PINMUX_SSER pinmux_sser0
+#define SYNCSER_INST regi_sser0
+#define SYNCSER_INTR_VECT SSER0_INTR_VECT
+#define OUT_DMA_INST regi_dma4
+#define IN_DMA_INST regi_dma5
+#define DMA_OUT_INTR_VECT DMA4_INTR_VECT
+#define DMA_IN_INTR_VECT DMA5_INTR_VECT
+#define REQ_DMA_SYNCSER dma_sser0
+#else /* Artpec-3 */
+#define OUT_DMA_NBR 6
+#define IN_DMA_NBR 7
+#define PINMUX_SSER pinmux_sser
+#define SYNCSER_INST regi_sser
+#define SYNCSER_INTR_VECT SSER_INTR_VECT
+#define OUT_DMA_INST regi_dma6
+#define IN_DMA_INST regi_dma7
+#define DMA_OUT_INTR_VECT DMA6_INTR_VECT
+#define DMA_IN_INTR_VECT DMA7_INTR_VECT
+#define REQ_DMA_SYNCSER dma_sser
#endif

/* The ports */
static struct sync_port ports[]=
{
{
- .regi_sser = regi_sser0,
- .regi_dmaout = regi_dma4,
- .regi_dmain = regi_dma5,
+ .regi_sser = SYNCSER_INST,
+ .regi_dmaout = OUT_DMA_INST,
+ .regi_dmain = IN_DMA_INST,
#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)
.use_dma = 1,
#else
.use_dma = 0,
#endif
- },
+ }
+#ifdef CONFIG_ETRAXFS
+ ,
+
{
.regi_sser = regi_sser1,
.regi_dmaout = regi_dma6,
@@ -183,9 +237,10 @@ static struct sync_port ports[]=
.use_dma = 0,
#endif
}
+#endif
};

-#define NUMBER_OF_PORTS ARRAY_SIZE(ports)
+#define NBR_PORTS ARRAY_SIZE(ports)

static const struct file_operations sync_serial_fops = {
.owner = THIS_MODULE,
@@ -200,19 +255,21 @@ static const struct file_operations sync_serial_fops = {
static int __init etrax_sync_serial_init(void)
{
ports[0].enabled = 0;
+#ifdef CONFIG_ETRAXFS
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");
+#endif
+ if (register_chrdev(SYNC_SERIAL_MAJOR, "sync serial",
+ &sync_serial_fops) < 0) {
+ printk(KERN_WARNING
+ "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");
+ if (crisv32_pinmux_alloc_fixed(PINMUX_SSER)) {
+ printk(KERN_WARNING
+ "Unable to alloc pins for synchronous serial port 0\n");
return -EIO;
}
ports[0].enabled = 1;
@@ -220,33 +277,41 @@ static int __init etrax_sync_serial_init(void)
#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");
+ if (crisv32_pinmux_alloc_fixed(pinmux_sser1)) {
+ printk(KERN_WARNING
+ "Unable to alloc pins for synchronous serial port 0\n");
return -EIO;
}
ports[1].enabled = 1;
initialize_port(1);
#endif

- printk("ETRAX FS synchronous serial port driver\n");
+#ifdef CONFIG_ETRAXFS
+ printk(KERN_INFO "ETRAX FS synchronous serial port driver\n");
+#else
+ printk(KERN_INFO "Artpec-3 synchronous serial port driver\n");
+#endif
return 0;
}

+#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1)
static void __init initialize_port(int portnbr)
{
- struct sync_port* port = &ports[portnbr];
+ int __attribute__((unused)) i;
+ 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));
+ DEBUG(printk(KERN_DEBUG "Init sync serial port %d\n", portnbr));

port->port_nbr = portnbr;
port->init_irqs = 1;

- port->outp = port->out_buffer;
+ port->out_rd_ptr = port->out_buffer;
+ port->out_buf_count = 0;
+
port->output = 1;
port->input = 0;

@@ -255,7 +320,7 @@ static void __init initialize_port(int portnbr)
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 = &port->in_descr[NBR_IN_DESCR-1];
port->prev_rx_desc->eol = 1;

init_waitqueue_head(&port->out_wait_q);
@@ -286,8 +351,13 @@ static void __init initialize_port(int portnbr)
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;
+#if 0
tr_cfg.rate_ctrl = regk_sser_bulk;
tr_cfg.data_pin_use = regk_sser_dout;
+#else
+ tr_cfg.rate_ctrl = regk_sser_iso;
+ tr_cfg.data_pin_use = regk_sser_dout;
+#endif
tr_cfg.bulk_wspace = 1;
REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);

@@ -296,7 +366,29 @@ static void __init initialize_port(int portnbr)
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);
+
+#ifdef SYNC_SER_DMA
+ /* Setup the descriptor ring for dma out/transmit. */
+ for (i = 0; i < NBR_OUT_DESCR; i++) {
+ port->out_descr[i].wait = 0;
+ port->out_descr[i].intr = 1;
+ port->out_descr[i].eol = 0;
+ port->out_descr[i].out_eop = 0;
+ port->out_descr[i].next =
+ (dma_descr_data *)virt_to_phys(&port->out_descr[i+1]);
+ }
+
+ /* Create a ring from the list. */
+ port->out_descr[NBR_OUT_DESCR-1].next =
+ (dma_descr_data *)virt_to_phys(&port->out_descr[0]);
+
+ /* Setup context for traversing the ring. */
+ port->active_tr_descr = &port->out_descr[0];
+ port->prev_tr_descr = &port->out_descr[NBR_OUT_DESCR-1];
+ port->catch_tr_descr = &port->out_descr[0];
+#endif
}
+#endif

static inline int sync_data_avail(struct sync_port *port)
{
@@ -311,7 +403,7 @@ static inline int sync_data_avail(struct sync_port *port)
* ^rp ^wp ^wp ^rp
*/

- if (end >= start)
+ if (end >= start)
avail = end - start;
else
avail = port->in_buffer_size - (start - end);
@@ -331,7 +423,7 @@ static inline int sync_data_avail_to_end(struct sync_port *port)
* ^rp ^wp ^wp ^rp
*/

- if (end >= start)
+ if (end >= start)
avail = end - start;
else
avail = port->flip + port->in_buffer_size - start;
@@ -341,66 +433,69 @@ static inline int sync_data_avail_to_end(struct sync_port *port)
static int sync_serial_open(struct inode *inode, struct file *file)
{
int dev = iminor(inode);
- sync_port* port;
+ 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));
+ DEBUG(printk(KERN_DEBUG "Open sync serial port %d\n", dev));

- if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
+ if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
{
- DEBUG(printk("Invalid minor %d\n", dev));
+ DEBUG(printk(KERN_DEBUG "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"));
+ DEBUG(printk(KERN_DEBUG "Device is busy.. \n"));
return -EBUSY;
}
+
+
if (port->init_irqs) {
if (port->use_dma) {
- if (port == &ports[0]){
+ if (port == &ports[0]) {
#ifdef SYNC_SER_DMA
- if(request_irq(DMA4_INTR_VECT,
- tr_interrupt,
- 0,
- "synchronous serial 0 dma tr",
- &ports[0])) {
+ if (request_irq(DMA_OUT_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]);
+ } else if (request_irq(DMA_IN_INTR_VECT,
+ rx_interrupt,
+ 0,
+ "synchronous serial 1 dma rx",
+ &ports[0])) {
+ free_irq(DMA_OUT_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]);
+ } else if (crisv32_request_dma(OUT_DMA_NBR,
+ "synchronous serial 0 dma tr",
+ DMA_VERBOSE_ON_ERROR,
+ 0,
+ REQ_DMA_SYNCSER)) {
+ free_irq(DMA_OUT_INTR_VECT, &port[0]);
+ free_irq(DMA_IN_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]);
+ } else if (crisv32_request_dma(IN_DMA_NBR,
+ "synchronous serial 0 dma rec",
+ DMA_VERBOSE_ON_ERROR,
+ 0,
+ REQ_DMA_SYNCSER)) {
+ crisv32_free_dma(OUT_DMA_NBR);
+ free_irq(DMA_OUT_INTR_VECT, &port[0]);
+ free_irq(DMA_IN_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 CONFIG_ETRAXFS
+ else if (port == &ports[1]) {
#ifdef SYNC_SER_DMA
if (request_irq(DMA6_INTR_VECT,
tr_interrupt,
@@ -417,20 +512,22 @@ static int sync_serial_open(struct inode *inode, struct file *file)
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]);
+ } else if (crisv32_request_dma(
+ SYNC_SER1_TX_DMA_NBR,
+ "synchronous serial 1 dma tr",
+ DMA_VERBOSE_ON_ERROR,
+ 0,
+ dma_sser1)) {
+ free_irq(DMA6_INTR_VECT, &ports[1]);
+ free_irq(DMA7_INTR_VECT, &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)) {
+ } 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]);
@@ -439,14 +536,14 @@ static int sync_serial_open(struct inode *inode, struct file *file)
}
#endif
}
-
+#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. */
+ /* Set up wordsize = 1 for DMAs. */
DMA_WR_CMD (port->regi_dmain, regk_dma_set_w_size1);
DMA_WR_CMD (port->regi_dmaout, regk_dma_set_w_size1);

@@ -455,7 +552,7 @@ static int sync_serial_open(struct inode *inode, struct file *file)
} else { /* !port->use_dma */
#ifdef SYNC_SER_MANUAL
if (port == &ports[0]) {
- if (request_irq(SSER0_INTR_VECT,
+ if (request_irq(SYNCSER_INTR_VECT,
manual_interrupt,
0,
"synchronous serial manual irq",
@@ -463,7 +560,9 @@ static int sync_serial_open(struct inode *inode, struct file *file)
printk("Can't allocate sync serial manual irq");
return -EBUSY;
}
- } else if (port == &ports[1]) {
+ }
+#ifdef CONFIG_ETRAXFS
+ else if (port == &ports[1]) {
if (request_irq(SSER1_INTR_VECT,
manual_interrupt,
0,
@@ -473,11 +572,13 @@ static int sync_serial_open(struct inode *inode, struct file *file)
return -EBUSY;
}
}
+#endif
port->init_irqs = 0;
#else
panic("sync_serial: Manual mode not supported.\n");
#endif /* SYNC_SER_MANUAL */
}
+
} /* port->init_irqs */

port->busy++;
@@ -487,9 +588,9 @@ static int sync_serial_open(struct inode *inode, struct file *file)
static int sync_serial_release(struct inode *inode, struct file *file)
{
int dev = iminor(inode);
- sync_port* port;
+ sync_port *port;

- if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
+ if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
{
DEBUG(printk("Invalid minor %d\n", dev));
return -ENODEV;
@@ -506,17 +607,37 @@ static unsigned int sync_serial_poll(struct file *file, poll_table *wait)
{
int dev = iminor(file->f_path.dentry->d_inode);
unsigned int mask = 0;
- sync_port* port;
+ sync_port *port;
DEBUGPOLL( static unsigned int prev_mask = 0; );

port = &ports[dev];
+
+ if (!port->started) {
+ reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
+ reg_sser_rw_rec_cfg rec_cfg =
+ REG_RD(sser, port->regi_sser, rw_rec_cfg);
+ cfg.en = regk_sser_yes;
+ rec_cfg.rec_en = port->input;
+ REG_WR(sser, port->regi_sser, rw_cfg, cfg);
+ REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
+ port->started = 1;
+ }
+
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)
+
+ /* No active transfer, descriptors are available */
+ if (port->output && !port->tr_running)
+ mask |= POLLOUT | POLLWRNORM;
+
+ /* Descriptor and buffer space available. */
+ if (port->output &&
+ port->active_tr_descr != port->catch_tr_descr &&
+ port->out_buf_count < OUT_BUFFER_SIZE)
mask |= POLLOUT | POLLWRNORM;
+
/* At least an inbufchunk of data */
- if (sync_data_avail(port) >= port->inbufchunk)
+ if (port->input && sync_data_avail(port) >= port->inbufchunk)
mask |= POLLIN | POLLRDNORM;

DEBUGPOLL(if (mask != prev_mask)
@@ -531,15 +652,16 @@ static int sync_serial_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int return_val = 0;
+ int dma_w_size = regk_dma_set_w_size1;
int dev = iminor(file->f_path.dentry->d_inode);
- sync_port* port;
+ 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)
+ if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
{
DEBUG(printk("Invalid minor %d\n", dev));
return -1;
@@ -558,61 +680,81 @@ static int sync_serial_ioctl(struct inode *inode, struct file *file,
case SSP_SPEED:
if (GET_SPEED(arg) == CODEC)
{
+ unsigned int freq;
+
gen_cfg.base_freq = regk_sser_f32;
- /* FREQ = 0 => 4 MHz => clk_div = 7*/
- gen_cfg.clk_div = 6 + (1 << GET_FREQ(arg));
- }
- else
- {
+
+ /* Clock divider will internally be
+ * gen_cfg.clk_div + 1.
+ */
+
+ freq = GET_FREQ(arg);
+ switch (freq) {
+ case FREQ_32kHz:
+ case FREQ_64kHz:
+ case FREQ_128kHz:
+ case FREQ_256kHz:
+ gen_cfg.clk_div = 125 *
+ (1 << (freq - FREQ_256kHz)) - 1;
+ break;
+ case FREQ_512kHz:
+ gen_cfg.clk_div = 62;
+ break;
+ case FREQ_1MHz:
+ case FREQ_2MHz:
+ case FREQ_4MHz:
+ gen_cfg.clk_div = 8 * (1 << freq) - 1;
+ break;
+ }
+ } 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;
+ 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;

}
}
@@ -625,46 +767,60 @@ static int sync_serial_ioctl(struct inode *inode, struct file *file,
case MASTER_OUTPUT:
port->output = 1;
port->input = 0;
+ frm_cfg.out_on = regk_sser_tr;
+ frm_cfg.frame_pin_dir = regk_sser_out;
gen_cfg.clk_dir = regk_sser_out;
break;
case SLAVE_OUTPUT:
port->output = 1;
port->input = 0;
+ frm_cfg.frame_pin_dir = regk_sser_in;
gen_cfg.clk_dir = regk_sser_in;
break;
case MASTER_INPUT:
port->output = 0;
port->input = 1;
+ frm_cfg.frame_pin_dir = regk_sser_out;
+ frm_cfg.out_on = regk_sser_intern_tb;
gen_cfg.clk_dir = regk_sser_out;
break;
case SLAVE_INPUT:
port->output = 0;
port->input = 1;
+ frm_cfg.frame_pin_dir = regk_sser_in;
gen_cfg.clk_dir = regk_sser_in;
break;
case MASTER_BIDIR:
port->output = 1;
port->input = 1;
+ frm_cfg.frame_pin_dir = regk_sser_out;
+ frm_cfg.out_on = regk_sser_intern_tb;
gen_cfg.clk_dir = regk_sser_out;
break;
case SLAVE_BIDIR:
port->output = 1;
port->input = 1;
+ frm_cfg.frame_pin_dir = regk_sser_in;
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)
+ if (arg & NORMAL_SYNC) {
+ frm_cfg.rec_delay = 1;
frm_cfg.tr_delay = 1;
+ }
else if (arg & EARLY_SYNC)
- frm_cfg.tr_delay = 0;
+ frm_cfg.rec_delay = frm_cfg.tr_delay = 0;
+ else if (arg & SECOND_WORD_SYNC) {
+ frm_cfg.rec_delay = 7;
+ frm_cfg.tr_delay = 1;
+ }

tr_cfg.bulk_wspace = frm_cfg.tr_delay;
frm_cfg.early_wend = regk_sser_yes;
@@ -680,9 +836,11 @@ static int sync_serial_ioctl(struct inode *inode, struct file *file,
else if (arg & SYNC_OFF)
frm_cfg.frame_pin_use = regk_sser_gio0;

- if (arg & WORD_SIZE_8)
+ dma_w_size = regk_dma_set_w_size2;
+ if (arg & WORD_SIZE_8) {
rec_cfg.sample_size = tr_cfg.sample_size = 7;
- else if (arg & WORD_SIZE_12)
+ dma_w_size = regk_dma_set_w_size1;
+ } 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;
@@ -696,10 +854,13 @@ static int sync_serial_ioctl(struct inode *inode, struct file *file,
else if (arg & BIT_ORDER_LSB)
rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_lsbfirst;

- if (arg & FLOW_CONTROL_ENABLE)
+ if (arg & FLOW_CONTROL_ENABLE) {
+ frm_cfg.status_pin_use = regk_sser_frm;
rec_cfg.fifo_thr = regk_sser_thr16;
- else if (arg & FLOW_CONTROL_DISABLE)
+ } else if (arg & FLOW_CONTROL_DISABLE) {
+ frm_cfg.status_pin_use = regk_sser_gio0;
rec_cfg.fifo_thr = regk_sser_inf;
+ }

if (arg & CLOCK_NOT_GATED)
gen_cfg.gate_clk = regk_sser_no;
@@ -726,9 +887,9 @@ static int sync_serial_ioctl(struct inode *inode, struct file *file,
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;
+ else if (arg & CLOCK_INVERT)
+ gen_cfg.out_clk_pol = regk_sser_neg;

if (arg & FRAME_NORMAL)
frm_cfg.level = regk_sser_pos_hi;
@@ -770,10 +931,9 @@ static int sync_serial_ioctl(struct inode *inode, struct file *file,
}

- if (port->started)
- {
- tr_cfg.tr_en = port->output;
+ if (port->started) {
rec_cfg.rec_en = port->input;
+ gen_cfg.en = (port->output | port->input);
}

REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
@@ -782,138 +942,145 @@ static int sync_serial_ioctl(struct inode *inode, struct file *file,
REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg);

+
+ if (cmd == SSP_FRAME_SYNC && (arg & (WORD_SIZE_8 | WORD_SIZE_12 |
+ WORD_SIZE_16 | WORD_SIZE_24 | WORD_SIZE_32))) {
+ int en = gen_cfg.en;
+ gen_cfg.en = 0;
+ REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg);
+ /* ##### Should DMA be stoped before we change dma size? */
+ DMA_WR_CMD(port->regi_dmain, dma_w_size);
+ DMA_WR_CMD(port->regi_dmaout, dma_w_size);
+ gen_cfg.en = en;
+ 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)
+/* NOTE: sync_serial_write does not support concurrency */
+static ssize_t sync_serial_write(struct file *file, const char *buf,
+ size_t count, loff_t *ppos)
{
int dev = iminor(file->f_path.dentry->d_inode);
DECLARE_WAITQUEUE(wait, current);
- sync_port *port;
- unsigned long c, c1;
- unsigned long free_outp;
- unsigned long outp;
- unsigned long out_buffer;
+ struct sync_port *port;
+ int trunc_count;
unsigned long flags;
+ int bytes_free;
+ int out_buf_count;

- if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
- {
+ unsigned char *rd_ptr; /* First allocated byte in the buffer */
+ unsigned char *wr_ptr; /* First free byte in the buffer */
+ unsigned char *buf_stop_ptr; /* Last byte + 1 */
+
+ if (dev < 0 || dev >= NBR_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
- *
+ /* |<- OUT_BUFFER_SIZE ->|
+ * |<- out_buf_count ->|
+ * |<- trunc_count ->| ...->|
+ * ______________________________________________________
+ * | free | data | free |
+ * |_________|___________________|________________________|
+ * ^ rd_ptr ^ wr_ptr
*/
+ DEBUGWRITE(printk(KERN_DEBUG "W d%d c %lu a: %p c: %p\n",
+ port->port_nbr, count, port->active_tr_descr,
+ port->catch_tr_descr));

/* 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;
+ rd_ptr = port->out_rd_ptr;
+ out_buf_count = port->out_buf_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;
+ /* Check if resources are available */
+ if (port->tr_running &&
+ ((port->use_dma && port->active_tr_descr == port->catch_tr_descr) ||
+ out_buf_count >= OUT_BUFFER_SIZE)) {
+ DEBUGWRITE(printk(KERN_DEBUG "sser%d full\n", dev));
+ return -EAGAIN;
+ }
+
+ buf_stop_ptr = port->out_buffer + OUT_BUFFER_SIZE;
+
+ /* Determine pointer to the first free byte, before copying. */
+ wr_ptr = rd_ptr + out_buf_count;
+ if (wr_ptr >= buf_stop_ptr)
+ wr_ptr -= OUT_BUFFER_SIZE;
+
+ /* If we wrap the ring buffer, let the user space program handle it by
+ * truncating the data. This could be more elegant, small buffer
+ * fragments may occur.
+ */
+ bytes_free = OUT_BUFFER_SIZE - out_buf_count;
+ if (wr_ptr + bytes_free > buf_stop_ptr)
+ bytes_free = buf_stop_ptr - wr_ptr;
+ trunc_count = (count < bytes_free) ? count : bytes_free;

-// DEBUGWRITE(printk("w op %08lX fop %08lX c %lu\n", outp, free_outp, c));
- if (copy_from_user((void*)free_outp, buf, c))
+ if (copy_from_user(wr_ptr, buf, trunc_count))
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);
+ DEBUGOUTBUF(printk(KERN_DEBUG "%-4d + %-4d = %-4d %p %p %p\n",
+ out_buf_count, trunc_count,
+ port->out_buf_count, port->out_buffer,
+ wr_ptr, buf_stop_ptr));

/* Make sure transmitter/receiver is running */
- if (!port->started)
- {
+ 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;
+ /* Setup wait if blocking */
+ if (!(file->f_flags & O_NONBLOCK)) {
+ add_wait_queue(&port->out_wait_q, &wait);
+ set_current_state(TASK_INTERRUPTIBLE);
}

- /* 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);
- }
+ port->out_buf_count += trunc_count;
+ if (port->use_dma) {
+ start_dma_out(port, wr_ptr, trunc_count);
+ } else if (!port->tr_running) {
+ 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);
}
spin_unlock_irqrestore(&port->lock, flags);
+
+ /* Exit if non blocking */
+ if (file->f_flags & O_NONBLOCK) {
+ DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu %08x\n",
+ port->port_nbr, trunc_count,
+ REG_RD_INT(dma, port->regi_dmaout, r_intr)));
+ return trunc_count;
+ }
+
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;
+ DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu\n",
+ port->port_nbr, trunc_count));
+ return trunc_count;
}

static ssize_t sync_serial_read(struct file * file, char * buf,
@@ -926,7 +1093,7 @@ static ssize_t sync_serial_read(struct file * file, char * buf,
unsigned char* end;
unsigned long flags;

- if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
+ if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
{
DEBUG(printk("Invalid minor %d\n", dev));
return -ENODEV;
@@ -949,7 +1116,6 @@ static ssize_t sync_serial_read(struct file * file, char * buf,
port->started = 1;
}

-
/* Calculate number of available bytes */
/* Save pointers to avoid that they are modified by interrupt */
spin_lock_irqsave(&port->lock, flags);
@@ -958,16 +1124,14 @@ static ssize_t sync_serial_read(struct file * file, char * buf,
spin_unlock_irqrestore(&port->lock, flags);
while ((start == end) && !port->full) /* No data */
{
+ DEBUGREAD(printk(KERN_DEBUG "&"));
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 */
@@ -1004,83 +1168,105 @@ static void send_word(sync_port* port)
switch(tr_cfg.sample_size)
{
case 8:
- port->out_count--;
- tr_data.data = *port->outp++;
+ port->out_buf_count--;
+ tr_data.data = *port->out_rd_ptr++;
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;
+ if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
+ port->out_rd_ptr = port->out_buffer;
break;
case 12:
{
- int data = (*port->outp++) << 8;
- data |= *port->outp++;
- port->out_count-=2;
+ int data = (*port->out_rd_ptr++) << 8;
+ data |= *port->out_rd_ptr++;
+ port->out_buf_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;
+ if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
+ port->out_rd_ptr = port->out_buffer;
}
break;
case 16:
- port->out_count-=2;
- tr_data.data = *(unsigned short *)port->outp;
+ port->out_buf_count -= 2;
+ tr_data.data = *(unsigned short *)port->out_rd_ptr;
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;
+ port->out_rd_ptr += 2;
+ if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
+ port->out_rd_ptr = port->out_buffer;
break;
case 24:
- port->out_count-=3;
- tr_data.data = *(unsigned short *)port->outp;
+ port->out_buf_count -= 3;
+ tr_data.data = *(unsigned short *)port->out_rd_ptr;
REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
- port->outp+=2;
- tr_data.data = *port->outp++;
+ port->out_rd_ptr += 2;
+ tr_data.data = *port->out_rd_ptr++;
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;
+ if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
+ port->out_rd_ptr = port->out_buffer;
break;
case 32:
- port->out_count-=4;
- tr_data.data = *(unsigned short *)port->outp;
+ port->out_buf_count -= 4;
+ tr_data.data = *(unsigned short *)port->out_rd_ptr;
REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
- port->outp+=2;
- tr_data.data = *(unsigned short *)port->outp;
+ port->out_rd_ptr += 2;
+ tr_data.data = *(unsigned short *)port->out_rd_ptr;
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;
+ port->out_rd_ptr += 2;
+ if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
+ port->out_rd_ptr = port->out_buffer;
break;
}
}

-
-static void start_dma(struct sync_port* port, const char* data, int count)
+static void start_dma_out(struct sync_port *port,
+ const char *data, int count)
{
- port->tr_running = 1;
- port->out_descr.buf = (char*)virt_to_phys((char*)data);
- port->out_descr.after = port->out_descr.buf + count;
- port->out_descr.eol = port->out_descr.intr = 1;
+ port->active_tr_descr->buf = (char *) virt_to_phys((char *) data);
+ port->active_tr_descr->after = port->active_tr_descr->buf + count;
+ port->active_tr_descr->intr = 1;
+
+ port->active_tr_descr->eol = 1;
+ port->prev_tr_descr->eol = 0;
+
+ DEBUGTRDMA(printk(KERN_DEBUG "Inserting eolr:%p eol@:%p\n",
+ port->prev_tr_descr, port->active_tr_descr));
+ port->prev_tr_descr = port->active_tr_descr;
+ port->active_tr_descr = phys_to_virt((int) port->active_tr_descr->next);
+
+ if (!port->tr_running) {
+ reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser,
+ rw_tr_cfg);

- port->out_context.saved_data = (dma_descr_data*)virt_to_phys(&port->out_descr);
- port->out_context.saved_data_buf = port->out_descr.buf;
+ port->out_context.next = 0;
+ port->out_context.saved_data =
+ (dma_descr_data *)virt_to_phys(port->prev_tr_descr);
+ port->out_context.saved_data_buf = port->prev_tr_descr->buf;
+
+ DMA_START_CONTEXT(port->regi_dmaout,
+ virt_to_phys((char *)&port->out_context));
+
+ tr_cfg.tr_en = regk_sser_yes;
+ REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
+ DEBUGTRDMA(printk(KERN_DEBUG "dma s\n"););
+ } else {
+ DMA_CONTINUE_DATA(port->regi_dmaout);
+ DEBUGTRDMA(printk(KERN_DEBUG "dma c\n"););
+ }

- DMA_START_CONTEXT(port->regi_dmaout, virt_to_phys((char*)&port->out_context));
- DEBUGTXINT(printk("dma %08lX c %d\n", (unsigned long)data, count));
+ port->tr_running = 1;
}

-static void start_dma_in(sync_port* port)
+static void start_dma_in(sync_port *port)
{
int i;
- char* buf;
+ char *buf;
port->writep = port->flip;

- if (port->writep > port->flip + port->in_buffer_size)
- {
+ if (port->writep > port->flip + port->in_buffer_size) {
panic("Offset too large in sync serial driver\n");
return;
}
buf = (char*)virt_to_phys(port->in_buffer);
- for (i = 0; i < NUM_IN_DESCR; i++) {
+ for (i = 0; i < NBR_IN_DESCR; i++) {
port->in_descr[i].buf = buf;
port->in_descr[i].after = buf + port->inbufchunk;
port->in_descr[i].intr = 1;
@@ -1092,59 +1278,126 @@ static void start_dma_in(sync_port* port)
port->in_descr[i-1].next = (dma_descr_data*)virt_to_phys(&port->in_descr[0]);
port->in_descr[i-1].eol = regk_sser_yes;
port->next_rx_desc = &port->in_descr[0];
- port->prev_rx_desc = &port->in_descr[NUM_IN_DESCR - 1];
+ port->prev_rx_desc = &port->in_descr[NBR_IN_DESCR - 1];
port->in_context.saved_data = (dma_descr_data*)virt_to_phys(&port->in_descr[0]);
port->in_context.saved_data_buf = port->in_descr[0].buf;
DMA_START_CONTEXT(port->regi_dmain, virt_to_phys(&port->in_context));
}

#ifdef SYNC_SER_DMA
-static irqreturn_t tr_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+static irqreturn_t tr_interrupt(int irq, void *dev_id)
{
reg_dma_r_masked_intr masked;
reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes};
+ reg_dma_rw_stat stat;
int i;
- struct dma_descr_data *descr;
- unsigned int sentl;
int found = 0;
+ int stop_sser = 0;

- for (i = 0; i < NUMBER_OF_PORTS; i++)
- {
+ for (i = 0; i < NBR_PORTS; i++) {
sync_port *port = &ports[i];
- if (!port->enabled || !port->use_dma )
+ if (!port->enabled || !port->use_dma)
continue;

+ /* IRQ active for the port? */
masked = REG_RD(dma, port->regi_dmaout, r_masked_intr);
+ if (!masked.data)
+ continue;

- if (masked.data) /* IRQ active for the port? */
- {
- found = 1;
- /* Clear IRQ */
- REG_WR(dma, port->regi_dmaout, rw_ack_intr, ack_intr);
- descr = &port->out_descr;
- sentl = descr->after - descr->buf;
- port->out_count -= sentl;
- port->outp += sentl;
- if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
- port->outp = port->out_buffer;
- if (port->out_count) {
- int c;
- c = port->out_buffer + OUT_BUFFER_SIZE - port->outp;
- if (c > port->out_count)
- c = port->out_count;
- DEBUGTXINT(printk("tx_int DMAWRITE %i %i\n", sentl, c));
- start_dma(port, port->outp, c);
- } else {
- DEBUGTXINT(printk("tx_int DMA stop %i\n", sentl));
- port->tr_running = 0;
+ found = 1;
+
+ /* Check if we should stop the DMA transfer */
+ stat = REG_RD(dma, port->regi_dmaout, rw_stat);
+ if (stat.list_state == regk_dma_data_at_eol)
+ stop_sser = 1;
+
+ /* Clear IRQ */
+ REG_WR(dma, port->regi_dmaout, rw_ack_intr, ack_intr);
+
+ if (!stop_sser) {
+ /* The DMA has completed a descriptor, EOL was not
+ * encountered, so step relevant descriptor and
+ * datapointers forward. */
+ int sent;
+ sent = port->catch_tr_descr->after -
+ port->catch_tr_descr->buf;
+ DEBUGTXINT(printk(KERN_DEBUG "%-4d - %-4d = %-4d\t"
+ "in descr %p (ac: %p)\n",
+ port->out_buf_count, sent,
+ port->out_buf_count - sent,
+ port->catch_tr_descr,
+ port->active_tr_descr););
+ port->out_buf_count -= sent;
+ port->catch_tr_descr =
+ phys_to_virt((int) port->catch_tr_descr->next);
+ port->out_rd_ptr =
+ phys_to_virt((int) port->catch_tr_descr->buf);
+ } else {
+ int i, sent;
+ /* EOL handler.
+ * Note that if an EOL was encountered during the irq
+ * locked section of sync_ser_write the DMA will be
+ * restarted and the eol flag will be cleared.
+ * The remaining descriptors will be traversed by
+ * the descriptor interrupts as usual.
+ */
+ i = 0;
+ while (!port->catch_tr_descr->eol) {
+ sent = port->catch_tr_descr->after -
+ port->catch_tr_descr->buf;
+ DEBUGOUTBUF(printk(KERN_DEBUG
+ "traversing descr %p -%d (%d)\n",
+ port->catch_tr_descr,
+ sent,
+ port->out_buf_count));
+ port->out_buf_count -= sent;
+ port->catch_tr_descr = phys_to_virt(
+ (int)port->catch_tr_descr->next);
+ i++;
+ if (i >= NBR_OUT_DESCR) {
+ /* TODO: Reset and recover */
+ panic("sync_serial: missing eol");
+ }
}
- wake_up_interruptible(&port->out_wait_q); /* wake up the waiting process */
+ sent = port->catch_tr_descr->after -
+ port->catch_tr_descr->buf;
+ DEBUGOUTBUF(printk(KERN_DEBUG
+ "eol at descr %p -%d (%d)\n",
+ port->catch_tr_descr,
+ sent,
+ port->out_buf_count));
+
+ port->out_buf_count -= sent;
+
+ /* Update read pointer to first free byte, we
+ * may already be writing data there. */
+ port->out_rd_ptr =
+ phys_to_virt((int) port->catch_tr_descr->after);
+ if (port->out_rd_ptr > port->out_buffer +
+ OUT_BUFFER_SIZE)
+ port->out_rd_ptr = port->out_buffer;
+
+ reg_sser_rw_tr_cfg tr_cfg =
+ REG_RD(sser, port->regi_sser, rw_tr_cfg);
+ DEBUGTXINT(printk(KERN_DEBUG
+ "tr_int DMA stop %d, set catch @ %p\n",
+ port->out_buf_count,
+ port->active_tr_descr));
+ if (port->out_buf_count != 0)
+ printk(KERN_CRIT "sync_ser: buffer not "
+ "empty after eol.\n");
+ port->catch_tr_descr = port->active_tr_descr;
+ port->tr_running = 0;
+ tr_cfg.tr_en = regk_sser_no;
+ REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
}
+ /* wake up the waiting process */
+ wake_up_interruptible(&port->out_wait_q);
}
return IRQ_RETVAL(found);
} /* tr_interrupt */

-static irqreturn_t rx_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+static irqreturn_t rx_interrupt(int irq, void *dev_id)
{
reg_dma_r_masked_intr masked;
reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes};
@@ -1152,7 +1405,7 @@ static irqreturn_t rx_interrupt(int irq, void *dev_id, struct pt_regs * regs)
int i;
int found = 0;

- for (i = 0; i < NUMBER_OF_PORTS; i++)
+ for (i = 0; i < NBR_PORTS; i++)
{
sync_port *port = &ports[i];

@@ -1166,7 +1419,7 @@ static irqreturn_t rx_interrupt(int irq, void *dev_id, struct pt_regs * regs)
found = 1;
while (REG_RD(dma, port->regi_dmain, rw_data) !=
virt_to_phys(port->next_rx_desc)) {
-
+ DEBUGRXINT(printk(KERN_DEBUG "!"));
if (port->writep + port->inbufchunk > port->flip + port->in_buffer_size) {
int first_size = port->flip + port->in_buffer_size - port->writep;
memcpy((char*)port->writep, phys_to_virt((unsigned)port->next_rx_desc->buf), first_size);
@@ -1185,11 +1438,16 @@ static irqreturn_t rx_interrupt(int irq, void *dev_id, struct pt_regs * regs)
port->full = 1;
}

- port->next_rx_desc->eol = 0;
- port->prev_rx_desc->eol = 1;
- port->prev_rx_desc = phys_to_virt((unsigned)port->next_rx_desc);
+ port->next_rx_desc->eol = 1;
+ port->prev_rx_desc->eol = 0;
+ /* Cache bug workaround */
+ flush_dma_descr(port->prev_rx_desc, 0);
+ port->prev_rx_desc = port->next_rx_desc;
port->next_rx_desc = phys_to_virt((unsigned)port->next_rx_desc->next);
- wake_up_interruptible(&port->in_wait_q); /* wake up the waiting process */
+ /* Cache bug workaround */
+ flush_dma_descr(port->prev_rx_desc, 1);
+ /* wake up the waiting process */
+ wake_up_interruptible(&port->in_wait_q);
DMA_CONTINUE(port->regi_dmain);
REG_WR(dma, port->regi_dmain, rw_ack_intr, ack_intr);

@@ -1201,15 +1459,15 @@ static irqreturn_t rx_interrupt(int irq, void *dev_id, struct pt_regs * regs)
#endif /* SYNC_SER_DMA */

#ifdef SYNC_SER_MANUAL
-static irqreturn_t manual_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+static irqreturn_t manual_interrupt(int irq, void *dev_id)
{
int i;
int found = 0;
reg_sser_r_masked_intr masked;

- for (i = 0; i < NUMBER_OF_PORTS; i++)
+ for (i = 0; i < NBR_PORTS; i++)
{
- sync_port* port = &ports[i];
+ sync_port *port = &ports[i];

if (!port->enabled || port->use_dma)
{
@@ -1263,7 +1521,7 @@ static irqreturn_t manual_interrupt(int irq, void *dev_id, struct pt_regs * regs
if (masked.trdy) /* Transmitter ready? */
{
found = 1;
- if (port->out_count > 0) /* More data to send */
+ if (port->out_buf_count > 0) /* More data to send */
send_word(port);
else /* transmission finished */
{
--
1.5.3.6.970.gd25430