[PATCH] synclink_gt: add bisync and monosync modes

Add bisync and monosync serial protocol support to the synclink_gt driver.

Signed-off-by: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 63 insertions, 25 deletions

diff --git a/drivers/char/synclink_gt.c b/drivers/char/synclink_gt.c
index 2f07b085536b..bd3821679ac8 100644
--- a/drivers/char/synclink_gt.c
+++ b/drivers/char/synclink_gt.c
@@ -461,7 +461,7 @@ static int  adapter_test(struct slgt_info *info);
 static void reset_adapter(struct slgt_info *info);
 static void reset_port(struct slgt_info *info);
 static void async_mode(struct slgt_info *info);
-static void hdlc_mode(struct slgt_info *info);
+static void sync_mode(struct slgt_info *info);
 
 static void rx_stop(struct slgt_info *info);
 static void rx_start(struct slgt_info *info);
@@ -881,7 +881,9 @@ static int write(struct tty_struct *tty,
         if (!count)
                 goto cleanup;
 
-        if (info->params.mode == MGSL_MODE_RAW) {
+        if (info->params.mode == MGSL_MODE_RAW ||
+            info->params.mode == MGSL_MODE_MONOSYNC ||
+            info->params.mode == MGSL_MODE_BISYNC) {
                 unsigned int bufs_needed = (count/DMABUFSIZE);
                 unsigned int bufs_free = free_tbuf_count(info);
                 if (count % DMABUFSIZE)
@@ -1897,6 +1899,8 @@ static void bh_handler(void* context)
                                 while(rx_get_frame(info));
                                 break;
                         case MGSL_MODE_RAW:
+                        case MGSL_MODE_MONOSYNC:
+                        case MGSL_MODE_BISYNC:
                                 while(rx_get_buf(info));
                                 break;
                         }
@@ -2362,10 +2366,9 @@ static void program_hw(struct slgt_info *info)
         rx_stop(info);
         tx_stop(info);
 
-        if (info->params.mode == MGSL_MODE_HDLC ||
-            info->params.mode == MGSL_MODE_RAW ||
+        if (info->params.mode != MGSL_MODE_ASYNC ||
             info->netcount)
-                hdlc_mode(info);
+                sync_mode(info);
         else
                 async_mode(info);
 
@@ -2564,6 +2567,10 @@ static int rx_enable(struct slgt_info *info, int enable)
         if (enable) {
                 if (!info->rx_enabled)
                         rx_start(info);
+                else if (enable == 2) {
+                        /* force hunt mode (write 1 to RCR[3]) */
+                        wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
+                }
         } else {
                 if (info->rx_enabled)
                         rx_stop(info);
@@ -3748,7 +3755,7 @@ static void tx_start(struct slgt_info *info)
 {
         if (!info->tx_enabled) {
                 wr_reg16(info, TCR,
-                        (unsigned short)(rd_reg16(info, TCR) | BIT1));
+                         (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
                 info->tx_enabled = TRUE;
         }
 
@@ -3775,13 +3782,18 @@ static void tx_start(struct slgt_info *info)
                                 tdma_reset(info);
                                 /* set 1st descriptor address */
                                 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
-                                if (info->params.mode == MGSL_MODE_RAW)
+                                switch(info->params.mode) {
+                                case MGSL_MODE_RAW:
+                                case MGSL_MODE_MONOSYNC:
+                                case MGSL_MODE_BISYNC:
                                         wr_reg32(info, TDCSR, BIT2 + BIT0); /* IRQ + DMA enable */
-                                else
+                                        break;
+                                default:
                                         wr_reg32(info, TDCSR, BIT0); /* DMA enable */
+                                }
                         }
 
-                        if (info->params.mode != MGSL_MODE_RAW) {
+                        if (info->params.mode == MGSL_MODE_HDLC) {
                                 info->tx_timer.expires = jiffies + msecs_to_jiffies(5000);
                                 add_timer(&info->tx_timer);
                         }
@@ -3814,7 +3826,6 @@ static void tx_stop(struct slgt_info *info)
         /* reset and disable transmitter */
         val = rd_reg16(info, TCR) & ~BIT1;          /* clear enable bit */
         wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
-        wr_reg16(info, TCR, val);                  /* clear reset */
 
         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
 
@@ -3982,7 +3993,7 @@ static void async_mode(struct slgt_info *info)
                 enable_loopback(info);
 }
 
-static void hdlc_mode(struct slgt_info *info)
+static void sync_mode(struct slgt_info *info)
 {
         unsigned short val;
 
@@ -3992,7 +4003,7 @@ static void hdlc_mode(struct slgt_info *info)
 
         /* TCR (tx control)
          *
-         * 15..13  mode, 000=HDLC 001=raw sync
+         * 15..13  mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
          * 12..10  encoding
          * 09      CRC enable
          * 08      CRC32
@@ -4006,8 +4017,11 @@ static void hdlc_mode(struct slgt_info *info)
          */
         val = 0;
 
-        if (info->params.mode == MGSL_MODE_RAW)
-                val |= BIT13;
+        switch(info->params.mode) {
+        case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
+        case MGSL_MODE_BISYNC:   val |= BIT15; break;
+        case MGSL_MODE_RAW:      val |= BIT13; break;
+        }
         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
                 val |= BIT7;
 
@@ -4058,7 +4072,7 @@ static void hdlc_mode(struct slgt_info *info)
 
         /* RCR (rx control)
          *
-         * 15..13  mode, 000=HDLC 001=raw sync
+         * 15..13  mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
          * 12..10  encoding
          * 09      CRC enable
          * 08      CRC32
@@ -4069,8 +4083,11 @@ static void hdlc_mode(struct slgt_info *info)
          */
         val = 0;
 
-        if (info->params.mode == MGSL_MODE_RAW)
-                val |= BIT13;
+        switch(info->params.mode) {
+        case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
+        case MGSL_MODE_BISYNC:   val |= BIT15; break;
+        case MGSL_MODE_RAW:      val |= BIT13; break;
+        }
 
         switch(info->params.encoding)
         {
@@ -4309,10 +4326,15 @@ static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last
         while(!done) {
                 /* reset current buffer for reuse */
                 info->rbufs[i].status = 0;
-                if (info->params.mode == MGSL_MODE_RAW)
+                switch(info->params.mode) {
+                case MGSL_MODE_RAW:
+                case MGSL_MODE_MONOSYNC:
+                case MGSL_MODE_BISYNC:
                         set_desc_count(info->rbufs[i], info->raw_rx_size);
-                else
+                        break;
+                default:
                         set_desc_count(info->rbufs[i], DMABUFSIZE);
+                }
 
                 if (i == last)
                         done = 1;
@@ -4477,13 +4499,24 @@ cleanup:
 static int rx_get_buf(struct slgt_info *info)
 {
         unsigned int i = info->rbuf_current;
+        unsigned int count;
 
         if (!desc_complete(info->rbufs[i]))
                 return 0;
-        DBGDATA(info, info->rbufs[i].buf, desc_count(info->rbufs[i]), "rx");
-        DBGINFO(("rx_get_buf size=%d\n", desc_count(info->rbufs[i])));
-        ldisc_receive_buf(info->tty, info->rbufs[i].buf,
-                          info->flag_buf, desc_count(info->rbufs[i]));
+        count = desc_count(info->rbufs[i]);
+        switch(info->params.mode) {
+        case MGSL_MODE_MONOSYNC:
+        case MGSL_MODE_BISYNC:
+                /* ignore residue in byte synchronous modes */
+                if (desc_residue(info->rbufs[i]))
+                        count--;
+                break;
+        }
+        DBGDATA(info, info->rbufs[i].buf, count, "rx");
+        DBGINFO(("rx_get_buf size=%d\n", count));
+        if (count)
+                ldisc_receive_buf(info->tty, info->rbufs[i].buf,
+                                  info->flag_buf, count);
         free_rbufs(info, i, i);
         return 1;
 }
@@ -4549,8 +4582,13 @@ static void tx_load(struct slgt_info *info, const char *buf, unsigned int size)
                 size -= count;
                 buf  += count;
 
-                if (!size && info->params.mode != MGSL_MODE_RAW)
-                        set_desc_eof(*d, 1); /* HDLC: set EOF of last desc */
+                /*
+                 * set EOF bit for last buffer of HDLC frame or
+                 * for every buffer in raw mode
+                 */
+                if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
+                    info->params.mode == MGSL_MODE_RAW)
+                        set_desc_eof(*d, 1);
                 else
                         set_desc_eof(*d, 0);