[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>

diff --git a/drivers/char/synclink_gt.c b/drivers/char/synclink_gt.c
index 2f07b08..bd38216 100644 (file)
--- 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);
 

diff --git a/include/linux/synclink.h b/include/linux/synclink.h
index 0577f52..c8b0426 100644 (file)
--- a/include/linux/synclink.h
+++ b/include/linux/synclink.h
@@ -1,7 +1,7 @@
 /*
  * SyncLink Multiprotocol Serial Adapter Driver
  *
- * $Id: synclink.h,v 3.13 2006/05/23 18:25:06 paulkf Exp $
+ * $Id: synclink.h,v 3.14 2006/07/17 20:15:43 paulkf Exp $
  *
  * Copyright (C) 1998-2000 by Microgate Corporation
  *
@@ -124,6 +124,8 @@
 
 #define MGSL_MODE_ASYNC                1
 #define MGSL_MODE_HDLC         2
+#define MGSL_MODE_MONOSYNC     3
+#define MGSL_MODE_BISYNC       4
 #define MGSL_MODE_RAW          6
 
 #define MGSL_BUS_TYPE_ISA      1