[SCSI] Add spi_populate_*_msg functions

Introduce new helpers:
 - spi_populate_width_msg()
 - spi_populate_sync_msg()
 - spi_populate_ppr_msg()

and use them in drivers which already enable the SPI transport.

Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

7 files changed, 69 insertions, 115 deletions

diff --git a/drivers/scsi/53c700.c b/drivers/scsi/53c700.c
index 4ce7438608ec..6a0f9506ea00 100644
--- a/drivers/scsi/53c700.c
+++ b/drivers/scsi/53c700.c
@@ -238,14 +238,6 @@ static char *NCR_700_SBCL_to_phase[] = {
         "MSG IN",
 };
 
-static __u8 NCR_700_SDTR_msg[] = {
-        0x01,                   /* Extended message */
-        0x03,                   /* Extended message Length */
-        0x01,                   /* SDTR Extended message */
-        NCR_700_MIN_PERIOD,
-        NCR_700_MAX_OFFSET
-};
-
 /* This translates the SDTR message offset and period to a value
  * which can be loaded into the SXFER_REG.
  *
@@ -266,7 +258,7 @@ NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
                 return 0;
 
         if(period < hostdata->min_period) {
-                printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_SDTR_msg[3]*4);
+                printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
                 period = hostdata->min_period;
         }
         XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
@@ -1434,11 +1426,9 @@ NCR_700_start_command(struct scsi_cmnd *SCp)
 
         if(hostdata->fast &&
            NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
-                memcpy(&hostdata->msgout[count], NCR_700_SDTR_msg,
-                       sizeof(NCR_700_SDTR_msg));
-                hostdata->msgout[count+3] = spi_period(SCp->device->sdev_target);
-                hostdata->msgout[count+4] = spi_offset(SCp->device->sdev_target);
-                count += sizeof(NCR_700_SDTR_msg);
+                count += spi_populate_sync_msg(&hostdata->msgout[count],
+                                spi_period(SCp->device->sdev_target),
+                                spi_offset(SCp->device->sdev_target));
                 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
         }
 
diff --git a/drivers/scsi/aha152x.c b/drivers/scsi/aha152x.c
index cb2ee25f213f..67d78ed7119a 100644
--- a/drivers/scsi/aha152x.c
+++ b/drivers/scsi/aha152x.c
@@ -1708,12 +1708,7 @@ static void seldo_run(struct Scsi_Host *shpnt)
                 ADDMSGO(BUS_DEVICE_RESET);
         } else if (SYNCNEG==0 && SYNCHRONOUS) {
                 CURRENT_SC->SCp.phase |= syncneg;
-                ADDMSGO(EXTENDED_MESSAGE);
-                ADDMSGO(3);
-                ADDMSGO(EXTENDED_SDTR);
-                ADDMSGO(50);            /* 200ns */
-                ADDMSGO(8);             /* 8 byte req/ack offset */
-
+                MSGOLEN += spi_populate_sync_msg(&MSGO(MSGOLEN), 50, 8);
                 SYNCNEG=1;              /* negotiation in progress */
         }
 
diff --git a/drivers/scsi/aic7xxx/aic79xx_core.c b/drivers/scsi/aic7xxx/aic79xx_core.c
index 342f77966a5b..b6266fd31688 100644
--- a/drivers/scsi/aic7xxx/aic79xx_core.c
+++ b/drivers/scsi/aic7xxx/aic79xx_core.c
@@ -3762,11 +3762,8 @@ ahd_construct_sdtr(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
 {
         if (offset == 0)
                 period = AHD_ASYNC_XFER_PERIOD;
-        ahd->msgout_buf[ahd->msgout_index++] = MSG_EXTENDED;
-        ahd->msgout_buf[ahd->msgout_index++] = MSG_EXT_SDTR_LEN;
-        ahd->msgout_buf[ahd->msgout_index++] = MSG_EXT_SDTR;
-        ahd->msgout_buf[ahd->msgout_index++] = period;
-        ahd->msgout_buf[ahd->msgout_index++] = offset;
+        ahd->msgout_index += spi_populate_sync_msg(
+                        ahd->msgout_buf + ahd->msgout_index, period, offset);
         ahd->msgout_len += 5;
         if (bootverbose) {
                 printf("(%s:%c:%d:%d): Sending SDTR period %x, offset %x\n",
@@ -3783,10 +3780,8 @@ static void
 ahd_construct_wdtr(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
                    u_int bus_width)
 {
-        ahd->msgout_buf[ahd->msgout_index++] = MSG_EXTENDED;
-        ahd->msgout_buf[ahd->msgout_index++] = MSG_EXT_WDTR_LEN;
-        ahd->msgout_buf[ahd->msgout_index++] = MSG_EXT_WDTR;
-        ahd->msgout_buf[ahd->msgout_index++] = bus_width;
+        ahd->msgout_index += spi_populate_width_msg(
+                        ahd->msgout_buf + ahd->msgout_index, bus_width);
         ahd->msgout_len += 4;
         if (bootverbose) {
                 printf("(%s:%c:%d:%d): Sending WDTR %x\n",
@@ -3813,14 +3808,9 @@ ahd_construct_ppr(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
                 ppr_options |= MSG_EXT_PPR_PCOMP_EN;
         if (offset == 0)
                 period = AHD_ASYNC_XFER_PERIOD;
-        ahd->msgout_buf[ahd->msgout_index++] = MSG_EXTENDED;
-        ahd->msgout_buf[ahd->msgout_index++] = MSG_EXT_PPR_LEN;
-        ahd->msgout_buf[ahd->msgout_index++] = MSG_EXT_PPR;
-        ahd->msgout_buf[ahd->msgout_index++] = period;
-        ahd->msgout_buf[ahd->msgout_index++] = 0;
-        ahd->msgout_buf[ahd->msgout_index++] = offset;
-        ahd->msgout_buf[ahd->msgout_index++] = bus_width;
-        ahd->msgout_buf[ahd->msgout_index++] = ppr_options;
+        ahd->msgout_index += spi_populate_ppr_msg(
+                        ahd->msgout_buf + ahd->msgout_index, period, offset,
+                        bus_width, ppr_options);
         ahd->msgout_len += 8;
         if (bootverbose) {
                 printf("(%s:%c:%d:%d): Sending PPR bus_width %x, period %x, "
diff --git a/drivers/scsi/aic7xxx/aic7xxx_core.c b/drivers/scsi/aic7xxx/aic7xxx_core.c
index 58ac46103eb6..d37566978fba 100644
--- a/drivers/scsi/aic7xxx/aic7xxx_core.c
+++ b/drivers/scsi/aic7xxx/aic7xxx_core.c
@@ -2461,11 +2461,8 @@ ahc_construct_sdtr(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
 {
         if (offset == 0)
                 period = AHC_ASYNC_XFER_PERIOD;
-        ahc->msgout_buf[ahc->msgout_index++] = MSG_EXTENDED;
-        ahc->msgout_buf[ahc->msgout_index++] = MSG_EXT_SDTR_LEN;
-        ahc->msgout_buf[ahc->msgout_index++] = MSG_EXT_SDTR;
-        ahc->msgout_buf[ahc->msgout_index++] = period;
-        ahc->msgout_buf[ahc->msgout_index++] = offset;
+        ahc->msgout_index += spi_populate_sync_msg(
+                        ahc->msgout_buf + ahc->msgout_index, period, offset);
         ahc->msgout_len += 5;
         if (bootverbose) {
                 printf("(%s:%c:%d:%d): Sending SDTR period %x, offset %x\n",
@@ -2482,10 +2479,8 @@ static void
 ahc_construct_wdtr(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
                    u_int bus_width)
 {
-        ahc->msgout_buf[ahc->msgout_index++] = MSG_EXTENDED;
-        ahc->msgout_buf[ahc->msgout_index++] = MSG_EXT_WDTR_LEN;
-        ahc->msgout_buf[ahc->msgout_index++] = MSG_EXT_WDTR;
-        ahc->msgout_buf[ahc->msgout_index++] = bus_width;
+        ahc->msgout_index += spi_populate_width_msg(
+                        ahc->msgout_buf + ahc->msgout_index, bus_width);
         ahc->msgout_len += 4;
         if (bootverbose) {
                 printf("(%s:%c:%d:%d): Sending WDTR %x\n",
@@ -2505,14 +2500,9 @@ ahc_construct_ppr(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
 {
         if (offset == 0)
                 period = AHC_ASYNC_XFER_PERIOD;
-        ahc->msgout_buf[ahc->msgout_index++] = MSG_EXTENDED;
-        ahc->msgout_buf[ahc->msgout_index++] = MSG_EXT_PPR_LEN;
-        ahc->msgout_buf[ahc->msgout_index++] = MSG_EXT_PPR;
-        ahc->msgout_buf[ahc->msgout_index++] = period;
-        ahc->msgout_buf[ahc->msgout_index++] = 0;
-        ahc->msgout_buf[ahc->msgout_index++] = offset;
-        ahc->msgout_buf[ahc->msgout_index++] = bus_width;
-        ahc->msgout_buf[ahc->msgout_index++] = ppr_options;
+        ahc->msgout_index += spi_populate_ppr_msg(
+                        ahc->msgout_buf + ahc->msgout_index, period, offset,
+                        bus_width, ppr_options);
         ahc->msgout_len += 8;
         if (bootverbose) {
                 printf("(%s:%c:%d:%d): Sending PPR bus_width %x, period %x, "
diff --git a/drivers/scsi/ncr53c8xx.c b/drivers/scsi/ncr53c8xx.c
index abb1859bff09..22f913127f08 100644
--- a/drivers/scsi/ncr53c8xx.c
+++ b/drivers/scsi/ncr53c8xx.c
@@ -4105,17 +4105,11 @@ static int ncr_prepare_nego(struct ncb *np, struct ccb *cp, u_char *msgptr)
 
         switch (nego) {
         case NS_SYNC:
-                msgptr[msglen++] = EXTENDED_MESSAGE;
-                msgptr[msglen++] = 3;
-                msgptr[msglen++] = EXTENDED_SDTR;
-                msgptr[msglen++] = tp->maxoffs ? tp->minsync : 0;
-                msgptr[msglen++] = tp->maxoffs;
+                msglen += spi_populate_sync_msg(msgptr + msglen,
+                                tp->maxoffs ? tp->minsync : 0, tp->maxoffs);
                 break;
         case NS_WIDE:
-                msgptr[msglen++] = EXTENDED_MESSAGE;
-                msgptr[msglen++] = 2;
-                msgptr[msglen++] = EXTENDED_WDTR;
-                msgptr[msglen++] = tp->usrwide;
+                msglen += spi_populate_width_msg(msgptr + msglen, tp->usrwide);
                 break;
         }
 
@@ -6989,12 +6983,7 @@ void ncr_int_sir (struct ncb *np)
                 spi_offset(starget) = ofs;
                 ncr_setsync(np, cp, scntl3, (fak<<5)|ofs);
 
-                np->msgout[0] = EXTENDED_MESSAGE;
-                np->msgout[1] = 3;
-                np->msgout[2] = EXTENDED_SDTR;
-                np->msgout[3] = per;
-                np->msgout[4] = ofs;
-
+                spi_populate_sync_msg(np->msgout, per, ofs);
                 cp->nego_status = NS_SYNC;
 
                 if (DEBUG_FLAGS & DEBUG_NEGO) {
@@ -7080,11 +7069,7 @@ void ncr_int_sir (struct ncb *np)
 
                 spi_width(starget) = wide;
                 ncr_setwide(np, cp, wide, 1);
-
-                np->msgout[0] = EXTENDED_MESSAGE;
-                np->msgout[1] = 2;
-                np->msgout[2] = EXTENDED_WDTR;
-                np->msgout[3] = wide;
+                spi_populate_width_msg(np->msgout, wide);
 
                 np->msgin [0] = NOP;
 
diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c
index 97f4be62f748..c0051a432a97 100644
--- a/drivers/scsi/scsi_transport_spi.c
+++ b/drivers/scsi/scsi_transport_spi.c
@@ -1051,6 +1051,39 @@ void spi_display_xfer_agreement(struct scsi_target *starget)
 }
 EXPORT_SYMBOL(spi_display_xfer_agreement);
 
+int spi_populate_width_msg(unsigned char *msg, int width)
+{
+        msg[0] = EXTENDED_MESSAGE;
+        msg[1] = 2;
+        msg[2] = EXTENDED_WDTR;
+        msg[3] = width;
+        return 4;
+}
+
+int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
+{
+        msg[0] = EXTENDED_MESSAGE;
+        msg[1] = 3;
+        msg[2] = EXTENDED_SDTR;
+        msg[3] = period;
+        msg[4] = offset;
+        return 5;
+}
+
+int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
+                int width, int options)
+{
+        msg[0] = EXTENDED_MESSAGE;
+        msg[1] = 6;
+        msg[2] = EXTENDED_PPR;
+        msg[3] = period;
+        msg[4] = 0;
+        msg[5] = offset;
+        msg[6] = width;
+        msg[7] = options;
+        return 8;
+}
+
 #ifdef CONFIG_SCSI_CONSTANTS
 static const char * const one_byte_msgs[] = {
 /* 0x00 */ "Command Complete", NULL, "Save Pointers",
diff --git a/drivers/scsi/sym53c8xx_2/sym_hipd.c b/drivers/scsi/sym53c8xx_2/sym_hipd.c
index f4854c33f48d..620b4726fbd9 100644
--- a/drivers/scsi/sym53c8xx_2/sym_hipd.c
+++ b/drivers/scsi/sym53c8xx_2/sym_hipd.c
@@ -40,7 +40,6 @@
 
 #include <linux/slab.h>
 #include <asm/param.h>          /* for timeouts in units of HZ */
-#include <scsi/scsi_dbg.h>
 
 #include "sym_glue.h"
 #include "sym_nvram.h"
@@ -1430,29 +1429,18 @@ static int sym_prepare_nego(struct sym_hcb *np, struct sym_ccb *cp, u_char *msgp
 
         switch (nego) {
         case NS_SYNC:
-                msgptr[msglen++] = M_EXTENDED;
-                msgptr[msglen++] = 3;
-                msgptr[msglen++] = M_X_SYNC_REQ;
-                msgptr[msglen++] = goal->period;
-                msgptr[msglen++] = goal->offset;
+                msglen += spi_populate_sync_msg(msgptr + msglen, goal->period,
+                                goal->offset);
                 break;
         case NS_WIDE:
-                msgptr[msglen++] = M_EXTENDED;
-                msgptr[msglen++] = 2;
-                msgptr[msglen++] = M_X_WIDE_REQ;
-                msgptr[msglen++] = goal->width;
+                msglen += spi_populate_width_msg(msgptr + msglen, goal->width);
                 break;
         case NS_PPR:
-                msgptr[msglen++] = M_EXTENDED;
-                msgptr[msglen++] = 6;
-                msgptr[msglen++] = M_X_PPR_REQ;
-                msgptr[msglen++] = goal->period;
-                msgptr[msglen++] = 0;
-                msgptr[msglen++] = goal->offset;
-                msgptr[msglen++] = goal->width;
-                msgptr[msglen++] = (goal->iu ? PPR_OPT_IU : 0) |
+                msglen += spi_populate_ppr_msg(msgptr + msglen, goal->period,
+                                goal->offset, goal->width,
+                                (goal->iu ? PPR_OPT_IU : 0) |
                                         (goal->dt ? PPR_OPT_DT : 0) |
-                                        (goal->qas ? PPR_OPT_QAS : 0);
+                                        (goal->qas ? PPR_OPT_QAS : 0));
                 break;
         }
 
@@ -3948,11 +3936,7 @@ sym_sync_nego_check(struct sym_hcb *np, int req, struct sym_ccb *cp)
         /*
          *  It was a request. Prepare an answer message.
          */
-        np->msgout[0] = M_EXTENDED;
-        np->msgout[1] = 3;
-        np->msgout[2] = M_X_SYNC_REQ;
-        np->msgout[3] = per;
-        np->msgout[4] = ofs;
+        spi_populate_sync_msg(np->msgout, per, ofs);
 
         if (DEBUG_FLAGS & DEBUG_NEGO) {
                 sym_print_nego_msg(np, target, "sync msgout", np->msgout);
@@ -4078,14 +4062,7 @@ sym_ppr_nego_check(struct sym_hcb *np, int req, int target)
         /*
          *  It was a request. Prepare an answer message.
          */
-        np->msgout[0] = M_EXTENDED;
-        np->msgout[1] = 6;
-        np->msgout[2] = M_X_PPR_REQ;
-        np->msgout[3] = per;
-        np->msgout[4] = 0;
-        np->msgout[5] = ofs;
-        np->msgout[6] = wide;
-        np->msgout[7] = opts;
+        spi_populate_ppr_msg(np->msgout, per, ofs, wide, opts);
 
         if (DEBUG_FLAGS & DEBUG_NEGO) {
                 sym_print_nego_msg(np, target, "ppr msgout", np->msgout);
@@ -4197,10 +4174,7 @@ sym_wide_nego_check(struct sym_hcb *np, int req, struct sym_ccb *cp)
         /*
          *  It was a request. Prepare an answer message.
          */
-        np->msgout[0] = M_EXTENDED;
-        np->msgout[1] = 2;
-        np->msgout[2] = M_X_WIDE_REQ;
-        np->msgout[3] = wide;
+        spi_populate_width_msg(np->msgout, wide);
 
         np->msgin [0] = M_NOOP;
 
@@ -4245,11 +4219,8 @@ static void sym_wide_nego(struct sym_hcb *np, struct sym_tcb *tp, struct sym_ccb
                  * a single SCSI command (Suggested by Justin Gibbs).
                  */
                 if (tp->tgoal.offset) {
-                        np->msgout[0] = M_EXTENDED;
-                        np->msgout[1] = 3;
-                        np->msgout[2] = M_X_SYNC_REQ;
-                        np->msgout[3] = tp->tgoal.period;
-                        np->msgout[4] = tp->tgoal.offset;
+                        spi_populate_sync_msg(np->msgout, tp->tgoal.period,
+                                        tp->tgoal.offset);
 
                         if (DEBUG_FLAGS & DEBUG_NEGO) {
                                 sym_print_nego_msg(np, cp->target,