[SCSI] aic79xx: SLOWCRC fix

This patch introduces the SLOWCRC handling for certain buggy chipsets.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

4 files changed, 49 insertions, 3 deletions

diff --git a/drivers/scsi/aic7xxx/aic79xx.h b/drivers/scsi/aic7xxx/aic79xx.h
index 2cfdbef447db..1d11f7e77564 100644
--- a/drivers/scsi/aic7xxx/aic79xx.h
+++ b/drivers/scsi/aic7xxx/aic79xx.h
@@ -37,7 +37,7 @@
  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGES.
  *
- * $Id: //depot/aic7xxx/aic7xxx/aic79xx.h#108 $
+ * $Id: //depot/aic7xxx/aic7xxx/aic79xx.h#109 $
  *
  * $FreeBSD$
  */
@@ -222,6 +222,7 @@ typedef enum {
 typedef enum {
         AHD_FENONE              = 0x00000,
         AHD_WIDE                = 0x00001,/* Wide Channel */
+        AHD_AIC79XXB_SLOWCRC    = 0x00002,/* SLOWCRC bit should be set */
         AHD_MULTI_FUNC          = 0x00100,/* Multi-Function/Channel Device */
         AHD_TARGETMODE          = 0x01000,/* Has tested target mode support */
         AHD_MULTIROLE           = 0x02000,/* Space for two roles at a time */
diff --git a/drivers/scsi/aic7xxx/aic79xx_core.c b/drivers/scsi/aic7xxx/aic79xx_core.c
index dfd4cc93c05c..6114b3e72caa 100644
--- a/drivers/scsi/aic7xxx/aic79xx_core.c
+++ b/drivers/scsi/aic7xxx/aic79xx_core.c
@@ -3332,6 +3332,15 @@ ahd_update_neg_table(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
                 con_opts |= WIDEXFER;
 
         /*
+         * Slow down our CRC interval to be
+         * compatible with packetized U320 devices
+         * that can't handle a CRC at full speed
+         */
+        if (ahd->features & AHD_AIC79XXB_SLOWCRC) {
+                con_opts |= ENSLOWCRC;
+        }
+
+        /*
          * During packetized transfers, the target will
          * give us the oportunity to send command packets
          * without us asserting attention.
@@ -6740,6 +6749,18 @@ ahd_chip_init(struct ahd_softc *ahd)
 
         ahd_loadseq(ahd);
         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
+
+        if (ahd->features & AHD_AIC79XXB_SLOWCRC) {
+                u_int negodat3 = ahd_inb(ahd, NEGCONOPTS);
+
+                negodat3 |= ENSLOWCRC;
+                ahd_outb(ahd, NEGCONOPTS, negodat3);
+                negodat3 = ahd_inb(ahd, NEGCONOPTS);
+                if (!(negodat3 & ENSLOWCRC))
+                        printf("aic79xx: failed to set the SLOWCRC bit\n");
+                else
+                        printf("aic79xx: SLOWCRC bit set\n");
+        }
 }
 
 /*
diff --git a/drivers/scsi/aic7xxx/aic79xx_osm.c b/drivers/scsi/aic7xxx/aic79xx_osm.c
index 2567e29960bd..815c06312c88 100644
--- a/drivers/scsi/aic7xxx/aic79xx_osm.c
+++ b/drivers/scsi/aic7xxx/aic79xx_osm.c
@@ -314,6 +314,21 @@ static uint32_t aic79xx_seltime;
  */
 uint32_t aic79xx_periodic_otag;
 
+/* Some storage boxes are using an LSI chip which has a bug making it
+ * impossible to use aic79xx Rev B chip in 320 speeds.  The following
+ * storage boxes have been reported to be buggy:
+ * EonStor 3U 16-Bay: U16U-G3A3
+ * EonStor 2U 12-Bay: U12U-G3A3
+ * SentinelRAID: 2500F R5 / R6
+ * SentinelRAID: 2500F R1
+ * SentinelRAID: 2500F/1500F
+ * SentinelRAID: 150F
+ * 
+ * To get around this LSI bug, you can set your board to 160 mode
+ * or you can enable the SLOWCRC bit.
+ */
+uint32_t aic79xx_slowcrc;
+
 /*
  * Module information and settable options.
  */
@@ -343,6 +358,7 @@ MODULE_PARM_DESC(aic79xx,
 "       amplitude:<int>         Set the signal amplitude (0-7).\n"
 "       seltime:<int>           Selection Timeout:\n"
 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
+"       slowcrc                 Turn on the SLOWCRC bit (Rev B only)\n"          
 "\n"
 "       Sample /etc/modprobe.conf line:\n"
 "               Enable verbose logging\n"
@@ -1003,6 +1019,7 @@ aic79xx_setup(char *s)
                 { "slewrate", NULL },
                 { "precomp", NULL },
                 { "amplitude", NULL },
+                { "slowcrc", &aic79xx_slowcrc },
         };
 
         end = strchr(s, '\0');
diff --git a/drivers/scsi/aic7xxx/aic79xx_pci.c b/drivers/scsi/aic7xxx/aic79xx_pci.c
index 196a6344b037..757242e522c2 100644
--- a/drivers/scsi/aic7xxx/aic79xx_pci.c
+++ b/drivers/scsi/aic7xxx/aic79xx_pci.c
@@ -38,7 +38,7 @@
  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGES.
  *
- * $Id: //depot/aic7xxx/aic7xxx/aic79xx_pci.c#89 $
+ * $Id: //depot/aic7xxx/aic7xxx/aic79xx_pci.c#92 $
  */
 
 #ifdef __linux__
@@ -950,12 +950,19 @@ ahd_aic790X_setup(struct ahd_softc *ahd)
                 if ((ahd->flags & AHD_HP_BOARD) == 0)
                         AHD_SET_SLEWRATE(ahd, AHD_SLEWRATE_DEF_REVA);
         } else {
+                /* This is revision B and newer. */
+                extern uint32_t aic79xx_slowcrc;
                 u_int devconfig1;
 
                 ahd->features |= AHD_RTI|AHD_NEW_IOCELL_OPTS
-                              |  AHD_NEW_DFCNTRL_OPTS|AHD_FAST_CDB_DELIVERY;
+                              |  AHD_NEW_DFCNTRL_OPTS|AHD_FAST_CDB_DELIVERY
+                              |  AHD_BUSFREEREV_BUG;
                 ahd->bugs |= AHD_LQOOVERRUN_BUG|AHD_EARLY_REQ_BUG;
 
+                /* If the user requested the the SLOWCRC bit to be set. */
+                if (aic79xx_slowcrc)
+                        ahd->features |= AHD_AIC79XXB_SLOWCRC;
+
                 /*
                  * Some issues have been resolved in the 7901B.
                  */