[SCSI] 53c700: update endian processing macros

This update now allows this driver to be used on big endian bus
machines that aren't parisc.  To do that, the driver must set a
CONFIG_53C700_BE_BUS in Kconfig to compile the right macro versions.

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

1 files changed, 13 insertions, 9 deletions

diff --git a/drivers/scsi/53c700.h b/drivers/scsi/53c700.h
index 362d78483d09..a8c83bb03630 100644
--- a/drivers/scsi/53c700.h
+++ b/drivers/scsi/53c700.h
@@ -238,21 +238,23 @@ struct NCR_700_Host_Parameters {
 #ifdef CONFIG_53C700_LE_ON_BE
 #define bE      (hostdata->force_le_on_be ? 0 : 3)
 #define bSWAP   (hostdata->force_le_on_be)
-/* This is terrible, but there's no raw version of ioread32.  That means
- * that on a be board we swap twice (once in ioread32 and once again to 
- * get the value correct) */
-#define bS_to_io(x)     ((hostdata->force_le_on_be) ? (x) : cpu_to_le32(x))
+#define bEBus   (!hostdata->force_le_on_be)
 #elif defined(__BIG_ENDIAN)
 #define bE      3
 #define bSWAP   0
-#define bS_to_io(x)     (x)
 #elif defined(__LITTLE_ENDIAN)
 #define bE      0
 #define bSWAP   0
-#define bS_to_io(x)     (x)
 #else
 #error "__BIG_ENDIAN or __LITTLE_ENDIAN must be defined, did you include byteorder.h?"
 #endif
+#ifndef bEBus
+#ifdef CONFIG_53C700_BE_BUS
+#define bEBus   1
+#else
+#define bEBus   0
+#endif
+#endif
 #define bS_to_cpu(x)    (bSWAP ? le32_to_cpu(x) : (x))
 #define bS_to_host(x)   (bSWAP ? cpu_to_le32(x) : (x))
 
@@ -466,14 +468,15 @@ NCR_700_readl(struct Scsi_Host *host, __u32 reg)
 {
         const struct NCR_700_Host_Parameters *hostdata
                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
-        __u32 value = ioread32(hostdata->base + reg);
+        __u32 value = bEBus ? ioread32be(hostdata->base + reg) :
+                ioread32(hostdata->base + reg);
 #if 1
         /* sanity check the register */
         if((reg & 0x3) != 0)
                 BUG();
 #endif
 
-        return bS_to_io(value);
+        return value;
 }
 
 static inline void
@@ -497,7 +500,8 @@ NCR_700_writel(__u32 value, struct Scsi_Host *host, __u32 reg)
                 BUG();
 #endif
 
-        iowrite32(bS_to_io(value), hostdata->base + reg);
+        bEBus ? iowrite32be(value, hostdata->base + reg): 
+                iowrite32(value, hostdata->base + reg);
 }
 
 #endif