[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>
diff --git a/drivers/scsi/53c700.h b/drivers/scsi/53c700.h
index 362d784..a8c83bb 100644
--- a/drivers/scsi/53c700.h
+++ b/drivers/scsi/53c700.h
@@ -238,21 +238,23 @@
#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 @@
{
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 @@
BUG();
#endif
- iowrite32(bS_to_io(value), hostdata->base + reg);
+ bEBus ? iowrite32be(value, hostdata->base + reg):
+ iowrite32(value, hostdata->base + reg);
}
#endif