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authorJames Bottomley <James.Bottomley@steeleye.com>2005-11-29 23:24:52 +0100
committerJames Bottomley <jejb@mulgrave.(none)>2005-12-16 18:51:01 +0100
commit8f23d475581adac949315e3339421e12554932c9 (patch)
tree30e68e2f1f48b39e0dd0da382d1297d321f817f9 /drivers/scsi/53c700.h
parent[SCSI] Add PPR support to spi_print_msg (diff)
downloadlinux-8f23d475581adac949315e3339421e12554932c9.tar.xz
linux-8f23d475581adac949315e3339421e12554932c9.zip
[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>
Diffstat (limited to 'drivers/scsi/53c700.h')
-rw-r--r--drivers/scsi/53c700.h22
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