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[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>
This commit is contained in:
James Bottomley 2005-11-29 16:24:52 -06:00 committed by James Bottomley
parent ef72582e7a
commit 8f23d47558
1 changed files with 13 additions and 9 deletions
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22
drivers/scsi/53c700.h
View File

@ -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