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[IA64-SGI] fix sn_pci_legacy_read/fix sn_pci_legacy_write

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This patch adds a #define for SN_SAL_IOIF_PCI_SAFE and makes that the
preferred method of implementing sn_pci_legacy_read() and
sn_pci_legacy_write().

This SAL call has been present in SGI proms since version 4.10.  If the
SN_SAL_IOIF_PCI_SAFE call fails, revert to the previous code for compatability
with older proms.

Signed-off-by: Mark Maule <maule@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Mark Maule 2005-09-23 12:31:53 -05:00 committed by Tony Luck
parent 12f44f46bc
commit 61b9cf7c6c
2 changed files with 47 additions and 1 deletions
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46
arch/ia64/sn/pci/pci_dma.c
View file

@ -326,6 +326,29 @@ int sn_pci_legacy_read(struct pci_bus *bus, u16 port, u32 *val, u8 size)
{
unsigned long addr;
int ret;
struct ia64_sal_retval isrv;
/*
* First, try the SN_SAL_IOIF_PCI_SAFE SAL call which can work
* around hw issues at the pci bus level. SGI proms older than
* 4.10 don't implment this.
*/
SAL_CALL(isrv, SN_SAL_IOIF_PCI_SAFE,
pci_domain_nr(bus), bus->number,
0, /* io */
0, /* read */
port, size, __pa(val));
if (isrv.status == 0)
return size;
/*
* If the above failed, retry using the SAL_PROBE call which should
* be present in all proms (but which cannot work round PCI chipset
* bugs). This code is retained for compatability with old
* pre-4.10 proms, and should be removed at some point in the future.
*/
if (!SN_PCIBUS_BUSSOFT(bus))
return -ENODEV;
@ -349,6 +372,29 @@ int sn_pci_legacy_write(struct pci_bus *bus, u16 port, u32 val, u8 size)
int ret = size;
unsigned long paddr;
unsigned long *addr;
struct ia64_sal_retval isrv;
/*
* First, try the SN_SAL_IOIF_PCI_SAFE SAL call which can work
* around hw issues at the pci bus level. SGI proms older than
* 4.10 don't implment this.
*/
SAL_CALL(isrv, SN_SAL_IOIF_PCI_SAFE,
pci_domain_nr(bus), bus->number,
0, /* io */
1, /* write */
port, size, __pa(&val));
if (isrv.status == 0)
return size;
/*
* If the above failed, retry using the SAL_PROBE call which should
* be present in all proms (but which cannot work round PCI chipset
* bugs). This code is retained for compatability with old
* pre-4.10 proms, and should be removed at some point in the future.
*/
if (!SN_PCIBUS_BUSSOFT(bus)) {
ret = -ENODEV;

2
include/asm-ia64/sn/sn_sal.h
View file

@ -67,7 +67,7 @@
#define SN_SAL_IOIF_INTERRUPT 0x0200004a
#define SN_SAL_HWPERF_OP 0x02000050 // lock
#define SN_SAL_IOIF_ERROR_INTERRUPT 0x02000051
#define SN_SAL_IOIF_PCI_SAFE 0x02000052
#define SN_SAL_IOIF_SLOT_ENABLE 0x02000053
#define SN_SAL_IOIF_SLOT_DISABLE 0x02000054
#define SN_SAL_IOIF_GET_HUBDEV_INFO 0x02000055