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powerpc/powernv: Fix endian issue in opal_xscom_read 

opal_xscom_read uses a pointer to return the data so we need
to byteswap it on LE builds.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2013-12-13 15:53:43 +11:00 committed by Benjamin Herrenschmidt
parent a29e30efa3
commit 01a9dbccbd
2 changed files with 4 additions and 2 deletions
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2
arch/powerpc/include/asm/opal.h
View File

@ -720,7 +720,7 @@ int64_t opal_pci_next_error(uint64_t phb_id, uint64_t *first_frozen_pe,
int64_t opal_pci_poll(uint64_t phb_id);
int64_t opal_return_cpu(void);
int64_t opal_xscom_read(uint32_t gcid, uint32_t pcb_addr, uint64_t *val);
int64_t opal_xscom_read(uint32_t gcid, uint32_t pcb_addr, __be64 *val);
int64_t opal_xscom_write(uint32_t gcid, uint32_t pcb_addr, uint64_t val);
int64_t opal_lpc_write(uint32_t chip_id, enum OpalLPCAddressType addr_type,

4
arch/powerpc/platforms/powernv/opal-xscom.c
View File

@ -96,9 +96,11 @@ static int opal_scom_read(scom_map_t map, u64 reg, u64 *value)
{
struct opal_scom_map *m = map;
int64_t rc;
__be64 v;
reg = opal_scom_unmangle(reg);
rc = opal_xscom_read(m->chip, m->addr + reg, (uint64_t *)__pa(value));
rc = opal_xscom_read(m->chip, m->addr + reg, (__be64 *)__pa(&v));
*value = be64_to_cpu(v);
return opal_xscom_err_xlate(rc);
}