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MIPS: OCTEON: Protect accesses to bootbus flash with octeon_bootbus_sem.

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Without this, we get bus errors.

Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@auriga.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9460/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney 2015-03-05 17:31:30 +03:00 committed by Ralf Baechle
parent 24d4e7f642
commit 8c1e6b14e2
2 changed files with 42 additions and 1 deletions
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1
arch/mips/Kconfig
View File

@ -832,6 +832,7 @@ config CAVIUM_OCTEON_SOC
select SYS_SUPPORTS_SMP
select NR_CPUS_DEFAULT_16
select BUILTIN_DTB
select MTD_COMPLEX_MAPPINGS
help
This option supports all of the Octeon reference boards from Cavium
Networks. It builds a kernel that dynamically determines the Octeon

42
arch/mips/cavium-octeon/flash_setup.c
View File

@ -9,6 +9,7 @@
*/
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/semaphore.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
@ -25,6 +26,41 @@ static const char *part_probe_types[] = {
NULL
};
static map_word octeon_flash_map_read(struct map_info *map, unsigned long ofs)
{
map_word r;
down(&octeon_bootbus_sem);
r = inline_map_read(map, ofs);
up(&octeon_bootbus_sem);
return r;
}
static void octeon_flash_map_write(struct map_info *map, const map_word datum,
unsigned long ofs)
{
down(&octeon_bootbus_sem);
inline_map_write(map, datum, ofs);
up(&octeon_bootbus_sem);
}
static void octeon_flash_map_copy_from(struct map_info *map, void *to,
unsigned long from, ssize_t len)
{
down(&octeon_bootbus_sem);
inline_map_copy_from(map, to, from, len);
up(&octeon_bootbus_sem);
}
static void octeon_flash_map_copy_to(struct map_info *map, unsigned long to,
const void *from, ssize_t len)
{
down(&octeon_bootbus_sem);
inline_map_copy_to(map, to, from, len);
up(&octeon_bootbus_sem);
}
/**
* Module/ driver initialization.
*
@ -56,7 +92,11 @@ static int __init flash_init(void)
flash_map.virt = ioremap(flash_map.phys, flash_map.size);
pr_notice("Bootbus flash: Setting flash for %luMB flash at "
"0x%08llx\n", flash_map.size >> 20, flash_map.phys);
simple_map_init(&flash_map);
WARN_ON(!map_bankwidth_supported(flash_map.bankwidth));
flash_map.read = octeon_flash_map_read;
flash_map.write = octeon_flash_map_write;
flash_map.copy_from = octeon_flash_map_copy_from;
flash_map.copy_to = octeon_flash_map_copy_to;
mymtd = do_map_probe("cfi_probe", &flash_map);
if (mymtd) {
mymtd->owner = THIS_MODULE;