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authorDavid Daney <david.daney@cavium.com>2015-03-05 17:31:30 +0300
committerRalf Baechle <ralf@linux-mips.org>2015-04-01 17:21:43 +0200
commit8c1e6b14e27d78fcea4aa6ba09e56c41f528f1cc (patch)
treece651a479d315214e1270a026628689486cae762 /arch/mips/cavium-octeon
parent24d4e7f642882a8a13da170b4ba86eec8fa91bf2 (diff)
MIPS: OCTEON: Protect accesses to bootbus flash with octeon_bootbus_sem.
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>
Diffstat (limited to 'arch/mips/cavium-octeon')
-rw-r--r--arch/mips/cavium-octeon/flash_setup.c42
1 files changed, 41 insertions, 1 deletions
diff --git a/arch/mips/cavium-octeon/flash_setup.c b/arch/mips/cavium-octeon/flash_setup.c
index 237e5b1a72d8..39e26dfe7d8d 100644
--- a/arch/mips/cavium-octeon/flash_setup.c
+++ b/arch/mips/cavium-octeon/flash_setup.c
@@ -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;