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author | David Daney <david.daney@cavium.com> | 2015-03-05 17:31:30 +0300 |
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committer | Ralf Baechle <ralf@linux-mips.org> | 2015-04-01 17:21:43 +0200 |
commit | 8c1e6b14e27d78fcea4aa6ba09e56c41f528f1cc (patch) | |
tree | ce651a479d315214e1270a026628689486cae762 /arch | |
parent | 24d4e7f642882a8a13da170b4ba86eec8fa91bf2 (diff) | |
download | op-kernel-dev-8c1e6b14e27d78fcea4aa6ba09e56c41f528f1cc.zip op-kernel-dev-8c1e6b14e27d78fcea4aa6ba09e56c41f528f1cc.tar.gz |
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')
-rw-r--r-- | arch/mips/Kconfig | 1 | ||||
-rw-r--r-- | arch/mips/cavium-octeon/flash_setup.c | 42 |
2 files changed, 42 insertions, 1 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index f4cebfc..f3d7ce5 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -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 diff --git a/arch/mips/cavium-octeon/flash_setup.c b/arch/mips/cavium-octeon/flash_setup.c index 237e5b1..39e26df 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; |