From 8c1e6b14e27d78fcea4aa6ba09e56c41f528f1cc Mon Sep 17 00:00:00 2001 From: David Daney Date: Thu, 5 Mar 2015 17:31:30 +0300 Subject: [PATCH] MIPS: OCTEON: Protect accesses to bootbus flash with octeon_bootbus_sem. Without this, we get bus errors. Signed-off-by: David Daney Signed-off-by: Aleksey Makarov 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 --- arch/mips/Kconfig | 1 + arch/mips/cavium-octeon/flash_setup.c | 42 ++++++++++++++++++++++++++- 2 files changed, 42 insertions(+), 1 deletion(-) diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index f4cebfc8c7f9..f3d7ce58dc70 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 237e5b1a72d8..39e26dfe7d8d 100644 --- a/arch/mips/cavium-octeon/flash_setup.c +++ b/arch/mips/cavium-octeon/flash_setup.c @@ -9,6 +9,7 @@ */ #include #include +#include #include #include #include @@ -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; -- 2.20.1