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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/mtd/maps/tsunami_flash.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/mtd/maps/tsunami_flash.c')
-rw-r--r-- | kernel/drivers/mtd/maps/tsunami_flash.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/kernel/drivers/mtd/maps/tsunami_flash.c b/kernel/drivers/mtd/maps/tsunami_flash.c new file mode 100644 index 000000000..da2cdb5fd --- /dev/null +++ b/kernel/drivers/mtd/maps/tsunami_flash.c @@ -0,0 +1,108 @@ +/* + * tsunami_flash.c + * + * flash chip on alpha ds10... + */ +#include <asm/io.h> +#include <asm/core_tsunami.h> +#include <linux/init.h> +#include <linux/mtd/map.h> +#include <linux/mtd/mtd.h> + +#define FLASH_ENABLE_PORT 0x00C00001 +#define FLASH_ENABLE_BYTE 0x01 +#define FLASH_DISABLE_BYTE 0x00 + +#define MAX_TIG_FLASH_SIZE (12*1024*1024) +static inline map_word tsunami_flash_read8(struct map_info *map, unsigned long offset) +{ + map_word val; + val.x[0] = tsunami_tig_readb(offset); + return val; +} + +static void tsunami_flash_write8(struct map_info *map, map_word value, unsigned long offset) +{ + tsunami_tig_writeb(value.x[0], offset); +} + +static void tsunami_flash_copy_from( + struct map_info *map, void *addr, unsigned long offset, ssize_t len) +{ + unsigned char *dest; + dest = addr; + while(len && (offset < MAX_TIG_FLASH_SIZE)) { + *dest = tsunami_tig_readb(offset); + offset++; + dest++; + len--; + } +} + +static void tsunami_flash_copy_to( + struct map_info *map, unsigned long offset, + const void *addr, ssize_t len) +{ + const unsigned char *src; + src = addr; + while(len && (offset < MAX_TIG_FLASH_SIZE)) { + tsunami_tig_writeb(*src, offset); + offset++; + src++; + len--; + } +} + +/* + * Deliberately don't provide operations wider than 8 bits. I don't + * have then and it scares me to think how you could mess up if + * you tried to use them. Buswidth is correctly so I'm safe. + */ +static struct map_info tsunami_flash_map = { + .name = "flash chip on the Tsunami TIG bus", + .size = MAX_TIG_FLASH_SIZE, + .phys = NO_XIP, + .bankwidth = 1, + .read = tsunami_flash_read8, + .copy_from = tsunami_flash_copy_from, + .write = tsunami_flash_write8, + .copy_to = tsunami_flash_copy_to, +}; + +static struct mtd_info *tsunami_flash_mtd; + +static void __exit cleanup_tsunami_flash(void) +{ + struct mtd_info *mtd; + mtd = tsunami_flash_mtd; + if (mtd) { + mtd_device_unregister(mtd); + map_destroy(mtd); + } + tsunami_flash_mtd = 0; +} + +static const char * const rom_probe_types[] = { + "cfi_probe", "jedec_probe", "map_rom", NULL }; + +static int __init init_tsunami_flash(void) +{ + const char * const *type; + + tsunami_tig_writeb(FLASH_ENABLE_BYTE, FLASH_ENABLE_PORT); + + tsunami_flash_mtd = 0; + type = rom_probe_types; + for(; !tsunami_flash_mtd && *type; type++) { + tsunami_flash_mtd = do_map_probe(*type, &tsunami_flash_map); + } + if (tsunami_flash_mtd) { + tsunami_flash_mtd->owner = THIS_MODULE; + mtd_device_register(tsunami_flash_mtd, NULL, 0); + return 0; + } + return -ENXIO; +} + +module_init(init_tsunami_flash); +module_exit(cleanup_tsunami_flash); |