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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/mtd/maps/tsunami_flash.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/mtd/maps/tsunami_flash.c')
-rw-r--r-- | drivers/mtd/maps/tsunami_flash.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/drivers/mtd/maps/tsunami_flash.c b/drivers/mtd/maps/tsunami_flash.c new file mode 100644 index 0000000000..9fc1f727aa --- /dev/null +++ b/drivers/mtd/maps/tsunami_flash.c @@ -0,0 +1,109 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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); |