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109 lines
2.5 KiB
109 lines
2.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* tsunami_flash.c |
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* |
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* flash chip on alpha ds10... |
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*/ |
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#include <asm/io.h> |
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#include <asm/core_tsunami.h> |
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#include <linux/init.h> |
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#include <linux/mtd/map.h> |
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#include <linux/mtd/mtd.h> |
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#define FLASH_ENABLE_PORT 0x00C00001 |
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#define FLASH_ENABLE_BYTE 0x01 |
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#define FLASH_DISABLE_BYTE 0x00 |
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#define MAX_TIG_FLASH_SIZE (12*1024*1024) |
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static inline map_word tsunami_flash_read8(struct map_info *map, unsigned long offset) |
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{ |
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map_word val; |
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val.x[0] = tsunami_tig_readb(offset); |
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return val; |
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} |
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static void tsunami_flash_write8(struct map_info *map, map_word value, unsigned long offset) |
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{ |
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tsunami_tig_writeb(value.x[0], offset); |
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} |
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static void tsunami_flash_copy_from( |
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struct map_info *map, void *addr, unsigned long offset, ssize_t len) |
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{ |
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unsigned char *dest; |
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dest = addr; |
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while(len && (offset < MAX_TIG_FLASH_SIZE)) { |
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*dest = tsunami_tig_readb(offset); |
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offset++; |
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dest++; |
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len--; |
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} |
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} |
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static void tsunami_flash_copy_to( |
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struct map_info *map, unsigned long offset, |
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const void *addr, ssize_t len) |
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{ |
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const unsigned char *src; |
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src = addr; |
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while(len && (offset < MAX_TIG_FLASH_SIZE)) { |
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tsunami_tig_writeb(*src, offset); |
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offset++; |
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src++; |
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len--; |
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} |
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} |
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/* |
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* Deliberately don't provide operations wider than 8 bits. I don't |
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* have then and it scares me to think how you could mess up if |
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* you tried to use them. Buswidth is correctly so I'm safe. |
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*/ |
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static struct map_info tsunami_flash_map = { |
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.name = "flash chip on the Tsunami TIG bus", |
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.size = MAX_TIG_FLASH_SIZE, |
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.phys = NO_XIP, |
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.bankwidth = 1, |
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.read = tsunami_flash_read8, |
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.copy_from = tsunami_flash_copy_from, |
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.write = tsunami_flash_write8, |
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.copy_to = tsunami_flash_copy_to, |
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}; |
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static struct mtd_info *tsunami_flash_mtd; |
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static void __exit cleanup_tsunami_flash(void) |
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{ |
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struct mtd_info *mtd; |
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mtd = tsunami_flash_mtd; |
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if (mtd) { |
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mtd_device_unregister(mtd); |
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map_destroy(mtd); |
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} |
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tsunami_flash_mtd = 0; |
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} |
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static const char * const rom_probe_types[] = { |
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"cfi_probe", "jedec_probe", "map_rom", NULL }; |
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static int __init init_tsunami_flash(void) |
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{ |
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const char * const *type; |
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tsunami_tig_writeb(FLASH_ENABLE_BYTE, FLASH_ENABLE_PORT); |
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tsunami_flash_mtd = 0; |
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type = rom_probe_types; |
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for(; !tsunami_flash_mtd && *type; type++) { |
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tsunami_flash_mtd = do_map_probe(*type, &tsunami_flash_map); |
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} |
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if (tsunami_flash_mtd) { |
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tsunami_flash_mtd->owner = THIS_MODULE; |
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mtd_device_register(tsunami_flash_mtd, NULL, 0); |
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return 0; |
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} |
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return -ENXIO; |
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} |
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module_init(init_tsunami_flash); |
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module_exit(cleanup_tsunami_flash);
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