diff options
Diffstat (limited to 'drivers/mtd/maps/tqm834x.c')
| -rw-r--r-- | drivers/mtd/maps/tqm834x.c | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/drivers/mtd/maps/tqm834x.c b/drivers/mtd/maps/tqm834x.c new file mode 100644 index 0000000..c7ae9a5 --- /dev/null +++ b/drivers/mtd/maps/tqm834x.c @@ -0,0 +1,291 @@ +/* + * drivers/mtd/maps/tqm834x.c + * + * MTD mapping driver for TQM834x boards + * + * Copyright 2005 Wolfgang Denk, DENX Software Engineering, <wd@denx.de>. + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program is licensed "as is" without any warranty of any + * kind, whether express or implied. + * + */ + +#include <linux/config.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <asm/io.h> +#include <asm/ppcboot.h> + +#include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> +#include <linux/mtd/partitions.h> + +#define FLASH_BANK_MAX 2 + +extern unsigned char __res[]; + +/* trivial struct to describe partition information */ +struct mtd_part_def +{ + int nums; + unsigned char *type; + struct mtd_partition* mtd_part; +}; + +static struct mtd_info* mtd_banks[FLASH_BANK_MAX]; +static struct map_info* map_banks[FLASH_BANK_MAX]; +static struct mtd_part_def part_banks[FLASH_BANK_MAX]; + +static unsigned long num_banks; +static unsigned long start_scan_addr; + +#ifdef CONFIG_MTD_PARTITIONS +/* + * The following defines the partition layout of TQM834x boards. + * + * See include/linux/mtd/partitions.h for definition of the + * mtd_partition structure. + * + * Assume minimal initial size of 4 MiB per bank, will be updated + * later in init_tqm834x_mtd() routine. + */ + +/* Partition definition for the first flash bank which is always present. */ +static struct mtd_partition tqm834x_partitions_bank1[] = { + { + .name = "u-boot", /* u-boot firmware */ + .offset = 0x00000000, + .size = 0x00040000, /* 256 KiB */ + /*mask_flags: MTD_WRITEABLE, * force read-only */ + }, + { + .name = "env", /* u-boot environment */ + .offset = 0x00040000, + .size = 0x00020000, /* 128 KiB */ + /*mask_flags: MTD_WRITEABLE, * force read-only */ + }, + { + .name = "kernel", /* linux kernel image */ + .offset = 0x00060000, + .size = 0x00100000, /* 1 MiB */ + /*mask_flags: MTD_WRITEABLE, * force read-only */ + }, + { + .name = "initrd", /* ramdisk image */ + .offset = 0x00160000, + .size = 0x00200000, /* 2 MiB */ + }, + { + .name = "user", /* user data */ + .offset = 0x00360000, + .size = 0x000a0000, /* remaining space */ + /* NOTE: this parttion size is re-calcated in */ + /* init_tqm834x_mtd() to cover actual remaining space. */ + }, +}; + +/* Partition definition for the second flash bank which may be present on some + * TQM834x boards. + */ +static struct mtd_partition tqm834x_partitions_bank2[] = { + { + .name = "jffs2", /* jffs2 filesystem */ + .offset = 0x00000000, + .size = 0x00400000, /* whole device */ + /* NOTE: this parttion size is re-calcated in */ + /* init_tqm834x_mtd() to cover actual device size. */ + }, +}; + +#endif /* CONFIG_MTD_PARTITIONS */ + +static int __init init_tqm834x_mtd(void) +{ + int idx = 0, ret = 0; + unsigned long flash_addr, flash_size, mtd_size = 0; + + /* pointer to TQM834x board info data */ + bd_t *bd = (bd_t *)__res; +#ifdef CONFIG_MTD_CMDLINE_PARTS + int n; + char mtdid[4]; + const char *part_probes[] = { "cmdlinepart", NULL }; +#endif + + flash_addr = bd->bi_flashstart; + flash_size = bd->bi_flashsize; + + /* request maximum flash size address space */ + start_scan_addr = (unsigned long)ioremap(flash_addr, flash_size); + if (!start_scan_addr) { + printk("%s: Failed to ioremap address: 0x%lx\n", + __FUNCTION__, flash_addr); + return -EIO; + } + + for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) { + if (mtd_size >= flash_size) + break; + + pr_debug("%s: chip probing count %d\n", __FUNCTION__, idx); + + map_banks[idx] = + (struct map_info *)kmalloc(sizeof(struct map_info), + GFP_KERNEL); + if (map_banks[idx] == NULL) { + ret = -ENOMEM; + goto error_mem; + } + memset((void *)map_banks[idx], 0, sizeof(struct map_info)); + map_banks[idx]->name = (char *)kmalloc(16, GFP_KERNEL); + if (map_banks[idx]->name == NULL) { + ret = -ENOMEM; + goto error_mem; + } + memset((void *)map_banks[idx]->name, 0, 16); + + sprintf(map_banks[idx]->name, "TQM834x-%d", idx); + map_banks[idx]->size = flash_size; + map_banks[idx]->bankwidth = 4; + + simple_map_init(map_banks[idx]); + + map_banks[idx]->virt = (void __iomem *) + (start_scan_addr + ((idx > 0) ? + (mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0)); + map_banks[idx]->phys = + flash_addr + ((idx > 0) ? + (mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0); + + /* start to probe flash chips */ + mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]); + if (mtd_banks[idx]) { + mtd_banks[idx]->owner = THIS_MODULE; + mtd_size += mtd_banks[idx]->size; + num_banks++; + pr_debug("%s: bank %ld, name: %s, size: %d bytes \n", + __FUNCTION__, num_banks, + mtd_banks[idx]->name, mtd_banks[idx]->size); + } + } + + /* no supported flash chips found */ + if (!num_banks) { + printk("TQM834x: No supported flash chips found!\n"); + ret = -ENXIO; + goto error_mem; + } + +#ifdef CONFIG_MTD_PARTITIONS + /* + * Select static partition definitions + */ + n = ARRAY_SIZE(tqm834x_partitions_bank1); + part_banks[0].mtd_part = tqm834x_partitions_bank1; + part_banks[0].type = "static image bank1"; + part_banks[0].nums = n; + + /* update last partition size to cover actual remaining space */ + tqm834x_partitions_bank1[n - 1].size = + mtd_banks[0]->size - + tqm834x_partitions_bank1[n - 1].offset; + + /* check if we have second bank? */ + if (num_banks == 2) { + n = ARRAY_SIZE(tqm834x_partitions_bank2); + part_banks[1].mtd_part = tqm834x_partitions_bank2; + part_banks[1].type = "static image bank2"; + part_banks[1].nums = n; + + /* update last partition size to cover actual remaining space */ + tqm834x_partitions_bank2[n - 1].size = + mtd_banks[1]->size - + tqm834x_partitions_bank2[n - 1].offset; + } + + for(idx = 0; idx < num_banks ; idx++) { +#ifdef CONFIG_MTD_CMDLINE_PARTS + sprintf(mtdid, "%d", idx); + n = parse_mtd_partitions(mtd_banks[idx], + part_probes, + &part_banks[idx].mtd_part, + 0); + pr_debug("%s: %d command line partitions on bank %s\n", + __FUNCTION__, n, mtdid); + if (n > 0) { + part_banks[idx].type = "command line"; + part_banks[idx].nums = n; + } +#endif /* CONFIG_MTD_CMDLINE_PARTS */ + if (part_banks[idx].nums == 0) { + printk(KERN_NOTICE + "TQM834x flash bank %d: no partition info " + "available, registering whole device\n", idx); + add_mtd_device(mtd_banks[idx]); + } else { + printk(KERN_NOTICE + "TQM834x flash bank %d: Using %s partition " + "definition\n", idx, part_banks[idx].type); + add_mtd_partitions(mtd_banks[idx], + part_banks[idx].mtd_part, + part_banks[idx].nums); + } + } +#else /* ! CONFIG_MTD_PARTITIONS */ + printk(KERN_NOTICE "TQM834x flash: registering %d flash banks " + "at once\n", num_banks); + + for(idx = 0 ; idx < num_banks ; idx++) + add_mtd_device(mtd_banks[idx]); + +#endif /* CONFIG_MTD_PARTITIONS */ + + return 0; +error_mem: + for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) { + if (map_banks[idx] != NULL) { + if (map_banks[idx]->name != NULL) { + kfree(map_banks[idx]->name); + map_banks[idx]->name = NULL; + } + kfree(map_banks[idx]); + map_banks[idx] = NULL; + } + } + + iounmap((void *)start_scan_addr); + + return ret; +} + +static void __exit cleanup_tqm834x_mtd(void) +{ + unsigned int idx = 0; + for(idx = 0 ; idx < num_banks ; idx++) { + /* destroy mtd_info previously allocated */ + if (mtd_banks[idx]) { + del_mtd_partitions(mtd_banks[idx]); + map_destroy(mtd_banks[idx]); + } + + /* release map_info not used anymore */ + kfree(map_banks[idx]->name); + kfree(map_banks[idx]); + } + + if (start_scan_addr) { + iounmap((void *)start_scan_addr); + start_scan_addr = 0; + } +} + +module_init(init_tqm834x_mtd); +module_exit(cleanup_tqm834x_mtd); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Wolfgang Denk <wd@denx.de>"); +MODULE_DESCRIPTION("MTD map driver for TQM834x boards"); |