-/*
- * 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/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] = kzalloc(sizeof(struct map_info), GFP_KERNEL);
- if (map_banks[idx] == NULL) {
- ret = -ENOMEM;
- goto error_mem;
- }
- map_banks[idx]->name = kzalloc(16, GFP_KERNEL);
- if (map_banks[idx]->name == NULL) {
- ret = -ENOMEM;
- goto error_mem;
- }
-
- 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");
projects / linux-2.6 / commitdiff