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