250 lines
6.4 KiB
C
250 lines
6.4 KiB
C
/*
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* Handle mapping of the flash memory access routines
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* on TQM8xxL based devices.
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*
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* based on rpxlite.c
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*
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* Copyright(C) 2001 Kirk Lee <kirk@hpc.ee.ntu.edu.tw>
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*
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* This code is GPLed
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*
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*/
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/*
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* According to TQM8xxL hardware manual, TQM8xxL series have
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* following flash memory organisations:
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* | capacity | | chip type | | bank0 | | bank1 |
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* 2MiB 512Kx16 2MiB 0
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* 4MiB 1Mx16 4MiB 0
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* 8MiB 1Mx16 4MiB 4MiB
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* Thus, we choose CONFIG_MTD_CFI_I2 & CONFIG_MTD_CFI_B4 at
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* kernel configuration.
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*/
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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/init.h>
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#include <linux/slab.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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#include <asm/io.h>
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#define FLASH_ADDR 0x40000000
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#define FLASH_SIZE 0x00800000
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#define FLASH_BANK_MAX 4
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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 *mymtd;
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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 void __iomem *start_scan_addr;
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/*
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* Here are partition information for all known TQM8xxL series devices.
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* See include/linux/mtd/partitions.h for definition of the mtd_partition
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* structure.
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*
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* The *_max_flash_size is the maximum possible mapped flash size which
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* is not necessarily the actual flash size. It must correspond to the
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* value specified in the mapping definition defined by the
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* "struct map_desc *_io_desc" for the corresponding machine.
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*/
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/* Currently, TQM8xxL has up to 8MiB flash */
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static unsigned long tqm8xxl_max_flash_size = 0x00800000;
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/* partition definition for first flash bank
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* (cf. "drivers/char/flash_config.c")
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*/
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static struct mtd_partition tqm8xxl_partitions[] = {
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{
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.name = "ppcboot",
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.offset = 0x00000000,
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.size = 0x00020000, /* 128KB */
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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", /* default kernel image */
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.offset = 0x00020000,
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.size = 0x000e0000,
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.mask_flags = MTD_WRITEABLE, /* force read-only */
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},
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{
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.name = "user",
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.offset = 0x00100000,
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.size = 0x00100000,
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},
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{
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.name = "initrd",
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.offset = 0x00200000,
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.size = 0x00200000,
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}
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};
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/* partition definition for second flash bank */
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static struct mtd_partition tqm8xxl_fs_partitions[] = {
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{
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.name = "cramfs",
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.offset = 0x00000000,
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.size = 0x00200000,
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},
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{
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.name = "jffs",
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.offset = 0x00200000,
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.size = 0x00200000,
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//.size = MTDPART_SIZ_FULL,
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}
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};
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static int __init init_tqm_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 TQM8xxL board info data */
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bd_t *bd = (bd_t *)__res;
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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 = ioremap(flash_addr, flash_size);
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if (!start_scan_addr) {
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printk(KERN_WARNING "%s:Failed to ioremap address:0x%x\n", __func__, 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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printk(KERN_INFO "%s: chip probing count %d\n", __func__, idx);
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map_banks[idx] = kzalloc(sizeof(struct map_info), GFP_KERNEL);
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if(map_banks[idx] == NULL) {
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ret = -ENOMEM;
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/* FIXME: What if some MTD devices were probed already? */
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goto error_mem;
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}
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map_banks[idx]->name = kmalloc(16, GFP_KERNEL);
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if (!map_banks[idx]->name) {
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ret = -ENOMEM;
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/* FIXME: What if some MTD devices were probed already? */
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goto error_mem;
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}
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sprintf(map_banks[idx]->name, "TQM8xxL%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 = start_scan_addr;
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map_banks[idx]->phys = flash_addr;
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/* FIXME: This looks utterly bogus, but I'm trying to
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preserve the behaviour of the original (shown here)...
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map_banks[idx]->map_priv_1 =
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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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*/
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if (idx && mtd_banks[idx-1]) {
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map_banks[idx]->virt += mtd_banks[idx-1]->size;
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map_banks[idx]->phys += mtd_banks[idx-1]->size;
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}
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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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printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __func__, 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(KERN_NOTICE "TQM8xxL: No support 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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/*
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* Select Static partition definitions
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*/
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part_banks[0].mtd_part = tqm8xxl_partitions;
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part_banks[0].type = "Static image";
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part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions);
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part_banks[1].mtd_part = tqm8xxl_fs_partitions;
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part_banks[1].type = "Static file system";
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part_banks[1].nums = ARRAY_SIZE(tqm8xxl_fs_partitions);
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for(idx = 0; idx < num_banks ; idx++) {
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if (part_banks[idx].nums == 0)
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printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx);
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else
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printk(KERN_NOTICE "TQM flash%d: Using %s partition definition\n",
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idx, part_banks[idx].type);
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mtd_device_register(mtd_banks[idx], part_banks[idx].mtd_part,
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part_banks[idx].nums);
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}
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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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kfree(map_banks[idx]->name);
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map_banks[idx]->name = NULL;
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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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error:
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iounmap(start_scan_addr);
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return ret;
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}
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static void __exit cleanup_tqm_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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mtd_device_unregister(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(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_tqm_mtd);
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module_exit(cleanup_tqm_mtd);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>");
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MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards");
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