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