diff options
Diffstat (limited to 'drivers/mtd/maps/tqm8xxl.c')
| -rw-r--r-- | drivers/mtd/maps/tqm8xxl.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/drivers/mtd/maps/tqm8xxl.c b/drivers/mtd/maps/tqm8xxl.c new file mode 100644 index 00000000000..995e9991cb8 --- /dev/null +++ b/drivers/mtd/maps/tqm8xxl.c @@ -0,0 +1,263 @@ +/* + * Handle mapping of the flash memory access routines + * on TQM8xxL based devices. + * + * $Id: tqm8xxl.c,v 1.13 2004/10/20 22:21:53 dwmw2 Exp $ + * + * 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/config.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <asm/io.h> + +#include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> +#include <linux/mtd/partitions.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 + +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", __FUNCTION__, 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", __FUNCTION__, idx); + + map_banks[idx] = (struct map_info *)kmalloc(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; + } + + memset((void *)map_banks[idx], 0, sizeof(struct map_info)); + 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", __FUNCTION__, 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) { + if(map_banks[idx]->name != 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"); |