/*
* Ceiva flash memory driver.
* Copyright (C) 2002 Rob Scott <rscott@mtrob.fdns.net>
*
* Note: this driver supports jedec compatible devices. Modification
* for CFI compatible devices should be straight forward: change
* jedec_probe to cfi_probe.
*
* Based on: sa1100-flash.c, which has the following copyright:
* Flash memory access on SA11x0 based devices
*
* (C) 2000 Nicolas Pitre <nico@fluxnic.net>
*
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/ioport.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 <linux/mtd/concat.h>
#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <asm/io.h>
#include <asm/sizes.h>
/*
* This isn't complete yet, so...
*/
#define CONFIG_MTD_CEIVA_STATICMAP
#ifdef CONFIG_MTD_CEIVA_STATICMAP
/*
* See include/linux/mtd/partitions.h for definition of the mtd_partition
* structure.
*
* Please note:
* 1. The flash size given should be the largest flash size that can
* be accommodated.
*
* 2. The bus width must defined in clps_setup_flash.
*
* The MTD layer will detect flash chip aliasing and reduce the size of
* the map accordingly.
*
*/
#ifdef CONFIG_ARCH_CEIVA
/* Flash / Partition sizing */
/* For the 28F8003, we use the block mapping to calcuate the sizes */
#define MAX_SIZE_KiB (16 + 8 + 8 + 96 + (7*128))
#define BOOT_PARTITION_SIZE_KiB (16)
#define PARAMS_PARTITION_SIZE_KiB (8)
#define KERNEL_PARTITION_SIZE_KiB (4*128)
/* Use both remaining portion of first flash, and all of second flash */
#define ROOT_PARTITION_SIZE_KiB (3*128) + (8*128)
static struct mtd_partition ceiva_partitions[] = {
{
.name = "Ceiva BOOT partition",
.size = BOOT_PARTITION_SIZE_KiB*1024,
.offset = 0,
},{
.name = "Ceiva parameters partition",
.size = PARAMS_PARTITION_SIZE_KiB*1024,
.offset = (16 + 8) * 1024,
},{
.name = "Ceiva kernel partition",
.size = (KERNEL_PARTITION_SIZE_KiB)*1024,
.offset = 0x20000,
},{
.name = "Ceiva root filesystem partition",
.offset = MTDPART_OFS_APPEND,
.size = (ROOT_PARTITION_SIZE_KiB)*1024,
}
};
#endif
static int __init clps_static_partitions(struct mtd_partition **parts)
{
int nb_parts = 0;
#ifdef CONFIG_ARCH_CEIVA
if (machine_is_ceiva()) {
*parts = ceiva_partitions;
nb_parts = ARRAY_SIZE(ceiva_partitions);
}
#endif
return nb_parts;
}
#endif
struct clps_info {
unsigned long base;
unsigned long size;
int width;
void *vbase;
struct map_info *map;
struct mtd_info *mtd;
struct resource *res;
};
#define NR_SUBMTD 4
static struct clps_info info[NR_SUBMTD];
static int __init clps_setup_mtd(struct clps_info *clps, int nr, struct mtd_info **rmtd)
{
struct mtd_info *subdev[nr];
struct map_info *maps;
int i, found = 0, ret = 0;
/*
* Allocate the map_info structs in one go.
*/
maps = kzalloc(sizeof(struct map_info) * nr, GFP_KERNEL);
if (!maps)
return -ENOMEM;
/*
* Claim and then map the memory regions.
*/
for (i = 0; i < nr; i++) {
if (clps[i].base == (unsigned long)-1)
break;
clps[i].res = request_mem_region(clps[i].base, clps[i].size, "clps flash");
if (!clps[i].res) {
ret = -EBUSY;
break;
}
clps[i].map = maps + i;
clps[i].map->name = "clps flash";
clps[i].map->phys = clps[i].base;
clps[i].vbase = ioremap(clps[i].base, clps[i].size);
if (!clps[i].vbase) {
ret = -ENOMEM;
break;
}
clps[i].map->virt = (void __iomem *)clps[i].vbase;
clps[i].map->bankwidth = clps[i].width;
clps[i].map->size = clps[i].size;
simple_map_init(&clps[i].map);
clps[i].mtd = do_map_probe("jedec_probe", clps[i].map);
if (clps[i].mtd == NULL) {
ret = -ENXIO;
break;
}
clps[i].mtd->owner = THIS_MODULE;
subdev[i] = clps[i].mtd;
printk(KERN_INFO "clps flash: JEDEC device at 0x%08lx, %dMiB, "
"%d-bit\n", clps[i].base, clps[i].mtd->size >> 20,
clps[i].width * 8);
found += 1;
}
/*
* ENXIO is special. It means we didn't find a chip when
* we probed. We need to tear down the mapping, free the
* resource and mark it as such.
*/
if (ret == -ENXIO) {
iounmap(clps[i].vbase);
clps[i].vbase = NULL;
release_resource(clps[i].res);
clps[i].res = NULL;
}
/*
* If we found one device, don't bother with concat support.
* If we found multiple devices, use concat if we have it
* available, otherwise fail.
*/
if (ret == 0 || ret == -ENXIO) {
if (found == 1) {
*rmtd = subdev[0];
ret = 0;
} else if (found > 1) {
/*
* We detected multiple devices. Concatenate
* them together.
*/
*rmtd = mtd_concat_create(subdev, found,
"clps flash");
if (*rmtd == NULL)
ret = -ENXIO;
}
}
/*
* If we failed, clean up.
*/
if (ret) {
do {
if (clps[i].mtd)
map_destroy(clps[i].mtd);
if (clps[i].vbase)
iounmap(clps[i].vbase);
if (clps[i].res)
release_resource(clps[i].res);
} while (i--);
kfree(maps);
}
return ret;
}
static void __exit clps_destroy_mtd(struct clps_info *clps, struct mtd_info *mtd)
{
int i;
del_mtd_partitions(mtd);
if (mtd != clps[0].mtd)
mtd_concat_destroy(mtd);
for (i = NR_SUBMTD; i >= 0; i--) {
if (clps[i].mtd)
map_destroy(clps[i].mtd);
if (clps[i].vbase)
iounmap(clps[i].vbase);
if (clps[i].res)
release_resource(clps[i].res);
}
kfree(clps[0].map);
}
/*
* We define the memory space, size, and width for the flash memory
* space here.
*/
static int __init clps_setup_flash(void)
{
int nr = 0;
#ifdef CONFIG_ARCH_CEIVA
if (machine_is_ceiva()) {
info[0].base = CS0_PHYS_BASE;
info[0].size = SZ_32M;
info[0].width = CEIVA_FLASH_WIDTH;
info[1].base = CS1_PHYS_BASE;
info[1].size = SZ_32M;
info[1].width = CEIVA_FLASH_WIDTH;
nr = 2;
}
#endif
return nr;
}
static struct mtd_partition *parsed_parts;
static const char *probes[] = { "cmdlinepart", "RedBoot", NULL };
static void __init clps_locate_partitions(struct mtd_info *mtd)
{
const char *part_type = NULL;
int nr_parts = 0;
do {
/*
* Partition selection stuff.
*/
nr_parts = parse_mtd_partitions(mtd, probes, &parsed_parts, 0);
if (nr_parts > 0) {
part_type = "command line";
break;
}
#ifdef CONFIG_MTD_CEIVA_STATICMAP
nr_parts = clps_static_partitions(&parsed_parts);
if (nr_parts > 0) {
part_type = "static";
break;
}
printk("found: %d partitions\n", nr_parts);
#endif
} while (0);
if (nr_parts == 0) {
printk(KERN_NOTICE "clps flash: no partition info "
"available, registering whole flash\n");
add_mtd_device(mtd);
} else {
printk(KERN_NOTICE "clps flash: using %s partition "
"definition\n", part_type);
add_mtd_partitions(mtd, parsed_parts, nr_parts);
}
/* Always succeeds. */
}
static void __exit clps_destroy_partitions(void)
{
kfree(parsed_parts);
}
static struct mtd_info *mymtd;
static int __init clps_mtd_init(void)
{
int ret;
int nr;
nr = clps_setup_flash();
if (nr < 0)
return nr;
ret = clps_setup_mtd(info, nr, &mymtd);
if (ret)
return ret;
clps_locate_partitions(mymtd);
return 0;
}
static void __exit clps_mtd_cleanup(void)
{
clps_destroy_mtd(info, mymtd);
clps_destroy_partitions();
}
module_init(clps_mtd_init);
module_exit(clps_mtd_cleanup);
MODULE_AUTHOR("Rob Scott");
MODULE_DESCRIPTION("Cirrus Logic JEDEC map driver");
MODULE_LICENSE("GPL");
