+++ /dev/null
-/*
- * 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;
-
- mtd_device_unregister(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");
- mtd_device_register(mtd, NULL, 0);
- } else {
- printk(KERN_NOTICE "clps flash: using %s partition "
- "definition\n", part_type);
- mtd_device_register(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");
projects / kernel / kernel-generic.git / commitdiff