diff options
Diffstat (limited to 'drivers/mtd/devices/mtdram.c')
| -rw-r--r-- | drivers/mtd/devices/mtdram.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/drivers/mtd/devices/mtdram.c b/drivers/mtd/devices/mtdram.c new file mode 100644 index 000000000000..edac4156d69c --- /dev/null +++ b/drivers/mtd/devices/mtdram.c @@ -0,0 +1,235 @@ +/* + * mtdram - a test mtd device + * $Id: mtdram.c,v 1.35 2005/01/05 18:05:12 dwmw2 Exp $ + * Author: Alexander Larsson <alex@cendio.se> + * + * Copyright (c) 1999 Alexander Larsson <alex@cendio.se> + * + * This code is GPL + * + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/ioport.h> +#include <linux/vmalloc.h> +#include <linux/init.h> +#include <linux/mtd/compatmac.h> +#include <linux/mtd/mtd.h> + +#ifndef CONFIG_MTDRAM_ABS_POS + #define CONFIG_MTDRAM_ABS_POS 0 +#endif + +#if CONFIG_MTDRAM_ABS_POS > 0 + #include <asm/io.h> +#endif + +#ifdef MODULE +static unsigned long total_size = CONFIG_MTDRAM_TOTAL_SIZE; +static unsigned long erase_size = CONFIG_MTDRAM_ERASE_SIZE; +module_param(total_size,ulong,0); +MODULE_PARM_DESC(total_size, "Total device size in KiB"); +module_param(erase_size,ulong,0); +MODULE_PARM_DESC(erase_size, "Device erase block size in KiB"); +#define MTDRAM_TOTAL_SIZE (total_size * 1024) +#define MTDRAM_ERASE_SIZE (erase_size * 1024) +#else +#define MTDRAM_TOTAL_SIZE (CONFIG_MTDRAM_TOTAL_SIZE * 1024) +#define MTDRAM_ERASE_SIZE (CONFIG_MTDRAM_ERASE_SIZE * 1024) +#endif + + +// We could store these in the mtd structure, but we only support 1 device.. +static struct mtd_info *mtd_info; + + +static int +ram_erase(struct mtd_info *mtd, struct erase_info *instr) +{ + DEBUG(MTD_DEBUG_LEVEL2, "ram_erase(pos:%ld, len:%ld)\n", (long)instr->addr, (long)instr->len); + if (instr->addr + instr->len > mtd->size) { + DEBUG(MTD_DEBUG_LEVEL1, "ram_erase() out of bounds (%ld > %ld)\n", (long)(instr->addr + instr->len), (long)mtd->size); + return -EINVAL; + } + + memset((char *)mtd->priv + instr->addr, 0xff, instr->len); + + instr->state = MTD_ERASE_DONE; + mtd_erase_callback(instr); + + return 0; +} + +static int ram_point (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf) +{ + if (from + len > mtd->size) + return -EINVAL; + + *mtdbuf = mtd->priv + from; + *retlen = len; + return 0; +} + +static void ram_unpoint (struct mtd_info *mtd, u_char *addr, loff_t from, + size_t len) +{ + DEBUG(MTD_DEBUG_LEVEL2, "ram_unpoint\n"); +} + +static int ram_read(struct mtd_info *mtd, loff_t from, size_t len, + size_t *retlen, u_char *buf) +{ + DEBUG(MTD_DEBUG_LEVEL2, "ram_read(pos:%ld, len:%ld)\n", (long)from, (long)len); + if (from + len > mtd->size) { + DEBUG(MTD_DEBUG_LEVEL1, "ram_read() out of bounds (%ld > %ld)\n", (long)(from + len), (long)mtd->size); + return -EINVAL; + } + + memcpy(buf, mtd->priv + from, len); + + *retlen=len; + return 0; +} + +static int ram_write(struct mtd_info *mtd, loff_t to, size_t len, + size_t *retlen, const u_char *buf) +{ + DEBUG(MTD_DEBUG_LEVEL2, "ram_write(pos:%ld, len:%ld)\n", (long)to, (long)len); + if (to + len > mtd->size) { + DEBUG(MTD_DEBUG_LEVEL1, "ram_write() out of bounds (%ld > %ld)\n", (long)(to + len), (long)mtd->size); + return -EINVAL; + } + + memcpy ((char *)mtd->priv + to, buf, len); + + *retlen=len; + return 0; +} + +static void __exit cleanup_mtdram(void) +{ + if (mtd_info) { + del_mtd_device(mtd_info); +#if CONFIG_MTDRAM_TOTAL_SIZE > 0 + if (mtd_info->priv) +#if CONFIG_MTDRAM_ABS_POS > 0 + iounmap(mtd_info->priv); +#else + vfree(mtd_info->priv); +#endif +#endif + kfree(mtd_info); + } +} + +int mtdram_init_device(struct mtd_info *mtd, void *mapped_address, + unsigned long size, char *name) +{ + memset(mtd, 0, sizeof(*mtd)); + + /* Setup the MTD structure */ + mtd->name = name; + mtd->type = MTD_RAM; + mtd->flags = MTD_CAP_RAM; + mtd->size = size; + mtd->erasesize = MTDRAM_ERASE_SIZE; + mtd->priv = mapped_address; + + mtd->owner = THIS_MODULE; + mtd->erase = ram_erase; + mtd->point = ram_point; + mtd->unpoint = ram_unpoint; + mtd->read = ram_read; + mtd->write = ram_write; + + if (add_mtd_device(mtd)) { + return -EIO; + } + + return 0; +} + +#if CONFIG_MTDRAM_TOTAL_SIZE > 0 +#if CONFIG_MTDRAM_ABS_POS > 0 +static int __init init_mtdram(void) +{ + void *addr; + int err; + /* Allocate some memory */ + mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL); + if (!mtd_info) + return -ENOMEM; + + addr = ioremap(CONFIG_MTDRAM_ABS_POS, MTDRAM_TOTAL_SIZE); + if (!addr) { + DEBUG(MTD_DEBUG_LEVEL1, + "Failed to ioremap) memory region of size %ld at ABS_POS:%ld\n", + (long)MTDRAM_TOTAL_SIZE, (long)CONFIG_MTDRAM_ABS_POS); + kfree(mtd_info); + mtd_info = NULL; + return -ENOMEM; + } + err = mtdram_init_device(mtd_info, addr, + MTDRAM_TOTAL_SIZE, "mtdram test device"); + if (err) + { + iounmap(addr); + kfree(mtd_info); + mtd_info = NULL; + return err; + } + memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE); + return err; +} + +#else /* CONFIG_MTDRAM_ABS_POS > 0 */ + +static int __init init_mtdram(void) +{ + void *addr; + int err; + /* Allocate some memory */ + mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL); + if (!mtd_info) + return -ENOMEM; + + addr = vmalloc(MTDRAM_TOTAL_SIZE); + if (!addr) { + DEBUG(MTD_DEBUG_LEVEL1, + "Failed to vmalloc memory region of size %ld\n", + (long)MTDRAM_TOTAL_SIZE); + kfree(mtd_info); + mtd_info = NULL; + return -ENOMEM; + } + err = mtdram_init_device(mtd_info, addr, + MTDRAM_TOTAL_SIZE, "mtdram test device"); + if (err) + { + vfree(addr); + kfree(mtd_info); + mtd_info = NULL; + return err; + } + memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE); + return err; +} +#endif /* !(CONFIG_MTDRAM_ABS_POS > 0) */ + +#else /* CONFIG_MTDRAM_TOTAL_SIZE > 0 */ + +static int __init init_mtdram(void) +{ + return 0; +} +#endif /* !(CONFIG_MTDRAM_TOTAL_SIZE > 0) */ + +module_init(init_mtdram); +module_exit(cleanup_mtdram); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>"); +MODULE_DESCRIPTION("Simulated MTD driver for testing"); + |