mtdram.c revision 402d326519c1a4859c527702383f4e60f606ef52
11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * mtdram - a test mtd device 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Author: Alexander Larsson <alex@cendio.se> 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copyright (c) 1999 Alexander Larsson <alex@cendio.se> 6c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel * Copyright (c) 2005 Joern Engel <joern@wh.fh-wedel.de> 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This code is GPL 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/module.h> 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/slab.h> 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/ioport.h> 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/vmalloc.h> 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/init.h> 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/mtd/compatmac.h> 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/mtd/mtd.h> 19456d9fc92eb8635d53e8facc57764464b8759173Adrian Bunk#include <linux/mtd/mtdram.h> 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned long total_size = CONFIG_MTDRAM_TOTAL_SIZE; 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned long erase_size = CONFIG_MTDRAM_ERASE_SIZE; 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define MTDRAM_TOTAL_SIZE (total_size * 1024) 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define MTDRAM_ERASE_SIZE (erase_size * 1024) 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 26c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel#ifdef MODULE 27c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engelmodule_param(total_size, ulong, 0); 28c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern EngelMODULE_PARM_DESC(total_size, "Total device size in KiB"); 29c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engelmodule_param(erase_size, ulong, 0); 30c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern EngelMODULE_PARM_DESC(erase_size, "Device erase block size in KiB"); 31c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel#endif 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds// We could store these in the mtd structure, but we only support 1 device.. 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct mtd_info *mtd_info; 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 36c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engelstatic int ram_erase(struct mtd_info *mtd, struct erase_info *instr) 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 38c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel if (instr->addr + instr->len > mtd->size) 39c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel return -EINVAL; 40c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel 41c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel memset((char *)mtd->priv + instr->addr, 0xff, instr->len); 42c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel 43c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel instr->state = MTD_ERASE_DONE; 44c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel mtd_erase_callback(instr); 45c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel 46c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel return 0; 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 49c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engelstatic int ram_point(struct mtd_info *mtd, loff_t from, size_t len, 50a98889f3d8882995b5aa2255b931cf0202325cc0Jared Hulbert size_t *retlen, void **virt, resource_size_t *phys) 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 52c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel if (from + len > mtd->size) 53c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel return -EINVAL; 54c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel 55a98889f3d8882995b5aa2255b931cf0202325cc0Jared Hulbert /* can we return a physical address with this driver? */ 56a98889f3d8882995b5aa2255b931cf0202325cc0Jared Hulbert if (phys) 57a98889f3d8882995b5aa2255b931cf0202325cc0Jared Hulbert return -EINVAL; 58a98889f3d8882995b5aa2255b931cf0202325cc0Jared Hulbert 59a98889f3d8882995b5aa2255b931cf0202325cc0Jared Hulbert *virt = mtd->priv + from; 60c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel *retlen = len; 61c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel return 0; 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 64a98889f3d8882995b5aa2255b931cf0202325cc0Jared Hulbertstatic void ram_unpoint(struct mtd_info *mtd, loff_t from, size_t len) 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 68402d326519c1a4859c527702383f4e60f606ef52David Howells/* 69402d326519c1a4859c527702383f4e60f606ef52David Howells * Allow NOMMU mmap() to directly map the device (if not NULL) 70402d326519c1a4859c527702383f4e60f606ef52David Howells * - return the address to which the offset maps 71402d326519c1a4859c527702383f4e60f606ef52David Howells * - return -ENOSYS to indicate refusal to do the mapping 72402d326519c1a4859c527702383f4e60f606ef52David Howells */ 73402d326519c1a4859c527702383f4e60f606ef52David Howellsstatic unsigned long ram_get_unmapped_area(struct mtd_info *mtd, 74402d326519c1a4859c527702383f4e60f606ef52David Howells unsigned long len, 75402d326519c1a4859c527702383f4e60f606ef52David Howells unsigned long offset, 76402d326519c1a4859c527702383f4e60f606ef52David Howells unsigned long flags) 77402d326519c1a4859c527702383f4e60f606ef52David Howells{ 78402d326519c1a4859c527702383f4e60f606ef52David Howells return (unsigned long) mtd->priv + offset; 79402d326519c1a4859c527702383f4e60f606ef52David Howells} 80402d326519c1a4859c527702383f4e60f606ef52David Howells 811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int ram_read(struct mtd_info *mtd, loff_t from, size_t len, 82c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel size_t *retlen, u_char *buf) 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 84c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel if (from + len > mtd->size) 85c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel return -EINVAL; 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 87c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel memcpy(buf, mtd->priv + from, len); 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 89c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel *retlen = len; 90c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel return 0; 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int ram_write(struct mtd_info *mtd, loff_t to, size_t len, 94c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel size_t *retlen, const u_char *buf) 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 96c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel if (to + len > mtd->size) 97c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel return -EINVAL; 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 99c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel memcpy((char *)mtd->priv + to, buf, len); 1001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 101c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel *retlen = len; 102c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel return 0; 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void __exit cleanup_mtdram(void) 1061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 107c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel if (mtd_info) { 108c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel del_mtd_device(mtd_info); 109f9101210e7aa72daf92722d451a2f7e3af5f781fJesper Juhl vfree(mtd_info->priv); 110c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel kfree(mtd_info); 111c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel } 1121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 114c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engelint mtdram_init_device(struct mtd_info *mtd, void *mapped_address, 115c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel unsigned long size, char *name) 1161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 117c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel memset(mtd, 0, sizeof(*mtd)); 118c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel 119c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel /* Setup the MTD structure */ 120c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel mtd->name = name; 12121c8db9eff95260e543535dfc6f27164c4c0c0ffDavid Woodhouse mtd->type = MTD_RAM; 122c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel mtd->flags = MTD_CAP_RAM; 123c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel mtd->size = size; 124783ed81ff39d3f938a6b2efd09fbad96e41e5c1fArtem B. Bityutskiy mtd->writesize = 1; 125c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel mtd->erasesize = MTDRAM_ERASE_SIZE; 126c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel mtd->priv = mapped_address; 127c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel 128c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel mtd->owner = THIS_MODULE; 129c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel mtd->erase = ram_erase; 130c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel mtd->point = ram_point; 131c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel mtd->unpoint = ram_unpoint; 132402d326519c1a4859c527702383f4e60f606ef52David Howells mtd->get_unmapped_area = ram_get_unmapped_area; 133c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel mtd->read = ram_read; 134c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel mtd->write = ram_write; 135c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel 136c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel if (add_mtd_device(mtd)) { 137c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel return -EIO; 138c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel } 139c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel 140c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel return 0; 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int __init init_mtdram(void) 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 145c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel void *addr; 146c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel int err; 147c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel 148c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel if (!total_size) 149c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel return -EINVAL; 150c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel 151c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel /* Allocate some memory */ 152c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL); 153c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel if (!mtd_info) 154c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel return -ENOMEM; 155c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel 156c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel addr = vmalloc(MTDRAM_TOTAL_SIZE); 157c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel if (!addr) { 158c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel kfree(mtd_info); 159c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel mtd_info = NULL; 160c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel return -ENOMEM; 161c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel } 162c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel err = mtdram_init_device(mtd_info, addr, MTDRAM_TOTAL_SIZE, "mtdram test device"); 163c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel if (err) { 164c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel vfree(addr); 165c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel kfree(mtd_info); 166c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel mtd_info = NULL; 167c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel return err; 168c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel } 169c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE); 170c13cbf3b5086d4ed51360b86b6b0ef8b82b179dcJoern Engel return err; 1711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_init(init_mtdram); 1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_exit(cleanup_mtdram); 1751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_LICENSE("GPL"); 1771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>"); 1781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_DESCRIPTION("Simulated MTD driver for testing"); 179