slram.c revision ee0e87b174bb41f0310cf089262bf5dd8f95a212
11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*====================================================================== 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds This driver provides a method to access memory not used by the kernel 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds itself (i.e. if the kernel commandline mem=xxx is used). To actually 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds use slram at least mtdblock or mtdchar is required (for block or 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds character device access). 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Usage: 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if compiled as loadable module: 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds modprobe slram map=<name>,<start>,<end/offset> 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if statically linked into the kernel use the following kernel cmd.line 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds slram=<name>,<start>,<end/offset> 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds <name>: name of the device that will be listed in /proc/mtd 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds <start>: start of the memory region, decimal or hex (0xabcdef) 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds <end/offset>: end of the memory region. It's possible to use +0x1234 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds to specify the offset instead of the absolute address 19e5580fbe8a950131b9ccccce0f962811dfb9ef43Thomas Gleixner 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds NOTE: 21af901ca181d92aac3a7dc265144a9081a86d8f39André Goddard Rosa With slram it's only possible to map a contiguous memory region. Therefore 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if there's a device mapped somewhere in the region specified slram will 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds fail to load (see kernel log if modprobe fails). 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds - 26e5580fbe8a950131b9ccccce0f962811dfb9ef43Thomas Gleixner 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Jochen Schaeuble <psionic@psionic.de> 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds======================================================================*/ 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/module.h> 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/uaccess.h> 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/types.h> 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/kernel.h> 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/ptrace.h> 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/slab.h> 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/string.h> 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/timer.h> 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/major.h> 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/fs.h> 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/ioctl.h> 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/init.h> 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/io.h> 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/system.h> 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/mtd/mtd.h> 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define SLRAM_MAX_DEVICES_PARAMS 6 /* 3 parameters / device */ 5014f8351a313f364afbc565f1ddcd43f8cfdccf52Josh Boyer#define SLRAM_BLK_SZ 0x4000 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define T(fmt, args...) printk(KERN_DEBUG fmt, ## args) 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define E(fmt, args...) printk(KERN_NOTICE fmt, ## args) 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldstypedef struct slram_priv { 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds u_char *start; 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds u_char *end; 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} slram_priv_t; 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldstypedef struct slram_mtd_list { 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_info *mtdinfo; 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct slram_mtd_list *next; 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} slram_mtd_list_t; 641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef MODULE 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic char *map[SLRAM_MAX_DEVICES_PARAMS]; 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_param_array(map, charp, NULL, 0); 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_PARM_DESC(map, "List of memory regions to map. \"map=<name>, <start>, <length / end>\""); 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic char *map; 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic slram_mtd_list_t *slram_mtdlist = NULL; 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int slram_erase(struct mtd_info *, struct erase_info *); 77a98889f3d8882995b5aa2255b931cf0202325cc0Jared Hulbertstatic int slram_point(struct mtd_info *, loff_t, size_t, size_t *, void **, 78a98889f3d8882995b5aa2255b931cf0202325cc0Jared Hulbert resource_size_t *); 79a98889f3d8882995b5aa2255b931cf0202325cc0Jared Hulbertstatic void slram_unpoint(struct mtd_info *, loff_t, size_t); 801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int slram_read(struct mtd_info *, loff_t, size_t, size_t *, u_char *); 811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int slram_write(struct mtd_info *, loff_t, size_t, size_t *, const u_char *); 821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int slram_erase(struct mtd_info *mtd, struct erase_info *instr) 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds slram_priv_t *priv = mtd->priv; 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (instr->addr + instr->len > mtd->size) { 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(-EINVAL); 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 90e5580fbe8a950131b9ccccce0f962811dfb9ef43Thomas Gleixner 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memset(priv->start + instr->addr, 0xff, instr->len); 921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 93e5580fbe8a950131b9ccccce0f962811dfb9ef43Thomas Gleixner /* This'll catch a few races. Free the thing before returning :) 941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * I don't feel at all ashamed. This kind of thing is possible anyway 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * with flash, but unlikely. 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds instr->state = MTD_ERASE_DONE; 991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mtd_erase_callback(instr); 1011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(0); 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int slram_point(struct mtd_info *mtd, loff_t from, size_t len, 106a98889f3d8882995b5aa2255b931cf0202325cc0Jared Hulbert size_t *retlen, void **virt, resource_size_t *phys) 1071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds slram_priv_t *priv = mtd->priv; 1091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 110a98889f3d8882995b5aa2255b931cf0202325cc0Jared Hulbert /* can we return a physical address with this driver? */ 111a98889f3d8882995b5aa2255b931cf0202325cc0Jared Hulbert if (phys) 112a98889f3d8882995b5aa2255b931cf0202325cc0Jared Hulbert return -EINVAL; 113a98889f3d8882995b5aa2255b931cf0202325cc0Jared Hulbert 11414f8351a313f364afbc565f1ddcd43f8cfdccf52Josh Boyer if (from + len > mtd->size) 11514f8351a313f364afbc565f1ddcd43f8cfdccf52Josh Boyer return -EINVAL; 11614f8351a313f364afbc565f1ddcd43f8cfdccf52Josh Boyer 117a98889f3d8882995b5aa2255b931cf0202325cc0Jared Hulbert *virt = priv->start + from; 1181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *retlen = len; 1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(0); 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 122a98889f3d8882995b5aa2255b931cf0202325cc0Jared Hulbertstatic void slram_unpoint(struct mtd_info *mtd, loff_t from, size_t len) 1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int slram_read(struct mtd_info *mtd, loff_t from, size_t len, 1271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t *retlen, u_char *buf) 1281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds slram_priv_t *priv = mtd->priv; 13014f8351a313f364afbc565f1ddcd43f8cfdccf52Josh Boyer 13114f8351a313f364afbc565f1ddcd43f8cfdccf52Josh Boyer if (from > mtd->size) 13214f8351a313f364afbc565f1ddcd43f8cfdccf52Josh Boyer return -EINVAL; 13314f8351a313f364afbc565f1ddcd43f8cfdccf52Josh Boyer 13414f8351a313f364afbc565f1ddcd43f8cfdccf52Josh Boyer if (from + len > mtd->size) 13514f8351a313f364afbc565f1ddcd43f8cfdccf52Josh Boyer len = mtd->size - from; 13614f8351a313f364afbc565f1ddcd43f8cfdccf52Josh Boyer 1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memcpy(buf, priv->start + from, len); 1381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *retlen = len; 1401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(0); 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int slram_write(struct mtd_info *mtd, loff_t to, size_t len, 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t *retlen, const u_char *buf) 1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds slram_priv_t *priv = mtd->priv; 1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14814f8351a313f364afbc565f1ddcd43f8cfdccf52Josh Boyer if (to + len > mtd->size) 14914f8351a313f364afbc565f1ddcd43f8cfdccf52Josh Boyer return -EINVAL; 15014f8351a313f364afbc565f1ddcd43f8cfdccf52Josh Boyer 1511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memcpy(priv->start + to, buf, len); 1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *retlen = len; 1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(0); 1551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*====================================================================*/ 1581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int register_device(char *name, unsigned long start, unsigned long length) 1601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds slram_mtd_list_t **curmtd; 1621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds curmtd = &slram_mtdlist; 1641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while (*curmtd) { 1651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds curmtd = &(*curmtd)->next; 1661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *curmtd = kmalloc(sizeof(slram_mtd_list_t), GFP_KERNEL); 1691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(*curmtd)) { 1701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds E("slram: Cannot allocate new MTD device.\n"); 1711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(-ENOMEM); 1721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 17395b93a0cd46682c6d9e8eea803fda510cb6b863aBurman Yan (*curmtd)->mtdinfo = kzalloc(sizeof(struct mtd_info), GFP_KERNEL); 1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (*curmtd)->next = NULL; 175e5580fbe8a950131b9ccccce0f962811dfb9ef43Thomas Gleixner 1761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((*curmtd)->mtdinfo) { 1771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (*curmtd)->mtdinfo->priv = 17895b93a0cd46682c6d9e8eea803fda510cb6b863aBurman Yan kzalloc(sizeof(slram_priv_t), GFP_KERNEL); 179e5580fbe8a950131b9ccccce0f962811dfb9ef43Thomas Gleixner 1801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(*curmtd)->mtdinfo->priv) { 1811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree((*curmtd)->mtdinfo); 1821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (*curmtd)->mtdinfo = NULL; 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(*curmtd)->mtdinfo) { 1871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds E("slram: Cannot allocate new MTD device.\n"); 1881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(-ENOMEM); 1891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 190e5580fbe8a950131b9ccccce0f962811dfb9ef43Thomas Gleixner 1911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(((slram_priv_t *)(*curmtd)->mtdinfo->priv)->start = 1921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ioremap(start, length))) { 1931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds E("slram: ioremap failed\n"); 1941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 1951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ((slram_priv_t *)(*curmtd)->mtdinfo->priv)->end = 1971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ((slram_priv_t *)(*curmtd)->mtdinfo->priv)->start + length; 1981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (*curmtd)->mtdinfo->name = name; 2011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (*curmtd)->mtdinfo->size = length; 202a6c591eda3078f92e7a3ff3db55f6841e4819fb5Jörn Engel (*curmtd)->mtdinfo->flags = MTD_CAP_RAM; 2031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (*curmtd)->mtdinfo->erase = slram_erase; 2041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (*curmtd)->mtdinfo->point = slram_point; 2051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (*curmtd)->mtdinfo->unpoint = slram_unpoint; 2061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (*curmtd)->mtdinfo->read = slram_read; 2071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (*curmtd)->mtdinfo->write = slram_write; 2081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (*curmtd)->mtdinfo->owner = THIS_MODULE; 20921c8db9eff95260e543535dfc6f27164c4c0c0ffDavid Woodhouse (*curmtd)->mtdinfo->type = MTD_RAM; 21014f8351a313f364afbc565f1ddcd43f8cfdccf52Josh Boyer (*curmtd)->mtdinfo->erasesize = SLRAM_BLK_SZ; 21117ffc7ba6d7ea68b8d5f55a5ca1b87163e69720dArtem B. Bityutskiy (*curmtd)->mtdinfo->writesize = 1; 2121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 213ee0e87b174bb41f0310cf089262bf5dd8f95a212Jamie Iles if (mtd_device_register((*curmtd)->mtdinfo, NULL, 0)) { 2141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds E("slram: Failed to register new device\n"); 2151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iounmap(((slram_priv_t *)(*curmtd)->mtdinfo->priv)->start); 2161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree((*curmtd)->mtdinfo->priv); 2171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree((*curmtd)->mtdinfo); 2181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(-EAGAIN); 2191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds T("slram: Registered device %s from %luKiB to %luKiB\n", name, 2211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (start / 1024), ((start + length) / 1024)); 2221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds T("slram: Mapped from 0x%p to 0x%p\n", 2231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ((slram_priv_t *)(*curmtd)->mtdinfo->priv)->start, 2241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ((slram_priv_t *)(*curmtd)->mtdinfo->priv)->end); 225e5580fbe8a950131b9ccccce0f962811dfb9ef43Thomas Gleixner return(0); 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void unregister_devices(void) 2291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds slram_mtd_list_t *nextitem; 2311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while (slram_mtdlist) { 2331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds nextitem = slram_mtdlist->next; 234ee0e87b174bb41f0310cf089262bf5dd8f95a212Jamie Iles mtd_device_unregister(slram_mtdlist->mtdinfo); 2351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iounmap(((slram_priv_t *)slram_mtdlist->mtdinfo->priv)->start); 2361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(slram_mtdlist->mtdinfo->priv); 2371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(slram_mtdlist->mtdinfo); 2381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(slram_mtdlist); 2391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds slram_mtdlist = nextitem; 2401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned long handle_unit(unsigned long value, char *unit) 2441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((*unit == 'M') || (*unit == 'm')) { 2461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(value * 1024 * 1024); 2471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if ((*unit == 'K') || (*unit == 'k')) { 2481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(value * 1024); 2491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(value); 2511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int parse_cmdline(char *devname, char *szstart, char *szlength) 2541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *buffer; 2561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long devstart; 2571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long devlength; 258e5580fbe8a950131b9ccccce0f962811dfb9ef43Thomas Gleixner 2591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((!devname) || (!szstart) || (!szlength)) { 2601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unregister_devices(); 2611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(-EINVAL); 2621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds devstart = simple_strtoul(szstart, &buffer, 0); 2651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds devstart = handle_unit(devstart, buffer); 266e5580fbe8a950131b9ccccce0f962811dfb9ef43Thomas Gleixner 2671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (*(szlength) != '+') { 2681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds devlength = simple_strtoul(szlength, &buffer, 0); 2691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds devlength = handle_unit(devlength, buffer) - devstart; 2703afd522de8d8ec446efe957b86e4f63e3dd8ce9dRoel Kluin if (devlength < devstart) 2713afd522de8d8ec446efe957b86e4f63e3dd8ce9dRoel Kluin goto err_out; 2723afd522de8d8ec446efe957b86e4f63e3dd8ce9dRoel Kluin 2733afd522de8d8ec446efe957b86e4f63e3dd8ce9dRoel Kluin devlength -= devstart; 2741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 2751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds devlength = simple_strtoul(szlength + 1, &buffer, 0); 2761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds devlength = handle_unit(devlength, buffer); 2771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds T("slram: devname=%s, devstart=0x%lx, devlength=0x%lx\n", 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds devname, devstart, devlength); 2803afd522de8d8ec446efe957b86e4f63e3dd8ce9dRoel Kluin if (devlength % SLRAM_BLK_SZ != 0) 2813afd522de8d8ec446efe957b86e4f63e3dd8ce9dRoel Kluin goto err_out; 282e5580fbe8a950131b9ccccce0f962811dfb9ef43Thomas Gleixner 2831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((devstart = register_device(devname, devstart, devlength))){ 2841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unregister_devices(); 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return((int)devstart); 2861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(0); 2883afd522de8d8ec446efe957b86e4f63e3dd8ce9dRoel Kluin 2893afd522de8d8ec446efe957b86e4f63e3dd8ce9dRoel Kluinerr_out: 2903afd522de8d8ec446efe957b86e4f63e3dd8ce9dRoel Kluin E("slram: Illegal length parameter.\n"); 2913afd522de8d8ec446efe957b86e4f63e3dd8ce9dRoel Kluin return(-EINVAL); 2921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef MODULE 2951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int __init mtd_slram_setup(char *str) 2971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds map = str; 2991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(1); 3001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds__setup("slram=", mtd_slram_setup); 3031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 3051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 306627df23c61ce28043a0715a941605ab42dfeb05ePeter Huewestatic int __init init_slram(void) 3071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *devname; 3091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i; 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef MODULE 3121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *devstart; 3131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *devlength; 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i = 0; 3161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!map) { 3181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds E("slram: not enough parameters.\n"); 3191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(-EINVAL); 3201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while (map) { 3221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds devname = devstart = devlength = NULL; 3231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(devname = strsep(&map, ","))) { 3251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds E("slram: No devicename specified.\n"); 3261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 3271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds T("slram: devname = %s\n", devname); 3291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((!map) || (!(devstart = strsep(&map, ",")))) { 3301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds E("slram: No devicestart specified.\n"); 3311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds T("slram: devstart = %s\n", devstart); 3331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((!map) || (!(devlength = strsep(&map, ",")))) { 3341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds E("slram: No devicelength / -end specified.\n"); 3351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds T("slram: devlength = %s\n", devlength); 3371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (parse_cmdline(devname, devstart, devlength) != 0) { 3381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(-EINVAL); 3391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int count; 343e5580fbe8a950131b9ccccce0f962811dfb9ef43Thomas Gleixner 344269c0ee66367b11de9758ee64ea039843f0c7cadRoel Kluin for (count = 0; count < SLRAM_MAX_DEVICES_PARAMS && map[count]; 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds count++) { 3461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((count % 3 != 0) || (count == 0)) { 3491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds E("slram: not enough parameters.\n"); 3501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(-EINVAL); 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < (count / 3); i++) { 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds devname = map[i * 3]; 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (parse_cmdline(devname, map[i * 3 + 1], map[i * 3 + 2])!=0) { 3561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(-EINVAL); 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 358e5580fbe8a950131b9ccccce0f962811dfb9ef43Thomas Gleixner 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif /* !MODULE */ 361e5580fbe8a950131b9ccccce0f962811dfb9ef43Thomas Gleixner 3621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return(0); 3631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void __exit cleanup_slram(void) 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unregister_devices(); 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_init(init_slram); 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_exit(cleanup_slram); 3721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_LICENSE("GPL"); 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_AUTHOR("Jochen Schaeuble <psionic@psionic.de>"); 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_DESCRIPTION("MTD driver for uncached system RAM"); 376