patch-2.4.6 linux/drivers/mtd/devices/slram.c
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- Lines: 342
- Date:
Tue Jun 12 10:30:27 2001
- Orig file:
v2.4.5/linux/drivers/mtd/devices/slram.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.5/linux/drivers/mtd/devices/slram.c linux/drivers/mtd/devices/slram.c
@@ -0,0 +1,341 @@
+/*======================================================================
+
+ $Id: slram.c,v 1.19 2001/06/02 20:33:20 dwmw2 Exp $
+
+======================================================================*/
+
+
+#include <linux/module.h>
+#include <asm/uaccess.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/major.h>
+#include <linux/fs.h>
+#include <linux/ioctl.h>
+#include <linux/init.h>
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/segment.h>
+#include <stdarg.h>
+
+#include <linux/mtd/mtd.h>
+
+#define SLRAM_MAX_DEVICES_PARAMS 6 /* 3 parameters / device */
+
+#define T(fmt, args...) printk(KERN_DEBUG fmt, ## args)
+#define E(fmt, args...) printk(KERN_NOTICE fmt, ## args)
+
+typedef struct slram_priv {
+ u_char *start;
+ u_char *end;
+} slram_priv_t;
+
+typedef struct slram_mtd_list {
+ struct mtd_info *mtdinfo;
+ struct slram_mtd_list *next;
+} slram_mtd_list_t;
+
+#ifdef MODULE
+static char *map[SLRAM_MAX_DEVICES_PARAMS];
+#else
+static char *map;
+#endif
+
+#ifdef MODULE
+#if LINUX_VERSION_CODE < 0x20212
+#define init_slram init_module
+#define cleanup_slram cleanup_module
+#endif
+
+MODULE_PARM(map, "3-" __MODULE_STRING(SLRAM_MAX_DEVICES_PARAMS) "s");
+MODULE_PARM_DESC(map, "List of memory regions to map. \"map=<name>, <start>, <length / end>\"");
+#endif
+
+static slram_mtd_list_t *slram_mtdlist = NULL;
+
+int slram_erase(struct mtd_info *, struct erase_info *);
+int slram_point(struct mtd_info *, loff_t, size_t, size_t *, u_char **);
+void slram_unpoint(struct mtd_info *, u_char *);
+int slram_read(struct mtd_info *, loff_t, size_t, size_t *, u_char *);
+int slram_write(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
+
+int slram_erase(struct mtd_info *mtd, struct erase_info *instr)
+{
+ slram_priv_t *priv = mtd->priv;
+
+ if (instr->addr + instr->len > mtd->size) {
+ return(-EINVAL);
+ }
+
+ memset(priv->start + instr->addr, 0xff, instr->len);
+
+ /* This'll catch a few races. Free the thing before returning :)
+ * I don't feel at all ashamed. This kind of thing is possible anyway
+ * with flash, but unlikely.
+ */
+
+ instr->state = MTD_ERASE_DONE;
+
+ if (instr->callback) {
+ (*(instr->callback))(instr);
+ }
+ else {
+ kfree(instr);
+ }
+
+ return(0);
+}
+
+int slram_point(struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, u_char **mtdbuf)
+{
+ slram_priv_t *priv = (slram_priv_t *)mtd->priv;
+
+ *mtdbuf = priv->start + from;
+ *retlen = len;
+ return(0);
+}
+
+void slram_unpoint(struct mtd_info *mtd, u_char *addr)
+{
+}
+
+int slram_read(struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ slram_priv_t *priv = (slram_priv_t *)mtd->priv;
+
+ memcpy(buf, priv->start + from, len);
+
+ *retlen = len;
+ return(0);
+}
+
+int slram_write(struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf)
+{
+ slram_priv_t *priv = (slram_priv_t *)mtd->priv;
+
+ memcpy(priv->start + to, buf, len);
+
+ *retlen = len;
+ return(0);
+}
+
+/*====================================================================*/
+
+int register_device(char *name, long start, long length)
+{
+ slram_mtd_list_t **curmtd;
+
+ curmtd = &slram_mtdlist;
+ while (*curmtd) {
+ curmtd = &(*curmtd)->next;
+ }
+
+ *curmtd = kmalloc(sizeof(slram_mtd_list_t), GFP_KERNEL);
+ if (!curmtd) {
+ E("slram: Cannot allocate new MTD device.\n");
+ return(-ENOMEM);
+ }
+ (*curmtd)->mtdinfo = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
+ (*curmtd)->next = NULL;
+
+ if ((*curmtd)->mtdinfo) {
+ memset((char *)(*curmtd)->mtdinfo, 0, sizeof(struct mtd_info));
+ (*curmtd)->mtdinfo->priv =
+ (void *)kmalloc(sizeof(slram_priv_t), GFP_KERNEL);
+
+ if (!(*curmtd)->mtdinfo->priv) {
+ kfree((*curmtd)->mtdinfo);
+ (*curmtd)->mtdinfo = NULL;
+ } else {
+ memset((*curmtd)->mtdinfo->priv,0,sizeof(slram_priv_t));
+ }
+ }
+
+ if (!(*curmtd)->mtdinfo) {
+ E("slram: Cannot allocate new MTD device.\n");
+ return(-ENOMEM);
+ }
+
+ if (!(((slram_priv_t *)(*curmtd)->mtdinfo->priv)->start =
+ ioremap(start, length))) {
+ E("slram: ioremap failed\n");
+ return -EIO;
+ }
+ ((slram_priv_t *)(*curmtd)->mtdinfo->priv)->end =
+ ((slram_priv_t *)(*curmtd)->mtdinfo->priv)->start + length;
+
+
+ (*curmtd)->mtdinfo->name = name;
+ (*curmtd)->mtdinfo->size = length;
+ (*curmtd)->mtdinfo->flags = MTD_CLEAR_BITS | MTD_SET_BITS |
+ MTD_WRITEB_WRITEABLE | MTD_VOLATILE;
+ (*curmtd)->mtdinfo->erase = slram_erase;
+ (*curmtd)->mtdinfo->point = slram_point;
+ (*curmtd)->mtdinfo->unpoint = slram_unpoint;
+ (*curmtd)->mtdinfo->read = slram_read;
+ (*curmtd)->mtdinfo->write = slram_write;
+ (*curmtd)->mtdinfo->module = THIS_MODULE;
+ (*curmtd)->mtdinfo->type = MTD_RAM;
+ (*curmtd)->mtdinfo->erasesize = 0x10000;
+
+ if (add_mtd_device((*curmtd)->mtdinfo)) {
+ E("slram: Failed to register new device\n");
+ iounmap(((slram_priv_t *)(*curmtd)->mtdinfo->priv)->start);
+ kfree((*curmtd)->mtdinfo->priv);
+ kfree((*curmtd)->mtdinfo);
+ return(-EAGAIN);
+ }
+ T("slram: Registered device %s from %dKiB to %dKiB\n", name,
+ (int)(start / 1024), (int)((start + length) / 1024));
+ T("slram: Mapped from 0x%p to 0x%p\n",
+ ((slram_priv_t *)(*curmtd)->mtdinfo->priv)->start,
+ ((slram_priv_t *)(*curmtd)->mtdinfo->priv)->end);
+ return(0);
+}
+
+void unregister_devices(void)
+{
+ slram_mtd_list_t *nextitem;
+
+ while (slram_mtdlist) {
+ nextitem = slram_mtdlist->next;
+ del_mtd_device(slram_mtdlist->mtdinfo);
+ iounmap(((slram_priv_t *)slram_mtdlist->mtdinfo->priv)->start);
+ kfree(slram_mtdlist->mtdinfo->priv);
+ kfree(slram_mtdlist->mtdinfo);
+ kfree(slram_mtdlist);
+ slram_mtdlist = nextitem;
+ }
+}
+
+int handle_unit(long value, char *unit)
+{
+ if ((*unit == 'M') || (*unit == 'm')) {
+ return(value * 1024 * 1024);
+ } else if ((*unit == 'K') || (*unit == 'k')) {
+ return(value * 1024);
+ }
+ return(value);
+}
+
+int parse_cmdline(char *devname, char *szstart, char *szlength)
+{
+ char *buffer;
+ long devstart;
+ long devlength;
+
+ if ((!devname) || (!szstart) || (!szlength)) {
+ unregister_devices();
+ return(-EINVAL);
+ }
+
+ devstart = simple_strtoul(szstart, &buffer, 0);
+ devstart = handle_unit(devstart, buffer);
+
+ if (*(szlength) != '+') {
+ devlength = simple_strtoul(szlength, &buffer, 0);
+ devlength = handle_unit(devlength, buffer) - devstart;
+ } else {
+ devlength = simple_strtoul(szlength + 1, &buffer, 0);
+ devlength = handle_unit(devlength, buffer);
+ }
+ T("slram: devname=%s, devstart=%li, devlength=%li\n",
+ devname, devstart, devlength);
+ if ((devstart < 0) || (devlength < 0)) {
+ E("slram: Illegal start / length parameter.\n");
+ return(-EINVAL);
+ }
+
+ if ((devstart = register_device(devname, devstart, devlength))){
+ unregister_devices();
+ return((int)devstart);
+ }
+ return(0);
+}
+
+#ifndef MODULE
+
+static int __init mtd_slram_setup(char *str)
+{
+ map = str;
+ return(1);
+}
+
+__setup("slram=", mtd_slram_setup);
+
+#endif
+
+int init_slram(void)
+{
+ char *devname;
+ int i;
+
+#ifndef MODULE
+ char *devstart;
+ char *devlength;
+
+ i = 0;
+
+ if (!map) {
+ E("slram: not enough parameters.\n");
+ return(-EINVAL);
+ }
+ while (map) {
+ devname = devstart = devlength = NULL;
+
+ if (!(devname = strsep(&map, ","))) {
+ E("slram: No devicename specified.\n");
+ break;
+ }
+ T("slram: devname = %s\n", devname);
+ if ((!map) || (!(devstart = strsep(&map, ",")))) {
+ E("slram: No devicestart specified.\n");
+ }
+ T("slram: devstart = %s\n", devstart);
+ if ((!map) || (!(devlength = strsep(&map, ",")))) {
+ E("slram: No devicelength / -end specified.\n");
+ }
+ T("slram: devlength = %s\n", devlength);
+ if (parse_cmdline(devname, devstart, devlength) != 0) {
+ return(-EINVAL);
+ }
+ }
+#else
+ int count;
+
+ for (count = 0; (map[count]) && (count < SLRAM_MAX_DEVICES_PARAMS);
+ count++) {
+ }
+
+ if ((count % 3 != 0) || (count == 0)) {
+ E("slram: not enough parameters.\n");
+ return(-EINVAL);
+ }
+ for (i = 0; i < (count / 3); i++) {
+ devname = map[i * 3];
+
+ if (parse_cmdline(devname, map[i * 3 + 1], map[i * 3 + 2])!=0) {
+ return(-EINVAL);
+ }
+
+ }
+#endif /* !MODULE */
+
+ return(0);
+}
+
+static void __exit cleanup_slram(void)
+{
+ unregister_devices();
+}
+
+module_init(init_slram);
+module_exit(cleanup_slram);
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