[mirror_ubuntu-jammy-kernel.git] / drivers / mtd / devices / slram.c

/*======================================================================

  $Id: slram.c,v 1.36 2005/11/07 11:14:25 gleixner Exp $

  This driver provides a method to access memory not used by the kernel
  itself (i.e. if the kernel commandline mem=xxx is used). To actually
  use slram at least mtdblock or mtdchar is required (for block or
  character device access).

  Usage:

  if compiled as loadable module:
    modprobe slram map=<name>,<start>,<end/offset>
  if statically linked into the kernel use the following kernel cmd.line
    slram=<name>,<start>,<end/offset>

  <name>: name of the device that will be listed in /proc/mtd
  <start>: start of the memory region, decimal or hex (0xabcdef)
  <end/offset>: end of the memory region. It's possible to use +0x1234
                to specify the offset instead of the absolute address

  NOTE:
  With slram it's only possible to map a contigous memory region. Therfore
  if there's a device mapped somewhere in the region specified slram will
  fail to load (see kernel log if modprobe fails).

  -

  Jochen Schaeuble <psionic@psionic.de>

======================================================================*/


#include <linux/module.h>
#include <asm/uaccess.h>
#include <linux/types.h>
#include <linux/kernel.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 <linux/mtd/mtd.h>

#define SLRAM_MAX_DEVICES_PARAMS 6		/* 3 parameters / device */
#define SLRAM_BLK_SZ 0x4000

#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];

module_param_array(map, charp, NULL, 0);
MODULE_PARM_DESC(map, "List of memory regions to map. \"map=<name>, <start>, <length / end>\"");
#else
static char *map;
#endif

static slram_mtd_list_t *slram_mtdlist = NULL;

static int slram_erase(struct mtd_info *, struct erase_info *);
static int slram_point(struct mtd_info *, loff_t, size_t, size_t *, void **,
		resource_size_t *);
static void slram_unpoint(struct mtd_info *, loff_t, size_t);
static int slram_read(struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int slram_write(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);

static 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;

	mtd_erase_callback(instr);

	return(0);
}

static int slram_point(struct mtd_info *mtd, loff_t from, size_t len,
		size_t *retlen, void **virt, resource_size_t *phys)
{
	slram_priv_t *priv = mtd->priv;

	/* can we return a physical address with this driver? */
	if (phys)
		return -EINVAL;

	if (from + len > mtd->size)
		return -EINVAL;

	*virt = priv->start + from;
	*retlen = len;
	return(0);
}

static void slram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
{
}

static int slram_read(struct mtd_info *mtd, loff_t from, size_t len,
		size_t *retlen, u_char *buf)
{
	slram_priv_t *priv = mtd->priv;

	if (from > mtd->size)
		return -EINVAL;

	if (from + len > mtd->size)
		len = mtd->size - from;

	memcpy(buf, priv->start + from, len);

	*retlen = len;
	return(0);
}

static int slram_write(struct mtd_info *mtd, loff_t to, size_t len,
		size_t *retlen, const u_char *buf)
{
	slram_priv_t *priv = mtd->priv;

	if (to + len > mtd->size)
		return -EINVAL;

	memcpy(priv->start + to, buf, len);

	*retlen = len;
	return(0);
}

/*====================================================================*/

static int register_device(char *name, unsigned long start, unsigned 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 = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
	(*curmtd)->next = NULL;

	if ((*curmtd)->mtdinfo)	{
		(*curmtd)->mtdinfo->priv =
			kzalloc(sizeof(slram_priv_t), GFP_KERNEL);

		if (!(*curmtd)->mtdinfo->priv) {
			kfree((*curmtd)->mtdinfo);
			(*curmtd)->mtdinfo = NULL;
		}
	}

	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_CAP_RAM;
        (*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->owner = THIS_MODULE;
	(*curmtd)->mtdinfo->type = MTD_RAM;
	(*curmtd)->mtdinfo->erasesize = SLRAM_BLK_SZ;
	(*curmtd)->mtdinfo->writesize = 1;

	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 %luKiB to %luKiB\n", name,
			(start / 1024), ((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);
}

static 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;
	}
}

static unsigned long handle_unit(unsigned long value, char *unit)
{
	if ((*unit == 'M') || (*unit == 'm')) {
		return(value * 1024 * 1024);
	} else if ((*unit == 'K') || (*unit == 'k')) {
		return(value * 1024);
	}
	return(value);
}

static int parse_cmdline(char *devname, char *szstart, char *szlength)
{
	char *buffer;
	unsigned long devstart;
	unsigned 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=0x%lx, devlength=0x%lx\n",
			devname, devstart, devlength);
	if ((devstart < 0) || (devlength < 0) || (devlength % SLRAM_BLK_SZ != 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

static 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);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jochen Schaeuble <psionic@psionic.de>");
MODULE_DESCRIPTION("MTD driver for uncached system RAM");
Commit	Line	Data
1da177e4 LT	1	/*======================================================================
1da177e4 LT	2
e5580fbe	3	$Id: slram.c,v 1.36 2005/11/07 11:14:25 gleixner Exp $
1da177e4 LT	4
	5	This driver provides a method to access memory not used by the kernel
	6	itself (i.e. if the kernel commandline mem=xxx is used). To actually
	7	use slram at least mtdblock or mtdchar is required (for block or
	8	character device access).
	9
	10	Usage:
	11
	12	if compiled as loadable module:
	13	modprobe slram map=<name>,<start>,<end/offset>
	14	if statically linked into the kernel use the following kernel cmd.line
	15	slram=<name>,<start>,<end/offset>
	16
	17	<name>: name of the device that will be listed in /proc/mtd
	18	<start>: start of the memory region, decimal or hex (0xabcdef)
	19	<end/offset>: end of the memory region. It's possible to use +0x1234
	20	to specify the offset instead of the absolute address
e5580fbe	21
1da177e4 LT	22	NOTE:
	23	With slram it's only possible to map a contigous memory region. Therfore
	24	if there's a device mapped somewhere in the region specified slram will
	25	fail to load (see kernel log if modprobe fails).
	26
	27	-
e5580fbe	28
1da177e4 LT	29	Jochen Schaeuble <psionic@psionic.de>
	30
	31	======================================================================*/
	32
	33
	34	#include <linux/module.h>
	35	#include <asm/uaccess.h>
	36	#include <linux/types.h>
	37	#include <linux/kernel.h>
1da177e4 LT	38	#include <linux/ptrace.h>
	39	#include <linux/slab.h>
	40	#include <linux/string.h>
	41	#include <linux/timer.h>
	42	#include <linux/major.h>
	43	#include <linux/fs.h>
	44	#include <linux/ioctl.h>
	45	#include <linux/init.h>
	46	#include <asm/io.h>
	47	#include <asm/system.h>
	48
	49	#include <linux/mtd/mtd.h>
	50
	51	#define SLRAM_MAX_DEVICES_PARAMS 6 /* 3 parameters / device */
14f8351a	52	#define SLRAM_BLK_SZ 0x4000
1da177e4 LT	53
	54	#define T(fmt, args...) printk(KERN_DEBUG fmt, ## args)
	55	#define E(fmt, args...) printk(KERN_NOTICE fmt, ## args)
	56
	57	typedef struct slram_priv {
	58	u_char *start;
	59	u_char *end;
	60	} slram_priv_t;
	61
	62	typedef struct slram_mtd_list {
	63	struct mtd_info *mtdinfo;
	64	struct slram_mtd_list *next;
	65	} slram_mtd_list_t;
	66
	67	#ifdef MODULE
	68	static char *map[SLRAM_MAX_DEVICES_PARAMS];
	69
	70	module_param_array(map, charp, NULL, 0);
	71	MODULE_PARM_DESC(map, "List of memory regions to map. \"map=<name>, <start>, <length / end>\"");
	72	#else
	73	static char *map;
	74	#endif
	75
	76	static slram_mtd_list_t *slram_mtdlist = NULL;
	77
	78	static int slram_erase(struct mtd_info , struct erase_info );
a98889f3 JH	79	static int slram_point(struct mtd_info , loff_t, size_t, size_t , void **,
	80	resource_size_t *);
	81	static void slram_unpoint(struct mtd_info *, loff_t, size_t);
1da177e4 LT	82	static int slram_read(struct mtd_info , loff_t, size_t, size_t , u_char *);
	83	static int slram_write(struct mtd_info , loff_t, size_t, size_t , const u_char *);
	84
	85	static int slram_erase(struct mtd_info mtd, struct erase_info instr)
	86	{
	87	slram_priv_t *priv = mtd->priv;
	88
	89	if (instr->addr + instr->len > mtd->size) {
	90	return(-EINVAL);
	91	}
e5580fbe	92
1da177e4 LT	93	memset(priv->start + instr->addr, 0xff, instr->len);
1da177e4 LT	94
e5580fbe	95	/* This'll catch a few races. Free the thing before returning :)
1da177e4 LT	96	* I don't feel at all ashamed. This kind of thing is possible anyway
	97	* with flash, but unlikely.
	98	*/
	99
	100	instr->state = MTD_ERASE_DONE;
	101
	102	mtd_erase_callback(instr);
	103
	104	return(0);
	105	}
	106
	107	static int slram_point(struct mtd_info *mtd, loff_t from, size_t len,
a98889f3	108	size_t retlen, void virt, resource_size_t phys)
1da177e4 LT	109	{
	110	slram_priv_t *priv = mtd->priv;
	111
a98889f3 JH	112	/* can we return a physical address with this driver? */
	113	if (phys)
	114	return -EINVAL;
	115
14f8351a JB	116	if (from + len > mtd->size)
	117	return -EINVAL;
	118
a98889f3	119	*virt = priv->start + from;
1da177e4 LT	120	*retlen = len;
	121	return(0);
	122	}
	123
a98889f3	124	static void slram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
1da177e4 LT	125	{
	126	}
	127
	128	static int slram_read(struct mtd_info *mtd, loff_t from, size_t len,
	129	size_t retlen, u_char buf)
	130	{
	131	slram_priv_t *priv = mtd->priv;
14f8351a JB	132
	133	if (from > mtd->size)
	134	return -EINVAL;
	135
	136	if (from + len > mtd->size)
	137	len = mtd->size - from;
	138
1da177e4 LT	139	memcpy(buf, priv->start + from, len);
	140
	141	*retlen = len;
	142	return(0);
	143	}
	144
	145	static int slram_write(struct mtd_info *mtd, loff_t to, size_t len,
	146	size_t retlen, const u_char buf)
	147	{
	148	slram_priv_t *priv = mtd->priv;
	149
14f8351a JB	150	if (to + len > mtd->size)
	151	return -EINVAL;
	152
1da177e4 LT	153	memcpy(priv->start + to, buf, len);
	154
	155	*retlen = len;
	156	return(0);
	157	}
	158
	159	/====================================================================/
	160
	161	static int register_device(char *name, unsigned long start, unsigned long length)
	162	{
	163	slram_mtd_list_t **curmtd;
	164
	165	curmtd = &slram_mtdlist;
	166	while (*curmtd) {
	167	curmtd = &(*curmtd)->next;
	168	}
	169
	170	*curmtd = kmalloc(sizeof(slram_mtd_list_t), GFP_KERNEL);
	171	if (!(*curmtd)) {
	172	E("slram: Cannot allocate new MTD device.\n");
	173	return(-ENOMEM);
	174	}
95b93a0c	175	(*curmtd)->mtdinfo = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
1da177e4	176	(*curmtd)->next = NULL;
e5580fbe	177
1da177e4	178	if ((*curmtd)->mtdinfo) {
1da177e4	179	(*curmtd)->mtdinfo->priv =
95b93a0c	180	kzalloc(sizeof(slram_priv_t), GFP_KERNEL);
e5580fbe	181
1da177e4 LT	182	if (!(*curmtd)->mtdinfo->priv) {
	183	kfree((*curmtd)->mtdinfo);
	184	(*curmtd)->mtdinfo = NULL;
1da177e4 LT	185	}
	186	}
	187
	188	if (!(*curmtd)->mtdinfo) {
	189	E("slram: Cannot allocate new MTD device.\n");
	190	return(-ENOMEM);
	191	}
e5580fbe	192
1da177e4 LT	193	if (!(((slram_priv_t )(curmtd)->mtdinfo->priv)->start =
	194	ioremap(start, length))) {
	195	E("slram: ioremap failed\n");
	196	return -EIO;
	197	}
	198	((slram_priv_t )(curmtd)->mtdinfo->priv)->end =
	199	((slram_priv_t )(curmtd)->mtdinfo->priv)->start + length;
	200
	201
	202	(*curmtd)->mtdinfo->name = name;
	203	(*curmtd)->mtdinfo->size = length;
a6c591ed	204	(*curmtd)->mtdinfo->flags = MTD_CAP_RAM;
1da177e4 LT	205	(*curmtd)->mtdinfo->erase = slram_erase;
	206	(*curmtd)->mtdinfo->point = slram_point;
	207	(*curmtd)->mtdinfo->unpoint = slram_unpoint;
	208	(*curmtd)->mtdinfo->read = slram_read;
	209	(*curmtd)->mtdinfo->write = slram_write;
	210	(*curmtd)->mtdinfo->owner = THIS_MODULE;
21c8db9e	211	(*curmtd)->mtdinfo->type = MTD_RAM;
14f8351a	212	(*curmtd)->mtdinfo->erasesize = SLRAM_BLK_SZ;
17ffc7ba	213	(*curmtd)->mtdinfo->writesize = 1;
1da177e4 LT	214
	215	if (add_mtd_device((*curmtd)->mtdinfo)) {
	216	E("slram: Failed to register new device\n");
	217	iounmap(((slram_priv_t )(curmtd)->mtdinfo->priv)->start);
	218	kfree((*curmtd)->mtdinfo->priv);
	219	kfree((*curmtd)->mtdinfo);
	220	return(-EAGAIN);
	221	}
	222	T("slram: Registered device %s from %luKiB to %luKiB\n", name,
	223	(start / 1024), ((start + length) / 1024));
	224	T("slram: Mapped from 0x%p to 0x%p\n",
	225	((slram_priv_t )(curmtd)->mtdinfo->priv)->start,
	226	((slram_priv_t )(curmtd)->mtdinfo->priv)->end);
e5580fbe	227	return(0);
1da177e4 LT	228	}
	229
	230	static void unregister_devices(void)
	231	{
	232	slram_mtd_list_t *nextitem;
	233
	234	while (slram_mtdlist) {
	235	nextitem = slram_mtdlist->next;
	236	del_mtd_device(slram_mtdlist->mtdinfo);
	237	iounmap(((slram_priv_t *)slram_mtdlist->mtdinfo->priv)->start);
	238	kfree(slram_mtdlist->mtdinfo->priv);
	239	kfree(slram_mtdlist->mtdinfo);
	240	kfree(slram_mtdlist);
	241	slram_mtdlist = nextitem;
	242	}
	243	}
	244
	245	static unsigned long handle_unit(unsigned long value, char *unit)
	246	{
	247	if ((unit == 'M') \|\| (unit == 'm')) {
	248	return(value * 1024 * 1024);
	249	} else if ((unit == 'K') \|\| (unit == 'k')) {
	250	return(value * 1024);
	251	}
	252	return(value);
	253	}
	254
	255	static int parse_cmdline(char devname, char szstart, char *szlength)
	256	{
	257	char *buffer;
	258	unsigned long devstart;
	259	unsigned long devlength;
e5580fbe	260
1da177e4 LT	261	if ((!devname) \|\| (!szstart) \|\| (!szlength)) {
	262	unregister_devices();
	263	return(-EINVAL);
	264	}
	265
	266	devstart = simple_strtoul(szstart, &buffer, 0);
	267	devstart = handle_unit(devstart, buffer);
e5580fbe	268
1da177e4 LT	269	if (*(szlength) != '+') {
	270	devlength = simple_strtoul(szlength, &buffer, 0);
	271	devlength = handle_unit(devlength, buffer) - devstart;
	272	} else {
	273	devlength = simple_strtoul(szlength + 1, &buffer, 0);
	274	devlength = handle_unit(devlength, buffer);
	275	}
	276	T("slram: devname=%s, devstart=0x%lx, devlength=0x%lx\n",
	277	devname, devstart, devlength);
14f8351a	278	if ((devstart < 0) \|\| (devlength < 0) \|\| (devlength % SLRAM_BLK_SZ != 0)) {
1da177e4 LT	279	E("slram: Illegal start / length parameter.\n");
	280	return(-EINVAL);
	281	}
e5580fbe	282
1da177e4 LT	283	if ((devstart = register_device(devname, devstart, devlength))){
	284	unregister_devices();
	285	return((int)devstart);
	286	}
	287	return(0);
	288	}
	289
	290	#ifndef MODULE
	291
	292	static int __init mtd_slram_setup(char *str)
	293	{
	294	map = str;
	295	return(1);
	296	}
	297
	298	__setup("slram=", mtd_slram_setup);
	299
	300	#endif
	301
	302	static int init_slram(void)
	303	{
	304	char *devname;
	305	int i;
	306
	307	#ifndef MODULE
	308	char *devstart;
	309	char *devlength;
	310
	311	i = 0;
	312
	313	if (!map) {
	314	E("slram: not enough parameters.\n");
	315	return(-EINVAL);
	316	}
	317	while (map) {
	318	devname = devstart = devlength = NULL;
	319
	320	if (!(devname = strsep(&map, ","))) {
	321	E("slram: No devicename specified.\n");
	322	break;
	323	}
	324	T("slram: devname = %s\n", devname);
	325	if ((!map) \|\| (!(devstart = strsep(&map, ",")))) {
	326	E("slram: No devicestart specified.\n");
	327	}
	328	T("slram: devstart = %s\n", devstart);
	329	if ((!map) \|\| (!(devlength = strsep(&map, ",")))) {
	330	E("slram: No devicelength / -end specified.\n");
	331	}
	332	T("slram: devlength = %s\n", devlength);
	333	if (parse_cmdline(devname, devstart, devlength) != 0) {
	334	return(-EINVAL);
	335	}
	336	}
	337	#else
	338	int count;
e5580fbe	339
1da177e4 LT	340	for (count = 0; (map[count]) && (count < SLRAM_MAX_DEVICES_PARAMS);
	341	count++) {
	342	}
	343
	344	if ((count % 3 != 0) \|\| (count == 0)) {
	345	E("slram: not enough parameters.\n");
	346	return(-EINVAL);
	347	}
	348	for (i = 0; i < (count / 3); i++) {
	349	devname = map[i * 3];
	350
	351	if (parse_cmdline(devname, map[i * 3 + 1], map[i * 3 + 2])!=0) {
	352	return(-EINVAL);
	353	}
e5580fbe	354
1da177e4 LT	355	}
1da177e4 LT	356	#endif /* !MODULE */
e5580fbe	357
1da177e4 LT	358	return(0);
	359	}
	360
	361	static void __exit cleanup_slram(void)
	362	{
	363	unregister_devices();
	364	}
	365
	366	module_init(init_slram);
	367	module_exit(cleanup_slram);
	368
	369	MODULE_LICENSE("GPL");
	370	MODULE_AUTHOR("Jochen Schaeuble <psionic@psionic.de>");
	371	MODULE_DESCRIPTION("MTD driver for uncached system RAM");