[linux-block.git] / drivers / mtd / devices / slram.c

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

  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;
		if (devlength < devstart)
			goto err_out;

		devlength -= 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 (devlength % SLRAM_BLK_SZ != 0)
		goto err_out;

	if ((devstart = register_device(devname, devstart, devlength))){
		unregister_devices();
		return((int)devstart);
	}
	return(0);

err_out:
	E("slram: Illegal length parameter.\n");
	return(-EINVAL);
}

#ifndef MODULE

static int __init mtd_slram_setup(char *str)
{
	map = str;
	return(1);
}

__setup("slram=", mtd_slram_setup);

#endif

static int __init 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; count < SLRAM_MAX_DEVICES_PARAMS && map[count];
			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
1da177e4 LT	3	This driver provides a method to access memory not used by the kernel
	4	itself (i.e. if the kernel commandline mem=xxx is used). To actually
	5	use slram at least mtdblock or mtdchar is required (for block or
	6	character device access).
	7
	8	Usage:
	9
	10	if compiled as loadable module:
	11	modprobe slram map=<name>,<start>,<end/offset>
	12	if statically linked into the kernel use the following kernel cmd.line
	13	slram=<name>,<start>,<end/offset>
	14
	15	<name>: name of the device that will be listed in /proc/mtd
	16	<start>: start of the memory region, decimal or hex (0xabcdef)
	17	<end/offset>: end of the memory region. It's possible to use +0x1234
	18	to specify the offset instead of the absolute address
e5580fbe	19
1da177e4 LT	20	NOTE:
	21	With slram it's only possible to map a contigous memory region. Therfore
	22	if there's a device mapped somewhere in the region specified slram will
	23	fail to load (see kernel log if modprobe fails).
	24
	25	-
e5580fbe	26
1da177e4 LT	27	Jochen Schaeuble <psionic@psionic.de>
	28
	29	======================================================================*/
	30
	31
	32	#include <linux/module.h>
	33	#include <asm/uaccess.h>
	34	#include <linux/types.h>
	35	#include <linux/kernel.h>
1da177e4 LT	36	#include <linux/ptrace.h>
	37	#include <linux/slab.h>
	38	#include <linux/string.h>
	39	#include <linux/timer.h>
	40	#include <linux/major.h>
	41	#include <linux/fs.h>
	42	#include <linux/ioctl.h>
	43	#include <linux/init.h>
	44	#include <asm/io.h>
	45	#include <asm/system.h>
	46
	47	#include <linux/mtd/mtd.h>
	48
	49	#define SLRAM_MAX_DEVICES_PARAMS 6 /* 3 parameters / device */
14f8351a	50	#define SLRAM_BLK_SZ 0x4000
1da177e4 LT	51
	52	#define T(fmt, args...) printk(KERN_DEBUG fmt, ## args)
	53	#define E(fmt, args...) printk(KERN_NOTICE fmt, ## args)
	54
	55	typedef struct slram_priv {
	56	u_char *start;
	57	u_char *end;
	58	} slram_priv_t;
	59
	60	typedef struct slram_mtd_list {
	61	struct mtd_info *mtdinfo;
	62	struct slram_mtd_list *next;
	63	} slram_mtd_list_t;
	64
	65	#ifdef MODULE
	66	static char *map[SLRAM_MAX_DEVICES_PARAMS];
	67
	68	module_param_array(map, charp, NULL, 0);
	69	MODULE_PARM_DESC(map, "List of memory regions to map. \"map=<name>, <start>, <length / end>\"");
	70	#else
	71	static char *map;
	72	#endif
	73
	74	static slram_mtd_list_t *slram_mtdlist = NULL;
	75
	76	static int slram_erase(struct mtd_info , struct erase_info );
a98889f3 JH	77	static int slram_point(struct mtd_info , loff_t, size_t, size_t , void **,
	78	resource_size_t *);
	79	static void slram_unpoint(struct mtd_info *, loff_t, size_t);
1da177e4 LT	80	static int slram_read(struct mtd_info , loff_t, size_t, size_t , u_char *);
	81	static int slram_write(struct mtd_info , loff_t, size_t, size_t , const u_char *);
	82
	83	static int slram_erase(struct mtd_info mtd, struct erase_info instr)
	84	{
	85	slram_priv_t *priv = mtd->priv;
	86
	87	if (instr->addr + instr->len > mtd->size) {
	88	return(-EINVAL);
	89	}
e5580fbe	90
1da177e4 LT	91	memset(priv->start + instr->addr, 0xff, instr->len);
1da177e4 LT	92
e5580fbe	93	/* This'll catch a few races. Free the thing before returning :)
1da177e4 LT	94	* I don't feel at all ashamed. This kind of thing is possible anyway
	95	* with flash, but unlikely.
	96	*/
	97
	98	instr->state = MTD_ERASE_DONE;
	99
	100	mtd_erase_callback(instr);
	101
	102	return(0);
	103	}
	104
	105	static int slram_point(struct mtd_info *mtd, loff_t from, size_t len,
a98889f3	106	size_t retlen, void virt, resource_size_t phys)
1da177e4 LT	107	{
	108	slram_priv_t *priv = mtd->priv;
	109
a98889f3 JH	110	/* can we return a physical address with this driver? */
	111	if (phys)
	112	return -EINVAL;
	113
14f8351a JB	114	if (from + len > mtd->size)
	115	return -EINVAL;
	116
a98889f3	117	*virt = priv->start + from;
1da177e4 LT	118	*retlen = len;
	119	return(0);
	120	}
	121
a98889f3	122	static void slram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
1da177e4 LT	123	{
	124	}
	125
	126	static int slram_read(struct mtd_info *mtd, loff_t from, size_t len,
	127	size_t retlen, u_char buf)
	128	{
	129	slram_priv_t *priv = mtd->priv;
14f8351a JB	130
	131	if (from > mtd->size)
	132	return -EINVAL;
	133
	134	if (from + len > mtd->size)
	135	len = mtd->size - from;
	136
1da177e4 LT	137	memcpy(buf, priv->start + from, len);
	138
	139	*retlen = len;
	140	return(0);
	141	}
	142
	143	static int slram_write(struct mtd_info *mtd, loff_t to, size_t len,
	144	size_t retlen, const u_char buf)
	145	{
	146	slram_priv_t *priv = mtd->priv;
	147
14f8351a JB	148	if (to + len > mtd->size)
	149	return -EINVAL;
	150
1da177e4 LT	151	memcpy(priv->start + to, buf, len);
	152
	153	*retlen = len;
	154	return(0);
	155	}
	156
	157	/====================================================================/
	158
	159	static int register_device(char *name, unsigned long start, unsigned long length)
	160	{
	161	slram_mtd_list_t **curmtd;
	162
	163	curmtd = &slram_mtdlist;
	164	while (*curmtd) {
	165	curmtd = &(*curmtd)->next;
	166	}
	167
	168	*curmtd = kmalloc(sizeof(slram_mtd_list_t), GFP_KERNEL);
	169	if (!(*curmtd)) {
	170	E("slram: Cannot allocate new MTD device.\n");
	171	return(-ENOMEM);
	172	}
95b93a0c	173	(*curmtd)->mtdinfo = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
1da177e4	174	(*curmtd)->next = NULL;
e5580fbe	175
1da177e4	176	if ((*curmtd)->mtdinfo) {
1da177e4	177	(*curmtd)->mtdinfo->priv =
95b93a0c	178	kzalloc(sizeof(slram_priv_t), GFP_KERNEL);
e5580fbe	179
1da177e4 LT	180	if (!(*curmtd)->mtdinfo->priv) {
	181	kfree((*curmtd)->mtdinfo);
	182	(*curmtd)->mtdinfo = NULL;
1da177e4 LT	183	}
	184	}
	185
	186	if (!(*curmtd)->mtdinfo) {
	187	E("slram: Cannot allocate new MTD device.\n");
	188	return(-ENOMEM);
	189	}
e5580fbe	190
1da177e4 LT	191	if (!(((slram_priv_t )(curmtd)->mtdinfo->priv)->start =
	192	ioremap(start, length))) {
	193	E("slram: ioremap failed\n");
	194	return -EIO;
	195	}
	196	((slram_priv_t )(curmtd)->mtdinfo->priv)->end =
	197	((slram_priv_t )(curmtd)->mtdinfo->priv)->start + length;
	198
	199
	200	(*curmtd)->mtdinfo->name = name;
	201	(*curmtd)->mtdinfo->size = length;
a6c591ed	202	(*curmtd)->mtdinfo->flags = MTD_CAP_RAM;
1da177e4 LT	203	(*curmtd)->mtdinfo->erase = slram_erase;
	204	(*curmtd)->mtdinfo->point = slram_point;
	205	(*curmtd)->mtdinfo->unpoint = slram_unpoint;
	206	(*curmtd)->mtdinfo->read = slram_read;
	207	(*curmtd)->mtdinfo->write = slram_write;
	208	(*curmtd)->mtdinfo->owner = THIS_MODULE;
21c8db9e	209	(*curmtd)->mtdinfo->type = MTD_RAM;
14f8351a	210	(*curmtd)->mtdinfo->erasesize = SLRAM_BLK_SZ;
17ffc7ba	211	(*curmtd)->mtdinfo->writesize = 1;
1da177e4 LT	212
	213	if (add_mtd_device((*curmtd)->mtdinfo)) {
	214	E("slram: Failed to register new device\n");
	215	iounmap(((slram_priv_t )(curmtd)->mtdinfo->priv)->start);
	216	kfree((*curmtd)->mtdinfo->priv);
	217	kfree((*curmtd)->mtdinfo);
	218	return(-EAGAIN);
	219	}
	220	T("slram: Registered device %s from %luKiB to %luKiB\n", name,
	221	(start / 1024), ((start + length) / 1024));
	222	T("slram: Mapped from 0x%p to 0x%p\n",
	223	((slram_priv_t )(curmtd)->mtdinfo->priv)->start,
	224	((slram_priv_t )(curmtd)->mtdinfo->priv)->end);
e5580fbe	225	return(0);
1da177e4 LT	226	}
	227
	228	static void unregister_devices(void)
	229	{
	230	slram_mtd_list_t *nextitem;
	231
	232	while (slram_mtdlist) {
	233	nextitem = slram_mtdlist->next;
	234	del_mtd_device(slram_mtdlist->mtdinfo);
	235	iounmap(((slram_priv_t *)slram_mtdlist->mtdinfo->priv)->start);
	236	kfree(slram_mtdlist->mtdinfo->priv);
	237	kfree(slram_mtdlist->mtdinfo);
	238	kfree(slram_mtdlist);
	239	slram_mtdlist = nextitem;
	240	}
	241	}
	242
	243	static unsigned long handle_unit(unsigned long value, char *unit)
	244	{
	245	if ((unit == 'M') \|\| (unit == 'm')) {
	246	return(value * 1024 * 1024);
	247	} else if ((unit == 'K') \|\| (unit == 'k')) {
	248	return(value * 1024);
	249	}
	250	return(value);
	251	}
	252
	253	static int parse_cmdline(char devname, char szstart, char *szlength)
	254	{
	255	char *buffer;
	256	unsigned long devstart;
	257	unsigned long devlength;
e5580fbe	258
1da177e4 LT	259	if ((!devname) \|\| (!szstart) \|\| (!szlength)) {
	260	unregister_devices();
	261	return(-EINVAL);
	262	}
	263
	264	devstart = simple_strtoul(szstart, &buffer, 0);
	265	devstart = handle_unit(devstart, buffer);
e5580fbe	266
1da177e4 LT	267	if (*(szlength) != '+') {
	268	devlength = simple_strtoul(szlength, &buffer, 0);
	269	devlength = handle_unit(devlength, buffer) - devstart;
3afd522d RK	270	if (devlength < devstart)
	271	goto err_out;
	272
	273	devlength -= devstart;
1da177e4 LT	274	} else {
	275	devlength = simple_strtoul(szlength + 1, &buffer, 0);
	276	devlength = handle_unit(devlength, buffer);
	277	}
	278	T("slram: devname=%s, devstart=0x%lx, devlength=0x%lx\n",
	279	devname, devstart, devlength);
3afd522d RK	280	if (devlength % SLRAM_BLK_SZ != 0)
3afd522d RK	281	goto err_out;
e5580fbe	282
1da177e4 LT	283	if ((devstart = register_device(devname, devstart, devlength))){
	284	unregister_devices();
	285	return((int)devstart);
	286	}
	287	return(0);
3afd522d RK	288
	289	err_out:
	290	E("slram: Illegal length parameter.\n");
	291	return(-EINVAL);
1da177e4 LT	292	}
	293
	294	#ifndef MODULE
	295
	296	static int __init mtd_slram_setup(char *str)
	297	{
	298	map = str;
	299	return(1);
	300	}
	301
	302	__setup("slram=", mtd_slram_setup);
	303
	304	#endif
	305
627df23c	306	static int __init init_slram(void)
1da177e4 LT	307	{
	308	char *devname;
	309	int i;
	310
	311	#ifndef MODULE
	312	char *devstart;
	313	char *devlength;
	314
	315	i = 0;
	316
	317	if (!map) {
	318	E("slram: not enough parameters.\n");
	319	return(-EINVAL);
	320	}
	321	while (map) {
	322	devname = devstart = devlength = NULL;
	323
	324	if (!(devname = strsep(&map, ","))) {
	325	E("slram: No devicename specified.\n");
	326	break;
	327	}
	328	T("slram: devname = %s\n", devname);
	329	if ((!map) \|\| (!(devstart = strsep(&map, ",")))) {
	330	E("slram: No devicestart specified.\n");
	331	}
	332	T("slram: devstart = %s\n", devstart);
	333	if ((!map) \|\| (!(devlength = strsep(&map, ",")))) {
	334	E("slram: No devicelength / -end specified.\n");
	335	}
	336	T("slram: devlength = %s\n", devlength);
	337	if (parse_cmdline(devname, devstart, devlength) != 0) {
	338	return(-EINVAL);
	339	}
	340	}
	341	#else
	342	int count;
e5580fbe	343
269c0ee6	344	for (count = 0; count < SLRAM_MAX_DEVICES_PARAMS && map[count];
1da177e4 LT	345	count++) {
	346	}
	347
	348	if ((count % 3 != 0) \|\| (count == 0)) {
	349	E("slram: not enough parameters.\n");
	350	return(-EINVAL);
	351	}
	352	for (i = 0; i < (count / 3); i++) {
	353	devname = map[i * 3];
	354
	355	if (parse_cmdline(devname, map[i * 3 + 1], map[i * 3 + 2])!=0) {
	356	return(-EINVAL);
	357	}
e5580fbe	358
1da177e4 LT	359	}
1da177e4 LT	360	#endif /* !MODULE */
e5580fbe	361
1da177e4 LT	362	return(0);
	363	}
	364
	365	static void __exit cleanup_slram(void)
	366	{
	367	unregister_devices();
	368	}
	369
	370	module_init(init_slram);
	371	module_exit(cleanup_slram);
	372
	373	MODULE_LICENSE("GPL");
	374	MODULE_AUTHOR("Jochen Schaeuble <psionic@psionic.de>");
	375	MODULE_DESCRIPTION("MTD driver for uncached system RAM");