mtd/drivers/mtd/devices phram.c,NONE,1.1 Kconfig,1.6,1.7
Makefile.common,1.3,1.4
joern at infradead.org
joern at infradead.org
Thu Aug 21 13:52:33 EDT 2003
Update of /home/cvs/mtd/drivers/mtd/devices
In directory phoenix.infradead.org:/home/joern/mtd/drivers/mtd/devices
Modified Files:
Kconfig Makefile.common
Added Files:
phram.c
Log Message:
Add phram as a substiute for slram. The code is a bit cleaner and the new
command line interface much better. Thanks, Rusty!
--- NEW FILE phram.c ---
/**
*
* $Id: phram.c,v 1.1 2003/08/21 17:52:30 joern Exp $
*
* Copyright (c) Jochen Schaeuble <psionic at psionic.de>
* 07/2003 rewritten by Joern Engel <joern at wh.fh-wedel.de>
*
* DISCLAIMER: This driver makes use of Rusty's excellent module code,
* so it will not work for 2.4 without changes and it wont work for 2.4
* as a module without major changes. Oh well!
*
* Usage:
*
* one commend line parameter per device, each in the form:
* phram=<name>,<start>,<len>
* <name> may be up to 63 characters.
* <start> and <len> can be octal, decimal or hexadecimal. If followed
* by "k", "M" or "G", the numbers will be interpreted as kilo, mega or
* gigabytes.
*
*/
#include <asm/io.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/mtd/mtd.h>
#define ERROR(fmt, args...) printk(KERN_ERR "phram: " fmt , ## args)
struct phram_mtd_list {
struct list_head list;
struct mtd_info *mtdinfo;
};
static LIST_HEAD(phram_list);
int phram_erase(struct mtd_info *mtd, struct erase_info *instr)
{
u_char *start = (u_char *)mtd->priv;
if (instr->addr + instr->len > mtd->size)
return -EINVAL;
memset(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 phram_point(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char **mtdbuf)
{
u_char *start = (u_char *)mtd->priv;
if (from + len > mtd->size)
return -EINVAL;
*mtdbuf = start + from;
*retlen = len;
return 0;
}
void phram_unpoint(struct mtd_info *mtd, u_char *addr, loff_t from, size_t len)
{
}
int phram_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
u_char *start = (u_char *)mtd->priv;
if (from + len > mtd->size)
return -EINVAL;
memcpy(buf, start + from, len);
*retlen = len;
return 0;
}
int phram_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
u_char *start = (u_char *)mtd->priv;
if (to + len > mtd->size)
return -EINVAL;
memcpy(start + to, buf, len);
*retlen = len;
return 0;
}
static void unregister_devices(void)
{
struct phram_mtd_list *this;
list_for_each_entry(this, &phram_list, list) {
del_mtd_device(this->mtdinfo);
iounmap(this->mtdinfo->priv);
kfree(this->mtdinfo);
kfree(this);
}
}
static int register_device(char *name, unsigned long start, unsigned long len)
{
struct phram_mtd_list *new;
int ret = -ENOMEM;
new = kmalloc(sizeof(*new), GFP_KERNEL);
if (!new)
goto out0;
new->mtdinfo = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
if (!new->mtdinfo)
goto out1;
memset(new->mtdinfo, 0, sizeof(struct mtd_info));
ret = -EIO;
new->mtdinfo->priv = ioremap(start, len);
if (!new->mtdinfo->priv) {
ERROR("ioremap failed\n");
goto out2;
}
new->mtdinfo->name = name;
new->mtdinfo->size = len;
new->mtdinfo->flags = MTD_CAP_RAM | MTD_ERASEABLE | MTD_VOLATILE;
new->mtdinfo->erase = phram_erase;
new->mtdinfo->point = phram_point;
new->mtdinfo->unpoint = phram_unpoint;
new->mtdinfo->read = phram_read;
new->mtdinfo->write = phram_write;
new->mtdinfo->owner = THIS_MODULE;
new->mtdinfo->type = MTD_RAM;
new->mtdinfo->erasesize = 0x0;
ret = -EAGAIN;
if (add_mtd_device(new->mtdinfo)) {
ERROR("Failed to register new device\n");
goto out3;
}
list_add_tail(&new->list, &phram_list);
return 0;
out3:
iounmap(new->mtdinfo->priv);
out2:
kfree(new->mtdinfo);
out1:
kfree(new);
out0:
return ret;
}
static int ustrtoul(const char *cp, char **endp, unsigned int base)
{
unsigned long result = simple_strtoul(cp, endp, base);
switch (**endp) {
case 'G':
result *= 1024;
case 'M':
result *= 1024;
case 'k':
result *= 1024;
endp++;
}
return result;
}
static int parse_num32(uint32_t *num32, const char *token)
{
char *endp;
unsigned long n;
n = ustrtoul(token, &endp, 0);
if (*endp)
return -EINVAL;
*num32 = n;
return 0;
}
static int parse_name(char **pname, const char *token)
{
size_t len;
char *name;
len = strlen(token) + 1;
if (len > 64)
return -ENOSPC;
name = kmalloc(len, GFP_KERNEL);
if (!name)
return -ENOMEM;
strcpy(name, token);
*pname = name;
return 0;
}
#define parse_err(fmt, args...) do { \
ERROR(fmt , ## args); \
return 0; \
} while (0)
static int phram_setup(const char *val, struct kernel_param *kp)
{
char buf[64+12+12], *str = buf;
char *token[3];
char *name;
uint32_t start;
uint32_t len;
int i, ret;
if (strnlen(val, sizeof(str)) >= sizeof(str))
parse_err("parameter too long\n");
strcpy(str, val);
for (i=0; i<3; i++)
token[i] = strsep(&str, ",");
if (str)
parse_err("too many arguments\n");
if (!token[2])
parse_err("not enough arguments\n");
ret = parse_name(&name, token[0]);
if (ret == -ENOMEM)
parse_err("out of memory\n");
if (ret == -ENOSPC)
parse_err("name too long\n");
if (ret)
return 0;
ret = parse_num32(&start, token[1]);
if (ret)
parse_err("illegal start address\n");
ret = parse_num32(&len, token[2]);
if (ret)
parse_err("illegal device length\n");
register_device(name, start, len);
return 0;
}
module_param_call(phram, phram_setup, NULL, NULL, 000);
MODULE_PARM_DESC(phram, "Memory region to map. \"map=<name>,<start><length>\"");
/*
* Just for compatibility with slram, this is horrible and should go someday.
*/
static int __init slram_setup(const char *val, struct kernel_param *kp)
{
char buf[256], *str = buf;
if (!val || !val[0])
parse_err("no arguments to \"slram=\"\n");
if (strnlen(val, sizeof(str)) >= sizeof(str))
parse_err("parameter too long\n");
strcpy(str, val);
while (str) {
char *token[3];
char *name;
uint32_t start;
uint32_t len;
int i, ret;
for (i=0; i<3; i++) {
token[i] = strsep(&str, ",");
if (token[i])
continue;
parse_err("wrong number of arguments to \"slram=\"\n");
}
/* name */
ret = parse_name(&name, token[0]);
if (ret == -ENOMEM)
parse_err("of memory\n");
if (ret == -ENOSPC)
parse_err("too long\n");
if (ret)
return 1;
/* start */
ret = parse_num32(&start, token[1]);
if (ret)
parse_err("illegal start address\n");
/* len */
if (token[2][0] == '+')
ret = parse_num32(&len, token[2] + 1);
else
ret = parse_num32(&len, token[2]);
if (ret)
parse_err("illegal device length\n");
if (token[2][0] != '+') {
if (len < start)
parse_err("end < start\n");
len -= start;
}
register_device(name, start, len);
}
return 1;
}
module_param_call(slram, slram_setup, NULL, NULL, 000);
MODULE_PARM_DESC(slram, "List of memory regions to map. \"map=<name>,<start><length/end>\"");
int __init init_phram(void)
{
printk(KERN_ERR "phram loaded\n");
return 0;
}
static void __exit cleanup_phram(void)
{
unregister_devices();
}
module_init(init_phram);
module_exit(cleanup_phram);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jörn Engel <joern at wh.fh-wedel.de>");
MODULE_DESCRIPTION("MTD driver for physical RAM");
Index: Kconfig
===================================================================
RCS file: /home/cvs/mtd/drivers/mtd/devices/Kconfig,v
retrieving revision 1.6
retrieving revision 1.7
diff -u -r1.6 -r1.7
--- Kconfig 19 Aug 2003 09:24:35 -0000 1.6
+++ Kconfig 21 Aug 2003 17:52:29 -0000 1.7
@@ -60,6 +60,16 @@
you can still use it for storage or swap by using this driver to
present it to the system as a Memory Technology Device.
+config MTD_PHRAM
+ tristate "Physical system RAM"
+ depends on MTD
+ help
+ This is a re-implementation of the slram driver above.
+
+ Use this driver to access physical memory that the kernel proper
+ doesn't have access to, memory beyond the mem=xxx limit, nvram,
+ memory on the video card, etc...
+
config MTD_LART
tristate "28F160xx flash driver for LART"
depends on SA1100_LART && MTD
Index: Makefile.common
===================================================================
RCS file: /home/cvs/mtd/drivers/mtd/devices/Makefile.common,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -r1.3 -r1.4
--- Makefile.common 28 May 2003 10:54:23 -0000 1.3
+++ Makefile.common 21 Aug 2003 17:52:29 -0000 1.4
@@ -20,6 +20,7 @@
obj-$(CONFIG_MTD_DOC2001PLUS) += doc2001plus.o
obj-$(CONFIG_MTD_DOCPROBE) += docprobe.o docecc.o
obj-$(CONFIG_MTD_SLRAM) += slram.o
+obj-$(CONFIG_MTD_PHRAM) += phram.o
obj-$(CONFIG_MTD_PMC551) += pmc551.o
obj-$(CONFIG_MTD_MS02NV) += ms02-nv.o
obj-$(CONFIG_MTD_MTDRAM) += mtdram.o
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