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path: root/drivers/mtd/devices/slram.c
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Diffstat (limited to 'drivers/mtd/devices/slram.c')
-rw-r--r--drivers/mtd/devices/slram.c115
1 files changed, 46 insertions, 69 deletions
diff --git a/drivers/mtd/devices/slram.c b/drivers/mtd/devices/slram.c
index 84fa91392a8..2fc4957cbe7 100644
--- a/drivers/mtd/devices/slram.c
+++ b/drivers/mtd/devices/slram.c
@@ -1,7 +1,5 @@
/*======================================================================
- $Id: slram.c,v 1.34 2005/01/06 21:16:42 jwboyer 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
@@ -18,14 +16,14 @@
<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
+ With slram it's only possible to map a contiguous memory region. Therefore
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>
======================================================================*/
@@ -35,7 +33,6 @@
#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>
@@ -45,7 +42,6 @@
#include <linux/ioctl.h>
#include <linux/init.h>
#include <asm/io.h>
-#include <asm/system.h>
#include <linux/mtd/mtd.h>
@@ -77,8 +73,9 @@ static char *map;
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 *, u_char **);
-static void slram_unpoint(struct mtd_info *, u_char *, loff_t, size_t);
+static int slram_point(struct mtd_info *, loff_t, size_t, size_t *, void **,
+ resource_size_t *);
+static int 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 *);
@@ -86,39 +83,29 @@ 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 :)
+ /* 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, u_char **mtdbuf)
+ size_t *retlen, void **virt, resource_size_t *phys)
{
slram_priv_t *priv = mtd->priv;
- if (from + len > mtd->size)
- return -EINVAL;
-
- *mtdbuf = priv->start + from;
+ *virt = priv->start + from;
*retlen = len;
return(0);
}
-static void slram_unpoint(struct mtd_info *mtd, u_char *addr, loff_t from, size_t len)
+static int slram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
{
+ return 0;
}
static int slram_read(struct mtd_info *mtd, loff_t from, size_t len,
@@ -126,14 +113,7 @@ static int slram_read(struct mtd_info *mtd, loff_t from, size_t len,
{
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);
}
@@ -143,11 +123,7 @@ static int slram_write(struct mtd_info *mtd, loff_t to, size_t len,
{
slram_priv_t *priv = mtd->priv;
- if (to + len > mtd->size)
- return -EINVAL;
-
memcpy(priv->start + to, buf, len);
-
*retlen = len;
return(0);
}
@@ -168,19 +144,16 @@ static int register_device(char *name, unsigned long start, unsigned long length
E("slram: Cannot allocate new MTD device.\n");
return(-ENOMEM);
}
- (*curmtd)->mtdinfo = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
+ (*curmtd)->mtdinfo = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
(*curmtd)->next = NULL;
-
+
if ((*curmtd)->mtdinfo) {
- memset((char *)(*curmtd)->mtdinfo, 0, sizeof(struct mtd_info));
(*curmtd)->mtdinfo->priv =
- kmalloc(sizeof(slram_priv_t), GFP_KERNEL);
-
+ kzalloc(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));
}
}
@@ -188,7 +161,7 @@ static int register_device(char *name, unsigned long start, unsigned long length
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");
@@ -200,18 +173,18 @@ static int register_device(char *name, unsigned long start, unsigned long length
(*curmtd)->mtdinfo->name = name;
(*curmtd)->mtdinfo->size = length;
- (*curmtd)->mtdinfo->flags = MTD_CLEAR_BITS | MTD_SET_BITS |
- MTD_WRITEB_WRITEABLE | MTD_VOLATILE | 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->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)) {
+ if (mtd_device_register((*curmtd)->mtdinfo, NULL, 0)) {
E("slram: Failed to register new device\n");
iounmap(((slram_priv_t *)(*curmtd)->mtdinfo->priv)->start);
kfree((*curmtd)->mtdinfo->priv);
@@ -223,7 +196,7 @@ static int register_device(char *name, unsigned long start, unsigned long length
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);
+ return(0);
}
static void unregister_devices(void)
@@ -232,7 +205,7 @@ static void unregister_devices(void)
while (slram_mtdlist) {
nextitem = slram_mtdlist->next;
- del_mtd_device(slram_mtdlist->mtdinfo);
+ mtd_device_unregister(slram_mtdlist->mtdinfo);
iounmap(((slram_priv_t *)slram_mtdlist->mtdinfo->priv)->start);
kfree(slram_mtdlist->mtdinfo->priv);
kfree(slram_mtdlist->mtdinfo);
@@ -256,7 +229,7 @@ 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);
@@ -264,26 +237,32 @@ static int parse_cmdline(char *devname, char *szstart, char *szlength)
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;
+ devlength = handle_unit(devlength, buffer);
+ 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 ((devstart < 0) || (devlength < 0) || (devlength % SLRAM_BLK_SZ != 0)) {
- E("slram: Illegal start / length parameter.\n");
- return(-EINVAL);
- }
-
+ 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
@@ -298,17 +277,14 @@ __setup("slram=", mtd_slram_setup);
#endif
-static int init_slram(void)
+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);
@@ -335,8 +311,9 @@ static int init_slram(void)
}
#else
int count;
-
- for (count = 0; (map[count]) && (count < SLRAM_MAX_DEVICES_PARAMS);
+ int i;
+
+ for (count = 0; count < SLRAM_MAX_DEVICES_PARAMS && map[count];
count++) {
}
@@ -350,10 +327,10 @@ static int init_slram(void)
if (parse_cmdline(devname, map[i * 3 + 1], map[i * 3 + 2])!=0) {
return(-EINVAL);
}
-
+
}
#endif /* !MODULE */
-
+
return(0);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-13 19:24:43 +0000