/*======================================================================
- $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
#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>
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 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_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;
+ /* can we return a physical address with this driver? */
+ if (phys)
+ return -EINVAL;
+
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 void slram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
{
}
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));
}
}
(*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->flags = MTD_CAP_RAM;
(*curmtd)->mtdinfo->erase = slram_erase;
(*curmtd)->mtdinfo->point = slram_point;
(*curmtd)->mtdinfo->unpoint = slram_unpoint;
(*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");
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 ((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
#endif
-static int init_slram(void)
+static int __init init_slram(void)
{
char *devname;
int i;