/*======================================================================
- $Id: slram.c,v 1.34 2005/01/06 21:16:42 jwboyer Exp $
+ $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
<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>
======================================================================*/
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.
*/
}
(*curmtd)->mtdinfo = kmalloc(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);
-
+
if (!(*curmtd)->mtdinfo->priv) {
kfree((*curmtd)->mtdinfo);
(*curmtd)->mtdinfo = NULL;
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");
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)
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;
E("slram: Illegal start / length parameter.\n");
return(-EINVAL);
}
-
+
if ((devstart = register_device(devname, devstart, devlength))){
unregister_devices();
return((int)devstart);
}
#else
int count;
-
+
for (count = 0; (map[count]) && (count < SLRAM_MAX_DEVICES_PARAMS);
count++) {
}
if (parse_cmdline(devname, map[i * 3 + 1], map[i * 3 + 2])!=0) {
return(-EINVAL);
}
-
+
}
#endif /* !MODULE */
-
+
return(0);
}