- 根目录:
- drivers
- mtd
- maps
- nettel.c
/****************************************************************************/
/*
* nettel.c -- mappings for NETtel/SecureEdge/SnapGear (x86) boards.
*
* (C) Copyright 2000-2001, Greg Ungerer (gerg@snapgear.com)
* (C) Copyright 2001-2002, SnapGear (www.snapgear.com)
*/
/****************************************************************************/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/cfi.h>
#include <linux/reboot.h>
#include <linux/err.h>
#include <linux/kdev_t.h>
#include <linux/root_dev.h>
#include <asm/io.h>
/****************************************************************************/
#define INTEL_BUSWIDTH 1
#define AMD_WINDOW_MAXSIZE 0x00200000
#define AMD_BUSWIDTH 1
/*
* PAR masks and shifts, assuming 64K pages.
*/
#define SC520_PAR_ADDR_MASK 0x00003fff
#define SC520_PAR_ADDR_SHIFT 16
#define SC520_PAR_TO_ADDR(par) \
(((par)&SC520_PAR_ADDR_MASK) << SC520_PAR_ADDR_SHIFT)
#define SC520_PAR_SIZE_MASK 0x01ffc000
#define SC520_PAR_SIZE_SHIFT 2
#define SC520_PAR_TO_SIZE(par) \
((((par)&SC520_PAR_SIZE_MASK) << SC520_PAR_SIZE_SHIFT) + (64*1024))
#define SC520_PAR(cs, addr, size) \
((cs) | \
((((size)-(64*1024)) >> SC520_PAR_SIZE_SHIFT) & SC520_PAR_SIZE_MASK) | \
(((addr) >> SC520_PAR_ADDR_SHIFT) & SC520_PAR_ADDR_MASK))
#define SC520_PAR_BOOTCS 0x8a000000
#define SC520_PAR_ROMCS1 0xaa000000
#define SC520_PAR_ROMCS2 0xca000000 /* Cache disabled, 64K page */
static void *nettel_mmcrp = NULL;
#ifdef CONFIG_MTD_CFI_INTELEXT
static struct mtd_info *intel_mtd;
#endif
static struct mtd_info *amd_mtd;
/****************************************************************************/
/****************************************************************************/
#ifdef CONFIG_MTD_CFI_INTELEXT
static struct map_info nettel_intel_map = {
.name = "SnapGear Intel",
.size = 0,
.bankwidth = INTEL_BUSWIDTH,
};
static struct mtd_partition nettel_intel_partitions[] = {
{
.name = "SnapGear kernel",
.offset = 0,
.size = 0x000e0000
},
{
.name = "SnapGear filesystem",
.offset = 0x00100000,
},
{
.name = "SnapGear config",
.offset = 0x000e0000,
.size = 0x00020000
},
{
.name = "SnapGear Intel",
.offset = 0
},
{
.name = "SnapGear BIOS Config",
.offset = 0x007e0000,
.size = 0x00020000
},
{
.name = "SnapGear BIOS",
.offset = 0x007e0000,
.size = 0x00020000
},
};
#endif
static struct map_info nettel_amd_map = {
.name = "SnapGear AMD",
.size = AMD_WINDOW_MAXSIZE,
.bankwidth = AMD_BUSWIDTH,
};
static struct mtd_partition nettel_amd_partitions[] = {
{
.name = "SnapGear BIOS config",
.offset = 0x000e0000,
.size = 0x00010000
},
{
.name = "SnapGear BIOS",
.offset = 0x000f0000,
.size = 0x00010000
},
{
.name = "SnapGear AMD",
.offset = 0
},
{
.name = "SnapGear high BIOS",
.offset = 0x001f0000,
.size = 0x00010000
}
};
#define NUM_AMD_PARTITIONS ARRAY_SIZE(nettel_amd_partitions)
/****************************************************************************/
#ifdef CONFIG_MTD_CFI_INTELEXT
/*
* Set the Intel flash back to read mode since some old boot
* loaders don't.
*/
static int nettel_reboot_notifier(struct notifier_block *nb, unsigned long val, void *v)
{
struct cfi_private *cfi = nettel_intel_map.fldrv_priv;
unsigned long b;
/* Make sure all FLASH chips are put back into read mode */
for (b = 0; (b < nettel_intel_partitions[3].size); b += 0x100000) {
cfi_send_gen_cmd(0xff, 0x55, b, &nettel_intel_map, cfi,
cfi->device_type, NULL);
}
return(NOTIFY_OK);
}
static struct notifier_block nettel_notifier_block = {
nettel_reboot_notifier, NULL, 0
};
#endif
/****************************************************************************/
static int __init nettel_init(void)
{
volatile unsigned long *amdpar;
unsigned long amdaddr, maxsize;
int num_amd_partitions=0;
#ifdef CONFIG_MTD_CFI_INTELEXT
volatile unsigned long *intel0par, *intel1par;
unsigned long orig_bootcspar, orig_romcs1par;
unsigned long intel0addr, intel0size;
unsigned long intel1addr, intel1size;
int intelboot, intel0cs, intel1cs;
int num_intel_partitions;
#endif
int rc = 0;
nettel_mmcrp = (void *) ioremap_nocache(0xfffef000, 4096);
if (nettel_mmcrp == NULL) {
printk("SNAPGEAR: failed to disable MMCR cache??\n");
return(-EIO);
}
/* Set CPU clock to be 33.000MHz */
*((unsigned char *) (nettel_mmcrp + 0xc64)) = 0x01;
amdpar = (volatile unsigned long *) (nettel_mmcrp + 0xc4);
#ifdef CONFIG_MTD_CFI_INTELEXT
intelboot = 0;
intel0cs = SC520_PAR_ROMCS1;
intel0par = (volatile unsigned long *) (nettel_mmcrp + 0xc0);
intel1cs = SC520_PAR_ROMCS2;
intel1par = (volatile unsigned long *) (nettel_mmcrp + 0xbc);
/*
* Save the CS settings then ensure ROMCS1 and ROMCS2 are off,
* otherwise they might clash with where we try to map BOOTCS.
*/
orig_bootcspar = *amdpar;
orig_romcs1par = *intel0par;
*intel0par = 0;
*intel1par = 0;
#endif
/*
* The first thing to do is determine if we have a separate
* boot FLASH device. Typically this is a small (1 to 2MB)
* AMD FLASH part. It seems that device size is about the
* only way to tell if this is the case...
*/
amdaddr = 0x20000000;
maxsize = AMD_WINDOW_MAXSIZE;
*amdpar = SC520_PAR(SC520_PAR_BOOTCS, amdaddr, maxsize);
__asm__ ("wbinvd");
nettel_amd_map.phys = amdaddr;
nettel_amd_map.virt = ioremap_nocache(amdaddr, maxsize);
if (!nettel_amd_map.virt) {
printk("SNAPGEAR: failed to ioremap() BOOTCS\n");
iounmap(nettel_mmcrp);
return(-EIO);
}
simple_map_init(&nettel_amd_map);
if ((amd_mtd = do_map_probe("jedec_probe", &nettel_amd_map))) {
printk(KERN_NOTICE "SNAPGEAR: AMD flash device size = %dK\n",
(int)(amd_mtd->size>>10));
amd_mtd->owner = THIS_MODULE;
/* The high BIOS partition is only present for 2MB units */
num_amd_partitions = NUM_AMD_PARTITIONS;
if (amd_mtd->size < AMD_WINDOW_MAXSIZE)
num_amd_partitions--;
/* Don't add the partition until after the primary INTEL's */
#ifdef CONFIG_MTD_CFI_INTELEXT
/*
* Map the Intel flash into memory after the AMD
* It has to start on a multiple of maxsize.
*/
maxsize = SC520_PAR_TO_SIZE(orig_romcs1par);
if (maxsize < (32 * 1024 * 1024))
maxsize = (32 * 1024 * 1024);
intel0addr = amdaddr + maxsize;
#endif
} else {
#ifdef CONFIG_MTD_CFI_INTELEXT
/* INTEL boot FLASH */
intelboot++;
if (!orig_romcs1par) {
intel0cs = SC520_PAR_BOOTCS;
intel0par = (volatile unsigned long *)
(nettel_mmcrp + 0xc4);
intel1cs = SC520_PAR_ROMCS1;
intel1par = (volatile unsigned long *)
(nettel_mmcrp + 0xc0);
intel0addr = SC520_PAR_TO_ADDR(orig_bootcspar);
maxsize = SC520_PAR_TO_SIZE(orig_bootcspar);
} else {
/* Kernel base is on ROMCS1, not BOOTCS */
intel0cs = SC520_PAR_ROMCS1;
intel0par = (volatile unsigned long *)
(nettel_mmcrp + 0xc0);
intel1cs = SC520_PAR_BOOTCS;
intel1par = (volatile unsigned long *)
(nettel_mmcrp + 0xc4);
intel0addr = SC520_PAR_TO_ADDR(orig_romcs1par);
maxsize = SC520_PAR_TO_SIZE(orig_romcs1par);
}
/* Destroy useless AMD MTD mapping */
amd_mtd = NULL;
iounmap(nettel_amd_map.virt);
nettel_amd_map.virt = NULL;
#else
/* Only AMD flash supported */
rc = -ENXIO;
goto out_unmap2;
#endif
}
#ifdef CONFIG_MTD_CFI_INTELEXT
/*
* We have determined the INTEL FLASH configuration, so lets
* go ahead and probe for them now.
*/
/* Set PAR to the maximum size */
if (maxsize < (32 * 1024 * 1024))
maxsize = (32 * 1024 * 1024);
*intel0par = SC520_PAR(intel0cs, intel0addr, maxsize);
/* Turn other PAR off so the first probe doesn't find it */
*intel1par = 0;
/* Probe for the size of the first Intel flash */
nettel_intel_map.size = maxsize;
nettel_intel_map.phys = intel0addr;
nettel_intel_map.virt = ioremap_nocache(intel0addr, maxsize);
if (!nettel_intel_map.virt) {
printk("SNAPGEAR: failed to ioremap() ROMCS1\n");
rc = -EIO;
goto out_unmap2;
}
simple_map_init(&nettel_intel_map);
intel_mtd = do_map_probe("cfi_probe", &nettel_intel_map);
if (!intel_mtd) {
rc = -ENXIO;
goto out_unmap1;
}
/* Set PAR to the detected size */
intel0size = intel_mtd->size;
*intel0par = SC520_PAR(intel0cs, intel0addr, intel0size);
/*
* Map second Intel FLASH right after first. Set its size to the
* same maxsize used for the first Intel FLASH.
*/
intel1addr = intel0addr + intel0size;
*intel1par = SC520_PAR(intel1cs, intel1addr, maxsize);
__asm__ ("wbinvd");
maxsize += intel0size;
/* Delete the old map and probe again to do both chips */
map_destroy(intel_mtd);
intel_mtd = NULL;
iounmap(nettel_intel_map.virt);
nettel_intel_map.size = maxsize;
nettel_intel_map.virt = ioremap_nocache(intel0addr, maxsize);
if (!nettel_intel_map.virt) {
printk("SNAPGEAR: failed to ioremap() ROMCS1/2\n");
rc = -EIO;
goto out_unmap2;
}
intel_mtd = do_map_probe("cfi_probe", &nettel_intel_map);
if (! intel_mtd) {
rc = -ENXIO;
goto out_unmap1;
}
intel1size = intel_mtd->size - intel0size;
if (intel1size > 0) {
*intel1par = SC520_PAR(intel1cs, intel1addr, intel1size);
__asm__ ("wbinvd");
} else {
*intel1par = 0;
}
printk(KERN_NOTICE "SNAPGEAR: Intel flash device size = %lldKiB\n",
(unsigned long long)(intel_mtd->size >> 10));
intel_mtd->owner = THIS_MODULE;
num_intel_partitions = ARRAY_SIZE(nettel_intel_partitions);
if (intelboot) {
/*
* Adjust offset and size of last boot partition.
* Must allow for BIOS region at end of FLASH.
*/
nettel_intel_partitions[1].size = (intel0size + intel1size) -
(1024*1024 + intel_mtd->erasesize);
nettel_intel_partitions[3].size = intel0size + intel1size;
nettel_intel_partitions[4].offset =
(intel0size + intel1size) - intel_mtd->erasesize;
nettel_intel_partitions[4].size = intel_mtd->erasesize;
nettel_intel_partitions[5].offset =
nettel_intel_partitions[4].offset;
nettel_intel_partitions[5].size =
nettel_intel_partitions[4].size;
} else {
/* No BIOS regions when AMD boot */
num_intel_partitions -= 2;
}
rc = mtd_device_register(intel_mtd, nettel_intel_partitions,
num_intel_partitions);
#endif
if (amd_mtd) {
rc = mtd_device_register(amd_mtd, nettel_amd_partitions,
num_amd_partitions);
}
#ifdef CONFIG_MTD_CFI_INTELEXT
register_reboot_notifier(&nettel_notifier_block);
#endif
return(rc);
#ifdef CONFIG_MTD_CFI_INTELEXT
out_unmap1:
iounmap(nettel_intel_map.virt);
#endif
out_unmap2:
iounmap(nettel_mmcrp);
iounmap(nettel_amd_map.virt);
return(rc);
}
/****************************************************************************/
static void __exit nettel_cleanup(void)
{
#ifdef CONFIG_MTD_CFI_INTELEXT
unregister_reboot_notifier(&nettel_notifier_block);
#endif
if (amd_mtd) {
mtd_device_unregister(amd_mtd);
map_destroy(amd_mtd);
}
if (nettel_mmcrp) {
iounmap(nettel_mmcrp);
nettel_mmcrp = NULL;
}
if (nettel_amd_map.virt) {
iounmap(nettel_amd_map.virt);
nettel_amd_map.virt = NULL;
}
#ifdef CONFIG_MTD_CFI_INTELEXT
if (intel_mtd) {
mtd_device_unregister(intel_mtd);
map_destroy(intel_mtd);
}
if (nettel_intel_map.virt) {
iounmap(nettel_intel_map.virt);
nettel_intel_map.virt = NULL;
}
#endif
}
/****************************************************************************/
module_init(nettel_init);
module_exit(nettel_cleanup);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
MODULE_DESCRIPTION("SnapGear/SecureEdge FLASH support");
/****************************************************************************/