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openwrt/target/linux/brcm63xx/files/drivers/mtd/maps/bcm963xx-flash.c

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/*
* $Id$
* Copyright (C) 2006 Florian Fainelli <florian@openwrt.org>
* Mike Albon <malbon@openwrt.org>
* Copyright (C) $Date$ $Author$
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* This is the BCM963xx flash map driver, in its actual state it only supports BCM96348 devices
* this driver is able to manage both bootloader we found on these boards : CFE and RedBoot
*
* RedBoot :
* - this bootloader allows us to parse partitions and therefore deduce the MTD partition table
*
* CFE :
* - CFE partitionning can be detected as for BCM947xx devices
*
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mtd/map.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/vmalloc.h>
#include <asm/io.h>
#define WINDOW_ADDR 0x1FC00000 /* Real address of the flash */
#define WINDOW_SIZE 0x400000 /* Size of flash */
#define BUSWIDTH 2 /* Buswidth */
#define EXTENDED_SIZE 0xBFC00000 /* Extended flash address */
#define IMAGE_LEN 10 /* Length of Length Field */
#define ADDRESS_LEN 12 /* Length of Address field */
#define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y))
extern int boot_loader_type; /* For RedBoot / CFE detection */
extern int parse_redboot_partitions(struct mtd_info *master, struct mtd_partition **pparts, unsigned long fis_origin);
static struct mtd_partition *parsed_parts;
static void __exit bcm963xx_mtd_cleanup(void);
static struct mtd_info *bcm963xx_mtd_info;
static struct map_info bcm963xx_map = {
.name = "bcm963xx",
.size = WINDOW_SIZE,
.bankwidth = BUSWIDTH,
.phys = WINDOW_ADDR,
};
int parse_cfe_partitions( struct mtd_info *master, struct mtd_partition **pparts)
{
int nrparts = 2, curpart = 0; // CFE and NVRAM always present.
struct bcm963xx_cfe_map {
unsigned char tagVersion[4]; // Version of the image tag
unsigned char sig_1[20]; // Company Line 1
unsigned char sig_2[14]; // Company Line 2
unsigned char chipid[6]; // Chip this image is for
unsigned char boardid[16]; // Board name
unsigned char bigEndian[2]; // Map endianness -- 1 BE 0 LE
unsigned char totalLength[IMAGE_LEN]; //Total length of image
unsigned char cfeAddress[ADDRESS_LEN]; // Address in memory of CFE
unsigned char cfeLength[IMAGE_LEN]; // Size of CFE
unsigned char rootAddress[ADDRESS_LEN]; // Address in memory of rootfs
unsigned char rootLength[IMAGE_LEN]; // Size of rootfs
unsigned char kernelAddress[ADDRESS_LEN]; // Address in memory of kernel
unsigned char kernelLength[IMAGE_LEN]; // Size of kernel
unsigned char dualImage[2]; // Unused at present
unsigned char inactiveFlag[2]; // Unused at present
unsigned char reserved1[74]; // Reserved area not in use
unsigned char imageCRC[4]; // CRC32 of images
unsigned char reserved2[16]; // Unused at present
unsigned char headerCRC[4]; // CRC32 of header excluding tagVersion
unsigned char reserved3[16]; // Unused at present
} *buf;
struct mtd_partition *parts;
int ret;
size_t retlen;
unsigned int rootfsaddr, kerneladdr, spareaddr;
unsigned int rootfslen, kernellen, sparelen, totallen;
int namelen = 0;
int i;
// Allocate memory for buffer
buf = vmalloc(sizeof(struct bcm963xx_cfe_map));
if (!buf)
return -ENOMEM;
// Get the tag
ret = master->read(master,master->erasesize,sizeof(struct bcm963xx_cfe_map), &retlen, (void *)buf);
if (retlen != sizeof(struct bcm963xx_cfe_map)){
vfree(buf);
return -EIO;
};
printk("bcm963xx: CFE boot tag found with version %s and board type %s.\n",buf->tagVersion,buf->boardid);
// Get the values and calculate
sscanf(buf->rootAddress,"%u", &rootfsaddr);
rootfsaddr = rootfsaddr - EXTENDED_SIZE;
sscanf(buf->rootLength, "%u", &rootfslen);
sscanf(buf->kernelAddress, "%u", &kerneladdr);
kerneladdr = kerneladdr - EXTENDED_SIZE;
sscanf(buf->kernelLength, "%u", &kernellen);
sscanf(buf->totalLength, "%u", &totallen);
spareaddr = ROUNDUP(totallen,master->erasesize) + master->erasesize;
sparelen = master->size - spareaddr - master->erasesize;
// Determine number of partitions
namelen = 8;
if (rootfslen > 0){
nrparts++;
namelen =+ 6;
};
if (kernellen > 0){
nrparts++;
namelen =+ 6;
};
// Ask kernel for more memory.
parts = kmalloc(sizeof(*parts)*nrparts+10*nrparts, GFP_KERNEL);
if (!parts){
vfree(buf);
return -ENOMEM;
};
memset(parts,0,sizeof(*parts)*nrparts+10*nrparts);
// Start building partition list
parts[curpart].name = "CFE";
parts[curpart].offset = 0;
parts[curpart].size = master->erasesize;
curpart++;
if (kernellen > 0){
parts[curpart].name = "kernel";
parts[curpart].offset = kerneladdr;
parts[curpart].size = kernellen;
curpart++;
};
if (rootfslen > 0){
parts[curpart].name = "rootfs";
parts[curpart].offset = rootfsaddr;
parts[curpart].size = rootfslen;
if (sparelen > 0)
parts[curpart].size += sparelen;
curpart++;
};
parts[curpart].name = "nvram";
parts[curpart].offset = master->size - master->erasesize;
parts[curpart].size = master->erasesize;
for (i = 0; i < nrparts; i++) {
printk("bcm963xx: Partition %d is %s offset %x and length %x\n", i, parts[i].name, parts[i].offset, parts[i].size);
}
*pparts = parts;
vfree(buf);
return nrparts;
};
static struct mtd_partition bcm963xx_parts[] = {
{ name: "bootloader", size: 0, offset: 0, mask_flags: MTD_WRITEABLE },
{ name: "rootfs", size: 0, offset: 0},
{ name: "jffs2", size: 5 * 0x10000, offset: 57*0x10000}
};
static int bcm963xx_parts_size = sizeof(bcm963xx_parts) / sizeof(bcm963xx_parts[0]);
static int bcm963xx_detect_cfe(struct mtd_info *master)
{
int idoffset = 0x4e0;
static char idstring[8] = "CFE1CFE1";
char buf[8];
int ret;
size_t retlen;
ret = master->read(master, idoffset, 8, &retlen, (void *)buf);
printk("bcm963xx: Read Signature value of %s\n", buf);
return strcmp(idstring,buf);
}
static int __init bcm963xx_mtd_init(void)
{
printk("bcm963xx: 0x%08x at 0x%08x\n", WINDOW_SIZE, WINDOW_ADDR);
bcm963xx_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);
if (!bcm963xx_map.virt) {
printk("bcm963xx: Failed to ioremap\n");
return -EIO;
}
simple_map_init(&bcm963xx_map);
bcm963xx_mtd_info = do_map_probe("cfi_probe", &bcm963xx_map);
if (bcm963xx_mtd_info) {
bcm963xx_mtd_info->owner = THIS_MODULE;
//if (boot_loader_type == BOOT_CFE)
if (bcm963xx_detect_cfe(bcm963xx_mtd_info) == 0)
{
int parsed_nr_parts = 0;
char * part_type;
printk("bcm963xx: CFE bootloader detected\n");
//add_mtd_device(bcm963xx_mtd_info);
//add_mtd_partitions(bcm963xx_mtd_info, bcm963xx_parts, bcm963xx_parts_size);
if (parsed_nr_parts == 0) {
int ret = parse_cfe_partitions(bcm963xx_mtd_info, &parsed_parts);
if (ret > 0) {
part_type = "CFE";
parsed_nr_parts = ret;
}
}
add_mtd_partitions(bcm963xx_mtd_info, parsed_parts, parsed_nr_parts);
return 0;
}
else
{
int parsed_nr_parts = 0;
char * part_type;
if (bcm963xx_mtd_info->size > 0x00400000) {
printk("Support for extended flash memory size : 0x%08X ; ONLY 64MBIT SUPPORT\n", bcm963xx_mtd_info->size);
bcm963xx_map.virt = (unsigned long)(EXTENDED_SIZE);
}
#ifdef CONFIG_MTD_REDBOOT_PARTS
if (parsed_nr_parts == 0) {
int ret = parse_redboot_partitions(bcm963xx_mtd_info, &parsed_parts, 0);
if (ret > 0) {
part_type = "RedBoot";
parsed_nr_parts = ret;
}
}
#endif
add_mtd_partitions(bcm963xx_mtd_info, parsed_parts, parsed_nr_parts);
return 0;
}
}
iounmap(bcm963xx_map.virt);
return -ENXIO;
}
static void __exit bcm963xx_mtd_cleanup(void)
{
if (bcm963xx_mtd_info) {
del_mtd_partitions(bcm963xx_mtd_info);
map_destroy(bcm963xx_mtd_info);
}
if (bcm963xx_map.virt) {
iounmap(bcm963xx_map.virt);
bcm963xx_map.virt = 0;
}
}
module_init(bcm963xx_mtd_init);
module_exit(bcm963xx_mtd_cleanup);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org> Mike Albon <malbon@openwrt.org>");
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