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/*==============================================================================*/
/* rbmipsnand.c */
/* This module is derived from the 2.4 driver shipped by Microtik for their */
/* Routerboard 1xx and 5xx series boards. It provides support for the built in */
/* NAND flash on the Routerboard 1xx series boards for Linux 2.6.19+. */
/* Licence: Original Microtik code seems not to have a licence. */
/* Rewritten code all GPL V2. */
/* Copyright(C) 2007 david.goodenough@linkchoose.co.uk (for rewriten code) */
/*==============================================================================*/
#include <linux/init.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/bootinfo.h>
#define SMEM1_BASE 0x10000000 // from ADM5120 documentation
#define SMEM1(x) (*((volatile unsigned char *) (KSEG1ADDR(SMEM1_BASE) + x)))
#define NAND_RW_REG 0x0 //data register
#define NAND_SET_CEn 0x1 //CE# low
#define NAND_CLR_CEn 0x2 //CE# high
#define NAND_CLR_CLE 0x3 //CLE low
#define NAND_SET_CLE 0x4 //CLE high
#define NAND_CLR_ALE 0x5 //ALE low
#define NAND_SET_ALE 0x6 //ALE high
#define NAND_SET_SPn 0x7 //SP# low (use spare area)
#define NAND_CLR_SPn 0x8 //SP# high (do not use spare area)
#define NAND_SET_WPn 0x9 //WP# low
#define NAND_CLR_WPn 0xA //WP# high
#define NAND_STS_REG 0xB //Status register
#define MEM32(x) *((volatile unsigned *) (x))
static void __iomem *p_nand;
static int rb100_dev_ready(struct mtd_info *mtd) {
return SMEM1(NAND_STS_REG) & 0x80;
}
static void rbmips_hwcontrol100(struct mtd_info *mtd, int cmd, unsigned int ctrl) {
struct nand_chip *chip = mtd->priv;
if (ctrl & NAND_CTRL_CHANGE) {
SMEM1((( ctrl & NAND_CLE) ? NAND_SET_CLE : NAND_CLR_CLE)) = 0x01;
SMEM1((( ctrl & NAND_ALE) ? NAND_SET_ALE : NAND_CLR_ALE)) = 0x01;
SMEM1((( ctrl & NAND_NCE) ? NAND_SET_CEn : NAND_CLR_CEn)) = 0x01;
}
if( cmd != NAND_CMD_NONE)
writeb( cmd, chip->IO_ADDR_W);
}
static struct mtd_partition partition_info[] = {
{
name: "RouterBoard NAND Boot",
offset: 0,
size: 4 * 1024 * 1024
},
{
name: "rootfs",
offset: MTDPART_OFS_NXTBLK,
size: MTDPART_SIZ_FULL
}
};
static struct mtd_info rmtd;
static struct nand_chip rnand;
/*========================================================================*/
/* We need to use the OLD Yaffs-1 OOB layout, otherwise the RB bootloader */
/* will not be able to find the kernel that we load. So set the oobinfo */
/* when creating the partitions. */
/*========================================================================*/
static struct nand_ecclayout rb_ecclayout = {
.eccbytes = 6,
.eccpos = { 8, 9, 10, 13, 14, 15 },
.oobavail = 9,
.oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1} }
};
static unsigned init_ok = 0;
unsigned get_rbnand_block_size(void) {
return init_ok ? rmtd.writesize : 0;
}
EXPORT_SYMBOL(get_rbnand_block_size);
int __init rbmips_init(void) {
memset(&rmtd, 0, sizeof(rmtd));
memset(&rnand, 0, sizeof(rnand));
printk(KERN_INFO "RB1xx nand\n");
MEM32(0xB2000064) = 0x100;
MEM32(0xB2000008) = 0x1;
SMEM1(NAND_SET_SPn) = 0x01;
SMEM1(NAND_CLR_WPn) = 0x01;
rnand.IO_ADDR_R = (unsigned char *)KSEG1ADDR(SMEM1_BASE);
rnand.IO_ADDR_W = rnand.IO_ADDR_R;
rnand.cmd_ctrl = rbmips_hwcontrol100;
rnand.dev_ready = rb100_dev_ready;
p_nand = (void __iomem *)ioremap(( unsigned long)SMEM1_BASE, 0x1000);
if (!p_nand) {
printk(KERN_WARNING "RB1xx nand Unable ioremap buffer\n");
return -ENXIO;
}
rnand.ecc.mode = NAND_ECC_SOFT;
rnand.ecc.layout = &rb_ecclayout;
rnand.chip_delay = 25;
rnand.options |= NAND_NO_AUTOINCR;
rmtd.priv = &rnand;
if (nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1)
&& nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1)) {
printk(KERN_INFO "RB1xxx nand device not found\n");
iounmap ((void *)p_nand);
return -ENXIO;
}
add_mtd_partitions(&rmtd, partition_info, 2);
init_ok = 1;
return 0;
}
module_init(rbmips_init);
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