diff options
Diffstat (limited to 'target/linux/adm5120-2.6/files/drivers/mtd/nand/rbmipsnand.c')
| -rw-r--r-- | target/linux/adm5120-2.6/files/drivers/mtd/nand/rbmipsnand.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/target/linux/adm5120-2.6/files/drivers/mtd/nand/rbmipsnand.c b/target/linux/adm5120-2.6/files/drivers/mtd/nand/rbmipsnand.c new file mode 100644 index 0000000000..f086552904 --- /dev/null +++ b/target/linux/adm5120-2.6/files/drivers/mtd/nand/rbmipsnand.c @@ -0,0 +1,111 @@ +/*==============================================================================*/ +/* 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: "RouterBoard NAND Main", + offset: MTDPART_OFS_NXTBLK, + size: MTDPART_SIZ_FULL + } +}; + +static struct mtd_info rmtd; +static struct nand_chip rnand; + +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("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("RB1xx nand Unable ioremap buffer"); + return -ENXIO; + } + rnand.ecc.mode = NAND_ECC_SOFT; + 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("RB1xxx nand device not found"); + iounmap ((void *)p_nand); + return -ENXIO; + } + add_mtd_partitions(&rmtd, partition_info, 2); + init_ok = 1; + return 0; +} + +module_init(rbmips_init); + |