[U-Boot] [PATCH v4 4/7] jz4740 nand driver

Xiangfu Liu
2010-12-08T06:20:46Z

Signed-off-by: Xiangfu Liu <xiangfu@openmobilefree.net>
---
drivers/mtd/nand/Makefile | 1 +
drivers/mtd/nand/jz4740_nand.c | 252 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 253 insertions(+), 0 deletions(-)
create mode 100644 drivers/mtd/nand/jz4740_nand.c

diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 8b598f6..bf2a8f9 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -50,6 +50,7 @@ COBJS-$(CONFIG_NAND_S3C64XX) += s3c64xx.o
COBJS-$(CONFIG_NAND_SPEAR) += spr_nand.o
COBJS-$(CONFIG_NAND_OMAP_GPMC) += omap_gpmc.o
COBJS-$(CONFIG_NAND_PLAT) += nand_plat.o
+COBJS-$(CONFIG_NAND_JZ4740) += jz4740_nand.o
endif

COBJS := $(COBJS-y)
diff --git a/drivers/mtd/nand/jz4740_nand.c b/drivers/mtd/nand/jz4740_nand.c
new file mode 100644
index 0000000..e82d7d3
--- /dev/null
+++ b/drivers/mtd/nand/jz4740_nand.c
@@ -0,0 +1,252 @@
+/*
+ * Platform independend driver for JZ4740.
+ *
+ * Copyright (c) 2007 Ingenic Semiconductor Inc.
+ * Author: <jlwei@ingenic.cn>
+ *
+ * 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.
+ */
+#include <common.h>
+
+#if defined(CONFIG_CMD_NAND)
+#include <nand.h>
+#include <asm/io.h>
+#include <asm/jz4740.h>
+
+#define JZ_NAND_DATA_ADDR ((void __iomem *)0xB8000000)
+#define JZ_NAND_CMD_ADDR (JZ_NAND_DATA_ADDR + 0x8000)
+#define JZ_NAND_ADDR_ADDR (JZ_NAND_DATA_ADDR + 0x10000)
+
+#define BIT(x) (1 << (x))
+#define JZ_NAND_ECC_CTRL_ENCODING BIT(3)
+#define JZ_NAND_ECC_CTRL_RS BIT(2)
+#define JZ_NAND_ECC_CTRL_RESET BIT(1)
+#define JZ_NAND_ECC_CTRL_ENABLE BIT(0)
+
+static struct nand_ecclayout qi_lb60_ecclayout_2gb = {
+ .eccbytes = 72,
+ .eccpos = {
+ 12, 13, 14, 15, 16, 17, 18, 19,
+ 20, 21, 22, 23, 24, 25, 26, 27,
+ 28, 29, 30, 31, 32, 33, 34, 35,
+ 36, 37, 38, 39, 40, 41, 42, 43,
+ 44, 45, 46, 47, 48, 49, 50, 51,
+ 52, 53, 54, 55, 56, 57, 58, 59,
+ 60, 61, 62, 63, 64, 65, 66, 67,
+ 68, 69, 70, 71, 72, 73, 74, 75,
+ 76, 77, 78, 79, 80, 81, 82, 83},
+ .oobfree = {
+ {.offset = 2,
+ .length = 10},
+ {.offset = 84,
+ .length = 44}}
+};
+
+static int is_reading;
+
+static void jz_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+ struct nand_chip *this = mtd->priv;
+
+ if (ctrl & NAND_CTRL_CHANGE) {
+ if (ctrl & NAND_ALE)
+ this->IO_ADDR_W = JZ_NAND_ADDR_ADDR;
+ else if (ctrl & NAND_CLE)
+ this->IO_ADDR_W = JZ_NAND_CMD_ADDR;
+ else
+ this->IO_ADDR_W = JZ_NAND_DATA_ADDR;
+
+ if (ctrl & NAND_NCE)
+ writel(readl(EMC_NFCSR) | EMC_NFCSR_NFCE1, EMC_NFCSR);
+ else
+ writel(readl(EMC_NFCSR) & ~EMC_NFCSR_NFCE1, EMC_NFCSR);
+ }
+
+ if (cmd != NAND_CMD_NONE)
+ writeb(cmd, this->IO_ADDR_W);
+}
+
+static int jz_nand_device_ready(struct mtd_info *mtd)
+{
+ udelay(20);
+ return (readl(GPIO_PXPIN(2)) & 0x40000000) ? 1 : 0;
+}
+
+void board_nand_select_device(struct nand_chip *nand, int chip)
+{
+ /*
+ * Don't use "chip" to address the NAND device,
+ * generate the cs from the address where it is encoded.
+ */
+}
+
+static int jz_nand_rs_calculate_ecc(struct mtd_info* mtd, const u_char* dat,
+ u_char* ecc_code)
+{
+ uint32_t status;
+ int i;
+ volatile u8 *paraddr = (volatile u8 *)EMC_NFPAR0;
+
+ if (is_reading)
+ return 0;
+
+ do {
+ status = readl(EMC_NFINTS);
+ } while(!(status & EMC_NFINTS_ENCF));
+
+ /* disable ecc */
+ writel(readl(EMC_NFECR) & ~EMC_NFECR_ECCE, EMC_NFECR);
+
+ for (i = 0; i < 9; i++)
+ ecc_code[i] = *(paraddr + i);
+
+ return 0;
+}
+
+static void jz_nand_hwctl(struct mtd_info* mtd, int mode)
+{
+ uint32_t reg;
+
+ writel(0, EMC_NFINTS);
+ reg = readl(EMC_NFECR);
+ reg |= JZ_NAND_ECC_CTRL_RESET;
+ reg |= JZ_NAND_ECC_CTRL_ENABLE;
+ reg |= JZ_NAND_ECC_CTRL_RS;
+
+ switch (mode) {
+ case NAND_ECC_READ:
+ reg &= ~JZ_NAND_ECC_CTRL_ENCODING;
+ is_reading = 1;
+ break;
+ case NAND_ECC_WRITE:
+ reg |= JZ_NAND_ECC_CTRL_ENCODING;
+ is_reading = 0;
+ break;
+ default:
+ break;
+ }
+
+ writel(reg, EMC_NFECR);
+}
+
+/* Correct 1~9-bit errors in 512-bytes data */
+static void jz_rs_correct(unsigned char *dat, int idx, int mask)
+{
+ int i;
+
+ idx--;
+
+ i = idx + (idx >> 3);
+ if (i >= 512)
+ return;
+
+ mask <<= (idx & 0x7);
+
+ dat[i] ^= mask & 0xff;
+ if (i < 511)
+ dat[i+1] ^= (mask >> 8) & 0xff;
+}
+
+static int jz_nand_rs_correct_data(struct mtd_info *mtd, u_char *dat,
+ u_char *read_ecc, u_char *calc_ecc)
+{
+ int k;
+ uint32_t status;
+ volatile u8 *paraddr = (volatile u8 *)EMC_NFPAR0;
+
+ /* Set PAR values */
+ static uint8_t all_ff_ecc[] = {0xcd, 0x9d, 0x90, 0x58, 0xf4, 0x8b, 0xff, 0xb7, 0x6f};
+ if (read_ecc[0] == 0xff &&
+ read_ecc[1] == 0xff &&
+ read_ecc[2] == 0xff &&
+ read_ecc[3] == 0xff &&
+ read_ecc[4] == 0xff &&
+ read_ecc[5] == 0xff &&
+ read_ecc[6] == 0xff &&
+ read_ecc[7] == 0xff &&
+ read_ecc[8] == 0xff) {
+ for (k = 0; k < 9; k++)
+ *(paraddr + k) = all_ff_ecc[k];
+ } else {
+ for (k = 0; k < 9; k++)
+ *(paraddr + k) = read_ecc[k];
+ }
+ /* Set PRDY */
+ writel(readl(EMC_NFECR) | EMC_NFECR_PRDY, EMC_NFECR);
+
+ /* Wait for completion */
+ do {
+ status = readl(EMC_NFINTS);
+ } while (!(status & EMC_NFINTS_DECF));
+
+ /* disable ecc */
+ writel(readl(EMC_NFECR) & ~EMC_NFECR_ECCE, EMC_NFECR);
+
+ /* Check decoding */
+ if (status & EMC_NFINTS_ERR) {
+ if (status & EMC_NFINTS_UNCOR) {
+ printk("uncorrectable ecc\n");
+ return -1;
+ }
+
+ uint32_t errcnt = (status & EMC_NFINTS_ERRCNT_MASK) >> EMC_NFINTS_ERRCNT_BIT;
+ switch (errcnt) {
+ case 4:
+ jz_rs_correct(dat,
+ (readl(EMC_NFERR3) & EMC_NFERR_INDEX_MASK) >> EMC_NFERR_INDEX_BIT,
+ (readl(EMC_NFERR3) & EMC_NFERR_MASK_MASK) >> EMC_NFERR_MASK_BIT);
+ case 3:
+ jz_rs_correct(dat,
+ (readl(EMC_NFERR2) & EMC_NFERR_INDEX_MASK) >> EMC_NFERR_INDEX_BIT,
+ (readl(EMC_NFERR2) & EMC_NFERR_MASK_MASK) >> EMC_NFERR_MASK_BIT);
+ case 2:
+ jz_rs_correct(dat,
+ (readl(EMC_NFERR1) & EMC_NFERR_INDEX_MASK) >> EMC_NFERR_INDEX_BIT,
+ (readl(EMC_NFERR1) & EMC_NFERR_MASK_MASK) >> EMC_NFERR_MASK_BIT);
+ case 1:
+ jz_rs_correct(dat,
+ (readl(EMC_NFERR0) & EMC_NFERR_INDEX_MASK) >> EMC_NFERR_INDEX_BIT,
+ (readl(EMC_NFERR0) & EMC_NFERR_MASK_MASK) >> EMC_NFERR_MASK_BIT);
+ return errcnt;
+ default:
+ break;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Main initialization routine
+ */
+int board_nand_init(struct nand_chip *nand)
+{
+ uint32_t reg;
+
+ reg = readl(EMC_NFCSR);
+ reg |= EMC_NFCSR_NFE1; /* EMC setup, Set NFE bit */
+ writel(reg, EMC_NFCSR);
+
+ writel(0x094c4400, EMC_SMCR1);
+
+ nand->IO_ADDR_R = JZ_NAND_DATA_ADDR;
+ nand->IO_ADDR_W = JZ_NAND_DATA_ADDR;
+ nand->cmd_ctrl = jz_nand_cmd_ctrl;
+ nand->dev_ready = jz_nand_device_ready;
+
+ nand->ecc.hwctl = jz_nand_hwctl;
+ nand->ecc.correct = jz_nand_rs_correct_data;
+ nand->ecc.calculate = jz_nand_rs_calculate_ecc;
+ nand->ecc.mode = NAND_ECC_HW_OOB_FIRST;
+ nand->ecc.size = CONFIG_SYS_NAND_ECCSIZE;
+ nand->ecc.bytes = CONFIG_SYS_NAND_ECCBYTES;
+ nand->ecc.layout = &qi_lb60_ecclayout_2gb;
+ nand->chip_delay = 50;
+
+ return 0;
+}
+
+#endif /* (CONFIG_CMD_NAND) */
--
1.7.0.4