--- /dev/null
+/*
+ * 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>
+
+#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)
+
+#define EMC_SMCR1_OPT_NAND 0x094c4400
+/* Optimize the timing of nand */
+
+static struct jz4740_emc * emc = (struct jz4740_emc *)JZ4740_EMC_BASE;
+
+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;
+ uint32_t reg;
+
+ 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;
+
+ reg = readl(&emc->nfcsr);
+ if (ctrl & NAND_NCE)
+ reg |= EMC_NFCSR_NFCE1;
+ else
+ reg &= ~EMC_NFCSR_NFCE1;
+ writel(reg, &emc->nfcsr);
+ }
+
+ if (cmd != NAND_CMD_NONE)
+ writeb(cmd, this->IO_ADDR_W);
+}
+
+static int jz_nand_device_ready(struct mtd_info *mtd)
+{
+ 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;
+
+ 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] = readb(&emc->nfpar[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 errcnt, index, mask, status;
+
+ /* Set PAR values */
+ const 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++)
+ writeb(all_ff_ecc[k], &emc->nfpar[k]);
+ } else {
+ for (k = 0; k < 9; k++)
+ writeb(read_ecc[k], &emc->nfpar[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))
+ return 0;
+
+ if (status & EMC_NFINTS_UNCOR) {
+ printf("uncorrectable ecc\n");
+ return -1;
+ }
+
+ errcnt = (status & EMC_NFINTS_ERRCNT_MASK) >> EMC_NFINTS_ERRCNT_BIT;
+
+ switch (errcnt) {
+ case 4:
+ index = (readl(&emc->nferr[3]) & EMC_NFERR_INDEX_MASK) >>
+ EMC_NFERR_INDEX_BIT;
+ mask = (readl(&emc->nferr[3]) & EMC_NFERR_MASK_MASK) >>
+ EMC_NFERR_MASK_BIT;
+ jz_rs_correct(dat, index, mask);
+ case 3:
+ index = (readl(&emc->nferr[2]) & EMC_NFERR_INDEX_MASK) >>
+ EMC_NFERR_INDEX_BIT;
+ mask = (readl(&emc->nferr[2]) & EMC_NFERR_MASK_MASK) >>
+ EMC_NFERR_MASK_BIT;
+ jz_rs_correct(dat, index, mask);
+ case 2:
+ index = (readl(&emc->nferr[1]) & EMC_NFERR_INDEX_MASK) >>
+ EMC_NFERR_INDEX_BIT;
+ mask = (readl(&emc->nferr[1]) & EMC_NFERR_MASK_MASK) >>
+ EMC_NFERR_MASK_BIT;
+ jz_rs_correct(dat, index, mask);
+ case 1:
+ index = (readl(&emc->nferr[0]) & EMC_NFERR_INDEX_MASK) >>
+ EMC_NFERR_INDEX_BIT;
+ mask = (readl(&emc->nferr[0]) & EMC_NFERR_MASK_MASK) >>
+ EMC_NFERR_MASK_BIT;
+ jz_rs_correct(dat, index, mask);
+ default:
+ break;
+ }
+
+ return errcnt;
+}
+
+/*
+ * 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(EMC_SMCR1_OPT_NAND, &emc->smcr[1]);
+
+ 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;
+ nand->options = NAND_USE_FLASH_BBT;
+
+ return 0;
+}
projects / u-boot.git / commitdiff
