[U-Boot-Users] [PATCH 6/7 v3] NAND: add NAND driver for s3c64xx
Guennadi Liakhovetski
lg at denx.de
Mon Aug 4 14:46:15 CEST 2008
Ported from u-boot-1.1.6 driver by Samsung.
Signed-off-by: Guennadi Liakhovetski <lg at denx.de>
---
drivers/mtd/nand/Makefile | 1 +
drivers/mtd/nand/s3c64xx.c | 307 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 308 insertions(+), 0 deletions(-)
create mode 100644 drivers/mtd/nand/s3c64xx.c
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 7bd22a0..236cf03 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -33,6 +33,7 @@ COBJS-y += nand_bbt.o
COBJS-y += nand_util.o
COBJS-y += fsl_upm.o
+COBJS-$(CONFIG_NAND_S3C64XX) += s3c64xx.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
diff --git a/drivers/mtd/nand/s3c64xx.c b/drivers/mtd/nand/s3c64xx.c
new file mode 100644
index 0000000..162ec26
--- /dev/null
+++ b/drivers/mtd/nand/s3c64xx.c
@@ -0,0 +1,307 @@
+/*
+ * (C) Copyright 2006 DENX Software Engineering
+ *
+ * Implementation for U-Boot 1.1.6 by Samsung
+ *
+ * (C) Copyright 2008
+ * Guennadi Liakhovetki, DENX Software Engineering, <lg at denx.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+
+#include <nand.h>
+#include <s3c6400.h>
+
+#include <asm/io.h>
+
+#ifdef CONFIG_NAND_SPL
+#define printf(arg...) do {} while (0)
+#endif
+
+/* Nand flash definition values by jsgood */
+#ifdef S3C_NAND_DEBUG
+/*
+ * Function to print out oob buffer for debugging
+ * Written by jsgood
+ */
+static void print_oob(const char *header, struct mtd_info *mtd)
+{
+ int i;
+ struct nand_chip *chip = mtd->priv;
+
+ printf("%s:\t", header);
+
+ for (i = 0; i < 64; i++)
+ printf("%02x ", chip->oob_poi[i]);
+
+ printf("\n");
+}
+#endif /* S3C_NAND_DEBUG */
+
+#ifdef CONFIG_NAND_SPL
+static u_char nand_read_byte(struct mtd_info *mtd)
+{
+ struct nand_chip *this = mtd->priv;
+ return readb(this->IO_ADDR_R);
+}
+
+static void nand_write_byte(struct mtd_info *mtd, u_char byte)
+{
+ struct nand_chip *this = mtd->priv;
+ writeb(byte, this->IO_ADDR_W);
+}
+
+static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
+{
+ int i;
+ struct nand_chip *this = mtd->priv;
+
+ for (i = 0; i < len; i++)
+ buf[i] = readb(this->IO_ADDR_R);
+}
+#endif
+
+static void s3c_nand_select_chip(struct mtd_info *mtd, int chip)
+{
+ int ctrl = readl(NFCONT);
+
+ switch (chip) {
+ case -1:
+ ctrl |= 6;
+ break;
+ case 0:
+ ctrl &= ~2;
+ break;
+ case 1:
+ ctrl &= ~4;
+ break;
+ default:
+ return;
+ }
+
+ writel(ctrl, NFCONT);
+}
+
+/*
+ * Hardware specific access to control-lines function
+ * Written by jsgood
+ */
+static void s3c_nand_hwcontrol(struct mtd_info *mtd, int cmd)
+{
+ struct nand_chip *this = mtd->priv;
+
+ switch (cmd) {
+ case NAND_CTL_SETCLE:
+ this->IO_ADDR_W = (void __iomem *)NFCMMD;
+ break;
+ case NAND_CTL_CLRCLE:
+ this->IO_ADDR_W = (void __iomem *)NFDATA;
+ break;
+ case NAND_CTL_SETALE:
+ this->IO_ADDR_W = (void __iomem *)NFADDR;
+ break;
+ case NAND_CTL_CLRALE:
+ this->IO_ADDR_W = (void __iomem *)NFDATA;
+ break;
+ case NAND_CTL_SETNCE:
+ s3c_nand_select_chip(mtd, 0);
+ break;
+ case NAND_CTL_CLRNCE:
+ s3c_nand_select_chip(mtd, -1);
+ break;
+ }
+}
+
+/*
+ * Function for checking device ready pin
+ * Written by jsgood
+ */
+static int s3c_nand_device_ready(struct mtd_info *mtdinfo)
+{
+ while (!(readl(NFSTAT) & NFSTAT_RnB)) {}
+ return 1;
+}
+
+#ifdef CFG_S3C_NAND_HWECC
+/*
+ * This function is called before encoding ecc codes to ready ecc engine.
+ * Written by jsgood
+ */
+static void s3c_nand_enable_hwecc(struct mtd_info *mtd, int mode)
+{
+ u_long nfcont, nfconf;
+
+ /*
+ * The original driver used 4-bit ECC for "new" MLC chips, i.e., for
+ * those with non-zero ID[3][3:2], which anyway only holds for ST
+ * (Numonyx) chips
+ */
+ nfconf = readl(NFCONF) & ~NFCONF_ECC_4BIT;
+
+ writel(nfconf, NFCONF);
+
+ /* Initialize & unlock */
+ nfcont = readl(NFCONT);
+ nfcont |= NFCONT_INITECC;
+ nfcont &= ~NFCONT_MECCLOCK;
+
+ if (mode == NAND_ECC_WRITE)
+ nfcont |= NFCONT_ECC_ENC;
+ else if (mode == NAND_ECC_READ)
+ nfcont &= ~NFCONT_ECC_ENC;
+
+ writel(nfcont, NFCONT);
+}
+
+/*
+ * This function is called immediately after encoding ecc codes.
+ * This function returns encoded ecc codes.
+ * Written by jsgood
+ */
+static int s3c_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
+ u_char *ecc_code)
+{
+ u_long nfcont, nfmecc0;
+
+ /* Lock */
+ nfcont = readl(NFCONT);
+ nfcont |= NFCONT_MECCLOCK;
+ writel(nfcont, NFCONT);
+
+ nfmecc0 = readl(NFMECC0);
+
+ ecc_code[0] = nfmecc0 & 0xff;
+ ecc_code[1] = (nfmecc0 >> 8) & 0xff;
+ ecc_code[2] = (nfmecc0 >> 16) & 0xff;
+ ecc_code[3] = (nfmecc0 >> 24) & 0xff;
+
+ return 0;
+}
+
+/*
+ * This function determines whether read data is good or not.
+ * If SLC, must write ecc codes to controller before reading status bit.
+ * If MLC, status bit is already set, so only reading is needed.
+ * If status bit is good, return 0.
+ * If correctable errors occured, do that.
+ * If uncorrectable errors occured, return -1.
+ * Written by jsgood
+ */
+static int s3c_nand_correct_data(struct mtd_info *mtd, u_char *dat,
+ u_char *read_ecc, u_char *calc_ecc)
+{
+ int ret = -1;
+ u_long nfestat0, nfmeccdata0, nfmeccdata1, err_byte_addr;
+ u_char err_type, repared;
+
+ /* SLC: Write ecc to compare */
+ nfmeccdata0 = (calc_ecc[1] << 16) | calc_ecc[0];
+ nfmeccdata1 = (calc_ecc[3] << 16) | calc_ecc[2];
+ writel(nfmeccdata0, NFMECCDATA0);
+ writel(nfmeccdata1, NFMECCDATA1);
+
+ /* Read ecc status */
+ nfestat0 = readl(NFESTAT0);
+ err_type = nfestat0 & 0x3;
+
+ switch (err_type) {
+ case 0: /* No error */
+ ret = 0;
+ break;
+
+ case 1:
+ /*
+ * 1 bit error (Correctable)
+ * (nfestat0 >> 7) & 0x7ff :error byte number
+ * (nfestat0 >> 4) & 0x7 :error bit number
+ */
+ err_byte_addr = (nfestat0 >> 7) & 0x7ff;
+ repared = dat[err_byte_addr] ^ (1 << ((nfestat0 >> 4) & 0x7));
+
+ printf("S3C NAND: 1 bit error detected at byte %ld. "
+ "Correcting from 0x%02x to 0x%02x...OK\n",
+ err_byte_addr, dat[err_byte_addr], repared);
+
+ dat[err_byte_addr] = repared;
+
+ ret = 1;
+ break;
+
+ case 2: /* Multiple error */
+ case 3: /* ECC area error */
+ printf("S3C NAND: ECC uncorrectable error detected. "
+ "Not correctable.\n");
+ ret = -1;
+ break;
+ }
+
+ return ret;
+}
+#endif /* CFG_S3C_NAND_HWECC */
+
+/*
+ * Board-specific NAND initialization. The following members of the
+ * argument are board-specific (per include/linux/mtd/nand.h):
+ * - IO_ADDR_R?: address to read the 8 I/O lines of the flash device
+ * - IO_ADDR_W?: address to write the 8 I/O lines of the flash device
+ * - hwcontrol: hardwarespecific function for accesing control-lines
+ * - dev_ready: hardwarespecific function for accesing device ready/busy line
+ * - enable_hwecc?: function to enable (reset) hardware ecc generator. Must
+ * only be provided if a hardware ECC is available
+ * - eccmode: mode of ecc, see defines
+ * - chip_delay: chip dependent delay for transfering data from array to
+ * read regs (tR)
+ * - options: various chip options. They can partly be set to inform
+ * nand_scan about special functionality. See the defines for further
+ * explanation
+ * Members with a "?" were not set in the merged testing-NAND branch,
+ * so they are not set here either.
+ */
+int board_nand_init(struct nand_chip *nand)
+{
+ NFCONT_REG = (NFCONT_REG & ~NFCONT_WP) | NFCONT_ENABLE | 0x6;
+
+ nand->IO_ADDR_R = (void __iomem *)NFDATA;
+ nand->IO_ADDR_W = (void __iomem *)NFDATA;
+ nand->hwcontrol = s3c_nand_hwcontrol;
+ nand->dev_ready = s3c_nand_device_ready;
+ nand->select_chip = s3c_nand_select_chip;
+ nand->options = 0;
+#ifdef CONFIG_NAND_SPL
+ nand->read_byte = nand_read_byte;
+ nand->write_byte = nand_write_byte;
+ nand->read_buf = nand_read_buf;
+#endif
+
+#ifdef CFG_S3C_NAND_HWECC
+ nand->enable_hwecc = s3c_nand_enable_hwecc;
+ nand->calculate_ecc = s3c_nand_calculate_ecc;
+ nand->correct_data = s3c_nand_correct_data;
+
+ /* A shot in the dark, I don't know how to use this smart ECC-mode
+ * selection with the current driver */
+ nand->eccmode = NAND_ECC_HW12_2048;
+#else
+ nand->eccmode = NAND_ECC_SOFT;
+#endif /* ! CFG_S3C_NAND_HWECC */
+
+ return 0;
+}
--
1.5.4
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