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Diffstat (limited to 'u-boot/board/socrates/nand.c')
| -rw-r--r-- | u-boot/board/socrates/nand.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/u-boot/board/socrates/nand.c b/u-boot/board/socrates/nand.c new file mode 100644 index 0000000..7d76f42 --- /dev/null +++ b/u-boot/board/socrates/nand.c @@ -0,0 +1,198 @@ +/* + * (C) Copyright 2008 + * Sergei Poselenov, Emcraft Systems, sposelenov@emcraft.com. + * + * 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> + +#if defined(CONFIG_SYS_NAND_BASE) +#include <nand.h> +#include <asm/errno.h> +#include <asm/io.h> + +static int state; +static void nand_write_byte(struct mtd_info *mtd, u_char byte); +static void nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len); +static u_char nand_read_byte(struct mtd_info *mtd); +static u16 nand_read_word(struct mtd_info *mtd); +static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len); +static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len); +static int nand_device_ready(struct mtd_info *mtdinfo); + +#define FPGA_NAND_CMD_MASK (0x7 << 28) +#define FPGA_NAND_CMD_COMMAND (0x0 << 28) +#define FPGA_NAND_CMD_ADDR (0x1 << 28) +#define FPGA_NAND_CMD_READ (0x2 << 28) +#define FPGA_NAND_CMD_WRITE (0x3 << 28) +#define FPGA_NAND_BUSY (0x1 << 15) +#define FPGA_NAND_ENABLE (0x1 << 31) +#define FPGA_NAND_DATA_SHIFT 16 + +/** + * nand_write_byte - write one byte to the chip + * @mtd: MTD device structure + * @byte: pointer to data byte to write + */ +static void nand_write_byte(struct mtd_info *mtd, u_char byte) +{ + nand_write_buf(mtd, (const uchar *)&byte, sizeof(byte)); +} + +/** + * nand_write_buf - write buffer to chip + * @mtd: MTD device structure + * @buf: data buffer + * @len: number of bytes to write + */ +static void nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len) +{ + int i; + struct nand_chip *this = mtd->priv; + + for (i = 0; i < len; i++) { + out_be32(this->IO_ADDR_W, + state | (buf[i] << FPGA_NAND_DATA_SHIFT)); + } +} + + +/** + * nand_read_byte - read one byte from the chip + * @mtd: MTD device structure + */ +static u_char nand_read_byte(struct mtd_info *mtd) +{ + u8 byte; + nand_read_buf(mtd, (uchar *)&byte, sizeof(byte)); + return byte; +} + +/** + * nand_read_word - read one word from the chip + * @mtd: MTD device structure + */ +static u16 nand_read_word(struct mtd_info *mtd) +{ + u16 word; + nand_read_buf(mtd, (uchar *)&word, sizeof(word)); + return word; +} + +/** + * nand_read_buf - read chip data into buffer + * @mtd: MTD device structure + * @buf: buffer to store date + * @len: number of bytes to read + */ +static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len) +{ + int i; + struct nand_chip *this = mtd->priv; + int val; + + val = (state & FPGA_NAND_ENABLE) | FPGA_NAND_CMD_READ; + + out_be32(this->IO_ADDR_W, val); + for (i = 0; i < len; i++) { + buf[i] = (in_be32(this->IO_ADDR_R) >> FPGA_NAND_DATA_SHIFT) & 0xff; + } +} + +/** + * nand_verify_buf - Verify chip data against buffer + * @mtd: MTD device structure + * @buf: buffer containing the data to compare + * @len: number of bytes to compare + */ +static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len) +{ + int i; + + for (i = 0; i < len; i++) { + if (buf[i] != nand_read_byte(mtd)); + return -EFAULT; + } + return 0; +} + +/** + * nand_device_ready - Check the NAND device is ready for next command. + * @mtd: MTD device structure + */ +static int nand_device_ready(struct mtd_info *mtdinfo) +{ + struct nand_chip *this = mtdinfo->priv; + + if (in_be32(this->IO_ADDR_W) & FPGA_NAND_BUSY) + return 0; /* busy */ + return 1; +} + +/** + * nand_hwcontrol - NAND control functions wrapper. + * @mtd: MTD device structure + * @cmd: Command + */ +static void nand_hwcontrol(struct mtd_info *mtdinfo, int cmd, unsigned int ctrl) +{ + if (ctrl & NAND_CTRL_CHANGE) { + state &= ~(FPGA_NAND_CMD_MASK | FPGA_NAND_ENABLE); + + switch (ctrl & (NAND_ALE | NAND_CLE)) { + case 0: + state |= FPGA_NAND_CMD_WRITE; + break; + + case NAND_ALE: + state |= FPGA_NAND_CMD_ADDR; + break; + + case NAND_CLE: + state |= FPGA_NAND_CMD_COMMAND; + break; + + default: + printf("%s: unknown ctrl %#x\n", __FUNCTION__, ctrl); + } + + if (ctrl & NAND_NCE) + state |= FPGA_NAND_ENABLE; + } + + if (cmd != NAND_CMD_NONE) + nand_write_byte(mtdinfo, cmd); +} + +int board_nand_init(struct nand_chip *nand) +{ + nand->cmd_ctrl = nand_hwcontrol; + nand->ecc.mode = NAND_ECC_SOFT; + nand->dev_ready = nand_device_ready; + nand->read_byte = nand_read_byte; + nand->read_word = nand_read_word; + nand->write_buf = nand_write_buf; + nand->read_buf = nand_read_buf; + nand->verify_buf = nand_verify_buf; + + return 0; +} + +#endif |