diff options
Diffstat (limited to 'drivers/mtd/nand/fsl_upm.c')
| -rw-r--r-- | drivers/mtd/nand/fsl_upm.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/drivers/mtd/nand/fsl_upm.c b/drivers/mtd/nand/fsl_upm.c new file mode 100644 index 000000000..5cc410a5e --- /dev/null +++ b/drivers/mtd/nand/fsl_upm.c @@ -0,0 +1,201 @@ +/* + * FSL UPM NAND driver + * + * Copyright (C) 2007 MontaVista Software, Inc. + * Anton Vorontsov <avorontsov@ru.mvista.com> + * + * 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 <config.h> + +#if defined(CONFIG_CMD_NAND) && defined(CONFIG_NAND_FSL_UPM) +#include <common.h> +#include <asm/io.h> +#include <asm/errno.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/fsl_upm.h> +#include <nand.h> + +#define FSL_UPM_MxMR_OP_NO (0 << 28) /* normal operation */ +#define FSL_UPM_MxMR_OP_WA (1 << 28) /* write array */ +#define FSL_UPM_MxMR_OP_RA (2 << 28) /* read array */ +#define FSL_UPM_MxMR_OP_RP (3 << 28) /* run pattern */ + +static void fsl_upm_start_pattern(struct fsl_upm *upm, u32 pat_offset) +{ + out_be32(upm->mxmr, FSL_UPM_MxMR_OP_RP | pat_offset); +} + +static void fsl_upm_end_pattern(struct fsl_upm *upm) +{ + out_be32(upm->mxmr, FSL_UPM_MxMR_OP_NO); + while (in_be32(upm->mxmr) != FSL_UPM_MxMR_OP_NO) + eieio(); +} + +static void fsl_upm_run_pattern(struct fsl_upm *upm, int width, u32 cmd) +{ + out_be32(upm->mar, cmd << (32 - width * 8)); + out_8(upm->io_addr, 0x0); +} + +static void fsl_upm_setup(struct fsl_upm *upm) +{ + int i; + + /* write upm array */ + out_be32(upm->mxmr, FSL_UPM_MxMR_OP_WA); + + for (i = 0; i < 64; i++) { + out_be32(upm->mdr, upm->array[i]); + out_8(upm->io_addr, 0x0); + } + + /* normal operation */ + out_be32(upm->mxmr, FSL_UPM_MxMR_OP_NO); + while (in_be32(upm->mxmr) != FSL_UPM_MxMR_OP_NO) + eieio(); +} + +static void fun_cmdfunc(struct mtd_info *mtd, unsigned command, int column, + int page_addr) +{ + struct nand_chip *chip = mtd->priv; + struct fsl_upm_nand *fun = chip->priv; + + fsl_upm_start_pattern(&fun->upm, fun->upm_cmd_offset); + + if (command == NAND_CMD_SEQIN) { + int readcmd; + + if (column >= mtd->oobblock) { + /* OOB area */ + column -= mtd->oobblock; + readcmd = NAND_CMD_READOOB; + } else if (column < 256) { + /* First 256 bytes --> READ0 */ + readcmd = NAND_CMD_READ0; + } else { + column -= 256; + readcmd = NAND_CMD_READ1; + } + fsl_upm_run_pattern(&fun->upm, fun->width, readcmd); + } + + fsl_upm_run_pattern(&fun->upm, fun->width, command); + + fsl_upm_end_pattern(&fun->upm); + + fsl_upm_start_pattern(&fun->upm, fun->upm_addr_offset); + + if (column != -1) + fsl_upm_run_pattern(&fun->upm, fun->width, column); + + if (page_addr != -1) { + fsl_upm_run_pattern(&fun->upm, fun->width, page_addr); + fsl_upm_run_pattern(&fun->upm, fun->width, + (page_addr >> 8) & 0xFF); + if (chip->chipsize > (32 << 20)) { + fsl_upm_run_pattern(&fun->upm, fun->width, + (page_addr >> 16) & 0x0f); + } + } + + fsl_upm_end_pattern(&fun->upm); + + if (fun->wait_pattern) { + /* + * Some boards/chips needs this. At least on MPC8360E-RDK we + * need it. Probably weird chip, because I don't see any need + * for this on MPC8555E + Samsung K9F1G08U0A. Usually here are + * 0-2 unexpected busy states per block read. + */ + while (!fun->dev_ready()) + debug("unexpected busy state\n"); + } +} + +static void nand_write_byte(struct mtd_info *mtd, u_char byte) +{ + struct nand_chip *chip = mtd->priv; + + out_8(chip->IO_ADDR_W, byte); +} + +static u8 nand_read_byte(struct mtd_info *mtd) +{ + struct nand_chip *chip = mtd->priv; + + return in_8(chip->IO_ADDR_R); +} + +static void nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len) +{ + int i; + struct nand_chip *chip = mtd->priv; + + for (i = 0; i < len; i++) + out_8(chip->IO_ADDR_W, buf[i]); +} + +static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len) +{ + int i; + struct nand_chip *chip = mtd->priv; + + for (i = 0; i < len; i++) + buf[i] = in_8(chip->IO_ADDR_R); +} + +static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len) +{ + int i; + struct nand_chip *chip = mtd->priv; + + for (i = 0; i < len; i++) { + if (buf[i] != in_8(chip->IO_ADDR_R)) + return -EFAULT; + } + + return 0; +} + +static void nand_hwcontrol(struct mtd_info *mtd, int cmd) +{ +} + +static int nand_dev_ready(struct mtd_info *mtd) +{ + struct nand_chip *chip = mtd->priv; + struct fsl_upm_nand *fun = chip->priv; + + return fun->dev_ready(); +} + +int fsl_upm_nand_init(struct nand_chip *chip, struct fsl_upm_nand *fun) +{ + /* yet only 8 bit accessors implemented */ + if (fun->width != 1) + return -ENOSYS; + + fsl_upm_setup(&fun->upm); + + chip->priv = fun; + chip->chip_delay = fun->chip_delay; + chip->eccmode = NAND_ECC_SOFT; + chip->cmdfunc = fun_cmdfunc; + chip->hwcontrol = nand_hwcontrol; + chip->read_byte = nand_read_byte; + chip->read_buf = nand_read_buf; + chip->write_byte = nand_write_byte; + chip->write_buf = nand_write_buf; + chip->verify_buf = nand_verify_buf; + chip->dev_ready = nand_dev_ready; + + return 0; +} +#endif /* CONFIG_CMD_NAND */ |