[PATCH v2] mtd: Add nand support for w90p910
Wan ZongShun
mcuos.com at gmail.com
Wed Jul 22 20:44:15 EDT 2009
Dear David,
What about this patch?
2009/7/10 Wan ZongShun <mcuos.com at gmail.com>:
> Dear David,
>
> I have modified some clock api issue,and resubmitted
> it, marking it as V2.Thanks!
>
> Add w90p910 NAND driver for w90p910 evaluation board
> based on w90p910,there is a K8F1G08 NAND on my board.
>
> Signed-off-by: Wan ZongShun <mcuos.com at gmail.com>
>
> ---
> drivers/mtd/nand/Kconfig | 7 +
> drivers/mtd/nand/Makefile | 1 +
> drivers/mtd/nand/w90p910_nand.c | 382 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 390 insertions(+), 0 deletions(-)
> create mode 100644 drivers/mtd/nand/w90p910_nand.c
>
> diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
> index ce96c09..14201c8 100644
> --- a/drivers/mtd/nand/Kconfig
> +++ b/drivers/mtd/nand/Kconfig
> @@ -452,4 +452,11 @@ config MTD_NAND_SOCRATES
> help
> Enables support for NAND Flash chips wired onto Socrates board.
>
> +config MTD_NAND_W90P910
> + tristate "Support for NAND on w90p910 evaluation board."
> + depends on ARCH_W90X900
> + help
> + This enables the driver for the NAND Flash on evaluation board based
> + on w90p910.
> +
> endif # MTD_NAND
> diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
> index f3a786b..4f7b189 100644
> --- a/drivers/mtd/nand/Makefile
> +++ b/drivers/mtd/nand/Makefile
> @@ -40,5 +40,6 @@ obj-$(CONFIG_MTD_NAND_SH_FLCTL) += sh_flctl.o
> obj-$(CONFIG_MTD_NAND_MXC) += mxc_nand.o
> obj-$(CONFIG_MTD_NAND_SOCRATES) += socrates_nand.o
> obj-$(CONFIG_MTD_NAND_TXX9NDFMC) += txx9ndfmc.o
> +obj-$(CONFIG_MTD_NAND_W90P910) += w90p910_nand.o
>
> nand-objs := nand_base.o nand_bbt.o
> diff --git a/drivers/mtd/nand/w90p910_nand.c b/drivers/mtd/nand/w90p910_nand.c
> new file mode 100644
> index 0000000..7680e73
> --- /dev/null
> +++ b/drivers/mtd/nand/w90p910_nand.c
> @@ -0,0 +1,382 @@
> +/*
> + * Copyright (c) 2009 Nuvoton technology corporation.
> + *
> + * Wan ZongShun <mcuos.com at gmail.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;version 2 of the License.
> + *
> + */
> +
> +#include <linux/slab.h>
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/platform_device.h>
> +#include <linux/delay.h>
> +#include <linux/clk.h>
> +#include <linux/err.h>
> +
> +#include <linux/mtd/mtd.h>
> +#include <linux/mtd/nand.h>
> +#include <linux/mtd/partitions.h>
> +
> +#define REG_FMICSR 0x00
> +#define REG_SMCSR 0xa0
> +#define REG_SMISR 0xac
> +#define REG_SMCMD 0xb0
> +#define REG_SMADDR 0xb4
> +#define REG_SMDATA 0xb8
> +
> +#define RESET_FMI 0x01
> +#define NAND_EN 0x08
> +#define READYBUSY (0x01 << 18)
> +
> +#define SWRST 0x01
> +#define PSIZE (0x01 << 3)
> +#define DMARWEN (0x03 << 1)
> +#define BUSWID (0x01 << 4)
> +#define ECC4EN (0x01 << 5)
> +#define WP (0x01 << 24)
> +#define NANDCS (0x01 << 25)
> +#define ENDADDR (0x01 << 31)
> +
> +#define read_data_reg(dev) \
> + __raw_readl((dev)->reg + REG_SMDATA)
> +
> +#define write_data_reg(dev, val) \
> + __raw_writel((val), (dev)->reg + REG_SMDATA)
> +
> +#define write_cmd_reg(dev, val) \
> + __raw_writel((val), (dev)->reg + REG_SMCMD)
> +
> +#define write_addr_reg(dev, val) \
> + __raw_writel((val), (dev)->reg + REG_SMADDR)
> +
> +struct w90p910_nand {
> + struct mtd_info mtd;
> + struct nand_chip chip;
> + void __iomem *reg;
> + struct clk *clk;
> + spinlock_t lock;
> +};
> +
> +static const struct mtd_partition partitions[] = {
> + {
> + .name = "NAND FS 0",
> + .offset = 0,
> + .size = 8 * 1024 * 1024
> + },
> + {
> + .name = "NAND FS 1",
> + .offset = MTDPART_OFS_APPEND,
> + .size = MTDPART_SIZ_FULL
> + }
> +};
> +
> +static unsigned char w90p910_nand_read_byte(struct mtd_info *mtd)
> +{
> + unsigned char ret;
> + struct w90p910_nand *nand;
> +
> + nand = container_of(mtd, struct w90p910_nand, mtd);
> +
> + ret = (unsigned char)read_data_reg(nand);
> +
> + return ret;
> +}
> +
> +static void w90p910_nand_read_buf(struct mtd_info *mtd,
> + unsigned char *buf, int len)
> +{
> + int i;
> + struct w90p910_nand *nand;
> +
> + nand = container_of(mtd, struct w90p910_nand, mtd);
> +
> + for (i = 0; i < len; i++)
> + buf[i] = (unsigned char)read_data_reg(nand);
> +}
> +
> +static void w90p910_nand_write_buf(struct mtd_info *mtd,
> + const unsigned char *buf, int len)
> +{
> + int i;
> + struct w90p910_nand *nand;
> +
> + nand = container_of(mtd, struct w90p910_nand, mtd);
> +
> + for (i = 0; i < len; i++)
> + write_data_reg(nand, buf[i]);
> +}
> +
> +static int w90p910_verify_buf(struct mtd_info *mtd,
> + const unsigned char *buf, int len)
> +{
> + int i;
> + struct w90p910_nand *nand;
> +
> + nand = container_of(mtd, struct w90p910_nand, mtd);
> +
> + for (i = 0; i < len; i++) {
> + if (buf[i] != (unsigned char)read_data_reg(nand))
> + return -EFAULT;
> + }
> +
> + return 0;
> +}
> +
> +static int w90p910_check_rb(struct w90p910_nand *nand)
> +{
> + unsigned int val;
> + spin_lock(&nand->lock);
> + val = __raw_readl(REG_SMISR);
> + val &= READYBUSY;
> + spin_unlock(&nand->lock);
> +
> + return val;
> +}
> +
> +static int w90p910_nand_devready(struct mtd_info *mtd)
> +{
> + struct w90p910_nand *nand;
> + int ready;
> +
> + nand = container_of(mtd, struct w90p910_nand, mtd);
> +
> + ready = (w90p910_check_rb(nand)) ? 1 : 0;
> + return ready;
> +}
> +
> +static void w90p910_nand_command_lp(struct mtd_info *mtd,
> + unsigned int command, int column, int page_addr)
> +{
> + register struct nand_chip *chip = mtd->priv;
> + struct w90p910_nand *nand;
> +
> + nand = container_of(mtd, struct w90p910_nand, mtd);
> +
> + if (command == NAND_CMD_READOOB) {
> + column += mtd->writesize;
> + command = NAND_CMD_READ0;
> + }
> +
> + write_cmd_reg(nand, command & 0xff);
> +
> + if (column != -1 || page_addr != -1) {
> +
> + if (column != -1) {
> + if (chip->options & NAND_BUSWIDTH_16)
> + column >>= 1;
> + write_addr_reg(nand, column);
> + write_addr_reg(nand, column >> 8 | ENDADDR);
> + }
> + if (page_addr != -1) {
> + write_addr_reg(nand, page_addr);
> +
> + if (chip->chipsize > (128 << 20)) {
> + write_addr_reg(nand, page_addr >> 8);
> + write_addr_reg(nand, page_addr >> 16 | ENDADDR);
> + } else {
> + write_addr_reg(nand, page_addr >> 8 | ENDADDR);
> + }
> + }
> + }
> +
> + switch (command) {
> + case NAND_CMD_CACHEDPROG:
> + case NAND_CMD_PAGEPROG:
> + case NAND_CMD_ERASE1:
> + case NAND_CMD_ERASE2:
> + case NAND_CMD_SEQIN:
> + case NAND_CMD_RNDIN:
> + case NAND_CMD_STATUS:
> + case NAND_CMD_DEPLETE1:
> + return;
> +
> + case NAND_CMD_STATUS_ERROR:
> + case NAND_CMD_STATUS_ERROR0:
> + case NAND_CMD_STATUS_ERROR1:
> + case NAND_CMD_STATUS_ERROR2:
> + case NAND_CMD_STATUS_ERROR3:
> + udelay(chip->chip_delay);
> + return;
> +
> + case NAND_CMD_RESET:
> + if (chip->dev_ready)
> + break;
> + udelay(chip->chip_delay);
> +
> + write_cmd_reg(nand, NAND_CMD_STATUS);
> + write_cmd_reg(nand, command);
> +
> + while (!w90p910_check_rb(nand))
> + ;
> +
> + return;
> +
> + case NAND_CMD_RNDOUT:
> + write_cmd_reg(nand, NAND_CMD_RNDOUTSTART);
> + return;
> +
> + case NAND_CMD_READ0:
> +
> + write_cmd_reg(nand, NAND_CMD_READSTART);
> + default:
> +
> + if (!chip->dev_ready) {
> + udelay(chip->chip_delay);
> + return;
> + }
> + }
> +
> + /* Apply this short delay always to ensure that we do wait tWB in
> + * any case on any machine. */
> + ndelay(100);
> +
> + while (!chip->dev_ready(mtd))
> + ;
> +}
> +
> +
> +static void w90p910_nand_enable(struct w90p910_nand *nand)
> +{
> + unsigned int val;
> + spin_lock(&nand->lock);
> + __raw_writel(RESET_FMI, (nand->reg + REG_FMICSR));
> +
> + val = __raw_readl(nand->reg + REG_FMICSR);
> +
> + if (!(val & NAND_EN))
> + __raw_writel(val | NAND_EN, REG_FMICSR);
> +
> + val = __raw_readl(nand->reg + REG_SMCSR);
> +
> + val &= ~(SWRST|PSIZE|DMARWEN|BUSWID|ECC4EN|NANDCS);
> + val |= WP;
> +
> + __raw_writel(val, nand->reg + REG_SMCSR);
> +
> + spin_unlock(&nand->lock);
> +}
> +
> +static int __devinit w90p910_nand_probe(struct platform_device *pdev)
> +{
> + struct w90p910_nand *w90p910_nand;
> + struct nand_chip *chip;
> + int retval;
> + struct resource *res;
> +
> + retval = 0;
> +
> + w90p910_nand = kzalloc(sizeof(struct w90p910_nand), GFP_KERNEL);
> + if (!w90p910_nand)
> + return -ENOMEM;
> + chip = &(w90p910_nand->chip);
> +
> + w90p910_nand->mtd.priv = chip;
> + w90p910_nand->mtd.owner = THIS_MODULE;
> + spin_lock_init(&w90p910_nand->lock);
> +
> + w90p910_nand->clk = clk_get(&pdev->dev, NULL);
> + if (IS_ERR(w90p910_nand->clk)) {
> + retval = -ENOENT;
> + goto fail1;
> + }
> + clk_enable(w90p910_nand->clk);
> +
> + chip->cmdfunc = w90p910_nand_command_lp;
> + chip->dev_ready = w90p910_nand_devready;
> + chip->read_byte = w90p910_nand_read_byte;
> + chip->write_buf = w90p910_nand_write_buf;
> + chip->read_buf = w90p910_nand_read_buf;
> + chip->verify_buf = w90p910_verify_buf;
> + chip->chip_delay = 50;
> + chip->options = 0;
> + chip->ecc.mode = NAND_ECC_SOFT;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + retval = -ENXIO;
> + goto fail1;
> + }
> +
> + if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
> + retval = -EBUSY;
> + goto fail1;
> + }
> +
> + w90p910_nand->reg = ioremap(res->start, resource_size(res));
> + if (!w90p910_nand->reg) {
> + retval = -ENOMEM;
> + goto fail2;
> + }
> +
> + w90p910_nand_enable(w90p910_nand);
> +
> + if (nand_scan(&(w90p910_nand->mtd), 1)) {
> + retval = -ENXIO;
> + goto fail3;
> + }
> +
> + add_mtd_partitions(&(w90p910_nand->mtd), partitions,
> + ARRAY_SIZE(partitions));
> +
> + platform_set_drvdata(pdev, w90p910_nand);
> +
> + return retval;
> +
> +fail3: iounmap(w90p910_nand->reg);
> +fail2: release_mem_region(res->start, resource_size(res));
> +fail1: kfree(w90p910_nand);
> + return retval;
> +}
> +
> +static int __devexit w90p910_nand_remove(struct platform_device *pdev)
> +{
> + struct w90p910_nand *w90p910_nand = platform_get_drvdata(pdev);
> + struct resource *res;
> +
> + iounmap(w90p910_nand->reg);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + release_mem_region(res->start, resource_size(res));
> +
> + clk_disable(w90p910_nand->clk);
> + clk_put(w90p910_nand->clk);
> +
> + kfree(w90p910_nand);
> +
> + platform_set_drvdata(pdev, NULL);
> +
> + return 0;
> +}
> +
> +static struct platform_driver w90p910_nand_driver = {
> + .probe = w90p910_nand_probe,
> + .remove = __devexit_p(w90p910_nand_remove),
> + .driver = {
> + .name = "w90p910-fmi",
> + .owner = THIS_MODULE,
> + },
> +};
> +
> +static int __init w90p910_nand_init(void)
> +{
> + return platform_driver_register(&w90p910_nand_driver);
> +}
> +
> +static void __exit w90p910_nand_exit(void)
> +{
> + platform_driver_unregister(&w90p910_nand_driver);
> +}
> +
> +module_init(w90p910_nand_init);
> +module_exit(w90p910_nand_exit);
> +
> +MODULE_AUTHOR("Wan ZongShun <mcuos.com at gmail.com>");
> +MODULE_DESCRIPTION("w90p910 nand driver!");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:w90p910-fmi");
> --
> 1.5.6.3
>
--
Wan z.s
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