+++ /dev/null
-/*
- * NAND flash driver for the MikroTik RouterBOARD 91x series
- *
- * Copyright (C) 2013-2014 Gabor Juhos <juhosg@openwrt.org>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published
- * by the Free Software Foundation.
- */
-
-#include <linux/version.h>
-#include <linux/kernel.h>
-#include <linux/spinlock.h>
-#include <linux/module.h>
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,14,0)
-#include <linux/mtd/nand.h>
-#else
-#include <linux/mtd/rawnand.h>
-#endif
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/partitions.h>
-#include <linux/platform_device.h>
-#include <linux/io.h>
-#include <linux/slab.h>
-#include <linux/gpio.h>
-#include <linux/platform_data/rb91x_nand.h>
-
-#include <asm/mach-ath79/ar71xx_regs.h>
-#include <asm/mach-ath79/ath79.h>
-
-#define DRV_DESC "NAND flash driver for the RouterBOARD 91x series"
-
-#define RB91X_NAND_NRWE BIT(12)
-
-#define RB91X_NAND_DATA_BITS (BIT(0) | BIT(1) | BIT(2) | BIT(3) | BIT(4) |\
- BIT(13) | BIT(14) | BIT(15))
-
-#define RB91X_NAND_INPUT_BITS (RB91X_NAND_DATA_BITS | RB91X_NAND_RDY)
-#define RB91X_NAND_OUTPUT_BITS (RB91X_NAND_DATA_BITS | RB91X_NAND_NRWE)
-
-#define RB91X_NAND_LOW_DATA_MASK 0x1f
-#define RB91X_NAND_HIGH_DATA_MASK 0xe0
-#define RB91X_NAND_HIGH_DATA_SHIFT 8
-
-struct rb91x_nand_info {
- struct nand_chip chip;
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
- struct mtd_info mtd;
-#endif
- struct device *dev;
-
- int gpio_nce;
- int gpio_ale;
- int gpio_cle;
- int gpio_rdy;
- int gpio_read;
- int gpio_nrw;
- int gpio_nle;
-};
-
-static inline struct rb91x_nand_info *mtd_to_rbinfo(struct mtd_info *mtd)
-{
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
- return container_of(mtd, struct rb91x_nand_info, mtd);
-#else
- struct nand_chip *chip = mtd_to_nand(mtd);
-
- return container_of(chip, struct rb91x_nand_info, chip);
-#endif
-}
-
-static struct mtd_info *rbinfo_to_mtd(struct rb91x_nand_info *nfc)
-{
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
- return &nfc->mtd;
-#else
- return nand_to_mtd(&nfc->chip);
-#endif
-}
-
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
-/*
- * We need to use the OLD Yaffs-1 OOB layout, otherwise the RB bootloader
- * will not be able to find the kernel that we load.
- */
-static struct nand_ecclayout rb91x_nand_ecclayout = {
- .eccbytes = 6,
- .eccpos = { 8, 9, 10, 13, 14, 15 },
- .oobavail = 9,
- .oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } }
-};
-
-#else
-
-static int rb91x_ooblayout_ecc(struct mtd_info *mtd, int section,
- struct mtd_oob_region *oobregion)
-{
- switch (section) {
- case 0:
- oobregion->offset = 8;
- oobregion->length = 3;
- return 0;
- case 1:
- oobregion->offset = 13;
- oobregion->length = 3;
- return 0;
- default:
- return -ERANGE;
- }
-}
-
-static int rb91x_ooblayout_free(struct mtd_info *mtd, int section,
- struct mtd_oob_region *oobregion)
-{
- switch (section) {
- case 0:
- oobregion->offset = 0;
- oobregion->length = 4;
- return 0;
- case 1:
- oobregion->offset = 4;
- oobregion->length = 1;
- return 0;
- case 2:
- oobregion->offset = 6;
- oobregion->length = 2;
- return 0;
- case 3:
- oobregion->offset = 11;
- oobregion->length = 2;
- return 0;
- default:
- return -ERANGE;
- }
-}
-
-static const struct mtd_ooblayout_ops rb91x_nand_ecclayout_ops = {
- .ecc = rb91x_ooblayout_ecc,
- .free = rb91x_ooblayout_free,
-};
-#endif /* < 4.6 */
-
-static struct mtd_partition rb91x_nand_partitions[] = {
- {
- .name = "booter",
- .offset = 0,
- .size = (256 * 1024),
- .mask_flags = MTD_WRITEABLE,
- }, {
- .name = "kernel",
- .offset = (256 * 1024),
- .size = (4 * 1024 * 1024) - (256 * 1024),
- }, {
- .name = "ubi",
- .offset = MTDPART_OFS_NXTBLK,
- .size = MTDPART_SIZ_FULL,
- },
-};
-
-static void rb91x_nand_write(struct rb91x_nand_info *rbni,
- const u8 *buf,
- unsigned len)
-{
- void __iomem *base = ath79_gpio_base;
- u32 oe_reg;
- u32 out_reg;
- u32 out;
- unsigned i;
-
- /* enable the latch */
- gpio_set_value_cansleep(rbni->gpio_nle, 0);
-
- oe_reg = __raw_readl(base + AR71XX_GPIO_REG_OE);
- out_reg = __raw_readl(base + AR71XX_GPIO_REG_OUT);
-
- /* set data lines to output mode */
- __raw_writel(oe_reg & ~(RB91X_NAND_DATA_BITS | RB91X_NAND_NRWE),
- base + AR71XX_GPIO_REG_OE);
-
- out = out_reg & ~(RB91X_NAND_DATA_BITS | RB91X_NAND_NRWE);
- for (i = 0; i != len; i++) {
- u32 data;
-
- data = (buf[i] & RB91X_NAND_HIGH_DATA_MASK) <<
- RB91X_NAND_HIGH_DATA_SHIFT;
- data |= buf[i] & RB91X_NAND_LOW_DATA_MASK;
- data |= out;
- __raw_writel(data, base + AR71XX_GPIO_REG_OUT);
-
- /* deactivate WE line */
- data |= RB91X_NAND_NRWE;
- __raw_writel(data, base + AR71XX_GPIO_REG_OUT);
- /* flush write */
- __raw_readl(base + AR71XX_GPIO_REG_OUT);
- }
-
- /* restore registers */
- __raw_writel(out_reg, base + AR71XX_GPIO_REG_OUT);
- __raw_writel(oe_reg, base + AR71XX_GPIO_REG_OE);
- /* flush write */
- __raw_readl(base + AR71XX_GPIO_REG_OUT);
-
- /* disable the latch */
- gpio_set_value_cansleep(rbni->gpio_nle, 1);
-}
-
-static void rb91x_nand_read(struct rb91x_nand_info *rbni,
- u8 *read_buf,
- unsigned len)
-{
- void __iomem *base = ath79_gpio_base;
- u32 oe_reg;
- u32 out_reg;
- unsigned i;
-
- /* enable read mode */
- gpio_set_value_cansleep(rbni->gpio_read, 1);
-
- /* enable latch */
- gpio_set_value_cansleep(rbni->gpio_nle, 0);
-
- /* save registers */
- oe_reg = __raw_readl(base + AR71XX_GPIO_REG_OE);
- out_reg = __raw_readl(base + AR71XX_GPIO_REG_OUT);
-
- /* set data lines to input mode */
- __raw_writel(oe_reg | RB91X_NAND_DATA_BITS,
- base + AR71XX_GPIO_REG_OE);
-
- for (i = 0; i < len; i++) {
- u32 in;
- u8 data;
-
- /* activate RE line */
- __raw_writel(RB91X_NAND_NRWE, base + AR71XX_GPIO_REG_CLEAR);
- /* flush write */
- __raw_readl(base + AR71XX_GPIO_REG_CLEAR);
-
- /* read input lines */
- in = __raw_readl(base + AR71XX_GPIO_REG_IN);
-
- /* deactivate RE line */
- __raw_writel(RB91X_NAND_NRWE, base + AR71XX_GPIO_REG_SET);
-
- data = (in & RB91X_NAND_LOW_DATA_MASK);
- data |= (in >> RB91X_NAND_HIGH_DATA_SHIFT) &
- RB91X_NAND_HIGH_DATA_MASK;
-
- read_buf[i] = data;
- }
-
- /* restore registers */
- __raw_writel(out_reg, base + AR71XX_GPIO_REG_OUT);
- __raw_writel(oe_reg, base + AR71XX_GPIO_REG_OE);
- /* flush write */
- __raw_readl(base + AR71XX_GPIO_REG_OUT);
-
- /* disable latch */
- gpio_set_value_cansleep(rbni->gpio_nle, 1);
-
- /* disable read mode */
- gpio_set_value_cansleep(rbni->gpio_read, 0);
-}
-
-static int rb91x_nand_dev_ready(struct mtd_info *mtd)
-{
- struct rb91x_nand_info *rbni = mtd_to_rbinfo(mtd);
-
- return gpio_get_value_cansleep(rbni->gpio_rdy);
-}
-
-static void rb91x_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
- unsigned int ctrl)
-{
- struct rb91x_nand_info *rbni = mtd_to_rbinfo(mtd);
-
- if (ctrl & NAND_CTRL_CHANGE) {
- gpio_set_value_cansleep(rbni->gpio_cle,
- (ctrl & NAND_CLE) ? 1 : 0);
- gpio_set_value_cansleep(rbni->gpio_ale,
- (ctrl & NAND_ALE) ? 1 : 0);
- gpio_set_value_cansleep(rbni->gpio_nce,
- (ctrl & NAND_NCE) ? 0 : 1);
- }
-
- if (cmd != NAND_CMD_NONE) {
- u8 t = cmd;
-
- rb91x_nand_write(rbni, &t, 1);
- }
-}
-
-static u8 rb91x_nand_read_byte(struct mtd_info *mtd)
-{
- struct rb91x_nand_info *rbni = mtd_to_rbinfo(mtd);
- u8 data = 0xff;
-
- rb91x_nand_read(rbni, &data, 1);
-
- return data;
-}
-
-static void rb91x_nand_read_buf(struct mtd_info *mtd, u8 *buf, int len)
-{
- struct rb91x_nand_info *rbni = mtd_to_rbinfo(mtd);
-
- rb91x_nand_read(rbni, buf, len);
-}
-
-static void rb91x_nand_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
-{
- struct rb91x_nand_info *rbni = mtd_to_rbinfo(mtd);
-
- rb91x_nand_write(rbni, buf, len);
-}
-
-static int rb91x_nand_gpio_init(struct rb91x_nand_info *info)
-{
- int ret;
-
- /*
- * Ensure that the LATCH is disabled before initializing
- * control lines.
- */
- ret = devm_gpio_request_one(info->dev, info->gpio_nle,
- GPIOF_OUT_INIT_HIGH, "LATCH enable");
- if (ret)
- return ret;
-
- ret = devm_gpio_request_one(info->dev, info->gpio_nce,
- GPIOF_OUT_INIT_HIGH, "NAND nCE");
- if (ret)
- return ret;
-
- ret = devm_gpio_request_one(info->dev, info->gpio_nrw,
- GPIOF_OUT_INIT_HIGH, "NAND nRW");
- if (ret)
- return ret;
-
- ret = devm_gpio_request_one(info->dev, info->gpio_cle,
- GPIOF_OUT_INIT_LOW, "NAND CLE");
- if (ret)
- return ret;
-
- ret = devm_gpio_request_one(info->dev, info->gpio_ale,
- GPIOF_OUT_INIT_LOW, "NAND ALE");
- if (ret)
- return ret;
-
- ret = devm_gpio_request_one(info->dev, info->gpio_read,
- GPIOF_OUT_INIT_LOW, "NAND READ");
- if (ret)
- return ret;
-
- ret = devm_gpio_request_one(info->dev, info->gpio_rdy,
- GPIOF_IN, "NAND RDY");
- return ret;
-}
-
-static int rb91x_nand_probe(struct platform_device *pdev)
-{
- struct rb91x_nand_info *rbni;
- struct rb91x_nand_platform_data *pdata;
- struct mtd_info *mtd;
- int ret;
-
- pr_info(DRV_DESC "\n");
-
- pdata = dev_get_platdata(&pdev->dev);
- if (!pdata)
- return -EINVAL;
-
- rbni = devm_kzalloc(&pdev->dev, sizeof(*rbni), GFP_KERNEL);
- if (!rbni)
- return -ENOMEM;
-
- rbni->dev = &pdev->dev;
- rbni->gpio_nce = pdata->gpio_nce;
- rbni->gpio_ale = pdata->gpio_ale;
- rbni->gpio_cle = pdata->gpio_cle;
- rbni->gpio_read = pdata->gpio_read;
- rbni->gpio_nrw = pdata->gpio_nrw;
- rbni->gpio_rdy = pdata->gpio_rdy;
- rbni->gpio_nle = pdata->gpio_nle;
-
- rbni->chip.priv = &rbni;
- mtd = rbinfo_to_mtd(rbni);
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
- mtd->priv = &rbni->chip;
-#endif
- mtd->owner = THIS_MODULE;
-
- rbni->chip.cmd_ctrl = rb91x_nand_cmd_ctrl;
- rbni->chip.dev_ready = rb91x_nand_dev_ready;
- rbni->chip.read_byte = rb91x_nand_read_byte;
- rbni->chip.write_buf = rb91x_nand_write_buf;
- rbni->chip.read_buf = rb91x_nand_read_buf;
-
- rbni->chip.chip_delay = 25;
- rbni->chip.ecc.mode = NAND_ECC_SOFT;
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)
- rbni->chip.ecc.algo = NAND_ECC_HAMMING;
-#endif
- rbni->chip.options = NAND_NO_SUBPAGE_WRITE;
-
- platform_set_drvdata(pdev, rbni);
-
- ret = rb91x_nand_gpio_init(rbni);
- if (ret)
- return ret;
-
- ret = nand_scan_ident(mtd, 1, NULL);
- if (ret)
- return ret;
-
- if (mtd->writesize == 512)
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
- rbni->chip.ecc.layout = &rb91x_nand_ecclayout;
-#else
- mtd_set_ooblayout(mtd, &rb91x_nand_ecclayout_ops);
-#endif
-
- ret = nand_scan_tail(mtd);
- if (ret)
- return ret;
-
- ret = mtd_device_register(mtd, rb91x_nand_partitions,
- ARRAY_SIZE(rb91x_nand_partitions));
- if (ret)
- goto err_release_nand;
-
- return 0;
-
-err_release_nand:
- nand_release(&rbni->chip);
- return ret;
-}
-
-static int rb91x_nand_remove(struct platform_device *pdev)
-{
- struct rb91x_nand_info *info = platform_get_drvdata(pdev);
-
- nand_release(&info->chip);
-
- return 0;
-}
-
-static struct platform_driver rb91x_nand_driver = {
- .probe = rb91x_nand_probe,
- .remove = rb91x_nand_remove,
- .driver = {
- .name = RB91X_NAND_DRIVER_NAME,
- .owner = THIS_MODULE,
- },
-};
-
-module_platform_driver(rb91x_nand_driver);
-
-MODULE_DESCRIPTION(DRV_DESC);
-MODULE_VERSION(DRV_VERSION);
-MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
-MODULE_LICENSE("GPL v2");
projects / openwrt / openwrt.git / blobdiff