+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright © 2009 Nuvoton technology corporation.
- *
- * Wan ZongShun <mcuos.com@gmail.com>
- */
-
-#include <linux/slab.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/rawnand.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 nuc900_nand {
- struct nand_chip chip;
- void __iomem *reg;
- struct clk *clk;
- spinlock_t lock;
-};
-
-static inline struct nuc900_nand *mtd_to_nuc900(struct mtd_info *mtd)
-{
- return container_of(mtd_to_nand(mtd), struct nuc900_nand, chip);
-}
-
-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 nuc900_nand_read_byte(struct nand_chip *chip)
-{
- unsigned char ret;
- struct nuc900_nand *nand = mtd_to_nuc900(nand_to_mtd(chip));
-
- ret = (unsigned char)read_data_reg(nand);
-
- return ret;
-}
-
-static void nuc900_nand_read_buf(struct nand_chip *chip,
- unsigned char *buf, int len)
-{
- int i;
- struct nuc900_nand *nand = mtd_to_nuc900(nand_to_mtd(chip));
-
- for (i = 0; i < len; i++)
- buf[i] = (unsigned char)read_data_reg(nand);
-}
-
-static void nuc900_nand_write_buf(struct nand_chip *chip,
- const unsigned char *buf, int len)
-{
- int i;
- struct nuc900_nand *nand = mtd_to_nuc900(nand_to_mtd(chip));
-
- for (i = 0; i < len; i++)
- write_data_reg(nand, buf[i]);
-}
-
-static int nuc900_check_rb(struct nuc900_nand *nand)
-{
- unsigned int val;
- spin_lock(&nand->lock);
- val = __raw_readl(nand->reg + REG_SMISR);
- val &= READYBUSY;
- spin_unlock(&nand->lock);
-
- return val;
-}
-
-static int nuc900_nand_devready(struct nand_chip *chip)
-{
- struct nuc900_nand *nand = mtd_to_nuc900(nand_to_mtd(chip));
- int ready;
-
- ready = (nuc900_check_rb(nand)) ? 1 : 0;
- return ready;
-}
-
-static void nuc900_nand_command_lp(struct nand_chip *chip,
- unsigned int command,
- int column, int page_addr)
-{
- struct mtd_info *mtd = nand_to_mtd(chip);
- struct nuc900_nand *nand = mtd_to_nuc900(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 &&
- !nand_opcode_8bits(command))
- 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->options & NAND_ROW_ADDR_3) {
- 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:
- return;
-
- case NAND_CMD_RESET:
- if (chip->legacy.dev_ready)
- break;
- udelay(chip->legacy.chip_delay);
-
- write_cmd_reg(nand, NAND_CMD_STATUS);
- write_cmd_reg(nand, command);
-
- while (!nuc900_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);
- /* fall through */
-
- default:
-
- if (!chip->legacy.dev_ready) {
- udelay(chip->legacy.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->legacy.dev_ready(chip))
- ;
-}
-
-
-static void nuc900_nand_enable(struct nuc900_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, nand->reg + 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 nuc900_nand_probe(struct platform_device *pdev)
-{
- struct nuc900_nand *nuc900_nand;
- struct nand_chip *chip;
- struct mtd_info *mtd;
- struct resource *res;
-
- nuc900_nand = devm_kzalloc(&pdev->dev, sizeof(struct nuc900_nand),
- GFP_KERNEL);
- if (!nuc900_nand)
- return -ENOMEM;
- chip = &(nuc900_nand->chip);
- mtd = nand_to_mtd(chip);
-
- mtd->dev.parent = &pdev->dev;
- spin_lock_init(&nuc900_nand->lock);
-
- nuc900_nand->clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(nuc900_nand->clk))
- return -ENOENT;
- clk_enable(nuc900_nand->clk);
-
- chip->legacy.cmdfunc = nuc900_nand_command_lp;
- chip->legacy.dev_ready = nuc900_nand_devready;
- chip->legacy.read_byte = nuc900_nand_read_byte;
- chip->legacy.write_buf = nuc900_nand_write_buf;
- chip->legacy.read_buf = nuc900_nand_read_buf;
- chip->legacy.chip_delay = 50;
- chip->options = 0;
- chip->ecc.mode = NAND_ECC_SOFT;
- chip->ecc.algo = NAND_ECC_HAMMING;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- nuc900_nand->reg = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(nuc900_nand->reg))
- return PTR_ERR(nuc900_nand->reg);
-
- nuc900_nand_enable(nuc900_nand);
-
- if (nand_scan(chip, 1))
- return -ENXIO;
-
- mtd_device_register(mtd, partitions, ARRAY_SIZE(partitions));
-
- platform_set_drvdata(pdev, nuc900_nand);
-
- return 0;
-}
-
-static int nuc900_nand_remove(struct platform_device *pdev)
-{
- struct nuc900_nand *nuc900_nand = platform_get_drvdata(pdev);
-
- nand_release(&nuc900_nand->chip);
- clk_disable(nuc900_nand->clk);
-
- return 0;
-}
-
-static struct platform_driver nuc900_nand_driver = {
- .probe = nuc900_nand_probe,
- .remove = nuc900_nand_remove,
- .driver = {
- .name = "nuc900-fmi",
- },
-};
-
-module_platform_driver(nuc900_nand_driver);
-
-MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
-MODULE_DESCRIPTION("w90p910/NUC9xx nand driver!");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:nuc900-fmi");
projects / linux-2.6-microblaze.git / commitdiff