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/*
* JZ4780 NAND driver
*
* Copyright (c) 2015 Imagination Technologies
* Author: Alex Smith <alex.smith@imgtec.com>
*
* 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/delay.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/gpio/consumer.h>
#include <linux/of_mtd.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <linux/jz4780-nemc.h>
#include "jz4780_bch.h"
#define DRV_NAME "jz4780-nand"
#define OFFSET_DATA 0x00000000
#define OFFSET_CMD 0x00400000
#define OFFSET_ADDR 0x00800000
/* Command delay when there is no R/B pin. */
#define RB_DELAY_US 100
struct jz4780_nand_cs {
unsigned int bank;
void __iomem *base;
};
struct jz4780_nand_controller {
struct device *dev;
struct jz4780_bch *bch;
struct nand_hw_control controller;
unsigned int num_banks;
struct list_head chips;
int selected;
struct jz4780_nand_cs cs[];
};
struct jz4780_nand_chip {
struct nand_chip chip;
struct list_head chip_list;
struct nand_ecclayout ecclayout;
struct gpio_desc *busy_gpio;
struct gpio_desc *wp_gpio;
unsigned int reading: 1;
};
static inline struct jz4780_nand_chip *to_jz4780_nand_chip(struct mtd_info *mtd)
{
return container_of(mtd_to_nand(mtd), struct jz4780_nand_chip, chip);
}
static inline struct jz4780_nand_controller *to_jz4780_nand_controller(struct nand_hw_control *ctrl)
{
return container_of(ctrl, struct jz4780_nand_controller, controller);
}
static void jz4780_nand_select_chip(struct mtd_info *mtd, int chipnr)
{
struct jz4780_nand_chip *nand = to_jz4780_nand_chip(mtd);
struct jz4780_nand_controller *nfc = to_jz4780_nand_controller(nand->chip.controller);
struct jz4780_nand_cs *cs;
/* Ensure the currently selected chip is deasserted. */
if (chipnr == -1 && nfc->selected >= 0) {
cs = &nfc->cs[nfc->selected];
jz4780_nemc_assert(nfc->dev, cs->bank, false);
}
nfc->selected = chipnr;
}
static void jz4780_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
unsigned int ctrl)
{
struct jz4780_nand_chip *nand = to_jz4780_nand_chip(mtd);
struct jz4780_nand_controller *nfc = to_jz4780_nand_controller(nand->chip.controller);
struct jz4780_nand_cs *cs;
if (WARN_ON(nfc->selected < 0))
return;
cs = &nfc->cs[nfc->selected];
jz4780_nemc_assert(nfc->dev, cs->bank, ctrl & NAND_NCE);
if (cmd == NAND_CMD_NONE)
return;
if (ctrl & NAND_ALE)
writeb(cmd, cs->base + OFFSET_ADDR);
else if (ctrl & NAND_CLE)
writeb(cmd, cs->base + OFFSET_CMD);
}
static int jz4780_nand_dev_ready(struct mtd_info *mtd)
{
struct jz4780_nand_chip *nand = to_jz4780_nand_chip(mtd);
return !gpiod_get_value_cansleep(nand->busy_gpio);
}
static void jz4780_nand_ecc_hwctl(struct mtd_info *mtd, int mode)
{
struct jz4780_nand_chip *nand = to_jz4780_nand_chip(mtd);
nand->reading = (mode == NAND_ECC_READ);
}
static int jz4780_nand_ecc_calculate(struct mtd_info *mtd, const u8 *dat,
u8 *ecc_code)
{
struct jz4780_nand_chip *nand = to_jz4780_nand_chip(mtd);
struct jz4780_nand_controller *nfc = to_jz4780_nand_controller(nand->chip.controller);
struct jz4780_bch_params params;
/*
* Don't need to generate the ECC when reading, BCH does it for us as
* part of decoding/correction.
*/
if (nand->reading)
return 0;
params.size = nand->chip.ecc.size;
params.bytes = nand->chip.ecc.bytes;
params.strength = nand->chip.ecc.strength;
return jz4780_bch_calculate(nfc->bch, ¶ms, dat, ecc_code);
}
static int jz4780_nand_ecc_correct(struct mtd_info *mtd, u8 *dat,
u8 *read_ecc, u8 *calc_ecc)
{
struct jz4780_nand_chip *nand = to_jz4780_nand_chip(mtd);
struct jz4780_nand_controller *nfc = to_jz4780_nand_controller(nand->chip.controller);
struct jz4780_bch_params params;
params.size = nand->chip.ecc.size;
params.bytes = nand->chip.ecc.bytes;
params.strength = nand->chip.ecc.strength;
return jz4780_bch_correct(nfc->bch, ¶ms, dat, read_ecc);
}
static int jz4780_nand_init_ecc(struct jz4780_nand_chip *nand, struct device *dev)
{
struct nand_chip *chip = &nand->chip;
struct mtd_info *mtd = nand_to_mtd(chip);
struct jz4780_nand_controller *nfc = to_jz4780_nand_controller(chip->controller);
struct nand_ecclayout *layout = &nand->ecclayout;
u32 start, i;
chip->ecc.bytes = fls((1 + 8) * chip->ecc.size) *
(chip->ecc.strength / 8);
switch (chip->ecc.mode) {
case NAND_ECC_HW:
if (!nfc->bch) {
dev_err(dev, "HW BCH selected, but BCH controller not found\n");
return -ENODEV;
}
chip->ecc.hwctl = jz4780_nand_ecc_hwctl;
chip->ecc.calculate = jz4780_nand_ecc_calculate;
chip->ecc.correct = jz4780_nand_ecc_correct;
/* fall through */
case NAND_ECC_SOFT:
case NAND_ECC_SOFT_BCH:
dev_info(dev, "using %s (strength %d, size %d, bytes %d)\n",
(nfc->bch) ? "hardware BCH" : "software ECC",
chip->ecc.strength, chip->ecc.size, chip->ecc.bytes);
break;
case NAND_ECC_NONE:
dev_info(dev, "not using ECC\n");
break;
default:
dev_err(dev, "ECC mode %d not supported\n", chip->ecc.mode);
return -EINVAL;
}
/* The NAND core will generate the ECC layout for SW ECC */
if (chip->ecc.mode != NAND_ECC_HW)
return 0;
/* Generate ECC layout. ECC codes are right aligned in the OOB area. */
layout->eccbytes = mtd->writesize / chip->ecc.size * chip->ecc.bytes;
if (layout->eccbytes > mtd->oobsize - 2) {
dev_err(dev,
"invalid ECC config: required %d ECC bytes, but only %d are available",
layout->eccbytes, mtd->oobsize - 2);
return -EINVAL;
}
start = mtd->oobsize - layout->eccbytes;
for (i = 0; i < layout->eccbytes; i++)
layout->eccpos[i] = start + i;
layout->oobfree[0].offset = 2;
layout->oobfree[0].length = mtd->oobsize - layout->eccbytes - 2;
chip->ecc.layout = layout;
return 0;
}
static int jz4780_nand_init_chip(struct platform_device *pdev,
struct jz4780_nand_controller *nfc,
struct device_node *np,
unsigned int chipnr)
{
struct device *dev = &pdev->dev;
struct jz4780_nand_chip *nand;
struct jz4780_nand_cs *cs;
struct resource
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