364 lines
8.5 KiB
C
364 lines
8.5 KiB
C
|
/*
|
||
|
|
* Freescale UPM NAND driver.
|
||
|
|
*
|
||
|
|
* Copyright © 2007-2008 MontaVista Software, Inc.
|
||
|
|
*
|
||
|
|
* Author: 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 <linux/kernel.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/delay.h>
|
||
|
|
#include <linux/mtd/nand.h>
|
||
|
|
#include <linux/mtd/nand_ecc.h>
|
||
|
|
#include <linux/mtd/partitions.h>
|
||
|
|
#include <linux/mtd/mtd.h>
|
||
|
|
#include <linux/of_address.h>
|
||
|
|
#include <linux/of_platform.h>
|
||
|
|
#include <linux/of_gpio.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <asm/fsl_lbc.h>
|
||
|
|
|
||
|
|
#define FSL_UPM_WAIT_RUN_PATTERN 0x1
|
||
|
|
#define FSL_UPM_WAIT_WRITE_BYTE 0x2
|
||
|
|
#define FSL_UPM_WAIT_WRITE_BUFFER 0x4
|
||
|
|
|
||
|
|
struct fsl_upm_nand {
|
||
|
|
struct device *dev;
|
||
|
|
struct nand_chip chip;
|
||
|
|
int last_ctrl;
|
||
|
|
struct mtd_partition *parts;
|
||
|
|
struct fsl_upm upm;
|
||
|
|
uint8_t upm_addr_offset;
|
||
|
|
uint8_t upm_cmd_offset;
|
||
|
|
void __iomem *io_base;
|
||
|
|
int rnb_gpio[NAND_MAX_CHIPS];
|
||
|
|
uint32_t mchip_offsets[NAND_MAX_CHIPS];
|
||
|
|
uint32_t mchip_count;
|
||
|
|
uint32_t mchip_number;
|
||
|
|
int chip_delay;
|
||
|
|
uint32_t wait_flags;
|
||
|
|
};
|
||
|
|
|
||
|
|
static inline struct fsl_upm_nand *to_fsl_upm_nand(struct mtd_info *mtdinfo)
|
||
|
|
{
|
||
|
|
return container_of(mtd_to_nand(mtdinfo), struct fsl_upm_nand,
|
||
|
|
chip);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int fun_chip_ready(struct mtd_info *mtd)
|
||
|
|
{
|
||
|
|
struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
|
||
|
|
|
||
|
|
if (gpio_get_value(fun->rnb_gpio[fun->mchip_number]))
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
dev_vdbg(fun->dev, "busy\n");
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void fun_wait_rnb(struct fsl_upm_nand *fun)
|
||
|
|
{
|
||
|
|
if (fun->rnb_gpio[fun->mchip_number] >= 0) {
|
||
|
|
struct mtd_info *mtd = nand_to_mtd(&fun->chip);
|
||
|
|
int cnt = 1000000;
|
||
|
|
|
||
|
|
while (--cnt && !fun_chip_ready(mtd))
|
||
|
|
cpu_relax();
|
||
|
|
if (!cnt)
|
||
|
|
dev_err(fun->dev, "tired waiting for RNB\n");
|
||
|
|
} else {
|
||
|
|
ndelay(100);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void fun_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
|
||
|
|
{
|
||
|
|
struct nand_chip *chip = mtd_to_nand(mtd);
|
||
|
|
struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
|
||
|
|
u32 mar;
|
||
|
|
|
||
|
|
if (!(ctrl & fun->last_ctrl)) {
|
||
|
|
fsl_upm_end_pattern(&fun->upm);
|
||
|
|
|
||
|
|
if (cmd == NAND_CMD_NONE)
|
||
|
|
return;
|
||
|
|
|
||
|
|
fun->last_ctrl = ctrl & (NAND_ALE | NAND_CLE);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (ctrl & NAND_CTRL_CHANGE) {
|
||
|
|
if (ctrl & NAND_ALE)
|
||
|
|
fsl_upm_start_pattern(&fun->upm, fun->upm_addr_offset);
|
||
|
|
else if (ctrl & NAND_CLE)
|
||
|
|
fsl_upm_start_pattern(&fun->upm, fun->upm_cmd_offset);
|
||
|
|
}
|
||
|
|
|
||
|
|
mar = (cmd << (32 - fun->upm.width)) |
|
||
|
|
fun->mchip_offsets[fun->mchip_number];
|
||
|
|
fsl_upm_run_pattern(&fun->upm, chip->IO_ADDR_R, mar);
|
||
|
|
|
||
|
|
if (fun->wait_flags & FSL_UPM_WAIT_RUN_PATTERN)
|
||
|
|
fun_wait_rnb(fun);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void fun_select_chip(struct mtd_info *mtd, int mchip_nr)
|
||
|
|
{
|
||
|
|
struct nand_chip *chip = mtd_to_nand(mtd);
|
||
|
|
struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
|
||
|
|
|
||
|
|
if (mchip_nr == -1) {
|
||
|
|
chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);
|
||
|
|
} else if (mchip_nr >= 0 && mchip_nr < NAND_MAX_CHIPS) {
|
||
|
|
fun->mchip_number = mchip_nr;
|
||
|
|
chip->IO_ADDR_R = fun->io_base + fun->mchip_offsets[mchip_nr];
|
||
|
|
chip->IO_ADDR_W = chip->IO_ADDR_R;
|
||
|
|
} else {
|
||
|
|
BUG();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static uint8_t fun_read_byte(struct mtd_info *mtd)
|
||
|
|
{
|
||
|
|
struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
|
||
|
|
|
||
|
|
return in_8(fun->chip.IO_ADDR_R);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void fun_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
|
||
|
|
{
|
||
|
|
struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i < len; i++)
|
||
|
|
buf[i] = in_8(fun->chip.IO_ADDR_R);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void fun_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
|
||
|
|
{
|
||
|
|
struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i < len; i++) {
|
||
|
|
out_8(fun->chip.IO_ADDR_W, buf[i]);
|
||
|
|
if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BYTE)
|
||
|
|
fun_wait_rnb(fun);
|
||
|
|
}
|
||
|
|
if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BUFFER)
|
||
|
|
fun_wait_rnb(fun);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int fun_chip_init(struct fsl_upm_nand *fun,
|
||
|
|
const struct device_node *upm_np,
|
||
|
|
const struct resource *io_res)
|
||
|
|
{
|
||
|
|
struct mtd_info *mtd = nand_to_mtd(&fun->chip);
|
||
|
|
int ret;
|
||
|
|
struct device_node *flash_np;
|
||
|
|
|
||
|
|
fun->chip.IO_ADDR_R = fun->io_base;
|
||
|
|
fun->chip.IO_ADDR_W = fun->io_base;
|
||
|
|
fun->chip.cmd_ctrl = fun_cmd_ctrl;
|
||
|
|
fun->chip.chip_delay = fun->chip_delay;
|
||
|
|
fun->chip.read_byte = fun_read_byte;
|
||
|
|
fun->chip.read_buf = fun_read_buf;
|
||
|
|
fun->chip.write_buf = fun_write_buf;
|
||
|
|
fun->chip.ecc.mode = NAND_ECC_SOFT;
|
||
|
|
fun->chip.ecc.algo = NAND_ECC_HAMMING;
|
||
|
|
if (fun->mchip_count > 1)
|
||
|
|
fun->chip.select_chip = fun_select_chip;
|
||
|
|
|
||
|
|
if (fun->rnb_gpio[0] >= 0)
|
||
|
|
fun->chip.dev_ready = fun_chip_ready;
|
||
|
|
|
||
|
|
mtd->dev.parent = fun->dev;
|
||
|
|
|
||
|
|
flash_np = of_get_next_child(upm_np, NULL);
|
||
|
|
if (!flash_np)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
nand_set_flash_node(&fun->chip, flash_np);
|
||
|
|
mtd->name = kasprintf(GFP_KERNEL, "0x%llx.%s", (u64)io_res->start,
|
||
|
|
flash_np->name);
|
||
|
|
if (!mtd->name) {
|
||
|
|
ret = -ENOMEM;
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = nand_scan(mtd, fun->mchip_count);
|
||
|
|
if (ret)
|
||
|
|
goto err;
|
||
|
|
|
||
|
|
ret = mtd_device_register(mtd, NULL, 0);
|
||
|
|
err:
|
||
|
|
of_node_put(flash_np);
|
||
|
|
if (ret)
|
||
|
|
kfree(mtd->name);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int fun_probe(struct platform_device *ofdev)
|
||
|
|
{
|
||
|
|
struct fsl_upm_nand *fun;
|
||
|
|
struct resource io_res;
|
||
|
|
const __be32 *prop;
|
||
|
|
int rnb_gpio;
|
||
|
|
int ret;
|
||
|
|
int size;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
fun = kzalloc(sizeof(*fun), GFP_KERNEL);
|
||
|
|
if (!fun)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
ret = of_address_to_resource(ofdev->dev.of_node, 0, &io_res);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(&ofdev->dev, "can't get IO base\n");
|
||
|
|
goto err1;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = fsl_upm_find(io_res.start, &fun->upm);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(&ofdev->dev, "can't find UPM\n");
|
||
|
|
goto err1;
|
||
|
|
}
|
||
|
|
|
||
|
|
prop = of_get_property(ofdev->dev.of_node, "fsl,upm-addr-offset",
|
||
|
|
&size);
|
||
|
|
if (!prop || size != sizeof(uint32_t)) {
|
||
|
|
dev_err(&ofdev->dev, "can't get UPM address offset\n");
|
||
|
|
ret = -EINVAL;
|
||
|
|
goto err1;
|
||
|
|
}
|
||
|
|
fun->upm_addr_offset = *prop;
|
||
|
|
|
||
|
|
prop = of_get_property(ofdev->dev.of_node, "fsl,upm-cmd-offset", &size);
|
||
|
|
if (!prop || size != sizeof(uint32_t)) {
|
||
|
|
dev_err(&ofdev->dev, "can't get UPM command offset\n");
|
||
|
|
ret = -EINVAL;
|
||
|
|
goto err1;
|
||
|
|
}
|
||
|
|
fun->upm_cmd_offset = *prop;
|
||
|
|
|
||
|
|
prop = of_get_property(ofdev->dev.of_node,
|
||
|
|
"fsl,upm-addr-line-cs-offsets", &size);
|
||
|
|
if (prop && (size / sizeof(uint32_t)) > 0) {
|
||
|
|
fun->mchip_count = size / sizeof(uint32_t);
|
||
|
|
if (fun->mchip_count >= NAND_MAX_CHIPS) {
|
||
|
|
dev_err(&ofdev->dev, "too much multiple chips\n");
|
||
|
|
goto err1;
|
||
|
|
}
|
||
|
|
for (i = 0; i < fun->mchip_count; i++)
|
||
|
|
fun->mchip_offsets[i] = be32_to_cpu(prop[i]);
|
||
|
|
} else {
|
||
|
|
fun->mchip_count = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
for (i = 0; i < fun->mchip_count; i++) {
|
||
|
|
fun->rnb_gpio[i] = -1;
|
||
|
|
rnb_gpio = of_get_gpio(ofdev->dev.of_node, i);
|
||
|
|
if (rnb_gpio >= 0) {
|
||
|
|
ret = gpio_request(rnb_gpio, dev_name(&ofdev->dev));
|
||
|
|
if (ret) {
|
||
|
|
dev_err(&ofdev->dev,
|
||
|
|
"can't request RNB gpio #%d\n", i);
|
||
|
|
goto err2;
|
||
|
|
}
|
||
|
|
gpio_direction_input(rnb_gpio);
|
||
|
|
fun->rnb_gpio[i] = rnb_gpio;
|
||
|
|
} else if (rnb_gpio == -EINVAL) {
|
||
|
|
dev_err(&ofdev->dev, "RNB gpio #%d is invalid\n", i);
|
||
|
|
goto err2;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
prop = of_get_property(ofdev->dev.of_node, "chip-delay", NULL);
|
||
|
|
if (prop)
|
||
|
|
fun->chip_delay = be32_to_cpup(prop);
|
||
|
|
else
|
||
|
|
fun->chip_delay = 50;
|
||
|
|
|
||
|
|
prop = of_get_property(ofdev->dev.of_node, "fsl,upm-wait-flags", &size);
|
||
|
|
if (prop && size == sizeof(uint32_t))
|
||
|
|
fun->wait_flags = be32_to_cpup(prop);
|
||
|
|
else
|
||
|
|
fun->wait_flags = FSL_UPM_WAIT_RUN_PATTERN |
|
||
|
|
FSL_UPM_WAIT_WRITE_BYTE;
|
||
|
|
|
||
|
|
fun->io_base = devm_ioremap_nocache(&ofdev->dev, io_res.start,
|
||
|
|
resource_size(&io_res));
|
||
|
|
if (!fun->io_base) {
|
||
|
|
ret = -ENOMEM;
|
||
|
|
goto err2;
|
||
|
|
}
|
||
|
|
|
||
|
|
fun->dev = &ofdev->dev;
|
||
|
|
fun->last_ctrl = NAND_CLE;
|
||
|
|
|
||
|
|
ret = fun_chip_init(fun, ofdev->dev.of_node, &io_res);
|
||
|
|
if (ret)
|
||
|
|
goto err2;
|
||
|
|
|
||
|
|
dev_set_drvdata(&ofdev->dev, fun);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
err2:
|
||
|
|
for (i = 0; i < fun->mchip_count; i++) {
|
||
|
|
if (fun->rnb_gpio[i] < 0)
|
||
|
|
break;
|
||
|
|
gpio_free(fun->rnb_gpio[i]);
|
||
|
|
}
|
||
|
|
err1:
|
||
|
|
kfree(fun);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int fun_remove(struct platform_device *ofdev)
|
||
|
|
{
|
||
|
|
struct fsl_upm_nand *fun = dev_get_drvdata(&ofdev->dev);
|
||
|
|
struct mtd_info *mtd = nand_to_mtd(&fun->chip);
|
||
|
|
int i;
|
||
|
|
|
||
|
|
nand_release(&fun->chip);
|
||
|
|
kfree(mtd->name);
|
||
|
|
|
||
|
|
for (i = 0; i < fun->mchip_count; i++) {
|
||
|
|
if (fun->rnb_gpio[i] < 0)
|
||
|
|
break;
|
||
|
|
gpio_free(fun->rnb_gpio[i]);
|
||
|
|
}
|
||
|
|
|
||
|
|
kfree(fun);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct of_device_id of_fun_match[] = {
|
||
|
|
{ .compatible = "fsl,upm-nand" },
|
||
|
|
{},
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, of_fun_match);
|
||
|
|
|
||
|
|
static struct platform_driver of_fun_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "fsl,upm-nand",
|
||
|
|
.of_match_table = of_fun_match,
|
||
|
|
},
|
||
|
|
.probe = fun_probe,
|
||
|
|
.remove = fun_remove,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_platform_driver(of_fun_driver);
|
||
|
|
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
|
||
|
|
MODULE_DESCRIPTION("Driver for NAND chips working through Freescale "
|
||
|
|
"LocalBus User-Programmable Machine");
|