ndfc.c
/*
* drivers/mtd/ndfc.c
*
* Overview:
* Platform independend driver for NDFC (NanD Flash Controller)
* integrated into EP440 cores
*
* Author: Thomas Gleixner
*
* Copyright 2006 IBM
*
* 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/module.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/ndfc.h>
#include <linux/mtd/mtd.h>
#include <linux/platform_device.h>
#include <asm/io.h>
#ifdef CONFIG_40x
#include <asm/ibm405.h>
#else
#include <asm/ibm44x.h>
#endif
struct ndfc_nand_mtd {
struct mtd_info mtd;
struct nand_chip chip;
struct platform_nand_chip *pl_chip;
};
static struct ndfc_nand_mtd ndfc_mtd[NDFC_MAX_BANKS];
struct ndfc_controller {
void __iomem *ndfcbase;
struct nand_hw_control ndfc_control;
atomic_t childs_active;
};
static struct ndfc_controller ndfc_ctrl;
static void ndfc_select_chip(struct mtd_info *mtd, int chip)
{
uint32_t ccr;
struct ndfc_controller *ndfc = &ndfc_ctrl;
struct nand_chip *nandchip = mtd->priv;
struct ndfc_nand_mtd *nandmtd = nandchip->priv;
struct platform_nand_chip *pchip = nandmtd->pl_chip;
ccr = __raw_readl(ndfc->ndfcbase + NDFC_CCR);
if (chip >= 0) {
ccr &= ~NDFC_CCR_BS_MASK;
ccr |= NDFC_CCR_BS(chip + pchip->chip_offset);
} else
ccr |= NDFC_CCR_RESET_CE;
__raw_writel(ccr, ndfc->ndfcbase + NDFC_CCR);
}
static void ndfc_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
struct ndfc_controller *ndfc = &ndfc_ctrl;
if (cmd == NAND_CMD_NONE)
return;
if (ctrl & NAND_CLE)
writel(cmd & 0xFF, ndfc->ndfcbase + NDFC_CMD);
else
writel(cmd & 0xFF, ndfc->ndfcbase + NDFC_ALE);
}
static int ndfc_ready(struct mtd_info *mtd)
{
struct ndfc_controller *ndfc = &ndfc_ctrl;
return __raw_readl(ndfc->ndfcbase + NDFC_STAT) & NDFC_STAT_IS_READY;
}
static void ndfc_enable_hwecc(struct mtd_info *mtd, int mode)
{
uint32_t ccr;
struct ndfc_controller *ndfc = &ndfc_ctrl;
ccr = __raw_readl(ndfc->ndfcbase + NDFC_CCR);
ccr |= NDFC_CCR_RESET_ECC;
__raw_writel(ccr, ndfc->ndfcbase + NDFC_CCR);
wmb();
}
static int ndfc_calculate_ecc(struct mtd_info *mtd,
const u_char *dat, u_char *ecc_code)
{
struct ndfc_controller *ndfc = &ndfc_ctrl;
uint32_t ecc;
uint8_t *p = (uint8_t *)&ecc;
wmb();
ecc = __raw_readl(ndfc->ndfcbase + NDFC_ECC);
ecc_code[0] = p[1];
ecc_code[1] = p[2];
ecc_code[2] = p[3];
return 0;
}
/*
* Speedups for buffer read/write/verify
*
* NDFC allows 32bit read/write of data. So we can speed up the buffer
* functions. No further checking, as nand_base will always read/write
* page aligned.
*/
static void ndfc_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
{
struct ndfc_controller *ndfc = &ndfc_ctrl;
uint32_t *p = (uint32_t *) buf;
for(;len > 0; len -= 4)
*p++ = __raw_readl(ndfc->ndfcbase + NDFC_DATA);
}
static void ndfc_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
{
struct ndfc_controller *ndfc = &ndfc_ctrl;
uint32_t *p = (uint32_t *) buf;
for(;len > 0; len -= 4)
__raw_writel(*p++, ndfc->ndfcbase + NDFC_DATA);
}
static int ndfc_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
{
struct ndfc_controller *ndfc = &ndfc_ctrl;
uint32_t *p = (uint32_t *) buf;
for(;len > 0; len -= 4)
if (*p++ != __raw_readl(ndfc->ndfcbase + NDFC_DATA))
return -EFAULT;
return 0;
}
/*
* Initialize chip structure
*/
static void ndfc_chip_init(struct ndfc_nand_mtd *mtd)
{
struct ndfc_controller *ndfc = &ndfc_ctrl;
struct nand_chip *chip = &mtd->chip;
chip->IO_ADDR_R = ndfc->ndfcbase + NDFC_DATA;
chip->IO_ADDR_W = ndfc->ndfcbase + NDFC_DATA;
chip->cmd_ctrl = ndfc_hwcontrol;
chip->dev_ready = ndfc_ready;
chip->select_chip = ndfc_select_chip;
chip->chip_delay = 50;
chip->priv = mtd;
chip->options = mtd->pl_chip->options;
chip->controller = &ndfc->ndfc_control;
chip->read_buf = ndfc_read_buf;
chip->write_buf = ndfc_write_buf;
chip->verify_buf = ndfc_verify_buf;
chip->ecc.correct = nand_correct_data;
chip->ecc.hwctl = ndfc_enable_hwecc;
chip->ecc.calculate = ndfc_calculate_ecc;
chip->ecc.mode = NAND_ECC_HW;
chip->ecc.size = 256;
chip->ecc.bytes = 3;
chip->ecclayout = chip->ecc.layout = mtd->pl_chip->ecclayout;
mtd->mtd.priv = chip;
mtd->mtd.owner = THIS_MODULE;
}
static int ndfc_chip_probe(struct platform_device *pdev)
{
struct platform_nand_chip *nc = pdev->dev.platform_data;
struct ndfc_chip_settings *settings = nc->priv;
struct ndfc_controller *ndfc = &ndfc_ctrl;
struct ndfc_nand_mtd *nandmtd;
if (nc->chip_offset >= NDFC_MAX_BANKS || nc->nr_chips > NDFC_MAX_BANKS)
return -EINVAL;
/* Set the bank settings */
__raw_writel(settings->bank_settings,
ndfc->ndfcbase + NDFC_BCFG0 + (nc->chip_offset << 2));
nandmtd = &ndfc_mtd[pdev->id];
if (nandmtd->pl_chip)
return -EBUSY;
nandmtd->pl_chip = nc;
ndfc_chip_init(nandmtd);
/* Scan for chips */
if (nand_scan(&nandmtd->mtd, nc->nr_chips)) {
nandmtd->pl_chip = NULL;
return -ENODEV;
}
#ifdef CONFIG_MTD_PARTITIONS
printk("Number of partitions %d\n", nc->nr_partitions);
if (nc->nr_partitions) {
/* Add the full device, so complete dumps can be made */
add_mtd_device(&nandmtd->mtd);
add_mtd_partitions(&nandmtd->mtd, nc->partitions,
nc->nr_partitions);
} else
#else
add_mtd_device(&nandmtd->mtd);
#endif
atomic_inc(&ndfc->childs_active);
return 0;
}
static int ndfc_chip_remove(struct platform_device *pdev)
{
return 0;
}
static int ndfc_nand_probe(struct platform_device *pdev)
{
struct platform_nand_ctrl *nc = pdev->dev.platform_data;
struct ndfc_controller_settings *settings = nc->priv;
struct resource *res = pdev->resource;
struct ndfc_controller *ndfc = &ndfc_ctrl;
unsigned long long phys = settings->ndfc_erpn | res->start;
#ifndef CONFIG_PHYS_64BIT
ndfc->ndfcbase = ioremap((phys_addr_t)phys, res->end - res->start + 1);
#else
ndfc->ndfcbase = ioremap64(phys, res->end - res->start + 1);
#endif
if (!ndfc->ndfcbase) {
printk(KERN_ERR "NDFC: ioremap failed\n");
return -EIO;
}
__raw_writel(settings->ccr_settings, ndfc->ndfcbase + NDFC_CCR);
spin_lock_init(&ndfc->ndfc_control.lock);
init_waitqueue_head(&ndfc->ndfc_control.wq);
platform_set_drvdata(pdev, ndfc);
printk("NDFC NAND Driver initialized. Chip-Rev: 0x%08x\n",
__raw_readl(ndfc->ndfcbase + NDFC_REVID));
return 0;
}
static int ndfc_nand_remove(struct platform_device *pdev)
{
struct ndfc_controller *ndfc = platform_get_drvdata(pdev);
if (atomic_read(&ndfc->childs_active))
return -EBUSY;
if (ndfc) {
platform_set_drvdata(pdev, NULL);
iounmap(ndfc_ctrl.ndfcbase);
ndfc_ctrl.ndfcbase = NULL;
}
return 0;
}
/* driver device registration */
static struct platform_driver ndfc_chip_driver = {
.probe = ndfc_chip_probe,
.remove = ndfc_chip_remove,
.driver = {
.name = "ndfc-chip",
.owner = THIS_MODULE,
},
};
static struct platform_driver ndfc_nand_driver = {
.probe = ndfc_nand_probe,
.remove = ndfc_nand_remove,
.driver = {
.name = "ndfc-nand",
.owner = THIS_MODULE,
},
};
static int __init ndfc_nand_init(void)
{
int ret;
spin_lock_init(&ndfc_ctrl.ndfc_control.lock);
init_waitqueue_head(&ndfc_ctrl.ndfc_control.wq);
ret = platform_driver_register(&ndfc_nand_driver);
if (!ret)
ret = platform_driver_register(&ndfc_chip_driver);
return ret;
}
static void __exit ndfc_nand_exit(void)
{
platform_driver_unregister(&ndfc_chip_driver);
platform_driver_unregister(&ndfc_nand_driver);
}
module_init(ndfc_nand_init);
module_exit(ndfc_nand_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
MODULE_DESCRIPTION("Platform driver for NDFC");