Commit ce4c61f1 authored by Thomas Gleixner's avatar Thomas Gleixner

[MTD] Add support for NDFC NAND controller

NDFC NAND Flash controller is embedded in PPC EP44x SoCs.
Add platform driver based support.
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 41796c2e
......@@ -129,6 +129,12 @@ config MTD_NAND_S3C2410_HWECC
currently not be able to switch to software, as there is no
implementation for ECC method used by the S3C2410
config MTD_NAND_NDFC
tristate "NDFC NanD Flash Controller"
depends on MTD_NAND && 44x
help
NDFC Nand Flash Controllers are integrated in EP44x SoCs
config MTD_NAND_DISKONCHIP
tristate "DiskOnChip 2000, Millennium and Millennium Plus (NAND reimplementation) (EXPERIMENTAL)"
depends on MTD_NAND && EXPERIMENTAL
......
......@@ -21,5 +21,6 @@ obj-$(CONFIG_MTD_NAND_SHARPSL) += sharpsl.o
obj-$(CONFIG_MTD_NAND_TS7250) += ts7250.o
obj-$(CONFIG_MTD_NAND_NANDSIM) += nandsim.o
obj-$(CONFIG_MTD_NAND_CS553X) += cs553x_nand.o
obj-$(CONFIG_MTD_NAND_NDFC) += ndfc.o
nand-objs = nand_base.o nand_bbt.o
/*
* 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/ubi.h>
#include <linux/mtd/mtd.h>
#include <linux/platform_device.h>
#include <asm/io.h>
#include <asm/ibm44x.h>
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;
writel(ccr, ndfc->ndfcbase + NDFC_CCR);
}
static void ndfc_hwcontrol(struct mtd_info *mtd, int cmd)
{
struct ndfc_controller *ndfc = &ndfc_ctrl;
struct nand_chip *chip = mtd->priv;
switch (cmd) {
case NAND_CTL_SETCLE:
chip->IO_ADDR_W = ndfc->ndfcbase + NDFC_CMD;
break;
case NAND_CTL_SETALE:
chip->IO_ADDR_W = ndfc->ndfcbase + NDFC_ALE;
break;
default:
chip->IO_ADDR_W = ndfc->ndfcbase + NDFC_DATA;
break;
}
}
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->hwcontrol = 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->correct_data = nand_correct_data;
chip->enable_hwecc = ndfc_enable_hwecc;
chip->calculate_ecc = ndfc_calculate_ecc;
chip->eccmode = NAND_ECC_HW3_256;
chip->autooob = mtd->pl_chip->autooob;
mtd->mtd.priv = chip;
mtd->mtd.owner = THIS_MODULE;
}
static int ndfc_chip_probe(struct platform_device *pdev)
{
int rc;
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) {
struct mtd_info *mtd_ubi;
nc->partitions[NAND_PARTS_CONTENT_IDX].mtdp = &mtd_ubi;
add_mtd_device(&nandmtd->mtd); /* for testing */
add_mtd_partitions(&nandmtd->mtd,
nc->partitions,
nc->nr_partitions);
add_mtd_device(mtd_ubi);
} 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 = NDFC_PHYSADDR_OFFS | res->start;
ndfc->ndfcbase = ioremap64(phys, res->end - res->start + 1);
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 = 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");
/*
* linux/include/linux/mtd/ndfc.h
*
* Copyright (c) 2006 Thomas Gleixner <tglx@linutronix.de>
*
* 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.
*
* Info:
* Contains defines, datastructures for ndfc nand controller
*
*/
#ifndef __LINUX_MTD_NDFC_H
#define __LINUX_MTD_NDFC_H
/* NDFC Register definitions */
#define NDFC_CMD 0x00
#define NDFC_ALE 0x04
#define NDFC_DATA 0x08
#define NDFC_ECC 0x10
#define NDFC_BCFG0 0x30
#define NDFC_BCFG1 0x34
#define NDFC_BCFG2 0x38
#define NDFC_BCFG3 0x3c
#define NDFC_CCR 0x40
#define NDFC_STAT 0x44
#define NDFC_HWCTL 0x48
#define NDFC_REVID 0x50
#define NDFC_STAT_IS_READY 0x01000000
#define NDFC_CCR_RESET_CE 0x80000000 /* CE Reset */
#define NDFC_CCR_RESET_ECC 0x40000000 /* ECC Reset */
#define NDFC_CCR_RIE 0x20000000 /* Interrupt Enable on Device Rdy */
#define NDFC_CCR_REN 0x10000000 /* Enable wait for Rdy in LinearR */
#define NDFC_CCR_ROMEN 0x08000000 /* Enable ROM In LinearR */
#define NDFC_CCR_ARE 0x04000000 /* Auto-Read Enable */
#define NDFC_CCR_BS(x) (((x) & 0x3) << 24) /* Select Bank on CE[x] */
#define NDFC_CCR_BS_MASK 0x03000000 /* Select Bank */
#define NDFC_CCR_ARAC0 0x00000000 /* 3 Addr, 1 Col 2 Row 512b page */
#define NDFC_CCR_ARAC1 0x00001000 /* 4 Addr, 1 Col 3 Row 512b page */
#define NDFC_CCR_ARAC2 0x00002000 /* 4 Addr, 2 Col 2 Row 2K page */
#define NDFC_CCR_ARAC3 0x00003000 /* 5 Addr, 2 Col 3 Row 2K page */
#define NDFC_CCR_ARAC_MASK 0x00003000 /* Auto-Read mode Addr Cycles */
#define NDFC_CCR_RPG 0x0000C000 /* Auto-Read Page */
#define NDFC_CCR_EBCC 0x00000004 /* EBC Configuration Completed */
#define NDFC_CCR_DHC 0x00000002 /* Direct Hardware Control Enable */
#define NDFC_BxCFG_EN 0x80000000 /* Bank Enable */
#define NDFC_BxCFG_CED 0x40000000 /* nCE Style */
#define NDFC_BxCFG_SZ_MASK 0x08000000 /* Bank Size */
#define NDFC_BxCFG_SZ_8BIT 0x00000000 /* 8bit */
#define NDFC_BxCFG_SZ_16BIT 0x08000000 /* 16bit */
#define NDFC_MAX_BANKS 4
struct ndfc_controller_settings {
uint32_t ccr_settings;
};
struct ndfc_chip_settings {
uint32_t bank_settings;
};
#endif
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment