/*
* drivers/mtd/nand/nomadik_nand.c
*
* Overview:
* Driver for on-board NAND flash on Nomadik Platforms
*
* Copyright © 2007 STMicroelectronics Pvt. Ltd.
* Author: Sachin Verma <sachin.verma@st.com>
*
* Copyright © 2009 Alessandro Rubini
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/platform_device.h>
#include <linux/mtd/partitions.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <mach/nand.h>
#include <mach/fsmc.h>
#include <mtd/mtd-abi.h>
struct nomadik_nand_host {
struct mtd_info mtd;
struct nand_chip nand;
void __iomem *data_va;
void __iomem *cmd_va;
void __iomem *addr_va;
struct nand_bbt_descr *bbt_desc;
};
static struct nand_ecclayout nomadik_ecc_layout = {
.eccbytes = 3 * 4,
.eccpos = { /* each subpage has 16 bytes: pos 2,3,4 hosts ECC */
0x02, 0x03, 0x04,
0x12, 0x13, 0x14,
0x22, 0x23, 0x24,
0x32, 0x33, 0x34},
/* let's keep bytes 5,6,7 for us, just in case we change ECC algo */
.oobfree = { {0x08, 0x08}, {0x18, 0x08}, {0x28, 0x08}, {0x38, 0x08} },
};
static void nomadik_ecc_control(struct mtd_info *mtd, int mode)
{
/* No need to enable hw ecc, it's on by default */
}
static void nomadik_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
struct nand_chip *nand = mtd->priv;
struct nomadik_nand_host *host = nand->priv;
if (cmd == NAND_CMD_NONE)
return;
if (ctrl & NAND_CLE)
writeb(cmd, host->cmd_va);
else
writeb(cmd, host->addr_va);
}
static int nomadik_nand_probe(struct platform_device *pdev)
{
struct nomadik_nand_platform_data *pdata = pdev->dev.platform_data;
struct nomadik_nand_host *host;
struct mtd_info *mtd;
struct nand_chip *nand;
struct resource *res;
int ret = 0;
/* Allocate memory for the device structure (and zero it) */
host = kzalloc(sizeof(struct nomadik_nand_host), GFP_KERNEL);
if (!host) {
dev_err(&pdev->dev, "Failed to allocate device structure.\n");
return -ENOMEM;
}
/* Call the client's init function, if any */
if (pdata->init)
ret = pdata->init();
if (ret < 0) {
dev_err(&pdev->dev, "Init function failed\n");
goto err;
}
/* ioremap three regions */
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_addr");
if (!res) {
ret = -EIO;
goto err_unmap;
}
host->addr_va = ioremap(res->start, resource_size(res));
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_data");
if (!res) {
ret = -EIO;
goto err_unmap;
}
host->data_va = ioremap(res->start, resource_size(res));
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_cmd");
if (!res) {
ret = -EIO;
goto err_unmap;
}
host->cmd_va = ioremap(res->start, resource_size(res));
if (!host->addr_va || !host->data_va || !host->cmd_va) {
ret = -ENOMEM;
goto err_unmap;
}
/* Link all private pointers */
mtd = &host->mtd;
nand = &host->nand;
mtd->priv = nand;
nand->priv = host;
host->mtd.owner = THIS_MODULE;
nand->IO_ADDR_R = host->data_va;
nand->IO_ADDR_W = host->data_va;
nand->cmd_ctrl = nomadik_cmd_ctrl;
/*
* This stanza declares ECC_HW but uses soft routines. It's because
* HW claims to make the calculation but not the correction. However,
* I haven't managed to get the desired data out of it until now.
*/
nand->ecc.mode = NAND_ECC_SOFT;
nand->ecc.layout = &nomadik_ecc_layout;
nand->ecc.hwctl = nomadik_ecc_control;
nand->ecc.size = 512;
nand->ecc.bytes = 3;
nand->options = pdata->options;
/*
* Scan to find existence of the device
*/
if (nand_scan(&host->mtd, 1)) {
ret = -ENXIO;
goto err_unmap;
}
mtd_device_register(&host->mtd, pdata->parts, pdata->nparts);
platform_set_drvdata(pdev, host);
return 0;
err_unmap:
if (host->cmd_va)
iounmap(host->cmd_va);
if (host->data_va)
iounmap(host->data_va);
if (host->addr_va)
iounmap(host->addr_va);
err:
kfree(host);
return ret;
}
/*
* Clean up routine
*/
static int nomadik_nand_remove(struct platform_device *pdev)
{
struct nomadik_nand_host *host = platform_get_drvdata(pdev);
struct nomadik_nand_platform_data *pdata = pdev->dev.platform_data;
if (pdata->exit)
pdata->exit();
if (host) {
nand_release(&host->mtd);
iounmap(host->cmd_va);
iounmap(host->data_va);
iounmap(host->addr_va);
kfree(host);
}
return 0;
}
static int nomadik_nand_suspend(struct device *dev)
{
struct nomadik_nand_host *host = dev_get_drvdata(dev);
int ret = 0;
if (host)
ret = mtd_suspend(&host->mtd);
return ret;
}
static int nomadik_nand_resume(struct device *dev)
{
struct nomadik_nand_host *host = dev_get_drvdata(dev);
if (host)
mtd_resume(&host->mtd);
return 0;
}
static const struct dev_pm_ops nomadik_nand_pm_ops = {
.suspend = nomadik_nand_suspend,
.resume = nomadik_nand_resume,
};
static struct platform_driver nomadik_nand_driver = {
.probe = nomadik_nand_probe,
.remove = nomadik_nand_remove,
.driver = {
.owner = THIS_MODULE,
.name = "nomadik_nand",
.pm = &nomadik_nand_pm_ops,
},
};
module_platform_driver(nomadik_nand_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("ST Microelectronics (sachin.verma@st.com)");
MODULE_DESCRIPTION("NAND driver for Nomadik Platform");
