/*
* Copyright (C) 2006-2007 PA Semi, Inc
*
* Author: Egor Martovetsky <egor@pasemi.com>
* Maintained by: Olof Johansson <olof@lixom.net>
*
* Driver for the PWRficient onchip NAND flash interface
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#undef DEBUG
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pci.h>
#include <asm/io.h>
#define LBICTRL_LPCCTL_NR 0x00004000
#define CLE_PIN_CTL 15
#define ALE_PIN_CTL 14
static unsigned int lpcctl;
static struct mtd_info *pasemi_nand_mtd;
static const char driver_name[] = "pasemi-nand";
static void pasemi_read_buf(struct mtd_info *mtd, u_char *buf, int len)
{
struct nand_chip *chip = mtd->priv;
while (len > 0x800) {
memcpy_fromio(buf, chip->IO_ADDR_R, 0x800);
buf += 0x800;
len -= 0x800;
}
memcpy_fromio(buf, chip->IO_ADDR_R, len);
}
static void pasemi_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
{
struct nand_chip *chip = mtd->priv;
while (len > 0x800) {
memcpy_toio(chip->IO_ADDR_R, buf, 0x800);
buf += 0x800;
len -= 0x800;
}
memcpy_toio(chip->IO_ADDR_R, buf, len);
}
static void pasemi_hwcontrol(struct mtd_info *mtd, int cmd,
unsigned int ctrl)
{
struct nand_chip *chip = mtd->priv;
if (cmd == NAND_CMD_NONE)
return;
if (ctrl & NAND_CLE)
out_8(chip->IO_ADDR_W + (1 << CLE_PIN_CTL), cmd);
else
out_8(chip->IO_ADDR_W + (1 << ALE_PIN_CTL), cmd);
/* Push out posted writes */
eieio();
inl(lpcctl);
}
int pasemi_device_ready(struct mtd_info *mtd)
{
return !!(inl(lpcctl) & LBICTRL_LPCCTL_NR);
}
static int __devinit pasemi_nand_probe(struct of_device *ofdev,
const struct of_device_id *match)
{
struct pci_dev *pdev;
struct device_node *np = ofdev->node;
struct resource res;
struct nand_chip *chip;
int err = 0;
err = of_address_to_resource(np, 0, &res);
if (err)
return -EINVAL;
/* We only support one device at the moment */
if (pasemi_nand_mtd)
return -ENODEV;
pr_debug("pasemi_nand at %lx-%lx\n", res.start, res.end);
/* Allocate memory for MTD device structure and private data */
pasemi_nand_mtd = kzalloc(sizeof(struct mtd_info) +
sizeof(struct nand_chip), GFP_KERNEL);
if (!pasemi_nand_mtd) {
printk(KERN_WARNING
"Unable to allocate PASEMI NAND MTD device structure\n");
err = -ENOMEM;
goto out;
}
/* Get pointer to private data */
chip = (struct nand_chip *)&pasemi_nand_mtd[1];
/* Link the private data with the MTD structure */
pasemi_nand_mtd->priv = chip;
pasemi_nand_mtd->owner = THIS_MODULE;
chip->IO_ADDR_R = of_iomap(np, 0);
chip->IO_ADDR_W = chip->IO_ADDR_R;
if (!chip->IO_ADDR_R) {
err = -EIO;
goto out_mtd;
}
pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa008, NULL);
if (!pdev) {
err = -ENODEV;
goto out_ior;
}
lpcctl = pci_resource_start(pdev, 0);
if (!request_region(lpcctl, 4, driver_name)) {
err = -EBUSY;
goto out_ior;
}
chip->cmd_ctrl = pasemi_hwcontrol;
chip->dev_ready = pasemi_device_ready;
chip->read_buf = pasemi_read_buf;
chip->write_buf = pasemi_write_buf;
chip->chip_delay = 0;
chip->ecc.mode = NAND_ECC_SOFT;
/* Enable the following for a flash based bad block table */
chip->options = NAND_USE_FLASH_BBT | NAND_NO_AUTOINCR;
/* Scan to find existance of the device */
if (nand_scan(pasemi_nand_mtd, 1)) {
err = -ENXIO;
goto out_lpc;
}
if (add_mtd_device(pasemi_nand_mtd)) {
printk(KERN_ERR "pasemi_nand: Unable to register MTD device\n");
err = -ENODEV;
goto out_lpc;
}
printk(KERN_INFO "PA Semi NAND flash at %08lx, control at I/O %x\n",
res.start, lpcctl);
return 0;
out_lpc:
release_region(lpcctl, 4);
out_ior:
iounmap(chip->IO_ADDR_R);
out_mtd:
kfree(pasemi_nand_mtd);
out:
return err;
}
static int __devexit pasemi_nand_remove(struct of_device *ofdev)
{
struct nand_chip *chip;
if (!pasemi_nand_mtd)
return 0;
chip = pasemi_nand_mtd->priv;
/* Release resources, unregister device */
nand_release(pasemi_nand_mtd);
release_region(lpcctl, 4);
iounmap(chip->IO_ADDR_R);
/* Free the MTD device structure */
kfree(pasemi_nand_mtd);
pasemi_nand_mtd = NULL;
return 0;
}
static struct of_device_id pasemi_nand_match[] =
{
{
.compatible = "pasemi,localbus-nand",
},
{},
};
MODULE_DEVICE_TABLE(of, pasemi_nand_match);
static struct of_platform_driver pasemi_nand_driver =
{
.name = (char*)driver_name,
.match_table = pasemi_nand_match,
.probe = pasemi_nand_probe,
.remove = pasemi_nand_remove,
};
static int __init pasemi_nand_init(void)
{
return of_register_platform_driver(&pasemi_nand_driver);
}
module_init(pasemi_nand_init);
static void __exit pasemi_nand_exit(void)
{
of_unregister_platform_driver(&pasemi_nand_driver);
}
module_exit(pasemi_nand_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>");
MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient");
