[net-next-2.6.git] / drivers / mtd / nand / pasemi_nand.c

/*
 * 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 %llx-%llx\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);
	pci_dev_put(pdev);

	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 %08llx, 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 const 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");
Commit	Line	Data
846fc31d EM	1	/*
	2	* Copyright (C) 2006-2007 PA Semi, Inc
	3	*
	4	* Author: Egor Martovetsky <egor@pasemi.com>
	5	* Maintained by: Olof Johansson <olof@lixom.net>
	6	*
	7	* Driver for the PWRficient onchip NAND flash interface
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*/
	22
	23	#undef DEBUG
	24
	25	#include <linux/slab.h>
	26	#include <linux/init.h>
	27	#include <linux/module.h>
	28	#include <linux/mtd/mtd.h>
	29	#include <linux/mtd/nand.h>
	30	#include <linux/mtd/nand_ecc.h>
	31	#include <linux/of_platform.h>
	32	#include <linux/platform_device.h>
	33	#include <linux/pci.h>
	34
	35	#include <asm/io.h>
	36
	37	#define LBICTRL_LPCCTL_NR 0x00004000
	38	#define CLE_PIN_CTL 15
	39	#define ALE_PIN_CTL 14
	40
	41	static unsigned int lpcctl;
	42	static struct mtd_info *pasemi_nand_mtd;
	43	static const char driver_name[] = "pasemi-nand";
	44
	45	static void pasemi_read_buf(struct mtd_info mtd, u_char buf, int len)
	46	{
	47	struct nand_chip *chip = mtd->priv;
	48
	49	while (len > 0x800) {
	50	memcpy_fromio(buf, chip->IO_ADDR_R, 0x800);
	51	buf += 0x800;
	52	len -= 0x800;
	53	}
	54	memcpy_fromio(buf, chip->IO_ADDR_R, len);
	55	}
	56
	57	static void pasemi_write_buf(struct mtd_info mtd, const u_char buf, int len)
	58	{
	59	struct nand_chip *chip = mtd->priv;
	60
	61	while (len > 0x800) {
	62	memcpy_toio(chip->IO_ADDR_R, buf, 0x800);
	63	buf += 0x800;
	64	len -= 0x800;
65	}
66	memcpy_toio(chip->IO_ADDR_R, buf, len);
67	}
68
69	static void pasemi_hwcontrol(struct mtd_info *mtd, int cmd,
70	unsigned int ctrl)
71	{
72	struct nand_chip *chip = mtd->priv;
73
74	if (cmd == NAND_CMD_NONE)
75	return;
76
77	if (ctrl & NAND_CLE)
78	out_8(chip->IO_ADDR_W + (1 << CLE_PIN_CTL), cmd);
79	else
80	out_8(chip->IO_ADDR_W + (1 << ALE_PIN_CTL), cmd);
81
82	/* Push out posted writes */
83	eieio();
84	inl(lpcctl);
85	}
86
87	int pasemi_device_ready(struct mtd_info *mtd)
88	{
89	return !!(inl(lpcctl) & LBICTRL_LPCCTL_NR);
90	}
91
92	static int __devinit pasemi_nand_probe(struct of_device *ofdev,
93	const struct of_device_id *match)
94	{
95	struct pci_dev *pdev;
96	struct device_node *np = ofdev->node;
97	struct resource res;
98	struct nand_chip *chip;
99	int err = 0;
100
101	err = of_address_to_resource(np, 0, &res);
102
103	if (err)
104	return -EINVAL;
105
106	/* We only support one device at the moment */
107	if (pasemi_nand_mtd)
108	return -ENODEV;
109
4712fff9	110	pr_debug("pasemi_nand at %llx-%llx\n", res.start, res.end);
846fc31d EM	111
	112	/* Allocate memory for MTD device structure and private data */
	113	pasemi_nand_mtd = kzalloc(sizeof(struct mtd_info) +
	114	sizeof(struct nand_chip), GFP_KERNEL);
	115	if (!pasemi_nand_mtd) {
	116	printk(KERN_WARNING
	117	"Unable to allocate PASEMI NAND MTD device structure\n");
	118	err = -ENOMEM;
	119	goto out;
	120	}
	121
	122	/* Get pointer to private data */
	123	chip = (struct nand_chip *)&pasemi_nand_mtd[1];
	124
	125	/* Link the private data with the MTD structure */
	126	pasemi_nand_mtd->priv = chip;
	127	pasemi_nand_mtd->owner = THIS_MODULE;
	128
	129	chip->IO_ADDR_R = of_iomap(np, 0);
	130	chip->IO_ADDR_W = chip->IO_ADDR_R;
	131
	132	if (!chip->IO_ADDR_R) {
	133	err = -EIO;
	134	goto out_mtd;
	135	}
	136
	137	pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa008, NULL);
	138	if (!pdev) {
	139	err = -ENODEV;
	140	goto out_ior;
	141	}
	142
	143	lpcctl = pci_resource_start(pdev, 0);
d9476298	144	pci_dev_put(pdev);
846fc31d EM	145
	146	if (!request_region(lpcctl, 4, driver_name)) {
	147	err = -EBUSY;
	148	goto out_ior;
	149	}
	150
	151	chip->cmd_ctrl = pasemi_hwcontrol;
	152	chip->dev_ready = pasemi_device_ready;
	153	chip->read_buf = pasemi_read_buf;
	154	chip->write_buf = pasemi_write_buf;
	155	chip->chip_delay = 0;
	156	chip->ecc.mode = NAND_ECC_SOFT;
	157
	158	/* Enable the following for a flash based bad block table */
	159	chip->options = NAND_USE_FLASH_BBT \| NAND_NO_AUTOINCR;
	160
	161	/* Scan to find existance of the device */
	162	if (nand_scan(pasemi_nand_mtd, 1)) {
	163	err = -ENXIO;
	164	goto out_lpc;
	165	}
	166
	167	if (add_mtd_device(pasemi_nand_mtd)) {
	168	printk(KERN_ERR "pasemi_nand: Unable to register MTD device\n");
	169	err = -ENODEV;
	170	goto out_lpc;
	171	}
	172
4712fff9	173	printk(KERN_INFO "PA Semi NAND flash at %08llx, control at I/O %x\n",
846fc31d EM	174	res.start, lpcctl);
	175
	176	return 0;
	177
	178	out_lpc:
	179	release_region(lpcctl, 4);
	180	out_ior:
	181	iounmap(chip->IO_ADDR_R);
	182	out_mtd:
	183	kfree(pasemi_nand_mtd);
	184	out:
	185	return err;
	186	}
	187
	188	static int __devexit pasemi_nand_remove(struct of_device *ofdev)
	189	{
	190	struct nand_chip *chip;
	191
	192	if (!pasemi_nand_mtd)
	193	return 0;
	194
	195	chip = pasemi_nand_mtd->priv;
	196
	197	/* Release resources, unregister device */
	198	nand_release(pasemi_nand_mtd);
	199
	200	release_region(lpcctl, 4);
	201
	202	iounmap(chip->IO_ADDR_R);
	203
	204	/* Free the MTD device structure */
	205	kfree(pasemi_nand_mtd);
	206
	207	pasemi_nand_mtd = NULL;
	208
	209	return 0;
	210	}
	211
b2d4fbab	212	static const struct of_device_id pasemi_nand_match[] =
846fc31d EM	213	{
	214	{
	215	.compatible = "pasemi,localbus-nand",
	216	},
	217	{},
	218	};
	219
	220	MODULE_DEVICE_TABLE(of, pasemi_nand_match);
	221
	222	static struct of_platform_driver pasemi_nand_driver =
	223	{
	224	.name = (char*)driver_name,
	225	.match_table = pasemi_nand_match,
	226	.probe = pasemi_nand_probe,
	227	.remove = pasemi_nand_remove,
	228	};
	229
	230	static int __init pasemi_nand_init(void)
	231	{
	232	return of_register_platform_driver(&pasemi_nand_driver);
	233	}
	234	module_init(pasemi_nand_init);
	235
	236	static void __exit pasemi_nand_exit(void)
	237	{
	238	of_unregister_platform_driver(&pasemi_nand_driver);
	239	}
	240	module_exit(pasemi_nand_exit);
	241
	242	MODULE_LICENSE("GPL");
	243	MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>");
	244	MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient");