[deliverable/linux.git] / drivers / mtd / nand / tmio_nand.c

/*
 * Toshiba TMIO NAND flash controller driver
 *
 * Slightly murky pre-git history of the driver:
 *
 * Copyright (c) Ian Molton 2004, 2005, 2008
 *    Original work, independent of sharps code. Included hardware ECC support.
 *    Hard ECC did not work for writes in the early revisions.
 * Copyright (c) Dirk Opfer 2005.
 *    Modifications developed from sharps code but
 *    NOT containing any, ported onto Ians base.
 * Copyright (c) Chris Humbert 2005
 * Copyright (c) Dmitry Baryshkov 2008
 *    Minor fixes
 *
 * Parts copyright Sebastian Carlier
 *
 * This file is licensed under
 * the terms of the GNU General Public License version 2. This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 *
 */


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tmio.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/mtd/partitions.h>
#include <linux/slab.h>

/*--------------------------------------------------------------------------*/

/*
 * NAND Flash Host Controller Configuration Register
 */
#define CCR_COMMAND	0x04	/* w Command				*/
#define CCR_BASE	0x10	/* l NAND Flash Control Reg Base Addr	*/
#define CCR_INTP	0x3d	/* b Interrupt Pin			*/
#define CCR_INTE	0x48	/* b Interrupt Enable			*/
#define CCR_EC		0x4a	/* b Event Control			*/
#define CCR_ICC		0x4c	/* b Internal Clock Control		*/
#define CCR_ECCC	0x5b	/* b ECC Control			*/
#define CCR_NFTC	0x60	/* b NAND Flash Transaction Control	*/
#define CCR_NFM		0x61	/* b NAND Flash Monitor			*/
#define CCR_NFPSC	0x62	/* b NAND Flash Power Supply Control	*/
#define CCR_NFDC	0x63	/* b NAND Flash Detect Control		*/

/*
 * NAND Flash Control Register
 */
#define FCR_DATA	0x00	/* bwl Data Register			*/
#define FCR_MODE	0x04	/* b Mode Register			*/
#define FCR_STATUS	0x05	/* b Status Register			*/
#define FCR_ISR		0x06	/* b Interrupt Status Register		*/
#define FCR_IMR		0x07	/* b Interrupt Mask Register		*/

/* FCR_MODE Register Command List */
#define FCR_MODE_DATA	0x94	/* Data Data_Mode */
#define FCR_MODE_COMMAND 0x95	/* Data Command_Mode */
#define FCR_MODE_ADDRESS 0x96	/* Data Address_Mode */

#define FCR_MODE_HWECC_CALC	0xB4	/* HW-ECC Data */
#define FCR_MODE_HWECC_RESULT	0xD4	/* HW-ECC Calc result Read_Mode */
#define FCR_MODE_HWECC_RESET	0xF4	/* HW-ECC Reset */

#define FCR_MODE_POWER_ON	0x0C	/* Power Supply ON  to SSFDC card */
#define FCR_MODE_POWER_OFF	0x08	/* Power Supply OFF to SSFDC card */

#define FCR_MODE_LED_OFF	0x00	/* LED OFF */
#define FCR_MODE_LED_ON		0x04	/* LED ON */

#define FCR_MODE_EJECT_ON	0x68	/* Ejection events active  */
#define FCR_MODE_EJECT_OFF	0x08	/* Ejection events ignored */

#define FCR_MODE_LOCK		0x6C	/* Lock_Mode. Eject Switch Invalid */
#define FCR_MODE_UNLOCK		0x0C	/* UnLock_Mode. Eject Switch is valid */

#define FCR_MODE_CONTROLLER_ID	0x40	/* Controller ID Read */
#define FCR_MODE_STANDBY	0x00	/* SSFDC card Changes Standby State */

#define FCR_MODE_WE		0x80
#define FCR_MODE_ECC1		0x40
#define FCR_MODE_ECC0		0x20
#define FCR_MODE_CE		0x10
#define FCR_MODE_PCNT1		0x08
#define FCR_MODE_PCNT0		0x04
#define FCR_MODE_ALE		0x02
#define FCR_MODE_CLE		0x01

#define FCR_STATUS_BUSY		0x80

/*--------------------------------------------------------------------------*/

struct tmio_nand {
	struct mtd_info mtd;
	struct nand_chip chip;

	struct platform_device *dev;

	void __iomem *ccr;
	void __iomem *fcr;
	unsigned long fcr_base;

	unsigned int irq;

	/* for tmio_nand_read_byte */
	u8			read;
	unsigned read_good:1;
};

#define mtd_to_tmio(m)			container_of(m, struct tmio_nand, mtd)


/*--------------------------------------------------------------------------*/

static void tmio_nand_hwcontrol(struct mtd_info *mtd, int cmd,
				   unsigned int ctrl)
{
	struct tmio_nand *tmio = mtd_to_tmio(mtd);
	struct nand_chip *chip = mtd_to_nand(mtd);

	if (ctrl & NAND_CTRL_CHANGE) {
		u8 mode;

		if (ctrl & NAND_NCE) {
			mode = FCR_MODE_DATA;

			if (ctrl & NAND_CLE)
				mode |=  FCR_MODE_CLE;
			else
				mode &= ~FCR_MODE_CLE;

			if (ctrl & NAND_ALE)
				mode |=  FCR_MODE_ALE;
			else
				mode &= ~FCR_MODE_ALE;
		} else {
			mode = FCR_MODE_STANDBY;
		}

		tmio_iowrite8(mode, tmio->fcr + FCR_MODE);
		tmio->read_good = 0;
	}

	if (cmd != NAND_CMD_NONE)
		tmio_iowrite8(cmd, chip->IO_ADDR_W);
}

static int tmio_nand_dev_ready(struct mtd_info *mtd)
{
	struct tmio_nand *tmio = mtd_to_tmio(mtd);

	return !(tmio_ioread8(tmio->fcr + FCR_STATUS) & FCR_STATUS_BUSY);
}

static irqreturn_t tmio_irq(int irq, void *__tmio)
{
	struct tmio_nand *tmio = __tmio;
	struct nand_chip *nand_chip = &tmio->chip;

	/* disable RDYREQ interrupt */
	tmio_iowrite8(0x00, tmio->fcr + FCR_IMR);

	if (unlikely(!waitqueue_active(&nand_chip->controller->wq)))
		dev_warn(&tmio->dev->dev, "spurious interrupt\n");

	wake_up(&nand_chip->controller->wq);
	return IRQ_HANDLED;
}

/*
  *The TMIO core has a RDYREQ interrupt on the posedge of #SMRB.
  *This interrupt is normally disabled, but for long operations like
  *erase and write, we enable it to wake us up.  The irq handler
  *disables the interrupt.
 */
static int
tmio_nand_wait(struct mtd_info *mtd, struct nand_chip *nand_chip)
{
	struct tmio_nand *tmio = mtd_to_tmio(mtd);
	long timeout;

	/* enable RDYREQ interrupt */
	tmio_iowrite8(0x0f, tmio->fcr + FCR_ISR);
	tmio_iowrite8(0x81, tmio->fcr + FCR_IMR);

	timeout = wait_event_timeout(nand_chip->controller->wq,
		tmio_nand_dev_ready(mtd),
		msecs_to_jiffies(nand_chip->state == FL_ERASING ? 400 : 20));

	if (unlikely(!tmio_nand_dev_ready(mtd))) {
		tmio_iowrite8(0x00, tmio->fcr + FCR_IMR);
		dev_warn(&tmio->dev->dev, "still busy with %s after %d ms\n",
			nand_chip->state == FL_ERASING ? "erase" : "program",
			nand_chip->state == FL_ERASING ? 400 : 20);

	} else if (unlikely(!timeout)) {
		tmio_iowrite8(0x00, tmio->fcr + FCR_IMR);
		dev_warn(&tmio->dev->dev, "timeout waiting for interrupt\n");
	}

	nand_chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
	return nand_chip->read_byte(mtd);
}

/*
  *The TMIO controller combines two 8-bit data bytes into one 16-bit
  *word. This function separates them so nand_base.c works as expected,
  *especially its NAND_CMD_READID routines.
 *
  *To prevent stale data from being read, tmio_nand_hwcontrol() clears
  *tmio->read_good.
 */
static u_char tmio_nand_read_byte(struct mtd_info *mtd)
{
	struct tmio_nand *tmio = mtd_to_tmio(mtd);
	unsigned int data;

	if (tmio->read_good--)
		return tmio->read;

	data = tmio_ioread16(tmio->fcr + FCR_DATA);
	tmio->read = data >> 8;
	return data;
}

/*
  *The TMIO controller converts an 8-bit NAND interface to a 16-bit
  *bus interface, so all data reads and writes must be 16-bit wide.
  *Thus, we implement 16-bit versions of the read, write, and verify
  *buffer functions.
 */
static void
tmio_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
{
	struct tmio_nand *tmio = mtd_to_tmio(mtd);

	tmio_iowrite16_rep(tmio->fcr + FCR_DATA, buf, len >> 1);
}

static void tmio_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
{
	struct tmio_nand *tmio = mtd_to_tmio(mtd);

	tmio_ioread16_rep(tmio->fcr + FCR_DATA, buf, len >> 1);
}

static void tmio_nand_enable_hwecc(struct mtd_info *mtd, int mode)
{
	struct tmio_nand *tmio = mtd_to_tmio(mtd);

	tmio_iowrite8(FCR_MODE_HWECC_RESET, tmio->fcr + FCR_MODE);
	tmio_ioread8(tmio->fcr + FCR_DATA);	/* dummy read */
	tmio_iowrite8(FCR_MODE_HWECC_CALC, tmio->fcr + FCR_MODE);
}

static int tmio_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
							u_char *ecc_code)
{
	struct tmio_nand *tmio = mtd_to_tmio(mtd);
	unsigned int ecc;

	tmio_iowrite8(FCR_MODE_HWECC_RESULT, tmio->fcr + FCR_MODE);

	ecc = tmio_ioread16(tmio->fcr + FCR_DATA);
	ecc_code[1] = ecc;	/* 000-255 LP7-0 */
	ecc_code[0] = ecc >> 8;	/* 000-255 LP15-8 */
	ecc = tmio_ioread16(tmio->fcr + FCR_DATA);
	ecc_code[2] = ecc;	/* 000-255 CP5-0,11b */
	ecc_code[4] = ecc >> 8;	/* 256-511 LP7-0 */
	ecc = tmio_ioread16(tmio->fcr + FCR_DATA);
	ecc_code[3] = ecc;	/* 256-511 LP15-8 */
	ecc_code[5] = ecc >> 8;	/* 256-511 CP5-0,11b */

	tmio_iowrite8(FCR_MODE_DATA, tmio->fcr + FCR_MODE);
	return 0;
}

static int tmio_nand_correct_data(struct mtd_info *mtd, unsigned char *buf,
		unsigned char *read_ecc, unsigned char *calc_ecc)
{
	int r0, r1;

	/* assume ecc.size = 512 and ecc.bytes = 6 */
	r0 = __nand_correct_data(buf, read_ecc, calc_ecc, 256);
	if (r0 < 0)
		return r0;
	r1 = __nand_correct_data(buf + 256, read_ecc + 3, calc_ecc + 3, 256);
	if (r1 < 0)
		return r1;
	return r0 + r1;
}

static int tmio_hw_init(struct platform_device *dev, struct tmio_nand *tmio)
{
	const struct mfd_cell *cell = mfd_get_cell(dev);
	int ret;

	if (cell->enable) {
		ret = cell->enable(dev);
		if (ret)
			return ret;
	}

	/* (4Ch) CLKRUN Enable    1st spcrunc */
	tmio_iowrite8(0x81, tmio->ccr + CCR_ICC);

	/* (10h)BaseAddress    0x1000 spba.spba2 */
	tmio_iowrite16(tmio->fcr_base, tmio->ccr + CCR_BASE);
	tmio_iowrite16(tmio->fcr_base >> 16, tmio->ccr + CCR_BASE + 2);

	/* (04h)Command Register I/O spcmd */
	tmio_iowrite8(0x02, tmio->ccr + CCR_COMMAND);

	/* (62h) Power Supply Control ssmpwc */
	/* HardPowerOFF - SuspendOFF - PowerSupplyWait_4MS */
	tmio_iowrite8(0x02, tmio->ccr + CCR_NFPSC);

	/* (63h) Detect Control ssmdtc */
	tmio_iowrite8(0x02, tmio->ccr + CCR_NFDC);

	/* Interrupt status register clear sintst */
	tmio_iowrite8(0x0f, tmio->fcr + FCR_ISR);

	/* After power supply, Media are reset smode */
	tmio_iowrite8(FCR_MODE_POWER_ON, tmio->fcr + FCR_MODE);
	tmio_iowrite8(FCR_MODE_COMMAND, tmio->fcr + FCR_MODE);
	tmio_iowrite8(NAND_CMD_RESET, tmio->fcr + FCR_DATA);

	/* Standby Mode smode */
	tmio_iowrite8(FCR_MODE_STANDBY, tmio->fcr + FCR_MODE);

	mdelay(5);

	return 0;
}

static void tmio_hw_stop(struct platform_device *dev, struct tmio_nand *tmio)
{
	const struct mfd_cell *cell = mfd_get_cell(dev);

	tmio_iowrite8(FCR_MODE_POWER_OFF, tmio->fcr + FCR_MODE);
	if (cell->disable)
		cell->disable(dev);
}

static int tmio_probe(struct platform_device *dev)
{
	struct tmio_nand_data *data = dev_get_platdata(&dev->dev);
	struct resource *fcr = platform_get_resource(dev,
			IORESOURCE_MEM, 0);
	struct resource *ccr = platform_get_resource(dev,
			IORESOURCE_MEM, 1);
	int irq = platform_get_irq(dev, 0);
	struct tmio_nand *tmio;
	struct mtd_info *mtd;
	struct nand_chip *nand_chip;
	int retval;

	if (data == NULL)
		dev_warn(&dev->dev, "NULL platform data!\n");

	tmio = devm_kzalloc(&dev->dev, sizeof(*tmio), GFP_KERNEL);
	if (!tmio)
		return -ENOMEM;

	tmio->dev = dev;

	platform_set_drvdata(dev, tmio);
	mtd = &tmio->mtd;
	nand_chip = &tmio->chip;
	mtd->priv = nand_chip;
	mtd->name = "tmio-nand";
	mtd->dev.parent = &dev->dev;

	tmio->ccr = devm_ioremap(&dev->dev, ccr->start, resource_size(ccr));
	if (!tmio->ccr)
		return -EIO;

	tmio->fcr_base = fcr->start & 0xfffff;
	tmio->fcr = devm_ioremap(&dev->dev, fcr->start, resource_size(fcr));
	if (!tmio->fcr)
		return -EIO;

	retval = tmio_hw_init(dev, tmio);
	if (retval)
		return retval;

	/* Set address of NAND IO lines */
	nand_chip->IO_ADDR_R = tmio->fcr;
	nand_chip->IO_ADDR_W = tmio->fcr;

	/* Set address of hardware control function */
	nand_chip->cmd_ctrl = tmio_nand_hwcontrol;
	nand_chip->dev_ready = tmio_nand_dev_ready;
	nand_chip->read_byte = tmio_nand_read_byte;
	nand_chip->write_buf = tmio_nand_write_buf;
	nand_chip->read_buf = tmio_nand_read_buf;

	/* set eccmode using hardware ECC */
	nand_chip->ecc.mode = NAND_ECC_HW;
	nand_chip->ecc.size = 512;
	nand_chip->ecc.bytes = 6;
	nand_chip->ecc.strength = 2;
	nand_chip->ecc.hwctl = tmio_nand_enable_hwecc;
	nand_chip->ecc.calculate = tmio_nand_calculate_ecc;
	nand_chip->ecc.correct = tmio_nand_correct_data;

	if (data)
		nand_chip->badblock_pattern = data->badblock_pattern;

	/* 15 us command delay time */
	nand_chip->chip_delay = 15;

	retval = devm_request_irq(&dev->dev, irq, &tmio_irq, 0,
				  dev_name(&dev->dev), tmio);
	if (retval) {
		dev_err(&dev->dev, "request_irq error %d\n", retval);
		goto err_irq;
	}

	tmio->irq = irq;
	nand_chip->waitfunc = tmio_nand_wait;

	/* Scan to find existence of the device */
	if (nand_scan(mtd, 1)) {
		retval = -ENODEV;
		goto err_irq;
	}
	/* Register the partitions */
	retval = mtd_device_parse_register(mtd, NULL, NULL,
					   data ? data->partition : NULL,
					   data ? data->num_partitions : 0);
	if (!retval)
		return retval;

	nand_release(mtd);

err_irq:
	tmio_hw_stop(dev, tmio);
	return retval;
}

static int tmio_remove(struct platform_device *dev)
{
	struct tmio_nand *tmio = platform_get_drvdata(dev);

	nand_release(&tmio->mtd);
	tmio_hw_stop(dev, tmio);
	return 0;
}

#ifdef CONFIG_PM
static int tmio_suspend(struct platform_device *dev, pm_message_t state)
{
	const struct mfd_cell *cell = mfd_get_cell(dev);

	if (cell->suspend)
		cell->suspend(dev);

	tmio_hw_stop(dev, platform_get_drvdata(dev));
	return 0;
}

static int tmio_resume(struct platform_device *dev)
{
	const struct mfd_cell *cell = mfd_get_cell(dev);

	/* FIXME - is this required or merely another attack of the broken
	 * SHARP platform? Looks suspicious.
	 */
	tmio_hw_init(dev, platform_get_drvdata(dev));

	if (cell->resume)
		cell->resume(dev);

	return 0;
}
#else
#define tmio_suspend NULL
#define tmio_resume NULL
#endif

static struct platform_driver tmio_driver = {
	.driver.name	= "tmio-nand",
	.driver.owner	= THIS_MODULE,
	.probe		= tmio_probe,
	.remove		= tmio_remove,
	.suspend	= tmio_suspend,
	.resume		= tmio_resume,
};

module_platform_driver(tmio_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Ian Molton, Dirk Opfer, Chris Humbert, Dmitry Baryshkov");
MODULE_DESCRIPTION("NAND flash driver on Toshiba Mobile IO controller");
MODULE_ALIAS("platform:tmio-nand");
Commit	Line	Data
ec43b816 IM	1	/*
	2	* Toshiba TMIO NAND flash controller driver
	3	*
	4	* Slightly murky pre-git history of the driver:
	5	*
	6	* Copyright (c) Ian Molton 2004, 2005, 2008
25985edc	7	* Original work, independent of sharps code. Included hardware ECC support.
ec43b816 IM	8	* Hard ECC did not work for writes in the early revisions.
	9	* Copyright (c) Dirk Opfer 2005.
	10	* Modifications developed from sharps code but
	11	* NOT containing any, ported onto Ians base.
	12	* Copyright (c) Chris Humbert 2005
	13	* Copyright (c) Dmitry Baryshkov 2008
	14	* Minor fixes
	15	*
	16	* Parts copyright Sebastian Carlier
	17	*
	18	* This file is licensed under
	19	* the terms of the GNU General Public License version 2. This program
	20	* is licensed "as is" without any warranty of any kind, whether express
	21	* or implied.
	22	*
	23	*/
	24
	25
	26	#include <linux/kernel.h>
	27	#include <linux/module.h>
	28	#include <linux/platform_device.h>
	29	#include <linux/mfd/core.h>
	30	#include <linux/mfd/tmio.h>
	31	#include <linux/delay.h>
	32	#include <linux/io.h>
	33	#include <linux/irq.h>
	34	#include <linux/interrupt.h>
	35	#include <linux/ioport.h>
	36	#include <linux/mtd/mtd.h>
	37	#include <linux/mtd/nand.h>
	38	#include <linux/mtd/nand_ecc.h>
	39	#include <linux/mtd/partitions.h>
5a0e3ad6	40	#include <linux/slab.h>
ec43b816 IM	41
	42	/--------------------------------------------------------------------------/
	43
	44	/*
	45	* NAND Flash Host Controller Configuration Register
	46	*/
	47	#define CCR_COMMAND 0x04 /* w Command */
	48	#define CCR_BASE 0x10 /* l NAND Flash Control Reg Base Addr */
	49	#define CCR_INTP 0x3d /* b Interrupt Pin */
	50	#define CCR_INTE 0x48 /* b Interrupt Enable */
	51	#define CCR_EC 0x4a /* b Event Control */
	52	#define CCR_ICC 0x4c /* b Internal Clock Control */
	53	#define CCR_ECCC 0x5b /* b ECC Control */
	54	#define CCR_NFTC 0x60 /* b NAND Flash Transaction Control */
	55	#define CCR_NFM 0x61 /* b NAND Flash Monitor */
	56	#define CCR_NFPSC 0x62 /* b NAND Flash Power Supply Control */
	57	#define CCR_NFDC 0x63 /* b NAND Flash Detect Control */
	58
	59	/*
	60	* NAND Flash Control Register
	61	*/
	62	#define FCR_DATA 0x00 /* bwl Data Register */
	63	#define FCR_MODE 0x04 /* b Mode Register */
	64	#define FCR_STATUS 0x05 /* b Status Register */
	65	#define FCR_ISR 0x06 /* b Interrupt Status Register */
	66	#define FCR_IMR 0x07 /* b Interrupt Mask Register */
	67
	68	/* FCR_MODE Register Command List */
	69	#define FCR_MODE_DATA 0x94 /* Data Data_Mode */
	70	#define FCR_MODE_COMMAND 0x95 /* Data Command_Mode */
	71	#define FCR_MODE_ADDRESS 0x96 /* Data Address_Mode */
	72
	73	#define FCR_MODE_HWECC_CALC 0xB4 /* HW-ECC Data */
	74	#define FCR_MODE_HWECC_RESULT 0xD4 /* HW-ECC Calc result Read_Mode */
	75	#define FCR_MODE_HWECC_RESET 0xF4 /* HW-ECC Reset */
	76
	77	#define FCR_MODE_POWER_ON 0x0C /* Power Supply ON to SSFDC card */
	78	#define FCR_MODE_POWER_OFF 0x08 /* Power Supply OFF to SSFDC card */
	79
	80	#define FCR_MODE_LED_OFF 0x00 /* LED OFF */
	81	#define FCR_MODE_LED_ON 0x04 /* LED ON */
	82
	83	#define FCR_MODE_EJECT_ON 0x68 /* Ejection events active */
	84	#define FCR_MODE_EJECT_OFF 0x08 /* Ejection events ignored */
	85
	86	#define FCR_MODE_LOCK 0x6C /* Lock_Mode. Eject Switch Invalid */
	87	#define FCR_MODE_UNLOCK 0x0C /* UnLock_Mode. Eject Switch is valid */
	88
	89	#define FCR_MODE_CONTROLLER_ID 0x40 /* Controller ID Read */
	90	#define FCR_MODE_STANDBY 0x00 /* SSFDC card Changes Standby State */
	91
	92	#define FCR_MODE_WE 0x80
	93	#define FCR_MODE_ECC1 0x40
	94	#define FCR_MODE_ECC0 0x20
	95	#define FCR_MODE_CE 0x10
	96	#define FCR_MODE_PCNT1 0x08
	97	#define FCR_MODE_PCNT0 0x04
	98	#define FCR_MODE_ALE 0x02
	99	#define FCR_MODE_CLE 0x01
	100
	101	#define FCR_STATUS_BUSY 0x80
	102
	103	/--------------------------------------------------------------------------/
	104
105	struct tmio_nand {
106	struct mtd_info mtd;
107	struct nand_chip chip;
108
109	struct platform_device *dev;
110
111	void __iomem *ccr;
112	void __iomem *fcr;
076c7f4c	113	unsigned long fcr_base;
ec43b816 IM	114
	115	unsigned int irq;
	116
	117	/* for tmio_nand_read_byte */
	118	u8 read;
	119	unsigned read_good:1;
	120	};
	121
	122	#define mtd_to_tmio(m) container_of(m, struct tmio_nand, mtd)
	123
ec43b816 IM	124
	125	/--------------------------------------------------------------------------/
	126
	127	static void tmio_nand_hwcontrol(struct mtd_info *mtd, int cmd,
	128	unsigned int ctrl)
	129	{
	130	struct tmio_nand *tmio = mtd_to_tmio(mtd);
4bd4ebcc	131	struct nand_chip *chip = mtd_to_nand(mtd);
ec43b816 IM	132
	133	if (ctrl & NAND_CTRL_CHANGE) {
	134	u8 mode;
	135
	136	if (ctrl & NAND_NCE) {
	137	mode = FCR_MODE_DATA;
	138
	139	if (ctrl & NAND_CLE)
	140	mode \|= FCR_MODE_CLE;
	141	else
	142	mode &= ~FCR_MODE_CLE;
	143
	144	if (ctrl & NAND_ALE)
	145	mode \|= FCR_MODE_ALE;
	146	else
	147	mode &= ~FCR_MODE_ALE;
	148	} else {
	149	mode = FCR_MODE_STANDBY;
	150	}
	151
	152	tmio_iowrite8(mode, tmio->fcr + FCR_MODE);
	153	tmio->read_good = 0;
	154	}
	155
	156	if (cmd != NAND_CMD_NONE)
	157	tmio_iowrite8(cmd, chip->IO_ADDR_W);
	158	}
	159
	160	static int tmio_nand_dev_ready(struct mtd_info *mtd)
	161	{
	162	struct tmio_nand *tmio = mtd_to_tmio(mtd);
	163
	164	return !(tmio_ioread8(tmio->fcr + FCR_STATUS) & FCR_STATUS_BUSY);
	165	}
	166
	167	static irqreturn_t tmio_irq(int irq, void *__tmio)
	168	{
	169	struct tmio_nand *tmio = __tmio;
	170	struct nand_chip *nand_chip = &tmio->chip;
	171
	172	/* disable RDYREQ interrupt */
	173	tmio_iowrite8(0x00, tmio->fcr + FCR_IMR);
	174
	175	if (unlikely(!waitqueue_active(&nand_chip->controller->wq)))
	176	dev_warn(&tmio->dev->dev, "spurious interrupt\n");
	177
	178	wake_up(&nand_chip->controller->wq);
	179	return IRQ_HANDLED;
	180	}
	181
	182	/*
	183	*The TMIO core has a RDYREQ interrupt on the posedge of #SMRB.
	184	*This interrupt is normally disabled, but for long operations like
	185	*erase and write, we enable it to wake us up. The irq handler
	186	*disables the interrupt.
	187	*/
	188	static int
	189	tmio_nand_wait(struct mtd_info mtd, struct nand_chip nand_chip)
	190	{
	191	struct tmio_nand *tmio = mtd_to_tmio(mtd);
	192	long timeout;
	193
	194	/* enable RDYREQ interrupt */
	195	tmio_iowrite8(0x0f, tmio->fcr + FCR_ISR);
196	tmio_iowrite8(0x81, tmio->fcr + FCR_IMR);
197
198	timeout = wait_event_timeout(nand_chip->controller->wq,
199	tmio_nand_dev_ready(mtd),
200	msecs_to_jiffies(nand_chip->state == FL_ERASING ? 400 : 20));
201
202	if (unlikely(!tmio_nand_dev_ready(mtd))) {
203	tmio_iowrite8(0x00, tmio->fcr + FCR_IMR);
204	dev_warn(&tmio->dev->dev, "still busy with %s after %d ms\n",
205	nand_chip->state == FL_ERASING ? "erase" : "program",
206	nand_chip->state == FL_ERASING ? 400 : 20);
207
208	} else if (unlikely(!timeout)) {
209	tmio_iowrite8(0x00, tmio->fcr + FCR_IMR);
210	dev_warn(&tmio->dev->dev, "timeout waiting for interrupt\n");
211	}
212
213	nand_chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
214	return nand_chip->read_byte(mtd);
215	}
216
217	/*
218	*The TMIO controller combines two 8-bit data bytes into one 16-bit
219	*word. This function separates them so nand_base.c works as expected,
220	*especially its NAND_CMD_READID routines.
221	*
222	*To prevent stale data from being read, tmio_nand_hwcontrol() clears
223	*tmio->read_good.
224	*/
225	static u_char tmio_nand_read_byte(struct mtd_info *mtd)
226	{
227	struct tmio_nand *tmio = mtd_to_tmio(mtd);
228	unsigned int data;
229
230	if (tmio->read_good--)
231	return tmio->read;
232
233	data = tmio_ioread16(tmio->fcr + FCR_DATA);
234	tmio->read = data >> 8;
235	return data;
236	}
237
238	/*
239	*The TMIO controller converts an 8-bit NAND interface to a 16-bit
240	*bus interface, so all data reads and writes must be 16-bit wide.
241	*Thus, we implement 16-bit versions of the read, write, and verify
242	*buffer functions.
243	*/
244	static void
245	tmio_nand_write_buf(struct mtd_info mtd, const u_char buf, int len)
246	{
247	struct tmio_nand *tmio = mtd_to_tmio(mtd);
248
249	tmio_iowrite16_rep(tmio->fcr + FCR_DATA, buf, len >> 1);
250	}
251
252	static void tmio_nand_read_buf(struct mtd_info mtd, u_char buf, int len)
253	{
254	struct tmio_nand *tmio = mtd_to_tmio(mtd);
255
256	tmio_ioread16_rep(tmio->fcr + FCR_DATA, buf, len >> 1);
257	}
258
ec43b816 IM	259	static void tmio_nand_enable_hwecc(struct mtd_info *mtd, int mode)
	260	{
	261	struct tmio_nand *tmio = mtd_to_tmio(mtd);
	262
	263	tmio_iowrite8(FCR_MODE_HWECC_RESET, tmio->fcr + FCR_MODE);
	264	tmio_ioread8(tmio->fcr + FCR_DATA); /* dummy read */
	265	tmio_iowrite8(FCR_MODE_HWECC_CALC, tmio->fcr + FCR_MODE);
	266	}
	267
	268	static int tmio_nand_calculate_ecc(struct mtd_info mtd, const u_char dat,
	269	u_char *ecc_code)
	270	{
	271	struct tmio_nand *tmio = mtd_to_tmio(mtd);
	272	unsigned int ecc;
	273
	274	tmio_iowrite8(FCR_MODE_HWECC_RESULT, tmio->fcr + FCR_MODE);
	275
	276	ecc = tmio_ioread16(tmio->fcr + FCR_DATA);
	277	ecc_code[1] = ecc; /* 000-255 LP7-0 */
	278	ecc_code[0] = ecc >> 8; /* 000-255 LP15-8 */
	279	ecc = tmio_ioread16(tmio->fcr + FCR_DATA);
	280	ecc_code[2] = ecc; /* 000-255 CP5-0,11b */
	281	ecc_code[4] = ecc >> 8; /* 256-511 LP7-0 */
	282	ecc = tmio_ioread16(tmio->fcr + FCR_DATA);
	283	ecc_code[3] = ecc; /* 256-511 LP15-8 */
	284	ecc_code[5] = ecc >> 8; /* 256-511 CP5-0,11b */
	285
	286	tmio_iowrite8(FCR_MODE_DATA, tmio->fcr + FCR_MODE);
	287	return 0;
	288	}
	289
0f777fb9 AN	290	static int tmio_nand_correct_data(struct mtd_info mtd, unsigned char buf,
	291	unsigned char read_ecc, unsigned char calc_ecc)
	292	{
	293	int r0, r1;
	294
	295	/* assume ecc.size = 512 and ecc.bytes = 6 */
	296	r0 = __nand_correct_data(buf, read_ecc, calc_ecc, 256);
	297	if (r0 < 0)
	298	return r0;
	299	r1 = __nand_correct_data(buf + 256, read_ecc + 3, calc_ecc + 3, 256);
	300	if (r1 < 0)
	301	return r1;
	302	return r0 + r1;
	303	}
	304
ec43b816 IM	305	static int tmio_hw_init(struct platform_device dev, struct tmio_nand tmio)
ec43b816 IM	306	{
944dc035	307	const struct mfd_cell *cell = mfd_get_cell(dev);
ec43b816 IM	308	int ret;
	309
	310	if (cell->enable) {
	311	ret = cell->enable(dev);
	312	if (ret)
	313	return ret;
	314	}
	315
	316	/* (4Ch) CLKRUN Enable 1st spcrunc */
	317	tmio_iowrite8(0x81, tmio->ccr + CCR_ICC);
	318
	319	/* (10h)BaseAddress 0x1000 spba.spba2 */
076c7f4c DB	320	tmio_iowrite16(tmio->fcr_base, tmio->ccr + CCR_BASE);
076c7f4c DB	321	tmio_iowrite16(tmio->fcr_base >> 16, tmio->ccr + CCR_BASE + 2);
ec43b816 IM	322
	323	/* (04h)Command Register I/O spcmd */
	324	tmio_iowrite8(0x02, tmio->ccr + CCR_COMMAND);
	325
	326	/* (62h) Power Supply Control ssmpwc */
	327	/* HardPowerOFF - SuspendOFF - PowerSupplyWait_4MS */
	328	tmio_iowrite8(0x02, tmio->ccr + CCR_NFPSC);
	329
	330	/* (63h) Detect Control ssmdtc */
	331	tmio_iowrite8(0x02, tmio->ccr + CCR_NFDC);
	332
	333	/* Interrupt status register clear sintst */
	334	tmio_iowrite8(0x0f, tmio->fcr + FCR_ISR);
	335
	336	/* After power supply, Media are reset smode */
	337	tmio_iowrite8(FCR_MODE_POWER_ON, tmio->fcr + FCR_MODE);
	338	tmio_iowrite8(FCR_MODE_COMMAND, tmio->fcr + FCR_MODE);
	339	tmio_iowrite8(NAND_CMD_RESET, tmio->fcr + FCR_DATA);
	340
	341	/* Standby Mode smode */
	342	tmio_iowrite8(FCR_MODE_STANDBY, tmio->fcr + FCR_MODE);
	343
	344	mdelay(5);
	345
	346	return 0;
	347	}
	348
	349	static void tmio_hw_stop(struct platform_device dev, struct tmio_nand tmio)
	350	{
944dc035	351	const struct mfd_cell *cell = mfd_get_cell(dev);
ec43b816 IM	352
	353	tmio_iowrite8(FCR_MODE_POWER_OFF, tmio->fcr + FCR_MODE);
	354	if (cell->disable)
	355	cell->disable(dev);
	356	}
	357
	358	static int tmio_probe(struct platform_device *dev)
	359	{
453810b7	360	struct tmio_nand_data *data = dev_get_platdata(&dev->dev);
ec43b816 IM	361	struct resource *fcr = platform_get_resource(dev,
	362	IORESOURCE_MEM, 0);
	363	struct resource *ccr = platform_get_resource(dev,
	364	IORESOURCE_MEM, 1);
	365	int irq = platform_get_irq(dev, 0);
	366	struct tmio_nand *tmio;
	367	struct mtd_info *mtd;
	368	struct nand_chip *nand_chip;
ec43b816 IM	369	int retval;
	370
	371	if (data == NULL)
	372	dev_warn(&dev->dev, "NULL platform data!\n");
	373
8f91fb68 JH	374	tmio = devm_kzalloc(&dev->dev, sizeof(*tmio), GFP_KERNEL);
	375	if (!tmio)
	376	return -ENOMEM;
ec43b816 IM	377
	378	tmio->dev = dev;
	379
	380	platform_set_drvdata(dev, tmio);
	381	mtd = &tmio->mtd;
	382	nand_chip = &tmio->chip;
	383	mtd->priv = nand_chip;
	384	mtd->name = "tmio-nand";
7b679053	385	mtd->dev.parent = &dev->dev;
ec43b816	386
8f91fb68 JH	387	tmio->ccr = devm_ioremap(&dev->dev, ccr->start, resource_size(ccr));
	388	if (!tmio->ccr)
	389	return -EIO;
ec43b816	390
076c7f4c	391	tmio->fcr_base = fcr->start & 0xfffff;
8f91fb68 JH	392	tmio->fcr = devm_ioremap(&dev->dev, fcr->start, resource_size(fcr));
	393	if (!tmio->fcr)
	394	return -EIO;
ec43b816 IM	395
	396	retval = tmio_hw_init(dev, tmio);
	397	if (retval)
8f91fb68	398	return retval;
ec43b816 IM	399
	400	/* Set address of NAND IO lines */
	401	nand_chip->IO_ADDR_R = tmio->fcr;
	402	nand_chip->IO_ADDR_W = tmio->fcr;
	403
	404	/* Set address of hardware control function */
	405	nand_chip->cmd_ctrl = tmio_nand_hwcontrol;
	406	nand_chip->dev_ready = tmio_nand_dev_ready;
	407	nand_chip->read_byte = tmio_nand_read_byte;
	408	nand_chip->write_buf = tmio_nand_write_buf;
	409	nand_chip->read_buf = tmio_nand_read_buf;
ec43b816 IM	410
	411	/* set eccmode using hardware ECC */
	412	nand_chip->ecc.mode = NAND_ECC_HW;
	413	nand_chip->ecc.size = 512;
	414	nand_chip->ecc.bytes = 6;
6a918bad	415	nand_chip->ecc.strength = 2;
ec43b816 IM	416	nand_chip->ecc.hwctl = tmio_nand_enable_hwecc;
ec43b816 IM	417	nand_chip->ecc.calculate = tmio_nand_calculate_ecc;
0f777fb9	418	nand_chip->ecc.correct = tmio_nand_correct_data;
ec43b816 IM	419
	420	if (data)
	421	nand_chip->badblock_pattern = data->badblock_pattern;
	422
	423	/* 15 us command delay time */
	424	nand_chip->chip_delay = 15;
	425
8f91fb68 JH	426	retval = devm_request_irq(&dev->dev, irq, &tmio_irq, 0,
8f91fb68 JH	427	dev_name(&dev->dev), tmio);
ec43b816 IM	428	if (retval) {
	429	dev_err(&dev->dev, "request_irq error %d\n", retval);
	430	goto err_irq;
	431	}
	432
	433	tmio->irq = irq;
	434	nand_chip->waitfunc = tmio_nand_wait;
	435
	436	/* Scan to find existence of the device */
	437	if (nand_scan(mtd, 1)) {
	438	retval = -ENODEV;
8f91fb68	439	goto err_irq;
ec43b816 IM	440	}
ec43b816 IM	441	/* Register the partitions */
42d7fbe2 AB	442	retval = mtd_device_parse_register(mtd, NULL, NULL,
	443	data ? data->partition : NULL,
	444	data ? data->num_partitions : 0);
ec43b816 IM	445	if (!retval)
	446	return retval;
	447
	448	nand_release(mtd);
	449
ec43b816 IM	450	err_irq:
ec43b816 IM	451	tmio_hw_stop(dev, tmio);
ec43b816 IM	452	return retval;
	453	}
	454
	455	static int tmio_remove(struct platform_device *dev)
	456	{
	457	struct tmio_nand *tmio = platform_get_drvdata(dev);
	458
	459	nand_release(&tmio->mtd);
ec43b816	460	tmio_hw_stop(dev, tmio);
ec43b816 IM	461	return 0;
	462	}
	463
	464	#ifdef CONFIG_PM
	465	static int tmio_suspend(struct platform_device *dev, pm_message_t state)
	466	{
944dc035	467	const struct mfd_cell *cell = mfd_get_cell(dev);
ec43b816 IM	468
	469	if (cell->suspend)
	470	cell->suspend(dev);
	471
	472	tmio_hw_stop(dev, platform_get_drvdata(dev));
	473	return 0;
	474	}
	475
	476	static int tmio_resume(struct platform_device *dev)
	477	{
944dc035	478	const struct mfd_cell *cell = mfd_get_cell(dev);
ec43b816 IM	479
	480	/* FIXME - is this required or merely another attack of the broken
	481	* SHARP platform? Looks suspicious.
	482	*/
	483	tmio_hw_init(dev, platform_get_drvdata(dev));
	484
	485	if (cell->resume)
	486	cell->resume(dev);
	487
	488	return 0;
	489	}
	490	#else
	491	#define tmio_suspend NULL
	492	#define tmio_resume NULL
	493	#endif
	494
	495	static struct platform_driver tmio_driver = {
	496	.driver.name = "tmio-nand",
	497	.driver.owner = THIS_MODULE,
	498	.probe = tmio_probe,
	499	.remove = tmio_remove,
	500	.suspend = tmio_suspend,
	501	.resume = tmio_resume,
	502	};
	503
f99640de	504	module_platform_driver(tmio_driver);
ec43b816 IM	505
	506	MODULE_LICENSE("GPL v2");
	507	MODULE_AUTHOR("Ian Molton, Dirk Opfer, Chris Humbert, Dmitry Baryshkov");
	508	MODULE_DESCRIPTION("NAND flash driver on Toshiba Mobile IO controller");
	509	MODULE_ALIAS("platform:tmio-nand");