[people/ms/linux.git] / drivers / ata / pata_rb532_cf.c

/*
 *  A low-level PATA driver to handle a Compact Flash connected on the
 *  Mikrotik's RouterBoard 532 board.
 *
 *  Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
 *  Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
 *
 *  This file was based on: drivers/ata/pata_ixp4xx_cf.c
 *	Copyright (C) 2006-07 Tower Technologies
 *	Author: Alessandro Zummo <a.zummo@towertech.it>
 *
 *  Also was based on the driver for Linux 2.4.xx published by Mikrotik for
 *  their RouterBoard 1xx and 5xx series devices. The original Mikrotik code
 *  seems not to have a license.
 *
 *  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.
 *
 */

#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/gpio.h>

#include <linux/libata.h>
#include <scsi/scsi_host.h>

#define DRV_NAME	"pata-rb532-cf"
#define DRV_VERSION	"0.1.0"
#define DRV_DESC	"PATA driver for RouterBOARD 532 Compact Flash"

#define RB500_CF_MAXPORTS	1
#define RB500_CF_IO_DELAY	400

#define RB500_CF_REG_BASE	0x0800
#define RB500_CF_REG_ERR	0x080D
#define RB500_CF_REG_CTRL	0x080E
/* 32bit buffered data register offset */
#define RB500_CF_REG_DBUF32	0x0C00

struct rb532_cf_info {
	void __iomem	*iobase;
	unsigned int	gpio_line;
	unsigned int	irq;
};

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

static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
{
	struct ata_host *ah = dev_instance;
	struct rb532_cf_info *info = ah->private_data;

	if (gpio_get_value(info->gpio_line)) {
		irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
		ata_sff_interrupt(info->irq, dev_instance);
	} else {
		irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
	}

	return IRQ_HANDLED;
}

static struct ata_port_operations rb532_pata_port_ops = {
	.inherits		= &ata_sff_port_ops,
	.sff_data_xfer		= ata_sff_data_xfer32,
};

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

static struct scsi_host_template rb532_pata_sht = {
	ATA_PIO_SHT(DRV_NAME),
};

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

static void rb532_pata_setup_ports(struct ata_host *ah)
{
	struct rb532_cf_info *info = ah->private_data;
	struct ata_port *ap;

	ap = ah->ports[0];

	ap->ops		= &rb532_pata_port_ops;
	ap->pio_mask	= ATA_PIO4;

	ap->ioaddr.cmd_addr	= info->iobase + RB500_CF_REG_BASE;
	ap->ioaddr.ctl_addr	= info->iobase + RB500_CF_REG_CTRL;
	ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;

	ata_sff_std_ports(&ap->ioaddr);

	ap->ioaddr.data_addr	= info->iobase + RB500_CF_REG_DBUF32;
	ap->ioaddr.error_addr	= info->iobase + RB500_CF_REG_ERR;
}

static int rb532_pata_driver_probe(struct platform_device *pdev)
{
	int irq;
	int gpio;
	struct resource *res;
	struct ata_host *ah;
	struct rb532_cf_info *info;
	int ret;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "no IOMEM resource found\n");
		return -EINVAL;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq <= 0) {
		dev_err(&pdev->dev, "no IRQ resource found\n");
		return -ENOENT;
	}

	gpio = irq_to_gpio(irq);
	if (gpio < 0) {
		dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
		return -ENOENT;
	}

	ret = gpio_request(gpio, DRV_NAME);
	if (ret) {
		dev_err(&pdev->dev, "GPIO request failed\n");
		return ret;
	}

	/* allocate host */
	ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
	if (!ah)
		return -ENOMEM;

	platform_set_drvdata(pdev, ah);

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

	ah->private_data = info;
	info->gpio_line = gpio;
	info->irq = irq;

	info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
				resource_size(res));
	if (!info->iobase)
		return -ENOMEM;

	ret = gpio_direction_input(gpio);
	if (ret) {
		dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
				ret);
		goto err_free_gpio;
	}

	rb532_pata_setup_ports(ah);

	ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
				IRQF_TRIGGER_LOW, &rb532_pata_sht);
	if (ret)
		goto err_free_gpio;

	return 0;

err_free_gpio:
	gpio_free(gpio);

	return ret;
}

static int rb532_pata_driver_remove(struct platform_device *pdev)
{
	struct ata_host *ah = platform_get_drvdata(pdev);
	struct rb532_cf_info *info = ah->private_data;

	ata_host_detach(ah);
	gpio_free(info->gpio_line);

	return 0;
}

static struct platform_driver rb532_pata_platform_driver = {
	.probe		= rb532_pata_driver_probe,
	.remove		= rb532_pata_driver_remove,
	.driver	 = {
		.name   = DRV_NAME,
	},
};

#define DRV_INFO DRV_DESC " version " DRV_VERSION

module_platform_driver(rb532_pata_platform_driver);

MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
MODULE_DESCRIPTION(DRV_DESC);
MODULE_VERSION(DRV_VERSION);
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
Commit	Line	Data
3db691da FF	1	/*
	2	* A low-level PATA driver to handle a Compact Flash connected on the
	3	* Mikrotik's RouterBoard 532 board.
	4	*
	5	* Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
	6	* Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
	7	*
	8	* This file was based on: drivers/ata/pata_ixp4xx_cf.c
	9	* Copyright (C) 2006-07 Tower Technologies
	10	* Author: Alessandro Zummo <a.zummo@towertech.it>
	11	*
	12	* Also was based on the driver for Linux 2.4.xx published by Mikrotik for
	13	* their RouterBoard 1xx and 5xx series devices. The original Mikrotik code
	14	* seems not to have a license.
	15	*
	16	* This program is free software; you can redistribute it and/or modify
	17	* it under the terms of the GNU General Public License version 2 as
	18	* published by the Free Software Foundation.
	19	*
	20	*/
	21
5a0e3ad6	22	#include <linux/gfp.h>
3db691da FF	23	#include <linux/kernel.h>
	24	#include <linux/module.h>
	25	#include <linux/platform_device.h>
	26
	27	#include <linux/io.h>
	28	#include <linux/interrupt.h>
	29	#include <linux/irq.h>
832f5dac	30	#include <linux/gpio.h>
3db691da FF	31
	32	#include <linux/libata.h>
	33	#include <scsi/scsi_host.h>
	34
3dd654bf	35	#define DRV_NAME "pata-rb532-cf"
3db691da FF	36	#define DRV_VERSION "0.1.0"
	37	#define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash"
	38
	39	#define RB500_CF_MAXPORTS 1
	40	#define RB500_CF_IO_DELAY 400
	41
9f14786e PS	42	#define RB500_CF_REG_BASE 0x0800
9f14786e PS	43	#define RB500_CF_REG_ERR 0x080D
3db691da	44	#define RB500_CF_REG_CTRL 0x080E
9f14786e PS	45	/* 32bit buffered data register offset */
9f14786e PS	46	#define RB500_CF_REG_DBUF32 0x0C00
3db691da	47
3dd654bf	48	struct rb532_cf_info {
3db691da FF	49	void __iomem *iobase;
3db691da FF	50	unsigned int gpio_line;
3db691da FF	51	unsigned int irq;
	52	};
	53
	54	/* ------------------------------------------------------------------------ */
	55
3dd654bf	56	static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
3db691da FF	57	{
3db691da FF	58	struct ata_host *ah = dev_instance;
3dd654bf	59	struct rb532_cf_info *info = ah->private_data;
3db691da FF	60
3db691da FF	61	if (gpio_get_value(info->gpio_line)) {
dced35ae	62	irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
6be976e7	63	ata_sff_interrupt(info->irq, dev_instance);
3db691da	64	} else {
dced35ae	65	irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
3db691da FF	66	}
	67
	68	return IRQ_HANDLED;
	69	}
	70
3dd654bf	71	static struct ata_port_operations rb532_pata_port_ops = {
029cfd6b	72	.inherits = &ata_sff_port_ops,
180bd147	73	.sff_data_xfer = ata_sff_data_xfer32,
3db691da FF	74	};
	75
	76	/* ------------------------------------------------------------------------ */
	77
3dd654bf	78	static struct scsi_host_template rb532_pata_sht = {
68d1d07b	79	ATA_PIO_SHT(DRV_NAME),
3db691da FF	80	};
	81
	82	/* ------------------------------------------------------------------------ */
	83
3dd654bf	84	static void rb532_pata_setup_ports(struct ata_host *ah)
3db691da	85	{
3dd654bf	86	struct rb532_cf_info *info = ah->private_data;
3db691da FF	87	struct ata_port *ap;
	88
	89	ap = ah->ports[0];
	90
3dd654bf	91	ap->ops = &rb532_pata_port_ops;
14bdef98	92	ap->pio_mask = ATA_PIO4;
3db691da	93
9f14786e	94	ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE;
3db691da FF	95	ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL;
	96	ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
	97
9363c382	98	ata_sff_std_ports(&ap->ioaddr);
3db691da	99
9f14786e PS	100	ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32;
9f14786e PS	101	ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR;
3db691da FF	102	}
3db691da FF	103
0ec24914	104	static int rb532_pata_driver_probe(struct platform_device *pdev)
3db691da	105	{
9223d01b	106	int irq;
3db691da FF	107	int gpio;
	108	struct resource *res;
	109	struct ata_host *ah;
3dd654bf	110	struct rb532_cf_info *info;
3db691da FF	111	int ret;
	112
	113	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	114	if (!res) {
	115	dev_err(&pdev->dev, "no IOMEM resource found\n");
	116	return -EINVAL;
	117	}
	118
	119	irq = platform_get_irq(pdev, 0);
	120	if (irq <= 0) {
	121	dev_err(&pdev->dev, "no IRQ resource found\n");
	122	return -ENOENT;
	123	}
	124
	125	gpio = irq_to_gpio(irq);
	126	if (gpio < 0) {
	127	dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
	128	return -ENOENT;
	129	}
	130
	131	ret = gpio_request(gpio, DRV_NAME);
	132	if (ret) {
	133	dev_err(&pdev->dev, "GPIO request failed\n");
	134	return ret;
	135	}
	136
	137	/* allocate host */
	138	ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
	139	if (!ah)
	140	return -ENOMEM;
	141
	142	platform_set_drvdata(pdev, ah);
	143
	144	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
	145	if (!info)
	146	return -ENOMEM;
	147
	148	ah->private_data = info;
	149	info->gpio_line = gpio;
	150	info->irq = irq;
	151
	152	info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
041b5eac	153	resource_size(res));
3db691da FF	154	if (!info->iobase)
	155	return -ENOMEM;
	156
	157	ret = gpio_direction_input(gpio);
	158	if (ret) {
	159	dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
	160	ret);
	161	goto err_free_gpio;
	162	}
	163
3dd654bf	164	rb532_pata_setup_ports(ah);
3db691da	165
3dd654bf RB	166	ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
3dd654bf RB	167	IRQF_TRIGGER_LOW, &rb532_pata_sht);
3db691da FF	168	if (ret)
	169	goto err_free_gpio;
	170
	171	return 0;
	172
	173	err_free_gpio:
	174	gpio_free(gpio);
	175
	176	return ret;
	177	}
	178
0ec24914	179	static int rb532_pata_driver_remove(struct platform_device *pdev)
3db691da FF	180	{
3db691da FF	181	struct ata_host *ah = platform_get_drvdata(pdev);
3dd654bf	182	struct rb532_cf_info *info = ah->private_data;
3db691da FF	183
	184	ata_host_detach(ah);
	185	gpio_free(info->gpio_line);
	186
	187	return 0;
	188	}
	189
3dd654bf RB	190	static struct platform_driver rb532_pata_platform_driver = {
3dd654bf RB	191	.probe = rb532_pata_driver_probe,
0ec24914	192	.remove = rb532_pata_driver_remove,
3db691da FF	193	.driver = {
3db691da FF	194	.name = DRV_NAME,
3db691da FF	195	},
	196	};
	197
3db691da FF	198	#define DRV_INFO DRV_DESC " version " DRV_VERSION
3db691da FF	199
99c8ea3e	200	module_platform_driver(rb532_pata_platform_driver);
3db691da FF	201
	202	MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
	203	MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
	204	MODULE_DESCRIPTION(DRV_DESC);
	205	MODULE_VERSION(DRV_VERSION);
	206	MODULE_LICENSE("GPL");
99c8ea3e	207	MODULE_ALIAS("platform:" DRV_NAME);