[net-next-2.6.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/libata.h>
#include <scsi/scsi_host.h>

#include <asm/gpio.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)) {
		set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
		ata_sff_interrupt(info->irq, dev_instance);
	} else {
		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->flags	= ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;

	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 __devinit 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 __devexit 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;
}

/* work with hotplug and coldplug */
MODULE_ALIAS("platform:" DRV_NAME);

static struct platform_driver rb532_pata_platform_driver = {
	.probe		= rb532_pata_driver_probe,
	.remove		= __devexit_p(rb532_pata_driver_remove),
	.driver	 = {
		.name   = DRV_NAME,
		.owner  = THIS_MODULE,
	},
};

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

#define DRV_INFO DRV_DESC " version " DRV_VERSION

static int __init rb532_pata_module_init(void)
{
	printk(KERN_INFO DRV_INFO "\n");

	return platform_driver_register(&rb532_pata_platform_driver);
}

static void __exit rb532_pata_module_exit(void)
{
	platform_driver_unregister(&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_init(rb532_pata_module_init);
module_exit(rb532_pata_module_exit);
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>
	30
	31	#include <linux/libata.h>
	32	#include <scsi/scsi_host.h>
	33
	34	#include <asm/gpio.h>
	35
3dd654bf	36	#define DRV_NAME "pata-rb532-cf"
3db691da FF	37	#define DRV_VERSION "0.1.0"
	38	#define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash"
	39
	40	#define RB500_CF_MAXPORTS 1
	41	#define RB500_CF_IO_DELAY 400
	42
9f14786e PS	43	#define RB500_CF_REG_BASE 0x0800
9f14786e PS	44	#define RB500_CF_REG_ERR 0x080D
3db691da	45	#define RB500_CF_REG_CTRL 0x080E
9f14786e PS	46	/* 32bit buffered data register offset */
9f14786e PS	47	#define RB500_CF_REG_DBUF32 0x0C00
3db691da	48
3dd654bf	49	struct rb532_cf_info {
3db691da FF	50	void __iomem *iobase;
3db691da FF	51	unsigned int gpio_line;
3db691da FF	52	unsigned int irq;
	53	};
	54
	55	/* ------------------------------------------------------------------------ */
	56
3dd654bf	57	static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
3db691da FF	58	{
3db691da FF	59	struct ata_host *ah = dev_instance;
3dd654bf	60	struct rb532_cf_info *info = ah->private_data;
3db691da FF	61
	62	if (gpio_get_value(info->gpio_line)) {
	63	set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
6be976e7	64	ata_sff_interrupt(info->irq, dev_instance);
3db691da FF	65	} else {
	66	set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
	67	}
	68
	69	return IRQ_HANDLED;
	70	}
	71
3dd654bf	72	static struct ata_port_operations rb532_pata_port_ops = {
029cfd6b	73	.inherits = &ata_sff_port_ops,
180bd147	74	.sff_data_xfer = ata_sff_data_xfer32,
3db691da FF	75	};
	76
	77	/* ------------------------------------------------------------------------ */
	78
3dd654bf	79	static struct scsi_host_template rb532_pata_sht = {
68d1d07b	80	ATA_PIO_SHT(DRV_NAME),
3db691da FF	81	};
	82
	83	/* ------------------------------------------------------------------------ */
	84
3dd654bf	85	static void rb532_pata_setup_ports(struct ata_host *ah)
3db691da	86	{
3dd654bf	87	struct rb532_cf_info *info = ah->private_data;
3db691da FF	88	struct ata_port *ap;
	89
	90	ap = ah->ports[0];
	91
3dd654bf	92	ap->ops = &rb532_pata_port_ops;
14bdef98	93	ap->pio_mask = ATA_PIO4;
3db691da FF	94	ap->flags = ATA_FLAG_NO_LEGACY \| ATA_FLAG_MMIO;
3db691da FF	95
9f14786e	96	ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE;
3db691da FF	97	ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL;
	98	ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
	99
9363c382	100	ata_sff_std_ports(&ap->ioaddr);
3db691da	101
9f14786e PS	102	ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32;
9f14786e PS	103	ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR;
3db691da FF	104	}
3db691da FF	105
3dd654bf	106	static __devinit int rb532_pata_driver_probe(struct platform_device *pdev)
3db691da	107	{
9223d01b	108	int irq;
3db691da FF	109	int gpio;
	110	struct resource *res;
	111	struct ata_host *ah;
3dd654bf	112	struct rb532_cf_info *info;
3db691da FF	113	int ret;
	114
	115	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	116	if (!res) {
	117	dev_err(&pdev->dev, "no IOMEM resource found\n");
	118	return -EINVAL;
	119	}
	120
	121	irq = platform_get_irq(pdev, 0);
	122	if (irq <= 0) {
	123	dev_err(&pdev->dev, "no IRQ resource found\n");
	124	return -ENOENT;
	125	}
	126
	127	gpio = irq_to_gpio(irq);
	128	if (gpio < 0) {
	129	dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
	130	return -ENOENT;
	131	}
	132
	133	ret = gpio_request(gpio, DRV_NAME);
	134	if (ret) {
	135	dev_err(&pdev->dev, "GPIO request failed\n");
	136	return ret;
	137	}
	138
	139	/* allocate host */
	140	ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
	141	if (!ah)
	142	return -ENOMEM;
	143
	144	platform_set_drvdata(pdev, ah);
	145
	146	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
	147	if (!info)
	148	return -ENOMEM;
	149
	150	ah->private_data = info;
	151	info->gpio_line = gpio;
	152	info->irq = irq;
	153
	154	info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
041b5eac	155	resource_size(res));
3db691da FF	156	if (!info->iobase)
	157	return -ENOMEM;
	158
	159	ret = gpio_direction_input(gpio);
	160	if (ret) {
	161	dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
	162	ret);
	163	goto err_free_gpio;
	164	}
	165
3dd654bf	166	rb532_pata_setup_ports(ah);
3db691da	167
3dd654bf RB	168	ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
3dd654bf RB	169	IRQF_TRIGGER_LOW, &rb532_pata_sht);
3db691da FF	170	if (ret)
	171	goto err_free_gpio;
	172
	173	return 0;
	174
	175	err_free_gpio:
	176	gpio_free(gpio);
	177
	178	return ret;
	179	}
	180
3dd654bf	181	static __devexit int rb532_pata_driver_remove(struct platform_device *pdev)
3db691da FF	182	{
3db691da FF	183	struct ata_host *ah = platform_get_drvdata(pdev);
3dd654bf	184	struct rb532_cf_info *info = ah->private_data;
3db691da FF	185
	186	ata_host_detach(ah);
	187	gpio_free(info->gpio_line);
	188
	189	return 0;
	190	}
	191
458622fc KS	192	/* work with hotplug and coldplug */
	193	MODULE_ALIAS("platform:" DRV_NAME);
	194
3dd654bf RB	195	static struct platform_driver rb532_pata_platform_driver = {
	196	.probe = rb532_pata_driver_probe,
	197	.remove = __devexit_p(rb532_pata_driver_remove),
3db691da FF	198	.driver = {
	199	.name = DRV_NAME,
	200	.owner = THIS_MODULE,
	201	},
	202	};
	203
	204	/* ------------------------------------------------------------------------ */
	205
	206	#define DRV_INFO DRV_DESC " version " DRV_VERSION
	207
3dd654bf	208	static int __init rb532_pata_module_init(void)
3db691da FF	209	{
	210	printk(KERN_INFO DRV_INFO "\n");
	211
3dd654bf	212	return platform_driver_register(&rb532_pata_platform_driver);
3db691da FF	213	}
3db691da FF	214
3dd654bf	215	static void __exit rb532_pata_module_exit(void)
3db691da	216	{
3dd654bf	217	platform_driver_unregister(&rb532_pata_platform_driver);
3db691da FF	218	}
	219
	220	MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
	221	MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
	222	MODULE_DESCRIPTION(DRV_DESC);
	223	MODULE_VERSION(DRV_VERSION);
	224	MODULE_LICENSE("GPL");
	225
3dd654bf RB	226	module_init(rb532_pata_module_init);
3dd654bf RB	227	module_exit(rb532_pata_module_exit);