[deliverable/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/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;
	int		frozen;
	unsigned int	irq;
};

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

static void rb532_pata_freeze(struct ata_port *ap)
{
	struct rb532_cf_info *info = ap->host->private_data;

	info->frozen = 1;
}

static void rb532_pata_thaw(struct ata_port *ap)
{
	struct rb532_cf_info *info = ap->host->private_data;

	info->frozen = 0;
}

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);
		if (!info->frozen)
			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,
	.freeze			= rb532_pata_freeze,
	.thaw			= rb532_pata_thaw,
};

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

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	= 0x1f; /* 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)
{
	unsigned 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,
				res->end - res->start + 1);
	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
	22	#include <linux/kernel.h>
	23	#include <linux/module.h>
	24	#include <linux/platform_device.h>
	25
	26	#include <linux/io.h>
	27	#include <linux/interrupt.h>
	28	#include <linux/irq.h>
	29
	30	#include <linux/libata.h>
	31	#include <scsi/scsi_host.h>
	32
	33	#include <asm/gpio.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;
	50	unsigned int gpio_line;
	51	int frozen;
	52	unsigned int irq;
	53	};
	54
	55	/* ------------------------------------------------------------------------ */
	56
3dd654bf	57	static void rb532_pata_freeze(struct ata_port *ap)
3db691da	58	{
3dd654bf	59	struct rb532_cf_info *info = ap->host->private_data;
3db691da FF	60
	61	info->frozen = 1;
	62	}
	63
3dd654bf	64	static void rb532_pata_thaw(struct ata_port *ap)
3db691da	65	{
3dd654bf	66	struct rb532_cf_info *info = ap->host->private_data;
3db691da FF	67
	68	info->frozen = 0;
	69	}
	70
3dd654bf	71	static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
3db691da FF	72	{
3db691da FF	73	struct ata_host *ah = dev_instance;
3dd654bf	74	struct rb532_cf_info *info = ah->private_data;
3db691da FF	75
	76	if (gpio_get_value(info->gpio_line)) {
	77	set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
	78	if (!info->frozen)
9363c382	79	ata_sff_interrupt(info->irq, dev_instance);
3db691da FF	80	} else {
	81	set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
	82	}
	83
	84	return IRQ_HANDLED;
	85	}
	86
3dd654bf	87	static struct ata_port_operations rb532_pata_port_ops = {
029cfd6b	88	.inherits = &ata_sff_port_ops,
180bd147	89	.sff_data_xfer = ata_sff_data_xfer32,
3dd654bf RB	90	.freeze = rb532_pata_freeze,
3dd654bf RB	91	.thaw = rb532_pata_thaw,
3db691da FF	92	};
	93
	94	/* ------------------------------------------------------------------------ */
	95
3dd654bf	96	static struct scsi_host_template rb532_pata_sht = {
68d1d07b	97	ATA_PIO_SHT(DRV_NAME),
3db691da FF	98	};
	99
	100	/* ------------------------------------------------------------------------ */
	101
3dd654bf	102	static void rb532_pata_setup_ports(struct ata_host *ah)
3db691da	103	{
3dd654bf	104	struct rb532_cf_info *info = ah->private_data;
3db691da FF	105	struct ata_port *ap;
	106
	107	ap = ah->ports[0];
	108
3dd654bf	109	ap->ops = &rb532_pata_port_ops;
3db691da FF	110	ap->pio_mask = 0x1f; /* PIO4 */
	111	ap->flags = ATA_FLAG_NO_LEGACY \| ATA_FLAG_MMIO;
	112
9f14786e	113	ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE;
3db691da FF	114	ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL;
	115	ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
	116
9363c382	117	ata_sff_std_ports(&ap->ioaddr);
3db691da	118
9f14786e PS	119	ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32;
9f14786e PS	120	ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR;
3db691da FF	121	}
3db691da FF	122
3dd654bf	123	static __devinit int rb532_pata_driver_probe(struct platform_device *pdev)
3db691da FF	124	{
	125	unsigned int irq;
	126	int gpio;
	127	struct resource *res;
	128	struct ata_host *ah;
3dd654bf	129	struct rb532_cf_info *info;
3db691da FF	130	int ret;
	131
	132	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	133	if (!res) {
	134	dev_err(&pdev->dev, "no IOMEM resource found\n");
	135	return -EINVAL;
	136	}
	137
	138	irq = platform_get_irq(pdev, 0);
	139	if (irq <= 0) {
	140	dev_err(&pdev->dev, "no IRQ resource found\n");
	141	return -ENOENT;
	142	}
	143
	144	gpio = irq_to_gpio(irq);
	145	if (gpio < 0) {
	146	dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
	147	return -ENOENT;
	148	}
	149
	150	ret = gpio_request(gpio, DRV_NAME);
	151	if (ret) {
	152	dev_err(&pdev->dev, "GPIO request failed\n");
	153	return ret;
	154	}
	155
	156	/* allocate host */
	157	ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
	158	if (!ah)
	159	return -ENOMEM;
	160
	161	platform_set_drvdata(pdev, ah);
	162
	163	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
	164	if (!info)
	165	return -ENOMEM;
	166
	167	ah->private_data = info;
	168	info->gpio_line = gpio;
	169	info->irq = irq;
	170
	171	info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
	172	res->end - res->start + 1);
	173	if (!info->iobase)
	174	return -ENOMEM;
	175
	176	ret = gpio_direction_input(gpio);
	177	if (ret) {
	178	dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
	179	ret);
	180	goto err_free_gpio;
	181	}
	182
3dd654bf	183	rb532_pata_setup_ports(ah);
3db691da	184
3dd654bf RB	185	ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
3dd654bf RB	186	IRQF_TRIGGER_LOW, &rb532_pata_sht);
3db691da FF	187	if (ret)
	188	goto err_free_gpio;
	189
	190	return 0;
	191
	192	err_free_gpio:
	193	gpio_free(gpio);
	194
	195	return ret;
	196	}
	197
3dd654bf	198	static __devexit int rb532_pata_driver_remove(struct platform_device *pdev)
3db691da FF	199	{
3db691da FF	200	struct ata_host *ah = platform_get_drvdata(pdev);
3dd654bf	201	struct rb532_cf_info *info = ah->private_data;
3db691da FF	202
	203	ata_host_detach(ah);
	204	gpio_free(info->gpio_line);
	205
	206	return 0;
	207	}
	208
458622fc KS	209	/* work with hotplug and coldplug */
	210	MODULE_ALIAS("platform:" DRV_NAME);
	211
3dd654bf RB	212	static struct platform_driver rb532_pata_platform_driver = {
	213	.probe = rb532_pata_driver_probe,
	214	.remove = __devexit_p(rb532_pata_driver_remove),
3db691da FF	215	.driver = {
	216	.name = DRV_NAME,
	217	.owner = THIS_MODULE,
	218	},
	219	};
	220
	221	/* ------------------------------------------------------------------------ */
	222
	223	#define DRV_INFO DRV_DESC " version " DRV_VERSION
	224
3dd654bf	225	static int __init rb532_pata_module_init(void)
3db691da FF	226	{
	227	printk(KERN_INFO DRV_INFO "\n");
	228
3dd654bf	229	return platform_driver_register(&rb532_pata_platform_driver);
3db691da FF	230	}
3db691da FF	231
3dd654bf	232	static void __exit rb532_pata_module_exit(void)
3db691da	233	{
3dd654bf	234	platform_driver_unregister(&rb532_pata_platform_driver);
3db691da FF	235	}
	236
	237	MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
	238	MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
	239	MODULE_DESCRIPTION(DRV_DESC);
	240	MODULE_VERSION(DRV_VERSION);
	241	MODULE_LICENSE("GPL");
	242
3dd654bf RB	243	module_init(rb532_pata_module_init);
3dd654bf RB	244	module_exit(rb532_pata_module_exit);