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/gfp.h>
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#include <linux/gpio.h>
31
32#include <linux/libata.h>
33#include <scsi/scsi_host.h>
34
35#include <asm/mach-rc32434/rb.h>
36
37#define DRV_NAME	"pata-rb532-cf"
38#define DRV_VERSION	"0.1.0"
39#define DRV_DESC	"PATA driver for RouterBOARD 532 Compact Flash"
40
41#define RB500_CF_MAXPORTS	1
42#define RB500_CF_IO_DELAY	400
43
44#define RB500_CF_REG_BASE	0x0800
45#define RB500_CF_REG_ERR	0x080D
46#define RB500_CF_REG_CTRL	0x080E
47/* 32bit buffered data register offset */
48#define RB500_CF_REG_DBUF32	0x0C00
49
50struct rb532_cf_info {
51	void __iomem	*iobase;
52	unsigned int	gpio_line;
53	unsigned int	irq;
54};
55
56/* ------------------------------------------------------------------------ */
57
58static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
59{
60	struct ata_host *ah = dev_instance;
61	struct rb532_cf_info *info = ah->private_data;
62
63	if (gpio_get_value(info->gpio_line)) {
64		irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
65		ata_sff_interrupt(info->irq, dev_instance);
66	} else {
67		irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
68	}
69
70	return IRQ_HANDLED;
71}
72
73static struct ata_port_operations rb532_pata_port_ops = {
74	.inherits		= &ata_sff_port_ops,
75	.sff_data_xfer		= ata_sff_data_xfer32,
76};
77
78/* ------------------------------------------------------------------------ */
79
80static struct scsi_host_template rb532_pata_sht = {
81	ATA_PIO_SHT(DRV_NAME),
82};
83
84/* ------------------------------------------------------------------------ */
85
86static void rb532_pata_setup_ports(struct ata_host *ah)
87{
88	struct rb532_cf_info *info = ah->private_data;
89	struct ata_port *ap;
90
91	ap = ah->ports[0];
92
93	ap->ops		= &rb532_pata_port_ops;
94	ap->pio_mask	= ATA_PIO4;
95
96	ap->ioaddr.cmd_addr	= info->iobase + RB500_CF_REG_BASE;
97	ap->ioaddr.ctl_addr	= info->iobase + RB500_CF_REG_CTRL;
98	ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
99
100	ata_sff_std_ports(&ap->ioaddr);
101
102	ap->ioaddr.data_addr	= info->iobase + RB500_CF_REG_DBUF32;
103	ap->ioaddr.error_addr	= info->iobase + RB500_CF_REG_ERR;
104}
105
106static int rb532_pata_driver_probe(struct platform_device *pdev)
107{
108	int irq;
109	int gpio;
110	struct resource *res;
111	struct ata_host *ah;
112	struct cf_device *pdata;
113	struct rb532_cf_info *info;
114	int ret;
115
116	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
117	if (!res) {
118		dev_err(&pdev->dev, "no IOMEM resource found\n");
119		return -EINVAL;
120	}
121
122	irq = platform_get_irq(pdev, 0);
123	if (irq <= 0) {
124		dev_err(&pdev->dev, "no IRQ resource found\n");
125		return -ENOENT;
126	}
127
128	pdata = dev_get_platdata(&pdev->dev);
129	if (!pdata) {
130		dev_err(&pdev->dev, "no platform data specified\n");
131		return -EINVAL;
132	}
133
134	gpio = pdata->gpio_pin;
135	if (gpio < 0) {
136		dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
137		return -ENOENT;
138	}
139
140	ret = gpio_request(gpio, DRV_NAME);
141	if (ret) {
142		dev_err(&pdev->dev, "GPIO request failed\n");
143		return ret;
144	}
145
146	/* allocate host */
147	ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
148	if (!ah)
149		return -ENOMEM;
150
151	platform_set_drvdata(pdev, ah);
152
153	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
154	if (!info)
155		return -ENOMEM;
156
157	ah->private_data = info;
158	info->gpio_line = gpio;
159	info->irq = irq;
160
161	info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
162				resource_size(res));
163	if (!info->iobase)
164		return -ENOMEM;
165
166	ret = gpio_direction_input(gpio);
167	if (ret) {
168		dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
169				ret);
170		goto err_free_gpio;
171	}
172
173	rb532_pata_setup_ports(ah);
174
175	ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
176				IRQF_TRIGGER_LOW, &rb532_pata_sht);
177	if (ret)
178		goto err_free_gpio;
179
180	return 0;
181
182err_free_gpio:
183	gpio_free(gpio);
184
185	return ret;
186}
187
188static int rb532_pata_driver_remove(struct platform_device *pdev)
189{
190	struct ata_host *ah = platform_get_drvdata(pdev);
191	struct rb532_cf_info *info = ah->private_data;
192
193	ata_host_detach(ah);
194	gpio_free(info->gpio_line);
195
196	return 0;
197}
198
199static struct platform_driver rb532_pata_platform_driver = {
200	.probe		= rb532_pata_driver_probe,
201	.remove		= rb532_pata_driver_remove,
202	.driver	 = {
203		.name   = DRV_NAME,
204	},
205};
206
207#define DRV_INFO DRV_DESC " version " DRV_VERSION
208
209module_platform_driver(rb532_pata_platform_driver);
210
211MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
212MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
213MODULE_DESCRIPTION(DRV_DESC);
214MODULE_VERSION(DRV_VERSION);
215MODULE_LICENSE("GPL");
216MODULE_ALIAS("platform:" DRV_NAME);
217