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Florian Fainelli3db691d2008-03-06 12:25:21 +01001/*
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
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/gfp.h>
Florian Fainelli3db691d2008-03-06 12:25:21 +010023#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
Ralf Baechle3dd654b2008-04-28 12:41:36 +010036#define DRV_NAME "pata-rb532-cf"
Florian Fainelli3db691d2008-03-06 12:25:21 +010037#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
Phil Sutter9f147862008-11-28 20:48:26 +010043#define RB500_CF_REG_BASE 0x0800
44#define RB500_CF_REG_ERR 0x080D
Florian Fainelli3db691d2008-03-06 12:25:21 +010045#define RB500_CF_REG_CTRL 0x080E
Phil Sutter9f147862008-11-28 20:48:26 +010046/* 32bit buffered data register offset */
47#define RB500_CF_REG_DBUF32 0x0C00
Florian Fainelli3db691d2008-03-06 12:25:21 +010048
Ralf Baechle3dd654b2008-04-28 12:41:36 +010049struct rb532_cf_info {
Florian Fainelli3db691d2008-03-06 12:25:21 +010050 void __iomem *iobase;
51 unsigned int gpio_line;
Florian Fainelli3db691d2008-03-06 12:25:21 +010052 unsigned int irq;
53};
54
55/* ------------------------------------------------------------------------ */
56
Ralf Baechle3dd654b2008-04-28 12:41:36 +010057static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
Florian Fainelli3db691d2008-03-06 12:25:21 +010058{
59 struct ata_host *ah = dev_instance;
Ralf Baechle3dd654b2008-04-28 12:41:36 +010060 struct rb532_cf_info *info = ah->private_data;
Florian Fainelli3db691d2008-03-06 12:25:21 +010061
62 if (gpio_get_value(info->gpio_line)) {
Thomas Gleixnerdced35a2011-03-28 17:49:12 +020063 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
Phil Sutter6be976e2009-01-27 14:35:53 +010064 ata_sff_interrupt(info->irq, dev_instance);
Florian Fainelli3db691d2008-03-06 12:25:21 +010065 } else {
Thomas Gleixnerdced35a2011-03-28 17:49:12 +020066 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
Florian Fainelli3db691d2008-03-06 12:25:21 +010067 }
68
69 return IRQ_HANDLED;
70}
71
Ralf Baechle3dd654b2008-04-28 12:41:36 +010072static struct ata_port_operations rb532_pata_port_ops = {
Tejun Heo029cfd62008-03-25 12:22:49 +090073 .inherits = &ata_sff_port_ops,
Phil Sutter180bd142009-01-27 14:35:52 +010074 .sff_data_xfer = ata_sff_data_xfer32,
Florian Fainelli3db691d2008-03-06 12:25:21 +010075};
76
77/* ------------------------------------------------------------------------ */
78
Ralf Baechle3dd654b2008-04-28 12:41:36 +010079static struct scsi_host_template rb532_pata_sht = {
Tejun Heo68d1d072008-03-25 12:22:49 +090080 ATA_PIO_SHT(DRV_NAME),
Florian Fainelli3db691d2008-03-06 12:25:21 +010081};
82
83/* ------------------------------------------------------------------------ */
84
Ralf Baechle3dd654b2008-04-28 12:41:36 +010085static void rb532_pata_setup_ports(struct ata_host *ah)
Florian Fainelli3db691d2008-03-06 12:25:21 +010086{
Ralf Baechle3dd654b2008-04-28 12:41:36 +010087 struct rb532_cf_info *info = ah->private_data;
Florian Fainelli3db691d2008-03-06 12:25:21 +010088 struct ata_port *ap;
89
90 ap = ah->ports[0];
91
Ralf Baechle3dd654b2008-04-28 12:41:36 +010092 ap->ops = &rb532_pata_port_ops;
Erik Inge Bolsø14bdef92009-03-14 21:38:24 +010093 ap->pio_mask = ATA_PIO4;
Florian Fainelli3db691d2008-03-06 12:25:21 +010094
Phil Sutter9f147862008-11-28 20:48:26 +010095 ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE;
Florian Fainelli3db691d2008-03-06 12:25:21 +010096 ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL;
97 ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
98
Tejun Heo9363c382008-04-07 22:47:16 +090099 ata_sff_std_ports(&ap->ioaddr);
Florian Fainelli3db691d2008-03-06 12:25:21 +0100100
Phil Sutter9f147862008-11-28 20:48:26 +0100101 ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32;
102 ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR;
Florian Fainelli3db691d2008-03-06 12:25:21 +0100103}
104
Greg Kroah-Hartman0ec24912012-12-21 13:19:58 -0800105static int rb532_pata_driver_probe(struct platform_device *pdev)
Florian Fainelli3db691d2008-03-06 12:25:21 +0100106{
Florian Fainelli9223d012009-03-13 15:41:43 +0100107 int irq;
Florian Fainelli3db691d2008-03-06 12:25:21 +0100108 int gpio;
109 struct resource *res;
110 struct ata_host *ah;
Ralf Baechle3dd654b2008-04-28 12:41:36 +0100111 struct rb532_cf_info *info;
Florian Fainelli3db691d2008-03-06 12:25:21 +0100112 int ret;
113
114 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
115 if (!res) {
116 dev_err(&pdev->dev, "no IOMEM resource found\n");
117 return -EINVAL;
118 }
119
120 irq = platform_get_irq(pdev, 0);
121 if (irq <= 0) {
122 dev_err(&pdev->dev, "no IRQ resource found\n");
123 return -ENOENT;
124 }
125
126 gpio = irq_to_gpio(irq);
127 if (gpio < 0) {
128 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
129 return -ENOENT;
130 }
131
132 ret = gpio_request(gpio, DRV_NAME);
133 if (ret) {
134 dev_err(&pdev->dev, "GPIO request failed\n");
135 return ret;
136 }
137
138 /* allocate host */
139 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
140 if (!ah)
141 return -ENOMEM;
142
143 platform_set_drvdata(pdev, ah);
144
145 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
146 if (!info)
147 return -ENOMEM;
148
149 ah->private_data = info;
150 info->gpio_line = gpio;
151 info->irq = irq;
152
153 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
Julia Lawall041b5ea2009-08-06 16:05:08 -0700154 resource_size(res));
Florian Fainelli3db691d2008-03-06 12:25:21 +0100155 if (!info->iobase)
156 return -ENOMEM;
157
158 ret = gpio_direction_input(gpio);
159 if (ret) {
160 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
161 ret);
162 goto err_free_gpio;
163 }
164
Ralf Baechle3dd654b2008-04-28 12:41:36 +0100165 rb532_pata_setup_ports(ah);
Florian Fainelli3db691d2008-03-06 12:25:21 +0100166
Ralf Baechle3dd654b2008-04-28 12:41:36 +0100167 ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
168 IRQF_TRIGGER_LOW, &rb532_pata_sht);
Florian Fainelli3db691d2008-03-06 12:25:21 +0100169 if (ret)
170 goto err_free_gpio;
171
172 return 0;
173
174err_free_gpio:
175 gpio_free(gpio);
176
177 return ret;
178}
179
Greg Kroah-Hartman0ec24912012-12-21 13:19:58 -0800180static int rb532_pata_driver_remove(struct platform_device *pdev)
Florian Fainelli3db691d2008-03-06 12:25:21 +0100181{
182 struct ata_host *ah = platform_get_drvdata(pdev);
Ralf Baechle3dd654b2008-04-28 12:41:36 +0100183 struct rb532_cf_info *info = ah->private_data;
Florian Fainelli3db691d2008-03-06 12:25:21 +0100184
185 ata_host_detach(ah);
186 gpio_free(info->gpio_line);
187
188 return 0;
189}
190
Ralf Baechle3dd654b2008-04-28 12:41:36 +0100191static struct platform_driver rb532_pata_platform_driver = {
192 .probe = rb532_pata_driver_probe,
Greg Kroah-Hartman0ec24912012-12-21 13:19:58 -0800193 .remove = rb532_pata_driver_remove,
Florian Fainelli3db691d2008-03-06 12:25:21 +0100194 .driver = {
195 .name = DRV_NAME,
Florian Fainelli3db691d2008-03-06 12:25:21 +0100196 },
197};
198
Florian Fainelli3db691d2008-03-06 12:25:21 +0100199#define DRV_INFO DRV_DESC " version " DRV_VERSION
200
Axel Lin99c8ea32011-11-27 14:44:26 +0800201module_platform_driver(rb532_pata_platform_driver);
Florian Fainelli3db691d2008-03-06 12:25:21 +0100202
203MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
204MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
205MODULE_DESCRIPTION(DRV_DESC);
206MODULE_VERSION(DRV_VERSION);
207MODULE_LICENSE("GPL");
Axel Lin99c8ea32011-11-27 14:44:26 +0800208MODULE_ALIAS("platform:" DRV_NAME);