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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/consumer.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 struct gpio_desc *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 (gpiod_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 struct gpio_desc *gpiod;
110 struct resource *res;
111 struct ata_host *ah;
112 struct rb532_cf_info *info;
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 gpiod = devm_gpiod_get(&pdev->dev, NULL, GPIOD_IN);
128 if (IS_ERR(gpiod)) {
129 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
130 return PTR_ERR(gpiod);
131 }
132 gpiod_set_consumer_name(gpiod, DRV_NAME);
133
134 /* allocate host */
135 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
136 if (!ah)
137 return -ENOMEM;
138
139 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
140 if (!info)
141 return -ENOMEM;
142
143 ah->private_data = info;
144 info->gpio_line = gpiod;
145 info->irq = irq;
146
147 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
148 resource_size(res));
149 if (!info->iobase)
150 return -ENOMEM;
151
152 rb532_pata_setup_ports(ah);
153
154 ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
155 IRQF_TRIGGER_LOW, &rb532_pata_sht);
156 if (ret)
157 return ret;
158
159 return 0;
160}
161
162static int rb532_pata_driver_remove(struct platform_device *pdev)
163{
164 struct ata_host *ah = platform_get_drvdata(pdev);
165 struct rb532_cf_info *info = ah->private_data;
166
167 ata_host_detach(ah);
168
169 return 0;
170}
171
172static struct platform_driver rb532_pata_platform_driver = {
173 .probe = rb532_pata_driver_probe,
174 .remove = rb532_pata_driver_remove,
175 .driver = {
176 .name = DRV_NAME,
177 },
178};
179
180#define DRV_INFO DRV_DESC " version " DRV_VERSION
181
182module_platform_driver(rb532_pata_platform_driver);
183
184MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
185MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
186MODULE_DESCRIPTION(DRV_DESC);
187MODULE_VERSION(DRV_VERSION);
188MODULE_LICENSE("GPL");
189MODULE_ALIAS("platform:" DRV_NAME);
190

Warning: That file was not part of the compilation database. It may have many parsing errors.