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
50 struct rb532_cf_info {
51 void __iomem *iobase;
52 unsigned int gpio_line;
53 unsigned int irq;
54 };
55
56 /* ------------------------------------------------------------------------ */
57
rb532_pata_irq_handler(int irq,void * dev_instance)58 static 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
73 static 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
80 static struct scsi_host_template rb532_pata_sht = {
81 ATA_PIO_SHT(DRV_NAME),
82 };
83
84 /* ------------------------------------------------------------------------ */
85
rb532_pata_setup_ports(struct ata_host * ah)86 static 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
rb532_pata_driver_probe(struct platform_device * pdev)106 static 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 irq;
126 }
127 if (!irq)
128 return -EINVAL;
129
130 pdata = dev_get_platdata(&pdev->dev);
131 if (!pdata) {
132 dev_err(&pdev->dev, "no platform data specified\n");
133 return -EINVAL;
134 }
135
136 gpio = pdata->gpio_pin;
137 if (gpio < 0) {
138 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
139 return -ENOENT;
140 }
141
142 ret = gpio_request(gpio, DRV_NAME);
143 if (ret) {
144 dev_err(&pdev->dev, "GPIO request failed\n");
145 return ret;
146 }
147
148 /* allocate host */
149 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
150 if (!ah)
151 return -ENOMEM;
152
153 platform_set_drvdata(pdev, ah);
154
155 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
156 if (!info)
157 return -ENOMEM;
158
159 ah->private_data = info;
160 info->gpio_line = gpio;
161 info->irq = irq;
162
163 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
164 resource_size(res));
165 if (!info->iobase)
166 return -ENOMEM;
167
168 ret = gpio_direction_input(gpio);
169 if (ret) {
170 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
171 ret);
172 goto err_free_gpio;
173 }
174
175 rb532_pata_setup_ports(ah);
176
177 ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
178 IRQF_TRIGGER_LOW, &rb532_pata_sht);
179 if (ret)
180 goto err_free_gpio;
181
182 return 0;
183
184 err_free_gpio:
185 gpio_free(gpio);
186
187 return ret;
188 }
189
rb532_pata_driver_remove(struct platform_device * pdev)190 static int rb532_pata_driver_remove(struct platform_device *pdev)
191 {
192 struct ata_host *ah = platform_get_drvdata(pdev);
193 struct rb532_cf_info *info = ah->private_data;
194
195 ata_host_detach(ah);
196 gpio_free(info->gpio_line);
197
198 return 0;
199 }
200
201 static struct platform_driver rb532_pata_platform_driver = {
202 .probe = rb532_pata_driver_probe,
203 .remove = rb532_pata_driver_remove,
204 .driver = {
205 .name = DRV_NAME,
206 },
207 };
208
209 #define DRV_INFO DRV_DESC " version " DRV_VERSION
210
211 module_platform_driver(rb532_pata_platform_driver);
212
213 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
214 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
215 MODULE_DESCRIPTION(DRV_DESC);
216 MODULE_VERSION(DRV_VERSION);
217 MODULE_LICENSE("GPL");
218 MODULE_ALIAS("platform:" DRV_NAME);
219