OpenWrt – Blame information for rev 1

Subversion Repositories:
Rev:
Rev Author Line No. Line
1 office 1 /*
2 * A low-level PATA driver to handle a Compact Flash connected on the
3 * Mikrotik's RouterBoard 153 board.
4 *
5 * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
6 *
7 * This file was based on: drivers/ata/pata_ixp4xx_cf.c
8 * Copyright (C) 2006-07 Tower Technologies
9 * Author: Alessandro Zummo <a.zummo@towertech.it>
10 *
11 * Also was based on the driver for Linux 2.4.xx published by Mikrotik for
12 * their RouterBoard 1xx and 5xx series devices. The original Mikrotik code
13 * seems not to have a license.
14 *
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms of the GNU General Public License version 2 as published
17 * by the Free Software Foundation.
18 *
19 */
20  
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/io.h>
24 #include <linux/interrupt.h>
25 #include <linux/irq.h>
26 #include <linux/gpio.h>
27 #include <linux/platform_device.h>
28  
29 #include <linux/libata.h>
30 #include <scsi/scsi_host.h>
31  
32 #define DRV_NAME "pata-rb153-cf"
33 #define DRV_VERSION "0.5.0"
34 #define DRV_DESC "PATA driver for RouterBOARD 153 Compact Flash"
35  
36 #define RB153_CF_MAXPORTS 1
37 #define RB153_CF_IO_DELAY 100
38  
39 #define RB153_CF_REG_CMD 0x0800
40 #define RB153_CF_REG_CTRL 0x080E
41 #define RB153_CF_REG_DATA 0x0C00
42  
43 struct rb153_cf_info {
44 void __iomem *iobase;
45 unsigned int gpio_line;
46 int frozen;
47 unsigned int irq;
48 };
49  
50 static inline void rb153_pata_finish_io(struct ata_port *ap)
51 {
52 struct rb153_cf_info *info = ap->host->private_data;
53  
54 /* FIXME: Keep previous delay. If this is merely a fence then
55 * ata_sff_sync might be sufficient. */
56 ata_sff_dma_pause(ap);
57 ndelay(RB153_CF_IO_DELAY);
58  
59 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
60 }
61  
62 static void rb153_pata_exec_command(struct ata_port *ap,
63 const struct ata_taskfile *tf)
64 {
65 writeb(tf->command, ap->ioaddr.command_addr);
66 rb153_pata_finish_io(ap);
67 }
68  
69 static unsigned int rb153_pata_data_xfer(struct ata_device *adev,
70 unsigned char *buf,
71 unsigned int buflen,
72 int write_data)
73 {
74 void __iomem *ioaddr = adev->link->ap->ioaddr.data_addr;
75 unsigned int t;
76  
77 t = buflen;
78 if (write_data) {
79 for (; t > 0; t--, buf++)
80 writeb(*buf, ioaddr);
81 } else {
82 for (; t > 0; t--, buf++)
83 *buf = readb(ioaddr);
84 }
85  
86 rb153_pata_finish_io(adev->link->ap);
87 return buflen;
88 }
89  
90 static void rb153_pata_freeze(struct ata_port *ap)
91 {
92 struct rb153_cf_info *info = ap->host->private_data;
93  
94 info->frozen = 1;
95 }
96  
97 static void rb153_pata_thaw(struct ata_port *ap)
98 {
99 struct rb153_cf_info *info = ap->host->private_data;
100  
101 info->frozen = 0;
102 }
103  
104 static irqreturn_t rb153_pata_irq_handler(int irq, void *dev_instance)
105 {
106 struct ata_host *ah = dev_instance;
107 struct rb153_cf_info *info = ah->private_data;
108  
109 if (gpio_get_value(info->gpio_line)) {
110 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
111 if (!info->frozen)
112 ata_sff_interrupt(irq, dev_instance);
113 } else {
114 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
115 }
116  
117 return IRQ_HANDLED;
118 }
119  
120 static struct ata_port_operations rb153_pata_port_ops = {
121 .inherits = &ata_sff_port_ops,
122 .sff_exec_command = rb153_pata_exec_command,
123 .sff_data_xfer = rb153_pata_data_xfer,
124 .freeze = rb153_pata_freeze,
125 .thaw = rb153_pata_thaw,
126 };
127  
128 static struct scsi_host_template rb153_pata_sht = {
129 ATA_PIO_SHT(DRV_NAME),
130 };
131  
132 static void rb153_pata_setup_port(struct ata_host *ah)
133 {
134 struct rb153_cf_info *info = ah->private_data;
135 struct ata_port *ap;
136  
137 ap = ah->ports[0];
138  
139 ap->ops = &rb153_pata_port_ops;
140 ap->pio_mask = 0x1f; /* PIO4 */
141  
142 ap->ioaddr.cmd_addr = info->iobase + RB153_CF_REG_CMD;
143 ap->ioaddr.ctl_addr = info->iobase + RB153_CF_REG_CTRL;
144 ap->ioaddr.altstatus_addr = info->iobase + RB153_CF_REG_CTRL;
145  
146 ata_sff_std_ports(&ap->ioaddr);
147  
148 ap->ioaddr.data_addr = info->iobase + RB153_CF_REG_DATA;
149 }
150  
151 static int rb153_pata_driver_probe(struct platform_device *pdev)
152 {
153 unsigned int irq;
154 int gpio;
155 struct resource *res;
156 struct ata_host *ah;
157 struct rb153_cf_info *info;
158 int ret;
159  
160 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
161 if (!res) {
162 dev_err(&pdev->dev, "no IOMEM resource found\n");
163 return -EINVAL;
164 }
165  
166 irq = platform_get_irq(pdev, 0);
167 if (irq <= 0) {
168 dev_err(&pdev->dev, "no IRQ resource found\n");
169 return -ENOENT;
170 }
171  
172 gpio = irq_to_gpio(irq);
173 if (gpio < 0) {
174 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
175 return -ENOENT;
176 }
177  
178 ret = gpio_request(gpio, DRV_NAME);
179 if (ret) {
180 dev_err(&pdev->dev, "GPIO request failed\n");
181 return ret;
182 }
183  
184 ah = ata_host_alloc(&pdev->dev, RB153_CF_MAXPORTS);
185 if (!ah)
186 return -ENOMEM;
187  
188 platform_set_drvdata(pdev, ah);
189  
190 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
191 if (!info)
192 return -ENOMEM;
193  
194 ah->private_data = info;
195 info->gpio_line = gpio;
196 info->irq = irq;
197  
198 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
199 res->end - res->start + 1);
200 if (!info->iobase)
201 return -ENOMEM;
202  
203 ret = gpio_direction_input(gpio);
204 if (ret) {
205 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
206 ret);
207 goto err_free_gpio;
208 }
209  
210 rb153_pata_setup_port(ah);
211  
212 ret = ata_host_activate(ah, irq, rb153_pata_irq_handler,
213 IRQF_TRIGGER_LOW, &rb153_pata_sht);
214 if (ret)
215 goto err_free_gpio;
216  
217 return 0;
218  
219 err_free_gpio:
220 gpio_free(gpio);
221  
222 return ret;
223 }
224  
225 static int rb153_pata_driver_remove(struct platform_device *pdev)
226 {
227 struct ata_host *ah = platform_get_drvdata(pdev);
228 struct rb153_cf_info *info = ah->private_data;
229  
230 ata_host_detach(ah);
231 gpio_free(info->gpio_line);
232  
233 return 0;
234 }
235  
236 static struct platform_driver rb153_pata_platform_driver = {
237 .probe = rb153_pata_driver_probe,
238 .remove = rb153_pata_driver_remove,
239 .driver = {
240 .name = DRV_NAME,
241 .owner = THIS_MODULE,
242 },
243 };
244  
245 /* ------------------------------------------------------------------------ */
246  
247 #define DRV_INFO DRV_DESC " version " DRV_VERSION
248  
249 static int __init rb153_pata_module_init(void)
250 {
251 printk(KERN_INFO DRV_INFO "\n");
252  
253 return platform_driver_register(&rb153_pata_platform_driver);
254 }
255  
256 static void __exit rb153_pata_module_exit(void)
257 {
258 platform_driver_unregister(&rb153_pata_platform_driver);
259 }
260  
261 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
262 MODULE_DESCRIPTION(DRV_DESC);
263 MODULE_VERSION(DRV_VERSION);
264 MODULE_LICENSE("GPL v2");
265  
266 module_init(rb153_pata_module_init);
267 module_exit(rb153_pata_module_exit);