blob: 22cb9e1a02f5031795e0c842f9e2a1fac64affb2 [file] [log] [blame]
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
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/platform_device.h>
25
26#include <linux/io.h>
27#include <linux/interrupt.h>
28#include <linux/irq.h>
29
30#include <linux/libata.h>
31#include <scsi/scsi_host.h>
32
33#include <asm/gpio.h>
34
35#define DRV_NAME "pata-rb500-cf"
36#define DRV_VERSION "0.1.0"
37#define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash"
38
39#define RB500_CF_MAXPORTS 1
40#define RB500_CF_IO_DELAY 400
41
42#define RB500_CF_REG_CMD 0x0800
43#define RB500_CF_REG_CTRL 0x080E
44#define RB500_CF_REG_DATA 0x0C00
45
46struct rb500_cf_info {
47 void __iomem *iobase;
48 unsigned int gpio_line;
49 int frozen;
50 unsigned int irq;
51};
52
53/* ------------------------------------------------------------------------ */
54
55static inline void rb500_pata_finish_io(struct ata_port *ap)
56{
57 struct ata_host *ah = ap->host;
58 struct rb500_cf_info *info = ah->private_data;
59
60 ata_altstatus(ap);
61 ndelay(RB500_CF_IO_DELAY);
62
63 set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
64}
65
66static void rb500_pata_exec_command(struct ata_port *ap,
67 const struct ata_taskfile *tf)
68{
69 writeb(tf->command, ap->ioaddr.command_addr);
70 rb500_pata_finish_io(ap);
71}
72
73static void rb500_pata_data_xfer(struct ata_device *adev, unsigned char *buf,
74 unsigned int buflen, int write_data)
75{
76 struct ata_port *ap = adev->link->ap;
77 void __iomem *ioaddr = ap->ioaddr.data_addr;
78
79 if (write_data) {
80 for (; buflen > 0; buflen--, buf++)
81 writeb(*buf, ioaddr);
82 } else {
83 for (; buflen > 0; buflen--, buf++)
84 *buf = readb(ioaddr);
85 }
86
87 rb500_pata_finish_io(adev->link->ap);
88}
89
90static void rb500_pata_freeze(struct ata_port *ap)
91{
92 struct rb500_cf_info *info = ap->host->private_data;
93
94 info->frozen = 1;
95}
96
97static void rb500_pata_thaw(struct ata_port *ap)
98{
99 struct rb500_cf_info *info = ap->host->private_data;
100
101 info->frozen = 0;
102}
103
104static irqreturn_t rb500_pata_irq_handler(int irq, void *dev_instance)
105{
106 struct ata_host *ah = dev_instance;
107 struct rb500_cf_info *info = ah->private_data;
108
109 if (gpio_get_value(info->gpio_line)) {
110 set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
111 if (!info->frozen)
112 ata_interrupt(info->irq, dev_instance);
113 } else {
114 set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
115 }
116
117 return IRQ_HANDLED;
118}
119
Florian Fainelli3db691d2008-03-06 12:25:21 +0100120static struct ata_port_operations rb500_pata_port_ops = {
121 .tf_load = ata_tf_load,
122 .tf_read = ata_tf_read,
123
124 .exec_command = rb500_pata_exec_command,
125 .check_status = ata_check_status,
126 .dev_select = ata_std_dev_select,
127
128 .data_xfer = rb500_pata_data_xfer,
129
130 .qc_prep = ata_qc_prep,
131 .qc_issue = ata_qc_issue_prot,
132
133 .freeze = rb500_pata_freeze,
134 .thaw = rb500_pata_thaw,
135 .error_handler = ata_bmdma_error_handler,
Tejun Heo6bd99b42008-03-25 12:22:48 +0900136 .post_internal_cmd = ata_bmdma_post_internal_cmd,
Florian Fainelli3db691d2008-03-06 12:25:21 +0100137
Tejun Heo358f9a72008-03-25 12:22:47 +0900138 .irq_clear = ata_noop_irq_clear,
Florian Fainelli3db691d2008-03-06 12:25:21 +0100139 .irq_on = ata_irq_on,
Florian Fainelli3db691d2008-03-06 12:25:21 +0100140};
141
142/* ------------------------------------------------------------------------ */
143
144static struct scsi_host_template rb500_pata_sht = {
145 .module = THIS_MODULE,
146 .name = DRV_NAME,
147 .ioctl = ata_scsi_ioctl,
148 .queuecommand = ata_scsi_queuecmd,
149 .slave_configure = ata_scsi_slave_config,
150 .slave_destroy = ata_scsi_slave_destroy,
151 .bios_param = ata_std_bios_param,
152 .proc_name = DRV_NAME,
153
154 .can_queue = ATA_DEF_QUEUE,
155 .this_id = ATA_SHT_THIS_ID,
156 .sg_tablesize = LIBATA_MAX_PRD,
157 .dma_boundary = ATA_DMA_BOUNDARY,
158 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
159 .emulated = ATA_SHT_EMULATED,
160 .use_clustering = ATA_SHT_USE_CLUSTERING,
161};
162
163/* ------------------------------------------------------------------------ */
164
165static void rb500_pata_setup_ports(struct ata_host *ah)
166{
167 struct rb500_cf_info *info = ah->private_data;
168 struct ata_port *ap;
169
170 ap = ah->ports[0];
171
172 ap->ops = &rb500_pata_port_ops;
173 ap->pio_mask = 0x1f; /* PIO4 */
174 ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;
175
176 ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_CMD;
177 ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL;
178 ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
179
180 ata_std_ports(&ap->ioaddr);
181
182 ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DATA;
183}
184
185static __devinit int rb500_pata_driver_probe(struct platform_device *pdev)
186{
187 unsigned int irq;
188 int gpio;
189 struct resource *res;
190 struct ata_host *ah;
191 struct rb500_cf_info *info;
192 int ret;
193
194 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
195 if (!res) {
196 dev_err(&pdev->dev, "no IOMEM resource found\n");
197 return -EINVAL;
198 }
199
200 irq = platform_get_irq(pdev, 0);
201 if (irq <= 0) {
202 dev_err(&pdev->dev, "no IRQ resource found\n");
203 return -ENOENT;
204 }
205
206 gpio = irq_to_gpio(irq);
207 if (gpio < 0) {
208 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
209 return -ENOENT;
210 }
211
212 ret = gpio_request(gpio, DRV_NAME);
213 if (ret) {
214 dev_err(&pdev->dev, "GPIO request failed\n");
215 return ret;
216 }
217
218 /* allocate host */
219 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
220 if (!ah)
221 return -ENOMEM;
222
223 platform_set_drvdata(pdev, ah);
224
225 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
226 if (!info)
227 return -ENOMEM;
228
229 ah->private_data = info;
230 info->gpio_line = gpio;
231 info->irq = irq;
232
233 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
234 res->end - res->start + 1);
235 if (!info->iobase)
236 return -ENOMEM;
237
238 ret = gpio_direction_input(gpio);
239 if (ret) {
240 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
241 ret);
242 goto err_free_gpio;
243 }
244
245 rb500_pata_setup_ports(ah);
246
247 ret = ata_host_activate(ah, irq, rb500_pata_irq_handler,
248 IRQF_TRIGGER_LOW, &rb500_pata_sht);
249 if (ret)
250 goto err_free_gpio;
251
252 return 0;
253
254err_free_gpio:
255 gpio_free(gpio);
256
257 return ret;
258}
259
260static __devexit int rb500_pata_driver_remove(struct platform_device *pdev)
261{
262 struct ata_host *ah = platform_get_drvdata(pdev);
263 struct rb500_cf_info *info = ah->private_data;
264
265 ata_host_detach(ah);
266 gpio_free(info->gpio_line);
267
268 return 0;
269}
270
271static struct platform_driver rb500_pata_platform_driver = {
272 .probe = rb500_pata_driver_probe,
273 .remove = __devexit_p(rb500_pata_driver_remove),
274 .driver = {
275 .name = DRV_NAME,
276 .owner = THIS_MODULE,
277 },
278};
279
280/* ------------------------------------------------------------------------ */
281
282#define DRV_INFO DRV_DESC " version " DRV_VERSION
283
284static int __init rb500_pata_module_init(void)
285{
286 printk(KERN_INFO DRV_INFO "\n");
287
288 return platform_driver_register(&rb500_pata_platform_driver);
289}
290
291static void __exit rb500_pata_module_exit(void)
292{
293 platform_driver_unregister(&rb500_pata_platform_driver);
294}
295
296MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
297MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
298MODULE_DESCRIPTION(DRV_DESC);
299MODULE_VERSION(DRV_VERSION);
300MODULE_LICENSE("GPL");
301
302module_init(rb500_pata_module_init);
303module_exit(rb500_pata_module_exit);