blob: 4ce9b03fe6c845dc349cbe58144cad7f63ee362d [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
120static void rb500_pata_irq_clear(struct ata_port *ap)
121{
122}
123
124static int rb500_pata_port_start(struct ata_port *ap)
125{
126 return 0;
127}
128
129static struct ata_port_operations rb500_pata_port_ops = {
130 .tf_load = ata_tf_load,
131 .tf_read = ata_tf_read,
132
133 .exec_command = rb500_pata_exec_command,
134 .check_status = ata_check_status,
135 .dev_select = ata_std_dev_select,
136
137 .data_xfer = rb500_pata_data_xfer,
138
139 .qc_prep = ata_qc_prep,
140 .qc_issue = ata_qc_issue_prot,
141
142 .freeze = rb500_pata_freeze,
143 .thaw = rb500_pata_thaw,
144 .error_handler = ata_bmdma_error_handler,
145
146 .irq_handler = rb500_pata_irq_handler,
147 .irq_clear = rb500_pata_irq_clear,
148 .irq_on = ata_irq_on,
149
150 .port_start = rb500_pata_port_start,
151};
152
153/* ------------------------------------------------------------------------ */
154
155static struct scsi_host_template rb500_pata_sht = {
156 .module = THIS_MODULE,
157 .name = DRV_NAME,
158 .ioctl = ata_scsi_ioctl,
159 .queuecommand = ata_scsi_queuecmd,
160 .slave_configure = ata_scsi_slave_config,
161 .slave_destroy = ata_scsi_slave_destroy,
162 .bios_param = ata_std_bios_param,
163 .proc_name = DRV_NAME,
164
165 .can_queue = ATA_DEF_QUEUE,
166 .this_id = ATA_SHT_THIS_ID,
167 .sg_tablesize = LIBATA_MAX_PRD,
168 .dma_boundary = ATA_DMA_BOUNDARY,
169 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
170 .emulated = ATA_SHT_EMULATED,
171 .use_clustering = ATA_SHT_USE_CLUSTERING,
172};
173
174/* ------------------------------------------------------------------------ */
175
176static void rb500_pata_setup_ports(struct ata_host *ah)
177{
178 struct rb500_cf_info *info = ah->private_data;
179 struct ata_port *ap;
180
181 ap = ah->ports[0];
182
183 ap->ops = &rb500_pata_port_ops;
184 ap->pio_mask = 0x1f; /* PIO4 */
185 ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;
186
187 ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_CMD;
188 ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL;
189 ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
190
191 ata_std_ports(&ap->ioaddr);
192
193 ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DATA;
194}
195
196static __devinit int rb500_pata_driver_probe(struct platform_device *pdev)
197{
198 unsigned int irq;
199 int gpio;
200 struct resource *res;
201 struct ata_host *ah;
202 struct rb500_cf_info *info;
203 int ret;
204
205 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
206 if (!res) {
207 dev_err(&pdev->dev, "no IOMEM resource found\n");
208 return -EINVAL;
209 }
210
211 irq = platform_get_irq(pdev, 0);
212 if (irq <= 0) {
213 dev_err(&pdev->dev, "no IRQ resource found\n");
214 return -ENOENT;
215 }
216
217 gpio = irq_to_gpio(irq);
218 if (gpio < 0) {
219 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
220 return -ENOENT;
221 }
222
223 ret = gpio_request(gpio, DRV_NAME);
224 if (ret) {
225 dev_err(&pdev->dev, "GPIO request failed\n");
226 return ret;
227 }
228
229 /* allocate host */
230 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
231 if (!ah)
232 return -ENOMEM;
233
234 platform_set_drvdata(pdev, ah);
235
236 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
237 if (!info)
238 return -ENOMEM;
239
240 ah->private_data = info;
241 info->gpio_line = gpio;
242 info->irq = irq;
243
244 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
245 res->end - res->start + 1);
246 if (!info->iobase)
247 return -ENOMEM;
248
249 ret = gpio_direction_input(gpio);
250 if (ret) {
251 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
252 ret);
253 goto err_free_gpio;
254 }
255
256 rb500_pata_setup_ports(ah);
257
258 ret = ata_host_activate(ah, irq, rb500_pata_irq_handler,
259 IRQF_TRIGGER_LOW, &rb500_pata_sht);
260 if (ret)
261 goto err_free_gpio;
262
263 return 0;
264
265err_free_gpio:
266 gpio_free(gpio);
267
268 return ret;
269}
270
271static __devexit int rb500_pata_driver_remove(struct platform_device *pdev)
272{
273 struct ata_host *ah = platform_get_drvdata(pdev);
274 struct rb500_cf_info *info = ah->private_data;
275
276 ata_host_detach(ah);
277 gpio_free(info->gpio_line);
278
279 return 0;
280}
281
282static struct platform_driver rb500_pata_platform_driver = {
283 .probe = rb500_pata_driver_probe,
284 .remove = __devexit_p(rb500_pata_driver_remove),
285 .driver = {
286 .name = DRV_NAME,
287 .owner = THIS_MODULE,
288 },
289};
290
291/* ------------------------------------------------------------------------ */
292
293#define DRV_INFO DRV_DESC " version " DRV_VERSION
294
295static int __init rb500_pata_module_init(void)
296{
297 printk(KERN_INFO DRV_INFO "\n");
298
299 return platform_driver_register(&rb500_pata_platform_driver);
300}
301
302static void __exit rb500_pata_module_exit(void)
303{
304 platform_driver_unregister(&rb500_pata_platform_driver);
305}
306
307MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
308MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
309MODULE_DESCRIPTION(DRV_DESC);
310MODULE_VERSION(DRV_VERSION);
311MODULE_LICENSE("GPL");
312
313module_init(rb500_pata_module_init);
314module_exit(rb500_pata_module_exit);