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3db691da FF |
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/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 | ||
46 | struct rb500_cf_info { | |
47 | void __iomem *iobase; | |
48 | unsigned int gpio_line; | |
49 | int frozen; | |
50 | unsigned int irq; | |
51 | }; | |
52 | ||
53 | /* ------------------------------------------------------------------------ */ | |
54 | ||
55 | static 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 | ||
66 | static 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 | ||
73 | static 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 | ||
90 | static 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 | ||
97 | static 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 | ||
104 | static 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 | ||
3db691da FF |
120 | static 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, | |
6bd99b4e | 136 | .post_internal_cmd = ata_bmdma_post_internal_cmd, |
3db691da | 137 | |
358f9a77 | 138 | .irq_clear = ata_noop_irq_clear, |
3db691da | 139 | .irq_on = ata_irq_on, |
3db691da FF |
140 | }; |
141 | ||
142 | /* ------------------------------------------------------------------------ */ | |
143 | ||
144 | static struct scsi_host_template rb500_pata_sht = { | |
68d1d07b | 145 | ATA_PIO_SHT(DRV_NAME), |
3db691da FF |
146 | }; |
147 | ||
148 | /* ------------------------------------------------------------------------ */ | |
149 | ||
150 | static void rb500_pata_setup_ports(struct ata_host *ah) | |
151 | { | |
152 | struct rb500_cf_info *info = ah->private_data; | |
153 | struct ata_port *ap; | |
154 | ||
155 | ap = ah->ports[0]; | |
156 | ||
157 | ap->ops = &rb500_pata_port_ops; | |
158 | ap->pio_mask = 0x1f; /* PIO4 */ | |
159 | ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO; | |
160 | ||
161 | ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_CMD; | |
162 | ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL; | |
163 | ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL; | |
164 | ||
165 | ata_std_ports(&ap->ioaddr); | |
166 | ||
167 | ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DATA; | |
168 | } | |
169 | ||
170 | static __devinit int rb500_pata_driver_probe(struct platform_device *pdev) | |
171 | { | |
172 | unsigned int irq; | |
173 | int gpio; | |
174 | struct resource *res; | |
175 | struct ata_host *ah; | |
176 | struct rb500_cf_info *info; | |
177 | int ret; | |
178 | ||
179 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
180 | if (!res) { | |
181 | dev_err(&pdev->dev, "no IOMEM resource found\n"); | |
182 | return -EINVAL; | |
183 | } | |
184 | ||
185 | irq = platform_get_irq(pdev, 0); | |
186 | if (irq <= 0) { | |
187 | dev_err(&pdev->dev, "no IRQ resource found\n"); | |
188 | return -ENOENT; | |
189 | } | |
190 | ||
191 | gpio = irq_to_gpio(irq); | |
192 | if (gpio < 0) { | |
193 | dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq); | |
194 | return -ENOENT; | |
195 | } | |
196 | ||
197 | ret = gpio_request(gpio, DRV_NAME); | |
198 | if (ret) { | |
199 | dev_err(&pdev->dev, "GPIO request failed\n"); | |
200 | return ret; | |
201 | } | |
202 | ||
203 | /* allocate host */ | |
204 | ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS); | |
205 | if (!ah) | |
206 | return -ENOMEM; | |
207 | ||
208 | platform_set_drvdata(pdev, ah); | |
209 | ||
210 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
211 | if (!info) | |
212 | return -ENOMEM; | |
213 | ||
214 | ah->private_data = info; | |
215 | info->gpio_line = gpio; | |
216 | info->irq = irq; | |
217 | ||
218 | info->iobase = devm_ioremap_nocache(&pdev->dev, res->start, | |
219 | res->end - res->start + 1); | |
220 | if (!info->iobase) | |
221 | return -ENOMEM; | |
222 | ||
223 | ret = gpio_direction_input(gpio); | |
224 | if (ret) { | |
225 | dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n", | |
226 | ret); | |
227 | goto err_free_gpio; | |
228 | } | |
229 | ||
230 | rb500_pata_setup_ports(ah); | |
231 | ||
232 | ret = ata_host_activate(ah, irq, rb500_pata_irq_handler, | |
233 | IRQF_TRIGGER_LOW, &rb500_pata_sht); | |
234 | if (ret) | |
235 | goto err_free_gpio; | |
236 | ||
237 | return 0; | |
238 | ||
239 | err_free_gpio: | |
240 | gpio_free(gpio); | |
241 | ||
242 | return ret; | |
243 | } | |
244 | ||
245 | static __devexit int rb500_pata_driver_remove(struct platform_device *pdev) | |
246 | { | |
247 | struct ata_host *ah = platform_get_drvdata(pdev); | |
248 | struct rb500_cf_info *info = ah->private_data; | |
249 | ||
250 | ata_host_detach(ah); | |
251 | gpio_free(info->gpio_line); | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | static struct platform_driver rb500_pata_platform_driver = { | |
257 | .probe = rb500_pata_driver_probe, | |
258 | .remove = __devexit_p(rb500_pata_driver_remove), | |
259 | .driver = { | |
260 | .name = DRV_NAME, | |
261 | .owner = THIS_MODULE, | |
262 | }, | |
263 | }; | |
264 | ||
265 | /* ------------------------------------------------------------------------ */ | |
266 | ||
267 | #define DRV_INFO DRV_DESC " version " DRV_VERSION | |
268 | ||
269 | static int __init rb500_pata_module_init(void) | |
270 | { | |
271 | printk(KERN_INFO DRV_INFO "\n"); | |
272 | ||
273 | return platform_driver_register(&rb500_pata_platform_driver); | |
274 | } | |
275 | ||
276 | static void __exit rb500_pata_module_exit(void) | |
277 | { | |
278 | platform_driver_unregister(&rb500_pata_platform_driver); | |
279 | } | |
280 | ||
281 | MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); | |
282 | MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); | |
283 | MODULE_DESCRIPTION(DRV_DESC); | |
284 | MODULE_VERSION(DRV_VERSION); | |
285 | MODULE_LICENSE("GPL"); | |
286 | ||
287 | module_init(rb500_pata_module_init); | |
288 | module_exit(rb500_pata_module_exit); |