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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 | ||
9363c382 | 60 | ata_sff_altstatus(ap); |
3db691da FF |
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) | |
9363c382 | 112 | ata_sff_interrupt(info->irq, dev_instance); |
3db691da FF |
113 | } else { |
114 | set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH); | |
115 | } | |
116 | ||
117 | return IRQ_HANDLED; | |
118 | } | |
119 | ||
3db691da | 120 | static struct ata_port_operations rb500_pata_port_ops = { |
029cfd6b | 121 | .inherits = &ata_sff_port_ops, |
5682ed33 TH |
122 | .sff_exec_command = rb500_pata_exec_command, |
123 | .sff_data_xfer = rb500_pata_data_xfer, | |
3db691da FF |
124 | .freeze = rb500_pata_freeze, |
125 | .thaw = rb500_pata_thaw, | |
3db691da FF |
126 | }; |
127 | ||
128 | /* ------------------------------------------------------------------------ */ | |
129 | ||
130 | static struct scsi_host_template rb500_pata_sht = { | |
68d1d07b | 131 | ATA_PIO_SHT(DRV_NAME), |
3db691da FF |
132 | }; |
133 | ||
134 | /* ------------------------------------------------------------------------ */ | |
135 | ||
136 | static void rb500_pata_setup_ports(struct ata_host *ah) | |
137 | { | |
138 | struct rb500_cf_info *info = ah->private_data; | |
139 | struct ata_port *ap; | |
140 | ||
141 | ap = ah->ports[0]; | |
142 | ||
143 | ap->ops = &rb500_pata_port_ops; | |
144 | ap->pio_mask = 0x1f; /* PIO4 */ | |
145 | ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO; | |
146 | ||
147 | ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_CMD; | |
148 | ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL; | |
149 | ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL; | |
150 | ||
9363c382 | 151 | ata_sff_std_ports(&ap->ioaddr); |
3db691da FF |
152 | |
153 | ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DATA; | |
154 | } | |
155 | ||
156 | static __devinit int rb500_pata_driver_probe(struct platform_device *pdev) | |
157 | { | |
158 | unsigned int irq; | |
159 | int gpio; | |
160 | struct resource *res; | |
161 | struct ata_host *ah; | |
162 | struct rb500_cf_info *info; | |
163 | int ret; | |
164 | ||
165 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
166 | if (!res) { | |
167 | dev_err(&pdev->dev, "no IOMEM resource found\n"); | |
168 | return -EINVAL; | |
169 | } | |
170 | ||
171 | irq = platform_get_irq(pdev, 0); | |
172 | if (irq <= 0) { | |
173 | dev_err(&pdev->dev, "no IRQ resource found\n"); | |
174 | return -ENOENT; | |
175 | } | |
176 | ||
177 | gpio = irq_to_gpio(irq); | |
178 | if (gpio < 0) { | |
179 | dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq); | |
180 | return -ENOENT; | |
181 | } | |
182 | ||
183 | ret = gpio_request(gpio, DRV_NAME); | |
184 | if (ret) { | |
185 | dev_err(&pdev->dev, "GPIO request failed\n"); | |
186 | return ret; | |
187 | } | |
188 | ||
189 | /* allocate host */ | |
190 | ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS); | |
191 | if (!ah) | |
192 | return -ENOMEM; | |
193 | ||
194 | platform_set_drvdata(pdev, ah); | |
195 | ||
196 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
197 | if (!info) | |
198 | return -ENOMEM; | |
199 | ||
200 | ah->private_data = info; | |
201 | info->gpio_line = gpio; | |
202 | info->irq = irq; | |
203 | ||
204 | info->iobase = devm_ioremap_nocache(&pdev->dev, res->start, | |
205 | res->end - res->start + 1); | |
206 | if (!info->iobase) | |
207 | return -ENOMEM; | |
208 | ||
209 | ret = gpio_direction_input(gpio); | |
210 | if (ret) { | |
211 | dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n", | |
212 | ret); | |
213 | goto err_free_gpio; | |
214 | } | |
215 | ||
216 | rb500_pata_setup_ports(ah); | |
217 | ||
218 | ret = ata_host_activate(ah, irq, rb500_pata_irq_handler, | |
219 | IRQF_TRIGGER_LOW, &rb500_pata_sht); | |
220 | if (ret) | |
221 | goto err_free_gpio; | |
222 | ||
223 | return 0; | |
224 | ||
225 | err_free_gpio: | |
226 | gpio_free(gpio); | |
227 | ||
228 | return ret; | |
229 | } | |
230 | ||
231 | static __devexit int rb500_pata_driver_remove(struct platform_device *pdev) | |
232 | { | |
233 | struct ata_host *ah = platform_get_drvdata(pdev); | |
234 | struct rb500_cf_info *info = ah->private_data; | |
235 | ||
236 | ata_host_detach(ah); | |
237 | gpio_free(info->gpio_line); | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
458622fc KS |
242 | /* work with hotplug and coldplug */ |
243 | MODULE_ALIAS("platform:" DRV_NAME); | |
244 | ||
3db691da FF |
245 | static struct platform_driver rb500_pata_platform_driver = { |
246 | .probe = rb500_pata_driver_probe, | |
247 | .remove = __devexit_p(rb500_pata_driver_remove), | |
248 | .driver = { | |
249 | .name = DRV_NAME, | |
250 | .owner = THIS_MODULE, | |
251 | }, | |
252 | }; | |
253 | ||
254 | /* ------------------------------------------------------------------------ */ | |
255 | ||
256 | #define DRV_INFO DRV_DESC " version " DRV_VERSION | |
257 | ||
258 | static int __init rb500_pata_module_init(void) | |
259 | { | |
260 | printk(KERN_INFO DRV_INFO "\n"); | |
261 | ||
262 | return platform_driver_register(&rb500_pata_platform_driver); | |
263 | } | |
264 | ||
265 | static void __exit rb500_pata_module_exit(void) | |
266 | { | |
267 | platform_driver_unregister(&rb500_pata_platform_driver); | |
268 | } | |
269 | ||
270 | MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); | |
271 | MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); | |
272 | MODULE_DESCRIPTION(DRV_DESC); | |
273 | MODULE_VERSION(DRV_VERSION); | |
274 | MODULE_LICENSE("GPL"); | |
275 | ||
276 | module_init(rb500_pata_module_init); | |
277 | module_exit(rb500_pata_module_exit); |