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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 | ||
3dd654bf | 35 | #define DRV_NAME "pata-rb532-cf" |
3db691da FF |
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 | ||
9f14786e PS |
42 | #define RB500_CF_REG_BASE 0x0800 |
43 | #define RB500_CF_REG_ERR 0x080D | |
3db691da | 44 | #define RB500_CF_REG_CTRL 0x080E |
9f14786e PS |
45 | /* 32bit buffered data register offset */ |
46 | #define RB500_CF_REG_DBUF32 0x0C00 | |
3db691da | 47 | |
3dd654bf | 48 | struct rb532_cf_info { |
3db691da FF |
49 | void __iomem *iobase; |
50 | unsigned int gpio_line; | |
51 | int frozen; | |
52 | unsigned int irq; | |
53 | }; | |
54 | ||
55 | /* ------------------------------------------------------------------------ */ | |
56 | ||
3dd654bf | 57 | static inline void rb532_pata_finish_io(struct ata_port *ap) |
3db691da FF |
58 | { |
59 | struct ata_host *ah = ap->host; | |
3dd654bf | 60 | struct rb532_cf_info *info = ah->private_data; |
3db691da | 61 | |
a57c1bad AC |
62 | /* FIXME: Keep previous delay. If this is merely a fence then |
63 | ata_sff_sync might be sufficient. */ | |
64 | ata_sff_dma_pause(ap); | |
3db691da | 65 | ndelay(RB500_CF_IO_DELAY); |
3db691da FF |
66 | } |
67 | ||
3dd654bf | 68 | static void rb532_pata_exec_command(struct ata_port *ap, |
3db691da FF |
69 | const struct ata_taskfile *tf) |
70 | { | |
71 | writeb(tf->command, ap->ioaddr.command_addr); | |
3dd654bf | 72 | rb532_pata_finish_io(ap); |
3db691da FF |
73 | } |
74 | ||
03f60840 | 75 | static unsigned int rb532_pata_data_xfer(struct ata_device *adev, unsigned char *buf, |
3db691da FF |
76 | unsigned int buflen, int write_data) |
77 | { | |
78 | struct ata_port *ap = adev->link->ap; | |
79 | void __iomem *ioaddr = ap->ioaddr.data_addr; | |
03f60840 | 80 | int retlen = buflen; |
3db691da FF |
81 | |
82 | if (write_data) { | |
83 | for (; buflen > 0; buflen--, buf++) | |
84 | writeb(*buf, ioaddr); | |
85 | } else { | |
86 | for (; buflen > 0; buflen--, buf++) | |
87 | *buf = readb(ioaddr); | |
88 | } | |
89 | ||
3dd654bf | 90 | rb532_pata_finish_io(adev->link->ap); |
03f60840 | 91 | return retlen; |
3db691da FF |
92 | } |
93 | ||
3dd654bf | 94 | static void rb532_pata_freeze(struct ata_port *ap) |
3db691da | 95 | { |
3dd654bf | 96 | struct rb532_cf_info *info = ap->host->private_data; |
3db691da FF |
97 | |
98 | info->frozen = 1; | |
99 | } | |
100 | ||
3dd654bf | 101 | static void rb532_pata_thaw(struct ata_port *ap) |
3db691da | 102 | { |
3dd654bf | 103 | struct rb532_cf_info *info = ap->host->private_data; |
3db691da FF |
104 | |
105 | info->frozen = 0; | |
106 | } | |
107 | ||
3dd654bf | 108 | static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance) |
3db691da FF |
109 | { |
110 | struct ata_host *ah = dev_instance; | |
3dd654bf | 111 | struct rb532_cf_info *info = ah->private_data; |
3db691da FF |
112 | |
113 | if (gpio_get_value(info->gpio_line)) { | |
114 | set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW); | |
115 | if (!info->frozen) | |
9363c382 | 116 | ata_sff_interrupt(info->irq, dev_instance); |
3db691da FF |
117 | } else { |
118 | set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH); | |
119 | } | |
120 | ||
121 | return IRQ_HANDLED; | |
122 | } | |
123 | ||
3dd654bf | 124 | static struct ata_port_operations rb532_pata_port_ops = { |
029cfd6b | 125 | .inherits = &ata_sff_port_ops, |
3dd654bf RB |
126 | .sff_exec_command = rb532_pata_exec_command, |
127 | .sff_data_xfer = rb532_pata_data_xfer, | |
128 | .freeze = rb532_pata_freeze, | |
129 | .thaw = rb532_pata_thaw, | |
3db691da FF |
130 | }; |
131 | ||
132 | /* ------------------------------------------------------------------------ */ | |
133 | ||
3dd654bf | 134 | static struct scsi_host_template rb532_pata_sht = { |
68d1d07b | 135 | ATA_PIO_SHT(DRV_NAME), |
3db691da FF |
136 | }; |
137 | ||
138 | /* ------------------------------------------------------------------------ */ | |
139 | ||
3dd654bf | 140 | static void rb532_pata_setup_ports(struct ata_host *ah) |
3db691da | 141 | { |
3dd654bf | 142 | struct rb532_cf_info *info = ah->private_data; |
3db691da FF |
143 | struct ata_port *ap; |
144 | ||
145 | ap = ah->ports[0]; | |
146 | ||
3dd654bf | 147 | ap->ops = &rb532_pata_port_ops; |
3db691da FF |
148 | ap->pio_mask = 0x1f; /* PIO4 */ |
149 | ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO; | |
150 | ||
9f14786e | 151 | ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE; |
3db691da FF |
152 | ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL; |
153 | ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL; | |
154 | ||
9363c382 | 155 | ata_sff_std_ports(&ap->ioaddr); |
3db691da | 156 | |
9f14786e PS |
157 | ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32; |
158 | ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR; | |
3db691da FF |
159 | } |
160 | ||
3dd654bf | 161 | static __devinit int rb532_pata_driver_probe(struct platform_device *pdev) |
3db691da FF |
162 | { |
163 | unsigned int irq; | |
164 | int gpio; | |
165 | struct resource *res; | |
166 | struct ata_host *ah; | |
3dd654bf | 167 | struct rb532_cf_info *info; |
3db691da FF |
168 | int ret; |
169 | ||
170 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
171 | if (!res) { | |
172 | dev_err(&pdev->dev, "no IOMEM resource found\n"); | |
173 | return -EINVAL; | |
174 | } | |
175 | ||
176 | irq = platform_get_irq(pdev, 0); | |
177 | if (irq <= 0) { | |
178 | dev_err(&pdev->dev, "no IRQ resource found\n"); | |
179 | return -ENOENT; | |
180 | } | |
181 | ||
182 | gpio = irq_to_gpio(irq); | |
183 | if (gpio < 0) { | |
184 | dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq); | |
185 | return -ENOENT; | |
186 | } | |
187 | ||
188 | ret = gpio_request(gpio, DRV_NAME); | |
189 | if (ret) { | |
190 | dev_err(&pdev->dev, "GPIO request failed\n"); | |
191 | return ret; | |
192 | } | |
193 | ||
194 | /* allocate host */ | |
195 | ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS); | |
196 | if (!ah) | |
197 | return -ENOMEM; | |
198 | ||
199 | platform_set_drvdata(pdev, ah); | |
200 | ||
201 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
202 | if (!info) | |
203 | return -ENOMEM; | |
204 | ||
205 | ah->private_data = info; | |
206 | info->gpio_line = gpio; | |
207 | info->irq = irq; | |
208 | ||
209 | info->iobase = devm_ioremap_nocache(&pdev->dev, res->start, | |
210 | res->end - res->start + 1); | |
211 | if (!info->iobase) | |
212 | return -ENOMEM; | |
213 | ||
214 | ret = gpio_direction_input(gpio); | |
215 | if (ret) { | |
216 | dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n", | |
217 | ret); | |
218 | goto err_free_gpio; | |
219 | } | |
220 | ||
3dd654bf | 221 | rb532_pata_setup_ports(ah); |
3db691da | 222 | |
3dd654bf RB |
223 | ret = ata_host_activate(ah, irq, rb532_pata_irq_handler, |
224 | IRQF_TRIGGER_LOW, &rb532_pata_sht); | |
3db691da FF |
225 | if (ret) |
226 | goto err_free_gpio; | |
227 | ||
228 | return 0; | |
229 | ||
230 | err_free_gpio: | |
231 | gpio_free(gpio); | |
232 | ||
233 | return ret; | |
234 | } | |
235 | ||
3dd654bf | 236 | static __devexit int rb532_pata_driver_remove(struct platform_device *pdev) |
3db691da FF |
237 | { |
238 | struct ata_host *ah = platform_get_drvdata(pdev); | |
3dd654bf | 239 | struct rb532_cf_info *info = ah->private_data; |
3db691da FF |
240 | |
241 | ata_host_detach(ah); | |
242 | gpio_free(info->gpio_line); | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
458622fc KS |
247 | /* work with hotplug and coldplug */ |
248 | MODULE_ALIAS("platform:" DRV_NAME); | |
249 | ||
3dd654bf RB |
250 | static struct platform_driver rb532_pata_platform_driver = { |
251 | .probe = rb532_pata_driver_probe, | |
252 | .remove = __devexit_p(rb532_pata_driver_remove), | |
3db691da FF |
253 | .driver = { |
254 | .name = DRV_NAME, | |
255 | .owner = THIS_MODULE, | |
256 | }, | |
257 | }; | |
258 | ||
259 | /* ------------------------------------------------------------------------ */ | |
260 | ||
261 | #define DRV_INFO DRV_DESC " version " DRV_VERSION | |
262 | ||
3dd654bf | 263 | static int __init rb532_pata_module_init(void) |
3db691da FF |
264 | { |
265 | printk(KERN_INFO DRV_INFO "\n"); | |
266 | ||
3dd654bf | 267 | return platform_driver_register(&rb532_pata_platform_driver); |
3db691da FF |
268 | } |
269 | ||
3dd654bf | 270 | static void __exit rb532_pata_module_exit(void) |
3db691da | 271 | { |
3dd654bf | 272 | platform_driver_unregister(&rb532_pata_platform_driver); |
3db691da FF |
273 | } |
274 | ||
275 | MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); | |
276 | MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); | |
277 | MODULE_DESCRIPTION(DRV_DESC); | |
278 | MODULE_VERSION(DRV_VERSION); | |
279 | MODULE_LICENSE("GPL"); | |
280 | ||
3dd654bf RB |
281 | module_init(rb532_pata_module_init); |
282 | module_exit(rb532_pata_module_exit); |