Commit | Line | Data |
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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 | ||
5a0e3ad6 | 22 | #include <linux/gfp.h> |
3db691da FF |
23 | #include <linux/kernel.h> |
24 | #include <linux/module.h> | |
25 | #include <linux/platform_device.h> | |
26 | ||
27 | #include <linux/io.h> | |
28 | #include <linux/interrupt.h> | |
29 | #include <linux/irq.h> | |
832f5dac | 30 | #include <linux/gpio.h> |
3db691da FF |
31 | |
32 | #include <linux/libata.h> | |
33 | #include <scsi/scsi_host.h> | |
34 | ||
01836176 GJ |
35 | #include <asm/mach-rc32434/rb.h> |
36 | ||
3dd654bf | 37 | #define DRV_NAME "pata-rb532-cf" |
3db691da FF |
38 | #define DRV_VERSION "0.1.0" |
39 | #define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash" | |
40 | ||
41 | #define RB500_CF_MAXPORTS 1 | |
42 | #define RB500_CF_IO_DELAY 400 | |
43 | ||
9f14786e PS |
44 | #define RB500_CF_REG_BASE 0x0800 |
45 | #define RB500_CF_REG_ERR 0x080D | |
3db691da | 46 | #define RB500_CF_REG_CTRL 0x080E |
9f14786e PS |
47 | /* 32bit buffered data register offset */ |
48 | #define RB500_CF_REG_DBUF32 0x0C00 | |
3db691da | 49 | |
3dd654bf | 50 | struct rb532_cf_info { |
3db691da FF |
51 | void __iomem *iobase; |
52 | unsigned int gpio_line; | |
3db691da FF |
53 | unsigned int irq; |
54 | }; | |
55 | ||
56 | /* ------------------------------------------------------------------------ */ | |
57 | ||
3dd654bf | 58 | static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance) |
3db691da FF |
59 | { |
60 | struct ata_host *ah = dev_instance; | |
3dd654bf | 61 | struct rb532_cf_info *info = ah->private_data; |
3db691da FF |
62 | |
63 | if (gpio_get_value(info->gpio_line)) { | |
dced35ae | 64 | irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW); |
6be976e7 | 65 | ata_sff_interrupt(info->irq, dev_instance); |
3db691da | 66 | } else { |
dced35ae | 67 | irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH); |
3db691da FF |
68 | } |
69 | ||
70 | return IRQ_HANDLED; | |
71 | } | |
72 | ||
3dd654bf | 73 | static struct ata_port_operations rb532_pata_port_ops = { |
029cfd6b | 74 | .inherits = &ata_sff_port_ops, |
180bd147 | 75 | .sff_data_xfer = ata_sff_data_xfer32, |
3db691da FF |
76 | }; |
77 | ||
78 | /* ------------------------------------------------------------------------ */ | |
79 | ||
3dd654bf | 80 | static struct scsi_host_template rb532_pata_sht = { |
68d1d07b | 81 | ATA_PIO_SHT(DRV_NAME), |
3db691da FF |
82 | }; |
83 | ||
84 | /* ------------------------------------------------------------------------ */ | |
85 | ||
3dd654bf | 86 | static void rb532_pata_setup_ports(struct ata_host *ah) |
3db691da | 87 | { |
3dd654bf | 88 | struct rb532_cf_info *info = ah->private_data; |
3db691da FF |
89 | struct ata_port *ap; |
90 | ||
91 | ap = ah->ports[0]; | |
92 | ||
3dd654bf | 93 | ap->ops = &rb532_pata_port_ops; |
14bdef98 | 94 | ap->pio_mask = ATA_PIO4; |
3db691da | 95 | |
9f14786e | 96 | ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE; |
3db691da FF |
97 | ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL; |
98 | ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL; | |
99 | ||
9363c382 | 100 | ata_sff_std_ports(&ap->ioaddr); |
3db691da | 101 | |
9f14786e PS |
102 | ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32; |
103 | ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR; | |
3db691da FF |
104 | } |
105 | ||
0ec24914 | 106 | static int rb532_pata_driver_probe(struct platform_device *pdev) |
3db691da | 107 | { |
9223d01b | 108 | int irq; |
3db691da FF |
109 | int gpio; |
110 | struct resource *res; | |
111 | struct ata_host *ah; | |
01836176 | 112 | struct cf_device *pdata; |
3dd654bf | 113 | struct rb532_cf_info *info; |
3db691da FF |
114 | int ret; |
115 | ||
116 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
117 | if (!res) { | |
118 | dev_err(&pdev->dev, "no IOMEM resource found\n"); | |
119 | return -EINVAL; | |
120 | } | |
121 | ||
122 | irq = platform_get_irq(pdev, 0); | |
123 | if (irq <= 0) { | |
124 | dev_err(&pdev->dev, "no IRQ resource found\n"); | |
125 | return -ENOENT; | |
126 | } | |
127 | ||
01836176 GJ |
128 | pdata = dev_get_platdata(&pdev->dev); |
129 | if (!pdata) { | |
130 | dev_err(&pdev->dev, "no platform data specified\n"); | |
131 | return -EINVAL; | |
132 | } | |
133 | ||
134 | gpio = pdata->gpio_pin; | |
3db691da FF |
135 | if (gpio < 0) { |
136 | dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq); | |
137 | return -ENOENT; | |
138 | } | |
139 | ||
140 | ret = gpio_request(gpio, DRV_NAME); | |
141 | if (ret) { | |
142 | dev_err(&pdev->dev, "GPIO request failed\n"); | |
143 | return ret; | |
144 | } | |
145 | ||
146 | /* allocate host */ | |
147 | ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS); | |
148 | if (!ah) | |
149 | return -ENOMEM; | |
150 | ||
151 | platform_set_drvdata(pdev, ah); | |
152 | ||
153 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
154 | if (!info) | |
155 | return -ENOMEM; | |
156 | ||
157 | ah->private_data = info; | |
158 | info->gpio_line = gpio; | |
159 | info->irq = irq; | |
160 | ||
161 | info->iobase = devm_ioremap_nocache(&pdev->dev, res->start, | |
041b5eac | 162 | resource_size(res)); |
3db691da FF |
163 | if (!info->iobase) |
164 | return -ENOMEM; | |
165 | ||
166 | ret = gpio_direction_input(gpio); | |
167 | if (ret) { | |
168 | dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n", | |
169 | ret); | |
170 | goto err_free_gpio; | |
171 | } | |
172 | ||
3dd654bf | 173 | rb532_pata_setup_ports(ah); |
3db691da | 174 | |
3dd654bf RB |
175 | ret = ata_host_activate(ah, irq, rb532_pata_irq_handler, |
176 | IRQF_TRIGGER_LOW, &rb532_pata_sht); | |
3db691da FF |
177 | if (ret) |
178 | goto err_free_gpio; | |
179 | ||
180 | return 0; | |
181 | ||
182 | err_free_gpio: | |
183 | gpio_free(gpio); | |
184 | ||
185 | return ret; | |
186 | } | |
187 | ||
0ec24914 | 188 | static int rb532_pata_driver_remove(struct platform_device *pdev) |
3db691da FF |
189 | { |
190 | struct ata_host *ah = platform_get_drvdata(pdev); | |
3dd654bf | 191 | struct rb532_cf_info *info = ah->private_data; |
3db691da FF |
192 | |
193 | ata_host_detach(ah); | |
194 | gpio_free(info->gpio_line); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
3dd654bf RB |
199 | static struct platform_driver rb532_pata_platform_driver = { |
200 | .probe = rb532_pata_driver_probe, | |
0ec24914 | 201 | .remove = rb532_pata_driver_remove, |
3db691da FF |
202 | .driver = { |
203 | .name = DRV_NAME, | |
3db691da FF |
204 | }, |
205 | }; | |
206 | ||
3db691da FF |
207 | #define DRV_INFO DRV_DESC " version " DRV_VERSION |
208 | ||
99c8ea3e | 209 | module_platform_driver(rb532_pata_platform_driver); |
3db691da FF |
210 | |
211 | MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); | |
212 | MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); | |
213 | MODULE_DESCRIPTION(DRV_DESC); | |
214 | MODULE_VERSION(DRV_VERSION); | |
215 | MODULE_LICENSE("GPL"); | |
99c8ea3e | 216 | MODULE_ALIAS("platform:" DRV_NAME); |