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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> | |
30 | ||
31 | #include <linux/libata.h> | |
32 | #include <scsi/scsi_host.h> | |
33 | ||
34 | #include <asm/gpio.h> | |
35 | ||
3dd654bf | 36 | #define DRV_NAME "pata-rb532-cf" |
3db691da FF |
37 | #define DRV_VERSION "0.1.0" |
38 | #define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash" | |
39 | ||
40 | #define RB500_CF_MAXPORTS 1 | |
41 | #define RB500_CF_IO_DELAY 400 | |
42 | ||
9f14786e PS |
43 | #define RB500_CF_REG_BASE 0x0800 |
44 | #define RB500_CF_REG_ERR 0x080D | |
3db691da | 45 | #define RB500_CF_REG_CTRL 0x080E |
9f14786e PS |
46 | /* 32bit buffered data register offset */ |
47 | #define RB500_CF_REG_DBUF32 0x0C00 | |
3db691da | 48 | |
3dd654bf | 49 | struct rb532_cf_info { |
3db691da FF |
50 | void __iomem *iobase; |
51 | unsigned int gpio_line; | |
3db691da FF |
52 | unsigned int irq; |
53 | }; | |
54 | ||
55 | /* ------------------------------------------------------------------------ */ | |
56 | ||
3dd654bf | 57 | static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance) |
3db691da FF |
58 | { |
59 | struct ata_host *ah = dev_instance; | |
3dd654bf | 60 | struct rb532_cf_info *info = ah->private_data; |
3db691da FF |
61 | |
62 | if (gpio_get_value(info->gpio_line)) { | |
63 | set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW); | |
6be976e7 | 64 | ata_sff_interrupt(info->irq, dev_instance); |
3db691da FF |
65 | } else { |
66 | set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH); | |
67 | } | |
68 | ||
69 | return IRQ_HANDLED; | |
70 | } | |
71 | ||
3dd654bf | 72 | static struct ata_port_operations rb532_pata_port_ops = { |
029cfd6b | 73 | .inherits = &ata_sff_port_ops, |
180bd147 | 74 | .sff_data_xfer = ata_sff_data_xfer32, |
3db691da FF |
75 | }; |
76 | ||
77 | /* ------------------------------------------------------------------------ */ | |
78 | ||
3dd654bf | 79 | static struct scsi_host_template rb532_pata_sht = { |
68d1d07b | 80 | ATA_PIO_SHT(DRV_NAME), |
3db691da FF |
81 | }; |
82 | ||
83 | /* ------------------------------------------------------------------------ */ | |
84 | ||
3dd654bf | 85 | static void rb532_pata_setup_ports(struct ata_host *ah) |
3db691da | 86 | { |
3dd654bf | 87 | struct rb532_cf_info *info = ah->private_data; |
3db691da FF |
88 | struct ata_port *ap; |
89 | ||
90 | ap = ah->ports[0]; | |
91 | ||
3dd654bf | 92 | ap->ops = &rb532_pata_port_ops; |
14bdef98 | 93 | ap->pio_mask = ATA_PIO4; |
3db691da FF |
94 | ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO; |
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 | ||
3dd654bf | 106 | static __devinit 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; | |
3dd654bf | 112 | struct rb532_cf_info *info; |
3db691da FF |
113 | int ret; |
114 | ||
115 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
116 | if (!res) { | |
117 | dev_err(&pdev->dev, "no IOMEM resource found\n"); | |
118 | return -EINVAL; | |
119 | } | |
120 | ||
121 | irq = platform_get_irq(pdev, 0); | |
122 | if (irq <= 0) { | |
123 | dev_err(&pdev->dev, "no IRQ resource found\n"); | |
124 | return -ENOENT; | |
125 | } | |
126 | ||
127 | gpio = irq_to_gpio(irq); | |
128 | if (gpio < 0) { | |
129 | dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq); | |
130 | return -ENOENT; | |
131 | } | |
132 | ||
133 | ret = gpio_request(gpio, DRV_NAME); | |
134 | if (ret) { | |
135 | dev_err(&pdev->dev, "GPIO request failed\n"); | |
136 | return ret; | |
137 | } | |
138 | ||
139 | /* allocate host */ | |
140 | ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS); | |
141 | if (!ah) | |
142 | return -ENOMEM; | |
143 | ||
144 | platform_set_drvdata(pdev, ah); | |
145 | ||
146 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
147 | if (!info) | |
148 | return -ENOMEM; | |
149 | ||
150 | ah->private_data = info; | |
151 | info->gpio_line = gpio; | |
152 | info->irq = irq; | |
153 | ||
154 | info->iobase = devm_ioremap_nocache(&pdev->dev, res->start, | |
041b5eac | 155 | resource_size(res)); |
3db691da FF |
156 | if (!info->iobase) |
157 | return -ENOMEM; | |
158 | ||
159 | ret = gpio_direction_input(gpio); | |
160 | if (ret) { | |
161 | dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n", | |
162 | ret); | |
163 | goto err_free_gpio; | |
164 | } | |
165 | ||
3dd654bf | 166 | rb532_pata_setup_ports(ah); |
3db691da | 167 | |
3dd654bf RB |
168 | ret = ata_host_activate(ah, irq, rb532_pata_irq_handler, |
169 | IRQF_TRIGGER_LOW, &rb532_pata_sht); | |
3db691da FF |
170 | if (ret) |
171 | goto err_free_gpio; | |
172 | ||
173 | return 0; | |
174 | ||
175 | err_free_gpio: | |
176 | gpio_free(gpio); | |
177 | ||
178 | return ret; | |
179 | } | |
180 | ||
3dd654bf | 181 | static __devexit int rb532_pata_driver_remove(struct platform_device *pdev) |
3db691da FF |
182 | { |
183 | struct ata_host *ah = platform_get_drvdata(pdev); | |
3dd654bf | 184 | struct rb532_cf_info *info = ah->private_data; |
3db691da FF |
185 | |
186 | ata_host_detach(ah); | |
187 | gpio_free(info->gpio_line); | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
458622fc KS |
192 | /* work with hotplug and coldplug */ |
193 | MODULE_ALIAS("platform:" DRV_NAME); | |
194 | ||
3dd654bf RB |
195 | static struct platform_driver rb532_pata_platform_driver = { |
196 | .probe = rb532_pata_driver_probe, | |
197 | .remove = __devexit_p(rb532_pata_driver_remove), | |
3db691da FF |
198 | .driver = { |
199 | .name = DRV_NAME, | |
200 | .owner = THIS_MODULE, | |
201 | }, | |
202 | }; | |
203 | ||
204 | /* ------------------------------------------------------------------------ */ | |
205 | ||
206 | #define DRV_INFO DRV_DESC " version " DRV_VERSION | |
207 | ||
3dd654bf | 208 | static int __init rb532_pata_module_init(void) |
3db691da FF |
209 | { |
210 | printk(KERN_INFO DRV_INFO "\n"); | |
211 | ||
3dd654bf | 212 | return platform_driver_register(&rb532_pata_platform_driver); |
3db691da FF |
213 | } |
214 | ||
3dd654bf | 215 | static void __exit rb532_pata_module_exit(void) |
3db691da | 216 | { |
3dd654bf | 217 | platform_driver_unregister(&rb532_pata_platform_driver); |
3db691da FF |
218 | } |
219 | ||
220 | MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); | |
221 | MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); | |
222 | MODULE_DESCRIPTION(DRV_DESC); | |
223 | MODULE_VERSION(DRV_VERSION); | |
224 | MODULE_LICENSE("GPL"); | |
225 | ||
3dd654bf RB |
226 | module_init(rb532_pata_module_init); |
227 | module_exit(rb532_pata_module_exit); |