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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 | ||
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; | |
3db691da FF |
51 | unsigned int irq; |
52 | }; | |
53 | ||
54 | /* ------------------------------------------------------------------------ */ | |
55 | ||
3dd654bf | 56 | static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance) |
3db691da FF |
57 | { |
58 | struct ata_host *ah = dev_instance; | |
3dd654bf | 59 | struct rb532_cf_info *info = ah->private_data; |
3db691da FF |
60 | |
61 | if (gpio_get_value(info->gpio_line)) { | |
dced35ae | 62 | irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW); |
6be976e7 | 63 | ata_sff_interrupt(info->irq, dev_instance); |
3db691da | 64 | } else { |
dced35ae | 65 | irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH); |
3db691da FF |
66 | } |
67 | ||
68 | return IRQ_HANDLED; | |
69 | } | |
70 | ||
3dd654bf | 71 | static struct ata_port_operations rb532_pata_port_ops = { |
029cfd6b | 72 | .inherits = &ata_sff_port_ops, |
180bd147 | 73 | .sff_data_xfer = ata_sff_data_xfer32, |
3db691da FF |
74 | }; |
75 | ||
76 | /* ------------------------------------------------------------------------ */ | |
77 | ||
3dd654bf | 78 | static struct scsi_host_template rb532_pata_sht = { |
68d1d07b | 79 | ATA_PIO_SHT(DRV_NAME), |
3db691da FF |
80 | }; |
81 | ||
82 | /* ------------------------------------------------------------------------ */ | |
83 | ||
3dd654bf | 84 | static void rb532_pata_setup_ports(struct ata_host *ah) |
3db691da | 85 | { |
3dd654bf | 86 | struct rb532_cf_info *info = ah->private_data; |
3db691da FF |
87 | struct ata_port *ap; |
88 | ||
89 | ap = ah->ports[0]; | |
90 | ||
3dd654bf | 91 | ap->ops = &rb532_pata_port_ops; |
14bdef98 | 92 | ap->pio_mask = ATA_PIO4; |
3db691da | 93 | |
9f14786e | 94 | ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE; |
3db691da FF |
95 | ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL; |
96 | ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL; | |
97 | ||
9363c382 | 98 | ata_sff_std_ports(&ap->ioaddr); |
3db691da | 99 | |
9f14786e PS |
100 | ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32; |
101 | ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR; | |
3db691da FF |
102 | } |
103 | ||
0ec24914 | 104 | static int rb532_pata_driver_probe(struct platform_device *pdev) |
3db691da | 105 | { |
9223d01b | 106 | int irq; |
3db691da FF |
107 | int gpio; |
108 | struct resource *res; | |
109 | struct ata_host *ah; | |
3dd654bf | 110 | struct rb532_cf_info *info; |
3db691da FF |
111 | int ret; |
112 | ||
113 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
114 | if (!res) { | |
115 | dev_err(&pdev->dev, "no IOMEM resource found\n"); | |
116 | return -EINVAL; | |
117 | } | |
118 | ||
119 | irq = platform_get_irq(pdev, 0); | |
120 | if (irq <= 0) { | |
121 | dev_err(&pdev->dev, "no IRQ resource found\n"); | |
122 | return -ENOENT; | |
123 | } | |
124 | ||
125 | gpio = irq_to_gpio(irq); | |
126 | if (gpio < 0) { | |
127 | dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq); | |
128 | return -ENOENT; | |
129 | } | |
130 | ||
131 | ret = gpio_request(gpio, DRV_NAME); | |
132 | if (ret) { | |
133 | dev_err(&pdev->dev, "GPIO request failed\n"); | |
134 | return ret; | |
135 | } | |
136 | ||
137 | /* allocate host */ | |
138 | ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS); | |
139 | if (!ah) | |
140 | return -ENOMEM; | |
141 | ||
142 | platform_set_drvdata(pdev, ah); | |
143 | ||
144 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
145 | if (!info) | |
146 | return -ENOMEM; | |
147 | ||
148 | ah->private_data = info; | |
149 | info->gpio_line = gpio; | |
150 | info->irq = irq; | |
151 | ||
152 | info->iobase = devm_ioremap_nocache(&pdev->dev, res->start, | |
041b5eac | 153 | resource_size(res)); |
3db691da FF |
154 | if (!info->iobase) |
155 | return -ENOMEM; | |
156 | ||
157 | ret = gpio_direction_input(gpio); | |
158 | if (ret) { | |
159 | dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n", | |
160 | ret); | |
161 | goto err_free_gpio; | |
162 | } | |
163 | ||
3dd654bf | 164 | rb532_pata_setup_ports(ah); |
3db691da | 165 | |
3dd654bf RB |
166 | ret = ata_host_activate(ah, irq, rb532_pata_irq_handler, |
167 | IRQF_TRIGGER_LOW, &rb532_pata_sht); | |
3db691da FF |
168 | if (ret) |
169 | goto err_free_gpio; | |
170 | ||
171 | return 0; | |
172 | ||
173 | err_free_gpio: | |
174 | gpio_free(gpio); | |
175 | ||
176 | return ret; | |
177 | } | |
178 | ||
0ec24914 | 179 | static int rb532_pata_driver_remove(struct platform_device *pdev) |
3db691da FF |
180 | { |
181 | struct ata_host *ah = platform_get_drvdata(pdev); | |
3dd654bf | 182 | struct rb532_cf_info *info = ah->private_data; |
3db691da FF |
183 | |
184 | ata_host_detach(ah); | |
185 | gpio_free(info->gpio_line); | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
3dd654bf RB |
190 | static struct platform_driver rb532_pata_platform_driver = { |
191 | .probe = rb532_pata_driver_probe, | |
0ec24914 | 192 | .remove = rb532_pata_driver_remove, |
3db691da FF |
193 | .driver = { |
194 | .name = DRV_NAME, | |
3db691da FF |
195 | }, |
196 | }; | |
197 | ||
3db691da FF |
198 | #define DRV_INFO DRV_DESC " version " DRV_VERSION |
199 | ||
99c8ea3e | 200 | module_platform_driver(rb532_pata_platform_driver); |
3db691da FF |
201 | |
202 | MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); | |
203 | MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); | |
204 | MODULE_DESCRIPTION(DRV_DESC); | |
205 | MODULE_VERSION(DRV_VERSION); | |
206 | MODULE_LICENSE("GPL"); | |
99c8ea3e | 207 | MODULE_ALIAS("platform:" DRV_NAME); |