2 * A low-level PATA driver to handle a Compact Flash connected on the
3 * Mikrotik's RouterBoard 532 board.
5 * Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
6 * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
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>
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.
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.
22 #include <linux/gfp.h>
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/platform_device.h>
28 #include <linux/interrupt.h>
29 #include <linux/irq.h>
31 #include <linux/libata.h>
32 #include <scsi/scsi_host.h>
36 #define DRV_NAME "pata-rb532-cf"
37 #define DRV_VERSION "0.1.0"
38 #define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash"
40 #define RB500_CF_MAXPORTS 1
41 #define RB500_CF_IO_DELAY 400
43 #define RB500_CF_REG_BASE 0x0800
44 #define RB500_CF_REG_ERR 0x080D
45 #define RB500_CF_REG_CTRL 0x080E
46 /* 32bit buffered data register offset */
47 #define RB500_CF_REG_DBUF32 0x0C00
49 struct rb532_cf_info {
51 unsigned int gpio_line;
55 /* ------------------------------------------------------------------------ */
57 static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
59 struct ata_host *ah = dev_instance;
60 struct rb532_cf_info *info = ah->private_data;
62 if (gpio_get_value(info->gpio_line)) {
63 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
64 ata_sff_interrupt(info->irq, dev_instance);
66 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
72 static struct ata_port_operations rb532_pata_port_ops = {
73 .inherits = &ata_sff_port_ops,
74 .sff_data_xfer = ata_sff_data_xfer32,
77 /* ------------------------------------------------------------------------ */
79 static struct scsi_host_template rb532_pata_sht = {
80 ATA_PIO_SHT(DRV_NAME),
83 /* ------------------------------------------------------------------------ */
85 static void rb532_pata_setup_ports(struct ata_host *ah)
87 struct rb532_cf_info *info = ah->private_data;
92 ap->ops = &rb532_pata_port_ops;
93 ap->pio_mask = ATA_PIO4;
95 ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE;
96 ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL;
97 ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
99 ata_sff_std_ports(&ap->ioaddr);
101 ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32;
102 ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR;
105 static __devinit int rb532_pata_driver_probe(struct platform_device *pdev)
109 struct resource *res;
111 struct rb532_cf_info *info;
114 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
116 dev_err(&pdev->dev, "no IOMEM resource found\n");
120 irq = platform_get_irq(pdev, 0);
122 dev_err(&pdev->dev, "no IRQ resource found\n");
126 gpio = irq_to_gpio(irq);
128 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
132 ret = gpio_request(gpio, DRV_NAME);
134 dev_err(&pdev->dev, "GPIO request failed\n");
139 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
143 platform_set_drvdata(pdev, ah);
145 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
149 ah->private_data = info;
150 info->gpio_line = gpio;
153 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
158 ret = gpio_direction_input(gpio);
160 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
165 rb532_pata_setup_ports(ah);
167 ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
168 IRQF_TRIGGER_LOW, &rb532_pata_sht);
180 static __devexit int rb532_pata_driver_remove(struct platform_device *pdev)
182 struct ata_host *ah = platform_get_drvdata(pdev);
183 struct rb532_cf_info *info = ah->private_data;
186 gpio_free(info->gpio_line);
191 /* work with hotplug and coldplug */
192 MODULE_ALIAS("platform:" DRV_NAME);
194 static struct platform_driver rb532_pata_platform_driver = {
195 .probe = rb532_pata_driver_probe,
196 .remove = __devexit_p(rb532_pata_driver_remove),
199 .owner = THIS_MODULE,
203 /* ------------------------------------------------------------------------ */
205 #define DRV_INFO DRV_DESC " version " DRV_VERSION
207 static int __init rb532_pata_module_init(void)
209 printk(KERN_INFO DRV_INFO "\n");
211 return platform_driver_register(&rb532_pata_platform_driver);
214 static void __exit rb532_pata_module_exit(void)
216 platform_driver_unregister(&rb532_pata_platform_driver);
219 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
220 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
221 MODULE_DESCRIPTION(DRV_DESC);
222 MODULE_VERSION(DRV_VERSION);
223 MODULE_LICENSE("GPL");
225 module_init(rb532_pata_module_init);
226 module_exit(rb532_pata_module_exit);