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/kernel.h>
23 #include <linux/module.h>
24 #include <linux/platform_device.h>
27 #include <linux/interrupt.h>
28 #include <linux/irq.h>
30 #include <linux/libata.h>
31 #include <scsi/scsi_host.h>
35 #define DRV_NAME "pata-rb532-cf"
36 #define DRV_VERSION "0.1.0"
37 #define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash"
39 #define RB500_CF_MAXPORTS 1
40 #define RB500_CF_IO_DELAY 400
42 #define RB500_CF_REG_CMD 0x0800
43 #define RB500_CF_REG_CTRL 0x080E
44 #define RB500_CF_REG_DATA 0x0C00
46 struct rb532_cf_info {
48 unsigned int gpio_line;
53 /* ------------------------------------------------------------------------ */
55 static inline void rb532_pata_finish_io(struct ata_port *ap)
57 struct ata_host *ah = ap->host;
58 struct rb532_cf_info *info = ah->private_data;
60 ata_sff_altstatus(ap);
61 ndelay(RB500_CF_IO_DELAY);
63 set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
66 static void rb532_pata_exec_command(struct ata_port *ap,
67 const struct ata_taskfile *tf)
69 writeb(tf->command, ap->ioaddr.command_addr);
70 rb532_pata_finish_io(ap);
73 static void rb532_pata_data_xfer(struct ata_device *adev, unsigned char *buf,
74 unsigned int buflen, int write_data)
76 struct ata_port *ap = adev->link->ap;
77 void __iomem *ioaddr = ap->ioaddr.data_addr;
80 for (; buflen > 0; buflen--, buf++)
83 for (; buflen > 0; buflen--, buf++)
87 rb532_pata_finish_io(adev->link->ap);
90 static void rb532_pata_freeze(struct ata_port *ap)
92 struct rb532_cf_info *info = ap->host->private_data;
97 static void rb532_pata_thaw(struct ata_port *ap)
99 struct rb532_cf_info *info = ap->host->private_data;
104 static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
106 struct ata_host *ah = dev_instance;
107 struct rb532_cf_info *info = ah->private_data;
109 if (gpio_get_value(info->gpio_line)) {
110 set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
112 ata_sff_interrupt(info->irq, dev_instance);
114 set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
120 static struct ata_port_operations rb532_pata_port_ops = {
121 .inherits = &ata_sff_port_ops,
122 .sff_exec_command = rb532_pata_exec_command,
123 .sff_data_xfer = rb532_pata_data_xfer,
124 .freeze = rb532_pata_freeze,
125 .thaw = rb532_pata_thaw,
128 /* ------------------------------------------------------------------------ */
130 static struct scsi_host_template rb532_pata_sht = {
131 ATA_PIO_SHT(DRV_NAME),
134 /* ------------------------------------------------------------------------ */
136 static void rb532_pata_setup_ports(struct ata_host *ah)
138 struct rb532_cf_info *info = ah->private_data;
143 ap->ops = &rb532_pata_port_ops;
144 ap->pio_mask = 0x1f; /* PIO4 */
145 ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;
147 ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_CMD;
148 ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL;
149 ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
151 ata_sff_std_ports(&ap->ioaddr);
153 ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DATA;
156 static __devinit int rb532_pata_driver_probe(struct platform_device *pdev)
160 struct resource *res;
162 struct rb532_cf_info *info;
165 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
167 dev_err(&pdev->dev, "no IOMEM resource found\n");
171 irq = platform_get_irq(pdev, 0);
173 dev_err(&pdev->dev, "no IRQ resource found\n");
177 gpio = irq_to_gpio(irq);
179 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
183 ret = gpio_request(gpio, DRV_NAME);
185 dev_err(&pdev->dev, "GPIO request failed\n");
190 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
194 platform_set_drvdata(pdev, ah);
196 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
200 ah->private_data = info;
201 info->gpio_line = gpio;
204 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
205 res->end - res->start + 1);
209 ret = gpio_direction_input(gpio);
211 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
216 rb532_pata_setup_ports(ah);
218 ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
219 IRQF_TRIGGER_LOW, &rb532_pata_sht);
231 static __devexit int rb532_pata_driver_remove(struct platform_device *pdev)
233 struct ata_host *ah = platform_get_drvdata(pdev);
234 struct rb532_cf_info *info = ah->private_data;
237 gpio_free(info->gpio_line);
242 /* work with hotplug and coldplug */
243 MODULE_ALIAS("platform:" DRV_NAME);
245 static struct platform_driver rb532_pata_platform_driver = {
246 .probe = rb532_pata_driver_probe,
247 .remove = __devexit_p(rb532_pata_driver_remove),
250 .owner = THIS_MODULE,
254 /* ------------------------------------------------------------------------ */
256 #define DRV_INFO DRV_DESC " version " DRV_VERSION
258 static int __init rb532_pata_module_init(void)
260 printk(KERN_INFO DRV_INFO "\n");
262 return platform_driver_register(&rb532_pata_platform_driver);
265 static void __exit rb532_pata_module_exit(void)
267 platform_driver_unregister(&rb532_pata_platform_driver);
270 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
271 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
272 MODULE_DESCRIPTION(DRV_DESC);
273 MODULE_VERSION(DRV_VERSION);
274 MODULE_LICENSE("GPL");
276 module_init(rb532_pata_module_init);
277 module_exit(rb532_pata_module_exit);