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-rb500-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 rb500_cf_info {
48 unsigned int gpio_line;
53 /* ------------------------------------------------------------------------ */
55 static inline void rb500_pata_finish_io(struct ata_port *ap)
57 struct ata_host *ah = ap->host;
58 struct rb500_cf_info *info = ah->private_data;
61 ndelay(RB500_CF_IO_DELAY);
63 set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
66 static void rb500_pata_exec_command(struct ata_port *ap,
67 const struct ata_taskfile *tf)
69 writeb(tf->command, ap->ioaddr.command_addr);
70 rb500_pata_finish_io(ap);
73 static void rb500_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 rb500_pata_finish_io(adev->link->ap);
90 static void rb500_pata_freeze(struct ata_port *ap)
92 struct rb500_cf_info *info = ap->host->private_data;
97 static void rb500_pata_thaw(struct ata_port *ap)
99 struct rb500_cf_info *info = ap->host->private_data;
104 static irqreturn_t rb500_pata_irq_handler(int irq, void *dev_instance)
106 struct ata_host *ah = dev_instance;
107 struct rb500_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_interrupt(info->irq, dev_instance);
114 set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
120 static int rb500_pata_port_start(struct ata_port *ap)
125 static struct ata_port_operations rb500_pata_port_ops = {
126 .tf_load = ata_tf_load,
127 .tf_read = ata_tf_read,
129 .exec_command = rb500_pata_exec_command,
130 .check_status = ata_check_status,
131 .dev_select = ata_std_dev_select,
133 .data_xfer = rb500_pata_data_xfer,
135 .qc_prep = ata_qc_prep,
136 .qc_issue = ata_qc_issue_prot,
138 .freeze = rb500_pata_freeze,
139 .thaw = rb500_pata_thaw,
140 .error_handler = ata_bmdma_error_handler,
142 .irq_handler = rb500_pata_irq_handler,
143 .irq_clear = ata_noop_irq_clear,
144 .irq_on = ata_irq_on,
146 .port_start = rb500_pata_port_start,
149 /* ------------------------------------------------------------------------ */
151 static struct scsi_host_template rb500_pata_sht = {
152 .module = THIS_MODULE,
154 .ioctl = ata_scsi_ioctl,
155 .queuecommand = ata_scsi_queuecmd,
156 .slave_configure = ata_scsi_slave_config,
157 .slave_destroy = ata_scsi_slave_destroy,
158 .bios_param = ata_std_bios_param,
159 .proc_name = DRV_NAME,
161 .can_queue = ATA_DEF_QUEUE,
162 .this_id = ATA_SHT_THIS_ID,
163 .sg_tablesize = LIBATA_MAX_PRD,
164 .dma_boundary = ATA_DMA_BOUNDARY,
165 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
166 .emulated = ATA_SHT_EMULATED,
167 .use_clustering = ATA_SHT_USE_CLUSTERING,
170 /* ------------------------------------------------------------------------ */
172 static void rb500_pata_setup_ports(struct ata_host *ah)
174 struct rb500_cf_info *info = ah->private_data;
179 ap->ops = &rb500_pata_port_ops;
180 ap->pio_mask = 0x1f; /* PIO4 */
181 ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;
183 ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_CMD;
184 ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL;
185 ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
187 ata_std_ports(&ap->ioaddr);
189 ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DATA;
192 static __devinit int rb500_pata_driver_probe(struct platform_device *pdev)
196 struct resource *res;
198 struct rb500_cf_info *info;
201 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
203 dev_err(&pdev->dev, "no IOMEM resource found\n");
207 irq = platform_get_irq(pdev, 0);
209 dev_err(&pdev->dev, "no IRQ resource found\n");
213 gpio = irq_to_gpio(irq);
215 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
219 ret = gpio_request(gpio, DRV_NAME);
221 dev_err(&pdev->dev, "GPIO request failed\n");
226 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
230 platform_set_drvdata(pdev, ah);
232 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
236 ah->private_data = info;
237 info->gpio_line = gpio;
240 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
241 res->end - res->start + 1);
245 ret = gpio_direction_input(gpio);
247 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
252 rb500_pata_setup_ports(ah);
254 ret = ata_host_activate(ah, irq, rb500_pata_irq_handler,
255 IRQF_TRIGGER_LOW, &rb500_pata_sht);
267 static __devexit int rb500_pata_driver_remove(struct platform_device *pdev)
269 struct ata_host *ah = platform_get_drvdata(pdev);
270 struct rb500_cf_info *info = ah->private_data;
273 gpio_free(info->gpio_line);
278 static struct platform_driver rb500_pata_platform_driver = {
279 .probe = rb500_pata_driver_probe,
280 .remove = __devexit_p(rb500_pata_driver_remove),
283 .owner = THIS_MODULE,
287 /* ------------------------------------------------------------------------ */
289 #define DRV_INFO DRV_DESC " version " DRV_VERSION
291 static int __init rb500_pata_module_init(void)
293 printk(KERN_INFO DRV_INFO "\n");
295 return platform_driver_register(&rb500_pata_platform_driver);
298 static void __exit rb500_pata_module_exit(void)
300 platform_driver_unregister(&rb500_pata_platform_driver);
303 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
304 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
305 MODULE_DESCRIPTION(DRV_DESC);
306 MODULE_VERSION(DRV_VERSION);
307 MODULE_LICENSE("GPL");
309 module_init(rb500_pata_module_init);
310 module_exit(rb500_pata_module_exit);