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 struct ata_port_operations rb500_pata_port_ops = {
121 .tf_load = ata_tf_load,
122 .tf_read = ata_tf_read,
124 .exec_command = rb500_pata_exec_command,
125 .check_status = ata_check_status,
126 .dev_select = ata_std_dev_select,
128 .data_xfer = rb500_pata_data_xfer,
130 .qc_prep = ata_qc_prep,
131 .qc_issue = ata_qc_issue_prot,
133 .freeze = rb500_pata_freeze,
134 .thaw = rb500_pata_thaw,
135 .error_handler = ata_bmdma_error_handler,
136 .post_internal_cmd = ata_bmdma_post_internal_cmd,
138 .irq_clear = ata_noop_irq_clear,
139 .irq_on = ata_irq_on,
142 /* ------------------------------------------------------------------------ */
144 static struct scsi_host_template rb500_pata_sht = {
145 .module = THIS_MODULE,
147 .ioctl = ata_scsi_ioctl,
148 .queuecommand = ata_scsi_queuecmd,
149 .slave_configure = ata_scsi_slave_config,
150 .slave_destroy = ata_scsi_slave_destroy,
151 .bios_param = ata_std_bios_param,
152 .proc_name = DRV_NAME,
154 .can_queue = ATA_DEF_QUEUE,
155 .this_id = ATA_SHT_THIS_ID,
156 .sg_tablesize = LIBATA_MAX_PRD,
157 .dma_boundary = ATA_DMA_BOUNDARY,
158 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
159 .emulated = ATA_SHT_EMULATED,
160 .use_clustering = ATA_SHT_USE_CLUSTERING,
163 /* ------------------------------------------------------------------------ */
165 static void rb500_pata_setup_ports(struct ata_host *ah)
167 struct rb500_cf_info *info = ah->private_data;
172 ap->ops = &rb500_pata_port_ops;
173 ap->pio_mask = 0x1f; /* PIO4 */
174 ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;
176 ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_CMD;
177 ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL;
178 ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
180 ata_std_ports(&ap->ioaddr);
182 ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DATA;
185 static __devinit int rb500_pata_driver_probe(struct platform_device *pdev)
189 struct resource *res;
191 struct rb500_cf_info *info;
194 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
196 dev_err(&pdev->dev, "no IOMEM resource found\n");
200 irq = platform_get_irq(pdev, 0);
202 dev_err(&pdev->dev, "no IRQ resource found\n");
206 gpio = irq_to_gpio(irq);
208 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
212 ret = gpio_request(gpio, DRV_NAME);
214 dev_err(&pdev->dev, "GPIO request failed\n");
219 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
223 platform_set_drvdata(pdev, ah);
225 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
229 ah->private_data = info;
230 info->gpio_line = gpio;
233 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
234 res->end - res->start + 1);
238 ret = gpio_direction_input(gpio);
240 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
245 rb500_pata_setup_ports(ah);
247 ret = ata_host_activate(ah, irq, rb500_pata_irq_handler,
248 IRQF_TRIGGER_LOW, &rb500_pata_sht);
260 static __devexit int rb500_pata_driver_remove(struct platform_device *pdev)
262 struct ata_host *ah = platform_get_drvdata(pdev);
263 struct rb500_cf_info *info = ah->private_data;
266 gpio_free(info->gpio_line);
271 static struct platform_driver rb500_pata_platform_driver = {
272 .probe = rb500_pata_driver_probe,
273 .remove = __devexit_p(rb500_pata_driver_remove),
276 .owner = THIS_MODULE,
280 /* ------------------------------------------------------------------------ */
282 #define DRV_INFO DRV_DESC " version " DRV_VERSION
284 static int __init rb500_pata_module_init(void)
286 printk(KERN_INFO DRV_INFO "\n");
288 return platform_driver_register(&rb500_pata_platform_driver);
291 static void __exit rb500_pata_module_exit(void)
293 platform_driver_unregister(&rb500_pata_platform_driver);
296 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
297 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
298 MODULE_DESCRIPTION(DRV_DESC);
299 MODULE_VERSION(DRV_VERSION);
300 MODULE_LICENSE("GPL");
302 module_init(rb500_pata_module_init);
303 module_exit(rb500_pata_module_exit);