1 // SPDX-License-Identifier: GPL-2.0-only
3 * A low-level PATA driver to handle a Compact Flash connected on the
4 * Mikrotik's RouterBoard 532 board.
6 * Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
7 * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
9 * This file was based on: drivers/ata/pata_ixp4xx_cf.c
10 * Copyright (C) 2006-07 Tower Technologies
11 * Author: Alessandro Zummo <a.zummo@towertech.it>
13 * Also was based on the driver for Linux 2.4.xx published by Mikrotik for
14 * their RouterBoard 1xx and 5xx series devices. The original Mikrotik code
15 * seems not to have a license.
18 #include <linux/gfp.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/platform_device.h>
24 #include <linux/interrupt.h>
25 #include <linux/irq.h>
26 #include <linux/gpio/consumer.h>
28 #include <linux/libata.h>
29 #include <scsi/scsi_host.h>
31 #include <asm/mach-rc32434/rb.h>
33 #define DRV_NAME "pata-rb532-cf"
34 #define DRV_VERSION "0.1.0"
35 #define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash"
37 #define RB500_CF_MAXPORTS 1
38 #define RB500_CF_IO_DELAY 400
40 #define RB500_CF_REG_BASE 0x0800
41 #define RB500_CF_REG_ERR 0x080D
42 #define RB500_CF_REG_CTRL 0x080E
43 /* 32bit buffered data register offset */
44 #define RB500_CF_REG_DBUF32 0x0C00
46 struct rb532_cf_info {
48 struct gpio_desc *gpio_line;
52 /* ------------------------------------------------------------------------ */
54 static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
56 struct ata_host *ah = dev_instance;
57 struct rb532_cf_info *info = ah->private_data;
59 if (gpiod_get_value(info->gpio_line)) {
60 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
61 ata_sff_interrupt(info->irq, dev_instance);
63 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
69 static struct ata_port_operations rb532_pata_port_ops = {
70 .inherits = &ata_sff_port_ops,
71 .sff_data_xfer = ata_sff_data_xfer32,
74 /* ------------------------------------------------------------------------ */
76 static const struct scsi_host_template rb532_pata_sht = {
77 ATA_PIO_SHT(DRV_NAME),
80 /* ------------------------------------------------------------------------ */
82 static void rb532_pata_setup_ports(struct ata_host *ah)
84 struct rb532_cf_info *info = ah->private_data;
89 ap->ops = &rb532_pata_port_ops;
90 ap->pio_mask = ATA_PIO4;
92 ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE;
93 ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL;
94 ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
96 ata_sff_std_ports(&ap->ioaddr);
98 ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32;
99 ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR;
102 static int rb532_pata_driver_probe(struct platform_device *pdev)
105 struct gpio_desc *gpiod;
106 struct resource *res;
108 struct rb532_cf_info *info;
111 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
113 dev_err(&pdev->dev, "no IOMEM resource found\n");
117 irq = platform_get_irq(pdev, 0);
123 gpiod = devm_gpiod_get(&pdev->dev, NULL, GPIOD_IN);
125 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
126 return PTR_ERR(gpiod);
128 gpiod_set_consumer_name(gpiod, DRV_NAME);
131 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
135 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
139 ah->private_data = info;
140 info->gpio_line = gpiod;
143 info->iobase = devm_ioremap(&pdev->dev, res->start,
148 rb532_pata_setup_ports(ah);
150 ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
151 IRQF_TRIGGER_LOW, &rb532_pata_sht);
158 static void rb532_pata_driver_remove(struct platform_device *pdev)
160 struct ata_host *ah = platform_get_drvdata(pdev);
165 static struct platform_driver rb532_pata_platform_driver = {
166 .probe = rb532_pata_driver_probe,
167 .remove_new = rb532_pata_driver_remove,
173 #define DRV_INFO DRV_DESC " version " DRV_VERSION
175 module_platform_driver(rb532_pata_platform_driver);
177 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
178 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
179 MODULE_DESCRIPTION(DRV_DESC);
180 MODULE_VERSION(DRV_VERSION);
181 MODULE_LICENSE("GPL");
182 MODULE_ALIAS("platform:" DRV_NAME);