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Florian Fainelli3db691d2008-03-06 12:25:21 +01001/*
2 * A low-level PATA driver to handle a Compact Flash connected on the
3 * Mikrotik's RouterBoard 532 board.
4 *
5 * Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
6 * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
7 *
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>
11 *
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.
15 *
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.
19 *
20 */
21
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/gfp.h>
Florian Fainelli3db691d2008-03-06 12:25:21 +010023#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/platform_device.h>
26
27#include <linux/io.h>
28#include <linux/interrupt.h>
29#include <linux/irq.h>
Alban Bedel832f5da2015-08-02 18:30:11 +020030#include <linux/gpio.h>
Florian Fainelli3db691d2008-03-06 12:25:21 +010031
32#include <linux/libata.h>
33#include <scsi/scsi_host.h>
34
Gabor Juhos01836172016-02-17 12:58:20 +010035#include <asm/mach-rc32434/rb.h>
36
Ralf Baechle3dd654b2008-04-28 12:41:36 +010037#define DRV_NAME "pata-rb532-cf"
Florian Fainelli3db691d2008-03-06 12:25:21 +010038#define DRV_VERSION "0.1.0"
39#define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash"
40
41#define RB500_CF_MAXPORTS 1
42#define RB500_CF_IO_DELAY 400
43
Phil Sutter9f147862008-11-28 20:48:26 +010044#define RB500_CF_REG_BASE 0x0800
45#define RB500_CF_REG_ERR 0x080D
Florian Fainelli3db691d2008-03-06 12:25:21 +010046#define RB500_CF_REG_CTRL 0x080E
Phil Sutter9f147862008-11-28 20:48:26 +010047/* 32bit buffered data register offset */
48#define RB500_CF_REG_DBUF32 0x0C00
Florian Fainelli3db691d2008-03-06 12:25:21 +010049
Ralf Baechle3dd654b2008-04-28 12:41:36 +010050struct rb532_cf_info {
Florian Fainelli3db691d2008-03-06 12:25:21 +010051 void __iomem *iobase;
52 unsigned int gpio_line;
Florian Fainelli3db691d2008-03-06 12:25:21 +010053 unsigned int irq;
54};
55
56/* ------------------------------------------------------------------------ */
57
Ralf Baechle3dd654b2008-04-28 12:41:36 +010058static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
Florian Fainelli3db691d2008-03-06 12:25:21 +010059{
60 struct ata_host *ah = dev_instance;
Ralf Baechle3dd654b2008-04-28 12:41:36 +010061 struct rb532_cf_info *info = ah->private_data;
Florian Fainelli3db691d2008-03-06 12:25:21 +010062
63 if (gpio_get_value(info->gpio_line)) {
Thomas Gleixnerdced35a2011-03-28 17:49:12 +020064 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
Phil Sutter6be976e2009-01-27 14:35:53 +010065 ata_sff_interrupt(info->irq, dev_instance);
Florian Fainelli3db691d2008-03-06 12:25:21 +010066 } else {
Thomas Gleixnerdced35a2011-03-28 17:49:12 +020067 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
Florian Fainelli3db691d2008-03-06 12:25:21 +010068 }
69
70 return IRQ_HANDLED;
71}
72
Ralf Baechle3dd654b2008-04-28 12:41:36 +010073static struct ata_port_operations rb532_pata_port_ops = {
Tejun Heo029cfd62008-03-25 12:22:49 +090074 .inherits = &ata_sff_port_ops,
Phil Sutter180bd142009-01-27 14:35:52 +010075 .sff_data_xfer = ata_sff_data_xfer32,
Florian Fainelli3db691d2008-03-06 12:25:21 +010076};
77
78/* ------------------------------------------------------------------------ */
79
Ralf Baechle3dd654b2008-04-28 12:41:36 +010080static struct scsi_host_template rb532_pata_sht = {
Tejun Heo68d1d072008-03-25 12:22:49 +090081 ATA_PIO_SHT(DRV_NAME),
Florian Fainelli3db691d2008-03-06 12:25:21 +010082};
83
84/* ------------------------------------------------------------------------ */
85
Ralf Baechle3dd654b2008-04-28 12:41:36 +010086static void rb532_pata_setup_ports(struct ata_host *ah)
Florian Fainelli3db691d2008-03-06 12:25:21 +010087{
Ralf Baechle3dd654b2008-04-28 12:41:36 +010088 struct rb532_cf_info *info = ah->private_data;
Florian Fainelli3db691d2008-03-06 12:25:21 +010089 struct ata_port *ap;
90
91 ap = ah->ports[0];
92
Ralf Baechle3dd654b2008-04-28 12:41:36 +010093 ap->ops = &rb532_pata_port_ops;
Erik Inge Bolsø14bdef92009-03-14 21:38:24 +010094 ap->pio_mask = ATA_PIO4;
Florian Fainelli3db691d2008-03-06 12:25:21 +010095
Phil Sutter9f147862008-11-28 20:48:26 +010096 ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE;
Florian Fainelli3db691d2008-03-06 12:25:21 +010097 ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL;
98 ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
99
Tejun Heo9363c382008-04-07 22:47:16 +0900100 ata_sff_std_ports(&ap->ioaddr);
Florian Fainelli3db691d2008-03-06 12:25:21 +0100101
Phil Sutter9f147862008-11-28 20:48:26 +0100102 ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32;
103 ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR;
Florian Fainelli3db691d2008-03-06 12:25:21 +0100104}
105
Greg Kroah-Hartman0ec24912012-12-21 13:19:58 -0800106static int rb532_pata_driver_probe(struct platform_device *pdev)
Florian Fainelli3db691d2008-03-06 12:25:21 +0100107{
Florian Fainelli9223d012009-03-13 15:41:43 +0100108 int irq;
Florian Fainelli3db691d2008-03-06 12:25:21 +0100109 int gpio;
110 struct resource *res;
111 struct ata_host *ah;
Gabor Juhos01836172016-02-17 12:58:20 +0100112 struct cf_device *pdata;
Ralf Baechle3dd654b2008-04-28 12:41:36 +0100113 struct rb532_cf_info *info;
Florian Fainelli3db691d2008-03-06 12:25:21 +0100114 int ret;
115
116 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
117 if (!res) {
118 dev_err(&pdev->dev, "no IOMEM resource found\n");
119 return -EINVAL;
120 }
121
122 irq = platform_get_irq(pdev, 0);
123 if (irq <= 0) {
124 dev_err(&pdev->dev, "no IRQ resource found\n");
125 return -ENOENT;
126 }
127
Gabor Juhos01836172016-02-17 12:58:20 +0100128 pdata = dev_get_platdata(&pdev->dev);
129 if (!pdata) {
130 dev_err(&pdev->dev, "no platform data specified\n");
131 return -EINVAL;
132 }
133
134 gpio = pdata->gpio_pin;
Florian Fainelli3db691d2008-03-06 12:25:21 +0100135 if (gpio < 0) {
136 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
137 return -ENOENT;
138 }
139
140 ret = gpio_request(gpio, DRV_NAME);
141 if (ret) {
142 dev_err(&pdev->dev, "GPIO request failed\n");
143 return ret;
144 }
145
146 /* allocate host */
147 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
148 if (!ah)
149 return -ENOMEM;
150
151 platform_set_drvdata(pdev, ah);
152
153 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
154 if (!info)
155 return -ENOMEM;
156
157 ah->private_data = info;
158 info->gpio_line = gpio;
159 info->irq = irq;
160
161 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
Julia Lawall041b5ea2009-08-06 16:05:08 -0700162 resource_size(res));
Florian Fainelli3db691d2008-03-06 12:25:21 +0100163 if (!info->iobase)
164 return -ENOMEM;
165
166 ret = gpio_direction_input(gpio);
167 if (ret) {
168 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
169 ret);
170 goto err_free_gpio;
171 }
172
Ralf Baechle3dd654b2008-04-28 12:41:36 +0100173 rb532_pata_setup_ports(ah);
Florian Fainelli3db691d2008-03-06 12:25:21 +0100174
Ralf Baechle3dd654b2008-04-28 12:41:36 +0100175 ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
176 IRQF_TRIGGER_LOW, &rb532_pata_sht);
Florian Fainelli3db691d2008-03-06 12:25:21 +0100177 if (ret)
178 goto err_free_gpio;
179
180 return 0;
181
182err_free_gpio:
183 gpio_free(gpio);
184
185 return ret;
186}
187
Greg Kroah-Hartman0ec24912012-12-21 13:19:58 -0800188static int rb532_pata_driver_remove(struct platform_device *pdev)
Florian Fainelli3db691d2008-03-06 12:25:21 +0100189{
190 struct ata_host *ah = platform_get_drvdata(pdev);
Ralf Baechle3dd654b2008-04-28 12:41:36 +0100191 struct rb532_cf_info *info = ah->private_data;
Florian Fainelli3db691d2008-03-06 12:25:21 +0100192
193 ata_host_detach(ah);
194 gpio_free(info->gpio_line);
195
196 return 0;
197}
198
Ralf Baechle3dd654b2008-04-28 12:41:36 +0100199static struct platform_driver rb532_pata_platform_driver = {
200 .probe = rb532_pata_driver_probe,
Greg Kroah-Hartman0ec24912012-12-21 13:19:58 -0800201 .remove = rb532_pata_driver_remove,
Florian Fainelli3db691d2008-03-06 12:25:21 +0100202 .driver = {
203 .name = DRV_NAME,
Florian Fainelli3db691d2008-03-06 12:25:21 +0100204 },
205};
206
Florian Fainelli3db691d2008-03-06 12:25:21 +0100207#define DRV_INFO DRV_DESC " version " DRV_VERSION
208
Axel Lin99c8ea32011-11-27 14:44:26 +0800209module_platform_driver(rb532_pata_platform_driver);
Florian Fainelli3db691d2008-03-06 12:25:21 +0100210
211MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
212MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
213MODULE_DESCRIPTION(DRV_DESC);
214MODULE_VERSION(DRV_VERSION);
215MODULE_LICENSE("GPL");
Axel Lin99c8ea32011-11-27 14:44:26 +0800216MODULE_ALIAS("platform:" DRV_NAME);