1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * A low-level PATA driver to handle a Compact Flash connected on the
4 * Mikrotik's RouterBoard 532 board.
5 *
6 * Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
7 * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
8 *
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>
12 *
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.
16 */
17
18 #include <linux/gfp.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/platform_device.h>
22
23 #include <linux/io.h>
24 #include <linux/interrupt.h>
25 #include <linux/irq.h>
26 #include <linux/gpio/consumer.h>
27
28 #include <linux/libata.h>
29 #include <scsi/scsi_host.h>
30
31 #include <asm/mach-rc32434/rb.h>
32
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"
36
37 #define RB500_CF_MAXPORTS 1
38 #define RB500_CF_IO_DELAY 400
39
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
45
46 struct rb532_cf_info {
47 void __iomem *iobase;
48 struct gpio_desc *gpio_line;
49 unsigned int irq;
50 };
51
52 /* ------------------------------------------------------------------------ */
53
rb532_pata_irq_handler(int irq,void * dev_instance)54 static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
55 {
56 struct ata_host *ah = dev_instance;
57 struct rb532_cf_info *info = ah->private_data;
58
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);
62 } else {
63 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
64 }
65
66 return IRQ_HANDLED;
67 }
68
69 static struct ata_port_operations rb532_pata_port_ops = {
70 .inherits = &ata_sff_port_ops,
71 .sff_data_xfer = ata_sff_data_xfer32,
72 };
73
74 /* ------------------------------------------------------------------------ */
75
76 static struct scsi_host_template rb532_pata_sht = {
77 ATA_PIO_SHT(DRV_NAME),
78 };
79
80 /* ------------------------------------------------------------------------ */
81
rb532_pata_setup_ports(struct ata_host * ah)82 static void rb532_pata_setup_ports(struct ata_host *ah)
83 {
84 struct rb532_cf_info *info = ah->private_data;
85 struct ata_port *ap;
86
87 ap = ah->ports[0];
88
89 ap->ops = &rb532_pata_port_ops;
90 ap->pio_mask = ATA_PIO4;
91
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;
95
96 ata_sff_std_ports(&ap->ioaddr);
97
98 ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32;
99 ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR;
100 }
101
rb532_pata_driver_probe(struct platform_device * pdev)102 static int rb532_pata_driver_probe(struct platform_device *pdev)
103 {
104 int irq;
105 struct gpio_desc *gpiod;
106 struct resource *res;
107 struct ata_host *ah;
108 struct rb532_cf_info *info;
109 int ret;
110
111 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
112 if (!res) {
113 dev_err(&pdev->dev, "no IOMEM resource found\n");
114 return -EINVAL;
115 }
116
117 irq = platform_get_irq(pdev, 0);
118 if (irq < 0) {
119 dev_err(&pdev->dev, "no IRQ resource found\n");
120 return irq;
121 }
122 if (!irq)
123 return -EINVAL;
124
125 gpiod = devm_gpiod_get(&pdev->dev, NULL, GPIOD_IN);
126 if (IS_ERR(gpiod)) {
127 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
128 return PTR_ERR(gpiod);
129 }
130 gpiod_set_consumer_name(gpiod, DRV_NAME);
131
132 /* allocate host */
133 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
134 if (!ah)
135 return -ENOMEM;
136
137 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
138 if (!info)
139 return -ENOMEM;
140
141 ah->private_data = info;
142 info->gpio_line = gpiod;
143 info->irq = irq;
144
145 info->iobase = devm_ioremap(&pdev->dev, res->start,
146 resource_size(res));
147 if (!info->iobase)
148 return -ENOMEM;
149
150 rb532_pata_setup_ports(ah);
151
152 ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
153 IRQF_TRIGGER_LOW, &rb532_pata_sht);
154 if (ret)
155 return ret;
156
157 return 0;
158 }
159
rb532_pata_driver_remove(struct platform_device * pdev)160 static int rb532_pata_driver_remove(struct platform_device *pdev)
161 {
162 struct ata_host *ah = platform_get_drvdata(pdev);
163
164 ata_host_detach(ah);
165
166 return 0;
167 }
168
169 static struct platform_driver rb532_pata_platform_driver = {
170 .probe = rb532_pata_driver_probe,
171 .remove = rb532_pata_driver_remove,
172 .driver = {
173 .name = DRV_NAME,
174 },
175 };
176
177 #define DRV_INFO DRV_DESC " version " DRV_VERSION
178
179 module_platform_driver(rb532_pata_platform_driver);
180
181 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
182 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
183 MODULE_DESCRIPTION(DRV_DESC);
184 MODULE_VERSION(DRV_VERSION);
185 MODULE_LICENSE("GPL");
186 MODULE_ALIAS("platform:" DRV_NAME);
187