1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22#include <linux/gfp.h>
23#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>
30
31#include <linux/libata.h>
32#include <scsi/scsi_host.h>
33
34#include <asm/gpio.h>
35
36#define DRV_NAME "pata-rb532-cf"
37#define DRV_VERSION "0.1.0"
38#define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash"
39
40#define RB500_CF_MAXPORTS 1
41#define RB500_CF_IO_DELAY 400
42
43#define RB500_CF_REG_BASE 0x0800
44#define RB500_CF_REG_ERR 0x080D
45#define RB500_CF_REG_CTRL 0x080E
46
47#define RB500_CF_REG_DBUF32 0x0C00
48
49struct rb532_cf_info {
50 void __iomem *iobase;
51 unsigned int gpio_line;
52 unsigned int irq;
53};
54
55
56
57static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
58{
59 struct ata_host *ah = dev_instance;
60 struct rb532_cf_info *info = ah->private_data;
61
62 if (gpio_get_value(info->gpio_line)) {
63 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
64 ata_sff_interrupt(info->irq, dev_instance);
65 } else {
66 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
67 }
68
69 return IRQ_HANDLED;
70}
71
72static struct ata_port_operations rb532_pata_port_ops = {
73 .inherits = &ata_sff_port_ops,
74 .sff_data_xfer = ata_sff_data_xfer32,
75};
76
77
78
79static struct scsi_host_template rb532_pata_sht = {
80 ATA_PIO_SHT(DRV_NAME),
81};
82
83
84
85static void rb532_pata_setup_ports(struct ata_host *ah)
86{
87 struct rb532_cf_info *info = ah->private_data;
88 struct ata_port *ap;
89
90 ap = ah->ports[0];
91
92 ap->ops = &rb532_pata_port_ops;
93 ap->pio_mask = ATA_PIO4;
94
95 ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE;
96 ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL;
97 ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
98
99 ata_sff_std_ports(&ap->ioaddr);
100
101 ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32;
102 ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR;
103}
104
105static __devinit int rb532_pata_driver_probe(struct platform_device *pdev)
106{
107 int irq;
108 int gpio;
109 struct resource *res;
110 struct ata_host *ah;
111 struct rb532_cf_info *info;
112 int ret;
113
114 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
115 if (!res) {
116 dev_err(&pdev->dev, "no IOMEM resource found\n");
117 return -EINVAL;
118 }
119
120 irq = platform_get_irq(pdev, 0);
121 if (irq <= 0) {
122 dev_err(&pdev->dev, "no IRQ resource found\n");
123 return -ENOENT;
124 }
125
126 gpio = irq_to_gpio(irq);
127 if (gpio < 0) {
128 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
129 return -ENOENT;
130 }
131
132 ret = gpio_request(gpio, DRV_NAME);
133 if (ret) {
134 dev_err(&pdev->dev, "GPIO request failed\n");
135 return ret;
136 }
137
138
139 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
140 if (!ah)
141 return -ENOMEM;
142
143 platform_set_drvdata(pdev, ah);
144
145 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
146 if (!info)
147 return -ENOMEM;
148
149 ah->private_data = info;
150 info->gpio_line = gpio;
151 info->irq = irq;
152
153 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
154 resource_size(res));
155 if (!info->iobase)
156 return -ENOMEM;
157
158 ret = gpio_direction_input(gpio);
159 if (ret) {
160 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
161 ret);
162 goto err_free_gpio;
163 }
164
165 rb532_pata_setup_ports(ah);
166
167 ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
168 IRQF_TRIGGER_LOW, &rb532_pata_sht);
169 if (ret)
170 goto err_free_gpio;
171
172 return 0;
173
174err_free_gpio:
175 gpio_free(gpio);
176
177 return ret;
178}
179
180static __devexit int rb532_pata_driver_remove(struct platform_device *pdev)
181{
182 struct ata_host *ah = platform_get_drvdata(pdev);
183 struct rb532_cf_info *info = ah->private_data;
184
185 ata_host_detach(ah);
186 gpio_free(info->gpio_line);
187
188 return 0;
189}
190
191static struct platform_driver rb532_pata_platform_driver = {
192 .probe = rb532_pata_driver_probe,
193 .remove = __devexit_p(rb532_pata_driver_remove),
194 .driver = {
195 .name = DRV_NAME,
196 .owner = THIS_MODULE,
197 },
198};
199
200#define DRV_INFO DRV_DESC " version " DRV_VERSION
201
202module_platform_driver(rb532_pata_platform_driver);
203
204MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
205MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
206MODULE_DESCRIPTION(DRV_DESC);
207MODULE_VERSION(DRV_VERSION);
208MODULE_LICENSE("GPL");
209MODULE_ALIAS("platform:" DRV_NAME);
210
