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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#include <linux/gpio.h>
31
32#include <linux/libata.h>
33#include <scsi/scsi_host.h>
34
35#include <asm/mach-rc32434/rb.h>
36
37#define DRV_NAME "pata-rb532-cf"
38#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
44#define RB500_CF_REG_BASE 0x0800
45#define RB500_CF_REG_ERR 0x080D
46#define RB500_CF_REG_CTRL 0x080E
47
48#define RB500_CF_REG_DBUF32 0x0C00
49
50struct rb532_cf_info {
51 void __iomem *iobase;
52 unsigned int gpio_line;
53 unsigned int irq;
54};
55
56
57
58static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
59{
60 struct ata_host *ah = dev_instance;
61 struct rb532_cf_info *info = ah->private_data;
62
63 if (gpio_get_value(info->gpio_line)) {
64 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
65 ata_sff_interrupt(info->irq, dev_instance);
66 } else {
67 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
68 }
69
70 return IRQ_HANDLED;
71}
72
73static struct ata_port_operations rb532_pata_port_ops = {
74 .inherits = &ata_sff_port_ops,
75 .sff_data_xfer = ata_sff_data_xfer32,
76};
77
78
79
80static struct scsi_host_template rb532_pata_sht = {
81 ATA_PIO_SHT(DRV_NAME),
82};
83
84
85
86static void rb532_pata_setup_ports(struct ata_host *ah)
87{
88 struct rb532_cf_info *info = ah->private_data;
89 struct ata_port *ap;
90
91 ap = ah->ports[0];
92
93 ap->ops = &rb532_pata_port_ops;
94 ap->pio_mask = ATA_PIO4;
95
96 ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE;
97 ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL;
98 ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
99
100 ata_sff_std_ports(&ap->ioaddr);
101
102 ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32;
103 ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR;
104}
105
106static int rb532_pata_driver_probe(struct platform_device *pdev)
107{
108 int irq;
109 int gpio;
110 struct resource *res;
111 struct ata_host *ah;
112 struct cf_device *pdata;
113 struct rb532_cf_info *info;
114 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
128 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;
135 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
147 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
148 if (!ah)
149 return -ENOMEM;
150
151 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
152 if (!info)
153 return -ENOMEM;
154
155 ah->private_data = info;
156 info->gpio_line = gpio;
157 info->irq = irq;
158
159 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
160 resource_size(res));
161 if (!info->iobase)
162 return -ENOMEM;
163
164 ret = gpio_direction_input(gpio);
165 if (ret) {
166 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
167 ret);
168 goto err_free_gpio;
169 }
170
171 rb532_pata_setup_ports(ah);
172
173 ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
174 IRQF_TRIGGER_LOW, &rb532_pata_sht);
175 if (ret)
176 goto err_free_gpio;
177
178 return 0;
179
180err_free_gpio:
181 gpio_free(gpio);
182
183 return ret;
184}
185
186static int rb532_pata_driver_remove(struct platform_device *pdev)
187{
188 struct ata_host *ah = platform_get_drvdata(pdev);
189 struct rb532_cf_info *info = ah->private_data;
190
191 ata_host_detach(ah);
192 gpio_free(info->gpio_line);
193
194 return 0;
195}
196
197static struct platform_driver rb532_pata_platform_driver = {
198 .probe = rb532_pata_driver_probe,
199 .remove = rb532_pata_driver_remove,
200 .driver = {
201 .name = DRV_NAME,
202 },
203};
204
205#define DRV_INFO DRV_DESC " version " DRV_VERSION
206
207module_platform_driver(rb532_pata_platform_driver);
208
209MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
210MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
211MODULE_DESCRIPTION(DRV_DESC);
212MODULE_VERSION(DRV_VERSION);
213MODULE_LICENSE("GPL");
214MODULE_ALIAS("platform:" DRV_NAME);
215
