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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
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 set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
64 ata_sff_interrupt(info->irq, dev_instance);
65 } else {
66 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 ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;
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 __devinit 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 rb532_cf_info *info;
113 int ret;
114
115 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
116 if (!res) {
117 dev_err(&pdev->dev, "no IOMEM resource found\n");
118 return -EINVAL;
119 }
120
121 irq = platform_get_irq(pdev, 0);
122 if (irq <= 0) {
123 dev_err(&pdev->dev, "no IRQ resource found\n");
124 return -ENOENT;
125 }
126
127 gpio = irq_to_gpio(irq);
128 if (gpio < 0) {
129 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
130 return -ENOENT;
131 }
132
133 ret = gpio_request(gpio, DRV_NAME);
134 if (ret) {
135 dev_err(&pdev->dev, "GPIO request failed\n");
136 return ret;
137 }
138
139
140 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
141 if (!ah)
142 return -ENOMEM;
143
144 platform_set_drvdata(pdev, ah);
145
146 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
147 if (!info)
148 return -ENOMEM;
149
150 ah->private_data = info;
151 info->gpio_line = gpio;
152 info->irq = irq;
153
154 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
155 resource_size(res));
156 if (!info->iobase)
157 return -ENOMEM;
158
159 ret = gpio_direction_input(gpio);
160 if (ret) {
161 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
162 ret);
163 goto err_free_gpio;
164 }
165
166 rb532_pata_setup_ports(ah);
167
168 ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
169 IRQF_TRIGGER_LOW, &rb532_pata_sht);
170 if (ret)
171 goto err_free_gpio;
172
173 return 0;
174
175err_free_gpio:
176 gpio_free(gpio);
177
178 return ret;
179}
180
181static __devexit int rb532_pata_driver_remove(struct platform_device *pdev)
182{
183 struct ata_host *ah = platform_get_drvdata(pdev);
184 struct rb532_cf_info *info = ah->private_data;
185
186 ata_host_detach(ah);
187 gpio_free(info->gpio_line);
188
189 return 0;
190}
191
192
193MODULE_ALIAS("platform:" DRV_NAME);
194
195static struct platform_driver rb532_pata_platform_driver = {
196 .probe = rb532_pata_driver_probe,
197 .remove = __devexit_p(rb532_pata_driver_remove),
198 .driver = {
199 .name = DRV_NAME,
200 .owner = THIS_MODULE,
201 },
202};
203
204
205
206#define DRV_INFO DRV_DESC " version " DRV_VERSION
207
208static int __init rb532_pata_module_init(void)
209{
210 printk(KERN_INFO DRV_INFO "\n");
211
212 return platform_driver_register(&rb532_pata_platform_driver);
213}
214
215static void __exit rb532_pata_module_exit(void)
216{
217 platform_driver_unregister(&rb532_pata_platform_driver);
218}
219
220MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
221MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
222MODULE_DESCRIPTION(DRV_DESC);
223MODULE_VERSION(DRV_VERSION);
224MODULE_LICENSE("GPL");
225
226module_init(rb532_pata_module_init);
227module_exit(rb532_pata_module_exit);
228
