This source file includes following definitions.
- reset_scoop
- __scoop_gpio_set
- scoop_gpio_set
- scoop_gpio_get
- scoop_gpio_direction_input
- scoop_gpio_direction_output
- read_scoop_reg
- write_scoop_reg
- check_scoop_reg
- scoop_suspend
- scoop_resume
- scoop_probe
- scoop_remove
- scoop_init
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10 #include <linux/device.h>
11 #include <linux/gpio/driver.h>
12 #include <linux/string.h>
13 #include <linux/slab.h>
14 #include <linux/platform_device.h>
15 #include <linux/export.h>
16 #include <linux/io.h>
17 #include <asm/hardware/scoop.h>
18
19
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26
27
28 struct scoop_pcmcia_config *platform_scoop_config;
29 EXPORT_SYMBOL(platform_scoop_config);
30
31 struct scoop_dev {
32 void __iomem *base;
33 struct gpio_chip gpio;
34 spinlock_t scoop_lock;
35 unsigned short suspend_clr;
36 unsigned short suspend_set;
37 u32 scoop_gpwr;
38 };
39
40 void reset_scoop(struct device *dev)
41 {
42 struct scoop_dev *sdev = dev_get_drvdata(dev);
43
44 iowrite16(0x0100, sdev->base + SCOOP_MCR);
45 iowrite16(0x0000, sdev->base + SCOOP_CDR);
46 iowrite16(0x0000, sdev->base + SCOOP_CCR);
47 iowrite16(0x0000, sdev->base + SCOOP_IMR);
48 iowrite16(0x00FF, sdev->base + SCOOP_IRM);
49 iowrite16(0x0000, sdev->base + SCOOP_ISR);
50 iowrite16(0x0000, sdev->base + SCOOP_IRM);
51 }
52
53 static void __scoop_gpio_set(struct scoop_dev *sdev,
54 unsigned offset, int value)
55 {
56 unsigned short gpwr;
57
58 gpwr = ioread16(sdev->base + SCOOP_GPWR);
59 if (value)
60 gpwr |= 1 << (offset + 1);
61 else
62 gpwr &= ~(1 << (offset + 1));
63 iowrite16(gpwr, sdev->base + SCOOP_GPWR);
64 }
65
66 static void scoop_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
67 {
68 struct scoop_dev *sdev = gpiochip_get_data(chip);
69 unsigned long flags;
70
71 spin_lock_irqsave(&sdev->scoop_lock, flags);
72
73 __scoop_gpio_set(sdev, offset, value);
74
75 spin_unlock_irqrestore(&sdev->scoop_lock, flags);
76 }
77
78 static int scoop_gpio_get(struct gpio_chip *chip, unsigned offset)
79 {
80 struct scoop_dev *sdev = gpiochip_get_data(chip);
81
82
83 return !!(ioread16(sdev->base + SCOOP_GPRR) & (1 << (offset + 1)));
84 }
85
86 static int scoop_gpio_direction_input(struct gpio_chip *chip,
87 unsigned offset)
88 {
89 struct scoop_dev *sdev = gpiochip_get_data(chip);
90 unsigned long flags;
91 unsigned short gpcr;
92
93 spin_lock_irqsave(&sdev->scoop_lock, flags);
94
95 gpcr = ioread16(sdev->base + SCOOP_GPCR);
96 gpcr &= ~(1 << (offset + 1));
97 iowrite16(gpcr, sdev->base + SCOOP_GPCR);
98
99 spin_unlock_irqrestore(&sdev->scoop_lock, flags);
100
101 return 0;
102 }
103
104 static int scoop_gpio_direction_output(struct gpio_chip *chip,
105 unsigned offset, int value)
106 {
107 struct scoop_dev *sdev = gpiochip_get_data(chip);
108 unsigned long flags;
109 unsigned short gpcr;
110
111 spin_lock_irqsave(&sdev->scoop_lock, flags);
112
113 __scoop_gpio_set(sdev, offset, value);
114
115 gpcr = ioread16(sdev->base + SCOOP_GPCR);
116 gpcr |= 1 << (offset + 1);
117 iowrite16(gpcr, sdev->base + SCOOP_GPCR);
118
119 spin_unlock_irqrestore(&sdev->scoop_lock, flags);
120
121 return 0;
122 }
123
124 unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
125 {
126 struct scoop_dev *sdev = dev_get_drvdata(dev);
127 return ioread16(sdev->base + reg);
128 }
129
130 void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
131 {
132 struct scoop_dev *sdev = dev_get_drvdata(dev);
133 iowrite16(data, sdev->base + reg);
134 }
135
136 EXPORT_SYMBOL(reset_scoop);
137 EXPORT_SYMBOL(read_scoop_reg);
138 EXPORT_SYMBOL(write_scoop_reg);
139
140 #ifdef CONFIG_PM
141 static void check_scoop_reg(struct scoop_dev *sdev)
142 {
143 unsigned short mcr;
144
145 mcr = ioread16(sdev->base + SCOOP_MCR);
146 if ((mcr & 0x100) == 0)
147 iowrite16(0x0101, sdev->base + SCOOP_MCR);
148 }
149
150 static int scoop_suspend(struct platform_device *dev, pm_message_t state)
151 {
152 struct scoop_dev *sdev = platform_get_drvdata(dev);
153
154 check_scoop_reg(sdev);
155 sdev->scoop_gpwr = ioread16(sdev->base + SCOOP_GPWR);
156 iowrite16((sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set, sdev->base + SCOOP_GPWR);
157
158 return 0;
159 }
160
161 static int scoop_resume(struct platform_device *dev)
162 {
163 struct scoop_dev *sdev = platform_get_drvdata(dev);
164
165 check_scoop_reg(sdev);
166 iowrite16(sdev->scoop_gpwr, sdev->base + SCOOP_GPWR);
167
168 return 0;
169 }
170 #else
171 #define scoop_suspend NULL
172 #define scoop_resume NULL
173 #endif
174
175 static int scoop_probe(struct platform_device *pdev)
176 {
177 struct scoop_dev *devptr;
178 struct scoop_config *inf;
179 struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
180 int ret;
181
182 if (!mem)
183 return -EINVAL;
184
185 devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL);
186 if (!devptr)
187 return -ENOMEM;
188
189 spin_lock_init(&devptr->scoop_lock);
190
191 inf = pdev->dev.platform_data;
192 devptr->base = ioremap(mem->start, resource_size(mem));
193
194 if (!devptr->base) {
195 ret = -ENOMEM;
196 goto err_ioremap;
197 }
198
199 platform_set_drvdata(pdev, devptr);
200
201 printk("Sharp Scoop Device found at 0x%08x -> 0x%8p\n",(unsigned int)mem->start, devptr->base);
202
203 iowrite16(0x0140, devptr->base + SCOOP_MCR);
204 reset_scoop(&pdev->dev);
205 iowrite16(0x0000, devptr->base + SCOOP_CPR);
206 iowrite16(inf->io_dir & 0xffff, devptr->base + SCOOP_GPCR);
207 iowrite16(inf->io_out & 0xffff, devptr->base + SCOOP_GPWR);
208
209 devptr->suspend_clr = inf->suspend_clr;
210 devptr->suspend_set = inf->suspend_set;
211
212 devptr->gpio.base = -1;
213
214 if (inf->gpio_base != 0) {
215 devptr->gpio.label = dev_name(&pdev->dev);
216 devptr->gpio.base = inf->gpio_base;
217 devptr->gpio.ngpio = 12;
218 devptr->gpio.set = scoop_gpio_set;
219 devptr->gpio.get = scoop_gpio_get;
220 devptr->gpio.direction_input = scoop_gpio_direction_input;
221 devptr->gpio.direction_output = scoop_gpio_direction_output;
222
223 ret = gpiochip_add_data(&devptr->gpio, devptr);
224 if (ret)
225 goto err_gpio;
226 }
227
228 return 0;
229
230 err_gpio:
231 platform_set_drvdata(pdev, NULL);
232 err_ioremap:
233 iounmap(devptr->base);
234 kfree(devptr);
235
236 return ret;
237 }
238
239 static int scoop_remove(struct platform_device *pdev)
240 {
241 struct scoop_dev *sdev = platform_get_drvdata(pdev);
242
243 if (!sdev)
244 return -EINVAL;
245
246 if (sdev->gpio.base != -1)
247 gpiochip_remove(&sdev->gpio);
248
249 platform_set_drvdata(pdev, NULL);
250 iounmap(sdev->base);
251 kfree(sdev);
252
253 return 0;
254 }
255
256 static struct platform_driver scoop_driver = {
257 .probe = scoop_probe,
258 .remove = scoop_remove,
259 .suspend = scoop_suspend,
260 .resume = scoop_resume,
261 .driver = {
262 .name = "sharp-scoop",
263 },
264 };
265
266 static int __init scoop_init(void)
267 {
268 return platform_driver_register(&scoop_driver);
269 }
270
271 subsys_initcall(scoop_init);