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14#include <linux/device.h>
15#include <linux/gpio.h>
16#include <linux/string.h>
17#include <linux/slab.h>
18#include <linux/platform_device.h>
19#include <linux/export.h>
20#include <linux/io.h>
21#include <asm/hardware/scoop.h>
22
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30
31
32struct scoop_pcmcia_config *platform_scoop_config;
33EXPORT_SYMBOL(platform_scoop_config);
34
35struct scoop_dev {
36 void __iomem *base;
37 struct gpio_chip gpio;
38 spinlock_t scoop_lock;
39 unsigned short suspend_clr;
40 unsigned short suspend_set;
41 u32 scoop_gpwr;
42};
43
44void reset_scoop(struct device *dev)
45{
46 struct scoop_dev *sdev = dev_get_drvdata(dev);
47
48 iowrite16(0x0100, sdev->base + SCOOP_MCR);
49 iowrite16(0x0000, sdev->base + SCOOP_CDR);
50 iowrite16(0x0000, sdev->base + SCOOP_CCR);
51 iowrite16(0x0000, sdev->base + SCOOP_IMR);
52 iowrite16(0x00FF, sdev->base + SCOOP_IRM);
53 iowrite16(0x0000, sdev->base + SCOOP_ISR);
54 iowrite16(0x0000, sdev->base + SCOOP_IRM);
55}
56
57static void __scoop_gpio_set(struct scoop_dev *sdev,
58 unsigned offset, int value)
59{
60 unsigned short gpwr;
61
62 gpwr = ioread16(sdev->base + SCOOP_GPWR);
63 if (value)
64 gpwr |= 1 << (offset + 1);
65 else
66 gpwr &= ~(1 << (offset + 1));
67 iowrite16(gpwr, sdev->base + SCOOP_GPWR);
68}
69
70static void scoop_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
71{
72 struct scoop_dev *sdev = gpiochip_get_data(chip);
73 unsigned long flags;
74
75 spin_lock_irqsave(&sdev->scoop_lock, flags);
76
77 __scoop_gpio_set(sdev, offset, value);
78
79 spin_unlock_irqrestore(&sdev->scoop_lock, flags);
80}
81
82static int scoop_gpio_get(struct gpio_chip *chip, unsigned offset)
83{
84 struct scoop_dev *sdev = gpiochip_get_data(chip);
85
86
87 return !!(ioread16(sdev->base + SCOOP_GPRR) & (1 << (offset + 1)));
88}
89
90static int scoop_gpio_direction_input(struct gpio_chip *chip,
91 unsigned offset)
92{
93 struct scoop_dev *sdev = gpiochip_get_data(chip);
94 unsigned long flags;
95 unsigned short gpcr;
96
97 spin_lock_irqsave(&sdev->scoop_lock, flags);
98
99 gpcr = ioread16(sdev->base + SCOOP_GPCR);
100 gpcr &= ~(1 << (offset + 1));
101 iowrite16(gpcr, sdev->base + SCOOP_GPCR);
102
103 spin_unlock_irqrestore(&sdev->scoop_lock, flags);
104
105 return 0;
106}
107
108static int scoop_gpio_direction_output(struct gpio_chip *chip,
109 unsigned offset, int value)
110{
111 struct scoop_dev *sdev = gpiochip_get_data(chip);
112 unsigned long flags;
113 unsigned short gpcr;
114
115 spin_lock_irqsave(&sdev->scoop_lock, flags);
116
117 __scoop_gpio_set(sdev, offset, value);
118
119 gpcr = ioread16(sdev->base + SCOOP_GPCR);
120 gpcr |= 1 << (offset + 1);
121 iowrite16(gpcr, sdev->base + SCOOP_GPCR);
122
123 spin_unlock_irqrestore(&sdev->scoop_lock, flags);
124
125 return 0;
126}
127
128unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
129{
130 struct scoop_dev *sdev = dev_get_drvdata(dev);
131 return ioread16(sdev->base + reg);
132}
133
134void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
135{
136 struct scoop_dev *sdev = dev_get_drvdata(dev);
137 iowrite16(data, sdev->base + reg);
138}
139
140EXPORT_SYMBOL(reset_scoop);
141EXPORT_SYMBOL(read_scoop_reg);
142EXPORT_SYMBOL(write_scoop_reg);
143
144#ifdef CONFIG_PM
145static void check_scoop_reg(struct scoop_dev *sdev)
146{
147 unsigned short mcr;
148
149 mcr = ioread16(sdev->base + SCOOP_MCR);
150 if ((mcr & 0x100) == 0)
151 iowrite16(0x0101, sdev->base + SCOOP_MCR);
152}
153
154static int scoop_suspend(struct platform_device *dev, pm_message_t state)
155{
156 struct scoop_dev *sdev = platform_get_drvdata(dev);
157
158 check_scoop_reg(sdev);
159 sdev->scoop_gpwr = ioread16(sdev->base + SCOOP_GPWR);
160 iowrite16((sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set, sdev->base + SCOOP_GPWR);
161
162 return 0;
163}
164
165static int scoop_resume(struct platform_device *dev)
166{
167 struct scoop_dev *sdev = platform_get_drvdata(dev);
168
169 check_scoop_reg(sdev);
170 iowrite16(sdev->scoop_gpwr, sdev->base + SCOOP_GPWR);
171
172 return 0;
173}
174#else
175#define scoop_suspend NULL
176#define scoop_resume NULL
177#endif
178
179static int scoop_probe(struct platform_device *pdev)
180{
181 struct scoop_dev *devptr;
182 struct scoop_config *inf;
183 struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
184 int ret;
185
186 if (!mem)
187 return -EINVAL;
188
189 devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL);
190 if (!devptr)
191 return -ENOMEM;
192
193 spin_lock_init(&devptr->scoop_lock);
194
195 inf = pdev->dev.platform_data;
196 devptr->base = ioremap(mem->start, resource_size(mem));
197
198 if (!devptr->base) {
199 ret = -ENOMEM;
200 goto err_ioremap;
201 }
202
203 platform_set_drvdata(pdev, devptr);
204
205 printk("Sharp Scoop Device found at 0x%08x -> 0x%8p\n",(unsigned int)mem->start, devptr->base);
206
207 iowrite16(0x0140, devptr->base + SCOOP_MCR);
208 reset_scoop(&pdev->dev);
209 iowrite16(0x0000, devptr->base + SCOOP_CPR);
210 iowrite16(inf->io_dir & 0xffff, devptr->base + SCOOP_GPCR);
211 iowrite16(inf->io_out & 0xffff, devptr->base + SCOOP_GPWR);
212
213 devptr->suspend_clr = inf->suspend_clr;
214 devptr->suspend_set = inf->suspend_set;
215
216 devptr->gpio.base = -1;
217
218 if (inf->gpio_base != 0) {
219 devptr->gpio.label = dev_name(&pdev->dev);
220 devptr->gpio.base = inf->gpio_base;
221 devptr->gpio.ngpio = 12;
222 devptr->gpio.set = scoop_gpio_set;
223 devptr->gpio.get = scoop_gpio_get;
224 devptr->gpio.direction_input = scoop_gpio_direction_input;
225 devptr->gpio.direction_output = scoop_gpio_direction_output;
226
227 ret = gpiochip_add_data(&devptr->gpio, devptr);
228 if (ret)
229 goto err_gpio;
230 }
231
232 return 0;
233
234err_gpio:
235 platform_set_drvdata(pdev, NULL);
236err_ioremap:
237 iounmap(devptr->base);
238 kfree(devptr);
239
240 return ret;
241}
242
243static int scoop_remove(struct platform_device *pdev)
244{
245 struct scoop_dev *sdev = platform_get_drvdata(pdev);
246
247 if (!sdev)
248 return -EINVAL;
249
250 if (sdev->gpio.base != -1)
251 gpiochip_remove(&sdev->gpio);
252
253 platform_set_drvdata(pdev, NULL);
254 iounmap(sdev->base);
255 kfree(sdev);
256
257 return 0;
258}
259
260static struct platform_driver scoop_driver = {
261 .probe = scoop_probe,
262 .remove = scoop_remove,
263 .suspend = scoop_suspend,
264 .resume = scoop_resume,
265 .driver = {
266 .name = "sharp-scoop",
267 },
268};
269
270static int __init scoop_init(void)
271{
272 return platform_driver_register(&scoop_driver);
273}
274
275subsys_initcall(scoop_init);
276