1 /*
2 * Support code for the SCOOP interface found on various Sharp PDAs
3 *
4 * Copyright (c) 2004 Richard Purdie
5 *
6 * Based on code written by Sharp/Lineo for 2.4 kernels
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 */
13
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
23 /* PCMCIA to Scoop linkage
24
25 There is no easy way to link multiple scoop devices into one
26 single entity for the pxa2xx_pcmcia device so this structure
27 is used which is setup by the platform code.
28
29 This file is never modular so this symbol is always
30 accessile to the board support files.
31 */
32 struct scoop_pcmcia_config *platform_scoop_config;
33 EXPORT_SYMBOL(platform_scoop_config);
34
35 struct 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
reset_scoop(struct device * dev)44 void reset_scoop(struct device *dev)
45 {
46 struct scoop_dev *sdev = dev_get_drvdata(dev);
47
48 iowrite16(0x0100, sdev->base + SCOOP_MCR); /* 00 */
49 iowrite16(0x0000, sdev->base + SCOOP_CDR); /* 04 */
50 iowrite16(0x0000, sdev->base + SCOOP_CCR); /* 10 */
51 iowrite16(0x0000, sdev->base + SCOOP_IMR); /* 18 */
52 iowrite16(0x00FF, sdev->base + SCOOP_IRM); /* 14 */
53 iowrite16(0x0000, sdev->base + SCOOP_ISR); /* 1C */
54 iowrite16(0x0000, sdev->base + SCOOP_IRM);
55 }
56
__scoop_gpio_set(struct scoop_dev * sdev,unsigned offset,int value)57 static 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
scoop_gpio_set(struct gpio_chip * chip,unsigned offset,int value)70 static void scoop_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
71 {
72 struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
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
scoop_gpio_get(struct gpio_chip * chip,unsigned offset)82 static int scoop_gpio_get(struct gpio_chip *chip, unsigned offset)
83 {
84 struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
85
86 /* XXX: I'm unsure, but it seems so */
87 return ioread16(sdev->base + SCOOP_GPRR) & (1 << (offset + 1));
88 }
89
scoop_gpio_direction_input(struct gpio_chip * chip,unsigned offset)90 static int scoop_gpio_direction_input(struct gpio_chip *chip,
91 unsigned offset)
92 {
93 struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
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
scoop_gpio_direction_output(struct gpio_chip * chip,unsigned offset,int value)108 static int scoop_gpio_direction_output(struct gpio_chip *chip,
109 unsigned offset, int value)
110 {
111 struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
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
read_scoop_reg(struct device * dev,unsigned short reg)128 unsigned 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
write_scoop_reg(struct device * dev,unsigned short reg,unsigned short data)134 void 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
140 EXPORT_SYMBOL(reset_scoop);
141 EXPORT_SYMBOL(read_scoop_reg);
142 EXPORT_SYMBOL(write_scoop_reg);
143
144 #ifdef CONFIG_PM
check_scoop_reg(struct scoop_dev * sdev)145 static 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
scoop_suspend(struct platform_device * dev,pm_message_t state)154 static 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
scoop_resume(struct platform_device * dev)165 static 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
scoop_probe(struct platform_device * pdev)179 static 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; /* PA11 = 0, PA12 = 1, etc. up to PA22 = 11 */
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(&devptr->gpio);
228 if (ret)
229 goto err_gpio;
230 }
231
232 return 0;
233
234 err_gpio:
235 platform_set_drvdata(pdev, NULL);
236 err_ioremap:
237 iounmap(devptr->base);
238 kfree(devptr);
239
240 return ret;
241 }
242
scoop_remove(struct platform_device * pdev)243 static 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
260 static 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
scoop_init(void)270 static int __init scoop_init(void)
271 {
272 return platform_driver_register(&scoop_driver);
273 }
274
275 subsys_initcall(scoop_init);
276