2 * Support code for the SCOOP interface found on various Sharp PDAs
4 * Copyright (c) 2004 Richard Purdie
6 * Based on code written by Sharp/Lineo for 2.4 kernels
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.
14 #include <linux/device.h>
15 #include <linux/string.h>
16 #include <linux/slab.h>
17 #include <linux/platform_device.h>
20 #include <asm/hardware/scoop.h>
22 /* PCMCIA to Scoop linkage
24 There is no easy way to link multiple scoop devices into one
25 single entity for the pxa2xx_pcmcia device so this structure
26 is used which is setup by the platform code.
28 This file is never modular so this symbol is always
29 accessile to the board support files.
31 struct scoop_pcmcia_config *platform_scoop_config;
32 EXPORT_SYMBOL(platform_scoop_config);
36 struct gpio_chip gpio;
37 spinlock_t scoop_lock;
38 unsigned short suspend_clr;
39 unsigned short suspend_set;
43 void reset_scoop(struct device *dev)
45 struct scoop_dev *sdev = dev_get_drvdata(dev);
47 iowrite16(0x0100, sdev->base + SCOOP_MCR); // 00
48 iowrite16(0x0000, sdev->base + SCOOP_CDR); // 04
49 iowrite16(0x0000, sdev->base + SCOOP_CCR); // 10
50 iowrite16(0x0000, sdev->base + SCOOP_IMR); // 18
51 iowrite16(0x00FF, sdev->base + SCOOP_IRM); // 14
52 iowrite16(0x0000, sdev->base + SCOOP_ISR); // 1C
53 iowrite16(0x0000, sdev->base + SCOOP_IRM);
56 static void __scoop_gpio_set(struct scoop_dev *sdev,
57 unsigned offset, int value)
61 gpwr = ioread16(sdev->base + SCOOP_GPWR);
63 gpwr |= 1 << (offset + 1);
65 gpwr &= ~(1 << (offset + 1));
66 iowrite16(gpwr, sdev->base + SCOOP_GPWR);
69 static void scoop_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
71 struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
74 spin_lock_irqsave(&sdev->scoop_lock, flags);
76 __scoop_gpio_set(sdev, offset, value);
78 spin_unlock_irqrestore(&sdev->scoop_lock, flags);
81 static int scoop_gpio_get(struct gpio_chip *chip, unsigned offset)
83 struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
85 /* XXX: I'm usure, but it seems so */
86 return ioread16(sdev->base + SCOOP_GPRR) & (1 << (offset + 1));
89 static int scoop_gpio_direction_input(struct gpio_chip *chip,
92 struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
96 spin_lock_irqsave(&sdev->scoop_lock, flags);
98 gpcr = ioread16(sdev->base + SCOOP_GPCR);
99 gpcr &= ~(1 << (offset + 1));
100 iowrite16(gpcr, sdev->base + SCOOP_GPCR);
102 spin_unlock_irqrestore(&sdev->scoop_lock, flags);
107 static int scoop_gpio_direction_output(struct gpio_chip *chip,
108 unsigned offset, int value)
110 struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
114 spin_lock_irqsave(&sdev->scoop_lock, flags);
116 __scoop_gpio_set(sdev, offset, value);
118 gpcr = ioread16(sdev->base + SCOOP_GPCR);
119 gpcr |= 1 << (offset + 1);
120 iowrite16(gpcr, sdev->base + SCOOP_GPCR);
122 spin_unlock_irqrestore(&sdev->scoop_lock, flags);
127 unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
129 struct scoop_dev *sdev = dev_get_drvdata(dev);
130 return ioread16(sdev->base + reg);
133 void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
135 struct scoop_dev *sdev = dev_get_drvdata(dev);
136 iowrite16(data, sdev->base + reg);
139 EXPORT_SYMBOL(reset_scoop);
140 EXPORT_SYMBOL(read_scoop_reg);
141 EXPORT_SYMBOL(write_scoop_reg);
143 static void check_scoop_reg(struct scoop_dev *sdev)
147 mcr = ioread16(sdev->base + SCOOP_MCR);
148 if ((mcr & 0x100) == 0)
149 iowrite16(0x0101, sdev->base + SCOOP_MCR);
153 static int scoop_suspend(struct platform_device *dev, pm_message_t state)
155 struct scoop_dev *sdev = platform_get_drvdata(dev);
157 check_scoop_reg(sdev);
158 sdev->scoop_gpwr = ioread16(sdev->base + SCOOP_GPWR);
159 iowrite16((sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set, sdev->base + SCOOP_GPWR);
164 static int scoop_resume(struct platform_device *dev)
166 struct scoop_dev *sdev = platform_get_drvdata(dev);
168 check_scoop_reg(sdev);
169 iowrite16(sdev->scoop_gpwr, sdev->base + SCOOP_GPWR);
174 #define scoop_suspend NULL
175 #define scoop_resume NULL
178 static int __devinit scoop_probe(struct platform_device *pdev)
180 struct scoop_dev *devptr;
181 struct scoop_config *inf;
182 struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
189 devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL);
193 spin_lock_init(&devptr->scoop_lock);
195 inf = pdev->dev.platform_data;
196 devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
203 platform_set_drvdata(pdev, devptr);
205 printk("Sharp Scoop Device found at 0x%08x -> 0x%8p\n",(unsigned int)mem->start, devptr->base);
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);
213 devptr->suspend_clr = inf->suspend_clr;
214 devptr->suspend_set = inf->suspend_set;
216 devptr->gpio.base = -1;
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;
227 ret = gpiochip_add(&devptr->gpio);
234 if (devptr->gpio.base != -1)
235 temp = gpiochip_remove(&devptr->gpio);
237 platform_set_drvdata(pdev, NULL);
239 iounmap(devptr->base);
245 static int __devexit scoop_remove(struct platform_device *pdev)
247 struct scoop_dev *sdev = platform_get_drvdata(pdev);
253 if (sdev->gpio.base != -1) {
254 ret = gpiochip_remove(&sdev->gpio);
256 dev_err(&pdev->dev, "Can't remove gpio chip: %d\n", ret);
261 platform_set_drvdata(pdev, NULL);
268 static struct platform_driver scoop_driver = {
269 .probe = scoop_probe,
270 .remove = __devexit_p(scoop_remove),
271 .suspend = scoop_suspend,
272 .resume = scoop_resume,
274 .name = "sharp-scoop",
278 static int __init scoop_init(void)
280 return platform_driver_register(&scoop_driver);
283 subsys_initcall(scoop_init);