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*/ 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); /* 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 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 = 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 82static 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 90static 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 108static 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 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; /* 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 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