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 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 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 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 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 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 } 107 108 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 } 127 128 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 } 133 134 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 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 } 153 154 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 } 164 165 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 178 179 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 int temp; 186 187 if (!mem) 188 return -EINVAL; 189 190 devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL); 191 if (!devptr) 192 return -ENOMEM; 193 194 spin_lock_init(&devptr->scoop_lock); 195 196 inf = pdev->dev.platform_data; 197 devptr->base = ioremap(mem->start, resource_size(mem)); 198 199 if (!devptr->base) { 200 ret = -ENOMEM; 201 goto err_ioremap; 202 } 203 204 platform_set_drvdata(pdev, devptr); 205 206 printk("Sharp Scoop Device found at 0x%08x -> 0x%8p\n",(unsigned int)mem->start, devptr->base); 207 208 iowrite16(0x0140, devptr->base + SCOOP_MCR); 209 reset_scoop(&pdev->dev); 210 iowrite16(0x0000, devptr->base + SCOOP_CPR); 211 iowrite16(inf->io_dir & 0xffff, devptr->base + SCOOP_GPCR); 212 iowrite16(inf->io_out & 0xffff, devptr->base + SCOOP_GPWR); 213 214 devptr->suspend_clr = inf->suspend_clr; 215 devptr->suspend_set = inf->suspend_set; 216 217 devptr->gpio.base = -1; 218 219 if (inf->gpio_base != 0) { 220 devptr->gpio.label = dev_name(&pdev->dev); 221 devptr->gpio.base = inf->gpio_base; 222 devptr->gpio.ngpio = 12; /* PA11 = 0, PA12 = 1, etc. up to PA22 = 11 */ 223 devptr->gpio.set = scoop_gpio_set; 224 devptr->gpio.get = scoop_gpio_get; 225 devptr->gpio.direction_input = scoop_gpio_direction_input; 226 devptr->gpio.direction_output = scoop_gpio_direction_output; 227 228 ret = gpiochip_add(&devptr->gpio); 229 if (ret) 230 goto err_gpio; 231 } 232 233 return 0; 234 235 if (devptr->gpio.base != -1) 236 temp = gpiochip_remove(&devptr->gpio); 237 err_gpio: 238 platform_set_drvdata(pdev, NULL); 239 err_ioremap: 240 iounmap(devptr->base); 241 kfree(devptr); 242 243 return ret; 244 } 245 246 static int scoop_remove(struct platform_device *pdev) 247 { 248 struct scoop_dev *sdev = platform_get_drvdata(pdev); 249 int ret; 250 251 if (!sdev) 252 return -EINVAL; 253 254 if (sdev->gpio.base != -1) { 255 ret = gpiochip_remove(&sdev->gpio); 256 if (ret) { 257 dev_err(&pdev->dev, "Can't remove gpio chip: %d\n", ret); 258 return ret; 259 } 260 } 261 262 platform_set_drvdata(pdev, NULL); 263 iounmap(sdev->base); 264 kfree(sdev); 265 266 return 0; 267 } 268 269 static struct platform_driver scoop_driver = { 270 .probe = scoop_probe, 271 .remove = scoop_remove, 272 .suspend = scoop_suspend, 273 .resume = scoop_resume, 274 .driver = { 275 .name = "sharp-scoop", 276 }, 277 }; 278 279 static int __init scoop_init(void) 280 { 281 return platform_driver_register(&scoop_driver); 282 } 283 284 subsys_initcall(scoop_init); 285