target/linux/ifxmips/files/arch/mips/ifxmips/gpio.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  15  *
  16  *   Copyright (C) 2004 btxu Generate from INCA-IP project
  17  *   Copyright (C) 2005 Jin-Sze.Sow Comments edited
  18  *   Copyright (C) 2006 Huang Xiaogang Modification & verification on Danube chip
  19  *   Copyright (C) 2007 John Crispin <blogic@openwrt.org>
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/types.h>
  24 #include <linux/errno.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/init.h>
  27 #include <linux/ioctl.h>
  28 #include <linux/timer.h>
  29 #include <linux/module.h>
  30 #include <linux/timer.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/kobject.h>
  33 #include <linux/workqueue.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/netlink.h>
  36 #include <linux/platform_device.h>
  37 #include <linux/uaccess.h>
  38 #include <linux/semaphore.h>
  39 #include <linux/gpio.h>
  40
  41 #include <net/sock.h>
  42
  43 #include <ifxmips.h>
  44
  45 #define MAX_PORTS                       2
  46 #define PINS_PER_PORT           16
  47
  48 #define IFXMIPS_GPIO_SANITY             {if (port > MAX_PORTS || pin > PINS_PER_PORT) return -EINVAL; }
  49
  50 #define GPIO_TO_PORT(x) ((x > 15) ? (1) : (0))
  51 #define GPIO_TO_GPIO(x) ((x > 15) ? (x - 16) : (x))
  52
  53 int
  54 ifxmips_port_reserve_pin(unsigned int port, unsigned int pin)
  55 {
  56         IFXMIPS_GPIO_SANITY;
  57         printk(KERN_INFO "%s : call to obseleted function\n", __func__);
  58         return 0;
  59 }
  60 EXPORT_SYMBOL(ifxmips_port_reserve_pin);
  61
  62 int
  63 ifxmips_port_free_pin(unsigned int port, unsigned int pin)
  64 {
  65         IFXMIPS_GPIO_SANITY;
  66         printk(KERN_INFO "%s : call to obseleted function\n", __func__);
  67         return 0;
  68 }
  69 EXPORT_SYMBOL(ifxmips_port_free_pin);
  70
  71 int
  72 ifxmips_port_set_open_drain(unsigned int port, unsigned int pin)
  73 {
  74         IFXMIPS_GPIO_SANITY;
  75         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD + (port * 0xC)) | (1 << pin),
  76                 IFXMIPS_GPIO_P0_OD + (port * 0xC));
  77         return 0;
  78 }
  79 EXPORT_SYMBOL(ifxmips_port_set_open_drain);
  80
  81 int
  82 ifxmips_port_clear_open_drain(unsigned int port, unsigned int pin)
  83 {
  84         IFXMIPS_GPIO_SANITY;
  85         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD + (port * 0xC)) & ~(1 << pin),
  86                 IFXMIPS_GPIO_P0_OD + (port * 0xC));
  87         return 0;
  88 }
  89 EXPORT_SYMBOL(ifxmips_port_clear_open_drain);
  90
  91 int
  92 ifxmips_port_set_pudsel(unsigned int port, unsigned int pin)
  93 {
  94         IFXMIPS_GPIO_SANITY;
  95         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) | (1 << pin),
  96                 IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
  97         return 0;
  98 }
  99 EXPORT_SYMBOL(ifxmips_port_set_pudsel);
 100
 101 int
 102 ifxmips_port_clear_pudsel(unsigned int port, unsigned int pin)
 103 {
 104         IFXMIPS_GPIO_SANITY;
 105         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) & ~(1 << pin),
 106                 IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
 107         return 0;
 108 }
 109 EXPORT_SYMBOL(ifxmips_port_clear_pudsel);
 110
 111 int
 112 ifxmips_port_set_puden(unsigned int port, unsigned int pin)
 113 {
 114         IFXMIPS_GPIO_SANITY;
 115         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) | (1 << pin),
 116                 IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
 117         return 0;
 118 }
 119 EXPORT_SYMBOL(ifxmips_port_set_puden);
 120
 121 int
 122 ifxmips_port_clear_puden(unsigned int port, unsigned int pin)
 123 {
 124         IFXMIPS_GPIO_SANITY;
 125         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) & ~(1 << pin),
 126                 IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
 127         return 0;
 128 }
 129 EXPORT_SYMBOL(ifxmips_port_clear_puden);
 130
 131 int
 132 ifxmips_port_set_stoff(unsigned int port, unsigned int pin)
 133 {
 134         IFXMIPS_GPIO_SANITY;
 135         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) | (1 << pin),
 136                 IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
 137         return 0;
 138 }
 139 EXPORT_SYMBOL(ifxmips_port_set_stoff);
 140
 141 int
 142 ifxmips_port_clear_stoff(unsigned int port, unsigned int pin)
 143 {
 144         IFXMIPS_GPIO_SANITY;
 145         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) & ~(1 << pin),
 146                 IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
 147         return 0;
 148 }
 149 EXPORT_SYMBOL(ifxmips_port_clear_stoff);
 150
 151 int
 152 ifxmips_port_set_dir_out(unsigned int port, unsigned int pin)
 153 {
 154         IFXMIPS_GPIO_SANITY;
 155         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) | (1 << pin),
 156                 IFXMIPS_GPIO_P0_DIR + (port * 0xC));
 157         return 0;
 158 }
 159 EXPORT_SYMBOL(ifxmips_port_set_dir_out);
 160
 161 int
 162 ifxmips_port_set_dir_in(unsigned int port, unsigned int pin)
 163 {
 164         IFXMIPS_GPIO_SANITY;
 165         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) & ~(1 << pin),
 166                 IFXMIPS_GPIO_P0_DIR + (port * 0xC));
 167         return 0;
 168 }
 169 EXPORT_SYMBOL(ifxmips_port_set_dir_in);
 170
 171 int
 172 ifxmips_port_set_output(unsigned int port, unsigned int pin)
 173 {
 174         IFXMIPS_GPIO_SANITY;
 175         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) | (1 << pin),
 176                 IFXMIPS_GPIO_P0_OUT + (port * 0xC));
 177         return 0;
 178 }
 179 EXPORT_SYMBOL(ifxmips_port_set_output);
 180
 181 int
 182 ifxmips_port_clear_output(unsigned int port, unsigned int pin)
 183 {
 184         IFXMIPS_GPIO_SANITY;
 185         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) & ~(1 << pin),
 186                 IFXMIPS_GPIO_P0_OUT + (port * 0xC));
 187         return 0;
 188 }
 189 EXPORT_SYMBOL(ifxmips_port_clear_output);
 190
 191 int
 192 ifxmips_port_get_input(unsigned int port, unsigned int pin)
 193 {
 194         IFXMIPS_GPIO_SANITY;
 195         if (ifxmips_r32(IFXMIPS_GPIO_P0_IN + (port * 0xC)) & (1 << pin))
 196                 return 0;
 197         else
 198                 return 1;
 199 }
 200 EXPORT_SYMBOL(ifxmips_port_get_input);
 201
 202 int
 203 ifxmips_port_set_altsel0(unsigned int port, unsigned int pin)
 204 {
 205         IFXMIPS_GPIO_SANITY;
 206         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) | (1 << pin),
 207                 IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
 208         return 0;
 209 }
 210 EXPORT_SYMBOL(ifxmips_port_set_altsel0);
 211
 212 int
 213 ifxmips_port_clear_altsel0(unsigned int port, unsigned int pin)
 214 {
 215         IFXMIPS_GPIO_SANITY;
 216         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) & ~(1 << pin),
 217                 IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
 218         return 0;
 219 }
 220 EXPORT_SYMBOL(ifxmips_port_clear_altsel0);
 221
 222 int
 223 ifxmips_port_set_altsel1(unsigned int port, unsigned int pin)
 224 {
 225         IFXMIPS_GPIO_SANITY;
 226         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) | (1 << pin),
 227                 IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
 228         return 0;
 229 }
 230 EXPORT_SYMBOL(ifxmips_port_set_altsel1);
 231
 232 int
 233 ifxmips_port_clear_altsel1(unsigned int port, unsigned int pin)
 234 {
 235         IFXMIPS_GPIO_SANITY;
 236         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) & ~(1 << pin),
 237                 IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
 238         return 0;
 239 }
 240 EXPORT_SYMBOL(ifxmips_port_clear_altsel1);
 241
 242 static void
 243 ifxmips_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
 244 {
 245         int port = GPIO_TO_PORT(offset);
 246         int gpio = GPIO_TO_GPIO(offset);
 247         if(value)
 248                 ifxmips_port_set_output(port, gpio);
 249         else
 250                 ifxmips_port_clear_output(port, gpio);
 251 }
 252
 253 static int
 254 ifxmips_gpio_get(struct gpio_chip *chip, unsigned int offset)
 255 {
 256         int port = GPIO_TO_PORT(offset);
 257         int gpio = GPIO_TO_GPIO(offset);
 258         return ifxmips_port_get_input(port, gpio);
 259 }
 260
 261 static int
 262 ifxmips_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
 263 {
 264         int port = GPIO_TO_PORT(offset);
 265         int gpio = GPIO_TO_GPIO(offset);
 266         ifxmips_port_set_open_drain(port, gpio);
 267         ifxmips_port_clear_altsel0(port, gpio);
 268         ifxmips_port_clear_altsel1(port, gpio);
 269         ifxmips_port_set_dir_in(port, gpio);
 270         return 0;
 271 }
 272
 273 static int
 274 ifxmips_gpio_direction_output(struct gpio_chip *chip, unsigned int offset, int value)
 275 {
 276         int port = GPIO_TO_PORT(offset);
 277         int gpio = GPIO_TO_GPIO(offset);
 278         ifxmips_port_clear_open_drain(port, gpio);
 279         ifxmips_port_clear_altsel0(port, gpio);
 280         ifxmips_port_clear_altsel1(port, gpio);
 281         ifxmips_port_set_dir_out(port, gpio);
 282         ifxmips_gpio_set(chip, offset, value);
 283         return 0;
 284 }
 285
 286 int
 287 gpio_to_irq(unsigned int gpio)
 288 {
 289         return -EINVAL;
 290 }
 291 EXPORT_SYMBOL(gpio_to_irq);
 292
 293 struct gpio_chip
 294 ifxmips_gpio_chip =
 295 {
 296         .label = "ifxmips-gpio",
 297         .direction_input = ifxmips_gpio_direction_input,
 298         .direction_output = ifxmips_gpio_direction_output,
 299         .get = ifxmips_gpio_get,
 300         .set = ifxmips_gpio_set,
 301         .base = 0,
 302         .ngpio = 32,
 303 };
 304
 305 static int
 306 ifxmips_gpio_probe(struct platform_device *dev)
 307 {
 308         gpiochip_add(&ifxmips_gpio_chip);
 309         return 0;
 310 }
 311
 312 static int
 313 ifxmips_gpio_remove(struct platform_device *pdev)
 314 {
 315         gpiochip_remove(&ifxmips_gpio_chip);
 316         return 0;
 317 }
 318
 319 static struct platform_driver
 320 ifxmips_gpio_driver = {
 321         .probe = ifxmips_gpio_probe,
 322         .remove = ifxmips_gpio_remove,
 323         .driver = {
 324                 .name = "ifxmips_gpio",
 325                 .owner = THIS_MODULE,
 326         },
 327 };
 328
 329 int __init
 330 ifxmips_gpio_init(void)
 331 {
 332         int ret = platform_driver_register(&ifxmips_gpio_driver);
 333         if (ret)
 334                 printk(KERN_INFO "ifxmips_gpio : Error registering platfom driver!");
 335         return ret;
 336 }
 337
 338 void __exit
 339 ifxmips_gpio_exit(void)
 340 {
 341         platform_driver_unregister(&ifxmips_gpio_driver);
 342 }
 343
 344 module_init(ifxmips_gpio_init);
 345 module_exit(ifxmips_gpio_exit);