target/linux/ifxmips/files/drivers/char/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) 2005 infineon
  17  *   Copyright (C) 2007 John Crispin <blogic@openwrt.org>
  18  *
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/errno.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/init.h>
  26 #include <linux/ioctl.h>
  27 #include <asm/semaphore.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/ifxmips/ifxmips.h>
  30 #include <asm/ifxmips/ifxmips_ioctl.h>
  31
  32 #define MAX_PORTS                       2
  33 #define PINS_PER_PORT           16
  34
  35 static unsigned int ifxmips_gpio_major = 0;
  36
  37 /* TODO do we need this ? */
  38 static struct semaphore port_sem;
  39
  40 /* TODO do we really need this ? return in a define is forbidden by coding style */
  41 #define IFXMIPS_GPIO_SANITY             {if (port > MAX_PORTS || pin > PINS_PER_PORT) return -EINVAL; }
  42
  43 int
  44 ifxmips_port_reserve_pin (unsigned int port, unsigned int pin)
  45 {
  46         IFXMIPS_GPIO_SANITY;
  47         printk("%s : call to obseleted function\n", __func__);
  48
  49         return 0;
  50 }
  51 EXPORT_SYMBOL(ifxmips_port_reserve_pin);
  52
  53 int
  54 ifxmips_port_free_pin (unsigned int port, unsigned int pin)
  55 {
  56         IFXMIPS_GPIO_SANITY;
  57         printk("%s : call to obseleted function\n", __func__);
  58
  59         return 0;
  60 }
  61 EXPORT_SYMBOL(ifxmips_port_free_pin);
  62
  63 int
  64 ifxmips_port_set_open_drain (unsigned int port, unsigned int pin)
  65 {
  66         IFXMIPS_GPIO_SANITY;
  67         writel(readl(IFXMIPS_GPIO_P0_OD + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_OD);
  68
  69         return 0;
  70 }
  71 EXPORT_SYMBOL(ifxmips_port_set_open_drain);
  72
  73 int
  74 ifxmips_port_clear_open_drain (unsigned int port, unsigned int pin)
  75 {
  76         IFXMIPS_GPIO_SANITY;
  77         writel(readl(IFXMIPS_GPIO_P0_OD + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_OD);
  78
  79         return 0;
  80 }
  81 EXPORT_SYMBOL(ifxmips_port_clear_open_drain);
  82
  83 int
  84 ifxmips_port_set_pudsel (unsigned int port, unsigned int pin)
  85 {
  86     IFXMIPS_GPIO_SANITY;
  87         writel(readl(IFXMIPS_GPIO_P0_PUDSEL + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_PUDSEL);
  88
  89         return 0;
  90 }
  91 EXPORT_SYMBOL(ifxmips_port_set_pudsel);
  92
  93 int
  94 ifxmips_port_clear_pudsel (unsigned int port, unsigned int pin)
  95 {
  96     IFXMIPS_GPIO_SANITY;
  97         writel(readl(IFXMIPS_GPIO_P0_PUDSEL + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_PUDSEL);
  98
  99         return 0;
 100 }
 101 EXPORT_SYMBOL(ifxmips_port_clear_pudsel);
 102
 103 int
 104 ifxmips_port_set_puden (unsigned int port, unsigned int pin)
 105 {
 106     IFXMIPS_GPIO_SANITY;
 107         writel(readl(IFXMIPS_GPIO_P0_PUDEN + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_PUDEN);
 108
 109         return 0;
 110 }
 111 EXPORT_SYMBOL(ifxmips_port_set_puden);
 112
 113 int
 114 ifxmips_port_clear_puden (unsigned int port, unsigned int pin)
 115 {
 116     IFXMIPS_GPIO_SANITY;
 117         writel(readl(IFXMIPS_GPIO_P0_PUDEN + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_PUDEN);
 118
 119         return 0;
 120 }
 121 EXPORT_SYMBOL(ifxmips_port_clear_puden);
 122
 123 int
 124 ifxmips_port_set_stoff (unsigned int port, unsigned int pin)
 125 {
 126     IFXMIPS_GPIO_SANITY;
 127         writel(readl(IFXMIPS_GPIO_P0_STOFF + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_STOFF);
 128
 129         return 0;
 130 }
 131 EXPORT_SYMBOL(ifxmips_port_set_stoff);
 132
 133 int
 134 ifxmips_port_clear_stoff (unsigned int port, unsigned int pin)
 135 {
 136     IFXMIPS_GPIO_SANITY;
 137         writel(readl(IFXMIPS_GPIO_P0_STOFF + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_STOFF);
 138
 139         return 0;
 140 }
 141 EXPORT_SYMBOL(ifxmips_port_clear_stoff);
 142
 143 int
 144 ifxmips_port_set_dir_out (unsigned int port, unsigned int pin)
 145 {
 146     IFXMIPS_GPIO_SANITY;
 147         writel(readl(IFXMIPS_GPIO_P0_DIR + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_DIR);
 148
 149         return 0;
 150 }
 151 EXPORT_SYMBOL(ifxmips_port_set_dir_out);
 152
 153 int
 154 ifxmips_port_set_dir_in (unsigned int port, unsigned int pin)
 155 {
 156     IFXMIPS_GPIO_SANITY;
 157         writel(readl(IFXMIPS_GPIO_P0_DIR + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_DIR);
 158
 159         return 0;
 160 }
 161 EXPORT_SYMBOL(ifxmips_port_set_dir_in);
 162
 163 int
 164 ifxmips_port_set_output (unsigned int port, unsigned int pin)
 165 {
 166     IFXMIPS_GPIO_SANITY;
 167         writel(readl(IFXMIPS_GPIO_P0_OUT + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_OUT);
 168
 169         return 0;
 170 }
 171 EXPORT_SYMBOL(ifxmips_port_set_output);
 172
 173 int
 174 ifxmips_port_clear_output (unsigned int port, unsigned int pin)
 175 {
 176     IFXMIPS_GPIO_SANITY;
 177         writel(readl(IFXMIPS_GPIO_P0_OUT + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_OUT);
 178
 179         return 0;
 180 }
 181 EXPORT_SYMBOL(ifxmips_port_clear_output);
 182
 183 int
 184 ifxmips_port_get_input (unsigned int port, unsigned int pin)
 185 {
 186     IFXMIPS_GPIO_SANITY;
 187
 188         if (readl(IFXMIPS_GPIO_P0_IN + (port * 0x30)) & (1 << pin))
 189                 return 0;
 190         else
 191                 return 1;
 192 }
 193 EXPORT_SYMBOL(ifxmips_port_get_input);
 194
 195 int
 196 ifxmips_port_set_altsel0 (unsigned int port, unsigned int pin)
 197 {
 198     IFXMIPS_GPIO_SANITY;
 199         writel(readl(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_ALTSEL0);
 200
 201         return 0;
 202 }
 203 EXPORT_SYMBOL(ifxmips_port_set_altsel0);
 204
 205 int
 206 ifxmips_port_clear_altsel0 (unsigned int port, unsigned int pin)
 207 {
 208     IFXMIPS_GPIO_SANITY;
 209         writel(readl(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_ALTSEL0);
 210
 211         return 0;
 212 }
 213 EXPORT_SYMBOL(ifxmips_port_clear_altsel0);
 214
 215 int
 216 ifxmips_port_set_altsel1 (unsigned int port, unsigned int pin)
 217 {
 218     IFXMIPS_GPIO_SANITY;
 219         writel(readl(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_ALTSEL1);
 220
 221         return 0;
 222 }
 223 EXPORT_SYMBOL(ifxmips_port_set_altsel1);
 224
 225 int
 226 ifxmips_port_clear_altsel1 (unsigned int port, unsigned int pin)
 227 {
 228     IFXMIPS_GPIO_SANITY;
 229         writel(readl(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_ALTSEL1);
 230
 231         return 0;
 232 }
 233 EXPORT_SYMBOL(ifxmips_port_clear_altsel1);
 234
 235 long ifxmips_port_read_procmem_helper(char* tag, u32* in_reg, char *buf)
 236 {
 237         u32 reg, bit = 0;
 238         unsigned int len, t;
 239
 240         len = sprintf(buf, "\n%s: ", tag);
 241         reg = readl(in_reg);
 242         bit = 0x80000000;
 243         for (t = 0; t < 32; t++) {
 244                 if ((reg & bit) > 0)
 245                         len = len + sprintf(buf + len, "X");
 246                 else
 247                         len = len + sprintf(buf + len, " ");
 248                 bit = bit >> 1;
 249         }
 250
 251         return len;
 252 }
 253
 254 int
 255 ifxmips_port_read_procmem (char *buf, char **start, off_t offset, int count,
 256                           int *eof, void *data)
 257 {
 258         long len = sprintf (buf, "\nIFXMips Port Settings\n");
 259
 260         len += sprintf (buf + len,
 261                         "         3         2         1         0\n");
 262         len += sprintf (buf + len,
 263                         "        10987654321098765432109876543210\n");
 264         len += sprintf (buf + len,
 265                         "----------------------------------------\n");
 266
 267         len += ifxmips_port_read_procmem_helper("P0-OUT", IFXMIPS_GPIO_P0_OUT, &buf[len]);
 268         len += ifxmips_port_read_procmem_helper("P1-OUT", IFXMIPS_GPIO_P1_OUT, &buf[len]);
 269         len += ifxmips_port_read_procmem_helper("P0-IN ", IFXMIPS_GPIO_P0_IN, &buf[len]);
 270         len += ifxmips_port_read_procmem_helper("P1-IN ", IFXMIPS_GPIO_P1_IN, &buf[len]);
 271         len += ifxmips_port_read_procmem_helper("P0-DIR", IFXMIPS_GPIO_P0_DIR, &buf[len]);
 272         len += ifxmips_port_read_procmem_helper("P1-DIR", IFXMIPS_GPIO_P1_DIR, &buf[len]);
 273         len += ifxmips_port_read_procmem_helper("P0-STO ", IFXMIPS_GPIO_P0_STOFF, &buf[len]);
 274         len += ifxmips_port_read_procmem_helper("P1-STO ", IFXMIPS_GPIO_P1_STOFF, &buf[len]);
 275         len += ifxmips_port_read_procmem_helper("P0-PUDE", IFXMIPS_GPIO_P0_PUDEN, &buf[len]);
 276         len += ifxmips_port_read_procmem_helper("P1-PUDE", IFXMIPS_GPIO_P1_PUDEN, &buf[len]);
 277         len += ifxmips_port_read_procmem_helper("P0-OD  ", IFXMIPS_GPIO_P0_OD, &buf[len]);
 278         len += ifxmips_port_read_procmem_helper("P1-OD  ", IFXMIPS_GPIO_P1_OD, &buf[len]);
 279         len += ifxmips_port_read_procmem_helper("P0-PUDS", IFXMIPS_GPIO_P0_PUDSEL, &buf[len]);
 280         len += ifxmips_port_read_procmem_helper("P1-PUDS", IFXMIPS_GPIO_P1_PUDSEL, &buf[len]);
 281         len += ifxmips_port_read_procmem_helper("P0-ALT0", IFXMIPS_GPIO_P0_ALTSEL0, &buf[len]);
 282         len += ifxmips_port_read_procmem_helper("P1-ALT0", IFXMIPS_GPIO_P1_ALTSEL0, &buf[len]);
 283         len += ifxmips_port_read_procmem_helper("P0-ALT1", IFXMIPS_GPIO_P0_ALTSEL1, &buf[len]);
 284         len += ifxmips_port_read_procmem_helper("P1-ALT1", IFXMIPS_GPIO_P1_ALTSEL1, &buf[len]);
 285         len = len + sprintf (buf + len, "\n\n");
 286
 287         *eof = 1;
 288
 289         return len;
 290 }
 291
 292 static int
 293 ifxmips_port_open (struct inode *inode, struct file *filep)
 294 {
 295         return 0;
 296 }
 297
 298 static int
 299 ifxmips_port_release (struct inode *inode, struct file *filelp)
 300 {
 301         return 0;
 302 }
 303
 304 static int
 305 ifxmips_port_ioctl (struct inode *inode, struct file *filp,
 306                         unsigned int cmd, unsigned long arg)
 307 {
 308         int ret = 0;
 309         volatile struct ifxmips_port_ioctl_parm parm;
 310
 311         if (_IOC_TYPE (cmd) != IFXMIPS_PORT_IOC_MAGIC)
 312                 return -EINVAL;
 313
 314         if (_IOC_DIR (cmd) & _IOC_WRITE) {
 315                 if (!access_ok
 316                     (VERIFY_READ, arg,
 317                      sizeof (struct ifxmips_port_ioctl_parm)))
 318                         return -EFAULT;
 319                 ret = copy_from_user ((void *) &parm, (void *) arg,
 320                                       sizeof (struct ifxmips_port_ioctl_parm));
 321         }
 322         if (_IOC_DIR (cmd) & _IOC_READ) {
 323                 if (!access_ok
 324                     (VERIFY_WRITE, arg,
 325                      sizeof (struct ifxmips_port_ioctl_parm)))
 326                         return -EFAULT;
 327         }
 328
 329         if (down_trylock (&port_sem) != 0)
 330                 return -EBUSY;
 331
 332         switch (cmd) {
 333         case IFXMIPS_PORT_IOCOD:
 334                 if (parm.value == 0x00)
 335                         ifxmips_port_clear_open_drain(parm.port, parm.pin);
 336                 else
 337                         ifxmips_port_set_open_drain(parm.port, parm.pin);
 338                 break;
 339
 340         case IFXMIPS_PORT_IOCPUDSEL:
 341                 if (parm.value == 0x00)
 342                         ifxmips_port_clear_pudsel(parm.port, parm.pin);
 343                 else
 344                         ifxmips_port_set_pudsel(parm.port, parm.pin);
 345                 break;
 346
 347         case IFXMIPS_PORT_IOCPUDEN:
 348                 if (parm.value == 0x00)
 349                         ifxmips_port_clear_puden(parm.port, parm.pin);
 350                 else
 351                         ifxmips_port_set_puden(parm.port, parm.pin);
 352                 break;
 353
 354         case IFXMIPS_PORT_IOCSTOFF:
 355                 if (parm.value == 0x00)
 356                         ifxmips_port_clear_stoff(parm.port, parm.pin);
 357                 else
 358                         ifxmips_port_set_stoff(parm.port, parm.pin);
 359                 break;
 360
 361         case IFXMIPS_PORT_IOCDIR:
 362                 if (parm.value == 0x00)
 363                         ifxmips_port_set_dir_in(parm.port, parm.pin);
 364                 else
 365                         ifxmips_port_set_dir_out(parm.port, parm.pin);
 366                 break;
 367
 368         case IFXMIPS_PORT_IOCOUTPUT:
 369                 if (parm.value == 0x00)
 370                         ifxmips_port_clear_output(parm.port, parm.pin);
 371                 else
 372                         ifxmips_port_set_output(parm.port, parm.pin);
 373                 break;
 374
 375         case IFXMIPS_PORT_IOCALTSEL0:
 376                 if (parm.value == 0x00)
 377                         ifxmips_port_clear_altsel0(parm.port, parm.pin);
 378                 else
 379                         ifxmips_port_set_altsel0(parm.port, parm.pin);
 380                 break;
 381
 382         case IFXMIPS_PORT_IOCALTSEL1:
 383                 if (parm.value == 0x00)
 384                         ifxmips_port_clear_altsel1(parm.port, parm.pin);
 385                 else
 386                         ifxmips_port_set_altsel1(parm.port, parm.pin);
 387                 break;
 388
 389         case IFXMIPS_PORT_IOCINPUT:
 390                 parm.value = ifxmips_port_get_input(parm.port, parm.pin);
 391                 copy_to_user((void*)arg, (void*)&parm,
 392                         sizeof(struct ifxmips_port_ioctl_parm));
 393                 break;
 394
 395         default:
 396                 ret = -EINVAL;
 397         }
 398
 399         up (&port_sem);
 400
 401         return ret;
 402 }
 403
 404 static struct file_operations port_fops = {
 405       .open = ifxmips_port_open,
 406       .release = ifxmips_port_release,
 407       .ioctl = ifxmips_port_ioctl
 408 };
 409
 410 int __init
 411 ifxmips_gpio_init (void)
 412 {
 413         int retval = 0;
 414
 415         sema_init (&port_sem, 1);
 416
 417         ifxmips_gpio_major = register_chrdev(0, "ifxmips_gpio", &port_fops);
 418         if (!ifxmips_gpio_major)
 419         {
 420                 printk("ifxmips-port: Error! Could not register port device. #%d\n", ifxmips_gpio_major);
 421                 retval = -EINVAL;
 422                 goto out;
 423         }
 424
 425         create_proc_read_entry("ifxmips_gpio", 0, NULL,
 426                                 ifxmips_port_read_procmem, NULL);
 427
 428         printk("registered ifxmips gpio driver\n");
 429
 430 out:
 431         return retval;
 432 }
 433
 434 void __exit
 435 ifxmips_gpio_exit (void)
 436 {
 437         unregister_chrdev(ifxmips_gpio_major, "ifxmips_gpio");
 438         remove_proc_entry("ifxmips_gpio", NULL);
 439 }
 440
 441 module_init(ifxmips_gpio_init);
 442 module_exit(ifxmips_gpio_exit);