arch/cris/arch-v32/drivers/mach-fs/gpio.c

   1 /*
   2  * ETRAX CRISv32 general port I/O device
   3  *
   4  * Copyright (c) 1999-2006 Axis Communications AB
   5  *
   6  * Authors:    Bjorn Wesen      (initial version)
   7  *             Ola Knutsson     (LED handling)
   8  *             Johan Adolfsson  (read/set directions, write, port G,
   9  *                               port to ETRAX FS.
  10  *
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/sched.h>
  15 #include <linux/slab.h>
  16 #include <linux/ioport.h>
  17 #include <linux/errno.h>
  18 #include <linux/kernel.h>
  19 #include <linux/fs.h>
  20 #include <linux/string.h>
  21 #include <linux/poll.h>
  22 #include <linux/init.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/mutex.h>
  26
  27 #include <asm/etraxgpio.h>
  28 #include <hwregs/reg_map.h>
  29 #include <hwregs/reg_rdwr.h>
  30 #include <hwregs/gio_defs.h>
  31 #include <hwregs/intr_vect_defs.h>
  32 #include <asm/io.h>
  33 #include <asm/irq.h>
  34
  35 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
  36 #include "../i2c.h"
  37
  38 #define VIRT_I2C_ADDR 0x40
  39 #endif
  40
  41 /* The following gio ports on ETRAX FS is available:
  42  * pa  8 bits, supports interrupts off, hi, low, set, posedge, negedge anyedge
  43  * pb 18 bits
  44  * pc 18 bits
  45  * pd 18 bits
  46  * pe 18 bits
  47  * each port has a rw_px_dout, r_px_din and rw_px_oe register.
  48  */
  49
  50 #define GPIO_MAJOR 120  /* experimental MAJOR number */
  51
  52 #define D(x)
  53
  54 #if 0
  55 static int dp_cnt;
  56 #define DP(x) \
  57         do { \
  58                 dp_cnt++; \
  59                 if (dp_cnt % 1000 == 0) \
  60                         x; \
  61         } while (0)
  62 #else
  63 #define DP(x)
  64 #endif
  65
  66 static DEFINE_MUTEX(gpio_mutex);
  67 static char gpio_name[] = "etrax gpio";
  68
  69 #if 0
  70 static wait_queue_head_t *gpio_wq;
  71 #endif
  72
  73 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
  74 static int virtual_gpio_ioctl(struct file *file, unsigned int cmd,
  75         unsigned long arg);
  76 #endif
  77 static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
  78 static ssize_t gpio_write(struct file *file, const char *buf, size_t count,
  79         loff_t *off);
  80 static int gpio_open(struct inode *inode, struct file *filp);
  81 static int gpio_release(struct inode *inode, struct file *filp);
  82 static unsigned int gpio_poll(struct file *filp,
  83         struct poll_table_struct *wait);
  84
  85 /* private data per open() of this driver */
  86
  87 struct gpio_private {
  88         struct gpio_private *next;
  89         /* The IO_CFG_WRITE_MODE_VALUE only support 8 bits: */
  90         unsigned char clk_mask;
  91         unsigned char data_mask;
  92         unsigned char write_msb;
  93         unsigned char pad1;
  94         /* These fields are generic */
  95         unsigned long highalarm, lowalarm;
  96         wait_queue_head_t alarm_wq;
  97         int minor;
  98 };
  99
 100 /* linked list of alarms to check for */
 101
 102 static struct gpio_private *alarmlist;
 103
 104 static int gpio_some_alarms; /* Set if someone uses alarm */
 105 static unsigned long gpio_pa_high_alarms;
 106 static unsigned long gpio_pa_low_alarms;
 107
 108 static DEFINE_SPINLOCK(alarm_lock);
 109
 110 #define NUM_PORTS (GPIO_MINOR_LAST+1)
 111 #define GIO_REG_RD_ADDR(reg) \
 112         (volatile unsigned long *)(regi_gio + REG_RD_ADDR_gio_##reg)
 113 #define GIO_REG_WR_ADDR(reg) \
 114         (volatile unsigned long *)(regi_gio + REG_RD_ADDR_gio_##reg)
 115 unsigned long led_dummy;
 116 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 117 static unsigned long virtual_dummy;
 118 static unsigned long virtual_rw_pv_oe = CONFIG_ETRAX_DEF_GIO_PV_OE;
 119 static unsigned short cached_virtual_gpio_read;
 120 #endif
 121
 122 static volatile unsigned long *data_out[NUM_PORTS] = {
 123         GIO_REG_WR_ADDR(rw_pa_dout),
 124         GIO_REG_WR_ADDR(rw_pb_dout),
 125         &led_dummy,
 126         GIO_REG_WR_ADDR(rw_pc_dout),
 127         GIO_REG_WR_ADDR(rw_pd_dout),
 128         GIO_REG_WR_ADDR(rw_pe_dout),
 129 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 130         &virtual_dummy,
 131 #endif
 132 };
 133
 134 static volatile unsigned long *data_in[NUM_PORTS] = {
 135         GIO_REG_RD_ADDR(r_pa_din),
 136         GIO_REG_RD_ADDR(r_pb_din),
 137         &led_dummy,
 138         GIO_REG_RD_ADDR(r_pc_din),
 139         GIO_REG_RD_ADDR(r_pd_din),
 140         GIO_REG_RD_ADDR(r_pe_din),
 141 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 142         &virtual_dummy,
 143 #endif
 144 };
 145
 146 static unsigned long changeable_dir[NUM_PORTS] = {
 147         CONFIG_ETRAX_PA_CHANGEABLE_DIR,
 148         CONFIG_ETRAX_PB_CHANGEABLE_DIR,
 149         0,
 150         CONFIG_ETRAX_PC_CHANGEABLE_DIR,
 151         CONFIG_ETRAX_PD_CHANGEABLE_DIR,
 152         CONFIG_ETRAX_PE_CHANGEABLE_DIR,
 153 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 154         CONFIG_ETRAX_PV_CHANGEABLE_DIR,
 155 #endif
 156 };
 157
 158 static unsigned long changeable_bits[NUM_PORTS] = {
 159         CONFIG_ETRAX_PA_CHANGEABLE_BITS,
 160         CONFIG_ETRAX_PB_CHANGEABLE_BITS,
 161         0,
 162         CONFIG_ETRAX_PC_CHANGEABLE_BITS,
 163         CONFIG_ETRAX_PD_CHANGEABLE_BITS,
 164         CONFIG_ETRAX_PE_CHANGEABLE_BITS,
 165 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 166         CONFIG_ETRAX_PV_CHANGEABLE_BITS,
 167 #endif
 168 };
 169
 170 static volatile unsigned long *dir_oe[NUM_PORTS] = {
 171         GIO_REG_WR_ADDR(rw_pa_oe),
 172         GIO_REG_WR_ADDR(rw_pb_oe),
 173         &led_dummy,
 174         GIO_REG_WR_ADDR(rw_pc_oe),
 175         GIO_REG_WR_ADDR(rw_pd_oe),
 176         GIO_REG_WR_ADDR(rw_pe_oe),
 177 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 178         &virtual_rw_pv_oe,
 179 #endif
 180 };
 181
 182
 183
 184 static unsigned int gpio_poll(struct file *file, struct poll_table_struct *wait)
 185 {
 186         unsigned int mask = 0;
 187         struct gpio_private *priv = file->private_data;
 188         unsigned long data;
 189         poll_wait(file, &priv->alarm_wq, wait);
 190         if (priv->minor == GPIO_MINOR_A) {
 191                 reg_gio_rw_intr_cfg intr_cfg;
 192                 unsigned long tmp;
 193                 unsigned long flags;
 194
 195                 local_irq_save(flags);
 196                 data = REG_TYPE_CONV(unsigned long, reg_gio_r_pa_din,
 197                         REG_RD(gio, regi_gio, r_pa_din));
 198                 /* PA has support for interrupt
 199                  * lets activate high for those low and with highalarm set
 200                  */
 201                 intr_cfg = REG_RD(gio, regi_gio, rw_intr_cfg);
 202
 203                 tmp = ~data & priv->highalarm & 0xFF;
 204                 if (tmp & (1 << 0))
 205                         intr_cfg.pa0 = regk_gio_hi;
 206                 if (tmp & (1 << 1))
 207                         intr_cfg.pa1 = regk_gio_hi;
 208                 if (tmp & (1 << 2))
 209                         intr_cfg.pa2 = regk_gio_hi;
 210                 if (tmp & (1 << 3))
 211                         intr_cfg.pa3 = regk_gio_hi;
 212                 if (tmp & (1 << 4))
 213                         intr_cfg.pa4 = regk_gio_hi;
 214                 if (tmp & (1 << 5))
 215                         intr_cfg.pa5 = regk_gio_hi;
 216                 if (tmp & (1 << 6))
 217                         intr_cfg.pa6 = regk_gio_hi;
 218                 if (tmp & (1 << 7))
 219                         intr_cfg.pa7 = regk_gio_hi;
 220                 /*
 221                  * lets activate low for those high and with lowalarm set
 222                  */
 223                 tmp = data & priv->lowalarm & 0xFF;
 224                 if (tmp & (1 << 0))
 225                         intr_cfg.pa0 = regk_gio_lo;
 226                 if (tmp & (1 << 1))
 227                         intr_cfg.pa1 = regk_gio_lo;
 228                 if (tmp & (1 << 2))
 229                         intr_cfg.pa2 = regk_gio_lo;
 230                 if (tmp & (1 << 3))
 231                         intr_cfg.pa3 = regk_gio_lo;
 232                 if (tmp & (1 << 4))
 233                         intr_cfg.pa4 = regk_gio_lo;
 234                 if (tmp & (1 << 5))
 235                         intr_cfg.pa5 = regk_gio_lo;
 236                 if (tmp & (1 << 6))
 237                         intr_cfg.pa6 = regk_gio_lo;
 238                 if (tmp & (1 << 7))
 239                         intr_cfg.pa7 = regk_gio_lo;
 240
 241                 REG_WR(gio, regi_gio, rw_intr_cfg, intr_cfg);
 242                 local_irq_restore(flags);
 243         } else if (priv->minor <= GPIO_MINOR_E)
 244                 data = *data_in[priv->minor];
 245         else
 246                 return 0;
 247
 248         if ((data & priv->highalarm) || (~data & priv->lowalarm))
 249                 mask = POLLIN|POLLRDNORM;
 250
 251         DP(printk(KERN_DEBUG "gpio_poll ready: mask 0x%08X\n", mask));
 252         return mask;
 253 }
 254
 255 int etrax_gpio_wake_up_check(void)
 256 {
 257         struct gpio_private *priv;
 258         unsigned long data = 0;
 259         unsigned long flags;
 260         int ret = 0;
 261         spin_lock_irqsave(&alarm_lock, flags);
 262         priv = alarmlist;
 263         while (priv) {
 264 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 265                 if (priv->minor == GPIO_MINOR_V)
 266                         data = (unsigned long)cached_virtual_gpio_read;
 267                 else {
 268                         data = *data_in[priv->minor];
 269                         if (priv->minor == GPIO_MINOR_A)
 270                                 priv->lowalarm |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
 271                 }
 272 #else
 273                 data = *data_in[priv->minor];
 274 #endif
 275                 if ((data & priv->highalarm) ||
 276                     (~data & priv->lowalarm)) {
 277                         DP(printk(KERN_DEBUG
 278                                 "etrax_gpio_wake_up_check %i\n", priv->minor));
 279                         wake_up_interruptible(&priv->alarm_wq);
 280                         ret = 1;
 281                 }
 282                 priv = priv->next;
 283         }
 284         spin_unlock_irqrestore(&alarm_lock, flags);
 285         return ret;
 286 }
 287
 288 static irqreturn_t
 289 gpio_poll_timer_interrupt(int irq, void *dev_id)
 290 {
 291         if (gpio_some_alarms)
 292                 return IRQ_RETVAL(etrax_gpio_wake_up_check());
 293         return IRQ_NONE;
 294 }
 295
 296 static irqreturn_t
 297 gpio_pa_interrupt(int irq, void *dev_id)
 298 {
 299         reg_gio_rw_intr_mask intr_mask;
 300         reg_gio_r_masked_intr masked_intr;
 301         reg_gio_rw_ack_intr ack_intr;
 302         unsigned long tmp;
 303         unsigned long tmp2;
 304 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 305         unsigned char enable_gpiov_ack = 0;
 306 #endif
 307
 308         /* Find what PA interrupts are active */
 309         masked_intr = REG_RD(gio, regi_gio, r_masked_intr);
 310         tmp = REG_TYPE_CONV(unsigned long, reg_gio_r_masked_intr, masked_intr);
 311
 312         /* Find those that we have enabled */
 313         spin_lock(&alarm_lock);
 314         tmp &= (gpio_pa_high_alarms | gpio_pa_low_alarms);
 315         spin_unlock(&alarm_lock);
 316
 317 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 318         /* Something changed on virtual GPIO. Interrupt is acked by
 319          * reading the device.
 320          */
 321         if (tmp & (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN)) {
 322                 i2c_read(VIRT_I2C_ADDR, (void *)&cached_virtual_gpio_read,
 323                         sizeof(cached_virtual_gpio_read));
 324                 enable_gpiov_ack = 1;
 325         }
 326 #endif
 327
 328         /* Ack them */
 329         ack_intr = REG_TYPE_CONV(reg_gio_rw_ack_intr, unsigned long, tmp);
 330         REG_WR(gio, regi_gio, rw_ack_intr, ack_intr);
 331
 332         /* Disable those interrupts.. */
 333         intr_mask = REG_RD(gio, regi_gio, rw_intr_mask);
 334         tmp2 = REG_TYPE_CONV(unsigned long, reg_gio_rw_intr_mask, intr_mask);
 335         tmp2 &= ~tmp;
 336 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 337         /* Do not disable interrupt on virtual GPIO. Changes on virtual
 338          * pins are only noticed by an interrupt.
 339          */
 340         if (enable_gpiov_ack)
 341                 tmp2 |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
 342 #endif
 343         intr_mask = REG_TYPE_CONV(reg_gio_rw_intr_mask, unsigned long, tmp2);
 344         REG_WR(gio, regi_gio, rw_intr_mask, intr_mask);
 345
 346         if (gpio_some_alarms)
 347                 return IRQ_RETVAL(etrax_gpio_wake_up_check());
 348         return IRQ_NONE;
 349 }
 350
 351
 352 static ssize_t gpio_write(struct file *file, const char *buf, size_t count,
 353         loff_t *off)
 354 {
 355         struct gpio_private *priv = file->private_data;
 356         unsigned char data, clk_mask, data_mask, write_msb;
 357         unsigned long flags;
 358         unsigned long shadow;
 359         volatile unsigned long *port;
 360         ssize_t retval = count;
 361         /* Only bits 0-7 may be used for write operations but allow all
 362            devices except leds... */
 363 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 364         if (priv->minor == GPIO_MINOR_V)
 365                 return -EFAULT;
 366 #endif
 367         if (priv->minor == GPIO_MINOR_LEDS)
 368                 return -EFAULT;
 369
 370         if (!access_ok(VERIFY_READ, buf, count))
 371                 return -EFAULT;
 372         clk_mask = priv->clk_mask;
 373         data_mask = priv->data_mask;
 374         /* It must have been configured using the IO_CFG_WRITE_MODE */
 375         /* Perhaps a better error code? */
 376         if (clk_mask == 0 || data_mask == 0)
 377                 return -EPERM;
 378         write_msb = priv->write_msb;
 379         D(printk(KERN_DEBUG "gpio_write: %lu to data 0x%02X clk 0x%02X "
 380                 "msb: %i\n", count, data_mask, clk_mask, write_msb));
 381         port = data_out[priv->minor];
 382
 383         while (count--) {
 384                 int i;
 385                 data = *buf++;
 386                 if (priv->write_msb) {
 387                         for (i = 7; i >= 0; i--) {
 388                                 local_irq_save(flags);
 389                                 shadow = *port;
 390                                 *port = shadow &= ~clk_mask;
 391                                 if (data & 1<<i)
 392                                         *port = shadow |= data_mask;
 393                                 else
 394                                         *port = shadow &= ~data_mask;
 395                         /* For FPGA: min 5.0ns (DCC) before CCLK high */
 396                                 *port = shadow |= clk_mask;
 397                                 local_irq_restore(flags);
 398                         }
 399                 } else {
 400                         for (i = 0; i <= 7; i++) {
 401                                 local_irq_save(flags);
 402                                 shadow = *port;
 403                                 *port = shadow &= ~clk_mask;
 404                                 if (data & 1<<i)
 405                                         *port = shadow |= data_mask;
 406                                 else
 407                                         *port = shadow &= ~data_mask;
 408                         /* For FPGA: min 5.0ns (DCC) before CCLK high */
 409                                 *port = shadow |= clk_mask;
 410                                 local_irq_restore(flags);
 411                         }
 412                 }
 413         }
 414         return retval;
 415 }
 416
 417
 418
 419 static int
 420 gpio_open(struct inode *inode, struct file *filp)
 421 {
 422         struct gpio_private *priv;
 423         int p = iminor(inode);
 424
 425         if (p > GPIO_MINOR_LAST)
 426                 return -EINVAL;
 427
 428         priv = kmalloc(sizeof(struct gpio_private), GFP_KERNEL);
 429         if (!priv)
 430                 return -ENOMEM;
 431
 432         mutex_lock(&gpio_mutex);
 433         memset(priv, 0, sizeof(*priv));
 434
 435         priv->minor = p;
 436
 437         /* initialize the io/alarm struct */
 438
 439         priv->clk_mask = 0;
 440         priv->data_mask = 0;
 441         priv->highalarm = 0;
 442         priv->lowalarm = 0;
 443         init_waitqueue_head(&priv->alarm_wq);
 444
 445         filp->private_data = (void *)priv;
 446
 447         /* link it into our alarmlist */
 448         spin_lock_irq(&alarm_lock);
 449         priv->next = alarmlist;
 450         alarmlist = priv;
 451         spin_unlock_irq(&alarm_lock);
 452
 453         mutex_unlock(&gpio_mutex);
 454         return 0;
 455 }
 456
 457 static int
 458 gpio_release(struct inode *inode, struct file *filp)
 459 {
 460         struct gpio_private *p;
 461         struct gpio_private *todel;
 462         /* local copies while updating them: */
 463         unsigned long a_high, a_low;
 464         unsigned long some_alarms;
 465
 466         /* unlink from alarmlist and free the private structure */
 467
 468         spin_lock_irq(&alarm_lock);
 469         p = alarmlist;
 470         todel = filp->private_data;
 471
 472         if (p == todel) {
 473                 alarmlist = todel->next;
 474         } else {
 475                 while (p->next != todel)
 476                         p = p->next;
 477                 p->next = todel->next;
 478         }
 479
 480         kfree(todel);
 481         /* Check if there are still any alarms set */
 482         p = alarmlist;
 483         some_alarms = 0;
 484         a_high = 0;
 485         a_low = 0;
 486         while (p) {
 487                 if (p->minor == GPIO_MINOR_A) {
 488 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 489                         p->lowalarm |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
 490 #endif
 491                         a_high |= p->highalarm;
 492                         a_low |= p->lowalarm;
 493                 }
 494
 495                 if (p->highalarm | p->lowalarm)
 496                         some_alarms = 1;
 497                 p = p->next;
 498         }
 499
 500 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 501         /* Variables 'some_alarms' and 'a_low' needs to be set here again
 502          * to ensure that interrupt for virtual GPIO is handled.
 503          */
 504         some_alarms = 1;
 505         a_low |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
 506 #endif
 507
 508         gpio_some_alarms = some_alarms;
 509         gpio_pa_high_alarms = a_high;
 510         gpio_pa_low_alarms = a_low;
 511         spin_unlock_irq(&alarm_lock);
 512
 513         return 0;
 514 }
 515
 516 /* Main device API. ioctl's to read/set/clear bits, as well as to
 517  * set alarms to wait for using a subsequent select().
 518  */
 519
 520 inline unsigned long setget_input(struct gpio_private *priv, unsigned long arg)
 521 {
 522         /* Set direction 0=unchanged 1=input,
 523          * return mask with 1=input
 524          */
 525         unsigned long flags;
 526         unsigned long dir_shadow;
 527
 528         local_irq_save(flags);
 529         dir_shadow = *dir_oe[priv->minor];
 530         dir_shadow &= ~(arg & changeable_dir[priv->minor]);
 531         *dir_oe[priv->minor] = dir_shadow;
 532         local_irq_restore(flags);
 533
 534         if (priv->minor == GPIO_MINOR_A)
 535                 dir_shadow ^= 0xFF;    /* Only 8 bits */
 536 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 537         else if (priv->minor == GPIO_MINOR_V)
 538                 dir_shadow ^= 0xFFFF;  /* Only 16 bits */
 539 #endif
 540         else
 541                 dir_shadow ^= 0x3FFFF; /* Only 18 bits */
 542         return dir_shadow;
 543
 544 } /* setget_input */
 545
 546 inline unsigned long setget_output(struct gpio_private *priv, unsigned long arg)
 547 {
 548         unsigned long flags;
 549         unsigned long dir_shadow;
 550
 551         local_irq_save(flags);
 552         dir_shadow = *dir_oe[priv->minor];
 553         dir_shadow |=  (arg & changeable_dir[priv->minor]);
 554         *dir_oe[priv->minor] = dir_shadow;
 555         local_irq_restore(flags);
 556         return dir_shadow;
 557 } /* setget_output */
 558
 559 static int gpio_leds_ioctl(unsigned int cmd, unsigned long arg);
 560
 561 static int
 562 gpio_ioctl_unlocked(struct file *file, unsigned int cmd, unsigned long arg)
 563 {
 564         unsigned long flags;
 565         unsigned long val;
 566         unsigned long shadow;
 567         struct gpio_private *priv = file->private_data;
 568         if (_IOC_TYPE(cmd) != ETRAXGPIO_IOCTYPE)
 569                 return -EINVAL;
 570
 571 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 572         if (priv->minor == GPIO_MINOR_V)
 573                 return virtual_gpio_ioctl(file, cmd, arg);
 574 #endif
 575
 576         switch (_IOC_NR(cmd)) {
 577         case IO_READBITS: /* Use IO_READ_INBITS and IO_READ_OUTBITS instead */
 578                 /* Read the port. */
 579                 return *data_in[priv->minor];
 580                 break;
 581         case IO_SETBITS:
 582                 local_irq_save(flags);
 583                 /* Set changeable bits with a 1 in arg. */
 584                 shadow = *data_out[priv->minor];
 585                 shadow |=  (arg & changeable_bits[priv->minor]);
 586                 *data_out[priv->minor] = shadow;
 587                 local_irq_restore(flags);
 588                 break;
 589         case IO_CLRBITS:
 590                 local_irq_save(flags);
 591                 /* Clear changeable bits with a 1 in arg. */
 592                 shadow = *data_out[priv->minor];
 593                 shadow &=  ~(arg & changeable_bits[priv->minor]);
 594                 *data_out[priv->minor] = shadow;
 595                 local_irq_restore(flags);
 596                 break;
 597         case IO_HIGHALARM:
 598                 /* Set alarm when bits with 1 in arg go high. */
 599                 priv->highalarm |= arg;
 600                 spin_lock_irqsave(&alarm_lock, flags);
 601                 gpio_some_alarms = 1;
 602                 if (priv->minor == GPIO_MINOR_A)
 603                         gpio_pa_high_alarms |= arg;
 604                 spin_unlock_irqrestore(&alarm_lock, flags);
 605                 break;
 606         case IO_LOWALARM:
 607                 /* Set alarm when bits with 1 in arg go low. */
 608                 priv->lowalarm |= arg;
 609                 spin_lock_irqsave(&alarm_lock, flags);
 610                 gpio_some_alarms = 1;
 611                 if (priv->minor == GPIO_MINOR_A)
 612                         gpio_pa_low_alarms |= arg;
 613                 spin_unlock_irqrestore(&alarm_lock, flags);
 614                 break;
 615         case IO_CLRALARM:
 616                 /* Clear alarm for bits with 1 in arg. */
 617                 priv->highalarm &= ~arg;
 618                 priv->lowalarm  &= ~arg;
 619                 spin_lock_irqsave(&alarm_lock, flags);
 620                 if (priv->minor == GPIO_MINOR_A) {
 621                         if (gpio_pa_high_alarms & arg ||
 622                             gpio_pa_low_alarms & arg)
 623                                 /* Must update the gpio_pa_*alarms masks */
 624                                 ;
 625                 }
 626                 spin_unlock_irqrestore(&alarm_lock, flags);
 627                 break;
 628         case IO_READDIR: /* Use IO_SETGET_INPUT/OUTPUT instead! */
 629                 /* Read direction 0=input 1=output */
 630                 return *dir_oe[priv->minor];
 631         case IO_SETINPUT: /* Use IO_SETGET_INPUT instead! */
 632                 /* Set direction 0=unchanged 1=input,
 633                  * return mask with 1=input
 634                  */
 635                 return setget_input(priv, arg);
 636                 break;
 637         case IO_SETOUTPUT: /* Use IO_SETGET_OUTPUT instead! */
 638                 /* Set direction 0=unchanged 1=output,
 639                  * return mask with 1=output
 640                  */
 641                 return setget_output(priv, arg);
 642
 643         case IO_CFG_WRITE_MODE:
 644         {
 645                 unsigned long dir_shadow;
 646                 dir_shadow = *dir_oe[priv->minor];
 647
 648                 priv->clk_mask = arg & 0xFF;
 649                 priv->data_mask = (arg >> 8) & 0xFF;
 650                 priv->write_msb = (arg >> 16) & 0x01;
 651                 /* Check if we're allowed to change the bits and
 652                  * the direction is correct
 653                  */
 654                 if (!((priv->clk_mask & changeable_bits[priv->minor]) &&
 655                       (priv->data_mask & changeable_bits[priv->minor]) &&
 656                       (priv->clk_mask & dir_shadow) &&
 657                       (priv->data_mask & dir_shadow))) {
 658                         priv->clk_mask = 0;
 659                         priv->data_mask = 0;
 660                         return -EPERM;
 661                 }
 662                 break;
 663         }
 664         case IO_READ_INBITS:
 665                 /* *arg is result of reading the input pins */
 666                 val = *data_in[priv->minor];
 667                 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
 668                         return -EFAULT;
 669                 return 0;
 670                 break;
 671         case IO_READ_OUTBITS:
 672                  /* *arg is result of reading the output shadow */
 673                 val = *data_out[priv->minor];
 674                 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
 675                         return -EFAULT;
 676                 break;
 677         case IO_SETGET_INPUT:
 678                 /* bits set in *arg is set to input,
 679                  * *arg updated with current input pins.
 680                  */
 681                 if (copy_from_user(&val, (unsigned long *)arg, sizeof(val)))
 682                         return -EFAULT;
 683                 val = setget_input(priv, val);
 684                 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
 685                         return -EFAULT;
 686                 break;
 687         case IO_SETGET_OUTPUT:
 688                 /* bits set in *arg is set to output,
 689                  * *arg updated with current output pins.
 690                  */
 691                 if (copy_from_user(&val, (unsigned long *)arg, sizeof(val)))
 692                         return -EFAULT;
 693                 val = setget_output(priv, val);
 694                 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
 695                         return -EFAULT;
 696                 break;
 697         default:
 698                 if (priv->minor == GPIO_MINOR_LEDS)
 699                         return gpio_leds_ioctl(cmd, arg);
 700                 else
 701                         return -EINVAL;
 702         } /* switch */
 703
 704         return 0;
 705 }
 706
 707 static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 708 {
 709        long ret;
 710
 711        mutex_lock(&gpio_mutex);
 712        ret = gpio_ioctl_unlocked(file, cmd, arg);
 713        mutex_unlock(&gpio_mutex);
 714
 715        return ret;
 716 }
 717
 718 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 719 static int
 720 virtual_gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 721 {
 722         unsigned long flags;
 723         unsigned short val;
 724         unsigned short shadow;
 725         struct gpio_private *priv = file->private_data;
 726
 727         switch (_IOC_NR(cmd)) {
 728         case IO_SETBITS:
 729                 local_irq_save(flags);
 730                 /* Set changeable bits with a 1 in arg. */
 731                 i2c_read(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
 732                 shadow |= ~*dir_oe[priv->minor];
 733                 shadow |= (arg & changeable_bits[priv->minor]);
 734                 i2c_write(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
 735                 local_irq_restore(flags);
 736                 break;
 737         case IO_CLRBITS:
 738                 local_irq_save(flags);
 739                 /* Clear changeable bits with a 1 in arg. */
 740                 i2c_read(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
 741                 shadow |= ~*dir_oe[priv->minor];
 742                 shadow &= ~(arg & changeable_bits[priv->minor]);
 743                 i2c_write(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
 744                 local_irq_restore(flags);
 745                 break;
 746         case IO_HIGHALARM:
 747                 /* Set alarm when bits with 1 in arg go high. */
 748                 priv->highalarm |= arg;
 749                 spin_lock(&alarm_lock);
 750                 gpio_some_alarms = 1;
 751                 spin_unlock(&alarm_lock);
 752                 break;
 753         case IO_LOWALARM:
 754                 /* Set alarm when bits with 1 in arg go low. */
 755                 priv->lowalarm |= arg;
 756                 spin_lock(&alarm_lock);
 757                 gpio_some_alarms = 1;
 758                 spin_unlock(&alarm_lock);
 759                 break;
 760         case IO_CLRALARM:
 761                 /* Clear alarm for bits with 1 in arg. */
 762                 priv->highalarm &= ~arg;
 763                 priv->lowalarm  &= ~arg;
 764                 spin_lock(&alarm_lock);
 765                 spin_unlock(&alarm_lock);
 766                 break;
 767         case IO_CFG_WRITE_MODE:
 768         {
 769                 unsigned long dir_shadow;
 770                 dir_shadow = *dir_oe[priv->minor];
 771
 772                 priv->clk_mask = arg & 0xFF;
 773                 priv->data_mask = (arg >> 8) & 0xFF;
 774                 priv->write_msb = (arg >> 16) & 0x01;
 775                 /* Check if we're allowed to change the bits and
 776                  * the direction is correct
 777                  */
 778                 if (!((priv->clk_mask & changeable_bits[priv->minor]) &&
 779                       (priv->data_mask & changeable_bits[priv->minor]) &&
 780                       (priv->clk_mask & dir_shadow) &&
 781                       (priv->data_mask & dir_shadow))) {
 782                         priv->clk_mask = 0;
 783                         priv->data_mask = 0;
 784                         return -EPERM;
 785                 }
 786                 break;
 787         }
 788         case IO_READ_INBITS:
 789                 /* *arg is result of reading the input pins */
 790                 val = cached_virtual_gpio_read;
 791                 val &= ~*dir_oe[priv->minor];
 792                 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
 793                         return -EFAULT;
 794                 return 0;
 795                 break;
 796         case IO_READ_OUTBITS:
 797                  /* *arg is result of reading the output shadow */
 798                 i2c_read(VIRT_I2C_ADDR, (void *)&val, sizeof(val));
 799                 val &= *dir_oe[priv->minor];
 800                 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
 801                         return -EFAULT;
 802                 break;
 803         case IO_SETGET_INPUT:
 804         {
 805                 /* bits set in *arg is set to input,
 806                  * *arg updated with current input pins.
 807                  */
 808                 unsigned short input_mask = ~*dir_oe[priv->minor];
 809                 if (copy_from_user(&val, (unsigned long *)arg, sizeof(val)))
 810                         return -EFAULT;
 811                 val = setget_input(priv, val);
 812                 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
 813                         return -EFAULT;
 814                 if ((input_mask & val) != input_mask) {
 815                         /* Input pins changed. All ports desired as input
 816                          * should be set to logic 1.
 817                          */
 818                         unsigned short change = input_mask ^ val;
 819                         i2c_read(VIRT_I2C_ADDR, (void *)&shadow,
 820                                 sizeof(shadow));
 821                         shadow &= ~change;
 822                         shadow |= val;
 823                         i2c_write(VIRT_I2C_ADDR, (void *)&shadow,
 824                                 sizeof(shadow));
 825                 }
 826                 break;
 827         }
 828         case IO_SETGET_OUTPUT:
 829                 /* bits set in *arg is set to output,
 830                  * *arg updated with current output pins.
 831                  */
 832                 if (copy_from_user(&val, (unsigned long *)arg, sizeof(val)))
 833                         return -EFAULT;
 834                 val = setget_output(priv, val);
 835                 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
 836                         return -EFAULT;
 837                 break;
 838         default:
 839                 return -EINVAL;
 840         } /* switch */
 841   return 0;
 842 }
 843 #endif /* CONFIG_ETRAX_VIRTUAL_GPIO */
 844
 845 static int
 846 gpio_leds_ioctl(unsigned int cmd, unsigned long arg)
 847 {
 848         unsigned char green;
 849         unsigned char red;
 850
 851         switch (_IOC_NR(cmd)) {
 852         case IO_LEDACTIVE_SET:
 853                 green = ((unsigned char) arg) & 1;
 854                 red   = (((unsigned char) arg) >> 1) & 1;
 855                 CRIS_LED_ACTIVE_SET_G(green);
 856                 CRIS_LED_ACTIVE_SET_R(red);
 857                 break;
 858
 859         default:
 860                 return -EINVAL;
 861         } /* switch */
 862
 863         return 0;
 864 }
 865
 866 static const struct file_operations gpio_fops = {
 867         .owner          = THIS_MODULE,
 868         .poll           = gpio_poll,
 869         .unlocked_ioctl = gpio_ioctl,
 870         .write          = gpio_write,
 871         .open           = gpio_open,
 872         .release        = gpio_release,
 873         .llseek         = noop_llseek,
 874 };
 875
 876 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 877 static void
 878 virtual_gpio_init(void)
 879 {
 880         reg_gio_rw_intr_cfg intr_cfg;
 881         reg_gio_rw_intr_mask intr_mask;
 882         unsigned short shadow;
 883
 884         shadow = ~virtual_rw_pv_oe; /* Input ports should be set to logic 1 */
 885         shadow |= CONFIG_ETRAX_DEF_GIO_PV_OUT;
 886         i2c_write(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
 887
 888         /* Set interrupt mask and on what state the interrupt shall trigger.
 889          * For virtual gpio the interrupt shall trigger on logic '0'.
 890          */
 891         intr_cfg = REG_RD(gio, regi_gio, rw_intr_cfg);
 892         intr_mask = REG_RD(gio, regi_gio, rw_intr_mask);
 893
 894         switch (CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN) {
 895         case 0:
 896                 intr_cfg.pa0 = regk_gio_lo;
 897                 intr_mask.pa0 = regk_gio_yes;
 898                 break;
 899         case 1:
 900                 intr_cfg.pa1 = regk_gio_lo;
 901                 intr_mask.pa1 = regk_gio_yes;
 902                 break;
 903         case 2:
 904                 intr_cfg.pa2 = regk_gio_lo;
 905                 intr_mask.pa2 = regk_gio_yes;
 906                 break;
 907         case 3:
 908                 intr_cfg.pa3 = regk_gio_lo;
 909                 intr_mask.pa3 = regk_gio_yes;
 910                 break;
 911         case 4:
 912                 intr_cfg.pa4 = regk_gio_lo;
 913                 intr_mask.pa4 = regk_gio_yes;
 914                 break;
 915         case 5:
 916                 intr_cfg.pa5 = regk_gio_lo;
 917                 intr_mask.pa5 = regk_gio_yes;
 918                 break;
 919         case 6:
 920                 intr_cfg.pa6 = regk_gio_lo;
 921                 intr_mask.pa6 = regk_gio_yes;
 922                 break;
 923         case 7:
 924                 intr_cfg.pa7 = regk_gio_lo;
 925                 intr_mask.pa7 = regk_gio_yes;
 926         break;
 927         }
 928
 929         REG_WR(gio, regi_gio, rw_intr_cfg, intr_cfg);
 930         REG_WR(gio, regi_gio, rw_intr_mask, intr_mask);
 931
 932         gpio_pa_low_alarms |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
 933         gpio_some_alarms = 1;
 934 }
 935 #endif
 936
 937 /* main driver initialization routine, called from mem.c */
 938
 939 static __init int
 940 gpio_init(void)
 941 {
 942         int res;
 943
 944         /* do the formalities */
 945
 946         res = register_chrdev(GPIO_MAJOR, gpio_name, &gpio_fops);
 947         if (res < 0) {
 948                 printk(KERN_ERR "gpio: couldn't get a major number.\n");
 949                 return res;
 950         }
 951
 952         /* Clear all leds */
 953         CRIS_LED_NETWORK_GRP0_SET(0);
 954         CRIS_LED_NETWORK_GRP1_SET(0);
 955         CRIS_LED_ACTIVE_SET(0);
 956         CRIS_LED_DISK_READ(0);
 957         CRIS_LED_DISK_WRITE(0);
 958
 959         printk(KERN_INFO "ETRAX FS GPIO driver v2.5, (c) 2003-2007 "
 960                 "Axis Communications AB\n");
 961         /* We call etrax_gpio_wake_up_check() from timer interrupt and
 962          * from cpu_idle() in kernel/process.c
 963          * The check in cpu_idle() reduces latency from ~15 ms to ~6 ms
 964          * in some tests.
 965          */
 966         if (request_irq(TIMER0_INTR_VECT, gpio_poll_timer_interrupt,
 967                         IRQF_SHARED | IRQF_DISABLED, "gpio poll", &alarmlist))
 968                 printk(KERN_ERR "timer0 irq for gpio\n");
 969
 970         if (request_irq(GIO_INTR_VECT, gpio_pa_interrupt,
 971                         IRQF_SHARED | IRQF_DISABLED, "gpio PA", &alarmlist))
 972                 printk(KERN_ERR "PA irq for gpio\n");
 973
 974 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
 975         virtual_gpio_init();
 976 #endif
 977
 978         return res;
 979 }
 980
 981 /* this makes sure that gpio_init is called during kernel boot */
 982
 983 module_init(gpio_init);