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