arch/arm/plat-orion/gpio.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
GPIO_OUT
GPIO_IO_CONF
GPIO_BLINK_EN
GPIO_IN_POL
GPIO_DATA_IN
GPIO_EDGE_CAUSE
GPIO_EDGE_MASK
GPIO_LEVEL_MASK
__set_direction
__set_level
__set_blinking
orion_gpio_is_valid
orion_gpio_request
orion_gpio_direction_input
orion_gpio_get
orion_gpio_direction_output
orion_gpio_set
orion_gpio_to_irq
orion_gpio_chip_find
orion_gpio_set_unused
orion_gpio_set_valid
orion_gpio_set_blink
orion_gpio_led_blink_set
gpio_irq_set_type
gpio_irq_handler
orion_gpio_dbg_show
orion_gpio_unmask_irq
orion_gpio_mask_irq
orion_gpio_init
   1 /*
   2  * arch/arm/plat-orion/gpio.c
   3  *
   4  * Marvell Orion SoC GPIO handling.
   5  *
   6  * This file is licensed under the terms of the GNU General Public
   7  * License version 2.  This program is licensed "as is" without any
   8  * warranty of any kind, whether express or implied.
   9  */
  10 
  11 #define DEBUG
  12 
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/irq.h>
  16 #include <linux/irqdomain.h>
  17 #include <linux/module.h>
  18 #include <linux/spinlock.h>
  19 #include <linux/bitops.h>
  20 #include <linux/io.h>
  21 #include <linux/gpio.h>
  22 #include <linux/leds.h>
  23 #include <linux/of.h>
  24 #include <linux/of_irq.h>
  25 #include <linux/of_address.h>
  26 #include <plat/orion-gpio.h>
  27 
  28 /*
  29  * GPIO unit register offsets.
  30  */
  31 #define GPIO_OUT_OFF            0x0000
  32 #define GPIO_IO_CONF_OFF        0x0004
  33 #define GPIO_BLINK_EN_OFF       0x0008
  34 #define GPIO_IN_POL_OFF         0x000c
  35 #define GPIO_DATA_IN_OFF        0x0010
  36 #define GPIO_EDGE_CAUSE_OFF     0x0014
  37 #define GPIO_EDGE_MASK_OFF      0x0018
  38 #define GPIO_LEVEL_MASK_OFF     0x001c
  39 
  40 struct orion_gpio_chip {
  41         struct gpio_chip        chip;
  42         spinlock_t              lock;
  43         void __iomem            *base;
  44         unsigned long           valid_input;
  45         unsigned long           valid_output;
  46         int                     mask_offset;
  47         int                     secondary_irq_base;
  48         struct irq_domain       *domain;
  49 };
  50 
  51 static void __iomem *GPIO_OUT(struct orion_gpio_chip *ochip)
  52 {
  53         return ochip->base + GPIO_OUT_OFF;
  54 }
  55 
  56 static void __iomem *GPIO_IO_CONF(struct orion_gpio_chip *ochip)
  57 {
  58         return ochip->base + GPIO_IO_CONF_OFF;
  59 }
  60 
  61 static void __iomem *GPIO_BLINK_EN(struct orion_gpio_chip *ochip)
  62 {
  63         return ochip->base + GPIO_BLINK_EN_OFF;
  64 }
  65 
  66 static void __iomem *GPIO_IN_POL(struct orion_gpio_chip *ochip)
  67 {
  68         return ochip->base + GPIO_IN_POL_OFF;
  69 }
  70 
  71 static void __iomem *GPIO_DATA_IN(struct orion_gpio_chip *ochip)
  72 {
  73         return ochip->base + GPIO_DATA_IN_OFF;
  74 }
  75 
  76 static void __iomem *GPIO_EDGE_CAUSE(struct orion_gpio_chip *ochip)
  77 {
  78         return ochip->base + GPIO_EDGE_CAUSE_OFF;
  79 }
  80 
  81 static void __iomem *GPIO_EDGE_MASK(struct orion_gpio_chip *ochip)
  82 {
  83         return ochip->base + ochip->mask_offset + GPIO_EDGE_MASK_OFF;
  84 }
  85 
  86 static void __iomem *GPIO_LEVEL_MASK(struct orion_gpio_chip *ochip)
  87 {
  88         return ochip->base + ochip->mask_offset + GPIO_LEVEL_MASK_OFF;
  89 }
  90 
  91 
  92 static struct orion_gpio_chip orion_gpio_chips[2];
  93 static int orion_gpio_chip_count;
  94 
  95 static inline void
  96 __set_direction(struct orion_gpio_chip *ochip, unsigned pin, int input)
  97 {
  98         u32 u;
  99 
 100         u = readl(GPIO_IO_CONF(ochip));
 101         if (input)
 102                 u |= 1 << pin;
 103         else
 104                 u &= ~(1 << pin);
 105         writel(u, GPIO_IO_CONF(ochip));
 106 }
 107 
 108 static void __set_level(struct orion_gpio_chip *ochip, unsigned pin, int high)
 109 {
 110         u32 u;
 111 
 112         u = readl(GPIO_OUT(ochip));
 113         if (high)
 114                 u |= 1 << pin;
 115         else
 116                 u &= ~(1 << pin);
 117         writel(u, GPIO_OUT(ochip));
 118 }
 119 
 120 static inline void
 121 __set_blinking(struct orion_gpio_chip *ochip, unsigned pin, int blink)
 122 {
 123         u32 u;
 124 
 125         u = readl(GPIO_BLINK_EN(ochip));
 126         if (blink)
 127                 u |= 1 << pin;
 128         else
 129                 u &= ~(1 << pin);
 130         writel(u, GPIO_BLINK_EN(ochip));
 131 }
 132 
 133 static inline int
 134 orion_gpio_is_valid(struct orion_gpio_chip *ochip, unsigned pin, int mode)
 135 {
 136         if (pin >= ochip->chip.ngpio)
 137                 goto err_out;
 138 
 139         if ((mode & GPIO_INPUT_OK) && !test_bit(pin, &ochip->valid_input))
 140                 goto err_out;
 141 
 142         if ((mode & GPIO_OUTPUT_OK) && !test_bit(pin, &ochip->valid_output))
 143                 goto err_out;
 144 
 145         return 1;
 146 
 147 err_out:
 148         pr_debug("%s: invalid GPIO %d\n", __func__, pin);
 149         return false;
 150 }
 151 
 152 /*
 153  * GPIO primitives.
 154  */
 155 static int orion_gpio_request(struct gpio_chip *chip, unsigned pin)
 156 {
 157         struct orion_gpio_chip *ochip = gpiochip_get_data(chip);
 158 
 159         if (orion_gpio_is_valid(ochip, pin, GPIO_INPUT_OK) ||
 160             orion_gpio_is_valid(ochip, pin, GPIO_OUTPUT_OK))
 161                 return 0;
 162 
 163         return -EINVAL;
 164 }
 165 
 166 static int orion_gpio_direction_input(struct gpio_chip *chip, unsigned pin)
 167 {
 168         struct orion_gpio_chip *ochip = gpiochip_get_data(chip);
 169         unsigned long flags;
 170 
 171         if (!orion_gpio_is_valid(ochip, pin, GPIO_INPUT_OK))
 172                 return -EINVAL;
 173 
 174         spin_lock_irqsave(&ochip->lock, flags);
 175         __set_direction(ochip, pin, 1);
 176         spin_unlock_irqrestore(&ochip->lock, flags);
 177 
 178         return 0;
 179 }
 180 
 181 static int orion_gpio_get(struct gpio_chip *chip, unsigned pin)
 182 {
 183         struct orion_gpio_chip *ochip = gpiochip_get_data(chip);
 184         int val;
 185 
 186         if (readl(GPIO_IO_CONF(ochip)) & (1 << pin)) {
 187                 val = readl(GPIO_DATA_IN(ochip)) ^ readl(GPIO_IN_POL(ochip));
 188         } else {
 189                 val = readl(GPIO_OUT(ochip));
 190         }
 191 
 192         return (val >> pin) & 1;
 193 }
 194 
 195 static int
 196 orion_gpio_direction_output(struct gpio_chip *chip, unsigned pin, int value)
 197 {
 198         struct orion_gpio_chip *ochip = gpiochip_get_data(chip);
 199         unsigned long flags;
 200 
 201         if (!orion_gpio_is_valid(ochip, pin, GPIO_OUTPUT_OK))
 202                 return -EINVAL;
 203 
 204         spin_lock_irqsave(&ochip->lock, flags);
 205         __set_blinking(ochip, pin, 0);
 206         __set_level(ochip, pin, value);
 207         __set_direction(ochip, pin, 0);
 208         spin_unlock_irqrestore(&ochip->lock, flags);
 209 
 210         return 0;
 211 }
 212 
 213 static void orion_gpio_set(struct gpio_chip *chip, unsigned pin, int value)
 214 {
 215         struct orion_gpio_chip *ochip = gpiochip_get_data(chip);
 216         unsigned long flags;
 217 
 218         spin_lock_irqsave(&ochip->lock, flags);
 219         __set_level(ochip, pin, value);
 220         spin_unlock_irqrestore(&ochip->lock, flags);
 221 }
 222 
 223 static int orion_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
 224 {
 225         struct orion_gpio_chip *ochip = gpiochip_get_data(chip);
 226 
 227         return irq_create_mapping(ochip->domain,
 228                                   ochip->secondary_irq_base + pin);
 229 }
 230 
 231 /*
 232  * Orion-specific GPIO API extensions.
 233  */
 234 static struct orion_gpio_chip *orion_gpio_chip_find(int pin)
 235 {
 236         int i;
 237 
 238         for (i = 0; i < orion_gpio_chip_count; i++) {
 239                 struct orion_gpio_chip *ochip = orion_gpio_chips + i;
 240                 struct gpio_chip *chip = &ochip->chip;
 241 
 242                 if (pin >= chip->base && pin < chip->base + chip->ngpio)
 243                         return ochip;
 244         }
 245 
 246         return NULL;
 247 }
 248 
 249 void __init orion_gpio_set_unused(unsigned pin)
 250 {
 251         struct orion_gpio_chip *ochip = orion_gpio_chip_find(pin);
 252 
 253         if (ochip == NULL)
 254                 return;
 255 
 256         pin -= ochip->chip.base;
 257 
 258         /* Configure as output, drive low. */
 259         __set_level(ochip, pin, 0);
 260         __set_direction(ochip, pin, 0);
 261 }
 262 
 263 void __init orion_gpio_set_valid(unsigned pin, int mode)
 264 {
 265         struct orion_gpio_chip *ochip = orion_gpio_chip_find(pin);
 266 
 267         if (ochip == NULL)
 268                 return;
 269 
 270         pin -= ochip->chip.base;
 271 
 272         if (mode == 1)
 273                 mode = GPIO_INPUT_OK | GPIO_OUTPUT_OK;
 274 
 275         if (mode & GPIO_INPUT_OK)
 276                 __set_bit(pin, &ochip->valid_input);
 277         else
 278                 __clear_bit(pin, &ochip->valid_input);
 279 
 280         if (mode & GPIO_OUTPUT_OK)
 281                 __set_bit(pin, &ochip->valid_output);
 282         else
 283                 __clear_bit(pin, &ochip->valid_output);
 284 }
 285 
 286 void orion_gpio_set_blink(unsigned pin, int blink)
 287 {
 288         struct orion_gpio_chip *ochip = orion_gpio_chip_find(pin);
 289         unsigned long flags;
 290 
 291         if (ochip == NULL)
 292                 return;
 293 
 294         spin_lock_irqsave(&ochip->lock, flags);
 295         __set_level(ochip, pin & 31, 0);
 296         __set_blinking(ochip, pin & 31, blink);
 297         spin_unlock_irqrestore(&ochip->lock, flags);
 298 }
 299 EXPORT_SYMBOL(orion_gpio_set_blink);
 300 
 301 #define ORION_BLINK_HALF_PERIOD 100 /* ms */
 302 
 303 int orion_gpio_led_blink_set(struct gpio_desc *desc, int state,
 304         unsigned long *delay_on, unsigned long *delay_off)
 305 {
 306         unsigned gpio = desc_to_gpio(desc);
 307 
 308         if (delay_on && delay_off && !*delay_on && !*delay_off)
 309                 *delay_on = *delay_off = ORION_BLINK_HALF_PERIOD;
 310 
 311         switch (state) {
 312         case GPIO_LED_NO_BLINK_LOW:
 313         case GPIO_LED_NO_BLINK_HIGH:
 314                 orion_gpio_set_blink(gpio, 0);
 315                 gpio_set_value(gpio, state);
 316                 break;
 317         case GPIO_LED_BLINK:
 318                 orion_gpio_set_blink(gpio, 1);
 319         }
 320         return 0;
 321 }
 322 EXPORT_SYMBOL_GPL(orion_gpio_led_blink_set);
 323 
 324 
 325 /*****************************************************************************
 326  * Orion GPIO IRQ
 327  *
 328  * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
 329  * value of the line or the opposite value.
 330  *
 331  * Level IRQ handlers: DATA_IN is used directly as cause register.
 332  *                     Interrupt are masked by LEVEL_MASK registers.
 333  * Edge IRQ handlers:  Change in DATA_IN are latched in EDGE_CAUSE.
 334  *                     Interrupt are masked by EDGE_MASK registers.
 335  * Both-edge handlers: Similar to regular Edge handlers, but also swaps
 336  *                     the polarity to catch the next line transaction.
 337  *                     This is a race condition that might not perfectly
 338  *                     work on some use cases.
 339  *
 340  * Every eight GPIO lines are grouped (OR'ed) before going up to main
 341  * cause register.
 342  *
 343  *                    EDGE  cause    mask
 344  *        data-in   /--------| |-----| |----\
 345  *     -----| |-----                         ---- to main cause reg
 346  *           X      \----------------| |----/
 347  *        polarity    LEVEL          mask
 348  *
 349  ****************************************************************************/
 350 
 351 static int gpio_irq_set_type(struct irq_data *d, u32 type)
 352 {
 353         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 354         struct irq_chip_type *ct = irq_data_get_chip_type(d);
 355         struct orion_gpio_chip *ochip = gc->private;
 356         int pin;
 357         u32 u;
 358 
 359         pin = d->hwirq - ochip->secondary_irq_base;
 360 
 361         u = readl(GPIO_IO_CONF(ochip)) & (1 << pin);
 362         if (!u) {
 363                 return -EINVAL;
 364         }
 365 
 366         type &= IRQ_TYPE_SENSE_MASK;
 367         if (type == IRQ_TYPE_NONE)
 368                 return -EINVAL;
 369 
 370         /* Check if we need to change chip and handler */
 371         if (!(ct->type & type))
 372                 if (irq_setup_alt_chip(d, type))
 373                         return -EINVAL;
 374 
 375         /*
 376          * Configure interrupt polarity.
 377          */
 378         if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH) {
 379                 u = readl(GPIO_IN_POL(ochip));
 380                 u &= ~(1 << pin);
 381                 writel(u, GPIO_IN_POL(ochip));
 382         } else if (type == IRQ_TYPE_EDGE_FALLING || type == IRQ_TYPE_LEVEL_LOW) {
 383                 u = readl(GPIO_IN_POL(ochip));
 384                 u |= 1 << pin;
 385                 writel(u, GPIO_IN_POL(ochip));
 386         } else if (type == IRQ_TYPE_EDGE_BOTH) {
 387                 u32 v;
 388 
 389                 v = readl(GPIO_IN_POL(ochip)) ^ readl(GPIO_DATA_IN(ochip));
 390 
 391                 /*
 392                  * set initial polarity based on current input level
 393                  */
 394                 u = readl(GPIO_IN_POL(ochip));
 395                 if (v & (1 << pin))
 396                         u |= 1 << pin;          /* falling */
 397                 else
 398                         u &= ~(1 << pin);       /* rising */
 399                 writel(u, GPIO_IN_POL(ochip));
 400         }
 401         return 0;
 402 }
 403 
 404 static void gpio_irq_handler(struct irq_desc *desc)
 405 {
 406         struct orion_gpio_chip *ochip = irq_desc_get_handler_data(desc);
 407         u32 cause, type;
 408         int i;
 409 
 410         if (ochip == NULL)
 411                 return;
 412 
 413         cause = readl(GPIO_DATA_IN(ochip)) & readl(GPIO_LEVEL_MASK(ochip));
 414         cause |= readl(GPIO_EDGE_CAUSE(ochip)) & readl(GPIO_EDGE_MASK(ochip));
 415 
 416         for (i = 0; i < ochip->chip.ngpio; i++) {
 417                 int irq;
 418 
 419                 irq = ochip->secondary_irq_base + i;
 420 
 421                 if (!(cause & (1 << i)))
 422                         continue;
 423 
 424                 type = irq_get_trigger_type(irq);
 425                 if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
 426                         /* Swap polarity (race with GPIO line) */
 427                         u32 polarity;
 428 
 429                         polarity = readl(GPIO_IN_POL(ochip));
 430                         polarity ^= 1 << i;
 431                         writel(polarity, GPIO_IN_POL(ochip));
 432                 }
 433                 generic_handle_irq(irq);
 434         }
 435 }
 436 
 437 #ifdef CONFIG_DEBUG_FS
 438 #include <linux/seq_file.h>
 439 
 440 static void orion_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 441 {
 442 
 443         struct orion_gpio_chip *ochip = gpiochip_get_data(chip);
 444         u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk;
 445         int i;
 446 
 447         out     = readl_relaxed(GPIO_OUT(ochip));
 448         io_conf = readl_relaxed(GPIO_IO_CONF(ochip));
 449         blink   = readl_relaxed(GPIO_BLINK_EN(ochip));
 450         in_pol  = readl_relaxed(GPIO_IN_POL(ochip));
 451         data_in = readl_relaxed(GPIO_DATA_IN(ochip));
 452         cause   = readl_relaxed(GPIO_EDGE_CAUSE(ochip));
 453         edg_msk = readl_relaxed(GPIO_EDGE_MASK(ochip));
 454         lvl_msk = readl_relaxed(GPIO_LEVEL_MASK(ochip));
 455 
 456         for (i = 0; i < chip->ngpio; i++) {
 457                 const char *label;
 458                 u32 msk;
 459                 bool is_out;
 460 
 461                 label = gpiochip_is_requested(chip, i);
 462                 if (!label)
 463                         continue;
 464 
 465                 msk = 1 << i;
 466                 is_out = !(io_conf & msk);
 467 
 468                 seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label);
 469 
 470                 if (is_out) {
 471                         seq_printf(s, " out %s %s\n",
 472                                    out & msk ? "hi" : "lo",
 473                                    blink & msk ? "(blink )" : "");
 474                         continue;
 475                 }
 476 
 477                 seq_printf(s, " in  %s (act %s) - IRQ",
 478                            (data_in ^ in_pol) & msk  ? "hi" : "lo",
 479                            in_pol & msk ? "lo" : "hi");
 480                 if (!((edg_msk | lvl_msk) & msk)) {
 481                         seq_puts(s, " disabled\n");
 482                         continue;
 483                 }
 484                 if (edg_msk & msk)
 485                         seq_puts(s, " edge ");
 486                 if (lvl_msk & msk)
 487                         seq_puts(s, " level");
 488                 seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear  ");
 489         }
 490 }
 491 #else
 492 #define orion_gpio_dbg_show NULL
 493 #endif
 494 
 495 static void orion_gpio_unmask_irq(struct irq_data *d)
 496 {
 497         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 498         struct irq_chip_type *ct = irq_data_get_chip_type(d);
 499         u32 reg_val;
 500         u32 mask = d->mask;
 501 
 502         irq_gc_lock(gc);
 503         reg_val = irq_reg_readl(gc, ct->regs.mask);
 504         reg_val |= mask;
 505         irq_reg_writel(gc, reg_val, ct->regs.mask);
 506         irq_gc_unlock(gc);
 507 }
 508 
 509 static void orion_gpio_mask_irq(struct irq_data *d)
 510 {
 511         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 512         struct irq_chip_type *ct = irq_data_get_chip_type(d);
 513         u32 mask = d->mask;
 514         u32 reg_val;
 515 
 516         irq_gc_lock(gc);
 517         reg_val = irq_reg_readl(gc, ct->regs.mask);
 518         reg_val &= ~mask;
 519         irq_reg_writel(gc, reg_val, ct->regs.mask);
 520         irq_gc_unlock(gc);
 521 }
 522 
 523 void __init orion_gpio_init(struct device_node *np,
 524                             int gpio_base, int ngpio,
 525                             void __iomem *base, int mask_offset,
 526                             int secondary_irq_base,
 527                             int irqs[4])
 528 {
 529         struct orion_gpio_chip *ochip;
 530         struct irq_chip_generic *gc;
 531         struct irq_chip_type *ct;
 532         char gc_label[16];
 533         int i;
 534 
 535         if (orion_gpio_chip_count == ARRAY_SIZE(orion_gpio_chips))
 536                 return;
 537 
 538         snprintf(gc_label, sizeof(gc_label), "orion_gpio%d",
 539                 orion_gpio_chip_count);
 540 
 541         ochip = orion_gpio_chips + orion_gpio_chip_count;
 542         ochip->chip.label = kstrdup(gc_label, GFP_KERNEL);
 543         ochip->chip.request = orion_gpio_request;
 544         ochip->chip.direction_input = orion_gpio_direction_input;
 545         ochip->chip.get = orion_gpio_get;
 546         ochip->chip.direction_output = orion_gpio_direction_output;
 547         ochip->chip.set = orion_gpio_set;
 548         ochip->chip.to_irq = orion_gpio_to_irq;
 549         ochip->chip.base = gpio_base;
 550         ochip->chip.ngpio = ngpio;
 551         ochip->chip.can_sleep = 0;
 552 #ifdef CONFIG_OF
 553         ochip->chip.of_node = np;
 554 #endif
 555         ochip->chip.dbg_show = orion_gpio_dbg_show;
 556 
 557         spin_lock_init(&ochip->lock);
 558         ochip->base = (void __iomem *)base;
 559         ochip->valid_input = 0;
 560         ochip->valid_output = 0;
 561         ochip->mask_offset = mask_offset;
 562         ochip->secondary_irq_base = secondary_irq_base;
 563 
 564         gpiochip_add_data(&ochip->chip, ochip);
 565 
 566         /*
 567          * Mask and clear GPIO interrupts.
 568          */
 569         writel(0, GPIO_EDGE_CAUSE(ochip));
 570         writel(0, GPIO_EDGE_MASK(ochip));
 571         writel(0, GPIO_LEVEL_MASK(ochip));
 572 
 573         /* Setup the interrupt handlers. Each chip can have up to 4
 574          * interrupt handlers, with each handler dealing with 8 GPIO
 575          * pins. */
 576 
 577         for (i = 0; i < 4; i++) {
 578                 if (irqs[i]) {
 579                         irq_set_chained_handler_and_data(irqs[i],
 580                                                          gpio_irq_handler,
 581                                                          ochip);
 582                 }
 583         }
 584 
 585         gc = irq_alloc_generic_chip("orion_gpio_irq", 2,
 586                                     secondary_irq_base,
 587                                     ochip->base, handle_level_irq);
 588         gc->private = ochip;
 589         ct = gc->chip_types;
 590         ct->regs.mask = ochip->mask_offset + GPIO_LEVEL_MASK_OFF;
 591         ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
 592         ct->chip.irq_mask = orion_gpio_mask_irq;
 593         ct->chip.irq_unmask = orion_gpio_unmask_irq;
 594         ct->chip.irq_set_type = gpio_irq_set_type;
 595         ct->chip.name = ochip->chip.label;
 596 
 597         ct++;
 598         ct->regs.mask = ochip->mask_offset + GPIO_EDGE_MASK_OFF;
 599         ct->regs.ack = GPIO_EDGE_CAUSE_OFF;
 600         ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
 601         ct->chip.irq_ack = irq_gc_ack_clr_bit;
 602         ct->chip.irq_mask = orion_gpio_mask_irq;
 603         ct->chip.irq_unmask = orion_gpio_unmask_irq;
 604         ct->chip.irq_set_type = gpio_irq_set_type;
 605         ct->handler = handle_edge_irq;
 606         ct->chip.name = ochip->chip.label;
 607 
 608         irq_setup_generic_chip(gc, IRQ_MSK(ngpio), IRQ_GC_INIT_MASK_CACHE,
 609                                IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
 610 
 611         /* Setup irq domain on top of the generic chip. */
 612         ochip->domain = irq_domain_add_legacy(np,
 613                                               ochip->chip.ngpio,
 614                                               ochip->secondary_irq_base,
 615                                               ochip->secondary_irq_base,
 616                                               &irq_domain_simple_ops,
 617                                               ochip);
 618         if (!ochip->domain)
 619                 panic("%s: couldn't allocate irq domain (DT).\n",
 620                       ochip->chip.label);
 621 
 622         orion_gpio_chip_count++;
 623 }
/* [<][>][^][v][top][bottom][index][help] */
root/arch/arm/plat-orion/gpio.c

DEFINITIONS
