root/drivers/gpio/gpio-tegra.c

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DEFINITIONS

This source file includes following definitions.
  1. tegra_gpio_writel
  2. tegra_gpio_readl
  3. tegra_gpio_compose
  4. tegra_gpio_mask_write
  5. tegra_gpio_enable
  6. tegra_gpio_disable
  7. tegra_gpio_request
  8. tegra_gpio_free
  9. tegra_gpio_set
  10. tegra_gpio_get
  11. tegra_gpio_direction_input
  12. tegra_gpio_direction_output
  13. tegra_gpio_get_direction
  14. tegra_gpio_set_debounce
  15. tegra_gpio_set_config
  16. tegra_gpio_to_irq
  17. tegra_gpio_irq_ack
  18. tegra_gpio_irq_mask
  19. tegra_gpio_irq_unmask
  20. tegra_gpio_irq_set_type
  21. tegra_gpio_irq_shutdown
  22. tegra_gpio_irq_handler
  23. tegra_gpio_resume
  24. tegra_gpio_suspend
  25. tegra_gpio_irq_set_wake
  26. tegra_dbg_gpio_show
  27. tegra_gpio_debuginit
  28. tegra_gpio_debuginit
  29. tegra_gpio_probe
  30. tegra_gpio_init

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arch/arm/mach-tegra/gpio.c
   4  *
   5  * Copyright (c) 2010 Google, Inc
   6  * Copyright (c) 2011-2016, NVIDIA CORPORATION.  All rights reserved.
   7  *
   8  * Author:
   9  *      Erik Gilling <konkers@google.com>
  10  */
  11 
  12 #include <linux/err.h>
  13 #include <linux/init.h>
  14 #include <linux/irq.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/io.h>
  17 #include <linux/gpio/driver.h>
  18 #include <linux/of_device.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/module.h>
  21 #include <linux/irqdomain.h>
  22 #include <linux/irqchip/chained_irq.h>
  23 #include <linux/pinctrl/consumer.h>
  24 #include <linux/pm.h>
  25 
  26 #define GPIO_BANK(x)            ((x) >> 5)
  27 #define GPIO_PORT(x)            (((x) >> 3) & 0x3)
  28 #define GPIO_BIT(x)             ((x) & 0x7)
  29 
  30 #define GPIO_REG(tgi, x)        (GPIO_BANK(x) * tgi->soc->bank_stride + \
  31                                         GPIO_PORT(x) * 4)
  32 
  33 #define GPIO_CNF(t, x)          (GPIO_REG(t, x) + 0x00)
  34 #define GPIO_OE(t, x)           (GPIO_REG(t, x) + 0x10)
  35 #define GPIO_OUT(t, x)          (GPIO_REG(t, x) + 0X20)
  36 #define GPIO_IN(t, x)           (GPIO_REG(t, x) + 0x30)
  37 #define GPIO_INT_STA(t, x)      (GPIO_REG(t, x) + 0x40)
  38 #define GPIO_INT_ENB(t, x)      (GPIO_REG(t, x) + 0x50)
  39 #define GPIO_INT_LVL(t, x)      (GPIO_REG(t, x) + 0x60)
  40 #define GPIO_INT_CLR(t, x)      (GPIO_REG(t, x) + 0x70)
  41 #define GPIO_DBC_CNT(t, x)      (GPIO_REG(t, x) + 0xF0)
  42 
  43 
  44 #define GPIO_MSK_CNF(t, x)      (GPIO_REG(t, x) + t->soc->upper_offset + 0x00)
  45 #define GPIO_MSK_OE(t, x)       (GPIO_REG(t, x) + t->soc->upper_offset + 0x10)
  46 #define GPIO_MSK_OUT(t, x)      (GPIO_REG(t, x) + t->soc->upper_offset + 0X20)
  47 #define GPIO_MSK_DBC_EN(t, x)   (GPIO_REG(t, x) + t->soc->upper_offset + 0x30)
  48 #define GPIO_MSK_INT_STA(t, x)  (GPIO_REG(t, x) + t->soc->upper_offset + 0x40)
  49 #define GPIO_MSK_INT_ENB(t, x)  (GPIO_REG(t, x) + t->soc->upper_offset + 0x50)
  50 #define GPIO_MSK_INT_LVL(t, x)  (GPIO_REG(t, x) + t->soc->upper_offset + 0x60)
  51 
  52 #define GPIO_INT_LVL_MASK               0x010101
  53 #define GPIO_INT_LVL_EDGE_RISING        0x000101
  54 #define GPIO_INT_LVL_EDGE_FALLING       0x000100
  55 #define GPIO_INT_LVL_EDGE_BOTH          0x010100
  56 #define GPIO_INT_LVL_LEVEL_HIGH         0x000001
  57 #define GPIO_INT_LVL_LEVEL_LOW          0x000000
  58 
  59 struct tegra_gpio_info;
  60 
  61 struct tegra_gpio_bank {
  62         unsigned int bank;
  63         unsigned int irq;
  64         spinlock_t lvl_lock[4];
  65         spinlock_t dbc_lock[4]; /* Lock for updating debounce count register */
  66 #ifdef CONFIG_PM_SLEEP
  67         u32 cnf[4];
  68         u32 out[4];
  69         u32 oe[4];
  70         u32 int_enb[4];
  71         u32 int_lvl[4];
  72         u32 wake_enb[4];
  73         u32 dbc_enb[4];
  74 #endif
  75         u32 dbc_cnt[4];
  76         struct tegra_gpio_info *tgi;
  77 };
  78 
  79 struct tegra_gpio_soc_config {
  80         bool debounce_supported;
  81         u32 bank_stride;
  82         u32 upper_offset;
  83 };
  84 
  85 struct tegra_gpio_info {
  86         struct device                           *dev;
  87         void __iomem                            *regs;
  88         struct irq_domain                       *irq_domain;
  89         struct tegra_gpio_bank                  *bank_info;
  90         const struct tegra_gpio_soc_config      *soc;
  91         struct gpio_chip                        gc;
  92         struct irq_chip                         ic;
  93         u32                                     bank_count;
  94 };
  95 
  96 static inline void tegra_gpio_writel(struct tegra_gpio_info *tgi,
  97                                      u32 val, u32 reg)
  98 {
  99         __raw_writel(val, tgi->regs + reg);
 100 }
 101 
 102 static inline u32 tegra_gpio_readl(struct tegra_gpio_info *tgi, u32 reg)
 103 {
 104         return __raw_readl(tgi->regs + reg);
 105 }
 106 
 107 static unsigned int tegra_gpio_compose(unsigned int bank, unsigned int port,
 108                                        unsigned int bit)
 109 {
 110         return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7);
 111 }
 112 
 113 static void tegra_gpio_mask_write(struct tegra_gpio_info *tgi, u32 reg,
 114                                   unsigned int gpio, u32 value)
 115 {
 116         u32 val;
 117 
 118         val = 0x100 << GPIO_BIT(gpio);
 119         if (value)
 120                 val |= 1 << GPIO_BIT(gpio);
 121         tegra_gpio_writel(tgi, val, reg);
 122 }
 123 
 124 static void tegra_gpio_enable(struct tegra_gpio_info *tgi, unsigned int gpio)
 125 {
 126         tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 1);
 127 }
 128 
 129 static void tegra_gpio_disable(struct tegra_gpio_info *tgi, unsigned int gpio)
 130 {
 131         tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 0);
 132 }
 133 
 134 static int tegra_gpio_request(struct gpio_chip *chip, unsigned int offset)
 135 {
 136         return pinctrl_gpio_request(chip->base + offset);
 137 }
 138 
 139 static void tegra_gpio_free(struct gpio_chip *chip, unsigned int offset)
 140 {
 141         struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
 142 
 143         pinctrl_gpio_free(chip->base + offset);
 144         tegra_gpio_disable(tgi, offset);
 145 }
 146 
 147 static void tegra_gpio_set(struct gpio_chip *chip, unsigned int offset,
 148                            int value)
 149 {
 150         struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
 151 
 152         tegra_gpio_mask_write(tgi, GPIO_MSK_OUT(tgi, offset), offset, value);
 153 }
 154 
 155 static int tegra_gpio_get(struct gpio_chip *chip, unsigned int offset)
 156 {
 157         struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
 158         unsigned int bval = BIT(GPIO_BIT(offset));
 159 
 160         /* If gpio is in output mode then read from the out value */
 161         if (tegra_gpio_readl(tgi, GPIO_OE(tgi, offset)) & bval)
 162                 return !!(tegra_gpio_readl(tgi, GPIO_OUT(tgi, offset)) & bval);
 163 
 164         return !!(tegra_gpio_readl(tgi, GPIO_IN(tgi, offset)) & bval);
 165 }
 166 
 167 static int tegra_gpio_direction_input(struct gpio_chip *chip,
 168                                       unsigned int offset)
 169 {
 170         struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
 171         int ret;
 172 
 173         tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 0);
 174         tegra_gpio_enable(tgi, offset);
 175 
 176         ret = pinctrl_gpio_direction_input(chip->base + offset);
 177         if (ret < 0)
 178                 dev_err(tgi->dev,
 179                         "Failed to set pinctrl input direction of GPIO %d: %d",
 180                          chip->base + offset, ret);
 181 
 182         return ret;
 183 }
 184 
 185 static int tegra_gpio_direction_output(struct gpio_chip *chip,
 186                                        unsigned int offset,
 187                                        int value)
 188 {
 189         struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
 190         int ret;
 191 
 192         tegra_gpio_set(chip, offset, value);
 193         tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 1);
 194         tegra_gpio_enable(tgi, offset);
 195 
 196         ret = pinctrl_gpio_direction_output(chip->base + offset);
 197         if (ret < 0)
 198                 dev_err(tgi->dev,
 199                         "Failed to set pinctrl output direction of GPIO %d: %d",
 200                          chip->base + offset, ret);
 201 
 202         return ret;
 203 }
 204 
 205 static int tegra_gpio_get_direction(struct gpio_chip *chip,
 206                                     unsigned int offset)
 207 {
 208         struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
 209         u32 pin_mask = BIT(GPIO_BIT(offset));
 210         u32 cnf, oe;
 211 
 212         cnf = tegra_gpio_readl(tgi, GPIO_CNF(tgi, offset));
 213         if (!(cnf & pin_mask))
 214                 return -EINVAL;
 215 
 216         oe = tegra_gpio_readl(tgi, GPIO_OE(tgi, offset));
 217 
 218         return !(oe & pin_mask);
 219 }
 220 
 221 static int tegra_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset,
 222                                    unsigned int debounce)
 223 {
 224         struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
 225         struct tegra_gpio_bank *bank = &tgi->bank_info[GPIO_BANK(offset)];
 226         unsigned int debounce_ms = DIV_ROUND_UP(debounce, 1000);
 227         unsigned long flags;
 228         unsigned int port;
 229 
 230         if (!debounce_ms) {
 231                 tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset),
 232                                       offset, 0);
 233                 return 0;
 234         }
 235 
 236         debounce_ms = min(debounce_ms, 255U);
 237         port = GPIO_PORT(offset);
 238 
 239         /* There is only one debounce count register per port and hence
 240          * set the maximum of current and requested debounce time.
 241          */
 242         spin_lock_irqsave(&bank->dbc_lock[port], flags);
 243         if (bank->dbc_cnt[port] < debounce_ms) {
 244                 tegra_gpio_writel(tgi, debounce_ms, GPIO_DBC_CNT(tgi, offset));
 245                 bank->dbc_cnt[port] = debounce_ms;
 246         }
 247         spin_unlock_irqrestore(&bank->dbc_lock[port], flags);
 248 
 249         tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset), offset, 1);
 250 
 251         return 0;
 252 }
 253 
 254 static int tegra_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
 255                                  unsigned long config)
 256 {
 257         u32 debounce;
 258 
 259         if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
 260                 return -ENOTSUPP;
 261 
 262         debounce = pinconf_to_config_argument(config);
 263         return tegra_gpio_set_debounce(chip, offset, debounce);
 264 }
 265 
 266 static int tegra_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
 267 {
 268         struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
 269 
 270         return irq_find_mapping(tgi->irq_domain, offset);
 271 }
 272 
 273 static void tegra_gpio_irq_ack(struct irq_data *d)
 274 {
 275         struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
 276         struct tegra_gpio_info *tgi = bank->tgi;
 277         unsigned int gpio = d->hwirq;
 278 
 279         tegra_gpio_writel(tgi, 1 << GPIO_BIT(gpio), GPIO_INT_CLR(tgi, gpio));
 280 }
 281 
 282 static void tegra_gpio_irq_mask(struct irq_data *d)
 283 {
 284         struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
 285         struct tegra_gpio_info *tgi = bank->tgi;
 286         unsigned int gpio = d->hwirq;
 287 
 288         tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 0);
 289 }
 290 
 291 static void tegra_gpio_irq_unmask(struct irq_data *d)
 292 {
 293         struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
 294         struct tegra_gpio_info *tgi = bank->tgi;
 295         unsigned int gpio = d->hwirq;
 296 
 297         tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 1);
 298 }
 299 
 300 static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 301 {
 302         unsigned int gpio = d->hwirq, port = GPIO_PORT(gpio), lvl_type;
 303         struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
 304         struct tegra_gpio_info *tgi = bank->tgi;
 305         unsigned long flags;
 306         u32 val;
 307         int ret;
 308 
 309         switch (type & IRQ_TYPE_SENSE_MASK) {
 310         case IRQ_TYPE_EDGE_RISING:
 311                 lvl_type = GPIO_INT_LVL_EDGE_RISING;
 312                 break;
 313 
 314         case IRQ_TYPE_EDGE_FALLING:
 315                 lvl_type = GPIO_INT_LVL_EDGE_FALLING;
 316                 break;
 317 
 318         case IRQ_TYPE_EDGE_BOTH:
 319                 lvl_type = GPIO_INT_LVL_EDGE_BOTH;
 320                 break;
 321 
 322         case IRQ_TYPE_LEVEL_HIGH:
 323                 lvl_type = GPIO_INT_LVL_LEVEL_HIGH;
 324                 break;
 325 
 326         case IRQ_TYPE_LEVEL_LOW:
 327                 lvl_type = GPIO_INT_LVL_LEVEL_LOW;
 328                 break;
 329 
 330         default:
 331                 return -EINVAL;
 332         }
 333 
 334         spin_lock_irqsave(&bank->lvl_lock[port], flags);
 335 
 336         val = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio));
 337         val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio));
 338         val |= lvl_type << GPIO_BIT(gpio);
 339         tegra_gpio_writel(tgi, val, GPIO_INT_LVL(tgi, gpio));
 340 
 341         spin_unlock_irqrestore(&bank->lvl_lock[port], flags);
 342 
 343         tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, gpio), gpio, 0);
 344         tegra_gpio_enable(tgi, gpio);
 345 
 346         ret = gpiochip_lock_as_irq(&tgi->gc, gpio);
 347         if (ret) {
 348                 dev_err(tgi->dev,
 349                         "unable to lock Tegra GPIO %u as IRQ\n", gpio);
 350                 tegra_gpio_disable(tgi, gpio);
 351                 return ret;
 352         }
 353 
 354         if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
 355                 irq_set_handler_locked(d, handle_level_irq);
 356         else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
 357                 irq_set_handler_locked(d, handle_edge_irq);
 358 
 359         return 0;
 360 }
 361 
 362 static void tegra_gpio_irq_shutdown(struct irq_data *d)
 363 {
 364         struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
 365         struct tegra_gpio_info *tgi = bank->tgi;
 366         unsigned int gpio = d->hwirq;
 367 
 368         tegra_gpio_irq_mask(d);
 369         gpiochip_unlock_as_irq(&tgi->gc, gpio);
 370 }
 371 
 372 static void tegra_gpio_irq_handler(struct irq_desc *desc)
 373 {
 374         unsigned int port, pin, gpio;
 375         bool unmasked = false;
 376         u32 lvl;
 377         unsigned long sta;
 378         struct irq_chip *chip = irq_desc_get_chip(desc);
 379         struct tegra_gpio_bank *bank = irq_desc_get_handler_data(desc);
 380         struct tegra_gpio_info *tgi = bank->tgi;
 381 
 382         chained_irq_enter(chip, desc);
 383 
 384         for (port = 0; port < 4; port++) {
 385                 gpio = tegra_gpio_compose(bank->bank, port, 0);
 386                 sta = tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)) &
 387                         tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio));
 388                 lvl = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio));
 389 
 390                 for_each_set_bit(pin, &sta, 8) {
 391                         tegra_gpio_writel(tgi, 1 << pin,
 392                                           GPIO_INT_CLR(tgi, gpio));
 393 
 394                         /* if gpio is edge triggered, clear condition
 395                          * before executing the handler so that we don't
 396                          * miss edges
 397                          */
 398                         if (!unmasked && lvl & (0x100 << pin)) {
 399                                 unmasked = true;
 400                                 chained_irq_exit(chip, desc);
 401                         }
 402 
 403                         generic_handle_irq(irq_find_mapping(tgi->irq_domain,
 404                                                             gpio + pin));
 405                 }
 406         }
 407 
 408         if (!unmasked)
 409                 chained_irq_exit(chip, desc);
 410 
 411 }
 412 
 413 #ifdef CONFIG_PM_SLEEP
 414 static int tegra_gpio_resume(struct device *dev)
 415 {
 416         struct tegra_gpio_info *tgi = dev_get_drvdata(dev);
 417         unsigned long flags;
 418         unsigned int b, p;
 419 
 420         local_irq_save(flags);
 421 
 422         for (b = 0; b < tgi->bank_count; b++) {
 423                 struct tegra_gpio_bank *bank = &tgi->bank_info[b];
 424 
 425                 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
 426                         unsigned int gpio = (b << 5) | (p << 3);
 427 
 428                         tegra_gpio_writel(tgi, bank->cnf[p],
 429                                           GPIO_CNF(tgi, gpio));
 430 
 431                         if (tgi->soc->debounce_supported) {
 432                                 tegra_gpio_writel(tgi, bank->dbc_cnt[p],
 433                                                   GPIO_DBC_CNT(tgi, gpio));
 434                                 tegra_gpio_writel(tgi, bank->dbc_enb[p],
 435                                                   GPIO_MSK_DBC_EN(tgi, gpio));
 436                         }
 437 
 438                         tegra_gpio_writel(tgi, bank->out[p],
 439                                           GPIO_OUT(tgi, gpio));
 440                         tegra_gpio_writel(tgi, bank->oe[p],
 441                                           GPIO_OE(tgi, gpio));
 442                         tegra_gpio_writel(tgi, bank->int_lvl[p],
 443                                           GPIO_INT_LVL(tgi, gpio));
 444                         tegra_gpio_writel(tgi, bank->int_enb[p],
 445                                           GPIO_INT_ENB(tgi, gpio));
 446                 }
 447         }
 448 
 449         local_irq_restore(flags);
 450         return 0;
 451 }
 452 
 453 static int tegra_gpio_suspend(struct device *dev)
 454 {
 455         struct tegra_gpio_info *tgi = dev_get_drvdata(dev);
 456         unsigned long flags;
 457         unsigned int b, p;
 458 
 459         local_irq_save(flags);
 460         for (b = 0; b < tgi->bank_count; b++) {
 461                 struct tegra_gpio_bank *bank = &tgi->bank_info[b];
 462 
 463                 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
 464                         unsigned int gpio = (b << 5) | (p << 3);
 465 
 466                         bank->cnf[p] = tegra_gpio_readl(tgi,
 467                                                         GPIO_CNF(tgi, gpio));
 468                         bank->out[p] = tegra_gpio_readl(tgi,
 469                                                         GPIO_OUT(tgi, gpio));
 470                         bank->oe[p] = tegra_gpio_readl(tgi,
 471                                                        GPIO_OE(tgi, gpio));
 472                         if (tgi->soc->debounce_supported) {
 473                                 bank->dbc_enb[p] = tegra_gpio_readl(tgi,
 474                                                 GPIO_MSK_DBC_EN(tgi, gpio));
 475                                 bank->dbc_enb[p] = (bank->dbc_enb[p] << 8) |
 476                                                         bank->dbc_enb[p];
 477                         }
 478 
 479                         bank->int_enb[p] = tegra_gpio_readl(tgi,
 480                                                 GPIO_INT_ENB(tgi, gpio));
 481                         bank->int_lvl[p] = tegra_gpio_readl(tgi,
 482                                                 GPIO_INT_LVL(tgi, gpio));
 483 
 484                         /* Enable gpio irq for wake up source */
 485                         tegra_gpio_writel(tgi, bank->wake_enb[p],
 486                                           GPIO_INT_ENB(tgi, gpio));
 487                 }
 488         }
 489         local_irq_restore(flags);
 490         return 0;
 491 }
 492 
 493 static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable)
 494 {
 495         struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
 496         unsigned int gpio = d->hwirq;
 497         u32 port, bit, mask;
 498 
 499         port = GPIO_PORT(gpio);
 500         bit = GPIO_BIT(gpio);
 501         mask = BIT(bit);
 502 
 503         if (enable)
 504                 bank->wake_enb[port] |= mask;
 505         else
 506                 bank->wake_enb[port] &= ~mask;
 507 
 508         return irq_set_irq_wake(bank->irq, enable);
 509 }
 510 #endif
 511 
 512 #ifdef  CONFIG_DEBUG_FS
 513 
 514 #include <linux/debugfs.h>
 515 #include <linux/seq_file.h>
 516 
 517 static int tegra_dbg_gpio_show(struct seq_file *s, void *unused)
 518 {
 519         struct tegra_gpio_info *tgi = s->private;
 520         unsigned int i, j;
 521 
 522         for (i = 0; i < tgi->bank_count; i++) {
 523                 for (j = 0; j < 4; j++) {
 524                         unsigned int gpio = tegra_gpio_compose(i, j, 0);
 525 
 526                         seq_printf(s,
 527                                 "%u:%u %02x %02x %02x %02x %02x %02x %06x\n",
 528                                 i, j,
 529                                 tegra_gpio_readl(tgi, GPIO_CNF(tgi, gpio)),
 530                                 tegra_gpio_readl(tgi, GPIO_OE(tgi, gpio)),
 531                                 tegra_gpio_readl(tgi, GPIO_OUT(tgi, gpio)),
 532                                 tegra_gpio_readl(tgi, GPIO_IN(tgi, gpio)),
 533                                 tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)),
 534                                 tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio)),
 535                                 tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio)));
 536                 }
 537         }
 538         return 0;
 539 }
 540 
 541 DEFINE_SHOW_ATTRIBUTE(tegra_dbg_gpio);
 542 
 543 static void tegra_gpio_debuginit(struct tegra_gpio_info *tgi)
 544 {
 545         debugfs_create_file("tegra_gpio", 0444, NULL, tgi,
 546                             &tegra_dbg_gpio_fops);
 547 }
 548 
 549 #else
 550 
 551 static inline void tegra_gpio_debuginit(struct tegra_gpio_info *tgi)
 552 {
 553 }
 554 
 555 #endif
 556 
 557 static const struct dev_pm_ops tegra_gpio_pm_ops = {
 558         SET_SYSTEM_SLEEP_PM_OPS(tegra_gpio_suspend, tegra_gpio_resume)
 559 };
 560 
 561 static int tegra_gpio_probe(struct platform_device *pdev)
 562 {
 563         struct tegra_gpio_info *tgi;
 564         struct tegra_gpio_bank *bank;
 565         unsigned int gpio, i, j;
 566         int ret;
 567 
 568         tgi = devm_kzalloc(&pdev->dev, sizeof(*tgi), GFP_KERNEL);
 569         if (!tgi)
 570                 return -ENODEV;
 571 
 572         tgi->soc = of_device_get_match_data(&pdev->dev);
 573         tgi->dev = &pdev->dev;
 574 
 575         ret = platform_irq_count(pdev);
 576         if (ret < 0)
 577                 return ret;
 578 
 579         tgi->bank_count = ret;
 580 
 581         if (!tgi->bank_count) {
 582                 dev_err(&pdev->dev, "Missing IRQ resource\n");
 583                 return -ENODEV;
 584         }
 585 
 586         tgi->gc.label                   = "tegra-gpio";
 587         tgi->gc.request                 = tegra_gpio_request;
 588         tgi->gc.free                    = tegra_gpio_free;
 589         tgi->gc.direction_input         = tegra_gpio_direction_input;
 590         tgi->gc.get                     = tegra_gpio_get;
 591         tgi->gc.direction_output        = tegra_gpio_direction_output;
 592         tgi->gc.set                     = tegra_gpio_set;
 593         tgi->gc.get_direction           = tegra_gpio_get_direction;
 594         tgi->gc.to_irq                  = tegra_gpio_to_irq;
 595         tgi->gc.base                    = 0;
 596         tgi->gc.ngpio                   = tgi->bank_count * 32;
 597         tgi->gc.parent                  = &pdev->dev;
 598         tgi->gc.of_node                 = pdev->dev.of_node;
 599 
 600         tgi->ic.name                    = "GPIO";
 601         tgi->ic.irq_ack                 = tegra_gpio_irq_ack;
 602         tgi->ic.irq_mask                = tegra_gpio_irq_mask;
 603         tgi->ic.irq_unmask              = tegra_gpio_irq_unmask;
 604         tgi->ic.irq_set_type            = tegra_gpio_irq_set_type;
 605         tgi->ic.irq_shutdown            = tegra_gpio_irq_shutdown;
 606 #ifdef CONFIG_PM_SLEEP
 607         tgi->ic.irq_set_wake            = tegra_gpio_irq_set_wake;
 608 #endif
 609 
 610         platform_set_drvdata(pdev, tgi);
 611 
 612         if (tgi->soc->debounce_supported)
 613                 tgi->gc.set_config = tegra_gpio_set_config;
 614 
 615         tgi->bank_info = devm_kcalloc(&pdev->dev, tgi->bank_count,
 616                                       sizeof(*tgi->bank_info), GFP_KERNEL);
 617         if (!tgi->bank_info)
 618                 return -ENOMEM;
 619 
 620         tgi->irq_domain = irq_domain_add_linear(pdev->dev.of_node,
 621                                                 tgi->gc.ngpio,
 622                                                 &irq_domain_simple_ops, NULL);
 623         if (!tgi->irq_domain)
 624                 return -ENODEV;
 625 
 626         for (i = 0; i < tgi->bank_count; i++) {
 627                 ret = platform_get_irq(pdev, i);
 628                 if (ret < 0)
 629                         return ret;
 630 
 631                 bank = &tgi->bank_info[i];
 632                 bank->bank = i;
 633                 bank->irq = ret;
 634                 bank->tgi = tgi;
 635         }
 636 
 637         tgi->regs = devm_platform_ioremap_resource(pdev, 0);
 638         if (IS_ERR(tgi->regs))
 639                 return PTR_ERR(tgi->regs);
 640 
 641         for (i = 0; i < tgi->bank_count; i++) {
 642                 for (j = 0; j < 4; j++) {
 643                         int gpio = tegra_gpio_compose(i, j, 0);
 644 
 645                         tegra_gpio_writel(tgi, 0x00, GPIO_INT_ENB(tgi, gpio));
 646                 }
 647         }
 648 
 649         ret = devm_gpiochip_add_data(&pdev->dev, &tgi->gc, tgi);
 650         if (ret < 0) {
 651                 irq_domain_remove(tgi->irq_domain);
 652                 return ret;
 653         }
 654 
 655         for (gpio = 0; gpio < tgi->gc.ngpio; gpio++) {
 656                 int irq = irq_create_mapping(tgi->irq_domain, gpio);
 657                 /* No validity check; all Tegra GPIOs are valid IRQs */
 658 
 659                 bank = &tgi->bank_info[GPIO_BANK(gpio)];
 660 
 661                 irq_set_chip_data(irq, bank);
 662                 irq_set_chip_and_handler(irq, &tgi->ic, handle_simple_irq);
 663         }
 664 
 665         for (i = 0; i < tgi->bank_count; i++) {
 666                 bank = &tgi->bank_info[i];
 667 
 668                 irq_set_chained_handler_and_data(bank->irq,
 669                                                  tegra_gpio_irq_handler, bank);
 670 
 671                 for (j = 0; j < 4; j++) {
 672                         spin_lock_init(&bank->lvl_lock[j]);
 673                         spin_lock_init(&bank->dbc_lock[j]);
 674                 }
 675         }
 676 
 677         tegra_gpio_debuginit(tgi);
 678 
 679         return 0;
 680 }
 681 
 682 static const struct tegra_gpio_soc_config tegra20_gpio_config = {
 683         .bank_stride = 0x80,
 684         .upper_offset = 0x800,
 685 };
 686 
 687 static const struct tegra_gpio_soc_config tegra30_gpio_config = {
 688         .bank_stride = 0x100,
 689         .upper_offset = 0x80,
 690 };
 691 
 692 static const struct tegra_gpio_soc_config tegra210_gpio_config = {
 693         .debounce_supported = true,
 694         .bank_stride = 0x100,
 695         .upper_offset = 0x80,
 696 };
 697 
 698 static const struct of_device_id tegra_gpio_of_match[] = {
 699         { .compatible = "nvidia,tegra210-gpio", .data = &tegra210_gpio_config },
 700         { .compatible = "nvidia,tegra30-gpio", .data = &tegra30_gpio_config },
 701         { .compatible = "nvidia,tegra20-gpio", .data = &tegra20_gpio_config },
 702         { },
 703 };
 704 
 705 static struct platform_driver tegra_gpio_driver = {
 706         .driver         = {
 707                 .name   = "tegra-gpio",
 708                 .pm     = &tegra_gpio_pm_ops,
 709                 .of_match_table = tegra_gpio_of_match,
 710         },
 711         .probe          = tegra_gpio_probe,
 712 };
 713 
 714 static int __init tegra_gpio_init(void)
 715 {
 716         return platform_driver_register(&tegra_gpio_driver);
 717 }
 718 subsys_initcall(tegra_gpio_init);

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