drivers/gpio/gpio-tegra.c

   1 /*
   2  * arch/arm/mach-tegra/gpio.c
   3  *
   4  * Copyright (c) 2010 Google, Inc
   5  *
   6  * Author:
   7  *      Erik Gilling <konkers@google.com>
   8  *
   9  * This software is licensed under the terms of the GNU General Public
  10  * License version 2, as published by the Free Software Foundation, and
  11  * may be copied, distributed, and modified under those terms.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  */
  19
  20 #include <linux/err.h>
  21 #include <linux/init.h>
  22 #include <linux/irq.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/io.h>
  25 #include <linux/gpio.h>
  26 #include <linux/of_device.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/module.h>
  29 #include <linux/irqdomain.h>
  30 #include <linux/irqchip/chained_irq.h>
  31 #include <linux/pinctrl/consumer.h>
  32 #include <linux/pm.h>
  33
  34 #define GPIO_BANK(x)            ((x) >> 5)
  35 #define GPIO_PORT(x)            (((x) >> 3) & 0x3)
  36 #define GPIO_BIT(x)             ((x) & 0x7)
  37
  38 #define GPIO_REG(tgi, x)        (GPIO_BANK(x) * tgi->soc->bank_stride + \
  39                                         GPIO_PORT(x) * 4)
  40
  41 #define GPIO_CNF(t, x)          (GPIO_REG(t, x) + 0x00)
  42 #define GPIO_OE(t, x)           (GPIO_REG(t, x) + 0x10)
  43 #define GPIO_OUT(t, x)          (GPIO_REG(t, x) + 0X20)
  44 #define GPIO_IN(t, x)           (GPIO_REG(t, x) + 0x30)
  45 #define GPIO_INT_STA(t, x)      (GPIO_REG(t, x) + 0x40)
  46 #define GPIO_INT_ENB(t, x)      (GPIO_REG(t, x) + 0x50)
  47 #define GPIO_INT_LVL(t, x)      (GPIO_REG(t, x) + 0x60)
  48 #define GPIO_INT_CLR(t, x)      (GPIO_REG(t, x) + 0x70)
  49 #define GPIO_DBC_CNT(t, x)      (GPIO_REG(t, x) + 0xF0)
  50
  51
  52 #define GPIO_MSK_CNF(t, x)      (GPIO_REG(t, x) + t->soc->upper_offset + 0x00)
  53 #define GPIO_MSK_OE(t, x)       (GPIO_REG(t, x) + t->soc->upper_offset + 0x10)
  54 #define GPIO_MSK_OUT(t, x)      (GPIO_REG(t, x) + t->soc->upper_offset + 0X20)
  55 #define GPIO_MSK_DBC_EN(t, x)   (GPIO_REG(t, x) + t->soc->upper_offset + 0x30)
  56 #define GPIO_MSK_INT_STA(t, x)  (GPIO_REG(t, x) + t->soc->upper_offset + 0x40)
  57 #define GPIO_MSK_INT_ENB(t, x)  (GPIO_REG(t, x) + t->soc->upper_offset + 0x50)
  58 #define GPIO_MSK_INT_LVL(t, x)  (GPIO_REG(t, x) + t->soc->upper_offset + 0x60)
  59
  60 #define GPIO_INT_LVL_MASK               0x010101
  61 #define GPIO_INT_LVL_EDGE_RISING        0x000101
  62 #define GPIO_INT_LVL_EDGE_FALLING       0x000100
  63 #define GPIO_INT_LVL_EDGE_BOTH          0x010100
  64 #define GPIO_INT_LVL_LEVEL_HIGH         0x000001
  65 #define GPIO_INT_LVL_LEVEL_LOW          0x000000
  66
  67 struct tegra_gpio_info;
  68
  69 struct tegra_gpio_bank {
  70         unsigned int bank;
  71         unsigned int irq;
  72         spinlock_t lvl_lock[4];
  73         spinlock_t dbc_lock[4]; /* Lock for updating debounce count register */
  74 #ifdef CONFIG_PM_SLEEP
  75         u32 cnf[4];
  76         u32 out[4];
  77         u32 oe[4];
  78         u32 int_enb[4];
  79         u32 int_lvl[4];
  80         u32 wake_enb[4];
  81         u32 dbc_enb[4];
  82 #endif
  83         u32 dbc_cnt[4];
  84         struct tegra_gpio_info *tgi;
  85 };
  86
  87 struct tegra_gpio_soc_config {
  88         bool debounce_supported;
  89         u32 bank_stride;
  90         u32 upper_offset;
  91 };
  92
  93 struct tegra_gpio_info {
  94         struct device                           *dev;
  95         void __iomem                            *regs;
  96         struct irq_domain                       *irq_domain;
  97         struct tegra_gpio_bank                  *bank_info;
  98         const struct tegra_gpio_soc_config      *soc;
  99         struct gpio_chip                        gc;
 100         struct irq_chip                         ic;
 101         u32                                     bank_count;
 102 };
 103
 104 static inline void tegra_gpio_writel(struct tegra_gpio_info *tgi,
 105                                      u32 val, u32 reg)
 106 {
 107         __raw_writel(val, tgi->regs + reg);
 108 }
 109
 110 static inline u32 tegra_gpio_readl(struct tegra_gpio_info *tgi, u32 reg)
 111 {
 112         return __raw_readl(tgi->regs + reg);
 113 }
 114
 115 static unsigned int tegra_gpio_compose(unsigned int bank, unsigned int port,
 116                                        unsigned int bit)
 117 {
 118         return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7);
 119 }
 120
 121 static void tegra_gpio_mask_write(struct tegra_gpio_info *tgi, u32 reg,
 122                                   unsigned int gpio, u32 value)
 123 {
 124         u32 val;
 125
 126         val = 0x100 << GPIO_BIT(gpio);
 127         if (value)
 128                 val |= 1 << GPIO_BIT(gpio);
 129         tegra_gpio_writel(tgi, val, reg);
 130 }
 131
 132 static void tegra_gpio_enable(struct tegra_gpio_info *tgi, unsigned int gpio)
 133 {
 134         tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 1);
 135 }
 136
 137 static void tegra_gpio_disable(struct tegra_gpio_info *tgi, unsigned int gpio)
 138 {
 139         tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 0);
 140 }
 141
 142 static int tegra_gpio_request(struct gpio_chip *chip, unsigned int offset)
 143 {
 144         return pinctrl_request_gpio(offset);
 145 }
 146
 147 static void tegra_gpio_free(struct gpio_chip *chip, unsigned int offset)
 148 {
 149         struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
 150
 151         pinctrl_free_gpio(offset);
 152         tegra_gpio_disable(tgi, offset);
 153 }
 154
 155 static void tegra_gpio_set(struct gpio_chip *chip, unsigned int offset,
 156                            int value)
 157 {
 158         struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
 159
 160         tegra_gpio_mask_write(tgi, GPIO_MSK_OUT(tgi, offset), offset, value);
 161 }
 162
 163 static int tegra_gpio_get(struct gpio_chip *chip, unsigned int offset)
 164 {
 165         struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
 166         unsigned int bval = BIT(GPIO_BIT(offset));
 167
 168         /* If gpio is in output mode then read from the out value */
 169         if (tegra_gpio_readl(tgi, GPIO_OE(tgi, offset)) & bval)
 170                 return !!(tegra_gpio_readl(tgi, GPIO_OUT(tgi, offset)) & bval);
 171
 172         return !!(tegra_gpio_readl(tgi, GPIO_IN(tgi, offset)) & bval);
 173 }
 174
 175 static int tegra_gpio_direction_input(struct gpio_chip *chip,
 176                                       unsigned int offset)
 177 {
 178         struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
 179
 180         tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 0);
 181         tegra_gpio_enable(tgi, offset);
 182         return 0;
 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
 191         tegra_gpio_set(chip, offset, value);
 192         tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 1);
 193         tegra_gpio_enable(tgi, offset);
 194         return 0;
 195 }
 196
 197 static int tegra_gpio_get_direction(struct gpio_chip *chip,
 198                                     unsigned int offset)
 199 {
 200         struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
 201         u32 pin_mask = BIT(GPIO_BIT(offset));
 202         u32 cnf, oe;
 203
 204         cnf = tegra_gpio_readl(tgi, GPIO_CNF(tgi, offset));
 205         if (!(cnf & pin_mask))
 206                 return -EINVAL;
 207
 208         oe = tegra_gpio_readl(tgi, GPIO_OE(tgi, offset));
 209
 210         return (oe & pin_mask) ? GPIOF_DIR_OUT : GPIOF_DIR_IN;
 211 }
 212
 213 static int tegra_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset,
 214                                    unsigned int debounce)
 215 {
 216         struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
 217         struct tegra_gpio_bank *bank = &tgi->bank_info[GPIO_BANK(offset)];
 218         unsigned int debounce_ms = DIV_ROUND_UP(debounce, 1000);
 219         unsigned long flags;
 220         unsigned int port;
 221
 222         if (!debounce_ms) {
 223                 tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset),
 224                                       offset, 0);
 225                 return 0;
 226         }
 227
 228         debounce_ms = min(debounce_ms, 255U);
 229         port = GPIO_PORT(offset);
 230
 231         /* There is only one debounce count register per port and hence
 232          * set the maximum of current and requested debounce time.
 233          */
 234         spin_lock_irqsave(&bank->dbc_lock[port], flags);
 235         if (bank->dbc_cnt[port] < debounce_ms) {
 236                 tegra_gpio_writel(tgi, debounce_ms, GPIO_DBC_CNT(tgi, offset));
 237                 bank->dbc_cnt[port] = debounce_ms;
 238         }
 239         spin_unlock_irqrestore(&bank->dbc_lock[port], flags);
 240
 241         tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset), offset, 1);
 242
 243         return 0;
 244 }
 245
 246 static int tegra_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
 247                                  unsigned long config)
 248 {
 249         u32 debounce;
 250
 251         if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
 252                 return -ENOTSUPP;
 253
 254         debounce = pinconf_to_config_argument(config);
 255         return tegra_gpio_set_debounce(chip, offset, debounce);
 256 }
 257
 258 static int tegra_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
 259 {
 260         struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
 261
 262         return irq_find_mapping(tgi->irq_domain, offset);
 263 }
 264
 265 static void tegra_gpio_irq_ack(struct irq_data *d)
 266 {
 267         struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
 268         struct tegra_gpio_info *tgi = bank->tgi;
 269         unsigned int gpio = d->hwirq;
 270
 271         tegra_gpio_writel(tgi, 1 << GPIO_BIT(gpio), GPIO_INT_CLR(tgi, gpio));
 272 }
 273
 274 static void tegra_gpio_irq_mask(struct irq_data *d)
 275 {
 276         struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
 277         struct tegra_gpio_info *tgi = bank->tgi;
 278         unsigned int gpio = d->hwirq;
 279
 280         tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 0);
 281 }
 282
 283 static void tegra_gpio_irq_unmask(struct irq_data *d)
 284 {
 285         struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
 286         struct tegra_gpio_info *tgi = bank->tgi;
 287         unsigned int gpio = d->hwirq;
 288
 289         tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 1);
 290 }
 291
 292 static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 293 {
 294         unsigned int gpio = d->hwirq, port = GPIO_PORT(gpio), lvl_type;
 295         struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
 296         struct tegra_gpio_info *tgi = bank->tgi;
 297         unsigned long flags;
 298         u32 val;
 299         int ret;
 300
 301         switch (type & IRQ_TYPE_SENSE_MASK) {
 302         case IRQ_TYPE_EDGE_RISING:
 303                 lvl_type = GPIO_INT_LVL_EDGE_RISING;
 304                 break;
 305
 306         case IRQ_TYPE_EDGE_FALLING:
 307                 lvl_type = GPIO_INT_LVL_EDGE_FALLING;
 308                 break;
 309
 310         case IRQ_TYPE_EDGE_BOTH:
 311                 lvl_type = GPIO_INT_LVL_EDGE_BOTH;
 312                 break;
 313
 314         case IRQ_TYPE_LEVEL_HIGH:
 315                 lvl_type = GPIO_INT_LVL_LEVEL_HIGH;
 316                 break;
 317
 318         case IRQ_TYPE_LEVEL_LOW:
 319                 lvl_type = GPIO_INT_LVL_LEVEL_LOW;
 320                 break;
 321
 322         default:
 323                 return -EINVAL;
 324         }
 325
 326         ret = gpiochip_lock_as_irq(&tgi->gc, gpio);
 327         if (ret) {
 328                 dev_err(tgi->dev,
 329                         "unable to lock Tegra GPIO %u as IRQ\n", gpio);
 330                 return ret;
 331         }
 332
 333         spin_lock_irqsave(&bank->lvl_lock[port], flags);
 334
 335         val = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio));
 336         val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio));
 337         val |= lvl_type << GPIO_BIT(gpio);
 338         tegra_gpio_writel(tgi, val, GPIO_INT_LVL(tgi, gpio));
 339
 340         spin_unlock_irqrestore(&bank->lvl_lock[port], flags);
 341
 342         tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, gpio), gpio, 0);
 343         tegra_gpio_enable(tgi, gpio);
 344
 345         if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
 346                 irq_set_handler_locked(d, handle_level_irq);
 347         else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
 348                 irq_set_handler_locked(d, handle_edge_irq);
 349
 350         return 0;
 351 }
 352
 353 static void tegra_gpio_irq_shutdown(struct irq_data *d)
 354 {
 355         struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
 356         struct tegra_gpio_info *tgi = bank->tgi;
 357         unsigned int gpio = d->hwirq;
 358
 359         gpiochip_unlock_as_irq(&tgi->gc, gpio);
 360 }
 361
 362 static void tegra_gpio_irq_handler(struct irq_desc *desc)
 363 {
 364         unsigned int port, pin, gpio;
 365         bool unmasked = false;
 366         u32 lvl;
 367         unsigned long sta;
 368         struct irq_chip *chip = irq_desc_get_chip(desc);
 369         struct tegra_gpio_bank *bank = irq_desc_get_handler_data(desc);
 370         struct tegra_gpio_info *tgi = bank->tgi;
 371
 372         chained_irq_enter(chip, desc);
 373
 374         for (port = 0; port < 4; port++) {
 375                 gpio = tegra_gpio_compose(bank->bank, port, 0);
 376                 sta = tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)) &
 377                         tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio));
 378                 lvl = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio));
 379
 380                 for_each_set_bit(pin, &sta, 8) {
 381                         tegra_gpio_writel(tgi, 1 << pin,
 382                                           GPIO_INT_CLR(tgi, gpio));
 383
 384                         /* if gpio is edge triggered, clear condition
 385                          * before executing the handler so that we don't
 386                          * miss edges
 387                          */
 388                         if (!unmasked && lvl & (0x100 << pin)) {
 389                                 unmasked = true;
 390                                 chained_irq_exit(chip, desc);
 391                         }
 392
 393                         generic_handle_irq(irq_find_mapping(tgi->irq_domain,
 394                                                             gpio + pin));
 395                 }
 396         }
 397
 398         if (!unmasked)
 399                 chained_irq_exit(chip, desc);
 400
 401 }
 402
 403 #ifdef CONFIG_PM_SLEEP
 404 static int tegra_gpio_resume(struct device *dev)
 405 {
 406         struct platform_device *pdev = to_platform_device(dev);
 407         struct tegra_gpio_info *tgi = platform_get_drvdata(pdev);
 408         unsigned long flags;
 409         unsigned int b, p;
 410
 411         local_irq_save(flags);
 412
 413         for (b = 0; b < tgi->bank_count; b++) {
 414                 struct tegra_gpio_bank *bank = &tgi->bank_info[b];
 415
 416                 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
 417                         unsigned int gpio = (b << 5) | (p << 3);
 418
 419                         tegra_gpio_writel(tgi, bank->cnf[p],
 420                                           GPIO_CNF(tgi, gpio));
 421
 422                         if (tgi->soc->debounce_supported) {
 423                                 tegra_gpio_writel(tgi, bank->dbc_cnt[p],
 424                                                   GPIO_DBC_CNT(tgi, gpio));
 425                                 tegra_gpio_writel(tgi, bank->dbc_enb[p],
 426                                                   GPIO_MSK_DBC_EN(tgi, gpio));
 427                         }
 428
 429                         tegra_gpio_writel(tgi, bank->out[p],
 430                                           GPIO_OUT(tgi, gpio));
 431                         tegra_gpio_writel(tgi, bank->oe[p],
 432                                           GPIO_OE(tgi, gpio));
 433                         tegra_gpio_writel(tgi, bank->int_lvl[p],
 434                                           GPIO_INT_LVL(tgi, gpio));
 435                         tegra_gpio_writel(tgi, bank->int_enb[p],
 436                                           GPIO_INT_ENB(tgi, gpio));
 437                 }
 438         }
 439
 440         local_irq_restore(flags);
 441         return 0;
 442 }
 443
 444 static int tegra_gpio_suspend(struct device *dev)
 445 {
 446         struct platform_device *pdev = to_platform_device(dev);
 447         struct tegra_gpio_info *tgi = platform_get_drvdata(pdev);
 448         unsigned long flags;
 449         unsigned int b, p;
 450
 451         local_irq_save(flags);
 452         for (b = 0; b < tgi->bank_count; b++) {
 453                 struct tegra_gpio_bank *bank = &tgi->bank_info[b];
 454
 455                 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
 456                         unsigned int gpio = (b << 5) | (p << 3);
 457
 458                         bank->cnf[p] = tegra_gpio_readl(tgi,
 459                                                         GPIO_CNF(tgi, gpio));
 460                         bank->out[p] = tegra_gpio_readl(tgi,
 461                                                         GPIO_OUT(tgi, gpio));
 462                         bank->oe[p] = tegra_gpio_readl(tgi,
 463                                                        GPIO_OE(tgi, gpio));
 464                         if (tgi->soc->debounce_supported) {
 465                                 bank->dbc_enb[p] = tegra_gpio_readl(tgi,
 466                                                 GPIO_MSK_DBC_EN(tgi, gpio));
 467                                 bank->dbc_enb[p] = (bank->dbc_enb[p] << 8) |
 468                                                         bank->dbc_enb[p];
 469                         }
 470
 471                         bank->int_enb[p] = tegra_gpio_readl(tgi,
 472                                                 GPIO_INT_ENB(tgi, gpio));
 473                         bank->int_lvl[p] = tegra_gpio_readl(tgi,
 474                                                 GPIO_INT_LVL(tgi, gpio));
 475
 476                         /* Enable gpio irq for wake up source */
 477                         tegra_gpio_writel(tgi, bank->wake_enb[p],
 478                                           GPIO_INT_ENB(tgi, gpio));
 479                 }
 480         }
 481         local_irq_restore(flags);
 482         return 0;
 483 }
 484
 485 static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable)
 486 {
 487         struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
 488         unsigned int gpio = d->hwirq;
 489         u32 port, bit, mask;
 490
 491         port = GPIO_PORT(gpio);
 492         bit = GPIO_BIT(gpio);
 493         mask = BIT(bit);
 494
 495         if (enable)
 496                 bank->wake_enb[port] |= mask;
 497         else
 498                 bank->wake_enb[port] &= ~mask;
 499
 500         return irq_set_irq_wake(bank->irq, enable);
 501 }
 502 #endif
 503
 504 #ifdef  CONFIG_DEBUG_FS
 505
 506 #include <linux/debugfs.h>
 507 #include <linux/seq_file.h>
 508
 509 static int dbg_gpio_show(struct seq_file *s, void *unused)
 510 {
 511         struct tegra_gpio_info *tgi = s->private;
 512         unsigned int i, j;
 513
 514         for (i = 0; i < tgi->bank_count; i++) {
 515                 for (j = 0; j < 4; j++) {
 516                         unsigned int gpio = tegra_gpio_compose(i, j, 0);
 517
 518                         seq_printf(s,
 519                                 "%u:%u %02x %02x %02x %02x %02x %02x %06x\n",
 520                                 i, j,
 521                                 tegra_gpio_readl(tgi, GPIO_CNF(tgi, gpio)),
 522                                 tegra_gpio_readl(tgi, GPIO_OE(tgi, gpio)),
 523                                 tegra_gpio_readl(tgi, GPIO_OUT(tgi, gpio)),
 524                                 tegra_gpio_readl(tgi, GPIO_IN(tgi, gpio)),
 525                                 tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)),
 526                                 tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio)),
 527                                 tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio)));
 528                 }
 529         }
 530         return 0;
 531 }
 532
 533 static int dbg_gpio_open(struct inode *inode, struct file *file)
 534 {
 535         return single_open(file, dbg_gpio_show, inode->i_private);
 536 }
 537
 538 static const struct file_operations debug_fops = {
 539         .open           = dbg_gpio_open,
 540         .read           = seq_read,
 541         .llseek         = seq_lseek,
 542         .release        = single_release,
 543 };
 544
 545 static void tegra_gpio_debuginit(struct tegra_gpio_info *tgi)
 546 {
 547         (void) debugfs_create_file("tegra_gpio", 0444,
 548                                         NULL, tgi, &debug_fops);
 549 }
 550
 551 #else
 552
 553 static inline void tegra_gpio_debuginit(struct tegra_gpio_info *tgi)
 554 {
 555 }
 556
 557 #endif
 558
 559 static const struct dev_pm_ops tegra_gpio_pm_ops = {
 560         SET_SYSTEM_SLEEP_PM_OPS(tegra_gpio_suspend, tegra_gpio_resume)
 561 };
 562
 563 /*
 564  * This lock class tells lockdep that GPIO irqs are in a different category
 565  * than their parents, so it won't report false recursion.
 566  */
 567 static struct lock_class_key gpio_lock_class;
 568
 569 static int tegra_gpio_probe(struct platform_device *pdev)
 570 {
 571         struct tegra_gpio_info *tgi;
 572         struct resource *res;
 573         struct tegra_gpio_bank *bank;
 574         unsigned int gpio, i, j;
 575         int ret;
 576
 577         tgi = devm_kzalloc(&pdev->dev, sizeof(*tgi), GFP_KERNEL);
 578         if (!tgi)
 579                 return -ENODEV;
 580
 581         tgi->soc = of_device_get_match_data(&pdev->dev);
 582         tgi->dev = &pdev->dev;
 583
 584         ret = platform_irq_count(pdev);
 585         if (ret < 0)
 586                 return ret;
 587
 588         tgi->bank_count = ret;
 589
 590         if (!tgi->bank_count) {
 591                 dev_err(&pdev->dev, "Missing IRQ resource\n");
 592                 return -ENODEV;
 593         }
 594
 595         tgi->gc.label                   = "tegra-gpio";
 596         tgi->gc.request                 = tegra_gpio_request;
 597         tgi->gc.free                    = tegra_gpio_free;
 598         tgi->gc.direction_input         = tegra_gpio_direction_input;
 599         tgi->gc.get                     = tegra_gpio_get;
 600         tgi->gc.direction_output        = tegra_gpio_direction_output;
 601         tgi->gc.set                     = tegra_gpio_set;
 602         tgi->gc.get_direction           = tegra_gpio_get_direction;
 603         tgi->gc.to_irq                  = tegra_gpio_to_irq;
 604         tgi->gc.base                    = 0;
 605         tgi->gc.ngpio                   = tgi->bank_count * 32;
 606         tgi->gc.parent                  = &pdev->dev;
 607         tgi->gc.of_node                 = pdev->dev.of_node;
 608
 609         tgi->ic.name                    = "GPIO";
 610         tgi->ic.irq_ack                 = tegra_gpio_irq_ack;
 611         tgi->ic.irq_mask                = tegra_gpio_irq_mask;
 612         tgi->ic.irq_unmask              = tegra_gpio_irq_unmask;
 613         tgi->ic.irq_set_type            = tegra_gpio_irq_set_type;
 614         tgi->ic.irq_shutdown            = tegra_gpio_irq_shutdown;
 615 #ifdef CONFIG_PM_SLEEP
 616         tgi->ic.irq_set_wake            = tegra_gpio_irq_set_wake;
 617 #endif
 618
 619         platform_set_drvdata(pdev, tgi);
 620
 621         if (tgi->soc->debounce_supported)
 622                 tgi->gc.set_config = tegra_gpio_set_config;
 623
 624         tgi->bank_info = devm_kcalloc(&pdev->dev, tgi->bank_count,
 625                                       sizeof(*tgi->bank_info), GFP_KERNEL);
 626         if (!tgi->bank_info)
 627                 return -ENOMEM;
 628
 629         tgi->irq_domain = irq_domain_add_linear(pdev->dev.of_node,
 630                                                 tgi->gc.ngpio,
 631                                                 &irq_domain_simple_ops, NULL);
 632         if (!tgi->irq_domain)
 633                 return -ENODEV;
 634
 635         for (i = 0; i < tgi->bank_count; i++) {
 636                 ret = platform_get_irq(pdev, i);
 637                 if (ret < 0) {
 638                         dev_err(&pdev->dev, "Missing IRQ resource: %d\n", ret);
 639                         return ret;
 640                 }
 641
 642                 bank = &tgi->bank_info[i];
 643                 bank->bank = i;
 644                 bank->irq = ret;
 645                 bank->tgi = tgi;
 646         }
 647
 648         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 649         tgi->regs = devm_ioremap_resource(&pdev->dev, res);
 650         if (IS_ERR(tgi->regs))
 651                 return PTR_ERR(tgi->regs);
 652
 653         for (i = 0; i < tgi->bank_count; i++) {
 654                 for (j = 0; j < 4; j++) {
 655                         int gpio = tegra_gpio_compose(i, j, 0);
 656
 657                         tegra_gpio_writel(tgi, 0x00, GPIO_INT_ENB(tgi, gpio));
 658                 }
 659         }
 660
 661         ret = devm_gpiochip_add_data(&pdev->dev, &tgi->gc, tgi);
 662         if (ret < 0) {
 663                 irq_domain_remove(tgi->irq_domain);
 664                 return ret;
 665         }
 666
 667         for (gpio = 0; gpio < tgi->gc.ngpio; gpio++) {
 668                 int irq = irq_create_mapping(tgi->irq_domain, gpio);
 669                 /* No validity check; all Tegra GPIOs are valid IRQs */
 670
 671                 bank = &tgi->bank_info[GPIO_BANK(gpio)];
 672
 673                 irq_set_lockdep_class(irq, &gpio_lock_class);
 674                 irq_set_chip_data(irq, bank);
 675                 irq_set_chip_and_handler(irq, &tgi->ic, handle_simple_irq);
 676         }
 677
 678         for (i = 0; i < tgi->bank_count; i++) {
 679                 bank = &tgi->bank_info[i];
 680
 681                 irq_set_chained_handler_and_data(bank->irq,
 682                                                  tegra_gpio_irq_handler, bank);
 683
 684                 for (j = 0; j < 4; j++) {
 685                         spin_lock_init(&bank->lvl_lock[j]);
 686                         spin_lock_init(&bank->dbc_lock[j]);
 687                 }
 688         }
 689
 690         tegra_gpio_debuginit(tgi);
 691
 692         return 0;
 693 }
 694
 695 static const struct tegra_gpio_soc_config tegra20_gpio_config = {
 696         .bank_stride = 0x80,
 697         .upper_offset = 0x800,
 698 };
 699
 700 static const struct tegra_gpio_soc_config tegra30_gpio_config = {
 701         .bank_stride = 0x100,
 702         .upper_offset = 0x80,
 703 };
 704
 705 static const struct tegra_gpio_soc_config tegra210_gpio_config = {
 706         .debounce_supported = true,
 707         .bank_stride = 0x100,
 708         .upper_offset = 0x80,
 709 };
 710
 711 static const struct of_device_id tegra_gpio_of_match[] = {
 712         { .compatible = "nvidia,tegra210-gpio", .data = &tegra210_gpio_config },
 713         { .compatible = "nvidia,tegra30-gpio", .data = &tegra30_gpio_config },
 714         { .compatible = "nvidia,tegra20-gpio", .data = &tegra20_gpio_config },
 715         { },
 716 };
 717
 718 static struct platform_driver tegra_gpio_driver = {
 719         .driver         = {
 720                 .name   = "tegra-gpio",
 721                 .pm     = &tegra_gpio_pm_ops,
 722                 .of_match_table = tegra_gpio_of_match,
 723         },
 724         .probe          = tegra_gpio_probe,
 725 };
 726
 727 static int __init tegra_gpio_init(void)
 728 {
 729         return platform_driver_register(&tegra_gpio_driver);
 730 }
 731 subsys_initcall(tegra_gpio_init);