drivers/pinctrl/pinctrl-amd.c

   1 /*
   2  * GPIO driver for AMD
   3  *
   4  * Copyright (c) 2014,2015 AMD Corporation.
   5  * Authors: Ken Xue <Ken.Xue@amd.com>
   6  *      Wu, Jeff <Jeff.Wu@amd.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms and conditions of the GNU General Public License,
  10  * version 2, as published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/bug.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/compiler.h>
  19 #include <linux/types.h>
  20 #include <linux/errno.h>
  21 #include <linux/log2.h>
  22 #include <linux/io.h>
  23 #include <linux/gpio.h>
  24 #include <linux/slab.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/mutex.h>
  27 #include <linux/acpi.h>
  28 #include <linux/seq_file.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/list.h>
  31 #include <linux/bitops.h>
  32 #include <linux/pinctrl/pinconf.h>
  33 #include <linux/pinctrl/pinconf-generic.h>
  34
  35 #include "pinctrl-utils.h"
  36 #include "pinctrl-amd.h"
  37
  38 static int amd_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
  39 {
  40         unsigned long flags;
  41         u32 pin_reg;
  42         struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
  43
  44         spin_lock_irqsave(&gpio_dev->lock, flags);
  45         pin_reg = readl(gpio_dev->base + offset * 4);
  46         pin_reg &= ~BIT(OUTPUT_ENABLE_OFF);
  47         writel(pin_reg, gpio_dev->base + offset * 4);
  48         spin_unlock_irqrestore(&gpio_dev->lock, flags);
  49
  50         return 0;
  51 }
  52
  53 static int amd_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
  54                 int value)
  55 {
  56         u32 pin_reg;
  57         unsigned long flags;
  58         struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
  59
  60         spin_lock_irqsave(&gpio_dev->lock, flags);
  61         pin_reg = readl(gpio_dev->base + offset * 4);
  62         pin_reg |= BIT(OUTPUT_ENABLE_OFF);
  63         if (value)
  64                 pin_reg |= BIT(OUTPUT_VALUE_OFF);
  65         else
  66                 pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
  67         writel(pin_reg, gpio_dev->base + offset * 4);
  68         spin_unlock_irqrestore(&gpio_dev->lock, flags);
  69
  70         return 0;
  71 }
  72
  73 static int amd_gpio_get_value(struct gpio_chip *gc, unsigned offset)
  74 {
  75         u32 pin_reg;
  76         unsigned long flags;
  77         struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
  78
  79         spin_lock_irqsave(&gpio_dev->lock, flags);
  80         pin_reg = readl(gpio_dev->base + offset * 4);
  81         spin_unlock_irqrestore(&gpio_dev->lock, flags);
  82
  83         return !!(pin_reg & BIT(PIN_STS_OFF));
  84 }
  85
  86 static void amd_gpio_set_value(struct gpio_chip *gc, unsigned offset, int value)
  87 {
  88         u32 pin_reg;
  89         unsigned long flags;
  90         struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
  91
  92         spin_lock_irqsave(&gpio_dev->lock, flags);
  93         pin_reg = readl(gpio_dev->base + offset * 4);
  94         if (value)
  95                 pin_reg |= BIT(OUTPUT_VALUE_OFF);
  96         else
  97                 pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
  98         writel(pin_reg, gpio_dev->base + offset * 4);
  99         spin_unlock_irqrestore(&gpio_dev->lock, flags);
 100 }
 101
 102 static int amd_gpio_set_debounce(struct gpio_chip *gc, unsigned offset,
 103                 unsigned debounce)
 104 {
 105         u32 time;
 106         u32 pin_reg;
 107         int ret = 0;
 108         unsigned long flags;
 109         struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
 110
 111         spin_lock_irqsave(&gpio_dev->lock, flags);
 112         pin_reg = readl(gpio_dev->base + offset * 4);
 113
 114         if (debounce) {
 115                 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
 116                 pin_reg &= ~DB_TMR_OUT_MASK;
 117                 /*
 118                 Debounce        Debounce        Timer   Max
 119                 TmrLarge        TmrOutUnit      Unit    Debounce
 120                                                         Time
 121                 0       0       61 usec (2 RtcClk)      976 usec
 122                 0       1       244 usec (8 RtcClk)     3.9 msec
 123                 1       0       15.6 msec (512 RtcClk)  250 msec
 124                 1       1       62.5 msec (2048 RtcClk) 1 sec
 125                 */
 126
 127                 if (debounce < 61) {
 128                         pin_reg |= 1;
 129                         pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
 130                         pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
 131                 } else if (debounce < 976) {
 132                         time = debounce / 61;
 133                         pin_reg |= time & DB_TMR_OUT_MASK;
 134                         pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
 135                         pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
 136                 } else if (debounce < 3900) {
 137                         time = debounce / 244;
 138                         pin_reg |= time & DB_TMR_OUT_MASK;
 139                         pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
 140                         pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
 141                 } else if (debounce < 250000) {
 142                         time = debounce / 15600;
 143                         pin_reg |= time & DB_TMR_OUT_MASK;
 144                         pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
 145                         pin_reg |= BIT(DB_TMR_LARGE_OFF);
 146                 } else if (debounce < 1000000) {
 147                         time = debounce / 62500;
 148                         pin_reg |= time & DB_TMR_OUT_MASK;
 149                         pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
 150                         pin_reg |= BIT(DB_TMR_LARGE_OFF);
 151                 } else {
 152                         pin_reg &= ~DB_CNTRl_MASK;
 153                         ret = -EINVAL;
 154                 }
 155         } else {
 156                 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
 157                 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
 158                 pin_reg &= ~DB_TMR_OUT_MASK;
 159                 pin_reg &= ~DB_CNTRl_MASK;
 160         }
 161         writel(pin_reg, gpio_dev->base + offset * 4);
 162         spin_unlock_irqrestore(&gpio_dev->lock, flags);
 163
 164         return ret;
 165 }
 166
 167 #ifdef CONFIG_DEBUG_FS
 168 static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc)
 169 {
 170         u32 pin_reg;
 171         unsigned long flags;
 172         unsigned int bank, i, pin_num;
 173         struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
 174
 175         char *level_trig;
 176         char *active_level;
 177         char *interrupt_enable;
 178         char *interrupt_mask;
 179         char *wake_cntrl0;
 180         char *wake_cntrl1;
 181         char *wake_cntrl2;
 182         char *pin_sts;
 183         char *pull_up_sel;
 184         char *pull_up_enable;
 185         char *pull_down_enable;
 186         char *output_value;
 187         char *output_enable;
 188
 189         for (bank = 0; bank < AMD_GPIO_TOTAL_BANKS; bank++) {
 190                 seq_printf(s, "GPIO bank%d\t", bank);
 191
 192                 switch (bank) {
 193                 case 0:
 194                         i = 0;
 195                         pin_num = AMD_GPIO_PINS_BANK0;
 196                         break;
 197                 case 1:
 198                         i = 64;
 199                         pin_num = AMD_GPIO_PINS_BANK1 + i;
 200                         break;
 201                 case 2:
 202                         i = 128;
 203                         pin_num = AMD_GPIO_PINS_BANK2 + i;
 204                         break;
 205                 }
 206
 207                 for (; i < pin_num; i++) {
 208                         seq_printf(s, "pin%d\t", i);
 209                         spin_lock_irqsave(&gpio_dev->lock, flags);
 210                         pin_reg = readl(gpio_dev->base + i * 4);
 211                         spin_unlock_irqrestore(&gpio_dev->lock, flags);
 212
 213                         if (pin_reg & BIT(INTERRUPT_ENABLE_OFF)) {
 214                                 interrupt_enable = "interrupt is enabled|";
 215
 216                                 if (!(pin_reg & BIT(ACTIVE_LEVEL_OFF))
 217                                 && !(pin_reg & BIT(ACTIVE_LEVEL_OFF+1)))
 218                                         active_level = "Active low|";
 219                                 else if (pin_reg & BIT(ACTIVE_LEVEL_OFF)
 220                                 && !(pin_reg & BIT(ACTIVE_LEVEL_OFF+1)))
 221                                         active_level = "Active high|";
 222                                 else if (!(pin_reg & BIT(ACTIVE_LEVEL_OFF))
 223                                         && pin_reg & BIT(ACTIVE_LEVEL_OFF+1))
 224                                         active_level = "Active on both|";
 225                                 else
 226                                         active_level = "Unknow Active level|";
 227
 228                                 if (pin_reg & BIT(LEVEL_TRIG_OFF))
 229                                         level_trig = "Level trigger|";
 230                                 else
 231                                         level_trig = "Edge trigger|";
 232
 233                         } else {
 234                                 interrupt_enable =
 235                                         "interrupt is disabled|";
 236                                 active_level = " ";
 237                                 level_trig = " ";
 238                         }
 239
 240                         if (pin_reg & BIT(INTERRUPT_MASK_OFF))
 241                                 interrupt_mask =
 242                                         "interrupt is unmasked|";
 243                         else
 244                                 interrupt_mask =
 245                                         "interrupt is masked|";
 246
 247                         if (pin_reg & BIT(WAKE_CNTRL_OFF))
 248                                 wake_cntrl0 = "enable wakeup in S0i3 state|";
 249                         else
 250                                 wake_cntrl0 = "disable wakeup in S0i3 state|";
 251
 252                         if (pin_reg & BIT(WAKE_CNTRL_OFF))
 253                                 wake_cntrl1 = "enable wakeup in S3 state|";
 254                         else
 255                                 wake_cntrl1 = "disable wakeup in S3 state|";
 256
 257                         if (pin_reg & BIT(WAKE_CNTRL_OFF))
 258                                 wake_cntrl2 = "enable wakeup in S4/S5 state|";
 259                         else
 260                                 wake_cntrl2 = "disable wakeup in S4/S5 state|";
 261
 262                         if (pin_reg & BIT(PULL_UP_ENABLE_OFF)) {
 263                                 pull_up_enable = "pull-up is enabled|";
 264                                 if (pin_reg & BIT(PULL_UP_SEL_OFF))
 265                                         pull_up_sel = "8k pull-up|";
 266                                 else
 267                                         pull_up_sel = "4k pull-up|";
 268                         } else {
 269                                 pull_up_enable = "pull-up is disabled|";
 270                                 pull_up_sel = " ";
 271                         }
 272
 273                         if (pin_reg & BIT(PULL_DOWN_ENABLE_OFF))
 274                                 pull_down_enable = "pull-down is enabled|";
 275                         else
 276                                 pull_down_enable = "Pull-down is disabled|";
 277
 278                         if (pin_reg & BIT(OUTPUT_ENABLE_OFF)) {
 279                                 pin_sts = " ";
 280                                 output_enable = "output is enabled|";
 281                                 if (pin_reg & BIT(OUTPUT_VALUE_OFF))
 282                                         output_value = "output is high|";
 283                                 else
 284                                         output_value = "output is low|";
 285                         } else {
 286                                 output_enable = "output is disabled|";
 287                                 output_value = " ";
 288
 289                                 if (pin_reg & BIT(PIN_STS_OFF))
 290                                         pin_sts = "input is high|";
 291                                 else
 292                                         pin_sts = "input is low|";
 293                         }
 294
 295                         seq_printf(s, "%s %s %s %s %s %s\n"
 296                                 " %s %s %s %s %s %s %s 0x%x\n",
 297                                 level_trig, active_level, interrupt_enable,
 298                                 interrupt_mask, wake_cntrl0, wake_cntrl1,
 299                                 wake_cntrl2, pin_sts, pull_up_sel,
 300                                 pull_up_enable, pull_down_enable,
 301                                 output_value, output_enable, pin_reg);
 302                 }
 303         }
 304 }
 305 #else
 306 #define amd_gpio_dbg_show NULL
 307 #endif
 308
 309 static void amd_gpio_irq_enable(struct irq_data *d)
 310 {
 311         u32 pin_reg;
 312         unsigned long flags;
 313         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 314         struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
 315
 316         spin_lock_irqsave(&gpio_dev->lock, flags);
 317         pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
 318         pin_reg |= BIT(INTERRUPT_ENABLE_OFF);
 319         pin_reg |= BIT(INTERRUPT_MASK_OFF);
 320         writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
 321         spin_unlock_irqrestore(&gpio_dev->lock, flags);
 322 }
 323
 324 static void amd_gpio_irq_disable(struct irq_data *d)
 325 {
 326         u32 pin_reg;
 327         unsigned long flags;
 328         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 329         struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
 330
 331         spin_lock_irqsave(&gpio_dev->lock, flags);
 332         pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
 333         pin_reg &= ~BIT(INTERRUPT_ENABLE_OFF);
 334         pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
 335         writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
 336         spin_unlock_irqrestore(&gpio_dev->lock, flags);
 337 }
 338
 339 static void amd_gpio_irq_mask(struct irq_data *d)
 340 {
 341         u32 pin_reg;
 342         unsigned long flags;
 343         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 344         struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
 345
 346         spin_lock_irqsave(&gpio_dev->lock, flags);
 347         pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
 348         pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
 349         writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
 350         spin_unlock_irqrestore(&gpio_dev->lock, flags);
 351 }
 352
 353 static void amd_gpio_irq_unmask(struct irq_data *d)
 354 {
 355         u32 pin_reg;
 356         unsigned long flags;
 357         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 358         struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
 359
 360         spin_lock_irqsave(&gpio_dev->lock, flags);
 361         pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
 362         pin_reg |= BIT(INTERRUPT_MASK_OFF);
 363         writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
 364         spin_unlock_irqrestore(&gpio_dev->lock, flags);
 365 }
 366
 367 static void amd_gpio_irq_eoi(struct irq_data *d)
 368 {
 369         u32 reg;
 370         unsigned long flags;
 371         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 372         struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
 373
 374         spin_lock_irqsave(&gpio_dev->lock, flags);
 375         reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
 376         reg |= EOI_MASK;
 377         writel(reg, gpio_dev->base + WAKE_INT_MASTER_REG);
 378         spin_unlock_irqrestore(&gpio_dev->lock, flags);
 379 }
 380
 381 static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 382 {
 383         int ret = 0;
 384         u32 pin_reg;
 385         unsigned long flags, irq_flags;
 386         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 387         struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
 388
 389         spin_lock_irqsave(&gpio_dev->lock, flags);
 390         pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
 391
 392         /* Ignore the settings coming from the client and
 393          * read the values from the ACPI tables
 394          * while setting the trigger type
 395          */
 396
 397         irq_flags = irq_get_trigger_type(d->irq);
 398         if (irq_flags != IRQ_TYPE_NONE)
 399                 type = irq_flags;
 400
 401         switch (type & IRQ_TYPE_SENSE_MASK) {
 402         case IRQ_TYPE_EDGE_RISING:
 403                 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
 404                 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
 405                 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
 406                 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
 407                 irq_set_handler_locked(d, handle_edge_irq);
 408                 break;
 409
 410         case IRQ_TYPE_EDGE_FALLING:
 411                 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
 412                 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
 413                 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
 414                 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
 415                 irq_set_handler_locked(d, handle_edge_irq);
 416                 break;
 417
 418         case IRQ_TYPE_EDGE_BOTH:
 419                 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
 420                 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
 421                 pin_reg |= BOTH_EADGE << ACTIVE_LEVEL_OFF;
 422                 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
 423                 irq_set_handler_locked(d, handle_edge_irq);
 424                 break;
 425
 426         case IRQ_TYPE_LEVEL_HIGH:
 427                 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
 428                 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
 429                 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
 430                 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
 431                 pin_reg |= DB_TYPE_PRESERVE_LOW_GLITCH << DB_CNTRL_OFF;
 432                 irq_set_handler_locked(d, handle_level_irq);
 433                 break;
 434
 435         case IRQ_TYPE_LEVEL_LOW:
 436                 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
 437                 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
 438                 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
 439                 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
 440                 pin_reg |= DB_TYPE_PRESERVE_HIGH_GLITCH << DB_CNTRL_OFF;
 441                 irq_set_handler_locked(d, handle_level_irq);
 442                 break;
 443
 444         case IRQ_TYPE_NONE:
 445                 break;
 446
 447         default:
 448                 dev_err(&gpio_dev->pdev->dev, "Invalid type value\n");
 449                 ret = -EINVAL;
 450         }
 451
 452         pin_reg |= CLR_INTR_STAT << INTERRUPT_STS_OFF;
 453         writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
 454         spin_unlock_irqrestore(&gpio_dev->lock, flags);
 455
 456         return ret;
 457 }
 458
 459 static void amd_irq_ack(struct irq_data *d)
 460 {
 461         /*
 462          * based on HW design,there is no need to ack HW
 463          * before handle current irq. But this routine is
 464          * necessary for handle_edge_irq
 465         */
 466 }
 467
 468 static struct irq_chip amd_gpio_irqchip = {
 469         .name         = "amd_gpio",
 470         .irq_ack      = amd_irq_ack,
 471         .irq_enable   = amd_gpio_irq_enable,
 472         .irq_disable  = amd_gpio_irq_disable,
 473         .irq_mask     = amd_gpio_irq_mask,
 474         .irq_unmask   = amd_gpio_irq_unmask,
 475         .irq_eoi      = amd_gpio_irq_eoi,
 476         .irq_set_type = amd_gpio_irq_set_type,
 477 };
 478
 479 static void amd_gpio_irq_handler(struct irq_desc *desc)
 480 {
 481         u32 i;
 482         u32 off;
 483         u32 reg;
 484         u32 pin_reg;
 485         u64 reg64;
 486         int handled = 0;
 487         unsigned int irq;
 488         unsigned long flags;
 489         struct irq_chip *chip = irq_desc_get_chip(desc);
 490         struct gpio_chip *gc = irq_desc_get_handler_data(desc);
 491         struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
 492
 493         chained_irq_enter(chip, desc);
 494         /*enable GPIO interrupt again*/
 495         spin_lock_irqsave(&gpio_dev->lock, flags);
 496         reg = readl(gpio_dev->base + WAKE_INT_STATUS_REG1);
 497         reg64 = reg;
 498         reg64 = reg64 << 32;
 499
 500         reg = readl(gpio_dev->base + WAKE_INT_STATUS_REG0);
 501         reg64 |= reg;
 502         spin_unlock_irqrestore(&gpio_dev->lock, flags);
 503
 504         /*
 505          * first 46 bits indicates interrupt status.
 506          * one bit represents four interrupt sources.
 507         */
 508         for (off = 0; off < 46 ; off++) {
 509                 if (reg64 & BIT(off)) {
 510                         for (i = 0; i < 4; i++) {
 511                                 pin_reg = readl(gpio_dev->base +
 512                                                 (off * 4 + i) * 4);
 513                                 if ((pin_reg & BIT(INTERRUPT_STS_OFF)) ||
 514                                         (pin_reg & BIT(WAKE_STS_OFF))) {
 515                                         irq = irq_find_mapping(gc->irqdomain,
 516                                                                 off * 4 + i);
 517                                         generic_handle_irq(irq);
 518                                         writel(pin_reg,
 519                                                 gpio_dev->base
 520                                                 + (off * 4 + i) * 4);
 521                                         handled++;
 522                                 }
 523                         }
 524                 }
 525         }
 526
 527         if (handled == 0)
 528                 handle_bad_irq(desc);
 529
 530         spin_lock_irqsave(&gpio_dev->lock, flags);
 531         reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
 532         reg |= EOI_MASK;
 533         writel(reg, gpio_dev->base + WAKE_INT_MASTER_REG);
 534         spin_unlock_irqrestore(&gpio_dev->lock, flags);
 535
 536         chained_irq_exit(chip, desc);
 537 }
 538
 539 static int amd_get_groups_count(struct pinctrl_dev *pctldev)
 540 {
 541         struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
 542
 543         return gpio_dev->ngroups;
 544 }
 545
 546 static const char *amd_get_group_name(struct pinctrl_dev *pctldev,
 547                                       unsigned group)
 548 {
 549         struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
 550
 551         return gpio_dev->groups[group].name;
 552 }
 553
 554 static int amd_get_group_pins(struct pinctrl_dev *pctldev,
 555                               unsigned group,
 556                               const unsigned **pins,
 557                               unsigned *num_pins)
 558 {
 559         struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
 560
 561         *pins = gpio_dev->groups[group].pins;
 562         *num_pins = gpio_dev->groups[group].npins;
 563         return 0;
 564 }
 565
 566 static const struct pinctrl_ops amd_pinctrl_ops = {
 567         .get_groups_count       = amd_get_groups_count,
 568         .get_group_name         = amd_get_group_name,
 569         .get_group_pins         = amd_get_group_pins,
 570 #ifdef CONFIG_OF
 571         .dt_node_to_map         = pinconf_generic_dt_node_to_map_group,
 572         .dt_free_map            = pinctrl_utils_free_map,
 573 #endif
 574 };
 575
 576 static int amd_pinconf_get(struct pinctrl_dev *pctldev,
 577                           unsigned int pin,
 578                           unsigned long *config)
 579 {
 580         u32 pin_reg;
 581         unsigned arg;
 582         unsigned long flags;
 583         struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
 584         enum pin_config_param param = pinconf_to_config_param(*config);
 585
 586         spin_lock_irqsave(&gpio_dev->lock, flags);
 587         pin_reg = readl(gpio_dev->base + pin*4);
 588         spin_unlock_irqrestore(&gpio_dev->lock, flags);
 589         switch (param) {
 590         case PIN_CONFIG_INPUT_DEBOUNCE:
 591                 arg = pin_reg & DB_TMR_OUT_MASK;
 592                 break;
 593
 594         case PIN_CONFIG_BIAS_PULL_DOWN:
 595                 arg = (pin_reg >> PULL_DOWN_ENABLE_OFF) & BIT(0);
 596                 break;
 597
 598         case PIN_CONFIG_BIAS_PULL_UP:
 599                 arg = (pin_reg >> PULL_UP_SEL_OFF) & (BIT(0) | BIT(1));
 600                 break;
 601
 602         case PIN_CONFIG_DRIVE_STRENGTH:
 603                 arg = (pin_reg >> DRV_STRENGTH_SEL_OFF) & DRV_STRENGTH_SEL_MASK;
 604                 break;
 605
 606         default:
 607                 dev_err(&gpio_dev->pdev->dev, "Invalid config param %04x\n",
 608                         param);
 609                 return -ENOTSUPP;
 610         }
 611
 612         *config = pinconf_to_config_packed(param, arg);
 613
 614         return 0;
 615 }
 616
 617 static int amd_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
 618                                 unsigned long *configs, unsigned num_configs)
 619 {
 620         int i;
 621         u32 arg;
 622         int ret = 0;
 623         u32 pin_reg;
 624         unsigned long flags;
 625         enum pin_config_param param;
 626         struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
 627
 628         spin_lock_irqsave(&gpio_dev->lock, flags);
 629         for (i = 0; i < num_configs; i++) {
 630                 param = pinconf_to_config_param(configs[i]);
 631                 arg = pinconf_to_config_argument(configs[i]);
 632                 pin_reg = readl(gpio_dev->base + pin*4);
 633
 634                 switch (param) {
 635                 case PIN_CONFIG_INPUT_DEBOUNCE:
 636                         pin_reg &= ~DB_TMR_OUT_MASK;
 637                         pin_reg |= arg & DB_TMR_OUT_MASK;
 638                         break;
 639
 640                 case PIN_CONFIG_BIAS_PULL_DOWN:
 641                         pin_reg &= ~BIT(PULL_DOWN_ENABLE_OFF);
 642                         pin_reg |= (arg & BIT(0)) << PULL_DOWN_ENABLE_OFF;
 643                         break;
 644
 645                 case PIN_CONFIG_BIAS_PULL_UP:
 646                         pin_reg &= ~BIT(PULL_UP_SEL_OFF);
 647                         pin_reg |= (arg & BIT(0)) << PULL_UP_SEL_OFF;
 648                         pin_reg &= ~BIT(PULL_UP_ENABLE_OFF);
 649                         pin_reg |= ((arg>>1) & BIT(0)) << PULL_UP_ENABLE_OFF;
 650                         break;
 651
 652                 case PIN_CONFIG_DRIVE_STRENGTH:
 653                         pin_reg &= ~(DRV_STRENGTH_SEL_MASK
 654                                         << DRV_STRENGTH_SEL_OFF);
 655                         pin_reg |= (arg & DRV_STRENGTH_SEL_MASK)
 656                                         << DRV_STRENGTH_SEL_OFF;
 657                         break;
 658
 659                 default:
 660                         dev_err(&gpio_dev->pdev->dev,
 661                                 "Invalid config param %04x\n", param);
 662                         ret = -ENOTSUPP;
 663                 }
 664
 665                 writel(pin_reg, gpio_dev->base + pin*4);
 666         }
 667         spin_unlock_irqrestore(&gpio_dev->lock, flags);
 668
 669         return ret;
 670 }
 671
 672 static int amd_pinconf_group_get(struct pinctrl_dev *pctldev,
 673                                 unsigned int group,
 674                                 unsigned long *config)
 675 {
 676         const unsigned *pins;
 677         unsigned npins;
 678         int ret;
 679
 680         ret = amd_get_group_pins(pctldev, group, &pins, &npins);
 681         if (ret)
 682                 return ret;
 683
 684         if (amd_pinconf_get(pctldev, pins[0], config))
 685                         return -ENOTSUPP;
 686
 687         return 0;
 688 }
 689
 690 static int amd_pinconf_group_set(struct pinctrl_dev *pctldev,
 691                                 unsigned group, unsigned long *configs,
 692                                 unsigned num_configs)
 693 {
 694         const unsigned *pins;
 695         unsigned npins;
 696         int i, ret;
 697
 698         ret = amd_get_group_pins(pctldev, group, &pins, &npins);
 699         if (ret)
 700                 return ret;
 701         for (i = 0; i < npins; i++) {
 702                 if (amd_pinconf_set(pctldev, pins[i], configs, num_configs))
 703                         return -ENOTSUPP;
 704         }
 705         return 0;
 706 }
 707
 708 static const struct pinconf_ops amd_pinconf_ops = {
 709         .pin_config_get         = amd_pinconf_get,
 710         .pin_config_set         = amd_pinconf_set,
 711         .pin_config_group_get = amd_pinconf_group_get,
 712         .pin_config_group_set = amd_pinconf_group_set,
 713 };
 714
 715 static struct pinctrl_desc amd_pinctrl_desc = {
 716         .pins   = kerncz_pins,
 717         .npins = ARRAY_SIZE(kerncz_pins),
 718         .pctlops = &amd_pinctrl_ops,
 719         .confops = &amd_pinconf_ops,
 720         .owner = THIS_MODULE,
 721 };
 722
 723 static int amd_gpio_probe(struct platform_device *pdev)
 724 {
 725         int ret = 0;
 726         int irq_base;
 727         struct resource *res;
 728         struct amd_gpio *gpio_dev;
 729
 730         gpio_dev = devm_kzalloc(&pdev->dev,
 731                                 sizeof(struct amd_gpio), GFP_KERNEL);
 732         if (!gpio_dev)
 733                 return -ENOMEM;
 734
 735         spin_lock_init(&gpio_dev->lock);
 736
 737         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 738         if (!res) {
 739                 dev_err(&pdev->dev, "Failed to get gpio io resource.\n");
 740                 return -EINVAL;
 741         }
 742
 743         gpio_dev->base = devm_ioremap_nocache(&pdev->dev, res->start,
 744                                                 resource_size(res));
 745         if (!gpio_dev->base)
 746                 return -ENOMEM;
 747
 748         irq_base = platform_get_irq(pdev, 0);
 749         if (irq_base < 0) {
 750                 dev_err(&pdev->dev, "Failed to get gpio IRQ.\n");
 751                 return -EINVAL;
 752         }
 753
 754         gpio_dev->pdev = pdev;
 755         gpio_dev->gc.direction_input    = amd_gpio_direction_input;
 756         gpio_dev->gc.direction_output   = amd_gpio_direction_output;
 757         gpio_dev->gc.get                        = amd_gpio_get_value;
 758         gpio_dev->gc.set                        = amd_gpio_set_value;
 759         gpio_dev->gc.set_debounce       = amd_gpio_set_debounce;
 760         gpio_dev->gc.dbg_show           = amd_gpio_dbg_show;
 761
 762         gpio_dev->gc.base                       = 0;
 763         gpio_dev->gc.label                      = pdev->name;
 764         gpio_dev->gc.owner                      = THIS_MODULE;
 765         gpio_dev->gc.parent                     = &pdev->dev;
 766         gpio_dev->gc.ngpio                      = TOTAL_NUMBER_OF_PINS;
 767 #if defined(CONFIG_OF_GPIO)
 768         gpio_dev->gc.of_node                    = pdev->dev.of_node;
 769 #endif
 770
 771         gpio_dev->groups = kerncz_groups;
 772         gpio_dev->ngroups = ARRAY_SIZE(kerncz_groups);
 773
 774         amd_pinctrl_desc.name = dev_name(&pdev->dev);
 775         gpio_dev->pctrl = devm_pinctrl_register(&pdev->dev, &amd_pinctrl_desc,
 776                                                 gpio_dev);
 777         if (IS_ERR(gpio_dev->pctrl)) {
 778                 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
 779                 return PTR_ERR(gpio_dev->pctrl);
 780         }
 781
 782         ret = gpiochip_add_data(&gpio_dev->gc, gpio_dev);
 783         if (ret)
 784                 return ret;
 785
 786         ret = gpiochip_add_pin_range(&gpio_dev->gc, dev_name(&pdev->dev),
 787                                 0, 0, TOTAL_NUMBER_OF_PINS);
 788         if (ret) {
 789                 dev_err(&pdev->dev, "Failed to add pin range\n");
 790                 goto out2;
 791         }
 792
 793         ret = gpiochip_irqchip_add(&gpio_dev->gc,
 794                                 &amd_gpio_irqchip,
 795                                 0,
 796                                 handle_simple_irq,
 797                                 IRQ_TYPE_NONE);
 798         if (ret) {
 799                 dev_err(&pdev->dev, "could not add irqchip\n");
 800                 ret = -ENODEV;
 801                 goto out2;
 802         }
 803
 804         gpiochip_set_chained_irqchip(&gpio_dev->gc,
 805                                  &amd_gpio_irqchip,
 806                                  irq_base,
 807                                  amd_gpio_irq_handler);
 808
 809         platform_set_drvdata(pdev, gpio_dev);
 810
 811         dev_dbg(&pdev->dev, "amd gpio driver loaded\n");
 812         return ret;
 813
 814 out2:
 815         gpiochip_remove(&gpio_dev->gc);
 816
 817         return ret;
 818 }
 819
 820 static int amd_gpio_remove(struct platform_device *pdev)
 821 {
 822         struct amd_gpio *gpio_dev;
 823
 824         gpio_dev = platform_get_drvdata(pdev);
 825
 826         gpiochip_remove(&gpio_dev->gc);
 827
 828         return 0;
 829 }
 830
 831 static const struct acpi_device_id amd_gpio_acpi_match[] = {
 832         { "AMD0030", 0 },
 833         { "AMDI0030", 0},
 834         { },
 835 };
 836 MODULE_DEVICE_TABLE(acpi, amd_gpio_acpi_match);
 837
 838 static struct platform_driver amd_gpio_driver = {
 839         .driver         = {
 840                 .name   = "amd_gpio",
 841                 .acpi_match_table = ACPI_PTR(amd_gpio_acpi_match),
 842         },
 843         .probe          = amd_gpio_probe,
 844         .remove         = amd_gpio_remove,
 845 };
 846
 847 module_platform_driver(amd_gpio_driver);
 848
 849 MODULE_LICENSE("GPL v2");
 850 MODULE_AUTHOR("Ken Xue <Ken.Xue@amd.com>, Jeff Wu <Jeff.Wu@amd.com>");
 851 MODULE_DESCRIPTION("AMD GPIO pinctrl driver");