drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2018 MediaTek Inc.
   4  *
   5  * Author: Sean Wang <sean.wang@mediatek.com>
   6  *
   7  */
   8
   9 #include <dt-bindings/pinctrl/mt65xx.h>
  10 #include <linux/device.h>
  11 #include <linux/err.h>
  12 #include <linux/gpio/driver.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/io.h>
  15 #include <linux/module.h>
  16 #include <linux/of_irq.h>
  17
  18 #include "mtk-eint.h"
  19 #include "pinctrl-mtk-common-v2.h"
  20
  21 /**
  22  * struct mtk_drive_desc - the structure that holds the information
  23  *                          of the driving current
  24  * @min:        the minimum current of this group
  25  * @max:        the maximum current of this group
  26  * @step:       the step current of this group
  27  * @scal:       the weight factor
  28  *
  29  * formula: output = ((input) / step - 1) * scal
  30  */
  31 struct mtk_drive_desc {
  32         u8 min;
  33         u8 max;
  34         u8 step;
  35         u8 scal;
  36 };
  37
  38 /* The groups of drive strength */
  39 static const struct mtk_drive_desc mtk_drive[] = {
  40         [DRV_GRP0] = { 4, 16, 4, 1 },
  41         [DRV_GRP1] = { 4, 16, 4, 2 },
  42         [DRV_GRP2] = { 2, 8, 2, 1 },
  43         [DRV_GRP3] = { 2, 8, 2, 2 },
  44         [DRV_GRP4] = { 2, 16, 2, 1 },
  45 };
  46
  47 static void mtk_w32(struct mtk_pinctrl *pctl, u8 i, u32 reg, u32 val)
  48 {
  49         writel_relaxed(val, pctl->base[i] + reg);
  50 }
  51
  52 static u32 mtk_r32(struct mtk_pinctrl *pctl, u8 i, u32 reg)
  53 {
  54         return readl_relaxed(pctl->base[i] + reg);
  55 }
  56
  57 void mtk_rmw(struct mtk_pinctrl *pctl, u8 i, u32 reg, u32 mask, u32 set)
  58 {
  59         u32 val;
  60         unsigned long flags;
  61
  62         spin_lock_irqsave(&pctl->lock, flags);
  63
  64         val = mtk_r32(pctl, i, reg);
  65         val &= ~mask;
  66         val |= set;
  67         mtk_w32(pctl, i, reg, val);
  68
  69         spin_unlock_irqrestore(&pctl->lock, flags);
  70 }
  71
  72 static int mtk_hw_pin_field_lookup(struct mtk_pinctrl *hw,
  73                                    const struct mtk_pin_desc *desc,
  74                                    int field, struct mtk_pin_field *pfd)
  75 {
  76         const struct mtk_pin_field_calc *c;
  77         const struct mtk_pin_reg_calc *rc;
  78         int start = 0, end, check;
  79         bool found = false;
  80         u32 bits;
  81
  82         if (hw->soc->reg_cal && hw->soc->reg_cal[field].range) {
  83                 rc = &hw->soc->reg_cal[field];
  84         } else {
  85                 dev_dbg(hw->dev,
  86                         "Not support field %d for this soc\n", field);
  87                 return -ENOTSUPP;
  88         }
  89
  90         end = rc->nranges - 1;
  91
  92         while (start <= end) {
  93                 check = (start + end) >> 1;
  94                 if (desc->number >= rc->range[check].s_pin
  95                  && desc->number <= rc->range[check].e_pin) {
  96                         found = true;
  97                         break;
  98                 } else if (start == end)
  99                         break;
 100                 else if (desc->number < rc->range[check].s_pin)
 101                         end = check - 1;
 102                 else
 103                         start = check + 1;
 104         }
 105
 106         if (!found) {
 107                 dev_dbg(hw->dev, "Not support field %d for pin = %d (%s)\n",
 108                         field, desc->number, desc->name);
 109                 return -ENOTSUPP;
 110         }
 111
 112         c = rc->range + check;
 113
 114         if (c->i_base > hw->nbase - 1) {
 115                 dev_err(hw->dev,
 116                         "Invalid base for field %d for pin = %d (%s)\n",
 117                         field, desc->number, desc->name);
 118                 return -EINVAL;
 119         }
 120
 121         /* Calculated bits as the overall offset the pin is located at,
 122          * if c->fixed is held, that determines the all the pins in the
 123          * range use the same field with the s_pin.
 124          */
 125         bits = c->fixed ? c->s_bit : c->s_bit +
 126                (desc->number - c->s_pin) * (c->x_bits);
 127
 128         /* Fill pfd from bits. For example 32-bit register applied is assumed
 129          * when c->sz_reg is equal to 32.
 130          */
 131         pfd->index = c->i_base;
 132         pfd->offset = c->s_addr + c->x_addrs * (bits / c->sz_reg);
 133         pfd->bitpos = bits % c->sz_reg;
 134         pfd->mask = (1 << c->x_bits) - 1;
 135
 136         /* pfd->next is used for indicating that bit wrapping-around happens
 137          * which requires the manipulation for bit 0 starting in the next
 138          * register to form the complete field read/write.
 139          */
 140         pfd->next = pfd->bitpos + c->x_bits > c->sz_reg ? c->x_addrs : 0;
 141
 142         return 0;
 143 }
 144
 145 static int mtk_hw_pin_field_get(struct mtk_pinctrl *hw,
 146                                 const struct mtk_pin_desc *desc,
 147                                 int field, struct mtk_pin_field *pfd)
 148 {
 149         if (field < 0 || field >= PINCTRL_PIN_REG_MAX) {
 150                 dev_err(hw->dev, "Invalid Field %d\n", field);
 151                 return -EINVAL;
 152         }
 153
 154         return mtk_hw_pin_field_lookup(hw, desc, field, pfd);
 155 }
 156
 157 static void mtk_hw_bits_part(struct mtk_pin_field *pf, int *h, int *l)
 158 {
 159         *l = 32 - pf->bitpos;
 160         *h = get_count_order(pf->mask) - *l;
 161 }
 162
 163 static void mtk_hw_write_cross_field(struct mtk_pinctrl *hw,
 164                                      struct mtk_pin_field *pf, int value)
 165 {
 166         int nbits_l, nbits_h;
 167
 168         mtk_hw_bits_part(pf, &nbits_h, &nbits_l);
 169
 170         mtk_rmw(hw, pf->index, pf->offset, pf->mask << pf->bitpos,
 171                 (value & pf->mask) << pf->bitpos);
 172
 173         mtk_rmw(hw, pf->index, pf->offset + pf->next, BIT(nbits_h) - 1,
 174                 (value & pf->mask) >> nbits_l);
 175 }
 176
 177 static void mtk_hw_read_cross_field(struct mtk_pinctrl *hw,
 178                                     struct mtk_pin_field *pf, int *value)
 179 {
 180         int nbits_l, nbits_h, h, l;
 181
 182         mtk_hw_bits_part(pf, &nbits_h, &nbits_l);
 183
 184         l  = (mtk_r32(hw, pf->index, pf->offset)
 185               >> pf->bitpos) & (BIT(nbits_l) - 1);
 186         h  = (mtk_r32(hw, pf->index, pf->offset + pf->next))
 187               & (BIT(nbits_h) - 1);
 188
 189         *value = (h << nbits_l) | l;
 190 }
 191
 192 int mtk_hw_set_value(struct mtk_pinctrl *hw, const struct mtk_pin_desc *desc,
 193                      int field, int value)
 194 {
 195         struct mtk_pin_field pf;
 196         int err;
 197
 198         err = mtk_hw_pin_field_get(hw, desc, field, &pf);
 199         if (err)
 200                 return err;
 201
 202         if (value < 0 || value > pf.mask)
 203                 return -EINVAL;
 204
 205         if (!pf.next)
 206                 mtk_rmw(hw, pf.index, pf.offset, pf.mask << pf.bitpos,
 207                         (value & pf.mask) << pf.bitpos);
 208         else
 209                 mtk_hw_write_cross_field(hw, &pf, value);
 210
 211         return 0;
 212 }
 213 EXPORT_SYMBOL_GPL(mtk_hw_set_value);
 214
 215 int mtk_hw_get_value(struct mtk_pinctrl *hw, const struct mtk_pin_desc *desc,
 216                      int field, int *value)
 217 {
 218         struct mtk_pin_field pf;
 219         int err;
 220
 221         err = mtk_hw_pin_field_get(hw, desc, field, &pf);
 222         if (err)
 223                 return err;
 224
 225         if (!pf.next)
 226                 *value = (mtk_r32(hw, pf.index, pf.offset)
 227                           >> pf.bitpos) & pf.mask;
 228         else
 229                 mtk_hw_read_cross_field(hw, &pf, value);
 230
 231         return 0;
 232 }
 233 EXPORT_SYMBOL_GPL(mtk_hw_get_value);
 234
 235 static int mtk_xt_find_eint_num(struct mtk_pinctrl *hw, unsigned long eint_n)
 236 {
 237         const struct mtk_pin_desc *desc;
 238         int i = 0;
 239
 240         desc = (const struct mtk_pin_desc *)hw->soc->pins;
 241
 242         while (i < hw->soc->npins) {
 243                 if (desc[i].eint.eint_n == eint_n)
 244                         return desc[i].number;
 245                 i++;
 246         }
 247
 248         return EINT_NA;
 249 }
 250
 251 /*
 252  * Virtual GPIO only used inside SOC and not being exported to outside SOC.
 253  * Some modules use virtual GPIO as eint (e.g. pmif or usb).
 254  * In MTK platform, external interrupt (EINT) and GPIO is 1-1 mapping
 255  * and we can set GPIO as eint.
 256  * But some modules use specific eint which doesn't have real GPIO pin.
 257  * So we use virtual GPIO to map it.
 258  */
 259
 260 bool mtk_is_virt_gpio(struct mtk_pinctrl *hw, unsigned int gpio_n)
 261 {
 262         const struct mtk_pin_desc *desc;
 263         bool virt_gpio = false;
 264
 265         desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio_n];
 266
 267         /* if the GPIO is not supported for eint mode */
 268         if (desc->eint.eint_m == NO_EINT_SUPPORT)
 269                 return virt_gpio;
 270
 271         if (desc->funcs && !desc->funcs[desc->eint.eint_m].name)
 272                 virt_gpio = true;
 273
 274         return virt_gpio;
 275 }
 276 EXPORT_SYMBOL_GPL(mtk_is_virt_gpio);
 277
 278 static int mtk_xt_get_gpio_n(void *data, unsigned long eint_n,
 279                              unsigned int *gpio_n,
 280                              struct gpio_chip **gpio_chip)
 281 {
 282         struct mtk_pinctrl *hw = (struct mtk_pinctrl *)data;
 283         const struct mtk_pin_desc *desc;
 284
 285         desc = (const struct mtk_pin_desc *)hw->soc->pins;
 286         *gpio_chip = &hw->chip;
 287
 288         /*
 289          * Be greedy to guess first gpio_n is equal to eint_n.
 290          * Only eint virtual eint number is greater than gpio number.
 291          */
 292         if (hw->soc->npins > eint_n &&
 293             desc[eint_n].eint.eint_n == eint_n)
 294                 *gpio_n = eint_n;
 295         else
 296                 *gpio_n = mtk_xt_find_eint_num(hw, eint_n);
 297
 298         return *gpio_n == EINT_NA ? -EINVAL : 0;
 299 }
 300
 301 static int mtk_xt_get_gpio_state(void *data, unsigned long eint_n)
 302 {
 303         struct mtk_pinctrl *hw = (struct mtk_pinctrl *)data;
 304         const struct mtk_pin_desc *desc;
 305         struct gpio_chip *gpio_chip;
 306         unsigned int gpio_n;
 307         int value, err;
 308
 309         err = mtk_xt_get_gpio_n(hw, eint_n, &gpio_n, &gpio_chip);
 310         if (err)
 311                 return err;
 312
 313         desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio_n];
 314
 315         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DI, &value);
 316         if (err)
 317                 return err;
 318
 319         return !!value;
 320 }
 321
 322 static int mtk_xt_set_gpio_as_eint(void *data, unsigned long eint_n)
 323 {
 324         struct mtk_pinctrl *hw = (struct mtk_pinctrl *)data;
 325         const struct mtk_pin_desc *desc;
 326         struct gpio_chip *gpio_chip;
 327         unsigned int gpio_n;
 328         int err;
 329
 330         err = mtk_xt_get_gpio_n(hw, eint_n, &gpio_n, &gpio_chip);
 331         if (err)
 332                 return err;
 333
 334         if (mtk_is_virt_gpio(hw, gpio_n))
 335                 return 0;
 336
 337         desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio_n];
 338
 339         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_MODE,
 340                                desc->eint.eint_m);
 341         if (err)
 342                 return err;
 343
 344         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, MTK_INPUT);
 345         if (err)
 346                 return err;
 347
 348         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT, MTK_ENABLE);
 349         /* SMT is supposed to be supported by every real GPIO and doesn't
 350          * support virtual GPIOs, so the extra condition err != -ENOTSUPP
 351          * is just for adding EINT support to these virtual GPIOs. It should
 352          * add an extra flag in the pin descriptor when more pins with
 353          * distinctive characteristic come out.
 354          */
 355         if (err && err != -ENOTSUPP)
 356                 return err;
 357
 358         return 0;
 359 }
 360
 361 static const struct mtk_eint_xt mtk_eint_xt = {
 362         .get_gpio_n = mtk_xt_get_gpio_n,
 363         .get_gpio_state = mtk_xt_get_gpio_state,
 364         .set_gpio_as_eint = mtk_xt_set_gpio_as_eint,
 365 };
 366
 367 int mtk_build_eint(struct mtk_pinctrl *hw, struct platform_device *pdev)
 368 {
 369         struct device_node *np = pdev->dev.of_node;
 370         int ret;
 371
 372         if (!IS_ENABLED(CONFIG_EINT_MTK))
 373                 return 0;
 374
 375         if (!of_property_read_bool(np, "interrupt-controller"))
 376                 return -ENODEV;
 377
 378         hw->eint = devm_kzalloc(hw->dev, sizeof(*hw->eint), GFP_KERNEL);
 379         if (!hw->eint)
 380                 return -ENOMEM;
 381
 382         hw->eint->base = devm_platform_ioremap_resource_byname(pdev, "eint");
 383         if (IS_ERR(hw->eint->base)) {
 384                 ret = PTR_ERR(hw->eint->base);
 385                 goto err_free_eint;
 386         }
 387
 388         hw->eint->irq = irq_of_parse_and_map(np, 0);
 389         if (!hw->eint->irq) {
 390                 ret = -EINVAL;
 391                 goto err_free_eint;
 392         }
 393
 394         if (!hw->soc->eint_hw) {
 395                 ret = -ENODEV;
 396                 goto err_free_eint;
 397         }
 398
 399         hw->eint->dev = &pdev->dev;
 400         hw->eint->hw = hw->soc->eint_hw;
 401         hw->eint->pctl = hw;
 402         hw->eint->gpio_xlate = &mtk_eint_xt;
 403
 404         return mtk_eint_do_init(hw->eint);
 405
 406 err_free_eint:
 407         devm_kfree(hw->dev, hw->eint);
 408         hw->eint = NULL;
 409         return ret;
 410 }
 411 EXPORT_SYMBOL_GPL(mtk_build_eint);
 412
 413 /* Revision 0 */
 414 int mtk_pinconf_bias_disable_set(struct mtk_pinctrl *hw,
 415                                  const struct mtk_pin_desc *desc)
 416 {
 417         int err;
 418
 419         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PU,
 420                                MTK_DISABLE);
 421         if (err)
 422                 return err;
 423
 424         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PD,
 425                                MTK_DISABLE);
 426         if (err)
 427                 return err;
 428
 429         return 0;
 430 }
 431 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_disable_set);
 432
 433 int mtk_pinconf_bias_disable_get(struct mtk_pinctrl *hw,
 434                                  const struct mtk_pin_desc *desc, int *res)
 435 {
 436         int v, v2;
 437         int err;
 438
 439         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PU, &v);
 440         if (err)
 441                 return err;
 442
 443         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PD, &v2);
 444         if (err)
 445                 return err;
 446
 447         if (v == MTK_ENABLE || v2 == MTK_ENABLE)
 448                 return -EINVAL;
 449
 450         *res = 1;
 451
 452         return 0;
 453 }
 454 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_disable_get);
 455
 456 int mtk_pinconf_bias_set(struct mtk_pinctrl *hw,
 457                          const struct mtk_pin_desc *desc, bool pullup)
 458 {
 459         int err, arg;
 460
 461         arg = pullup ? 1 : 2;
 462
 463         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PU, arg & 1);
 464         if (err)
 465                 return err;
 466
 467         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PD,
 468                                !!(arg & 2));
 469         if (err)
 470                 return err;
 471
 472         return 0;
 473 }
 474 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_set);
 475
 476 int mtk_pinconf_bias_get(struct mtk_pinctrl *hw,
 477                          const struct mtk_pin_desc *desc, bool pullup, int *res)
 478 {
 479         int reg, err, v;
 480
 481         reg = pullup ? PINCTRL_PIN_REG_PU : PINCTRL_PIN_REG_PD;
 482
 483         err = mtk_hw_get_value(hw, desc, reg, &v);
 484         if (err)
 485                 return err;
 486
 487         if (!v)
 488                 return -EINVAL;
 489
 490         *res = 1;
 491
 492         return 0;
 493 }
 494 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_get);
 495
 496 /* Revision 1 */
 497 int mtk_pinconf_bias_disable_set_rev1(struct mtk_pinctrl *hw,
 498                                       const struct mtk_pin_desc *desc)
 499 {
 500         return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PULLEN,
 501                                 MTK_DISABLE);
 502 }
 503 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_disable_set_rev1);
 504
 505 int mtk_pinconf_bias_disable_get_rev1(struct mtk_pinctrl *hw,
 506                                       const struct mtk_pin_desc *desc, int *res)
 507 {
 508         int v, err;
 509
 510         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PULLEN, &v);
 511         if (err)
 512                 return err;
 513
 514         if (v == MTK_ENABLE)
 515                 return -EINVAL;
 516
 517         *res = 1;
 518
 519         return 0;
 520 }
 521 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_disable_get_rev1);
 522
 523 int mtk_pinconf_bias_set_rev1(struct mtk_pinctrl *hw,
 524                               const struct mtk_pin_desc *desc, bool pullup)
 525 {
 526         int err, arg;
 527
 528         arg = pullup ? MTK_PULLUP : MTK_PULLDOWN;
 529
 530         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PULLEN,
 531                                MTK_ENABLE);
 532         if (err)
 533                 return err;
 534
 535         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PULLSEL, arg);
 536         if (err)
 537                 return err;
 538
 539         return 0;
 540 }
 541 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_set_rev1);
 542
 543 int mtk_pinconf_bias_get_rev1(struct mtk_pinctrl *hw,
 544                               const struct mtk_pin_desc *desc, bool pullup,
 545                               int *res)
 546 {
 547         int err, v;
 548
 549         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PULLEN, &v);
 550         if (err)
 551                 return err;
 552
 553         if (v == MTK_DISABLE)
 554                 return -EINVAL;
 555
 556         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PULLSEL, &v);
 557         if (err)
 558                 return err;
 559
 560         if (pullup ^ (v == MTK_PULLUP))
 561                 return -EINVAL;
 562
 563         *res = 1;
 564
 565         return 0;
 566 }
 567 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_get_rev1);
 568
 569 /* Combo for the following pull register type:
 570  * 1. PU + PD
 571  * 2. PULLSEL + PULLEN
 572  * 3. PUPD + R0 + R1
 573  */
 574 static int mtk_pinconf_bias_set_pu_pd(struct mtk_pinctrl *hw,
 575                                 const struct mtk_pin_desc *desc,
 576                                 u32 pullup, u32 arg)
 577 {
 578         int err, pu, pd;
 579
 580         if (arg == MTK_DISABLE) {
 581                 pu = 0;
 582                 pd = 0;
 583         } else if ((arg == MTK_ENABLE) && pullup) {
 584                 pu = 1;
 585                 pd = 0;
 586         } else if ((arg == MTK_ENABLE) && !pullup) {
 587                 pu = 0;
 588                 pd = 1;
 589         } else {
 590                 err = -EINVAL;
 591                 goto out;
 592         }
 593
 594         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PU, pu);
 595         if (err)
 596                 goto out;
 597
 598         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PD, pd);
 599
 600 out:
 601         return err;
 602 }
 603
 604 static int mtk_pinconf_bias_set_pullsel_pullen(struct mtk_pinctrl *hw,
 605                                 const struct mtk_pin_desc *desc,
 606                                 u32 pullup, u32 arg)
 607 {
 608         int err, enable;
 609
 610         if (arg == MTK_DISABLE)
 611                 enable = 0;
 612         else if (arg == MTK_ENABLE)
 613                 enable = 1;
 614         else {
 615                 err = -EINVAL;
 616                 goto out;
 617         }
 618
 619         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PULLEN, enable);
 620         if (err)
 621                 goto out;
 622
 623         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PULLSEL, pullup);
 624
 625 out:
 626         return err;
 627 }
 628
 629 static int mtk_pinconf_bias_set_pupd_r1_r0(struct mtk_pinctrl *hw,
 630                                 const struct mtk_pin_desc *desc,
 631                                 u32 pullup, u32 arg)
 632 {
 633         int err, r0, r1;
 634
 635         if ((arg == MTK_DISABLE) || (arg == MTK_PUPD_SET_R1R0_00)) {
 636                 pullup = 0;
 637                 r0 = 0;
 638                 r1 = 0;
 639         } else if (arg == MTK_PUPD_SET_R1R0_01) {
 640                 r0 = 1;
 641                 r1 = 0;
 642         } else if (arg == MTK_PUPD_SET_R1R0_10) {
 643                 r0 = 0;
 644                 r1 = 1;
 645         } else if (arg == MTK_PUPD_SET_R1R0_11) {
 646                 r0 = 1;
 647                 r1 = 1;
 648         } else {
 649                 err = -EINVAL;
 650                 goto out;
 651         }
 652
 653         /* MTK HW PUPD bit: 1 for pull-down, 0 for pull-up */
 654         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PUPD, !pullup);
 655         if (err)
 656                 goto out;
 657
 658         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_R0, r0);
 659         if (err)
 660                 goto out;
 661
 662         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_R1, r1);
 663
 664 out:
 665         return err;
 666 }
 667
 668 static int mtk_hw_pin_rsel_lookup(struct mtk_pinctrl *hw,
 669                                   const struct mtk_pin_desc *desc,
 670                                   u32 pullup, u32 arg, u32 *rsel_val)
 671 {
 672         const struct mtk_pin_rsel *rsel;
 673         int check;
 674         bool found = false;
 675
 676         rsel = hw->soc->pin_rsel;
 677
 678         for (check = 0; check <= hw->soc->npin_rsel - 1; check++) {
 679                 if (desc->number >= rsel[check].s_pin &&
 680                     desc->number <= rsel[check].e_pin) {
 681                         if (pullup) {
 682                                 if (rsel[check].up_rsel == arg) {
 683                                         found = true;
 684                                         *rsel_val = rsel[check].rsel_index;
 685                                         break;
 686                                 }
 687                         } else {
 688                                 if (rsel[check].down_rsel == arg) {
 689                                         found = true;
 690                                         *rsel_val = rsel[check].rsel_index;
 691                                         break;
 692                                 }
 693                         }
 694                 }
 695         }
 696
 697         if (!found) {
 698                 dev_err(hw->dev, "Not support rsel value %d Ohm for pin = %d (%s)\n",
 699                         arg, desc->number, desc->name);
 700                 return -ENOTSUPP;
 701         }
 702
 703         return 0;
 704 }
 705
 706 static int mtk_pinconf_bias_set_rsel(struct mtk_pinctrl *hw,
 707                                      const struct mtk_pin_desc *desc,
 708                                      u32 pullup, u32 arg)
 709 {
 710         int err, rsel_val;
 711
 712         if (hw->rsel_si_unit) {
 713                 /* find pin rsel_index from pin_rsel array*/
 714                 err = mtk_hw_pin_rsel_lookup(hw, desc, pullup, arg, &rsel_val);
 715                 if (err)
 716                         return err;
 717         } else {
 718                 if (arg < MTK_PULL_SET_RSEL_000 || arg > MTK_PULL_SET_RSEL_111)
 719                         return -EINVAL;
 720
 721                 rsel_val = arg - MTK_PULL_SET_RSEL_000;
 722         }
 723
 724         return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_RSEL, rsel_val);
 725 }
 726
 727 static int mtk_pinconf_bias_set_pu_pd_rsel(struct mtk_pinctrl *hw,
 728                                            const struct mtk_pin_desc *desc,
 729                                            u32 pullup, u32 arg)
 730 {
 731         u32 enable = arg == MTK_DISABLE ? MTK_DISABLE : MTK_ENABLE;
 732         int err;
 733
 734         if (arg != MTK_DISABLE) {
 735                 err = mtk_pinconf_bias_set_rsel(hw, desc, pullup, arg);
 736                 if (err)
 737                         return err;
 738         }
 739
 740         return mtk_pinconf_bias_set_pu_pd(hw, desc, pullup, enable);
 741 }
 742
 743 int mtk_pinconf_bias_set_combo(struct mtk_pinctrl *hw,
 744                                const struct mtk_pin_desc *desc,
 745                                u32 pullup, u32 arg)
 746 {
 747         int err = -ENOTSUPP;
 748         u32 try_all_type;
 749
 750         if (hw->soc->pull_type)
 751                 try_all_type = hw->soc->pull_type[desc->number];
 752         else
 753                 try_all_type = MTK_PULL_TYPE_MASK;
 754
 755         if (try_all_type & MTK_PULL_RSEL_TYPE) {
 756                 err = mtk_pinconf_bias_set_pu_pd_rsel(hw, desc, pullup, arg);
 757                 if (!err)
 758                         return 0;
 759         }
 760
 761         if (try_all_type & MTK_PULL_PU_PD_TYPE) {
 762                 err = mtk_pinconf_bias_set_pu_pd(hw, desc, pullup, arg);
 763                 if (!err)
 764                         return 0;
 765         }
 766
 767         if (try_all_type & MTK_PULL_PULLSEL_TYPE) {
 768                 err = mtk_pinconf_bias_set_pullsel_pullen(hw, desc,
 769                                                           pullup, arg);
 770                 if (!err)
 771                         return 0;
 772         }
 773
 774         if (try_all_type & MTK_PULL_PUPD_R1R0_TYPE)
 775                 err = mtk_pinconf_bias_set_pupd_r1_r0(hw, desc, pullup, arg);
 776
 777         if (err)
 778                 dev_err(hw->dev, "Invalid pull argument\n");
 779
 780         return err;
 781 }
 782 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_set_combo);
 783
 784 static int mtk_rsel_get_si_unit(struct mtk_pinctrl *hw,
 785                                 const struct mtk_pin_desc *desc,
 786                                 u32 pullup, u32 rsel_val, u32 *si_unit)
 787 {
 788         const struct mtk_pin_rsel *rsel;
 789         int check;
 790
 791         rsel = hw->soc->pin_rsel;
 792
 793         for (check = 0; check <= hw->soc->npin_rsel - 1; check++) {
 794                 if (desc->number >= rsel[check].s_pin &&
 795                     desc->number <= rsel[check].e_pin) {
 796                         if (rsel_val == rsel[check].rsel_index) {
 797                                 if (pullup)
 798                                         *si_unit = rsel[check].up_rsel;
 799                                 else
 800                                         *si_unit = rsel[check].down_rsel;
 801                                 break;
 802                         }
 803                 }
 804         }
 805
 806         return 0;
 807 }
 808
 809 static int mtk_pinconf_bias_get_pu_pd_rsel(struct mtk_pinctrl *hw,
 810                                            const struct mtk_pin_desc *desc,
 811                                            u32 *pullup, u32 *enable)
 812 {
 813         int pu, pd, rsel, err;
 814
 815         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_RSEL, &rsel);
 816         if (err)
 817                 goto out;
 818
 819         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PU, &pu);
 820         if (err)
 821                 goto out;
 822
 823         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PD, &pd);
 824         if (err)
 825                 goto out;
 826
 827         if (pu == 0 && pd == 0) {
 828                 *pullup = 0;
 829                 *enable = MTK_DISABLE;
 830         } else if (pu == 1 && pd == 0) {
 831                 *pullup = 1;
 832                 if (hw->rsel_si_unit)
 833                         mtk_rsel_get_si_unit(hw, desc, *pullup, rsel, enable);
 834                 else
 835                         *enable = rsel + MTK_PULL_SET_RSEL_000;
 836         } else if (pu == 0 && pd == 1) {
 837                 *pullup = 0;
 838                 if (hw->rsel_si_unit)
 839                         mtk_rsel_get_si_unit(hw, desc, *pullup, rsel, enable);
 840                 else
 841                         *enable = rsel + MTK_PULL_SET_RSEL_000;
 842         } else {
 843                 err = -EINVAL;
 844                 goto out;
 845         }
 846
 847 out:
 848         return err;
 849 }
 850
 851 static int mtk_pinconf_bias_get_pu_pd(struct mtk_pinctrl *hw,
 852                                 const struct mtk_pin_desc *desc,
 853                                 u32 *pullup, u32 *enable)
 854 {
 855         int err, pu, pd;
 856
 857         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PU, &pu);
 858         if (err)
 859                 goto out;
 860
 861         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PD, &pd);
 862         if (err)
 863                 goto out;
 864
 865         if (pu == 0 && pd == 0) {
 866                 *pullup = 0;
 867                 *enable = MTK_DISABLE;
 868         } else if (pu == 1 && pd == 0) {
 869                 *pullup = 1;
 870                 *enable = MTK_ENABLE;
 871         } else if (pu == 0 && pd == 1) {
 872                 *pullup = 0;
 873                 *enable = MTK_ENABLE;
 874         } else
 875                 err = -EINVAL;
 876
 877 out:
 878         return err;
 879 }
 880
 881 static int mtk_pinconf_bias_get_pullsel_pullen(struct mtk_pinctrl *hw,
 882                                 const struct mtk_pin_desc *desc,
 883                                 u32 *pullup, u32 *enable)
 884 {
 885         int err;
 886
 887         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PULLSEL, pullup);
 888         if (err)
 889                 goto out;
 890
 891         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PULLEN, enable);
 892
 893 out:
 894         return err;
 895 }
 896
 897 static int mtk_pinconf_bias_get_pupd_r1_r0(struct mtk_pinctrl *hw,
 898                                 const struct mtk_pin_desc *desc,
 899                                 u32 *pullup, u32 *enable)
 900 {
 901         int err, r0, r1;
 902
 903         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PUPD, pullup);
 904         if (err)
 905                 goto out;
 906         /* MTK HW PUPD bit: 1 for pull-down, 0 for pull-up */
 907         *pullup = !(*pullup);
 908
 909         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_R0, &r0);
 910         if (err)
 911                 goto out;
 912
 913         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_R1, &r1);
 914         if (err)
 915                 goto out;
 916
 917         if ((r1 == 0) && (r0 == 0))
 918                 *enable = MTK_PUPD_SET_R1R0_00;
 919         else if ((r1 == 0) && (r0 == 1))
 920                 *enable = MTK_PUPD_SET_R1R0_01;
 921         else if ((r1 == 1) && (r0 == 0))
 922                 *enable = MTK_PUPD_SET_R1R0_10;
 923         else if ((r1 == 1) && (r0 == 1))
 924                 *enable = MTK_PUPD_SET_R1R0_11;
 925         else
 926                 err = -EINVAL;
 927
 928 out:
 929         return err;
 930 }
 931
 932 int mtk_pinconf_bias_get_combo(struct mtk_pinctrl *hw,
 933                               const struct mtk_pin_desc *desc,
 934                               u32 *pullup, u32 *enable)
 935 {
 936         int err = -ENOTSUPP;
 937         u32 try_all_type;
 938
 939         if (hw->soc->pull_type)
 940                 try_all_type = hw->soc->pull_type[desc->number];
 941         else
 942                 try_all_type = MTK_PULL_TYPE_MASK;
 943
 944         if (try_all_type & MTK_PULL_RSEL_TYPE) {
 945                 err = mtk_pinconf_bias_get_pu_pd_rsel(hw, desc, pullup, enable);
 946                 if (!err)
 947                         return 0;
 948         }
 949
 950         if (try_all_type & MTK_PULL_PU_PD_TYPE) {
 951                 err = mtk_pinconf_bias_get_pu_pd(hw, desc, pullup, enable);
 952                 if (!err)
 953                         return 0;
 954         }
 955
 956         if (try_all_type & MTK_PULL_PULLSEL_TYPE) {
 957                 err = mtk_pinconf_bias_get_pullsel_pullen(hw, desc,
 958                                                           pullup, enable);
 959                 if (!err)
 960                         return 0;
 961         }
 962
 963         if (try_all_type & MTK_PULL_PUPD_R1R0_TYPE)
 964                 err = mtk_pinconf_bias_get_pupd_r1_r0(hw, desc, pullup, enable);
 965
 966         return err;
 967 }
 968 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_get_combo);
 969
 970 /* Revision 0 */
 971 int mtk_pinconf_drive_set(struct mtk_pinctrl *hw,
 972                           const struct mtk_pin_desc *desc, u32 arg)
 973 {
 974         const struct mtk_drive_desc *tb;
 975         int err = -ENOTSUPP;
 976
 977         tb = &mtk_drive[desc->drv_n];
 978         /* 4mA when (e8, e4) = (0, 0)
 979          * 8mA when (e8, e4) = (0, 1)
 980          * 12mA when (e8, e4) = (1, 0)
 981          * 16mA when (e8, e4) = (1, 1)
 982          */
 983         if ((arg >= tb->min && arg <= tb->max) && !(arg % tb->step)) {
 984                 arg = (arg / tb->step - 1) * tb->scal;
 985                 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_E4,
 986                                        arg & 0x1);
 987                 if (err)
 988                         return err;
 989
 990                 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_E8,
 991                                        (arg & 0x2) >> 1);
 992                 if (err)
 993                         return err;
 994         }
 995
 996         return err;
 997 }
 998 EXPORT_SYMBOL_GPL(mtk_pinconf_drive_set);
 999
1000 int mtk_pinconf_drive_get(struct mtk_pinctrl *hw,
1001                           const struct mtk_pin_desc *desc, int *val)
1002 {
1003         const struct mtk_drive_desc *tb;
1004         int err, val1, val2;
1005
1006         tb = &mtk_drive[desc->drv_n];
1007
1008         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_E4, &val1);
1009         if (err)
1010                 return err;
1011
1012         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_E8, &val2);
1013         if (err)
1014                 return err;
1015
1016         /* 4mA when (e8, e4) = (0, 0); 8mA when (e8, e4) = (0, 1)
1017          * 12mA when (e8, e4) = (1, 0); 16mA when (e8, e4) = (1, 1)
1018          */
1019         *val = (((val2 << 1) + val1) / tb->scal + 1) * tb->step;
1020
1021         return 0;
1022 }
1023 EXPORT_SYMBOL_GPL(mtk_pinconf_drive_get);
1024
1025 /* Revision 1 */
1026 int mtk_pinconf_drive_set_rev1(struct mtk_pinctrl *hw,
1027                                const struct mtk_pin_desc *desc, u32 arg)
1028 {
1029         const struct mtk_drive_desc *tb;
1030         int err = -ENOTSUPP;
1031
1032         tb = &mtk_drive[desc->drv_n];
1033
1034         if ((arg >= tb->min && arg <= tb->max) && !(arg % tb->step)) {
1035                 arg = (arg / tb->step - 1) * tb->scal;
1036
1037                 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DRV,
1038                                        arg);
1039                 if (err)
1040                         return err;
1041         }
1042
1043         return err;
1044 }
1045 EXPORT_SYMBOL_GPL(mtk_pinconf_drive_set_rev1);
1046
1047 int mtk_pinconf_drive_get_rev1(struct mtk_pinctrl *hw,
1048                                const struct mtk_pin_desc *desc, int *val)
1049 {
1050         const struct mtk_drive_desc *tb;
1051         int err, val1;
1052
1053         tb = &mtk_drive[desc->drv_n];
1054
1055         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DRV, &val1);
1056         if (err)
1057                 return err;
1058
1059         *val = ((val1 & 0x7) / tb->scal + 1) * tb->step;
1060
1061         return 0;
1062 }
1063 EXPORT_SYMBOL_GPL(mtk_pinconf_drive_get_rev1);
1064
1065 int mtk_pinconf_drive_set_raw(struct mtk_pinctrl *hw,
1066                                const struct mtk_pin_desc *desc, u32 arg)
1067 {
1068         return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DRV, arg);
1069 }
1070 EXPORT_SYMBOL_GPL(mtk_pinconf_drive_set_raw);
1071
1072 int mtk_pinconf_drive_get_raw(struct mtk_pinctrl *hw,
1073                                const struct mtk_pin_desc *desc, int *val)
1074 {
1075         return mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DRV, val);
1076 }
1077 EXPORT_SYMBOL_GPL(mtk_pinconf_drive_get_raw);
1078
1079 int mtk_pinconf_adv_pull_set(struct mtk_pinctrl *hw,
1080                              const struct mtk_pin_desc *desc, bool pullup,
1081                              u32 arg)
1082 {
1083         int err;
1084
1085         /* 10K off & 50K (75K) off, when (R0, R1) = (0, 0);
1086          * 10K off & 50K (75K) on, when (R0, R1) = (0, 1);
1087          * 10K on & 50K (75K) off, when (R0, R1) = (1, 0);
1088          * 10K on & 50K (75K) on, when (R0, R1) = (1, 1)
1089          */
1090         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_R0, arg & 1);
1091         if (err)
1092                 return 0;
1093
1094         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_R1,
1095                                !!(arg & 2));
1096         if (err)
1097                 return 0;
1098
1099         arg = pullup ? 0 : 1;
1100
1101         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PUPD, arg);
1102
1103         /* If PUPD register is not supported for that pin, let's fallback to
1104          * general bias control.
1105          */
1106         if (err == -ENOTSUPP) {
1107                 if (hw->soc->bias_set) {
1108                         err = hw->soc->bias_set(hw, desc, pullup);
1109                         if (err)
1110                                 return err;
1111                 } else {
1112                         err = mtk_pinconf_bias_set_rev1(hw, desc, pullup);
1113                         if (err)
1114                                 err = mtk_pinconf_bias_set(hw, desc, pullup);
1115                 }
1116         }
1117
1118         return err;
1119 }
1120 EXPORT_SYMBOL_GPL(mtk_pinconf_adv_pull_set);
1121
1122 int mtk_pinconf_adv_pull_get(struct mtk_pinctrl *hw,
1123                              const struct mtk_pin_desc *desc, bool pullup,
1124                              u32 *val)
1125 {
1126         u32 t, t2;
1127         int err;
1128
1129         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PUPD, &t);
1130
1131         /* If PUPD register is not supported for that pin, let's fallback to
1132          * general bias control.
1133          */
1134         if (err == -ENOTSUPP) {
1135                 if (hw->soc->bias_get) {
1136                         err = hw->soc->bias_get(hw, desc, pullup, val);
1137                         if (err)
1138                                 return err;
1139                 } else {
1140                         return -ENOTSUPP;
1141                 }
1142         } else {
1143                 /* t == 0 supposes PULLUP for the customized PULL setup */
1144                 if (err)
1145                         return err;
1146
1147                 if (pullup ^ !t)
1148                         return -EINVAL;
1149         }
1150
1151         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_R0, &t);
1152         if (err)
1153                 return err;
1154
1155         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_R1, &t2);
1156         if (err)
1157                 return err;
1158
1159         *val = (t | t2 << 1) & 0x7;
1160
1161         return 0;
1162 }
1163 EXPORT_SYMBOL_GPL(mtk_pinconf_adv_pull_get);
1164
1165 int mtk_pinconf_adv_drive_set(struct mtk_pinctrl *hw,
1166                               const struct mtk_pin_desc *desc, u32 arg)
1167 {
1168         int err;
1169         int en = arg & 1;
1170         int e0 = !!(arg & 2);
1171         int e1 = !!(arg & 4);
1172
1173         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DRV_EN, en);
1174         if (err)
1175                 return err;
1176
1177         if (!en)
1178                 return err;
1179
1180         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DRV_E0, e0);
1181         if (err)
1182                 return err;
1183
1184         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DRV_E1, e1);
1185         if (err)
1186                 return err;
1187
1188         return err;
1189 }
1190 EXPORT_SYMBOL_GPL(mtk_pinconf_adv_drive_set);
1191
1192 int mtk_pinconf_adv_drive_get(struct mtk_pinctrl *hw,
1193                               const struct mtk_pin_desc *desc, u32 *val)
1194 {
1195         u32 en, e0, e1;
1196         int err;
1197
1198         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DRV_EN, &en);
1199         if (err)
1200                 return err;
1201
1202         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DRV_E0, &e0);
1203         if (err)
1204                 return err;
1205
1206         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DRV_E1, &e1);
1207         if (err)
1208                 return err;
1209
1210         *val = (en | e0 << 1 | e1 << 2) & 0x7;
1211
1212         return 0;
1213 }
1214 EXPORT_SYMBOL_GPL(mtk_pinconf_adv_drive_get);
1215
1216 int mtk_pinconf_adv_drive_set_raw(struct mtk_pinctrl *hw,
1217                                   const struct mtk_pin_desc *desc, u32 arg)
1218 {
1219         return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DRV_ADV, arg);
1220 }
1221 EXPORT_SYMBOL_GPL(mtk_pinconf_adv_drive_set_raw);
1222
1223 int mtk_pinconf_adv_drive_get_raw(struct mtk_pinctrl *hw,
1224                                   const struct mtk_pin_desc *desc, u32 *val)
1225 {
1226         return mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DRV_ADV, val);
1227 }
1228 EXPORT_SYMBOL_GPL(mtk_pinconf_adv_drive_get_raw);
1229
1230 MODULE_LICENSE("GPL v2");
1231 MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
1232 MODULE_DESCRIPTION("Pin configuration library module for mediatek SoCs");