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
  61         val = mtk_r32(pctl, i, reg);
  62         val &= ~mask;
  63         val |= set;
  64         mtk_w32(pctl, i, reg, val);
  65 }
  66
  67 static int mtk_hw_pin_field_lookup(struct mtk_pinctrl *hw,
  68                                    const struct mtk_pin_desc *desc,
  69                                    int field, struct mtk_pin_field *pfd)
  70 {
  71         const struct mtk_pin_field_calc *c;
  72         const struct mtk_pin_reg_calc *rc;
  73         int start = 0, end, check;
  74         bool found = false;
  75         u32 bits;
  76
  77         if (hw->soc->reg_cal && hw->soc->reg_cal[field].range) {
  78                 rc = &hw->soc->reg_cal[field];
  79         } else {
  80                 dev_dbg(hw->dev,
  81                         "Not support field %d for this soc\n", field);
  82                 return -ENOTSUPP;
  83         }
  84
  85         end = rc->nranges - 1;
  86
  87         while (start <= end) {
  88                 check = (start + end) >> 1;
  89                 if (desc->number >= rc->range[check].s_pin
  90                  && desc->number <= rc->range[check].e_pin) {
  91                         found = true;
  92                         break;
  93                 } else if (start == end)
  94                         break;
  95                 else if (desc->number < rc->range[check].s_pin)
  96                         end = check - 1;
  97                 else
  98                         start = check + 1;
  99         }
 100
 101         if (!found) {
 102                 dev_dbg(hw->dev, "Not support field %d for pin = %d (%s)\n",
 103                         field, desc->number, desc->name);
 104                 return -ENOTSUPP;
 105         }
 106
 107         c = rc->range + check;
 108
 109         if (c->i_base > hw->nbase - 1) {
 110                 dev_err(hw->dev,
 111                         "Invalid base for field %d for pin = %d (%s)\n",
 112                         field, desc->number, desc->name);
 113                 return -EINVAL;
 114         }
 115
 116         /* Calculated bits as the overall offset the pin is located at,
 117          * if c->fixed is held, that determines the all the pins in the
 118          * range use the same field with the s_pin.
 119          */
 120         bits = c->fixed ? c->s_bit : c->s_bit +
 121                (desc->number - c->s_pin) * (c->x_bits);
 122
 123         /* Fill pfd from bits. For example 32-bit register applied is assumed
 124          * when c->sz_reg is equal to 32.
 125          */
 126         pfd->index = c->i_base;
 127         pfd->offset = c->s_addr + c->x_addrs * (bits / c->sz_reg);
 128         pfd->bitpos = bits % c->sz_reg;
 129         pfd->mask = (1 << c->x_bits) - 1;
 130
 131         /* pfd->next is used for indicating that bit wrapping-around happens
 132          * which requires the manipulation for bit 0 starting in the next
 133          * register to form the complete field read/write.
 134          */
 135         pfd->next = pfd->bitpos + c->x_bits > c->sz_reg ? c->x_addrs : 0;
 136
 137         return 0;
 138 }
 139
 140 static int mtk_hw_pin_field_get(struct mtk_pinctrl *hw,
 141                                 const struct mtk_pin_desc *desc,
 142                                 int field, struct mtk_pin_field *pfd)
 143 {
 144         if (field < 0 || field >= PINCTRL_PIN_REG_MAX) {
 145                 dev_err(hw->dev, "Invalid Field %d\n", field);
 146                 return -EINVAL;
 147         }
 148
 149         return mtk_hw_pin_field_lookup(hw, desc, field, pfd);
 150 }
 151
 152 static void mtk_hw_bits_part(struct mtk_pin_field *pf, int *h, int *l)
 153 {
 154         *l = 32 - pf->bitpos;
 155         *h = get_count_order(pf->mask) - *l;
 156 }
 157
 158 static void mtk_hw_write_cross_field(struct mtk_pinctrl *hw,
 159                                      struct mtk_pin_field *pf, int value)
 160 {
 161         int nbits_l, nbits_h;
 162
 163         mtk_hw_bits_part(pf, &nbits_h, &nbits_l);
 164
 165         mtk_rmw(hw, pf->index, pf->offset, pf->mask << pf->bitpos,
 166                 (value & pf->mask) << pf->bitpos);
 167
 168         mtk_rmw(hw, pf->index, pf->offset + pf->next, BIT(nbits_h) - 1,
 169                 (value & pf->mask) >> nbits_l);
 170 }
 171
 172 static void mtk_hw_read_cross_field(struct mtk_pinctrl *hw,
 173                                     struct mtk_pin_field *pf, int *value)
 174 {
 175         int nbits_l, nbits_h, h, l;
 176
 177         mtk_hw_bits_part(pf, &nbits_h, &nbits_l);
 178
 179         l  = (mtk_r32(hw, pf->index, pf->offset)
 180               >> pf->bitpos) & (BIT(nbits_l) - 1);
 181         h  = (mtk_r32(hw, pf->index, pf->offset + pf->next))
 182               & (BIT(nbits_h) - 1);
 183
 184         *value = (h << nbits_l) | l;
 185 }
 186
 187 int mtk_hw_set_value(struct mtk_pinctrl *hw, const struct mtk_pin_desc *desc,
 188                      int field, int value)
 189 {
 190         struct mtk_pin_field pf;
 191         int err;
 192
 193         err = mtk_hw_pin_field_get(hw, desc, field, &pf);
 194         if (err)
 195                 return err;
 196
 197         if (value < 0 || value > pf.mask)
 198                 return -EINVAL;
 199
 200         if (!pf.next)
 201                 mtk_rmw(hw, pf.index, pf.offset, pf.mask << pf.bitpos,
 202                         (value & pf.mask) << pf.bitpos);
 203         else
 204                 mtk_hw_write_cross_field(hw, &pf, value);
 205
 206         return 0;
 207 }
 208 EXPORT_SYMBOL_GPL(mtk_hw_set_value);
 209
 210 int mtk_hw_get_value(struct mtk_pinctrl *hw, const struct mtk_pin_desc *desc,
 211                      int field, int *value)
 212 {
 213         struct mtk_pin_field pf;
 214         int err;
 215
 216         err = mtk_hw_pin_field_get(hw, desc, field, &pf);
 217         if (err)
 218                 return err;
 219
 220         if (!pf.next)
 221                 *value = (mtk_r32(hw, pf.index, pf.offset)
 222                           >> pf.bitpos) & pf.mask;
 223         else
 224                 mtk_hw_read_cross_field(hw, &pf, value);
 225
 226         return 0;
 227 }
 228 EXPORT_SYMBOL_GPL(mtk_hw_get_value);
 229
 230 static int mtk_xt_find_eint_num(struct mtk_pinctrl *hw, unsigned long eint_n)
 231 {
 232         const struct mtk_pin_desc *desc;
 233         int i = 0;
 234
 235         desc = (const struct mtk_pin_desc *)hw->soc->pins;
 236
 237         while (i < hw->soc->npins) {
 238                 if (desc[i].eint.eint_n == eint_n)
 239                         return desc[i].number;
 240                 i++;
 241         }
 242
 243         return EINT_NA;
 244 }
 245
 246 /*
 247  * Virtual GPIO only used inside SOC and not being exported to outside SOC.
 248  * Some modules use virtual GPIO as eint (e.g. pmif or usb).
 249  * In MTK platform, external interrupt (EINT) and GPIO is 1-1 mapping
 250  * and we can set GPIO as eint.
 251  * But some modules use specific eint which doesn't have real GPIO pin.
 252  * So we use virtual GPIO to map it.
 253  */
 254
 255 bool mtk_is_virt_gpio(struct mtk_pinctrl *hw, unsigned int gpio_n)
 256 {
 257         const struct mtk_pin_desc *desc;
 258         bool virt_gpio = false;
 259
 260         desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio_n];
 261
 262         if (desc->funcs && !desc->funcs[desc->eint.eint_m].name)
 263                 virt_gpio = true;
 264
 265         return virt_gpio;
 266 }
 267 EXPORT_SYMBOL_GPL(mtk_is_virt_gpio);
 268
 269 static int mtk_xt_get_gpio_n(void *data, unsigned long eint_n,
 270                              unsigned int *gpio_n,
 271                              struct gpio_chip **gpio_chip)
 272 {
 273         struct mtk_pinctrl *hw = (struct mtk_pinctrl *)data;
 274         const struct mtk_pin_desc *desc;
 275
 276         desc = (const struct mtk_pin_desc *)hw->soc->pins;
 277         *gpio_chip = &hw->chip;
 278
 279         /* Be greedy to guess first gpio_n is equal to eint_n */
 280         if (desc[eint_n].eint.eint_n == eint_n)
 281                 *gpio_n = eint_n;
 282         else
 283                 *gpio_n = mtk_xt_find_eint_num(hw, eint_n);
 284
 285         return *gpio_n == EINT_NA ? -EINVAL : 0;
 286 }
 287
 288 static int mtk_xt_get_gpio_state(void *data, unsigned long eint_n)
 289 {
 290         struct mtk_pinctrl *hw = (struct mtk_pinctrl *)data;
 291         const struct mtk_pin_desc *desc;
 292         struct gpio_chip *gpio_chip;
 293         unsigned int gpio_n;
 294         int value, err;
 295
 296         err = mtk_xt_get_gpio_n(hw, eint_n, &gpio_n, &gpio_chip);
 297         if (err)
 298                 return err;
 299
 300         desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio_n];
 301
 302         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DI, &value);
 303         if (err)
 304                 return err;
 305
 306         return !!value;
 307 }
 308
 309 static int mtk_xt_set_gpio_as_eint(void *data, unsigned long eint_n)
 310 {
 311         struct mtk_pinctrl *hw = (struct mtk_pinctrl *)data;
 312         const struct mtk_pin_desc *desc;
 313         struct gpio_chip *gpio_chip;
 314         unsigned int gpio_n;
 315         int err;
 316
 317         err = mtk_xt_get_gpio_n(hw, eint_n, &gpio_n, &gpio_chip);
 318         if (err)
 319                 return err;
 320
 321         if (mtk_is_virt_gpio(hw, gpio_n))
 322                 return 0;
 323
 324         desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio_n];
 325
 326         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_MODE,
 327                                desc->eint.eint_m);
 328         if (err)
 329                 return err;
 330
 331         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, MTK_INPUT);
 332         if (err)
 333                 return err;
 334
 335         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT, MTK_ENABLE);
 336         /* SMT is supposed to be supported by every real GPIO and doesn't
 337          * support virtual GPIOs, so the extra condition err != -ENOTSUPP
 338          * is just for adding EINT support to these virtual GPIOs. It should
 339          * add an extra flag in the pin descriptor when more pins with
 340          * distinctive characteristic come out.
 341          */
 342         if (err && err != -ENOTSUPP)
 343                 return err;
 344
 345         return 0;
 346 }
 347
 348 static const struct mtk_eint_xt mtk_eint_xt = {
 349         .get_gpio_n = mtk_xt_get_gpio_n,
 350         .get_gpio_state = mtk_xt_get_gpio_state,
 351         .set_gpio_as_eint = mtk_xt_set_gpio_as_eint,
 352 };
 353
 354 int mtk_build_eint(struct mtk_pinctrl *hw, struct platform_device *pdev)
 355 {
 356         struct device_node *np = pdev->dev.of_node;
 357         struct resource *res;
 358
 359         if (!IS_ENABLED(CONFIG_EINT_MTK))
 360                 return 0;
 361
 362         if (!of_property_read_bool(np, "interrupt-controller"))
 363                 return -ENODEV;
 364
 365         hw->eint = devm_kzalloc(hw->dev, sizeof(*hw->eint), GFP_KERNEL);
 366         if (!hw->eint)
 367                 return -ENOMEM;
 368
 369         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "eint");
 370         if (!res) {
 371                 dev_err(&pdev->dev, "Unable to get eint resource\n");
 372                 return -ENODEV;
 373         }
 374
 375         hw->eint->base = devm_ioremap_resource(&pdev->dev, res);
 376         if (IS_ERR(hw->eint->base))
 377                 return PTR_ERR(hw->eint->base);
 378
 379         hw->eint->irq = irq_of_parse_and_map(np, 0);
 380         if (!hw->eint->irq)
 381                 return -EINVAL;
 382
 383         if (!hw->soc->eint_hw)
 384                 return -ENODEV;
 385
 386         hw->eint->dev = &pdev->dev;
 387         hw->eint->hw = hw->soc->eint_hw;
 388         hw->eint->pctl = hw;
 389         hw->eint->gpio_xlate = &mtk_eint_xt;
 390
 391         return mtk_eint_do_init(hw->eint);
 392 }
 393 EXPORT_SYMBOL_GPL(mtk_build_eint);
 394
 395 /* Revision 0 */
 396 int mtk_pinconf_bias_disable_set(struct mtk_pinctrl *hw,
 397                                  const struct mtk_pin_desc *desc)
 398 {
 399         int err;
 400
 401         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PU,
 402                                MTK_DISABLE);
 403         if (err)
 404                 return err;
 405
 406         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PD,
 407                                MTK_DISABLE);
 408         if (err)
 409                 return err;
 410
 411         return 0;
 412 }
 413 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_disable_set);
 414
 415 int mtk_pinconf_bias_disable_get(struct mtk_pinctrl *hw,
 416                                  const struct mtk_pin_desc *desc, int *res)
 417 {
 418         int v, v2;
 419         int err;
 420
 421         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PU, &v);
 422         if (err)
 423                 return err;
 424
 425         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PD, &v2);
 426         if (err)
 427                 return err;
 428
 429         if (v == MTK_ENABLE || v2 == MTK_ENABLE)
 430                 return -EINVAL;
 431
 432         *res = 1;
 433
 434         return 0;
 435 }
 436 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_disable_get);
 437
 438 int mtk_pinconf_bias_set(struct mtk_pinctrl *hw,
 439                          const struct mtk_pin_desc *desc, bool pullup)
 440 {
 441         int err, arg;
 442
 443         arg = pullup ? 1 : 2;
 444
 445         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PU, arg & 1);
 446         if (err)
 447                 return err;
 448
 449         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PD,
 450                                !!(arg & 2));
 451         if (err)
 452                 return err;
 453
 454         return 0;
 455 }
 456 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_set);
 457
 458 int mtk_pinconf_bias_get(struct mtk_pinctrl *hw,
 459                          const struct mtk_pin_desc *desc, bool pullup, int *res)
 460 {
 461         int reg, err, v;
 462
 463         reg = pullup ? PINCTRL_PIN_REG_PU : PINCTRL_PIN_REG_PD;
 464
 465         err = mtk_hw_get_value(hw, desc, reg, &v);
 466         if (err)
 467                 return err;
 468
 469         if (!v)
 470                 return -EINVAL;
 471
 472         *res = 1;
 473
 474         return 0;
 475 }
 476 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_get);
 477
 478 /* Revision 1 */
 479 int mtk_pinconf_bias_disable_set_rev1(struct mtk_pinctrl *hw,
 480                                       const struct mtk_pin_desc *desc)
 481 {
 482         int err;
 483
 484         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PULLEN,
 485                                MTK_DISABLE);
 486         if (err)
 487                 return err;
 488
 489         return 0;
 490 }
 491 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_disable_set_rev1);
 492
 493 int mtk_pinconf_bias_disable_get_rev1(struct mtk_pinctrl *hw,
 494                                       const struct mtk_pin_desc *desc, int *res)
 495 {
 496         int v, err;
 497
 498         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PULLEN, &v);
 499         if (err)
 500                 return err;
 501
 502         if (v == MTK_ENABLE)
 503                 return -EINVAL;
 504
 505         *res = 1;
 506
 507         return 0;
 508 }
 509 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_disable_get_rev1);
 510
 511 int mtk_pinconf_bias_set_rev1(struct mtk_pinctrl *hw,
 512                               const struct mtk_pin_desc *desc, bool pullup)
 513 {
 514         int err, arg;
 515
 516         arg = pullup ? MTK_PULLUP : MTK_PULLDOWN;
 517
 518         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PULLEN,
 519                                MTK_ENABLE);
 520         if (err)
 521                 return err;
 522
 523         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PULLSEL, arg);
 524         if (err)
 525                 return err;
 526
 527         return 0;
 528 }
 529 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_set_rev1);
 530
 531 int mtk_pinconf_bias_get_rev1(struct mtk_pinctrl *hw,
 532                               const struct mtk_pin_desc *desc, bool pullup,
 533                               int *res)
 534 {
 535         int err, v;
 536
 537         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PULLEN, &v);
 538         if (err)
 539                 return err;
 540
 541         if (v == MTK_DISABLE)
 542                 return -EINVAL;
 543
 544         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PULLSEL, &v);
 545         if (err)
 546                 return err;
 547
 548         if (pullup ^ (v == MTK_PULLUP))
 549                 return -EINVAL;
 550
 551         *res = 1;
 552
 553         return 0;
 554 }
 555 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_get_rev1);
 556
 557 /* Combo for the following pull register type:
 558  * 1. PU + PD
 559  * 2. PULLSEL + PULLEN
 560  * 3. PUPD + R0 + R1
 561  */
 562 static int mtk_pinconf_bias_set_pu_pd(struct mtk_pinctrl *hw,
 563                                 const struct mtk_pin_desc *desc,
 564                                 u32 pullup, u32 arg)
 565 {
 566         int err, pu, pd;
 567
 568         if (arg == MTK_DISABLE) {
 569                 pu = 0;
 570                 pd = 0;
 571         } else if ((arg == MTK_ENABLE) && pullup) {
 572                 pu = 1;
 573                 pd = 0;
 574         } else if ((arg == MTK_ENABLE) && !pullup) {
 575                 pu = 0;
 576                 pd = 1;
 577         } else {
 578                 err = -EINVAL;
 579                 goto out;
 580         }
 581
 582         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PU, pu);
 583         if (err)
 584                 goto out;
 585
 586         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PD, pd);
 587
 588 out:
 589         return err;
 590 }
 591
 592 static int mtk_pinconf_bias_set_pullsel_pullen(struct mtk_pinctrl *hw,
 593                                 const struct mtk_pin_desc *desc,
 594                                 u32 pullup, u32 arg)
 595 {
 596         int err, enable;
 597
 598         if (arg == MTK_DISABLE)
 599                 enable = 0;
 600         else if (arg == MTK_ENABLE)
 601                 enable = 1;
 602         else {
 603                 err = -EINVAL;
 604                 goto out;
 605         }
 606
 607         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PULLEN, enable);
 608         if (err)
 609                 goto out;
 610
 611         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PULLSEL, pullup);
 612
 613 out:
 614         return err;
 615 }
 616
 617 static int mtk_pinconf_bias_set_pupd_r1_r0(struct mtk_pinctrl *hw,
 618                                 const struct mtk_pin_desc *desc,
 619                                 u32 pullup, u32 arg)
 620 {
 621         int err, r0, r1;
 622
 623         if ((arg == MTK_DISABLE) || (arg == MTK_PUPD_SET_R1R0_00)) {
 624                 pullup = 0;
 625                 r0 = 0;
 626                 r1 = 0;
 627         } else if (arg == MTK_PUPD_SET_R1R0_01) {
 628                 r0 = 1;
 629                 r1 = 0;
 630         } else if (arg == MTK_PUPD_SET_R1R0_10) {
 631                 r0 = 0;
 632                 r1 = 1;
 633         } else if (arg == MTK_PUPD_SET_R1R0_11) {
 634                 r0 = 1;
 635                 r1 = 1;
 636         } else {
 637                 err = -EINVAL;
 638                 goto out;
 639         }
 640
 641         /* MTK HW PUPD bit: 1 for pull-down, 0 for pull-up */
 642         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PUPD, !pullup);
 643         if (err)
 644                 goto out;
 645
 646         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_R0, r0);
 647         if (err)
 648                 goto out;
 649
 650         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_R1, r1);
 651
 652 out:
 653         return err;
 654 }
 655
 656 static int mtk_pinconf_bias_get_pu_pd(struct mtk_pinctrl *hw,
 657                                 const struct mtk_pin_desc *desc,
 658                                 u32 *pullup, u32 *enable)
 659 {
 660         int err, pu, pd;
 661
 662         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PU, &pu);
 663         if (err)
 664                 goto out;
 665
 666         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PD, &pd);
 667         if (err)
 668                 goto out;
 669
 670         if (pu == 0 && pd == 0) {
 671                 *pullup = 0;
 672                 *enable = MTK_DISABLE;
 673         } else if (pu == 1 && pd == 0) {
 674                 *pullup = 1;
 675                 *enable = MTK_ENABLE;
 676         } else if (pu == 0 && pd == 1) {
 677                 *pullup = 0;
 678                 *enable = MTK_ENABLE;
 679         } else
 680                 err = -EINVAL;
 681
 682 out:
 683         return err;
 684 }
 685
 686 static int mtk_pinconf_bias_get_pullsel_pullen(struct mtk_pinctrl *hw,
 687                                 const struct mtk_pin_desc *desc,
 688                                 u32 *pullup, u32 *enable)
 689 {
 690         int err;
 691
 692         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PULLSEL, pullup);
 693         if (err)
 694                 goto out;
 695
 696         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PULLEN, enable);
 697
 698 out:
 699         return err;
 700 }
 701
 702 static int mtk_pinconf_bias_get_pupd_r1_r0(struct mtk_pinctrl *hw,
 703                                 const struct mtk_pin_desc *desc,
 704                                 u32 *pullup, u32 *enable)
 705 {
 706         int err, r0, r1;
 707
 708         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PUPD, pullup);
 709         if (err)
 710                 goto out;
 711         /* MTK HW PUPD bit: 1 for pull-down, 0 for pull-up */
 712         *pullup = !(*pullup);
 713
 714         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_R0, &r0);
 715         if (err)
 716                 goto out;
 717
 718         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_R1, &r1);
 719         if (err)
 720                 goto out;
 721
 722         if ((r1 == 0) && (r0 == 0))
 723                 *enable = MTK_PUPD_SET_R1R0_00;
 724         else if ((r1 == 0) && (r0 == 1))
 725                 *enable = MTK_PUPD_SET_R1R0_01;
 726         else if ((r1 == 1) && (r0 == 0))
 727                 *enable = MTK_PUPD_SET_R1R0_10;
 728         else if ((r1 == 1) && (r0 == 1))
 729                 *enable = MTK_PUPD_SET_R1R0_11;
 730         else
 731                 err = -EINVAL;
 732
 733 out:
 734         return err;
 735 }
 736
 737 int mtk_pinconf_bias_set_combo(struct mtk_pinctrl *hw,
 738                                 const struct mtk_pin_desc *desc,
 739                                 u32 pullup, u32 arg)
 740 {
 741         int err;
 742
 743         err = mtk_pinconf_bias_set_pu_pd(hw, desc, pullup, arg);
 744         if (!err)
 745                 goto out;
 746
 747         err = mtk_pinconf_bias_set_pullsel_pullen(hw, desc, pullup, arg);
 748         if (!err)
 749                 goto out;
 750
 751         err = mtk_pinconf_bias_set_pupd_r1_r0(hw, desc, pullup, arg);
 752
 753 out:
 754         return err;
 755 }
 756 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_set_combo);
 757
 758 int mtk_pinconf_bias_get_combo(struct mtk_pinctrl *hw,
 759                               const struct mtk_pin_desc *desc,
 760                               u32 *pullup, u32 *enable)
 761 {
 762         int err;
 763
 764         err = mtk_pinconf_bias_get_pu_pd(hw, desc, pullup, enable);
 765         if (!err)
 766                 goto out;
 767
 768         err = mtk_pinconf_bias_get_pullsel_pullen(hw, desc, pullup, enable);
 769         if (!err)
 770                 goto out;
 771
 772         err = mtk_pinconf_bias_get_pupd_r1_r0(hw, desc, pullup, enable);
 773
 774 out:
 775         return err;
 776 }
 777 EXPORT_SYMBOL_GPL(mtk_pinconf_bias_get_combo);
 778
 779 /* Revision 0 */
 780 int mtk_pinconf_drive_set(struct mtk_pinctrl *hw,
 781                           const struct mtk_pin_desc *desc, u32 arg)
 782 {
 783         const struct mtk_drive_desc *tb;
 784         int err = -ENOTSUPP;
 785
 786         tb = &mtk_drive[desc->drv_n];
 787         /* 4mA when (e8, e4) = (0, 0)
 788          * 8mA when (e8, e4) = (0, 1)
 789          * 12mA when (e8, e4) = (1, 0)
 790          * 16mA when (e8, e4) = (1, 1)
 791          */
 792         if ((arg >= tb->min && arg <= tb->max) && !(arg % tb->step)) {
 793                 arg = (arg / tb->step - 1) * tb->scal;
 794                 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_E4,
 795                                        arg & 0x1);
 796                 if (err)
 797                         return err;
 798
 799                 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_E8,
 800                                        (arg & 0x2) >> 1);
 801                 if (err)
 802                         return err;
 803         }
 804
 805         return err;
 806 }
 807 EXPORT_SYMBOL_GPL(mtk_pinconf_drive_set);
 808
 809 int mtk_pinconf_drive_get(struct mtk_pinctrl *hw,
 810                           const struct mtk_pin_desc *desc, int *val)
 811 {
 812         const struct mtk_drive_desc *tb;
 813         int err, val1, val2;
 814
 815         tb = &mtk_drive[desc->drv_n];
 816
 817         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_E4, &val1);
 818         if (err)
 819                 return err;
 820
 821         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_E8, &val2);
 822         if (err)
 823                 return err;
 824
 825         /* 4mA when (e8, e4) = (0, 0); 8mA when (e8, e4) = (0, 1)
 826          * 12mA when (e8, e4) = (1, 0); 16mA when (e8, e4) = (1, 1)
 827          */
 828         *val = (((val2 << 1) + val1) / tb->scal + 1) * tb->step;
 829
 830         return 0;
 831 }
 832 EXPORT_SYMBOL_GPL(mtk_pinconf_drive_get);
 833
 834 /* Revision 1 */
 835 int mtk_pinconf_drive_set_rev1(struct mtk_pinctrl *hw,
 836                                const struct mtk_pin_desc *desc, u32 arg)
 837 {
 838         const struct mtk_drive_desc *tb;
 839         int err = -ENOTSUPP;
 840
 841         tb = &mtk_drive[desc->drv_n];
 842
 843         if ((arg >= tb->min && arg <= tb->max) && !(arg % tb->step)) {
 844                 arg = (arg / tb->step - 1) * tb->scal;
 845
 846                 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DRV,
 847                                        arg);
 848                 if (err)
 849                         return err;
 850         }
 851
 852         return err;
 853 }
 854 EXPORT_SYMBOL_GPL(mtk_pinconf_drive_set_rev1);
 855
 856 int mtk_pinconf_drive_get_rev1(struct mtk_pinctrl *hw,
 857                                const struct mtk_pin_desc *desc, int *val)
 858 {
 859         const struct mtk_drive_desc *tb;
 860         int err, val1;
 861
 862         tb = &mtk_drive[desc->drv_n];
 863
 864         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DRV, &val1);
 865         if (err)
 866                 return err;
 867
 868         *val = ((val1 & 0x7) / tb->scal + 1) * tb->step;
 869
 870         return 0;
 871 }
 872 EXPORT_SYMBOL_GPL(mtk_pinconf_drive_get_rev1);
 873
 874 int mtk_pinconf_drive_set_raw(struct mtk_pinctrl *hw,
 875                                const struct mtk_pin_desc *desc, u32 arg)
 876 {
 877         return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DRV, arg);
 878 }
 879 EXPORT_SYMBOL_GPL(mtk_pinconf_drive_set_raw);
 880
 881 int mtk_pinconf_drive_get_raw(struct mtk_pinctrl *hw,
 882                                const struct mtk_pin_desc *desc, int *val)
 883 {
 884         return mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DRV, val);
 885 }
 886 EXPORT_SYMBOL_GPL(mtk_pinconf_drive_get_raw);
 887
 888 int mtk_pinconf_adv_pull_set(struct mtk_pinctrl *hw,
 889                              const struct mtk_pin_desc *desc, bool pullup,
 890                              u32 arg)
 891 {
 892         int err;
 893
 894         /* 10K off & 50K (75K) off, when (R0, R1) = (0, 0);
 895          * 10K off & 50K (75K) on, when (R0, R1) = (0, 1);
 896          * 10K on & 50K (75K) off, when (R0, R1) = (1, 0);
 897          * 10K on & 50K (75K) on, when (R0, R1) = (1, 1)
 898          */
 899         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_R0, arg & 1);
 900         if (err)
 901                 return 0;
 902
 903         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_R1,
 904                                !!(arg & 2));
 905         if (err)
 906                 return 0;
 907
 908         arg = pullup ? 0 : 1;
 909
 910         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PUPD, arg);
 911
 912         /* If PUPD register is not supported for that pin, let's fallback to
 913          * general bias control.
 914          */
 915         if (err == -ENOTSUPP) {
 916                 if (hw->soc->bias_set) {
 917                         err = hw->soc->bias_set(hw, desc, pullup);
 918                         if (err)
 919                                 return err;
 920                 } else {
 921                         return -ENOTSUPP;
 922                 }
 923         }
 924
 925         return err;
 926 }
 927 EXPORT_SYMBOL_GPL(mtk_pinconf_adv_pull_set);
 928
 929 int mtk_pinconf_adv_pull_get(struct mtk_pinctrl *hw,
 930                              const struct mtk_pin_desc *desc, bool pullup,
 931                              u32 *val)
 932 {
 933         u32 t, t2;
 934         int err;
 935
 936         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PUPD, &t);
 937
 938         /* If PUPD register is not supported for that pin, let's fallback to
 939          * general bias control.
 940          */
 941         if (err == -ENOTSUPP) {
 942                 if (hw->soc->bias_get) {
 943                         err = hw->soc->bias_get(hw, desc, pullup, val);
 944                         if (err)
 945                                 return err;
 946                 } else {
 947                         return -ENOTSUPP;
 948                 }
 949         } else {
 950                 /* t == 0 supposes PULLUP for the customized PULL setup */
 951                 if (err)
 952                         return err;
 953
 954                 if (pullup ^ !t)
 955                         return -EINVAL;
 956         }
 957
 958         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_R0, &t);
 959         if (err)
 960                 return err;
 961
 962         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_R1, &t2);
 963         if (err)
 964                 return err;
 965
 966         *val = (t | t2 << 1) & 0x7;
 967
 968         return 0;
 969 }
 970 EXPORT_SYMBOL_GPL(mtk_pinconf_adv_pull_get);
 971
 972 int mtk_pinconf_adv_drive_set(struct mtk_pinctrl *hw,
 973                               const struct mtk_pin_desc *desc, u32 arg)
 974 {
 975         int err;
 976         int en = arg & 1;
 977         int e0 = !!(arg & 2);
 978         int e1 = !!(arg & 4);
 979
 980         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DRV_EN, en);
 981         if (err)
 982                 return err;
 983
 984         if (!en)
 985                 return err;
 986
 987         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DRV_E0, e0);
 988         if (err)
 989                 return err;
 990
 991         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DRV_E1, e1);
 992         if (err)
 993                 return err;
 994
 995         return err;
 996 }
 997 EXPORT_SYMBOL_GPL(mtk_pinconf_adv_drive_set);
 998
 999 int mtk_pinconf_adv_drive_get(struct mtk_pinctrl *hw,
1000                               const struct mtk_pin_desc *desc, u32 *val)
1001 {
1002         u32 en, e0, e1;
1003         int err;
1004
1005         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DRV_EN, &en);
1006         if (err)
1007                 return err;
1008
1009         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DRV_E0, &e0);
1010         if (err)
1011                 return err;
1012
1013         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DRV_E1, &e1);
1014         if (err)
1015                 return err;
1016
1017         *val = (en | e0 << 1 | e1 << 2) & 0x7;
1018
1019         return 0;
1020 }
1021 EXPORT_SYMBOL_GPL(mtk_pinconf_adv_drive_get);
1022
1023 MODULE_LICENSE("GPL v2");
1024 MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
1025 MODULE_DESCRIPTION("Pin configuration library module for mediatek SoCs");