1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2013, The Linux Foundation. All rights reserved. 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/bitops.h> 8 #include <linux/err.h> 9 #include <linux/export.h> 10 #include <linux/clk-provider.h> 11 #include <linux/regmap.h> 12 13 #include <asm/div64.h> 14 15 #include "clk-rcg.h" 16 #include "common.h" 17 18 static u32 ns_to_src(struct src_sel *s, u32 ns) 19 { 20 ns >>= s->src_sel_shift; 21 ns &= SRC_SEL_MASK; 22 return ns; 23 } 24 25 static u32 src_to_ns(struct src_sel *s, u8 src, u32 ns) 26 { 27 u32 mask; 28 29 mask = SRC_SEL_MASK; 30 mask <<= s->src_sel_shift; 31 ns &= ~mask; 32 33 ns |= src << s->src_sel_shift; 34 return ns; 35 } 36 37 static u8 clk_rcg_get_parent(struct clk_hw *hw) 38 { 39 struct clk_rcg *rcg = to_clk_rcg(hw); 40 int num_parents = clk_hw_get_num_parents(hw); 41 u32 ns; 42 int i, ret; 43 44 ret = regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns); 45 if (ret) 46 goto err; 47 ns = ns_to_src(&rcg->s, ns); 48 for (i = 0; i < num_parents; i++) 49 if (ns == rcg->s.parent_map[i].cfg) 50 return i; 51 52 err: 53 pr_debug("%s: Clock %s has invalid parent, using default.\n", 54 __func__, clk_hw_get_name(hw)); 55 return 0; 56 } 57 58 static int reg_to_bank(struct clk_dyn_rcg *rcg, u32 bank) 59 { 60 bank &= BIT(rcg->mux_sel_bit); 61 return !!bank; 62 } 63 64 static u8 clk_dyn_rcg_get_parent(struct clk_hw *hw) 65 { 66 struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw); 67 int num_parents = clk_hw_get_num_parents(hw); 68 u32 ns, reg; 69 int bank; 70 int i, ret; 71 struct src_sel *s; 72 73 ret = regmap_read(rcg->clkr.regmap, rcg->bank_reg, ®); 74 if (ret) 75 goto err; 76 bank = reg_to_bank(rcg, reg); 77 s = &rcg->s[bank]; 78 79 ret = regmap_read(rcg->clkr.regmap, rcg->ns_reg[bank], &ns); 80 if (ret) 81 goto err; 82 ns = ns_to_src(s, ns); 83 84 for (i = 0; i < num_parents; i++) 85 if (ns == s->parent_map[i].cfg) 86 return i; 87 88 err: 89 pr_debug("%s: Clock %s has invalid parent, using default.\n", 90 __func__, clk_hw_get_name(hw)); 91 return 0; 92 } 93 94 static int clk_rcg_set_parent(struct clk_hw *hw, u8 index) 95 { 96 struct clk_rcg *rcg = to_clk_rcg(hw); 97 u32 ns; 98 99 regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns); 100 ns = src_to_ns(&rcg->s, rcg->s.parent_map[index].cfg, ns); 101 regmap_write(rcg->clkr.regmap, rcg->ns_reg, ns); 102 103 return 0; 104 } 105 106 static u32 md_to_m(struct mn *mn, u32 md) 107 { 108 md >>= mn->m_val_shift; 109 md &= BIT(mn->width) - 1; 110 return md; 111 } 112 113 static u32 ns_to_pre_div(struct pre_div *p, u32 ns) 114 { 115 ns >>= p->pre_div_shift; 116 ns &= BIT(p->pre_div_width) - 1; 117 return ns; 118 } 119 120 static u32 pre_div_to_ns(struct pre_div *p, u8 pre_div, u32 ns) 121 { 122 u32 mask; 123 124 mask = BIT(p->pre_div_width) - 1; 125 mask <<= p->pre_div_shift; 126 ns &= ~mask; 127 128 ns |= pre_div << p->pre_div_shift; 129 return ns; 130 } 131 132 static u32 mn_to_md(struct mn *mn, u32 m, u32 n, u32 md) 133 { 134 u32 mask, mask_w; 135 136 mask_w = BIT(mn->width) - 1; 137 mask = (mask_w << mn->m_val_shift) | mask_w; 138 md &= ~mask; 139 140 if (n) { 141 m <<= mn->m_val_shift; 142 md |= m; 143 md |= ~n & mask_w; 144 } 145 146 return md; 147 } 148 149 static u32 ns_m_to_n(struct mn *mn, u32 ns, u32 m) 150 { 151 ns = ~ns >> mn->n_val_shift; 152 ns &= BIT(mn->width) - 1; 153 return ns + m; 154 } 155 156 static u32 reg_to_mnctr_mode(struct mn *mn, u32 val) 157 { 158 val >>= mn->mnctr_mode_shift; 159 val &= MNCTR_MODE_MASK; 160 return val; 161 } 162 163 static u32 mn_to_ns(struct mn *mn, u32 m, u32 n, u32 ns) 164 { 165 u32 mask; 166 167 mask = BIT(mn->width) - 1; 168 mask <<= mn->n_val_shift; 169 ns &= ~mask; 170 171 if (n) { 172 n = n - m; 173 n = ~n; 174 n &= BIT(mn->width) - 1; 175 n <<= mn->n_val_shift; 176 ns |= n; 177 } 178 179 return ns; 180 } 181 182 static u32 mn_to_reg(struct mn *mn, u32 m, u32 n, u32 val) 183 { 184 u32 mask; 185 186 mask = MNCTR_MODE_MASK << mn->mnctr_mode_shift; 187 mask |= BIT(mn->mnctr_en_bit); 188 val &= ~mask; 189 190 if (n) { 191 val |= BIT(mn->mnctr_en_bit); 192 val |= MNCTR_MODE_DUAL << mn->mnctr_mode_shift; 193 } 194 195 return val; 196 } 197 198 static int configure_bank(struct clk_dyn_rcg *rcg, const struct freq_tbl *f) 199 { 200 u32 ns, md, reg; 201 int bank, new_bank, ret, index; 202 struct mn *mn; 203 struct pre_div *p; 204 struct src_sel *s; 205 bool enabled; 206 u32 md_reg, ns_reg; 207 bool banked_mn = !!rcg->mn[1].width; 208 bool banked_p = !!rcg->p[1].pre_div_width; 209 struct clk_hw *hw = &rcg->clkr.hw; 210 211 enabled = __clk_is_enabled(hw->clk); 212 213 ret = regmap_read(rcg->clkr.regmap, rcg->bank_reg, ®); 214 if (ret) 215 return ret; 216 bank = reg_to_bank(rcg, reg); 217 new_bank = enabled ? !bank : bank; 218 219 ns_reg = rcg->ns_reg[new_bank]; 220 ret = regmap_read(rcg->clkr.regmap, ns_reg, &ns); 221 if (ret) 222 return ret; 223 224 if (banked_mn) { 225 mn = &rcg->mn[new_bank]; 226 md_reg = rcg->md_reg[new_bank]; 227 228 ns |= BIT(mn->mnctr_reset_bit); 229 ret = regmap_write(rcg->clkr.regmap, ns_reg, ns); 230 if (ret) 231 return ret; 232 233 ret = regmap_read(rcg->clkr.regmap, md_reg, &md); 234 if (ret) 235 return ret; 236 md = mn_to_md(mn, f->m, f->n, md); 237 ret = regmap_write(rcg->clkr.regmap, md_reg, md); 238 if (ret) 239 return ret; 240 ns = mn_to_ns(mn, f->m, f->n, ns); 241 ret = regmap_write(rcg->clkr.regmap, ns_reg, ns); 242 if (ret) 243 return ret; 244 245 /* Two NS registers means mode control is in NS register */ 246 if (rcg->ns_reg[0] != rcg->ns_reg[1]) { 247 ns = mn_to_reg(mn, f->m, f->n, ns); 248 ret = regmap_write(rcg->clkr.regmap, ns_reg, ns); 249 if (ret) 250 return ret; 251 } else { 252 reg = mn_to_reg(mn, f->m, f->n, reg); 253 ret = regmap_write(rcg->clkr.regmap, rcg->bank_reg, 254 reg); 255 if (ret) 256 return ret; 257 } 258 259 ns &= ~BIT(mn->mnctr_reset_bit); 260 ret = regmap_write(rcg->clkr.regmap, ns_reg, ns); 261 if (ret) 262 return ret; 263 } 264 265 if (banked_p) { 266 p = &rcg->p[new_bank]; 267 ns = pre_div_to_ns(p, f->pre_div - 1, ns); 268 } 269 270 s = &rcg->s[new_bank]; 271 index = qcom_find_src_index(hw, s->parent_map, f->src); 272 if (index < 0) 273 return index; 274 ns = src_to_ns(s, s->parent_map[index].cfg, ns); 275 ret = regmap_write(rcg->clkr.regmap, ns_reg, ns); 276 if (ret) 277 return ret; 278 279 if (enabled) { 280 ret = regmap_read(rcg->clkr.regmap, rcg->bank_reg, ®); 281 if (ret) 282 return ret; 283 reg ^= BIT(rcg->mux_sel_bit); 284 ret = regmap_write(rcg->clkr.regmap, rcg->bank_reg, reg); 285 if (ret) 286 return ret; 287 } 288 return 0; 289 } 290 291 static int clk_dyn_rcg_set_parent(struct clk_hw *hw, u8 index) 292 { 293 struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw); 294 u32 ns, md, reg; 295 int bank; 296 struct freq_tbl f = { 0 }; 297 bool banked_mn = !!rcg->mn[1].width; 298 bool banked_p = !!rcg->p[1].pre_div_width; 299 300 regmap_read(rcg->clkr.regmap, rcg->bank_reg, ®); 301 bank = reg_to_bank(rcg, reg); 302 303 regmap_read(rcg->clkr.regmap, rcg->ns_reg[bank], &ns); 304 305 if (banked_mn) { 306 regmap_read(rcg->clkr.regmap, rcg->md_reg[bank], &md); 307 f.m = md_to_m(&rcg->mn[bank], md); 308 f.n = ns_m_to_n(&rcg->mn[bank], ns, f.m); 309 } 310 311 if (banked_p) 312 f.pre_div = ns_to_pre_div(&rcg->p[bank], ns) + 1; 313 314 f.src = qcom_find_src_index(hw, rcg->s[bank].parent_map, index); 315 return configure_bank(rcg, &f); 316 } 317 318 /* 319 * Calculate m/n:d rate 320 * 321 * parent_rate m 322 * rate = ----------- x --- 323 * pre_div n 324 */ 325 static unsigned long 326 calc_rate(unsigned long rate, u32 m, u32 n, u32 mode, u32 pre_div) 327 { 328 if (pre_div) 329 rate /= pre_div + 1; 330 331 if (mode) { 332 u64 tmp = rate; 333 tmp *= m; 334 do_div(tmp, n); 335 rate = tmp; 336 } 337 338 return rate; 339 } 340 341 static unsigned long 342 clk_rcg_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) 343 { 344 struct clk_rcg *rcg = to_clk_rcg(hw); 345 u32 pre_div, m = 0, n = 0, ns, md, mode = 0; 346 struct mn *mn = &rcg->mn; 347 348 regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns); 349 pre_div = ns_to_pre_div(&rcg->p, ns); 350 351 if (rcg->mn.width) { 352 regmap_read(rcg->clkr.regmap, rcg->md_reg, &md); 353 m = md_to_m(mn, md); 354 n = ns_m_to_n(mn, ns, m); 355 /* MN counter mode is in hw.enable_reg sometimes */ 356 if (rcg->clkr.enable_reg != rcg->ns_reg) 357 regmap_read(rcg->clkr.regmap, rcg->clkr.enable_reg, &mode); 358 else 359 mode = ns; 360 mode = reg_to_mnctr_mode(mn, mode); 361 } 362 363 return calc_rate(parent_rate, m, n, mode, pre_div); 364 } 365 366 static unsigned long 367 clk_dyn_rcg_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) 368 { 369 struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw); 370 u32 m, n, pre_div, ns, md, mode, reg; 371 int bank; 372 struct mn *mn; 373 bool banked_p = !!rcg->p[1].pre_div_width; 374 bool banked_mn = !!rcg->mn[1].width; 375 376 regmap_read(rcg->clkr.regmap, rcg->bank_reg, ®); 377 bank = reg_to_bank(rcg, reg); 378 379 regmap_read(rcg->clkr.regmap, rcg->ns_reg[bank], &ns); 380 m = n = pre_div = mode = 0; 381 382 if (banked_mn) { 383 mn = &rcg->mn[bank]; 384 regmap_read(rcg->clkr.regmap, rcg->md_reg[bank], &md); 385 m = md_to_m(mn, md); 386 n = ns_m_to_n(mn, ns, m); 387 /* Two NS registers means mode control is in NS register */ 388 if (rcg->ns_reg[0] != rcg->ns_reg[1]) 389 reg = ns; 390 mode = reg_to_mnctr_mode(mn, reg); 391 } 392 393 if (banked_p) 394 pre_div = ns_to_pre_div(&rcg->p[bank], ns); 395 396 return calc_rate(parent_rate, m, n, mode, pre_div); 397 } 398 399 static int _freq_tbl_determine_rate(struct clk_hw *hw, const struct freq_tbl *f, 400 struct clk_rate_request *req, 401 const struct parent_map *parent_map) 402 { 403 unsigned long clk_flags, rate = req->rate; 404 struct clk_hw *p; 405 int index; 406 407 f = qcom_find_freq(f, rate); 408 if (!f) 409 return -EINVAL; 410 411 index = qcom_find_src_index(hw, parent_map, f->src); 412 if (index < 0) 413 return index; 414 415 clk_flags = clk_hw_get_flags(hw); 416 p = clk_hw_get_parent_by_index(hw, index); 417 if (clk_flags & CLK_SET_RATE_PARENT) { 418 rate = rate * f->pre_div; 419 if (f->n) { 420 u64 tmp = rate; 421 tmp = tmp * f->n; 422 do_div(tmp, f->m); 423 rate = tmp; 424 } 425 } else { 426 rate = clk_hw_get_rate(p); 427 } 428 req->best_parent_hw = p; 429 req->best_parent_rate = rate; 430 req->rate = f->freq; 431 432 return 0; 433 } 434 435 static int clk_rcg_determine_rate(struct clk_hw *hw, 436 struct clk_rate_request *req) 437 { 438 struct clk_rcg *rcg = to_clk_rcg(hw); 439 440 return _freq_tbl_determine_rate(hw, rcg->freq_tbl, req, 441 rcg->s.parent_map); 442 } 443 444 static int clk_dyn_rcg_determine_rate(struct clk_hw *hw, 445 struct clk_rate_request *req) 446 { 447 struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw); 448 u32 reg; 449 int bank; 450 struct src_sel *s; 451 452 regmap_read(rcg->clkr.regmap, rcg->bank_reg, ®); 453 bank = reg_to_bank(rcg, reg); 454 s = &rcg->s[bank]; 455 456 return _freq_tbl_determine_rate(hw, rcg->freq_tbl, req, s->parent_map); 457 } 458 459 static int clk_rcg_bypass_determine_rate(struct clk_hw *hw, 460 struct clk_rate_request *req) 461 { 462 struct clk_rcg *rcg = to_clk_rcg(hw); 463 const struct freq_tbl *f = rcg->freq_tbl; 464 struct clk_hw *p; 465 int index = qcom_find_src_index(hw, rcg->s.parent_map, f->src); 466 467 req->best_parent_hw = p = clk_hw_get_parent_by_index(hw, index); 468 req->best_parent_rate = clk_hw_round_rate(p, req->rate); 469 req->rate = req->best_parent_rate; 470 471 return 0; 472 } 473 474 static int __clk_rcg_set_rate(struct clk_rcg *rcg, const struct freq_tbl *f) 475 { 476 u32 ns, md, ctl; 477 struct mn *mn = &rcg->mn; 478 u32 mask = 0; 479 unsigned int reset_reg; 480 481 if (rcg->mn.reset_in_cc) 482 reset_reg = rcg->clkr.enable_reg; 483 else 484 reset_reg = rcg->ns_reg; 485 486 if (rcg->mn.width) { 487 mask = BIT(mn->mnctr_reset_bit); 488 regmap_update_bits(rcg->clkr.regmap, reset_reg, mask, mask); 489 490 regmap_read(rcg->clkr.regmap, rcg->md_reg, &md); 491 md = mn_to_md(mn, f->m, f->n, md); 492 regmap_write(rcg->clkr.regmap, rcg->md_reg, md); 493 494 regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns); 495 /* MN counter mode is in hw.enable_reg sometimes */ 496 if (rcg->clkr.enable_reg != rcg->ns_reg) { 497 regmap_read(rcg->clkr.regmap, rcg->clkr.enable_reg, &ctl); 498 ctl = mn_to_reg(mn, f->m, f->n, ctl); 499 regmap_write(rcg->clkr.regmap, rcg->clkr.enable_reg, ctl); 500 } else { 501 ns = mn_to_reg(mn, f->m, f->n, ns); 502 } 503 ns = mn_to_ns(mn, f->m, f->n, ns); 504 } else { 505 regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns); 506 } 507 508 ns = pre_div_to_ns(&rcg->p, f->pre_div - 1, ns); 509 regmap_write(rcg->clkr.regmap, rcg->ns_reg, ns); 510 511 regmap_update_bits(rcg->clkr.regmap, reset_reg, mask, 0); 512 513 return 0; 514 } 515 516 static int clk_rcg_set_rate(struct clk_hw *hw, unsigned long rate, 517 unsigned long parent_rate) 518 { 519 struct clk_rcg *rcg = to_clk_rcg(hw); 520 const struct freq_tbl *f; 521 522 f = qcom_find_freq(rcg->freq_tbl, rate); 523 if (!f) 524 return -EINVAL; 525 526 return __clk_rcg_set_rate(rcg, f); 527 } 528 529 static int clk_rcg_set_floor_rate(struct clk_hw *hw, unsigned long rate, 530 unsigned long parent_rate) 531 { 532 struct clk_rcg *rcg = to_clk_rcg(hw); 533 const struct freq_tbl *f; 534 535 f = qcom_find_freq_floor(rcg->freq_tbl, rate); 536 if (!f) 537 return -EINVAL; 538 539 return __clk_rcg_set_rate(rcg, f); 540 } 541 542 static int clk_rcg_bypass_set_rate(struct clk_hw *hw, unsigned long rate, 543 unsigned long parent_rate) 544 { 545 struct clk_rcg *rcg = to_clk_rcg(hw); 546 547 return __clk_rcg_set_rate(rcg, rcg->freq_tbl); 548 } 549 550 static int clk_rcg_bypass2_determine_rate(struct clk_hw *hw, 551 struct clk_rate_request *req) 552 { 553 struct clk_hw *p; 554 555 p = req->best_parent_hw; 556 req->best_parent_rate = clk_hw_round_rate(p, req->rate); 557 req->rate = req->best_parent_rate; 558 559 return 0; 560 } 561 562 static int clk_rcg_bypass2_set_rate(struct clk_hw *hw, unsigned long rate, 563 unsigned long parent_rate) 564 { 565 struct clk_rcg *rcg = to_clk_rcg(hw); 566 struct freq_tbl f = { 0 }; 567 u32 ns, src; 568 int i, ret, num_parents = clk_hw_get_num_parents(hw); 569 570 ret = regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns); 571 if (ret) 572 return ret; 573 574 src = ns_to_src(&rcg->s, ns); 575 f.pre_div = ns_to_pre_div(&rcg->p, ns) + 1; 576 577 for (i = 0; i < num_parents; i++) { 578 if (src == rcg->s.parent_map[i].cfg) { 579 f.src = rcg->s.parent_map[i].src; 580 return __clk_rcg_set_rate(rcg, &f); 581 } 582 } 583 584 return -EINVAL; 585 } 586 587 static int clk_rcg_bypass2_set_rate_and_parent(struct clk_hw *hw, 588 unsigned long rate, unsigned long parent_rate, u8 index) 589 { 590 /* Read the hardware to determine parent during set_rate */ 591 return clk_rcg_bypass2_set_rate(hw, rate, parent_rate); 592 } 593 594 struct frac_entry { 595 int num; 596 int den; 597 }; 598 599 static const struct frac_entry pixel_table[] = { 600 { 1, 2 }, 601 { 1, 3 }, 602 { 3, 16 }, 603 { } 604 }; 605 606 static int clk_rcg_pixel_determine_rate(struct clk_hw *hw, 607 struct clk_rate_request *req) 608 { 609 int delta = 100000; 610 const struct frac_entry *frac = pixel_table; 611 unsigned long request, src_rate; 612 613 for (; frac->num; frac++) { 614 request = (req->rate * frac->den) / frac->num; 615 616 src_rate = clk_hw_round_rate(req->best_parent_hw, request); 617 618 if ((src_rate < (request - delta)) || 619 (src_rate > (request + delta))) 620 continue; 621 622 req->best_parent_rate = src_rate; 623 req->rate = (src_rate * frac->num) / frac->den; 624 return 0; 625 } 626 627 return -EINVAL; 628 } 629 630 static int clk_rcg_pixel_set_rate(struct clk_hw *hw, unsigned long rate, 631 unsigned long parent_rate) 632 { 633 struct clk_rcg *rcg = to_clk_rcg(hw); 634 int delta = 100000; 635 const struct frac_entry *frac = pixel_table; 636 unsigned long request; 637 struct freq_tbl f = { 0 }; 638 u32 ns, src; 639 int i, ret, num_parents = clk_hw_get_num_parents(hw); 640 641 ret = regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns); 642 if (ret) 643 return ret; 644 645 src = ns_to_src(&rcg->s, ns); 646 647 for (i = 0; i < num_parents; i++) { 648 if (src == rcg->s.parent_map[i].cfg) { 649 f.src = rcg->s.parent_map[i].src; 650 break; 651 } 652 } 653 654 /* bypass the pre divider */ 655 f.pre_div = 1; 656 657 /* let us find appropriate m/n values for this */ 658 for (; frac->num; frac++) { 659 request = (rate * frac->den) / frac->num; 660 661 if ((parent_rate < (request - delta)) || 662 (parent_rate > (request + delta))) 663 continue; 664 665 f.m = frac->num; 666 f.n = frac->den; 667 668 return __clk_rcg_set_rate(rcg, &f); 669 } 670 671 return -EINVAL; 672 } 673 674 static int clk_rcg_pixel_set_rate_and_parent(struct clk_hw *hw, 675 unsigned long rate, unsigned long parent_rate, u8 index) 676 { 677 return clk_rcg_pixel_set_rate(hw, rate, parent_rate); 678 } 679 680 static int clk_rcg_esc_determine_rate(struct clk_hw *hw, 681 struct clk_rate_request *req) 682 { 683 struct clk_rcg *rcg = to_clk_rcg(hw); 684 int pre_div_max = BIT(rcg->p.pre_div_width); 685 int div; 686 unsigned long src_rate; 687 688 if (req->rate == 0) 689 return -EINVAL; 690 691 src_rate = clk_hw_get_rate(req->best_parent_hw); 692 693 div = src_rate / req->rate; 694 695 if (div >= 1 && div <= pre_div_max) { 696 req->best_parent_rate = src_rate; 697 req->rate = src_rate / div; 698 return 0; 699 } 700 701 return -EINVAL; 702 } 703 704 static int clk_rcg_esc_set_rate(struct clk_hw *hw, unsigned long rate, 705 unsigned long parent_rate) 706 { 707 struct clk_rcg *rcg = to_clk_rcg(hw); 708 struct freq_tbl f = { 0 }; 709 int pre_div_max = BIT(rcg->p.pre_div_width); 710 int div; 711 u32 ns; 712 int i, ret, num_parents = clk_hw_get_num_parents(hw); 713 714 if (rate == 0) 715 return -EINVAL; 716 717 ret = regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns); 718 if (ret) 719 return ret; 720 721 ns = ns_to_src(&rcg->s, ns); 722 723 for (i = 0; i < num_parents; i++) { 724 if (ns == rcg->s.parent_map[i].cfg) { 725 f.src = rcg->s.parent_map[i].src; 726 break; 727 } 728 } 729 730 div = parent_rate / rate; 731 732 if (div >= 1 && div <= pre_div_max) { 733 f.pre_div = div; 734 return __clk_rcg_set_rate(rcg, &f); 735 } 736 737 return -EINVAL; 738 } 739 740 static int clk_rcg_esc_set_rate_and_parent(struct clk_hw *hw, 741 unsigned long rate, unsigned long parent_rate, u8 index) 742 { 743 return clk_rcg_esc_set_rate(hw, rate, parent_rate); 744 } 745 746 /* 747 * This type of clock has a glitch-free mux that switches between the output of 748 * the M/N counter and an always on clock source (XO). When clk_set_rate() is 749 * called we need to make sure that we don't switch to the M/N counter if it 750 * isn't clocking because the mux will get stuck and the clock will stop 751 * outputting a clock. This can happen if the framework isn't aware that this 752 * clock is on and so clk_set_rate() doesn't turn on the new parent. To fix 753 * this we switch the mux in the enable/disable ops and reprogram the M/N 754 * counter in the set_rate op. We also make sure to switch away from the M/N 755 * counter in set_rate if software thinks the clock is off. 756 */ 757 static int clk_rcg_lcc_set_rate(struct clk_hw *hw, unsigned long rate, 758 unsigned long parent_rate) 759 { 760 struct clk_rcg *rcg = to_clk_rcg(hw); 761 const struct freq_tbl *f; 762 int ret; 763 u32 gfm = BIT(10); 764 765 f = qcom_find_freq(rcg->freq_tbl, rate); 766 if (!f) 767 return -EINVAL; 768 769 /* Switch to XO to avoid glitches */ 770 regmap_update_bits(rcg->clkr.regmap, rcg->ns_reg, gfm, 0); 771 ret = __clk_rcg_set_rate(rcg, f); 772 /* Switch back to M/N if it's clocking */ 773 if (__clk_is_enabled(hw->clk)) 774 regmap_update_bits(rcg->clkr.regmap, rcg->ns_reg, gfm, gfm); 775 776 return ret; 777 } 778 779 static int clk_rcg_lcc_enable(struct clk_hw *hw) 780 { 781 struct clk_rcg *rcg = to_clk_rcg(hw); 782 u32 gfm = BIT(10); 783 784 /* Use M/N */ 785 return regmap_update_bits(rcg->clkr.regmap, rcg->ns_reg, gfm, gfm); 786 } 787 788 static void clk_rcg_lcc_disable(struct clk_hw *hw) 789 { 790 struct clk_rcg *rcg = to_clk_rcg(hw); 791 u32 gfm = BIT(10); 792 793 /* Use XO */ 794 regmap_update_bits(rcg->clkr.regmap, rcg->ns_reg, gfm, 0); 795 } 796 797 static int __clk_dyn_rcg_set_rate(struct clk_hw *hw, unsigned long rate) 798 { 799 struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw); 800 const struct freq_tbl *f; 801 802 f = qcom_find_freq(rcg->freq_tbl, rate); 803 if (!f) 804 return -EINVAL; 805 806 return configure_bank(rcg, f); 807 } 808 809 static int clk_dyn_rcg_set_rate(struct clk_hw *hw, unsigned long rate, 810 unsigned long parent_rate) 811 { 812 return __clk_dyn_rcg_set_rate(hw, rate); 813 } 814 815 static int clk_dyn_rcg_set_rate_and_parent(struct clk_hw *hw, 816 unsigned long rate, unsigned long parent_rate, u8 index) 817 { 818 return __clk_dyn_rcg_set_rate(hw, rate); 819 } 820 821 const struct clk_ops clk_rcg_ops = { 822 .enable = clk_enable_regmap, 823 .disable = clk_disable_regmap, 824 .get_parent = clk_rcg_get_parent, 825 .set_parent = clk_rcg_set_parent, 826 .recalc_rate = clk_rcg_recalc_rate, 827 .determine_rate = clk_rcg_determine_rate, 828 .set_rate = clk_rcg_set_rate, 829 }; 830 EXPORT_SYMBOL_GPL(clk_rcg_ops); 831 832 const struct clk_ops clk_rcg_floor_ops = { 833 .enable = clk_enable_regmap, 834 .disable = clk_disable_regmap, 835 .get_parent = clk_rcg_get_parent, 836 .set_parent = clk_rcg_set_parent, 837 .recalc_rate = clk_rcg_recalc_rate, 838 .determine_rate = clk_rcg_determine_rate, 839 .set_rate = clk_rcg_set_floor_rate, 840 }; 841 EXPORT_SYMBOL_GPL(clk_rcg_floor_ops); 842 843 const struct clk_ops clk_rcg_bypass_ops = { 844 .enable = clk_enable_regmap, 845 .disable = clk_disable_regmap, 846 .get_parent = clk_rcg_get_parent, 847 .set_parent = clk_rcg_set_parent, 848 .recalc_rate = clk_rcg_recalc_rate, 849 .determine_rate = clk_rcg_bypass_determine_rate, 850 .set_rate = clk_rcg_bypass_set_rate, 851 }; 852 EXPORT_SYMBOL_GPL(clk_rcg_bypass_ops); 853 854 const struct clk_ops clk_rcg_bypass2_ops = { 855 .enable = clk_enable_regmap, 856 .disable = clk_disable_regmap, 857 .get_parent = clk_rcg_get_parent, 858 .set_parent = clk_rcg_set_parent, 859 .recalc_rate = clk_rcg_recalc_rate, 860 .determine_rate = clk_rcg_bypass2_determine_rate, 861 .set_rate = clk_rcg_bypass2_set_rate, 862 .set_rate_and_parent = clk_rcg_bypass2_set_rate_and_parent, 863 }; 864 EXPORT_SYMBOL_GPL(clk_rcg_bypass2_ops); 865 866 const struct clk_ops clk_rcg_pixel_ops = { 867 .enable = clk_enable_regmap, 868 .disable = clk_disable_regmap, 869 .get_parent = clk_rcg_get_parent, 870 .set_parent = clk_rcg_set_parent, 871 .recalc_rate = clk_rcg_recalc_rate, 872 .determine_rate = clk_rcg_pixel_determine_rate, 873 .set_rate = clk_rcg_pixel_set_rate, 874 .set_rate_and_parent = clk_rcg_pixel_set_rate_and_parent, 875 }; 876 EXPORT_SYMBOL_GPL(clk_rcg_pixel_ops); 877 878 const struct clk_ops clk_rcg_esc_ops = { 879 .enable = clk_enable_regmap, 880 .disable = clk_disable_regmap, 881 .get_parent = clk_rcg_get_parent, 882 .set_parent = clk_rcg_set_parent, 883 .recalc_rate = clk_rcg_recalc_rate, 884 .determine_rate = clk_rcg_esc_determine_rate, 885 .set_rate = clk_rcg_esc_set_rate, 886 .set_rate_and_parent = clk_rcg_esc_set_rate_and_parent, 887 }; 888 EXPORT_SYMBOL_GPL(clk_rcg_esc_ops); 889 890 const struct clk_ops clk_rcg_lcc_ops = { 891 .enable = clk_rcg_lcc_enable, 892 .disable = clk_rcg_lcc_disable, 893 .get_parent = clk_rcg_get_parent, 894 .set_parent = clk_rcg_set_parent, 895 .recalc_rate = clk_rcg_recalc_rate, 896 .determine_rate = clk_rcg_determine_rate, 897 .set_rate = clk_rcg_lcc_set_rate, 898 }; 899 EXPORT_SYMBOL_GPL(clk_rcg_lcc_ops); 900 901 const struct clk_ops clk_dyn_rcg_ops = { 902 .enable = clk_enable_regmap, 903 .is_enabled = clk_is_enabled_regmap, 904 .disable = clk_disable_regmap, 905 .get_parent = clk_dyn_rcg_get_parent, 906 .set_parent = clk_dyn_rcg_set_parent, 907 .recalc_rate = clk_dyn_rcg_recalc_rate, 908 .determine_rate = clk_dyn_rcg_determine_rate, 909 .set_rate = clk_dyn_rcg_set_rate, 910 .set_rate_and_parent = clk_dyn_rcg_set_rate_and_parent, 911 }; 912 EXPORT_SYMBOL_GPL(clk_dyn_rcg_ops); 913