1 /* 2 * Copyright (c) 2013, The Linux Foundation. All rights reserved. 3 * 4 * This software is licensed under the terms of the GNU General Public 5 * License version 2, as published by the Free Software Foundation, and 6 * may be copied, distributed, and modified under those terms. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/bitops.h> 16 #include <linux/err.h> 17 #include <linux/bug.h> 18 #include <linux/export.h> 19 #include <linux/clk-provider.h> 20 #include <linux/delay.h> 21 #include <linux/regmap.h> 22 #include <linux/math64.h> 23 24 #include <asm/div64.h> 25 26 #include "clk-rcg.h" 27 #include "common.h" 28 29 #define CMD_REG 0x0 30 #define CMD_UPDATE BIT(0) 31 #define CMD_ROOT_EN BIT(1) 32 #define CMD_DIRTY_CFG BIT(4) 33 #define CMD_DIRTY_N BIT(5) 34 #define CMD_DIRTY_M BIT(6) 35 #define CMD_DIRTY_D BIT(7) 36 #define CMD_ROOT_OFF BIT(31) 37 38 #define CFG_REG 0x4 39 #define CFG_SRC_DIV_SHIFT 0 40 #define CFG_SRC_SEL_SHIFT 8 41 #define CFG_SRC_SEL_MASK (0x7 << CFG_SRC_SEL_SHIFT) 42 #define CFG_MODE_SHIFT 12 43 #define CFG_MODE_MASK (0x3 << CFG_MODE_SHIFT) 44 #define CFG_MODE_DUAL_EDGE (0x2 << CFG_MODE_SHIFT) 45 46 #define M_REG 0x8 47 #define N_REG 0xc 48 #define D_REG 0x10 49 50 static int clk_rcg2_is_enabled(struct clk_hw *hw) 51 { 52 struct clk_rcg2 *rcg = to_clk_rcg2(hw); 53 u32 cmd; 54 int ret; 55 56 ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd); 57 if (ret) 58 return ret; 59 60 return (cmd & CMD_ROOT_OFF) == 0; 61 } 62 63 static u8 clk_rcg2_get_parent(struct clk_hw *hw) 64 { 65 struct clk_rcg2 *rcg = to_clk_rcg2(hw); 66 int num_parents = __clk_get_num_parents(hw->clk); 67 u32 cfg; 68 int i, ret; 69 70 ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg); 71 if (ret) 72 goto err; 73 74 cfg &= CFG_SRC_SEL_MASK; 75 cfg >>= CFG_SRC_SEL_SHIFT; 76 77 for (i = 0; i < num_parents; i++) 78 if (cfg == rcg->parent_map[i].cfg) 79 return i; 80 81 err: 82 pr_debug("%s: Clock %s has invalid parent, using default.\n", 83 __func__, __clk_get_name(hw->clk)); 84 return 0; 85 } 86 87 static int update_config(struct clk_rcg2 *rcg) 88 { 89 int count, ret; 90 u32 cmd; 91 struct clk_hw *hw = &rcg->clkr.hw; 92 const char *name = __clk_get_name(hw->clk); 93 94 ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, 95 CMD_UPDATE, CMD_UPDATE); 96 if (ret) 97 return ret; 98 99 /* Wait for update to take effect */ 100 for (count = 500; count > 0; count--) { 101 ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd); 102 if (ret) 103 return ret; 104 if (!(cmd & CMD_UPDATE)) 105 return 0; 106 udelay(1); 107 } 108 109 WARN(1, "%s: rcg didn't update its configuration.", name); 110 return 0; 111 } 112 113 static int clk_rcg2_set_parent(struct clk_hw *hw, u8 index) 114 { 115 struct clk_rcg2 *rcg = to_clk_rcg2(hw); 116 int ret; 117 u32 cfg = rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT; 118 119 ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, 120 CFG_SRC_SEL_MASK, cfg); 121 if (ret) 122 return ret; 123 124 return update_config(rcg); 125 } 126 127 /* 128 * Calculate m/n:d rate 129 * 130 * parent_rate m 131 * rate = ----------- x --- 132 * hid_div n 133 */ 134 static unsigned long 135 calc_rate(unsigned long rate, u32 m, u32 n, u32 mode, u32 hid_div) 136 { 137 if (hid_div) { 138 rate *= 2; 139 rate /= hid_div + 1; 140 } 141 142 if (mode) { 143 u64 tmp = rate; 144 tmp *= m; 145 do_div(tmp, n); 146 rate = tmp; 147 } 148 149 return rate; 150 } 151 152 static unsigned long 153 clk_rcg2_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) 154 { 155 struct clk_rcg2 *rcg = to_clk_rcg2(hw); 156 u32 cfg, hid_div, m = 0, n = 0, mode = 0, mask; 157 158 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg); 159 160 if (rcg->mnd_width) { 161 mask = BIT(rcg->mnd_width) - 1; 162 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + M_REG, &m); 163 m &= mask; 164 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + N_REG, &n); 165 n = ~n; 166 n &= mask; 167 n += m; 168 mode = cfg & CFG_MODE_MASK; 169 mode >>= CFG_MODE_SHIFT; 170 } 171 172 mask = BIT(rcg->hid_width) - 1; 173 hid_div = cfg >> CFG_SRC_DIV_SHIFT; 174 hid_div &= mask; 175 176 return calc_rate(parent_rate, m, n, mode, hid_div); 177 } 178 179 static long _freq_tbl_determine_rate(struct clk_hw *hw, 180 const struct freq_tbl *f, unsigned long rate, 181 unsigned long *p_rate, struct clk_hw **p_hw) 182 { 183 unsigned long clk_flags; 184 struct clk *p; 185 struct clk_rcg2 *rcg = to_clk_rcg2(hw); 186 int index; 187 188 f = qcom_find_freq(f, rate); 189 if (!f) 190 return -EINVAL; 191 192 index = qcom_find_src_index(hw, rcg->parent_map, f->src); 193 if (index < 0) 194 return index; 195 196 clk_flags = __clk_get_flags(hw->clk); 197 p = clk_get_parent_by_index(hw->clk, index); 198 if (clk_flags & CLK_SET_RATE_PARENT) { 199 if (f->pre_div) { 200 rate /= 2; 201 rate *= f->pre_div + 1; 202 } 203 204 if (f->n) { 205 u64 tmp = rate; 206 tmp = tmp * f->n; 207 do_div(tmp, f->m); 208 rate = tmp; 209 } 210 } else { 211 rate = __clk_get_rate(p); 212 } 213 *p_hw = __clk_get_hw(p); 214 *p_rate = rate; 215 216 return f->freq; 217 } 218 219 static long clk_rcg2_determine_rate(struct clk_hw *hw, unsigned long rate, 220 unsigned long min_rate, unsigned long max_rate, 221 unsigned long *p_rate, struct clk_hw **p) 222 { 223 struct clk_rcg2 *rcg = to_clk_rcg2(hw); 224 225 return _freq_tbl_determine_rate(hw, rcg->freq_tbl, rate, p_rate, p); 226 } 227 228 static int clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f) 229 { 230 u32 cfg, mask; 231 struct clk_hw *hw = &rcg->clkr.hw; 232 int ret, index = qcom_find_src_index(hw, rcg->parent_map, f->src); 233 234 if (index < 0) 235 return index; 236 237 if (rcg->mnd_width && f->n) { 238 mask = BIT(rcg->mnd_width) - 1; 239 ret = regmap_update_bits(rcg->clkr.regmap, 240 rcg->cmd_rcgr + M_REG, mask, f->m); 241 if (ret) 242 return ret; 243 244 ret = regmap_update_bits(rcg->clkr.regmap, 245 rcg->cmd_rcgr + N_REG, mask, ~(f->n - f->m)); 246 if (ret) 247 return ret; 248 249 ret = regmap_update_bits(rcg->clkr.regmap, 250 rcg->cmd_rcgr + D_REG, mask, ~f->n); 251 if (ret) 252 return ret; 253 } 254 255 mask = BIT(rcg->hid_width) - 1; 256 mask |= CFG_SRC_SEL_MASK | CFG_MODE_MASK; 257 cfg = f->pre_div << CFG_SRC_DIV_SHIFT; 258 cfg |= rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT; 259 if (rcg->mnd_width && f->n && (f->m != f->n)) 260 cfg |= CFG_MODE_DUAL_EDGE; 261 ret = regmap_update_bits(rcg->clkr.regmap, 262 rcg->cmd_rcgr + CFG_REG, mask, cfg); 263 if (ret) 264 return ret; 265 266 return update_config(rcg); 267 } 268 269 static int __clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate) 270 { 271 struct clk_rcg2 *rcg = to_clk_rcg2(hw); 272 const struct freq_tbl *f; 273 274 f = qcom_find_freq(rcg->freq_tbl, rate); 275 if (!f) 276 return -EINVAL; 277 278 return clk_rcg2_configure(rcg, f); 279 } 280 281 static int clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate, 282 unsigned long parent_rate) 283 { 284 return __clk_rcg2_set_rate(hw, rate); 285 } 286 287 static int clk_rcg2_set_rate_and_parent(struct clk_hw *hw, 288 unsigned long rate, unsigned long parent_rate, u8 index) 289 { 290 return __clk_rcg2_set_rate(hw, rate); 291 } 292 293 const struct clk_ops clk_rcg2_ops = { 294 .is_enabled = clk_rcg2_is_enabled, 295 .get_parent = clk_rcg2_get_parent, 296 .set_parent = clk_rcg2_set_parent, 297 .recalc_rate = clk_rcg2_recalc_rate, 298 .determine_rate = clk_rcg2_determine_rate, 299 .set_rate = clk_rcg2_set_rate, 300 .set_rate_and_parent = clk_rcg2_set_rate_and_parent, 301 }; 302 EXPORT_SYMBOL_GPL(clk_rcg2_ops); 303 304 struct frac_entry { 305 int num; 306 int den; 307 }; 308 309 static const struct frac_entry frac_table_675m[] = { /* link rate of 270M */ 310 { 52, 295 }, /* 119 M */ 311 { 11, 57 }, /* 130.25 M */ 312 { 63, 307 }, /* 138.50 M */ 313 { 11, 50 }, /* 148.50 M */ 314 { 47, 206 }, /* 154 M */ 315 { 31, 100 }, /* 205.25 M */ 316 { 107, 269 }, /* 268.50 M */ 317 { }, 318 }; 319 320 static struct frac_entry frac_table_810m[] = { /* Link rate of 162M */ 321 { 31, 211 }, /* 119 M */ 322 { 32, 199 }, /* 130.25 M */ 323 { 63, 307 }, /* 138.50 M */ 324 { 11, 60 }, /* 148.50 M */ 325 { 50, 263 }, /* 154 M */ 326 { 31, 120 }, /* 205.25 M */ 327 { 119, 359 }, /* 268.50 M */ 328 { }, 329 }; 330 331 static int clk_edp_pixel_set_rate(struct clk_hw *hw, unsigned long rate, 332 unsigned long parent_rate) 333 { 334 struct clk_rcg2 *rcg = to_clk_rcg2(hw); 335 struct freq_tbl f = *rcg->freq_tbl; 336 const struct frac_entry *frac; 337 int delta = 100000; 338 s64 src_rate = parent_rate; 339 s64 request; 340 u32 mask = BIT(rcg->hid_width) - 1; 341 u32 hid_div; 342 343 if (src_rate == 810000000) 344 frac = frac_table_810m; 345 else 346 frac = frac_table_675m; 347 348 for (; frac->num; frac++) { 349 request = rate; 350 request *= frac->den; 351 request = div_s64(request, frac->num); 352 if ((src_rate < (request - delta)) || 353 (src_rate > (request + delta))) 354 continue; 355 356 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, 357 &hid_div); 358 f.pre_div = hid_div; 359 f.pre_div >>= CFG_SRC_DIV_SHIFT; 360 f.pre_div &= mask; 361 f.m = frac->num; 362 f.n = frac->den; 363 364 return clk_rcg2_configure(rcg, &f); 365 } 366 367 return -EINVAL; 368 } 369 370 static int clk_edp_pixel_set_rate_and_parent(struct clk_hw *hw, 371 unsigned long rate, unsigned long parent_rate, u8 index) 372 { 373 /* Parent index is set statically in frequency table */ 374 return clk_edp_pixel_set_rate(hw, rate, parent_rate); 375 } 376 377 static long clk_edp_pixel_determine_rate(struct clk_hw *hw, unsigned long rate, 378 unsigned long min_rate, 379 unsigned long max_rate, 380 unsigned long *p_rate, struct clk_hw **p) 381 { 382 struct clk_rcg2 *rcg = to_clk_rcg2(hw); 383 const struct freq_tbl *f = rcg->freq_tbl; 384 const struct frac_entry *frac; 385 int delta = 100000; 386 s64 src_rate = *p_rate; 387 s64 request; 388 u32 mask = BIT(rcg->hid_width) - 1; 389 u32 hid_div; 390 int index = qcom_find_src_index(hw, rcg->parent_map, f->src); 391 392 /* Force the correct parent */ 393 *p = __clk_get_hw(clk_get_parent_by_index(hw->clk, index)); 394 395 if (src_rate == 810000000) 396 frac = frac_table_810m; 397 else 398 frac = frac_table_675m; 399 400 for (; frac->num; frac++) { 401 request = rate; 402 request *= frac->den; 403 request = div_s64(request, frac->num); 404 if ((src_rate < (request - delta)) || 405 (src_rate > (request + delta))) 406 continue; 407 408 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, 409 &hid_div); 410 hid_div >>= CFG_SRC_DIV_SHIFT; 411 hid_div &= mask; 412 413 return calc_rate(src_rate, frac->num, frac->den, !!frac->den, 414 hid_div); 415 } 416 417 return -EINVAL; 418 } 419 420 const struct clk_ops clk_edp_pixel_ops = { 421 .is_enabled = clk_rcg2_is_enabled, 422 .get_parent = clk_rcg2_get_parent, 423 .set_parent = clk_rcg2_set_parent, 424 .recalc_rate = clk_rcg2_recalc_rate, 425 .set_rate = clk_edp_pixel_set_rate, 426 .set_rate_and_parent = clk_edp_pixel_set_rate_and_parent, 427 .determine_rate = clk_edp_pixel_determine_rate, 428 }; 429 EXPORT_SYMBOL_GPL(clk_edp_pixel_ops); 430 431 static long clk_byte_determine_rate(struct clk_hw *hw, unsigned long rate, 432 unsigned long min_rate, unsigned long max_rate, 433 unsigned long *p_rate, struct clk_hw **p_hw) 434 { 435 struct clk_rcg2 *rcg = to_clk_rcg2(hw); 436 const struct freq_tbl *f = rcg->freq_tbl; 437 int index = qcom_find_src_index(hw, rcg->parent_map, f->src); 438 unsigned long parent_rate, div; 439 u32 mask = BIT(rcg->hid_width) - 1; 440 struct clk *p; 441 442 if (rate == 0) 443 return -EINVAL; 444 445 p = clk_get_parent_by_index(hw->clk, index); 446 *p_hw = __clk_get_hw(p); 447 *p_rate = parent_rate = __clk_round_rate(p, rate); 448 449 div = DIV_ROUND_UP((2 * parent_rate), rate) - 1; 450 div = min_t(u32, div, mask); 451 452 return calc_rate(parent_rate, 0, 0, 0, div); 453 } 454 455 static int clk_byte_set_rate(struct clk_hw *hw, unsigned long rate, 456 unsigned long parent_rate) 457 { 458 struct clk_rcg2 *rcg = to_clk_rcg2(hw); 459 struct freq_tbl f = *rcg->freq_tbl; 460 unsigned long div; 461 u32 mask = BIT(rcg->hid_width) - 1; 462 463 div = DIV_ROUND_UP((2 * parent_rate), rate) - 1; 464 div = min_t(u32, div, mask); 465 466 f.pre_div = div; 467 468 return clk_rcg2_configure(rcg, &f); 469 } 470 471 static int clk_byte_set_rate_and_parent(struct clk_hw *hw, 472 unsigned long rate, unsigned long parent_rate, u8 index) 473 { 474 /* Parent index is set statically in frequency table */ 475 return clk_byte_set_rate(hw, rate, parent_rate); 476 } 477 478 const struct clk_ops clk_byte_ops = { 479 .is_enabled = clk_rcg2_is_enabled, 480 .get_parent = clk_rcg2_get_parent, 481 .set_parent = clk_rcg2_set_parent, 482 .recalc_rate = clk_rcg2_recalc_rate, 483 .set_rate = clk_byte_set_rate, 484 .set_rate_and_parent = clk_byte_set_rate_and_parent, 485 .determine_rate = clk_byte_determine_rate, 486 }; 487 EXPORT_SYMBOL_GPL(clk_byte_ops); 488 489 static const struct frac_entry frac_table_pixel[] = { 490 { 3, 8 }, 491 { 2, 9 }, 492 { 4, 9 }, 493 { 1, 1 }, 494 { } 495 }; 496 497 static long clk_pixel_determine_rate(struct clk_hw *hw, unsigned long rate, 498 unsigned long min_rate, 499 unsigned long max_rate, 500 unsigned long *p_rate, struct clk_hw **p) 501 { 502 struct clk_rcg2 *rcg = to_clk_rcg2(hw); 503 unsigned long request, src_rate; 504 int delta = 100000; 505 const struct freq_tbl *f = rcg->freq_tbl; 506 const struct frac_entry *frac = frac_table_pixel; 507 int index = qcom_find_src_index(hw, rcg->parent_map, f->src); 508 struct clk *parent = clk_get_parent_by_index(hw->clk, index); 509 510 *p = __clk_get_hw(parent); 511 512 for (; frac->num; frac++) { 513 request = (rate * frac->den) / frac->num; 514 515 src_rate = __clk_round_rate(parent, request); 516 if ((src_rate < (request - delta)) || 517 (src_rate > (request + delta))) 518 continue; 519 520 *p_rate = src_rate; 521 return (src_rate * frac->num) / frac->den; 522 } 523 524 return -EINVAL; 525 } 526 527 static int clk_pixel_set_rate(struct clk_hw *hw, unsigned long rate, 528 unsigned long parent_rate) 529 { 530 struct clk_rcg2 *rcg = to_clk_rcg2(hw); 531 struct freq_tbl f = *rcg->freq_tbl; 532 const struct frac_entry *frac = frac_table_pixel; 533 unsigned long request; 534 int delta = 100000; 535 u32 mask = BIT(rcg->hid_width) - 1; 536 u32 hid_div; 537 538 for (; frac->num; frac++) { 539 request = (rate * frac->den) / frac->num; 540 541 if ((parent_rate < (request - delta)) || 542 (parent_rate > (request + delta))) 543 continue; 544 545 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, 546 &hid_div); 547 f.pre_div = hid_div; 548 f.pre_div >>= CFG_SRC_DIV_SHIFT; 549 f.pre_div &= mask; 550 f.m = frac->num; 551 f.n = frac->den; 552 553 return clk_rcg2_configure(rcg, &f); 554 } 555 return -EINVAL; 556 } 557 558 static int clk_pixel_set_rate_and_parent(struct clk_hw *hw, unsigned long rate, 559 unsigned long parent_rate, u8 index) 560 { 561 /* Parent index is set statically in frequency table */ 562 return clk_pixel_set_rate(hw, rate, parent_rate); 563 } 564 565 const struct clk_ops clk_pixel_ops = { 566 .is_enabled = clk_rcg2_is_enabled, 567 .get_parent = clk_rcg2_get_parent, 568 .set_parent = clk_rcg2_set_parent, 569 .recalc_rate = clk_rcg2_recalc_rate, 570 .set_rate = clk_pixel_set_rate, 571 .set_rate_and_parent = clk_pixel_set_rate_and_parent, 572 .determine_rate = clk_pixel_determine_rate, 573 }; 574 EXPORT_SYMBOL_GPL(clk_pixel_ops); 575