1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright 2013 Emilio López 4 * 5 * Emilio López <emilio@elopez.com.ar> 6 */ 7 8 #include <linux/clk.h> 9 #include <linux/clk-provider.h> 10 #include <linux/clkdev.h> 11 #include <linux/io.h> 12 #include <linux/of.h> 13 #include <linux/of_address.h> 14 #include <linux/reset-controller.h> 15 #include <linux/slab.h> 16 #include <linux/spinlock.h> 17 #include <linux/log2.h> 18 19 #include "clk-factors.h" 20 21 static DEFINE_SPINLOCK(clk_lock); 22 23 /* Maximum number of parents our clocks have */ 24 #define SUNXI_MAX_PARENTS 5 25 26 /** 27 * sun4i_get_pll1_factors() - calculates n, k, m, p factors for PLL1 28 * PLL1 rate is calculated as follows 29 * rate = (parent_rate * n * (k + 1) >> p) / (m + 1); 30 * parent_rate is always 24Mhz 31 */ 32 33 static void sun4i_get_pll1_factors(struct factors_request *req) 34 { 35 u8 div; 36 37 /* Normalize value to a 6M multiple */ 38 div = req->rate / 6000000; 39 req->rate = 6000000 * div; 40 41 /* m is always zero for pll1 */ 42 req->m = 0; 43 44 /* k is 1 only on these cases */ 45 if (req->rate >= 768000000 || req->rate == 42000000 || 46 req->rate == 54000000) 47 req->k = 1; 48 else 49 req->k = 0; 50 51 /* p will be 3 for divs under 10 */ 52 if (div < 10) 53 req->p = 3; 54 55 /* p will be 2 for divs between 10 - 20 and odd divs under 32 */ 56 else if (div < 20 || (div < 32 && (div & 1))) 57 req->p = 2; 58 59 /* p will be 1 for even divs under 32, divs under 40 and odd pairs 60 * of divs between 40-62 */ 61 else if (div < 40 || (div < 64 && (div & 2))) 62 req->p = 1; 63 64 /* any other entries have p = 0 */ 65 else 66 req->p = 0; 67 68 /* calculate a suitable n based on k and p */ 69 div <<= req->p; 70 div /= (req->k + 1); 71 req->n = div / 4; 72 } 73 74 /** 75 * sun6i_a31_get_pll1_factors() - calculates n, k and m factors for PLL1 76 * PLL1 rate is calculated as follows 77 * rate = parent_rate * (n + 1) * (k + 1) / (m + 1); 78 * parent_rate should always be 24MHz 79 */ 80 static void sun6i_a31_get_pll1_factors(struct factors_request *req) 81 { 82 /* 83 * We can operate only on MHz, this will make our life easier 84 * later. 85 */ 86 u32 freq_mhz = req->rate / 1000000; 87 u32 parent_freq_mhz = req->parent_rate / 1000000; 88 89 /* 90 * Round down the frequency to the closest multiple of either 91 * 6 or 16 92 */ 93 u32 round_freq_6 = round_down(freq_mhz, 6); 94 u32 round_freq_16 = round_down(freq_mhz, 16); 95 96 if (round_freq_6 > round_freq_16) 97 freq_mhz = round_freq_6; 98 else 99 freq_mhz = round_freq_16; 100 101 req->rate = freq_mhz * 1000000; 102 103 /* If the frequency is a multiple of 32 MHz, k is always 3 */ 104 if (!(freq_mhz % 32)) 105 req->k = 3; 106 /* If the frequency is a multiple of 9 MHz, k is always 2 */ 107 else if (!(freq_mhz % 9)) 108 req->k = 2; 109 /* If the frequency is a multiple of 8 MHz, k is always 1 */ 110 else if (!(freq_mhz % 8)) 111 req->k = 1; 112 /* Otherwise, we don't use the k factor */ 113 else 114 req->k = 0; 115 116 /* 117 * If the frequency is a multiple of 2 but not a multiple of 118 * 3, m is 3. This is the first time we use 6 here, yet we 119 * will use it on several other places. 120 * We use this number because it's the lowest frequency we can 121 * generate (with n = 0, k = 0, m = 3), so every other frequency 122 * somehow relates to this frequency. 123 */ 124 if ((freq_mhz % 6) == 2 || (freq_mhz % 6) == 4) 125 req->m = 2; 126 /* 127 * If the frequency is a multiple of 6MHz, but the factor is 128 * odd, m will be 3 129 */ 130 else if ((freq_mhz / 6) & 1) 131 req->m = 3; 132 /* Otherwise, we end up with m = 1 */ 133 else 134 req->m = 1; 135 136 /* Calculate n thanks to the above factors we already got */ 137 req->n = freq_mhz * (req->m + 1) / ((req->k + 1) * parent_freq_mhz) 138 - 1; 139 140 /* 141 * If n end up being outbound, and that we can still decrease 142 * m, do it. 143 */ 144 if ((req->n + 1) > 31 && (req->m + 1) > 1) { 145 req->n = (req->n + 1) / 2 - 1; 146 req->m = (req->m + 1) / 2 - 1; 147 } 148 } 149 150 /** 151 * sun8i_a23_get_pll1_factors() - calculates n, k, m, p factors for PLL1 152 * PLL1 rate is calculated as follows 153 * rate = (parent_rate * (n + 1) * (k + 1) >> p) / (m + 1); 154 * parent_rate is always 24Mhz 155 */ 156 157 static void sun8i_a23_get_pll1_factors(struct factors_request *req) 158 { 159 u8 div; 160 161 /* Normalize value to a 6M multiple */ 162 div = req->rate / 6000000; 163 req->rate = 6000000 * div; 164 165 /* m is always zero for pll1 */ 166 req->m = 0; 167 168 /* k is 1 only on these cases */ 169 if (req->rate >= 768000000 || req->rate == 42000000 || 170 req->rate == 54000000) 171 req->k = 1; 172 else 173 req->k = 0; 174 175 /* p will be 2 for divs under 20 and odd divs under 32 */ 176 if (div < 20 || (div < 32 && (div & 1))) 177 req->p = 2; 178 179 /* p will be 1 for even divs under 32, divs under 40 and odd pairs 180 * of divs between 40-62 */ 181 else if (div < 40 || (div < 64 && (div & 2))) 182 req->p = 1; 183 184 /* any other entries have p = 0 */ 185 else 186 req->p = 0; 187 188 /* calculate a suitable n based on k and p */ 189 div <<= req->p; 190 div /= (req->k + 1); 191 req->n = div / 4 - 1; 192 } 193 194 /** 195 * sun4i_get_pll5_factors() - calculates n, k factors for PLL5 196 * PLL5 rate is calculated as follows 197 * rate = parent_rate * n * (k + 1) 198 * parent_rate is always 24Mhz 199 */ 200 201 static void sun4i_get_pll5_factors(struct factors_request *req) 202 { 203 u8 div; 204 205 /* Normalize value to a parent_rate multiple (24M) */ 206 div = req->rate / req->parent_rate; 207 req->rate = req->parent_rate * div; 208 209 if (div < 31) 210 req->k = 0; 211 else if (div / 2 < 31) 212 req->k = 1; 213 else if (div / 3 < 31) 214 req->k = 2; 215 else 216 req->k = 3; 217 218 req->n = DIV_ROUND_UP(div, (req->k + 1)); 219 } 220 221 /** 222 * sun6i_a31_get_pll6_factors() - calculates n, k factors for A31 PLL6x2 223 * PLL6x2 rate is calculated as follows 224 * rate = parent_rate * (n + 1) * (k + 1) 225 * parent_rate is always 24Mhz 226 */ 227 228 static void sun6i_a31_get_pll6_factors(struct factors_request *req) 229 { 230 u8 div; 231 232 /* Normalize value to a parent_rate multiple (24M) */ 233 div = req->rate / req->parent_rate; 234 req->rate = req->parent_rate * div; 235 236 req->k = div / 32; 237 if (req->k > 3) 238 req->k = 3; 239 240 req->n = DIV_ROUND_UP(div, (req->k + 1)) - 1; 241 } 242 243 /** 244 * sun5i_a13_get_ahb_factors() - calculates m, p factors for AHB 245 * AHB rate is calculated as follows 246 * rate = parent_rate >> p 247 */ 248 249 static void sun5i_a13_get_ahb_factors(struct factors_request *req) 250 { 251 u32 div; 252 253 /* divide only */ 254 if (req->parent_rate < req->rate) 255 req->rate = req->parent_rate; 256 257 /* 258 * user manual says valid speed is 8k ~ 276M, but tests show it 259 * can work at speeds up to 300M, just after reparenting to pll6 260 */ 261 if (req->rate < 8000) 262 req->rate = 8000; 263 if (req->rate > 300000000) 264 req->rate = 300000000; 265 266 div = order_base_2(DIV_ROUND_UP(req->parent_rate, req->rate)); 267 268 /* p = 0 ~ 3 */ 269 if (div > 3) 270 div = 3; 271 272 req->rate = req->parent_rate >> div; 273 274 req->p = div; 275 } 276 277 #define SUN6I_AHB1_PARENT_PLL6 3 278 279 /** 280 * sun6i_a31_get_ahb_factors() - calculates m, p factors for AHB 281 * AHB rate is calculated as follows 282 * rate = parent_rate >> p 283 * 284 * if parent is pll6, then 285 * parent_rate = pll6 rate / (m + 1) 286 */ 287 288 static void sun6i_get_ahb1_factors(struct factors_request *req) 289 { 290 u8 div, calcp, calcm = 1; 291 292 /* 293 * clock can only divide, so we will never be able to achieve 294 * frequencies higher than the parent frequency 295 */ 296 if (req->parent_rate && req->rate > req->parent_rate) 297 req->rate = req->parent_rate; 298 299 div = DIV_ROUND_UP(req->parent_rate, req->rate); 300 301 /* calculate pre-divider if parent is pll6 */ 302 if (req->parent_index == SUN6I_AHB1_PARENT_PLL6) { 303 if (div < 4) 304 calcp = 0; 305 else if (div / 2 < 4) 306 calcp = 1; 307 else if (div / 4 < 4) 308 calcp = 2; 309 else 310 calcp = 3; 311 312 calcm = DIV_ROUND_UP(div, 1 << calcp); 313 } else { 314 calcp = __roundup_pow_of_two(div); 315 calcp = calcp > 3 ? 3 : calcp; 316 } 317 318 req->rate = (req->parent_rate / calcm) >> calcp; 319 req->p = calcp; 320 req->m = calcm - 1; 321 } 322 323 /** 324 * sun6i_ahb1_recalc() - calculates AHB clock rate from m, p factors and 325 * parent index 326 */ 327 static void sun6i_ahb1_recalc(struct factors_request *req) 328 { 329 req->rate = req->parent_rate; 330 331 /* apply pre-divider first if parent is pll6 */ 332 if (req->parent_index == SUN6I_AHB1_PARENT_PLL6) 333 req->rate /= req->m + 1; 334 335 /* clk divider */ 336 req->rate >>= req->p; 337 } 338 339 /** 340 * sun4i_get_apb1_factors() - calculates m, p factors for APB1 341 * APB1 rate is calculated as follows 342 * rate = (parent_rate >> p) / (m + 1); 343 */ 344 345 static void sun4i_get_apb1_factors(struct factors_request *req) 346 { 347 u8 calcm, calcp; 348 int div; 349 350 if (req->parent_rate < req->rate) 351 req->rate = req->parent_rate; 352 353 div = DIV_ROUND_UP(req->parent_rate, req->rate); 354 355 /* Invalid rate! */ 356 if (div > 32) 357 return; 358 359 if (div <= 4) 360 calcp = 0; 361 else if (div <= 8) 362 calcp = 1; 363 else if (div <= 16) 364 calcp = 2; 365 else 366 calcp = 3; 367 368 calcm = (div >> calcp) - 1; 369 370 req->rate = (req->parent_rate >> calcp) / (calcm + 1); 371 req->m = calcm; 372 req->p = calcp; 373 } 374 375 376 377 378 /** 379 * sun7i_a20_get_out_factors() - calculates m, p factors for CLK_OUT_A/B 380 * CLK_OUT rate is calculated as follows 381 * rate = (parent_rate >> p) / (m + 1); 382 */ 383 384 static void sun7i_a20_get_out_factors(struct factors_request *req) 385 { 386 u8 div, calcm, calcp; 387 388 /* These clocks can only divide, so we will never be able to achieve 389 * frequencies higher than the parent frequency */ 390 if (req->rate > req->parent_rate) 391 req->rate = req->parent_rate; 392 393 div = DIV_ROUND_UP(req->parent_rate, req->rate); 394 395 if (div < 32) 396 calcp = 0; 397 else if (div / 2 < 32) 398 calcp = 1; 399 else if (div / 4 < 32) 400 calcp = 2; 401 else 402 calcp = 3; 403 404 calcm = DIV_ROUND_UP(div, 1 << calcp); 405 406 req->rate = (req->parent_rate >> calcp) / calcm; 407 req->m = calcm - 1; 408 req->p = calcp; 409 } 410 411 /** 412 * sunxi_factors_clk_setup() - Setup function for factor clocks 413 */ 414 415 static const struct clk_factors_config sun4i_pll1_config = { 416 .nshift = 8, 417 .nwidth = 5, 418 .kshift = 4, 419 .kwidth = 2, 420 .mshift = 0, 421 .mwidth = 2, 422 .pshift = 16, 423 .pwidth = 2, 424 }; 425 426 static const struct clk_factors_config sun6i_a31_pll1_config = { 427 .nshift = 8, 428 .nwidth = 5, 429 .kshift = 4, 430 .kwidth = 2, 431 .mshift = 0, 432 .mwidth = 2, 433 .n_start = 1, 434 }; 435 436 static const struct clk_factors_config sun8i_a23_pll1_config = { 437 .nshift = 8, 438 .nwidth = 5, 439 .kshift = 4, 440 .kwidth = 2, 441 .mshift = 0, 442 .mwidth = 2, 443 .pshift = 16, 444 .pwidth = 2, 445 .n_start = 1, 446 }; 447 448 static const struct clk_factors_config sun4i_pll5_config = { 449 .nshift = 8, 450 .nwidth = 5, 451 .kshift = 4, 452 .kwidth = 2, 453 }; 454 455 static const struct clk_factors_config sun6i_a31_pll6_config = { 456 .nshift = 8, 457 .nwidth = 5, 458 .kshift = 4, 459 .kwidth = 2, 460 .n_start = 1, 461 }; 462 463 static const struct clk_factors_config sun5i_a13_ahb_config = { 464 .pshift = 4, 465 .pwidth = 2, 466 }; 467 468 static const struct clk_factors_config sun6i_ahb1_config = { 469 .mshift = 6, 470 .mwidth = 2, 471 .pshift = 4, 472 .pwidth = 2, 473 }; 474 475 static const struct clk_factors_config sun4i_apb1_config = { 476 .mshift = 0, 477 .mwidth = 5, 478 .pshift = 16, 479 .pwidth = 2, 480 }; 481 482 /* user manual says "n" but it's really "p" */ 483 static const struct clk_factors_config sun7i_a20_out_config = { 484 .mshift = 8, 485 .mwidth = 5, 486 .pshift = 20, 487 .pwidth = 2, 488 }; 489 490 static const struct factors_data sun4i_pll1_data __initconst = { 491 .enable = 31, 492 .table = &sun4i_pll1_config, 493 .getter = sun4i_get_pll1_factors, 494 }; 495 496 static const struct factors_data sun6i_a31_pll1_data __initconst = { 497 .enable = 31, 498 .table = &sun6i_a31_pll1_config, 499 .getter = sun6i_a31_get_pll1_factors, 500 }; 501 502 static const struct factors_data sun8i_a23_pll1_data __initconst = { 503 .enable = 31, 504 .table = &sun8i_a23_pll1_config, 505 .getter = sun8i_a23_get_pll1_factors, 506 }; 507 508 static const struct factors_data sun7i_a20_pll4_data __initconst = { 509 .enable = 31, 510 .table = &sun4i_pll5_config, 511 .getter = sun4i_get_pll5_factors, 512 }; 513 514 static const struct factors_data sun4i_pll5_data __initconst = { 515 .enable = 31, 516 .table = &sun4i_pll5_config, 517 .getter = sun4i_get_pll5_factors, 518 }; 519 520 static const struct factors_data sun6i_a31_pll6_data __initconst = { 521 .enable = 31, 522 .table = &sun6i_a31_pll6_config, 523 .getter = sun6i_a31_get_pll6_factors, 524 }; 525 526 static const struct factors_data sun5i_a13_ahb_data __initconst = { 527 .mux = 6, 528 .muxmask = BIT(1) | BIT(0), 529 .table = &sun5i_a13_ahb_config, 530 .getter = sun5i_a13_get_ahb_factors, 531 }; 532 533 static const struct factors_data sun6i_ahb1_data __initconst = { 534 .mux = 12, 535 .muxmask = BIT(1) | BIT(0), 536 .table = &sun6i_ahb1_config, 537 .getter = sun6i_get_ahb1_factors, 538 .recalc = sun6i_ahb1_recalc, 539 }; 540 541 static const struct factors_data sun4i_apb1_data __initconst = { 542 .mux = 24, 543 .muxmask = BIT(1) | BIT(0), 544 .table = &sun4i_apb1_config, 545 .getter = sun4i_get_apb1_factors, 546 }; 547 548 static const struct factors_data sun7i_a20_out_data __initconst = { 549 .enable = 31, 550 .mux = 24, 551 .muxmask = BIT(1) | BIT(0), 552 .table = &sun7i_a20_out_config, 553 .getter = sun7i_a20_get_out_factors, 554 }; 555 556 static struct clk * __init sunxi_factors_clk_setup(struct device_node *node, 557 const struct factors_data *data) 558 { 559 void __iomem *reg; 560 561 reg = of_iomap(node, 0); 562 if (!reg) { 563 pr_err("Could not get registers for factors-clk: %pOFn\n", 564 node); 565 return NULL; 566 } 567 568 return sunxi_factors_register(node, data, &clk_lock, reg); 569 } 570 571 static void __init sun4i_pll1_clk_setup(struct device_node *node) 572 { 573 sunxi_factors_clk_setup(node, &sun4i_pll1_data); 574 } 575 CLK_OF_DECLARE(sun4i_pll1, "allwinner,sun4i-a10-pll1-clk", 576 sun4i_pll1_clk_setup); 577 578 static void __init sun6i_pll1_clk_setup(struct device_node *node) 579 { 580 sunxi_factors_clk_setup(node, &sun6i_a31_pll1_data); 581 } 582 CLK_OF_DECLARE(sun6i_pll1, "allwinner,sun6i-a31-pll1-clk", 583 sun6i_pll1_clk_setup); 584 585 static void __init sun8i_pll1_clk_setup(struct device_node *node) 586 { 587 sunxi_factors_clk_setup(node, &sun8i_a23_pll1_data); 588 } 589 CLK_OF_DECLARE(sun8i_pll1, "allwinner,sun8i-a23-pll1-clk", 590 sun8i_pll1_clk_setup); 591 592 static void __init sun7i_pll4_clk_setup(struct device_node *node) 593 { 594 sunxi_factors_clk_setup(node, &sun7i_a20_pll4_data); 595 } 596 CLK_OF_DECLARE(sun7i_pll4, "allwinner,sun7i-a20-pll4-clk", 597 sun7i_pll4_clk_setup); 598 599 static void __init sun5i_ahb_clk_setup(struct device_node *node) 600 { 601 sunxi_factors_clk_setup(node, &sun5i_a13_ahb_data); 602 } 603 CLK_OF_DECLARE(sun5i_ahb, "allwinner,sun5i-a13-ahb-clk", 604 sun5i_ahb_clk_setup); 605 606 static void __init sun6i_ahb1_clk_setup(struct device_node *node) 607 { 608 sunxi_factors_clk_setup(node, &sun6i_ahb1_data); 609 } 610 CLK_OF_DECLARE(sun6i_a31_ahb1, "allwinner,sun6i-a31-ahb1-clk", 611 sun6i_ahb1_clk_setup); 612 613 static void __init sun4i_apb1_clk_setup(struct device_node *node) 614 { 615 sunxi_factors_clk_setup(node, &sun4i_apb1_data); 616 } 617 CLK_OF_DECLARE(sun4i_apb1, "allwinner,sun4i-a10-apb1-clk", 618 sun4i_apb1_clk_setup); 619 620 static void __init sun7i_out_clk_setup(struct device_node *node) 621 { 622 sunxi_factors_clk_setup(node, &sun7i_a20_out_data); 623 } 624 CLK_OF_DECLARE(sun7i_out, "allwinner,sun7i-a20-out-clk", 625 sun7i_out_clk_setup); 626 627 628 /** 629 * sunxi_mux_clk_setup() - Setup function for muxes 630 */ 631 632 #define SUNXI_MUX_GATE_WIDTH 2 633 634 struct mux_data { 635 u8 shift; 636 }; 637 638 static const struct mux_data sun4i_cpu_mux_data __initconst = { 639 .shift = 16, 640 }; 641 642 static const struct mux_data sun6i_a31_ahb1_mux_data __initconst = { 643 .shift = 12, 644 }; 645 646 static const struct mux_data sun8i_h3_ahb2_mux_data __initconst = { 647 .shift = 0, 648 }; 649 650 static struct clk * __init sunxi_mux_clk_setup(struct device_node *node, 651 const struct mux_data *data, 652 unsigned long flags) 653 { 654 struct clk *clk; 655 const char *clk_name = node->name; 656 const char *parents[SUNXI_MAX_PARENTS]; 657 void __iomem *reg; 658 int i; 659 660 reg = of_iomap(node, 0); 661 if (!reg) { 662 pr_err("Could not map registers for mux-clk: %pOF\n", node); 663 return NULL; 664 } 665 666 i = of_clk_parent_fill(node, parents, SUNXI_MAX_PARENTS); 667 if (of_property_read_string(node, "clock-output-names", &clk_name)) { 668 pr_err("%s: could not read clock-output-names from \"%pOF\"\n", 669 __func__, node); 670 goto out_unmap; 671 } 672 673 clk = clk_register_mux(NULL, clk_name, parents, i, 674 CLK_SET_RATE_PARENT | flags, reg, 675 data->shift, SUNXI_MUX_GATE_WIDTH, 676 0, &clk_lock); 677 678 if (IS_ERR(clk)) { 679 pr_err("%s: failed to register mux clock %s: %ld\n", __func__, 680 clk_name, PTR_ERR(clk)); 681 goto out_unmap; 682 } 683 684 if (of_clk_add_provider(node, of_clk_src_simple_get, clk)) { 685 pr_err("%s: failed to add clock provider for %s\n", 686 __func__, clk_name); 687 clk_unregister_divider(clk); 688 goto out_unmap; 689 } 690 691 return clk; 692 out_unmap: 693 iounmap(reg); 694 return NULL; 695 } 696 697 static void __init sun4i_cpu_clk_setup(struct device_node *node) 698 { 699 /* Protect CPU clock */ 700 sunxi_mux_clk_setup(node, &sun4i_cpu_mux_data, CLK_IS_CRITICAL); 701 } 702 CLK_OF_DECLARE(sun4i_cpu, "allwinner,sun4i-a10-cpu-clk", 703 sun4i_cpu_clk_setup); 704 705 static void __init sun6i_ahb1_mux_clk_setup(struct device_node *node) 706 { 707 sunxi_mux_clk_setup(node, &sun6i_a31_ahb1_mux_data, 0); 708 } 709 CLK_OF_DECLARE(sun6i_ahb1_mux, "allwinner,sun6i-a31-ahb1-mux-clk", 710 sun6i_ahb1_mux_clk_setup); 711 712 static void __init sun8i_ahb2_clk_setup(struct device_node *node) 713 { 714 sunxi_mux_clk_setup(node, &sun8i_h3_ahb2_mux_data, 0); 715 } 716 CLK_OF_DECLARE(sun8i_ahb2, "allwinner,sun8i-h3-ahb2-clk", 717 sun8i_ahb2_clk_setup); 718 719 720 /** 721 * sunxi_divider_clk_setup() - Setup function for simple divider clocks 722 */ 723 724 struct div_data { 725 u8 shift; 726 u8 pow; 727 u8 width; 728 const struct clk_div_table *table; 729 }; 730 731 static const struct div_data sun4i_axi_data __initconst = { 732 .shift = 0, 733 .pow = 0, 734 .width = 2, 735 }; 736 737 static const struct clk_div_table sun8i_a23_axi_table[] __initconst = { 738 { .val = 0, .div = 1 }, 739 { .val = 1, .div = 2 }, 740 { .val = 2, .div = 3 }, 741 { .val = 3, .div = 4 }, 742 { .val = 4, .div = 4 }, 743 { .val = 5, .div = 4 }, 744 { .val = 6, .div = 4 }, 745 { .val = 7, .div = 4 }, 746 { } /* sentinel */ 747 }; 748 749 static const struct div_data sun8i_a23_axi_data __initconst = { 750 .width = 3, 751 .table = sun8i_a23_axi_table, 752 }; 753 754 static const struct div_data sun4i_ahb_data __initconst = { 755 .shift = 4, 756 .pow = 1, 757 .width = 2, 758 }; 759 760 static const struct clk_div_table sun4i_apb0_table[] __initconst = { 761 { .val = 0, .div = 2 }, 762 { .val = 1, .div = 2 }, 763 { .val = 2, .div = 4 }, 764 { .val = 3, .div = 8 }, 765 { } /* sentinel */ 766 }; 767 768 static const struct div_data sun4i_apb0_data __initconst = { 769 .shift = 8, 770 .pow = 1, 771 .width = 2, 772 .table = sun4i_apb0_table, 773 }; 774 775 static void __init sunxi_divider_clk_setup(struct device_node *node, 776 const struct div_data *data) 777 { 778 struct clk *clk; 779 const char *clk_name = node->name; 780 const char *clk_parent; 781 void __iomem *reg; 782 783 reg = of_iomap(node, 0); 784 if (!reg) { 785 pr_err("Could not map registers for mux-clk: %pOF\n", node); 786 return; 787 } 788 789 clk_parent = of_clk_get_parent_name(node, 0); 790 791 if (of_property_read_string(node, "clock-output-names", &clk_name)) { 792 pr_err("%s: could not read clock-output-names from \"%pOF\"\n", 793 __func__, node); 794 goto out_unmap; 795 } 796 797 clk = clk_register_divider_table(NULL, clk_name, clk_parent, 0, 798 reg, data->shift, data->width, 799 data->pow ? CLK_DIVIDER_POWER_OF_TWO : 0, 800 data->table, &clk_lock); 801 if (IS_ERR(clk)) { 802 pr_err("%s: failed to register divider clock %s: %ld\n", 803 __func__, clk_name, PTR_ERR(clk)); 804 goto out_unmap; 805 } 806 807 if (of_clk_add_provider(node, of_clk_src_simple_get, clk)) { 808 pr_err("%s: failed to add clock provider for %s\n", 809 __func__, clk_name); 810 goto out_unregister; 811 } 812 813 if (clk_register_clkdev(clk, clk_name, NULL)) { 814 of_clk_del_provider(node); 815 goto out_unregister; 816 } 817 818 return; 819 out_unregister: 820 clk_unregister_divider(clk); 821 822 out_unmap: 823 iounmap(reg); 824 } 825 826 static void __init sun4i_ahb_clk_setup(struct device_node *node) 827 { 828 sunxi_divider_clk_setup(node, &sun4i_ahb_data); 829 } 830 CLK_OF_DECLARE(sun4i_ahb, "allwinner,sun4i-a10-ahb-clk", 831 sun4i_ahb_clk_setup); 832 833 static void __init sun4i_apb0_clk_setup(struct device_node *node) 834 { 835 sunxi_divider_clk_setup(node, &sun4i_apb0_data); 836 } 837 CLK_OF_DECLARE(sun4i_apb0, "allwinner,sun4i-a10-apb0-clk", 838 sun4i_apb0_clk_setup); 839 840 static void __init sun4i_axi_clk_setup(struct device_node *node) 841 { 842 sunxi_divider_clk_setup(node, &sun4i_axi_data); 843 } 844 CLK_OF_DECLARE(sun4i_axi, "allwinner,sun4i-a10-axi-clk", 845 sun4i_axi_clk_setup); 846 847 static void __init sun8i_axi_clk_setup(struct device_node *node) 848 { 849 sunxi_divider_clk_setup(node, &sun8i_a23_axi_data); 850 } 851 CLK_OF_DECLARE(sun8i_axi, "allwinner,sun8i-a23-axi-clk", 852 sun8i_axi_clk_setup); 853 854 855 856 /** 857 * sunxi_gates_clk_setup() - Setup function for leaf gates on clocks 858 */ 859 860 #define SUNXI_GATES_MAX_SIZE 64 861 862 struct gates_data { 863 DECLARE_BITMAP(mask, SUNXI_GATES_MAX_SIZE); 864 }; 865 866 /** 867 * sunxi_divs_clk_setup() helper data 868 */ 869 870 #define SUNXI_DIVS_MAX_QTY 4 871 #define SUNXI_DIVISOR_WIDTH 2 872 873 struct divs_data { 874 const struct factors_data *factors; /* data for the factor clock */ 875 int ndivs; /* number of outputs */ 876 /* 877 * List of outputs. Refer to the diagram for sunxi_divs_clk_setup(): 878 * self or base factor clock refers to the output from the pll 879 * itself. The remaining refer to fixed or configurable divider 880 * outputs. 881 */ 882 struct { 883 u8 self; /* is it the base factor clock? (only one) */ 884 u8 fixed; /* is it a fixed divisor? if not... */ 885 struct clk_div_table *table; /* is it a table based divisor? */ 886 u8 shift; /* otherwise it's a normal divisor with this shift */ 887 u8 pow; /* is it power-of-two based? */ 888 u8 gate; /* is it independently gateable? */ 889 bool critical; 890 } div[SUNXI_DIVS_MAX_QTY]; 891 }; 892 893 static struct clk_div_table pll6_sata_tbl[] = { 894 { .val = 0, .div = 6, }, 895 { .val = 1, .div = 12, }, 896 { .val = 2, .div = 18, }, 897 { .val = 3, .div = 24, }, 898 { } /* sentinel */ 899 }; 900 901 static const struct divs_data pll5_divs_data __initconst = { 902 .factors = &sun4i_pll5_data, 903 .ndivs = 2, 904 .div = { 905 /* Protect PLL5_DDR */ 906 { .shift = 0, .pow = 0, .critical = true }, /* M, DDR */ 907 { .shift = 16, .pow = 1, }, /* P, other */ 908 /* No output for the base factor clock */ 909 } 910 }; 911 912 static const struct divs_data pll6_divs_data __initconst = { 913 .factors = &sun4i_pll5_data, 914 .ndivs = 4, 915 .div = { 916 { .shift = 0, .table = pll6_sata_tbl, .gate = 14 }, /* M, SATA */ 917 { .fixed = 2 }, /* P, other */ 918 { .self = 1 }, /* base factor clock, 2x */ 919 { .fixed = 4 }, /* pll6 / 4, used as ahb input */ 920 } 921 }; 922 923 static const struct divs_data sun6i_a31_pll6_divs_data __initconst = { 924 .factors = &sun6i_a31_pll6_data, 925 .ndivs = 2, 926 .div = { 927 { .fixed = 2 }, /* normal output */ 928 { .self = 1 }, /* base factor clock, 2x */ 929 } 930 }; 931 932 /** 933 * sunxi_divs_clk_setup() - Setup function for leaf divisors on clocks 934 * 935 * These clocks look something like this 936 * ________________________ 937 * | ___divisor 1---|----> to consumer 938 * parent >--| pll___/___divisor 2---|----> to consumer 939 * | \_______________|____> to consumer 940 * |________________________| 941 */ 942 943 static struct clk ** __init sunxi_divs_clk_setup(struct device_node *node, 944 const struct divs_data *data) 945 { 946 struct clk_onecell_data *clk_data; 947 const char *parent; 948 const char *clk_name; 949 struct clk **clks, *pclk; 950 struct clk_hw *gate_hw, *rate_hw; 951 const struct clk_ops *rate_ops; 952 struct clk_gate *gate = NULL; 953 struct clk_fixed_factor *fix_factor; 954 struct clk_divider *divider; 955 struct factors_data factors = *data->factors; 956 char *derived_name = NULL; 957 void __iomem *reg; 958 int ndivs = SUNXI_DIVS_MAX_QTY, i = 0; 959 int flags, clkflags; 960 961 /* if number of children known, use it */ 962 if (data->ndivs) 963 ndivs = data->ndivs; 964 965 /* Try to find a name for base factor clock */ 966 for (i = 0; i < ndivs; i++) { 967 if (data->div[i].self) { 968 of_property_read_string_index(node, "clock-output-names", 969 i, &factors.name); 970 break; 971 } 972 } 973 /* If we don't have a .self clk use the first output-name up to '_' */ 974 if (factors.name == NULL) { 975 char *endp; 976 977 of_property_read_string_index(node, "clock-output-names", 978 0, &clk_name); 979 endp = strchr(clk_name, '_'); 980 if (endp) { 981 derived_name = kstrndup(clk_name, endp - clk_name, 982 GFP_KERNEL); 983 if (!derived_name) 984 return NULL; 985 factors.name = derived_name; 986 } else { 987 factors.name = clk_name; 988 } 989 } 990 991 /* Set up factor clock that we will be dividing */ 992 pclk = sunxi_factors_clk_setup(node, &factors); 993 if (!pclk) 994 return NULL; 995 996 parent = __clk_get_name(pclk); 997 kfree(derived_name); 998 999 reg = of_iomap(node, 0); 1000 if (!reg) { 1001 pr_err("Could not map registers for divs-clk: %pOF\n", node); 1002 return NULL; 1003 } 1004 1005 clk_data = kmalloc(sizeof(struct clk_onecell_data), GFP_KERNEL); 1006 if (!clk_data) 1007 goto out_unmap; 1008 1009 clks = kcalloc(ndivs, sizeof(*clks), GFP_KERNEL); 1010 if (!clks) 1011 goto free_clkdata; 1012 1013 clk_data->clks = clks; 1014 1015 /* It's not a good idea to have automatic reparenting changing 1016 * our RAM clock! */ 1017 clkflags = !strcmp("pll5", parent) ? 0 : CLK_SET_RATE_PARENT; 1018 1019 for (i = 0; i < ndivs; i++) { 1020 if (of_property_read_string_index(node, "clock-output-names", 1021 i, &clk_name) != 0) 1022 break; 1023 1024 /* If this is the base factor clock, only update clks */ 1025 if (data->div[i].self) { 1026 clk_data->clks[i] = pclk; 1027 continue; 1028 } 1029 1030 gate_hw = NULL; 1031 rate_hw = NULL; 1032 rate_ops = NULL; 1033 1034 /* If this leaf clock can be gated, create a gate */ 1035 if (data->div[i].gate) { 1036 gate = kzalloc(sizeof(*gate), GFP_KERNEL); 1037 if (!gate) 1038 goto free_clks; 1039 1040 gate->reg = reg; 1041 gate->bit_idx = data->div[i].gate; 1042 gate->lock = &clk_lock; 1043 1044 gate_hw = &gate->hw; 1045 } 1046 1047 /* Leaves can be fixed or configurable divisors */ 1048 if (data->div[i].fixed) { 1049 fix_factor = kzalloc(sizeof(*fix_factor), GFP_KERNEL); 1050 if (!fix_factor) 1051 goto free_gate; 1052 1053 fix_factor->mult = 1; 1054 fix_factor->div = data->div[i].fixed; 1055 1056 rate_hw = &fix_factor->hw; 1057 rate_ops = &clk_fixed_factor_ops; 1058 } else { 1059 divider = kzalloc(sizeof(*divider), GFP_KERNEL); 1060 if (!divider) 1061 goto free_gate; 1062 1063 flags = data->div[i].pow ? CLK_DIVIDER_POWER_OF_TWO : 0; 1064 1065 divider->reg = reg; 1066 divider->shift = data->div[i].shift; 1067 divider->width = SUNXI_DIVISOR_WIDTH; 1068 divider->flags = flags; 1069 divider->lock = &clk_lock; 1070 divider->table = data->div[i].table; 1071 1072 rate_hw = ÷r->hw; 1073 rate_ops = &clk_divider_ops; 1074 } 1075 1076 /* Wrap the (potential) gate and the divisor on a composite 1077 * clock to unify them */ 1078 clks[i] = clk_register_composite(NULL, clk_name, &parent, 1, 1079 NULL, NULL, 1080 rate_hw, rate_ops, 1081 gate_hw, &clk_gate_ops, 1082 clkflags | 1083 (data->div[i].critical ? 1084 CLK_IS_CRITICAL : 0)); 1085 1086 WARN_ON(IS_ERR(clk_data->clks[i])); 1087 } 1088 1089 /* Adjust to the real max */ 1090 clk_data->clk_num = i; 1091 1092 if (of_clk_add_provider(node, of_clk_src_onecell_get, clk_data)) { 1093 pr_err("%s: failed to add clock provider for %s\n", 1094 __func__, clk_name); 1095 goto free_gate; 1096 } 1097 1098 return clks; 1099 free_gate: 1100 kfree(gate); 1101 free_clks: 1102 kfree(clks); 1103 free_clkdata: 1104 kfree(clk_data); 1105 out_unmap: 1106 iounmap(reg); 1107 return NULL; 1108 } 1109 1110 static void __init sun4i_pll5_clk_setup(struct device_node *node) 1111 { 1112 sunxi_divs_clk_setup(node, &pll5_divs_data); 1113 } 1114 CLK_OF_DECLARE(sun4i_pll5, "allwinner,sun4i-a10-pll5-clk", 1115 sun4i_pll5_clk_setup); 1116 1117 static void __init sun4i_pll6_clk_setup(struct device_node *node) 1118 { 1119 sunxi_divs_clk_setup(node, &pll6_divs_data); 1120 } 1121 CLK_OF_DECLARE(sun4i_pll6, "allwinner,sun4i-a10-pll6-clk", 1122 sun4i_pll6_clk_setup); 1123 1124 static void __init sun6i_pll6_clk_setup(struct device_node *node) 1125 { 1126 sunxi_divs_clk_setup(node, &sun6i_a31_pll6_divs_data); 1127 } 1128 CLK_OF_DECLARE(sun6i_pll6, "allwinner,sun6i-a31-pll6-clk", 1129 sun6i_pll6_clk_setup); 1130 1131 /* 1132 * sun6i display 1133 * 1134 * rate = parent_rate / (m + 1); 1135 */ 1136 static void sun6i_display_factors(struct factors_request *req) 1137 { 1138 u8 m; 1139 1140 if (req->rate > req->parent_rate) 1141 req->rate = req->parent_rate; 1142 1143 m = DIV_ROUND_UP(req->parent_rate, req->rate); 1144 1145 req->rate = req->parent_rate / m; 1146 req->m = m - 1; 1147 } 1148 1149 static const struct clk_factors_config sun6i_display_config = { 1150 .mshift = 0, 1151 .mwidth = 4, 1152 }; 1153 1154 static const struct factors_data sun6i_display_data __initconst = { 1155 .enable = 31, 1156 .mux = 24, 1157 .muxmask = BIT(2) | BIT(1) | BIT(0), 1158 .table = &sun6i_display_config, 1159 .getter = sun6i_display_factors, 1160 }; 1161 1162 static void __init sun6i_display_setup(struct device_node *node) 1163 { 1164 sunxi_factors_clk_setup(node, &sun6i_display_data); 1165 } 1166 CLK_OF_DECLARE(sun6i_display, "allwinner,sun6i-a31-display-clk", 1167 sun6i_display_setup); 1168