1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 2014 MundoReader S.L. 4 * Author: Heiko Stuebner <heiko@sntech.de> 5 * 6 * Copyright (c) 2015 Rockchip Electronics Co. Ltd. 7 * Author: Xing Zheng <zhengxing@rock-chips.com> 8 */ 9 10 #include <asm/div64.h> 11 #include <linux/slab.h> 12 #include <linux/io.h> 13 #include <linux/delay.h> 14 #include <linux/clk-provider.h> 15 #include <linux/iopoll.h> 16 #include <linux/regmap.h> 17 #include <linux/clk.h> 18 #include "clk.h" 19 20 #define PLL_MODE_MASK 0x3 21 #define PLL_MODE_SLOW 0x0 22 #define PLL_MODE_NORM 0x1 23 #define PLL_MODE_DEEP 0x2 24 #define PLL_RK3328_MODE_MASK 0x1 25 26 struct rockchip_clk_pll { 27 struct clk_hw hw; 28 29 struct clk_mux pll_mux; 30 const struct clk_ops *pll_mux_ops; 31 32 struct notifier_block clk_nb; 33 34 void __iomem *reg_base; 35 int lock_offset; 36 unsigned int lock_shift; 37 enum rockchip_pll_type type; 38 u8 flags; 39 const struct rockchip_pll_rate_table *rate_table; 40 unsigned int rate_count; 41 spinlock_t *lock; 42 43 struct rockchip_clk_provider *ctx; 44 }; 45 46 #define to_rockchip_clk_pll(_hw) container_of(_hw, struct rockchip_clk_pll, hw) 47 #define to_rockchip_clk_pll_nb(nb) \ 48 container_of(nb, struct rockchip_clk_pll, clk_nb) 49 50 static const struct rockchip_pll_rate_table *rockchip_get_pll_settings( 51 struct rockchip_clk_pll *pll, unsigned long rate) 52 { 53 const struct rockchip_pll_rate_table *rate_table = pll->rate_table; 54 int i; 55 56 for (i = 0; i < pll->rate_count; i++) { 57 if (rate == rate_table[i].rate) 58 return &rate_table[i]; 59 } 60 61 return NULL; 62 } 63 64 static long rockchip_pll_round_rate(struct clk_hw *hw, 65 unsigned long drate, unsigned long *prate) 66 { 67 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 68 const struct rockchip_pll_rate_table *rate_table = pll->rate_table; 69 int i; 70 71 /* Assumming rate_table is in descending order */ 72 for (i = 0; i < pll->rate_count; i++) { 73 if (drate >= rate_table[i].rate) 74 return rate_table[i].rate; 75 } 76 77 /* return minimum supported value */ 78 return rate_table[i - 1].rate; 79 } 80 81 /* 82 * Wait for the pll to reach the locked state. 83 * The calling set_rate function is responsible for making sure the 84 * grf regmap is available. 85 */ 86 static int rockchip_pll_wait_lock(struct rockchip_clk_pll *pll) 87 { 88 struct regmap *grf = pll->ctx->grf; 89 unsigned int val; 90 int ret; 91 92 ret = regmap_read_poll_timeout(grf, pll->lock_offset, val, 93 val & BIT(pll->lock_shift), 0, 1000); 94 if (ret) 95 pr_err("%s: timeout waiting for pll to lock\n", __func__); 96 97 return ret; 98 } 99 100 /* 101 * PLL used in RK3036 102 */ 103 104 #define RK3036_PLLCON(i) (i * 0x4) 105 #define RK3036_PLLCON0_FBDIV_MASK 0xfff 106 #define RK3036_PLLCON0_FBDIV_SHIFT 0 107 #define RK3036_PLLCON0_POSTDIV1_MASK 0x7 108 #define RK3036_PLLCON0_POSTDIV1_SHIFT 12 109 #define RK3036_PLLCON1_REFDIV_MASK 0x3f 110 #define RK3036_PLLCON1_REFDIV_SHIFT 0 111 #define RK3036_PLLCON1_POSTDIV2_MASK 0x7 112 #define RK3036_PLLCON1_POSTDIV2_SHIFT 6 113 #define RK3036_PLLCON1_LOCK_STATUS BIT(10) 114 #define RK3036_PLLCON1_DSMPD_MASK 0x1 115 #define RK3036_PLLCON1_DSMPD_SHIFT 12 116 #define RK3036_PLLCON1_PWRDOWN BIT(13) 117 #define RK3036_PLLCON2_FRAC_MASK 0xffffff 118 #define RK3036_PLLCON2_FRAC_SHIFT 0 119 120 static int rockchip_rk3036_pll_wait_lock(struct rockchip_clk_pll *pll) 121 { 122 u32 pllcon; 123 int ret; 124 125 /* 126 * Lock time typical 250, max 500 input clock cycles @24MHz 127 * So define a very safe maximum of 1000us, meaning 24000 cycles. 128 */ 129 ret = readl_relaxed_poll_timeout(pll->reg_base + RK3036_PLLCON(1), 130 pllcon, 131 pllcon & RK3036_PLLCON1_LOCK_STATUS, 132 0, 1000); 133 if (ret) 134 pr_err("%s: timeout waiting for pll to lock\n", __func__); 135 136 return ret; 137 } 138 139 static void rockchip_rk3036_pll_get_params(struct rockchip_clk_pll *pll, 140 struct rockchip_pll_rate_table *rate) 141 { 142 u32 pllcon; 143 144 pllcon = readl_relaxed(pll->reg_base + RK3036_PLLCON(0)); 145 rate->fbdiv = ((pllcon >> RK3036_PLLCON0_FBDIV_SHIFT) 146 & RK3036_PLLCON0_FBDIV_MASK); 147 rate->postdiv1 = ((pllcon >> RK3036_PLLCON0_POSTDIV1_SHIFT) 148 & RK3036_PLLCON0_POSTDIV1_MASK); 149 150 pllcon = readl_relaxed(pll->reg_base + RK3036_PLLCON(1)); 151 rate->refdiv = ((pllcon >> RK3036_PLLCON1_REFDIV_SHIFT) 152 & RK3036_PLLCON1_REFDIV_MASK); 153 rate->postdiv2 = ((pllcon >> RK3036_PLLCON1_POSTDIV2_SHIFT) 154 & RK3036_PLLCON1_POSTDIV2_MASK); 155 rate->dsmpd = ((pllcon >> RK3036_PLLCON1_DSMPD_SHIFT) 156 & RK3036_PLLCON1_DSMPD_MASK); 157 158 pllcon = readl_relaxed(pll->reg_base + RK3036_PLLCON(2)); 159 rate->frac = ((pllcon >> RK3036_PLLCON2_FRAC_SHIFT) 160 & RK3036_PLLCON2_FRAC_MASK); 161 } 162 163 static unsigned long rockchip_rk3036_pll_recalc_rate(struct clk_hw *hw, 164 unsigned long prate) 165 { 166 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 167 struct rockchip_pll_rate_table cur; 168 u64 rate64 = prate; 169 170 rockchip_rk3036_pll_get_params(pll, &cur); 171 172 rate64 *= cur.fbdiv; 173 do_div(rate64, cur.refdiv); 174 175 if (cur.dsmpd == 0) { 176 /* fractional mode */ 177 u64 frac_rate64 = prate * cur.frac; 178 179 do_div(frac_rate64, cur.refdiv); 180 rate64 += frac_rate64 >> 24; 181 } 182 183 do_div(rate64, cur.postdiv1); 184 do_div(rate64, cur.postdiv2); 185 186 return (unsigned long)rate64; 187 } 188 189 static int rockchip_rk3036_pll_set_params(struct rockchip_clk_pll *pll, 190 const struct rockchip_pll_rate_table *rate) 191 { 192 const struct clk_ops *pll_mux_ops = pll->pll_mux_ops; 193 struct clk_mux *pll_mux = &pll->pll_mux; 194 struct rockchip_pll_rate_table cur; 195 u32 pllcon; 196 int rate_change_remuxed = 0; 197 int cur_parent; 198 int ret; 199 200 pr_debug("%s: rate settings for %lu fbdiv: %d, postdiv1: %d, refdiv: %d, postdiv2: %d, dsmpd: %d, frac: %d\n", 201 __func__, rate->rate, rate->fbdiv, rate->postdiv1, rate->refdiv, 202 rate->postdiv2, rate->dsmpd, rate->frac); 203 204 rockchip_rk3036_pll_get_params(pll, &cur); 205 cur.rate = 0; 206 207 cur_parent = pll_mux_ops->get_parent(&pll_mux->hw); 208 if (cur_parent == PLL_MODE_NORM) { 209 pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_SLOW); 210 rate_change_remuxed = 1; 211 } 212 213 /* update pll values */ 214 writel_relaxed(HIWORD_UPDATE(rate->fbdiv, RK3036_PLLCON0_FBDIV_MASK, 215 RK3036_PLLCON0_FBDIV_SHIFT) | 216 HIWORD_UPDATE(rate->postdiv1, RK3036_PLLCON0_POSTDIV1_MASK, 217 RK3036_PLLCON0_POSTDIV1_SHIFT), 218 pll->reg_base + RK3036_PLLCON(0)); 219 220 writel_relaxed(HIWORD_UPDATE(rate->refdiv, RK3036_PLLCON1_REFDIV_MASK, 221 RK3036_PLLCON1_REFDIV_SHIFT) | 222 HIWORD_UPDATE(rate->postdiv2, RK3036_PLLCON1_POSTDIV2_MASK, 223 RK3036_PLLCON1_POSTDIV2_SHIFT) | 224 HIWORD_UPDATE(rate->dsmpd, RK3036_PLLCON1_DSMPD_MASK, 225 RK3036_PLLCON1_DSMPD_SHIFT), 226 pll->reg_base + RK3036_PLLCON(1)); 227 228 /* GPLL CON2 is not HIWORD_MASK */ 229 pllcon = readl_relaxed(pll->reg_base + RK3036_PLLCON(2)); 230 pllcon &= ~(RK3036_PLLCON2_FRAC_MASK << RK3036_PLLCON2_FRAC_SHIFT); 231 pllcon |= rate->frac << RK3036_PLLCON2_FRAC_SHIFT; 232 writel_relaxed(pllcon, pll->reg_base + RK3036_PLLCON(2)); 233 234 /* wait for the pll to lock */ 235 ret = rockchip_rk3036_pll_wait_lock(pll); 236 if (ret) { 237 pr_warn("%s: pll update unsuccessful, trying to restore old params\n", 238 __func__); 239 rockchip_rk3036_pll_set_params(pll, &cur); 240 } 241 242 if (rate_change_remuxed) 243 pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_NORM); 244 245 return ret; 246 } 247 248 static int rockchip_rk3036_pll_set_rate(struct clk_hw *hw, unsigned long drate, 249 unsigned long prate) 250 { 251 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 252 const struct rockchip_pll_rate_table *rate; 253 254 pr_debug("%s: changing %s to %lu with a parent rate of %lu\n", 255 __func__, __clk_get_name(hw->clk), drate, prate); 256 257 /* Get required rate settings from table */ 258 rate = rockchip_get_pll_settings(pll, drate); 259 if (!rate) { 260 pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__, 261 drate, __clk_get_name(hw->clk)); 262 return -EINVAL; 263 } 264 265 return rockchip_rk3036_pll_set_params(pll, rate); 266 } 267 268 static int rockchip_rk3036_pll_enable(struct clk_hw *hw) 269 { 270 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 271 272 writel(HIWORD_UPDATE(0, RK3036_PLLCON1_PWRDOWN, 0), 273 pll->reg_base + RK3036_PLLCON(1)); 274 rockchip_rk3036_pll_wait_lock(pll); 275 276 return 0; 277 } 278 279 static void rockchip_rk3036_pll_disable(struct clk_hw *hw) 280 { 281 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 282 283 writel(HIWORD_UPDATE(RK3036_PLLCON1_PWRDOWN, 284 RK3036_PLLCON1_PWRDOWN, 0), 285 pll->reg_base + RK3036_PLLCON(1)); 286 } 287 288 static int rockchip_rk3036_pll_is_enabled(struct clk_hw *hw) 289 { 290 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 291 u32 pllcon = readl(pll->reg_base + RK3036_PLLCON(1)); 292 293 return !(pllcon & RK3036_PLLCON1_PWRDOWN); 294 } 295 296 static int rockchip_rk3036_pll_init(struct clk_hw *hw) 297 { 298 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 299 const struct rockchip_pll_rate_table *rate; 300 struct rockchip_pll_rate_table cur; 301 unsigned long drate; 302 303 if (!(pll->flags & ROCKCHIP_PLL_SYNC_RATE)) 304 return 0; 305 306 drate = clk_hw_get_rate(hw); 307 rate = rockchip_get_pll_settings(pll, drate); 308 309 /* when no rate setting for the current rate, rely on clk_set_rate */ 310 if (!rate) 311 return 0; 312 313 rockchip_rk3036_pll_get_params(pll, &cur); 314 315 pr_debug("%s: pll %s@%lu: Hz\n", __func__, __clk_get_name(hw->clk), 316 drate); 317 pr_debug("old - fbdiv: %d, postdiv1: %d, refdiv: %d, postdiv2: %d, dsmpd: %d, frac: %d\n", 318 cur.fbdiv, cur.postdiv1, cur.refdiv, cur.postdiv2, 319 cur.dsmpd, cur.frac); 320 pr_debug("new - fbdiv: %d, postdiv1: %d, refdiv: %d, postdiv2: %d, dsmpd: %d, frac: %d\n", 321 rate->fbdiv, rate->postdiv1, rate->refdiv, rate->postdiv2, 322 rate->dsmpd, rate->frac); 323 324 if (rate->fbdiv != cur.fbdiv || rate->postdiv1 != cur.postdiv1 || 325 rate->refdiv != cur.refdiv || rate->postdiv2 != cur.postdiv2 || 326 rate->dsmpd != cur.dsmpd || 327 (!cur.dsmpd && (rate->frac != cur.frac))) { 328 struct clk *parent = clk_get_parent(hw->clk); 329 330 if (!parent) { 331 pr_warn("%s: parent of %s not available\n", 332 __func__, __clk_get_name(hw->clk)); 333 return 0; 334 } 335 336 pr_debug("%s: pll %s: rate params do not match rate table, adjusting\n", 337 __func__, __clk_get_name(hw->clk)); 338 rockchip_rk3036_pll_set_params(pll, rate); 339 } 340 341 return 0; 342 } 343 344 static const struct clk_ops rockchip_rk3036_pll_clk_norate_ops = { 345 .recalc_rate = rockchip_rk3036_pll_recalc_rate, 346 .enable = rockchip_rk3036_pll_enable, 347 .disable = rockchip_rk3036_pll_disable, 348 .is_enabled = rockchip_rk3036_pll_is_enabled, 349 }; 350 351 static const struct clk_ops rockchip_rk3036_pll_clk_ops = { 352 .recalc_rate = rockchip_rk3036_pll_recalc_rate, 353 .round_rate = rockchip_pll_round_rate, 354 .set_rate = rockchip_rk3036_pll_set_rate, 355 .enable = rockchip_rk3036_pll_enable, 356 .disable = rockchip_rk3036_pll_disable, 357 .is_enabled = rockchip_rk3036_pll_is_enabled, 358 .init = rockchip_rk3036_pll_init, 359 }; 360 361 /* 362 * PLL used in RK3066, RK3188 and RK3288 363 */ 364 365 #define RK3066_PLL_RESET_DELAY(nr) ((nr * 500) / 24 + 1) 366 367 #define RK3066_PLLCON(i) (i * 0x4) 368 #define RK3066_PLLCON0_OD_MASK 0xf 369 #define RK3066_PLLCON0_OD_SHIFT 0 370 #define RK3066_PLLCON0_NR_MASK 0x3f 371 #define RK3066_PLLCON0_NR_SHIFT 8 372 #define RK3066_PLLCON1_NF_MASK 0x1fff 373 #define RK3066_PLLCON1_NF_SHIFT 0 374 #define RK3066_PLLCON2_NB_MASK 0xfff 375 #define RK3066_PLLCON2_NB_SHIFT 0 376 #define RK3066_PLLCON3_RESET (1 << 5) 377 #define RK3066_PLLCON3_PWRDOWN (1 << 1) 378 #define RK3066_PLLCON3_BYPASS (1 << 0) 379 380 static void rockchip_rk3066_pll_get_params(struct rockchip_clk_pll *pll, 381 struct rockchip_pll_rate_table *rate) 382 { 383 u32 pllcon; 384 385 pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(0)); 386 rate->nr = ((pllcon >> RK3066_PLLCON0_NR_SHIFT) 387 & RK3066_PLLCON0_NR_MASK) + 1; 388 rate->no = ((pllcon >> RK3066_PLLCON0_OD_SHIFT) 389 & RK3066_PLLCON0_OD_MASK) + 1; 390 391 pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(1)); 392 rate->nf = ((pllcon >> RK3066_PLLCON1_NF_SHIFT) 393 & RK3066_PLLCON1_NF_MASK) + 1; 394 395 pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(2)); 396 rate->nb = ((pllcon >> RK3066_PLLCON2_NB_SHIFT) 397 & RK3066_PLLCON2_NB_MASK) + 1; 398 } 399 400 static unsigned long rockchip_rk3066_pll_recalc_rate(struct clk_hw *hw, 401 unsigned long prate) 402 { 403 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 404 struct rockchip_pll_rate_table cur; 405 u64 rate64 = prate; 406 u32 pllcon; 407 408 pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(3)); 409 if (pllcon & RK3066_PLLCON3_BYPASS) { 410 pr_debug("%s: pll %s is bypassed\n", __func__, 411 clk_hw_get_name(hw)); 412 return prate; 413 } 414 415 rockchip_rk3066_pll_get_params(pll, &cur); 416 417 rate64 *= cur.nf; 418 do_div(rate64, cur.nr); 419 do_div(rate64, cur.no); 420 421 return (unsigned long)rate64; 422 } 423 424 static int rockchip_rk3066_pll_set_params(struct rockchip_clk_pll *pll, 425 const struct rockchip_pll_rate_table *rate) 426 { 427 const struct clk_ops *pll_mux_ops = pll->pll_mux_ops; 428 struct clk_mux *pll_mux = &pll->pll_mux; 429 struct rockchip_pll_rate_table cur; 430 int rate_change_remuxed = 0; 431 int cur_parent; 432 int ret; 433 434 pr_debug("%s: rate settings for %lu (nr, no, nf): (%d, %d, %d)\n", 435 __func__, rate->rate, rate->nr, rate->no, rate->nf); 436 437 rockchip_rk3066_pll_get_params(pll, &cur); 438 cur.rate = 0; 439 440 cur_parent = pll_mux_ops->get_parent(&pll_mux->hw); 441 if (cur_parent == PLL_MODE_NORM) { 442 pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_SLOW); 443 rate_change_remuxed = 1; 444 } 445 446 /* enter reset mode */ 447 writel(HIWORD_UPDATE(RK3066_PLLCON3_RESET, RK3066_PLLCON3_RESET, 0), 448 pll->reg_base + RK3066_PLLCON(3)); 449 450 /* update pll values */ 451 writel(HIWORD_UPDATE(rate->nr - 1, RK3066_PLLCON0_NR_MASK, 452 RK3066_PLLCON0_NR_SHIFT) | 453 HIWORD_UPDATE(rate->no - 1, RK3066_PLLCON0_OD_MASK, 454 RK3066_PLLCON0_OD_SHIFT), 455 pll->reg_base + RK3066_PLLCON(0)); 456 457 writel_relaxed(HIWORD_UPDATE(rate->nf - 1, RK3066_PLLCON1_NF_MASK, 458 RK3066_PLLCON1_NF_SHIFT), 459 pll->reg_base + RK3066_PLLCON(1)); 460 writel_relaxed(HIWORD_UPDATE(rate->nb - 1, RK3066_PLLCON2_NB_MASK, 461 RK3066_PLLCON2_NB_SHIFT), 462 pll->reg_base + RK3066_PLLCON(2)); 463 464 /* leave reset and wait the reset_delay */ 465 writel(HIWORD_UPDATE(0, RK3066_PLLCON3_RESET, 0), 466 pll->reg_base + RK3066_PLLCON(3)); 467 udelay(RK3066_PLL_RESET_DELAY(rate->nr)); 468 469 /* wait for the pll to lock */ 470 ret = rockchip_pll_wait_lock(pll); 471 if (ret) { 472 pr_warn("%s: pll update unsuccessful, trying to restore old params\n", 473 __func__); 474 rockchip_rk3066_pll_set_params(pll, &cur); 475 } 476 477 if (rate_change_remuxed) 478 pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_NORM); 479 480 return ret; 481 } 482 483 static int rockchip_rk3066_pll_set_rate(struct clk_hw *hw, unsigned long drate, 484 unsigned long prate) 485 { 486 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 487 const struct rockchip_pll_rate_table *rate; 488 489 pr_debug("%s: changing %s to %lu with a parent rate of %lu\n", 490 __func__, clk_hw_get_name(hw), drate, prate); 491 492 /* Get required rate settings from table */ 493 rate = rockchip_get_pll_settings(pll, drate); 494 if (!rate) { 495 pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__, 496 drate, clk_hw_get_name(hw)); 497 return -EINVAL; 498 } 499 500 return rockchip_rk3066_pll_set_params(pll, rate); 501 } 502 503 static int rockchip_rk3066_pll_enable(struct clk_hw *hw) 504 { 505 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 506 507 writel(HIWORD_UPDATE(0, RK3066_PLLCON3_PWRDOWN, 0), 508 pll->reg_base + RK3066_PLLCON(3)); 509 rockchip_pll_wait_lock(pll); 510 511 return 0; 512 } 513 514 static void rockchip_rk3066_pll_disable(struct clk_hw *hw) 515 { 516 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 517 518 writel(HIWORD_UPDATE(RK3066_PLLCON3_PWRDOWN, 519 RK3066_PLLCON3_PWRDOWN, 0), 520 pll->reg_base + RK3066_PLLCON(3)); 521 } 522 523 static int rockchip_rk3066_pll_is_enabled(struct clk_hw *hw) 524 { 525 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 526 u32 pllcon = readl(pll->reg_base + RK3066_PLLCON(3)); 527 528 return !(pllcon & RK3066_PLLCON3_PWRDOWN); 529 } 530 531 static int rockchip_rk3066_pll_init(struct clk_hw *hw) 532 { 533 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 534 const struct rockchip_pll_rate_table *rate; 535 struct rockchip_pll_rate_table cur; 536 unsigned long drate; 537 538 if (!(pll->flags & ROCKCHIP_PLL_SYNC_RATE)) 539 return 0; 540 541 drate = clk_hw_get_rate(hw); 542 rate = rockchip_get_pll_settings(pll, drate); 543 544 /* when no rate setting for the current rate, rely on clk_set_rate */ 545 if (!rate) 546 return 0; 547 548 rockchip_rk3066_pll_get_params(pll, &cur); 549 550 pr_debug("%s: pll %s@%lu: nr (%d:%d); no (%d:%d); nf(%d:%d), nb(%d:%d)\n", 551 __func__, clk_hw_get_name(hw), drate, rate->nr, cur.nr, 552 rate->no, cur.no, rate->nf, cur.nf, rate->nb, cur.nb); 553 if (rate->nr != cur.nr || rate->no != cur.no || rate->nf != cur.nf 554 || rate->nb != cur.nb) { 555 pr_debug("%s: pll %s: rate params do not match rate table, adjusting\n", 556 __func__, clk_hw_get_name(hw)); 557 rockchip_rk3066_pll_set_params(pll, rate); 558 } 559 560 return 0; 561 } 562 563 static const struct clk_ops rockchip_rk3066_pll_clk_norate_ops = { 564 .recalc_rate = rockchip_rk3066_pll_recalc_rate, 565 .enable = rockchip_rk3066_pll_enable, 566 .disable = rockchip_rk3066_pll_disable, 567 .is_enabled = rockchip_rk3066_pll_is_enabled, 568 }; 569 570 static const struct clk_ops rockchip_rk3066_pll_clk_ops = { 571 .recalc_rate = rockchip_rk3066_pll_recalc_rate, 572 .round_rate = rockchip_pll_round_rate, 573 .set_rate = rockchip_rk3066_pll_set_rate, 574 .enable = rockchip_rk3066_pll_enable, 575 .disable = rockchip_rk3066_pll_disable, 576 .is_enabled = rockchip_rk3066_pll_is_enabled, 577 .init = rockchip_rk3066_pll_init, 578 }; 579 580 /* 581 * PLL used in RK3399 582 */ 583 584 #define RK3399_PLLCON(i) (i * 0x4) 585 #define RK3399_PLLCON0_FBDIV_MASK 0xfff 586 #define RK3399_PLLCON0_FBDIV_SHIFT 0 587 #define RK3399_PLLCON1_REFDIV_MASK 0x3f 588 #define RK3399_PLLCON1_REFDIV_SHIFT 0 589 #define RK3399_PLLCON1_POSTDIV1_MASK 0x7 590 #define RK3399_PLLCON1_POSTDIV1_SHIFT 8 591 #define RK3399_PLLCON1_POSTDIV2_MASK 0x7 592 #define RK3399_PLLCON1_POSTDIV2_SHIFT 12 593 #define RK3399_PLLCON2_FRAC_MASK 0xffffff 594 #define RK3399_PLLCON2_FRAC_SHIFT 0 595 #define RK3399_PLLCON2_LOCK_STATUS BIT(31) 596 #define RK3399_PLLCON3_PWRDOWN BIT(0) 597 #define RK3399_PLLCON3_DSMPD_MASK 0x1 598 #define RK3399_PLLCON3_DSMPD_SHIFT 3 599 600 static int rockchip_rk3399_pll_wait_lock(struct rockchip_clk_pll *pll) 601 { 602 u32 pllcon; 603 int ret; 604 605 /* 606 * Lock time typical 250, max 500 input clock cycles @24MHz 607 * So define a very safe maximum of 1000us, meaning 24000 cycles. 608 */ 609 ret = readl_relaxed_poll_timeout(pll->reg_base + RK3399_PLLCON(2), 610 pllcon, 611 pllcon & RK3399_PLLCON2_LOCK_STATUS, 612 0, 1000); 613 if (ret) 614 pr_err("%s: timeout waiting for pll to lock\n", __func__); 615 616 return ret; 617 } 618 619 static void rockchip_rk3399_pll_get_params(struct rockchip_clk_pll *pll, 620 struct rockchip_pll_rate_table *rate) 621 { 622 u32 pllcon; 623 624 pllcon = readl_relaxed(pll->reg_base + RK3399_PLLCON(0)); 625 rate->fbdiv = ((pllcon >> RK3399_PLLCON0_FBDIV_SHIFT) 626 & RK3399_PLLCON0_FBDIV_MASK); 627 628 pllcon = readl_relaxed(pll->reg_base + RK3399_PLLCON(1)); 629 rate->refdiv = ((pllcon >> RK3399_PLLCON1_REFDIV_SHIFT) 630 & RK3399_PLLCON1_REFDIV_MASK); 631 rate->postdiv1 = ((pllcon >> RK3399_PLLCON1_POSTDIV1_SHIFT) 632 & RK3399_PLLCON1_POSTDIV1_MASK); 633 rate->postdiv2 = ((pllcon >> RK3399_PLLCON1_POSTDIV2_SHIFT) 634 & RK3399_PLLCON1_POSTDIV2_MASK); 635 636 pllcon = readl_relaxed(pll->reg_base + RK3399_PLLCON(2)); 637 rate->frac = ((pllcon >> RK3399_PLLCON2_FRAC_SHIFT) 638 & RK3399_PLLCON2_FRAC_MASK); 639 640 pllcon = readl_relaxed(pll->reg_base + RK3399_PLLCON(3)); 641 rate->dsmpd = ((pllcon >> RK3399_PLLCON3_DSMPD_SHIFT) 642 & RK3399_PLLCON3_DSMPD_MASK); 643 } 644 645 static unsigned long rockchip_rk3399_pll_recalc_rate(struct clk_hw *hw, 646 unsigned long prate) 647 { 648 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 649 struct rockchip_pll_rate_table cur; 650 u64 rate64 = prate; 651 652 rockchip_rk3399_pll_get_params(pll, &cur); 653 654 rate64 *= cur.fbdiv; 655 do_div(rate64, cur.refdiv); 656 657 if (cur.dsmpd == 0) { 658 /* fractional mode */ 659 u64 frac_rate64 = prate * cur.frac; 660 661 do_div(frac_rate64, cur.refdiv); 662 rate64 += frac_rate64 >> 24; 663 } 664 665 do_div(rate64, cur.postdiv1); 666 do_div(rate64, cur.postdiv2); 667 668 return (unsigned long)rate64; 669 } 670 671 static int rockchip_rk3399_pll_set_params(struct rockchip_clk_pll *pll, 672 const struct rockchip_pll_rate_table *rate) 673 { 674 const struct clk_ops *pll_mux_ops = pll->pll_mux_ops; 675 struct clk_mux *pll_mux = &pll->pll_mux; 676 struct rockchip_pll_rate_table cur; 677 u32 pllcon; 678 int rate_change_remuxed = 0; 679 int cur_parent; 680 int ret; 681 682 pr_debug("%s: rate settings for %lu fbdiv: %d, postdiv1: %d, refdiv: %d, postdiv2: %d, dsmpd: %d, frac: %d\n", 683 __func__, rate->rate, rate->fbdiv, rate->postdiv1, rate->refdiv, 684 rate->postdiv2, rate->dsmpd, rate->frac); 685 686 rockchip_rk3399_pll_get_params(pll, &cur); 687 cur.rate = 0; 688 689 cur_parent = pll_mux_ops->get_parent(&pll_mux->hw); 690 if (cur_parent == PLL_MODE_NORM) { 691 pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_SLOW); 692 rate_change_remuxed = 1; 693 } 694 695 /* update pll values */ 696 writel_relaxed(HIWORD_UPDATE(rate->fbdiv, RK3399_PLLCON0_FBDIV_MASK, 697 RK3399_PLLCON0_FBDIV_SHIFT), 698 pll->reg_base + RK3399_PLLCON(0)); 699 700 writel_relaxed(HIWORD_UPDATE(rate->refdiv, RK3399_PLLCON1_REFDIV_MASK, 701 RK3399_PLLCON1_REFDIV_SHIFT) | 702 HIWORD_UPDATE(rate->postdiv1, RK3399_PLLCON1_POSTDIV1_MASK, 703 RK3399_PLLCON1_POSTDIV1_SHIFT) | 704 HIWORD_UPDATE(rate->postdiv2, RK3399_PLLCON1_POSTDIV2_MASK, 705 RK3399_PLLCON1_POSTDIV2_SHIFT), 706 pll->reg_base + RK3399_PLLCON(1)); 707 708 /* xPLL CON2 is not HIWORD_MASK */ 709 pllcon = readl_relaxed(pll->reg_base + RK3399_PLLCON(2)); 710 pllcon &= ~(RK3399_PLLCON2_FRAC_MASK << RK3399_PLLCON2_FRAC_SHIFT); 711 pllcon |= rate->frac << RK3399_PLLCON2_FRAC_SHIFT; 712 writel_relaxed(pllcon, pll->reg_base + RK3399_PLLCON(2)); 713 714 writel_relaxed(HIWORD_UPDATE(rate->dsmpd, RK3399_PLLCON3_DSMPD_MASK, 715 RK3399_PLLCON3_DSMPD_SHIFT), 716 pll->reg_base + RK3399_PLLCON(3)); 717 718 /* wait for the pll to lock */ 719 ret = rockchip_rk3399_pll_wait_lock(pll); 720 if (ret) { 721 pr_warn("%s: pll update unsuccessful, trying to restore old params\n", 722 __func__); 723 rockchip_rk3399_pll_set_params(pll, &cur); 724 } 725 726 if (rate_change_remuxed) 727 pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_NORM); 728 729 return ret; 730 } 731 732 static int rockchip_rk3399_pll_set_rate(struct clk_hw *hw, unsigned long drate, 733 unsigned long prate) 734 { 735 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 736 const struct rockchip_pll_rate_table *rate; 737 738 pr_debug("%s: changing %s to %lu with a parent rate of %lu\n", 739 __func__, __clk_get_name(hw->clk), drate, prate); 740 741 /* Get required rate settings from table */ 742 rate = rockchip_get_pll_settings(pll, drate); 743 if (!rate) { 744 pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__, 745 drate, __clk_get_name(hw->clk)); 746 return -EINVAL; 747 } 748 749 return rockchip_rk3399_pll_set_params(pll, rate); 750 } 751 752 static int rockchip_rk3399_pll_enable(struct clk_hw *hw) 753 { 754 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 755 756 writel(HIWORD_UPDATE(0, RK3399_PLLCON3_PWRDOWN, 0), 757 pll->reg_base + RK3399_PLLCON(3)); 758 rockchip_rk3399_pll_wait_lock(pll); 759 760 return 0; 761 } 762 763 static void rockchip_rk3399_pll_disable(struct clk_hw *hw) 764 { 765 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 766 767 writel(HIWORD_UPDATE(RK3399_PLLCON3_PWRDOWN, 768 RK3399_PLLCON3_PWRDOWN, 0), 769 pll->reg_base + RK3399_PLLCON(3)); 770 } 771 772 static int rockchip_rk3399_pll_is_enabled(struct clk_hw *hw) 773 { 774 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 775 u32 pllcon = readl(pll->reg_base + RK3399_PLLCON(3)); 776 777 return !(pllcon & RK3399_PLLCON3_PWRDOWN); 778 } 779 780 static int rockchip_rk3399_pll_init(struct clk_hw *hw) 781 { 782 struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); 783 const struct rockchip_pll_rate_table *rate; 784 struct rockchip_pll_rate_table cur; 785 unsigned long drate; 786 787 if (!(pll->flags & ROCKCHIP_PLL_SYNC_RATE)) 788 return 0; 789 790 drate = clk_hw_get_rate(hw); 791 rate = rockchip_get_pll_settings(pll, drate); 792 793 /* when no rate setting for the current rate, rely on clk_set_rate */ 794 if (!rate) 795 return 0; 796 797 rockchip_rk3399_pll_get_params(pll, &cur); 798 799 pr_debug("%s: pll %s@%lu: Hz\n", __func__, __clk_get_name(hw->clk), 800 drate); 801 pr_debug("old - fbdiv: %d, postdiv1: %d, refdiv: %d, postdiv2: %d, dsmpd: %d, frac: %d\n", 802 cur.fbdiv, cur.postdiv1, cur.refdiv, cur.postdiv2, 803 cur.dsmpd, cur.frac); 804 pr_debug("new - fbdiv: %d, postdiv1: %d, refdiv: %d, postdiv2: %d, dsmpd: %d, frac: %d\n", 805 rate->fbdiv, rate->postdiv1, rate->refdiv, rate->postdiv2, 806 rate->dsmpd, rate->frac); 807 808 if (rate->fbdiv != cur.fbdiv || rate->postdiv1 != cur.postdiv1 || 809 rate->refdiv != cur.refdiv || rate->postdiv2 != cur.postdiv2 || 810 rate->dsmpd != cur.dsmpd || 811 (!cur.dsmpd && (rate->frac != cur.frac))) { 812 struct clk *parent = clk_get_parent(hw->clk); 813 814 if (!parent) { 815 pr_warn("%s: parent of %s not available\n", 816 __func__, __clk_get_name(hw->clk)); 817 return 0; 818 } 819 820 pr_debug("%s: pll %s: rate params do not match rate table, adjusting\n", 821 __func__, __clk_get_name(hw->clk)); 822 rockchip_rk3399_pll_set_params(pll, rate); 823 } 824 825 return 0; 826 } 827 828 static const struct clk_ops rockchip_rk3399_pll_clk_norate_ops = { 829 .recalc_rate = rockchip_rk3399_pll_recalc_rate, 830 .enable = rockchip_rk3399_pll_enable, 831 .disable = rockchip_rk3399_pll_disable, 832 .is_enabled = rockchip_rk3399_pll_is_enabled, 833 }; 834 835 static const struct clk_ops rockchip_rk3399_pll_clk_ops = { 836 .recalc_rate = rockchip_rk3399_pll_recalc_rate, 837 .round_rate = rockchip_pll_round_rate, 838 .set_rate = rockchip_rk3399_pll_set_rate, 839 .enable = rockchip_rk3399_pll_enable, 840 .disable = rockchip_rk3399_pll_disable, 841 .is_enabled = rockchip_rk3399_pll_is_enabled, 842 .init = rockchip_rk3399_pll_init, 843 }; 844 845 /* 846 * Common registering of pll clocks 847 */ 848 849 struct clk *rockchip_clk_register_pll(struct rockchip_clk_provider *ctx, 850 enum rockchip_pll_type pll_type, 851 const char *name, const char *const *parent_names, 852 u8 num_parents, int con_offset, int grf_lock_offset, 853 int lock_shift, int mode_offset, int mode_shift, 854 struct rockchip_pll_rate_table *rate_table, 855 unsigned long flags, u8 clk_pll_flags) 856 { 857 const char *pll_parents[3]; 858 struct clk_init_data init; 859 struct rockchip_clk_pll *pll; 860 struct clk_mux *pll_mux; 861 struct clk *pll_clk, *mux_clk; 862 char pll_name[20]; 863 864 if ((pll_type != pll_rk3328 && num_parents != 2) || 865 (pll_type == pll_rk3328 && num_parents != 1)) { 866 pr_err("%s: needs two parent clocks\n", __func__); 867 return ERR_PTR(-EINVAL); 868 } 869 870 /* name the actual pll */ 871 snprintf(pll_name, sizeof(pll_name), "pll_%s", name); 872 873 pll = kzalloc(sizeof(*pll), GFP_KERNEL); 874 if (!pll) 875 return ERR_PTR(-ENOMEM); 876 877 /* create the mux on top of the real pll */ 878 pll->pll_mux_ops = &clk_mux_ops; 879 pll_mux = &pll->pll_mux; 880 pll_mux->reg = ctx->reg_base + mode_offset; 881 pll_mux->shift = mode_shift; 882 if (pll_type == pll_rk3328) 883 pll_mux->mask = PLL_RK3328_MODE_MASK; 884 else 885 pll_mux->mask = PLL_MODE_MASK; 886 pll_mux->flags = 0; 887 pll_mux->lock = &ctx->lock; 888 pll_mux->hw.init = &init; 889 890 if (pll_type == pll_rk3036 || 891 pll_type == pll_rk3066 || 892 pll_type == pll_rk3328 || 893 pll_type == pll_rk3399) 894 pll_mux->flags |= CLK_MUX_HIWORD_MASK; 895 896 /* the actual muxing is xin24m, pll-output, xin32k */ 897 pll_parents[0] = parent_names[0]; 898 pll_parents[1] = pll_name; 899 pll_parents[2] = parent_names[1]; 900 901 init.name = name; 902 init.flags = CLK_SET_RATE_PARENT; 903 init.ops = pll->pll_mux_ops; 904 init.parent_names = pll_parents; 905 if (pll_type == pll_rk3328) 906 init.num_parents = 2; 907 else 908 init.num_parents = ARRAY_SIZE(pll_parents); 909 910 mux_clk = clk_register(NULL, &pll_mux->hw); 911 if (IS_ERR(mux_clk)) 912 goto err_mux; 913 914 /* now create the actual pll */ 915 init.name = pll_name; 916 917 /* keep all plls untouched for now */ 918 init.flags = flags | CLK_IGNORE_UNUSED; 919 920 init.parent_names = &parent_names[0]; 921 init.num_parents = 1; 922 923 if (rate_table) { 924 int len; 925 926 /* find count of rates in rate_table */ 927 for (len = 0; rate_table[len].rate != 0; ) 928 len++; 929 930 pll->rate_count = len; 931 pll->rate_table = kmemdup(rate_table, 932 pll->rate_count * 933 sizeof(struct rockchip_pll_rate_table), 934 GFP_KERNEL); 935 WARN(!pll->rate_table, 936 "%s: could not allocate rate table for %s\n", 937 __func__, name); 938 } 939 940 switch (pll_type) { 941 case pll_rk3036: 942 case pll_rk3328: 943 if (!pll->rate_table) 944 init.ops = &rockchip_rk3036_pll_clk_norate_ops; 945 else 946 init.ops = &rockchip_rk3036_pll_clk_ops; 947 break; 948 case pll_rk3066: 949 if (!pll->rate_table || IS_ERR(ctx->grf)) 950 init.ops = &rockchip_rk3066_pll_clk_norate_ops; 951 else 952 init.ops = &rockchip_rk3066_pll_clk_ops; 953 break; 954 case pll_rk3399: 955 if (!pll->rate_table) 956 init.ops = &rockchip_rk3399_pll_clk_norate_ops; 957 else 958 init.ops = &rockchip_rk3399_pll_clk_ops; 959 break; 960 default: 961 pr_warn("%s: Unknown pll type for pll clk %s\n", 962 __func__, name); 963 } 964 965 pll->hw.init = &init; 966 pll->type = pll_type; 967 pll->reg_base = ctx->reg_base + con_offset; 968 pll->lock_offset = grf_lock_offset; 969 pll->lock_shift = lock_shift; 970 pll->flags = clk_pll_flags; 971 pll->lock = &ctx->lock; 972 pll->ctx = ctx; 973 974 pll_clk = clk_register(NULL, &pll->hw); 975 if (IS_ERR(pll_clk)) { 976 pr_err("%s: failed to register pll clock %s : %ld\n", 977 __func__, name, PTR_ERR(pll_clk)); 978 goto err_pll; 979 } 980 981 return mux_clk; 982 983 err_pll: 984 clk_unregister(mux_clk); 985 mux_clk = pll_clk; 986 err_mux: 987 kfree(pll); 988 return mux_clk; 989 } 990