1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * clk-si5351.c: Skyworks / Silicon Labs Si5351A/B/C I2C Clock Generator 4 * 5 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> 6 * Rabeeh Khoury <rabeeh@solid-run.com> 7 * 8 * References: 9 * [1] "Si5351A/B/C Data Sheet" 10 * https://www.skyworksinc.com/-/media/Skyworks/SL/documents/public/data-sheets/Si5351-B.pdf 11 * [2] "AN619: Manually Generating an Si5351 Register Map" 12 * https://www.skyworksinc.com/-/media/Skyworks/SL/documents/public/application-notes/AN619.pdf 13 */ 14 15 #include <linux/module.h> 16 #include <linux/kernel.h> 17 #include <linux/clk.h> 18 #include <linux/clk-provider.h> 19 #include <linux/delay.h> 20 #include <linux/err.h> 21 #include <linux/errno.h> 22 #include <linux/rational.h> 23 #include <linux/i2c.h> 24 #include <linux/of.h> 25 #include <linux/platform_data/si5351.h> 26 #include <linux/regmap.h> 27 #include <linux/slab.h> 28 #include <linux/string.h> 29 #include <asm/div64.h> 30 31 #include "clk-si5351.h" 32 33 struct si5351_driver_data; 34 35 struct si5351_parameters { 36 unsigned long p1; 37 unsigned long p2; 38 unsigned long p3; 39 int valid; 40 }; 41 42 struct si5351_hw_data { 43 struct clk_hw hw; 44 struct si5351_driver_data *drvdata; 45 struct si5351_parameters params; 46 unsigned char num; 47 }; 48 49 struct si5351_driver_data { 50 enum si5351_variant variant; 51 struct i2c_client *client; 52 struct regmap *regmap; 53 54 struct clk *pxtal; 55 const char *pxtal_name; 56 struct clk_hw xtal; 57 struct clk *pclkin; 58 const char *pclkin_name; 59 struct clk_hw clkin; 60 61 struct si5351_hw_data pll[2]; 62 struct si5351_hw_data *msynth; 63 struct si5351_hw_data *clkout; 64 size_t num_clkout; 65 }; 66 67 static const char * const si5351_input_names[] = { 68 "xtal", "clkin" 69 }; 70 static const char * const si5351_pll_names[] = { 71 "si5351_plla", "si5351_pllb", "si5351_vxco" 72 }; 73 static const char * const si5351_msynth_names[] = { 74 "ms0", "ms1", "ms2", "ms3", "ms4", "ms5", "ms6", "ms7" 75 }; 76 static const char * const si5351_clkout_names[] = { 77 "clk0", "clk1", "clk2", "clk3", "clk4", "clk5", "clk6", "clk7" 78 }; 79 80 /* 81 * Si5351 i2c regmap 82 */ 83 static inline u8 si5351_reg_read(struct si5351_driver_data *drvdata, u8 reg) 84 { 85 u32 val; 86 int ret; 87 88 ret = regmap_read(drvdata->regmap, reg, &val); 89 if (ret) { 90 dev_err(&drvdata->client->dev, 91 "unable to read from reg%02x\n", reg); 92 return 0; 93 } 94 95 return (u8)val; 96 } 97 98 static inline int si5351_bulk_read(struct si5351_driver_data *drvdata, 99 u8 reg, u8 count, u8 *buf) 100 { 101 return regmap_bulk_read(drvdata->regmap, reg, buf, count); 102 } 103 104 static inline int si5351_reg_write(struct si5351_driver_data *drvdata, 105 u8 reg, u8 val) 106 { 107 return regmap_write(drvdata->regmap, reg, val); 108 } 109 110 static inline int si5351_bulk_write(struct si5351_driver_data *drvdata, 111 u8 reg, u8 count, const u8 *buf) 112 { 113 return regmap_raw_write(drvdata->regmap, reg, buf, count); 114 } 115 116 static inline int si5351_set_bits(struct si5351_driver_data *drvdata, 117 u8 reg, u8 mask, u8 val) 118 { 119 return regmap_update_bits(drvdata->regmap, reg, mask, val); 120 } 121 122 static inline u8 si5351_msynth_params_address(int num) 123 { 124 if (num > 5) 125 return SI5351_CLK6_PARAMETERS + (num - 6); 126 return SI5351_CLK0_PARAMETERS + (SI5351_PARAMETERS_LENGTH * num); 127 } 128 129 static void si5351_read_parameters(struct si5351_driver_data *drvdata, 130 u8 reg, struct si5351_parameters *params) 131 { 132 u8 buf[SI5351_PARAMETERS_LENGTH]; 133 134 switch (reg) { 135 case SI5351_CLK6_PARAMETERS: 136 case SI5351_CLK7_PARAMETERS: 137 buf[0] = si5351_reg_read(drvdata, reg); 138 params->p1 = buf[0]; 139 params->p2 = 0; 140 params->p3 = 1; 141 break; 142 default: 143 si5351_bulk_read(drvdata, reg, SI5351_PARAMETERS_LENGTH, buf); 144 params->p1 = ((buf[2] & 0x03) << 16) | (buf[3] << 8) | buf[4]; 145 params->p2 = ((buf[5] & 0x0f) << 16) | (buf[6] << 8) | buf[7]; 146 params->p3 = ((buf[5] & 0xf0) << 12) | (buf[0] << 8) | buf[1]; 147 } 148 params->valid = 1; 149 } 150 151 static void si5351_write_parameters(struct si5351_driver_data *drvdata, 152 u8 reg, struct si5351_parameters *params) 153 { 154 u8 buf[SI5351_PARAMETERS_LENGTH]; 155 156 switch (reg) { 157 case SI5351_CLK6_PARAMETERS: 158 case SI5351_CLK7_PARAMETERS: 159 buf[0] = params->p1 & 0xff; 160 si5351_reg_write(drvdata, reg, buf[0]); 161 break; 162 default: 163 buf[0] = ((params->p3 & 0x0ff00) >> 8) & 0xff; 164 buf[1] = params->p3 & 0xff; 165 /* save rdiv and divby4 */ 166 buf[2] = si5351_reg_read(drvdata, reg + 2) & ~0x03; 167 buf[2] |= ((params->p1 & 0x30000) >> 16) & 0x03; 168 buf[3] = ((params->p1 & 0x0ff00) >> 8) & 0xff; 169 buf[4] = params->p1 & 0xff; 170 buf[5] = ((params->p3 & 0xf0000) >> 12) | 171 ((params->p2 & 0xf0000) >> 16); 172 buf[6] = ((params->p2 & 0x0ff00) >> 8) & 0xff; 173 buf[7] = params->p2 & 0xff; 174 si5351_bulk_write(drvdata, reg, SI5351_PARAMETERS_LENGTH, buf); 175 } 176 } 177 178 static bool si5351_regmap_is_volatile(struct device *dev, unsigned int reg) 179 { 180 switch (reg) { 181 case SI5351_DEVICE_STATUS: 182 case SI5351_INTERRUPT_STATUS: 183 case SI5351_PLL_RESET: 184 return true; 185 } 186 return false; 187 } 188 189 static bool si5351_regmap_is_writeable(struct device *dev, unsigned int reg) 190 { 191 /* reserved registers */ 192 if (reg >= 4 && reg <= 8) 193 return false; 194 if (reg >= 10 && reg <= 14) 195 return false; 196 if (reg >= 173 && reg <= 176) 197 return false; 198 if (reg >= 178 && reg <= 182) 199 return false; 200 /* read-only */ 201 if (reg == SI5351_DEVICE_STATUS) 202 return false; 203 return true; 204 } 205 206 static const struct regmap_config si5351_regmap_config = { 207 .reg_bits = 8, 208 .val_bits = 8, 209 .cache_type = REGCACHE_RBTREE, 210 .max_register = 187, 211 .writeable_reg = si5351_regmap_is_writeable, 212 .volatile_reg = si5351_regmap_is_volatile, 213 }; 214 215 /* 216 * Si5351 xtal clock input 217 */ 218 static int si5351_xtal_prepare(struct clk_hw *hw) 219 { 220 struct si5351_driver_data *drvdata = 221 container_of(hw, struct si5351_driver_data, xtal); 222 si5351_set_bits(drvdata, SI5351_FANOUT_ENABLE, 223 SI5351_XTAL_ENABLE, SI5351_XTAL_ENABLE); 224 return 0; 225 } 226 227 static void si5351_xtal_unprepare(struct clk_hw *hw) 228 { 229 struct si5351_driver_data *drvdata = 230 container_of(hw, struct si5351_driver_data, xtal); 231 si5351_set_bits(drvdata, SI5351_FANOUT_ENABLE, 232 SI5351_XTAL_ENABLE, 0); 233 } 234 235 static const struct clk_ops si5351_xtal_ops = { 236 .prepare = si5351_xtal_prepare, 237 .unprepare = si5351_xtal_unprepare, 238 }; 239 240 /* 241 * Si5351 clkin clock input (Si5351C only) 242 */ 243 static int si5351_clkin_prepare(struct clk_hw *hw) 244 { 245 struct si5351_driver_data *drvdata = 246 container_of(hw, struct si5351_driver_data, clkin); 247 si5351_set_bits(drvdata, SI5351_FANOUT_ENABLE, 248 SI5351_CLKIN_ENABLE, SI5351_CLKIN_ENABLE); 249 return 0; 250 } 251 252 static void si5351_clkin_unprepare(struct clk_hw *hw) 253 { 254 struct si5351_driver_data *drvdata = 255 container_of(hw, struct si5351_driver_data, clkin); 256 si5351_set_bits(drvdata, SI5351_FANOUT_ENABLE, 257 SI5351_CLKIN_ENABLE, 0); 258 } 259 260 /* 261 * CMOS clock source constraints: 262 * The input frequency range of the PLL is 10Mhz to 40MHz. 263 * If CLKIN is >40MHz, the input divider must be used. 264 */ 265 static unsigned long si5351_clkin_recalc_rate(struct clk_hw *hw, 266 unsigned long parent_rate) 267 { 268 struct si5351_driver_data *drvdata = 269 container_of(hw, struct si5351_driver_data, clkin); 270 unsigned long rate; 271 unsigned char idiv; 272 273 rate = parent_rate; 274 if (parent_rate > 160000000) { 275 idiv = SI5351_CLKIN_DIV_8; 276 rate /= 8; 277 } else if (parent_rate > 80000000) { 278 idiv = SI5351_CLKIN_DIV_4; 279 rate /= 4; 280 } else if (parent_rate > 40000000) { 281 idiv = SI5351_CLKIN_DIV_2; 282 rate /= 2; 283 } else { 284 idiv = SI5351_CLKIN_DIV_1; 285 } 286 287 si5351_set_bits(drvdata, SI5351_PLL_INPUT_SOURCE, 288 SI5351_CLKIN_DIV_MASK, idiv); 289 290 dev_dbg(&drvdata->client->dev, "%s - clkin div = %d, rate = %lu\n", 291 __func__, (1 << (idiv >> 6)), rate); 292 293 return rate; 294 } 295 296 static const struct clk_ops si5351_clkin_ops = { 297 .prepare = si5351_clkin_prepare, 298 .unprepare = si5351_clkin_unprepare, 299 .recalc_rate = si5351_clkin_recalc_rate, 300 }; 301 302 /* 303 * Si5351 vxco clock input (Si5351B only) 304 */ 305 306 static int si5351_vxco_prepare(struct clk_hw *hw) 307 { 308 struct si5351_hw_data *hwdata = 309 container_of(hw, struct si5351_hw_data, hw); 310 311 dev_warn(&hwdata->drvdata->client->dev, "VXCO currently unsupported\n"); 312 313 return 0; 314 } 315 316 static void si5351_vxco_unprepare(struct clk_hw *hw) 317 { 318 } 319 320 static unsigned long si5351_vxco_recalc_rate(struct clk_hw *hw, 321 unsigned long parent_rate) 322 { 323 return 0; 324 } 325 326 static int si5351_vxco_set_rate(struct clk_hw *hw, unsigned long rate, 327 unsigned long parent) 328 { 329 return 0; 330 } 331 332 static const struct clk_ops si5351_vxco_ops = { 333 .prepare = si5351_vxco_prepare, 334 .unprepare = si5351_vxco_unprepare, 335 .recalc_rate = si5351_vxco_recalc_rate, 336 .set_rate = si5351_vxco_set_rate, 337 }; 338 339 /* 340 * Si5351 pll a/b 341 * 342 * Feedback Multisynth Divider Equations [2] 343 * 344 * fVCO = fIN * (a + b/c) 345 * 346 * with 15 + 0/1048575 <= (a + b/c) <= 90 + 0/1048575 and 347 * fIN = fXTAL or fIN = fCLKIN/CLKIN_DIV 348 * 349 * Feedback Multisynth Register Equations 350 * 351 * (1) MSNx_P1[17:0] = 128 * a + floor(128 * b/c) - 512 352 * (2) MSNx_P2[19:0] = 128 * b - c * floor(128 * b/c) = (128*b) mod c 353 * (3) MSNx_P3[19:0] = c 354 * 355 * Transposing (2) yields: (4) floor(128 * b/c) = (128 * b / MSNx_P2)/c 356 * 357 * Using (4) on (1) yields: 358 * MSNx_P1 = 128 * a + (128 * b/MSNx_P2)/c - 512 359 * MSNx_P1 + 512 + MSNx_P2/c = 128 * a + 128 * b/c 360 * 361 * a + b/c = (MSNx_P1 + MSNx_P2/MSNx_P3 + 512)/128 362 * = (MSNx_P1*MSNx_P3 + MSNx_P2 + 512*MSNx_P3)/(128*MSNx_P3) 363 * 364 */ 365 static int _si5351_pll_reparent(struct si5351_driver_data *drvdata, 366 int num, enum si5351_pll_src parent) 367 { 368 u8 mask = (num == 0) ? SI5351_PLLA_SOURCE : SI5351_PLLB_SOURCE; 369 370 if (parent == SI5351_PLL_SRC_DEFAULT) 371 return 0; 372 373 if (num > 2) 374 return -EINVAL; 375 376 if (drvdata->variant != SI5351_VARIANT_C && 377 parent != SI5351_PLL_SRC_XTAL) 378 return -EINVAL; 379 380 si5351_set_bits(drvdata, SI5351_PLL_INPUT_SOURCE, mask, 381 (parent == SI5351_PLL_SRC_XTAL) ? 0 : mask); 382 return 0; 383 } 384 385 static unsigned char si5351_pll_get_parent(struct clk_hw *hw) 386 { 387 struct si5351_hw_data *hwdata = 388 container_of(hw, struct si5351_hw_data, hw); 389 u8 mask = (hwdata->num == 0) ? SI5351_PLLA_SOURCE : SI5351_PLLB_SOURCE; 390 u8 val; 391 392 val = si5351_reg_read(hwdata->drvdata, SI5351_PLL_INPUT_SOURCE); 393 394 return (val & mask) ? 1 : 0; 395 } 396 397 static int si5351_pll_set_parent(struct clk_hw *hw, u8 index) 398 { 399 struct si5351_hw_data *hwdata = 400 container_of(hw, struct si5351_hw_data, hw); 401 402 if (hwdata->drvdata->variant != SI5351_VARIANT_C && 403 index > 0) 404 return -EPERM; 405 406 if (index > 1) 407 return -EINVAL; 408 409 return _si5351_pll_reparent(hwdata->drvdata, hwdata->num, 410 (index == 0) ? SI5351_PLL_SRC_XTAL : 411 SI5351_PLL_SRC_CLKIN); 412 } 413 414 static unsigned long si5351_pll_recalc_rate(struct clk_hw *hw, 415 unsigned long parent_rate) 416 { 417 struct si5351_hw_data *hwdata = 418 container_of(hw, struct si5351_hw_data, hw); 419 u8 reg = (hwdata->num == 0) ? SI5351_PLLA_PARAMETERS : 420 SI5351_PLLB_PARAMETERS; 421 unsigned long long rate; 422 423 if (!hwdata->params.valid) 424 si5351_read_parameters(hwdata->drvdata, reg, &hwdata->params); 425 426 if (hwdata->params.p3 == 0) 427 return parent_rate; 428 429 /* fVCO = fIN * (P1*P3 + 512*P3 + P2)/(128*P3) */ 430 rate = hwdata->params.p1 * hwdata->params.p3; 431 rate += 512 * hwdata->params.p3; 432 rate += hwdata->params.p2; 433 rate *= parent_rate; 434 do_div(rate, 128 * hwdata->params.p3); 435 436 dev_dbg(&hwdata->drvdata->client->dev, 437 "%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, parent_rate = %lu, rate = %lu\n", 438 __func__, clk_hw_get_name(hw), 439 hwdata->params.p1, hwdata->params.p2, hwdata->params.p3, 440 parent_rate, (unsigned long)rate); 441 442 return (unsigned long)rate; 443 } 444 445 static int si5351_pll_determine_rate(struct clk_hw *hw, 446 struct clk_rate_request *req) 447 { 448 struct si5351_hw_data *hwdata = 449 container_of(hw, struct si5351_hw_data, hw); 450 unsigned long rate = req->rate; 451 unsigned long rfrac, denom, a, b, c; 452 unsigned long long lltmp; 453 454 if (rate < SI5351_PLL_VCO_MIN) 455 rate = SI5351_PLL_VCO_MIN; 456 if (rate > SI5351_PLL_VCO_MAX) 457 rate = SI5351_PLL_VCO_MAX; 458 459 /* determine integer part of feedback equation */ 460 a = rate / req->best_parent_rate; 461 462 if (a < SI5351_PLL_A_MIN) 463 rate = req->best_parent_rate * SI5351_PLL_A_MIN; 464 if (a > SI5351_PLL_A_MAX) 465 rate = req->best_parent_rate * SI5351_PLL_A_MAX; 466 467 /* find best approximation for b/c = fVCO mod fIN */ 468 denom = 1000 * 1000; 469 lltmp = rate % (req->best_parent_rate); 470 lltmp *= denom; 471 do_div(lltmp, req->best_parent_rate); 472 rfrac = (unsigned long)lltmp; 473 474 b = 0; 475 c = 1; 476 if (rfrac) 477 rational_best_approximation(rfrac, denom, 478 SI5351_PLL_B_MAX, SI5351_PLL_C_MAX, &b, &c); 479 480 /* calculate parameters */ 481 hwdata->params.p3 = c; 482 hwdata->params.p2 = (128 * b) % c; 483 hwdata->params.p1 = 128 * a; 484 hwdata->params.p1 += (128 * b / c); 485 hwdata->params.p1 -= 512; 486 487 /* recalculate rate by fIN * (a + b/c) */ 488 lltmp = req->best_parent_rate; 489 lltmp *= b; 490 do_div(lltmp, c); 491 492 rate = (unsigned long)lltmp; 493 rate += req->best_parent_rate * a; 494 495 dev_dbg(&hwdata->drvdata->client->dev, 496 "%s - %s: a = %lu, b = %lu, c = %lu, parent_rate = %lu, rate = %lu\n", 497 __func__, clk_hw_get_name(hw), a, b, c, 498 req->best_parent_rate, rate); 499 500 req->rate = rate; 501 return 0; 502 } 503 504 static int si5351_pll_set_rate(struct clk_hw *hw, unsigned long rate, 505 unsigned long parent_rate) 506 { 507 struct si5351_hw_data *hwdata = 508 container_of(hw, struct si5351_hw_data, hw); 509 u8 reg = (hwdata->num == 0) ? SI5351_PLLA_PARAMETERS : 510 SI5351_PLLB_PARAMETERS; 511 512 /* write multisynth parameters */ 513 si5351_write_parameters(hwdata->drvdata, reg, &hwdata->params); 514 515 /* plla/pllb ctrl is in clk6/clk7 ctrl registers */ 516 si5351_set_bits(hwdata->drvdata, SI5351_CLK6_CTRL + hwdata->num, 517 SI5351_CLK_INTEGER_MODE, 518 (hwdata->params.p2 == 0) ? SI5351_CLK_INTEGER_MODE : 0); 519 520 /* Do a pll soft reset on the affected pll */ 521 si5351_reg_write(hwdata->drvdata, SI5351_PLL_RESET, 522 hwdata->num == 0 ? SI5351_PLL_RESET_A : 523 SI5351_PLL_RESET_B); 524 525 dev_dbg(&hwdata->drvdata->client->dev, 526 "%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, parent_rate = %lu, rate = %lu\n", 527 __func__, clk_hw_get_name(hw), 528 hwdata->params.p1, hwdata->params.p2, hwdata->params.p3, 529 parent_rate, rate); 530 531 return 0; 532 } 533 534 static const struct clk_ops si5351_pll_ops = { 535 .set_parent = si5351_pll_set_parent, 536 .get_parent = si5351_pll_get_parent, 537 .recalc_rate = si5351_pll_recalc_rate, 538 .determine_rate = si5351_pll_determine_rate, 539 .set_rate = si5351_pll_set_rate, 540 }; 541 542 /* 543 * Si5351 multisync divider 544 * 545 * for fOUT <= 150 MHz: 546 * 547 * fOUT = (fIN * (a + b/c)) / CLKOUTDIV 548 * 549 * with 6 + 0/1048575 <= (a + b/c) <= 1800 + 0/1048575 and 550 * fIN = fVCO0, fVCO1 551 * 552 * Output Clock Multisynth Register Equations 553 * 554 * MSx_P1[17:0] = 128 * a + floor(128 * b/c) - 512 555 * MSx_P2[19:0] = 128 * b - c * floor(128 * b/c) = (128*b) mod c 556 * MSx_P3[19:0] = c 557 * 558 * MS[6,7] are integer (P1) divide only, P1 = divide value, 559 * P2 and P3 are not applicable 560 * 561 * for 150MHz < fOUT <= 160MHz: 562 * 563 * MSx_P1 = 0, MSx_P2 = 0, MSx_P3 = 1, MSx_INT = 1, MSx_DIVBY4 = 11b 564 */ 565 static int _si5351_msynth_reparent(struct si5351_driver_data *drvdata, 566 int num, enum si5351_multisynth_src parent) 567 { 568 if (parent == SI5351_MULTISYNTH_SRC_DEFAULT) 569 return 0; 570 571 if (num > 8) 572 return -EINVAL; 573 574 si5351_set_bits(drvdata, SI5351_CLK0_CTRL + num, SI5351_CLK_PLL_SELECT, 575 (parent == SI5351_MULTISYNTH_SRC_VCO0) ? 0 : 576 SI5351_CLK_PLL_SELECT); 577 return 0; 578 } 579 580 static unsigned char si5351_msynth_get_parent(struct clk_hw *hw) 581 { 582 struct si5351_hw_data *hwdata = 583 container_of(hw, struct si5351_hw_data, hw); 584 u8 val; 585 586 val = si5351_reg_read(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num); 587 588 return (val & SI5351_CLK_PLL_SELECT) ? 1 : 0; 589 } 590 591 static int si5351_msynth_set_parent(struct clk_hw *hw, u8 index) 592 { 593 struct si5351_hw_data *hwdata = 594 container_of(hw, struct si5351_hw_data, hw); 595 596 return _si5351_msynth_reparent(hwdata->drvdata, hwdata->num, 597 (index == 0) ? SI5351_MULTISYNTH_SRC_VCO0 : 598 SI5351_MULTISYNTH_SRC_VCO1); 599 } 600 601 static unsigned long si5351_msynth_recalc_rate(struct clk_hw *hw, 602 unsigned long parent_rate) 603 { 604 struct si5351_hw_data *hwdata = 605 container_of(hw, struct si5351_hw_data, hw); 606 u8 reg = si5351_msynth_params_address(hwdata->num); 607 unsigned long long rate; 608 unsigned long m; 609 610 if (!hwdata->params.valid) 611 si5351_read_parameters(hwdata->drvdata, reg, &hwdata->params); 612 613 /* 614 * multisync0-5: fOUT = (128 * P3 * fIN) / (P1*P3 + P2 + 512*P3) 615 * multisync6-7: fOUT = fIN / P1 616 */ 617 rate = parent_rate; 618 if (hwdata->num > 5) { 619 m = hwdata->params.p1; 620 } else if (hwdata->params.p3 == 0) { 621 return parent_rate; 622 } else if ((si5351_reg_read(hwdata->drvdata, reg + 2) & 623 SI5351_OUTPUT_CLK_DIVBY4) == SI5351_OUTPUT_CLK_DIVBY4) { 624 m = 4; 625 } else { 626 rate *= 128 * hwdata->params.p3; 627 m = hwdata->params.p1 * hwdata->params.p3; 628 m += hwdata->params.p2; 629 m += 512 * hwdata->params.p3; 630 } 631 632 if (m == 0) 633 return 0; 634 do_div(rate, m); 635 636 dev_dbg(&hwdata->drvdata->client->dev, 637 "%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, m = %lu, parent_rate = %lu, rate = %lu\n", 638 __func__, clk_hw_get_name(hw), 639 hwdata->params.p1, hwdata->params.p2, hwdata->params.p3, 640 m, parent_rate, (unsigned long)rate); 641 642 return (unsigned long)rate; 643 } 644 645 static int si5351_msynth_determine_rate(struct clk_hw *hw, 646 struct clk_rate_request *req) 647 { 648 struct si5351_hw_data *hwdata = 649 container_of(hw, struct si5351_hw_data, hw); 650 unsigned long rate = req->rate; 651 unsigned long long lltmp; 652 unsigned long a, b, c; 653 int divby4; 654 655 /* multisync6-7 can only handle freqencies < 150MHz */ 656 if (hwdata->num >= 6 && rate > SI5351_MULTISYNTH67_MAX_FREQ) 657 rate = SI5351_MULTISYNTH67_MAX_FREQ; 658 659 /* multisync frequency is 1MHz .. 160MHz */ 660 if (rate > SI5351_MULTISYNTH_MAX_FREQ) 661 rate = SI5351_MULTISYNTH_MAX_FREQ; 662 if (rate < SI5351_MULTISYNTH_MIN_FREQ) 663 rate = SI5351_MULTISYNTH_MIN_FREQ; 664 665 divby4 = 0; 666 if (rate > SI5351_MULTISYNTH_DIVBY4_FREQ) 667 divby4 = 1; 668 669 /* multisync can set pll */ 670 if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) { 671 /* 672 * find largest integer divider for max 673 * vco frequency and given target rate 674 */ 675 if (divby4 == 0) { 676 lltmp = SI5351_PLL_VCO_MAX; 677 do_div(lltmp, rate); 678 a = (unsigned long)lltmp; 679 } else 680 a = 4; 681 682 b = 0; 683 c = 1; 684 685 req->best_parent_rate = a * rate; 686 } else if (hwdata->num >= 6) { 687 /* determine the closest integer divider */ 688 a = DIV_ROUND_CLOSEST(req->best_parent_rate, rate); 689 if (a < SI5351_MULTISYNTH_A_MIN) 690 a = SI5351_MULTISYNTH_A_MIN; 691 if (a > SI5351_MULTISYNTH67_A_MAX) 692 a = SI5351_MULTISYNTH67_A_MAX; 693 694 b = 0; 695 c = 1; 696 } else { 697 unsigned long rfrac, denom; 698 699 /* disable divby4 */ 700 if (divby4) { 701 rate = SI5351_MULTISYNTH_DIVBY4_FREQ; 702 divby4 = 0; 703 } 704 705 /* determine integer part of divider equation */ 706 a = req->best_parent_rate / rate; 707 if (a < SI5351_MULTISYNTH_A_MIN) 708 a = SI5351_MULTISYNTH_A_MIN; 709 if (a > SI5351_MULTISYNTH_A_MAX) 710 a = SI5351_MULTISYNTH_A_MAX; 711 712 /* find best approximation for b/c = fVCO mod fOUT */ 713 denom = 1000 * 1000; 714 lltmp = req->best_parent_rate % rate; 715 lltmp *= denom; 716 do_div(lltmp, rate); 717 rfrac = (unsigned long)lltmp; 718 719 b = 0; 720 c = 1; 721 if (rfrac) 722 rational_best_approximation(rfrac, denom, 723 SI5351_MULTISYNTH_B_MAX, SI5351_MULTISYNTH_C_MAX, 724 &b, &c); 725 } 726 727 /* recalculate rate by fOUT = fIN / (a + b/c) */ 728 lltmp = req->best_parent_rate; 729 lltmp *= c; 730 do_div(lltmp, a * c + b); 731 rate = (unsigned long)lltmp; 732 733 /* calculate parameters */ 734 if (divby4) { 735 hwdata->params.p3 = 1; 736 hwdata->params.p2 = 0; 737 hwdata->params.p1 = 0; 738 } else if (hwdata->num >= 6) { 739 hwdata->params.p3 = 0; 740 hwdata->params.p2 = 0; 741 hwdata->params.p1 = a; 742 } else { 743 hwdata->params.p3 = c; 744 hwdata->params.p2 = (128 * b) % c; 745 hwdata->params.p1 = 128 * a; 746 hwdata->params.p1 += (128 * b / c); 747 hwdata->params.p1 -= 512; 748 } 749 750 dev_dbg(&hwdata->drvdata->client->dev, 751 "%s - %s: a = %lu, b = %lu, c = %lu, divby4 = %d, parent_rate = %lu, rate = %lu\n", 752 __func__, clk_hw_get_name(hw), a, b, c, divby4, 753 req->best_parent_rate, rate); 754 755 req->rate = rate; 756 757 return 0; 758 } 759 760 static int si5351_msynth_set_rate(struct clk_hw *hw, unsigned long rate, 761 unsigned long parent_rate) 762 { 763 struct si5351_hw_data *hwdata = 764 container_of(hw, struct si5351_hw_data, hw); 765 u8 reg = si5351_msynth_params_address(hwdata->num); 766 int divby4 = 0; 767 768 /* write multisynth parameters */ 769 si5351_write_parameters(hwdata->drvdata, reg, &hwdata->params); 770 771 if (rate > SI5351_MULTISYNTH_DIVBY4_FREQ) 772 divby4 = 1; 773 774 /* enable/disable integer mode and divby4 on multisynth0-5 */ 775 if (hwdata->num < 6) { 776 si5351_set_bits(hwdata->drvdata, reg + 2, 777 SI5351_OUTPUT_CLK_DIVBY4, 778 (divby4) ? SI5351_OUTPUT_CLK_DIVBY4 : 0); 779 si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num, 780 SI5351_CLK_INTEGER_MODE, 781 (hwdata->params.p2 == 0) ? SI5351_CLK_INTEGER_MODE : 0); 782 } 783 784 dev_dbg(&hwdata->drvdata->client->dev, 785 "%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, divby4 = %d, parent_rate = %lu, rate = %lu\n", 786 __func__, clk_hw_get_name(hw), 787 hwdata->params.p1, hwdata->params.p2, hwdata->params.p3, 788 divby4, parent_rate, rate); 789 790 return 0; 791 } 792 793 static const struct clk_ops si5351_msynth_ops = { 794 .set_parent = si5351_msynth_set_parent, 795 .get_parent = si5351_msynth_get_parent, 796 .recalc_rate = si5351_msynth_recalc_rate, 797 .determine_rate = si5351_msynth_determine_rate, 798 .set_rate = si5351_msynth_set_rate, 799 }; 800 801 /* 802 * Si5351 clkout divider 803 */ 804 static int _si5351_clkout_reparent(struct si5351_driver_data *drvdata, 805 int num, enum si5351_clkout_src parent) 806 { 807 u8 val; 808 809 if (num > 8) 810 return -EINVAL; 811 812 switch (parent) { 813 case SI5351_CLKOUT_SRC_MSYNTH_N: 814 val = SI5351_CLK_INPUT_MULTISYNTH_N; 815 break; 816 case SI5351_CLKOUT_SRC_MSYNTH_0_4: 817 /* clk0/clk4 can only connect to its own multisync */ 818 if (num == 0 || num == 4) 819 val = SI5351_CLK_INPUT_MULTISYNTH_N; 820 else 821 val = SI5351_CLK_INPUT_MULTISYNTH_0_4; 822 break; 823 case SI5351_CLKOUT_SRC_XTAL: 824 val = SI5351_CLK_INPUT_XTAL; 825 break; 826 case SI5351_CLKOUT_SRC_CLKIN: 827 if (drvdata->variant != SI5351_VARIANT_C) 828 return -EINVAL; 829 830 val = SI5351_CLK_INPUT_CLKIN; 831 break; 832 default: 833 return 0; 834 } 835 836 si5351_set_bits(drvdata, SI5351_CLK0_CTRL + num, 837 SI5351_CLK_INPUT_MASK, val); 838 return 0; 839 } 840 841 static int _si5351_clkout_set_drive_strength( 842 struct si5351_driver_data *drvdata, int num, 843 enum si5351_drive_strength drive) 844 { 845 u8 mask; 846 847 if (num > 8) 848 return -EINVAL; 849 850 switch (drive) { 851 case SI5351_DRIVE_2MA: 852 mask = SI5351_CLK_DRIVE_STRENGTH_2MA; 853 break; 854 case SI5351_DRIVE_4MA: 855 mask = SI5351_CLK_DRIVE_STRENGTH_4MA; 856 break; 857 case SI5351_DRIVE_6MA: 858 mask = SI5351_CLK_DRIVE_STRENGTH_6MA; 859 break; 860 case SI5351_DRIVE_8MA: 861 mask = SI5351_CLK_DRIVE_STRENGTH_8MA; 862 break; 863 default: 864 return 0; 865 } 866 867 si5351_set_bits(drvdata, SI5351_CLK0_CTRL + num, 868 SI5351_CLK_DRIVE_STRENGTH_MASK, mask); 869 return 0; 870 } 871 872 static int _si5351_clkout_set_disable_state( 873 struct si5351_driver_data *drvdata, int num, 874 enum si5351_disable_state state) 875 { 876 u8 reg = (num < 4) ? SI5351_CLK3_0_DISABLE_STATE : 877 SI5351_CLK7_4_DISABLE_STATE; 878 u8 shift = (num < 4) ? (2 * num) : (2 * (num-4)); 879 u8 mask = SI5351_CLK_DISABLE_STATE_MASK << shift; 880 u8 val; 881 882 if (num > 8) 883 return -EINVAL; 884 885 switch (state) { 886 case SI5351_DISABLE_LOW: 887 val = SI5351_CLK_DISABLE_STATE_LOW; 888 break; 889 case SI5351_DISABLE_HIGH: 890 val = SI5351_CLK_DISABLE_STATE_HIGH; 891 break; 892 case SI5351_DISABLE_FLOATING: 893 val = SI5351_CLK_DISABLE_STATE_FLOAT; 894 break; 895 case SI5351_DISABLE_NEVER: 896 val = SI5351_CLK_DISABLE_STATE_NEVER; 897 break; 898 default: 899 return 0; 900 } 901 902 si5351_set_bits(drvdata, reg, mask, val << shift); 903 904 return 0; 905 } 906 907 static void _si5351_clkout_reset_pll(struct si5351_driver_data *drvdata, int num) 908 { 909 u8 val = si5351_reg_read(drvdata, SI5351_CLK0_CTRL + num); 910 u8 mask = val & SI5351_CLK_PLL_SELECT ? SI5351_PLL_RESET_B : 911 SI5351_PLL_RESET_A; 912 unsigned int v; 913 int err; 914 915 switch (val & SI5351_CLK_INPUT_MASK) { 916 case SI5351_CLK_INPUT_XTAL: 917 case SI5351_CLK_INPUT_CLKIN: 918 return; /* pll not used, no need to reset */ 919 } 920 921 si5351_reg_write(drvdata, SI5351_PLL_RESET, mask); 922 923 err = regmap_read_poll_timeout(drvdata->regmap, SI5351_PLL_RESET, v, 924 !(v & mask), 0, 20000); 925 if (err < 0) 926 dev_err(&drvdata->client->dev, "Reset bit didn't clear\n"); 927 928 dev_dbg(&drvdata->client->dev, "%s - %s: pll = %d\n", 929 __func__, clk_hw_get_name(&drvdata->clkout[num].hw), 930 (val & SI5351_CLK_PLL_SELECT) ? 1 : 0); 931 } 932 933 static int si5351_clkout_prepare(struct clk_hw *hw) 934 { 935 struct si5351_hw_data *hwdata = 936 container_of(hw, struct si5351_hw_data, hw); 937 struct si5351_platform_data *pdata = 938 hwdata->drvdata->client->dev.platform_data; 939 940 si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num, 941 SI5351_CLK_POWERDOWN, 0); 942 943 /* 944 * Do a pll soft reset on the parent pll -- needed to get a 945 * deterministic phase relationship between the output clocks. 946 */ 947 if (pdata->clkout[hwdata->num].pll_reset) 948 _si5351_clkout_reset_pll(hwdata->drvdata, hwdata->num); 949 950 si5351_set_bits(hwdata->drvdata, SI5351_OUTPUT_ENABLE_CTRL, 951 (1 << hwdata->num), 0); 952 return 0; 953 } 954 955 static void si5351_clkout_unprepare(struct clk_hw *hw) 956 { 957 struct si5351_hw_data *hwdata = 958 container_of(hw, struct si5351_hw_data, hw); 959 960 si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num, 961 SI5351_CLK_POWERDOWN, SI5351_CLK_POWERDOWN); 962 si5351_set_bits(hwdata->drvdata, SI5351_OUTPUT_ENABLE_CTRL, 963 (1 << hwdata->num), (1 << hwdata->num)); 964 } 965 966 static u8 si5351_clkout_get_parent(struct clk_hw *hw) 967 { 968 struct si5351_hw_data *hwdata = 969 container_of(hw, struct si5351_hw_data, hw); 970 int index = 0; 971 unsigned char val; 972 973 val = si5351_reg_read(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num); 974 switch (val & SI5351_CLK_INPUT_MASK) { 975 case SI5351_CLK_INPUT_MULTISYNTH_N: 976 index = 0; 977 break; 978 case SI5351_CLK_INPUT_MULTISYNTH_0_4: 979 index = 1; 980 break; 981 case SI5351_CLK_INPUT_XTAL: 982 index = 2; 983 break; 984 case SI5351_CLK_INPUT_CLKIN: 985 index = 3; 986 break; 987 } 988 989 return index; 990 } 991 992 static int si5351_clkout_set_parent(struct clk_hw *hw, u8 index) 993 { 994 struct si5351_hw_data *hwdata = 995 container_of(hw, struct si5351_hw_data, hw); 996 enum si5351_clkout_src parent = SI5351_CLKOUT_SRC_DEFAULT; 997 998 switch (index) { 999 case 0: 1000 parent = SI5351_CLKOUT_SRC_MSYNTH_N; 1001 break; 1002 case 1: 1003 parent = SI5351_CLKOUT_SRC_MSYNTH_0_4; 1004 break; 1005 case 2: 1006 parent = SI5351_CLKOUT_SRC_XTAL; 1007 break; 1008 case 3: 1009 parent = SI5351_CLKOUT_SRC_CLKIN; 1010 break; 1011 } 1012 1013 return _si5351_clkout_reparent(hwdata->drvdata, hwdata->num, parent); 1014 } 1015 1016 static unsigned long si5351_clkout_recalc_rate(struct clk_hw *hw, 1017 unsigned long parent_rate) 1018 { 1019 struct si5351_hw_data *hwdata = 1020 container_of(hw, struct si5351_hw_data, hw); 1021 unsigned char reg; 1022 unsigned char rdiv; 1023 1024 if (hwdata->num <= 5) 1025 reg = si5351_msynth_params_address(hwdata->num) + 2; 1026 else 1027 reg = SI5351_CLK6_7_OUTPUT_DIVIDER; 1028 1029 rdiv = si5351_reg_read(hwdata->drvdata, reg); 1030 if (hwdata->num == 6) { 1031 rdiv &= SI5351_OUTPUT_CLK6_DIV_MASK; 1032 } else { 1033 rdiv &= SI5351_OUTPUT_CLK_DIV_MASK; 1034 rdiv >>= SI5351_OUTPUT_CLK_DIV_SHIFT; 1035 } 1036 1037 return parent_rate >> rdiv; 1038 } 1039 1040 static int si5351_clkout_determine_rate(struct clk_hw *hw, 1041 struct clk_rate_request *req) 1042 { 1043 struct si5351_hw_data *hwdata = 1044 container_of(hw, struct si5351_hw_data, hw); 1045 unsigned long rate = req->rate; 1046 unsigned char rdiv; 1047 1048 /* clkout6/7 can only handle output freqencies < 150MHz */ 1049 if (hwdata->num >= 6 && rate > SI5351_CLKOUT67_MAX_FREQ) 1050 rate = SI5351_CLKOUT67_MAX_FREQ; 1051 1052 /* clkout freqency is 8kHz - 160MHz */ 1053 if (rate > SI5351_CLKOUT_MAX_FREQ) 1054 rate = SI5351_CLKOUT_MAX_FREQ; 1055 if (rate < SI5351_CLKOUT_MIN_FREQ) 1056 rate = SI5351_CLKOUT_MIN_FREQ; 1057 1058 /* request frequency if multisync master */ 1059 if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) { 1060 /* use r divider for frequencies below 1MHz */ 1061 rdiv = SI5351_OUTPUT_CLK_DIV_1; 1062 while (rate < SI5351_MULTISYNTH_MIN_FREQ && 1063 rdiv < SI5351_OUTPUT_CLK_DIV_128) { 1064 rdiv += 1; 1065 rate *= 2; 1066 } 1067 req->best_parent_rate = rate; 1068 } else { 1069 unsigned long new_rate, new_err, err; 1070 1071 /* round to closed rdiv */ 1072 rdiv = SI5351_OUTPUT_CLK_DIV_1; 1073 new_rate = req->best_parent_rate; 1074 err = abs(new_rate - rate); 1075 do { 1076 new_rate >>= 1; 1077 new_err = abs(new_rate - rate); 1078 if (new_err > err || rdiv == SI5351_OUTPUT_CLK_DIV_128) 1079 break; 1080 rdiv++; 1081 err = new_err; 1082 } while (1); 1083 } 1084 rate = req->best_parent_rate >> rdiv; 1085 1086 dev_dbg(&hwdata->drvdata->client->dev, 1087 "%s - %s: rdiv = %u, parent_rate = %lu, rate = %lu\n", 1088 __func__, clk_hw_get_name(hw), (1 << rdiv), 1089 req->best_parent_rate, rate); 1090 1091 req->rate = rate; 1092 return 0; 1093 } 1094 1095 static int si5351_clkout_set_rate(struct clk_hw *hw, unsigned long rate, 1096 unsigned long parent_rate) 1097 { 1098 struct si5351_hw_data *hwdata = 1099 container_of(hw, struct si5351_hw_data, hw); 1100 unsigned long new_rate, new_err, err; 1101 unsigned char rdiv; 1102 1103 /* round to closed rdiv */ 1104 rdiv = SI5351_OUTPUT_CLK_DIV_1; 1105 new_rate = parent_rate; 1106 err = abs(new_rate - rate); 1107 do { 1108 new_rate >>= 1; 1109 new_err = abs(new_rate - rate); 1110 if (new_err > err || rdiv == SI5351_OUTPUT_CLK_DIV_128) 1111 break; 1112 rdiv++; 1113 err = new_err; 1114 } while (1); 1115 1116 /* write output divider */ 1117 switch (hwdata->num) { 1118 case 6: 1119 si5351_set_bits(hwdata->drvdata, SI5351_CLK6_7_OUTPUT_DIVIDER, 1120 SI5351_OUTPUT_CLK6_DIV_MASK, rdiv); 1121 break; 1122 case 7: 1123 si5351_set_bits(hwdata->drvdata, SI5351_CLK6_7_OUTPUT_DIVIDER, 1124 SI5351_OUTPUT_CLK_DIV_MASK, 1125 rdiv << SI5351_OUTPUT_CLK_DIV_SHIFT); 1126 break; 1127 default: 1128 si5351_set_bits(hwdata->drvdata, 1129 si5351_msynth_params_address(hwdata->num) + 2, 1130 SI5351_OUTPUT_CLK_DIV_MASK, 1131 rdiv << SI5351_OUTPUT_CLK_DIV_SHIFT); 1132 } 1133 1134 /* powerup clkout */ 1135 si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num, 1136 SI5351_CLK_POWERDOWN, 0); 1137 1138 dev_dbg(&hwdata->drvdata->client->dev, 1139 "%s - %s: rdiv = %u, parent_rate = %lu, rate = %lu\n", 1140 __func__, clk_hw_get_name(hw), (1 << rdiv), 1141 parent_rate, rate); 1142 1143 return 0; 1144 } 1145 1146 static const struct clk_ops si5351_clkout_ops = { 1147 .prepare = si5351_clkout_prepare, 1148 .unprepare = si5351_clkout_unprepare, 1149 .set_parent = si5351_clkout_set_parent, 1150 .get_parent = si5351_clkout_get_parent, 1151 .recalc_rate = si5351_clkout_recalc_rate, 1152 .determine_rate = si5351_clkout_determine_rate, 1153 .set_rate = si5351_clkout_set_rate, 1154 }; 1155 1156 /* 1157 * Si5351 i2c probe and DT 1158 */ 1159 #ifdef CONFIG_OF 1160 static const struct of_device_id si5351_dt_ids[] = { 1161 { .compatible = "silabs,si5351a", .data = (void *)SI5351_VARIANT_A, }, 1162 { .compatible = "silabs,si5351a-msop", 1163 .data = (void *)SI5351_VARIANT_A3, }, 1164 { .compatible = "silabs,si5351b", .data = (void *)SI5351_VARIANT_B, }, 1165 { .compatible = "silabs,si5351c", .data = (void *)SI5351_VARIANT_C, }, 1166 { } 1167 }; 1168 MODULE_DEVICE_TABLE(of, si5351_dt_ids); 1169 1170 static int si5351_dt_parse(struct i2c_client *client, 1171 enum si5351_variant variant) 1172 { 1173 struct device_node *child, *np = client->dev.of_node; 1174 struct si5351_platform_data *pdata; 1175 struct property *prop; 1176 const __be32 *p; 1177 int num = 0; 1178 u32 val; 1179 1180 if (np == NULL) 1181 return 0; 1182 1183 pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL); 1184 if (!pdata) 1185 return -ENOMEM; 1186 1187 /* 1188 * property silabs,pll-source : <num src>, [<..>] 1189 * allow to selectively set pll source 1190 */ 1191 of_property_for_each_u32(np, "silabs,pll-source", prop, p, num) { 1192 if (num >= 2) { 1193 dev_err(&client->dev, 1194 "invalid pll %d on pll-source prop\n", num); 1195 return -EINVAL; 1196 } 1197 1198 p = of_prop_next_u32(prop, p, &val); 1199 if (!p) { 1200 dev_err(&client->dev, 1201 "missing pll-source for pll %d\n", num); 1202 return -EINVAL; 1203 } 1204 1205 switch (val) { 1206 case 0: 1207 pdata->pll_src[num] = SI5351_PLL_SRC_XTAL; 1208 break; 1209 case 1: 1210 if (variant != SI5351_VARIANT_C) { 1211 dev_err(&client->dev, 1212 "invalid parent %d for pll %d\n", 1213 val, num); 1214 return -EINVAL; 1215 } 1216 pdata->pll_src[num] = SI5351_PLL_SRC_CLKIN; 1217 break; 1218 default: 1219 dev_err(&client->dev, 1220 "invalid parent %d for pll %d\n", val, num); 1221 return -EINVAL; 1222 } 1223 } 1224 1225 /* per clkout properties */ 1226 for_each_child_of_node(np, child) { 1227 if (of_property_read_u32(child, "reg", &num)) { 1228 dev_err(&client->dev, "missing reg property of %pOFn\n", 1229 child); 1230 goto put_child; 1231 } 1232 1233 if (num >= 8 || 1234 (variant == SI5351_VARIANT_A3 && num >= 3)) { 1235 dev_err(&client->dev, "invalid clkout %d\n", num); 1236 goto put_child; 1237 } 1238 1239 if (!of_property_read_u32(child, "silabs,multisynth-source", 1240 &val)) { 1241 switch (val) { 1242 case 0: 1243 pdata->clkout[num].multisynth_src = 1244 SI5351_MULTISYNTH_SRC_VCO0; 1245 break; 1246 case 1: 1247 pdata->clkout[num].multisynth_src = 1248 SI5351_MULTISYNTH_SRC_VCO1; 1249 break; 1250 default: 1251 dev_err(&client->dev, 1252 "invalid parent %d for multisynth %d\n", 1253 val, num); 1254 goto put_child; 1255 } 1256 } 1257 1258 if (!of_property_read_u32(child, "silabs,clock-source", &val)) { 1259 switch (val) { 1260 case 0: 1261 pdata->clkout[num].clkout_src = 1262 SI5351_CLKOUT_SRC_MSYNTH_N; 1263 break; 1264 case 1: 1265 pdata->clkout[num].clkout_src = 1266 SI5351_CLKOUT_SRC_MSYNTH_0_4; 1267 break; 1268 case 2: 1269 pdata->clkout[num].clkout_src = 1270 SI5351_CLKOUT_SRC_XTAL; 1271 break; 1272 case 3: 1273 if (variant != SI5351_VARIANT_C) { 1274 dev_err(&client->dev, 1275 "invalid parent %d for clkout %d\n", 1276 val, num); 1277 goto put_child; 1278 } 1279 pdata->clkout[num].clkout_src = 1280 SI5351_CLKOUT_SRC_CLKIN; 1281 break; 1282 default: 1283 dev_err(&client->dev, 1284 "invalid parent %d for clkout %d\n", 1285 val, num); 1286 goto put_child; 1287 } 1288 } 1289 1290 if (!of_property_read_u32(child, "silabs,drive-strength", 1291 &val)) { 1292 switch (val) { 1293 case SI5351_DRIVE_2MA: 1294 case SI5351_DRIVE_4MA: 1295 case SI5351_DRIVE_6MA: 1296 case SI5351_DRIVE_8MA: 1297 pdata->clkout[num].drive = val; 1298 break; 1299 default: 1300 dev_err(&client->dev, 1301 "invalid drive strength %d for clkout %d\n", 1302 val, num); 1303 goto put_child; 1304 } 1305 } 1306 1307 if (!of_property_read_u32(child, "silabs,disable-state", 1308 &val)) { 1309 switch (val) { 1310 case 0: 1311 pdata->clkout[num].disable_state = 1312 SI5351_DISABLE_LOW; 1313 break; 1314 case 1: 1315 pdata->clkout[num].disable_state = 1316 SI5351_DISABLE_HIGH; 1317 break; 1318 case 2: 1319 pdata->clkout[num].disable_state = 1320 SI5351_DISABLE_FLOATING; 1321 break; 1322 case 3: 1323 pdata->clkout[num].disable_state = 1324 SI5351_DISABLE_NEVER; 1325 break; 1326 default: 1327 dev_err(&client->dev, 1328 "invalid disable state %d for clkout %d\n", 1329 val, num); 1330 goto put_child; 1331 } 1332 } 1333 1334 if (!of_property_read_u32(child, "clock-frequency", &val)) 1335 pdata->clkout[num].rate = val; 1336 1337 pdata->clkout[num].pll_master = 1338 of_property_read_bool(child, "silabs,pll-master"); 1339 1340 pdata->clkout[num].pll_reset = 1341 of_property_read_bool(child, "silabs,pll-reset"); 1342 } 1343 client->dev.platform_data = pdata; 1344 1345 return 0; 1346 put_child: 1347 of_node_put(child); 1348 return -EINVAL; 1349 } 1350 1351 static struct clk_hw * 1352 si53351_of_clk_get(struct of_phandle_args *clkspec, void *data) 1353 { 1354 struct si5351_driver_data *drvdata = data; 1355 unsigned int idx = clkspec->args[0]; 1356 1357 if (idx >= drvdata->num_clkout) { 1358 pr_err("%s: invalid index %u\n", __func__, idx); 1359 return ERR_PTR(-EINVAL); 1360 } 1361 1362 return &drvdata->clkout[idx].hw; 1363 } 1364 #else 1365 static int si5351_dt_parse(struct i2c_client *client, enum si5351_variant variant) 1366 { 1367 return 0; 1368 } 1369 1370 static struct clk_hw * 1371 si53351_of_clk_get(struct of_phandle_args *clkspec, void *data) 1372 { 1373 return NULL; 1374 } 1375 #endif /* CONFIG_OF */ 1376 1377 static const struct i2c_device_id si5351_i2c_ids[] = { 1378 { "si5351a", SI5351_VARIANT_A }, 1379 { "si5351a-msop", SI5351_VARIANT_A3 }, 1380 { "si5351b", SI5351_VARIANT_B }, 1381 { "si5351c", SI5351_VARIANT_C }, 1382 { } 1383 }; 1384 MODULE_DEVICE_TABLE(i2c, si5351_i2c_ids); 1385 1386 static int si5351_i2c_probe(struct i2c_client *client) 1387 { 1388 const struct i2c_device_id *id = i2c_match_id(si5351_i2c_ids, client); 1389 enum si5351_variant variant = (enum si5351_variant)id->driver_data; 1390 struct si5351_platform_data *pdata; 1391 struct si5351_driver_data *drvdata; 1392 struct clk_init_data init; 1393 const char *parent_names[4]; 1394 u8 num_parents, num_clocks; 1395 int ret, n; 1396 1397 ret = si5351_dt_parse(client, variant); 1398 if (ret) 1399 return ret; 1400 1401 pdata = client->dev.platform_data; 1402 if (!pdata) 1403 return -EINVAL; 1404 1405 drvdata = devm_kzalloc(&client->dev, sizeof(*drvdata), GFP_KERNEL); 1406 if (!drvdata) 1407 return -ENOMEM; 1408 1409 i2c_set_clientdata(client, drvdata); 1410 drvdata->client = client; 1411 drvdata->variant = variant; 1412 drvdata->pxtal = devm_clk_get(&client->dev, "xtal"); 1413 drvdata->pclkin = devm_clk_get(&client->dev, "clkin"); 1414 1415 if (PTR_ERR(drvdata->pxtal) == -EPROBE_DEFER || 1416 PTR_ERR(drvdata->pclkin) == -EPROBE_DEFER) 1417 return -EPROBE_DEFER; 1418 1419 /* 1420 * Check for valid parent clock: VARIANT_A and VARIANT_B need XTAL, 1421 * VARIANT_C can have CLKIN instead. 1422 */ 1423 if (IS_ERR(drvdata->pxtal) && 1424 (drvdata->variant != SI5351_VARIANT_C || IS_ERR(drvdata->pclkin))) { 1425 dev_err(&client->dev, "missing parent clock\n"); 1426 return -EINVAL; 1427 } 1428 1429 drvdata->regmap = devm_regmap_init_i2c(client, &si5351_regmap_config); 1430 if (IS_ERR(drvdata->regmap)) { 1431 dev_err(&client->dev, "failed to allocate register map\n"); 1432 return PTR_ERR(drvdata->regmap); 1433 } 1434 1435 /* Disable interrupts */ 1436 si5351_reg_write(drvdata, SI5351_INTERRUPT_MASK, 0xf0); 1437 /* Ensure pll select is on XTAL for Si5351A/B */ 1438 if (drvdata->variant != SI5351_VARIANT_C) 1439 si5351_set_bits(drvdata, SI5351_PLL_INPUT_SOURCE, 1440 SI5351_PLLA_SOURCE | SI5351_PLLB_SOURCE, 0); 1441 1442 /* setup clock configuration */ 1443 for (n = 0; n < 2; n++) { 1444 ret = _si5351_pll_reparent(drvdata, n, pdata->pll_src[n]); 1445 if (ret) { 1446 dev_err(&client->dev, 1447 "failed to reparent pll %d to %d\n", 1448 n, pdata->pll_src[n]); 1449 return ret; 1450 } 1451 } 1452 1453 for (n = 0; n < 8; n++) { 1454 ret = _si5351_msynth_reparent(drvdata, n, 1455 pdata->clkout[n].multisynth_src); 1456 if (ret) { 1457 dev_err(&client->dev, 1458 "failed to reparent multisynth %d to %d\n", 1459 n, pdata->clkout[n].multisynth_src); 1460 return ret; 1461 } 1462 1463 ret = _si5351_clkout_reparent(drvdata, n, 1464 pdata->clkout[n].clkout_src); 1465 if (ret) { 1466 dev_err(&client->dev, 1467 "failed to reparent clkout %d to %d\n", 1468 n, pdata->clkout[n].clkout_src); 1469 return ret; 1470 } 1471 1472 ret = _si5351_clkout_set_drive_strength(drvdata, n, 1473 pdata->clkout[n].drive); 1474 if (ret) { 1475 dev_err(&client->dev, 1476 "failed set drive strength of clkout%d to %d\n", 1477 n, pdata->clkout[n].drive); 1478 return ret; 1479 } 1480 1481 ret = _si5351_clkout_set_disable_state(drvdata, n, 1482 pdata->clkout[n].disable_state); 1483 if (ret) { 1484 dev_err(&client->dev, 1485 "failed set disable state of clkout%d to %d\n", 1486 n, pdata->clkout[n].disable_state); 1487 return ret; 1488 } 1489 } 1490 1491 /* register xtal input clock gate */ 1492 memset(&init, 0, sizeof(init)); 1493 init.name = si5351_input_names[0]; 1494 init.ops = &si5351_xtal_ops; 1495 init.flags = 0; 1496 if (!IS_ERR(drvdata->pxtal)) { 1497 drvdata->pxtal_name = __clk_get_name(drvdata->pxtal); 1498 init.parent_names = &drvdata->pxtal_name; 1499 init.num_parents = 1; 1500 } 1501 drvdata->xtal.init = &init; 1502 ret = devm_clk_hw_register(&client->dev, &drvdata->xtal); 1503 if (ret) { 1504 dev_err(&client->dev, "unable to register %s\n", init.name); 1505 return ret; 1506 } 1507 1508 /* register clkin input clock gate */ 1509 if (drvdata->variant == SI5351_VARIANT_C) { 1510 memset(&init, 0, sizeof(init)); 1511 init.name = si5351_input_names[1]; 1512 init.ops = &si5351_clkin_ops; 1513 if (!IS_ERR(drvdata->pclkin)) { 1514 drvdata->pclkin_name = __clk_get_name(drvdata->pclkin); 1515 init.parent_names = &drvdata->pclkin_name; 1516 init.num_parents = 1; 1517 } 1518 drvdata->clkin.init = &init; 1519 ret = devm_clk_hw_register(&client->dev, &drvdata->clkin); 1520 if (ret) { 1521 dev_err(&client->dev, "unable to register %s\n", 1522 init.name); 1523 return ret; 1524 } 1525 } 1526 1527 /* Si5351C allows to mux either xtal or clkin to PLL input */ 1528 num_parents = (drvdata->variant == SI5351_VARIANT_C) ? 2 : 1; 1529 parent_names[0] = si5351_input_names[0]; 1530 parent_names[1] = si5351_input_names[1]; 1531 1532 /* register PLLA */ 1533 drvdata->pll[0].num = 0; 1534 drvdata->pll[0].drvdata = drvdata; 1535 drvdata->pll[0].hw.init = &init; 1536 memset(&init, 0, sizeof(init)); 1537 init.name = si5351_pll_names[0]; 1538 init.ops = &si5351_pll_ops; 1539 init.flags = 0; 1540 init.parent_names = parent_names; 1541 init.num_parents = num_parents; 1542 ret = devm_clk_hw_register(&client->dev, &drvdata->pll[0].hw); 1543 if (ret) { 1544 dev_err(&client->dev, "unable to register %s\n", init.name); 1545 return ret; 1546 } 1547 1548 /* register PLLB or VXCO (Si5351B) */ 1549 drvdata->pll[1].num = 1; 1550 drvdata->pll[1].drvdata = drvdata; 1551 drvdata->pll[1].hw.init = &init; 1552 memset(&init, 0, sizeof(init)); 1553 if (drvdata->variant == SI5351_VARIANT_B) { 1554 init.name = si5351_pll_names[2]; 1555 init.ops = &si5351_vxco_ops; 1556 init.flags = 0; 1557 init.parent_names = NULL; 1558 init.num_parents = 0; 1559 } else { 1560 init.name = si5351_pll_names[1]; 1561 init.ops = &si5351_pll_ops; 1562 init.flags = 0; 1563 init.parent_names = parent_names; 1564 init.num_parents = num_parents; 1565 } 1566 ret = devm_clk_hw_register(&client->dev, &drvdata->pll[1].hw); 1567 if (ret) { 1568 dev_err(&client->dev, "unable to register %s\n", init.name); 1569 return ret; 1570 } 1571 1572 /* register clk multisync and clk out divider */ 1573 num_clocks = (drvdata->variant == SI5351_VARIANT_A3) ? 3 : 8; 1574 parent_names[0] = si5351_pll_names[0]; 1575 if (drvdata->variant == SI5351_VARIANT_B) 1576 parent_names[1] = si5351_pll_names[2]; 1577 else 1578 parent_names[1] = si5351_pll_names[1]; 1579 1580 drvdata->msynth = devm_kcalloc(&client->dev, num_clocks, 1581 sizeof(*drvdata->msynth), GFP_KERNEL); 1582 drvdata->clkout = devm_kcalloc(&client->dev, num_clocks, 1583 sizeof(*drvdata->clkout), GFP_KERNEL); 1584 drvdata->num_clkout = num_clocks; 1585 1586 if (WARN_ON(!drvdata->msynth || !drvdata->clkout)) { 1587 ret = -ENOMEM; 1588 return ret; 1589 } 1590 1591 for (n = 0; n < num_clocks; n++) { 1592 drvdata->msynth[n].num = n; 1593 drvdata->msynth[n].drvdata = drvdata; 1594 drvdata->msynth[n].hw.init = &init; 1595 memset(&init, 0, sizeof(init)); 1596 init.name = si5351_msynth_names[n]; 1597 init.ops = &si5351_msynth_ops; 1598 init.flags = 0; 1599 if (pdata->clkout[n].pll_master) 1600 init.flags |= CLK_SET_RATE_PARENT; 1601 init.parent_names = parent_names; 1602 init.num_parents = 2; 1603 ret = devm_clk_hw_register(&client->dev, 1604 &drvdata->msynth[n].hw); 1605 if (ret) { 1606 dev_err(&client->dev, "unable to register %s\n", 1607 init.name); 1608 return ret; 1609 } 1610 } 1611 1612 num_parents = (drvdata->variant == SI5351_VARIANT_C) ? 4 : 3; 1613 parent_names[2] = si5351_input_names[0]; 1614 parent_names[3] = si5351_input_names[1]; 1615 for (n = 0; n < num_clocks; n++) { 1616 parent_names[0] = si5351_msynth_names[n]; 1617 parent_names[1] = (n < 4) ? si5351_msynth_names[0] : 1618 si5351_msynth_names[4]; 1619 1620 drvdata->clkout[n].num = n; 1621 drvdata->clkout[n].drvdata = drvdata; 1622 drvdata->clkout[n].hw.init = &init; 1623 memset(&init, 0, sizeof(init)); 1624 init.name = si5351_clkout_names[n]; 1625 init.ops = &si5351_clkout_ops; 1626 init.flags = 0; 1627 if (pdata->clkout[n].clkout_src == SI5351_CLKOUT_SRC_MSYNTH_N) 1628 init.flags |= CLK_SET_RATE_PARENT; 1629 init.parent_names = parent_names; 1630 init.num_parents = num_parents; 1631 ret = devm_clk_hw_register(&client->dev, 1632 &drvdata->clkout[n].hw); 1633 if (ret) { 1634 dev_err(&client->dev, "unable to register %s\n", 1635 init.name); 1636 return ret; 1637 } 1638 1639 /* set initial clkout rate */ 1640 if (pdata->clkout[n].rate != 0) { 1641 int ret; 1642 ret = clk_set_rate(drvdata->clkout[n].hw.clk, 1643 pdata->clkout[n].rate); 1644 if (ret != 0) { 1645 dev_err(&client->dev, "Cannot set rate : %d\n", 1646 ret); 1647 } 1648 } 1649 } 1650 1651 ret = devm_of_clk_add_hw_provider(&client->dev, si53351_of_clk_get, 1652 drvdata); 1653 if (ret) { 1654 dev_err(&client->dev, "unable to add clk provider\n"); 1655 return ret; 1656 } 1657 1658 return 0; 1659 } 1660 1661 static struct i2c_driver si5351_driver = { 1662 .driver = { 1663 .name = "si5351", 1664 .of_match_table = of_match_ptr(si5351_dt_ids), 1665 }, 1666 .probe = si5351_i2c_probe, 1667 .id_table = si5351_i2c_ids, 1668 }; 1669 module_i2c_driver(si5351_driver); 1670 1671 MODULE_AUTHOR("Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com"); 1672 MODULE_DESCRIPTION("Silicon Labs Si5351A/B/C clock generator driver"); 1673 MODULE_LICENSE("GPL"); 1674