1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Driver for Silicon Labs Si5340, Si5341, Si5342, Si5344 and Si5345 4 * Copyright (C) 2019 Topic Embedded Products 5 * Author: Mike Looijmans <mike.looijmans@topic.nl> 6 * 7 * The Si5341 has 10 outputs and 5 synthesizers. 8 * The Si5340 is a smaller version of the Si5341 with only 4 outputs. 9 * The Si5345 is similar to the Si5341, with the addition of fractional input 10 * dividers and automatic input selection. 11 * The Si5342 and Si5344 are smaller versions of the Si5345. 12 */ 13 14 #include <linux/clk.h> 15 #include <linux/clk-provider.h> 16 #include <linux/delay.h> 17 #include <linux/gcd.h> 18 #include <linux/math64.h> 19 #include <linux/i2c.h> 20 #include <linux/module.h> 21 #include <linux/regmap.h> 22 #include <linux/regulator/consumer.h> 23 #include <linux/slab.h> 24 #include <asm/unaligned.h> 25 26 #define SI5341_NUM_INPUTS 4 27 28 #define SI5340_MAX_NUM_OUTPUTS 4 29 #define SI5341_MAX_NUM_OUTPUTS 10 30 #define SI5342_MAX_NUM_OUTPUTS 2 31 #define SI5344_MAX_NUM_OUTPUTS 4 32 #define SI5345_MAX_NUM_OUTPUTS 10 33 34 #define SI5340_NUM_SYNTH 4 35 #define SI5341_NUM_SYNTH 5 36 #define SI5342_NUM_SYNTH 2 37 #define SI5344_NUM_SYNTH 4 38 #define SI5345_NUM_SYNTH 5 39 40 /* Range of the synthesizer fractional divider */ 41 #define SI5341_SYNTH_N_MIN 10 42 #define SI5341_SYNTH_N_MAX 4095 43 44 /* The chip can get its input clock from 3 input pins or an XTAL */ 45 46 /* There is one PLL running at 13500–14256 MHz */ 47 #define SI5341_PLL_VCO_MIN 13500000000ull 48 #define SI5341_PLL_VCO_MAX 14256000000ull 49 50 /* The 5 frequency synthesizers obtain their input from the PLL */ 51 struct clk_si5341_synth { 52 struct clk_hw hw; 53 struct clk_si5341 *data; 54 u8 index; 55 }; 56 #define to_clk_si5341_synth(_hw) \ 57 container_of(_hw, struct clk_si5341_synth, hw) 58 59 /* The output stages can be connected to any synth (full mux) */ 60 struct clk_si5341_output { 61 struct clk_hw hw; 62 struct clk_si5341 *data; 63 struct regulator *vddo_reg; 64 u8 index; 65 }; 66 #define to_clk_si5341_output(_hw) \ 67 container_of(_hw, struct clk_si5341_output, hw) 68 69 struct clk_si5341 { 70 struct clk_hw hw; 71 struct regmap *regmap; 72 struct i2c_client *i2c_client; 73 struct clk_si5341_synth synth[SI5341_NUM_SYNTH]; 74 struct clk_si5341_output clk[SI5341_MAX_NUM_OUTPUTS]; 75 struct clk *input_clk[SI5341_NUM_INPUTS]; 76 const char *input_clk_name[SI5341_NUM_INPUTS]; 77 const u16 *reg_output_offset; 78 const u16 *reg_rdiv_offset; 79 u64 freq_vco; /* 13500–14256 MHz */ 80 u8 num_outputs; 81 u8 num_synth; 82 u16 chip_id; 83 bool xaxb_ext_clk; 84 bool iovdd_33; 85 }; 86 #define to_clk_si5341(_hw) container_of(_hw, struct clk_si5341, hw) 87 88 struct clk_si5341_output_config { 89 u8 out_format_drv_bits; 90 u8 out_cm_ampl_bits; 91 u8 vdd_sel_bits; 92 bool synth_master; 93 bool always_on; 94 }; 95 96 #define SI5341_PAGE 0x0001 97 #define SI5341_PN_BASE 0x0002 98 #define SI5341_DEVICE_REV 0x0005 99 #define SI5341_STATUS 0x000C 100 #define SI5341_LOS 0x000D 101 #define SI5341_STATUS_STICKY 0x0011 102 #define SI5341_LOS_STICKY 0x0012 103 #define SI5341_SOFT_RST 0x001C 104 #define SI5341_IN_SEL 0x0021 105 #define SI5341_DEVICE_READY 0x00FE 106 #define SI5341_XAXB_CFG 0x090E 107 #define SI5341_IO_VDD_SEL 0x0943 108 #define SI5341_IN_EN 0x0949 109 #define SI5341_INX_TO_PFD_EN 0x094A 110 111 /* Status bits */ 112 #define SI5341_STATUS_SYSINCAL BIT(0) 113 #define SI5341_STATUS_LOSXAXB BIT(1) 114 #define SI5341_STATUS_LOSREF BIT(2) 115 #define SI5341_STATUS_LOL BIT(3) 116 117 /* Input selection */ 118 #define SI5341_IN_SEL_MASK 0x06 119 #define SI5341_IN_SEL_SHIFT 1 120 #define SI5341_IN_SEL_REGCTRL 0x01 121 #define SI5341_INX_TO_PFD_SHIFT 4 122 123 /* XTAL config bits */ 124 #define SI5341_XAXB_CFG_EXTCLK_EN BIT(0) 125 #define SI5341_XAXB_CFG_PDNB BIT(1) 126 127 /* Input dividers (48-bit) */ 128 #define SI5341_IN_PDIV(x) (0x0208 + ((x) * 10)) 129 #define SI5341_IN_PSET(x) (0x020E + ((x) * 10)) 130 #define SI5341_PX_UPD 0x0230 131 132 /* PLL configuration */ 133 #define SI5341_PLL_M_NUM 0x0235 134 #define SI5341_PLL_M_DEN 0x023B 135 136 /* Output configuration */ 137 #define SI5341_OUT_CONFIG(output) \ 138 ((output)->data->reg_output_offset[(output)->index]) 139 #define SI5341_OUT_FORMAT(output) (SI5341_OUT_CONFIG(output) + 1) 140 #define SI5341_OUT_CM(output) (SI5341_OUT_CONFIG(output) + 2) 141 #define SI5341_OUT_MUX_SEL(output) (SI5341_OUT_CONFIG(output) + 3) 142 #define SI5341_OUT_R_REG(output) \ 143 ((output)->data->reg_rdiv_offset[(output)->index]) 144 145 #define SI5341_OUT_MUX_VDD_SEL_MASK 0x38 146 147 /* Synthesize N divider */ 148 #define SI5341_SYNTH_N_NUM(x) (0x0302 + ((x) * 11)) 149 #define SI5341_SYNTH_N_DEN(x) (0x0308 + ((x) * 11)) 150 #define SI5341_SYNTH_N_UPD(x) (0x030C + ((x) * 11)) 151 152 /* Synthesizer output enable, phase bypass, power mode */ 153 #define SI5341_SYNTH_N_CLK_TO_OUTX_EN 0x0A03 154 #define SI5341_SYNTH_N_PIBYP 0x0A04 155 #define SI5341_SYNTH_N_PDNB 0x0A05 156 #define SI5341_SYNTH_N_CLK_DIS 0x0B4A 157 158 #define SI5341_REGISTER_MAX 0xBFF 159 160 /* SI5341_OUT_CONFIG bits */ 161 #define SI5341_OUT_CFG_PDN BIT(0) 162 #define SI5341_OUT_CFG_OE BIT(1) 163 #define SI5341_OUT_CFG_RDIV_FORCE2 BIT(2) 164 165 /* Static configuration (to be moved to firmware) */ 166 struct si5341_reg_default { 167 u16 address; 168 u8 value; 169 }; 170 171 static const char * const si5341_input_clock_names[] = { 172 "in0", "in1", "in2", "xtal" 173 }; 174 175 /* Output configuration registers 0..9 are not quite logically organized */ 176 /* Also for si5345 */ 177 static const u16 si5341_reg_output_offset[] = { 178 0x0108, 179 0x010D, 180 0x0112, 181 0x0117, 182 0x011C, 183 0x0121, 184 0x0126, 185 0x012B, 186 0x0130, 187 0x013A, 188 }; 189 190 /* for si5340, si5342 and si5344 */ 191 static const u16 si5340_reg_output_offset[] = { 192 0x0112, 193 0x0117, 194 0x0126, 195 0x012B, 196 }; 197 198 /* The location of the R divider registers */ 199 static const u16 si5341_reg_rdiv_offset[] = { 200 0x024A, 201 0x024D, 202 0x0250, 203 0x0253, 204 0x0256, 205 0x0259, 206 0x025C, 207 0x025F, 208 0x0262, 209 0x0268, 210 }; 211 static const u16 si5340_reg_rdiv_offset[] = { 212 0x0250, 213 0x0253, 214 0x025C, 215 0x025F, 216 }; 217 218 /* 219 * Programming sequence from ClockBuilder, settings to initialize the system 220 * using only the XTAL input, without pre-divider. 221 * This also contains settings that aren't mentioned anywhere in the datasheet. 222 * The "known" settings like synth and output configuration are done later. 223 */ 224 static const struct si5341_reg_default si5341_reg_defaults[] = { 225 { 0x0017, 0x3A }, /* INT mask (disable interrupts) */ 226 { 0x0018, 0xFF }, /* INT mask */ 227 { 0x0021, 0x0F }, /* Select XTAL as input */ 228 { 0x0022, 0x00 }, /* Not in datasheet */ 229 { 0x002B, 0x02 }, /* SPI config */ 230 { 0x002C, 0x20 }, /* LOS enable for XTAL */ 231 { 0x002D, 0x00 }, /* LOS timing */ 232 { 0x002E, 0x00 }, 233 { 0x002F, 0x00 }, 234 { 0x0030, 0x00 }, 235 { 0x0031, 0x00 }, 236 { 0x0032, 0x00 }, 237 { 0x0033, 0x00 }, 238 { 0x0034, 0x00 }, 239 { 0x0035, 0x00 }, 240 { 0x0036, 0x00 }, 241 { 0x0037, 0x00 }, 242 { 0x0038, 0x00 }, /* LOS setting (thresholds) */ 243 { 0x0039, 0x00 }, 244 { 0x003A, 0x00 }, 245 { 0x003B, 0x00 }, 246 { 0x003C, 0x00 }, 247 { 0x003D, 0x00 }, /* LOS setting (thresholds) end */ 248 { 0x0041, 0x00 }, /* LOS0_DIV_SEL */ 249 { 0x0042, 0x00 }, /* LOS1_DIV_SEL */ 250 { 0x0043, 0x00 }, /* LOS2_DIV_SEL */ 251 { 0x0044, 0x00 }, /* LOS3_DIV_SEL */ 252 { 0x009E, 0x00 }, /* Not in datasheet */ 253 { 0x0102, 0x01 }, /* Enable outputs */ 254 { 0x013F, 0x00 }, /* Not in datasheet */ 255 { 0x0140, 0x00 }, /* Not in datasheet */ 256 { 0x0141, 0x40 }, /* OUT LOS */ 257 { 0x0202, 0x00 }, /* XAXB_FREQ_OFFSET (=0)*/ 258 { 0x0203, 0x00 }, 259 { 0x0204, 0x00 }, 260 { 0x0205, 0x00 }, 261 { 0x0206, 0x00 }, /* PXAXB (2^x) */ 262 { 0x0208, 0x00 }, /* Px divider setting (usually 0) */ 263 { 0x0209, 0x00 }, 264 { 0x020A, 0x00 }, 265 { 0x020B, 0x00 }, 266 { 0x020C, 0x00 }, 267 { 0x020D, 0x00 }, 268 { 0x020E, 0x00 }, 269 { 0x020F, 0x00 }, 270 { 0x0210, 0x00 }, 271 { 0x0211, 0x00 }, 272 { 0x0212, 0x00 }, 273 { 0x0213, 0x00 }, 274 { 0x0214, 0x00 }, 275 { 0x0215, 0x00 }, 276 { 0x0216, 0x00 }, 277 { 0x0217, 0x00 }, 278 { 0x0218, 0x00 }, 279 { 0x0219, 0x00 }, 280 { 0x021A, 0x00 }, 281 { 0x021B, 0x00 }, 282 { 0x021C, 0x00 }, 283 { 0x021D, 0x00 }, 284 { 0x021E, 0x00 }, 285 { 0x021F, 0x00 }, 286 { 0x0220, 0x00 }, 287 { 0x0221, 0x00 }, 288 { 0x0222, 0x00 }, 289 { 0x0223, 0x00 }, 290 { 0x0224, 0x00 }, 291 { 0x0225, 0x00 }, 292 { 0x0226, 0x00 }, 293 { 0x0227, 0x00 }, 294 { 0x0228, 0x00 }, 295 { 0x0229, 0x00 }, 296 { 0x022A, 0x00 }, 297 { 0x022B, 0x00 }, 298 { 0x022C, 0x00 }, 299 { 0x022D, 0x00 }, 300 { 0x022E, 0x00 }, 301 { 0x022F, 0x00 }, /* Px divider setting (usually 0) end */ 302 { 0x026B, 0x00 }, /* DESIGN_ID (ASCII string) */ 303 { 0x026C, 0x00 }, 304 { 0x026D, 0x00 }, 305 { 0x026E, 0x00 }, 306 { 0x026F, 0x00 }, 307 { 0x0270, 0x00 }, 308 { 0x0271, 0x00 }, 309 { 0x0272, 0x00 }, /* DESIGN_ID (ASCII string) end */ 310 { 0x0339, 0x1F }, /* N_FSTEP_MSK */ 311 { 0x033B, 0x00 }, /* Nx_FSTEPW (Frequency step) */ 312 { 0x033C, 0x00 }, 313 { 0x033D, 0x00 }, 314 { 0x033E, 0x00 }, 315 { 0x033F, 0x00 }, 316 { 0x0340, 0x00 }, 317 { 0x0341, 0x00 }, 318 { 0x0342, 0x00 }, 319 { 0x0343, 0x00 }, 320 { 0x0344, 0x00 }, 321 { 0x0345, 0x00 }, 322 { 0x0346, 0x00 }, 323 { 0x0347, 0x00 }, 324 { 0x0348, 0x00 }, 325 { 0x0349, 0x00 }, 326 { 0x034A, 0x00 }, 327 { 0x034B, 0x00 }, 328 { 0x034C, 0x00 }, 329 { 0x034D, 0x00 }, 330 { 0x034E, 0x00 }, 331 { 0x034F, 0x00 }, 332 { 0x0350, 0x00 }, 333 { 0x0351, 0x00 }, 334 { 0x0352, 0x00 }, 335 { 0x0353, 0x00 }, 336 { 0x0354, 0x00 }, 337 { 0x0355, 0x00 }, 338 { 0x0356, 0x00 }, 339 { 0x0357, 0x00 }, 340 { 0x0358, 0x00 }, /* Nx_FSTEPW (Frequency step) end */ 341 { 0x0359, 0x00 }, /* Nx_DELAY */ 342 { 0x035A, 0x00 }, 343 { 0x035B, 0x00 }, 344 { 0x035C, 0x00 }, 345 { 0x035D, 0x00 }, 346 { 0x035E, 0x00 }, 347 { 0x035F, 0x00 }, 348 { 0x0360, 0x00 }, 349 { 0x0361, 0x00 }, 350 { 0x0362, 0x00 }, /* Nx_DELAY end */ 351 { 0x0802, 0x00 }, /* Not in datasheet */ 352 { 0x0803, 0x00 }, /* Not in datasheet */ 353 { 0x0804, 0x00 }, /* Not in datasheet */ 354 { 0x090E, 0x02 }, /* XAXB_EXTCLK_EN=0 XAXB_PDNB=1 (use XTAL) */ 355 { 0x091C, 0x04 }, /* ZDM_EN=4 (Normal mode) */ 356 { 0x0949, 0x00 }, /* IN_EN (disable input clocks) */ 357 { 0x094A, 0x00 }, /* INx_TO_PFD_EN (disabled) */ 358 { 0x0A02, 0x00 }, /* Not in datasheet */ 359 { 0x0B44, 0x0F }, /* PDIV_ENB (datasheet does not mention what it is) */ 360 { 0x0B57, 0x10 }, /* VCO_RESET_CALCODE (not described in datasheet) */ 361 { 0x0B58, 0x05 }, /* VCO_RESET_CALCODE (not described in datasheet) */ 362 }; 363 364 /* Read and interpret a 44-bit followed by a 32-bit value in the regmap */ 365 static int si5341_decode_44_32(struct regmap *regmap, unsigned int reg, 366 u64 *val1, u32 *val2) 367 { 368 int err; 369 u8 r[10]; 370 371 err = regmap_bulk_read(regmap, reg, r, 10); 372 if (err < 0) 373 return err; 374 375 *val1 = ((u64)((r[5] & 0x0f) << 8 | r[4]) << 32) | 376 (get_unaligned_le32(r)); 377 *val2 = get_unaligned_le32(&r[6]); 378 379 return 0; 380 } 381 382 static int si5341_encode_44_32(struct regmap *regmap, unsigned int reg, 383 u64 n_num, u32 n_den) 384 { 385 u8 r[10]; 386 387 /* Shift left as far as possible without overflowing */ 388 while (!(n_num & BIT_ULL(43)) && !(n_den & BIT(31))) { 389 n_num <<= 1; 390 n_den <<= 1; 391 } 392 393 /* 44 bits (6 bytes) numerator */ 394 put_unaligned_le32(n_num, r); 395 r[4] = (n_num >> 32) & 0xff; 396 r[5] = (n_num >> 40) & 0x0f; 397 /* 32 bits denominator */ 398 put_unaligned_le32(n_den, &r[6]); 399 400 /* Program the fraction */ 401 return regmap_bulk_write(regmap, reg, r, sizeof(r)); 402 } 403 404 /* VCO, we assume it runs at a constant frequency */ 405 static unsigned long si5341_clk_recalc_rate(struct clk_hw *hw, 406 unsigned long parent_rate) 407 { 408 struct clk_si5341 *data = to_clk_si5341(hw); 409 int err; 410 u64 res; 411 u64 m_num; 412 u32 m_den; 413 unsigned int shift; 414 415 /* Assume that PDIV is not being used, just read the PLL setting */ 416 err = si5341_decode_44_32(data->regmap, SI5341_PLL_M_NUM, 417 &m_num, &m_den); 418 if (err < 0) 419 return 0; 420 421 if (!m_num || !m_den) 422 return 0; 423 424 /* 425 * Though m_num is 64-bit, only the upper bits are actually used. While 426 * calculating m_num and m_den, they are shifted as far as possible to 427 * the left. To avoid 96-bit division here, we just shift them back so 428 * we can do with just 64 bits. 429 */ 430 shift = 0; 431 res = m_num; 432 while (res & 0xffff00000000ULL) { 433 ++shift; 434 res >>= 1; 435 } 436 res *= parent_rate; 437 do_div(res, (m_den >> shift)); 438 439 /* We cannot return the actual frequency in 32 bit, store it locally */ 440 data->freq_vco = res; 441 442 /* Report kHz since the value is out of range */ 443 do_div(res, 1000); 444 445 return (unsigned long)res; 446 } 447 448 static int si5341_clk_get_selected_input(struct clk_si5341 *data) 449 { 450 int err; 451 u32 val; 452 453 err = regmap_read(data->regmap, SI5341_IN_SEL, &val); 454 if (err < 0) 455 return err; 456 457 return (val & SI5341_IN_SEL_MASK) >> SI5341_IN_SEL_SHIFT; 458 } 459 460 static u8 si5341_clk_get_parent(struct clk_hw *hw) 461 { 462 struct clk_si5341 *data = to_clk_si5341(hw); 463 int res = si5341_clk_get_selected_input(data); 464 465 if (res < 0) 466 return 0; /* Apparently we cannot report errors */ 467 468 return res; 469 } 470 471 static int si5341_clk_reparent(struct clk_si5341 *data, u8 index) 472 { 473 int err; 474 u8 val; 475 476 val = (index << SI5341_IN_SEL_SHIFT) & SI5341_IN_SEL_MASK; 477 /* Enable register-based input selection */ 478 val |= SI5341_IN_SEL_REGCTRL; 479 480 err = regmap_update_bits(data->regmap, 481 SI5341_IN_SEL, SI5341_IN_SEL_REGCTRL | SI5341_IN_SEL_MASK, val); 482 if (err < 0) 483 return err; 484 485 if (index < 3) { 486 /* Enable input buffer for selected input */ 487 err = regmap_update_bits(data->regmap, 488 SI5341_IN_EN, 0x07, BIT(index)); 489 if (err < 0) 490 return err; 491 492 /* Enables the input to phase detector */ 493 err = regmap_update_bits(data->regmap, SI5341_INX_TO_PFD_EN, 494 0x7 << SI5341_INX_TO_PFD_SHIFT, 495 BIT(index + SI5341_INX_TO_PFD_SHIFT)); 496 if (err < 0) 497 return err; 498 499 /* Power down XTAL oscillator and buffer */ 500 err = regmap_update_bits(data->regmap, SI5341_XAXB_CFG, 501 SI5341_XAXB_CFG_PDNB, 0); 502 if (err < 0) 503 return err; 504 505 /* 506 * Set the P divider to "1". There's no explanation in the 507 * datasheet of these registers, but the clockbuilder software 508 * programs a "1" when the input is being used. 509 */ 510 err = regmap_write(data->regmap, SI5341_IN_PDIV(index), 1); 511 if (err < 0) 512 return err; 513 514 err = regmap_write(data->regmap, SI5341_IN_PSET(index), 1); 515 if (err < 0) 516 return err; 517 518 /* Set update PDIV bit */ 519 err = regmap_write(data->regmap, SI5341_PX_UPD, BIT(index)); 520 if (err < 0) 521 return err; 522 } else { 523 /* Disable all input buffers */ 524 err = regmap_update_bits(data->regmap, SI5341_IN_EN, 0x07, 0); 525 if (err < 0) 526 return err; 527 528 /* Disable input to phase detector */ 529 err = regmap_update_bits(data->regmap, SI5341_INX_TO_PFD_EN, 530 0x7 << SI5341_INX_TO_PFD_SHIFT, 0); 531 if (err < 0) 532 return err; 533 534 /* Power up XTAL oscillator and buffer, select clock mode */ 535 err = regmap_update_bits(data->regmap, SI5341_XAXB_CFG, 536 SI5341_XAXB_CFG_PDNB | SI5341_XAXB_CFG_EXTCLK_EN, 537 SI5341_XAXB_CFG_PDNB | (data->xaxb_ext_clk ? 538 SI5341_XAXB_CFG_EXTCLK_EN : 0)); 539 if (err < 0) 540 return err; 541 } 542 543 return 0; 544 } 545 546 static int si5341_clk_set_parent(struct clk_hw *hw, u8 index) 547 { 548 struct clk_si5341 *data = to_clk_si5341(hw); 549 550 return si5341_clk_reparent(data, index); 551 } 552 553 static const struct clk_ops si5341_clk_ops = { 554 .determine_rate = clk_hw_determine_rate_no_reparent, 555 .set_parent = si5341_clk_set_parent, 556 .get_parent = si5341_clk_get_parent, 557 .recalc_rate = si5341_clk_recalc_rate, 558 }; 559 560 /* Synthesizers, there are 5 synthesizers that connect to any of the outputs */ 561 562 /* The synthesizer is on if all power and enable bits are set */ 563 static int si5341_synth_clk_is_on(struct clk_hw *hw) 564 { 565 struct clk_si5341_synth *synth = to_clk_si5341_synth(hw); 566 int err; 567 u32 val; 568 u8 index = synth->index; 569 570 err = regmap_read(synth->data->regmap, 571 SI5341_SYNTH_N_CLK_TO_OUTX_EN, &val); 572 if (err < 0) 573 return 0; 574 575 if (!(val & BIT(index))) 576 return 0; 577 578 err = regmap_read(synth->data->regmap, SI5341_SYNTH_N_PDNB, &val); 579 if (err < 0) 580 return 0; 581 582 if (!(val & BIT(index))) 583 return 0; 584 585 /* This bit must be 0 for the synthesizer to receive clock input */ 586 err = regmap_read(synth->data->regmap, SI5341_SYNTH_N_CLK_DIS, &val); 587 if (err < 0) 588 return 0; 589 590 return !(val & BIT(index)); 591 } 592 593 static void si5341_synth_clk_unprepare(struct clk_hw *hw) 594 { 595 struct clk_si5341_synth *synth = to_clk_si5341_synth(hw); 596 u8 index = synth->index; /* In range 0..5 */ 597 u8 mask = BIT(index); 598 599 /* Disable output */ 600 regmap_update_bits(synth->data->regmap, 601 SI5341_SYNTH_N_CLK_TO_OUTX_EN, mask, 0); 602 /* Power down */ 603 regmap_update_bits(synth->data->regmap, 604 SI5341_SYNTH_N_PDNB, mask, 0); 605 /* Disable clock input to synth (set to 1 to disable) */ 606 regmap_update_bits(synth->data->regmap, 607 SI5341_SYNTH_N_CLK_DIS, mask, mask); 608 } 609 610 static int si5341_synth_clk_prepare(struct clk_hw *hw) 611 { 612 struct clk_si5341_synth *synth = to_clk_si5341_synth(hw); 613 int err; 614 u8 index = synth->index; 615 u8 mask = BIT(index); 616 617 /* Power up */ 618 err = regmap_update_bits(synth->data->regmap, 619 SI5341_SYNTH_N_PDNB, mask, mask); 620 if (err < 0) 621 return err; 622 623 /* Enable clock input to synth (set bit to 0 to enable) */ 624 err = regmap_update_bits(synth->data->regmap, 625 SI5341_SYNTH_N_CLK_DIS, mask, 0); 626 if (err < 0) 627 return err; 628 629 /* Enable output */ 630 return regmap_update_bits(synth->data->regmap, 631 SI5341_SYNTH_N_CLK_TO_OUTX_EN, mask, mask); 632 } 633 634 /* Synth clock frequency: Fvco * n_den / n_den, with Fvco in 13500-14256 MHz */ 635 static unsigned long si5341_synth_clk_recalc_rate(struct clk_hw *hw, 636 unsigned long parent_rate) 637 { 638 struct clk_si5341_synth *synth = to_clk_si5341_synth(hw); 639 u64 f; 640 u64 n_num; 641 u32 n_den; 642 int err; 643 644 err = si5341_decode_44_32(synth->data->regmap, 645 SI5341_SYNTH_N_NUM(synth->index), &n_num, &n_den); 646 if (err < 0) 647 return err; 648 /* Check for bogus/uninitialized settings */ 649 if (!n_num || !n_den) 650 return 0; 651 652 /* 653 * n_num and n_den are shifted left as much as possible, so to prevent 654 * overflow in 64-bit math, we shift n_den 4 bits to the right 655 */ 656 f = synth->data->freq_vco; 657 f *= n_den >> 4; 658 659 /* Now we need to do 64-bit division: f/n_num */ 660 /* And compensate for the 4 bits we dropped */ 661 f = div64_u64(f, (n_num >> 4)); 662 663 return f; 664 } 665 666 static long si5341_synth_clk_round_rate(struct clk_hw *hw, unsigned long rate, 667 unsigned long *parent_rate) 668 { 669 struct clk_si5341_synth *synth = to_clk_si5341_synth(hw); 670 u64 f; 671 672 /* The synthesizer accuracy is such that anything in range will work */ 673 f = synth->data->freq_vco; 674 do_div(f, SI5341_SYNTH_N_MAX); 675 if (rate < f) 676 return f; 677 678 f = synth->data->freq_vco; 679 do_div(f, SI5341_SYNTH_N_MIN); 680 if (rate > f) 681 return f; 682 683 return rate; 684 } 685 686 static int si5341_synth_program(struct clk_si5341_synth *synth, 687 u64 n_num, u32 n_den, bool is_integer) 688 { 689 int err; 690 u8 index = synth->index; 691 692 err = si5341_encode_44_32(synth->data->regmap, 693 SI5341_SYNTH_N_NUM(index), n_num, n_den); 694 695 err = regmap_update_bits(synth->data->regmap, 696 SI5341_SYNTH_N_PIBYP, BIT(index), is_integer ? BIT(index) : 0); 697 if (err < 0) 698 return err; 699 700 return regmap_write(synth->data->regmap, 701 SI5341_SYNTH_N_UPD(index), 0x01); 702 } 703 704 705 static int si5341_synth_clk_set_rate(struct clk_hw *hw, unsigned long rate, 706 unsigned long parent_rate) 707 { 708 struct clk_si5341_synth *synth = to_clk_si5341_synth(hw); 709 u64 n_num; 710 u32 n_den; 711 u32 r; 712 u32 g; 713 bool is_integer; 714 715 n_num = synth->data->freq_vco; 716 717 /* see if there's an integer solution */ 718 r = do_div(n_num, rate); 719 is_integer = (r == 0); 720 if (is_integer) { 721 /* Integer divider equal to n_num */ 722 n_den = 1; 723 } else { 724 /* Calculate a fractional solution */ 725 g = gcd(r, rate); 726 n_den = rate / g; 727 n_num *= n_den; 728 n_num += r / g; 729 } 730 731 dev_dbg(&synth->data->i2c_client->dev, 732 "%s(%u): n=0x%llx d=0x%x %s\n", __func__, 733 synth->index, n_num, n_den, 734 is_integer ? "int" : "frac"); 735 736 return si5341_synth_program(synth, n_num, n_den, is_integer); 737 } 738 739 static const struct clk_ops si5341_synth_clk_ops = { 740 .is_prepared = si5341_synth_clk_is_on, 741 .prepare = si5341_synth_clk_prepare, 742 .unprepare = si5341_synth_clk_unprepare, 743 .recalc_rate = si5341_synth_clk_recalc_rate, 744 .round_rate = si5341_synth_clk_round_rate, 745 .set_rate = si5341_synth_clk_set_rate, 746 }; 747 748 static int si5341_output_clk_is_on(struct clk_hw *hw) 749 { 750 struct clk_si5341_output *output = to_clk_si5341_output(hw); 751 int err; 752 u32 val; 753 754 err = regmap_read(output->data->regmap, 755 SI5341_OUT_CONFIG(output), &val); 756 if (err < 0) 757 return err; 758 759 /* Bit 0=PDN, 1=OE so only a value of 0x2 enables the output */ 760 return (val & 0x03) == SI5341_OUT_CFG_OE; 761 } 762 763 /* Disables and then powers down the output */ 764 static void si5341_output_clk_unprepare(struct clk_hw *hw) 765 { 766 struct clk_si5341_output *output = to_clk_si5341_output(hw); 767 768 regmap_update_bits(output->data->regmap, 769 SI5341_OUT_CONFIG(output), 770 SI5341_OUT_CFG_OE, 0); 771 regmap_update_bits(output->data->regmap, 772 SI5341_OUT_CONFIG(output), 773 SI5341_OUT_CFG_PDN, SI5341_OUT_CFG_PDN); 774 } 775 776 /* Powers up and then enables the output */ 777 static int si5341_output_clk_prepare(struct clk_hw *hw) 778 { 779 struct clk_si5341_output *output = to_clk_si5341_output(hw); 780 int err; 781 782 err = regmap_update_bits(output->data->regmap, 783 SI5341_OUT_CONFIG(output), 784 SI5341_OUT_CFG_PDN, 0); 785 if (err < 0) 786 return err; 787 788 return regmap_update_bits(output->data->regmap, 789 SI5341_OUT_CONFIG(output), 790 SI5341_OUT_CFG_OE, SI5341_OUT_CFG_OE); 791 } 792 793 static unsigned long si5341_output_clk_recalc_rate(struct clk_hw *hw, 794 unsigned long parent_rate) 795 { 796 struct clk_si5341_output *output = to_clk_si5341_output(hw); 797 int err; 798 u32 val; 799 u32 r_divider; 800 u8 r[3]; 801 802 err = regmap_read(output->data->regmap, 803 SI5341_OUT_CONFIG(output), &val); 804 if (err < 0) 805 return err; 806 807 /* If SI5341_OUT_CFG_RDIV_FORCE2 is set, r_divider is 2 */ 808 if (val & SI5341_OUT_CFG_RDIV_FORCE2) 809 return parent_rate / 2; 810 811 err = regmap_bulk_read(output->data->regmap, 812 SI5341_OUT_R_REG(output), r, 3); 813 if (err < 0) 814 return err; 815 816 /* Calculate value as 24-bit integer*/ 817 r_divider = r[2] << 16 | r[1] << 8 | r[0]; 818 819 /* If Rx_REG is zero, the divider is disabled, so return a "0" rate */ 820 if (!r_divider) 821 return 0; 822 823 /* Divider is 2*(Rx_REG+1) */ 824 r_divider += 1; 825 r_divider <<= 1; 826 827 828 return parent_rate / r_divider; 829 } 830 831 static int si5341_output_clk_determine_rate(struct clk_hw *hw, 832 struct clk_rate_request *req) 833 { 834 unsigned long rate = req->rate; 835 unsigned long r; 836 837 if (!rate) 838 return 0; 839 840 r = req->best_parent_rate >> 1; 841 842 /* If rate is an even divisor, no changes to parent required */ 843 if (r && !(r % rate)) 844 return 0; 845 846 if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) { 847 if (rate > 200000000) { 848 /* minimum r-divider is 2 */ 849 r = 2; 850 } else { 851 /* Take a parent frequency near 400 MHz */ 852 r = (400000000u / rate) & ~1; 853 } 854 req->best_parent_rate = r * rate; 855 } else { 856 /* We cannot change our parent's rate, report what we can do */ 857 r /= rate; 858 rate = req->best_parent_rate / (r << 1); 859 } 860 861 req->rate = rate; 862 return 0; 863 } 864 865 static int si5341_output_clk_set_rate(struct clk_hw *hw, unsigned long rate, 866 unsigned long parent_rate) 867 { 868 struct clk_si5341_output *output = to_clk_si5341_output(hw); 869 u32 r_div; 870 int err; 871 u8 r[3]; 872 873 if (!rate) 874 return -EINVAL; 875 876 /* Frequency divider is (r_div + 1) * 2 */ 877 r_div = (parent_rate / rate) >> 1; 878 879 if (r_div <= 1) 880 r_div = 0; 881 else if (r_div >= BIT(24)) 882 r_div = BIT(24) - 1; 883 else 884 --r_div; 885 886 /* For a value of "2", we set the "OUT0_RDIV_FORCE2" bit */ 887 err = regmap_update_bits(output->data->regmap, 888 SI5341_OUT_CONFIG(output), 889 SI5341_OUT_CFG_RDIV_FORCE2, 890 (r_div == 0) ? SI5341_OUT_CFG_RDIV_FORCE2 : 0); 891 if (err < 0) 892 return err; 893 894 /* Always write Rx_REG, because a zero value disables the divider */ 895 r[0] = r_div ? (r_div & 0xff) : 1; 896 r[1] = (r_div >> 8) & 0xff; 897 r[2] = (r_div >> 16) & 0xff; 898 return regmap_bulk_write(output->data->regmap, 899 SI5341_OUT_R_REG(output), r, 3); 900 } 901 902 static int si5341_output_reparent(struct clk_si5341_output *output, u8 index) 903 { 904 return regmap_update_bits(output->data->regmap, 905 SI5341_OUT_MUX_SEL(output), 0x07, index); 906 } 907 908 static int si5341_output_set_parent(struct clk_hw *hw, u8 index) 909 { 910 struct clk_si5341_output *output = to_clk_si5341_output(hw); 911 912 if (index >= output->data->num_synth) 913 return -EINVAL; 914 915 return si5341_output_reparent(output, index); 916 } 917 918 static u8 si5341_output_get_parent(struct clk_hw *hw) 919 { 920 struct clk_si5341_output *output = to_clk_si5341_output(hw); 921 u32 val; 922 923 regmap_read(output->data->regmap, SI5341_OUT_MUX_SEL(output), &val); 924 925 return val & 0x7; 926 } 927 928 static const struct clk_ops si5341_output_clk_ops = { 929 .is_prepared = si5341_output_clk_is_on, 930 .prepare = si5341_output_clk_prepare, 931 .unprepare = si5341_output_clk_unprepare, 932 .recalc_rate = si5341_output_clk_recalc_rate, 933 .determine_rate = si5341_output_clk_determine_rate, 934 .set_rate = si5341_output_clk_set_rate, 935 .set_parent = si5341_output_set_parent, 936 .get_parent = si5341_output_get_parent, 937 }; 938 939 /* 940 * The chip can be bought in a pre-programmed version, or one can program the 941 * NVM in the chip to boot up in a preset mode. This routine tries to determine 942 * if that's the case, or if we need to reset and program everything from 943 * scratch. Returns negative error, or true/false. 944 */ 945 static int si5341_is_programmed_already(struct clk_si5341 *data) 946 { 947 int err; 948 u8 r[4]; 949 950 /* Read the PLL divider value, it must have a non-zero value */ 951 err = regmap_bulk_read(data->regmap, SI5341_PLL_M_DEN, 952 r, ARRAY_SIZE(r)); 953 if (err < 0) 954 return err; 955 956 return !!get_unaligned_le32(r); 957 } 958 959 static struct clk_hw * 960 of_clk_si5341_get(struct of_phandle_args *clkspec, void *_data) 961 { 962 struct clk_si5341 *data = _data; 963 unsigned int idx = clkspec->args[1]; 964 unsigned int group = clkspec->args[0]; 965 966 switch (group) { 967 case 0: 968 if (idx >= data->num_outputs) { 969 dev_err(&data->i2c_client->dev, 970 "invalid output index %u\n", idx); 971 return ERR_PTR(-EINVAL); 972 } 973 return &data->clk[idx].hw; 974 case 1: 975 if (idx >= data->num_synth) { 976 dev_err(&data->i2c_client->dev, 977 "invalid synthesizer index %u\n", idx); 978 return ERR_PTR(-EINVAL); 979 } 980 return &data->synth[idx].hw; 981 case 2: 982 if (idx > 0) { 983 dev_err(&data->i2c_client->dev, 984 "invalid PLL index %u\n", idx); 985 return ERR_PTR(-EINVAL); 986 } 987 return &data->hw; 988 default: 989 dev_err(&data->i2c_client->dev, "invalid group %u\n", group); 990 return ERR_PTR(-EINVAL); 991 } 992 } 993 994 static int si5341_probe_chip_id(struct clk_si5341 *data) 995 { 996 int err; 997 u8 reg[4]; 998 u16 model; 999 1000 err = regmap_bulk_read(data->regmap, SI5341_PN_BASE, reg, 1001 ARRAY_SIZE(reg)); 1002 if (err < 0) { 1003 dev_err(&data->i2c_client->dev, "Failed to read chip ID\n"); 1004 return err; 1005 } 1006 1007 model = get_unaligned_le16(reg); 1008 1009 dev_info(&data->i2c_client->dev, "Chip: %x Grade: %u Rev: %u\n", 1010 model, reg[2], reg[3]); 1011 1012 switch (model) { 1013 case 0x5340: 1014 data->num_outputs = SI5340_MAX_NUM_OUTPUTS; 1015 data->num_synth = SI5340_NUM_SYNTH; 1016 data->reg_output_offset = si5340_reg_output_offset; 1017 data->reg_rdiv_offset = si5340_reg_rdiv_offset; 1018 break; 1019 case 0x5341: 1020 data->num_outputs = SI5341_MAX_NUM_OUTPUTS; 1021 data->num_synth = SI5341_NUM_SYNTH; 1022 data->reg_output_offset = si5341_reg_output_offset; 1023 data->reg_rdiv_offset = si5341_reg_rdiv_offset; 1024 break; 1025 case 0x5342: 1026 data->num_outputs = SI5342_MAX_NUM_OUTPUTS; 1027 data->num_synth = SI5342_NUM_SYNTH; 1028 data->reg_output_offset = si5340_reg_output_offset; 1029 data->reg_rdiv_offset = si5340_reg_rdiv_offset; 1030 break; 1031 case 0x5344: 1032 data->num_outputs = SI5344_MAX_NUM_OUTPUTS; 1033 data->num_synth = SI5344_NUM_SYNTH; 1034 data->reg_output_offset = si5340_reg_output_offset; 1035 data->reg_rdiv_offset = si5340_reg_rdiv_offset; 1036 break; 1037 case 0x5345: 1038 data->num_outputs = SI5345_MAX_NUM_OUTPUTS; 1039 data->num_synth = SI5345_NUM_SYNTH; 1040 data->reg_output_offset = si5341_reg_output_offset; 1041 data->reg_rdiv_offset = si5341_reg_rdiv_offset; 1042 break; 1043 default: 1044 dev_err(&data->i2c_client->dev, "Model '%x' not supported\n", 1045 model); 1046 return -EINVAL; 1047 } 1048 1049 data->chip_id = model; 1050 1051 return 0; 1052 } 1053 1054 /* Read active settings into the regmap cache for later reference */ 1055 static int si5341_read_settings(struct clk_si5341 *data) 1056 { 1057 int err; 1058 u8 i; 1059 u8 r[10]; 1060 1061 err = regmap_bulk_read(data->regmap, SI5341_PLL_M_NUM, r, 10); 1062 if (err < 0) 1063 return err; 1064 1065 err = regmap_bulk_read(data->regmap, 1066 SI5341_SYNTH_N_CLK_TO_OUTX_EN, r, 3); 1067 if (err < 0) 1068 return err; 1069 1070 err = regmap_bulk_read(data->regmap, 1071 SI5341_SYNTH_N_CLK_DIS, r, 1); 1072 if (err < 0) 1073 return err; 1074 1075 for (i = 0; i < data->num_synth; ++i) { 1076 err = regmap_bulk_read(data->regmap, 1077 SI5341_SYNTH_N_NUM(i), r, 10); 1078 if (err < 0) 1079 return err; 1080 } 1081 1082 for (i = 0; i < data->num_outputs; ++i) { 1083 err = regmap_bulk_read(data->regmap, 1084 data->reg_output_offset[i], r, 4); 1085 if (err < 0) 1086 return err; 1087 1088 err = regmap_bulk_read(data->regmap, 1089 data->reg_rdiv_offset[i], r, 3); 1090 if (err < 0) 1091 return err; 1092 } 1093 1094 return 0; 1095 } 1096 1097 static int si5341_write_multiple(struct clk_si5341 *data, 1098 const struct si5341_reg_default *values, unsigned int num_values) 1099 { 1100 unsigned int i; 1101 int res; 1102 1103 for (i = 0; i < num_values; ++i) { 1104 res = regmap_write(data->regmap, 1105 values[i].address, values[i].value); 1106 if (res < 0) { 1107 dev_err(&data->i2c_client->dev, 1108 "Failed to write %#x:%#x\n", 1109 values[i].address, values[i].value); 1110 return res; 1111 } 1112 } 1113 1114 return 0; 1115 } 1116 1117 static const struct si5341_reg_default si5341_preamble[] = { 1118 { 0x0B25, 0x00 }, 1119 { 0x0502, 0x01 }, 1120 { 0x0505, 0x03 }, 1121 { 0x0957, 0x17 }, 1122 { 0x0B4E, 0x1A }, 1123 }; 1124 1125 static const struct si5341_reg_default si5345_preamble[] = { 1126 { 0x0B25, 0x00 }, 1127 { 0x0540, 0x01 }, 1128 }; 1129 1130 static int si5341_send_preamble(struct clk_si5341 *data) 1131 { 1132 int res; 1133 u32 revision; 1134 1135 /* For revision 2 and up, the values are slightly different */ 1136 res = regmap_read(data->regmap, SI5341_DEVICE_REV, &revision); 1137 if (res < 0) 1138 return res; 1139 1140 /* Write "preamble" as specified by datasheet */ 1141 res = regmap_write(data->regmap, 0xB24, revision < 2 ? 0xD8 : 0xC0); 1142 if (res < 0) 1143 return res; 1144 1145 /* The si5342..si5345 require a different preamble */ 1146 if (data->chip_id > 0x5341) 1147 res = si5341_write_multiple(data, 1148 si5345_preamble, ARRAY_SIZE(si5345_preamble)); 1149 else 1150 res = si5341_write_multiple(data, 1151 si5341_preamble, ARRAY_SIZE(si5341_preamble)); 1152 if (res < 0) 1153 return res; 1154 1155 /* Datasheet specifies a 300ms wait after sending the preamble */ 1156 msleep(300); 1157 1158 return 0; 1159 } 1160 1161 /* Perform a soft reset and write post-amble */ 1162 static int si5341_finalize_defaults(struct clk_si5341 *data) 1163 { 1164 int res; 1165 u32 revision; 1166 1167 res = regmap_write(data->regmap, SI5341_IO_VDD_SEL, 1168 data->iovdd_33 ? 1 : 0); 1169 if (res < 0) 1170 return res; 1171 1172 res = regmap_read(data->regmap, SI5341_DEVICE_REV, &revision); 1173 if (res < 0) 1174 return res; 1175 1176 dev_dbg(&data->i2c_client->dev, "%s rev=%u\n", __func__, revision); 1177 1178 res = regmap_write(data->regmap, SI5341_SOFT_RST, 0x01); 1179 if (res < 0) 1180 return res; 1181 1182 /* The si5342..si5345 have an additional post-amble */ 1183 if (data->chip_id > 0x5341) { 1184 res = regmap_write(data->regmap, 0x540, 0x0); 1185 if (res < 0) 1186 return res; 1187 } 1188 1189 /* Datasheet does not explain these nameless registers */ 1190 res = regmap_write(data->regmap, 0xB24, revision < 2 ? 0xDB : 0xC3); 1191 if (res < 0) 1192 return res; 1193 res = regmap_write(data->regmap, 0x0B25, 0x02); 1194 if (res < 0) 1195 return res; 1196 1197 return 0; 1198 } 1199 1200 1201 static const struct regmap_range si5341_regmap_volatile_range[] = { 1202 regmap_reg_range(0x000C, 0x0012), /* Status */ 1203 regmap_reg_range(0x001C, 0x001E), /* reset, finc/fdec */ 1204 regmap_reg_range(0x00E2, 0x00FE), /* NVM, interrupts, device ready */ 1205 /* Update bits for P divider and synth config */ 1206 regmap_reg_range(SI5341_PX_UPD, SI5341_PX_UPD), 1207 regmap_reg_range(SI5341_SYNTH_N_UPD(0), SI5341_SYNTH_N_UPD(0)), 1208 regmap_reg_range(SI5341_SYNTH_N_UPD(1), SI5341_SYNTH_N_UPD(1)), 1209 regmap_reg_range(SI5341_SYNTH_N_UPD(2), SI5341_SYNTH_N_UPD(2)), 1210 regmap_reg_range(SI5341_SYNTH_N_UPD(3), SI5341_SYNTH_N_UPD(3)), 1211 regmap_reg_range(SI5341_SYNTH_N_UPD(4), SI5341_SYNTH_N_UPD(4)), 1212 }; 1213 1214 static const struct regmap_access_table si5341_regmap_volatile = { 1215 .yes_ranges = si5341_regmap_volatile_range, 1216 .n_yes_ranges = ARRAY_SIZE(si5341_regmap_volatile_range), 1217 }; 1218 1219 /* Pages 0, 1, 2, 3, 9, A, B are valid, so there are 12 pages */ 1220 static const struct regmap_range_cfg si5341_regmap_ranges[] = { 1221 { 1222 .range_min = 0, 1223 .range_max = SI5341_REGISTER_MAX, 1224 .selector_reg = SI5341_PAGE, 1225 .selector_mask = 0xff, 1226 .selector_shift = 0, 1227 .window_start = 0, 1228 .window_len = 256, 1229 }, 1230 }; 1231 1232 static int si5341_wait_device_ready(struct i2c_client *client) 1233 { 1234 int count; 1235 1236 /* Datasheet warns: Any attempt to read or write any register other 1237 * than DEVICE_READY before DEVICE_READY reads as 0x0F may corrupt the 1238 * NVM programming and may corrupt the register contents, as they are 1239 * read from NVM. Note that this includes accesses to the PAGE register. 1240 * Also: DEVICE_READY is available on every register page, so no page 1241 * change is needed to read it. 1242 * Do this outside regmap to avoid automatic PAGE register access. 1243 * May take up to 300ms to complete. 1244 */ 1245 for (count = 0; count < 15; ++count) { 1246 s32 result = i2c_smbus_read_byte_data(client, 1247 SI5341_DEVICE_READY); 1248 if (result < 0) 1249 return result; 1250 if (result == 0x0F) 1251 return 0; 1252 msleep(20); 1253 } 1254 dev_err(&client->dev, "timeout waiting for DEVICE_READY\n"); 1255 return -EIO; 1256 } 1257 1258 static const struct regmap_config si5341_regmap_config = { 1259 .reg_bits = 8, 1260 .val_bits = 8, 1261 .cache_type = REGCACHE_MAPLE, 1262 .ranges = si5341_regmap_ranges, 1263 .num_ranges = ARRAY_SIZE(si5341_regmap_ranges), 1264 .max_register = SI5341_REGISTER_MAX, 1265 .volatile_table = &si5341_regmap_volatile, 1266 }; 1267 1268 static int si5341_dt_parse_dt(struct clk_si5341 *data, 1269 struct clk_si5341_output_config *config) 1270 { 1271 struct device_node *child; 1272 struct device_node *np = data->i2c_client->dev.of_node; 1273 u32 num; 1274 u32 val; 1275 1276 memset(config, 0, sizeof(struct clk_si5341_output_config) * 1277 SI5341_MAX_NUM_OUTPUTS); 1278 1279 for_each_child_of_node(np, child) { 1280 if (of_property_read_u32(child, "reg", &num)) { 1281 dev_err(&data->i2c_client->dev, "missing reg property of %s\n", 1282 child->name); 1283 goto put_child; 1284 } 1285 1286 if (num >= SI5341_MAX_NUM_OUTPUTS) { 1287 dev_err(&data->i2c_client->dev, "invalid clkout %d\n", num); 1288 goto put_child; 1289 } 1290 1291 if (!of_property_read_u32(child, "silabs,format", &val)) { 1292 /* Set cm and ampl conservatively to 3v3 settings */ 1293 switch (val) { 1294 case 1: /* normal differential */ 1295 config[num].out_cm_ampl_bits = 0x33; 1296 break; 1297 case 2: /* low-power differential */ 1298 config[num].out_cm_ampl_bits = 0x13; 1299 break; 1300 case 4: /* LVCMOS */ 1301 config[num].out_cm_ampl_bits = 0x33; 1302 /* Set SI recommended impedance for LVCMOS */ 1303 config[num].out_format_drv_bits |= 0xc0; 1304 break; 1305 default: 1306 dev_err(&data->i2c_client->dev, 1307 "invalid silabs,format %u for %u\n", 1308 val, num); 1309 goto put_child; 1310 } 1311 config[num].out_format_drv_bits &= ~0x07; 1312 config[num].out_format_drv_bits |= val & 0x07; 1313 /* Always enable the SYNC feature */ 1314 config[num].out_format_drv_bits |= 0x08; 1315 } 1316 1317 if (!of_property_read_u32(child, "silabs,common-mode", &val)) { 1318 if (val > 0xf) { 1319 dev_err(&data->i2c_client->dev, 1320 "invalid silabs,common-mode %u\n", 1321 val); 1322 goto put_child; 1323 } 1324 config[num].out_cm_ampl_bits &= 0xf0; 1325 config[num].out_cm_ampl_bits |= val & 0x0f; 1326 } 1327 1328 if (!of_property_read_u32(child, "silabs,amplitude", &val)) { 1329 if (val > 0xf) { 1330 dev_err(&data->i2c_client->dev, 1331 "invalid silabs,amplitude %u\n", 1332 val); 1333 goto put_child; 1334 } 1335 config[num].out_cm_ampl_bits &= 0x0f; 1336 config[num].out_cm_ampl_bits |= (val << 4) & 0xf0; 1337 } 1338 1339 if (of_property_read_bool(child, "silabs,disable-high")) 1340 config[num].out_format_drv_bits |= 0x10; 1341 1342 config[num].synth_master = 1343 of_property_read_bool(child, "silabs,synth-master"); 1344 1345 config[num].always_on = 1346 of_property_read_bool(child, "always-on"); 1347 1348 config[num].vdd_sel_bits = 0x08; 1349 if (data->clk[num].vddo_reg) { 1350 int vdd = regulator_get_voltage(data->clk[num].vddo_reg); 1351 1352 switch (vdd) { 1353 case 3300000: 1354 config[num].vdd_sel_bits |= 0 << 4; 1355 break; 1356 case 1800000: 1357 config[num].vdd_sel_bits |= 1 << 4; 1358 break; 1359 case 2500000: 1360 config[num].vdd_sel_bits |= 2 << 4; 1361 break; 1362 default: 1363 dev_err(&data->i2c_client->dev, 1364 "unsupported vddo voltage %d for %s\n", 1365 vdd, child->name); 1366 goto put_child; 1367 } 1368 } else { 1369 /* chip seems to default to 2.5V when not set */ 1370 dev_warn(&data->i2c_client->dev, 1371 "no regulator set, defaulting vdd_sel to 2.5V for %s\n", 1372 child->name); 1373 config[num].vdd_sel_bits |= 2 << 4; 1374 } 1375 } 1376 1377 return 0; 1378 1379 put_child: 1380 of_node_put(child); 1381 return -EINVAL; 1382 } 1383 1384 /* 1385 * If not pre-configured, calculate and set the PLL configuration manually. 1386 * For low-jitter performance, the PLL should be set such that the synthesizers 1387 * only need integer division. 1388 * Without any user guidance, we'll set the PLL to 14GHz, which still allows 1389 * the chip to generate any frequency on its outputs, but jitter performance 1390 * may be sub-optimal. 1391 */ 1392 static int si5341_initialize_pll(struct clk_si5341 *data) 1393 { 1394 struct device_node *np = data->i2c_client->dev.of_node; 1395 u32 m_num = 0; 1396 u32 m_den = 0; 1397 int sel; 1398 1399 if (of_property_read_u32(np, "silabs,pll-m-num", &m_num)) { 1400 dev_err(&data->i2c_client->dev, 1401 "PLL configuration requires silabs,pll-m-num\n"); 1402 } 1403 if (of_property_read_u32(np, "silabs,pll-m-den", &m_den)) { 1404 dev_err(&data->i2c_client->dev, 1405 "PLL configuration requires silabs,pll-m-den\n"); 1406 } 1407 1408 if (!m_num || !m_den) { 1409 dev_err(&data->i2c_client->dev, 1410 "PLL configuration invalid, assume 14GHz\n"); 1411 sel = si5341_clk_get_selected_input(data); 1412 if (sel < 0) 1413 return sel; 1414 1415 m_den = clk_get_rate(data->input_clk[sel]) / 10; 1416 m_num = 1400000000; 1417 } 1418 1419 return si5341_encode_44_32(data->regmap, 1420 SI5341_PLL_M_NUM, m_num, m_den); 1421 } 1422 1423 static int si5341_clk_select_active_input(struct clk_si5341 *data) 1424 { 1425 int res; 1426 int err; 1427 int i; 1428 1429 res = si5341_clk_get_selected_input(data); 1430 if (res < 0) 1431 return res; 1432 1433 /* If the current register setting is invalid, pick the first input */ 1434 if (!data->input_clk[res]) { 1435 dev_dbg(&data->i2c_client->dev, 1436 "Input %d not connected, rerouting\n", res); 1437 res = -ENODEV; 1438 for (i = 0; i < SI5341_NUM_INPUTS; ++i) { 1439 if (data->input_clk[i]) { 1440 res = i; 1441 break; 1442 } 1443 } 1444 if (res < 0) { 1445 dev_err(&data->i2c_client->dev, 1446 "No clock input available\n"); 1447 return res; 1448 } 1449 } 1450 1451 /* Make sure the selected clock is also enabled and routed */ 1452 err = si5341_clk_reparent(data, res); 1453 if (err < 0) 1454 return err; 1455 1456 err = clk_prepare_enable(data->input_clk[res]); 1457 if (err < 0) 1458 return err; 1459 1460 return res; 1461 } 1462 1463 static ssize_t input_present_show(struct device *dev, 1464 struct device_attribute *attr, 1465 char *buf) 1466 { 1467 struct clk_si5341 *data = dev_get_drvdata(dev); 1468 u32 status; 1469 int res = regmap_read(data->regmap, SI5341_STATUS, &status); 1470 1471 if (res < 0) 1472 return res; 1473 res = !(status & SI5341_STATUS_LOSREF); 1474 return sysfs_emit(buf, "%d\n", res); 1475 } 1476 static DEVICE_ATTR_RO(input_present); 1477 1478 static ssize_t input_present_sticky_show(struct device *dev, 1479 struct device_attribute *attr, 1480 char *buf) 1481 { 1482 struct clk_si5341 *data = dev_get_drvdata(dev); 1483 u32 status; 1484 int res = regmap_read(data->regmap, SI5341_STATUS_STICKY, &status); 1485 1486 if (res < 0) 1487 return res; 1488 res = !(status & SI5341_STATUS_LOSREF); 1489 return sysfs_emit(buf, "%d\n", res); 1490 } 1491 static DEVICE_ATTR_RO(input_present_sticky); 1492 1493 static ssize_t pll_locked_show(struct device *dev, 1494 struct device_attribute *attr, 1495 char *buf) 1496 { 1497 struct clk_si5341 *data = dev_get_drvdata(dev); 1498 u32 status; 1499 int res = regmap_read(data->regmap, SI5341_STATUS, &status); 1500 1501 if (res < 0) 1502 return res; 1503 res = !(status & SI5341_STATUS_LOL); 1504 return sysfs_emit(buf, "%d\n", res); 1505 } 1506 static DEVICE_ATTR_RO(pll_locked); 1507 1508 static ssize_t pll_locked_sticky_show(struct device *dev, 1509 struct device_attribute *attr, 1510 char *buf) 1511 { 1512 struct clk_si5341 *data = dev_get_drvdata(dev); 1513 u32 status; 1514 int res = regmap_read(data->regmap, SI5341_STATUS_STICKY, &status); 1515 1516 if (res < 0) 1517 return res; 1518 res = !(status & SI5341_STATUS_LOL); 1519 return sysfs_emit(buf, "%d\n", res); 1520 } 1521 static DEVICE_ATTR_RO(pll_locked_sticky); 1522 1523 static ssize_t clear_sticky_store(struct device *dev, 1524 struct device_attribute *attr, 1525 const char *buf, size_t count) 1526 { 1527 struct clk_si5341 *data = dev_get_drvdata(dev); 1528 long val; 1529 1530 if (kstrtol(buf, 10, &val)) 1531 return -EINVAL; 1532 if (val) { 1533 int res = regmap_write(data->regmap, SI5341_STATUS_STICKY, 0); 1534 1535 if (res < 0) 1536 return res; 1537 } 1538 return count; 1539 } 1540 static DEVICE_ATTR_WO(clear_sticky); 1541 1542 static const struct attribute *si5341_attributes[] = { 1543 &dev_attr_input_present.attr, 1544 &dev_attr_input_present_sticky.attr, 1545 &dev_attr_pll_locked.attr, 1546 &dev_attr_pll_locked_sticky.attr, 1547 &dev_attr_clear_sticky.attr, 1548 NULL 1549 }; 1550 1551 static int si5341_probe(struct i2c_client *client) 1552 { 1553 struct clk_si5341 *data; 1554 struct clk_init_data init; 1555 struct clk *input; 1556 const char *root_clock_name; 1557 const char *synth_clock_names[SI5341_NUM_SYNTH] = { NULL }; 1558 int err; 1559 unsigned int i; 1560 struct clk_si5341_output_config config[SI5341_MAX_NUM_OUTPUTS]; 1561 bool initialization_required; 1562 u32 status; 1563 1564 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); 1565 if (!data) 1566 return -ENOMEM; 1567 1568 data->i2c_client = client; 1569 1570 /* Must be done before otherwise touching hardware */ 1571 err = si5341_wait_device_ready(client); 1572 if (err) 1573 return err; 1574 1575 for (i = 0; i < SI5341_NUM_INPUTS; ++i) { 1576 input = devm_clk_get(&client->dev, si5341_input_clock_names[i]); 1577 if (IS_ERR(input)) { 1578 if (PTR_ERR(input) == -EPROBE_DEFER) 1579 return -EPROBE_DEFER; 1580 data->input_clk_name[i] = si5341_input_clock_names[i]; 1581 } else { 1582 data->input_clk[i] = input; 1583 data->input_clk_name[i] = __clk_get_name(input); 1584 } 1585 } 1586 1587 for (i = 0; i < SI5341_MAX_NUM_OUTPUTS; ++i) { 1588 char reg_name[10]; 1589 1590 snprintf(reg_name, sizeof(reg_name), "vddo%d", i); 1591 data->clk[i].vddo_reg = devm_regulator_get_optional( 1592 &client->dev, reg_name); 1593 if (IS_ERR(data->clk[i].vddo_reg)) { 1594 err = PTR_ERR(data->clk[i].vddo_reg); 1595 data->clk[i].vddo_reg = NULL; 1596 if (err == -ENODEV) 1597 continue; 1598 goto cleanup; 1599 } else { 1600 err = regulator_enable(data->clk[i].vddo_reg); 1601 if (err) { 1602 dev_err(&client->dev, 1603 "failed to enable %s regulator: %d\n", 1604 reg_name, err); 1605 data->clk[i].vddo_reg = NULL; 1606 goto cleanup; 1607 } 1608 } 1609 } 1610 1611 err = si5341_dt_parse_dt(data, config); 1612 if (err) 1613 goto cleanup; 1614 1615 if (of_property_read_string(client->dev.of_node, "clock-output-names", 1616 &init.name)) 1617 init.name = client->dev.of_node->name; 1618 root_clock_name = init.name; 1619 1620 data->regmap = devm_regmap_init_i2c(client, &si5341_regmap_config); 1621 if (IS_ERR(data->regmap)) { 1622 err = PTR_ERR(data->regmap); 1623 goto cleanup; 1624 } 1625 1626 i2c_set_clientdata(client, data); 1627 1628 err = si5341_probe_chip_id(data); 1629 if (err < 0) 1630 goto cleanup; 1631 1632 if (of_property_read_bool(client->dev.of_node, "silabs,reprogram")) { 1633 initialization_required = true; 1634 } else { 1635 err = si5341_is_programmed_already(data); 1636 if (err < 0) 1637 goto cleanup; 1638 1639 initialization_required = !err; 1640 } 1641 data->xaxb_ext_clk = of_property_read_bool(client->dev.of_node, 1642 "silabs,xaxb-ext-clk"); 1643 data->iovdd_33 = of_property_read_bool(client->dev.of_node, 1644 "silabs,iovdd-33"); 1645 1646 if (initialization_required) { 1647 /* Populate the regmap cache in preparation for "cache only" */ 1648 err = si5341_read_settings(data); 1649 if (err < 0) 1650 goto cleanup; 1651 1652 err = si5341_send_preamble(data); 1653 if (err < 0) 1654 goto cleanup; 1655 1656 /* 1657 * We intend to send all 'final' register values in a single 1658 * transaction. So cache all register writes until we're done 1659 * configuring. 1660 */ 1661 regcache_cache_only(data->regmap, true); 1662 1663 /* Write the configuration pairs from the firmware blob */ 1664 err = si5341_write_multiple(data, si5341_reg_defaults, 1665 ARRAY_SIZE(si5341_reg_defaults)); 1666 if (err < 0) 1667 goto cleanup; 1668 } 1669 1670 /* Input must be up and running at this point */ 1671 err = si5341_clk_select_active_input(data); 1672 if (err < 0) 1673 goto cleanup; 1674 1675 if (initialization_required) { 1676 /* PLL configuration is required */ 1677 err = si5341_initialize_pll(data); 1678 if (err < 0) 1679 goto cleanup; 1680 } 1681 1682 /* Register the PLL */ 1683 init.parent_names = data->input_clk_name; 1684 init.num_parents = SI5341_NUM_INPUTS; 1685 init.ops = &si5341_clk_ops; 1686 init.flags = 0; 1687 data->hw.init = &init; 1688 1689 err = devm_clk_hw_register(&client->dev, &data->hw); 1690 if (err) { 1691 dev_err(&client->dev, "clock registration failed\n"); 1692 goto cleanup; 1693 } 1694 1695 init.num_parents = 1; 1696 init.parent_names = &root_clock_name; 1697 init.ops = &si5341_synth_clk_ops; 1698 for (i = 0; i < data->num_synth; ++i) { 1699 synth_clock_names[i] = devm_kasprintf(&client->dev, GFP_KERNEL, 1700 "%s.N%u", client->dev.of_node->name, i); 1701 if (!synth_clock_names[i]) { 1702 err = -ENOMEM; 1703 goto free_clk_names; 1704 } 1705 init.name = synth_clock_names[i]; 1706 data->synth[i].index = i; 1707 data->synth[i].data = data; 1708 data->synth[i].hw.init = &init; 1709 err = devm_clk_hw_register(&client->dev, &data->synth[i].hw); 1710 if (err) { 1711 dev_err(&client->dev, 1712 "synth N%u registration failed\n", i); 1713 goto free_clk_names; 1714 } 1715 } 1716 1717 init.num_parents = data->num_synth; 1718 init.parent_names = synth_clock_names; 1719 init.ops = &si5341_output_clk_ops; 1720 for (i = 0; i < data->num_outputs; ++i) { 1721 init.name = kasprintf(GFP_KERNEL, "%s.%d", 1722 client->dev.of_node->name, i); 1723 if (!init.name) { 1724 err = -ENOMEM; 1725 goto free_clk_names; 1726 } 1727 init.flags = config[i].synth_master ? CLK_SET_RATE_PARENT : 0; 1728 data->clk[i].index = i; 1729 data->clk[i].data = data; 1730 data->clk[i].hw.init = &init; 1731 if (config[i].out_format_drv_bits & 0x07) { 1732 regmap_write(data->regmap, 1733 SI5341_OUT_FORMAT(&data->clk[i]), 1734 config[i].out_format_drv_bits); 1735 regmap_write(data->regmap, 1736 SI5341_OUT_CM(&data->clk[i]), 1737 config[i].out_cm_ampl_bits); 1738 regmap_update_bits(data->regmap, 1739 SI5341_OUT_MUX_SEL(&data->clk[i]), 1740 SI5341_OUT_MUX_VDD_SEL_MASK, 1741 config[i].vdd_sel_bits); 1742 } 1743 err = devm_clk_hw_register(&client->dev, &data->clk[i].hw); 1744 kfree(init.name); /* clock framework made a copy of the name */ 1745 if (err) { 1746 dev_err(&client->dev, 1747 "output %u registration failed\n", i); 1748 goto free_clk_names; 1749 } 1750 if (config[i].always_on) 1751 clk_prepare(data->clk[i].hw.clk); 1752 } 1753 1754 err = devm_of_clk_add_hw_provider(&client->dev, of_clk_si5341_get, 1755 data); 1756 if (err) { 1757 dev_err(&client->dev, "unable to add clk provider\n"); 1758 goto free_clk_names; 1759 } 1760 1761 if (initialization_required) { 1762 /* Synchronize */ 1763 regcache_cache_only(data->regmap, false); 1764 err = regcache_sync(data->regmap); 1765 if (err < 0) 1766 goto free_clk_names; 1767 1768 err = si5341_finalize_defaults(data); 1769 if (err < 0) 1770 goto free_clk_names; 1771 } 1772 1773 /* wait for device to report input clock present and PLL lock */ 1774 err = regmap_read_poll_timeout(data->regmap, SI5341_STATUS, status, 1775 !(status & (SI5341_STATUS_LOSREF | SI5341_STATUS_LOL)), 1776 10000, 250000); 1777 if (err) { 1778 dev_err(&client->dev, "Error waiting for input clock or PLL lock\n"); 1779 goto free_clk_names; 1780 } 1781 1782 /* clear sticky alarm bits from initialization */ 1783 err = regmap_write(data->regmap, SI5341_STATUS_STICKY, 0); 1784 if (err) { 1785 dev_err(&client->dev, "unable to clear sticky status\n"); 1786 goto free_clk_names; 1787 } 1788 1789 err = sysfs_create_files(&client->dev.kobj, si5341_attributes); 1790 if (err) 1791 dev_err(&client->dev, "unable to create sysfs files\n"); 1792 1793 free_clk_names: 1794 /* Free the names, clk framework makes copies */ 1795 for (i = 0; i < data->num_synth; ++i) 1796 devm_kfree(&client->dev, (void *)synth_clock_names[i]); 1797 1798 cleanup: 1799 if (err) { 1800 for (i = 0; i < SI5341_MAX_NUM_OUTPUTS; ++i) { 1801 if (data->clk[i].vddo_reg) 1802 regulator_disable(data->clk[i].vddo_reg); 1803 } 1804 } 1805 return err; 1806 } 1807 1808 static void si5341_remove(struct i2c_client *client) 1809 { 1810 struct clk_si5341 *data = i2c_get_clientdata(client); 1811 int i; 1812 1813 sysfs_remove_files(&client->dev.kobj, si5341_attributes); 1814 1815 for (i = 0; i < SI5341_MAX_NUM_OUTPUTS; ++i) { 1816 if (data->clk[i].vddo_reg) 1817 regulator_disable(data->clk[i].vddo_reg); 1818 } 1819 } 1820 1821 static const struct i2c_device_id si5341_id[] = { 1822 { "si5340", 0 }, 1823 { "si5341", 1 }, 1824 { "si5342", 2 }, 1825 { "si5344", 4 }, 1826 { "si5345", 5 }, 1827 { } 1828 }; 1829 MODULE_DEVICE_TABLE(i2c, si5341_id); 1830 1831 static const struct of_device_id clk_si5341_of_match[] = { 1832 { .compatible = "silabs,si5340" }, 1833 { .compatible = "silabs,si5341" }, 1834 { .compatible = "silabs,si5342" }, 1835 { .compatible = "silabs,si5344" }, 1836 { .compatible = "silabs,si5345" }, 1837 { } 1838 }; 1839 MODULE_DEVICE_TABLE(of, clk_si5341_of_match); 1840 1841 static struct i2c_driver si5341_driver = { 1842 .driver = { 1843 .name = "si5341", 1844 .of_match_table = clk_si5341_of_match, 1845 }, 1846 .probe = si5341_probe, 1847 .remove = si5341_remove, 1848 .id_table = si5341_id, 1849 }; 1850 module_i2c_driver(si5341_driver); 1851 1852 MODULE_AUTHOR("Mike Looijmans <mike.looijmans@topic.nl>"); 1853 MODULE_DESCRIPTION("Si5341 driver"); 1854 MODULE_LICENSE("GPL"); 1855