drivers/clk/clk-si5351.c

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This source file includes following definitions.
si5351_reg_read
si5351_bulk_read
si5351_reg_write
si5351_bulk_write
si5351_set_bits
si5351_msynth_params_address
si5351_read_parameters
si5351_write_parameters
si5351_regmap_is_volatile
si5351_regmap_is_writeable
si5351_xtal_prepare
si5351_xtal_unprepare
si5351_clkin_prepare
si5351_clkin_unprepare
si5351_clkin_recalc_rate
si5351_vxco_prepare
si5351_vxco_unprepare
si5351_vxco_recalc_rate
si5351_vxco_set_rate
_si5351_pll_reparent
si5351_pll_get_parent
si5351_pll_set_parent
si5351_pll_recalc_rate
si5351_pll_round_rate
si5351_pll_set_rate
_si5351_msynth_reparent
si5351_msynth_get_parent
si5351_msynth_set_parent
si5351_msynth_recalc_rate
si5351_msynth_round_rate
si5351_msynth_set_rate
_si5351_clkout_reparent
_si5351_clkout_set_drive_strength
_si5351_clkout_set_disable_state
_si5351_clkout_reset_pll
si5351_clkout_prepare
si5351_clkout_unprepare
si5351_clkout_get_parent
si5351_clkout_set_parent
si5351_clkout_recalc_rate
si5351_clkout_round_rate
si5351_clkout_set_rate
si5351_dt_parse
si53351_of_clk_get
si5351_dt_parse
si53351_of_clk_get
si5351_i2c_probe
si5351_i2c_remove
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * clk-si5351.c: Silicon Laboratories 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  *     http://www.silabs.com/Support%20Documents/TechnicalDocs/Si5351.pdf
  11  * [2] "Manually Generating an Si5351 Register Map"
  12  *     http://www.silabs.com/Support%20Documents/TechnicalDocs/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_platform.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 long si5351_pll_round_rate(struct clk_hw *hw, unsigned long rate,
 446                                   unsigned long *parent_rate)
 447 {
 448         struct si5351_hw_data *hwdata =
 449                 container_of(hw, struct si5351_hw_data, hw);
 450         unsigned long rfrac, denom, a, b, c;
 451         unsigned long long lltmp;
 452 
 453         if (rate < SI5351_PLL_VCO_MIN)
 454                 rate = SI5351_PLL_VCO_MIN;
 455         if (rate > SI5351_PLL_VCO_MAX)
 456                 rate = SI5351_PLL_VCO_MAX;
 457 
 458         /* determine integer part of feedback equation */
 459         a = rate / *parent_rate;
 460 
 461         if (a < SI5351_PLL_A_MIN)
 462                 rate = *parent_rate * SI5351_PLL_A_MIN;
 463         if (a > SI5351_PLL_A_MAX)
 464                 rate = *parent_rate * SI5351_PLL_A_MAX;
 465 
 466         /* find best approximation for b/c = fVCO mod fIN */
 467         denom = 1000 * 1000;
 468         lltmp = rate % (*parent_rate);
 469         lltmp *= denom;
 470         do_div(lltmp, *parent_rate);
 471         rfrac = (unsigned long)lltmp;
 472 
 473         b = 0;
 474         c = 1;
 475         if (rfrac)
 476                 rational_best_approximation(rfrac, denom,
 477                                     SI5351_PLL_B_MAX, SI5351_PLL_C_MAX, &b, &c);
 478 
 479         /* calculate parameters */
 480         hwdata->params.p3  = c;
 481         hwdata->params.p2  = (128 * b) % c;
 482         hwdata->params.p1  = 128 * a;
 483         hwdata->params.p1 += (128 * b / c);
 484         hwdata->params.p1 -= 512;
 485 
 486         /* recalculate rate by fIN * (a + b/c) */
 487         lltmp  = *parent_rate;
 488         lltmp *= b;
 489         do_div(lltmp, c);
 490 
 491         rate  = (unsigned long)lltmp;
 492         rate += *parent_rate * a;
 493 
 494         dev_dbg(&hwdata->drvdata->client->dev,
 495                 "%s - %s: a = %lu, b = %lu, c = %lu, parent_rate = %lu, rate = %lu\n",
 496                 __func__, clk_hw_get_name(hw), a, b, c,
 497                 *parent_rate, rate);
 498 
 499         return rate;
 500 }
 501 
 502 static int si5351_pll_set_rate(struct clk_hw *hw, unsigned long rate,
 503                                unsigned long parent_rate)
 504 {
 505         struct si5351_hw_data *hwdata =
 506                 container_of(hw, struct si5351_hw_data, hw);
 507         u8 reg = (hwdata->num == 0) ? SI5351_PLLA_PARAMETERS :
 508                 SI5351_PLLB_PARAMETERS;
 509 
 510         /* write multisynth parameters */
 511         si5351_write_parameters(hwdata->drvdata, reg, &hwdata->params);
 512 
 513         /* plla/pllb ctrl is in clk6/clk7 ctrl registers */
 514         si5351_set_bits(hwdata->drvdata, SI5351_CLK6_CTRL + hwdata->num,
 515                 SI5351_CLK_INTEGER_MODE,
 516                 (hwdata->params.p2 == 0) ? SI5351_CLK_INTEGER_MODE : 0);
 517 
 518         /* Do a pll soft reset on the affected pll */
 519         si5351_reg_write(hwdata->drvdata, SI5351_PLL_RESET,
 520                          hwdata->num == 0 ? SI5351_PLL_RESET_A :
 521                                             SI5351_PLL_RESET_B);
 522 
 523         dev_dbg(&hwdata->drvdata->client->dev,
 524                 "%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, parent_rate = %lu, rate = %lu\n",
 525                 __func__, clk_hw_get_name(hw),
 526                 hwdata->params.p1, hwdata->params.p2, hwdata->params.p3,
 527                 parent_rate, rate);
 528 
 529         return 0;
 530 }
 531 
 532 static const struct clk_ops si5351_pll_ops = {
 533         .set_parent = si5351_pll_set_parent,
 534         .get_parent = si5351_pll_get_parent,
 535         .recalc_rate = si5351_pll_recalc_rate,
 536         .round_rate = si5351_pll_round_rate,
 537         .set_rate = si5351_pll_set_rate,
 538 };
 539 
 540 /*
 541  * Si5351 multisync divider
 542  *
 543  * for fOUT <= 150 MHz:
 544  *
 545  * fOUT = (fIN * (a + b/c)) / CLKOUTDIV
 546  *
 547  * with 6 + 0/1048575 <= (a + b/c) <= 1800 + 0/1048575 and
 548  * fIN = fVCO0, fVCO1
 549  *
 550  * Output Clock Multisynth Register Equations
 551  *
 552  * MSx_P1[17:0] = 128 * a + floor(128 * b/c) - 512
 553  * MSx_P2[19:0] = 128 * b - c * floor(128 * b/c) = (128*b) mod c
 554  * MSx_P3[19:0] = c
 555  *
 556  * MS[6,7] are integer (P1) divide only, P1 = divide value,
 557  * P2 and P3 are not applicable
 558  *
 559  * for 150MHz < fOUT <= 160MHz:
 560  *
 561  * MSx_P1 = 0, MSx_P2 = 0, MSx_P3 = 1, MSx_INT = 1, MSx_DIVBY4 = 11b
 562  */
 563 static int _si5351_msynth_reparent(struct si5351_driver_data *drvdata,
 564                                    int num, enum si5351_multisynth_src parent)
 565 {
 566         if (parent == SI5351_MULTISYNTH_SRC_DEFAULT)
 567                 return 0;
 568 
 569         if (num > 8)
 570                 return -EINVAL;
 571 
 572         si5351_set_bits(drvdata, SI5351_CLK0_CTRL + num, SI5351_CLK_PLL_SELECT,
 573                         (parent == SI5351_MULTISYNTH_SRC_VCO0) ? 0 :
 574                         SI5351_CLK_PLL_SELECT);
 575         return 0;
 576 }
 577 
 578 static unsigned char si5351_msynth_get_parent(struct clk_hw *hw)
 579 {
 580         struct si5351_hw_data *hwdata =
 581                 container_of(hw, struct si5351_hw_data, hw);
 582         u8 val;
 583 
 584         val = si5351_reg_read(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num);
 585 
 586         return (val & SI5351_CLK_PLL_SELECT) ? 1 : 0;
 587 }
 588 
 589 static int si5351_msynth_set_parent(struct clk_hw *hw, u8 index)
 590 {
 591         struct si5351_hw_data *hwdata =
 592                 container_of(hw, struct si5351_hw_data, hw);
 593 
 594         return _si5351_msynth_reparent(hwdata->drvdata, hwdata->num,
 595                                (index == 0) ? SI5351_MULTISYNTH_SRC_VCO0 :
 596                                SI5351_MULTISYNTH_SRC_VCO1);
 597 }
 598 
 599 static unsigned long si5351_msynth_recalc_rate(struct clk_hw *hw,
 600                                                unsigned long parent_rate)
 601 {
 602         struct si5351_hw_data *hwdata =
 603                 container_of(hw, struct si5351_hw_data, hw);
 604         u8 reg = si5351_msynth_params_address(hwdata->num);
 605         unsigned long long rate;
 606         unsigned long m;
 607 
 608         if (!hwdata->params.valid)
 609                 si5351_read_parameters(hwdata->drvdata, reg, &hwdata->params);
 610 
 611         /*
 612          * multisync0-5: fOUT = (128 * P3 * fIN) / (P1*P3 + P2 + 512*P3)
 613          * multisync6-7: fOUT = fIN / P1
 614          */
 615         rate = parent_rate;
 616         if (hwdata->num > 5) {
 617                 m = hwdata->params.p1;
 618         } else if (hwdata->params.p3 == 0) {
 619                 return parent_rate;
 620         } else if ((si5351_reg_read(hwdata->drvdata, reg + 2) &
 621                     SI5351_OUTPUT_CLK_DIVBY4) == SI5351_OUTPUT_CLK_DIVBY4) {
 622                 m = 4;
 623         } else {
 624                 rate *= 128 * hwdata->params.p3;
 625                 m = hwdata->params.p1 * hwdata->params.p3;
 626                 m += hwdata->params.p2;
 627                 m += 512 * hwdata->params.p3;
 628         }
 629 
 630         if (m == 0)
 631                 return 0;
 632         do_div(rate, m);
 633 
 634         dev_dbg(&hwdata->drvdata->client->dev,
 635                 "%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, m = %lu, parent_rate = %lu, rate = %lu\n",
 636                 __func__, clk_hw_get_name(hw),
 637                 hwdata->params.p1, hwdata->params.p2, hwdata->params.p3,
 638                 m, parent_rate, (unsigned long)rate);
 639 
 640         return (unsigned long)rate;
 641 }
 642 
 643 static long si5351_msynth_round_rate(struct clk_hw *hw, unsigned long rate,
 644                                      unsigned long *parent_rate)
 645 {
 646         struct si5351_hw_data *hwdata =
 647                 container_of(hw, struct si5351_hw_data, hw);
 648         unsigned long long lltmp;
 649         unsigned long a, b, c;
 650         int divby4;
 651 
 652         /* multisync6-7 can only handle freqencies < 150MHz */
 653         if (hwdata->num >= 6 && rate > SI5351_MULTISYNTH67_MAX_FREQ)
 654                 rate = SI5351_MULTISYNTH67_MAX_FREQ;
 655 
 656         /* multisync frequency is 1MHz .. 160MHz */
 657         if (rate > SI5351_MULTISYNTH_MAX_FREQ)
 658                 rate = SI5351_MULTISYNTH_MAX_FREQ;
 659         if (rate < SI5351_MULTISYNTH_MIN_FREQ)
 660                 rate = SI5351_MULTISYNTH_MIN_FREQ;
 661 
 662         divby4 = 0;
 663         if (rate > SI5351_MULTISYNTH_DIVBY4_FREQ)
 664                 divby4 = 1;
 665 
 666         /* multisync can set pll */
 667         if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
 668                 /*
 669                  * find largest integer divider for max
 670                  * vco frequency and given target rate
 671                  */
 672                 if (divby4 == 0) {
 673                         lltmp = SI5351_PLL_VCO_MAX;
 674                         do_div(lltmp, rate);
 675                         a = (unsigned long)lltmp;
 676                 } else
 677                         a = 4;
 678 
 679                 b = 0;
 680                 c = 1;
 681 
 682                 *parent_rate = a * rate;
 683         } else if (hwdata->num >= 6) {
 684                 /* determine the closest integer divider */
 685                 a = DIV_ROUND_CLOSEST(*parent_rate, rate);
 686                 if (a < SI5351_MULTISYNTH_A_MIN)
 687                         a = SI5351_MULTISYNTH_A_MIN;
 688                 if (a > SI5351_MULTISYNTH67_A_MAX)
 689                         a = SI5351_MULTISYNTH67_A_MAX;
 690 
 691                 b = 0;
 692                 c = 1;
 693         } else {
 694                 unsigned long rfrac, denom;
 695 
 696                 /* disable divby4 */
 697                 if (divby4) {
 698                         rate = SI5351_MULTISYNTH_DIVBY4_FREQ;
 699                         divby4 = 0;
 700                 }
 701 
 702                 /* determine integer part of divider equation */
 703                 a = *parent_rate / rate;
 704                 if (a < SI5351_MULTISYNTH_A_MIN)
 705                         a = SI5351_MULTISYNTH_A_MIN;
 706                 if (a > SI5351_MULTISYNTH_A_MAX)
 707                         a = SI5351_MULTISYNTH_A_MAX;
 708 
 709                 /* find best approximation for b/c = fVCO mod fOUT */
 710                 denom = 1000 * 1000;
 711                 lltmp = (*parent_rate) % rate;
 712                 lltmp *= denom;
 713                 do_div(lltmp, rate);
 714                 rfrac = (unsigned long)lltmp;
 715 
 716                 b = 0;
 717                 c = 1;
 718                 if (rfrac)
 719                         rational_best_approximation(rfrac, denom,
 720                             SI5351_MULTISYNTH_B_MAX, SI5351_MULTISYNTH_C_MAX,
 721                             &b, &c);
 722         }
 723 
 724         /* recalculate rate by fOUT = fIN / (a + b/c) */
 725         lltmp  = *parent_rate;
 726         lltmp *= c;
 727         do_div(lltmp, a * c + b);
 728         rate  = (unsigned long)lltmp;
 729 
 730         /* calculate parameters */
 731         if (divby4) {
 732                 hwdata->params.p3 = 1;
 733                 hwdata->params.p2 = 0;
 734                 hwdata->params.p1 = 0;
 735         } else if (hwdata->num >= 6) {
 736                 hwdata->params.p3 = 0;
 737                 hwdata->params.p2 = 0;
 738                 hwdata->params.p1 = a;
 739         } else {
 740                 hwdata->params.p3  = c;
 741                 hwdata->params.p2  = (128 * b) % c;
 742                 hwdata->params.p1  = 128 * a;
 743                 hwdata->params.p1 += (128 * b / c);
 744                 hwdata->params.p1 -= 512;
 745         }
 746 
 747         dev_dbg(&hwdata->drvdata->client->dev,
 748                 "%s - %s: a = %lu, b = %lu, c = %lu, divby4 = %d, parent_rate = %lu, rate = %lu\n",
 749                 __func__, clk_hw_get_name(hw), a, b, c, divby4,
 750                 *parent_rate, rate);
 751 
 752         return rate;
 753 }
 754 
 755 static int si5351_msynth_set_rate(struct clk_hw *hw, unsigned long rate,
 756                                   unsigned long parent_rate)
 757 {
 758         struct si5351_hw_data *hwdata =
 759                 container_of(hw, struct si5351_hw_data, hw);
 760         u8 reg = si5351_msynth_params_address(hwdata->num);
 761         int divby4 = 0;
 762 
 763         /* write multisynth parameters */
 764         si5351_write_parameters(hwdata->drvdata, reg, &hwdata->params);
 765 
 766         if (rate > SI5351_MULTISYNTH_DIVBY4_FREQ)
 767                 divby4 = 1;
 768 
 769         /* enable/disable integer mode and divby4 on multisynth0-5 */
 770         if (hwdata->num < 6) {
 771                 si5351_set_bits(hwdata->drvdata, reg + 2,
 772                                 SI5351_OUTPUT_CLK_DIVBY4,
 773                                 (divby4) ? SI5351_OUTPUT_CLK_DIVBY4 : 0);
 774                 si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num,
 775                         SI5351_CLK_INTEGER_MODE,
 776                         (hwdata->params.p2 == 0) ? SI5351_CLK_INTEGER_MODE : 0);
 777         }
 778 
 779         dev_dbg(&hwdata->drvdata->client->dev,
 780                 "%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, divby4 = %d, parent_rate = %lu, rate = %lu\n",
 781                 __func__, clk_hw_get_name(hw),
 782                 hwdata->params.p1, hwdata->params.p2, hwdata->params.p3,
 783                 divby4, parent_rate, rate);
 784 
 785         return 0;
 786 }
 787 
 788 static const struct clk_ops si5351_msynth_ops = {
 789         .set_parent = si5351_msynth_set_parent,
 790         .get_parent = si5351_msynth_get_parent,
 791         .recalc_rate = si5351_msynth_recalc_rate,
 792         .round_rate = si5351_msynth_round_rate,
 793         .set_rate = si5351_msynth_set_rate,
 794 };
 795 
 796 /*
 797  * Si5351 clkout divider
 798  */
 799 static int _si5351_clkout_reparent(struct si5351_driver_data *drvdata,
 800                                    int num, enum si5351_clkout_src parent)
 801 {
 802         u8 val;
 803 
 804         if (num > 8)
 805                 return -EINVAL;
 806 
 807         switch (parent) {
 808         case SI5351_CLKOUT_SRC_MSYNTH_N:
 809                 val = SI5351_CLK_INPUT_MULTISYNTH_N;
 810                 break;
 811         case SI5351_CLKOUT_SRC_MSYNTH_0_4:
 812                 /* clk0/clk4 can only connect to its own multisync */
 813                 if (num == 0 || num == 4)
 814                         val = SI5351_CLK_INPUT_MULTISYNTH_N;
 815                 else
 816                         val = SI5351_CLK_INPUT_MULTISYNTH_0_4;
 817                 break;
 818         case SI5351_CLKOUT_SRC_XTAL:
 819                 val = SI5351_CLK_INPUT_XTAL;
 820                 break;
 821         case SI5351_CLKOUT_SRC_CLKIN:
 822                 if (drvdata->variant != SI5351_VARIANT_C)
 823                         return -EINVAL;
 824 
 825                 val = SI5351_CLK_INPUT_CLKIN;
 826                 break;
 827         default:
 828                 return 0;
 829         }
 830 
 831         si5351_set_bits(drvdata, SI5351_CLK0_CTRL + num,
 832                         SI5351_CLK_INPUT_MASK, val);
 833         return 0;
 834 }
 835 
 836 static int _si5351_clkout_set_drive_strength(
 837         struct si5351_driver_data *drvdata, int num,
 838         enum si5351_drive_strength drive)
 839 {
 840         u8 mask;
 841 
 842         if (num > 8)
 843                 return -EINVAL;
 844 
 845         switch (drive) {
 846         case SI5351_DRIVE_2MA:
 847                 mask = SI5351_CLK_DRIVE_STRENGTH_2MA;
 848                 break;
 849         case SI5351_DRIVE_4MA:
 850                 mask = SI5351_CLK_DRIVE_STRENGTH_4MA;
 851                 break;
 852         case SI5351_DRIVE_6MA:
 853                 mask = SI5351_CLK_DRIVE_STRENGTH_6MA;
 854                 break;
 855         case SI5351_DRIVE_8MA:
 856                 mask = SI5351_CLK_DRIVE_STRENGTH_8MA;
 857                 break;
 858         default:
 859                 return 0;
 860         }
 861 
 862         si5351_set_bits(drvdata, SI5351_CLK0_CTRL + num,
 863                         SI5351_CLK_DRIVE_STRENGTH_MASK, mask);
 864         return 0;
 865 }
 866 
 867 static int _si5351_clkout_set_disable_state(
 868         struct si5351_driver_data *drvdata, int num,
 869         enum si5351_disable_state state)
 870 {
 871         u8 reg = (num < 4) ? SI5351_CLK3_0_DISABLE_STATE :
 872                 SI5351_CLK7_4_DISABLE_STATE;
 873         u8 shift = (num < 4) ? (2 * num) : (2 * (num-4));
 874         u8 mask = SI5351_CLK_DISABLE_STATE_MASK << shift;
 875         u8 val;
 876 
 877         if (num > 8)
 878                 return -EINVAL;
 879 
 880         switch (state) {
 881         case SI5351_DISABLE_LOW:
 882                 val = SI5351_CLK_DISABLE_STATE_LOW;
 883                 break;
 884         case SI5351_DISABLE_HIGH:
 885                 val = SI5351_CLK_DISABLE_STATE_HIGH;
 886                 break;
 887         case SI5351_DISABLE_FLOATING:
 888                 val = SI5351_CLK_DISABLE_STATE_FLOAT;
 889                 break;
 890         case SI5351_DISABLE_NEVER:
 891                 val = SI5351_CLK_DISABLE_STATE_NEVER;
 892                 break;
 893         default:
 894                 return 0;
 895         }
 896 
 897         si5351_set_bits(drvdata, reg, mask, val << shift);
 898 
 899         return 0;
 900 }
 901 
 902 static void _si5351_clkout_reset_pll(struct si5351_driver_data *drvdata, int num)
 903 {
 904         u8 val = si5351_reg_read(drvdata, SI5351_CLK0_CTRL + num);
 905 
 906         switch (val & SI5351_CLK_INPUT_MASK) {
 907         case SI5351_CLK_INPUT_XTAL:
 908         case SI5351_CLK_INPUT_CLKIN:
 909                 return;  /* pll not used, no need to reset */
 910         }
 911 
 912         si5351_reg_write(drvdata, SI5351_PLL_RESET,
 913                          val & SI5351_CLK_PLL_SELECT ? SI5351_PLL_RESET_B :
 914                                                        SI5351_PLL_RESET_A);
 915 
 916         dev_dbg(&drvdata->client->dev, "%s - %s: pll = %d\n",
 917                 __func__, clk_hw_get_name(&drvdata->clkout[num].hw),
 918                 (val & SI5351_CLK_PLL_SELECT) ? 1 : 0);
 919 }
 920 
 921 static int si5351_clkout_prepare(struct clk_hw *hw)
 922 {
 923         struct si5351_hw_data *hwdata =
 924                 container_of(hw, struct si5351_hw_data, hw);
 925         struct si5351_platform_data *pdata =
 926                 hwdata->drvdata->client->dev.platform_data;
 927 
 928         si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num,
 929                         SI5351_CLK_POWERDOWN, 0);
 930 
 931         /*
 932          * Do a pll soft reset on the parent pll -- needed to get a
 933          * deterministic phase relationship between the output clocks.
 934          */
 935         if (pdata->clkout[hwdata->num].pll_reset)
 936                 _si5351_clkout_reset_pll(hwdata->drvdata, hwdata->num);
 937 
 938         si5351_set_bits(hwdata->drvdata, SI5351_OUTPUT_ENABLE_CTRL,
 939                         (1 << hwdata->num), 0);
 940         return 0;
 941 }
 942 
 943 static void si5351_clkout_unprepare(struct clk_hw *hw)
 944 {
 945         struct si5351_hw_data *hwdata =
 946                 container_of(hw, struct si5351_hw_data, hw);
 947 
 948         si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num,
 949                         SI5351_CLK_POWERDOWN, SI5351_CLK_POWERDOWN);
 950         si5351_set_bits(hwdata->drvdata, SI5351_OUTPUT_ENABLE_CTRL,
 951                         (1 << hwdata->num), (1 << hwdata->num));
 952 }
 953 
 954 static u8 si5351_clkout_get_parent(struct clk_hw *hw)
 955 {
 956         struct si5351_hw_data *hwdata =
 957                 container_of(hw, struct si5351_hw_data, hw);
 958         int index = 0;
 959         unsigned char val;
 960 
 961         val = si5351_reg_read(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num);
 962         switch (val & SI5351_CLK_INPUT_MASK) {
 963         case SI5351_CLK_INPUT_MULTISYNTH_N:
 964                 index = 0;
 965                 break;
 966         case SI5351_CLK_INPUT_MULTISYNTH_0_4:
 967                 index = 1;
 968                 break;
 969         case SI5351_CLK_INPUT_XTAL:
 970                 index = 2;
 971                 break;
 972         case SI5351_CLK_INPUT_CLKIN:
 973                 index = 3;
 974                 break;
 975         }
 976 
 977         return index;
 978 }
 979 
 980 static int si5351_clkout_set_parent(struct clk_hw *hw, u8 index)
 981 {
 982         struct si5351_hw_data *hwdata =
 983                 container_of(hw, struct si5351_hw_data, hw);
 984         enum si5351_clkout_src parent = SI5351_CLKOUT_SRC_DEFAULT;
 985 
 986         switch (index) {
 987         case 0:
 988                 parent = SI5351_CLKOUT_SRC_MSYNTH_N;
 989                 break;
 990         case 1:
 991                 parent = SI5351_CLKOUT_SRC_MSYNTH_0_4;
 992                 break;
 993         case 2:
 994                 parent = SI5351_CLKOUT_SRC_XTAL;
 995                 break;
 996         case 3:
 997                 parent = SI5351_CLKOUT_SRC_CLKIN;
 998                 break;
 999         }
1000 
1001         return _si5351_clkout_reparent(hwdata->drvdata, hwdata->num, parent);
1002 }
1003 
1004 static unsigned long si5351_clkout_recalc_rate(struct clk_hw *hw,
1005                                                unsigned long parent_rate)
1006 {
1007         struct si5351_hw_data *hwdata =
1008                 container_of(hw, struct si5351_hw_data, hw);
1009         unsigned char reg;
1010         unsigned char rdiv;
1011 
1012         if (hwdata->num <= 5)
1013                 reg = si5351_msynth_params_address(hwdata->num) + 2;
1014         else
1015                 reg = SI5351_CLK6_7_OUTPUT_DIVIDER;
1016 
1017         rdiv = si5351_reg_read(hwdata->drvdata, reg);
1018         if (hwdata->num == 6) {
1019                 rdiv &= SI5351_OUTPUT_CLK6_DIV_MASK;
1020         } else {
1021                 rdiv &= SI5351_OUTPUT_CLK_DIV_MASK;
1022                 rdiv >>= SI5351_OUTPUT_CLK_DIV_SHIFT;
1023         }
1024 
1025         return parent_rate >> rdiv;
1026 }
1027 
1028 static long si5351_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
1029                                      unsigned long *parent_rate)
1030 {
1031         struct si5351_hw_data *hwdata =
1032                 container_of(hw, struct si5351_hw_data, hw);
1033         unsigned char rdiv;
1034 
1035         /* clkout6/7 can only handle output freqencies < 150MHz */
1036         if (hwdata->num >= 6 && rate > SI5351_CLKOUT67_MAX_FREQ)
1037                 rate = SI5351_CLKOUT67_MAX_FREQ;
1038 
1039         /* clkout freqency is 8kHz - 160MHz */
1040         if (rate > SI5351_CLKOUT_MAX_FREQ)
1041                 rate = SI5351_CLKOUT_MAX_FREQ;
1042         if (rate < SI5351_CLKOUT_MIN_FREQ)
1043                 rate = SI5351_CLKOUT_MIN_FREQ;
1044 
1045         /* request frequency if multisync master */
1046         if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
1047                 /* use r divider for frequencies below 1MHz */
1048                 rdiv = SI5351_OUTPUT_CLK_DIV_1;
1049                 while (rate < SI5351_MULTISYNTH_MIN_FREQ &&
1050                        rdiv < SI5351_OUTPUT_CLK_DIV_128) {
1051                         rdiv += 1;
1052                         rate *= 2;
1053                 }
1054                 *parent_rate = rate;
1055         } else {
1056                 unsigned long new_rate, new_err, err;
1057 
1058                 /* round to closed rdiv */
1059                 rdiv = SI5351_OUTPUT_CLK_DIV_1;
1060                 new_rate = *parent_rate;
1061                 err = abs(new_rate - rate);
1062                 do {
1063                         new_rate >>= 1;
1064                         new_err = abs(new_rate - rate);
1065                         if (new_err > err || rdiv == SI5351_OUTPUT_CLK_DIV_128)
1066                                 break;
1067                         rdiv++;
1068                         err = new_err;
1069                 } while (1);
1070         }
1071         rate = *parent_rate >> rdiv;
1072 
1073         dev_dbg(&hwdata->drvdata->client->dev,
1074                 "%s - %s: rdiv = %u, parent_rate = %lu, rate = %lu\n",
1075                 __func__, clk_hw_get_name(hw), (1 << rdiv),
1076                 *parent_rate, rate);
1077 
1078         return rate;
1079 }
1080 
1081 static int si5351_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
1082                                   unsigned long parent_rate)
1083 {
1084         struct si5351_hw_data *hwdata =
1085                 container_of(hw, struct si5351_hw_data, hw);
1086         unsigned long new_rate, new_err, err;
1087         unsigned char rdiv;
1088 
1089         /* round to closed rdiv */
1090         rdiv = SI5351_OUTPUT_CLK_DIV_1;
1091         new_rate = parent_rate;
1092         err = abs(new_rate - rate);
1093         do {
1094                 new_rate >>= 1;
1095                 new_err = abs(new_rate - rate);
1096                 if (new_err > err || rdiv == SI5351_OUTPUT_CLK_DIV_128)
1097                         break;
1098                 rdiv++;
1099                 err = new_err;
1100         } while (1);
1101 
1102         /* write output divider */
1103         switch (hwdata->num) {
1104         case 6:
1105                 si5351_set_bits(hwdata->drvdata, SI5351_CLK6_7_OUTPUT_DIVIDER,
1106                                 SI5351_OUTPUT_CLK6_DIV_MASK, rdiv);
1107                 break;
1108         case 7:
1109                 si5351_set_bits(hwdata->drvdata, SI5351_CLK6_7_OUTPUT_DIVIDER,
1110                                 SI5351_OUTPUT_CLK_DIV_MASK,
1111                                 rdiv << SI5351_OUTPUT_CLK_DIV_SHIFT);
1112                 break;
1113         default:
1114                 si5351_set_bits(hwdata->drvdata,
1115                                 si5351_msynth_params_address(hwdata->num) + 2,
1116                                 SI5351_OUTPUT_CLK_DIV_MASK,
1117                                 rdiv << SI5351_OUTPUT_CLK_DIV_SHIFT);
1118         }
1119 
1120         /* powerup clkout */
1121         si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num,
1122                         SI5351_CLK_POWERDOWN, 0);
1123 
1124         dev_dbg(&hwdata->drvdata->client->dev,
1125                 "%s - %s: rdiv = %u, parent_rate = %lu, rate = %lu\n",
1126                 __func__, clk_hw_get_name(hw), (1 << rdiv),
1127                 parent_rate, rate);
1128 
1129         return 0;
1130 }
1131 
1132 static const struct clk_ops si5351_clkout_ops = {
1133         .prepare = si5351_clkout_prepare,
1134         .unprepare = si5351_clkout_unprepare,
1135         .set_parent = si5351_clkout_set_parent,
1136         .get_parent = si5351_clkout_get_parent,
1137         .recalc_rate = si5351_clkout_recalc_rate,
1138         .round_rate = si5351_clkout_round_rate,
1139         .set_rate = si5351_clkout_set_rate,
1140 };
1141 
1142 /*
1143  * Si5351 i2c probe and DT
1144  */
1145 #ifdef CONFIG_OF
1146 static const struct of_device_id si5351_dt_ids[] = {
1147         { .compatible = "silabs,si5351a", .data = (void *)SI5351_VARIANT_A, },
1148         { .compatible = "silabs,si5351a-msop",
1149                                          .data = (void *)SI5351_VARIANT_A3, },
1150         { .compatible = "silabs,si5351b", .data = (void *)SI5351_VARIANT_B, },
1151         { .compatible = "silabs,si5351c", .data = (void *)SI5351_VARIANT_C, },
1152         { }
1153 };
1154 MODULE_DEVICE_TABLE(of, si5351_dt_ids);
1155 
1156 static int si5351_dt_parse(struct i2c_client *client,
1157                            enum si5351_variant variant)
1158 {
1159         struct device_node *child, *np = client->dev.of_node;
1160         struct si5351_platform_data *pdata;
1161         struct property *prop;
1162         const __be32 *p;
1163         int num = 0;
1164         u32 val;
1165 
1166         if (np == NULL)
1167                 return 0;
1168 
1169         pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
1170         if (!pdata)
1171                 return -ENOMEM;
1172 
1173         /*
1174          * property silabs,pll-source : <num src>, [<..>]
1175          * allow to selectively set pll source
1176          */
1177         of_property_for_each_u32(np, "silabs,pll-source", prop, p, num) {
1178                 if (num >= 2) {
1179                         dev_err(&client->dev,
1180                                 "invalid pll %d on pll-source prop\n", num);
1181                         return -EINVAL;
1182                 }
1183 
1184                 p = of_prop_next_u32(prop, p, &val);
1185                 if (!p) {
1186                         dev_err(&client->dev,
1187                                 "missing pll-source for pll %d\n", num);
1188                         return -EINVAL;
1189                 }
1190 
1191                 switch (val) {
1192                 case 0:
1193                         pdata->pll_src[num] = SI5351_PLL_SRC_XTAL;
1194                         break;
1195                 case 1:
1196                         if (variant != SI5351_VARIANT_C) {
1197                                 dev_err(&client->dev,
1198                                         "invalid parent %d for pll %d\n",
1199                                         val, num);
1200                                 return -EINVAL;
1201                         }
1202                         pdata->pll_src[num] = SI5351_PLL_SRC_CLKIN;
1203                         break;
1204                 default:
1205                         dev_err(&client->dev,
1206                                  "invalid parent %d for pll %d\n", val, num);
1207                         return -EINVAL;
1208                 }
1209         }
1210 
1211         /* per clkout properties */
1212         for_each_child_of_node(np, child) {
1213                 if (of_property_read_u32(child, "reg", &num)) {
1214                         dev_err(&client->dev, "missing reg property of %pOFn\n",
1215                                 child);
1216                         goto put_child;
1217                 }
1218 
1219                 if (num >= 8 ||
1220                     (variant == SI5351_VARIANT_A3 && num >= 3)) {
1221                         dev_err(&client->dev, "invalid clkout %d\n", num);
1222                         goto put_child;
1223                 }
1224 
1225                 if (!of_property_read_u32(child, "silabs,multisynth-source",
1226                                           &val)) {
1227                         switch (val) {
1228                         case 0:
1229                                 pdata->clkout[num].multisynth_src =
1230                                         SI5351_MULTISYNTH_SRC_VCO0;
1231                                 break;
1232                         case 1:
1233                                 pdata->clkout[num].multisynth_src =
1234                                         SI5351_MULTISYNTH_SRC_VCO1;
1235                                 break;
1236                         default:
1237                                 dev_err(&client->dev,
1238                                         "invalid parent %d for multisynth %d\n",
1239                                         val, num);
1240                                 goto put_child;
1241                         }
1242                 }
1243 
1244                 if (!of_property_read_u32(child, "silabs,clock-source", &val)) {
1245                         switch (val) {
1246                         case 0:
1247                                 pdata->clkout[num].clkout_src =
1248                                         SI5351_CLKOUT_SRC_MSYNTH_N;
1249                                 break;
1250                         case 1:
1251                                 pdata->clkout[num].clkout_src =
1252                                         SI5351_CLKOUT_SRC_MSYNTH_0_4;
1253                                 break;
1254                         case 2:
1255                                 pdata->clkout[num].clkout_src =
1256                                         SI5351_CLKOUT_SRC_XTAL;
1257                                 break;
1258                         case 3:
1259                                 if (variant != SI5351_VARIANT_C) {
1260                                         dev_err(&client->dev,
1261                                                 "invalid parent %d for clkout %d\n",
1262                                                 val, num);
1263                                         goto put_child;
1264                                 }
1265                                 pdata->clkout[num].clkout_src =
1266                                         SI5351_CLKOUT_SRC_CLKIN;
1267                                 break;
1268                         default:
1269                                 dev_err(&client->dev,
1270                                         "invalid parent %d for clkout %d\n",
1271                                         val, num);
1272                                 goto put_child;
1273                         }
1274                 }
1275 
1276                 if (!of_property_read_u32(child, "silabs,drive-strength",
1277                                           &val)) {
1278                         switch (val) {
1279                         case SI5351_DRIVE_2MA:
1280                         case SI5351_DRIVE_4MA:
1281                         case SI5351_DRIVE_6MA:
1282                         case SI5351_DRIVE_8MA:
1283                                 pdata->clkout[num].drive = val;
1284                                 break;
1285                         default:
1286                                 dev_err(&client->dev,
1287                                         "invalid drive strength %d for clkout %d\n",
1288                                         val, num);
1289                                 goto put_child;
1290                         }
1291                 }
1292 
1293                 if (!of_property_read_u32(child, "silabs,disable-state",
1294                                           &val)) {
1295                         switch (val) {
1296                         case 0:
1297                                 pdata->clkout[num].disable_state =
1298                                         SI5351_DISABLE_LOW;
1299                                 break;
1300                         case 1:
1301                                 pdata->clkout[num].disable_state =
1302                                         SI5351_DISABLE_HIGH;
1303                                 break;
1304                         case 2:
1305                                 pdata->clkout[num].disable_state =
1306                                         SI5351_DISABLE_FLOATING;
1307                                 break;
1308                         case 3:
1309                                 pdata->clkout[num].disable_state =
1310                                         SI5351_DISABLE_NEVER;
1311                                 break;
1312                         default:
1313                                 dev_err(&client->dev,
1314                                         "invalid disable state %d for clkout %d\n",
1315                                         val, num);
1316                                 goto put_child;
1317                         }
1318                 }
1319 
1320                 if (!of_property_read_u32(child, "clock-frequency", &val))
1321                         pdata->clkout[num].rate = val;
1322 
1323                 pdata->clkout[num].pll_master =
1324                         of_property_read_bool(child, "silabs,pll-master");
1325 
1326                 pdata->clkout[num].pll_reset =
1327                         of_property_read_bool(child, "silabs,pll-reset");
1328         }
1329         client->dev.platform_data = pdata;
1330 
1331         return 0;
1332 put_child:
1333         of_node_put(child);
1334         return -EINVAL;
1335 }
1336 
1337 static struct clk_hw *
1338 si53351_of_clk_get(struct of_phandle_args *clkspec, void *data)
1339 {
1340         struct si5351_driver_data *drvdata = data;
1341         unsigned int idx = clkspec->args[0];
1342 
1343         if (idx >= drvdata->num_clkout) {
1344                 pr_err("%s: invalid index %u\n", __func__, idx);
1345                 return ERR_PTR(-EINVAL);
1346         }
1347 
1348         return &drvdata->clkout[idx].hw;
1349 }
1350 #else
1351 static int si5351_dt_parse(struct i2c_client *client, enum si5351_variant variant)
1352 {
1353         return 0;
1354 }
1355 
1356 static struct clk_hw *
1357 si53351_of_clk_get(struct of_phandle_args *clkspec, void *data)
1358 {
1359         return NULL;
1360 }
1361 #endif /* CONFIG_OF */
1362 
1363 static int si5351_i2c_probe(struct i2c_client *client,
1364                             const struct i2c_device_id *id)
1365 {
1366         enum si5351_variant variant = (enum si5351_variant)id->driver_data;
1367         struct si5351_platform_data *pdata;
1368         struct si5351_driver_data *drvdata;
1369         struct clk_init_data init;
1370         const char *parent_names[4];
1371         u8 num_parents, num_clocks;
1372         int ret, n;
1373 
1374         ret = si5351_dt_parse(client, variant);
1375         if (ret)
1376                 return ret;
1377 
1378         pdata = client->dev.platform_data;
1379         if (!pdata)
1380                 return -EINVAL;
1381 
1382         drvdata = devm_kzalloc(&client->dev, sizeof(*drvdata), GFP_KERNEL);
1383         if (!drvdata)
1384                 return -ENOMEM;
1385 
1386         i2c_set_clientdata(client, drvdata);
1387         drvdata->client = client;
1388         drvdata->variant = variant;
1389         drvdata->pxtal = devm_clk_get(&client->dev, "xtal");
1390         drvdata->pclkin = devm_clk_get(&client->dev, "clkin");
1391 
1392         if (PTR_ERR(drvdata->pxtal) == -EPROBE_DEFER ||
1393             PTR_ERR(drvdata->pclkin) == -EPROBE_DEFER)
1394                 return -EPROBE_DEFER;
1395 
1396         /*
1397          * Check for valid parent clock: VARIANT_A and VARIANT_B need XTAL,
1398          *   VARIANT_C can have CLKIN instead.
1399          */
1400         if (IS_ERR(drvdata->pxtal) &&
1401             (drvdata->variant != SI5351_VARIANT_C || IS_ERR(drvdata->pclkin))) {
1402                 dev_err(&client->dev, "missing parent clock\n");
1403                 return -EINVAL;
1404         }
1405 
1406         drvdata->regmap = devm_regmap_init_i2c(client, &si5351_regmap_config);
1407         if (IS_ERR(drvdata->regmap)) {
1408                 dev_err(&client->dev, "failed to allocate register map\n");
1409                 return PTR_ERR(drvdata->regmap);
1410         }
1411 
1412         /* Disable interrupts */
1413         si5351_reg_write(drvdata, SI5351_INTERRUPT_MASK, 0xf0);
1414         /* Ensure pll select is on XTAL for Si5351A/B */
1415         if (drvdata->variant != SI5351_VARIANT_C)
1416                 si5351_set_bits(drvdata, SI5351_PLL_INPUT_SOURCE,
1417                                 SI5351_PLLA_SOURCE | SI5351_PLLB_SOURCE, 0);
1418 
1419         /* setup clock configuration */
1420         for (n = 0; n < 2; n++) {
1421                 ret = _si5351_pll_reparent(drvdata, n, pdata->pll_src[n]);
1422                 if (ret) {
1423                         dev_err(&client->dev,
1424                                 "failed to reparent pll %d to %d\n",
1425                                 n, pdata->pll_src[n]);
1426                         return ret;
1427                 }
1428         }
1429 
1430         for (n = 0; n < 8; n++) {
1431                 ret = _si5351_msynth_reparent(drvdata, n,
1432                                               pdata->clkout[n].multisynth_src);
1433                 if (ret) {
1434                         dev_err(&client->dev,
1435                                 "failed to reparent multisynth %d to %d\n",
1436                                 n, pdata->clkout[n].multisynth_src);
1437                         return ret;
1438                 }
1439 
1440                 ret = _si5351_clkout_reparent(drvdata, n,
1441                                               pdata->clkout[n].clkout_src);
1442                 if (ret) {
1443                         dev_err(&client->dev,
1444                                 "failed to reparent clkout %d to %d\n",
1445                                 n, pdata->clkout[n].clkout_src);
1446                         return ret;
1447                 }
1448 
1449                 ret = _si5351_clkout_set_drive_strength(drvdata, n,
1450                                                         pdata->clkout[n].drive);
1451                 if (ret) {
1452                         dev_err(&client->dev,
1453                                 "failed set drive strength of clkout%d to %d\n",
1454                                 n, pdata->clkout[n].drive);
1455                         return ret;
1456                 }
1457 
1458                 ret = _si5351_clkout_set_disable_state(drvdata, n,
1459                                                 pdata->clkout[n].disable_state);
1460                 if (ret) {
1461                         dev_err(&client->dev,
1462                                 "failed set disable state of clkout%d to %d\n",
1463                                 n, pdata->clkout[n].disable_state);
1464                         return ret;
1465                 }
1466         }
1467 
1468         /* register xtal input clock gate */
1469         memset(&init, 0, sizeof(init));
1470         init.name = si5351_input_names[0];
1471         init.ops = &si5351_xtal_ops;
1472         init.flags = 0;
1473         if (!IS_ERR(drvdata->pxtal)) {
1474                 drvdata->pxtal_name = __clk_get_name(drvdata->pxtal);
1475                 init.parent_names = &drvdata->pxtal_name;
1476                 init.num_parents = 1;
1477         }
1478         drvdata->xtal.init = &init;
1479         ret = devm_clk_hw_register(&client->dev, &drvdata->xtal);
1480         if (ret) {
1481                 dev_err(&client->dev, "unable to register %s\n", init.name);
1482                 return ret;
1483         }
1484 
1485         /* register clkin input clock gate */
1486         if (drvdata->variant == SI5351_VARIANT_C) {
1487                 memset(&init, 0, sizeof(init));
1488                 init.name = si5351_input_names[1];
1489                 init.ops = &si5351_clkin_ops;
1490                 if (!IS_ERR(drvdata->pclkin)) {
1491                         drvdata->pclkin_name = __clk_get_name(drvdata->pclkin);
1492                         init.parent_names = &drvdata->pclkin_name;
1493                         init.num_parents = 1;
1494                 }
1495                 drvdata->clkin.init = &init;
1496                 ret = devm_clk_hw_register(&client->dev, &drvdata->clkin);
1497                 if (ret) {
1498                         dev_err(&client->dev, "unable to register %s\n",
1499                                 init.name);
1500                         return ret;
1501                 }
1502         }
1503 
1504         /* Si5351C allows to mux either xtal or clkin to PLL input */
1505         num_parents = (drvdata->variant == SI5351_VARIANT_C) ? 2 : 1;
1506         parent_names[0] = si5351_input_names[0];
1507         parent_names[1] = si5351_input_names[1];
1508 
1509         /* register PLLA */
1510         drvdata->pll[0].num = 0;
1511         drvdata->pll[0].drvdata = drvdata;
1512         drvdata->pll[0].hw.init = &init;
1513         memset(&init, 0, sizeof(init));
1514         init.name = si5351_pll_names[0];
1515         init.ops = &si5351_pll_ops;
1516         init.flags = 0;
1517         init.parent_names = parent_names;
1518         init.num_parents = num_parents;
1519         ret = devm_clk_hw_register(&client->dev, &drvdata->pll[0].hw);
1520         if (ret) {
1521                 dev_err(&client->dev, "unable to register %s\n", init.name);
1522                 return ret;
1523         }
1524 
1525         /* register PLLB or VXCO (Si5351B) */
1526         drvdata->pll[1].num = 1;
1527         drvdata->pll[1].drvdata = drvdata;
1528         drvdata->pll[1].hw.init = &init;
1529         memset(&init, 0, sizeof(init));
1530         if (drvdata->variant == SI5351_VARIANT_B) {
1531                 init.name = si5351_pll_names[2];
1532                 init.ops = &si5351_vxco_ops;
1533                 init.flags = 0;
1534                 init.parent_names = NULL;
1535                 init.num_parents = 0;
1536         } else {
1537                 init.name = si5351_pll_names[1];
1538                 init.ops = &si5351_pll_ops;
1539                 init.flags = 0;
1540                 init.parent_names = parent_names;
1541                 init.num_parents = num_parents;
1542         }
1543         ret = devm_clk_hw_register(&client->dev, &drvdata->pll[1].hw);
1544         if (ret) {
1545                 dev_err(&client->dev, "unable to register %s\n", init.name);
1546                 return ret;
1547         }
1548 
1549         /* register clk multisync and clk out divider */
1550         num_clocks = (drvdata->variant == SI5351_VARIANT_A3) ? 3 : 8;
1551         parent_names[0] = si5351_pll_names[0];
1552         if (drvdata->variant == SI5351_VARIANT_B)
1553                 parent_names[1] = si5351_pll_names[2];
1554         else
1555                 parent_names[1] = si5351_pll_names[1];
1556 
1557         drvdata->msynth = devm_kcalloc(&client->dev, num_clocks,
1558                                        sizeof(*drvdata->msynth), GFP_KERNEL);
1559         drvdata->clkout = devm_kcalloc(&client->dev, num_clocks,
1560                                        sizeof(*drvdata->clkout), GFP_KERNEL);
1561         drvdata->num_clkout = num_clocks;
1562 
1563         if (WARN_ON(!drvdata->msynth || !drvdata->clkout)) {
1564                 ret = -ENOMEM;
1565                 return ret;
1566         }
1567 
1568         for (n = 0; n < num_clocks; n++) {
1569                 drvdata->msynth[n].num = n;
1570                 drvdata->msynth[n].drvdata = drvdata;
1571                 drvdata->msynth[n].hw.init = &init;
1572                 memset(&init, 0, sizeof(init));
1573                 init.name = si5351_msynth_names[n];
1574                 init.ops = &si5351_msynth_ops;
1575                 init.flags = 0;
1576                 if (pdata->clkout[n].pll_master)
1577                         init.flags |= CLK_SET_RATE_PARENT;
1578                 init.parent_names = parent_names;
1579                 init.num_parents = 2;
1580                 ret = devm_clk_hw_register(&client->dev,
1581                                            &drvdata->msynth[n].hw);
1582                 if (ret) {
1583                         dev_err(&client->dev, "unable to register %s\n",
1584                                 init.name);
1585                         return ret;
1586                 }
1587         }
1588 
1589         num_parents = (drvdata->variant == SI5351_VARIANT_C) ? 4 : 3;
1590         parent_names[2] = si5351_input_names[0];
1591         parent_names[3] = si5351_input_names[1];
1592         for (n = 0; n < num_clocks; n++) {
1593                 parent_names[0] = si5351_msynth_names[n];
1594                 parent_names[1] = (n < 4) ? si5351_msynth_names[0] :
1595                         si5351_msynth_names[4];
1596 
1597                 drvdata->clkout[n].num = n;
1598                 drvdata->clkout[n].drvdata = drvdata;
1599                 drvdata->clkout[n].hw.init = &init;
1600                 memset(&init, 0, sizeof(init));
1601                 init.name = si5351_clkout_names[n];
1602                 init.ops = &si5351_clkout_ops;
1603                 init.flags = 0;
1604                 if (pdata->clkout[n].clkout_src == SI5351_CLKOUT_SRC_MSYNTH_N)
1605                         init.flags |= CLK_SET_RATE_PARENT;
1606                 init.parent_names = parent_names;
1607                 init.num_parents = num_parents;
1608                 ret = devm_clk_hw_register(&client->dev,
1609                                            &drvdata->clkout[n].hw);
1610                 if (ret) {
1611                         dev_err(&client->dev, "unable to register %s\n",
1612                                 init.name);
1613                         return ret;
1614                 }
1615 
1616                 /* set initial clkout rate */
1617                 if (pdata->clkout[n].rate != 0) {
1618                         int ret;
1619                         ret = clk_set_rate(drvdata->clkout[n].hw.clk,
1620                                            pdata->clkout[n].rate);
1621                         if (ret != 0) {
1622                                 dev_err(&client->dev, "Cannot set rate : %d\n",
1623                                         ret);
1624                         }
1625                 }
1626         }
1627 
1628         ret = of_clk_add_hw_provider(client->dev.of_node, si53351_of_clk_get,
1629                                      drvdata);
1630         if (ret) {
1631                 dev_err(&client->dev, "unable to add clk provider\n");
1632                 return ret;
1633         }
1634 
1635         return 0;
1636 }
1637 
1638 static int si5351_i2c_remove(struct i2c_client *client)
1639 {
1640         of_clk_del_provider(client->dev.of_node);
1641 
1642         return 0;
1643 }
1644 
1645 static const struct i2c_device_id si5351_i2c_ids[] = {
1646         { "si5351a", SI5351_VARIANT_A },
1647         { "si5351a-msop", SI5351_VARIANT_A3 },
1648         { "si5351b", SI5351_VARIANT_B },
1649         { "si5351c", SI5351_VARIANT_C },
1650         { }
1651 };
1652 MODULE_DEVICE_TABLE(i2c, si5351_i2c_ids);
1653 
1654 static struct i2c_driver si5351_driver = {
1655         .driver = {
1656                 .name = "si5351",
1657                 .of_match_table = of_match_ptr(si5351_dt_ids),
1658         },
1659         .probe = si5351_i2c_probe,
1660         .remove = si5351_i2c_remove,
1661         .id_table = si5351_i2c_ids,
1662 };
1663 module_i2c_driver(si5351_driver);
1664 
1665 MODULE_AUTHOR("Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com");
1666 MODULE_DESCRIPTION("Silicon Labs Si5351A/B/C clock generator driver");
1667 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/clk/clk-si5351.c

DEFINITIONS
