drivers/clk/rockchip/clk_rk3368.c

   1 /*
   2  * (C) Copyright 2017 Rockchip Electronics Co., Ltd
   3  * Author: Andy Yan <andy.yan@rock-chips.com>
   4  * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
   5  * SPDX-License-Identifier:     GPL-2.0
   6  */
   7
   8 #include <common.h>
   9 #include <clk-uclass.h>
  10 #include <dm.h>
  11 #include <dt-structs.h>
  12 #include <errno.h>
  13 #include <mapmem.h>
  14 #include <syscon.h>
  15 #include <bitfield.h>
  16 #include <asm/arch/clock.h>
  17 #include <asm/arch/cru_rk3368.h>
  18 #include <asm/arch/hardware.h>
  19 #include <asm/io.h>
  20 #include <dm/lists.h>
  21 #include <dt-bindings/clock/rk3368-cru.h>
  22
  23 DECLARE_GLOBAL_DATA_PTR;
  24
  25 #if CONFIG_IS_ENABLED(OF_PLATDATA)
  26 struct rk3368_clk_plat {
  27         struct dtd_rockchip_rk3368_cru dtd;
  28 };
  29 #endif
  30
  31 struct pll_div {
  32         u32 nr;
  33         u32 nf;
  34         u32 no;
  35 };
  36
  37 #define OSC_HZ          (24 * 1000 * 1000)
  38 #define APLL_L_HZ       (800 * 1000 * 1000)
  39 #define APLL_B_HZ       (816 * 1000 * 1000)
  40 #define GPLL_HZ         (576 * 1000 * 1000)
  41 #define CPLL_HZ         (400 * 1000 * 1000)
  42
  43 #define DIV_TO_RATE(input_rate, div)    ((input_rate) / ((div) + 1))
  44
  45 #define PLL_DIVISORS(hz, _nr, _no) { \
  46         .nr = _nr, .nf = (u32)((u64)hz * _nr * _no / OSC_HZ), .no = _no}; \
  47         _Static_assert(((u64)hz * _nr * _no / OSC_HZ) * OSC_HZ /\
  48                        (_nr * _no) == hz, #hz "Hz cannot be hit with PLL " \
  49                        "divisors on line " __stringify(__LINE__));
  50
  51 #if IS_ENABLED(CONFIG_SPL_BUILD) || IS_ENABLED(CONFIG_TPL_BUILD)
  52 static const struct pll_div apll_l_init_cfg = PLL_DIVISORS(APLL_L_HZ, 12, 2);
  53 static const struct pll_div apll_b_init_cfg = PLL_DIVISORS(APLL_B_HZ, 1, 2);
  54 #if !defined(CONFIG_TPL_BUILD)
  55 static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 1, 2);
  56 static const struct pll_div cpll_init_cfg = PLL_DIVISORS(CPLL_HZ, 1, 6);
  57 #endif
  58 #endif
  59
  60 static ulong rk3368_clk_get_rate(struct clk *clk);
  61
  62 /* Get pll rate by id */
  63 static uint32_t rkclk_pll_get_rate(struct rk3368_cru *cru,
  64                                    enum rk3368_pll_id pll_id)
  65 {
  66         uint32_t nr, no, nf;
  67         uint32_t con;
  68         struct rk3368_pll *pll = &cru->pll[pll_id];
  69
  70         con = readl(&pll->con3);
  71
  72         switch ((con & PLL_MODE_MASK) >> PLL_MODE_SHIFT) {
  73         case PLL_MODE_SLOW:
  74                 return OSC_HZ;
  75         case PLL_MODE_NORMAL:
  76                 con = readl(&pll->con0);
  77                 no = ((con & PLL_OD_MASK) >> PLL_OD_SHIFT) + 1;
  78                 nr = ((con & PLL_NR_MASK) >> PLL_NR_SHIFT) + 1;
  79                 con = readl(&pll->con1);
  80                 nf = ((con & PLL_NF_MASK) >> PLL_NF_SHIFT) + 1;
  81
  82                 return (24 * nf / (nr * no)) * 1000000;
  83         case PLL_MODE_DEEP_SLOW:
  84         default:
  85                 return 32768;
  86         }
  87 }
  88
  89 #if IS_ENABLED(CONFIG_SPL_BUILD) || IS_ENABLED(CONFIG_TPL_BUILD)
  90 static int rkclk_set_pll(struct rk3368_cru *cru, enum rk3368_pll_id pll_id,
  91                          const struct pll_div *div)
  92 {
  93         struct rk3368_pll *pll = &cru->pll[pll_id];
  94         /* All PLLs have same VCO and output frequency range restrictions*/
  95         uint vco_hz = OSC_HZ / 1000 * div->nf / div->nr * 1000;
  96         uint output_hz = vco_hz / div->no;
  97
  98         debug("PLL at %p: nf=%d, nr=%d, no=%d, vco=%u Hz, output=%u Hz\n",
  99               pll, div->nf, div->nr, div->no, vco_hz, output_hz);
 100
 101         /* enter slow mode and reset pll */
 102         rk_clrsetreg(&pll->con3, PLL_MODE_MASK | PLL_RESET_MASK,
 103                      PLL_RESET << PLL_RESET_SHIFT);
 104
 105         rk_clrsetreg(&pll->con0, PLL_NR_MASK | PLL_OD_MASK,
 106                      ((div->nr - 1) << PLL_NR_SHIFT) |
 107                      ((div->no - 1) << PLL_OD_SHIFT));
 108         writel((div->nf - 1) << PLL_NF_SHIFT, &pll->con1);
 109         /*
 110          * BWADJ should be set to NF / 2 to ensure the nominal bandwidth.
 111          * Compare the RK3368 TRM, section "3.6.4 PLL Bandwidth Adjustment".
 112          */
 113         clrsetbits_le32(&pll->con2, PLL_BWADJ_MASK, (div->nf >> 1) - 1);
 114
 115         udelay(10);
 116
 117         /* return from reset */
 118         rk_clrreg(&pll->con3, PLL_RESET_MASK);
 119
 120         /* waiting for pll lock */
 121         while (!(readl(&pll->con1) & PLL_LOCK_STA))
 122                 udelay(1);
 123
 124         rk_clrsetreg(&pll->con3, PLL_MODE_MASK,
 125                      PLL_MODE_NORMAL << PLL_MODE_SHIFT);
 126
 127         return 0;
 128 }
 129 #endif
 130
 131 #if IS_ENABLED(CONFIG_SPL_BUILD) || IS_ENABLED(CONFIG_TPL_BUILD)
 132 static void rkclk_init(struct rk3368_cru *cru)
 133 {
 134         u32 apllb, aplll, dpll, cpll, gpll;
 135
 136         rkclk_set_pll(cru, APLLB, &apll_b_init_cfg);
 137         rkclk_set_pll(cru, APLLL, &apll_l_init_cfg);
 138 #if !defined(CONFIG_TPL_BUILD)
 139         /*
 140          * If we plan to return to the boot ROM, we can't increase the
 141          * GPLL rate from the SPL stage.
 142          */
 143         rkclk_set_pll(cru, GPLL, &gpll_init_cfg);
 144         rkclk_set_pll(cru, CPLL, &cpll_init_cfg);
 145 #endif
 146
 147         apllb = rkclk_pll_get_rate(cru, APLLB);
 148         aplll = rkclk_pll_get_rate(cru, APLLL);
 149         dpll = rkclk_pll_get_rate(cru, DPLL);
 150         cpll = rkclk_pll_get_rate(cru, CPLL);
 151         gpll = rkclk_pll_get_rate(cru, GPLL);
 152
 153         debug("%s apllb(%d) apll(%d) dpll(%d) cpll(%d) gpll(%d)\n",
 154                __func__, apllb, aplll, dpll, cpll, gpll);
 155 }
 156 #endif
 157
 158 #if !IS_ENABLED(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(MMC_SUPPORT)
 159 static ulong rk3368_mmc_get_clk(struct rk3368_cru *cru, uint clk_id)
 160 {
 161         u32 div, con, con_id, rate;
 162         u32 pll_rate;
 163
 164         switch (clk_id) {
 165         case HCLK_SDMMC:
 166                 con_id = 50;
 167                 break;
 168         case HCLK_EMMC:
 169                 con_id = 51;
 170                 break;
 171         case SCLK_SDIO0:
 172                 con_id = 48;
 173                 break;
 174         default:
 175                 return -EINVAL;
 176         }
 177
 178         con = readl(&cru->clksel_con[con_id]);
 179         switch (con & MMC_PLL_SEL_MASK) {
 180         case MMC_PLL_SEL_GPLL:
 181                 pll_rate = rkclk_pll_get_rate(cru, GPLL);
 182                 break;
 183         case MMC_PLL_SEL_24M:
 184                 pll_rate = OSC_HZ;
 185                 break;
 186         case MMC_PLL_SEL_CPLL:
 187                 pll_rate = rkclk_pll_get_rate(cru, CPLL);
 188                 break;
 189         case MMC_PLL_SEL_USBPHY_480M:
 190         default:
 191                 return -EINVAL;
 192         }
 193         div = (con & MMC_CLK_DIV_MASK) >> MMC_CLK_DIV_SHIFT;
 194         rate = DIV_TO_RATE(pll_rate, div);
 195
 196         debug("%s: raw rate %d (post-divide by 2)\n", __func__, rate);
 197         return rate >> 1;
 198 }
 199
 200 static ulong rk3368_mmc_find_best_rate_and_parent(struct clk *clk,
 201                                                   ulong rate,
 202                                                   u32 *best_mux,
 203                                                   u32 *best_div)
 204 {
 205         int i;
 206         ulong best_rate = 0;
 207         const ulong MHz = 1000000;
 208         const struct {
 209                 u32 mux;
 210                 ulong rate;
 211         } parents[] = {
 212                 { .mux = MMC_PLL_SEL_CPLL, .rate = CPLL_HZ },
 213                 { .mux = MMC_PLL_SEL_GPLL, .rate = GPLL_HZ },
 214                 { .mux = MMC_PLL_SEL_24M,  .rate = 24 * MHz }
 215         };
 216
 217         debug("%s: target rate %ld\n", __func__, rate);
 218         for (i = 0; i < ARRAY_SIZE(parents); ++i) {
 219                 /*
 220                  * Find the largest rate no larger than the target-rate for
 221                  * the current parent.
 222                  */
 223                 ulong parent_rate = parents[i].rate;
 224                 u32 div = DIV_ROUND_UP(parent_rate, rate);
 225                 u32 adj_div = div;
 226                 ulong new_rate = parent_rate / adj_div;
 227
 228                 debug("%s: rate %ld, parent-mux %d, parent-rate %ld, div %d\n",
 229                       __func__, rate, parents[i].mux, parents[i].rate, div);
 230
 231                 /* Skip, if not representable */
 232                 if ((div - 1) > MMC_CLK_DIV_MASK)
 233                         continue;
 234
 235                 /* Skip, if we already have a better (or equal) solution */
 236                 if (new_rate <= best_rate)
 237                         continue;
 238
 239                 /* This is our new best rate. */
 240                 best_rate = new_rate;
 241                 *best_mux = parents[i].mux;
 242                 *best_div = div - 1;
 243         }
 244
 245         debug("%s: best_mux = %x, best_div = %d, best_rate = %ld\n",
 246               __func__, *best_mux, *best_div, best_rate);
 247
 248         return best_rate;
 249 }
 250
 251 static ulong rk3368_mmc_set_clk(struct clk *clk, ulong rate)
 252 {
 253         struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
 254         struct rk3368_cru *cru = priv->cru;
 255         ulong clk_id = clk->id;
 256         u32 con_id, mux = 0, div = 0;
 257
 258         /* Find the best parent and rate */
 259         rk3368_mmc_find_best_rate_and_parent(clk, rate << 1, &mux, &div);
 260
 261         switch (clk_id) {
 262         case HCLK_SDMMC:
 263                 con_id = 50;
 264                 break;
 265         case HCLK_EMMC:
 266                 con_id = 51;
 267                 break;
 268         case SCLK_SDIO0:
 269                 con_id = 48;
 270                 break;
 271         default:
 272                 return -EINVAL;
 273         }
 274
 275         rk_clrsetreg(&cru->clksel_con[con_id],
 276                      MMC_PLL_SEL_MASK | MMC_CLK_DIV_MASK,
 277                      mux | div);
 278
 279         return rk3368_mmc_get_clk(cru, clk_id);
 280 }
 281 #endif
 282
 283 #if IS_ENABLED(CONFIG_TPL_BUILD)
 284 static ulong rk3368_ddr_set_clk(struct rk3368_cru *cru, ulong set_rate)
 285 {
 286         const struct pll_div *dpll_cfg = NULL;
 287         const ulong MHz = 1000000;
 288
 289         /* Fout = ((Fin /NR) * NF )/ NO */
 290         static const struct pll_div dpll_1200 = PLL_DIVISORS(1200 * MHz, 1, 1);
 291         static const struct pll_div dpll_1332 = PLL_DIVISORS(1332 * MHz, 2, 1);
 292         static const struct pll_div dpll_1600 = PLL_DIVISORS(1600 * MHz, 3, 2);
 293
 294         switch (set_rate) {
 295         case 1200*MHz:
 296                 dpll_cfg = &dpll_1200;
 297                 break;
 298         case 1332*MHz:
 299                 dpll_cfg = &dpll_1332;
 300                 break;
 301         case 1600*MHz:
 302                 dpll_cfg = &dpll_1600;
 303                 break;
 304         default:
 305                 pr_err("Unsupported SDRAM frequency!,%ld\n", set_rate);
 306         }
 307         rkclk_set_pll(cru, DPLL, dpll_cfg);
 308
 309         return set_rate;
 310 }
 311 #endif
 312
 313 #if CONFIG_IS_ENABLED(GMAC_ROCKCHIP)
 314 static ulong rk3368_gmac_set_clk(struct rk3368_cru *cru,
 315                                  ulong clk_id, ulong set_rate)
 316 {
 317         /*
 318          * This models the 'assigned-clock-parents = <&ext_gmac>' from
 319          * the DTS and switches to the 'ext_gmac' clock parent.
 320          */
 321         rk_setreg(&cru->clksel_con[43], GMAC_MUX_SEL_EXTCLK);
 322         return set_rate;
 323 }
 324 #endif
 325
 326 /*
 327  * RK3368 SPI clocks have a common divider-width (7 bits) and a single bit
 328  * to select either CPLL or GPLL as the clock-parent. The location within
 329  * the enclosing CLKSEL_CON (i.e. div_shift and sel_shift) are variable.
 330  */
 331
 332 struct spi_clkreg {
 333         uint8_t reg;  /* CLKSEL_CON[reg] register in CRU */
 334         uint8_t div_shift;
 335         uint8_t sel_shift;
 336 };
 337
 338 /*
 339  * The entries are numbered relative to their offset from SCLK_SPI0.
 340  */
 341 static const struct spi_clkreg spi_clkregs[] = {
 342         [0] = { .reg = 45, .div_shift = 0, .sel_shift = 7, },
 343         [1] = { .reg = 45, .div_shift = 8, .sel_shift = 15, },
 344         [2] = { .reg = 46, .div_shift = 8, .sel_shift = 15, },
 345 };
 346
 347 static inline u32 extract_bits(u32 val, unsigned width, unsigned shift)
 348 {
 349         return (val >> shift) & ((1 << width) - 1);
 350 }
 351
 352 static ulong rk3368_spi_get_clk(struct rk3368_cru *cru, ulong clk_id)
 353 {
 354         const struct spi_clkreg *spiclk = NULL;
 355         u32 div, val;
 356
 357         switch (clk_id) {
 358         case SCLK_SPI0 ... SCLK_SPI2:
 359                 spiclk = &spi_clkregs[clk_id - SCLK_SPI0];
 360                 break;
 361
 362         default:
 363                 pr_err("%s: SPI clk-id %ld not supported\n", __func__, clk_id);
 364                 return -EINVAL;
 365         }
 366
 367         val = readl(&cru->clksel_con[spiclk->reg]);
 368         div = extract_bits(val, 7, spiclk->div_shift);
 369
 370         debug("%s: div 0x%x\n", __func__, div);
 371         return DIV_TO_RATE(GPLL_HZ, div);
 372 }
 373
 374 static ulong rk3368_spi_set_clk(struct rk3368_cru *cru, ulong clk_id, uint hz)
 375 {
 376         const struct spi_clkreg *spiclk = NULL;
 377         int src_clk_div;
 378
 379         src_clk_div = DIV_ROUND_UP(GPLL_HZ, hz);
 380         assert(src_clk_div < 127);
 381
 382         switch (clk_id) {
 383         case SCLK_SPI0 ... SCLK_SPI2:
 384                 spiclk = &spi_clkregs[clk_id - SCLK_SPI0];
 385                 break;
 386
 387         default:
 388                 pr_err("%s: SPI clk-id %ld not supported\n", __func__, clk_id);
 389                 return -EINVAL;
 390         }
 391
 392         rk_clrsetreg(&cru->clksel_con[spiclk->reg],
 393                      ((0x7f << spiclk->div_shift) |
 394                       (0x1 << spiclk->sel_shift)),
 395                      ((src_clk_div << spiclk->div_shift) |
 396                       (1 << spiclk->sel_shift)));
 397
 398         return rk3368_spi_get_clk(cru, clk_id);
 399 }
 400
 401 static ulong rk3368_saradc_get_clk(struct rk3368_cru *cru)
 402 {
 403         u32 div, val;
 404
 405         val = readl(&cru->clksel_con[25]);
 406         div = bitfield_extract(val, CLK_SARADC_DIV_CON_SHIFT,
 407                                CLK_SARADC_DIV_CON_WIDTH);
 408
 409         return DIV_TO_RATE(OSC_HZ, div);
 410 }
 411
 412 static ulong rk3368_saradc_set_clk(struct rk3368_cru *cru, uint hz)
 413 {
 414         int src_clk_div;
 415
 416         src_clk_div = DIV_ROUND_UP(OSC_HZ, hz) - 1;
 417         assert(src_clk_div < 128);
 418
 419         rk_clrsetreg(&cru->clksel_con[25],
 420                      CLK_SARADC_DIV_CON_MASK,
 421                      src_clk_div << CLK_SARADC_DIV_CON_SHIFT);
 422
 423         return rk3368_saradc_get_clk(cru);
 424 }
 425
 426 static ulong rk3368_clk_get_rate(struct clk *clk)
 427 {
 428         struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
 429         ulong rate = 0;
 430
 431         debug("%s: id %ld\n", __func__, clk->id);
 432         switch (clk->id) {
 433         case PLL_CPLL:
 434                 rate = rkclk_pll_get_rate(priv->cru, CPLL);
 435                 break;
 436         case PLL_GPLL:
 437                 rate = rkclk_pll_get_rate(priv->cru, GPLL);
 438                 break;
 439         case SCLK_SPI0 ... SCLK_SPI2:
 440                 rate = rk3368_spi_get_clk(priv->cru, clk->id);
 441                 break;
 442 #if !IS_ENABLED(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(MMC_SUPPORT)
 443         case HCLK_SDMMC:
 444         case HCLK_EMMC:
 445                 rate = rk3368_mmc_get_clk(priv->cru, clk->id);
 446                 break;
 447 #endif
 448         case SCLK_SARADC:
 449                 rate = rk3368_saradc_get_clk(priv->cru);
 450                 break;
 451         default:
 452                 return -ENOENT;
 453         }
 454
 455         return rate;
 456 }
 457
 458 static ulong rk3368_clk_set_rate(struct clk *clk, ulong rate)
 459 {
 460         __maybe_unused struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
 461         ulong ret = 0;
 462
 463         debug("%s id:%ld rate:%ld\n", __func__, clk->id, rate);
 464         switch (clk->id) {
 465         case SCLK_SPI0 ... SCLK_SPI2:
 466                 ret = rk3368_spi_set_clk(priv->cru, clk->id, rate);
 467                 break;
 468 #if IS_ENABLED(CONFIG_TPL_BUILD)
 469         case CLK_DDR:
 470                 ret = rk3368_ddr_set_clk(priv->cru, rate);
 471                 break;
 472 #endif
 473 #if !IS_ENABLED(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(MMC_SUPPORT)
 474         case HCLK_SDMMC:
 475         case HCLK_EMMC:
 476                 ret = rk3368_mmc_set_clk(clk, rate);
 477                 break;
 478 #endif
 479 #if CONFIG_IS_ENABLED(GMAC_ROCKCHIP)
 480         case SCLK_MAC:
 481                 /* select the external clock */
 482                 ret = rk3368_gmac_set_clk(priv->cru, clk->id, rate);
 483                 break;
 484 #endif
 485         case SCLK_SARADC:
 486                 ret =  rk3368_saradc_set_clk(priv->cru, rate);
 487                 break;
 488         default:
 489                 return -ENOENT;
 490         }
 491
 492         return ret;
 493 }
 494
 495 static struct clk_ops rk3368_clk_ops = {
 496         .get_rate = rk3368_clk_get_rate,
 497         .set_rate = rk3368_clk_set_rate,
 498 };
 499
 500 static int rk3368_clk_probe(struct udevice *dev)
 501 {
 502         struct rk3368_clk_priv __maybe_unused *priv = dev_get_priv(dev);
 503 #if CONFIG_IS_ENABLED(OF_PLATDATA)
 504         struct rk3368_clk_plat *plat = dev_get_platdata(dev);
 505
 506         priv->cru = map_sysmem(plat->dtd.reg[0], plat->dtd.reg[1]);
 507 #endif
 508 #if IS_ENABLED(CONFIG_SPL_BUILD) || IS_ENABLED(CONFIG_TPL_BUILD)
 509         rkclk_init(priv->cru);
 510 #endif
 511
 512         return 0;
 513 }
 514
 515 static int rk3368_clk_ofdata_to_platdata(struct udevice *dev)
 516 {
 517 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
 518         struct rk3368_clk_priv *priv = dev_get_priv(dev);
 519
 520         priv->cru = dev_read_addr_ptr(dev);
 521 #endif
 522
 523         return 0;
 524 }
 525
 526 static int rk3368_clk_bind(struct udevice *dev)
 527 {
 528         int ret;
 529         struct udevice *sys_child;
 530         struct sysreset_reg *priv;
 531
 532         /* The reset driver does not have a device node, so bind it here */
 533         ret = device_bind_driver(dev, "rockchip_sysreset", "sysreset",
 534                                  &sys_child);
 535         if (ret) {
 536                 debug("Warning: No sysreset driver: ret=%d\n", ret);
 537         } else {
 538                 priv = malloc(sizeof(struct sysreset_reg));
 539                 priv->glb_srst_fst_value = offsetof(struct rk3368_cru,
 540                                                     glb_srst_fst_val);
 541                 priv->glb_srst_snd_value = offsetof(struct rk3368_cru,
 542                                                     glb_srst_snd_val);
 543                 sys_child->priv = priv;
 544         }
 545
 546         return ret;
 547 }
 548
 549 static const struct udevice_id rk3368_clk_ids[] = {
 550         { .compatible = "rockchip,rk3368-cru" },
 551         { }
 552 };
 553
 554 U_BOOT_DRIVER(rockchip_rk3368_cru) = {
 555         .name           = "rockchip_rk3368_cru",
 556         .id             = UCLASS_CLK,
 557         .of_match       = rk3368_clk_ids,
 558         .priv_auto_alloc_size = sizeof(struct rk3368_clk_priv),
 559 #if CONFIG_IS_ENABLED(OF_PLATDATA)
 560         .platdata_auto_alloc_size = sizeof(struct rk3368_clk_plat),
 561 #endif
 562         .ofdata_to_platdata = rk3368_clk_ofdata_to_platdata,
 563         .ops            = &rk3368_clk_ops,
 564         .bind           = rk3368_clk_bind,
 565         .probe          = rk3368_clk_probe,
 566 };