drivers/clk/clk_zynq.c

   1 /*
   2  * Copyright (C) 2017 Weidmüller Interface GmbH & Co. KG
   3  * Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
   4  *
   5  * Copyright (C) 2013 Soren Brinkmann <soren.brinkmann@xilinx.com>
   6  * Copyright (C) 2013 Xilinx, Inc. All rights reserved.
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <common.h>
  12 #include <clk-uclass.h>
  13 #include <dm.h>
  14 #include <dm/lists.h>
  15 #include <errno.h>
  16 #include <asm/io.h>
  17 #include <asm/arch/clk.h>
  18 #include <asm/arch/hardware.h>
  19 #include <asm/arch/sys_proto.h>
  20
  21 /* Register bitfield defines */
  22 #define PLLCTRL_FBDIV_MASK      0x7f000
  23 #define PLLCTRL_FBDIV_SHIFT     12
  24 #define PLLCTRL_BPFORCE_MASK    (1 << 4)
  25 #define PLLCTRL_PWRDWN_MASK     2
  26 #define PLLCTRL_PWRDWN_SHIFT    1
  27 #define PLLCTRL_RESET_MASK      1
  28 #define PLLCTRL_RESET_SHIFT     0
  29
  30 #define ZYNQ_CLK_MAXDIV         0x3f
  31 #define CLK_CTRL_DIV1_SHIFT     20
  32 #define CLK_CTRL_DIV1_MASK      (ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV1_SHIFT)
  33 #define CLK_CTRL_DIV0_SHIFT     8
  34 #define CLK_CTRL_DIV0_MASK      (ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV0_SHIFT)
  35 #define CLK_CTRL_SRCSEL_SHIFT   4
  36 #define CLK_CTRL_SRCSEL_MASK    (0x3 << CLK_CTRL_SRCSEL_SHIFT)
  37
  38 #define CLK_CTRL_DIV2X_SHIFT    26
  39 #define CLK_CTRL_DIV2X_MASK     (ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV2X_SHIFT)
  40 #define CLK_CTRL_DIV3X_SHIFT    20
  41 #define CLK_CTRL_DIV3X_MASK     (ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV3X_SHIFT)
  42
  43 DECLARE_GLOBAL_DATA_PTR;
  44
  45 #ifndef CONFIG_SPL_BUILD
  46 enum zynq_clk_rclk {mio_clk, emio_clk};
  47 #endif
  48
  49 struct zynq_clk_priv {
  50         ulong ps_clk_freq;
  51 #ifndef CONFIG_SPL_BUILD
  52         struct clk gem_emio_clk[2];
  53 #endif
  54 };
  55
  56 static void *zynq_clk_get_register(enum zynq_clk id)
  57 {
  58         switch (id) {
  59         case armpll_clk:
  60                 return &slcr_base->arm_pll_ctrl;
  61         case ddrpll_clk:
  62                 return &slcr_base->ddr_pll_ctrl;
  63         case iopll_clk:
  64                 return &slcr_base->io_pll_ctrl;
  65         case lqspi_clk:
  66                 return &slcr_base->lqspi_clk_ctrl;
  67         case smc_clk:
  68                 return &slcr_base->smc_clk_ctrl;
  69         case pcap_clk:
  70                 return &slcr_base->pcap_clk_ctrl;
  71         case sdio0_clk ... sdio1_clk:
  72                 return &slcr_base->sdio_clk_ctrl;
  73         case uart0_clk ... uart1_clk:
  74                 return &slcr_base->uart_clk_ctrl;
  75         case spi0_clk ... spi1_clk:
  76                 return &slcr_base->spi_clk_ctrl;
  77 #ifndef CONFIG_SPL_BUILD
  78         case dci_clk:
  79                 return &slcr_base->dci_clk_ctrl;
  80         case gem0_clk:
  81                 return &slcr_base->gem0_clk_ctrl;
  82         case gem1_clk:
  83                 return &slcr_base->gem1_clk_ctrl;
  84         case fclk0_clk:
  85                 return &slcr_base->fpga0_clk_ctrl;
  86         case fclk1_clk:
  87                 return &slcr_base->fpga1_clk_ctrl;
  88         case fclk2_clk:
  89                 return &slcr_base->fpga2_clk_ctrl;
  90         case fclk3_clk:
  91                 return &slcr_base->fpga3_clk_ctrl;
  92         case can0_clk ... can1_clk:
  93                 return &slcr_base->can_clk_ctrl;
  94         case dbg_trc_clk ... dbg_apb_clk:
  95                 /* fall through */
  96 #endif
  97         default:
  98                 return &slcr_base->dbg_clk_ctrl;
  99         }
 100 }
 101
 102 static enum zynq_clk zynq_clk_get_cpu_pll(u32 clk_ctrl)
 103 {
 104         u32 srcsel = (clk_ctrl & CLK_CTRL_SRCSEL_MASK) >> CLK_CTRL_SRCSEL_SHIFT;
 105
 106         switch (srcsel) {
 107         case 2:
 108                 return ddrpll_clk;
 109         case 3:
 110                 return iopll_clk;
 111         case 0 ... 1:
 112         default:
 113                 return armpll_clk;
 114         }
 115 }
 116
 117 static enum zynq_clk zynq_clk_get_peripheral_pll(u32 clk_ctrl)
 118 {
 119         u32 srcsel = (clk_ctrl & CLK_CTRL_SRCSEL_MASK) >> CLK_CTRL_SRCSEL_SHIFT;
 120
 121         switch (srcsel) {
 122         case 2:
 123                 return armpll_clk;
 124         case 3:
 125                 return ddrpll_clk;
 126         case 0 ... 1:
 127         default:
 128                 return iopll_clk;
 129         }
 130 }
 131
 132 static ulong zynq_clk_get_pll_rate(struct zynq_clk_priv *priv, enum zynq_clk id)
 133 {
 134         u32 clk_ctrl, reset, pwrdwn, mul, bypass;
 135
 136         clk_ctrl = readl(zynq_clk_get_register(id));
 137
 138         reset = (clk_ctrl & PLLCTRL_RESET_MASK) >> PLLCTRL_RESET_SHIFT;
 139         pwrdwn = (clk_ctrl & PLLCTRL_PWRDWN_MASK) >> PLLCTRL_PWRDWN_SHIFT;
 140         if (reset || pwrdwn)
 141                 return 0;
 142
 143         bypass = clk_ctrl & PLLCTRL_BPFORCE_MASK;
 144         if (bypass)
 145                 mul = 1;
 146         else
 147                 mul = (clk_ctrl & PLLCTRL_FBDIV_MASK) >> PLLCTRL_FBDIV_SHIFT;
 148
 149         return priv->ps_clk_freq * mul;
 150 }
 151
 152 #ifndef CONFIG_SPL_BUILD
 153 static enum zynq_clk_rclk zynq_clk_get_gem_rclk(enum zynq_clk id)
 154 {
 155         u32 clk_ctrl, srcsel;
 156
 157         if (id == gem0_clk)
 158                 clk_ctrl = readl(&slcr_base->gem0_rclk_ctrl);
 159         else
 160                 clk_ctrl = readl(&slcr_base->gem1_rclk_ctrl);
 161
 162         srcsel = (clk_ctrl & CLK_CTRL_SRCSEL_MASK) >> CLK_CTRL_SRCSEL_SHIFT;
 163         if (srcsel)
 164                 return emio_clk;
 165         else
 166                 return mio_clk;
 167 }
 168 #endif
 169
 170 static ulong zynq_clk_get_cpu_rate(struct zynq_clk_priv *priv, enum zynq_clk id)
 171 {
 172         u32 clk_621, clk_ctrl, div;
 173         enum zynq_clk pll;
 174
 175         clk_ctrl = readl(&slcr_base->arm_clk_ctrl);
 176
 177         div = (clk_ctrl & CLK_CTRL_DIV0_MASK) >> CLK_CTRL_DIV0_SHIFT;
 178
 179         switch (id) {
 180         case cpu_1x_clk:
 181                 div *= 2;
 182                 /* fall through */
 183         case cpu_2x_clk:
 184                 clk_621 = readl(&slcr_base->clk_621_true) & 1;
 185                 div *= 2 + clk_621;
 186                 break;
 187         case cpu_3or2x_clk:
 188                 div *= 2;
 189                 /* fall through */
 190         case cpu_6or4x_clk:
 191                 break;
 192         default:
 193                 return 0;
 194         }
 195
 196         pll = zynq_clk_get_cpu_pll(clk_ctrl);
 197
 198         return DIV_ROUND_CLOSEST(zynq_clk_get_pll_rate(priv, pll), div);
 199 }
 200
 201 #ifndef CONFIG_SPL_BUILD
 202 static ulong zynq_clk_get_ddr2x_rate(struct zynq_clk_priv *priv)
 203 {
 204         u32 clk_ctrl, div;
 205
 206         clk_ctrl = readl(&slcr_base->ddr_clk_ctrl);
 207
 208         div = (clk_ctrl & CLK_CTRL_DIV2X_MASK) >> CLK_CTRL_DIV2X_SHIFT;
 209
 210         return DIV_ROUND_CLOSEST(zynq_clk_get_pll_rate(priv, ddrpll_clk), div);
 211 }
 212 #endif
 213
 214 static ulong zynq_clk_get_ddr3x_rate(struct zynq_clk_priv *priv)
 215 {
 216         u32 clk_ctrl, div;
 217
 218         clk_ctrl = readl(&slcr_base->ddr_clk_ctrl);
 219
 220         div = (clk_ctrl & CLK_CTRL_DIV3X_MASK) >> CLK_CTRL_DIV3X_SHIFT;
 221
 222         return DIV_ROUND_CLOSEST(zynq_clk_get_pll_rate(priv, ddrpll_clk), div);
 223 }
 224
 225 #ifndef CONFIG_SPL_BUILD
 226 static ulong zynq_clk_get_dci_rate(struct zynq_clk_priv *priv)
 227 {
 228         u32 clk_ctrl, div0, div1;
 229
 230         clk_ctrl = readl(&slcr_base->dci_clk_ctrl);
 231
 232         div0 = (clk_ctrl & CLK_CTRL_DIV0_MASK) >> CLK_CTRL_DIV0_SHIFT;
 233         div1 = (clk_ctrl & CLK_CTRL_DIV1_MASK) >> CLK_CTRL_DIV1_SHIFT;
 234
 235         return DIV_ROUND_CLOSEST(DIV_ROUND_CLOSEST(
 236                 zynq_clk_get_pll_rate(priv, ddrpll_clk), div0), div1);
 237 }
 238 #endif
 239
 240 static ulong zynq_clk_get_peripheral_rate(struct zynq_clk_priv *priv,
 241                                           enum zynq_clk id, bool two_divs)
 242 {
 243         enum zynq_clk pll;
 244         u32 clk_ctrl, div0;
 245         u32 div1 = 1;
 246
 247         clk_ctrl = readl(zynq_clk_get_register(id));
 248
 249         div0 = (clk_ctrl & CLK_CTRL_DIV0_MASK) >> CLK_CTRL_DIV0_SHIFT;
 250         if (!div0)
 251                 div0 = 1;
 252
 253 #ifndef CONFIG_SPL_BUILD
 254         if (two_divs) {
 255                 div1 = (clk_ctrl & CLK_CTRL_DIV1_MASK) >> CLK_CTRL_DIV1_SHIFT;
 256                 if (!div1)
 257                         div1 = 1;
 258         }
 259 #endif
 260
 261         pll = zynq_clk_get_peripheral_pll(clk_ctrl);
 262
 263         return
 264                 DIV_ROUND_CLOSEST(
 265                         DIV_ROUND_CLOSEST(
 266                                 zynq_clk_get_pll_rate(priv, pll), div0),
 267                         div1);
 268 }
 269
 270 #ifndef CONFIG_SPL_BUILD
 271 static ulong zynq_clk_get_gem_rate(struct zynq_clk_priv *priv, enum zynq_clk id)
 272 {
 273         struct clk *parent;
 274
 275         if (zynq_clk_get_gem_rclk(id) == mio_clk)
 276                 return zynq_clk_get_peripheral_rate(priv, id, true);
 277
 278         parent = &priv->gem_emio_clk[id - gem0_clk];
 279         if (parent->dev)
 280                 return clk_get_rate(parent);
 281
 282         debug("%s: gem%d emio rx clock source unknown\n", __func__,
 283               id - gem0_clk);
 284
 285         return -ENOSYS;
 286 }
 287
 288 static unsigned long zynq_clk_calc_peripheral_two_divs(ulong rate,
 289                                                        ulong pll_rate,
 290                                                        u32 *div0, u32 *div1)
 291 {
 292         long new_err, best_err = (long)(~0UL >> 1);
 293         ulong new_rate, best_rate = 0;
 294         u32 d0, d1;
 295
 296         for (d0 = 1; d0 <= ZYNQ_CLK_MAXDIV; d0++) {
 297                 for (d1 = 1; d1 <= ZYNQ_CLK_MAXDIV >> 1; d1++) {
 298                         new_rate = DIV_ROUND_CLOSEST(
 299                                         DIV_ROUND_CLOSEST(pll_rate, d0), d1);
 300                         new_err = abs(new_rate - rate);
 301
 302                         if (new_err < best_err) {
 303                                 *div0 = d0;
 304                                 *div1 = d1;
 305                                 best_err = new_err;
 306                                 best_rate = new_rate;
 307                         }
 308                 }
 309         }
 310
 311         return best_rate;
 312 }
 313
 314 static ulong zynq_clk_set_peripheral_rate(struct zynq_clk_priv *priv,
 315                                           enum zynq_clk id, ulong rate,
 316                                           bool two_divs)
 317 {
 318         enum zynq_clk pll;
 319         u32 clk_ctrl, div0 = 0, div1 = 0;
 320         ulong pll_rate, new_rate;
 321         u32 *reg;
 322
 323         reg = zynq_clk_get_register(id);
 324         clk_ctrl = readl(reg);
 325
 326         pll = zynq_clk_get_peripheral_pll(clk_ctrl);
 327         pll_rate = zynq_clk_get_pll_rate(priv, pll);
 328         clk_ctrl &= ~CLK_CTRL_DIV0_MASK;
 329         if (two_divs) {
 330                 clk_ctrl &= ~CLK_CTRL_DIV1_MASK;
 331                 new_rate = zynq_clk_calc_peripheral_two_divs(rate, pll_rate,
 332                                 &div0, &div1);
 333                 clk_ctrl |= div1 << CLK_CTRL_DIV1_SHIFT;
 334         } else {
 335                 div0 = DIV_ROUND_CLOSEST(pll_rate, rate);
 336                 if (div0 > ZYNQ_CLK_MAXDIV)
 337                         div0 = ZYNQ_CLK_MAXDIV;
 338                 new_rate = DIV_ROUND_CLOSEST(rate, div0);
 339         }
 340         clk_ctrl |= div0 << CLK_CTRL_DIV0_SHIFT;
 341
 342         zynq_slcr_unlock();
 343         writel(clk_ctrl, reg);
 344         zynq_slcr_lock();
 345
 346         return new_rate;
 347 }
 348
 349 static ulong zynq_clk_set_gem_rate(struct zynq_clk_priv *priv, enum zynq_clk id,
 350                                    ulong rate)
 351 {
 352         struct clk *parent;
 353
 354         if (zynq_clk_get_gem_rclk(id) == mio_clk)
 355                 return zynq_clk_set_peripheral_rate(priv, id, rate, true);
 356
 357         parent = &priv->gem_emio_clk[id - gem0_clk];
 358         if (parent->dev)
 359                 return clk_set_rate(parent, rate);
 360
 361         debug("%s: gem%d emio rx clock source unknown\n", __func__,
 362               id - gem0_clk);
 363
 364         return -ENOSYS;
 365 }
 366 #endif
 367
 368 #ifndef CONFIG_SPL_BUILD
 369 static ulong zynq_clk_get_rate(struct clk *clk)
 370 {
 371         struct zynq_clk_priv *priv = dev_get_priv(clk->dev);
 372         enum zynq_clk id = clk->id;
 373         bool two_divs = false;
 374
 375         switch (id) {
 376         case armpll_clk ... iopll_clk:
 377                 return zynq_clk_get_pll_rate(priv, id);
 378         case cpu_6or4x_clk ... cpu_1x_clk:
 379                 return zynq_clk_get_cpu_rate(priv, id);
 380         case ddr2x_clk:
 381                 return zynq_clk_get_ddr2x_rate(priv);
 382         case ddr3x_clk:
 383                 return zynq_clk_get_ddr3x_rate(priv);
 384         case dci_clk:
 385                 return zynq_clk_get_dci_rate(priv);
 386         case gem0_clk ... gem1_clk:
 387                 return zynq_clk_get_gem_rate(priv, id);
 388         case fclk0_clk ... can1_clk:
 389                 two_divs = true;
 390                 /* fall through */
 391         case dbg_trc_clk ... dbg_apb_clk:
 392         case lqspi_clk ... pcap_clk:
 393         case sdio0_clk ... spi1_clk:
 394                 return zynq_clk_get_peripheral_rate(priv, id, two_divs);
 395         case dma_clk:
 396                 return zynq_clk_get_cpu_rate(priv, cpu_2x_clk);
 397         case usb0_aper_clk ... smc_aper_clk:
 398                 return zynq_clk_get_cpu_rate(priv, cpu_1x_clk);
 399         default:
 400                 return -ENXIO;
 401         }
 402 }
 403
 404 static ulong zynq_clk_set_rate(struct clk *clk, ulong rate)
 405 {
 406         struct zynq_clk_priv *priv = dev_get_priv(clk->dev);
 407         enum zynq_clk id = clk->id;
 408         bool two_divs = false;
 409
 410         switch (id) {
 411         case gem0_clk ... gem1_clk:
 412                 return zynq_clk_set_gem_rate(priv, id, rate);
 413         case fclk0_clk ... can1_clk:
 414                 two_divs = true;
 415                 /* fall through */
 416         case lqspi_clk ... pcap_clk:
 417         case sdio0_clk ... spi1_clk:
 418         case dbg_trc_clk ... dbg_apb_clk:
 419                 return zynq_clk_set_peripheral_rate(priv, id, rate, two_divs);
 420         default:
 421                 return -ENXIO;
 422         }
 423 }
 424 #else
 425 static ulong zynq_clk_get_rate(struct clk *clk)
 426 {
 427         struct zynq_clk_priv *priv = dev_get_priv(clk->dev);
 428         enum zynq_clk id = clk->id;
 429
 430         switch (id) {
 431         case cpu_6or4x_clk ... cpu_1x_clk:
 432                 return zynq_clk_get_cpu_rate(priv, id);
 433         case ddr3x_clk:
 434                 return zynq_clk_get_ddr3x_rate(priv);
 435         case lqspi_clk ... pcap_clk:
 436         case sdio0_clk ... spi1_clk:
 437                 return zynq_clk_get_peripheral_rate(priv, id, 0);
 438         default:
 439                 return -ENXIO;
 440         }
 441 }
 442 #endif
 443
 444 static struct clk_ops zynq_clk_ops = {
 445         .get_rate = zynq_clk_get_rate,
 446 #ifndef CONFIG_SPL_BUILD
 447         .set_rate = zynq_clk_set_rate,
 448 #endif
 449 };
 450
 451 static int zynq_clk_probe(struct udevice *dev)
 452 {
 453         struct zynq_clk_priv *priv = dev_get_priv(dev);
 454 #ifndef CONFIG_SPL_BUILD
 455         unsigned int i;
 456         char name[16];
 457         int ret;
 458
 459         for (i = 0; i < 2; i++) {
 460                 sprintf(name, "gem%d_emio_clk", i);
 461                 ret = clk_get_by_name(dev, name, &priv->gem_emio_clk[i]);
 462                 if (ret < 0 && ret != -FDT_ERR_NOTFOUND) {
 463                         dev_err(dev, "failed to get %s clock\n", name);
 464                         return ret;
 465                 }
 466         }
 467 #endif
 468
 469         priv->ps_clk_freq = fdtdec_get_uint(gd->fdt_blob, dev->of_offset,
 470                                             "ps-clk-frequency", 33333333UL);
 471
 472         return 0;
 473 }
 474
 475 static const struct udevice_id zynq_clk_ids[] = {
 476         { .compatible = "xlnx,ps7-clkc"},
 477         {}
 478 };
 479
 480 U_BOOT_DRIVER(zynq_clk) = {
 481         .name           = "zynq_clk",
 482         .id             = UCLASS_CLK,
 483         .of_match       = zynq_clk_ids,
 484         .flags          = DM_FLAG_PRE_RELOC,
 485         .ops            = &zynq_clk_ops,
 486         .priv_auto_alloc_size = sizeof(struct zynq_clk_priv),
 487         .probe          = zynq_clk_probe,
 488 };