arch/arm/cpu/armv7/exynos/clock.c

   1 /*
   2  * Copyright (C) 2010 Samsung Electronics
   3  * Minkyu Kang <mk7.kang@samsung.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <asm/io.h>
  10 #include <asm/arch/clock.h>
  11 #include <asm/arch/clk.h>
  12 #include <asm/arch/periph.h>
  13
  14 #define PLL_DIV_1024    1024
  15 #define PLL_DIV_65535   65535
  16 #define PLL_DIV_65536   65536
  17
  18 /* *
  19  * This structure is to store the src bit, div bit and prediv bit
  20  * positions of the peripheral clocks of the src and div registers
  21  */
  22 struct clk_bit_info {
  23         int8_t src_bit;
  24         int8_t div_bit;
  25         int8_t prediv_bit;
  26 };
  27
  28 /* src_bit div_bit prediv_bit */
  29 static struct clk_bit_info clk_bit_info[] = {
  30         {0,     0,      -1},
  31         {4,     4,      -1},
  32         {8,     8,      -1},
  33         {12,    12,     -1},
  34         {0,     0,      8},
  35         {4,     16,     24},
  36         {8,     0,      8},
  37         {12,    16,     24},
  38         {-1,    -1,     -1},
  39         {16,    0,      8},
  40         {20,    16,     24},
  41         {24,    0,      8},
  42         {0,     0,      4},
  43         {4,     12,     16},
  44         {-1,    -1,     -1},
  45         {-1,    -1,     -1},
  46         {-1,    24,     0},
  47         {-1,    24,     0},
  48         {-1,    24,     0},
  49         {-1,    24,     0},
  50         {-1,    24,     0},
  51         {-1,    24,     0},
  52         {-1,    24,     0},
  53         {-1,    24,     0},
  54         {24,    0,      -1},
  55         {24,    0,      -1},
  56         {24,    0,      -1},
  57         {24,    0,      -1},
  58         {24,    0,      -1},
  59 };
  60
  61 /* Epll Clock division values to achive different frequency output */
  62 static struct set_epll_con_val exynos5_epll_div[] = {
  63         { 192000000, 0, 48, 3, 1, 0 },
  64         { 180000000, 0, 45, 3, 1, 0 },
  65         {  73728000, 1, 73, 3, 3, 47710 },
  66         {  67737600, 1, 90, 4, 3, 20762 },
  67         {  49152000, 0, 49, 3, 3, 9961 },
  68         {  45158400, 0, 45, 3, 3, 10381 },
  69         { 180633600, 0, 45, 3, 1, 10381 }
  70 };
  71
  72 /* exynos: return pll clock frequency */
  73 static int exynos_get_pll_clk(int pllreg, unsigned int r, unsigned int k)
  74 {
  75         unsigned long m, p, s = 0, mask, fout;
  76         unsigned int div;
  77         unsigned int freq;
  78         /*
  79          * APLL_CON: MIDV [25:16]
  80          * MPLL_CON: MIDV [25:16]
  81          * EPLL_CON: MIDV [24:16]
  82          * VPLL_CON: MIDV [24:16]
  83          * BPLL_CON: MIDV [25:16]: Exynos5
  84          */
  85         if (pllreg == APLL || pllreg == MPLL || pllreg == BPLL)
  86                 mask = 0x3ff;
  87         else
  88                 mask = 0x1ff;
  89
  90         m = (r >> 16) & mask;
  91
  92         /* PDIV [13:8] */
  93         p = (r >> 8) & 0x3f;
  94         /* SDIV [2:0] */
  95         s = r & 0x7;
  96
  97         freq = CONFIG_SYS_CLK_FREQ;
  98
  99         if (pllreg == EPLL || pllreg == RPLL) {
 100                 k = k & 0xffff;
 101                 /* FOUT = (MDIV + K / 65536) * FIN / (PDIV * 2^SDIV) */
 102                 fout = (m + k / PLL_DIV_65536) * (freq / (p * (1 << s)));
 103         } else if (pllreg == VPLL) {
 104                 k = k & 0xfff;
 105
 106                 /*
 107                  * Exynos4210
 108                  * FOUT = (MDIV + K / 1024) * FIN / (PDIV * 2^SDIV)
 109                  *
 110                  * Exynos4412
 111                  * FOUT = (MDIV + K / 65535) * FIN / (PDIV * 2^SDIV)
 112                  *
 113                  * Exynos5250
 114                  * FOUT = (MDIV + K / 65536) * FIN / (PDIV * 2^SDIV)
 115                  */
 116                 if (proid_is_exynos4210())
 117                         div = PLL_DIV_1024;
 118                 else if (proid_is_exynos4412())
 119                         div = PLL_DIV_65535;
 120                 else if (proid_is_exynos5250() || proid_is_exynos5420())
 121                         div = PLL_DIV_65536;
 122                 else
 123                         return 0;
 124
 125                 fout = (m + k / div) * (freq / (p * (1 << s)));
 126         } else {
 127                 /*
 128                  * Exynos4412 / Exynos5250
 129                  * FOUT = MDIV * FIN / (PDIV * 2^SDIV)
 130                  *
 131                  * Exynos4210
 132                  * FOUT = MDIV * FIN / (PDIV * 2^(SDIV-1))
 133                  */
 134                 if (proid_is_exynos4210())
 135                         fout = m * (freq / (p * (1 << (s - 1))));
 136                 else
 137                         fout = m * (freq / (p * (1 << s)));
 138         }
 139         return fout;
 140 }
 141
 142 /* exynos4: return pll clock frequency */
 143 static unsigned long exynos4_get_pll_clk(int pllreg)
 144 {
 145         struct exynos4_clock *clk =
 146                 (struct exynos4_clock *)samsung_get_base_clock();
 147         unsigned long r, k = 0;
 148
 149         switch (pllreg) {
 150         case APLL:
 151                 r = readl(&clk->apll_con0);
 152                 break;
 153         case MPLL:
 154                 r = readl(&clk->mpll_con0);
 155                 break;
 156         case EPLL:
 157                 r = readl(&clk->epll_con0);
 158                 k = readl(&clk->epll_con1);
 159                 break;
 160         case VPLL:
 161                 r = readl(&clk->vpll_con0);
 162                 k = readl(&clk->vpll_con1);
 163                 break;
 164         default:
 165                 printf("Unsupported PLL (%d)\n", pllreg);
 166                 return 0;
 167         }
 168
 169         return exynos_get_pll_clk(pllreg, r, k);
 170 }
 171
 172 /* exynos4x12: return pll clock frequency */
 173 static unsigned long exynos4x12_get_pll_clk(int pllreg)
 174 {
 175         struct exynos4x12_clock *clk =
 176                 (struct exynos4x12_clock *)samsung_get_base_clock();
 177         unsigned long r, k = 0;
 178
 179         switch (pllreg) {
 180         case APLL:
 181                 r = readl(&clk->apll_con0);
 182                 break;
 183         case MPLL:
 184                 r = readl(&clk->mpll_con0);
 185                 break;
 186         case EPLL:
 187                 r = readl(&clk->epll_con0);
 188                 k = readl(&clk->epll_con1);
 189                 break;
 190         case VPLL:
 191                 r = readl(&clk->vpll_con0);
 192                 k = readl(&clk->vpll_con1);
 193                 break;
 194         default:
 195                 printf("Unsupported PLL (%d)\n", pllreg);
 196                 return 0;
 197         }
 198
 199         return exynos_get_pll_clk(pllreg, r, k);
 200 }
 201
 202 /* exynos5: return pll clock frequency */
 203 static unsigned long exynos5_get_pll_clk(int pllreg)
 204 {
 205         struct exynos5_clock *clk =
 206                 (struct exynos5_clock *)samsung_get_base_clock();
 207         unsigned long r, k = 0, fout;
 208         unsigned int pll_div2_sel, fout_sel;
 209
 210         switch (pllreg) {
 211         case APLL:
 212                 r = readl(&clk->apll_con0);
 213                 break;
 214         case MPLL:
 215                 r = readl(&clk->mpll_con0);
 216                 break;
 217         case EPLL:
 218                 r = readl(&clk->epll_con0);
 219                 k = readl(&clk->epll_con1);
 220                 break;
 221         case VPLL:
 222                 r = readl(&clk->vpll_con0);
 223                 k = readl(&clk->vpll_con1);
 224                 break;
 225         case BPLL:
 226                 r = readl(&clk->bpll_con0);
 227                 break;
 228         default:
 229                 printf("Unsupported PLL (%d)\n", pllreg);
 230                 return 0;
 231         }
 232
 233         fout = exynos_get_pll_clk(pllreg, r, k);
 234
 235         /* According to the user manual, in EVT1 MPLL and BPLL always gives
 236          * 1.6GHz clock, so divide by 2 to get 800MHz MPLL clock.*/
 237         if (pllreg == MPLL || pllreg == BPLL) {
 238                 pll_div2_sel = readl(&clk->pll_div2_sel);
 239
 240                 switch (pllreg) {
 241                 case MPLL:
 242                         fout_sel = (pll_div2_sel >> MPLL_FOUT_SEL_SHIFT)
 243                                         & MPLL_FOUT_SEL_MASK;
 244                         break;
 245                 case BPLL:
 246                         fout_sel = (pll_div2_sel >> BPLL_FOUT_SEL_SHIFT)
 247                                         & BPLL_FOUT_SEL_MASK;
 248                         break;
 249                 default:
 250                         fout_sel = -1;
 251                         break;
 252                 }
 253
 254                 if (fout_sel == 0)
 255                         fout /= 2;
 256         }
 257
 258         return fout;
 259 }
 260
 261 static unsigned long exynos5_get_periph_rate(int peripheral)
 262 {
 263         struct clk_bit_info *bit_info = &clk_bit_info[peripheral];
 264         unsigned long sclk, sub_clk;
 265         unsigned int src, div, sub_div;
 266         struct exynos5_clock *clk =
 267                         (struct exynos5_clock *)samsung_get_base_clock();
 268
 269         switch (peripheral) {
 270         case PERIPH_ID_UART0:
 271         case PERIPH_ID_UART1:
 272         case PERIPH_ID_UART2:
 273         case PERIPH_ID_UART3:
 274                 src = readl(&clk->src_peric0);
 275                 div = readl(&clk->div_peric0);
 276                 break;
 277         case PERIPH_ID_PWM0:
 278         case PERIPH_ID_PWM1:
 279         case PERIPH_ID_PWM2:
 280         case PERIPH_ID_PWM3:
 281         case PERIPH_ID_PWM4:
 282                 src = readl(&clk->src_peric0);
 283                 div = readl(&clk->div_peric3);
 284                 break;
 285         case PERIPH_ID_I2S0:
 286                 src = readl(&clk->src_mau);
 287                 div = readl(&clk->div_mau);
 288         case PERIPH_ID_SPI0:
 289         case PERIPH_ID_SPI1:
 290                 src = readl(&clk->src_peric1);
 291                 div = readl(&clk->div_peric1);
 292                 break;
 293         case PERIPH_ID_SPI2:
 294                 src = readl(&clk->src_peric1);
 295                 div = readl(&clk->div_peric2);
 296                 break;
 297         case PERIPH_ID_SPI3:
 298         case PERIPH_ID_SPI4:
 299                 src = readl(&clk->sclk_src_isp);
 300                 div = readl(&clk->sclk_div_isp);
 301                 break;
 302         case PERIPH_ID_SDMMC0:
 303         case PERIPH_ID_SDMMC1:
 304         case PERIPH_ID_SDMMC2:
 305         case PERIPH_ID_SDMMC3:
 306                 src = readl(&clk->src_fsys);
 307                 div = readl(&clk->div_fsys1);
 308                 break;
 309         case PERIPH_ID_I2C0:
 310         case PERIPH_ID_I2C1:
 311         case PERIPH_ID_I2C2:
 312         case PERIPH_ID_I2C3:
 313         case PERIPH_ID_I2C4:
 314         case PERIPH_ID_I2C5:
 315         case PERIPH_ID_I2C6:
 316         case PERIPH_ID_I2C7:
 317                 sclk = exynos5_get_pll_clk(MPLL);
 318                 sub_div = ((readl(&clk->div_top1) >> bit_info->div_bit)
 319                                                                 & 0x7) + 1;
 320                 div = ((readl(&clk->div_top0) >> bit_info->prediv_bit)
 321                                                                 & 0x7) + 1;
 322                 return (sclk / sub_div) / div;
 323         default:
 324                 debug("%s: invalid peripheral %d", __func__, peripheral);
 325                 return -1;
 326         };
 327
 328         src = (src >> bit_info->src_bit) & 0xf;
 329
 330         switch (src) {
 331         case EXYNOS_SRC_MPLL:
 332                 sclk = exynos5_get_pll_clk(MPLL);
 333                 break;
 334         case EXYNOS_SRC_EPLL:
 335                 sclk = exynos5_get_pll_clk(EPLL);
 336                 break;
 337         case EXYNOS_SRC_VPLL:
 338                 sclk = exynos5_get_pll_clk(VPLL);
 339                 break;
 340         default:
 341                 return 0;
 342         }
 343
 344         /* Ratio clock division for this peripheral */
 345         sub_div = (div >> bit_info->div_bit) & 0xf;
 346         sub_clk = sclk / (sub_div + 1);
 347
 348         /* Pre-ratio clock division for SDMMC0 and 2 */
 349         if (peripheral == PERIPH_ID_SDMMC0 || peripheral == PERIPH_ID_SDMMC2) {
 350                 div = (div >> bit_info->prediv_bit) & 0xff;
 351                 return sub_clk / (div + 1);
 352         }
 353
 354         return sub_clk;
 355 }
 356
 357 unsigned long clock_get_periph_rate(int peripheral)
 358 {
 359         if (cpu_is_exynos5())
 360                 return exynos5_get_periph_rate(peripheral);
 361         else
 362                 return 0;
 363 }
 364
 365 /* exynos5420: return pll clock frequency */
 366 static unsigned long exynos5420_get_pll_clk(int pllreg)
 367 {
 368         struct exynos5420_clock *clk =
 369                 (struct exynos5420_clock *)samsung_get_base_clock();
 370         unsigned long r, k = 0;
 371
 372         switch (pllreg) {
 373         case APLL:
 374                 r = readl(&clk->apll_con0);
 375                 break;
 376         case MPLL:
 377                 r = readl(&clk->mpll_con0);
 378                 break;
 379         case EPLL:
 380                 r = readl(&clk->epll_con0);
 381                 k = readl(&clk->epll_con1);
 382                 break;
 383         case VPLL:
 384                 r = readl(&clk->vpll_con0);
 385                 k = readl(&clk->vpll_con1);
 386                 break;
 387         case BPLL:
 388                 r = readl(&clk->bpll_con0);
 389                 break;
 390         case RPLL:
 391                 r = readl(&clk->rpll_con0);
 392                 k = readl(&clk->rpll_con1);
 393                 break;
 394         default:
 395                 printf("Unsupported PLL (%d)\n", pllreg);
 396                 return 0;
 397         }
 398
 399         return exynos_get_pll_clk(pllreg, r, k);
 400 }
 401
 402 /* exynos4: return ARM clock frequency */
 403 static unsigned long exynos4_get_arm_clk(void)
 404 {
 405         struct exynos4_clock *clk =
 406                 (struct exynos4_clock *)samsung_get_base_clock();
 407         unsigned long div;
 408         unsigned long armclk;
 409         unsigned int core_ratio;
 410         unsigned int core2_ratio;
 411
 412         div = readl(&clk->div_cpu0);
 413
 414         /* CORE_RATIO: [2:0], CORE2_RATIO: [30:28] */
 415         core_ratio = (div >> 0) & 0x7;
 416         core2_ratio = (div >> 28) & 0x7;
 417
 418         armclk = get_pll_clk(APLL) / (core_ratio + 1);
 419         armclk /= (core2_ratio + 1);
 420
 421         return armclk;
 422 }
 423
 424 /* exynos4x12: return ARM clock frequency */
 425 static unsigned long exynos4x12_get_arm_clk(void)
 426 {
 427         struct exynos4x12_clock *clk =
 428                 (struct exynos4x12_clock *)samsung_get_base_clock();
 429         unsigned long div;
 430         unsigned long armclk;
 431         unsigned int core_ratio;
 432         unsigned int core2_ratio;
 433
 434         div = readl(&clk->div_cpu0);
 435
 436         /* CORE_RATIO: [2:0], CORE2_RATIO: [30:28] */
 437         core_ratio = (div >> 0) & 0x7;
 438         core2_ratio = (div >> 28) & 0x7;
 439
 440         armclk = get_pll_clk(APLL) / (core_ratio + 1);
 441         armclk /= (core2_ratio + 1);
 442
 443         return armclk;
 444 }
 445
 446 /* exynos5: return ARM clock frequency */
 447 static unsigned long exynos5_get_arm_clk(void)
 448 {
 449         struct exynos5_clock *clk =
 450                 (struct exynos5_clock *)samsung_get_base_clock();
 451         unsigned long div;
 452         unsigned long armclk;
 453         unsigned int arm_ratio;
 454         unsigned int arm2_ratio;
 455
 456         div = readl(&clk->div_cpu0);
 457
 458         /* ARM_RATIO: [2:0], ARM2_RATIO: [30:28] */
 459         arm_ratio = (div >> 0) & 0x7;
 460         arm2_ratio = (div >> 28) & 0x7;
 461
 462         armclk = get_pll_clk(APLL) / (arm_ratio + 1);
 463         armclk /= (arm2_ratio + 1);
 464
 465         return armclk;
 466 }
 467
 468 /* exynos4: return pwm clock frequency */
 469 static unsigned long exynos4_get_pwm_clk(void)
 470 {
 471         struct exynos4_clock *clk =
 472                 (struct exynos4_clock *)samsung_get_base_clock();
 473         unsigned long pclk, sclk;
 474         unsigned int sel;
 475         unsigned int ratio;
 476
 477         if (s5p_get_cpu_rev() == 0) {
 478                 /*
 479                  * CLK_SRC_PERIL0
 480                  * PWM_SEL [27:24]
 481                  */
 482                 sel = readl(&clk->src_peril0);
 483                 sel = (sel >> 24) & 0xf;
 484
 485                 if (sel == 0x6)
 486                         sclk = get_pll_clk(MPLL);
 487                 else if (sel == 0x7)
 488                         sclk = get_pll_clk(EPLL);
 489                 else if (sel == 0x8)
 490                         sclk = get_pll_clk(VPLL);
 491                 else
 492                         return 0;
 493
 494                 /*
 495                  * CLK_DIV_PERIL3
 496                  * PWM_RATIO [3:0]
 497                  */
 498                 ratio = readl(&clk->div_peril3);
 499                 ratio = ratio & 0xf;
 500         } else if (s5p_get_cpu_rev() == 1) {
 501                 sclk = get_pll_clk(MPLL);
 502                 ratio = 8;
 503         } else
 504                 return 0;
 505
 506         pclk = sclk / (ratio + 1);
 507
 508         return pclk;
 509 }
 510
 511 /* exynos4x12: return pwm clock frequency */
 512 static unsigned long exynos4x12_get_pwm_clk(void)
 513 {
 514         unsigned long pclk, sclk;
 515         unsigned int ratio;
 516
 517         sclk = get_pll_clk(MPLL);
 518         ratio = 8;
 519
 520         pclk = sclk / (ratio + 1);
 521
 522         return pclk;
 523 }
 524
 525 /* exynos5420: return pwm clock frequency */
 526 static unsigned long exynos5420_get_pwm_clk(void)
 527 {
 528         struct exynos5420_clock *clk =
 529                 (struct exynos5420_clock *)samsung_get_base_clock();
 530         unsigned long pclk, sclk;
 531         unsigned int ratio;
 532
 533         /*
 534          * CLK_DIV_PERIC0
 535          * PWM_RATIO [31:28]
 536          */
 537         ratio = readl(&clk->div_peric0);
 538         ratio = (ratio >> 28) & 0xf;
 539         sclk = get_pll_clk(MPLL);
 540
 541         pclk = sclk / (ratio + 1);
 542
 543         return pclk;
 544 }
 545
 546 /* exynos4: return uart clock frequency */
 547 static unsigned long exynos4_get_uart_clk(int dev_index)
 548 {
 549         struct exynos4_clock *clk =
 550                 (struct exynos4_clock *)samsung_get_base_clock();
 551         unsigned long uclk, sclk;
 552         unsigned int sel;
 553         unsigned int ratio;
 554
 555         /*
 556          * CLK_SRC_PERIL0
 557          * UART0_SEL [3:0]
 558          * UART1_SEL [7:4]
 559          * UART2_SEL [8:11]
 560          * UART3_SEL [12:15]
 561          * UART4_SEL [16:19]
 562          * UART5_SEL [23:20]
 563          */
 564         sel = readl(&clk->src_peril0);
 565         sel = (sel >> (dev_index << 2)) & 0xf;
 566
 567         if (sel == 0x6)
 568                 sclk = get_pll_clk(MPLL);
 569         else if (sel == 0x7)
 570                 sclk = get_pll_clk(EPLL);
 571         else if (sel == 0x8)
 572                 sclk = get_pll_clk(VPLL);
 573         else
 574                 return 0;
 575
 576         /*
 577          * CLK_DIV_PERIL0
 578          * UART0_RATIO [3:0]
 579          * UART1_RATIO [7:4]
 580          * UART2_RATIO [8:11]
 581          * UART3_RATIO [12:15]
 582          * UART4_RATIO [16:19]
 583          * UART5_RATIO [23:20]
 584          */
 585         ratio = readl(&clk->div_peril0);
 586         ratio = (ratio >> (dev_index << 2)) & 0xf;
 587
 588         uclk = sclk / (ratio + 1);
 589
 590         return uclk;
 591 }
 592
 593 /* exynos4x12: return uart clock frequency */
 594 static unsigned long exynos4x12_get_uart_clk(int dev_index)
 595 {
 596         struct exynos4x12_clock *clk =
 597                 (struct exynos4x12_clock *)samsung_get_base_clock();
 598         unsigned long uclk, sclk;
 599         unsigned int sel;
 600         unsigned int ratio;
 601
 602         /*
 603          * CLK_SRC_PERIL0
 604          * UART0_SEL [3:0]
 605          * UART1_SEL [7:4]
 606          * UART2_SEL [8:11]
 607          * UART3_SEL [12:15]
 608          * UART4_SEL [16:19]
 609          */
 610         sel = readl(&clk->src_peril0);
 611         sel = (sel >> (dev_index << 2)) & 0xf;
 612
 613         if (sel == 0x6)
 614                 sclk = get_pll_clk(MPLL);
 615         else if (sel == 0x7)
 616                 sclk = get_pll_clk(EPLL);
 617         else if (sel == 0x8)
 618                 sclk = get_pll_clk(VPLL);
 619         else
 620                 return 0;
 621
 622         /*
 623          * CLK_DIV_PERIL0
 624          * UART0_RATIO [3:0]
 625          * UART1_RATIO [7:4]
 626          * UART2_RATIO [8:11]
 627          * UART3_RATIO [12:15]
 628          * UART4_RATIO [16:19]
 629          */
 630         ratio = readl(&clk->div_peril0);
 631         ratio = (ratio >> (dev_index << 2)) & 0xf;
 632
 633         uclk = sclk / (ratio + 1);
 634
 635         return uclk;
 636 }
 637
 638 /* exynos5: return uart clock frequency */
 639 static unsigned long exynos5_get_uart_clk(int dev_index)
 640 {
 641         struct exynos5_clock *clk =
 642                 (struct exynos5_clock *)samsung_get_base_clock();
 643         unsigned long uclk, sclk;
 644         unsigned int sel;
 645         unsigned int ratio;
 646
 647         /*
 648          * CLK_SRC_PERIC0
 649          * UART0_SEL [3:0]
 650          * UART1_SEL [7:4]
 651          * UART2_SEL [8:11]
 652          * UART3_SEL [12:15]
 653          * UART4_SEL [16:19]
 654          * UART5_SEL [23:20]
 655          */
 656         sel = readl(&clk->src_peric0);
 657         sel = (sel >> (dev_index << 2)) & 0xf;
 658
 659         if (sel == 0x6)
 660                 sclk = get_pll_clk(MPLL);
 661         else if (sel == 0x7)
 662                 sclk = get_pll_clk(EPLL);
 663         else if (sel == 0x8)
 664                 sclk = get_pll_clk(VPLL);
 665         else
 666                 return 0;
 667
 668         /*
 669          * CLK_DIV_PERIC0
 670          * UART0_RATIO [3:0]
 671          * UART1_RATIO [7:4]
 672          * UART2_RATIO [8:11]
 673          * UART3_RATIO [12:15]
 674          * UART4_RATIO [16:19]
 675          * UART5_RATIO [23:20]
 676          */
 677         ratio = readl(&clk->div_peric0);
 678         ratio = (ratio >> (dev_index << 2)) & 0xf;
 679
 680         uclk = sclk / (ratio + 1);
 681
 682         return uclk;
 683 }
 684
 685 /* exynos5420: return uart clock frequency */
 686 static unsigned long exynos5420_get_uart_clk(int dev_index)
 687 {
 688         struct exynos5420_clock *clk =
 689                 (struct exynos5420_clock *)samsung_get_base_clock();
 690         unsigned long uclk, sclk;
 691         unsigned int sel;
 692         unsigned int ratio;
 693
 694         /*
 695          * CLK_SRC_PERIC0
 696          * UART0_SEL [6:4]
 697          * UART1_SEL [10:8]
 698          * UART2_SEL [14:12]
 699          * UART3_SEL [18:16]
 700          * generalised calculation as follows
 701          * sel = (sel >> ((dev_index * 4) + 4)) & mask;
 702          */
 703         sel = readl(&clk->src_peric0);
 704         sel = (sel >> ((dev_index * 4) + 4)) & 0x7;
 705
 706         if (sel == 0x3)
 707                 sclk = get_pll_clk(MPLL);
 708         else if (sel == 0x6)
 709                 sclk = get_pll_clk(EPLL);
 710         else if (sel == 0x7)
 711                 sclk = get_pll_clk(RPLL);
 712         else
 713                 return 0;
 714
 715         /*
 716          * CLK_DIV_PERIC0
 717          * UART0_RATIO [11:8]
 718          * UART1_RATIO [15:12]
 719          * UART2_RATIO [19:16]
 720          * UART3_RATIO [23:20]
 721          * generalised calculation as follows
 722          * ratio = (ratio >> ((dev_index * 4) + 8)) & mask;
 723          */
 724         ratio = readl(&clk->div_peric0);
 725         ratio = (ratio >> ((dev_index * 4) + 8)) & 0xf;
 726
 727         uclk = sclk / (ratio + 1);
 728
 729         return uclk;
 730 }
 731
 732 static unsigned long exynos4_get_mmc_clk(int dev_index)
 733 {
 734         struct exynos4_clock *clk =
 735                 (struct exynos4_clock *)samsung_get_base_clock();
 736         unsigned long uclk, sclk;
 737         unsigned int sel, ratio, pre_ratio;
 738         int shift = 0;
 739
 740         sel = readl(&clk->src_fsys);
 741         sel = (sel >> (dev_index << 2)) & 0xf;
 742
 743         if (sel == 0x6)
 744                 sclk = get_pll_clk(MPLL);
 745         else if (sel == 0x7)
 746                 sclk = get_pll_clk(EPLL);
 747         else if (sel == 0x8)
 748                 sclk = get_pll_clk(VPLL);
 749         else
 750                 return 0;
 751
 752         switch (dev_index) {
 753         case 0:
 754         case 1:
 755                 ratio = readl(&clk->div_fsys1);
 756                 pre_ratio = readl(&clk->div_fsys1);
 757                 break;
 758         case 2:
 759         case 3:
 760                 ratio = readl(&clk->div_fsys2);
 761                 pre_ratio = readl(&clk->div_fsys2);
 762                 break;
 763         case 4:
 764                 ratio = readl(&clk->div_fsys3);
 765                 pre_ratio = readl(&clk->div_fsys3);
 766                 break;
 767         default:
 768                 return 0;
 769         }
 770
 771         if (dev_index == 1 || dev_index == 3)
 772                 shift = 16;
 773
 774         ratio = (ratio >> shift) & 0xf;
 775         pre_ratio = (pre_ratio >> (shift + 8)) & 0xff;
 776         uclk = (sclk / (ratio + 1)) / (pre_ratio + 1);
 777
 778         return uclk;
 779 }
 780
 781 static unsigned long exynos5_get_mmc_clk(int dev_index)
 782 {
 783         struct exynos5_clock *clk =
 784                 (struct exynos5_clock *)samsung_get_base_clock();
 785         unsigned long uclk, sclk;
 786         unsigned int sel, ratio, pre_ratio;
 787         int shift = 0;
 788
 789         sel = readl(&clk->src_fsys);
 790         sel = (sel >> (dev_index << 2)) & 0xf;
 791
 792         if (sel == 0x6)
 793                 sclk = get_pll_clk(MPLL);
 794         else if (sel == 0x7)
 795                 sclk = get_pll_clk(EPLL);
 796         else if (sel == 0x8)
 797                 sclk = get_pll_clk(VPLL);
 798         else
 799                 return 0;
 800
 801         switch (dev_index) {
 802         case 0:
 803         case 1:
 804                 ratio = readl(&clk->div_fsys1);
 805                 pre_ratio = readl(&clk->div_fsys1);
 806                 break;
 807         case 2:
 808         case 3:
 809                 ratio = readl(&clk->div_fsys2);
 810                 pre_ratio = readl(&clk->div_fsys2);
 811                 break;
 812         default:
 813                 return 0;
 814         }
 815
 816         if (dev_index == 1 || dev_index == 3)
 817                 shift = 16;
 818
 819         ratio = (ratio >> shift) & 0xf;
 820         pre_ratio = (pre_ratio >> (shift + 8)) & 0xff;
 821         uclk = (sclk / (ratio + 1)) / (pre_ratio + 1);
 822
 823         return uclk;
 824 }
 825
 826 static unsigned long exynos5420_get_mmc_clk(int dev_index)
 827 {
 828         struct exynos5420_clock *clk =
 829                 (struct exynos5420_clock *)samsung_get_base_clock();
 830         unsigned long uclk, sclk;
 831         unsigned int sel, ratio;
 832
 833         /*
 834          * CLK_SRC_FSYS
 835          * MMC0_SEL [10:8]
 836          * MMC1_SEL [14:12]
 837          * MMC2_SEL [18:16]
 838          * generalised calculation as follows
 839          * sel = (sel >> ((dev_index * 4) + 8)) & mask
 840          */
 841         sel = readl(&clk->src_fsys);
 842         sel = (sel >> ((dev_index * 4) + 8)) & 0x7;
 843
 844         if (sel == 0x3)
 845                 sclk = get_pll_clk(MPLL);
 846         else if (sel == 0x6)
 847                 sclk = get_pll_clk(EPLL);
 848         else
 849                 return 0;
 850
 851         /*
 852          * CLK_DIV_FSYS1
 853          * MMC0_RATIO [9:0]
 854          * MMC1_RATIO [19:10]
 855          * MMC2_RATIO [29:20]
 856          * generalised calculation as follows
 857          * ratio = (ratio >> (dev_index * 10)) & mask
 858          */
 859         ratio = readl(&clk->div_fsys1);
 860         ratio = (ratio >> (dev_index * 10)) & 0x3ff;
 861
 862         uclk = (sclk / (ratio + 1));
 863
 864         return uclk;
 865 }
 866
 867 /* exynos4: set the mmc clock */
 868 static void exynos4_set_mmc_clk(int dev_index, unsigned int div)
 869 {
 870         struct exynos4_clock *clk =
 871                 (struct exynos4_clock *)samsung_get_base_clock();
 872         unsigned int addr;
 873
 874         /*
 875          * CLK_DIV_FSYS1
 876          * MMC0_PRE_RATIO [15:8], MMC1_PRE_RATIO [31:24]
 877          * CLK_DIV_FSYS2
 878          * MMC2_PRE_RATIO [15:8], MMC3_PRE_RATIO [31:24]
 879          * CLK_DIV_FSYS3
 880          * MMC4_PRE_RATIO [15:8]
 881          */
 882         if (dev_index < 2) {
 883                 addr = (unsigned int)&clk->div_fsys1;
 884         }  else if (dev_index == 4) {
 885                 addr = (unsigned int)&clk->div_fsys3;
 886                 dev_index -= 4;
 887         } else {
 888                 addr = (unsigned int)&clk->div_fsys2;
 889                 dev_index -= 2;
 890         }
 891
 892         clrsetbits_le32(addr, 0xff << ((dev_index << 4) + 8),
 893                         (div & 0xff) << ((dev_index << 4) + 8));
 894 }
 895
 896 /* exynos5: set the mmc clock */
 897 static void exynos5_set_mmc_clk(int dev_index, unsigned int div)
 898 {
 899         struct exynos5_clock *clk =
 900                 (struct exynos5_clock *)samsung_get_base_clock();
 901         unsigned int addr;
 902
 903         /*
 904          * CLK_DIV_FSYS1
 905          * MMC0_PRE_RATIO [15:8], MMC1_PRE_RATIO [31:24]
 906          * CLK_DIV_FSYS2
 907          * MMC2_PRE_RATIO [15:8], MMC3_PRE_RATIO [31:24]
 908          */
 909         if (dev_index < 2) {
 910                 addr = (unsigned int)&clk->div_fsys1;
 911         } else {
 912                 addr = (unsigned int)&clk->div_fsys2;
 913                 dev_index -= 2;
 914         }
 915
 916         clrsetbits_le32(addr, 0xff << ((dev_index << 4) + 8),
 917                         (div & 0xff) << ((dev_index << 4) + 8));
 918 }
 919
 920 /* exynos5: set the mmc clock */
 921 static void exynos5420_set_mmc_clk(int dev_index, unsigned int div)
 922 {
 923         struct exynos5420_clock *clk =
 924                 (struct exynos5420_clock *)samsung_get_base_clock();
 925         unsigned int addr;
 926         unsigned int shift;
 927
 928         /*
 929          * CLK_DIV_FSYS1
 930          * MMC0_RATIO [9:0]
 931          * MMC1_RATIO [19:10]
 932          * MMC2_RATIO [29:20]
 933          */
 934         addr = (unsigned int)&clk->div_fsys1;
 935         shift = dev_index * 10;
 936
 937         clrsetbits_le32(addr, 0x3ff << shift, (div & 0x3ff) << shift);
 938 }
 939
 940 /* get_lcd_clk: return lcd clock frequency */
 941 static unsigned long exynos4_get_lcd_clk(void)
 942 {
 943         struct exynos4_clock *clk =
 944                 (struct exynos4_clock *)samsung_get_base_clock();
 945         unsigned long pclk, sclk;
 946         unsigned int sel;
 947         unsigned int ratio;
 948
 949         /*
 950          * CLK_SRC_LCD0
 951          * FIMD0_SEL [3:0]
 952          */
 953         sel = readl(&clk->src_lcd0);
 954         sel = sel & 0xf;
 955
 956         /*
 957          * 0x6: SCLK_MPLL
 958          * 0x7: SCLK_EPLL
 959          * 0x8: SCLK_VPLL
 960          */
 961         if (sel == 0x6)
 962                 sclk = get_pll_clk(MPLL);
 963         else if (sel == 0x7)
 964                 sclk = get_pll_clk(EPLL);
 965         else if (sel == 0x8)
 966                 sclk = get_pll_clk(VPLL);
 967         else
 968                 return 0;
 969
 970         /*
 971          * CLK_DIV_LCD0
 972          * FIMD0_RATIO [3:0]
 973          */
 974         ratio = readl(&clk->div_lcd0);
 975         ratio = ratio & 0xf;
 976
 977         pclk = sclk / (ratio + 1);
 978
 979         return pclk;
 980 }
 981
 982 /* get_lcd_clk: return lcd clock frequency */
 983 static unsigned long exynos5_get_lcd_clk(void)
 984 {
 985         struct exynos5_clock *clk =
 986                 (struct exynos5_clock *)samsung_get_base_clock();
 987         unsigned long pclk, sclk;
 988         unsigned int sel;
 989         unsigned int ratio;
 990
 991         /*
 992          * CLK_SRC_LCD0
 993          * FIMD0_SEL [3:0]
 994          */
 995         sel = readl(&clk->src_disp1_0);
 996         sel = sel & 0xf;
 997
 998         /*
 999          * 0x6: SCLK_MPLL
1000          * 0x7: SCLK_EPLL
1001          * 0x8: SCLK_VPLL
1002          */
1003         if (sel == 0x6)
1004                 sclk = get_pll_clk(MPLL);
1005         else if (sel == 0x7)
1006                 sclk = get_pll_clk(EPLL);
1007         else if (sel == 0x8)
1008                 sclk = get_pll_clk(VPLL);
1009         else
1010                 return 0;
1011
1012         /*
1013          * CLK_DIV_LCD0
1014          * FIMD0_RATIO [3:0]
1015          */
1016         ratio = readl(&clk->div_disp1_0);
1017         ratio = ratio & 0xf;
1018
1019         pclk = sclk / (ratio + 1);
1020
1021         return pclk;
1022 }
1023
1024 void exynos4_set_lcd_clk(void)
1025 {
1026         struct exynos4_clock *clk =
1027             (struct exynos4_clock *)samsung_get_base_clock();
1028
1029         /*
1030          * CLK_GATE_BLOCK
1031          * CLK_CAM      [0]
1032          * CLK_TV       [1]
1033          * CLK_MFC      [2]
1034          * CLK_G3D      [3]
1035          * CLK_LCD0     [4]
1036          * CLK_LCD1     [5]
1037          * CLK_GPS      [7]
1038          */
1039         setbits_le32(&clk->gate_block, 1 << 4);
1040
1041         /*
1042          * CLK_SRC_LCD0
1043          * FIMD0_SEL            [3:0]
1044          * MDNIE0_SEL           [7:4]
1045          * MDNIE_PWM0_SEL       [8:11]
1046          * MIPI0_SEL            [12:15]
1047          * set lcd0 src clock 0x6: SCLK_MPLL
1048          */
1049         clrsetbits_le32(&clk->src_lcd0, 0xf, 0x6);
1050
1051         /*
1052          * CLK_GATE_IP_LCD0
1053          * CLK_FIMD0            [0]
1054          * CLK_MIE0             [1]
1055          * CLK_MDNIE0           [2]
1056          * CLK_DSIM0            [3]
1057          * CLK_SMMUFIMD0        [4]
1058          * CLK_PPMULCD0         [5]
1059          * Gating all clocks for FIMD0
1060          */
1061         setbits_le32(&clk->gate_ip_lcd0, 1 << 0);
1062
1063         /*
1064          * CLK_DIV_LCD0
1065          * FIMD0_RATIO          [3:0]
1066          * MDNIE0_RATIO         [7:4]
1067          * MDNIE_PWM0_RATIO     [11:8]
1068          * MDNIE_PWM_PRE_RATIO  [15:12]
1069          * MIPI0_RATIO          [19:16]
1070          * MIPI0_PRE_RATIO      [23:20]
1071          * set fimd ratio
1072          */
1073         clrsetbits_le32(&clk->div_lcd0, 0xf, 0x1);
1074 }
1075
1076 void exynos5_set_lcd_clk(void)
1077 {
1078         struct exynos5_clock *clk =
1079             (struct exynos5_clock *)samsung_get_base_clock();
1080
1081         /*
1082          * CLK_GATE_BLOCK
1083          * CLK_CAM      [0]
1084          * CLK_TV       [1]
1085          * CLK_MFC      [2]
1086          * CLK_G3D      [3]
1087          * CLK_LCD0     [4]
1088          * CLK_LCD1     [5]
1089          * CLK_GPS      [7]
1090          */
1091         setbits_le32(&clk->gate_block, 1 << 4);
1092
1093         /*
1094          * CLK_SRC_LCD0
1095          * FIMD0_SEL            [3:0]
1096          * MDNIE0_SEL           [7:4]
1097          * MDNIE_PWM0_SEL       [8:11]
1098          * MIPI0_SEL            [12:15]
1099          * set lcd0 src clock 0x6: SCLK_MPLL
1100          */
1101         clrsetbits_le32(&clk->src_disp1_0, 0xf, 0x6);
1102
1103         /*
1104          * CLK_GATE_IP_LCD0
1105          * CLK_FIMD0            [0]
1106          * CLK_MIE0             [1]
1107          * CLK_MDNIE0           [2]
1108          * CLK_DSIM0            [3]
1109          * CLK_SMMUFIMD0        [4]
1110          * CLK_PPMULCD0         [5]
1111          * Gating all clocks for FIMD0
1112          */
1113         setbits_le32(&clk->gate_ip_disp1, 1 << 0);
1114
1115         /*
1116          * CLK_DIV_LCD0
1117          * FIMD0_RATIO          [3:0]
1118          * MDNIE0_RATIO         [7:4]
1119          * MDNIE_PWM0_RATIO     [11:8]
1120          * MDNIE_PWM_PRE_RATIO  [15:12]
1121          * MIPI0_RATIO          [19:16]
1122          * MIPI0_PRE_RATIO      [23:20]
1123          * set fimd ratio
1124          */
1125         clrsetbits_le32(&clk->div_disp1_0, 0xf, 0x0);
1126 }
1127
1128 void exynos4_set_mipi_clk(void)
1129 {
1130         struct exynos4_clock *clk =
1131             (struct exynos4_clock *)samsung_get_base_clock();
1132
1133         /*
1134          * CLK_SRC_LCD0
1135          * FIMD0_SEL            [3:0]
1136          * MDNIE0_SEL           [7:4]
1137          * MDNIE_PWM0_SEL       [8:11]
1138          * MIPI0_SEL            [12:15]
1139          * set mipi0 src clock 0x6: SCLK_MPLL
1140          */
1141         clrsetbits_le32(&clk->src_lcd0, 0xf << 12, 0x6 << 12);
1142
1143         /*
1144          * CLK_SRC_MASK_LCD0
1145          * FIMD0_MASK           [0]
1146          * MDNIE0_MASK          [4]
1147          * MDNIE_PWM0_MASK      [8]
1148          * MIPI0_MASK           [12]
1149          * set src mask mipi0 0x1: Unmask
1150          */
1151         setbits_le32(&clk->src_mask_lcd0, 0x1 << 12);
1152
1153         /*
1154          * CLK_GATE_IP_LCD0
1155          * CLK_FIMD0            [0]
1156          * CLK_MIE0             [1]
1157          * CLK_MDNIE0           [2]
1158          * CLK_DSIM0            [3]
1159          * CLK_SMMUFIMD0        [4]
1160          * CLK_PPMULCD0         [5]
1161          * Gating all clocks for MIPI0
1162          */
1163         setbits_le32(&clk->gate_ip_lcd0, 1 << 3);
1164
1165         /*
1166          * CLK_DIV_LCD0
1167          * FIMD0_RATIO          [3:0]
1168          * MDNIE0_RATIO         [7:4]
1169          * MDNIE_PWM0_RATIO     [11:8]
1170          * MDNIE_PWM_PRE_RATIO  [15:12]
1171          * MIPI0_RATIO          [19:16]
1172          * MIPI0_PRE_RATIO      [23:20]
1173          * set mipi ratio
1174          */
1175         clrsetbits_le32(&clk->div_lcd0, 0xf << 16, 0x1 << 16);
1176 }
1177
1178 /*
1179  * I2C
1180  *
1181  * exynos5: obtaining the I2C clock
1182  */
1183 static unsigned long exynos5_get_i2c_clk(void)
1184 {
1185         struct exynos5_clock *clk =
1186                 (struct exynos5_clock *)samsung_get_base_clock();
1187         unsigned long aclk_66, aclk_66_pre, sclk;
1188         unsigned int ratio;
1189
1190         sclk = get_pll_clk(MPLL);
1191
1192         ratio = (readl(&clk->div_top1)) >> 24;
1193         ratio &= 0x7;
1194         aclk_66_pre = sclk / (ratio + 1);
1195         ratio = readl(&clk->div_top0);
1196         ratio &= 0x7;
1197         aclk_66 = aclk_66_pre / (ratio + 1);
1198         return aclk_66;
1199 }
1200
1201 int exynos5_set_epll_clk(unsigned long rate)
1202 {
1203         unsigned int epll_con, epll_con_k;
1204         unsigned int i;
1205         unsigned int lockcnt;
1206         unsigned int start;
1207         struct exynos5_clock *clk =
1208                 (struct exynos5_clock *)samsung_get_base_clock();
1209
1210         epll_con = readl(&clk->epll_con0);
1211         epll_con &= ~((EPLL_CON0_LOCK_DET_EN_MASK <<
1212                         EPLL_CON0_LOCK_DET_EN_SHIFT) |
1213                 EPLL_CON0_MDIV_MASK << EPLL_CON0_MDIV_SHIFT |
1214                 EPLL_CON0_PDIV_MASK << EPLL_CON0_PDIV_SHIFT |
1215                 EPLL_CON0_SDIV_MASK << EPLL_CON0_SDIV_SHIFT);
1216
1217         for (i = 0; i < ARRAY_SIZE(exynos5_epll_div); i++) {
1218                 if (exynos5_epll_div[i].freq_out == rate)
1219                         break;
1220         }
1221
1222         if (i == ARRAY_SIZE(exynos5_epll_div))
1223                 return -1;
1224
1225         epll_con_k = exynos5_epll_div[i].k_dsm << 0;
1226         epll_con |= exynos5_epll_div[i].en_lock_det <<
1227                                 EPLL_CON0_LOCK_DET_EN_SHIFT;
1228         epll_con |= exynos5_epll_div[i].m_div << EPLL_CON0_MDIV_SHIFT;
1229         epll_con |= exynos5_epll_div[i].p_div << EPLL_CON0_PDIV_SHIFT;
1230         epll_con |= exynos5_epll_div[i].s_div << EPLL_CON0_SDIV_SHIFT;
1231
1232         /*
1233          * Required period ( in cycles) to genarate a stable clock output.
1234          * The maximum clock time can be up to 3000 * PDIV cycles of PLLs
1235          * frequency input (as per spec)
1236          */
1237         lockcnt = 3000 * exynos5_epll_div[i].p_div;
1238
1239         writel(lockcnt, &clk->epll_lock);
1240         writel(epll_con, &clk->epll_con0);
1241         writel(epll_con_k, &clk->epll_con1);
1242
1243         start = get_timer(0);
1244
1245          while (!(readl(&clk->epll_con0) &
1246                         (0x1 << EXYNOS5_EPLLCON0_LOCKED_SHIFT))) {
1247                 if (get_timer(start) > TIMEOUT_EPLL_LOCK) {
1248                         debug("%s: Timeout waiting for EPLL lock\n", __func__);
1249                         return -1;
1250                 }
1251         }
1252         return 0;
1253 }
1254
1255 int exynos5_set_i2s_clk_source(unsigned int i2s_id)
1256 {
1257         struct exynos5_clock *clk =
1258                 (struct exynos5_clock *)samsung_get_base_clock();
1259         unsigned int *audio_ass = (unsigned int *)samsung_get_base_audio_ass();
1260
1261         if (i2s_id == 0) {
1262                 setbits_le32(&clk->src_top2, CLK_SRC_MOUT_EPLL);
1263                 clrsetbits_le32(&clk->src_mau, AUDIO0_SEL_MASK,
1264                                 (CLK_SRC_SCLK_EPLL));
1265                 setbits_le32(audio_ass, AUDIO_CLKMUX_ASS);
1266         } else if (i2s_id == 1) {
1267                 clrsetbits_le32(&clk->src_peric1, AUDIO1_SEL_MASK,
1268                                 (CLK_SRC_SCLK_EPLL));
1269         } else {
1270                 return -1;
1271         }
1272         return 0;
1273 }
1274
1275 int exynos5_set_i2s_clk_prescaler(unsigned int src_frq,
1276                                   unsigned int dst_frq,
1277                                   unsigned int i2s_id)
1278 {
1279         struct exynos5_clock *clk =
1280                 (struct exynos5_clock *)samsung_get_base_clock();
1281         unsigned int div;
1282
1283         if ((dst_frq == 0) || (src_frq == 0)) {
1284                 debug("%s: Invalid requency input for prescaler\n", __func__);
1285                 debug("src frq = %d des frq = %d ", src_frq, dst_frq);
1286                 return -1;
1287         }
1288
1289         div = (src_frq / dst_frq);
1290         if (i2s_id == 0) {
1291                 if (div > AUDIO_0_RATIO_MASK) {
1292                         debug("%s: Frequency ratio is out of range\n",
1293                               __func__);
1294                         debug("src frq = %d des frq = %d ", src_frq, dst_frq);
1295                         return -1;
1296                 }
1297                 clrsetbits_le32(&clk->div_mau, AUDIO_0_RATIO_MASK,
1298                                 (div & AUDIO_0_RATIO_MASK));
1299         } else if(i2s_id == 1) {
1300                 if (div > AUDIO_1_RATIO_MASK) {
1301                         debug("%s: Frequency ratio is out of range\n",
1302                               __func__);
1303                         debug("src frq = %d des frq = %d ", src_frq, dst_frq);
1304                         return -1;
1305                 }
1306                 clrsetbits_le32(&clk->div_peric4, AUDIO_1_RATIO_MASK,
1307                                 (div & AUDIO_1_RATIO_MASK));
1308         } else {
1309                 return -1;
1310         }
1311         return 0;
1312 }
1313
1314 /**
1315  * Linearly searches for the most accurate main and fine stage clock scalars
1316  * (divisors) for a specified target frequency and scalar bit sizes by checking
1317  * all multiples of main_scalar_bits values. Will always return scalars up to or
1318  * slower than target.
1319  *
1320  * @param main_scalar_bits      Number of main scalar bits, must be > 0 and < 32
1321  * @param fine_scalar_bits      Number of fine scalar bits, must be > 0 and < 32
1322  * @param input_freq            Clock frequency to be scaled in Hz
1323  * @param target_freq           Desired clock frequency in Hz
1324  * @param best_fine_scalar      Pointer to store the fine stage divisor
1325  *
1326  * @return best_main_scalar     Main scalar for desired frequency or -1 if none
1327  * found
1328  */
1329 static int clock_calc_best_scalar(unsigned int main_scaler_bits,
1330         unsigned int fine_scalar_bits, unsigned int input_rate,
1331         unsigned int target_rate, unsigned int *best_fine_scalar)
1332 {
1333         int i;
1334         int best_main_scalar = -1;
1335         unsigned int best_error = target_rate;
1336         const unsigned int cap = (1 << fine_scalar_bits) - 1;
1337         const unsigned int loops = 1 << main_scaler_bits;
1338
1339         debug("Input Rate is %u, Target is %u, Cap is %u\n", input_rate,
1340                         target_rate, cap);
1341
1342         assert(best_fine_scalar != NULL);
1343         assert(main_scaler_bits <= fine_scalar_bits);
1344
1345         *best_fine_scalar = 1;
1346
1347         if (input_rate == 0 || target_rate == 0)
1348                 return -1;
1349
1350         if (target_rate >= input_rate)
1351                 return 1;
1352
1353         for (i = 1; i <= loops; i++) {
1354                 const unsigned int effective_div = max(min(input_rate / i /
1355                                                         target_rate, cap), 1);
1356                 const unsigned int effective_rate = input_rate / i /
1357                                                         effective_div;
1358                 const int error = target_rate - effective_rate;
1359
1360                 debug("%d|effdiv:%u, effrate:%u, error:%d\n", i, effective_div,
1361                                 effective_rate, error);
1362
1363                 if (error >= 0 && error <= best_error) {
1364                         best_error = error;
1365                         best_main_scalar = i;
1366                         *best_fine_scalar = effective_div;
1367                 }
1368         }
1369
1370         return best_main_scalar;
1371 }
1372
1373 static int exynos5_set_spi_clk(enum periph_id periph_id,
1374                                         unsigned int rate)
1375 {
1376         struct exynos5_clock *clk =
1377                 (struct exynos5_clock *)samsung_get_base_clock();
1378         int main;
1379         unsigned int fine;
1380         unsigned shift, pre_shift;
1381         unsigned mask = 0xff;
1382         u32 *reg;
1383
1384         main = clock_calc_best_scalar(4, 8, 400000000, rate, &fine);
1385         if (main < 0) {
1386                 debug("%s: Cannot set clock rate for periph %d",
1387                                 __func__, periph_id);
1388                 return -1;
1389         }
1390         main = main - 1;
1391         fine = fine - 1;
1392
1393         switch (periph_id) {
1394         case PERIPH_ID_SPI0:
1395                 reg = &clk->div_peric1;
1396                 shift = 0;
1397                 pre_shift = 8;
1398                 break;
1399         case PERIPH_ID_SPI1:
1400                 reg = &clk->div_peric1;
1401                 shift = 16;
1402                 pre_shift = 24;
1403                 break;
1404         case PERIPH_ID_SPI2:
1405                 reg = &clk->div_peric2;
1406                 shift = 0;
1407                 pre_shift = 8;
1408                 break;
1409         case PERIPH_ID_SPI3:
1410                 reg = &clk->sclk_div_isp;
1411                 shift = 0;
1412                 pre_shift = 4;
1413                 break;
1414         case PERIPH_ID_SPI4:
1415                 reg = &clk->sclk_div_isp;
1416                 shift = 12;
1417                 pre_shift = 16;
1418                 break;
1419         default:
1420                 debug("%s: Unsupported peripheral ID %d\n", __func__,
1421                       periph_id);
1422                 return -1;
1423         }
1424         clrsetbits_le32(reg, mask << shift, (main & mask) << shift);
1425         clrsetbits_le32(reg, mask << pre_shift, (fine & mask) << pre_shift);
1426
1427         return 0;
1428 }
1429
1430 static int exynos5420_set_spi_clk(enum periph_id periph_id,
1431                                         unsigned int rate)
1432 {
1433         struct exynos5420_clock *clk =
1434                 (struct exynos5420_clock *)samsung_get_base_clock();
1435         int main;
1436         unsigned int fine;
1437         unsigned shift, pre_shift;
1438         unsigned div_mask = 0xf, pre_div_mask = 0xff;
1439         u32 *reg;
1440         u32 *pre_reg;
1441
1442         main = clock_calc_best_scalar(4, 8, 400000000, rate, &fine);
1443         if (main < 0) {
1444                 debug("%s: Cannot set clock rate for periph %d",
1445                       __func__, periph_id);
1446                 return -1;
1447         }
1448         main = main - 1;
1449         fine = fine - 1;
1450
1451         switch (periph_id) {
1452         case PERIPH_ID_SPI0:
1453                 reg = &clk->div_peric1;
1454                 shift = 20;
1455                 pre_reg = &clk->div_peric4;
1456                 pre_shift = 8;
1457                 break;
1458         case PERIPH_ID_SPI1:
1459                 reg = &clk->div_peric1;
1460                 shift = 24;
1461                 pre_reg = &clk->div_peric4;
1462                 pre_shift = 16;
1463                 break;
1464         case PERIPH_ID_SPI2:
1465                 reg = &clk->div_peric1;
1466                 shift = 28;
1467                 pre_reg = &clk->div_peric4;
1468                 pre_shift = 24;
1469                 break;
1470         case PERIPH_ID_SPI3:
1471                 reg = &clk->div_isp1;
1472                 shift = 16;
1473                 pre_reg = &clk->div_isp1;
1474                 pre_shift = 0;
1475                 break;
1476         case PERIPH_ID_SPI4:
1477                 reg = &clk->div_isp1;
1478                 shift = 20;
1479                 pre_reg = &clk->div_isp1;
1480                 pre_shift = 8;
1481                 break;
1482         default:
1483                 debug("%s: Unsupported peripheral ID %d\n", __func__,
1484                       periph_id);
1485                 return -1;
1486         }
1487
1488         clrsetbits_le32(reg, div_mask << shift, (main & div_mask) << shift);
1489         clrsetbits_le32(pre_reg, pre_div_mask << pre_shift,
1490                         (fine & pre_div_mask) << pre_shift);
1491
1492         return 0;
1493 }
1494
1495 static unsigned long exynos4_get_i2c_clk(void)
1496 {
1497         struct exynos4_clock *clk =
1498                 (struct exynos4_clock *)samsung_get_base_clock();
1499         unsigned long sclk, aclk_100;
1500         unsigned int ratio;
1501
1502         sclk = get_pll_clk(APLL);
1503
1504         ratio = (readl(&clk->div_top)) >> 4;
1505         ratio &= 0xf;
1506         aclk_100 = sclk / (ratio + 1);
1507         return aclk_100;
1508 }
1509
1510 unsigned long get_pll_clk(int pllreg)
1511 {
1512         if (cpu_is_exynos5()) {
1513                 if (proid_is_exynos5420())
1514                         return exynos5420_get_pll_clk(pllreg);
1515                 return exynos5_get_pll_clk(pllreg);
1516         } else {
1517                 if (proid_is_exynos4412())
1518                         return exynos4x12_get_pll_clk(pllreg);
1519                 return exynos4_get_pll_clk(pllreg);
1520         }
1521 }
1522
1523 unsigned long get_arm_clk(void)
1524 {
1525         if (cpu_is_exynos5())
1526                 return exynos5_get_arm_clk();
1527         else {
1528                 if (proid_is_exynos4412())
1529                         return exynos4x12_get_arm_clk();
1530                 return exynos4_get_arm_clk();
1531         }
1532 }
1533
1534 unsigned long get_i2c_clk(void)
1535 {
1536         if (cpu_is_exynos5()) {
1537                 return exynos5_get_i2c_clk();
1538         } else if (cpu_is_exynos4()) {
1539                 return exynos4_get_i2c_clk();
1540         } else {
1541                 debug("I2C clock is not set for this CPU\n");
1542                 return 0;
1543         }
1544 }
1545
1546 unsigned long get_pwm_clk(void)
1547 {
1548         if (cpu_is_exynos5()) {
1549                 if (proid_is_exynos5420())
1550                         return exynos5420_get_pwm_clk();
1551                 return clock_get_periph_rate(PERIPH_ID_PWM0);
1552         } else {
1553                 if (proid_is_exynos4412())
1554                         return exynos4x12_get_pwm_clk();
1555                 return exynos4_get_pwm_clk();
1556         }
1557 }
1558
1559 unsigned long get_uart_clk(int dev_index)
1560 {
1561         if (cpu_is_exynos5()) {
1562                 if (proid_is_exynos5420())
1563                         return exynos5420_get_uart_clk(dev_index);
1564                 return exynos5_get_uart_clk(dev_index);
1565         } else {
1566                 if (proid_is_exynos4412())
1567                         return exynos4x12_get_uart_clk(dev_index);
1568                 return exynos4_get_uart_clk(dev_index);
1569         }
1570 }
1571
1572 unsigned long get_mmc_clk(int dev_index)
1573 {
1574         if (cpu_is_exynos5()) {
1575                 if (proid_is_exynos5420())
1576                         return exynos5420_get_mmc_clk(dev_index);
1577                 return exynos5_get_mmc_clk(dev_index);
1578         } else {
1579                 return exynos4_get_mmc_clk(dev_index);
1580         }
1581 }
1582
1583 void set_mmc_clk(int dev_index, unsigned int div)
1584 {
1585         if (cpu_is_exynos5()) {
1586                 if (proid_is_exynos5420())
1587                         exynos5420_set_mmc_clk(dev_index, div);
1588                 else
1589                         exynos5_set_mmc_clk(dev_index, div);
1590         } else {
1591                 exynos4_set_mmc_clk(dev_index, div);
1592         }
1593 }
1594
1595 unsigned long get_lcd_clk(void)
1596 {
1597         if (cpu_is_exynos4())
1598                 return exynos4_get_lcd_clk();
1599         else
1600                 return exynos5_get_lcd_clk();
1601 }
1602
1603 void set_lcd_clk(void)
1604 {
1605         if (cpu_is_exynos4())
1606                 exynos4_set_lcd_clk();
1607         else
1608                 exynos5_set_lcd_clk();
1609 }
1610
1611 void set_mipi_clk(void)
1612 {
1613         if (cpu_is_exynos4())
1614                 exynos4_set_mipi_clk();
1615 }
1616
1617 int set_spi_clk(int periph_id, unsigned int rate)
1618 {
1619         if (cpu_is_exynos5()) {
1620                 if (proid_is_exynos5420())
1621                         return exynos5420_set_spi_clk(periph_id, rate);
1622                 return exynos5_set_spi_clk(periph_id, rate);
1623         } else {
1624                 return 0;
1625         }
1626 }
1627
1628 int set_i2s_clk_prescaler(unsigned int src_frq, unsigned int dst_frq,
1629                           unsigned int i2s_id)
1630 {
1631         if (cpu_is_exynos5())
1632                 return exynos5_set_i2s_clk_prescaler(src_frq, dst_frq, i2s_id);
1633         else
1634                 return 0;
1635 }
1636
1637 int set_i2s_clk_source(unsigned int i2s_id)
1638 {
1639         if (cpu_is_exynos5())
1640                 return exynos5_set_i2s_clk_source(i2s_id);
1641         else
1642                 return 0;
1643 }
1644
1645 int set_epll_clk(unsigned long rate)
1646 {
1647         if (cpu_is_exynos5())
1648                 return exynos5_set_epll_clk(rate);
1649         else
1650                 return 0;
1651 }