1 /* 2 * Copyright (C) 2013 DENX Software Engineering 3 * 4 * Gerhard Sittig, <gsi@denx.de> 5 * 6 * common clock driver support for the MPC512x platform 7 * 8 * This is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 */ 13 14 #include <linux/bitops.h> 15 #include <linux/clk.h> 16 #include <linux/clk-provider.h> 17 #include <linux/clkdev.h> 18 #include <linux/device.h> 19 #include <linux/errno.h> 20 #include <linux/io.h> 21 #include <linux/of.h> 22 #include <linux/of_address.h> 23 24 #include <asm/mpc5121.h> 25 #include <dt-bindings/clock/mpc512x-clock.h> 26 27 #include "mpc512x.h" /* our public mpc5121_clk_init() API */ 28 29 /* helpers to keep the MCLK intermediates "somewhere" in our table */ 30 enum { 31 MCLK_IDX_MUX0, 32 MCLK_IDX_EN0, 33 MCLK_IDX_DIV0, 34 MCLK_MAX_IDX, 35 }; 36 37 #define NR_PSCS 12 38 #define NR_MSCANS 4 39 #define NR_SPDIFS 1 40 #define NR_OUTCLK 4 41 #define NR_MCLKS (NR_PSCS + NR_MSCANS + NR_SPDIFS + NR_OUTCLK) 42 43 /* extend the public set of clocks by adding internal slots for management */ 44 enum { 45 /* arrange for adjacent numbers after the public set */ 46 MPC512x_CLK_START_PRIVATE = MPC512x_CLK_LAST_PUBLIC, 47 /* clocks which aren't announced to the public */ 48 MPC512x_CLK_DDR, 49 MPC512x_CLK_MEM, 50 MPC512x_CLK_IIM, 51 /* intermediates in div+gate combos or fractional dividers */ 52 MPC512x_CLK_DDR_UG, 53 MPC512x_CLK_SDHC_x4, 54 MPC512x_CLK_SDHC_UG, 55 MPC512x_CLK_SDHC2_UG, 56 MPC512x_CLK_DIU_x4, 57 MPC512x_CLK_DIU_UG, 58 MPC512x_CLK_MBX_BUS_UG, 59 MPC512x_CLK_MBX_UG, 60 MPC512x_CLK_MBX_3D_UG, 61 MPC512x_CLK_PCI_UG, 62 MPC512x_CLK_NFC_UG, 63 MPC512x_CLK_LPC_UG, 64 MPC512x_CLK_SPDIF_TX_IN, 65 /* intermediates for the mux+gate+div+mux MCLK generation */ 66 MPC512x_CLK_MCLKS_FIRST, 67 MPC512x_CLK_MCLKS_LAST = MPC512x_CLK_MCLKS_FIRST 68 + NR_MCLKS * MCLK_MAX_IDX, 69 /* internal, symbolic spec for the number of slots */ 70 MPC512x_CLK_LAST_PRIVATE, 71 }; 72 73 /* data required for the OF clock provider registration */ 74 static struct clk *clks[MPC512x_CLK_LAST_PRIVATE]; 75 static struct clk_onecell_data clk_data; 76 77 /* CCM register access */ 78 static struct mpc512x_ccm __iomem *clkregs; 79 static DEFINE_SPINLOCK(clklock); 80 81 /* SoC variants {{{ */ 82 83 /* 84 * tell SoC variants apart as they are rather similar yet not identical, 85 * cache the result in an enum to not repeatedly run the expensive OF test 86 * 87 * MPC5123 is an MPC5121 without the MBX graphics accelerator 88 * 89 * MPC5125 has many more differences: no MBX, no AXE, no VIU, no SPDIF, 90 * no PATA, no SATA, no PCI, two FECs (of different compatibility name), 91 * only 10 PSCs (of different compatibility name), two SDHCs, different 92 * NFC IP block, output clocks, system PLL status query, different CPMF 93 * interpretation, no CFM, different fourth PSC/CAN mux0 input -- yet 94 * those differences can get folded into this clock provider support 95 * code and don't warrant a separate highly redundant implementation 96 */ 97 98 static enum soc_type { 99 MPC512x_SOC_MPC5121, 100 MPC512x_SOC_MPC5123, 101 MPC512x_SOC_MPC5125, 102 } soc; 103 104 static void mpc512x_clk_determine_soc(void) 105 { 106 if (of_machine_is_compatible("fsl,mpc5121")) { 107 soc = MPC512x_SOC_MPC5121; 108 return; 109 } 110 if (of_machine_is_compatible("fsl,mpc5123")) { 111 soc = MPC512x_SOC_MPC5123; 112 return; 113 } 114 if (of_machine_is_compatible("fsl,mpc5125")) { 115 soc = MPC512x_SOC_MPC5125; 116 return; 117 } 118 } 119 120 static bool soc_has_mbx(void) 121 { 122 if (soc == MPC512x_SOC_MPC5121) 123 return true; 124 return false; 125 } 126 127 static bool soc_has_axe(void) 128 { 129 if (soc == MPC512x_SOC_MPC5125) 130 return false; 131 return true; 132 } 133 134 static bool soc_has_viu(void) 135 { 136 if (soc == MPC512x_SOC_MPC5125) 137 return false; 138 return true; 139 } 140 141 static bool soc_has_spdif(void) 142 { 143 if (soc == MPC512x_SOC_MPC5125) 144 return false; 145 return true; 146 } 147 148 static bool soc_has_pata(void) 149 { 150 if (soc == MPC512x_SOC_MPC5125) 151 return false; 152 return true; 153 } 154 155 static bool soc_has_sata(void) 156 { 157 if (soc == MPC512x_SOC_MPC5125) 158 return false; 159 return true; 160 } 161 162 static bool soc_has_pci(void) 163 { 164 if (soc == MPC512x_SOC_MPC5125) 165 return false; 166 return true; 167 } 168 169 static bool soc_has_fec2(void) 170 { 171 if (soc == MPC512x_SOC_MPC5125) 172 return true; 173 return false; 174 } 175 176 static int soc_max_pscnum(void) 177 { 178 if (soc == MPC512x_SOC_MPC5125) 179 return 10; 180 return 12; 181 } 182 183 static bool soc_has_sdhc2(void) 184 { 185 if (soc == MPC512x_SOC_MPC5125) 186 return true; 187 return false; 188 } 189 190 static bool soc_has_nfc_5125(void) 191 { 192 if (soc == MPC512x_SOC_MPC5125) 193 return true; 194 return false; 195 } 196 197 static bool soc_has_outclk(void) 198 { 199 if (soc == MPC512x_SOC_MPC5125) 200 return true; 201 return false; 202 } 203 204 static bool soc_has_cpmf_0_bypass(void) 205 { 206 if (soc == MPC512x_SOC_MPC5125) 207 return true; 208 return false; 209 } 210 211 static bool soc_has_mclk_mux0_canin(void) 212 { 213 if (soc == MPC512x_SOC_MPC5125) 214 return true; 215 return false; 216 } 217 218 /* }}} SoC variants */ 219 /* common clk API wrappers {{{ */ 220 221 /* convenience wrappers around the common clk API */ 222 static inline struct clk *mpc512x_clk_fixed(const char *name, int rate) 223 { 224 return clk_register_fixed_rate(NULL, name, NULL, 0, rate); 225 } 226 227 static inline struct clk *mpc512x_clk_factor( 228 const char *name, const char *parent_name, 229 int mul, int div) 230 { 231 int clkflags; 232 233 clkflags = CLK_SET_RATE_PARENT; 234 return clk_register_fixed_factor(NULL, name, parent_name, clkflags, 235 mul, div); 236 } 237 238 static inline struct clk *mpc512x_clk_divider( 239 const char *name, const char *parent_name, u8 clkflags, 240 u32 __iomem *reg, u8 pos, u8 len, int divflags) 241 { 242 return clk_register_divider(NULL, name, parent_name, clkflags, 243 reg, pos, len, divflags, &clklock); 244 } 245 246 static inline struct clk *mpc512x_clk_divtable( 247 const char *name, const char *parent_name, 248 u32 __iomem *reg, u8 pos, u8 len, 249 const struct clk_div_table *divtab) 250 { 251 u8 divflags; 252 253 divflags = 0; 254 return clk_register_divider_table(NULL, name, parent_name, 0, 255 reg, pos, len, divflags, 256 divtab, &clklock); 257 } 258 259 static inline struct clk *mpc512x_clk_gated( 260 const char *name, const char *parent_name, 261 u32 __iomem *reg, u8 pos) 262 { 263 int clkflags; 264 265 clkflags = CLK_SET_RATE_PARENT; 266 return clk_register_gate(NULL, name, parent_name, clkflags, 267 reg, pos, 0, &clklock); 268 } 269 270 static inline struct clk *mpc512x_clk_muxed(const char *name, 271 const char **parent_names, int parent_count, 272 u32 __iomem *reg, u8 pos, u8 len) 273 { 274 int clkflags; 275 u8 muxflags; 276 277 clkflags = CLK_SET_RATE_PARENT; 278 muxflags = 0; 279 return clk_register_mux(NULL, name, 280 parent_names, parent_count, clkflags, 281 reg, pos, len, muxflags, &clklock); 282 } 283 284 /* }}} common clk API wrappers */ 285 286 /* helper to isolate a bit field from a register */ 287 static inline int get_bit_field(uint32_t __iomem *reg, uint8_t pos, uint8_t len) 288 { 289 uint32_t val; 290 291 val = in_be32(reg); 292 val >>= pos; 293 val &= (1 << len) - 1; 294 return val; 295 } 296 297 /* get the SPMF and translate it into the "sys pll" multiplier */ 298 static int get_spmf_mult(void) 299 { 300 static int spmf_to_mult[] = { 301 68, 1, 12, 16, 20, 24, 28, 32, 302 36, 40, 44, 48, 52, 56, 60, 64, 303 }; 304 int spmf; 305 306 spmf = get_bit_field(&clkregs->spmr, 24, 4); 307 return spmf_to_mult[spmf]; 308 } 309 310 /* 311 * get the SYS_DIV value and translate it into a divide factor 312 * 313 * values returned from here are a multiple of the real factor since the 314 * divide ratio is fractional 315 */ 316 static int get_sys_div_x2(void) 317 { 318 static int sysdiv_code_to_x2[] = { 319 4, 5, 6, 7, 8, 9, 10, 14, 320 12, 16, 18, 22, 20, 24, 26, 30, 321 28, 32, 34, 38, 36, 40, 42, 46, 322 44, 48, 50, 54, 52, 56, 58, 62, 323 60, 64, 66, 324 }; 325 int divcode; 326 327 divcode = get_bit_field(&clkregs->scfr2, 26, 6); 328 return sysdiv_code_to_x2[divcode]; 329 } 330 331 /* 332 * get the CPMF value and translate it into a multiplier factor 333 * 334 * values returned from here are a multiple of the real factor since the 335 * multiplier ratio is fractional 336 */ 337 static int get_cpmf_mult_x2(void) 338 { 339 static int cpmf_to_mult_x36[] = { 340 /* 0b000 is "times 36" */ 341 72, 2, 2, 3, 4, 5, 6, 7, 342 }; 343 static int cpmf_to_mult_0by[] = { 344 /* 0b000 is "bypass" */ 345 2, 2, 2, 3, 4, 5, 6, 7, 346 }; 347 348 int *cpmf_to_mult; 349 int cpmf; 350 351 cpmf = get_bit_field(&clkregs->spmr, 16, 4); 352 if (soc_has_cpmf_0_bypass()) 353 cpmf_to_mult = cpmf_to_mult_0by; 354 else 355 cpmf_to_mult = cpmf_to_mult_x36; 356 return cpmf_to_mult[cpmf]; 357 } 358 359 /* 360 * some of the clock dividers do scale in a linear way, yet not all of 361 * their bit combinations are legal; use a divider table to get a 362 * resulting set of applicable divider values 363 */ 364 365 /* applies to the IPS_DIV, and PCI_DIV values */ 366 static struct clk_div_table divtab_2346[] = { 367 { .val = 2, .div = 2, }, 368 { .val = 3, .div = 3, }, 369 { .val = 4, .div = 4, }, 370 { .val = 6, .div = 6, }, 371 { .div = 0, }, 372 }; 373 374 /* applies to the MBX_DIV, LPC_DIV, and NFC_DIV values */ 375 static struct clk_div_table divtab_1234[] = { 376 { .val = 1, .div = 1, }, 377 { .val = 2, .div = 2, }, 378 { .val = 3, .div = 3, }, 379 { .val = 4, .div = 4, }, 380 { .div = 0, }, 381 }; 382 383 static int get_freq_from_dt(char *propname) 384 { 385 struct device_node *np; 386 const unsigned int *prop; 387 int val; 388 389 val = 0; 390 np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-immr"); 391 if (np) { 392 prop = of_get_property(np, propname, NULL); 393 if (prop) 394 val = *prop; 395 of_node_put(np); 396 } 397 return val; 398 } 399 400 static void mpc512x_clk_preset_data(void) 401 { 402 size_t i; 403 404 for (i = 0; i < ARRAY_SIZE(clks); i++) 405 clks[i] = ERR_PTR(-ENODEV); 406 } 407 408 /* 409 * - receives the "bus frequency" from the caller (that's the IPS clock 410 * rate, the historical source of clock information) 411 * - fetches the system PLL multiplier and divider values as well as the 412 * IPS divider value from hardware 413 * - determines the REF clock rate either from the XTAL/OSC spec (if 414 * there is a device tree node describing the oscillator) or from the 415 * IPS bus clock (supported for backwards compatibility, such that 416 * setups without XTAL/OSC specs keep working) 417 * - creates the "ref" clock item in the clock tree, such that 418 * subsequent code can create the remainder of the hierarchy (REF -> 419 * SYS -> CSB -> IPS) from the REF clock rate and the returned mul/div 420 * values 421 */ 422 static void mpc512x_clk_setup_ref_clock(struct device_node *np, int bus_freq, 423 int *sys_mul, int *sys_div, 424 int *ips_div) 425 { 426 struct clk *osc_clk; 427 int calc_freq; 428 429 /* fetch mul/div factors from the hardware */ 430 *sys_mul = get_spmf_mult(); 431 *sys_mul *= 2; /* compensate for the fractional divider */ 432 *sys_div = get_sys_div_x2(); 433 *ips_div = get_bit_field(&clkregs->scfr1, 23, 3); 434 435 /* lookup the oscillator clock for its rate */ 436 osc_clk = of_clk_get_by_name(np, "osc"); 437 438 /* 439 * either descend from OSC to REF (and in bypassing verify the 440 * IPS rate), or backtrack from IPS and multiplier values that 441 * were fetched from hardware to REF and thus to the OSC value 442 * 443 * in either case the REF clock gets created here and the 444 * remainder of the clock tree can get spanned from there 445 */ 446 if (!IS_ERR(osc_clk)) { 447 clks[MPC512x_CLK_REF] = mpc512x_clk_factor("ref", "osc", 1, 1); 448 calc_freq = clk_get_rate(clks[MPC512x_CLK_REF]); 449 calc_freq *= *sys_mul; 450 calc_freq /= *sys_div; 451 calc_freq /= 2; 452 calc_freq /= *ips_div; 453 if (bus_freq && calc_freq != bus_freq) 454 pr_warn("calc rate %d != OF spec %d\n", 455 calc_freq, bus_freq); 456 } else { 457 calc_freq = bus_freq; /* start with IPS */ 458 calc_freq *= *ips_div; /* IPS -> CSB */ 459 calc_freq *= 2; /* CSB -> SYS */ 460 calc_freq *= *sys_div; /* SYS -> PLL out */ 461 calc_freq /= *sys_mul; /* PLL out -> REF == OSC */ 462 clks[MPC512x_CLK_REF] = mpc512x_clk_fixed("ref", calc_freq); 463 } 464 } 465 466 /* MCLK helpers {{{ */ 467 468 /* 469 * helper code for the MCLK subtree setup 470 * 471 * the overview in section 5.2.4 of the MPC5121e Reference Manual rev4 472 * suggests that all instances of the "PSC clock generation" are equal, 473 * and that one might re-use the PSC setup for MSCAN clock generation 474 * (section 5.2.5) as well, at least the logic if not the data for 475 * description 476 * 477 * the details (starting at page 5-20) show differences in the specific 478 * inputs of the first mux stage ("can clk in", "spdif tx"), and the 479 * factual non-availability of the second mux stage (it's present yet 480 * only one input is valid) 481 * 482 * the MSCAN clock related registers (starting at page 5-35) all 483 * reference "spdif clk" at the first mux stage and don't mention any 484 * "can clk" at all, which somehow is unexpected 485 * 486 * TODO re-check the document, and clarify whether the RM is correct in 487 * the overview or in the details, and whether the difference is a 488 * clipboard induced error or results from chip revisions 489 * 490 * it turns out that the RM rev4 as of 2012-06 talks about "can" for the 491 * PSCs while RM rev3 as of 2008-10 talks about "spdif", so I guess that 492 * first a doc update is required which better reflects reality in the 493 * SoC before the implementation should follow while no questions remain 494 */ 495 496 /* 497 * note that this declaration raises a checkpatch warning, but 498 * it's the very data type dictated by <linux/clk-provider.h>, 499 * "fixing" this warning will break compilation 500 */ 501 static const char *parent_names_mux0_spdif[] = { 502 "sys", "ref", "psc-mclk-in", "spdif-tx", 503 }; 504 505 static const char *parent_names_mux0_canin[] = { 506 "sys", "ref", "psc-mclk-in", "can-clk-in", 507 }; 508 509 enum mclk_type { 510 MCLK_TYPE_PSC, 511 MCLK_TYPE_MSCAN, 512 MCLK_TYPE_SPDIF, 513 MCLK_TYPE_OUTCLK, 514 }; 515 516 struct mclk_setup_data { 517 enum mclk_type type; 518 bool has_mclk1; 519 const char *name_mux0; 520 const char *name_en0; 521 const char *name_div0; 522 const char *parent_names_mux1[2]; 523 const char *name_mclk; 524 }; 525 526 #define MCLK_SETUP_DATA_PSC(id) { \ 527 MCLK_TYPE_PSC, 0, \ 528 "psc" #id "-mux0", \ 529 "psc" #id "-en0", \ 530 "psc" #id "_mclk_div", \ 531 { "psc" #id "_mclk_div", "dummy", }, \ 532 "psc" #id "_mclk", \ 533 } 534 535 #define MCLK_SETUP_DATA_MSCAN(id) { \ 536 MCLK_TYPE_MSCAN, 0, \ 537 "mscan" #id "-mux0", \ 538 "mscan" #id "-en0", \ 539 "mscan" #id "_mclk_div", \ 540 { "mscan" #id "_mclk_div", "dummy", }, \ 541 "mscan" #id "_mclk", \ 542 } 543 544 #define MCLK_SETUP_DATA_SPDIF { \ 545 MCLK_TYPE_SPDIF, 1, \ 546 "spdif-mux0", \ 547 "spdif-en0", \ 548 "spdif_mclk_div", \ 549 { "spdif_mclk_div", "spdif-rx", }, \ 550 "spdif_mclk", \ 551 } 552 553 #define MCLK_SETUP_DATA_OUTCLK(id) { \ 554 MCLK_TYPE_OUTCLK, 0, \ 555 "out" #id "-mux0", \ 556 "out" #id "-en0", \ 557 "out" #id "_mclk_div", \ 558 { "out" #id "_mclk_div", "dummy", }, \ 559 "out" #id "_clk", \ 560 } 561 562 static struct mclk_setup_data mclk_psc_data[] = { 563 MCLK_SETUP_DATA_PSC(0), 564 MCLK_SETUP_DATA_PSC(1), 565 MCLK_SETUP_DATA_PSC(2), 566 MCLK_SETUP_DATA_PSC(3), 567 MCLK_SETUP_DATA_PSC(4), 568 MCLK_SETUP_DATA_PSC(5), 569 MCLK_SETUP_DATA_PSC(6), 570 MCLK_SETUP_DATA_PSC(7), 571 MCLK_SETUP_DATA_PSC(8), 572 MCLK_SETUP_DATA_PSC(9), 573 MCLK_SETUP_DATA_PSC(10), 574 MCLK_SETUP_DATA_PSC(11), 575 }; 576 577 static struct mclk_setup_data mclk_mscan_data[] = { 578 MCLK_SETUP_DATA_MSCAN(0), 579 MCLK_SETUP_DATA_MSCAN(1), 580 MCLK_SETUP_DATA_MSCAN(2), 581 MCLK_SETUP_DATA_MSCAN(3), 582 }; 583 584 static struct mclk_setup_data mclk_spdif_data[] = { 585 MCLK_SETUP_DATA_SPDIF, 586 }; 587 588 static struct mclk_setup_data mclk_outclk_data[] = { 589 MCLK_SETUP_DATA_OUTCLK(0), 590 MCLK_SETUP_DATA_OUTCLK(1), 591 MCLK_SETUP_DATA_OUTCLK(2), 592 MCLK_SETUP_DATA_OUTCLK(3), 593 }; 594 595 /* setup the MCLK clock subtree of an individual PSC/MSCAN/SPDIF */ 596 static void mpc512x_clk_setup_mclk(struct mclk_setup_data *entry, size_t idx) 597 { 598 size_t clks_idx_pub, clks_idx_int; 599 u32 __iomem *mccr_reg; /* MCLK control register (mux, en, div) */ 600 int div; 601 602 /* derive a few parameters from the component type and index */ 603 switch (entry->type) { 604 case MCLK_TYPE_PSC: 605 clks_idx_pub = MPC512x_CLK_PSC0_MCLK + idx; 606 clks_idx_int = MPC512x_CLK_MCLKS_FIRST 607 + (idx) * MCLK_MAX_IDX; 608 mccr_reg = &clkregs->psc_ccr[idx]; 609 break; 610 case MCLK_TYPE_MSCAN: 611 clks_idx_pub = MPC512x_CLK_MSCAN0_MCLK + idx; 612 clks_idx_int = MPC512x_CLK_MCLKS_FIRST 613 + (NR_PSCS + idx) * MCLK_MAX_IDX; 614 mccr_reg = &clkregs->mscan_ccr[idx]; 615 break; 616 case MCLK_TYPE_SPDIF: 617 clks_idx_pub = MPC512x_CLK_SPDIF_MCLK; 618 clks_idx_int = MPC512x_CLK_MCLKS_FIRST 619 + (NR_PSCS + NR_MSCANS) * MCLK_MAX_IDX; 620 mccr_reg = &clkregs->spccr; 621 break; 622 case MCLK_TYPE_OUTCLK: 623 clks_idx_pub = MPC512x_CLK_OUT0_CLK + idx; 624 clks_idx_int = MPC512x_CLK_MCLKS_FIRST 625 + (NR_PSCS + NR_MSCANS + NR_SPDIFS + idx) 626 * MCLK_MAX_IDX; 627 mccr_reg = &clkregs->out_ccr[idx]; 628 break; 629 default: 630 return; 631 } 632 633 /* 634 * this was grabbed from the PPC_CLOCK implementation, which 635 * enforced a specific MCLK divider while the clock was gated 636 * during setup (that's a documented hardware requirement) 637 * 638 * the PPC_CLOCK implementation might even have violated the 639 * "MCLK <= IPS" constraint, the fixed divider value of 1 640 * results in a divider of 2 and thus MCLK = SYS/2 which equals 641 * CSB which is greater than IPS; the serial port setup may have 642 * adjusted the divider which the clock setup might have left in 643 * an undesirable state 644 * 645 * initial setup is: 646 * - MCLK 0 from SYS 647 * - MCLK DIV such to not exceed the IPS clock 648 * - MCLK 0 enabled 649 * - MCLK 1 from MCLK DIV 650 */ 651 div = clk_get_rate(clks[MPC512x_CLK_SYS]); 652 div /= clk_get_rate(clks[MPC512x_CLK_IPS]); 653 out_be32(mccr_reg, (0 << 16)); 654 out_be32(mccr_reg, (0 << 16) | ((div - 1) << 17)); 655 out_be32(mccr_reg, (1 << 16) | ((div - 1) << 17)); 656 657 /* 658 * create the 'struct clk' items of the MCLK's clock subtree 659 * 660 * note that by design we always create all nodes and won't take 661 * shortcuts here, because 662 * - the "internal" MCLK_DIV and MCLK_OUT signal in turn are 663 * selectable inputs to the CFM while those who "actually use" 664 * the PSC/MSCAN/SPDIF (serial drivers et al) need the MCLK 665 * for their bitrate 666 * - in the absence of "aliases" for clocks we need to create 667 * individial 'struct clk' items for whatever might get 668 * referenced or looked up, even if several of those items are 669 * identical from the logical POV (their rate value) 670 * - for easier future maintenance and for better reflection of 671 * the SoC's documentation, it appears appropriate to generate 672 * clock items even for those muxers which actually are NOPs 673 * (those with two inputs of which one is reserved) 674 */ 675 clks[clks_idx_int + MCLK_IDX_MUX0] = mpc512x_clk_muxed( 676 entry->name_mux0, 677 soc_has_mclk_mux0_canin() 678 ? &parent_names_mux0_canin[0] 679 : &parent_names_mux0_spdif[0], 680 ARRAY_SIZE(parent_names_mux0_spdif), 681 mccr_reg, 14, 2); 682 clks[clks_idx_int + MCLK_IDX_EN0] = mpc512x_clk_gated( 683 entry->name_en0, entry->name_mux0, 684 mccr_reg, 16); 685 clks[clks_idx_int + MCLK_IDX_DIV0] = mpc512x_clk_divider( 686 entry->name_div0, 687 entry->name_en0, CLK_SET_RATE_GATE, 688 mccr_reg, 17, 15, 0); 689 if (entry->has_mclk1) { 690 clks[clks_idx_pub] = mpc512x_clk_muxed( 691 entry->name_mclk, 692 &entry->parent_names_mux1[0], 693 ARRAY_SIZE(entry->parent_names_mux1), 694 mccr_reg, 7, 1); 695 } else { 696 clks[clks_idx_pub] = mpc512x_clk_factor( 697 entry->name_mclk, 698 entry->parent_names_mux1[0], 699 1, 1); 700 } 701 } 702 703 /* }}} MCLK helpers */ 704 705 static void mpc512x_clk_setup_clock_tree(struct device_node *np, int busfreq) 706 { 707 int sys_mul, sys_div, ips_div; 708 int mul, div; 709 size_t mclk_idx; 710 int freq; 711 712 /* 713 * developer's notes: 714 * - consider whether to handle clocks which have both gates and 715 * dividers via intermediates or by means of composites 716 * - fractional dividers appear to not map well to composites 717 * since they can be seen as a fixed multiplier and an 718 * adjustable divider, while composites can only combine at 719 * most one of a mux, div, and gate each into one 'struct clk' 720 * item 721 * - PSC/MSCAN/SPDIF clock generation OTOH already is very 722 * specific and cannot get mapped to componsites (at least not 723 * a single one, maybe two of them, but then some of these 724 * intermediate clock signals get referenced elsewhere (e.g. 725 * in the clock frequency measurement, CFM) and thus need 726 * publicly available names 727 * - the current source layout appropriately reflects the 728 * hardware setup, and it works, so it's questionable whether 729 * further changes will result in big enough a benefit 730 */ 731 732 /* regardless of whether XTAL/OSC exists, have REF created */ 733 mpc512x_clk_setup_ref_clock(np, busfreq, &sys_mul, &sys_div, &ips_div); 734 735 /* now setup the REF -> SYS -> CSB -> IPS hierarchy */ 736 clks[MPC512x_CLK_SYS] = mpc512x_clk_factor("sys", "ref", 737 sys_mul, sys_div); 738 clks[MPC512x_CLK_CSB] = mpc512x_clk_factor("csb", "sys", 1, 2); 739 clks[MPC512x_CLK_IPS] = mpc512x_clk_divtable("ips", "csb", 740 &clkregs->scfr1, 23, 3, 741 divtab_2346); 742 /* now setup anything below SYS and CSB and IPS */ 743 744 clks[MPC512x_CLK_DDR_UG] = mpc512x_clk_factor("ddr-ug", "sys", 1, 2); 745 746 /* 747 * the Reference Manual discusses that for SDHC only even divide 748 * ratios are supported because clock domain synchronization 749 * between 'per' and 'ipg' is broken; 750 * keep the divider's bit 0 cleared (per reset value), and only 751 * allow to setup the divider's bits 7:1, which results in that 752 * only even divide ratios can get configured upon rate changes; 753 * keep the "x4" name because this bit shift hack is an internal 754 * implementation detail, the "fractional divider with quarters" 755 * semantics remains 756 */ 757 clks[MPC512x_CLK_SDHC_x4] = mpc512x_clk_factor("sdhc-x4", "csb", 2, 1); 758 clks[MPC512x_CLK_SDHC_UG] = mpc512x_clk_divider("sdhc-ug", "sdhc-x4", 0, 759 &clkregs->scfr2, 1, 7, 760 CLK_DIVIDER_ONE_BASED); 761 if (soc_has_sdhc2()) { 762 clks[MPC512x_CLK_SDHC2_UG] = mpc512x_clk_divider( 763 "sdhc2-ug", "sdhc-x4", 0, &clkregs->scfr2, 764 9, 7, CLK_DIVIDER_ONE_BASED); 765 } 766 767 clks[MPC512x_CLK_DIU_x4] = mpc512x_clk_factor("diu-x4", "csb", 4, 1); 768 clks[MPC512x_CLK_DIU_UG] = mpc512x_clk_divider("diu-ug", "diu-x4", 0, 769 &clkregs->scfr1, 0, 8, 770 CLK_DIVIDER_ONE_BASED); 771 772 /* 773 * the "power architecture PLL" was setup from data which was 774 * sampled from the reset config word, at this point in time the 775 * configuration can be considered fixed and read only (i.e. no 776 * longer adjustable, or no longer in need of adjustment), which 777 * is why we don't register a PLL here but assume fixed factors 778 */ 779 mul = get_cpmf_mult_x2(); 780 div = 2; /* compensate for the fractional factor */ 781 clks[MPC512x_CLK_E300] = mpc512x_clk_factor("e300", "csb", mul, div); 782 783 if (soc_has_mbx()) { 784 clks[MPC512x_CLK_MBX_BUS_UG] = mpc512x_clk_factor( 785 "mbx-bus-ug", "csb", 1, 2); 786 clks[MPC512x_CLK_MBX_UG] = mpc512x_clk_divtable( 787 "mbx-ug", "mbx-bus-ug", &clkregs->scfr1, 788 14, 3, divtab_1234); 789 clks[MPC512x_CLK_MBX_3D_UG] = mpc512x_clk_factor( 790 "mbx-3d-ug", "mbx-ug", 1, 1); 791 } 792 if (soc_has_pci()) { 793 clks[MPC512x_CLK_PCI_UG] = mpc512x_clk_divtable( 794 "pci-ug", "csb", &clkregs->scfr1, 795 20, 3, divtab_2346); 796 } 797 if (soc_has_nfc_5125()) { 798 /* 799 * XXX TODO implement 5125 NFC clock setup logic, 800 * with high/low period counters in clkregs->scfr3, 801 * currently there are no users so it's ENOIMPL 802 */ 803 clks[MPC512x_CLK_NFC_UG] = ERR_PTR(-ENOTSUPP); 804 } else { 805 clks[MPC512x_CLK_NFC_UG] = mpc512x_clk_divtable( 806 "nfc-ug", "ips", &clkregs->scfr1, 807 8, 3, divtab_1234); 808 } 809 clks[MPC512x_CLK_LPC_UG] = mpc512x_clk_divtable("lpc-ug", "ips", 810 &clkregs->scfr1, 11, 3, 811 divtab_1234); 812 813 clks[MPC512x_CLK_LPC] = mpc512x_clk_gated("lpc", "lpc-ug", 814 &clkregs->sccr1, 30); 815 clks[MPC512x_CLK_NFC] = mpc512x_clk_gated("nfc", "nfc-ug", 816 &clkregs->sccr1, 29); 817 if (soc_has_pata()) { 818 clks[MPC512x_CLK_PATA] = mpc512x_clk_gated( 819 "pata", "ips", &clkregs->sccr1, 28); 820 } 821 /* for PSCs there is a "registers" gate and a bitrate MCLK subtree */ 822 for (mclk_idx = 0; mclk_idx < soc_max_pscnum(); mclk_idx++) { 823 char name[12]; 824 snprintf(name, sizeof(name), "psc%d", mclk_idx); 825 clks[MPC512x_CLK_PSC0 + mclk_idx] = mpc512x_clk_gated( 826 name, "ips", &clkregs->sccr1, 27 - mclk_idx); 827 mpc512x_clk_setup_mclk(&mclk_psc_data[mclk_idx], mclk_idx); 828 } 829 clks[MPC512x_CLK_PSC_FIFO] = mpc512x_clk_gated("psc-fifo", "ips", 830 &clkregs->sccr1, 15); 831 if (soc_has_sata()) { 832 clks[MPC512x_CLK_SATA] = mpc512x_clk_gated( 833 "sata", "ips", &clkregs->sccr1, 14); 834 } 835 clks[MPC512x_CLK_FEC] = mpc512x_clk_gated("fec", "ips", 836 &clkregs->sccr1, 13); 837 if (soc_has_pci()) { 838 clks[MPC512x_CLK_PCI] = mpc512x_clk_gated( 839 "pci", "pci-ug", &clkregs->sccr1, 11); 840 } 841 clks[MPC512x_CLK_DDR] = mpc512x_clk_gated("ddr", "ddr-ug", 842 &clkregs->sccr1, 10); 843 if (soc_has_fec2()) { 844 clks[MPC512x_CLK_FEC2] = mpc512x_clk_gated( 845 "fec2", "ips", &clkregs->sccr1, 9); 846 } 847 848 clks[MPC512x_CLK_DIU] = mpc512x_clk_gated("diu", "diu-ug", 849 &clkregs->sccr2, 31); 850 if (soc_has_axe()) { 851 clks[MPC512x_CLK_AXE] = mpc512x_clk_gated( 852 "axe", "csb", &clkregs->sccr2, 30); 853 } 854 clks[MPC512x_CLK_MEM] = mpc512x_clk_gated("mem", "ips", 855 &clkregs->sccr2, 29); 856 clks[MPC512x_CLK_USB1] = mpc512x_clk_gated("usb1", "csb", 857 &clkregs->sccr2, 28); 858 clks[MPC512x_CLK_USB2] = mpc512x_clk_gated("usb2", "csb", 859 &clkregs->sccr2, 27); 860 clks[MPC512x_CLK_I2C] = mpc512x_clk_gated("i2c", "ips", 861 &clkregs->sccr2, 26); 862 /* MSCAN differs from PSC with just one gate for multiple components */ 863 clks[MPC512x_CLK_BDLC] = mpc512x_clk_gated("bdlc", "ips", 864 &clkregs->sccr2, 25); 865 for (mclk_idx = 0; mclk_idx < ARRAY_SIZE(mclk_mscan_data); mclk_idx++) 866 mpc512x_clk_setup_mclk(&mclk_mscan_data[mclk_idx], mclk_idx); 867 clks[MPC512x_CLK_SDHC] = mpc512x_clk_gated("sdhc", "sdhc-ug", 868 &clkregs->sccr2, 24); 869 /* there is only one SPDIF component, which shares MCLK support code */ 870 if (soc_has_spdif()) { 871 clks[MPC512x_CLK_SPDIF] = mpc512x_clk_gated( 872 "spdif", "ips", &clkregs->sccr2, 23); 873 mpc512x_clk_setup_mclk(&mclk_spdif_data[0], 0); 874 } 875 if (soc_has_mbx()) { 876 clks[MPC512x_CLK_MBX_BUS] = mpc512x_clk_gated( 877 "mbx-bus", "mbx-bus-ug", &clkregs->sccr2, 22); 878 clks[MPC512x_CLK_MBX] = mpc512x_clk_gated( 879 "mbx", "mbx-ug", &clkregs->sccr2, 21); 880 clks[MPC512x_CLK_MBX_3D] = mpc512x_clk_gated( 881 "mbx-3d", "mbx-3d-ug", &clkregs->sccr2, 20); 882 } 883 clks[MPC512x_CLK_IIM] = mpc512x_clk_gated("iim", "csb", 884 &clkregs->sccr2, 19); 885 if (soc_has_viu()) { 886 clks[MPC512x_CLK_VIU] = mpc512x_clk_gated( 887 "viu", "csb", &clkregs->sccr2, 18); 888 } 889 if (soc_has_sdhc2()) { 890 clks[MPC512x_CLK_SDHC2] = mpc512x_clk_gated( 891 "sdhc-2", "sdhc2-ug", &clkregs->sccr2, 17); 892 } 893 894 if (soc_has_outclk()) { 895 size_t idx; /* used as mclk_idx, just to trim line length */ 896 for (idx = 0; idx < ARRAY_SIZE(mclk_outclk_data); idx++) 897 mpc512x_clk_setup_mclk(&mclk_outclk_data[idx], idx); 898 } 899 900 /* 901 * externally provided clocks (when implemented in hardware, 902 * device tree may specify values which otherwise were unknown) 903 */ 904 freq = get_freq_from_dt("psc_mclk_in"); 905 if (!freq) 906 freq = 25000000; 907 clks[MPC512x_CLK_PSC_MCLK_IN] = mpc512x_clk_fixed("psc_mclk_in", freq); 908 if (soc_has_mclk_mux0_canin()) { 909 freq = get_freq_from_dt("can_clk_in"); 910 clks[MPC512x_CLK_CAN_CLK_IN] = mpc512x_clk_fixed( 911 "can_clk_in", freq); 912 } else { 913 freq = get_freq_from_dt("spdif_tx_in"); 914 clks[MPC512x_CLK_SPDIF_TX_IN] = mpc512x_clk_fixed( 915 "spdif_tx_in", freq); 916 freq = get_freq_from_dt("spdif_rx_in"); 917 clks[MPC512x_CLK_SPDIF_TX_IN] = mpc512x_clk_fixed( 918 "spdif_rx_in", freq); 919 } 920 921 /* fixed frequency for AC97, always 24.567MHz */ 922 clks[MPC512x_CLK_AC97] = mpc512x_clk_fixed("ac97", 24567000); 923 924 /* 925 * pre-enable those "internal" clock items which never get 926 * claimed by any peripheral driver, to not have the clock 927 * subsystem disable them late at startup 928 */ 929 clk_prepare_enable(clks[MPC512x_CLK_DUMMY]); 930 clk_prepare_enable(clks[MPC512x_CLK_E300]); /* PowerPC CPU */ 931 clk_prepare_enable(clks[MPC512x_CLK_DDR]); /* DRAM */ 932 clk_prepare_enable(clks[MPC512x_CLK_MEM]); /* SRAM */ 933 clk_prepare_enable(clks[MPC512x_CLK_IPS]); /* SoC periph */ 934 clk_prepare_enable(clks[MPC512x_CLK_LPC]); /* boot media */ 935 } 936 937 /* 938 * registers the set of public clocks (those listed in the dt-bindings/ 939 * header file) for OF lookups, keeps the intermediates private to us 940 */ 941 static void mpc5121_clk_register_of_provider(struct device_node *np) 942 { 943 clk_data.clks = clks; 944 clk_data.clk_num = MPC512x_CLK_LAST_PUBLIC + 1; /* _not_ ARRAY_SIZE() */ 945 of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data); 946 } 947 948 /* 949 * temporary support for the period of time between introduction of CCF 950 * support and the adjustment of peripheral drivers to OF based lookups 951 */ 952 static void mpc5121_clk_provide_migration_support(void) 953 { 954 955 /* 956 * pre-enable those clock items which are not yet appropriately 957 * acquired by their peripheral driver 958 * 959 * the PCI clock cannot get acquired by its peripheral driver, 960 * because for this platform the driver won't probe(), instead 961 * initialization is done from within the .setup_arch() routine 962 * at a point in time where the clock provider has not been 963 * setup yet and thus isn't available yet 964 * 965 * so we "pre-enable" the clock here, to not have the clock 966 * subsystem automatically disable this item in a late init call 967 * 968 * this PCI clock pre-enable workaround only applies when there 969 * are device tree nodes for PCI and thus the peripheral driver 970 * has attached to bridges, otherwise the PCI clock remains 971 * unused and so it gets disabled 972 */ 973 clk_prepare_enable(clks[MPC512x_CLK_PSC3_MCLK]);/* serial console */ 974 if (of_find_compatible_node(NULL, "pci", "fsl,mpc5121-pci")) 975 clk_prepare_enable(clks[MPC512x_CLK_PCI]); 976 } 977 978 /* 979 * those macros are not exactly pretty, but they encapsulate a lot 980 * of copy'n'paste heavy code which is even more ugly, and reduce 981 * the potential for inconsistencies in those many code copies 982 */ 983 #define FOR_NODES(compatname) \ 984 for_each_compatible_node(np, NULL, compatname) 985 986 #define NODE_PREP do { \ 987 of_address_to_resource(np, 0, &res); \ 988 snprintf(devname, sizeof(devname), "%08x.%s", res.start, np->name); \ 989 } while (0) 990 991 #define NODE_CHK(clkname, clkitem, regnode, regflag) do { \ 992 struct clk *clk; \ 993 clk = of_clk_get_by_name(np, clkname); \ 994 if (IS_ERR(clk)) { \ 995 clk = clkitem; \ 996 clk_register_clkdev(clk, clkname, devname); \ 997 if (regnode) \ 998 clk_register_clkdev(clk, clkname, np->name); \ 999 did_register |= DID_REG_ ## regflag; \ 1000 pr_debug("clock alias name '%s' for dev '%s' pointer %p\n", \ 1001 clkname, devname, clk); \ 1002 } else { \ 1003 clk_put(clk); \ 1004 } \ 1005 } while (0) 1006 1007 /* 1008 * register source code provided fallback results for clock lookups, 1009 * these get consulted when OF based clock lookup fails (that is in the 1010 * case of not yet adjusted device tree data, where clock related specs 1011 * are missing) 1012 */ 1013 static void mpc5121_clk_provide_backwards_compat(void) 1014 { 1015 enum did_reg_flags { 1016 DID_REG_PSC = BIT(0), 1017 DID_REG_PSCFIFO = BIT(1), 1018 DID_REG_NFC = BIT(2), 1019 DID_REG_CAN = BIT(3), 1020 DID_REG_I2C = BIT(4), 1021 DID_REG_DIU = BIT(5), 1022 DID_REG_VIU = BIT(6), 1023 DID_REG_FEC = BIT(7), 1024 DID_REG_USB = BIT(8), 1025 DID_REG_PATA = BIT(9), 1026 }; 1027 1028 int did_register; 1029 struct device_node *np; 1030 struct resource res; 1031 int idx; 1032 char devname[32]; 1033 1034 did_register = 0; 1035 1036 FOR_NODES(mpc512x_select_psc_compat()) { 1037 NODE_PREP; 1038 idx = (res.start >> 8) & 0xf; 1039 NODE_CHK("ipg", clks[MPC512x_CLK_PSC0 + idx], 0, PSC); 1040 NODE_CHK("mclk", clks[MPC512x_CLK_PSC0_MCLK + idx], 0, PSC); 1041 } 1042 1043 FOR_NODES("fsl,mpc5121-psc-fifo") { 1044 NODE_PREP; 1045 NODE_CHK("ipg", clks[MPC512x_CLK_PSC_FIFO], 1, PSCFIFO); 1046 } 1047 1048 FOR_NODES("fsl,mpc5121-nfc") { 1049 NODE_PREP; 1050 NODE_CHK("ipg", clks[MPC512x_CLK_NFC], 0, NFC); 1051 } 1052 1053 FOR_NODES("fsl,mpc5121-mscan") { 1054 NODE_PREP; 1055 idx = 0; 1056 idx += (res.start & 0x2000) ? 2 : 0; 1057 idx += (res.start & 0x0080) ? 1 : 0; 1058 NODE_CHK("ipg", clks[MPC512x_CLK_BDLC], 0, CAN); 1059 NODE_CHK("mclk", clks[MPC512x_CLK_MSCAN0_MCLK + idx], 0, CAN); 1060 } 1061 1062 /* 1063 * do register the 'ips', 'sys', and 'ref' names globally 1064 * instead of inside each individual CAN node, as there is no 1065 * potential for a name conflict (in contrast to 'ipg' and 'mclk') 1066 */ 1067 if (did_register & DID_REG_CAN) { 1068 clk_register_clkdev(clks[MPC512x_CLK_IPS], "ips", NULL); 1069 clk_register_clkdev(clks[MPC512x_CLK_SYS], "sys", NULL); 1070 clk_register_clkdev(clks[MPC512x_CLK_REF], "ref", NULL); 1071 } 1072 1073 FOR_NODES("fsl,mpc5121-i2c") { 1074 NODE_PREP; 1075 NODE_CHK("ipg", clks[MPC512x_CLK_I2C], 0, I2C); 1076 } 1077 1078 /* 1079 * workaround for the fact that the I2C driver does an "anonymous" 1080 * lookup (NULL name spec, which yields the first clock spec) for 1081 * which we cannot register an alias -- a _global_ 'ipg' alias that 1082 * is not bound to any device name and returns the I2C clock item 1083 * is not a good idea 1084 * 1085 * so we have the lookup in the peripheral driver fail, which is 1086 * silent and non-fatal, and pre-enable the clock item here such 1087 * that register access is possible 1088 * 1089 * see commit b3bfce2b "i2c: mpc: cleanup clock API use" for 1090 * details, adjusting s/NULL/"ipg"/ in i2c-mpc.c would make this 1091 * workaround obsolete 1092 */ 1093 if (did_register & DID_REG_I2C) 1094 clk_prepare_enable(clks[MPC512x_CLK_I2C]); 1095 1096 FOR_NODES("fsl,mpc5121-diu") { 1097 NODE_PREP; 1098 NODE_CHK("ipg", clks[MPC512x_CLK_DIU], 1, DIU); 1099 } 1100 1101 FOR_NODES("fsl,mpc5121-viu") { 1102 NODE_PREP; 1103 NODE_CHK("ipg", clks[MPC512x_CLK_VIU], 0, VIU); 1104 } 1105 1106 /* 1107 * note that 2771399a "fs_enet: cleanup clock API use" did use the 1108 * "per" string for the clock lookup in contrast to the "ipg" name 1109 * which most other nodes are using -- this is not a fatal thing 1110 * but just something to keep in mind when doing compatibility 1111 * registration, it's a non-issue with up-to-date device tree data 1112 */ 1113 FOR_NODES("fsl,mpc5121-fec") { 1114 NODE_PREP; 1115 NODE_CHK("per", clks[MPC512x_CLK_FEC], 0, FEC); 1116 } 1117 FOR_NODES("fsl,mpc5121-fec-mdio") { 1118 NODE_PREP; 1119 NODE_CHK("per", clks[MPC512x_CLK_FEC], 0, FEC); 1120 } 1121 /* 1122 * MPC5125 has two FECs: FEC1 at 0x2800, FEC2 at 0x4800; 1123 * the clock items don't "form an array" since FEC2 was 1124 * added only later and was not allowed to shift all other 1125 * clock item indices, so the numbers aren't adjacent 1126 */ 1127 FOR_NODES("fsl,mpc5125-fec") { 1128 NODE_PREP; 1129 if (res.start & 0x4000) 1130 idx = MPC512x_CLK_FEC2; 1131 else 1132 idx = MPC512x_CLK_FEC; 1133 NODE_CHK("per", clks[idx], 0, FEC); 1134 } 1135 1136 FOR_NODES("fsl,mpc5121-usb2-dr") { 1137 NODE_PREP; 1138 idx = (res.start & 0x4000) ? 1 : 0; 1139 NODE_CHK("ipg", clks[MPC512x_CLK_USB1 + idx], 0, USB); 1140 } 1141 1142 FOR_NODES("fsl,mpc5121-pata") { 1143 NODE_PREP; 1144 NODE_CHK("ipg", clks[MPC512x_CLK_PATA], 0, PATA); 1145 } 1146 1147 /* 1148 * try to collapse diagnostics into a single line of output yet 1149 * provide a full list of what is missing, to avoid noise in the 1150 * absence of up-to-date device tree data -- backwards 1151 * compatibility to old DTBs is a requirement, updates may be 1152 * desirable or preferrable but are not at all mandatory 1153 */ 1154 if (did_register) { 1155 pr_notice("device tree lacks clock specs, adding fallbacks (0x%x,%s%s%s%s%s%s%s%s%s%s)\n", 1156 did_register, 1157 (did_register & DID_REG_PSC) ? " PSC" : "", 1158 (did_register & DID_REG_PSCFIFO) ? " PSCFIFO" : "", 1159 (did_register & DID_REG_NFC) ? " NFC" : "", 1160 (did_register & DID_REG_CAN) ? " CAN" : "", 1161 (did_register & DID_REG_I2C) ? " I2C" : "", 1162 (did_register & DID_REG_DIU) ? " DIU" : "", 1163 (did_register & DID_REG_VIU) ? " VIU" : "", 1164 (did_register & DID_REG_FEC) ? " FEC" : "", 1165 (did_register & DID_REG_USB) ? " USB" : "", 1166 (did_register & DID_REG_PATA) ? " PATA" : ""); 1167 } else { 1168 pr_debug("device tree has clock specs, no fallbacks added\n"); 1169 } 1170 } 1171 1172 /* 1173 * The "fixed-clock" nodes (which includes the oscillator node if the board's 1174 * DT provides one) has already been scanned by the of_clk_init() in 1175 * time_init(). 1176 */ 1177 int __init mpc5121_clk_init(void) 1178 { 1179 struct device_node *clk_np; 1180 int busfreq; 1181 1182 /* map the clock control registers */ 1183 clk_np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-clock"); 1184 if (!clk_np) 1185 return -ENODEV; 1186 clkregs = of_iomap(clk_np, 0); 1187 WARN_ON(!clkregs); 1188 1189 /* determine the SoC variant we run on */ 1190 mpc512x_clk_determine_soc(); 1191 1192 /* invalidate all not yet registered clock slots */ 1193 mpc512x_clk_preset_data(); 1194 1195 /* 1196 * add a dummy clock for those situations where a clock spec is 1197 * required yet no real clock is involved 1198 */ 1199 clks[MPC512x_CLK_DUMMY] = mpc512x_clk_fixed("dummy", 0); 1200 1201 /* 1202 * have all the real nodes in the clock tree populated from REF 1203 * down to all leaves, either starting from the OSC node or from 1204 * a REF root that was created from the IPS bus clock input 1205 */ 1206 busfreq = get_freq_from_dt("bus-frequency"); 1207 mpc512x_clk_setup_clock_tree(clk_np, busfreq); 1208 1209 /* register as an OF clock provider */ 1210 mpc5121_clk_register_of_provider(clk_np); 1211 1212 /* 1213 * unbreak not yet adjusted peripheral drivers during migration 1214 * towards fully operational common clock support, and allow 1215 * operation in the absence of clock related device tree specs 1216 */ 1217 mpc5121_clk_provide_migration_support(); 1218 mpc5121_clk_provide_backwards_compat(); 1219 1220 return 0; 1221 } 1222