1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Marvell PXA27x family clocks 4 * 5 * Copyright (C) 2014 Robert Jarzmik 6 * 7 * Heavily inspired from former arch/arm/mach-pxa/clock.c. 8 */ 9 #include <linux/clk-provider.h> 10 #include <mach/pxa2xx-regs.h> 11 #include <linux/io.h> 12 #include <linux/clk.h> 13 #include <linux/clkdev.h> 14 #include <linux/of.h> 15 16 #include <mach/smemc.h> 17 18 #include <dt-bindings/clock/pxa-clock.h> 19 #include "clk-pxa.h" 20 21 #define KHz 1000 22 #define MHz (1000 * 1000) 23 24 enum { 25 PXA_CORE_13Mhz = 0, 26 PXA_CORE_RUN, 27 PXA_CORE_TURBO, 28 }; 29 30 enum { 31 PXA_BUS_13Mhz = 0, 32 PXA_BUS_RUN, 33 }; 34 35 enum { 36 PXA_LCD_13Mhz = 0, 37 PXA_LCD_RUN, 38 }; 39 40 enum { 41 PXA_MEM_13Mhz = 0, 42 PXA_MEM_SYSTEM_BUS, 43 PXA_MEM_RUN, 44 }; 45 46 #define PXA27x_CLKCFG(B, HT, T) \ 47 (CLKCFG_FCS | \ 48 ((B) ? CLKCFG_FASTBUS : 0) | \ 49 ((HT) ? CLKCFG_HALFTURBO : 0) | \ 50 ((T) ? CLKCFG_TURBO : 0)) 51 #define PXA27x_CCCR(A, L, N2) (A << 25 | N2 << 7 | L) 52 53 #define MDCNFG_DRAC2(mdcnfg) (((mdcnfg) >> 21) & 0x3) 54 #define MDCNFG_DRAC0(mdcnfg) (((mdcnfg) >> 5) & 0x3) 55 56 /* Define the refresh period in mSec for the SDRAM and the number of rows */ 57 #define SDRAM_TREF 64 /* standard 64ms SDRAM */ 58 59 static const char * const get_freq_khz[] = { 60 "core", "run", "cpll", "memory", 61 "system_bus" 62 }; 63 64 static int get_sdram_rows(void) 65 { 66 static int sdram_rows; 67 unsigned int drac2 = 0, drac0 = 0; 68 u32 mdcnfg; 69 70 if (sdram_rows) 71 return sdram_rows; 72 73 mdcnfg = readl_relaxed(MDCNFG); 74 75 if (mdcnfg & (MDCNFG_DE2 | MDCNFG_DE3)) 76 drac2 = MDCNFG_DRAC2(mdcnfg); 77 78 if (mdcnfg & (MDCNFG_DE0 | MDCNFG_DE1)) 79 drac0 = MDCNFG_DRAC0(mdcnfg); 80 81 sdram_rows = 1 << (11 + max(drac0, drac2)); 82 return sdram_rows; 83 } 84 85 static u32 mdrefr_dri(unsigned int freq_khz) 86 { 87 u32 interval = freq_khz * SDRAM_TREF / get_sdram_rows(); 88 89 return (interval - 31) / 32; 90 } 91 92 /* 93 * Get the clock frequency as reflected by CCSR and the turbo flag. 94 * We assume these values have been applied via a fcs. 95 * If info is not 0 we also display the current settings. 96 */ 97 unsigned int pxa27x_get_clk_frequency_khz(int info) 98 { 99 struct clk *clk; 100 unsigned long clks[5]; 101 int i; 102 103 for (i = 0; i < 5; i++) { 104 clk = clk_get(NULL, get_freq_khz[i]); 105 if (IS_ERR(clk)) { 106 clks[i] = 0; 107 } else { 108 clks[i] = clk_get_rate(clk); 109 clk_put(clk); 110 } 111 } 112 if (info) { 113 pr_info("Run Mode clock: %ld.%02ldMHz\n", 114 clks[1] / 1000000, (clks[1] % 1000000) / 10000); 115 pr_info("Turbo Mode clock: %ld.%02ldMHz\n", 116 clks[2] / 1000000, (clks[2] % 1000000) / 10000); 117 pr_info("Memory clock: %ld.%02ldMHz\n", 118 clks[3] / 1000000, (clks[3] % 1000000) / 10000); 119 pr_info("System bus clock: %ld.%02ldMHz\n", 120 clks[4] / 1000000, (clks[4] % 1000000) / 10000); 121 } 122 return (unsigned int)clks[0] / KHz; 123 } 124 125 bool pxa27x_is_ppll_disabled(void) 126 { 127 unsigned long ccsr = readl(CCSR); 128 129 return ccsr & (1 << CCCR_PPDIS_BIT); 130 } 131 132 #define PXA27X_CKEN(dev_id, con_id, parents, mult_hp, div_hp, \ 133 bit, is_lp, flags) \ 134 PXA_CKEN(dev_id, con_id, bit, parents, 1, 1, mult_hp, div_hp, \ 135 is_lp, CKEN, CKEN_ ## bit, flags) 136 #define PXA27X_PBUS_CKEN(dev_id, con_id, bit, mult_hp, div_hp, delay) \ 137 PXA27X_CKEN(dev_id, con_id, pxa27x_pbus_parents, mult_hp, \ 138 div_hp, bit, pxa27x_is_ppll_disabled, 0) 139 140 PARENTS(pxa27x_pbus) = { "osc_13mhz", "ppll_312mhz" }; 141 PARENTS(pxa27x_sbus) = { "system_bus", "system_bus" }; 142 PARENTS(pxa27x_32Mhz_bus) = { "osc_32_768khz", "osc_32_768khz" }; 143 PARENTS(pxa27x_lcd_bus) = { "lcd_base", "lcd_base" }; 144 PARENTS(pxa27x_membus) = { "lcd_base", "lcd_base" }; 145 146 #define PXA27X_CKEN_1RATE(dev_id, con_id, bit, parents, delay) \ 147 PXA_CKEN_1RATE(dev_id, con_id, bit, parents, \ 148 CKEN, CKEN_ ## bit, 0) 149 #define PXA27X_CKEN_1RATE_AO(dev_id, con_id, bit, parents, delay) \ 150 PXA_CKEN_1RATE(dev_id, con_id, bit, parents, \ 151 CKEN, CKEN_ ## bit, CLK_IGNORE_UNUSED) 152 153 static struct desc_clk_cken pxa27x_clocks[] __initdata = { 154 PXA27X_PBUS_CKEN("pxa2xx-uart.0", NULL, FFUART, 2, 42, 1), 155 PXA27X_PBUS_CKEN("pxa2xx-uart.1", NULL, BTUART, 2, 42, 1), 156 PXA27X_PBUS_CKEN("pxa2xx-uart.2", NULL, STUART, 2, 42, 1), 157 PXA27X_PBUS_CKEN("pxa2xx-i2s", NULL, I2S, 2, 51, 0), 158 PXA27X_PBUS_CKEN("pxa2xx-i2c.0", NULL, I2C, 2, 19, 0), 159 PXA27X_PBUS_CKEN("pxa27x-udc", NULL, USB, 2, 13, 5), 160 PXA27X_PBUS_CKEN("pxa2xx-mci.0", NULL, MMC, 2, 32, 0), 161 PXA27X_PBUS_CKEN("pxa2xx-ir", "FICPCLK", FICP, 2, 13, 0), 162 PXA27X_PBUS_CKEN("pxa27x-ohci", NULL, USBHOST, 2, 13, 0), 163 PXA27X_PBUS_CKEN("pxa2xx-i2c.1", NULL, PWRI2C, 1, 24, 0), 164 PXA27X_PBUS_CKEN("pxa27x-ssp.0", NULL, SSP1, 1, 24, 0), 165 PXA27X_PBUS_CKEN("pxa27x-ssp.1", NULL, SSP2, 1, 24, 0), 166 PXA27X_PBUS_CKEN("pxa27x-ssp.2", NULL, SSP3, 1, 24, 0), 167 PXA27X_PBUS_CKEN("pxa27x-pwm.0", NULL, PWM0, 1, 24, 0), 168 PXA27X_PBUS_CKEN("pxa27x-pwm.1", NULL, PWM1, 1, 24, 0), 169 PXA27X_PBUS_CKEN(NULL, "MSLCLK", MSL, 2, 13, 0), 170 PXA27X_PBUS_CKEN(NULL, "USIMCLK", USIM, 2, 13, 0), 171 PXA27X_PBUS_CKEN(NULL, "MSTKCLK", MEMSTK, 2, 32, 0), 172 PXA27X_PBUS_CKEN(NULL, "AC97CLK", AC97, 1, 1, 0), 173 PXA27X_PBUS_CKEN(NULL, "AC97CONFCLK", AC97CONF, 1, 1, 0), 174 PXA27X_PBUS_CKEN(NULL, "OSTIMER0", OSTIMER, 1, 96, 0), 175 176 PXA27X_CKEN_1RATE("pxa27x-keypad", NULL, KEYPAD, 177 pxa27x_32Mhz_bus_parents, 0), 178 PXA27X_CKEN_1RATE(NULL, "IMCLK", IM, pxa27x_sbus_parents, 0), 179 PXA27X_CKEN_1RATE("pxa2xx-fb", NULL, LCD, pxa27x_lcd_bus_parents, 0), 180 PXA27X_CKEN_1RATE("pxa27x-camera.0", NULL, CAMERA, 181 pxa27x_lcd_bus_parents, 0), 182 PXA27X_CKEN_1RATE_AO("pxa2xx-pcmcia", NULL, MEMC, 183 pxa27x_membus_parents, 0), 184 185 }; 186 187 /* 188 * PXA270 definitions 189 * 190 * For the PXA27x: 191 * Control variables are A, L, 2N for CCCR; B, HT, T for CLKCFG. 192 * 193 * A = 0 => memory controller clock from table 3-7, 194 * A = 1 => memory controller clock = system bus clock 195 * Run mode frequency = 13 MHz * L 196 * Turbo mode frequency = 13 MHz * L * N 197 * System bus frequency = 13 MHz * L / (B + 1) 198 * 199 * In CCCR: 200 * A = 1 201 * L = 16 oscillator to run mode ratio 202 * 2N = 6 2 * (turbo mode to run mode ratio) 203 * 204 * In CCLKCFG: 205 * B = 1 Fast bus mode 206 * HT = 0 Half-Turbo mode 207 * T = 1 Turbo mode 208 * 209 * For now, just support some of the combinations in table 3-7 of 210 * PXA27x Processor Family Developer's Manual to simplify frequency 211 * change sequences. 212 */ 213 static struct pxa2xx_freq pxa27x_freqs[] = { 214 {104000000, 104000, PXA27x_CCCR(1, 8, 2), 0, PXA27x_CLKCFG(1, 0, 1) }, 215 {156000000, 104000, PXA27x_CCCR(1, 8, 3), 0, PXA27x_CLKCFG(1, 0, 1) }, 216 {208000000, 208000, PXA27x_CCCR(0, 16, 2), 1, PXA27x_CLKCFG(0, 0, 1) }, 217 {312000000, 208000, PXA27x_CCCR(1, 16, 3), 1, PXA27x_CLKCFG(1, 0, 1) }, 218 {416000000, 208000, PXA27x_CCCR(1, 16, 4), 1, PXA27x_CLKCFG(1, 0, 1) }, 219 {520000000, 208000, PXA27x_CCCR(1, 16, 5), 1, PXA27x_CLKCFG(1, 0, 1) }, 220 {624000000, 208000, PXA27x_CCCR(1, 16, 6), 1, PXA27x_CLKCFG(1, 0, 1) }, 221 }; 222 223 static unsigned long clk_pxa27x_cpll_get_rate(struct clk_hw *hw, 224 unsigned long parent_rate) 225 { 226 unsigned long clkcfg; 227 unsigned int t, ht; 228 unsigned int l, L, n2, N; 229 unsigned long ccsr = readl(CCSR); 230 231 asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg)); 232 t = clkcfg & (1 << 0); 233 ht = clkcfg & (1 << 2); 234 235 l = ccsr & CCSR_L_MASK; 236 n2 = (ccsr & CCSR_N2_MASK) >> CCSR_N2_SHIFT; 237 L = l * parent_rate; 238 N = (L * n2) / 2; 239 240 return N; 241 } 242 243 static int clk_pxa27x_cpll_determine_rate(struct clk_hw *hw, 244 struct clk_rate_request *req) 245 { 246 return pxa2xx_determine_rate(req, pxa27x_freqs, 247 ARRAY_SIZE(pxa27x_freqs)); 248 } 249 250 static int clk_pxa27x_cpll_set_rate(struct clk_hw *hw, unsigned long rate, 251 unsigned long parent_rate) 252 { 253 int i; 254 255 pr_debug("%s(rate=%lu parent_rate=%lu)\n", __func__, rate, parent_rate); 256 for (i = 0; i < ARRAY_SIZE(pxa27x_freqs); i++) 257 if (pxa27x_freqs[i].cpll == rate) 258 break; 259 260 if (i >= ARRAY_SIZE(pxa27x_freqs)) 261 return -EINVAL; 262 263 pxa2xx_cpll_change(&pxa27x_freqs[i], mdrefr_dri, MDREFR, CCCR); 264 return 0; 265 } 266 267 PARENTS(clk_pxa27x_cpll) = { "osc_13mhz" }; 268 RATE_OPS(clk_pxa27x_cpll, "cpll"); 269 270 static unsigned long clk_pxa27x_lcd_base_get_rate(struct clk_hw *hw, 271 unsigned long parent_rate) 272 { 273 unsigned int l, osc_forced; 274 unsigned long ccsr = readl(CCSR); 275 unsigned long cccr = readl(CCCR); 276 277 l = ccsr & CCSR_L_MASK; 278 osc_forced = ccsr & (1 << CCCR_CPDIS_BIT); 279 if (osc_forced) { 280 if (cccr & (1 << CCCR_LCD_26_BIT)) 281 return parent_rate * 2; 282 else 283 return parent_rate; 284 } 285 286 if (l <= 7) 287 return parent_rate; 288 if (l <= 16) 289 return parent_rate / 2; 290 return parent_rate / 4; 291 } 292 293 static u8 clk_pxa27x_lcd_base_get_parent(struct clk_hw *hw) 294 { 295 unsigned int osc_forced; 296 unsigned long ccsr = readl(CCSR); 297 298 osc_forced = ccsr & (1 << CCCR_CPDIS_BIT); 299 if (osc_forced) 300 return PXA_LCD_13Mhz; 301 else 302 return PXA_LCD_RUN; 303 } 304 305 PARENTS(clk_pxa27x_lcd_base) = { "osc_13mhz", "run" }; 306 MUX_RO_RATE_RO_OPS(clk_pxa27x_lcd_base, "lcd_base"); 307 308 static void __init pxa27x_register_plls(void) 309 { 310 clk_register_fixed_rate(NULL, "osc_13mhz", NULL, 311 CLK_GET_RATE_NOCACHE, 312 13 * MHz); 313 clkdev_pxa_register(CLK_OSC32k768, "osc_32_768khz", NULL, 314 clk_register_fixed_rate(NULL, "osc_32_768khz", NULL, 315 CLK_GET_RATE_NOCACHE, 316 32768 * KHz)); 317 clk_register_fixed_rate(NULL, "clk_dummy", NULL, 0, 0); 318 clk_register_fixed_factor(NULL, "ppll_312mhz", "osc_13mhz", 0, 24, 1); 319 } 320 321 static u8 clk_pxa27x_core_get_parent(struct clk_hw *hw) 322 { 323 unsigned long clkcfg; 324 unsigned int t, ht, osc_forced; 325 unsigned long ccsr = readl(CCSR); 326 327 osc_forced = ccsr & (1 << CCCR_CPDIS_BIT); 328 if (osc_forced) 329 return PXA_CORE_13Mhz; 330 331 asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg)); 332 t = clkcfg & (1 << 0); 333 ht = clkcfg & (1 << 2); 334 335 if (ht || t) 336 return PXA_CORE_TURBO; 337 return PXA_CORE_RUN; 338 } 339 340 static int clk_pxa27x_core_set_parent(struct clk_hw *hw, u8 index) 341 { 342 if (index > PXA_CORE_TURBO) 343 return -EINVAL; 344 345 pxa2xx_core_turbo_switch(index == PXA_CORE_TURBO); 346 347 return 0; 348 } 349 350 static int clk_pxa27x_core_determine_rate(struct clk_hw *hw, 351 struct clk_rate_request *req) 352 { 353 return __clk_mux_determine_rate(hw, req); 354 } 355 356 PARENTS(clk_pxa27x_core) = { "osc_13mhz", "run", "cpll" }; 357 MUX_OPS(clk_pxa27x_core, "core", CLK_SET_RATE_PARENT); 358 359 static unsigned long clk_pxa27x_run_get_rate(struct clk_hw *hw, 360 unsigned long parent_rate) 361 { 362 unsigned long ccsr = readl(CCSR); 363 unsigned int n2 = (ccsr & CCSR_N2_MASK) >> CCSR_N2_SHIFT; 364 365 return (parent_rate / n2) * 2; 366 } 367 PARENTS(clk_pxa27x_run) = { "cpll" }; 368 RATE_RO_OPS(clk_pxa27x_run, "run"); 369 370 static void __init pxa27x_register_core(void) 371 { 372 clkdev_pxa_register(CLK_NONE, "cpll", NULL, 373 clk_register_clk_pxa27x_cpll()); 374 clkdev_pxa_register(CLK_NONE, "run", NULL, 375 clk_register_clk_pxa27x_run()); 376 clkdev_pxa_register(CLK_CORE, "core", NULL, 377 clk_register_clk_pxa27x_core()); 378 } 379 380 static unsigned long clk_pxa27x_system_bus_get_rate(struct clk_hw *hw, 381 unsigned long parent_rate) 382 { 383 unsigned long clkcfg; 384 unsigned int b, osc_forced; 385 unsigned long ccsr = readl(CCSR); 386 387 osc_forced = ccsr & (1 << CCCR_CPDIS_BIT); 388 asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg)); 389 b = clkcfg & (1 << 3); 390 391 if (osc_forced) 392 return parent_rate; 393 if (b) 394 return parent_rate; 395 else 396 return parent_rate / 2; 397 } 398 399 static u8 clk_pxa27x_system_bus_get_parent(struct clk_hw *hw) 400 { 401 unsigned int osc_forced; 402 unsigned long ccsr = readl(CCSR); 403 404 osc_forced = ccsr & (1 << CCCR_CPDIS_BIT); 405 if (osc_forced) 406 return PXA_BUS_13Mhz; 407 else 408 return PXA_BUS_RUN; 409 } 410 411 PARENTS(clk_pxa27x_system_bus) = { "osc_13mhz", "run" }; 412 MUX_RO_RATE_RO_OPS(clk_pxa27x_system_bus, "system_bus"); 413 414 static unsigned long clk_pxa27x_memory_get_rate(struct clk_hw *hw, 415 unsigned long parent_rate) 416 { 417 unsigned int a, l, osc_forced; 418 unsigned long cccr = readl(CCCR); 419 unsigned long ccsr = readl(CCSR); 420 421 osc_forced = ccsr & (1 << CCCR_CPDIS_BIT); 422 a = cccr & (1 << CCCR_A_BIT); 423 l = ccsr & CCSR_L_MASK; 424 425 if (osc_forced || a) 426 return parent_rate; 427 if (l <= 10) 428 return parent_rate; 429 if (l <= 20) 430 return parent_rate / 2; 431 return parent_rate / 4; 432 } 433 434 static u8 clk_pxa27x_memory_get_parent(struct clk_hw *hw) 435 { 436 unsigned int osc_forced, a; 437 unsigned long cccr = readl(CCCR); 438 unsigned long ccsr = readl(CCSR); 439 440 osc_forced = ccsr & (1 << CCCR_CPDIS_BIT); 441 a = cccr & (1 << CCCR_A_BIT); 442 if (osc_forced) 443 return PXA_MEM_13Mhz; 444 if (a) 445 return PXA_MEM_SYSTEM_BUS; 446 else 447 return PXA_MEM_RUN; 448 } 449 450 PARENTS(clk_pxa27x_memory) = { "osc_13mhz", "system_bus", "run" }; 451 MUX_RO_RATE_RO_OPS(clk_pxa27x_memory, "memory"); 452 453 #define DUMMY_CLK(_con_id, _dev_id, _parent) \ 454 { .con_id = _con_id, .dev_id = _dev_id, .parent = _parent } 455 struct dummy_clk { 456 const char *con_id; 457 const char *dev_id; 458 const char *parent; 459 }; 460 static struct dummy_clk dummy_clks[] __initdata = { 461 DUMMY_CLK(NULL, "pxa27x-gpio", "osc_32_768khz"), 462 DUMMY_CLK(NULL, "pxa-rtc", "osc_32_768khz"), 463 DUMMY_CLK(NULL, "sa1100-rtc", "osc_32_768khz"), 464 DUMMY_CLK("UARTCLK", "pxa2xx-ir", "STUART"), 465 }; 466 467 static void __init pxa27x_dummy_clocks_init(void) 468 { 469 struct clk *clk; 470 struct dummy_clk *d; 471 const char *name; 472 int i; 473 474 for (i = 0; i < ARRAY_SIZE(dummy_clks); i++) { 475 d = &dummy_clks[i]; 476 name = d->dev_id ? d->dev_id : d->con_id; 477 clk = clk_register_fixed_factor(NULL, name, d->parent, 0, 1, 1); 478 clk_register_clkdev(clk, d->con_id, d->dev_id); 479 } 480 } 481 482 static void __init pxa27x_base_clocks_init(void) 483 { 484 pxa27x_register_plls(); 485 pxa27x_register_core(); 486 clkdev_pxa_register(CLK_NONE, "system_bus", NULL, 487 clk_register_clk_pxa27x_system_bus()); 488 clkdev_pxa_register(CLK_NONE, "memory", NULL, 489 clk_register_clk_pxa27x_memory()); 490 clk_register_clk_pxa27x_lcd_base(); 491 } 492 493 int __init pxa27x_clocks_init(void) 494 { 495 pxa27x_base_clocks_init(); 496 pxa27x_dummy_clocks_init(); 497 return clk_pxa_cken_init(pxa27x_clocks, ARRAY_SIZE(pxa27x_clocks)); 498 } 499 500 static void __init pxa27x_dt_clocks_init(struct device_node *np) 501 { 502 pxa27x_clocks_init(); 503 clk_pxa_dt_common_init(np); 504 } 505 CLK_OF_DECLARE(pxa_clks, "marvell,pxa270-clocks", pxa27x_dt_clocks_init); 506