1 /* 2 * Copyright (C) 2018-2019, STMicroelectronics - All Rights Reserved 3 * 4 * SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause 5 */ 6 7 #include <assert.h> 8 #include <errno.h> 9 #include <stdint.h> 10 #include <stdio.h> 11 12 #include <libfdt.h> 13 14 #include <platform_def.h> 15 16 #include <arch.h> 17 #include <arch_helpers.h> 18 #include <common/debug.h> 19 #include <common/fdt_wrappers.h> 20 #include <drivers/delay_timer.h> 21 #include <drivers/generic_delay_timer.h> 22 #include <drivers/st/stm32mp_clkfunc.h> 23 #include <drivers/st/stm32mp1_clk.h> 24 #include <drivers/st/stm32mp1_rcc.h> 25 #include <dt-bindings/clock/stm32mp1-clksrc.h> 26 #include <lib/mmio.h> 27 #include <lib/spinlock.h> 28 #include <lib/utils_def.h> 29 #include <plat/common/platform.h> 30 31 #define MAX_HSI_HZ 64000000 32 #define USB_PHY_48_MHZ 48000000 33 34 #define TIMEOUT_US_200MS U(200000) 35 #define TIMEOUT_US_1S U(1000000) 36 37 #define PLLRDY_TIMEOUT TIMEOUT_US_200MS 38 #define CLKSRC_TIMEOUT TIMEOUT_US_200MS 39 #define CLKDIV_TIMEOUT TIMEOUT_US_200MS 40 #define HSIDIV_TIMEOUT TIMEOUT_US_200MS 41 #define OSCRDY_TIMEOUT TIMEOUT_US_1S 42 43 const char *stm32mp_osc_node_label[NB_OSC] = { 44 [_LSI] = "clk-lsi", 45 [_LSE] = "clk-lse", 46 [_HSI] = "clk-hsi", 47 [_HSE] = "clk-hse", 48 [_CSI] = "clk-csi", 49 [_I2S_CKIN] = "i2s_ckin", 50 }; 51 52 enum stm32mp1_parent_id { 53 /* Oscillators are defined in enum stm32mp_osc_id */ 54 55 /* Other parent source */ 56 _HSI_KER = NB_OSC, 57 _HSE_KER, 58 _HSE_KER_DIV2, 59 _CSI_KER, 60 _PLL1_P, 61 _PLL1_Q, 62 _PLL1_R, 63 _PLL2_P, 64 _PLL2_Q, 65 _PLL2_R, 66 _PLL3_P, 67 _PLL3_Q, 68 _PLL3_R, 69 _PLL4_P, 70 _PLL4_Q, 71 _PLL4_R, 72 _ACLK, 73 _PCLK1, 74 _PCLK2, 75 _PCLK3, 76 _PCLK4, 77 _PCLK5, 78 _HCLK6, 79 _HCLK2, 80 _CK_PER, 81 _CK_MPU, 82 _CK_MCU, 83 _USB_PHY_48, 84 _PARENT_NB, 85 _UNKNOWN_ID = 0xff, 86 }; 87 88 /* Lists only the parent clock we are interested in */ 89 enum stm32mp1_parent_sel { 90 _I2C12_SEL, 91 _I2C35_SEL, 92 _STGEN_SEL, 93 _I2C46_SEL, 94 _SPI6_SEL, 95 _UART1_SEL, 96 _RNG1_SEL, 97 _UART6_SEL, 98 _UART24_SEL, 99 _UART35_SEL, 100 _UART78_SEL, 101 _SDMMC12_SEL, 102 _SDMMC3_SEL, 103 _QSPI_SEL, 104 _FMC_SEL, 105 _AXIS_SEL, 106 _MCUS_SEL, 107 _USBPHY_SEL, 108 _USBO_SEL, 109 _MPU_SEL, 110 _PER_SEL, 111 _RTC_SEL, 112 _PARENT_SEL_NB, 113 _UNKNOWN_SEL = 0xff, 114 }; 115 116 /* State the parent clock ID straight related to a clock */ 117 static const uint8_t parent_id_clock_id[_PARENT_NB] = { 118 [_HSE] = CK_HSE, 119 [_HSI] = CK_HSI, 120 [_CSI] = CK_CSI, 121 [_LSE] = CK_LSE, 122 [_LSI] = CK_LSI, 123 [_I2S_CKIN] = _UNKNOWN_ID, 124 [_USB_PHY_48] = _UNKNOWN_ID, 125 [_HSI_KER] = CK_HSI, 126 [_HSE_KER] = CK_HSE, 127 [_HSE_KER_DIV2] = CK_HSE_DIV2, 128 [_CSI_KER] = CK_CSI, 129 [_PLL1_P] = PLL1_P, 130 [_PLL1_Q] = PLL1_Q, 131 [_PLL1_R] = PLL1_R, 132 [_PLL2_P] = PLL2_P, 133 [_PLL2_Q] = PLL2_Q, 134 [_PLL2_R] = PLL2_R, 135 [_PLL3_P] = PLL3_P, 136 [_PLL3_Q] = PLL3_Q, 137 [_PLL3_R] = PLL3_R, 138 [_PLL4_P] = PLL4_P, 139 [_PLL4_Q] = PLL4_Q, 140 [_PLL4_R] = PLL4_R, 141 [_ACLK] = CK_AXI, 142 [_PCLK1] = CK_AXI, 143 [_PCLK2] = CK_AXI, 144 [_PCLK3] = CK_AXI, 145 [_PCLK4] = CK_AXI, 146 [_PCLK5] = CK_AXI, 147 [_CK_PER] = CK_PER, 148 [_CK_MPU] = CK_MPU, 149 [_CK_MCU] = CK_MCU, 150 }; 151 152 static unsigned int clock_id2parent_id(unsigned long id) 153 { 154 unsigned int n; 155 156 for (n = 0U; n < ARRAY_SIZE(parent_id_clock_id); n++) { 157 if (parent_id_clock_id[n] == id) { 158 return n; 159 } 160 } 161 162 return _UNKNOWN_ID; 163 } 164 165 enum stm32mp1_pll_id { 166 _PLL1, 167 _PLL2, 168 _PLL3, 169 _PLL4, 170 _PLL_NB 171 }; 172 173 enum stm32mp1_div_id { 174 _DIV_P, 175 _DIV_Q, 176 _DIV_R, 177 _DIV_NB, 178 }; 179 180 enum stm32mp1_clksrc_id { 181 CLKSRC_MPU, 182 CLKSRC_AXI, 183 CLKSRC_MCU, 184 CLKSRC_PLL12, 185 CLKSRC_PLL3, 186 CLKSRC_PLL4, 187 CLKSRC_RTC, 188 CLKSRC_MCO1, 189 CLKSRC_MCO2, 190 CLKSRC_NB 191 }; 192 193 enum stm32mp1_clkdiv_id { 194 CLKDIV_MPU, 195 CLKDIV_AXI, 196 CLKDIV_MCU, 197 CLKDIV_APB1, 198 CLKDIV_APB2, 199 CLKDIV_APB3, 200 CLKDIV_APB4, 201 CLKDIV_APB5, 202 CLKDIV_RTC, 203 CLKDIV_MCO1, 204 CLKDIV_MCO2, 205 CLKDIV_NB 206 }; 207 208 enum stm32mp1_pllcfg { 209 PLLCFG_M, 210 PLLCFG_N, 211 PLLCFG_P, 212 PLLCFG_Q, 213 PLLCFG_R, 214 PLLCFG_O, 215 PLLCFG_NB 216 }; 217 218 enum stm32mp1_pllcsg { 219 PLLCSG_MOD_PER, 220 PLLCSG_INC_STEP, 221 PLLCSG_SSCG_MODE, 222 PLLCSG_NB 223 }; 224 225 enum stm32mp1_plltype { 226 PLL_800, 227 PLL_1600, 228 PLL_TYPE_NB 229 }; 230 231 struct stm32mp1_pll { 232 uint8_t refclk_min; 233 uint8_t refclk_max; 234 uint8_t divn_max; 235 }; 236 237 struct stm32mp1_clk_gate { 238 uint16_t offset; 239 uint8_t bit; 240 uint8_t index; 241 uint8_t set_clr; 242 uint8_t sel; /* Relates to enum stm32mp1_parent_sel */ 243 uint8_t fixed; /* Relates to enum stm32mp1_parent_id */ 244 }; 245 246 struct stm32mp1_clk_sel { 247 uint16_t offset; 248 uint8_t src; 249 uint8_t msk; 250 uint8_t nb_parent; 251 const uint8_t *parent; 252 }; 253 254 #define REFCLK_SIZE 4 255 struct stm32mp1_clk_pll { 256 enum stm32mp1_plltype plltype; 257 uint16_t rckxselr; 258 uint16_t pllxcfgr1; 259 uint16_t pllxcfgr2; 260 uint16_t pllxfracr; 261 uint16_t pllxcr; 262 uint16_t pllxcsgr; 263 enum stm32mp_osc_id refclk[REFCLK_SIZE]; 264 }; 265 266 /* Clocks with selectable source and non set/clr register access */ 267 #define _CLK_SELEC(off, b, idx, s) \ 268 { \ 269 .offset = (off), \ 270 .bit = (b), \ 271 .index = (idx), \ 272 .set_clr = 0, \ 273 .sel = (s), \ 274 .fixed = _UNKNOWN_ID, \ 275 } 276 277 /* Clocks with fixed source and non set/clr register access */ 278 #define _CLK_FIXED(off, b, idx, f) \ 279 { \ 280 .offset = (off), \ 281 .bit = (b), \ 282 .index = (idx), \ 283 .set_clr = 0, \ 284 .sel = _UNKNOWN_SEL, \ 285 .fixed = (f), \ 286 } 287 288 /* Clocks with selectable source and set/clr register access */ 289 #define _CLK_SC_SELEC(off, b, idx, s) \ 290 { \ 291 .offset = (off), \ 292 .bit = (b), \ 293 .index = (idx), \ 294 .set_clr = 1, \ 295 .sel = (s), \ 296 .fixed = _UNKNOWN_ID, \ 297 } 298 299 /* Clocks with fixed source and set/clr register access */ 300 #define _CLK_SC_FIXED(off, b, idx, f) \ 301 { \ 302 .offset = (off), \ 303 .bit = (b), \ 304 .index = (idx), \ 305 .set_clr = 1, \ 306 .sel = _UNKNOWN_SEL, \ 307 .fixed = (f), \ 308 } 309 310 #define _CLK_PARENT_SEL(_label, _rcc_selr, _parents) \ 311 [_ ## _label ## _SEL] = { \ 312 .offset = _rcc_selr, \ 313 .src = _rcc_selr ## _ ## _label ## SRC_SHIFT, \ 314 .msk = (_rcc_selr ## _ ## _label ## SRC_MASK) >> \ 315 (_rcc_selr ## _ ## _label ## SRC_SHIFT), \ 316 .parent = (_parents), \ 317 .nb_parent = ARRAY_SIZE(_parents) \ 318 } 319 320 #define _CLK_PLL(idx, type, off1, off2, off3, \ 321 off4, off5, off6, \ 322 p1, p2, p3, p4) \ 323 [(idx)] = { \ 324 .plltype = (type), \ 325 .rckxselr = (off1), \ 326 .pllxcfgr1 = (off2), \ 327 .pllxcfgr2 = (off3), \ 328 .pllxfracr = (off4), \ 329 .pllxcr = (off5), \ 330 .pllxcsgr = (off6), \ 331 .refclk[0] = (p1), \ 332 .refclk[1] = (p2), \ 333 .refclk[2] = (p3), \ 334 .refclk[3] = (p4), \ 335 } 336 337 #define NB_GATES ARRAY_SIZE(stm32mp1_clk_gate) 338 339 static const struct stm32mp1_clk_gate stm32mp1_clk_gate[] = { 340 _CLK_FIXED(RCC_DDRITFCR, 0, DDRC1, _ACLK), 341 _CLK_FIXED(RCC_DDRITFCR, 1, DDRC1LP, _ACLK), 342 _CLK_FIXED(RCC_DDRITFCR, 2, DDRC2, _ACLK), 343 _CLK_FIXED(RCC_DDRITFCR, 3, DDRC2LP, _ACLK), 344 _CLK_FIXED(RCC_DDRITFCR, 4, DDRPHYC, _PLL2_R), 345 _CLK_FIXED(RCC_DDRITFCR, 5, DDRPHYCLP, _PLL2_R), 346 _CLK_FIXED(RCC_DDRITFCR, 6, DDRCAPB, _PCLK4), 347 _CLK_FIXED(RCC_DDRITFCR, 7, DDRCAPBLP, _PCLK4), 348 _CLK_FIXED(RCC_DDRITFCR, 8, AXIDCG, _ACLK), 349 _CLK_FIXED(RCC_DDRITFCR, 9, DDRPHYCAPB, _PCLK4), 350 _CLK_FIXED(RCC_DDRITFCR, 10, DDRPHYCAPBLP, _PCLK4), 351 352 _CLK_SC_FIXED(RCC_MP_APB1ENSETR, 6, TIM12_K, _PCLK1), 353 _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 14, USART2_K, _UART24_SEL), 354 _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 15, USART3_K, _UART35_SEL), 355 _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 16, UART4_K, _UART24_SEL), 356 _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 17, UART5_K, _UART35_SEL), 357 _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 18, UART7_K, _UART78_SEL), 358 _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 19, UART8_K, _UART78_SEL), 359 _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 21, I2C1_K, _I2C12_SEL), 360 _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 22, I2C2_K, _I2C12_SEL), 361 _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 23, I2C3_K, _I2C35_SEL), 362 _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 24, I2C5_K, _I2C35_SEL), 363 364 _CLK_SC_FIXED(RCC_MP_APB2ENSETR, 2, TIM15_K, _PCLK2), 365 _CLK_SC_SELEC(RCC_MP_APB2ENSETR, 13, USART6_K, _UART6_SEL), 366 367 _CLK_SC_FIXED(RCC_MP_APB3ENSETR, 11, SYSCFG, _UNKNOWN_ID), 368 369 _CLK_SC_SELEC(RCC_MP_APB4ENSETR, 8, DDRPERFM, _UNKNOWN_SEL), 370 _CLK_SC_SELEC(RCC_MP_APB4ENSETR, 15, IWDG2, _UNKNOWN_SEL), 371 _CLK_SC_SELEC(RCC_MP_APB4ENSETR, 16, USBPHY_K, _USBPHY_SEL), 372 373 _CLK_SC_SELEC(RCC_MP_APB5ENSETR, 0, SPI6_K, _SPI6_SEL), 374 _CLK_SC_SELEC(RCC_MP_APB5ENSETR, 2, I2C4_K, _I2C46_SEL), 375 _CLK_SC_SELEC(RCC_MP_APB5ENSETR, 3, I2C6_K, _I2C46_SEL), 376 _CLK_SC_SELEC(RCC_MP_APB5ENSETR, 4, USART1_K, _UART1_SEL), 377 _CLK_SC_FIXED(RCC_MP_APB5ENSETR, 8, RTCAPB, _PCLK5), 378 _CLK_SC_FIXED(RCC_MP_APB5ENSETR, 11, TZC1, _PCLK5), 379 _CLK_SC_FIXED(RCC_MP_APB5ENSETR, 12, TZC2, _PCLK5), 380 _CLK_SC_FIXED(RCC_MP_APB5ENSETR, 13, TZPC, _PCLK5), 381 _CLK_SC_FIXED(RCC_MP_APB5ENSETR, 15, IWDG1, _PCLK5), 382 _CLK_SC_FIXED(RCC_MP_APB5ENSETR, 16, BSEC, _PCLK5), 383 _CLK_SC_SELEC(RCC_MP_APB5ENSETR, 20, STGEN_K, _STGEN_SEL), 384 385 _CLK_SC_SELEC(RCC_MP_AHB2ENSETR, 8, USBO_K, _USBO_SEL), 386 _CLK_SC_SELEC(RCC_MP_AHB2ENSETR, 16, SDMMC3_K, _SDMMC3_SEL), 387 388 _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 0, GPIOA, _UNKNOWN_SEL), 389 _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 1, GPIOB, _UNKNOWN_SEL), 390 _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 2, GPIOC, _UNKNOWN_SEL), 391 _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 3, GPIOD, _UNKNOWN_SEL), 392 _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 4, GPIOE, _UNKNOWN_SEL), 393 _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 5, GPIOF, _UNKNOWN_SEL), 394 _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 6, GPIOG, _UNKNOWN_SEL), 395 _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 7, GPIOH, _UNKNOWN_SEL), 396 _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 8, GPIOI, _UNKNOWN_SEL), 397 _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 9, GPIOJ, _UNKNOWN_SEL), 398 _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 10, GPIOK, _UNKNOWN_SEL), 399 400 _CLK_SC_FIXED(RCC_MP_AHB5ENSETR, 0, GPIOZ, _PCLK5), 401 _CLK_SC_FIXED(RCC_MP_AHB5ENSETR, 4, CRYP1, _PCLK5), 402 _CLK_SC_FIXED(RCC_MP_AHB5ENSETR, 5, HASH1, _PCLK5), 403 _CLK_SC_SELEC(RCC_MP_AHB5ENSETR, 6, RNG1_K, _RNG1_SEL), 404 _CLK_SC_FIXED(RCC_MP_AHB5ENSETR, 8, BKPSRAM, _PCLK5), 405 406 _CLK_SC_SELEC(RCC_MP_AHB6ENSETR, 12, FMC_K, _FMC_SEL), 407 _CLK_SC_SELEC(RCC_MP_AHB6ENSETR, 14, QSPI_K, _QSPI_SEL), 408 _CLK_SC_SELEC(RCC_MP_AHB6ENSETR, 16, SDMMC1_K, _SDMMC12_SEL), 409 _CLK_SC_SELEC(RCC_MP_AHB6ENSETR, 17, SDMMC2_K, _SDMMC12_SEL), 410 _CLK_SC_SELEC(RCC_MP_AHB6ENSETR, 24, USBH, _UNKNOWN_SEL), 411 412 _CLK_SELEC(RCC_BDCR, 20, RTC, _RTC_SEL), 413 _CLK_SELEC(RCC_DBGCFGR, 8, CK_DBG, _UNKNOWN_SEL), 414 }; 415 416 static const uint8_t i2c12_parents[] = { 417 _PCLK1, _PLL4_R, _HSI_KER, _CSI_KER 418 }; 419 420 static const uint8_t i2c35_parents[] = { 421 _PCLK1, _PLL4_R, _HSI_KER, _CSI_KER 422 }; 423 424 static const uint8_t stgen_parents[] = { 425 _HSI_KER, _HSE_KER 426 }; 427 428 static const uint8_t i2c46_parents[] = { 429 _PCLK5, _PLL3_Q, _HSI_KER, _CSI_KER 430 }; 431 432 static const uint8_t spi6_parents[] = { 433 _PCLK5, _PLL4_Q, _HSI_KER, _CSI_KER, _HSE_KER, _PLL3_Q 434 }; 435 436 static const uint8_t usart1_parents[] = { 437 _PCLK5, _PLL3_Q, _HSI_KER, _CSI_KER, _PLL4_Q, _HSE_KER 438 }; 439 440 static const uint8_t rng1_parents[] = { 441 _CSI, _PLL4_R, _LSE, _LSI 442 }; 443 444 static const uint8_t uart6_parents[] = { 445 _PCLK2, _PLL4_Q, _HSI_KER, _CSI_KER, _HSE_KER 446 }; 447 448 static const uint8_t uart234578_parents[] = { 449 _PCLK1, _PLL4_Q, _HSI_KER, _CSI_KER, _HSE_KER 450 }; 451 452 static const uint8_t sdmmc12_parents[] = { 453 _HCLK6, _PLL3_R, _PLL4_P, _HSI_KER 454 }; 455 456 static const uint8_t sdmmc3_parents[] = { 457 _HCLK2, _PLL3_R, _PLL4_P, _HSI_KER 458 }; 459 460 static const uint8_t qspi_parents[] = { 461 _ACLK, _PLL3_R, _PLL4_P, _CK_PER 462 }; 463 464 static const uint8_t fmc_parents[] = { 465 _ACLK, _PLL3_R, _PLL4_P, _CK_PER 466 }; 467 468 static const uint8_t ass_parents[] = { 469 _HSI, _HSE, _PLL2 470 }; 471 472 static const uint8_t mss_parents[] = { 473 _HSI, _HSE, _CSI, _PLL3 474 }; 475 476 static const uint8_t usbphy_parents[] = { 477 _HSE_KER, _PLL4_R, _HSE_KER_DIV2 478 }; 479 480 static const uint8_t usbo_parents[] = { 481 _PLL4_R, _USB_PHY_48 482 }; 483 484 static const uint8_t mpu_parents[] = { 485 _HSI, _HSE, _PLL1_P, _PLL1_P /* specific div */ 486 }; 487 488 static const uint8_t per_parents[] = { 489 _HSI, _HSE, _CSI, 490 }; 491 492 static const uint8_t rtc_parents[] = { 493 _UNKNOWN_ID, _LSE, _LSI, _HSE 494 }; 495 496 static const struct stm32mp1_clk_sel stm32mp1_clk_sel[_PARENT_SEL_NB] = { 497 _CLK_PARENT_SEL(I2C12, RCC_I2C12CKSELR, i2c12_parents), 498 _CLK_PARENT_SEL(I2C35, RCC_I2C35CKSELR, i2c35_parents), 499 _CLK_PARENT_SEL(STGEN, RCC_STGENCKSELR, stgen_parents), 500 _CLK_PARENT_SEL(I2C46, RCC_I2C46CKSELR, i2c46_parents), 501 _CLK_PARENT_SEL(SPI6, RCC_SPI6CKSELR, spi6_parents), 502 _CLK_PARENT_SEL(UART1, RCC_UART1CKSELR, usart1_parents), 503 _CLK_PARENT_SEL(RNG1, RCC_RNG1CKSELR, rng1_parents), 504 _CLK_PARENT_SEL(MPU, RCC_MPCKSELR, mpu_parents), 505 _CLK_PARENT_SEL(PER, RCC_CPERCKSELR, per_parents), 506 _CLK_PARENT_SEL(RTC, RCC_BDCR, rtc_parents), 507 _CLK_PARENT_SEL(UART6, RCC_UART6CKSELR, uart6_parents), 508 _CLK_PARENT_SEL(UART24, RCC_UART24CKSELR, uart234578_parents), 509 _CLK_PARENT_SEL(UART35, RCC_UART35CKSELR, uart234578_parents), 510 _CLK_PARENT_SEL(UART78, RCC_UART78CKSELR, uart234578_parents), 511 _CLK_PARENT_SEL(SDMMC12, RCC_SDMMC12CKSELR, sdmmc12_parents), 512 _CLK_PARENT_SEL(SDMMC3, RCC_SDMMC3CKSELR, sdmmc3_parents), 513 _CLK_PARENT_SEL(QSPI, RCC_QSPICKSELR, qspi_parents), 514 _CLK_PARENT_SEL(FMC, RCC_FMCCKSELR, fmc_parents), 515 _CLK_PARENT_SEL(AXIS, RCC_ASSCKSELR, ass_parents), 516 _CLK_PARENT_SEL(MCUS, RCC_MSSCKSELR, mss_parents), 517 _CLK_PARENT_SEL(USBPHY, RCC_USBCKSELR, usbphy_parents), 518 _CLK_PARENT_SEL(USBO, RCC_USBCKSELR, usbo_parents), 519 }; 520 521 /* Define characteristic of PLL according type */ 522 #define DIVN_MIN 24 523 static const struct stm32mp1_pll stm32mp1_pll[PLL_TYPE_NB] = { 524 [PLL_800] = { 525 .refclk_min = 4, 526 .refclk_max = 16, 527 .divn_max = 99, 528 }, 529 [PLL_1600] = { 530 .refclk_min = 8, 531 .refclk_max = 16, 532 .divn_max = 199, 533 }, 534 }; 535 536 /* PLLNCFGR2 register divider by output */ 537 static const uint8_t pllncfgr2[_DIV_NB] = { 538 [_DIV_P] = RCC_PLLNCFGR2_DIVP_SHIFT, 539 [_DIV_Q] = RCC_PLLNCFGR2_DIVQ_SHIFT, 540 [_DIV_R] = RCC_PLLNCFGR2_DIVR_SHIFT, 541 }; 542 543 static const struct stm32mp1_clk_pll stm32mp1_clk_pll[_PLL_NB] = { 544 _CLK_PLL(_PLL1, PLL_1600, 545 RCC_RCK12SELR, RCC_PLL1CFGR1, RCC_PLL1CFGR2, 546 RCC_PLL1FRACR, RCC_PLL1CR, RCC_PLL1CSGR, 547 _HSI, _HSE, _UNKNOWN_OSC_ID, _UNKNOWN_OSC_ID), 548 _CLK_PLL(_PLL2, PLL_1600, 549 RCC_RCK12SELR, RCC_PLL2CFGR1, RCC_PLL2CFGR2, 550 RCC_PLL2FRACR, RCC_PLL2CR, RCC_PLL2CSGR, 551 _HSI, _HSE, _UNKNOWN_OSC_ID, _UNKNOWN_OSC_ID), 552 _CLK_PLL(_PLL3, PLL_800, 553 RCC_RCK3SELR, RCC_PLL3CFGR1, RCC_PLL3CFGR2, 554 RCC_PLL3FRACR, RCC_PLL3CR, RCC_PLL3CSGR, 555 _HSI, _HSE, _CSI, _UNKNOWN_OSC_ID), 556 _CLK_PLL(_PLL4, PLL_800, 557 RCC_RCK4SELR, RCC_PLL4CFGR1, RCC_PLL4CFGR2, 558 RCC_PLL4FRACR, RCC_PLL4CR, RCC_PLL4CSGR, 559 _HSI, _HSE, _CSI, _I2S_CKIN), 560 }; 561 562 /* Prescaler table lookups for clock computation */ 563 /* div = /1 /2 /4 /8 / 16 /64 /128 /512 */ 564 static const uint8_t stm32mp1_mcu_div[16] = { 565 0, 1, 2, 3, 4, 6, 7, 8, 9, 9, 9, 9, 9, 9, 9, 9 566 }; 567 568 /* div = /1 /2 /4 /8 /16 : same divider for PMU and APBX */ 569 #define stm32mp1_mpu_div stm32mp1_mpu_apbx_div 570 #define stm32mp1_apbx_div stm32mp1_mpu_apbx_div 571 static const uint8_t stm32mp1_mpu_apbx_div[8] = { 572 0, 1, 2, 3, 4, 4, 4, 4 573 }; 574 575 /* div = /1 /2 /3 /4 */ 576 static const uint8_t stm32mp1_axi_div[8] = { 577 1, 2, 3, 4, 4, 4, 4, 4 578 }; 579 580 /* RCC clock device driver private */ 581 static unsigned long stm32mp1_osc[NB_OSC]; 582 static struct spinlock reg_lock; 583 static unsigned int gate_refcounts[NB_GATES]; 584 static struct spinlock refcount_lock; 585 586 static const struct stm32mp1_clk_gate *gate_ref(unsigned int idx) 587 { 588 return &stm32mp1_clk_gate[idx]; 589 } 590 591 static const struct stm32mp1_clk_sel *clk_sel_ref(unsigned int idx) 592 { 593 return &stm32mp1_clk_sel[idx]; 594 } 595 596 static const struct stm32mp1_clk_pll *pll_ref(unsigned int idx) 597 { 598 return &stm32mp1_clk_pll[idx]; 599 } 600 601 static void stm32mp1_clk_lock(struct spinlock *lock) 602 { 603 if (stm32mp_lock_available()) { 604 /* Assume interrupts are masked */ 605 spin_lock(lock); 606 } 607 } 608 609 static void stm32mp1_clk_unlock(struct spinlock *lock) 610 { 611 if (stm32mp_lock_available()) { 612 spin_unlock(lock); 613 } 614 } 615 616 bool stm32mp1_rcc_is_secure(void) 617 { 618 uintptr_t rcc_base = stm32mp_rcc_base(); 619 620 return (mmio_read_32(rcc_base + RCC_TZCR) & RCC_TZCR_TZEN) != 0; 621 } 622 623 bool stm32mp1_rcc_is_mckprot(void) 624 { 625 uintptr_t rcc_base = stm32mp_rcc_base(); 626 627 return (mmio_read_32(rcc_base + RCC_TZCR) & RCC_TZCR_MCKPROT) != 0; 628 } 629 630 void stm32mp1_clk_rcc_regs_lock(void) 631 { 632 stm32mp1_clk_lock(®_lock); 633 } 634 635 void stm32mp1_clk_rcc_regs_unlock(void) 636 { 637 stm32mp1_clk_unlock(®_lock); 638 } 639 640 static unsigned long stm32mp1_clk_get_fixed(enum stm32mp_osc_id idx) 641 { 642 if (idx >= NB_OSC) { 643 return 0; 644 } 645 646 return stm32mp1_osc[idx]; 647 } 648 649 static int stm32mp1_clk_get_gated_id(unsigned long id) 650 { 651 unsigned int i; 652 653 for (i = 0U; i < NB_GATES; i++) { 654 if (gate_ref(i)->index == id) { 655 return i; 656 } 657 } 658 659 ERROR("%s: clk id %d not found\n", __func__, (uint32_t)id); 660 661 return -EINVAL; 662 } 663 664 static enum stm32mp1_parent_sel stm32mp1_clk_get_sel(int i) 665 { 666 return (enum stm32mp1_parent_sel)(gate_ref(i)->sel); 667 } 668 669 static enum stm32mp1_parent_id stm32mp1_clk_get_fixed_parent(int i) 670 { 671 return (enum stm32mp1_parent_id)(gate_ref(i)->fixed); 672 } 673 674 static int stm32mp1_clk_get_parent(unsigned long id) 675 { 676 const struct stm32mp1_clk_sel *sel; 677 uint32_t p_sel; 678 int i; 679 enum stm32mp1_parent_id p; 680 enum stm32mp1_parent_sel s; 681 uintptr_t rcc_base = stm32mp_rcc_base(); 682 683 /* Few non gateable clock have a static parent ID, find them */ 684 i = (int)clock_id2parent_id(id); 685 if (i != _UNKNOWN_ID) { 686 return i; 687 } 688 689 i = stm32mp1_clk_get_gated_id(id); 690 if (i < 0) { 691 panic(); 692 } 693 694 p = stm32mp1_clk_get_fixed_parent(i); 695 if (p < _PARENT_NB) { 696 return (int)p; 697 } 698 699 s = stm32mp1_clk_get_sel(i); 700 if (s == _UNKNOWN_SEL) { 701 return -EINVAL; 702 } 703 if (s >= _PARENT_SEL_NB) { 704 panic(); 705 } 706 707 sel = clk_sel_ref(s); 708 p_sel = (mmio_read_32(rcc_base + sel->offset) & 709 (sel->msk << sel->src)) >> sel->src; 710 if (p_sel < sel->nb_parent) { 711 return (int)sel->parent[p_sel]; 712 } 713 714 return -EINVAL; 715 } 716 717 static unsigned long stm32mp1_pll_get_fref(const struct stm32mp1_clk_pll *pll) 718 { 719 uint32_t selr = mmio_read_32(stm32mp_rcc_base() + pll->rckxselr); 720 uint32_t src = selr & RCC_SELR_REFCLK_SRC_MASK; 721 722 return stm32mp1_clk_get_fixed(pll->refclk[src]); 723 } 724 725 /* 726 * pll_get_fvco() : return the VCO or (VCO / 2) frequency for the requested PLL 727 * - PLL1 & PLL2 => return VCO / 2 with Fpll_y_ck = FVCO / 2 * (DIVy + 1) 728 * - PLL3 & PLL4 => return VCO with Fpll_y_ck = FVCO / (DIVy + 1) 729 * => in all cases Fpll_y_ck = pll_get_fvco() / (DIVy + 1) 730 */ 731 static unsigned long stm32mp1_pll_get_fvco(const struct stm32mp1_clk_pll *pll) 732 { 733 unsigned long refclk, fvco; 734 uint32_t cfgr1, fracr, divm, divn; 735 uintptr_t rcc_base = stm32mp_rcc_base(); 736 737 cfgr1 = mmio_read_32(rcc_base + pll->pllxcfgr1); 738 fracr = mmio_read_32(rcc_base + pll->pllxfracr); 739 740 divm = (cfgr1 & (RCC_PLLNCFGR1_DIVM_MASK)) >> RCC_PLLNCFGR1_DIVM_SHIFT; 741 divn = cfgr1 & RCC_PLLNCFGR1_DIVN_MASK; 742 743 refclk = stm32mp1_pll_get_fref(pll); 744 745 /* 746 * With FRACV : 747 * Fvco = Fck_ref * ((DIVN + 1) + FRACV / 2^13) / (DIVM + 1) 748 * Without FRACV 749 * Fvco = Fck_ref * ((DIVN + 1) / (DIVM + 1) 750 */ 751 if ((fracr & RCC_PLLNFRACR_FRACLE) != 0U) { 752 uint32_t fracv = (fracr & RCC_PLLNFRACR_FRACV_MASK) >> 753 RCC_PLLNFRACR_FRACV_SHIFT; 754 unsigned long long numerator, denominator; 755 756 numerator = (((unsigned long long)divn + 1U) << 13) + fracv; 757 numerator = refclk * numerator; 758 denominator = ((unsigned long long)divm + 1U) << 13; 759 fvco = (unsigned long)(numerator / denominator); 760 } else { 761 fvco = (unsigned long)(refclk * (divn + 1U) / (divm + 1U)); 762 } 763 764 return fvco; 765 } 766 767 static unsigned long stm32mp1_read_pll_freq(enum stm32mp1_pll_id pll_id, 768 enum stm32mp1_div_id div_id) 769 { 770 const struct stm32mp1_clk_pll *pll = pll_ref(pll_id); 771 unsigned long dfout; 772 uint32_t cfgr2, divy; 773 774 if (div_id >= _DIV_NB) { 775 return 0; 776 } 777 778 cfgr2 = mmio_read_32(stm32mp_rcc_base() + pll->pllxcfgr2); 779 divy = (cfgr2 >> pllncfgr2[div_id]) & RCC_PLLNCFGR2_DIVX_MASK; 780 781 dfout = stm32mp1_pll_get_fvco(pll) / (divy + 1U); 782 783 return dfout; 784 } 785 786 static unsigned long get_clock_rate(int p) 787 { 788 uint32_t reg, clkdiv; 789 unsigned long clock = 0; 790 uintptr_t rcc_base = stm32mp_rcc_base(); 791 792 switch (p) { 793 case _CK_MPU: 794 /* MPU sub system */ 795 reg = mmio_read_32(rcc_base + RCC_MPCKSELR); 796 switch (reg & RCC_SELR_SRC_MASK) { 797 case RCC_MPCKSELR_HSI: 798 clock = stm32mp1_clk_get_fixed(_HSI); 799 break; 800 case RCC_MPCKSELR_HSE: 801 clock = stm32mp1_clk_get_fixed(_HSE); 802 break; 803 case RCC_MPCKSELR_PLL: 804 clock = stm32mp1_read_pll_freq(_PLL1, _DIV_P); 805 break; 806 case RCC_MPCKSELR_PLL_MPUDIV: 807 clock = stm32mp1_read_pll_freq(_PLL1, _DIV_P); 808 809 reg = mmio_read_32(rcc_base + RCC_MPCKDIVR); 810 clkdiv = reg & RCC_MPUDIV_MASK; 811 if (clkdiv != 0U) { 812 clock /= stm32mp1_mpu_div[clkdiv]; 813 } 814 break; 815 default: 816 break; 817 } 818 break; 819 /* AXI sub system */ 820 case _ACLK: 821 case _HCLK2: 822 case _HCLK6: 823 case _PCLK4: 824 case _PCLK5: 825 reg = mmio_read_32(rcc_base + RCC_ASSCKSELR); 826 switch (reg & RCC_SELR_SRC_MASK) { 827 case RCC_ASSCKSELR_HSI: 828 clock = stm32mp1_clk_get_fixed(_HSI); 829 break; 830 case RCC_ASSCKSELR_HSE: 831 clock = stm32mp1_clk_get_fixed(_HSE); 832 break; 833 case RCC_ASSCKSELR_PLL: 834 clock = stm32mp1_read_pll_freq(_PLL2, _DIV_P); 835 break; 836 default: 837 break; 838 } 839 840 /* System clock divider */ 841 reg = mmio_read_32(rcc_base + RCC_AXIDIVR); 842 clock /= stm32mp1_axi_div[reg & RCC_AXIDIV_MASK]; 843 844 switch (p) { 845 case _PCLK4: 846 reg = mmio_read_32(rcc_base + RCC_APB4DIVR); 847 clock >>= stm32mp1_apbx_div[reg & RCC_APBXDIV_MASK]; 848 break; 849 case _PCLK5: 850 reg = mmio_read_32(rcc_base + RCC_APB5DIVR); 851 clock >>= stm32mp1_apbx_div[reg & RCC_APBXDIV_MASK]; 852 break; 853 default: 854 break; 855 } 856 break; 857 /* MCU sub system */ 858 case _CK_MCU: 859 case _PCLK1: 860 case _PCLK2: 861 case _PCLK3: 862 reg = mmio_read_32(rcc_base + RCC_MSSCKSELR); 863 switch (reg & RCC_SELR_SRC_MASK) { 864 case RCC_MSSCKSELR_HSI: 865 clock = stm32mp1_clk_get_fixed(_HSI); 866 break; 867 case RCC_MSSCKSELR_HSE: 868 clock = stm32mp1_clk_get_fixed(_HSE); 869 break; 870 case RCC_MSSCKSELR_CSI: 871 clock = stm32mp1_clk_get_fixed(_CSI); 872 break; 873 case RCC_MSSCKSELR_PLL: 874 clock = stm32mp1_read_pll_freq(_PLL3, _DIV_P); 875 break; 876 default: 877 break; 878 } 879 880 /* MCU clock divider */ 881 reg = mmio_read_32(rcc_base + RCC_MCUDIVR); 882 clock >>= stm32mp1_mcu_div[reg & RCC_MCUDIV_MASK]; 883 884 switch (p) { 885 case _PCLK1: 886 reg = mmio_read_32(rcc_base + RCC_APB1DIVR); 887 clock >>= stm32mp1_apbx_div[reg & RCC_APBXDIV_MASK]; 888 break; 889 case _PCLK2: 890 reg = mmio_read_32(rcc_base + RCC_APB2DIVR); 891 clock >>= stm32mp1_apbx_div[reg & RCC_APBXDIV_MASK]; 892 break; 893 case _PCLK3: 894 reg = mmio_read_32(rcc_base + RCC_APB3DIVR); 895 clock >>= stm32mp1_apbx_div[reg & RCC_APBXDIV_MASK]; 896 break; 897 case _CK_MCU: 898 default: 899 break; 900 } 901 break; 902 case _CK_PER: 903 reg = mmio_read_32(rcc_base + RCC_CPERCKSELR); 904 switch (reg & RCC_SELR_SRC_MASK) { 905 case RCC_CPERCKSELR_HSI: 906 clock = stm32mp1_clk_get_fixed(_HSI); 907 break; 908 case RCC_CPERCKSELR_HSE: 909 clock = stm32mp1_clk_get_fixed(_HSE); 910 break; 911 case RCC_CPERCKSELR_CSI: 912 clock = stm32mp1_clk_get_fixed(_CSI); 913 break; 914 default: 915 break; 916 } 917 break; 918 case _HSI: 919 case _HSI_KER: 920 clock = stm32mp1_clk_get_fixed(_HSI); 921 break; 922 case _CSI: 923 case _CSI_KER: 924 clock = stm32mp1_clk_get_fixed(_CSI); 925 break; 926 case _HSE: 927 case _HSE_KER: 928 clock = stm32mp1_clk_get_fixed(_HSE); 929 break; 930 case _HSE_KER_DIV2: 931 clock = stm32mp1_clk_get_fixed(_HSE) >> 1; 932 break; 933 case _LSI: 934 clock = stm32mp1_clk_get_fixed(_LSI); 935 break; 936 case _LSE: 937 clock = stm32mp1_clk_get_fixed(_LSE); 938 break; 939 /* PLL */ 940 case _PLL1_P: 941 clock = stm32mp1_read_pll_freq(_PLL1, _DIV_P); 942 break; 943 case _PLL1_Q: 944 clock = stm32mp1_read_pll_freq(_PLL1, _DIV_Q); 945 break; 946 case _PLL1_R: 947 clock = stm32mp1_read_pll_freq(_PLL1, _DIV_R); 948 break; 949 case _PLL2_P: 950 clock = stm32mp1_read_pll_freq(_PLL2, _DIV_P); 951 break; 952 case _PLL2_Q: 953 clock = stm32mp1_read_pll_freq(_PLL2, _DIV_Q); 954 break; 955 case _PLL2_R: 956 clock = stm32mp1_read_pll_freq(_PLL2, _DIV_R); 957 break; 958 case _PLL3_P: 959 clock = stm32mp1_read_pll_freq(_PLL3, _DIV_P); 960 break; 961 case _PLL3_Q: 962 clock = stm32mp1_read_pll_freq(_PLL3, _DIV_Q); 963 break; 964 case _PLL3_R: 965 clock = stm32mp1_read_pll_freq(_PLL3, _DIV_R); 966 break; 967 case _PLL4_P: 968 clock = stm32mp1_read_pll_freq(_PLL4, _DIV_P); 969 break; 970 case _PLL4_Q: 971 clock = stm32mp1_read_pll_freq(_PLL4, _DIV_Q); 972 break; 973 case _PLL4_R: 974 clock = stm32mp1_read_pll_freq(_PLL4, _DIV_R); 975 break; 976 /* Other */ 977 case _USB_PHY_48: 978 clock = USB_PHY_48_MHZ; 979 break; 980 default: 981 break; 982 } 983 984 return clock; 985 } 986 987 static void __clk_enable(struct stm32mp1_clk_gate const *gate) 988 { 989 uintptr_t rcc_base = stm32mp_rcc_base(); 990 991 if (gate->set_clr != 0U) { 992 mmio_write_32(rcc_base + gate->offset, BIT(gate->bit)); 993 } else { 994 mmio_setbits_32(rcc_base + gate->offset, BIT(gate->bit)); 995 } 996 997 VERBOSE("Clock %d has been enabled", gate->index); 998 } 999 1000 static void __clk_disable(struct stm32mp1_clk_gate const *gate) 1001 { 1002 uintptr_t rcc_base = stm32mp_rcc_base(); 1003 1004 if (gate->set_clr != 0U) { 1005 mmio_write_32(rcc_base + gate->offset + RCC_MP_ENCLRR_OFFSET, 1006 BIT(gate->bit)); 1007 } else { 1008 mmio_clrbits_32(rcc_base + gate->offset, BIT(gate->bit)); 1009 } 1010 1011 VERBOSE("Clock %d has been disabled", gate->index); 1012 } 1013 1014 static bool __clk_is_enabled(struct stm32mp1_clk_gate const *gate) 1015 { 1016 uintptr_t rcc_base = stm32mp_rcc_base(); 1017 1018 return mmio_read_32(rcc_base + gate->offset) & BIT(gate->bit); 1019 } 1020 1021 unsigned int stm32mp1_clk_get_refcount(unsigned long id) 1022 { 1023 int i = stm32mp1_clk_get_gated_id(id); 1024 1025 if (i < 0) { 1026 panic(); 1027 } 1028 1029 return gate_refcounts[i]; 1030 } 1031 1032 void __stm32mp1_clk_enable(unsigned long id, bool secure) 1033 { 1034 const struct stm32mp1_clk_gate *gate; 1035 int i = stm32mp1_clk_get_gated_id(id); 1036 unsigned int *refcnt; 1037 1038 if (i < 0) { 1039 ERROR("Clock %d can't be enabled\n", (uint32_t)id); 1040 panic(); 1041 } 1042 1043 gate = gate_ref(i); 1044 refcnt = &gate_refcounts[i]; 1045 1046 stm32mp1_clk_lock(&refcount_lock); 1047 1048 if (stm32mp_incr_shrefcnt(refcnt, secure) != 0) { 1049 __clk_enable(gate); 1050 } 1051 1052 stm32mp1_clk_unlock(&refcount_lock); 1053 } 1054 1055 void __stm32mp1_clk_disable(unsigned long id, bool secure) 1056 { 1057 const struct stm32mp1_clk_gate *gate; 1058 int i = stm32mp1_clk_get_gated_id(id); 1059 unsigned int *refcnt; 1060 1061 if (i < 0) { 1062 ERROR("Clock %d can't be disabled\n", (uint32_t)id); 1063 panic(); 1064 } 1065 1066 gate = gate_ref(i); 1067 refcnt = &gate_refcounts[i]; 1068 1069 stm32mp1_clk_lock(&refcount_lock); 1070 1071 if (stm32mp_decr_shrefcnt(refcnt, secure) != 0) { 1072 __clk_disable(gate); 1073 } 1074 1075 stm32mp1_clk_unlock(&refcount_lock); 1076 } 1077 1078 void stm32mp_clk_enable(unsigned long id) 1079 { 1080 __stm32mp1_clk_enable(id, true); 1081 } 1082 1083 void stm32mp_clk_disable(unsigned long id) 1084 { 1085 __stm32mp1_clk_disable(id, true); 1086 } 1087 1088 bool stm32mp_clk_is_enabled(unsigned long id) 1089 { 1090 int i = stm32mp1_clk_get_gated_id(id); 1091 1092 if (i < 0) { 1093 panic(); 1094 } 1095 1096 return __clk_is_enabled(gate_ref(i)); 1097 } 1098 1099 unsigned long stm32mp_clk_get_rate(unsigned long id) 1100 { 1101 int p = stm32mp1_clk_get_parent(id); 1102 1103 if (p < 0) { 1104 return 0; 1105 } 1106 1107 return get_clock_rate(p); 1108 } 1109 1110 static void stm32mp1_ls_osc_set(bool enable, uint32_t offset, uint32_t mask_on) 1111 { 1112 uintptr_t address = stm32mp_rcc_base() + offset; 1113 1114 if (enable) { 1115 mmio_setbits_32(address, mask_on); 1116 } else { 1117 mmio_clrbits_32(address, mask_on); 1118 } 1119 } 1120 1121 static void stm32mp1_hs_ocs_set(bool enable, uint32_t mask_on) 1122 { 1123 uint32_t offset = enable ? RCC_OCENSETR : RCC_OCENCLRR; 1124 uintptr_t address = stm32mp_rcc_base() + offset; 1125 1126 mmio_write_32(address, mask_on); 1127 } 1128 1129 static int stm32mp1_osc_wait(bool enable, uint32_t offset, uint32_t mask_rdy) 1130 { 1131 uint64_t timeout; 1132 uint32_t mask_test; 1133 uintptr_t address = stm32mp_rcc_base() + offset; 1134 1135 if (enable) { 1136 mask_test = mask_rdy; 1137 } else { 1138 mask_test = 0; 1139 } 1140 1141 timeout = timeout_init_us(OSCRDY_TIMEOUT); 1142 while ((mmio_read_32(address) & mask_rdy) != mask_test) { 1143 if (timeout_elapsed(timeout)) { 1144 ERROR("OSC %x @ %lx timeout for enable=%d : 0x%x\n", 1145 mask_rdy, address, enable, mmio_read_32(address)); 1146 return -ETIMEDOUT; 1147 } 1148 } 1149 1150 return 0; 1151 } 1152 1153 static void stm32mp1_lse_enable(bool bypass, bool digbyp, uint32_t lsedrv) 1154 { 1155 uint32_t value; 1156 uintptr_t rcc_base = stm32mp_rcc_base(); 1157 1158 if (digbyp) { 1159 mmio_setbits_32(rcc_base + RCC_BDCR, RCC_BDCR_DIGBYP); 1160 } 1161 1162 if (bypass || digbyp) { 1163 mmio_setbits_32(rcc_base + RCC_BDCR, RCC_BDCR_LSEBYP); 1164 } 1165 1166 /* 1167 * Warning: not recommended to switch directly from "high drive" 1168 * to "medium low drive", and vice-versa. 1169 */ 1170 value = (mmio_read_32(rcc_base + RCC_BDCR) & RCC_BDCR_LSEDRV_MASK) >> 1171 RCC_BDCR_LSEDRV_SHIFT; 1172 1173 while (value != lsedrv) { 1174 if (value > lsedrv) { 1175 value--; 1176 } else { 1177 value++; 1178 } 1179 1180 mmio_clrsetbits_32(rcc_base + RCC_BDCR, 1181 RCC_BDCR_LSEDRV_MASK, 1182 value << RCC_BDCR_LSEDRV_SHIFT); 1183 } 1184 1185 stm32mp1_ls_osc_set(true, RCC_BDCR, RCC_BDCR_LSEON); 1186 } 1187 1188 static void stm32mp1_lse_wait(void) 1189 { 1190 if (stm32mp1_osc_wait(true, RCC_BDCR, RCC_BDCR_LSERDY) != 0) { 1191 VERBOSE("%s: failed\n", __func__); 1192 } 1193 } 1194 1195 static void stm32mp1_lsi_set(bool enable) 1196 { 1197 stm32mp1_ls_osc_set(enable, RCC_RDLSICR, RCC_RDLSICR_LSION); 1198 1199 if (stm32mp1_osc_wait(enable, RCC_RDLSICR, RCC_RDLSICR_LSIRDY) != 0) { 1200 VERBOSE("%s: failed\n", __func__); 1201 } 1202 } 1203 1204 static void stm32mp1_hse_enable(bool bypass, bool digbyp, bool css) 1205 { 1206 uintptr_t rcc_base = stm32mp_rcc_base(); 1207 1208 if (digbyp) { 1209 mmio_write_32(rcc_base + RCC_OCENSETR, RCC_OCENR_DIGBYP); 1210 } 1211 1212 if (bypass || digbyp) { 1213 mmio_write_32(rcc_base + RCC_OCENSETR, RCC_OCENR_HSEBYP); 1214 } 1215 1216 stm32mp1_hs_ocs_set(true, RCC_OCENR_HSEON); 1217 if (stm32mp1_osc_wait(true, RCC_OCRDYR, RCC_OCRDYR_HSERDY) != 0) { 1218 VERBOSE("%s: failed\n", __func__); 1219 } 1220 1221 if (css) { 1222 mmio_write_32(rcc_base + RCC_OCENSETR, RCC_OCENR_HSECSSON); 1223 } 1224 } 1225 1226 static void stm32mp1_csi_set(bool enable) 1227 { 1228 stm32mp1_hs_ocs_set(enable, RCC_OCENR_CSION); 1229 if (stm32mp1_osc_wait(enable, RCC_OCRDYR, RCC_OCRDYR_CSIRDY) != 0) { 1230 VERBOSE("%s: failed\n", __func__); 1231 } 1232 } 1233 1234 static void stm32mp1_hsi_set(bool enable) 1235 { 1236 stm32mp1_hs_ocs_set(enable, RCC_OCENR_HSION); 1237 if (stm32mp1_osc_wait(enable, RCC_OCRDYR, RCC_OCRDYR_HSIRDY) != 0) { 1238 VERBOSE("%s: failed\n", __func__); 1239 } 1240 } 1241 1242 static int stm32mp1_set_hsidiv(uint8_t hsidiv) 1243 { 1244 uint64_t timeout; 1245 uintptr_t rcc_base = stm32mp_rcc_base(); 1246 uintptr_t address = rcc_base + RCC_OCRDYR; 1247 1248 mmio_clrsetbits_32(rcc_base + RCC_HSICFGR, 1249 RCC_HSICFGR_HSIDIV_MASK, 1250 RCC_HSICFGR_HSIDIV_MASK & (uint32_t)hsidiv); 1251 1252 timeout = timeout_init_us(HSIDIV_TIMEOUT); 1253 while ((mmio_read_32(address) & RCC_OCRDYR_HSIDIVRDY) == 0U) { 1254 if (timeout_elapsed(timeout)) { 1255 ERROR("HSIDIV failed @ 0x%lx: 0x%x\n", 1256 address, mmio_read_32(address)); 1257 return -ETIMEDOUT; 1258 } 1259 } 1260 1261 return 0; 1262 } 1263 1264 static int stm32mp1_hsidiv(unsigned long hsifreq) 1265 { 1266 uint8_t hsidiv; 1267 uint32_t hsidivfreq = MAX_HSI_HZ; 1268 1269 for (hsidiv = 0; hsidiv < 4U; hsidiv++) { 1270 if (hsidivfreq == hsifreq) { 1271 break; 1272 } 1273 1274 hsidivfreq /= 2U; 1275 } 1276 1277 if (hsidiv == 4U) { 1278 ERROR("Invalid clk-hsi frequency\n"); 1279 return -1; 1280 } 1281 1282 if (hsidiv != 0U) { 1283 return stm32mp1_set_hsidiv(hsidiv); 1284 } 1285 1286 return 0; 1287 } 1288 1289 static bool stm32mp1_check_pll_conf(enum stm32mp1_pll_id pll_id, 1290 unsigned int clksrc, 1291 uint32_t *pllcfg, int plloff) 1292 { 1293 const struct stm32mp1_clk_pll *pll = pll_ref(pll_id); 1294 uintptr_t rcc_base = stm32mp_rcc_base(); 1295 uintptr_t pllxcr = rcc_base + pll->pllxcr; 1296 enum stm32mp1_plltype type = pll->plltype; 1297 uintptr_t clksrc_address = rcc_base + (clksrc >> 4); 1298 unsigned long refclk; 1299 uint32_t ifrge = 0U; 1300 uint32_t src, value, fracv = 0; 1301 void *fdt; 1302 1303 /* Check PLL output */ 1304 if (mmio_read_32(pllxcr) != RCC_PLLNCR_PLLON) { 1305 return false; 1306 } 1307 1308 /* Check current clksrc */ 1309 src = mmio_read_32(clksrc_address) & RCC_SELR_SRC_MASK; 1310 if (src != (clksrc & RCC_SELR_SRC_MASK)) { 1311 return false; 1312 } 1313 1314 /* Check Div */ 1315 src = mmio_read_32(rcc_base + pll->rckxselr) & RCC_SELR_REFCLK_SRC_MASK; 1316 1317 refclk = stm32mp1_clk_get_fixed(pll->refclk[src]) / 1318 (pllcfg[PLLCFG_M] + 1U); 1319 1320 if ((refclk < (stm32mp1_pll[type].refclk_min * 1000000U)) || 1321 (refclk > (stm32mp1_pll[type].refclk_max * 1000000U))) { 1322 return false; 1323 } 1324 1325 if ((type == PLL_800) && (refclk >= 8000000U)) { 1326 ifrge = 1U; 1327 } 1328 1329 value = (pllcfg[PLLCFG_N] << RCC_PLLNCFGR1_DIVN_SHIFT) & 1330 RCC_PLLNCFGR1_DIVN_MASK; 1331 value |= (pllcfg[PLLCFG_M] << RCC_PLLNCFGR1_DIVM_SHIFT) & 1332 RCC_PLLNCFGR1_DIVM_MASK; 1333 value |= (ifrge << RCC_PLLNCFGR1_IFRGE_SHIFT) & 1334 RCC_PLLNCFGR1_IFRGE_MASK; 1335 if (mmio_read_32(rcc_base + pll->pllxcfgr1) != value) { 1336 return false; 1337 } 1338 1339 /* Fractional configuration */ 1340 if (fdt_get_address(&fdt) == 1) { 1341 fracv = fdt_read_uint32_default(fdt, plloff, "frac", 0); 1342 } 1343 1344 value = fracv << RCC_PLLNFRACR_FRACV_SHIFT; 1345 value |= RCC_PLLNFRACR_FRACLE; 1346 if (mmio_read_32(rcc_base + pll->pllxfracr) != value) { 1347 return false; 1348 } 1349 1350 /* Output config */ 1351 value = (pllcfg[PLLCFG_P] << RCC_PLLNCFGR2_DIVP_SHIFT) & 1352 RCC_PLLNCFGR2_DIVP_MASK; 1353 value |= (pllcfg[PLLCFG_Q] << RCC_PLLNCFGR2_DIVQ_SHIFT) & 1354 RCC_PLLNCFGR2_DIVQ_MASK; 1355 value |= (pllcfg[PLLCFG_R] << RCC_PLLNCFGR2_DIVR_SHIFT) & 1356 RCC_PLLNCFGR2_DIVR_MASK; 1357 if (mmio_read_32(rcc_base + pll->pllxcfgr2) != value) { 1358 return false; 1359 } 1360 1361 return true; 1362 } 1363 1364 static void stm32mp1_pll_start(enum stm32mp1_pll_id pll_id) 1365 { 1366 const struct stm32mp1_clk_pll *pll = pll_ref(pll_id); 1367 uintptr_t pllxcr = stm32mp_rcc_base() + pll->pllxcr; 1368 1369 /* Preserve RCC_PLLNCR_SSCG_CTRL value */ 1370 mmio_clrsetbits_32(pllxcr, 1371 RCC_PLLNCR_DIVPEN | RCC_PLLNCR_DIVQEN | 1372 RCC_PLLNCR_DIVREN, 1373 RCC_PLLNCR_PLLON); 1374 } 1375 1376 static int stm32mp1_pll_output(enum stm32mp1_pll_id pll_id, uint32_t output) 1377 { 1378 const struct stm32mp1_clk_pll *pll = pll_ref(pll_id); 1379 uintptr_t pllxcr = stm32mp_rcc_base() + pll->pllxcr; 1380 uint64_t timeout = timeout_init_us(PLLRDY_TIMEOUT); 1381 1382 /* Wait PLL lock */ 1383 while ((mmio_read_32(pllxcr) & RCC_PLLNCR_PLLRDY) == 0U) { 1384 if (timeout_elapsed(timeout)) { 1385 ERROR("PLL%d start failed @ 0x%lx: 0x%x\n", 1386 pll_id, pllxcr, mmio_read_32(pllxcr)); 1387 return -ETIMEDOUT; 1388 } 1389 } 1390 1391 /* Start the requested output */ 1392 mmio_setbits_32(pllxcr, output << RCC_PLLNCR_DIVEN_SHIFT); 1393 1394 return 0; 1395 } 1396 1397 static int stm32mp1_pll_stop(enum stm32mp1_pll_id pll_id) 1398 { 1399 const struct stm32mp1_clk_pll *pll = pll_ref(pll_id); 1400 uintptr_t pllxcr = stm32mp_rcc_base() + pll->pllxcr; 1401 uint64_t timeout; 1402 1403 /* Stop all output */ 1404 mmio_clrbits_32(pllxcr, RCC_PLLNCR_DIVPEN | RCC_PLLNCR_DIVQEN | 1405 RCC_PLLNCR_DIVREN); 1406 1407 /* Stop PLL */ 1408 mmio_clrbits_32(pllxcr, RCC_PLLNCR_PLLON); 1409 1410 timeout = timeout_init_us(PLLRDY_TIMEOUT); 1411 /* Wait PLL stopped */ 1412 while ((mmio_read_32(pllxcr) & RCC_PLLNCR_PLLRDY) != 0U) { 1413 if (timeout_elapsed(timeout)) { 1414 ERROR("PLL%d stop failed @ 0x%lx: 0x%x\n", 1415 pll_id, pllxcr, mmio_read_32(pllxcr)); 1416 return -ETIMEDOUT; 1417 } 1418 } 1419 1420 return 0; 1421 } 1422 1423 static void stm32mp1_pll_config_output(enum stm32mp1_pll_id pll_id, 1424 uint32_t *pllcfg) 1425 { 1426 const struct stm32mp1_clk_pll *pll = pll_ref(pll_id); 1427 uintptr_t rcc_base = stm32mp_rcc_base(); 1428 uint32_t value; 1429 1430 value = (pllcfg[PLLCFG_P] << RCC_PLLNCFGR2_DIVP_SHIFT) & 1431 RCC_PLLNCFGR2_DIVP_MASK; 1432 value |= (pllcfg[PLLCFG_Q] << RCC_PLLNCFGR2_DIVQ_SHIFT) & 1433 RCC_PLLNCFGR2_DIVQ_MASK; 1434 value |= (pllcfg[PLLCFG_R] << RCC_PLLNCFGR2_DIVR_SHIFT) & 1435 RCC_PLLNCFGR2_DIVR_MASK; 1436 mmio_write_32(rcc_base + pll->pllxcfgr2, value); 1437 } 1438 1439 static int stm32mp1_pll_config(enum stm32mp1_pll_id pll_id, 1440 uint32_t *pllcfg, uint32_t fracv) 1441 { 1442 const struct stm32mp1_clk_pll *pll = pll_ref(pll_id); 1443 uintptr_t rcc_base = stm32mp_rcc_base(); 1444 enum stm32mp1_plltype type = pll->plltype; 1445 unsigned long refclk; 1446 uint32_t ifrge = 0; 1447 uint32_t src, value; 1448 1449 src = mmio_read_32(rcc_base + pll->rckxselr) & 1450 RCC_SELR_REFCLK_SRC_MASK; 1451 1452 refclk = stm32mp1_clk_get_fixed(pll->refclk[src]) / 1453 (pllcfg[PLLCFG_M] + 1U); 1454 1455 if ((refclk < (stm32mp1_pll[type].refclk_min * 1000000U)) || 1456 (refclk > (stm32mp1_pll[type].refclk_max * 1000000U))) { 1457 return -EINVAL; 1458 } 1459 1460 if ((type == PLL_800) && (refclk >= 8000000U)) { 1461 ifrge = 1U; 1462 } 1463 1464 value = (pllcfg[PLLCFG_N] << RCC_PLLNCFGR1_DIVN_SHIFT) & 1465 RCC_PLLNCFGR1_DIVN_MASK; 1466 value |= (pllcfg[PLLCFG_M] << RCC_PLLNCFGR1_DIVM_SHIFT) & 1467 RCC_PLLNCFGR1_DIVM_MASK; 1468 value |= (ifrge << RCC_PLLNCFGR1_IFRGE_SHIFT) & 1469 RCC_PLLNCFGR1_IFRGE_MASK; 1470 mmio_write_32(rcc_base + pll->pllxcfgr1, value); 1471 1472 /* Fractional configuration */ 1473 value = 0; 1474 mmio_write_32(rcc_base + pll->pllxfracr, value); 1475 1476 value = fracv << RCC_PLLNFRACR_FRACV_SHIFT; 1477 mmio_write_32(rcc_base + pll->pllxfracr, value); 1478 1479 value |= RCC_PLLNFRACR_FRACLE; 1480 mmio_write_32(rcc_base + pll->pllxfracr, value); 1481 1482 stm32mp1_pll_config_output(pll_id, pllcfg); 1483 1484 return 0; 1485 } 1486 1487 static void stm32mp1_pll_csg(enum stm32mp1_pll_id pll_id, uint32_t *csg) 1488 { 1489 const struct stm32mp1_clk_pll *pll = pll_ref(pll_id); 1490 uint32_t pllxcsg = 0; 1491 1492 pllxcsg |= (csg[PLLCSG_MOD_PER] << RCC_PLLNCSGR_MOD_PER_SHIFT) & 1493 RCC_PLLNCSGR_MOD_PER_MASK; 1494 1495 pllxcsg |= (csg[PLLCSG_INC_STEP] << RCC_PLLNCSGR_INC_STEP_SHIFT) & 1496 RCC_PLLNCSGR_INC_STEP_MASK; 1497 1498 pllxcsg |= (csg[PLLCSG_SSCG_MODE] << RCC_PLLNCSGR_SSCG_MODE_SHIFT) & 1499 RCC_PLLNCSGR_SSCG_MODE_MASK; 1500 1501 mmio_write_32(stm32mp_rcc_base() + pll->pllxcsgr, pllxcsg); 1502 1503 mmio_setbits_32(stm32mp_rcc_base() + pll->pllxcr, 1504 RCC_PLLNCR_SSCG_CTRL); 1505 } 1506 1507 static int stm32mp1_set_clksrc(unsigned int clksrc) 1508 { 1509 uintptr_t clksrc_address = stm32mp_rcc_base() + (clksrc >> 4); 1510 uint64_t timeout; 1511 1512 mmio_clrsetbits_32(clksrc_address, RCC_SELR_SRC_MASK, 1513 clksrc & RCC_SELR_SRC_MASK); 1514 1515 timeout = timeout_init_us(CLKSRC_TIMEOUT); 1516 while ((mmio_read_32(clksrc_address) & RCC_SELR_SRCRDY) == 0U) { 1517 if (timeout_elapsed(timeout)) { 1518 ERROR("CLKSRC %x start failed @ 0x%lx: 0x%x\n", clksrc, 1519 clksrc_address, mmio_read_32(clksrc_address)); 1520 return -ETIMEDOUT; 1521 } 1522 } 1523 1524 return 0; 1525 } 1526 1527 static int stm32mp1_set_clkdiv(unsigned int clkdiv, uintptr_t address) 1528 { 1529 uint64_t timeout; 1530 1531 mmio_clrsetbits_32(address, RCC_DIVR_DIV_MASK, 1532 clkdiv & RCC_DIVR_DIV_MASK); 1533 1534 timeout = timeout_init_us(CLKDIV_TIMEOUT); 1535 while ((mmio_read_32(address) & RCC_DIVR_DIVRDY) == 0U) { 1536 if (timeout_elapsed(timeout)) { 1537 ERROR("CLKDIV %x start failed @ 0x%lx: 0x%x\n", 1538 clkdiv, address, mmio_read_32(address)); 1539 return -ETIMEDOUT; 1540 } 1541 } 1542 1543 return 0; 1544 } 1545 1546 static void stm32mp1_mco_csg(uint32_t clksrc, uint32_t clkdiv) 1547 { 1548 uintptr_t clksrc_address = stm32mp_rcc_base() + (clksrc >> 4); 1549 1550 /* 1551 * Binding clksrc : 1552 * bit15-4 offset 1553 * bit3: disable 1554 * bit2-0: MCOSEL[2:0] 1555 */ 1556 if ((clksrc & 0x8U) != 0U) { 1557 mmio_clrbits_32(clksrc_address, RCC_MCOCFG_MCOON); 1558 } else { 1559 mmio_clrsetbits_32(clksrc_address, 1560 RCC_MCOCFG_MCOSRC_MASK, 1561 clksrc & RCC_MCOCFG_MCOSRC_MASK); 1562 mmio_clrsetbits_32(clksrc_address, 1563 RCC_MCOCFG_MCODIV_MASK, 1564 clkdiv << RCC_MCOCFG_MCODIV_SHIFT); 1565 mmio_setbits_32(clksrc_address, RCC_MCOCFG_MCOON); 1566 } 1567 } 1568 1569 static void stm32mp1_set_rtcsrc(unsigned int clksrc, bool lse_css) 1570 { 1571 uintptr_t address = stm32mp_rcc_base() + RCC_BDCR; 1572 1573 if (((mmio_read_32(address) & RCC_BDCR_RTCCKEN) == 0U) || 1574 (clksrc != (uint32_t)CLK_RTC_DISABLED)) { 1575 mmio_clrsetbits_32(address, 1576 RCC_BDCR_RTCSRC_MASK, 1577 clksrc << RCC_BDCR_RTCSRC_SHIFT); 1578 1579 mmio_setbits_32(address, RCC_BDCR_RTCCKEN); 1580 } 1581 1582 if (lse_css) { 1583 mmio_setbits_32(address, RCC_BDCR_LSECSSON); 1584 } 1585 } 1586 1587 static void stm32mp1_stgen_config(void) 1588 { 1589 uintptr_t stgen; 1590 uint32_t cntfid0; 1591 unsigned long rate; 1592 unsigned long long counter; 1593 1594 stgen = fdt_get_stgen_base(); 1595 cntfid0 = mmio_read_32(stgen + CNTFID_OFF); 1596 rate = get_clock_rate(stm32mp1_clk_get_parent(STGEN_K)); 1597 1598 if (cntfid0 == rate) { 1599 return; 1600 } 1601 1602 mmio_clrbits_32(stgen + CNTCR_OFF, CNTCR_EN); 1603 counter = (unsigned long long)mmio_read_32(stgen + CNTCVL_OFF); 1604 counter |= ((unsigned long long)mmio_read_32(stgen + CNTCVU_OFF)) << 32; 1605 counter = (counter * rate / cntfid0); 1606 1607 mmio_write_32(stgen + CNTCVL_OFF, (uint32_t)counter); 1608 mmio_write_32(stgen + CNTCVU_OFF, (uint32_t)(counter >> 32)); 1609 mmio_write_32(stgen + CNTFID_OFF, rate); 1610 mmio_setbits_32(stgen + CNTCR_OFF, CNTCR_EN); 1611 1612 write_cntfrq((u_register_t)rate); 1613 1614 /* Need to update timer with new frequency */ 1615 generic_delay_timer_init(); 1616 } 1617 1618 void stm32mp1_stgen_increment(unsigned long long offset_in_ms) 1619 { 1620 uintptr_t stgen; 1621 unsigned long long cnt; 1622 1623 stgen = fdt_get_stgen_base(); 1624 1625 cnt = ((unsigned long long)mmio_read_32(stgen + CNTCVU_OFF) << 32) | 1626 mmio_read_32(stgen + CNTCVL_OFF); 1627 1628 cnt += (offset_in_ms * mmio_read_32(stgen + CNTFID_OFF)) / 1000U; 1629 1630 mmio_clrbits_32(stgen + CNTCR_OFF, CNTCR_EN); 1631 mmio_write_32(stgen + CNTCVL_OFF, (uint32_t)cnt); 1632 mmio_write_32(stgen + CNTCVU_OFF, (uint32_t)(cnt >> 32)); 1633 mmio_setbits_32(stgen + CNTCR_OFF, CNTCR_EN); 1634 } 1635 1636 static void stm32mp1_pkcs_config(uint32_t pkcs) 1637 { 1638 uintptr_t address = stm32mp_rcc_base() + ((pkcs >> 4) & 0xFFFU); 1639 uint32_t value = pkcs & 0xFU; 1640 uint32_t mask = 0xFU; 1641 1642 if ((pkcs & BIT(31)) != 0U) { 1643 mask <<= 4; 1644 value <<= 4; 1645 } 1646 1647 mmio_clrsetbits_32(address, mask, value); 1648 } 1649 1650 int stm32mp1_clk_init(void) 1651 { 1652 uintptr_t rcc_base = stm32mp_rcc_base(); 1653 unsigned int clksrc[CLKSRC_NB]; 1654 unsigned int clkdiv[CLKDIV_NB]; 1655 unsigned int pllcfg[_PLL_NB][PLLCFG_NB]; 1656 int plloff[_PLL_NB]; 1657 int ret, len; 1658 enum stm32mp1_pll_id i; 1659 bool lse_css = false; 1660 bool pll3_preserve = false; 1661 bool pll4_preserve = false; 1662 bool pll4_bootrom = false; 1663 const fdt32_t *pkcs_cell; 1664 void *fdt; 1665 1666 if (fdt_get_address(&fdt) == 0) { 1667 return false; 1668 } 1669 1670 /* Check status field to disable security */ 1671 if (!fdt_get_rcc_secure_status()) { 1672 mmio_write_32(rcc_base + RCC_TZCR, 0); 1673 } 1674 1675 ret = fdt_rcc_read_uint32_array("st,clksrc", (uint32_t)CLKSRC_NB, 1676 clksrc); 1677 if (ret < 0) { 1678 return -FDT_ERR_NOTFOUND; 1679 } 1680 1681 ret = fdt_rcc_read_uint32_array("st,clkdiv", (uint32_t)CLKDIV_NB, 1682 clkdiv); 1683 if (ret < 0) { 1684 return -FDT_ERR_NOTFOUND; 1685 } 1686 1687 for (i = (enum stm32mp1_pll_id)0; i < _PLL_NB; i++) { 1688 char name[12]; 1689 1690 snprintf(name, sizeof(name), "st,pll@%d", i); 1691 plloff[i] = fdt_rcc_subnode_offset(name); 1692 1693 if (!fdt_check_node(plloff[i])) { 1694 continue; 1695 } 1696 1697 ret = fdt_read_uint32_array(fdt, plloff[i], "cfg", 1698 (int)PLLCFG_NB, pllcfg[i]); 1699 if (ret < 0) { 1700 return -FDT_ERR_NOTFOUND; 1701 } 1702 } 1703 1704 stm32mp1_mco_csg(clksrc[CLKSRC_MCO1], clkdiv[CLKDIV_MCO1]); 1705 stm32mp1_mco_csg(clksrc[CLKSRC_MCO2], clkdiv[CLKDIV_MCO2]); 1706 1707 /* 1708 * Switch ON oscillator found in device-tree. 1709 * Note: HSI already ON after BootROM stage. 1710 */ 1711 if (stm32mp1_osc[_LSI] != 0U) { 1712 stm32mp1_lsi_set(true); 1713 } 1714 if (stm32mp1_osc[_LSE] != 0U) { 1715 bool bypass, digbyp; 1716 uint32_t lsedrv; 1717 1718 bypass = fdt_osc_read_bool(_LSE, "st,bypass"); 1719 digbyp = fdt_osc_read_bool(_LSE, "st,digbypass"); 1720 lse_css = fdt_osc_read_bool(_LSE, "st,css"); 1721 lsedrv = fdt_osc_read_uint32_default(_LSE, "st,drive", 1722 LSEDRV_MEDIUM_HIGH); 1723 stm32mp1_lse_enable(bypass, digbyp, lsedrv); 1724 } 1725 if (stm32mp1_osc[_HSE] != 0U) { 1726 bool bypass, digbyp, css; 1727 1728 bypass = fdt_osc_read_bool(_HSE, "st,bypass"); 1729 digbyp = fdt_osc_read_bool(_HSE, "st,digbypass"); 1730 css = fdt_osc_read_bool(_HSE, "st,css"); 1731 stm32mp1_hse_enable(bypass, digbyp, css); 1732 } 1733 /* 1734 * CSI is mandatory for automatic I/O compensation (SYSCFG_CMPCR) 1735 * => switch on CSI even if node is not present in device tree 1736 */ 1737 stm32mp1_csi_set(true); 1738 1739 /* Come back to HSI */ 1740 ret = stm32mp1_set_clksrc(CLK_MPU_HSI); 1741 if (ret != 0) { 1742 return ret; 1743 } 1744 ret = stm32mp1_set_clksrc(CLK_AXI_HSI); 1745 if (ret != 0) { 1746 return ret; 1747 } 1748 ret = stm32mp1_set_clksrc(CLK_MCU_HSI); 1749 if (ret != 0) { 1750 return ret; 1751 } 1752 1753 if ((mmio_read_32(rcc_base + RCC_MP_RSTSCLRR) & 1754 RCC_MP_RSTSCLRR_MPUP0RSTF) != 0) { 1755 pll3_preserve = stm32mp1_check_pll_conf(_PLL3, 1756 clksrc[CLKSRC_PLL3], 1757 pllcfg[_PLL3], 1758 plloff[_PLL3]); 1759 pll4_preserve = stm32mp1_check_pll_conf(_PLL4, 1760 clksrc[CLKSRC_PLL4], 1761 pllcfg[_PLL4], 1762 plloff[_PLL4]); 1763 } 1764 1765 for (i = (enum stm32mp1_pll_id)0; i < _PLL_NB; i++) { 1766 if (((i == _PLL3) && pll3_preserve) || 1767 ((i == _PLL4) && pll4_preserve)) { 1768 continue; 1769 } 1770 1771 ret = stm32mp1_pll_stop(i); 1772 if (ret != 0) { 1773 return ret; 1774 } 1775 } 1776 1777 /* Configure HSIDIV */ 1778 if (stm32mp1_osc[_HSI] != 0U) { 1779 ret = stm32mp1_hsidiv(stm32mp1_osc[_HSI]); 1780 if (ret != 0) { 1781 return ret; 1782 } 1783 stm32mp1_stgen_config(); 1784 } 1785 1786 /* Select DIV */ 1787 /* No ready bit when MPUSRC != CLK_MPU_PLL1P_DIV, MPUDIV is disabled */ 1788 mmio_write_32(rcc_base + RCC_MPCKDIVR, 1789 clkdiv[CLKDIV_MPU] & RCC_DIVR_DIV_MASK); 1790 ret = stm32mp1_set_clkdiv(clkdiv[CLKDIV_AXI], rcc_base + RCC_AXIDIVR); 1791 if (ret != 0) { 1792 return ret; 1793 } 1794 ret = stm32mp1_set_clkdiv(clkdiv[CLKDIV_APB4], rcc_base + RCC_APB4DIVR); 1795 if (ret != 0) { 1796 return ret; 1797 } 1798 ret = stm32mp1_set_clkdiv(clkdiv[CLKDIV_APB5], rcc_base + RCC_APB5DIVR); 1799 if (ret != 0) { 1800 return ret; 1801 } 1802 ret = stm32mp1_set_clkdiv(clkdiv[CLKDIV_MCU], rcc_base + RCC_MCUDIVR); 1803 if (ret != 0) { 1804 return ret; 1805 } 1806 ret = stm32mp1_set_clkdiv(clkdiv[CLKDIV_APB1], rcc_base + RCC_APB1DIVR); 1807 if (ret != 0) { 1808 return ret; 1809 } 1810 ret = stm32mp1_set_clkdiv(clkdiv[CLKDIV_APB2], rcc_base + RCC_APB2DIVR); 1811 if (ret != 0) { 1812 return ret; 1813 } 1814 ret = stm32mp1_set_clkdiv(clkdiv[CLKDIV_APB3], rcc_base + RCC_APB3DIVR); 1815 if (ret != 0) { 1816 return ret; 1817 } 1818 1819 /* No ready bit for RTC */ 1820 mmio_write_32(rcc_base + RCC_RTCDIVR, 1821 clkdiv[CLKDIV_RTC] & RCC_DIVR_DIV_MASK); 1822 1823 /* Configure PLLs source */ 1824 ret = stm32mp1_set_clksrc(clksrc[CLKSRC_PLL12]); 1825 if (ret != 0) { 1826 return ret; 1827 } 1828 1829 if (!pll3_preserve) { 1830 ret = stm32mp1_set_clksrc(clksrc[CLKSRC_PLL3]); 1831 if (ret != 0) { 1832 return ret; 1833 } 1834 } 1835 1836 if (!pll4_preserve) { 1837 ret = stm32mp1_set_clksrc(clksrc[CLKSRC_PLL4]); 1838 if (ret != 0) { 1839 return ret; 1840 } 1841 } 1842 1843 /* Configure and start PLLs */ 1844 for (i = (enum stm32mp1_pll_id)0; i < _PLL_NB; i++) { 1845 uint32_t fracv; 1846 uint32_t csg[PLLCSG_NB]; 1847 1848 if (((i == _PLL3) && pll3_preserve) || 1849 ((i == _PLL4) && pll4_preserve && !pll4_bootrom)) { 1850 continue; 1851 } 1852 1853 if (!fdt_check_node(plloff[i])) { 1854 continue; 1855 } 1856 1857 if ((i == _PLL4) && pll4_bootrom) { 1858 /* Set output divider if not done by the Bootrom */ 1859 stm32mp1_pll_config_output(i, pllcfg[i]); 1860 continue; 1861 } 1862 1863 fracv = fdt_read_uint32_default(fdt, plloff[i], "frac", 0); 1864 1865 ret = stm32mp1_pll_config(i, pllcfg[i], fracv); 1866 if (ret != 0) { 1867 return ret; 1868 } 1869 ret = fdt_read_uint32_array(fdt, plloff[i], "csg", 1870 (uint32_t)PLLCSG_NB, csg); 1871 if (ret == 0) { 1872 stm32mp1_pll_csg(i, csg); 1873 } else if (ret != -FDT_ERR_NOTFOUND) { 1874 return ret; 1875 } 1876 1877 stm32mp1_pll_start(i); 1878 } 1879 /* Wait and start PLLs ouptut when ready */ 1880 for (i = (enum stm32mp1_pll_id)0; i < _PLL_NB; i++) { 1881 if (!fdt_check_node(plloff[i])) { 1882 continue; 1883 } 1884 1885 ret = stm32mp1_pll_output(i, pllcfg[i][PLLCFG_O]); 1886 if (ret != 0) { 1887 return ret; 1888 } 1889 } 1890 /* Wait LSE ready before to use it */ 1891 if (stm32mp1_osc[_LSE] != 0U) { 1892 stm32mp1_lse_wait(); 1893 } 1894 1895 /* Configure with expected clock source */ 1896 ret = stm32mp1_set_clksrc(clksrc[CLKSRC_MPU]); 1897 if (ret != 0) { 1898 return ret; 1899 } 1900 ret = stm32mp1_set_clksrc(clksrc[CLKSRC_AXI]); 1901 if (ret != 0) { 1902 return ret; 1903 } 1904 ret = stm32mp1_set_clksrc(clksrc[CLKSRC_MCU]); 1905 if (ret != 0) { 1906 return ret; 1907 } 1908 stm32mp1_set_rtcsrc(clksrc[CLKSRC_RTC], lse_css); 1909 1910 /* Configure PKCK */ 1911 pkcs_cell = fdt_rcc_read_prop("st,pkcs", &len); 1912 if (pkcs_cell != NULL) { 1913 bool ckper_disabled = false; 1914 uint32_t j; 1915 1916 for (j = 0; j < ((uint32_t)len / sizeof(uint32_t)); j++) { 1917 uint32_t pkcs = fdt32_to_cpu(pkcs_cell[j]); 1918 1919 if (pkcs == (uint32_t)CLK_CKPER_DISABLED) { 1920 ckper_disabled = true; 1921 continue; 1922 } 1923 stm32mp1_pkcs_config(pkcs); 1924 } 1925 1926 /* 1927 * CKPER is source for some peripheral clocks 1928 * (FMC-NAND / QPSI-NOR) and switching source is allowed 1929 * only if previous clock is still ON 1930 * => deactivated CKPER only after switching clock 1931 */ 1932 if (ckper_disabled) { 1933 stm32mp1_pkcs_config(CLK_CKPER_DISABLED); 1934 } 1935 } 1936 1937 /* Switch OFF HSI if not found in device-tree */ 1938 if (stm32mp1_osc[_HSI] == 0U) { 1939 stm32mp1_hsi_set(false); 1940 } 1941 stm32mp1_stgen_config(); 1942 1943 /* Software Self-Refresh mode (SSR) during DDR initilialization */ 1944 mmio_clrsetbits_32(rcc_base + RCC_DDRITFCR, 1945 RCC_DDRITFCR_DDRCKMOD_MASK, 1946 RCC_DDRITFCR_DDRCKMOD_SSR << 1947 RCC_DDRITFCR_DDRCKMOD_SHIFT); 1948 1949 return 0; 1950 } 1951 1952 static void stm32mp1_osc_clk_init(const char *name, 1953 enum stm32mp_osc_id index) 1954 { 1955 uint32_t frequency; 1956 1957 if (fdt_osc_read_freq(name, &frequency) == 0) { 1958 stm32mp1_osc[index] = frequency; 1959 } 1960 } 1961 1962 static void stm32mp1_osc_init(void) 1963 { 1964 enum stm32mp_osc_id i; 1965 1966 for (i = (enum stm32mp_osc_id)0 ; i < NB_OSC; i++) { 1967 stm32mp1_osc_clk_init(stm32mp_osc_node_label[i], i); 1968 } 1969 } 1970 1971 static void sync_earlyboot_clocks_state(void) 1972 { 1973 if (!stm32mp_is_single_core()) { 1974 stm32mp1_clk_enable_secure(RTCAPB); 1975 } 1976 } 1977 1978 int stm32mp1_clk_probe(void) 1979 { 1980 stm32mp1_osc_init(); 1981 1982 sync_earlyboot_clocks_state(); 1983 1984 return 0; 1985 } 1986