1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
4 * Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics.
8 #include <clk-uclass.h>
10 #include <stm32_rcc.h>
13 #include <asm/arch/stm32.h>
14 #include <asm/arch/stm32_pwr.h>
16 #include <dt-bindings/mfd/stm32f7-rcc.h>
18 #define RCC_CR_HSION BIT(0)
19 #define RCC_CR_HSEON BIT(16)
20 #define RCC_CR_HSERDY BIT(17)
21 #define RCC_CR_HSEBYP BIT(18)
22 #define RCC_CR_CSSON BIT(19)
23 #define RCC_CR_PLLON BIT(24)
24 #define RCC_CR_PLLRDY BIT(25)
25 #define RCC_CR_PLLSAION BIT(28)
26 #define RCC_CR_PLLSAIRDY BIT(29)
28 #define RCC_PLLCFGR_PLLM_MASK GENMASK(5, 0)
29 #define RCC_PLLCFGR_PLLN_MASK GENMASK(14, 6)
30 #define RCC_PLLCFGR_PLLP_MASK GENMASK(17, 16)
31 #define RCC_PLLCFGR_PLLQ_MASK GENMASK(27, 24)
32 #define RCC_PLLCFGR_PLLSRC BIT(22)
33 #define RCC_PLLCFGR_PLLM_SHIFT 0
34 #define RCC_PLLCFGR_PLLN_SHIFT 6
35 #define RCC_PLLCFGR_PLLP_SHIFT 16
36 #define RCC_PLLCFGR_PLLQ_SHIFT 24
38 #define RCC_CFGR_AHB_PSC_MASK GENMASK(7, 4)
39 #define RCC_CFGR_APB1_PSC_MASK GENMASK(12, 10)
40 #define RCC_CFGR_APB2_PSC_MASK GENMASK(15, 13)
41 #define RCC_CFGR_SW0 BIT(0)
42 #define RCC_CFGR_SW1 BIT(1)
43 #define RCC_CFGR_SW_MASK GENMASK(1, 0)
44 #define RCC_CFGR_SW_HSI 0
45 #define RCC_CFGR_SW_HSE RCC_CFGR_SW0
46 #define RCC_CFGR_SW_PLL RCC_CFGR_SW1
47 #define RCC_CFGR_SWS0 BIT(2)
48 #define RCC_CFGR_SWS1 BIT(3)
49 #define RCC_CFGR_SWS_MASK GENMASK(3, 2)
50 #define RCC_CFGR_SWS_HSI 0
51 #define RCC_CFGR_SWS_HSE RCC_CFGR_SWS0
52 #define RCC_CFGR_SWS_PLL RCC_CFGR_SWS1
53 #define RCC_CFGR_HPRE_SHIFT 4
54 #define RCC_CFGR_PPRE1_SHIFT 10
55 #define RCC_CFGR_PPRE2_SHIFT 13
57 #define RCC_PLLSAICFGR_PLLSAIN_MASK GENMASK(14, 6)
58 #define RCC_PLLSAICFGR_PLLSAIP_MASK GENMASK(17, 16)
59 #define RCC_PLLSAICFGR_PLLSAIQ_MASK GENMASK(27, 24)
60 #define RCC_PLLSAICFGR_PLLSAIR_MASK GENMASK(30, 28)
61 #define RCC_PLLSAICFGR_PLLSAIN_SHIFT 6
62 #define RCC_PLLSAICFGR_PLLSAIP_SHIFT 16
63 #define RCC_PLLSAICFGR_PLLSAIQ_SHIFT 24
64 #define RCC_PLLSAICFGR_PLLSAIR_SHIFT 28
65 #define RCC_PLLSAICFGR_PLLSAIP_4 BIT(16)
66 #define RCC_PLLSAICFGR_PLLSAIQ_4 BIT(26)
67 #define RCC_PLLSAICFGR_PLLSAIR_3 BIT(29) | BIT(28)
69 #define RCC_DCKCFGRX_TIMPRE BIT(24)
70 #define RCC_DCKCFGRX_CK48MSEL BIT(27)
71 #define RCC_DCKCFGRX_SDMMC1SEL BIT(28)
72 #define RCC_DCKCFGR2_SDMMC2SEL BIT(29)
74 #define RCC_DCKCFGR_PLLSAIDIVR_SHIFT 16
75 #define RCC_DCKCFGR_PLLSAIDIVR_MASK GENMASK(17, 16)
76 #define RCC_DCKCFGR_PLLSAIDIVR_2 0
79 * RCC AHB1ENR specific definitions
81 #define RCC_AHB1ENR_ETHMAC_EN BIT(25)
82 #define RCC_AHB1ENR_ETHMAC_TX_EN BIT(26)
83 #define RCC_AHB1ENR_ETHMAC_RX_EN BIT(27)
86 * RCC APB1ENR specific definitions
88 #define RCC_APB1ENR_TIM2EN BIT(0)
89 #define RCC_APB1ENR_PWREN BIT(28)
92 * RCC APB2ENR specific definitions
94 #define RCC_APB2ENR_SYSCFGEN BIT(14)
95 #define RCC_APB2ENR_SAI1EN BIT(22)
103 static const struct stm32_clk_info stm32f4_clk_info = {
109 .ahb_psc = AHB_PSC_1,
110 .apb1_psc = APB_PSC_4,
111 .apb2_psc = APB_PSC_2,
113 .has_overdrive = false,
117 static const struct stm32_clk_info stm32f7_clk_info = {
123 .ahb_psc = AHB_PSC_1,
124 .apb1_psc = APB_PSC_4,
125 .apb2_psc = APB_PSC_2,
127 .has_overdrive = true,
132 struct stm32_rcc_regs *base;
133 struct stm32_pwr_regs *pwr_regs;
134 struct stm32_clk_info info;
135 unsigned long hse_rate;
139 #ifdef CONFIG_VIDEO_STM32
140 static const u8 plldivr_table[] = { 0, 0, 2, 3, 4, 5, 6, 7 };
142 static const u8 pllsaidivr_table[] = { 2, 4, 8, 16 };
144 static int configure_clocks(struct udevice *dev)
146 struct stm32_clk *priv = dev_get_priv(dev);
147 struct stm32_rcc_regs *regs = priv->base;
148 struct stm32_pwr_regs *pwr = priv->pwr_regs;
149 struct pll_psc *sys_pll_psc = &priv->info.sys_pll_psc;
151 /* Reset RCC configuration */
152 setbits_le32(®s->cr, RCC_CR_HSION);
153 writel(0, ®s->cfgr); /* Reset CFGR */
154 clrbits_le32(®s->cr, (RCC_CR_HSEON | RCC_CR_CSSON
155 | RCC_CR_PLLON | RCC_CR_PLLSAION));
156 writel(0x24003010, ®s->pllcfgr); /* Reset value from RM */
157 clrbits_le32(®s->cr, RCC_CR_HSEBYP);
158 writel(0, ®s->cir); /* Disable all interrupts */
160 /* Configure for HSE+PLL operation */
161 setbits_le32(®s->cr, RCC_CR_HSEON);
162 while (!(readl(®s->cr) & RCC_CR_HSERDY))
165 setbits_le32(®s->cfgr, ((
166 sys_pll_psc->ahb_psc << RCC_CFGR_HPRE_SHIFT)
167 | (sys_pll_psc->apb1_psc << RCC_CFGR_PPRE1_SHIFT)
168 | (sys_pll_psc->apb2_psc << RCC_CFGR_PPRE2_SHIFT)));
170 /* Configure the main PLL */
171 setbits_le32(®s->pllcfgr, RCC_PLLCFGR_PLLSRC); /* pll source HSE */
172 clrsetbits_le32(®s->pllcfgr, RCC_PLLCFGR_PLLM_MASK,
173 sys_pll_psc->pll_m << RCC_PLLCFGR_PLLM_SHIFT);
174 clrsetbits_le32(®s->pllcfgr, RCC_PLLCFGR_PLLN_MASK,
175 sys_pll_psc->pll_n << RCC_PLLCFGR_PLLN_SHIFT);
176 clrsetbits_le32(®s->pllcfgr, RCC_PLLCFGR_PLLP_MASK,
177 ((sys_pll_psc->pll_p >> 1) - 1) << RCC_PLLCFGR_PLLP_SHIFT);
178 clrsetbits_le32(®s->pllcfgr, RCC_PLLCFGR_PLLQ_MASK,
179 sys_pll_psc->pll_q << RCC_PLLCFGR_PLLQ_SHIFT);
181 /* configure SDMMC clock */
182 if (priv->info.v2) { /*stm32f7 case */
184 /* select PLLSAIP as 48MHz clock source */
185 setbits_le32(®s->dckcfgr2, RCC_DCKCFGRX_CK48MSEL);
187 /* select PLLQ as 48MHz clock source */
188 clrbits_le32(®s->dckcfgr2, RCC_DCKCFGRX_CK48MSEL);
190 /* select 48MHz as SDMMC1 clock source */
191 clrbits_le32(®s->dckcfgr2, RCC_DCKCFGRX_SDMMC1SEL);
193 /* select 48MHz as SDMMC2 clock source */
194 clrbits_le32(®s->dckcfgr2, RCC_DCKCFGR2_SDMMC2SEL);
195 } else { /* stm32f4 case */
197 /* select PLLSAIP as 48MHz clock source */
198 setbits_le32(®s->dckcfgr, RCC_DCKCFGRX_CK48MSEL);
200 /* select PLLQ as 48MHz clock source */
201 clrbits_le32(®s->dckcfgr, RCC_DCKCFGRX_CK48MSEL);
203 /* select 48MHz as SDMMC1 clock source */
204 clrbits_le32(®s->dckcfgr, RCC_DCKCFGRX_SDMMC1SEL);
208 * Configure the SAI PLL to generate LTDC pixel clock and
209 * 48 Mhz for SDMMC and USB
211 clrsetbits_le32(®s->pllsaicfgr, RCC_PLLSAICFGR_PLLSAIP_MASK,
212 RCC_PLLSAICFGR_PLLSAIP_4);
213 clrsetbits_le32(®s->pllsaicfgr, RCC_PLLSAICFGR_PLLSAIR_MASK,
214 RCC_PLLSAICFGR_PLLSAIR_3);
215 clrsetbits_le32(®s->pllsaicfgr, RCC_PLLSAICFGR_PLLSAIN_MASK,
216 195 << RCC_PLLSAICFGR_PLLSAIN_SHIFT);
218 clrsetbits_le32(®s->dckcfgr, RCC_DCKCFGR_PLLSAIDIVR_MASK,
219 RCC_DCKCFGR_PLLSAIDIVR_2 << RCC_DCKCFGR_PLLSAIDIVR_SHIFT);
221 /* Enable the main PLL */
222 setbits_le32(®s->cr, RCC_CR_PLLON);
223 while (!(readl(®s->cr) & RCC_CR_PLLRDY))
226 /* Enable the SAI PLL */
227 setbits_le32(®s->cr, RCC_CR_PLLSAION);
228 while (!(readl(®s->cr) & RCC_CR_PLLSAIRDY))
230 setbits_le32(®s->apb1enr, RCC_APB1ENR_PWREN);
232 if (priv->info.has_overdrive) {
234 * Enable high performance mode
235 * System frequency up to 200 MHz
237 setbits_le32(&pwr->cr1, PWR_CR1_ODEN);
239 while (!(readl(&pwr->csr1) & PWR_CSR1_ODRDY))
241 /* Enable the Over-drive switch */
242 setbits_le32(&pwr->cr1, PWR_CR1_ODSWEN);
244 while (!(readl(&pwr->csr1) & PWR_CSR1_ODSWRDY))
248 stm32_flash_latency_cfg(5);
249 clrbits_le32(®s->cfgr, (RCC_CFGR_SW0 | RCC_CFGR_SW1));
250 setbits_le32(®s->cfgr, RCC_CFGR_SW_PLL);
252 while ((readl(®s->cfgr) & RCC_CFGR_SWS_MASK) !=
256 #ifdef CONFIG_ETH_DESIGNWARE
257 /* gate the SYSCFG clock, needed to set RMII ethernet interface */
258 setbits_le32(®s->apb2enr, RCC_APB2ENR_SYSCFGEN);
264 static bool stm32_clk_get_ck48msel(struct stm32_clk *priv)
266 struct stm32_rcc_regs *regs = priv->base;
268 if (priv->info.v2) /*stm32f7 case */
269 return readl(®s->dckcfgr2) & RCC_DCKCFGRX_CK48MSEL;
272 return readl(®s->dckcfgr) & RCC_DCKCFGRX_CK48MSEL;
275 static unsigned long stm32_clk_get_pllsai_vco_rate(struct stm32_clk *priv)
277 struct stm32_rcc_regs *regs = priv->base;
280 pllm = (readl(®s->pllcfgr) & RCC_PLLCFGR_PLLM_MASK);
281 pllsain = ((readl(®s->pllsaicfgr) & RCC_PLLSAICFGR_PLLSAIN_MASK)
282 >> RCC_PLLSAICFGR_PLLSAIN_SHIFT);
284 return ((priv->hse_rate / pllm) * pllsain);
287 static unsigned long stm32_clk_get_pllsai_rate(struct stm32_clk *priv,
288 enum pllsai_div output)
290 struct stm32_rcc_regs *regs = priv->base;
295 pll_div_output = ((((readl(®s->pllsaicfgr)
296 & RCC_PLLSAICFGR_PLLSAIP_MASK)
297 >> RCC_PLLSAICFGR_PLLSAIP_SHIFT) + 1) << 1);
300 pll_div_output = (readl(®s->pllsaicfgr)
301 & RCC_PLLSAICFGR_PLLSAIQ_MASK)
302 >> RCC_PLLSAICFGR_PLLSAIQ_SHIFT;
305 pll_div_output = (readl(®s->pllsaicfgr)
306 & RCC_PLLSAICFGR_PLLSAIR_MASK)
307 >> RCC_PLLSAICFGR_PLLSAIR_SHIFT;
310 pr_err("incorrect PLLSAI output %d\n", output);
314 return (stm32_clk_get_pllsai_vco_rate(priv) / pll_div_output);
317 static bool stm32_get_timpre(struct stm32_clk *priv)
319 struct stm32_rcc_regs *regs = priv->base;
322 if (priv->info.v2) /*stm32f7 case */
323 val = readl(®s->dckcfgr2);
325 val = readl(®s->dckcfgr);
326 /* get timer prescaler */
327 return !!(val & RCC_DCKCFGRX_TIMPRE);
330 static u32 stm32_get_hclk_rate(struct stm32_rcc_regs *regs, u32 sysclk)
333 /* Prescaler table lookups for clock computation */
334 u8 ahb_psc_table[16] = {
335 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9
338 shift = ahb_psc_table[(
339 (readl(®s->cfgr) & RCC_CFGR_AHB_PSC_MASK)
340 >> RCC_CFGR_HPRE_SHIFT)];
342 return sysclk >> shift;
345 static u8 stm32_get_apb_shift(struct stm32_rcc_regs *regs, enum apb apb)
347 /* Prescaler table lookups for clock computation */
348 u8 apb_psc_table[8] = {
349 0, 0, 0, 0, 1, 2, 3, 4
353 return apb_psc_table[(
354 (readl(®s->cfgr) & RCC_CFGR_APB1_PSC_MASK)
355 >> RCC_CFGR_PPRE1_SHIFT)];
357 return apb_psc_table[(
358 (readl(®s->cfgr) & RCC_CFGR_APB2_PSC_MASK)
359 >> RCC_CFGR_PPRE2_SHIFT)];
362 static u32 stm32_get_timer_rate(struct stm32_clk *priv, u32 sysclk,
365 struct stm32_rcc_regs *regs = priv->base;
366 u8 shift = stm32_get_apb_shift(regs, apb);
368 if (stm32_get_timpre(priv))
370 * if APB prescaler is configured to a
371 * division factor of 1, 2 or 4
377 return stm32_get_hclk_rate(regs, sysclk);
379 return (sysclk >> shift) * 4;
383 * if APB prescaler is configured to a
384 * division factor of 1
389 return (sysclk >> shift) * 2;
392 static ulong stm32_clk_get_rate(struct clk *clk)
394 struct stm32_clk *priv = dev_get_priv(clk->dev);
395 struct stm32_rcc_regs *regs = priv->base;
401 u16 pllm, plln, pllp, pllq;
403 if ((readl(®s->cfgr) & RCC_CFGR_SWS_MASK) ==
405 pllm = (readl(®s->pllcfgr) & RCC_PLLCFGR_PLLM_MASK);
406 plln = ((readl(®s->pllcfgr) & RCC_PLLCFGR_PLLN_MASK)
407 >> RCC_PLLCFGR_PLLN_SHIFT);
408 pllp = ((((readl(®s->pllcfgr) & RCC_PLLCFGR_PLLP_MASK)
409 >> RCC_PLLCFGR_PLLP_SHIFT) + 1) << 1);
410 pllq = ((readl(®s->pllcfgr) & RCC_PLLCFGR_PLLQ_MASK)
411 >> RCC_PLLCFGR_PLLQ_SHIFT);
412 vco = (priv->hse_rate / pllm) * plln;
420 * AHB CLOCK: 3 x 32 bits consecutive registers are used :
421 * AHB1, AHB2 and AHB3
423 case STM32F7_AHB1_CLOCK(GPIOA) ... STM32F7_AHB3_CLOCK(QSPI):
424 return stm32_get_hclk_rate(regs, sysclk);
426 case STM32F7_APB1_CLOCK(TIM2) ... STM32F7_APB1_CLOCK(UART8):
427 /* For timer clock, an additionnal prescaler is used*/
429 case STM32F7_APB1_CLOCK(TIM2):
430 case STM32F7_APB1_CLOCK(TIM3):
431 case STM32F7_APB1_CLOCK(TIM4):
432 case STM32F7_APB1_CLOCK(TIM5):
433 case STM32F7_APB1_CLOCK(TIM6):
434 case STM32F7_APB1_CLOCK(TIM7):
435 case STM32F7_APB1_CLOCK(TIM12):
436 case STM32F7_APB1_CLOCK(TIM13):
437 case STM32F7_APB1_CLOCK(TIM14):
438 return stm32_get_timer_rate(priv, sysclk, APB1);
440 return (sysclk >> stm32_get_apb_shift(regs, APB1));
443 case STM32F7_APB2_CLOCK(TIM1) ... STM32F7_APB2_CLOCK(DSI):
446 * particular case for SDMMC1 and SDMMC2 :
447 * 48Mhz source clock can be from main PLL or from
450 case STM32F7_APB2_CLOCK(SDMMC1):
451 case STM32F7_APB2_CLOCK(SDMMC2):
452 if (clk->id == STM32F7_APB2_CLOCK(SDMMC1))
453 sdmmcxsel_bit = RCC_DCKCFGRX_SDMMC1SEL;
455 sdmmcxsel_bit = RCC_DCKCFGR2_SDMMC2SEL;
457 if (readl(®s->dckcfgr2) & sdmmcxsel_bit)
458 /* System clock is selected as SDMMC1 clock */
461 * 48 MHz can be generated by either PLLSAIP
462 * or by PLLQ depending of CK48MSEL bit of RCC_DCKCFGR
464 if (stm32_clk_get_ck48msel(priv))
465 return stm32_clk_get_pllsai_rate(priv, PLLSAIP);
470 /* For timer clock, an additionnal prescaler is used*/
471 case STM32F7_APB2_CLOCK(TIM1):
472 case STM32F7_APB2_CLOCK(TIM8):
473 case STM32F7_APB2_CLOCK(TIM9):
474 case STM32F7_APB2_CLOCK(TIM10):
475 case STM32F7_APB2_CLOCK(TIM11):
476 return stm32_get_timer_rate(priv, sysclk, APB2);
479 /* particular case for LTDC clock */
480 case STM32F7_APB2_CLOCK(LTDC):
481 saidivr = readl(®s->dckcfgr);
482 saidivr = (saidivr & RCC_DCKCFGR_PLLSAIDIVR_MASK)
483 >> RCC_DCKCFGR_PLLSAIDIVR_SHIFT;
484 pllsai_rate = stm32_clk_get_pllsai_rate(priv, PLLSAIR);
486 return pllsai_rate / pllsaidivr_table[saidivr];
488 return (sysclk >> stm32_get_apb_shift(regs, APB2));
491 pr_err("clock index %ld out of range\n", clk->id);
496 static ulong stm32_set_rate(struct clk *clk, ulong rate)
498 #ifdef CONFIG_VIDEO_STM32
499 struct stm32_clk *priv = dev_get_priv(clk->dev);
500 struct stm32_rcc_regs *regs = priv->base;
501 u32 pllsair_rate, pllsai_vco_rate, current_rate;
502 u32 best_div, best_diff, diff;
504 u8 best_plldivr, best_pllsaidivr;
508 /* Only set_rate for LTDC clock is implemented */
509 if (clk->id != STM32F7_APB2_CLOCK(LTDC)) {
510 pr_err("set_rate not implemented for clock index %ld\n",
515 if (rate == stm32_clk_get_rate(clk))
516 /* already set to requested rate */
519 /* get the current PLLSAIR output freq */
520 pllsair_rate = stm32_clk_get_pllsai_rate(priv, PLLSAIR);
521 best_div = pllsair_rate / rate;
523 /* look into pllsaidivr_table if this divider is available*/
524 for (i = 0 ; i < sizeof(pllsaidivr_table); i++)
525 if (best_div == pllsaidivr_table[i]) {
526 /* set pll_saidivr with found value */
527 clrsetbits_le32(®s->dckcfgr,
528 RCC_DCKCFGR_PLLSAIDIVR_MASK,
529 pllsaidivr_table[i]);
534 * As no pllsaidivr value is suitable to obtain requested freq,
535 * test all combination of pllsaidivr * pllsair and find the one
536 * which give freq closest to requested rate.
539 pllsai_vco_rate = stm32_clk_get_pllsai_vco_rate(priv);
540 best_diff = ULONG_MAX;
544 * start at index 2 of plldivr_table as divider value at index 0
547 for (i = 2; i < sizeof(plldivr_table); i++) {
548 for (j = 0; j < sizeof(pllsaidivr_table); j++) {
549 div = plldivr_table[i] * pllsaidivr_table[j];
550 current_rate = pllsai_vco_rate / div;
551 /* perfect combination is found ? */
552 if (current_rate == rate) {
559 diff = (current_rate > rate) ?
560 current_rate - rate : rate - current_rate;
562 /* found a better combination ? */
563 if (diff < best_diff) {
574 /* Disable the SAI PLL */
575 clrbits_le32(®s->cr, RCC_CR_PLLSAION);
577 /* set pll_saidivr with found value */
578 clrsetbits_le32(®s->dckcfgr, RCC_DCKCFGR_PLLSAIDIVR_MASK,
579 best_pllsaidivr << RCC_DCKCFGR_PLLSAIDIVR_SHIFT);
581 /* set pllsair with found value */
582 clrsetbits_le32(®s->pllsaicfgr, RCC_PLLSAICFGR_PLLSAIR_MASK,
583 plldivr_table[best_plldivr]
584 << RCC_PLLSAICFGR_PLLSAIR_SHIFT);
586 /* Enable the SAI PLL */
587 setbits_le32(®s->cr, RCC_CR_PLLSAION);
588 while (!(readl(®s->cr) & RCC_CR_PLLSAIRDY))
591 div = plldivr_table[best_plldivr] * pllsaidivr_table[best_pllsaidivr];
592 return pllsai_vco_rate / div;
598 static int stm32_clk_enable(struct clk *clk)
600 struct stm32_clk *priv = dev_get_priv(clk->dev);
601 struct stm32_rcc_regs *regs = priv->base;
602 u32 offset = clk->id / 32;
603 u32 bit_index = clk->id % 32;
605 debug("%s: clkid = %ld, offset from AHB1ENR is %d, bit_index = %d\n",
606 __func__, clk->id, offset, bit_index);
607 setbits_le32(®s->ahb1enr + offset, BIT(bit_index));
612 static int stm32_clk_probe(struct udevice *dev)
614 struct ofnode_phandle_args args;
615 struct udevice *fixed_clock_dev = NULL;
619 debug("%s\n", __func__);
621 struct stm32_clk *priv = dev_get_priv(dev);
624 addr = dev_read_addr(dev);
625 if (addr == FDT_ADDR_T_NONE)
628 priv->base = (struct stm32_rcc_regs *)addr;
629 priv->pllsaip = true;
631 switch (dev_get_driver_data(dev)) {
633 priv->pllsaip = false;
634 /* fallback into STM32F469 case */
636 memcpy(&priv->info, &stm32f4_clk_info,
637 sizeof(struct stm32_clk_info));
641 memcpy(&priv->info, &stm32f7_clk_info,
642 sizeof(struct stm32_clk_info));
648 /* retrieve HSE frequency (external oscillator) */
649 err = uclass_get_device_by_name(UCLASS_CLK, "clk-hse",
653 pr_err("Can't find fixed clock (%d)", err);
657 err = clk_request(fixed_clock_dev, &clk);
659 pr_err("Can't request %s clk (%d)", fixed_clock_dev->name,
665 * set pllm factor accordingly to the external oscillator
666 * frequency (HSE). For STM32F4 and STM32F7, we want VCO
668 * if input PLL frequency is 25Mhz, divide it by 25
671 priv->hse_rate = clk_get_rate(&clk);
673 if (priv->hse_rate < 1000000) {
674 pr_err("%s: unexpected HSE clock rate = %ld \"n", __func__,
679 priv->info.sys_pll_psc.pll_m = priv->hse_rate / 1000000;
681 if (priv->info.has_overdrive) {
682 err = dev_read_phandle_with_args(dev, "st,syscfg", NULL, 0, 0,
685 debug("%s: can't find syscon device (%d)\n", __func__,
690 priv->pwr_regs = (struct stm32_pwr_regs *)ofnode_get_addr(args.node);
693 configure_clocks(dev);
698 static int stm32_clk_of_xlate(struct clk *clk, struct ofnode_phandle_args *args)
700 debug("%s(clk=%p)\n", __func__, clk);
702 if (args->args_count != 2) {
703 debug("Invaild args_count: %d\n", args->args_count);
707 if (args->args_count)
708 clk->id = args->args[1];
715 static struct clk_ops stm32_clk_ops = {
716 .of_xlate = stm32_clk_of_xlate,
717 .enable = stm32_clk_enable,
718 .get_rate = stm32_clk_get_rate,
719 .set_rate = stm32_set_rate,
722 U_BOOT_DRIVER(stm32fx_clk) = {
723 .name = "stm32fx_rcc_clock",
725 .ops = &stm32_clk_ops,
726 .probe = stm32_clk_probe,
727 .priv_auto_alloc_size = sizeof(struct stm32_clk),
728 .flags = DM_FLAG_PRE_RELOC,