+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
* Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics.
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#define RCC_PLLSAICFGR_PLLSAIN_MASK GENMASK(14, 6)
#define RCC_PLLSAICFGR_PLLSAIP_MASK GENMASK(17, 16)
+#define RCC_PLLSAICFGR_PLLSAIQ_MASK GENMASK(27, 24)
+#define RCC_PLLSAICFGR_PLLSAIR_MASK GENMASK(30, 28)
#define RCC_PLLSAICFGR_PLLSAIN_SHIFT 6
#define RCC_PLLSAICFGR_PLLSAIP_SHIFT 16
+#define RCC_PLLSAICFGR_PLLSAIQ_SHIFT 24
+#define RCC_PLLSAICFGR_PLLSAIR_SHIFT 28
#define RCC_PLLSAICFGR_PLLSAIP_4 BIT(16)
#define RCC_PLLSAICFGR_PLLSAIQ_4 BIT(26)
-#define RCC_PLLSAICFGR_PLLSAIR_2 BIT(29)
+#define RCC_PLLSAICFGR_PLLSAIR_3 BIT(29) | BIT(28)
#define RCC_DCKCFGRX_TIMPRE BIT(24)
#define RCC_DCKCFGRX_CK48MSEL BIT(27)
#define RCC_DCKCFGRX_SDMMC1SEL BIT(28)
#define RCC_DCKCFGR2_SDMMC2SEL BIT(29)
+#define RCC_DCKCFGR_PLLSAIDIVR_SHIFT 16
+#define RCC_DCKCFGR_PLLSAIDIVR_MASK GENMASK(17, 16)
+#define RCC_DCKCFGR_PLLSAIDIVR_2 0
+
/*
* RCC AHB1ENR specific definitions
*/
#define RCC_APB2ENR_SYSCFGEN BIT(14)
#define RCC_APB2ENR_SAI1EN BIT(22)
+enum pllsai_div {
+ PLLSAIP,
+ PLLSAIQ,
+ PLLSAIR,
+};
+
static const struct stm32_clk_info stm32f4_clk_info = {
/* 180 MHz */
.sys_pll_psc = {
struct stm32_pwr_regs *pwr_regs;
struct stm32_clk_info info;
unsigned long hse_rate;
+ bool pllsaip;
};
+#ifdef CONFIG_VIDEO_STM32
+static const u8 plldivr_table[] = { 0, 0, 2, 3, 4, 5, 6, 7 };
+#endif
+static const u8 pllsaidivr_table[] = { 2, 4, 8, 16 };
+
static int configure_clocks(struct udevice *dev)
{
struct stm32_clk *priv = dev_get_priv(dev);
struct stm32_rcc_regs *regs = priv->base;
struct stm32_pwr_regs *pwr = priv->pwr_regs;
struct pll_psc *sys_pll_psc = &priv->info.sys_pll_psc;
- u32 pllsaicfgr = 0;
/* Reset RCC configuration */
setbits_le32(®s->cr, RCC_CR_HSION);
clrsetbits_le32(®s->pllcfgr, RCC_PLLCFGR_PLLQ_MASK,
sys_pll_psc->pll_q << RCC_PLLCFGR_PLLQ_SHIFT);
- /* Configure the SAI PLL to get a 48 MHz source */
- pllsaicfgr = RCC_PLLSAICFGR_PLLSAIR_2 | RCC_PLLSAICFGR_PLLSAIQ_4 |
- RCC_PLLSAICFGR_PLLSAIP_4;
- pllsaicfgr |= 192 << RCC_PLLSAICFGR_PLLSAIN_SHIFT;
- writel(pllsaicfgr, ®s->pllsaicfgr);
-
- /* Enable the main PLL */
- setbits_le32(®s->cr, RCC_CR_PLLON);
- while (!(readl(®s->cr) & RCC_CR_PLLRDY))
- ;
-
+ /* configure SDMMC clock */
if (priv->info.v2) { /*stm32f7 case */
- /* select PLLSAI as 48MHz clock source */
- setbits_le32(®s->dckcfgr2, RCC_DCKCFGRX_CK48MSEL);
+ if (priv->pllsaip)
+ /* select PLLSAIP as 48MHz clock source */
+ setbits_le32(®s->dckcfgr2, RCC_DCKCFGRX_CK48MSEL);
+ else
+ /* select PLLQ as 48MHz clock source */
+ clrbits_le32(®s->dckcfgr2, RCC_DCKCFGRX_CK48MSEL);
/* select 48MHz as SDMMC1 clock source */
clrbits_le32(®s->dckcfgr2, RCC_DCKCFGRX_SDMMC1SEL);
/* select 48MHz as SDMMC2 clock source */
clrbits_le32(®s->dckcfgr2, RCC_DCKCFGR2_SDMMC2SEL);
} else { /* stm32f4 case */
- /* select PLLSAI as 48MHz clock source */
- setbits_le32(®s->dckcfgr, RCC_DCKCFGRX_CK48MSEL);
+ if (priv->pllsaip)
+ /* select PLLSAIP as 48MHz clock source */
+ setbits_le32(®s->dckcfgr, RCC_DCKCFGRX_CK48MSEL);
+ else
+ /* select PLLQ as 48MHz clock source */
+ clrbits_le32(®s->dckcfgr, RCC_DCKCFGRX_CK48MSEL);
/* select 48MHz as SDMMC1 clock source */
clrbits_le32(®s->dckcfgr, RCC_DCKCFGRX_SDMMC1SEL);
}
+ /*
+ * Configure the SAI PLL to generate LTDC pixel clock and
+ * 48 Mhz for SDMMC and USB
+ */
+ clrsetbits_le32(®s->pllsaicfgr, RCC_PLLSAICFGR_PLLSAIP_MASK,
+ RCC_PLLSAICFGR_PLLSAIP_4);
+ clrsetbits_le32(®s->pllsaicfgr, RCC_PLLSAICFGR_PLLSAIR_MASK,
+ RCC_PLLSAICFGR_PLLSAIR_3);
+ clrsetbits_le32(®s->pllsaicfgr, RCC_PLLSAICFGR_PLLSAIN_MASK,
+ 195 << RCC_PLLSAICFGR_PLLSAIN_SHIFT);
+
+ clrsetbits_le32(®s->dckcfgr, RCC_DCKCFGR_PLLSAIDIVR_MASK,
+ RCC_DCKCFGR_PLLSAIDIVR_2 << RCC_DCKCFGR_PLLSAIDIVR_SHIFT);
+
+ /* Enable the main PLL */
+ setbits_le32(®s->cr, RCC_CR_PLLON);
+ while (!(readl(®s->cr) & RCC_CR_PLLRDY))
+ ;
+
/* Enable the SAI PLL */
setbits_le32(®s->cr, RCC_CR_PLLSAION);
while (!(readl(®s->cr) & RCC_CR_PLLSAIRDY))
;
-
setbits_le32(®s->apb1enr, RCC_APB1ENR_PWREN);
if (priv->info.has_overdrive) {
while ((readl(®s->cfgr) & RCC_CFGR_SWS_MASK) !=
RCC_CFGR_SWS_PLL)
;
- /* gate the SAI clock, needed for MMC 1&2 clocks */
- setbits_le32(®s->apb2enr, RCC_APB2ENR_SAI1EN);
#ifdef CONFIG_ETH_DESIGNWARE
/* gate the SYSCFG clock, needed to set RMII ethernet interface */
return 0;
}
-static unsigned long stm32_clk_pll48clk_rate(struct stm32_clk *priv,
- u32 vco)
+static bool stm32_clk_get_ck48msel(struct stm32_clk *priv)
{
struct stm32_rcc_regs *regs = priv->base;
- u16 pllq, pllm, pllsain, pllsaip;
- bool pllsai;
-
- pllq = (readl(®s->pllcfgr) & RCC_PLLCFGR_PLLQ_MASK)
- >> RCC_PLLCFGR_PLLQ_SHIFT;
if (priv->info.v2) /*stm32f7 case */
- pllsai = readl(®s->dckcfgr2) & RCC_DCKCFGRX_CK48MSEL;
+ return readl(®s->dckcfgr2) & RCC_DCKCFGRX_CK48MSEL;
else
- pllsai = readl(®s->dckcfgr) & RCC_DCKCFGRX_CK48MSEL;
- if (pllsai) {
- /* PLL48CLK is selected from PLLSAI, get PLLSAI value */
- pllm = (readl(®s->pllcfgr) & RCC_PLLCFGR_PLLM_MASK);
- pllsain = ((readl(®s->pllsaicfgr) & RCC_PLLSAICFGR_PLLSAIN_MASK)
- >> RCC_PLLSAICFGR_PLLSAIN_SHIFT);
- pllsaip = ((((readl(®s->pllsaicfgr) & RCC_PLLSAICFGR_PLLSAIP_MASK)
- >> RCC_PLLSAICFGR_PLLSAIP_SHIFT) + 1) << 1);
- return ((priv->hse_rate / pllm) * pllsain) / pllsaip;
+ return readl(®s->dckcfgr) & RCC_DCKCFGRX_CK48MSEL;
+}
+
+static unsigned long stm32_clk_get_pllsai_vco_rate(struct stm32_clk *priv)
+{
+ struct stm32_rcc_regs *regs = priv->base;
+ u16 pllm, pllsain;
+
+ pllm = (readl(®s->pllcfgr) & RCC_PLLCFGR_PLLM_MASK);
+ pllsain = ((readl(®s->pllsaicfgr) & RCC_PLLSAICFGR_PLLSAIN_MASK)
+ >> RCC_PLLSAICFGR_PLLSAIN_SHIFT);
+
+ return ((priv->hse_rate / pllm) * pllsain);
+}
+
+static unsigned long stm32_clk_get_pllsai_rate(struct stm32_clk *priv,
+ enum pllsai_div output)
+{
+ struct stm32_rcc_regs *regs = priv->base;
+ u16 pll_div_output;
+
+ switch (output) {
+ case PLLSAIP:
+ pll_div_output = ((((readl(®s->pllsaicfgr)
+ & RCC_PLLSAICFGR_PLLSAIP_MASK)
+ >> RCC_PLLSAICFGR_PLLSAIP_SHIFT) + 1) << 1);
+ break;
+ case PLLSAIQ:
+ pll_div_output = (readl(®s->pllsaicfgr)
+ & RCC_PLLSAICFGR_PLLSAIQ_MASK)
+ >> RCC_PLLSAICFGR_PLLSAIQ_SHIFT;
+ break;
+ case PLLSAIR:
+ pll_div_output = (readl(®s->pllsaicfgr)
+ & RCC_PLLSAICFGR_PLLSAIR_MASK)
+ >> RCC_PLLSAICFGR_PLLSAIR_SHIFT;
+ break;
+ default:
+ pr_err("incorrect PLLSAI output %d\n", output);
+ return -EINVAL;
}
- /* PLL48CLK is selected from PLLQ */
- return vco / pllq;
+
+ return (stm32_clk_get_pllsai_vco_rate(priv) / pll_div_output);
}
static bool stm32_get_timpre(struct stm32_clk *priv)
struct stm32_rcc_regs *regs = priv->base;
u32 sysclk = 0;
u32 vco;
- u16 pllm, plln, pllp;
+ u32 sdmmcxsel_bit;
+ u32 saidivr;
+ u32 pllsai_rate;
+ u16 pllm, plln, pllp, pllq;
if ((readl(®s->cfgr) & RCC_CFGR_SWS_MASK) ==
RCC_CFGR_SWS_PLL) {
>> RCC_PLLCFGR_PLLN_SHIFT);
pllp = ((((readl(®s->pllcfgr) & RCC_PLLCFGR_PLLP_MASK)
>> RCC_PLLCFGR_PLLP_SHIFT) + 1) << 1);
+ pllq = ((readl(®s->pllcfgr) & RCC_PLLCFGR_PLLQ_MASK)
+ >> RCC_PLLCFGR_PLLQ_SHIFT);
vco = (priv->hse_rate / pllm) * plln;
sysclk = vco / pllp;
} else {
return (sysclk >> stm32_get_apb_shift(regs, APB1));
/* APB2 CLOCK */
- case STM32F7_APB2_CLOCK(TIM1) ... STM32F7_APB2_CLOCK(LTDC):
+ case STM32F7_APB2_CLOCK(TIM1) ... STM32F7_APB2_CLOCK(DSI):
+ switch (clk->id) {
/*
* particular case for SDMMC1 and SDMMC2 :
* 48Mhz source clock can be from main PLL or from
- * SAI PLL
+ * PLLSAIP
*/
- switch (clk->id) {
case STM32F7_APB2_CLOCK(SDMMC1):
- if (readl(®s->dckcfgr2) & RCC_DCKCFGRX_SDMMC1SEL)
- /* System clock is selected as SDMMC1 clock */
- return sysclk;
- else
- return stm32_clk_pll48clk_rate(priv, vco);
- break;
case STM32F7_APB2_CLOCK(SDMMC2):
- if (readl(®s->dckcfgr2) & RCC_DCKCFGR2_SDMMC2SEL)
- /* System clock is selected as SDMMC2 clock */
+ if (clk->id == STM32F7_APB2_CLOCK(SDMMC1))
+ sdmmcxsel_bit = RCC_DCKCFGRX_SDMMC1SEL;
+ else
+ sdmmcxsel_bit = RCC_DCKCFGR2_SDMMC2SEL;
+
+ if (readl(®s->dckcfgr2) & sdmmcxsel_bit)
+ /* System clock is selected as SDMMC1 clock */
return sysclk;
+ /*
+ * 48 MHz can be generated by either PLLSAIP
+ * or by PLLQ depending of CK48MSEL bit of RCC_DCKCFGR
+ */
+ if (stm32_clk_get_ck48msel(priv))
+ return stm32_clk_get_pllsai_rate(priv, PLLSAIP);
else
- return stm32_clk_pll48clk_rate(priv, vco);
+ return (vco / pllq);
break;
/* For timer clock, an additionnal prescaler is used*/
case STM32F7_APB2_CLOCK(TIM11):
return stm32_get_timer_rate(priv, sysclk, APB2);
break;
+
+ /* particular case for LTDC clock */
+ case STM32F7_APB2_CLOCK(LTDC):
+ saidivr = readl(®s->dckcfgr);
+ saidivr = (saidivr & RCC_DCKCFGR_PLLSAIDIVR_MASK)
+ >> RCC_DCKCFGR_PLLSAIDIVR_SHIFT;
+ pllsai_rate = stm32_clk_get_pllsai_rate(priv, PLLSAIR);
+
+ return pllsai_rate / pllsaidivr_table[saidivr];
}
return (sysclk >> stm32_get_apb_shift(regs, APB2));
static ulong stm32_set_rate(struct clk *clk, ulong rate)
{
+#ifdef CONFIG_VIDEO_STM32
+ struct stm32_clk *priv = dev_get_priv(clk->dev);
+ struct stm32_rcc_regs *regs = priv->base;
+ u32 pllsair_rate, pllsai_vco_rate, current_rate;
+ u32 best_div, best_diff, diff;
+ u16 div;
+ u8 best_plldivr, best_pllsaidivr;
+ u8 i, j;
+ bool found = false;
+
+ /* Only set_rate for LTDC clock is implemented */
+ if (clk->id != STM32F7_APB2_CLOCK(LTDC)) {
+ pr_err("set_rate not implemented for clock index %ld\n",
+ clk->id);
+ return 0;
+ }
+
+ if (rate == stm32_clk_get_rate(clk))
+ /* already set to requested rate */
+ return rate;
+
+ /* get the current PLLSAIR output freq */
+ pllsair_rate = stm32_clk_get_pllsai_rate(priv, PLLSAIR);
+ best_div = pllsair_rate / rate;
+
+ /* look into pllsaidivr_table if this divider is available*/
+ for (i = 0 ; i < sizeof(pllsaidivr_table); i++)
+ if (best_div == pllsaidivr_table[i]) {
+ /* set pll_saidivr with found value */
+ clrsetbits_le32(®s->dckcfgr,
+ RCC_DCKCFGR_PLLSAIDIVR_MASK,
+ pllsaidivr_table[i]);
+ return rate;
+ }
+
+ /*
+ * As no pllsaidivr value is suitable to obtain requested freq,
+ * test all combination of pllsaidivr * pllsair and find the one
+ * which give freq closest to requested rate.
+ */
+
+ pllsai_vco_rate = stm32_clk_get_pllsai_vco_rate(priv);
+ best_diff = ULONG_MAX;
+ best_pllsaidivr = 0;
+ best_plldivr = 0;
+ /*
+ * start at index 2 of plldivr_table as divider value at index 0
+ * and 1 are 0)
+ */
+ for (i = 2; i < sizeof(plldivr_table); i++) {
+ for (j = 0; j < sizeof(pllsaidivr_table); j++) {
+ div = plldivr_table[i] * pllsaidivr_table[j];
+ current_rate = pllsai_vco_rate / div;
+ /* perfect combination is found ? */
+ if (current_rate == rate) {
+ best_pllsaidivr = j;
+ best_plldivr = i;
+ found = true;
+ break;
+ }
+
+ diff = (current_rate > rate) ?
+ current_rate - rate : rate - current_rate;
+
+ /* found a better combination ? */
+ if (diff < best_diff) {
+ best_diff = diff;
+ best_pllsaidivr = j;
+ best_plldivr = i;
+ }
+ }
+
+ if (found)
+ break;
+ }
+
+ /* Disable the SAI PLL */
+ clrbits_le32(®s->cr, RCC_CR_PLLSAION);
+
+ /* set pll_saidivr with found value */
+ clrsetbits_le32(®s->dckcfgr, RCC_DCKCFGR_PLLSAIDIVR_MASK,
+ best_pllsaidivr << RCC_DCKCFGR_PLLSAIDIVR_SHIFT);
+
+ /* set pllsair with found value */
+ clrsetbits_le32(®s->pllsaicfgr, RCC_PLLSAICFGR_PLLSAIR_MASK,
+ plldivr_table[best_plldivr]
+ << RCC_PLLSAICFGR_PLLSAIR_SHIFT);
+
+ /* Enable the SAI PLL */
+ setbits_le32(®s->cr, RCC_CR_PLLSAION);
+ while (!(readl(®s->cr) & RCC_CR_PLLSAIRDY))
+ ;
+
+ div = plldivr_table[best_plldivr] * pllsaidivr_table[best_pllsaidivr];
+ return pllsai_vco_rate / div;
+#else
return 0;
+#endif
}
static int stm32_clk_enable(struct clk *clk)
return -EINVAL;
priv->base = (struct stm32_rcc_regs *)addr;
+ priv->pllsaip = true;
switch (dev_get_driver_data(dev)) {
- case STM32F4:
+ case STM32F42X:
+ priv->pllsaip = false;
+ /* fallback into STM32F469 case */
+ case STM32F469:
memcpy(&priv->info, &stm32f4_clk_info,
sizeof(struct stm32_clk_info));
break;
+
case STM32F7:
memcpy(&priv->info, &stm32f7_clk_info,
sizeof(struct stm32_clk_info));
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