diff options
| -rw-r--r-- | arch/arm/include/asm/arch-stm32f7/stm32.h | 1 | ||||
| -rw-r--r-- | drivers/clk/clk_stm32f.c | 101 | ||||
| -rw-r--r-- | include/dt-bindings/mfd/stm32f7-rcc.h | 1 | ||||
| -rw-r--r-- | include/stm32_rcc.h | 1 |
4 files changed, 103 insertions, 1 deletions
diff --git a/arch/arm/include/asm/arch-stm32f7/stm32.h b/arch/arm/include/asm/arch-stm32f7/stm32.h index 0117039cf2..f5e08ef8f5 100644 --- a/arch/arm/include/asm/arch-stm32f7/stm32.h +++ b/arch/arm/include/asm/arch-stm32f7/stm32.h @@ -92,6 +92,7 @@ struct stm32_rcc_regs { u32 plli2scfgr; /* RCC PLLI2S configuration */ u32 pllsaicfgr; /* PLLSAI configuration */ u32 dckcfgr; /* dedicated clocks configuration register */ + u32 dckcfgr2; /* dedicated clocks configuration register */ }; #define STM32_RCC ((struct stm32_rcc_regs *)RCC_BASE) diff --git a/drivers/clk/clk_stm32f.c b/drivers/clk/clk_stm32f.c index 6e29c55e0a..634f0717c6 100644 --- a/drivers/clk/clk_stm32f.c +++ b/drivers/clk/clk_stm32f.c @@ -24,6 +24,8 @@ #define RCC_CR_CSSON BIT(19) #define RCC_CR_PLLON BIT(24) #define RCC_CR_PLLRDY BIT(25) +#define RCC_CR_PLLSAION BIT(28) +#define RCC_CR_PLLSAIRDY BIT(29) #define RCC_PLLCFGR_PLLM_MASK GENMASK(5, 0) #define RCC_PLLCFGR_PLLN_MASK GENMASK(14, 6) @@ -54,6 +56,20 @@ #define RCC_CFGR_PPRE1_SHIFT 10 #define RCC_CFGR_PPRE2_SHIFT 13 +#define RCC_PLLCFGR_PLLSAIN_MASK GENMASK(14, 6) +#define RCC_PLLCFGR_PLLSAIP_MASK GENMASK(17, 16) +#define RCC_PLLSAICFGR_PLLSAIN_SHIFT 6 +#define RCC_PLLSAICFGR_PLLSAIP_SHIFT 16 +#define RCC_PLLSAICFGR_PLLSAIP_4 BIT(17) +#define RCC_PLLSAICFGR_PLLSAIQ_4 BIT(26) +#define RCC_PLLSAICFGR_PLLSAIR_2 BIT(29) + +#define RCC_DCKCFGRX_CK48MSEL BIT(27) +#define RCC_DCKCFGRX_SDMMC1SEL BIT(28) +#define RCC_DCKCFGR2_SDMMC2SEL BIT(29) + +#define RCC_APB2ENR_SAI1EN BIT(22) + /* * RCC AHB1ENR specific definitions */ @@ -84,6 +100,7 @@ struct stm32_clk_info stm32f4_clk_info = { .apb2_psc = APB_PSC_2, }, .has_overdrive = false, + .v2 = false, }; struct stm32_clk_info stm32f7_clk_info = { @@ -98,6 +115,7 @@ struct stm32_clk_info stm32f7_clk_info = { .apb2_psc = APB_PSC_2, }, .has_overdrive = true, + .v2 = true, }; struct stm32_clk { @@ -112,12 +130,13 @@ static int configure_clocks(struct udevice *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); writel(0, ®s->cfgr); /* Reset CFGR */ clrbits_le32(®s->cr, (RCC_CR_HSEON | RCC_CR_CSSON - | RCC_CR_PLLON)); + | RCC_CR_PLLON | RCC_CR_PLLSAION)); writel(0x24003010, ®s->pllcfgr); /* Reset value from RM */ clrbits_le32(®s->cr, RCC_CR_HSEBYP); writel(0, ®s->cir); /* Disable all interrupts */ @@ -143,11 +162,39 @@ static int configure_clocks(struct udevice *dev) 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)) ; + if (priv->info->v2) { /*stm32f7 case */ + /* select PLLSAI as 48MHz clock source */ + setbits_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); + + /* select 48MHz as SDMMC1 clock source */ + clrbits_le32(®s->dckcfgr, RCC_DCKCFGRX_SDMMC1SEL); + } + + /* 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) { @@ -173,10 +220,40 @@ static int configure_clocks(struct udevice *dev) 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); return 0; } +static unsigned long stm32_clk_pll48clk_rate(struct stm32_clk *priv, + u32 sysclk) +{ + 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; + 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_PLLCFGR_PLLSAIN_MASK) + >> RCC_PLLSAICFGR_PLLSAIN_SHIFT); + pllsaip = ((((readl(®s->pllsaicfgr) & RCC_PLLCFGR_PLLSAIP_MASK) + >> RCC_PLLSAICFGR_PLLSAIP_SHIFT) + 1) << 1); + return ((CONFIG_STM32_HSE_HZ / pllm) * pllsain) / pllsaip; + } + /* PLL48CLK is selected from PLLQ */ + return sysclk / pllq; +} + static unsigned long stm32_clk_get_rate(struct clk *clk) { struct stm32_clk *priv = dev_get_priv(clk->dev); @@ -222,6 +299,28 @@ static unsigned long stm32_clk_get_rate(struct clk *clk) return sysclk >>= shift; /* APB2 CLOCK */ case STM32F7_APB2_CLOCK(TIM1) ... STM32F7_APB2_CLOCK(LTDC): + /* + * particular case for SDMMC1 and SDMMC2 : + * 48Mhz source clock can be from main PLL or from + * SAI PLL + */ + 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, sysclk); + break; + case STM32F7_APB2_CLOCK(SDMMC2): + if (readl(®s->dckcfgr2) & RCC_DCKCFGR2_SDMMC2SEL) + /* System clock is selected as SDMMC2 clock */ + return sysclk; + else + return stm32_clk_pll48clk_rate(priv, sysclk); + break; + } + shift = apb_psc_table[( (readl(®s->cfgr) & RCC_CFGR_APB2_PSC_MASK) >> RCC_CFGR_PPRE2_SHIFT)]; diff --git a/include/dt-bindings/mfd/stm32f7-rcc.h b/include/dt-bindings/mfd/stm32f7-rcc.h index e36cc69959..44c0914493 100644 --- a/include/dt-bindings/mfd/stm32f7-rcc.h +++ b/include/dt-bindings/mfd/stm32f7-rcc.h @@ -90,6 +90,7 @@ #define STM32F7_RCC_APB2_TIM8 1 #define STM32F7_RCC_APB2_USART1 4 #define STM32F7_RCC_APB2_USART6 5 +#define STM32F7_RCC_APB2_SDMMC2 7 #define STM32F7_RCC_APB2_ADC1 8 #define STM32F7_RCC_APB2_ADC2 9 #define STM32F7_RCC_APB2_ADC3 10 diff --git a/include/stm32_rcc.h b/include/stm32_rcc.h index 6dfb9cc257..fb0855268e 100644 --- a/include/stm32_rcc.h +++ b/include/stm32_rcc.h @@ -37,6 +37,7 @@ struct pll_psc { struct stm32_clk_info { struct pll_psc sys_pll_psc; bool has_overdrive; + bool v2; }; enum soc_family { |