dm: clk: add clk driver support for stm32h7 SoCs
This driver implements basic clock setup, only clock gating
is implemented.
This driver doesn't implement .of_match as it's binded
by MFD RCC driver.
Files include/dt-bindings/clock/stm32h7-clks.h and
doc/device-tree-bindings/clock/st,stm32h7-rcc.txt
will be available soon in a kernel tag, as all the
bindings have been acked by Rob Herring [1].
[1] http://lkml.iu.edu/hypermail/linux/kernel/1704.0/00935.html
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/clk/clk_stm32h7.c b/drivers/clk/clk_stm32h7.c
new file mode 100644
index 0000000..fd0e3ab
--- /dev/null
+++ b/drivers/clk/clk_stm32h7.c
@@ -0,0 +1,802 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ * Author(s): Patrice CHOTARD, <patrice.chotard@st.com> for STMicroelectronics.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <asm/io.h>
+#include <dm/root.h>
+
+#include <dt-bindings/clock/stm32h7-clks.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* RCC CR specific definitions */
+#define RCC_CR_HSION BIT(0)
+#define RCC_CR_HSIRDY BIT(2)
+
+#define RCC_CR_HSEON BIT(16)
+#define RCC_CR_HSERDY BIT(17)
+#define RCC_CR_HSEBYP BIT(18)
+#define RCC_CR_PLL1ON BIT(24)
+#define RCC_CR_PLL1RDY BIT(25)
+
+#define RCC_CR_HSIDIV_MASK GENMASK(4, 3)
+#define RCC_CR_HSIDIV_SHIFT 3
+
+#define RCC_CFGR_SW_MASK GENMASK(2, 0)
+#define RCC_CFGR_SW_HSI 0
+#define RCC_CFGR_SW_CSI 1
+#define RCC_CFGR_SW_HSE 2
+#define RCC_CFGR_SW_PLL1 3
+
+#define RCC_PLLCKSELR_PLLSRC_HSI 0
+#define RCC_PLLCKSELR_PLLSRC_CSI 1
+#define RCC_PLLCKSELR_PLLSRC_HSE 2
+#define RCC_PLLCKSELR_PLLSRC_NO_CLK 3
+
+#define RCC_PLLCKSELR_PLLSRC_MASK GENMASK(1, 0)
+
+#define RCC_PLLCKSELR_DIVM1_SHIFT 4
+#define RCC_PLLCKSELR_DIVM1_MASK GENMASK(9, 4)
+
+#define RCC_PLL1DIVR_DIVN1_MASK GENMASK(8, 0)
+
+#define RCC_PLL1DIVR_DIVP1_SHIFT 9
+#define RCC_PLL1DIVR_DIVP1_MASK GENMASK(15, 9)
+
+#define RCC_PLL1DIVR_DIVQ1_SHIFT 16
+#define RCC_PLL1DIVR_DIVQ1_MASK GENMASK(22, 16)
+
+#define RCC_PLL1DIVR_DIVR1_SHIFT 24
+#define RCC_PLL1DIVR_DIVR1_MASK GENMASK(30, 24)
+
+#define RCC_PLL1FRACR_FRACN1_SHIFT 3
+#define RCC_PLL1FRACR_FRACN1_MASK GENMASK(15, 3)
+
+#define RCC_PLLCFGR_PLL1RGE_SHIFT 2
+#define PLL1RGE_1_2_MHZ 0
+#define PLL1RGE_2_4_MHZ 1
+#define PLL1RGE_4_8_MHZ 2
+#define PLL1RGE_8_16_MHZ 3
+#define RCC_PLLCFGR_DIVP1EN BIT(16)
+#define RCC_PLLCFGR_DIVQ1EN BIT(17)
+#define RCC_PLLCFGR_DIVR1EN BIT(18)
+
+#define RCC_D1CFGR_HPRE_MASK GENMASK(3, 0)
+#define RCC_D1CFGR_HPRE_DIVIDED BIT(3)
+#define RCC_D1CFGR_HPRE_DIVIDER GENMASK(2, 0)
+
+#define RCC_D1CFGR_HPRE_DIV2 8
+
+#define RCC_D1CFGR_D1PPRE_SHIFT 4
+#define RCC_D1CFGR_D1PPRE_DIVIDED BIT(6)
+#define RCC_D1CFGR_D1PPRE_DIVIDER GENMASK(5, 4)
+
+#define RCC_D1CFGR_D1CPRE_SHIFT 8
+#define RCC_D1CFGR_D1CPRE_DIVIDER GENMASK(10, 8)
+#define RCC_D1CFGR_D1CPRE_DIVIDED BIT(11)
+
+#define RCC_D2CFGR_D2PPRE1_SHIFT 4
+#define RCC_D2CFGR_D2PPRE1_DIVIDED BIT(6)
+#define RCC_D2CFGR_D2PPRE1_DIVIDER GENMASK(5, 4)
+
+#define RCC_D2CFGR_D2PPRE2_SHIFT 8
+#define RCC_D2CFGR_D2PPRE2_DIVIDED BIT(10)
+#define RCC_D2CFGR_D2PPRE2_DIVIDER GENMASK(9, 8)
+
+#define RCC_D3CFGR_D3PPRE_SHIFT 4
+#define RCC_D3CFGR_D3PPRE_DIVIDED BIT(6)
+#define RCC_D3CFGR_D3PPRE_DIVIDER GENMASK(5, 4)
+
+#define RCC_D1CCIPR_FMCSRC_MASK GENMASK(1, 0)
+#define FMCSRC_HCLKD1 0
+#define FMCSRC_PLL1_Q_CK 1
+#define FMCSRC_PLL2_R_CK 2
+#define FMCSRC_PER_CK 3
+
+#define RCC_D1CCIPR_QSPISRC_MASK GENMASK(5, 4)
+#define RCC_D1CCIPR_QSPISRC_SHIFT 4
+#define QSPISRC_HCLKD1 0
+#define QSPISRC_PLL1_Q_CK 1
+#define QSPISRC_PLL2_R_CK 2
+#define QSPISRC_PER_CK 3
+
+#define PWR_CR3 0x0c
+#define PWR_CR3_SDEN BIT(2)
+#define PWR_D3CR 0x18
+#define PWR_D3CR_VOS_MASK GENMASK(15, 14)
+#define PWR_D3CR_VOS_SHIFT 14
+#define VOS_SCALE_3 1
+#define VOS_SCALE_2 2
+#define VOS_SCALE_1 3
+#define PWR_D3CR_VOSREADY BIT(13)
+
+struct stm32_rcc_regs {
+ u32 cr; /* 0x00 Source Control Register */
+ u32 icscr; /* 0x04 Internal Clock Source Calibration Register */
+ u32 crrcr; /* 0x08 Clock Recovery RC Register */
+ u32 reserved1; /* 0x0c reserved */
+ u32 cfgr; /* 0x10 Clock Configuration Register */
+ u32 reserved2; /* 0x14 reserved */
+ u32 d1cfgr; /* 0x18 Domain 1 Clock Configuration Register */
+ u32 d2cfgr; /* 0x1c Domain 2 Clock Configuration Register */
+ u32 d3cfgr; /* 0x20 Domain 3 Clock Configuration Register */
+ u32 reserved3; /* 0x24 reserved */
+ u32 pllckselr; /* 0x28 PLLs Clock Source Selection Register */
+ u32 pllcfgr; /* 0x2c PLLs Configuration Register */
+ u32 pll1divr; /* 0x30 PLL1 Dividers Configuration Register */
+ u32 pll1fracr; /* 0x34 PLL1 Fractional Divider Register */
+ u32 pll2divr; /* 0x38 PLL2 Dividers Configuration Register */
+ u32 pll2fracr; /* 0x3c PLL2 Fractional Divider Register */
+ u32 pll3divr; /* 0x40 PLL3 Dividers Configuration Register */
+ u32 pll3fracr; /* 0x44 PLL3 Fractional Divider Register */
+ u32 reserved4; /* 0x48 reserved */
+ u32 d1ccipr; /* 0x4c Domain 1 Kernel Clock Configuration Register */
+ u32 d2ccip1r; /* 0x50 Domain 2 Kernel Clock Configuration Register */
+ u32 d2ccip2r; /* 0x54 Domain 2 Kernel Clock Configuration Register */
+ u32 d3ccipr; /* 0x58 Domain 3 Kernel Clock Configuration Register */
+ u32 reserved5; /* 0x5c reserved */
+ u32 cier; /* 0x60 Clock Source Interrupt Enable Register */
+ u32 cifr; /* 0x64 Clock Source Interrupt Flag Register */
+ u32 cicr; /* 0x68 Clock Source Interrupt Clear Register */
+ u32 reserved6; /* 0x6c reserved */
+ u32 bdcr; /* 0x70 Backup Domain Control Register */
+ u32 csr; /* 0x74 Clock Control and Status Register */
+ u32 reserved7; /* 0x78 reserved */
+
+ u32 ahb3rstr; /* 0x7c AHB3 Peripheral Reset Register */
+ u32 ahb1rstr; /* 0x80 AHB1 Peripheral Reset Register */
+ u32 ahb2rstr; /* 0x84 AHB2 Peripheral Reset Register */
+ u32 ahb4rstr; /* 0x88 AHB4 Peripheral Reset Register */
+
+ u32 apb3rstr; /* 0x8c APB3 Peripheral Reset Register */
+ u32 apb1lrstr; /* 0x90 APB1 low Peripheral Reset Register */
+ u32 apb1hrstr; /* 0x94 APB1 high Peripheral Reset Register */
+ u32 apb2rstr; /* 0x98 APB2 Clock Register */
+ u32 apb4rstr; /* 0x9c APB4 Clock Register */
+
+ u32 gcr; /* 0xa0 Global Control Register */
+ u32 reserved8; /* 0xa4 reserved */
+ u32 d3amr; /* 0xa8 D3 Autonomous mode Register */
+ u32 reserved9[9];/* 0xac to 0xcc reserved */
+ u32 rsr; /* 0xd0 Reset Status Register */
+ u32 ahb3enr; /* 0xd4 AHB3 Clock Register */
+ u32 ahb1enr; /* 0xd8 AHB1 Clock Register */
+ u32 ahb2enr; /* 0xdc AHB2 Clock Register */
+ u32 ahb4enr; /* 0xe0 AHB4 Clock Register */
+
+ u32 apb3enr; /* 0xe4 APB3 Clock Register */
+ u32 apb1lenr; /* 0xe8 APB1 low Clock Register */
+ u32 apb1henr; /* 0xec APB1 high Clock Register */
+ u32 apb2enr; /* 0xf0 APB2 Clock Register */
+ u32 apb4enr; /* 0xf4 APB4 Clock Register */
+};
+
+#define RCC_AHB3ENR offsetof(struct stm32_rcc_regs, ahb3enr)
+#define RCC_AHB1ENR offsetof(struct stm32_rcc_regs, ahb1enr)
+#define RCC_AHB2ENR offsetof(struct stm32_rcc_regs, ahb2enr)
+#define RCC_AHB4ENR offsetof(struct stm32_rcc_regs, ahb4enr)
+#define RCC_APB3ENR offsetof(struct stm32_rcc_regs, apb3enr)
+#define RCC_APB1LENR offsetof(struct stm32_rcc_regs, apb1lenr)
+#define RCC_APB1HENR offsetof(struct stm32_rcc_regs, apb1henr)
+#define RCC_APB2ENR offsetof(struct stm32_rcc_regs, apb2enr)
+#define RCC_APB4ENR offsetof(struct stm32_rcc_regs, apb4enr)
+
+struct clk_cfg {
+ u32 gate_offset;
+ u8 gate_bit_idx;
+ const char *name;
+};
+
+#define CLK(_gate_offset, _bit_idx, _name) \
+{ \
+ .gate_offset = _gate_offset,\
+ .gate_bit_idx = _bit_idx,\
+ .name = _name,\
+}
+
+/*
+ * the way all these entries are sorted in this array could seem
+ * unlogical, but we are dependant of kernel DT_bindings,
+ * where clocks are separate in 2 banks, peripheral clocks and
+ * kernel clocks.
+ */
+
+static const struct clk_cfg clk_map[] = {
+ CLK(RCC_AHB3ENR, 31, "d1sram1"), /* peripheral clocks */
+ CLK(RCC_AHB3ENR, 30, "itcm"),
+ CLK(RCC_AHB3ENR, 29, "dtcm2"),
+ CLK(RCC_AHB3ENR, 28, "dtcm1"),
+ CLK(RCC_AHB3ENR, 8, "flitf"),
+ CLK(RCC_AHB3ENR, 5, "jpgdec"),
+ CLK(RCC_AHB3ENR, 4, "dma2d"),
+ CLK(RCC_AHB3ENR, 0, "mdma"),
+ CLK(RCC_AHB1ENR, 28, "usb2ulpi"),
+ CLK(RCC_AHB1ENR, 17, "eth1rx"),
+ CLK(RCC_AHB1ENR, 16, "eth1tx"),
+ CLK(RCC_AHB1ENR, 15, "eth1mac"),
+ CLK(RCC_AHB1ENR, 14, "art"),
+ CLK(RCC_AHB1ENR, 26, "usb1ulpi"),
+ CLK(RCC_AHB1ENR, 1, "dma2"),
+ CLK(RCC_AHB1ENR, 0, "dma1"),
+ CLK(RCC_AHB2ENR, 31, "d2sram3"),
+ CLK(RCC_AHB2ENR, 30, "d2sram2"),
+ CLK(RCC_AHB2ENR, 29, "d2sram1"),
+ CLK(RCC_AHB2ENR, 5, "hash"),
+ CLK(RCC_AHB2ENR, 4, "crypt"),
+ CLK(RCC_AHB2ENR, 0, "camitf"),
+ CLK(RCC_AHB4ENR, 28, "bkpram"),
+ CLK(RCC_AHB4ENR, 25, "hsem"),
+ CLK(RCC_AHB4ENR, 21, "bdma"),
+ CLK(RCC_AHB4ENR, 19, "crc"),
+ CLK(RCC_AHB4ENR, 10, "gpiok"),
+ CLK(RCC_AHB4ENR, 9, "gpioj"),
+ CLK(RCC_AHB4ENR, 8, "gpioi"),
+ CLK(RCC_AHB4ENR, 7, "gpioh"),
+ CLK(RCC_AHB4ENR, 6, "gpiog"),
+ CLK(RCC_AHB4ENR, 5, "gpiof"),
+ CLK(RCC_AHB4ENR, 4, "gpioe"),
+ CLK(RCC_AHB4ENR, 3, "gpiod"),
+ CLK(RCC_AHB4ENR, 2, "gpioc"),
+ CLK(RCC_AHB4ENR, 1, "gpiob"),
+ CLK(RCC_AHB4ENR, 0, "gpioa"),
+ CLK(RCC_APB3ENR, 6, "wwdg1"),
+ CLK(RCC_APB1LENR, 29, "dac12"),
+ CLK(RCC_APB1LENR, 11, "wwdg2"),
+ CLK(RCC_APB1LENR, 8, "tim14"),
+ CLK(RCC_APB1LENR, 7, "tim13"),
+ CLK(RCC_APB1LENR, 6, "tim12"),
+ CLK(RCC_APB1LENR, 5, "tim7"),
+ CLK(RCC_APB1LENR, 4, "tim6"),
+ CLK(RCC_APB1LENR, 3, "tim5"),
+ CLK(RCC_APB1LENR, 2, "tim4"),
+ CLK(RCC_APB1LENR, 1, "tim3"),
+ CLK(RCC_APB1LENR, 0, "tim2"),
+ CLK(RCC_APB1HENR, 5, "mdios"),
+ CLK(RCC_APB1HENR, 4, "opamp"),
+ CLK(RCC_APB1HENR, 1, "crs"),
+ CLK(RCC_APB2ENR, 18, "tim17"),
+ CLK(RCC_APB2ENR, 17, "tim16"),
+ CLK(RCC_APB2ENR, 16, "tim15"),
+ CLK(RCC_APB2ENR, 1, "tim8"),
+ CLK(RCC_APB2ENR, 0, "tim1"),
+ CLK(RCC_APB4ENR, 26, "tmpsens"),
+ CLK(RCC_APB4ENR, 16, "rtcapb"),
+ CLK(RCC_APB4ENR, 15, "vref"),
+ CLK(RCC_APB4ENR, 14, "comp12"),
+ CLK(RCC_APB4ENR, 1, "syscfg"),
+ CLK(RCC_AHB3ENR, 16, "sdmmc1"), /* kernel clocks */
+ CLK(RCC_AHB3ENR, 14, "quadspi"),
+ CLK(RCC_AHB3ENR, 12, "fmc"),
+ CLK(RCC_AHB1ENR, 27, "usb2otg"),
+ CLK(RCC_AHB1ENR, 25, "usb1otg"),
+ CLK(RCC_AHB1ENR, 5, "adc12"),
+ CLK(RCC_AHB2ENR, 9, "sdmmc2"),
+ CLK(RCC_AHB2ENR, 6, "rng"),
+ CLK(RCC_AHB4ENR, 24, "adc3"),
+ CLK(RCC_APB3ENR, 4, "dsi"),
+ CLK(RCC_APB3ENR, 3, "ltdc"),
+ CLK(RCC_APB1LENR, 31, "usart8"),
+ CLK(RCC_APB1LENR, 30, "usart7"),
+ CLK(RCC_APB1LENR, 27, "hdmicec"),
+ CLK(RCC_APB1LENR, 23, "i2c3"),
+ CLK(RCC_APB1LENR, 22, "i2c2"),
+ CLK(RCC_APB1LENR, 21, "i2c1"),
+ CLK(RCC_APB1LENR, 20, "uart5"),
+ CLK(RCC_APB1LENR, 19, "uart4"),
+ CLK(RCC_APB1LENR, 18, "usart3"),
+ CLK(RCC_APB1LENR, 17, "usart2"),
+ CLK(RCC_APB1LENR, 16, "spdifrx"),
+ CLK(RCC_APB1LENR, 15, "spi3"),
+ CLK(RCC_APB1LENR, 14, "spi2"),
+ CLK(RCC_APB1LENR, 9, "lptim1"),
+ CLK(RCC_APB1HENR, 8, "fdcan"),
+ CLK(RCC_APB1HENR, 2, "swp"),
+ CLK(RCC_APB2ENR, 29, "hrtim"),
+ CLK(RCC_APB2ENR, 28, "dfsdm1"),
+ CLK(RCC_APB2ENR, 24, "sai3"),
+ CLK(RCC_APB2ENR, 23, "sai2"),
+ CLK(RCC_APB2ENR, 22, "sai1"),
+ CLK(RCC_APB2ENR, 20, "spi5"),
+ CLK(RCC_APB2ENR, 13, "spi4"),
+ CLK(RCC_APB2ENR, 12, "spi1"),
+ CLK(RCC_APB2ENR, 5, "usart6"),
+ CLK(RCC_APB2ENR, 4, "usart1"),
+ CLK(RCC_APB4ENR, 21, "sai4a"),
+ CLK(RCC_APB4ENR, 21, "sai4b"),
+ CLK(RCC_APB4ENR, 12, "lptim5"),
+ CLK(RCC_APB4ENR, 11, "lptim4"),
+ CLK(RCC_APB4ENR, 10, "lptim3"),
+ CLK(RCC_APB4ENR, 9, "lptim2"),
+ CLK(RCC_APB4ENR, 7, "i2c4"),
+ CLK(RCC_APB4ENR, 5, "spi6"),
+ CLK(RCC_APB4ENR, 3, "lpuart1"),
+};
+
+struct stm32_clk {
+ struct stm32_rcc_regs *rcc_base;
+ struct regmap *pwr_regmap;
+};
+
+struct pll_psc {
+ u8 divm;
+ u16 divn;
+ u8 divp;
+ u8 divq;
+ u8 divr;
+};
+
+/*
+ * OSC_HSE = 25 MHz
+ * VCO = 500MHz
+ * pll1_p = 250MHz / pll1_q = 250MHz pll1_r = 250Mhz
+ */
+struct pll_psc sys_pll_psc = {
+ .divm = 4,
+ .divn = 80,
+ .divp = 2,
+ .divq = 2,
+ .divr = 2,
+};
+
+int configure_clocks(struct udevice *dev)
+{
+ struct stm32_clk *priv = dev_get_priv(dev);
+ struct stm32_rcc_regs *regs = priv->rcc_base;
+ uint8_t *pwr_base = (uint8_t *)regmap_get_range(priv->pwr_regmap, 0);
+ uint32_t pllckselr = 0;
+ uint32_t pll1divr = 0;
+ uint32_t pllcfgr = 0;
+
+ /* Switch on HSI */
+ setbits_le32(®s->cr, RCC_CR_HSION);
+ while (!(readl(®s->cr) & RCC_CR_HSIRDY))
+ ;
+
+ /* Reset CFGR, now HSI is the default system clock */
+ writel(0, ®s->cfgr);
+
+ /* Set all kernel domain clock registers to reset value*/
+ writel(0x0, ®s->d1ccipr);
+ writel(0x0, ®s->d2ccip1r);
+ writel(0x0, ®s->d2ccip2r);
+
+ /* Set voltage scaling at scale 1 */
+ clrsetbits_le32(pwr_base + PWR_D3CR, PWR_D3CR_VOS_MASK,
+ VOS_SCALE_1 << PWR_D3CR_VOS_SHIFT);
+ /* disable step down converter */
+ clrbits_le32(pwr_base + PWR_CR3, PWR_CR3_SDEN);
+ while (!(readl(pwr_base + PWR_D3CR) & PWR_D3CR_VOSREADY))
+ ;
+
+ /* disable HSE to configure it */
+ clrbits_le32(®s->cr, RCC_CR_HSEON);
+ while ((readl(®s->cr) & RCC_CR_HSERDY))
+ ;
+
+ /* clear HSE bypass and set it ON */
+ clrbits_le32(®s->cr, RCC_CR_HSEBYP);
+ /* Switch on HSE */
+ setbits_le32(®s->cr, RCC_CR_HSEON);
+ while (!(readl(®s->cr) & RCC_CR_HSERDY))
+ ;
+
+ /* pll setup, disable it */
+ clrbits_le32(®s->cr, RCC_CR_PLL1ON);
+ while ((readl(®s->cr) & RCC_CR_PLL1RDY))
+ ;
+
+ /* Select HSE as PLL clock source */
+ pllckselr |= RCC_PLLCKSELR_PLLSRC_HSE;
+ pllckselr |= sys_pll_psc.divm << RCC_PLLCKSELR_DIVM1_SHIFT;
+ writel(pllckselr, ®s->pllckselr);
+
+ pll1divr |= (sys_pll_psc.divr - 1) << RCC_PLL1DIVR_DIVR1_SHIFT;
+ pll1divr |= (sys_pll_psc.divq - 1) << RCC_PLL1DIVR_DIVQ1_SHIFT;
+ pll1divr |= (sys_pll_psc.divp - 1) << RCC_PLL1DIVR_DIVP1_SHIFT;
+ pll1divr |= (sys_pll_psc.divn - 1);
+ writel(pll1divr, ®s->pll1divr);
+
+ pllcfgr |= PLL1RGE_4_8_MHZ << RCC_PLLCFGR_PLL1RGE_SHIFT;
+ pllcfgr |= RCC_PLLCFGR_DIVP1EN;
+ pllcfgr |= RCC_PLLCFGR_DIVQ1EN;
+ pllcfgr |= RCC_PLLCFGR_DIVR1EN;
+ writel(pllcfgr, ®s->pllcfgr);
+
+ /* pll setup, enable it */
+ setbits_le32(®s->cr, RCC_CR_PLL1ON);
+
+ /* set HPRE (/2) DI clk --> 125MHz */
+ clrsetbits_le32(®s->d1cfgr, RCC_D1CFGR_HPRE_MASK,
+ RCC_D1CFGR_HPRE_DIV2);
+
+ /* select PLL1 as system clock source (sys_ck)*/
+ clrsetbits_le32(®s->cfgr, RCC_CFGR_SW_MASK, RCC_CFGR_SW_PLL1);
+ while ((readl(®s->cfgr) & RCC_CFGR_SW_MASK) != RCC_CFGR_SW_PLL1)
+ ;
+
+ /* sdram: use pll1_q as fmc_k clk */
+ clrsetbits_le32(®s->d1ccipr, RCC_D1CCIPR_FMCSRC_MASK,
+ FMCSRC_PLL1_Q_CK);
+
+ return 0;
+}
+
+static u32 stm32_get_HSI_divider(struct stm32_rcc_regs *regs)
+{
+ u32 divider;
+
+ /* get HSI divider value */
+ divider = readl(®s->cr) & RCC_CR_HSIDIV_MASK;
+ divider = divider >> RCC_CR_HSIDIV_SHIFT;
+
+ return divider;
+};
+
+enum pllsrc {
+ HSE,
+ LSE,
+ HSI,
+ CSI,
+ I2S,
+ TIMER,
+ PLLSRC_NB,
+};
+
+static const char * const pllsrc_name[PLLSRC_NB] = {
+ [HSE] = "clk-hse",
+ [LSE] = "clk-lse",
+ [HSI] = "clk-hsi",
+ [CSI] = "clk-csi",
+ [I2S] = "clk-i2s",
+ [TIMER] = "timer-clk"
+};
+
+static ulong stm32_get_rate(struct stm32_rcc_regs *regs, enum pllsrc pllsrc)
+{
+ struct clk clk;
+ struct udevice *fixed_clock_dev = NULL;
+ u32 divider;
+ int ret;
+ const char *name = pllsrc_name[pllsrc];
+
+ debug("%s name %s\n", __func__, name);
+
+ clk.id = 0;
+ ret = uclass_get_device_by_name(UCLASS_CLK, name, &fixed_clock_dev);
+ if (ret) {
+ error("Can't find clk %s (%d)", name, ret);
+ return 0;
+ }
+
+ ret = clk_request(fixed_clock_dev, &clk);
+ if (ret) {
+ error("Can't request %s clk (%d)", name, ret);
+ return 0;
+ }
+
+ divider = 0;
+ if (pllsrc == HSI)
+ divider = stm32_get_HSI_divider(regs);
+
+ debug("%s divider %d rate %ld\n", __func__,
+ divider, clk_get_rate(&clk));
+
+ return clk_get_rate(&clk) >> divider;
+};
+
+enum pll1_output {
+ PLL1_P_CK,
+ PLL1_Q_CK,
+ PLL1_R_CK,
+};
+
+static u32 stm32_get_PLL1_rate(struct stm32_rcc_regs *regs,
+ enum pll1_output output)
+{
+ ulong pllsrc = 0;
+ u32 divm1, divn1, divp1, divq1, divr1, fracn1;
+ ulong vco, rate;
+
+ /* get the PLLSRC */
+ switch (readl(®s->pllckselr) & RCC_PLLCKSELR_PLLSRC_MASK) {
+ case RCC_PLLCKSELR_PLLSRC_HSI:
+ pllsrc = stm32_get_rate(regs, HSI);
+ break;
+ case RCC_PLLCKSELR_PLLSRC_CSI:
+ pllsrc = stm32_get_rate(regs, CSI);
+ break;
+ case RCC_PLLCKSELR_PLLSRC_HSE:
+ pllsrc = stm32_get_rate(regs, HSE);
+ break;
+ case RCC_PLLCKSELR_PLLSRC_NO_CLK:
+ /* shouldn't happen */
+ error("wrong value for RCC_PLLCKSELR register\n");
+ pllsrc = 0;
+ break;
+ }
+
+ /* pllsrc = 0 ? no need to go ahead */
+ if (!pllsrc)
+ return pllsrc;
+
+ /* get divm1, divp1, divn1 and divr1 */
+ divm1 = readl(®s->pllckselr) & RCC_PLLCKSELR_DIVM1_MASK;
+ divm1 = divm1 >> RCC_PLLCKSELR_DIVM1_SHIFT;
+
+ divn1 = (readl(®s->pll1divr) & RCC_PLL1DIVR_DIVN1_MASK) + 1;
+
+ divp1 = readl(®s->pll1divr) & RCC_PLL1DIVR_DIVP1_MASK;
+ divp1 = (divp1 >> RCC_PLL1DIVR_DIVP1_SHIFT) + 1;
+
+ divq1 = readl(®s->pll1divr) & RCC_PLL1DIVR_DIVQ1_MASK;
+ divq1 = (divq1 >> RCC_PLL1DIVR_DIVQ1_SHIFT) + 1;
+
+ divr1 = readl(®s->pll1divr) & RCC_PLL1DIVR_DIVR1_MASK;
+ divr1 = (divr1 >> RCC_PLL1DIVR_DIVR1_SHIFT) + 1;
+
+ fracn1 = readl(®s->pll1fracr) & RCC_PLL1DIVR_DIVR1_MASK;
+ fracn1 = fracn1 & RCC_PLL1DIVR_DIVR1_SHIFT;
+
+ vco = (pllsrc / divm1) * divn1;
+ rate = (pllsrc * fracn1) / (divm1 * 8192);
+
+ debug("%s divm1 = %d divn1 = %d divp1 = %d divq1 = %d divr1 = %d\n",
+ __func__, divm1, divn1, divp1, divq1, divr1);
+ debug("%s fracn1 = %d vco = %ld rate = %ld\n",
+ __func__, fracn1, vco, rate);
+
+ switch (output) {
+ case PLL1_P_CK:
+ return (vco + rate) / divp1;
+ break;
+ case PLL1_Q_CK:
+ return (vco + rate) / divq1;
+ break;
+
+ case PLL1_R_CK:
+ return (vco + rate) / divr1;
+ break;
+ }
+
+ return -EINVAL;
+}
+
+static ulong stm32_clk_get_rate(struct clk *clk)
+{
+ struct stm32_clk *priv = dev_get_priv(clk->dev);
+ struct stm32_rcc_regs *regs = priv->rcc_base;
+ ulong sysclk = 0;
+ u32 gate_offset;
+ u32 d1cfgr;
+ /* prescaler table lookups for clock computation */
+ u16 prescaler_table[8] = {2, 4, 8, 16, 64, 128, 256, 512};
+ u8 source, idx;
+
+ /*
+ * get system clock (sys_ck) source
+ * can be HSI_CK, CSI_CK, HSE_CK or pll1_p_ck
+ */
+ source = readl(®s->cfgr) & RCC_CFGR_SW_MASK;
+ switch (source) {
+ case RCC_CFGR_SW_PLL1:
+ sysclk = stm32_get_PLL1_rate(regs, PLL1_P_CK);
+ break;
+ case RCC_CFGR_SW_HSE:
+ sysclk = stm32_get_rate(regs, HSE);
+ break;
+
+ case RCC_CFGR_SW_CSI:
+ sysclk = stm32_get_rate(regs, CSI);
+ break;
+
+ case RCC_CFGR_SW_HSI:
+ sysclk = stm32_get_rate(regs, HSI);
+ break;
+ }
+
+ /* sysclk = 0 ? no need to go ahead */
+ if (!sysclk)
+ return sysclk;
+
+ debug("%s system clock: source = %d freq = %ld\n",
+ __func__, source, sysclk);
+
+ d1cfgr = readl(®s->d1cfgr);
+
+ if (d1cfgr & RCC_D1CFGR_D1CPRE_DIVIDED) {
+ /* get D1 domain Core prescaler */
+ idx = (d1cfgr & RCC_D1CFGR_D1CPRE_DIVIDER) >>
+ RCC_D1CFGR_D1CPRE_SHIFT;
+ sysclk = sysclk / prescaler_table[idx];
+ }
+
+ if (d1cfgr & RCC_D1CFGR_HPRE_DIVIDED) {
+ /* get D1 domain AHB prescaler */
+ idx = d1cfgr & RCC_D1CFGR_HPRE_DIVIDER;
+ sysclk = sysclk / prescaler_table[idx];
+ }
+
+ gate_offset = clk_map[clk->id].gate_offset;
+
+ debug("%s clk->id=%ld gate_offset=0x%x sysclk=%ld\n",
+ __func__, clk->id, gate_offset, sysclk);
+
+ switch (gate_offset) {
+ case RCC_AHB3ENR:
+ case RCC_AHB1ENR:
+ case RCC_AHB2ENR:
+ case RCC_AHB4ENR:
+ return sysclk;
+ break;
+
+ case RCC_APB3ENR:
+ if (d1cfgr & RCC_D1CFGR_D1PPRE_DIVIDED) {
+ /* get D1 domain APB3 prescaler */
+ idx = (d1cfgr & RCC_D1CFGR_D1PPRE_DIVIDER) >>
+ RCC_D1CFGR_D1PPRE_SHIFT;
+ sysclk = sysclk / prescaler_table[idx];
+ }
+
+ debug("%s system clock: freq after APB3 prescaler = %ld\n",
+ __func__, sysclk);
+
+ return sysclk;
+ break;
+
+ case RCC_APB4ENR:
+ if (d1cfgr & RCC_D3CFGR_D3PPRE_DIVIDED) {
+ /* get D3 domain APB4 prescaler */
+ idx = (d1cfgr & RCC_D3CFGR_D3PPRE_DIVIDER) >>
+ RCC_D3CFGR_D3PPRE_SHIFT;
+ sysclk = sysclk / prescaler_table[idx];
+ }
+
+ debug("%s system clock: freq after APB4 prescaler = %ld\n",
+ __func__, sysclk);
+
+ return sysclk;
+ break;
+
+ case RCC_APB1LENR:
+ case RCC_APB1HENR:
+ if (d1cfgr & RCC_D2CFGR_D2PPRE1_DIVIDED) {
+ /* get D2 domain APB1 prescaler */
+ idx = (d1cfgr & RCC_D2CFGR_D2PPRE1_DIVIDER) >>
+ RCC_D2CFGR_D2PPRE1_SHIFT;
+ sysclk = sysclk / prescaler_table[idx];
+ }
+
+ debug("%s system clock: freq after APB1 prescaler = %ld\n",
+ __func__, sysclk);
+
+ return sysclk;
+ break;
+
+ case RCC_APB2ENR:
+ if (d1cfgr & RCC_D2CFGR_D2PPRE2_DIVIDED) {
+ /* get D2 domain APB1 prescaler */
+ idx = (d1cfgr & RCC_D2CFGR_D2PPRE2_DIVIDER) >>
+ RCC_D2CFGR_D2PPRE2_SHIFT;
+ sysclk = sysclk / prescaler_table[idx];
+ }
+
+ debug("%s system clock: freq after APB2 prescaler = %ld\n",
+ __func__, sysclk);
+
+ return sysclk;
+ break;
+
+ default:
+ error("unexpected gate_offset value (0x%x)\n", gate_offset);
+ return -EINVAL;
+ break;
+ }
+}
+
+static int stm32_clk_enable(struct clk *clk)
+{
+ struct stm32_clk *priv = dev_get_priv(clk->dev);
+ struct stm32_rcc_regs *regs = priv->rcc_base;
+ u32 gate_offset;
+ u32 gate_bit_index;
+ unsigned long clk_id = clk->id;
+
+ gate_offset = clk_map[clk_id].gate_offset;
+ gate_bit_index = clk_map[clk_id].gate_bit_idx;
+
+ debug("%s: clkid=%ld gate offset=0x%x bit_index=%d name=%s\n",
+ __func__, clk->id, gate_offset, gate_bit_index,
+ clk_map[clk_id].name);
+
+ setbits_le32(®s->cr + (gate_offset / 4), BIT(gate_bit_index));
+
+ return 0;
+}
+
+static int stm32_clk_probe(struct udevice *dev)
+{
+ struct stm32_clk *priv = dev_get_priv(dev);
+ struct udevice *syscon;
+ fdt_addr_t addr;
+ int err;
+
+ addr = dev_read_addr(dev);
+ if (addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ priv->rcc_base = (struct stm32_rcc_regs *)addr;
+
+ /* get corresponding syscon phandle */
+ err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
+ "st,syscfg", &syscon);
+
+ if (err) {
+ error("unable to find syscon device\n");
+ return err;
+ }
+
+ priv->pwr_regmap = syscon_get_regmap(syscon);
+ if (!priv->pwr_regmap) {
+ error("unable to find regmap\n");
+ return -ENODEV;
+ }
+
+ configure_clocks(dev);
+
+ return 0;
+}
+
+static int stm32_clk_of_xlate(struct clk *clk,
+ struct ofnode_phandle_args *args)
+{
+ if (args->args_count != 1) {
+ debug("Invaild args_count: %d\n", args->args_count);
+ return -EINVAL;
+ }
+
+ if (args->args_count) {
+ clk->id = args->args[0];
+ /*
+ * this computation convert DT clock index which is used to
+ * point into 2 separate clock arrays (peripheral and kernel
+ * clocks bank) (see include/dt-bindings/clock/stm32h7-clks.h)
+ * into index to point into only one array where peripheral
+ * and kernel clocks are consecutive
+ */
+ if (clk->id >= KERN_BANK) {
+ clk->id -= KERN_BANK;
+ clk->id += LAST_PERIF_BANK - PERIF_BANK + 1;
+ } else {
+ clk->id -= PERIF_BANK;
+ }
+ } else {
+ clk->id = 0;
+ }
+
+ debug("%s clk->id %ld\n", __func__, clk->id);
+
+ return 0;
+}
+
+static struct clk_ops stm32_clk_ops = {
+ .of_xlate = stm32_clk_of_xlate,
+ .enable = stm32_clk_enable,
+ .get_rate = stm32_clk_get_rate,
+};
+
+U_BOOT_DRIVER(stm32h7_clk) = {
+ .name = "stm32h7_rcc_clock",
+ .id = UCLASS_CLK,
+ .ops = &stm32_clk_ops,
+ .probe = stm32_clk_probe,
+ .priv_auto_alloc_size = sizeof(struct stm32_clk),
+ .flags = DM_FLAG_PRE_RELOC,
+};