330 lines
8.4 KiB
C
330 lines
8.4 KiB
C
/*
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* (C) Copyright 2017
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* Vikas Manocha, <vikas.manocha@st.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <clk-uclass.h>
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#include <dm.h>
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#include <asm/io.h>
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#include <asm/arch/rcc.h>
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#include <asm/arch/stm32.h>
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#include <asm/arch/stm32_periph.h>
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#define RCC_CR_HSION BIT(0)
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#define RCC_CR_HSEON BIT(16)
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#define RCC_CR_HSERDY BIT(17)
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#define RCC_CR_HSEBYP BIT(18)
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#define RCC_CR_CSSON BIT(19)
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#define RCC_CR_PLLON BIT(24)
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#define RCC_CR_PLLRDY BIT(25)
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#define RCC_PLLCFGR_PLLM_MASK GENMASK(5, 0)
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#define RCC_PLLCFGR_PLLN_MASK GENMASK(14, 6)
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#define RCC_PLLCFGR_PLLP_MASK GENMASK(17, 16)
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#define RCC_PLLCFGR_PLLQ_MASK GENMASK(27, 24)
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#define RCC_PLLCFGR_PLLSRC BIT(22)
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#define RCC_PLLCFGR_PLLM_SHIFT 0
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#define RCC_PLLCFGR_PLLN_SHIFT 6
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#define RCC_PLLCFGR_PLLP_SHIFT 16
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#define RCC_PLLCFGR_PLLQ_SHIFT 24
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#define RCC_CFGR_AHB_PSC_MASK GENMASK(7, 4)
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#define RCC_CFGR_APB1_PSC_MASK GENMASK(12, 10)
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#define RCC_CFGR_APB2_PSC_MASK GENMASK(15, 13)
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#define RCC_CFGR_SW0 BIT(0)
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#define RCC_CFGR_SW1 BIT(1)
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#define RCC_CFGR_SW_MASK GENMASK(1, 0)
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#define RCC_CFGR_SW_HSI 0
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#define RCC_CFGR_SW_HSE RCC_CFGR_SW0
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#define RCC_CFGR_SW_PLL RCC_CFGR_SW1
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#define RCC_CFGR_SWS0 BIT(2)
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#define RCC_CFGR_SWS1 BIT(3)
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#define RCC_CFGR_SWS_MASK GENMASK(3, 2)
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#define RCC_CFGR_SWS_HSI 0
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#define RCC_CFGR_SWS_HSE RCC_CFGR_SWS0
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#define RCC_CFGR_SWS_PLL RCC_CFGR_SWS1
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#define RCC_CFGR_HPRE_SHIFT 4
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#define RCC_CFGR_PPRE1_SHIFT 10
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#define RCC_CFGR_PPRE2_SHIFT 13
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/*
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* Offsets of some PWR registers
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*/
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#define PWR_CR1_ODEN BIT(16)
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#define PWR_CR1_ODSWEN BIT(17)
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#define PWR_CSR1_ODRDY BIT(16)
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#define PWR_CSR1_ODSWRDY BIT(17)
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struct pll_psc {
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u8 pll_m;
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u16 pll_n;
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u8 pll_p;
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u8 pll_q;
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u8 ahb_psc;
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u8 apb1_psc;
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u8 apb2_psc;
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};
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#define AHB_PSC_1 0
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#define AHB_PSC_2 0x8
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#define AHB_PSC_4 0x9
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#define AHB_PSC_8 0xA
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#define AHB_PSC_16 0xB
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#define AHB_PSC_64 0xC
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#define AHB_PSC_128 0xD
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#define AHB_PSC_256 0xE
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#define AHB_PSC_512 0xF
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#define APB_PSC_1 0
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#define APB_PSC_2 0x4
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#define APB_PSC_4 0x5
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#define APB_PSC_8 0x6
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#define APB_PSC_16 0x7
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#if !defined(CONFIG_STM32_HSE_HZ)
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#error "CONFIG_STM32_HSE_HZ not defined!"
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#else
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#if (CONFIG_STM32_HSE_HZ == 25000000)
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#if (CONFIG_SYS_CLK_FREQ == 200000000)
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/* 200 MHz */
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struct pll_psc sys_pll_psc = {
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.pll_m = 25,
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.pll_n = 400,
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.pll_p = 2,
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.pll_q = 8,
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.ahb_psc = AHB_PSC_1,
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.apb1_psc = APB_PSC_4,
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.apb2_psc = APB_PSC_2
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};
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#endif
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#else
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#error "No PLL/Prescaler configuration for given CONFIG_STM32_HSE_HZ exists"
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#endif
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#endif
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int configure_clocks(void)
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{
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/* Reset RCC configuration */
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setbits_le32(&STM32_RCC->cr, RCC_CR_HSION);
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writel(0, &STM32_RCC->cfgr); /* Reset CFGR */
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clrbits_le32(&STM32_RCC->cr, (RCC_CR_HSEON | RCC_CR_CSSON
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| RCC_CR_PLLON));
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writel(0x24003010, &STM32_RCC->pllcfgr); /* Reset value from RM */
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clrbits_le32(&STM32_RCC->cr, RCC_CR_HSEBYP);
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writel(0, &STM32_RCC->cir); /* Disable all interrupts */
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/* Configure for HSE+PLL operation */
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setbits_le32(&STM32_RCC->cr, RCC_CR_HSEON);
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while (!(readl(&STM32_RCC->cr) & RCC_CR_HSERDY))
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;
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setbits_le32(&STM32_RCC->cfgr, ((
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sys_pll_psc.ahb_psc << RCC_CFGR_HPRE_SHIFT)
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| (sys_pll_psc.apb1_psc << RCC_CFGR_PPRE1_SHIFT)
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| (sys_pll_psc.apb2_psc << RCC_CFGR_PPRE2_SHIFT)));
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/* Configure the main PLL */
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uint32_t pllcfgr = 0;
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pllcfgr = RCC_PLLCFGR_PLLSRC; /* pll source HSE */
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pllcfgr |= sys_pll_psc.pll_m << RCC_PLLCFGR_PLLM_SHIFT;
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pllcfgr |= sys_pll_psc.pll_n << RCC_PLLCFGR_PLLN_SHIFT;
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pllcfgr |= ((sys_pll_psc.pll_p >> 1) - 1) << RCC_PLLCFGR_PLLP_SHIFT;
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pllcfgr |= sys_pll_psc.pll_q << RCC_PLLCFGR_PLLQ_SHIFT;
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writel(pllcfgr, &STM32_RCC->pllcfgr);
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/* Enable the main PLL */
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setbits_le32(&STM32_RCC->cr, RCC_CR_PLLON);
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while (!(readl(&STM32_RCC->cr) & RCC_CR_PLLRDY))
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;
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/* Enable high performance mode, System frequency up to 200 MHz */
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setbits_le32(&STM32_RCC->apb1enr, RCC_APB1ENR_PWREN);
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setbits_le32(&STM32_PWR->cr1, PWR_CR1_ODEN);
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/* Infinite wait! */
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while (!(readl(&STM32_PWR->csr1) & PWR_CSR1_ODRDY))
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;
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/* Enable the Over-drive switch */
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setbits_le32(&STM32_PWR->cr1, PWR_CR1_ODSWEN);
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/* Infinite wait! */
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while (!(readl(&STM32_PWR->csr1) & PWR_CSR1_ODSWRDY))
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;
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stm32_flash_latency_cfg(5);
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clrbits_le32(&STM32_RCC->cfgr, (RCC_CFGR_SW0 | RCC_CFGR_SW1));
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setbits_le32(&STM32_RCC->cfgr, RCC_CFGR_SW_PLL);
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while ((readl(&STM32_RCC->cfgr) & RCC_CFGR_SWS_MASK) !=
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RCC_CFGR_SWS_PLL)
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;
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return 0;
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}
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unsigned long clock_get(enum clock clck)
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{
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u32 sysclk = 0;
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u32 shift = 0;
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/* Prescaler table lookups for clock computation */
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u8 ahb_psc_table[16] = {
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0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9
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};
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u8 apb_psc_table[8] = {
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0, 0, 0, 0, 1, 2, 3, 4
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};
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if ((readl(&STM32_RCC->cfgr) & RCC_CFGR_SWS_MASK) ==
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RCC_CFGR_SWS_PLL) {
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u16 pllm, plln, pllp;
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pllm = (readl(&STM32_RCC->pllcfgr) & RCC_PLLCFGR_PLLM_MASK);
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plln = ((readl(&STM32_RCC->pllcfgr) & RCC_PLLCFGR_PLLN_MASK)
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>> RCC_PLLCFGR_PLLN_SHIFT);
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pllp = ((((readl(&STM32_RCC->pllcfgr) & RCC_PLLCFGR_PLLP_MASK)
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>> RCC_PLLCFGR_PLLP_SHIFT) + 1) << 1);
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sysclk = ((CONFIG_STM32_HSE_HZ / pllm) * plln) / pllp;
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}
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switch (clck) {
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case CLOCK_CORE:
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return sysclk;
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break;
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case CLOCK_AHB:
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shift = ahb_psc_table[(
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(readl(&STM32_RCC->cfgr) & RCC_CFGR_AHB_PSC_MASK)
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>> RCC_CFGR_HPRE_SHIFT)];
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return sysclk >>= shift;
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break;
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case CLOCK_APB1:
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shift = apb_psc_table[(
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(readl(&STM32_RCC->cfgr) & RCC_CFGR_APB1_PSC_MASK)
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>> RCC_CFGR_PPRE1_SHIFT)];
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return sysclk >>= shift;
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break;
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case CLOCK_APB2:
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shift = apb_psc_table[(
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(readl(&STM32_RCC->cfgr) & RCC_CFGR_APB2_PSC_MASK)
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>> RCC_CFGR_PPRE2_SHIFT)];
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return sysclk >>= shift;
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break;
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default:
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return 0;
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break;
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}
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}
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static int stm32_clk_enable(struct clk *clk)
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{
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u32 offset = clk->id / 32;
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u32 bit_index = clk->id % 32;
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debug("%s: clkid = %ld, offset from AHB1ENR is %d, bit_index = %d\n",
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__func__, clk->id, offset, bit_index);
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setbits_le32(&STM32_RCC->ahb1enr + offset, BIT(bit_index));
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return 0;
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}
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void clock_setup(int peripheral)
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{
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switch (peripheral) {
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case GPIO_A_CLOCK_CFG:
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setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_A_EN);
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break;
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case GPIO_B_CLOCK_CFG:
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setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_B_EN);
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break;
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case GPIO_C_CLOCK_CFG:
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setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_C_EN);
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break;
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case GPIO_D_CLOCK_CFG:
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setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_D_EN);
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break;
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case GPIO_E_CLOCK_CFG:
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setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_E_EN);
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break;
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case GPIO_F_CLOCK_CFG:
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setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_F_EN);
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break;
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case GPIO_G_CLOCK_CFG:
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setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_G_EN);
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break;
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case GPIO_H_CLOCK_CFG:
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setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_H_EN);
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break;
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case GPIO_I_CLOCK_CFG:
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setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_I_EN);
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break;
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case GPIO_J_CLOCK_CFG:
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setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_J_EN);
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break;
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case GPIO_K_CLOCK_CFG:
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setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_K_EN);
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break;
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case SYSCFG_CLOCK_CFG:
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setbits_le32(&STM32_RCC->apb2enr, RCC_APB2ENR_SYSCFGEN);
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break;
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case TIMER2_CLOCK_CFG:
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setbits_le32(&STM32_RCC->apb1enr, RCC_APB1ENR_TIM2EN);
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break;
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case FMC_CLOCK_CFG:
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setbits_le32(&STM32_RCC->ahb3enr, RCC_AHB3ENR_FMC_EN);
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break;
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case STMMAC_CLOCK_CFG:
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setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_ETHMAC_EN);
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setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_ETHMAC_RX_EN);
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setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_ETHMAC_TX_EN);
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break;
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case QSPI_CLOCK_CFG:
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setbits_le32(&STM32_RCC->ahb3enr, RCC_AHB3ENR_QSPI_EN);
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break;
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default:
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break;
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}
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}
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static int stm32_clk_probe(struct udevice *dev)
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{
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debug("%s: stm32_clk_probe\n", __func__);
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configure_clocks();
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return 0;
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}
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static int stm32_clk_of_xlate(struct clk *clk,
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struct fdtdec_phandle_args *args)
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{
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debug("%s(clk=%p)\n", __func__, clk);
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if (args->args_count != 2) {
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debug("Invaild args_count: %d\n", args->args_count);
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return -EINVAL;
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}
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if (args->args_count)
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clk->id = args->args[1];
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else
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clk->id = 0;
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return 0;
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}
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static struct clk_ops stm32_clk_ops = {
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.of_xlate = stm32_clk_of_xlate,
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.enable = stm32_clk_enable,
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};
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static const struct udevice_id stm32_clk_ids[] = {
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{ .compatible = "st,stm32f42xx-rcc"},
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{}
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};
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U_BOOT_DRIVER(stm32f7_clk) = {
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.name = "stm32f7_clk",
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.id = UCLASS_CLK,
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.of_match = stm32_clk_ids,
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.ops = &stm32_clk_ops,
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.probe = stm32_clk_probe,
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.flags = DM_FLAG_PRE_RELOC,
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};
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