119 lines
2.1 KiB
C
119 lines
2.1 KiB
C
/*
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* (C) Copyright 2015
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* Kamil Lulko, <rev13@wp.pl>
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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 <asm/io.h>
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#include <asm/armv7m.h>
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#include <asm/arch/stm32.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define STM32_TIM2_BASE (STM32_APB1PERIPH_BASE + 0x0000)
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#define RCC_APB1ENR_TIM2EN (1 << 0)
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struct stm32_tim2_5 {
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u32 cr1;
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u32 cr2;
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u32 smcr;
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u32 dier;
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u32 sr;
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u32 egr;
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u32 ccmr1;
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u32 ccmr2;
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u32 ccer;
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u32 cnt;
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u32 psc;
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u32 arr;
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u32 reserved1;
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u32 ccr1;
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u32 ccr2;
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u32 ccr3;
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u32 ccr4;
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u32 reserved2;
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u32 dcr;
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u32 dmar;
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u32 or;
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};
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#define TIM_CR1_CEN (1 << 0)
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#define TIM_EGR_UG (1 << 0)
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int timer_init(void)
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{
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struct stm32_tim2_5 *tim = (struct stm32_tim2_5 *)STM32_TIM2_BASE;
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setbits_le32(&STM32_RCC->apb1enr, RCC_APB1ENR_TIM2EN);
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if (clock_get(CLOCK_AHB) == clock_get(CLOCK_APB1))
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writel((clock_get(CLOCK_APB1) / CONFIG_SYS_HZ_CLOCK) - 1,
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&tim->psc);
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else
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writel(((clock_get(CLOCK_APB1) * 2) / CONFIG_SYS_HZ_CLOCK) - 1,
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&tim->psc);
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writel(0xFFFFFFFF, &tim->arr);
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writel(TIM_CR1_CEN, &tim->cr1);
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setbits_le32(&tim->egr, TIM_EGR_UG);
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gd->arch.tbl = 0;
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gd->arch.tbu = 0;
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gd->arch.lastinc = 0;
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return 0;
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}
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ulong get_timer(ulong base)
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{
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return (get_ticks() / (CONFIG_SYS_HZ_CLOCK / CONFIG_SYS_HZ)) - base;
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}
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unsigned long long get_ticks(void)
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{
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struct stm32_tim2_5 *tim = (struct stm32_tim2_5 *)STM32_TIM2_BASE;
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u32 now;
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now = readl(&tim->cnt);
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if (now >= gd->arch.lastinc)
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gd->arch.tbl += (now - gd->arch.lastinc);
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else
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gd->arch.tbl += (0xFFFFFFFF - gd->arch.lastinc) + now;
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gd->arch.lastinc = now;
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return gd->arch.tbl;
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}
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void reset_timer(void)
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{
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struct stm32_tim2_5 *tim = (struct stm32_tim2_5 *)STM32_TIM2_BASE;
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gd->arch.lastinc = readl(&tim->cnt);
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gd->arch.tbl = 0;
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}
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/* delay x useconds */
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void __udelay(ulong usec)
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{
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unsigned long long start;
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start = get_ticks(); /* get current timestamp */
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while ((get_ticks() - start) < usec)
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; /* loop till time has passed */
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}
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/*
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* This function is derived from PowerPC code (timebase clock frequency).
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* On ARM it returns the number of timer ticks per second.
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*/
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ulong get_tbclk(void)
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{
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return CONFIG_SYS_HZ_CLOCK;
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}
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