Add system counter driver for imx7d and mx6ul imx7 and imx6ul supports system counter timer as well as GPT timer (arch/arm/imx-common/timer.c); The default for imx7 is systemcounter timer.
Signed-off-by: Adrian Alonso aalonso@freescale.com Signed-off-by: Ye.Li B37916@freescale.com --- Changes for V2 to V5: Resend Changes for V6: - Update comiit log description - Drop change set on mx6_common.h
arch/arm/imx-common/syscounter.c | 126 +++++++++++++++++++++++++++ arch/arm/include/asm/imx-common/syscounter.h | 29 ++++++ 2 files changed, 155 insertions(+) create mode 100644 arch/arm/imx-common/syscounter.c create mode 100644 arch/arm/include/asm/imx-common/syscounter.h
diff --git a/arch/arm/imx-common/syscounter.c b/arch/arm/imx-common/syscounter.c new file mode 100644 index 0000000..e00fef2 --- /dev/null +++ b/arch/arm/imx-common/syscounter.c @@ -0,0 +1,126 @@ +/* + * Copyright (C) 2015 Freescale Semiconductor, Inc. + * + * SPDX-License-Identifier: GPL-2.0+ + * + * The file use ls102xa/timer.c as a reference. + */ + +#include <common.h> +#include <asm/io.h> +#include <div64.h> +#include <asm/arch/imx-regs.h> +#include <asm/arch/sys_proto.h> +#include <asm/imx-common/syscounter.h> + +DECLARE_GLOBAL_DATA_PTR; + +/* + * This function is intended for SHORT delays only. + * It will overflow at around 10 seconds @ 400MHz, + * or 20 seconds @ 200MHz. + */ +unsigned long usec2ticks(unsigned long usec) +{ + ulong ticks; + + if (usec < 1000) + ticks = ((usec * (get_tbclk()/1000)) + 500) / 1000; + else + ticks = ((usec / 10) * (get_tbclk() / 100000)); + + return ticks; +} + +static inline unsigned long long tick_to_time(unsigned long long tick) +{ + unsigned long freq; + + asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (freq)); + + tick *= CONFIG_SYS_HZ; + do_div(tick, freq); + + return tick; +} + +static inline unsigned long long us_to_tick(unsigned long long usec) +{ + unsigned long freq; + + asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (freq)); + + usec = usec * freq + 999999; + do_div(usec, 1000000); + + return usec; +} + +int timer_init(void) +{ + struct sctr_regs *sctr = (struct sctr_regs *)SCTR_BASE_ADDR; + unsigned long val, freq; + + freq = CONFIG_SC_TIMER_CLK; + asm("mcr p15, 0, %0, c14, c0, 0" : : "r" (freq)); + + writel(freq, &sctr->cntfid0); + + /* Enable system counter */ + val = readl(&sctr->cntcr); + val &= ~(SC_CNTCR_FREQ0 | SC_CNTCR_FREQ1); + val |= SC_CNTCR_FREQ0 | SC_CNTCR_ENABLE | SC_CNTCR_HDBG; + writel(val, &sctr->cntcr); + + gd->arch.tbl = 0; + gd->arch.tbu = 0; + + return 0; +} + +unsigned long long get_ticks(void) +{ + unsigned long long now; + + asm("mrrc p15, 0, %Q0, %R0, c14" : "=r" (now)); + + gd->arch.tbl = (unsigned long)(now & 0xffffffff); + gd->arch.tbu = (unsigned long)(now >> 32); + + return now; +} + +ulong get_timer_masked(void) +{ + return tick_to_time(get_ticks()); +} + +ulong get_timer(ulong base) +{ + return get_timer_masked() - base; +} + +void __udelay(unsigned long usec) +{ + unsigned long long tmp; + ulong tmo; + + tmo = us_to_tick(usec); + tmp = get_ticks() + tmo; /* get current timestamp */ + + while (get_ticks() < tmp) /* loop till event */ + /*NOP*/; +} + +/* + * This function is derived from PowerPC code (timebase clock frequency). + * On ARM it returns the number of timer ticks per second. + */ +ulong get_tbclk(void) +{ + unsigned long freq; + + asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (freq)); + + return freq; +} diff --git a/arch/arm/include/asm/imx-common/syscounter.h b/arch/arm/include/asm/imx-common/syscounter.h new file mode 100644 index 0000000..bdbe26c --- /dev/null +++ b/arch/arm/include/asm/imx-common/syscounter.h @@ -0,0 +1,29 @@ +/* + * Copyright (C) 2015 Freescale Semiconductor, Inc. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _ASM_ARCH_SYSTEM_COUNTER_H +#define _ASM_ARCH_SYSTEM_COUNTER_H + +/* System Counter */ +struct sctr_regs { + u32 cntcr; + u32 cntsr; + u32 cntcv1; + u32 cntcv2; + u32 resv1[4]; + u32 cntfid0; + u32 cntfid1; + u32 cntfid2; + u32 resv2[1001]; + u32 counterid[1]; +}; + +#define SC_CNTCR_ENABLE (1 << 0) +#define SC_CNTCR_HDBG (1 << 1) +#define SC_CNTCR_FREQ0 (1 << 8) +#define SC_CNTCR_FREQ1 (1 << 9) + +#endif