99 lines
1.9 KiB
C
Executable File
99 lines
1.9 KiB
C
Executable File
/**
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CA9 global timer driver
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@file timer.c
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@ingroup
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@note
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Copyright Novatek Microelectronics Corp. 2019. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation.
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*/
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#include <common.h>
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#include <asm/armv7.h>
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#include <asm/io.h>
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#include <asm/arch-armv7/globaltimer.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/na51089_regs.h>
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#include <div64.h>
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DECLARE_GLOBAL_DATA_PTR;
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static struct globaltimer *global_timer = \
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(struct globaltimer *)GLOBAL_TIMER_BASE_ADDR;
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#define CLK2MHZ(clk) (clk / 1000 / 1000)
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u32 get_timer_clk(void)
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{
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return (get_cpu_clk() / 1000) / 8;
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}
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static u64 get_cpu_global_timer(void)
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{
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u32 low, high;
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u64 timer;
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u32 old = readl(&global_timer->cnt_h);
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while (1) {
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low = readl(&global_timer->cnt_l);
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high = readl(&global_timer->cnt_h);
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if (old == high)
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break;
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else
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old = high;
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}
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timer = high;
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return (u64)((timer << 32) | low);
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}
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int timer_init(void)
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{
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u32 val = 0;
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val = readl(&global_timer->ctl);
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if (!(val & 0x01)) {
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writel(0x01, &global_timer->ctl);
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printf("ARM CA9 global timer init successfully\n");
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} else {
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printf("ARM CA9 global timer had already been initiated\n");
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}
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return 0;
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}
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void __udelay(unsigned long usec)
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{
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u64 wait_tick = 0;
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unsigned long long now_tick, start = get_cpu_global_timer();
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wait_tick = get_timer_clk() * usec;
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do {
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now_tick = get_cpu_global_timer();
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} while ((now_tick - start) < wait_tick);
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}
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ulong get_timer(ulong base)
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{
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u64 now = get_cpu_global_timer(), timer_freq = get_timer_clk();
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ulong time_msec;
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do_div(now, timer_freq * 1000);
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time_msec = (ulong)now;
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return time_msec - base;
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}
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unsigned long long get_ticks(void)
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{
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return get_cpu_global_timer();
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}
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ulong get_tbclk(void)
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{
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return (ulong)get_timer_clk();
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}
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