LXR uboot/arch/arm/cpu/arm926ejs/lpc32xx/timer.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2011 Vladimir Zapolskiy <vz@mleia.com>
   4 */
   5
   6#include <common.h>
   7#include <asm/arch/cpu.h>
   8#include <asm/arch/clk.h>
   9#include <asm/arch/timer.h>
  10#include <asm/io.h>
  11
  12static struct timer_regs  *timer0 = (struct timer_regs *)TIMER0_BASE;
  13static struct timer_regs  *timer1 = (struct timer_regs *)TIMER1_BASE;
  14static struct clk_pm_regs *clk    = (struct clk_pm_regs *)CLK_PM_BASE;
  15
  16static void lpc32xx_timer_clock(u32 bit, int enable)
  17{
  18        if (enable)
  19                setbits_le32(&clk->timclk_ctrl1, bit);
  20        else
  21                clrbits_le32(&clk->timclk_ctrl1, bit);
  22}
  23
  24static void lpc32xx_timer_reset(struct timer_regs *timer, u32 freq)
  25{
  26        writel(TIMER_TCR_COUNTER_RESET,   &timer->tcr);
  27        writel(TIMER_TCR_COUNTER_DISABLE, &timer->tcr);
  28        writel(0, &timer->tc);
  29        writel(0, &timer->pr);
  30
  31        /* Count mode is every rising PCLK edge */
  32        writel(TIMER_CTCR_MODE_TIMER, &timer->ctcr);
  33
  34        /* Set prescale counter value */
  35        writel((get_periph_clk_rate() / freq) - 1, &timer->pr);
  36}
  37
  38static void lpc32xx_timer_count(struct timer_regs *timer, int enable)
  39{
  40        if (enable)
  41                writel(TIMER_TCR_COUNTER_ENABLE,  &timer->tcr);
  42        else
  43                writel(TIMER_TCR_COUNTER_DISABLE, &timer->tcr);
  44}
  45
  46int timer_init(void)
  47{
  48        lpc32xx_timer_clock(CLK_TIMCLK_TIMER0, 1);
  49        lpc32xx_timer_reset(timer0, CONFIG_SYS_HZ);
  50        lpc32xx_timer_count(timer0, 1);
  51
  52        return 0;
  53}
  54
  55ulong get_timer(ulong base)
  56{
  57        return readl(&timer0->tc) - base;
  58}
  59
  60void __udelay(unsigned long usec)
  61{
  62        lpc32xx_timer_clock(CLK_TIMCLK_TIMER1, 1);
  63        lpc32xx_timer_reset(timer1, CONFIG_SYS_HZ * 1000);
  64        lpc32xx_timer_count(timer1, 1);
  65
  66        while (readl(&timer1->tc) < usec)
  67                /* NOP */;
  68
  69        lpc32xx_timer_count(timer1, 0);
  70        lpc32xx_timer_clock(CLK_TIMCLK_TIMER1, 0);
  71}
  72
  73unsigned long long get_ticks(void)
  74{
  75        return get_timer(0);
  76}
  77
  78ulong get_tbclk(void)
  79{
  80        return CONFIG_SYS_HZ;
  81}
  82