LXR uboot/arch/arm/mach-mvebu/timer.c

   1/*
   2 * Copyright (C) Marvell International Ltd. and its affiliates
   3 * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
   4 *
   5 * Copyright (C) 2015 Stefan Roese <sr@denx.de>
   6 *
   7 * SPDX-License-Identifier:     GPL-2.0+
   8 */
   9
  10#include <common.h>
  11#include <asm/io.h>
  12#include <asm/arch/soc.h>
  13
  14DECLARE_GLOBAL_DATA_PTR;
  15
  16#define TIMER_LOAD_VAL                  0xffffffff
  17
  18static int init_done __attribute__((section(".data"))) = 0;
  19
  20/*
  21 * Timer initialization
  22 */
  23int timer_init(void)
  24{
  25        /* Only init the timer once */
  26        if (init_done)
  27                return 0;
  28        init_done = 1;
  29
  30        /* load value into timer */
  31        writel(TIMER_LOAD_VAL, MVEBU_TIMER_BASE + 0x10);
  32        writel(TIMER_LOAD_VAL, MVEBU_TIMER_BASE + 0x14);
  33
  34#if defined(CONFIG_ARCH_MVEBU)
  35        /* On Armada XP / 38x ..., the 25MHz clock source needs to be enabled */
  36        setbits_le32(MVEBU_TIMER_BASE + 0x00, BIT(11));
  37#endif
  38        /* enable timer in auto reload mode */
  39        setbits_le32(MVEBU_TIMER_BASE + 0x00, 0x3);
  40
  41        return 0;
  42}
  43