arch/mips/jz4740/timer.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
   4  *  JZ4740 platform timer support
   5  */
   6
   7 #include <linux/export.h>
   8 #include <linux/io.h>
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11
  12 #include <asm/mach-jz4740/base.h>
  13 #include <asm/mach-jz4740/timer.h>
  14
  15 void __iomem *jz4740_timer_base;
  16 EXPORT_SYMBOL_GPL(jz4740_timer_base);
  17
  18 void jz4740_timer_enable_watchdog(void)
  19 {
  20         writel(BIT(16), jz4740_timer_base + JZ_REG_TIMER_STOP_CLEAR);
  21 }
  22 EXPORT_SYMBOL_GPL(jz4740_timer_enable_watchdog);
  23
  24 void jz4740_timer_disable_watchdog(void)
  25 {
  26         writel(BIT(16), jz4740_timer_base + JZ_REG_TIMER_STOP_SET);
  27 }
  28 EXPORT_SYMBOL_GPL(jz4740_timer_disable_watchdog);
  29
  30 void __init jz4740_timer_init(void)
  31 {
  32         jz4740_timer_base = ioremap(JZ4740_TCU_BASE_ADDR, 0x100);
  33
  34         if (!jz4740_timer_base)
  35                 panic("Failed to ioremap timer registers");
  36
  37         /* Disable all timer clocks except for those used as system timers */
  38         writel(0x000100fc, jz4740_timer_base + JZ_REG_TIMER_STOP_SET);
  39
  40         /* Timer irqs are unmasked by default, mask them */
  41         writel(0x00ff00ff, jz4740_timer_base + JZ_REG_TIMER_MASK_SET);
  42 }