arch/mips/pic32/pic32mzda/time.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Joshua Henderson <joshua.henderson@microchip.com>
   4  * Copyright (C) 2015 Microchip Technology Inc.  All rights reserved.
   5  */
   6 #include <linux/clocksource.h>
   7 #include <linux/init.h>
   8 #include <linux/irqdomain.h>
   9 #include <linux/of.h>
  10 #include <linux/of_clk.h>
  11 #include <linux/of_irq.h>
  12
  13 #include <asm/time.h>
  14
  15 #include "pic32mzda.h"
  16
  17 static const struct of_device_id pic32_infra_match[] = {
  18         { .compatible = "microchip,pic32mzda-infra", },
  19         { },
  20 };
  21
  22 #define DEFAULT_CORE_TIMER_INTERRUPT 0
  23
  24 static unsigned int pic32_xlate_core_timer_irq(void)
  25 {
  26         struct device_node *node;
  27         unsigned int irq;
  28
  29         node = of_find_matching_node(NULL, pic32_infra_match);
  30
  31         if (WARN_ON(!node))
  32                 goto default_map;
  33
  34         irq = irq_of_parse_and_map(node, 0);
  35         if (!irq)
  36                 goto default_map;
  37
  38         return irq;
  39
  40 default_map:
  41
  42         return irq_create_mapping(NULL, DEFAULT_CORE_TIMER_INTERRUPT);
  43 }
  44
  45 unsigned int get_c0_compare_int(void)
  46 {
  47         return pic32_xlate_core_timer_irq();
  48 }
  49
  50 void __init plat_time_init(void)
  51 {
  52         unsigned long rate = pic32_get_pbclk(7);
  53
  54         of_clk_init(NULL);
  55
  56         pr_info("CPU Clock: %ldMHz\n", rate / 1000000);
  57         mips_hpt_frequency = rate / 2;
  58
  59         timer_probe();
  60 }