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 } 61