1 /* 2 * Pistachio clocksource/timer setup 3 * 4 * Copyright (C) 2014 Google, Inc. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2, as published by the Free Software Foundation. 9 */ 10 11 #include <linux/clk.h> 12 #include <linux/clk-provider.h> 13 #include <linux/clocksource.h> 14 #include <linux/init.h> 15 #include <linux/irqchip/mips-gic.h> 16 #include <linux/of.h> 17 18 #include <asm/time.h> 19 get_c0_compare_int(void)20 unsigned int get_c0_compare_int(void) 21 { 22 return gic_get_c0_compare_int(); 23 } 24 get_c0_perfcount_int(void)25 int get_c0_perfcount_int(void) 26 { 27 return gic_get_c0_perfcount_int(); 28 } 29 EXPORT_SYMBOL_GPL(get_c0_perfcount_int); 30 get_c0_fdc_int(void)31 int get_c0_fdc_int(void) 32 { 33 return gic_get_c0_fdc_int(); 34 } 35 plat_time_init(void)36 void __init plat_time_init(void) 37 { 38 struct device_node *np; 39 struct clk *clk; 40 41 of_clk_init(NULL); 42 clocksource_probe(); 43 44 np = of_get_cpu_node(0, NULL); 45 if (!np) { 46 pr_err("Failed to get CPU node\n"); 47 return; 48 } 49 50 clk = of_clk_get(np, 0); 51 if (IS_ERR(clk)) { 52 pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk)); 53 return; 54 } 55 56 mips_hpt_frequency = clk_get_rate(clk) / 2; 57 clk_put(clk); 58 } 59