1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * 4 * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org> 5 * Copyright (C) 2013 John Crispin <john@phrozen.org> 6 */ 7 8#include <linux/kernel.h> 9#include <linux/init.h> 10#include <linux/export.h> 11#include <linux/clkdev.h> 12#include <linux/clk.h> 13 14#include <asm/time.h> 15 16#include "common.h" 17 18struct clk { 19 struct clk_lookup cl; 20 unsigned long rate; 21}; 22 23void ralink_clk_add(const char *dev, unsigned long rate) 24{ 25 struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL); 26 27 if (!clk) 28 panic("failed to add clock"); 29 30 clk->cl.dev_id = dev; 31 clk->cl.clk = clk; 32 33 clk->rate = rate; 34 35 clkdev_add(&clk->cl); 36} 37 38/* 39 * Linux clock API 40 */ 41int clk_enable(struct clk *clk) 42{ 43 return 0; 44} 45EXPORT_SYMBOL_GPL(clk_enable); 46 47void clk_disable(struct clk *clk) 48{ 49} 50EXPORT_SYMBOL_GPL(clk_disable); 51 52unsigned long clk_get_rate(struct clk *clk) 53{ 54 if (!clk) 55 return 0; 56 57 return clk->rate; 58} 59EXPORT_SYMBOL_GPL(clk_get_rate); 60 61int clk_set_rate(struct clk *clk, unsigned long rate) 62{ 63 return -1; 64} 65EXPORT_SYMBOL_GPL(clk_set_rate); 66 67long clk_round_rate(struct clk *clk, unsigned long rate) 68{ 69 return -1; 70} 71EXPORT_SYMBOL_GPL(clk_round_rate); 72 73void __init plat_time_init(void) 74{ 75 struct clk *clk; 76 77 ralink_of_remap(); 78 79 ralink_clk_init(); 80 clk = clk_get_sys("cpu", NULL); 81 if (IS_ERR(clk)) 82 panic("unable to get CPU clock, err=%ld", PTR_ERR(clk)); 83 pr_info("CPU Clock: %ldMHz\n", clk_get_rate(clk) / 1000000); 84 mips_hpt_frequency = clk_get_rate(clk) / 2; 85 clk_put(clk); 86 timer_probe(); 87} 88