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 18 struct clk { 19 struct clk_lookup cl; 20 unsigned long rate; 21 }; 22 23 void 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 */ 41 int clk_enable(struct clk *clk) 42 { 43 return 0; 44 } 45 EXPORT_SYMBOL_GPL(clk_enable); 46 47 void clk_disable(struct clk *clk) 48 { 49 } 50 EXPORT_SYMBOL_GPL(clk_disable); 51 52 unsigned long clk_get_rate(struct clk *clk) 53 { 54 if (!clk) 55 return 0; 56 57 return clk->rate; 58 } 59 EXPORT_SYMBOL_GPL(clk_get_rate); 60 61 int clk_set_rate(struct clk *clk, unsigned long rate) 62 { 63 return -1; 64 } 65 EXPORT_SYMBOL_GPL(clk_set_rate); 66 67 long clk_round_rate(struct clk *clk, unsigned long rate) 68 { 69 return -1; 70 } 71 EXPORT_SYMBOL_GPL(clk_round_rate); 72 73 void __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