1 /* 2 * Device Tree support for Mediatek SoCs 3 * 4 * Copyright (c) 2014 MundoReader S.L. 5 * Author: Matthias Brugger <matthias.bgg@gmail.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 #include <linux/init.h> 18 #include <asm/mach/arch.h> 19 #include <linux/of.h> 20 #include <linux/clk-provider.h> 21 #include <linux/clocksource.h> 22 23 24 #define GPT6_CON_MT65xx 0x10008060 25 #define GPT_ENABLE 0x31 26 27 static void __init mediatek_timer_init(void) 28 { 29 void __iomem *gpt_base; 30 31 if (of_machine_is_compatible("mediatek,mt6589") || 32 of_machine_is_compatible("mediatek,mt8135") || 33 of_machine_is_compatible("mediatek,mt8127")) { 34 /* turn on GPT6 which ungates arch timer clocks */ 35 gpt_base = ioremap(GPT6_CON_MT65xx, 0x04); 36 37 /* enable clock and set to free-run */ 38 writel(GPT_ENABLE, gpt_base); 39 iounmap(gpt_base); 40 } 41 42 of_clk_init(NULL); 43 clocksource_probe(); 44 }; 45 46 static const char * const mediatek_board_dt_compat[] = { 47 "mediatek,mt6589", 48 "mediatek,mt6592", 49 "mediatek,mt8127", 50 "mediatek,mt8135", 51 NULL, 52 }; 53 54 DT_MACHINE_START(MEDIATEK_DT, "Mediatek Cortex-A7 (Device Tree)") 55 .dt_compat = mediatek_board_dt_compat, 56 .init_time = mediatek_timer_init, 57 MACHINE_END 58