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 <linux/io.h> 19 #include <asm/mach/arch.h> 20 #include <linux/of.h> 21 #include <linux/clk-provider.h> 22 #include <linux/clocksource.h> 23 24 25 #define GPT6_CON_MT65xx 0x10008060 26 #define GPT_ENABLE 0x31 27 28 static void __init mediatek_timer_init(void) 29 { 30 void __iomem *gpt_base; 31 32 if (of_machine_is_compatible("mediatek,mt6589") || 33 of_machine_is_compatible("mediatek,mt7623") || 34 of_machine_is_compatible("mediatek,mt8135") || 35 of_machine_is_compatible("mediatek,mt8127")) { 36 /* turn on GPT6 which ungates arch timer clocks */ 37 gpt_base = ioremap(GPT6_CON_MT65xx, 0x04); 38 39 /* enable clock and set to free-run */ 40 writel(GPT_ENABLE, gpt_base); 41 iounmap(gpt_base); 42 } 43 44 of_clk_init(NULL); 45 timer_probe(); 46 }; 47 48 static const char * const mediatek_board_dt_compat[] = { 49 "mediatek,mt2701", 50 "mediatek,mt6589", 51 "mediatek,mt6592", 52 "mediatek,mt7623", 53 "mediatek,mt7629", 54 "mediatek,mt8127", 55 "mediatek,mt8135", 56 NULL, 57 }; 58 59 DT_MACHINE_START(MEDIATEK_DT, "Mediatek Cortex-A7 (Device Tree)") 60 .dt_compat = mediatek_board_dt_compat, 61 .init_time = mediatek_timer_init, 62 MACHINE_END 63