1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Device Tree support for Mediatek SoCs 4 * 5 * Copyright (c) 2014 MundoReader S.L. 6 * Author: Matthias Brugger <matthias.bgg@gmail.com> 7 */ 8 #include <linux/init.h> 9 #include <linux/io.h> 10 #include <asm/mach/arch.h> 11 #include <linux/of.h> 12 #include <linux/of_clk.h> 13 #include <linux/clocksource.h> 14 15 16 #define GPT6_CON_MT65xx 0x10008060 17 #define GPT_ENABLE 0x31 18 19 static void __init mediatek_timer_init(void) 20 { 21 void __iomem *gpt_base; 22 23 if (of_machine_is_compatible("mediatek,mt6589") || 24 of_machine_is_compatible("mediatek,mt7623") || 25 of_machine_is_compatible("mediatek,mt8135") || 26 of_machine_is_compatible("mediatek,mt8127")) { 27 /* turn on GPT6 which ungates arch timer clocks */ 28 gpt_base = ioremap(GPT6_CON_MT65xx, 0x04); 29 30 /* enable clock and set to free-run */ 31 writel(GPT_ENABLE, gpt_base); 32 iounmap(gpt_base); 33 } 34 35 of_clk_init(NULL); 36 timer_probe(); 37 }; 38 39 static const char * const mediatek_board_dt_compat[] = { 40 "mediatek,mt2701", 41 "mediatek,mt6589", 42 "mediatek,mt6592", 43 "mediatek,mt7623", 44 "mediatek,mt7629", 45 "mediatek,mt8127", 46 "mediatek,mt8135", 47 NULL, 48 }; 49 50 DT_MACHINE_START(MEDIATEK_DT, "Mediatek Cortex-A7 (Device Tree)") 51 .dt_compat = mediatek_board_dt_compat, 52 .init_time = mediatek_timer_init, 53 MACHINE_END 54