1 /* 2 * Device Tree support for Rockchip SoCs 3 * 4 * Copyright (c) 2013 MundoReader S.L. 5 * Author: Heiko Stuebner <heiko@sntech.de> 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 18 #include <linux/kernel.h> 19 #include <linux/init.h> 20 #include <linux/of_platform.h> 21 #include <linux/irqchip.h> 22 #include <linux/clk-provider.h> 23 #include <linux/clocksource.h> 24 #include <linux/mfd/syscon.h> 25 #include <linux/regmap.h> 26 #include <asm/mach/arch.h> 27 #include <asm/mach/map.h> 28 #include <asm/hardware/cache-l2x0.h> 29 #include "core.h" 30 31 #define RK3288_GRF_SOC_CON0 0x244 32 33 static void __init rockchip_timer_init(void) 34 { 35 if (of_machine_is_compatible("rockchip,rk3288")) { 36 struct regmap *grf; 37 38 /* 39 * Disable auto jtag/sdmmc switching that causes issues 40 * with the mmc controllers making them unreliable 41 */ 42 grf = syscon_regmap_lookup_by_compatible("rockchip,rk3288-grf"); 43 if (!IS_ERR(grf)) 44 regmap_write(grf, RK3288_GRF_SOC_CON0, 0x10000000); 45 else 46 pr_err("rockchip: could not get grf syscon\n"); 47 } 48 49 of_clk_init(NULL); 50 clocksource_of_init(); 51 } 52 53 static void __init rockchip_dt_init(void) 54 { 55 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 56 platform_device_register_simple("cpufreq-dt", 0, NULL, 0); 57 } 58 59 static const char * const rockchip_board_dt_compat[] = { 60 "rockchip,rk2928", 61 "rockchip,rk3066a", 62 "rockchip,rk3066b", 63 "rockchip,rk3188", 64 "rockchip,rk3288", 65 NULL, 66 }; 67 68 DT_MACHINE_START(ROCKCHIP_DT, "Rockchip Cortex-A9 (Device Tree)") 69 .l2c_aux_val = 0, 70 .l2c_aux_mask = ~0, 71 .init_time = rockchip_timer_init, 72 .dt_compat = rockchip_board_dt_compat, 73 .init_machine = rockchip_dt_init, 74 MACHINE_END 75