arch/arm/mach-rockchip/rockchip.c

   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