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