2 * Device Tree support for Rockchip SoCs
4 * Copyright (c) 2013 MundoReader S.L.
5 * Author: Heiko Stuebner <heiko@sntech.de>
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.
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.
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>
32 #define RK3288_GRF_SOC_CON0 0x244
33 #define RK3288_GRF_SOC_CON2 0x24C
34 #define RK3288_TIMER6_7_PHYS 0xff810000
36 static void __init rockchip_timer_init(void)
38 if (of_machine_is_compatible("rockchip,rk3288")) {
40 void __iomem *reg_base;
43 * Most/all uboot versions for rk3288 don't enable timer7
44 * which is needed for the architected timer to work.
45 * So make sure it is running during early boot.
47 reg_base = ioremap(RK3288_TIMER6_7_PHYS, SZ_16K);
49 writel(0, reg_base + 0x30);
50 writel(0xffffffff, reg_base + 0x20);
51 writel(0xffffffff, reg_base + 0x24);
52 writel(1, reg_base + 0x30);
56 pr_err("rockchip: could not map timer7 registers\n");
60 * Disable auto jtag/sdmmc switching that causes issues
61 * with the mmc controllers making them unreliable
63 grf = syscon_regmap_lookup_by_compatible("rockchip,rk3288-grf");
65 regmap_write(grf, RK3288_GRF_SOC_CON0, 0x10000000);
67 /* Set pwm_sel to RK design PWM; affects all PWMs */
68 regmap_write(grf, RK3288_GRF_SOC_CON2, 0x00010001);
70 pr_err("rockchip: could not get grf syscon\n");
78 static void __init rockchip_dt_init(void)
80 rockchip_suspend_init();
81 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
82 platform_device_register_simple("cpufreq-dt", 0, NULL, 0);
85 static const char * const rockchip_board_dt_compat[] = {
94 DT_MACHINE_START(ROCKCHIP_DT, "Rockchip (Device Tree)")
97 .init_time = rockchip_timer_init,
98 .dt_compat = rockchip_board_dt_compat,
99 .init_machine = rockchip_dt_init,