1/*
2 * Device Tree support for Mediatek SoCs
3 *
4 * Copyright (c) 2014 MundoReader S.L.
5 * Author: Matthias Brugger <matthias.bgg@gmail.com>
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#include <linux/init.h>
18#include <asm/mach/arch.h>
19#include <linux/of.h>
20#include <linux/clk-provider.h>
21#include <linux/clocksource.h>
22
23
24#define GPT6_CON_MT65xx 0x10008060
25#define GPT_ENABLE      0x31
26
27static void __init mediatek_timer_init(void)
28{
29	void __iomem *gpt_base;
30
31	if (of_machine_is_compatible("mediatek,mt6589") ||
32	    of_machine_is_compatible("mediatek,mt8135") ||
33	    of_machine_is_compatible("mediatek,mt8127")) {
34		/* turn on GPT6 which ungates arch timer clocks */
35		gpt_base = ioremap(GPT6_CON_MT65xx, 0x04);
36
37		/* enable clock and set to free-run */
38		writel(GPT_ENABLE, gpt_base);
39		iounmap(gpt_base);
40	}
41
42	of_clk_init(NULL);
43	clocksource_probe();
44};
45
46static const char * const mediatek_board_dt_compat[] = {
47	"mediatek,mt6589",
48	"mediatek,mt6592",
49	"mediatek,mt8127",
50	"mediatek,mt8135",
51	NULL,
52};
53
54DT_MACHINE_START(MEDIATEK_DT, "Mediatek Cortex-A7 (Device Tree)")
55	.dt_compat	= mediatek_board_dt_compat,
56	.init_time	= mediatek_timer_init,
57MACHINE_END
58