1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Device Tree support for Mediatek SoCs
4 *
5 * Copyright (c) 2014 MundoReader S.L.
6 * Author: Matthias Brugger <matthias.bgg@gmail.com>
7 */
8 #include <linux/init.h>
9 #include <linux/io.h>
10 #include <asm/mach/arch.h>
11 #include <linux/of.h>
12 #include <linux/of_clk.h>
13 #include <linux/clocksource.h>
14
15
16 #define GPT6_CON_MT65xx 0x10008060
17 #define GPT_ENABLE 0x31
18
mediatek_timer_init(void)19 static void __init mediatek_timer_init(void)
20 {
21 void __iomem *gpt_base;
22
23 if (of_machine_is_compatible("mediatek,mt6589") ||
24 of_machine_is_compatible("mediatek,mt7623") ||
25 of_machine_is_compatible("mediatek,mt8135") ||
26 of_machine_is_compatible("mediatek,mt8127")) {
27 /* turn on GPT6 which ungates arch timer clocks */
28 gpt_base = ioremap(GPT6_CON_MT65xx, 0x04);
29
30 /* enable clock and set to free-run */
31 writel(GPT_ENABLE, gpt_base);
32 iounmap(gpt_base);
33 }
34
35 of_clk_init(NULL);
36 timer_probe();
37 };
38
39 static const char * const mediatek_board_dt_compat[] = {
40 "mediatek,mt2701",
41 "mediatek,mt6572",
42 "mediatek,mt6582",
43 "mediatek,mt6589",
44 "mediatek,mt6592",
45 "mediatek,mt7623",
46 "mediatek,mt7629",
47 "mediatek,mt8127",
48 "mediatek,mt8135",
49 NULL,
50 };
51
52 DT_MACHINE_START(MEDIATEK_DT, "Mediatek Cortex-A7 (Device Tree)")
53 .dt_compat = mediatek_board_dt_compat,
54 .init_time = mediatek_timer_init,
55 MACHINE_END
56