aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/mediatek/patches/0041-arm-mediatek-enable-gpt6-on-boot-up-to-make-arch-tim.patch
blob: 48c7d142d996c18e34b0a2a3cbea1a331b3d56c3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
From eec99287ace37015ed313b4fc27ba205a158b66c Mon Sep 17 00:00:00 2001
From: Matthias Brugger <matthias.bgg@gmail.com>
Date: Fri, 1 May 2015 15:43:26 +0800
Subject: [PATCH 41/76] arm: mediatek: enable gpt6 on boot up to make arch
 timer working

We enable GTP6 which ungates the arch timer clock.
In the future this should be done in the bootloader.

Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
---
 arch/arm/mach-mediatek/mediatek.c |   29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

--- a/arch/arm/mach-mediatek/mediatek.c
+++ b/arch/arm/mach-mediatek/mediatek.c
@@ -16,6 +16,34 @@
  */
 #include <linux/init.h>
 #include <asm/mach/arch.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+#include <linux/clocksource.h>
+
+
+#define GPT6_CON_MT65xx 0x10008060
+#define GPT_ENABLE      0x31
+
+static void __init mediatek_timer_init(void)
+{
+	void __iomem *gpt_base = 0;
+
+	if (of_machine_is_compatible("mediatek,mt6589") ||
+	    of_machine_is_compatible("mediatek,mt8135") ||
+	    of_machine_is_compatible("mediatek,mt8127")) {
+		/* turn on GPT6 which ungates arch timer clocks */
+		gpt_base = ioremap(GPT6_CON_MT65xx, 0x04);
+	}
+
+	/* enabel clock and set to free-run */
+	if (gpt_base) {
+		writel(GPT_ENABLE, gpt_base);
+		iounmap(gpt_base);
+	}
+
+	of_clk_init(NULL);
+	clocksource_of_init();
+};
 
 static const char * const mediatek_board_dt_compat[] = {
 	"mediatek,mt6589",
@@ -27,4 +55,5 @@ static const char * const mediatek_board
 
 DT_MACHINE_START(MEDIATEK_DT, "Mediatek Cortex-A7 (Device Tree)")
 	.dt_compat	= mediatek_board_dt_compat,
+	.init_time	= mediatek_timer_init,
 MACHINE_END