linux-kernel - [PATCH v4 8/8] ARM: realtek: Enable RTD1195 arch timer

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Message-Id: <20191123203759.20708-9-afaerber@suse.de>
Date:   Sat, 23 Nov 2019 21:37:59 +0100
From:   Andreas Färber <afaerber@...e.de>
To:     linux-realtek-soc@...ts.infradead.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Andreas Färber <afaerber@...e.de>,
        Russell King <linux@...linux.org.uk>
Subject: [PATCH v4 8/8] ARM: realtek: Enable RTD1195 arch timer

Without this magic write the timer doesn't work and boot gets stuck.

Signed-off-by: Andreas Färber <afaerber@...e.de>
---
 What is the name of the register 0xff018000?
 Is 0x1 a BIT(0) write, or how are the register bits defined?
 Is this a reset or a clock gate? How should we model it in DT?
 
 v3 -> v4:
 * Use writel_relaxed() instead of writel()
 
 v2 -> v3: Unchanged
 
 v2: New
 
 arch/arm/mach-realtek/rtd1195.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/arm/mach-realtek/rtd1195.c b/arch/arm/mach-realtek/rtd1195.c
index 0381a4447384..8d4de0c2308d 100644
--- a/arch/arm/mach-realtek/rtd1195.c
+++ b/arch/arm/mach-realtek/rtd1195.c
@@ -5,6 +5,9 @@
  * Copyright (c) 2017-2019 Andreas Färber
  */
 
+#include <linux/clk-provider.h>
+#include <linux/clocksource.h>
+#include <linux/io.h>
 #include <linux/memblock.h>
 #include <asm/mach/arch.h>
 
@@ -27,6 +30,18 @@ static void __init rtd1195_reserve(void)
 	rtd1195_memblock_remove(0x18100000, 0x01000000);
 }
 
+static void __init rtd1195_init_time(void)
+{
+	void __iomem *base;
+
+	base = ioremap(0xff018000, 4);
+	writel_relaxed(0x1, base);
+	iounmap(base);
+
+	of_clk_init(NULL);
+	timer_probe();
+}
+
 static const char *const rtd1195_dt_compat[] __initconst = {
 	"realtek,rtd1195",
 	NULL
@@ -34,6 +49,7 @@ static const char *const rtd1195_dt_compat[] __initconst = {
 
 DT_MACHINE_START(rtd1195, "Realtek RTD1195")
 	.dt_compat = rtd1195_dt_compat,
+	.init_time = rtd1195_init_time,
 	.reserve = rtd1195_reserve,
 	.l2c_aux_val = 0x0,
 	.l2c_aux_mask = ~0x0,
-- 
2.16.4