From: Bin Meng <bmeng.cn@gmail.com>
Date: Fri, 23 Oct 2015 02:13:29 +0000 (-0700)
Subject: x86: Initialize i8254 timer counter 1
X-Git-Url: http://git.dujemihanovic.xyz/login.html?a=commitdiff_plain;h=bffeed0158bc5114a9542ff83c716e352841dcfb;p=u-boot.git

x86: Initialize i8254 timer counter 1

Initialize counter 1, used to refresh request signal. This is
required for legacy purpose as some codes like vgabios utilizes
counter 1 to provide delay functionality.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
---

diff --git a/arch/x86/lib/pcat_timer.c b/arch/x86/lib/pcat_timer.c
index ce15818ec2..347cdda9f6 100644
--- a/arch/x86/lib/pcat_timer.c
+++ b/arch/x86/lib/pcat_timer.c
@@ -9,10 +9,20 @@
 #include <asm/io.h>
 #include <asm/i8254.h>
 
+#define TIMER1_VALUE	18	/* 15.6us */
 #define TIMER2_VALUE	0x0a8e	/* 440Hz */
 
 int pcat_timer_init(void)
 {
+	/*
+	 * Initialize counter 1, used to refresh request signal.
+	 * This is required for legacy purpose as some codes like
+	 * vgabios utilizes counter 1 to provide delay functionality.
+	 */
+	outb(PIT_CMD_CTR1 | PIT_CMD_LOW | PIT_CMD_MODE2,
+	     PIT_BASE + PIT_COMMAND);
+	outb(TIMER1_VALUE, PIT_BASE + PIT_T1);
+
 	/*
 	 * Initialize counter 2, used to drive the speaker.
 	 * To start a beep, set both bit0 and bit1 of port 0x61.