Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / arm / cpu / arm926ejs / versatile / timer.c

diff --git a/qemu/roms/u-boot/arch/arm/cpu/arm926ejs/versatile/timer.c b/qemu/roms/u-boot/arch/arm/cpu/arm926ejs/versatile/timer.c
new file mode 100644 (file)
index 0000000..5d694d8
--- /dev/null
+++ b/qemu/roms/u-boot/arch/arm/cpu/arm926ejs/versatile/timer.c
@@ -0,0 +1,64 @@
+/*
+ * (C) Copyright 2003
+ * Texas Instruments <www.ti.com>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * (C) Copyright 2002-2004
+ * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
+ *
+ * (C) Copyright 2004
+ * Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+
+#define TIMER_ENABLE   (1 << 7)
+#define TIMER_MODE_MSK (1 << 6)
+#define TIMER_MODE_FR  (0 << 6)
+#define TIMER_MODE_PD  (1 << 6)
+
+#define TIMER_INT_EN   (1 << 5)
+#define TIMER_PRS_MSK  (3 << 2)
+#define TIMER_PRS_8S   (1 << 3)
+#define TIMER_SIZE_MSK (1 << 2)
+#define TIMER_ONE_SHT  (1 << 0)
+
+int timer_init (void)
+{
+       ulong   tmr_ctrl_val;
+
+       /* 1st disable the Timer */
+       tmr_ctrl_val = *(volatile ulong *)(CONFIG_SYS_TIMERBASE + 8);
+       tmr_ctrl_val &= ~TIMER_ENABLE;
+       *(volatile ulong *)(CONFIG_SYS_TIMERBASE + 8) = tmr_ctrl_val;
+
+       /*
+        * The Timer Control Register has one Undefined/Shouldn't Use Bit
+        * So we should do read/modify/write Operation
+        */
+
+       /*
+        * Timer Mode : Free Running
+        * Interrupt : Disabled
+        * Prescale : 8 Stage, Clk/256
+        * Tmr Siz : 16 Bit Counter
+        * Tmr in Wrapping Mode
+        */
+       tmr_ctrl_val = *(volatile ulong *)(CONFIG_SYS_TIMERBASE + 8);
+       tmr_ctrl_val &= ~(TIMER_MODE_MSK | TIMER_INT_EN | TIMER_PRS_MSK | TIMER_SIZE_MSK | TIMER_ONE_SHT );
+       tmr_ctrl_val |= (TIMER_ENABLE | TIMER_PRS_8S);
+
+       *(volatile ulong *)(CONFIG_SYS_TIMERBASE + 8) = tmr_ctrl_val;
+
+       return 0;
+}
+