sandbox: add a sandbox timer and basic test

Add a sandbox timer which get time from host os and a basic
test.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/sandbox/dts/sandbox.dts

@@ -177,6 +177,10 @@
 		sides = <4>;
 	};
 
+	timer {
+		compatible = "sandbox,timer";
+	};
+
 	tpm {
 		compatible = "google,sandbox-tpm";
 	};

board/sandbox/sandbox.c

@@ -26,6 +26,7 @@ void flush_cache(unsigned long start, unsigned long size)
 {
 }
 
+#ifndef CONFIG_TIMER
 /* system timer offset in ms */
 static unsigned long sandbox_timer_offset;
 
@@ -38,6 +39,7 @@ unsigned long timer_read_counter(void)
 {
 	return os_get_nsec() / 1000 + sandbox_timer_offset * 1000;
 }
+#endif
 
 int dram_init(void)
 {

configs/sandbox_defconfig

@@ -53,6 +53,8 @@ CONFIG_SANDBOX_SERIAL=y
 CONFIG_SOUND=y
 CONFIG_SOUND_SANDBOX=y
 CONFIG_SANDBOX_SPI=y
+CONFIG_TIMER=y
+CONFIG_SANDBOX_TIMER=y
 CONFIG_TPM_TIS_SANDBOX=y
 CONFIG_USB=y
 CONFIG_DM_USB=y

doc/device-tree-bindings/timer/sandbox_timer.txt

@@ -0,0 +1,7 @@
+Sandbox timer
+
+The sandbox timer device is an emulated device which gets time from
+host os.
+
+Required properties:
+  compatible: "sandbox,timer"

drivers/timer/Kconfig

@@ -16,4 +16,11 @@ config ALTERA_TIMER
 	  Select this to enable an timer for Altera devices. Please find
 	  details on the "Embedded Peripherals IP User Guide" of Altera.
 
+config SANDBOX_TIMER
+	bool "Sandbox Timer support"
+	depends on SANDBOX && TIMER
+	help
+	  Select this to enable an emulated timer for sandbox. It gets
+	  time from host os.
+
 endmenu

drivers/timer/Makefile

@@ -6,3 +6,4 @@
 
 obj-$(CONFIG_TIMER)		+= timer-uclass.o
 obj-$(CONFIG_ALTERA_TIMER)	+= altera_timer.o
+obj-$(CONFIG_SANDBOX_TIMER)	+= sandbox_timer.o

drivers/timer/sandbox_timer.c

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <timer.h>
+#include <os.h>
+
+/* system timer offset in ms */
+static unsigned long sandbox_timer_offset;
+
+void sandbox_timer_add_offset(unsigned long offset)
+{
+	sandbox_timer_offset += offset;
+}
+
+static int sandbox_timer_get_count(struct udevice *dev, unsigned long *count)
+{
+	*count = os_get_nsec() / 1000 + sandbox_timer_offset * 1000;
+
+	return 0;
+}
+
+static int sandbox_timer_probe(struct udevice *dev)
+{
+	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+
+	uc_priv->clock_rate = 1000000;
+
+	return 0;
+}
+
+static const struct timer_ops sandbox_timer_ops = {
+	.get_count = sandbox_timer_get_count,
+};
+
+static const struct udevice_id sandbox_timer_ids[] = {
+	{ .compatible = "sandbox,timer" },
+	{ }
+};
+
+U_BOOT_DRIVER(sandbox_timer) = {
+	.name	= "sandbox_timer",
+	.id	= UCLASS_TIMER,
+	.of_match = sandbox_timer_ids,
+	.probe = sandbox_timer_probe,
+	.ops	= &sandbox_timer_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};

include/configs/sandbox.h

@@ -19,7 +19,9 @@
 #define CONFIG_IO_TRACE
 #define CONFIG_CMD_IOTRACE
 
+#ifndef CONFIG_TIMER
 #define CONFIG_SYS_TIMER_RATE		1000000
+#endif
 
 #define CONFIG_SYS_STDIO_DEREGISTER
 

test/dm/Makefile

@@ -33,5 +33,6 @@ obj-y += syscon.o
 obj-$(CONFIG_DM_USB) += usb.o
 obj-$(CONFIG_DM_PMIC) += pmic.o
 obj-$(CONFIG_DM_REGULATOR) += regulator.o
+obj-$(CONFIG_TIMER) += timer.o
 obj-$(CONFIG_ADC) += adc.o
 endif

test/dm/timer.c

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <timer.h>
+#include <dm/test.h>
+#include <test/ut.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * Basic test of the timer uclass.
+ */
+static int dm_test_timer_base(struct unit_test_state *uts)
+{
+	struct udevice *dev;
+
+	ut_assertok(uclass_get_device(UCLASS_TIMER, 0, &dev));
+	ut_asserteq(1000000, timer_get_rate(dev));
+
+	return 0;
+}
+DM_TEST(dm_test_timer_base, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);