commit ce8a36f9f7c6aedca61476f3fd71a92609499090
author Wenyou.Yang@microchip.com <Wenyou.Yang@microchip.com> Tue Aug 15 17:40:26 2017 +0800
committer Tom Rini <trini@konsulko.com> Sat Aug 26 14:56:08 2017 -0400
tree c092a050bfb1e5af4e2579024524795f36fc6ce6
parent ce103981204005a4bfa7cf1c256536848537efef

driver: timer: Add the Atmel PIT timer driver

Add the new Atmel PIT timer driver, which supports the driver model
and device tree.

Signed-off-by: Wenyou Yang <wenyou.yang@microchip.com>

drivers/timer/atmel_pit_timer.c

diff --git a/drivers/timer/atmel_pit_timer.c b/drivers/timer/atmel_pit_timer.c
new file mode 100644
index 0000000..999717b
--- /dev/null
+++ b/drivers/timer/atmel_pit_timer.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2017 Microchip Corporation
+ * 		      Wenyou.Yang <wenyou.yang@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <timer.h>
+#include <asm/io.h>
+
+#define AT91_PIT_VALUE		0xfffff
+#define AT91_PIT_PITEN		BIT(24)		/* Timer Enabled */
+
+struct atmel_pit_regs {
+	u32	mode;
+	u32	status;
+	u32	value;
+	u32	value_image;
+};
+
+struct atmel_pit_platdata {
+	struct atmel_pit_regs *regs;
+};
+
+static int atmel_pit_get_count(struct udevice *dev, u64 *count)
+{
+	struct atmel_pit_platdata *plat = dev_get_platdata(dev);
+	struct atmel_pit_regs *const regs = plat->regs;
+	u32 val = readl(&regs->value_image);
+
+	*count = timer_conv_64(val);
+
+	return 0;
+}
+
+static int atmel_pit_probe(struct udevice *dev)
+{
+	struct atmel_pit_platdata *plat = dev_get_platdata(dev);
+	struct atmel_pit_regs *const regs = plat->regs;
+	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct clk clk;
+	ulong clk_rate;
+	int ret;
+
+	ret = clk_get_by_index(dev, 0, &clk);
+	if (ret)
+		return -EINVAL;
+
+	clk_rate = clk_get_rate(&clk);
+	if (!clk_rate)
+		return -EINVAL;
+
+	uc_priv->clock_rate = clk_rate / 16;
+
+	writel(AT91_PIT_VALUE | AT91_PIT_PITEN, &regs->mode);
+
+	return 0;
+}
+
+static int atmel_pit_ofdata_to_platdata(struct udevice *dev)
+{
+	struct atmel_pit_platdata *plat = dev_get_platdata(dev);
+
+	plat->regs = (struct atmel_pit_regs *)devfdt_get_addr_ptr(dev);
+
+	return 0;
+}
+
+static const struct timer_ops atmel_pit_ops = {
+	.get_count = atmel_pit_get_count,
+};
+
+static const struct udevice_id atmel_pit_ids[] = {
+	{ .compatible = "atmel,at91sam9260-pit" },
+	{ }
+};
+
+U_BOOT_DRIVER(atmel_pit) = {
+	.name	= "atmel_pit",
+	.id	= UCLASS_TIMER,
+	.of_match = atmel_pit_ids,
+	.ofdata_to_platdata = atmel_pit_ofdata_to_platdata,
+	.platdata_auto_alloc_size = sizeof(struct atmel_pit_platdata),
+	.probe	= atmel_pit_probe,
+	.ops	= &atmel_pit_ops,
+	.flags	= DM_FLAG_PRE_RELOC,
+};