GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/drivers/timer/ostm_timer.c

@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Renesas RZ/A1 R7S72100 OSTM Timer driver
+ *
+ * Copyright (C) 2019 Marek Vasut <marek.vasut@gmail.com>
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <dm.h>
+#include <clk.h>
+#include <timer.h>
+
+#define OSTM_CMP	0x00
+#define OSTM_CNT	0x04
+#define OSTM_TE		0x10
+#define OSTM_TS		0x14
+#define OSTM_TT		0x18
+#define OSTM_CTL	0x20
+#define OSTM_CTL_D	BIT(1)
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct ostm_priv {
+	fdt_addr_t	regs;
+};
+
+static int ostm_get_count(struct udevice *dev, u64 *count)
+{
+	struct ostm_priv *priv = dev_get_priv(dev);
+
+	*count = timer_conv_64(readl(priv->regs + OSTM_CNT));
+
+	return 0;
+}
+
+static int ostm_probe(struct udevice *dev)
+{
+	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct ostm_priv *priv = dev_get_priv(dev);
+#if CONFIG_IS_ENABLED(CLK)
+	struct clk clk;
+	int ret;
+
+	ret = clk_get_by_index(dev, 0, &clk);
+	if (ret)
+		return ret;
+
+	uc_priv->clock_rate = clk_get_rate(&clk);
+
+	clk_free(&clk);
+#else
+	uc_priv->clock_rate = CONFIG_SYS_CLK_FREQ / 2;
+#endif
+
+	readb(priv->regs + OSTM_CTL);
+	writeb(OSTM_CTL_D, priv->regs + OSTM_CTL);
+
+	setbits_8(priv->regs + OSTM_TT, BIT(0));
+	writel(0xffffffff, priv->regs + OSTM_CMP);
+	setbits_8(priv->regs + OSTM_TS, BIT(0));
+
+	return 0;
+}
+
+static int ostm_ofdata_to_platdata(struct udevice *dev)
+{
+	struct ostm_priv *priv = dev_get_priv(dev);
+
+	priv->regs = dev_read_addr(dev);
+
+	return 0;
+}
+
+static const struct timer_ops ostm_ops = {
+	.get_count	= ostm_get_count,
+};
+
+static const struct udevice_id ostm_ids[] = {
+	{ .compatible = "renesas,ostm" },
+	{}
+};
+
+U_BOOT_DRIVER(ostm_timer) = {
+	.name		= "ostm-timer",
+	.id		= UCLASS_TIMER,
+	.ops		= &ostm_ops,
+	.probe		= ostm_probe,
+	.of_match	= ostm_ids,
+	.ofdata_to_platdata = ostm_ofdata_to_platdata,
+	.priv_auto_alloc_size = sizeof(struct ostm_priv),
+};