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

source/bootloader/u-boot-2020.01/drivers/clk/clk-fixed-factor.c

@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 DENX Software Engineering
+ * Lukasz Majewski, DENX Software Engineering, lukma@denx.de
+ *
+ * Copyright (C) 2011 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
+ */
+#include <common.h>
+#include <malloc.h>
+#include <clk-uclass.h>
+#include <dm/device.h>
+#include <linux/clk-provider.h>
+#include <div64.h>
+#include <clk.h>
+#include "clk.h"
+
+#define UBOOT_DM_CLK_IMX_FIXED_FACTOR "ccf_clk_fixed_factor"
+
+static ulong clk_factor_recalc_rate(struct clk *clk)
+{
+	struct clk_fixed_factor *fix =
+		to_clk_fixed_factor(dev_get_clk_ptr(clk->dev));
+	unsigned long parent_rate = clk_get_parent_rate(clk);
+	unsigned long long int rate;
+
+	rate = (unsigned long long int)parent_rate * fix->mult;
+	do_div(rate, fix->div);
+	return (ulong)rate;
+}
+
+const struct clk_ops ccf_clk_fixed_factor_ops = {
+	.get_rate = clk_factor_recalc_rate,
+};
+
+struct clk *clk_hw_register_fixed_factor(struct device *dev,
+		const char *name, const char *parent_name, unsigned long flags,
+		unsigned int mult, unsigned int div)
+{
+	struct clk_fixed_factor *fix;
+	struct clk *clk;
+	int ret;
+
+	fix = kzalloc(sizeof(*fix), GFP_KERNEL);
+	if (!fix)
+		return ERR_PTR(-ENOMEM);
+
+	/* struct clk_fixed_factor assignments */
+	fix->mult = mult;
+	fix->div = div;
+	clk = &fix->clk;
+
+	ret = clk_register(clk, UBOOT_DM_CLK_IMX_FIXED_FACTOR, name,
+			   parent_name);
+	if (ret) {
+		kfree(fix);
+		return ERR_PTR(ret);
+	}
+
+	return clk;
+}
+
+struct clk *clk_register_fixed_factor(struct device *dev, const char *name,
+		const char *parent_name, unsigned long flags,
+		unsigned int mult, unsigned int div)
+{
+	struct clk *clk;
+
+	clk = clk_hw_register_fixed_factor(dev, name, parent_name, flags, mult,
+					  div);
+	if (IS_ERR(clk))
+		return ERR_CAST(clk);
+	return clk;
+}
+
+U_BOOT_DRIVER(imx_clk_fixed_factor) = {
+	.name	= UBOOT_DM_CLK_IMX_FIXED_FACTOR,
+	.id	= UCLASS_CLK,
+	.ops	= &ccf_clk_fixed_factor_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};