1 files changed, 93 insertions, 0 deletions
diff --git a/drivers/clk/stm32/clk-stm32-core.c b/drivers/clk/stm32/clk-stm32-core.c
new file mode 100644
index 000000000000..0fab4a5a8c66
--- /dev/null
+++ b/drivers/clk/stm32/clk-stm32-core.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) STMicroelectronics 2022 - All Rights Reserved
+ * Author: Gabriel Fernandez <gabriel.fernandez@foss.st.com> for STMicroelectronics.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#include "clk-stm32-core.h"
+#include "reset-stm32.h"
+
+static DEFINE_SPINLOCK(rlock);
+
+static int stm32_rcc_clock_init(struct device *dev,
+				const struct of_device_id *match,
+				void __iomem *base)
+{
+	const struct stm32_rcc_match_data *data = match->data;
+	struct clk_hw_onecell_data *clk_data = data->hw_clks;
+	struct device_node *np = dev_of_node(dev);
+	struct clk_hw **hws;
+	int n, max_binding;
+
+	max_binding =  data->maxbinding;
+
+	clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, max_binding), GFP_KERNEL);
+	if (!clk_data)
+		return -ENOMEM;
+
+	clk_data->num = max_binding;
+
+	hws = clk_data->hws;
+
+	for (n = 0; n < max_binding; n++)
+		hws[n] = ERR_PTR(-ENOENT);
+
+	for (n = 0; n < data->num_clocks; n++) {
+		const struct clock_config *cfg_clock = &data->tab_clocks[n];
+		struct clk_hw *hw = ERR_PTR(-ENOENT);
+
+		if (cfg_clock->func)
+			hw = (*cfg_clock->func)(dev, data, base, &rlock,
+						cfg_clock);
+
+		if (IS_ERR(hw)) {
+			dev_err(dev, "Can't register clk %d: %ld\n", n,
+				PTR_ERR(hw));
+			return PTR_ERR(hw);
+		}
+
+		if (cfg_clock->id != NO_ID)
+			hws[cfg_clock->id] = hw;
+	}
+
+	return of_clk_add_hw_provider(np, of_clk_hw_onecell_get, clk_data);
+}
+
+int stm32_rcc_init(struct device *dev, const struct of_device_id *match_data,
+		   void __iomem *base)
+{
+	const struct of_device_id *match;
+	int err;
+
+	match = of_match_node(match_data, dev_of_node(dev));
+	if (!match) {
+		dev_err(dev, "match data not found\n");
+		return -ENODEV;
+	}
+
+	/* RCC Reset Configuration */
+	err = stm32_rcc_reset_init(dev, match, base);
+	if (err) {
+		pr_err("stm32 reset failed to initialize\n");
+		return err;
+	}
+
+	/* RCC Clock Configuration */
+	err = stm32_rcc_clock_init(dev, match, base);
+	if (err) {
+		pr_err("stm32 clock failed to initialize\n");
+		return err;
+	}
+
+	return 0;
+}