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