drivers/clk/mmp/clk-apmu.c

root/drivers/clk/mmp/clk-apmu.c
// SPDX-License-Identifier: GPL-2.0-only
/*
 * mmp AXI peripharal clock operation source file
 *
 * Copyright (C) 2012 Marvell
 * Chao Xie <xiechao.mail@gmail.com>
 */

#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/slab.h>

#include "clk.h"

#define to_clk_apmu(clk) (container_of(clk, struct clk_apmu, clk))
struct clk_apmu {
        struct clk_hw   hw;
        void __iomem    *base;
        u32             rst_mask;
        u32             enable_mask;
        spinlock_t      *lock;
};

static int clk_apmu_enable(struct clk_hw *hw)
{
        struct clk_apmu *apmu = to_clk_apmu(hw);
        unsigned long data;
        unsigned long flags = 0;

        if (apmu->lock)
                spin_lock_irqsave(apmu->lock, flags);

        data = readl_relaxed(apmu->base) | apmu->enable_mask;
        writel_relaxed(data, apmu->base);

        if (apmu->lock)
                spin_unlock_irqrestore(apmu->lock, flags);

        return 0;
}

static void clk_apmu_disable(struct clk_hw *hw)
{
        struct clk_apmu *apmu = to_clk_apmu(hw);
        unsigned long data;
        unsigned long flags = 0;

        if (apmu->lock)
                spin_lock_irqsave(apmu->lock, flags);

        data = readl_relaxed(apmu->base) & ~apmu->enable_mask;
        writel_relaxed(data, apmu->base);

        if (apmu->lock)
                spin_unlock_irqrestore(apmu->lock, flags);
}

static const struct clk_ops clk_apmu_ops = {
        .enable = clk_apmu_enable,
        .disable = clk_apmu_disable,
};

struct clk *mmp_clk_register_apmu(const char *name, const char *parent_name,
                void __iomem *base, u32 enable_mask, spinlock_t *lock)
{
        struct clk_apmu *apmu;
        struct clk *clk;
        struct clk_init_data init;

        apmu = kzalloc_obj(*apmu);
        if (!apmu)
                return NULL;

        init.name = name;
        init.ops = &clk_apmu_ops;
        init.flags = CLK_SET_RATE_PARENT;
        init.parent_names = (parent_name ? &parent_name : NULL);
        init.num_parents = (parent_name ? 1 : 0);

        apmu->base = base;
        apmu->enable_mask = enable_mask;
        apmu->lock = lock;
        apmu->hw.init = &init;

        clk = clk_register(NULL, &apmu->hw);

        if (IS_ERR(clk))
                kfree(apmu);

        return clk;
}
Linux
