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https://github.com/edk2-porting/linux-next.git
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3bb165608e
Based on the normalized pattern:
this file is licensed under the terms of the gnu general public
license version 2 this program is licensed as is without any warranty
of any kind whether express or implied
extracted by the scancode license scanner the SPDX license identifier
GPL-2.0-only
has been chosen to replace the boilerplate/reference.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
94 lines
1.9 KiB
C
94 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* mmp AXI peripharal clock operation source file
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*
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* Copyright (C) 2012 Marvell
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* Chao Xie <xiechao.mail@gmail.com>
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*/
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include "clk.h"
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#define to_clk_apmu(clk) (container_of(clk, struct clk_apmu, clk))
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struct clk_apmu {
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struct clk_hw hw;
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void __iomem *base;
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u32 rst_mask;
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u32 enable_mask;
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spinlock_t *lock;
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};
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static int clk_apmu_enable(struct clk_hw *hw)
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{
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struct clk_apmu *apmu = to_clk_apmu(hw);
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unsigned long data;
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unsigned long flags = 0;
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if (apmu->lock)
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spin_lock_irqsave(apmu->lock, flags);
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data = readl_relaxed(apmu->base) | apmu->enable_mask;
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writel_relaxed(data, apmu->base);
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if (apmu->lock)
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spin_unlock_irqrestore(apmu->lock, flags);
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return 0;
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}
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static void clk_apmu_disable(struct clk_hw *hw)
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{
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struct clk_apmu *apmu = to_clk_apmu(hw);
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unsigned long data;
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unsigned long flags = 0;
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if (apmu->lock)
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spin_lock_irqsave(apmu->lock, flags);
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data = readl_relaxed(apmu->base) & ~apmu->enable_mask;
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writel_relaxed(data, apmu->base);
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if (apmu->lock)
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spin_unlock_irqrestore(apmu->lock, flags);
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}
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static const struct clk_ops clk_apmu_ops = {
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.enable = clk_apmu_enable,
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.disable = clk_apmu_disable,
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};
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struct clk *mmp_clk_register_apmu(const char *name, const char *parent_name,
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void __iomem *base, u32 enable_mask, spinlock_t *lock)
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{
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struct clk_apmu *apmu;
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struct clk *clk;
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struct clk_init_data init;
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apmu = kzalloc(sizeof(*apmu), GFP_KERNEL);
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if (!apmu)
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return NULL;
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init.name = name;
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init.ops = &clk_apmu_ops;
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init.flags = CLK_SET_RATE_PARENT;
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init.parent_names = (parent_name ? &parent_name : NULL);
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init.num_parents = (parent_name ? 1 : 0);
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apmu->base = base;
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apmu->enable_mask = enable_mask;
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apmu->lock = lock;
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apmu->hw.init = &init;
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clk = clk_register(NULL, &apmu->hw);
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if (IS_ERR(clk))
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kfree(apmu);
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return clk;
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}
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