clk-apmu.c
2.06 KB
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/*
* mmp AXI peripharal clock operation source file
*
* Copyright (C) 2012 Marvell
* Chao Xie <xiechao.mail@gmail.com>
*
* 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.
*/
#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 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(sizeof(*apmu), GFP_KERNEL);
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;
}