1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * mmp AXI peripharal clock operation source file
4 *
5 * Copyright (C) 2012 Marvell
6 * Chao Xie <xiechao.mail@gmail.com>
7 */
8
9#include <linux/kernel.h>
10#include <linux/io.h>
11#include <linux/err.h>
12#include <linux/delay.h>
13#include <linux/slab.h>
14
15#include "clk.h"
16
17#define to_clk_apmu(clk) (container_of(clk, struct clk_apmu, clk))
18struct clk_apmu {
19	struct clk_hw   hw;
20	void __iomem    *base;
21	u32		rst_mask;
22	u32		enable_mask;
23	spinlock_t	*lock;
24};
25
26static int clk_apmu_enable(struct clk_hw *hw)
27{
28	struct clk_apmu *apmu = to_clk_apmu(hw);
29	unsigned long data;
30	unsigned long flags = 0;
31
32	if (apmu->lock)
33		spin_lock_irqsave(apmu->lock, flags);
34
35	data = readl_relaxed(apmu->base) | apmu->enable_mask;
36	writel_relaxed(data, apmu->base);
37
38	if (apmu->lock)
39		spin_unlock_irqrestore(apmu->lock, flags);
40
41	return 0;
42}
43
44static void clk_apmu_disable(struct clk_hw *hw)
45{
46	struct clk_apmu *apmu = to_clk_apmu(hw);
47	unsigned long data;
48	unsigned long flags = 0;
49
50	if (apmu->lock)
51		spin_lock_irqsave(apmu->lock, flags);
52
53	data = readl_relaxed(apmu->base) & ~apmu->enable_mask;
54	writel_relaxed(data, apmu->base);
55
56	if (apmu->lock)
57		spin_unlock_irqrestore(apmu->lock, flags);
58}
59
60static const struct clk_ops clk_apmu_ops = {
61	.enable = clk_apmu_enable,
62	.disable = clk_apmu_disable,
63};
64
65struct clk *mmp_clk_register_apmu(const char *name, const char *parent_name,
66		void __iomem *base, u32 enable_mask, spinlock_t *lock)
67{
68	struct clk_apmu *apmu;
69	struct clk *clk;
70	struct clk_init_data init;
71
72	apmu = kzalloc(sizeof(*apmu), GFP_KERNEL);
73	if (!apmu)
74		return NULL;
75
76	init.name = name;
77	init.ops = &clk_apmu_ops;
78	init.flags = CLK_SET_RATE_PARENT;
79	init.parent_names = (parent_name ? &parent_name : NULL);
80	init.num_parents = (parent_name ? 1 : 0);
81
82	apmu->base = base;
83	apmu->enable_mask = enable_mask;
84	apmu->lock = lock;
85	apmu->hw.init = &init;
86
87	clk = clk_register(NULL, &apmu->hw);
88
89	if (IS_ERR(clk))
90		kfree(apmu);
91
92	return clk;
93}
94