tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
4 */
5
6#include <linux/kernel.h>
7#include <linux/io.h>
8#include <linux/err.h>
9#include <linux/delay.h>
10#include <linux/slab.h>
11#include <linux/clk-provider.h>
12
13#include "clk.h"
14
15#define pll_out_enb(p) (BIT(p->enb_bit_idx))
16#define pll_out_rst(p) (BIT(p->rst_bit_idx))
17
18static int clk_pll_out_is_enabled(struct clk_hw *hw)
19{
20 struct tegra_clk_pll_out *pll_out = to_clk_pll_out(hw);
21 u32 val = readl_relaxed(pll_out->reg);
22 int state;
23
24 state = (val & pll_out_enb(pll_out)) ? 1 : 0;
25 if (!(val & (pll_out_rst(pll_out))))
26 state = 0;
27 return state;
28}
29
30static int clk_pll_out_enable(struct clk_hw *hw)
31{
32 struct tegra_clk_pll_out *pll_out = to_clk_pll_out(hw);
33 unsigned long flags = 0;
34 u32 val;
35
36 if (pll_out->lock)
37 spin_lock_irqsave(pll_out->lock, flags);
38
39 val = readl_relaxed(pll_out->reg);
40
41 val |= (pll_out_enb(pll_out) | pll_out_rst(pll_out));
42
43 writel_relaxed(val, pll_out->reg);
44 udelay(2);
45
46 if (pll_out->lock)
47 spin_unlock_irqrestore(pll_out->lock, flags);
48
49 return 0;
50}
51
52static void clk_pll_out_disable(struct clk_hw *hw)
53{
54 struct tegra_clk_pll_out *pll_out = to_clk_pll_out(hw);
55 unsigned long flags = 0;
56 u32 val;
57
58 if (pll_out->lock)
59 spin_lock_irqsave(pll_out->lock, flags);
60
61 val = readl_relaxed(pll_out->reg);
62
63 val &= ~(pll_out_enb(pll_out) | pll_out_rst(pll_out));
64
65 writel_relaxed(val, pll_out->reg);
66 udelay(2);
67
68 if (pll_out->lock)
69 spin_unlock_irqrestore(pll_out->lock, flags);
70}
71
72const struct clk_ops tegra_clk_pll_out_ops = {
73 .is_enabled = clk_pll_out_is_enabled,
74 .enable = clk_pll_out_enable,
75 .disable = clk_pll_out_disable,
76};
77
78struct clk *tegra_clk_register_pll_out(const char *name,
79 const char *parent_name, void __iomem *reg, u8 enb_bit_idx,
80 u8 rst_bit_idx, unsigned long flags, u8 pll_out_flags,
81 spinlock_t *lock)
82{
83 struct tegra_clk_pll_out *pll_out;
84 struct clk *clk;
85 struct clk_init_data init;
86
87 pll_out = kzalloc(sizeof(*pll_out), GFP_KERNEL);
88 if (!pll_out)
89 return ERR_PTR(-ENOMEM);
90
91 init.name = name;
92 init.ops = &tegra_clk_pll_out_ops;
93 init.parent_names = (parent_name ? &parent_name : NULL);
94 init.num_parents = (parent_name ? 1 : 0);
95 init.flags = flags;
96
97 pll_out->reg = reg;
98 pll_out->enb_bit_idx = enb_bit_idx;
99 pll_out->rst_bit_idx = rst_bit_idx;
100 pll_out->flags = pll_out_flags;
101 pll_out->lock = lock;
102
103 /* Data in .init is copied by clk_register(), so stack variable OK */
104 pll_out->hw.init = &init;
105
106 clk = clk_register(NULL, &pll_out->hw);
107 if (IS_ERR(clk))
108 kfree(pll_out);
109
110 return clk;
111}