1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2014 Tomasz Figa <t.figa@samsung.com>
4 *
5 * Based on Exynos Audio Subsystem Clock Controller driver:
6 *
7 * Copyright (c) 2013 Samsung Electronics Co., Ltd.
8 * Author: Padmavathi Venna <padma.v@samsung.com>
9 *
10 * Driver for Audio Subsystem Clock Controller of S5PV210-compatible SoCs.
11*/
12
13#include <linux/io.h>
14#include <linux/clk.h>
15#include <linux/clk-provider.h>
16#include <linux/of_address.h>
17#include <linux/syscore_ops.h>
18#include <linux/init.h>
19#include <linux/platform_device.h>
20
21#include <dt-bindings/clock/s5pv210-audss.h>
22
23static DEFINE_SPINLOCK(lock);
24static void __iomem *reg_base;
25static struct clk_hw_onecell_data *clk_data;
26
27#define ASS_CLK_SRC 0x0
28#define ASS_CLK_DIV 0x4
29#define ASS_CLK_GATE 0x8
30
31#ifdef CONFIG_PM_SLEEP
32static unsigned long reg_save[][2] = {
33 {ASS_CLK_SRC, 0},
34 {ASS_CLK_DIV, 0},
35 {ASS_CLK_GATE, 0},
36};
37
38static int s5pv210_audss_clk_suspend(void)
39{
40 int i;
41
42 for (i = 0; i < ARRAY_SIZE(reg_save); i++)
43 reg_save[i][1] = readl(addr: reg_base + reg_save[i][0]);
44
45 return 0;
46}
47
48static void s5pv210_audss_clk_resume(void)
49{
50 int i;
51
52 for (i = 0; i < ARRAY_SIZE(reg_save); i++)
53 writel(val: reg_save[i][1], addr: reg_base + reg_save[i][0]);
54}
55
56static struct syscore_ops s5pv210_audss_clk_syscore_ops = {
57 .suspend = s5pv210_audss_clk_suspend,
58 .resume = s5pv210_audss_clk_resume,
59};
60#endif /* CONFIG_PM_SLEEP */
61
62/* register s5pv210_audss clocks */
63static int s5pv210_audss_clk_probe(struct platform_device *pdev)
64{
65 int i, ret = 0;
66 const char *mout_audss_p[2];
67 const char *mout_i2s_p[3];
68 const char *hclk_p;
69 struct clk_hw **clk_table;
70 struct clk *hclk, *pll_ref, *pll_in, *cdclk, *sclk_audio;
71
72 reg_base = devm_platform_ioremap_resource(pdev, index: 0);
73 if (IS_ERR(ptr: reg_base))
74 return PTR_ERR(ptr: reg_base);
75
76 clk_data = devm_kzalloc(dev: &pdev->dev,
77 struct_size(clk_data, hws, AUDSS_MAX_CLKS),
78 GFP_KERNEL);
79
80 if (!clk_data)
81 return -ENOMEM;
82
83 clk_data->num = AUDSS_MAX_CLKS;
84 clk_table = clk_data->hws;
85
86 hclk = devm_clk_get(dev: &pdev->dev, id: "hclk");
87 if (IS_ERR(ptr: hclk)) {
88 dev_err(&pdev->dev, "failed to get hclk clock\n");
89 return PTR_ERR(ptr: hclk);
90 }
91
92 pll_in = devm_clk_get(dev: &pdev->dev, id: "fout_epll");
93 if (IS_ERR(ptr: pll_in)) {
94 dev_err(&pdev->dev, "failed to get fout_epll clock\n");
95 return PTR_ERR(ptr: pll_in);
96 }
97
98 sclk_audio = devm_clk_get(dev: &pdev->dev, id: "sclk_audio0");
99 if (IS_ERR(ptr: sclk_audio)) {
100 dev_err(&pdev->dev, "failed to get sclk_audio0 clock\n");
101 return PTR_ERR(ptr: sclk_audio);
102 }
103
104 /* iiscdclk0 is an optional external I2S codec clock */
105 cdclk = devm_clk_get(dev: &pdev->dev, id: "iiscdclk0");
106 pll_ref = devm_clk_get(dev: &pdev->dev, id: "xxti");
107
108 if (!IS_ERR(ptr: pll_ref))
109 mout_audss_p[0] = __clk_get_name(clk: pll_ref);
110 else
111 mout_audss_p[0] = "xxti";
112 mout_audss_p[1] = __clk_get_name(clk: pll_in);
113 clk_table[CLK_MOUT_AUDSS] = clk_hw_register_mux(NULL, "mout_audss",
114 mout_audss_p, ARRAY_SIZE(mout_audss_p),
115 CLK_SET_RATE_NO_REPARENT,
116 reg_base + ASS_CLK_SRC, 0, 1, 0, &lock);
117
118 mout_i2s_p[0] = "mout_audss";
119 if (!IS_ERR(ptr: cdclk))
120 mout_i2s_p[1] = __clk_get_name(clk: cdclk);
121 else
122 mout_i2s_p[1] = "iiscdclk0";
123 mout_i2s_p[2] = __clk_get_name(clk: sclk_audio);
124 clk_table[CLK_MOUT_I2S_A] = clk_hw_register_mux(NULL, "mout_i2s_audss",
125 mout_i2s_p, ARRAY_SIZE(mout_i2s_p),
126 CLK_SET_RATE_NO_REPARENT,
127 reg_base + ASS_CLK_SRC, 2, 2, 0, &lock);
128
129 clk_table[CLK_DOUT_AUD_BUS] = clk_hw_register_divider(NULL,
130 "dout_aud_bus", "mout_audss", 0,
131 reg_base + ASS_CLK_DIV, 0, 4, 0, &lock);
132 clk_table[CLK_DOUT_I2S_A] = clk_hw_register_divider(NULL,
133 "dout_i2s_audss", "mout_i2s_audss", 0,
134 reg_base + ASS_CLK_DIV, 4, 4, 0, &lock);
135
136 clk_table[CLK_I2S] = clk_hw_register_gate(NULL, "i2s_audss",
137 "dout_i2s_audss", CLK_SET_RATE_PARENT,
138 reg_base + ASS_CLK_GATE, 6, 0, &lock);
139
140 hclk_p = __clk_get_name(clk: hclk);
141
142 clk_table[CLK_HCLK_I2S] = clk_hw_register_gate(NULL, "hclk_i2s_audss",
143 hclk_p, CLK_IGNORE_UNUSED,
144 reg_base + ASS_CLK_GATE, 5, 0, &lock);
145 clk_table[CLK_HCLK_UART] = clk_hw_register_gate(NULL, "hclk_uart_audss",
146 hclk_p, CLK_IGNORE_UNUSED,
147 reg_base + ASS_CLK_GATE, 4, 0, &lock);
148 clk_table[CLK_HCLK_HWA] = clk_hw_register_gate(NULL, "hclk_hwa_audss",
149 hclk_p, CLK_IGNORE_UNUSED,
150 reg_base + ASS_CLK_GATE, 3, 0, &lock);
151 clk_table[CLK_HCLK_DMA] = clk_hw_register_gate(NULL, "hclk_dma_audss",
152 hclk_p, CLK_IGNORE_UNUSED,
153 reg_base + ASS_CLK_GATE, 2, 0, &lock);
154 clk_table[CLK_HCLK_BUF] = clk_hw_register_gate(NULL, "hclk_buf_audss",
155 hclk_p, CLK_IGNORE_UNUSED,
156 reg_base + ASS_CLK_GATE, 1, 0, &lock);
157 clk_table[CLK_HCLK_RP] = clk_hw_register_gate(NULL, "hclk_rp_audss",
158 hclk_p, CLK_IGNORE_UNUSED,
159 reg_base + ASS_CLK_GATE, 0, 0, &lock);
160
161 for (i = 0; i < clk_data->num; i++) {
162 if (IS_ERR(ptr: clk_table[i])) {
163 dev_err(&pdev->dev, "failed to register clock %d\n", i);
164 ret = PTR_ERR(ptr: clk_table[i]);
165 goto unregister;
166 }
167 }
168
169 ret = of_clk_add_hw_provider(np: pdev->dev.of_node, get: of_clk_hw_onecell_get,
170 data: clk_data);
171 if (ret) {
172 dev_err(&pdev->dev, "failed to add clock provider\n");
173 goto unregister;
174 }
175
176#ifdef CONFIG_PM_SLEEP
177 register_syscore_ops(ops: &s5pv210_audss_clk_syscore_ops);
178#endif
179
180 return 0;
181
182unregister:
183 for (i = 0; i < clk_data->num; i++) {
184 if (!IS_ERR(ptr: clk_table[i]))
185 clk_hw_unregister(hw: clk_table[i]);
186 }
187
188 return ret;
189}
190
191static const struct of_device_id s5pv210_audss_clk_of_match[] = {
192 { .compatible = "samsung,s5pv210-audss-clock", },
193 {},
194};
195
196static struct platform_driver s5pv210_audss_clk_driver = {
197 .driver = {
198 .name = "s5pv210-audss-clk",
199 .suppress_bind_attrs = true,
200 .of_match_table = s5pv210_audss_clk_of_match,
201 },
202 .probe = s5pv210_audss_clk_probe,
203};
204
205static int __init s5pv210_audss_clk_init(void)
206{
207 return platform_driver_register(&s5pv210_audss_clk_driver);
208}
209core_initcall(s5pv210_audss_clk_init);
210

source code of linux/drivers/clk/samsung/clk-s5pv210-audss.c