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9#include <linux/slab.h>
10#include <linux/io.h>
11#include <linux/clk.h>
12#include <linux/clk-provider.h>
13#include <linux/of_address.h>
14#include <linux/of_device.h>
15#include <linux/module.h>
16#include <linux/platform_device.h>
17#include <linux/pm_runtime.h>
18
19#include <dt-bindings/clock/exynos-audss-clk.h>
20
21static DEFINE_SPINLOCK(lock);
22static void __iomem *reg_base;
23static struct clk_hw_onecell_data *clk_data;
24
25
26
27
28
29
30static struct clk *epll;
31
32#define ASS_CLK_SRC 0x0
33#define ASS_CLK_DIV 0x4
34#define ASS_CLK_GATE 0x8
35
36static unsigned long reg_save[][2] = {
37 { ASS_CLK_SRC, 0 },
38 { ASS_CLK_DIV, 0 },
39 { ASS_CLK_GATE, 0 },
40};
41
42static int __maybe_unused exynos_audss_clk_suspend(struct device *dev)
43{
44 int i;
45
46 for (i = 0; i < ARRAY_SIZE(reg_save); i++)
47 reg_save[i][1] = readl(reg_base + reg_save[i][0]);
48
49 return 0;
50}
51
52static int __maybe_unused exynos_audss_clk_resume(struct device *dev)
53{
54 int i;
55
56 for (i = 0; i < ARRAY_SIZE(reg_save); i++)
57 writel(reg_save[i][1], reg_base + reg_save[i][0]);
58
59 return 0;
60}
61
62struct exynos_audss_clk_drvdata {
63 unsigned int has_adma_clk:1;
64 unsigned int has_mst_clk:1;
65 unsigned int enable_epll:1;
66 unsigned int num_clks;
67};
68
69static const struct exynos_audss_clk_drvdata exynos4210_drvdata = {
70 .num_clks = EXYNOS_AUDSS_MAX_CLKS - 1,
71 .enable_epll = 1,
72};
73
74static const struct exynos_audss_clk_drvdata exynos5410_drvdata = {
75 .num_clks = EXYNOS_AUDSS_MAX_CLKS - 1,
76 .has_mst_clk = 1,
77};
78
79static const struct exynos_audss_clk_drvdata exynos5420_drvdata = {
80 .num_clks = EXYNOS_AUDSS_MAX_CLKS,
81 .has_adma_clk = 1,
82 .enable_epll = 1,
83};
84
85static const struct of_device_id exynos_audss_clk_of_match[] = {
86 {
87 .compatible = "samsung,exynos4210-audss-clock",
88 .data = &exynos4210_drvdata,
89 }, {
90 .compatible = "samsung,exynos5250-audss-clock",
91 .data = &exynos4210_drvdata,
92 }, {
93 .compatible = "samsung,exynos5410-audss-clock",
94 .data = &exynos5410_drvdata,
95 }, {
96 .compatible = "samsung,exynos5420-audss-clock",
97 .data = &exynos5420_drvdata,
98 },
99 { },
100};
101MODULE_DEVICE_TABLE(of, exynos_audss_clk_of_match);
102
103static void exynos_audss_clk_teardown(void)
104{
105 int i;
106
107 for (i = EXYNOS_MOUT_AUDSS; i < EXYNOS_DOUT_SRP; i++) {
108 if (!IS_ERR(clk_data->hws[i]))
109 clk_hw_unregister_mux(clk_data->hws[i]);
110 }
111
112 for (; i < EXYNOS_SRP_CLK; i++) {
113 if (!IS_ERR(clk_data->hws[i]))
114 clk_hw_unregister_divider(clk_data->hws[i]);
115 }
116
117 for (; i < clk_data->num; i++) {
118 if (!IS_ERR(clk_data->hws[i]))
119 clk_hw_unregister_gate(clk_data->hws[i]);
120 }
121}
122
123
124static int exynos_audss_clk_probe(struct platform_device *pdev)
125{
126 const char *mout_audss_p[] = {"fin_pll", "fout_epll"};
127 const char *mout_i2s_p[] = {"mout_audss", "cdclk0", "sclk_audio0"};
128 const char *sclk_pcm_p = "sclk_pcm0";
129 struct clk *pll_ref, *pll_in, *cdclk, *sclk_audio, *sclk_pcm_in;
130 const struct exynos_audss_clk_drvdata *variant;
131 struct clk_hw **clk_table;
132 struct resource *res;
133 struct device *dev = &pdev->dev;
134 int i, ret = 0;
135
136 variant = of_device_get_match_data(&pdev->dev);
137 if (!variant)
138 return -EINVAL;
139
140 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
141 reg_base = devm_ioremap_resource(dev, res);
142 if (IS_ERR(reg_base))
143 return PTR_ERR(reg_base);
144
145 epll = ERR_PTR(-ENODEV);
146
147 clk_data = devm_kzalloc(dev,
148 struct_size(clk_data, hws,
149 EXYNOS_AUDSS_MAX_CLKS),
150 GFP_KERNEL);
151 if (!clk_data)
152 return -ENOMEM;
153
154 clk_data->num = variant->num_clks;
155 clk_table = clk_data->hws;
156
157 pll_ref = devm_clk_get(dev, "pll_ref");
158 pll_in = devm_clk_get(dev, "pll_in");
159 if (!IS_ERR(pll_ref))
160 mout_audss_p[0] = __clk_get_name(pll_ref);
161 if (!IS_ERR(pll_in)) {
162 mout_audss_p[1] = __clk_get_name(pll_in);
163
164 if (variant->enable_epll) {
165 epll = pll_in;
166
167 ret = clk_prepare_enable(epll);
168 if (ret) {
169 dev_err(dev,
170 "failed to prepare the epll clock\n");
171 return ret;
172 }
173 }
174 }
175
176
177
178
179
180
181
182 pm_runtime_get_noresume(dev);
183 pm_runtime_set_active(dev);
184 pm_runtime_enable(dev);
185
186 clk_table[EXYNOS_MOUT_AUDSS] = clk_hw_register_mux(dev, "mout_audss",
187 mout_audss_p, ARRAY_SIZE(mout_audss_p),
188 CLK_SET_RATE_NO_REPARENT | CLK_SET_RATE_PARENT,
189 reg_base + ASS_CLK_SRC, 0, 1, 0, &lock);
190
191 cdclk = devm_clk_get(dev, "cdclk");
192 sclk_audio = devm_clk_get(dev, "sclk_audio");
193 if (!IS_ERR(cdclk))
194 mout_i2s_p[1] = __clk_get_name(cdclk);
195 if (!IS_ERR(sclk_audio))
196 mout_i2s_p[2] = __clk_get_name(sclk_audio);
197 clk_table[EXYNOS_MOUT_I2S] = clk_hw_register_mux(dev, "mout_i2s",
198 mout_i2s_p, ARRAY_SIZE(mout_i2s_p),
199 CLK_SET_RATE_NO_REPARENT,
200 reg_base + ASS_CLK_SRC, 2, 2, 0, &lock);
201
202 clk_table[EXYNOS_DOUT_SRP] = clk_hw_register_divider(dev, "dout_srp",
203 "mout_audss", CLK_SET_RATE_PARENT,
204 reg_base + ASS_CLK_DIV, 0, 4, 0, &lock);
205
206 clk_table[EXYNOS_DOUT_AUD_BUS] = clk_hw_register_divider(dev,
207 "dout_aud_bus", "dout_srp", CLK_SET_RATE_PARENT,
208 reg_base + ASS_CLK_DIV, 4, 4, 0, &lock);
209
210 clk_table[EXYNOS_DOUT_I2S] = clk_hw_register_divider(dev, "dout_i2s",
211 "mout_i2s", 0, reg_base + ASS_CLK_DIV, 8, 4, 0,
212 &lock);
213
214 clk_table[EXYNOS_SRP_CLK] = clk_hw_register_gate(dev, "srp_clk",
215 "dout_srp", CLK_SET_RATE_PARENT,
216 reg_base + ASS_CLK_GATE, 0, 0, &lock);
217
218 clk_table[EXYNOS_I2S_BUS] = clk_hw_register_gate(dev, "i2s_bus",
219 "dout_aud_bus", CLK_SET_RATE_PARENT,
220 reg_base + ASS_CLK_GATE, 2, 0, &lock);
221
222 clk_table[EXYNOS_SCLK_I2S] = clk_hw_register_gate(dev, "sclk_i2s",
223 "dout_i2s", CLK_SET_RATE_PARENT,
224 reg_base + ASS_CLK_GATE, 3, 0, &lock);
225
226 clk_table[EXYNOS_PCM_BUS] = clk_hw_register_gate(dev, "pcm_bus",
227 "sclk_pcm", CLK_SET_RATE_PARENT,
228 reg_base + ASS_CLK_GATE, 4, 0, &lock);
229
230 sclk_pcm_in = devm_clk_get(dev, "sclk_pcm_in");
231 if (!IS_ERR(sclk_pcm_in))
232 sclk_pcm_p = __clk_get_name(sclk_pcm_in);
233 clk_table[EXYNOS_SCLK_PCM] = clk_hw_register_gate(dev, "sclk_pcm",
234 sclk_pcm_p, CLK_SET_RATE_PARENT,
235 reg_base + ASS_CLK_GATE, 5, 0, &lock);
236
237 if (variant->has_adma_clk) {
238 clk_table[EXYNOS_ADMA] = clk_hw_register_gate(dev, "adma",
239 "dout_srp", CLK_SET_RATE_PARENT,
240 reg_base + ASS_CLK_GATE, 9, 0, &lock);
241 }
242
243 for (i = 0; i < clk_data->num; i++) {
244 if (IS_ERR(clk_table[i])) {
245 dev_err(dev, "failed to register clock %d\n", i);
246 ret = PTR_ERR(clk_table[i]);
247 goto unregister;
248 }
249 }
250
251 ret = of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
252 clk_data);
253 if (ret) {
254 dev_err(dev, "failed to add clock provider\n");
255 goto unregister;
256 }
257
258 pm_runtime_put_sync(dev);
259
260 return 0;
261
262unregister:
263 exynos_audss_clk_teardown();
264 pm_runtime_put_sync(dev);
265 pm_runtime_disable(dev);
266
267 if (!IS_ERR(epll))
268 clk_disable_unprepare(epll);
269
270 return ret;
271}
272
273static int exynos_audss_clk_remove(struct platform_device *pdev)
274{
275 of_clk_del_provider(pdev->dev.of_node);
276
277 exynos_audss_clk_teardown();
278 pm_runtime_disable(&pdev->dev);
279
280 if (!IS_ERR(epll))
281 clk_disable_unprepare(epll);
282
283 return 0;
284}
285
286static const struct dev_pm_ops exynos_audss_clk_pm_ops = {
287 SET_RUNTIME_PM_OPS(exynos_audss_clk_suspend, exynos_audss_clk_resume,
288 NULL)
289 SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
290 pm_runtime_force_resume)
291};
292
293static struct platform_driver exynos_audss_clk_driver = {
294 .driver = {
295 .name = "exynos-audss-clk",
296 .of_match_table = exynos_audss_clk_of_match,
297 .pm = &exynos_audss_clk_pm_ops,
298 },
299 .probe = exynos_audss_clk_probe,
300 .remove = exynos_audss_clk_remove,
301};
302
303module_platform_driver(exynos_audss_clk_driver);
304
305MODULE_AUTHOR("Padmavathi Venna <padma.v@samsung.com>");
306MODULE_DESCRIPTION("Exynos Audio Subsystem Clock Controller");
307MODULE_LICENSE("GPL v2");
308MODULE_ALIAS("platform:exynos-audss-clk");
309
