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Linux/drivers/clk/samsung/clk-exynos-audss.c

  1 /*
  2  * Copyright (c) 2013 Samsung Electronics Co., Ltd.
  3  * Author: Padmavathi Venna <padma.v@samsung.com>
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License version 2 as
  7  * published by the Free Software Foundation.
  8  *
  9  * Common Clock Framework support for Audio Subsystem Clock Controller.
 10 */
 11 
 12 #include <linux/clkdev.h>
 13 #include <linux/io.h>
 14 #include <linux/clk-provider.h>
 15 #include <linux/of_address.h>
 16 #include <linux/syscore_ops.h>
 17 #include <linux/module.h>
 18 #include <linux/platform_device.h>
 19 
 20 #include <dt-bindings/clock/exynos-audss-clk.h>
 21 
 22 enum exynos_audss_clk_type {
 23         TYPE_EXYNOS4210,
 24         TYPE_EXYNOS5250,
 25         TYPE_EXYNOS5420,
 26 };
 27 
 28 static DEFINE_SPINLOCK(lock);
 29 static struct clk **clk_table;
 30 static void __iomem *reg_base;
 31 static struct clk_onecell_data clk_data;
 32 /*
 33  * On Exynos5420 this will be a clock which has to be enabled before any
 34  * access to audss registers. Typically a child of EPLL.
 35  *
 36  * On other platforms this will be -ENODEV.
 37  */
 38 static struct clk *epll;
 39 
 40 #define ASS_CLK_SRC 0x0
 41 #define ASS_CLK_DIV 0x4
 42 #define ASS_CLK_GATE 0x8
 43 
 44 #ifdef CONFIG_PM_SLEEP
 45 static unsigned long reg_save[][2] = {
 46         {ASS_CLK_SRC,  0},
 47         {ASS_CLK_DIV,  0},
 48         {ASS_CLK_GATE, 0},
 49 };
 50 
 51 static int exynos_audss_clk_suspend(void)
 52 {
 53         int i;
 54 
 55         for (i = 0; i < ARRAY_SIZE(reg_save); i++)
 56                 reg_save[i][1] = readl(reg_base + reg_save[i][0]);
 57 
 58         return 0;
 59 }
 60 
 61 static void exynos_audss_clk_resume(void)
 62 {
 63         int i;
 64 
 65         for (i = 0; i < ARRAY_SIZE(reg_save); i++)
 66                 writel(reg_save[i][1], reg_base + reg_save[i][0]);
 67 }
 68 
 69 static struct syscore_ops exynos_audss_clk_syscore_ops = {
 70         .suspend        = exynos_audss_clk_suspend,
 71         .resume         = exynos_audss_clk_resume,
 72 };
 73 #endif /* CONFIG_PM_SLEEP */
 74 
 75 static const struct of_device_id exynos_audss_clk_of_match[] = {
 76         { .compatible = "samsung,exynos4210-audss-clock",
 77           .data = (void *)TYPE_EXYNOS4210, },
 78         { .compatible = "samsung,exynos5250-audss-clock",
 79           .data = (void *)TYPE_EXYNOS5250, },
 80         { .compatible = "samsung,exynos5420-audss-clock",
 81           .data = (void *)TYPE_EXYNOS5420, },
 82         {},
 83 };
 84 
 85 /* register exynos_audss clocks */
 86 static int exynos_audss_clk_probe(struct platform_device *pdev)
 87 {
 88         int i, ret = 0;
 89         struct resource *res;
 90         const char *mout_audss_p[] = {"fin_pll", "fout_epll"};
 91         const char *mout_i2s_p[] = {"mout_audss", "cdclk0", "sclk_audio0"};
 92         const char *sclk_pcm_p = "sclk_pcm0";
 93         struct clk *pll_ref, *pll_in, *cdclk, *sclk_audio, *sclk_pcm_in;
 94         const struct of_device_id *match;
 95         enum exynos_audss_clk_type variant;
 96 
 97         match = of_match_node(exynos_audss_clk_of_match, pdev->dev.of_node);
 98         if (!match)
 99                 return -EINVAL;
100         variant = (enum exynos_audss_clk_type)match->data;
101 
102         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
103         reg_base = devm_ioremap_resource(&pdev->dev, res);
104         if (IS_ERR(reg_base)) {
105                 dev_err(&pdev->dev, "failed to map audss registers\n");
106                 return PTR_ERR(reg_base);
107         }
108         /* EPLL don't have to be enabled for boards other than Exynos5420 */
109         epll = ERR_PTR(-ENODEV);
110 
111         clk_table = devm_kzalloc(&pdev->dev,
112                                 sizeof(struct clk *) * EXYNOS_AUDSS_MAX_CLKS,
113                                 GFP_KERNEL);
114         if (!clk_table)
115                 return -ENOMEM;
116 
117         clk_data.clks = clk_table;
118         if (variant == TYPE_EXYNOS5420)
119                 clk_data.clk_num = EXYNOS_AUDSS_MAX_CLKS;
120         else
121                 clk_data.clk_num = EXYNOS_AUDSS_MAX_CLKS - 1;
122 
123         pll_ref = devm_clk_get(&pdev->dev, "pll_ref");
124         pll_in = devm_clk_get(&pdev->dev, "pll_in");
125         if (!IS_ERR(pll_ref))
126                 mout_audss_p[0] = __clk_get_name(pll_ref);
127         if (!IS_ERR(pll_in)) {
128                 mout_audss_p[1] = __clk_get_name(pll_in);
129 
130                 if (variant == TYPE_EXYNOS5420) {
131                         epll = pll_in;
132 
133                         ret = clk_prepare_enable(epll);
134                         if (ret) {
135                                 dev_err(&pdev->dev,
136                                                 "failed to prepare the epll clock\n");
137                                 return ret;
138                         }
139                 }
140         }
141         clk_table[EXYNOS_MOUT_AUDSS] = clk_register_mux(NULL, "mout_audss",
142                                 mout_audss_p, ARRAY_SIZE(mout_audss_p),
143                                 CLK_SET_RATE_NO_REPARENT,
144                                 reg_base + ASS_CLK_SRC, 0, 1, 0, &lock);
145 
146         cdclk = devm_clk_get(&pdev->dev, "cdclk");
147         sclk_audio = devm_clk_get(&pdev->dev, "sclk_audio");
148         if (!IS_ERR(cdclk))
149                 mout_i2s_p[1] = __clk_get_name(cdclk);
150         if (!IS_ERR(sclk_audio))
151                 mout_i2s_p[2] = __clk_get_name(sclk_audio);
152         clk_table[EXYNOS_MOUT_I2S] = clk_register_mux(NULL, "mout_i2s",
153                                 mout_i2s_p, ARRAY_SIZE(mout_i2s_p),
154                                 CLK_SET_RATE_NO_REPARENT,
155                                 reg_base + ASS_CLK_SRC, 2, 2, 0, &lock);
156 
157         clk_table[EXYNOS_DOUT_SRP] = clk_register_divider(NULL, "dout_srp",
158                                 "mout_audss", 0, reg_base + ASS_CLK_DIV, 0, 4,
159                                 0, &lock);
160 
161         clk_table[EXYNOS_DOUT_AUD_BUS] = clk_register_divider(NULL,
162                                 "dout_aud_bus", "dout_srp", 0,
163                                 reg_base + ASS_CLK_DIV, 4, 4, 0, &lock);
164 
165         clk_table[EXYNOS_DOUT_I2S] = clk_register_divider(NULL, "dout_i2s",
166                                 "mout_i2s", 0, reg_base + ASS_CLK_DIV, 8, 4, 0,
167                                 &lock);
168 
169         clk_table[EXYNOS_SRP_CLK] = clk_register_gate(NULL, "srp_clk",
170                                 "dout_srp", CLK_SET_RATE_PARENT,
171                                 reg_base + ASS_CLK_GATE, 0, 0, &lock);
172 
173         clk_table[EXYNOS_I2S_BUS] = clk_register_gate(NULL, "i2s_bus",
174                                 "dout_aud_bus", CLK_SET_RATE_PARENT,
175                                 reg_base + ASS_CLK_GATE, 2, 0, &lock);
176 
177         clk_table[EXYNOS_SCLK_I2S] = clk_register_gate(NULL, "sclk_i2s",
178                                 "dout_i2s", CLK_SET_RATE_PARENT,
179                                 reg_base + ASS_CLK_GATE, 3, 0, &lock);
180 
181         clk_table[EXYNOS_PCM_BUS] = clk_register_gate(NULL, "pcm_bus",
182                                  "sclk_pcm", CLK_SET_RATE_PARENT,
183                                 reg_base + ASS_CLK_GATE, 4, 0, &lock);
184 
185         sclk_pcm_in = devm_clk_get(&pdev->dev, "sclk_pcm_in");
186         if (!IS_ERR(sclk_pcm_in))
187                 sclk_pcm_p = __clk_get_name(sclk_pcm_in);
188         clk_table[EXYNOS_SCLK_PCM] = clk_register_gate(NULL, "sclk_pcm",
189                                 sclk_pcm_p, CLK_SET_RATE_PARENT,
190                                 reg_base + ASS_CLK_GATE, 5, 0, &lock);
191 
192         if (variant == TYPE_EXYNOS5420) {
193                 clk_table[EXYNOS_ADMA] = clk_register_gate(NULL, "adma",
194                                 "dout_srp", CLK_SET_RATE_PARENT,
195                                 reg_base + ASS_CLK_GATE, 9, 0, &lock);
196         }
197 
198         for (i = 0; i < clk_data.clk_num; i++) {
199                 if (IS_ERR(clk_table[i])) {
200                         dev_err(&pdev->dev, "failed to register clock %d\n", i);
201                         ret = PTR_ERR(clk_table[i]);
202                         goto unregister;
203                 }
204         }
205 
206         ret = of_clk_add_provider(pdev->dev.of_node, of_clk_src_onecell_get,
207                                         &clk_data);
208         if (ret) {
209                 dev_err(&pdev->dev, "failed to add clock provider\n");
210                 goto unregister;
211         }
212 
213 #ifdef CONFIG_PM_SLEEP
214         register_syscore_ops(&exynos_audss_clk_syscore_ops);
215 #endif
216 
217         dev_info(&pdev->dev, "setup completed\n");
218 
219         return 0;
220 
221 unregister:
222         for (i = 0; i < clk_data.clk_num; i++) {
223                 if (!IS_ERR(clk_table[i]))
224                         clk_unregister(clk_table[i]);
225         }
226 
227         if (!IS_ERR(epll))
228                 clk_disable_unprepare(epll);
229 
230         return ret;
231 }
232 
233 static int exynos_audss_clk_remove(struct platform_device *pdev)
234 {
235         int i;
236 
237 #ifdef CONFIG_PM_SLEEP
238         unregister_syscore_ops(&exynos_audss_clk_syscore_ops);
239 #endif
240 
241         of_clk_del_provider(pdev->dev.of_node);
242 
243         for (i = 0; i < clk_data.clk_num; i++) {
244                 if (!IS_ERR(clk_table[i]))
245                         clk_unregister(clk_table[i]);
246         }
247 
248         if (!IS_ERR(epll))
249                 clk_disable_unprepare(epll);
250 
251         return 0;
252 }
253 
254 static struct platform_driver exynos_audss_clk_driver = {
255         .driver = {
256                 .name = "exynos-audss-clk",
257                 .of_match_table = exynos_audss_clk_of_match,
258         },
259         .probe = exynos_audss_clk_probe,
260         .remove = exynos_audss_clk_remove,
261 };
262 
263 static int __init exynos_audss_clk_init(void)
264 {
265         return platform_driver_register(&exynos_audss_clk_driver);
266 }
267 core_initcall(exynos_audss_clk_init);
268 
269 static void __exit exynos_audss_clk_exit(void)
270 {
271         platform_driver_unregister(&exynos_audss_clk_driver);
272 }
273 module_exit(exynos_audss_clk_exit);
274 
275 MODULE_AUTHOR("Padmavathi Venna <padma.v@samsung.com>");
276 MODULE_DESCRIPTION("Exynos Audio Subsystem Clock Controller");
277 MODULE_LICENSE("GPL v2");
278 MODULE_ALIAS("platform:exynos-audss-clk");
279 

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