1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * IMG parallel output controller driver
4 *
5 * Copyright (C) 2015 Imagination Technologies Ltd.
6 *
7 * Author: Damien Horsley <Damien.Horsley@imgtec.com>
8 */
9
10#include <linux/clk.h>
11#include <linux/init.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/platform_device.h>
16#include <linux/pm_runtime.h>
17#include <linux/reset.h>
18
19#include <sound/core.h>
20#include <sound/dmaengine_pcm.h>
21#include <sound/initval.h>
22#include <sound/pcm.h>
23#include <sound/pcm_params.h>
24#include <sound/soc.h>
25
26#define IMG_PRL_OUT_TX_FIFO 0
27
28#define IMG_PRL_OUT_CTL 0x4
29#define IMG_PRL_OUT_CTL_CH_MASK BIT(4)
30#define IMG_PRL_OUT_CTL_PACKH_MASK BIT(3)
31#define IMG_PRL_OUT_CTL_EDGE_MASK BIT(2)
32#define IMG_PRL_OUT_CTL_ME_MASK BIT(1)
33#define IMG_PRL_OUT_CTL_SRST_MASK BIT(0)
34
35struct img_prl_out {
36 void __iomem *base;
37 struct clk *clk_sys;
38 struct clk *clk_ref;
39 struct snd_dmaengine_dai_dma_data dma_data;
40 struct device *dev;
41 struct reset_control *rst;
42};
43
44static int img_prl_out_suspend(struct device *dev)
45{
46 struct img_prl_out *prl = dev_get_drvdata(dev);
47
48 clk_disable_unprepare(clk: prl->clk_ref);
49
50 return 0;
51}
52
53static int img_prl_out_resume(struct device *dev)
54{
55 struct img_prl_out *prl = dev_get_drvdata(dev);
56 int ret;
57
58 ret = clk_prepare_enable(clk: prl->clk_ref);
59 if (ret) {
60 dev_err(dev, "clk_enable failed: %d\n", ret);
61 return ret;
62 }
63
64 return 0;
65}
66
67static inline void img_prl_out_writel(struct img_prl_out *prl,
68 u32 val, u32 reg)
69{
70 writel(val, addr: prl->base + reg);
71}
72
73static inline u32 img_prl_out_readl(struct img_prl_out *prl, u32 reg)
74{
75 return readl(addr: prl->base + reg);
76}
77
78static void img_prl_out_reset(struct img_prl_out *prl)
79{
80 u32 ctl;
81
82 ctl = img_prl_out_readl(prl, IMG_PRL_OUT_CTL) &
83 ~IMG_PRL_OUT_CTL_ME_MASK;
84
85 reset_control_assert(rstc: prl->rst);
86 reset_control_deassert(rstc: prl->rst);
87
88 img_prl_out_writel(prl, val: ctl, IMG_PRL_OUT_CTL);
89}
90
91static int img_prl_out_trigger(struct snd_pcm_substream *substream, int cmd,
92 struct snd_soc_dai *dai)
93{
94 struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai);
95 u32 reg;
96
97 switch (cmd) {
98 case SNDRV_PCM_TRIGGER_START:
99 case SNDRV_PCM_TRIGGER_RESUME:
100 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
101 reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL);
102 reg |= IMG_PRL_OUT_CTL_ME_MASK;
103 img_prl_out_writel(prl, val: reg, IMG_PRL_OUT_CTL);
104 break;
105 case SNDRV_PCM_TRIGGER_STOP:
106 case SNDRV_PCM_TRIGGER_SUSPEND:
107 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
108 img_prl_out_reset(prl);
109 break;
110 default:
111 return -EINVAL;
112 }
113
114 return 0;
115}
116
117static int img_prl_out_hw_params(struct snd_pcm_substream *substream,
118 struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
119{
120 struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai);
121 unsigned int rate, channels;
122 u32 reg, control_set = 0;
123
124 rate = params_rate(p: params);
125 channels = params_channels(p: params);
126
127 switch (params_format(p: params)) {
128 case SNDRV_PCM_FORMAT_S32_LE:
129 control_set |= IMG_PRL_OUT_CTL_PACKH_MASK;
130 break;
131 case SNDRV_PCM_FORMAT_S24_LE:
132 break;
133 default:
134 return -EINVAL;
135 }
136
137 if (channels != 2)
138 return -EINVAL;
139
140 clk_set_rate(clk: prl->clk_ref, rate: rate * 256);
141
142 reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL);
143 reg = (reg & ~IMG_PRL_OUT_CTL_PACKH_MASK) | control_set;
144 img_prl_out_writel(prl, val: reg, IMG_PRL_OUT_CTL);
145
146 return 0;
147}
148
149static int img_prl_out_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
150{
151 struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai);
152 u32 reg, control_set = 0;
153 int ret;
154
155 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
156 case SND_SOC_DAIFMT_NB_NF:
157 break;
158 case SND_SOC_DAIFMT_NB_IF:
159 control_set |= IMG_PRL_OUT_CTL_EDGE_MASK;
160 break;
161 default:
162 return -EINVAL;
163 }
164
165 ret = pm_runtime_resume_and_get(dev: prl->dev);
166 if (ret < 0)
167 return ret;
168
169 reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL);
170 reg = (reg & ~IMG_PRL_OUT_CTL_EDGE_MASK) | control_set;
171 img_prl_out_writel(prl, val: reg, IMG_PRL_OUT_CTL);
172 pm_runtime_put(dev: prl->dev);
173
174 return 0;
175}
176
177static int img_prl_out_dai_probe(struct snd_soc_dai *dai)
178{
179 struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai);
180
181 snd_soc_dai_init_dma_data(dai, playback: &prl->dma_data, NULL);
182
183 return 0;
184}
185
186static const struct snd_soc_dai_ops img_prl_out_dai_ops = {
187 .probe = img_prl_out_dai_probe,
188 .trigger = img_prl_out_trigger,
189 .hw_params = img_prl_out_hw_params,
190 .set_fmt = img_prl_out_set_fmt
191};
192
193static struct snd_soc_dai_driver img_prl_out_dai = {
194 .playback = {
195 .channels_min = 2,
196 .channels_max = 2,
197 .rates = SNDRV_PCM_RATE_8000_192000,
198 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S24_LE
199 },
200 .ops = &img_prl_out_dai_ops
201};
202
203static const struct snd_soc_component_driver img_prl_out_component = {
204 .name = "img-prl-out",
205 .legacy_dai_naming = 1,
206};
207
208static int img_prl_out_probe(struct platform_device *pdev)
209{
210 struct img_prl_out *prl;
211 struct resource *res;
212 void __iomem *base;
213 int ret;
214 struct device *dev = &pdev->dev;
215
216 prl = devm_kzalloc(dev: &pdev->dev, size: sizeof(*prl), GFP_KERNEL);
217 if (!prl)
218 return -ENOMEM;
219
220 platform_set_drvdata(pdev, data: prl);
221
222 prl->dev = &pdev->dev;
223
224 base = devm_platform_get_and_ioremap_resource(pdev, index: 0, res: &res);
225 if (IS_ERR(ptr: base))
226 return PTR_ERR(ptr: base);
227
228 prl->base = base;
229
230 prl->rst = devm_reset_control_get_exclusive(dev: &pdev->dev, id: "rst");
231 if (IS_ERR(ptr: prl->rst))
232 return dev_err_probe(dev: &pdev->dev, err: PTR_ERR(ptr: prl->rst),
233 fmt: "No top level reset found\n");
234
235 prl->clk_sys = devm_clk_get(dev: &pdev->dev, id: "sys");
236 if (IS_ERR(ptr: prl->clk_sys))
237 return dev_err_probe(dev, err: PTR_ERR(ptr: prl->clk_sys),
238 fmt: "Failed to acquire clock 'sys'\n");
239
240 prl->clk_ref = devm_clk_get(dev: &pdev->dev, id: "ref");
241 if (IS_ERR(ptr: prl->clk_ref))
242 return dev_err_probe(dev, err: PTR_ERR(ptr: prl->clk_ref),
243 fmt: "Failed to acquire clock 'ref'\n");
244
245 ret = clk_prepare_enable(clk: prl->clk_sys);
246 if (ret)
247 return ret;
248
249 img_prl_out_writel(prl, IMG_PRL_OUT_CTL_EDGE_MASK, IMG_PRL_OUT_CTL);
250 img_prl_out_reset(prl);
251
252 pm_runtime_enable(dev: &pdev->dev);
253 if (!pm_runtime_enabled(dev: &pdev->dev)) {
254 ret = img_prl_out_resume(dev: &pdev->dev);
255 if (ret)
256 goto err_pm_disable;
257 }
258
259 prl->dma_data.addr = res->start + IMG_PRL_OUT_TX_FIFO;
260 prl->dma_data.addr_width = 4;
261 prl->dma_data.maxburst = 4;
262
263 ret = devm_snd_soc_register_component(dev: &pdev->dev,
264 component_driver: &img_prl_out_component,
265 dai_drv: &img_prl_out_dai, num_dai: 1);
266 if (ret)
267 goto err_suspend;
268
269 ret = devm_snd_dmaengine_pcm_register(dev: &pdev->dev, NULL, flags: 0);
270 if (ret)
271 goto err_suspend;
272
273 return 0;
274
275err_suspend:
276 if (!pm_runtime_status_suspended(dev: &pdev->dev))
277 img_prl_out_suspend(dev: &pdev->dev);
278err_pm_disable:
279 pm_runtime_disable(dev: &pdev->dev);
280 clk_disable_unprepare(clk: prl->clk_sys);
281
282 return ret;
283}
284
285static void img_prl_out_dev_remove(struct platform_device *pdev)
286{
287 struct img_prl_out *prl = platform_get_drvdata(pdev);
288
289 pm_runtime_disable(dev: &pdev->dev);
290 if (!pm_runtime_status_suspended(dev: &pdev->dev))
291 img_prl_out_suspend(dev: &pdev->dev);
292
293 clk_disable_unprepare(clk: prl->clk_sys);
294}
295
296static const struct of_device_id img_prl_out_of_match[] = {
297 { .compatible = "img,parallel-out" },
298 {}
299};
300MODULE_DEVICE_TABLE(of, img_prl_out_of_match);
301
302static const struct dev_pm_ops img_prl_out_pm_ops = {
303 RUNTIME_PM_OPS(img_prl_out_suspend, img_prl_out_resume, NULL)
304};
305
306static struct platform_driver img_prl_out_driver = {
307 .driver = {
308 .name = "img-parallel-out",
309 .of_match_table = img_prl_out_of_match,
310 .pm = pm_ptr(&img_prl_out_pm_ops)
311 },
312 .probe = img_prl_out_probe,
313 .remove = img_prl_out_dev_remove
314};
315module_platform_driver(img_prl_out_driver);
316
317MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
318MODULE_DESCRIPTION("IMG Parallel Output Driver");
319MODULE_LICENSE("GPL v2");
320

source code of linux/sound/soc/img/img-parallel-out.c