1 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
3 // Copyright (c) 2018 BayLibre, SAS.
4 // Author: Jerome Brunet <jbrunet@baylibre.com>
7 #include <linux/module.h>
8 #include <linux/of_platform.h>
9 #include <linux/regmap.h>
10 #include <sound/soc.h>
12 #include "axg-tdm-formatter.h"
14 struct axg_tdm_formatter {
15 struct list_head list;
16 struct axg_tdm_stream *stream;
17 const struct axg_tdm_formatter_driver *drv;
22 struct clk *lrclk_sel;
27 int axg_tdm_formatter_set_channel_masks(struct regmap *map,
28 struct axg_tdm_stream *ts,
31 unsigned int ch = ts->channels;
32 u32 val[AXG_TDM_NUM_LANES];
36 * We need to mimick the slot distribution used by the HW to keep the
37 * channel placement consistent regardless of the number of channel
38 * in the stream. This is why the odd algorithm below is used.
40 memset(val, 0, sizeof(*val) * AXG_TDM_NUM_LANES);
43 * Distribute the channels of the stream over the available slots
44 * of each TDM lane. We need to go over the 32 slots ...
46 for (i = 0; (i < 32) && ch; i += 2) {
47 /* ... of all the lanes ... */
48 for (j = 0; j < AXG_TDM_NUM_LANES; j++) {
49 /* ... then distribute the channels in pairs */
50 for (k = 0; k < 2; k++) {
51 if ((BIT(i + k) & ts->mask[j]) && ch) {
60 * If we still have channel left at the end of the process, it means
61 * the stream has more channels than we can accommodate and we should
62 * have caught this earlier.
64 if (WARN_ON(ch != 0)) {
65 pr_err("channel mask error\n");
69 for (i = 0; i < AXG_TDM_NUM_LANES; i++) {
70 regmap_write(map, offset, val[i]);
71 offset += regmap_get_reg_stride(map);
76 EXPORT_SYMBOL_GPL(axg_tdm_formatter_set_channel_masks);
78 static int axg_tdm_formatter_enable(struct axg_tdm_formatter *formatter)
80 struct axg_tdm_stream *ts = formatter->stream;
81 bool invert = formatter->drv->invert_sclk;
84 /* Do nothing if the formatter is already enabled */
85 if (formatter->enabled)
89 * If sclk is inverted, invert it back and provide the inversion
90 * required by the formatter
92 invert ^= axg_tdm_sclk_invert(ts->iface->fmt);
93 ret = clk_set_phase(formatter->sclk, invert ? 180 : 0);
97 /* Setup the stream parameter in the formatter */
98 ret = formatter->drv->ops->prepare(formatter->map, formatter->stream);
102 /* Enable the signal clocks feeding the formatter */
103 ret = clk_prepare_enable(formatter->sclk);
107 ret = clk_prepare_enable(formatter->lrclk);
109 clk_disable_unprepare(formatter->sclk);
113 /* Finally, actually enable the formatter */
114 formatter->drv->ops->enable(formatter->map);
115 formatter->enabled = true;
120 static void axg_tdm_formatter_disable(struct axg_tdm_formatter *formatter)
122 /* Do nothing if the formatter is already disabled */
123 if (!formatter->enabled)
126 formatter->drv->ops->disable(formatter->map);
127 clk_disable_unprepare(formatter->lrclk);
128 clk_disable_unprepare(formatter->sclk);
129 formatter->enabled = false;
132 static int axg_tdm_formatter_attach(struct axg_tdm_formatter *formatter)
134 struct axg_tdm_stream *ts = formatter->stream;
137 mutex_lock(&ts->lock);
139 /* Catch up if the stream is already running when we attach */
141 ret = axg_tdm_formatter_enable(formatter);
143 pr_err("failed to enable formatter\n");
148 list_add_tail(&formatter->list, &ts->formatter_list);
150 mutex_unlock(&ts->lock);
154 static void axg_tdm_formatter_dettach(struct axg_tdm_formatter *formatter)
156 struct axg_tdm_stream *ts = formatter->stream;
158 mutex_lock(&ts->lock);
159 list_del(&formatter->list);
160 mutex_unlock(&ts->lock);
162 axg_tdm_formatter_disable(formatter);
165 static int axg_tdm_formatter_power_up(struct axg_tdm_formatter *formatter,
166 struct snd_soc_dapm_widget *w)
168 struct axg_tdm_stream *ts = formatter->drv->ops->get_stream(w);
172 * If we don't get a stream at this stage, it would mean that the
173 * widget is powering up but is not attached to any backend DAI.
174 * It should not happen, ever !
179 /* Clock our device */
180 ret = clk_prepare_enable(formatter->pclk);
184 /* Reparent the bit clock to the TDM interface */
185 ret = clk_set_parent(formatter->sclk_sel, ts->iface->sclk);
189 /* Reparent the sample clock to the TDM interface */
190 ret = clk_set_parent(formatter->lrclk_sel, ts->iface->lrclk);
194 formatter->stream = ts;
195 ret = axg_tdm_formatter_attach(formatter);
202 clk_disable_unprepare(formatter->pclk);
206 static void axg_tdm_formatter_power_down(struct axg_tdm_formatter *formatter)
208 axg_tdm_formatter_dettach(formatter);
209 clk_disable_unprepare(formatter->pclk);
210 formatter->stream = NULL;
213 int axg_tdm_formatter_event(struct snd_soc_dapm_widget *w,
214 struct snd_kcontrol *control,
217 struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
218 struct axg_tdm_formatter *formatter = snd_soc_component_get_drvdata(c);
222 case SND_SOC_DAPM_PRE_PMU:
223 ret = axg_tdm_formatter_power_up(formatter, w);
226 case SND_SOC_DAPM_PRE_PMD:
227 axg_tdm_formatter_power_down(formatter);
231 dev_err(c->dev, "Unexpected event %d\n", event);
237 EXPORT_SYMBOL_GPL(axg_tdm_formatter_event);
239 int axg_tdm_formatter_probe(struct platform_device *pdev)
241 struct device *dev = &pdev->dev;
242 const struct axg_tdm_formatter_driver *drv;
243 struct axg_tdm_formatter *formatter;
244 struct resource *res;
248 drv = of_device_get_match_data(dev);
250 dev_err(dev, "failed to match device\n");
254 formatter = devm_kzalloc(dev, sizeof(*formatter), GFP_KERNEL);
257 platform_set_drvdata(pdev, formatter);
258 formatter->drv = drv;
260 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
261 regs = devm_ioremap_resource(dev, res);
263 return PTR_ERR(regs);
265 formatter->map = devm_regmap_init_mmio(dev, regs, drv->regmap_cfg);
266 if (IS_ERR(formatter->map)) {
267 dev_err(dev, "failed to init regmap: %ld\n",
268 PTR_ERR(formatter->map));
269 return PTR_ERR(formatter->map);
272 /* Peripharal clock */
273 formatter->pclk = devm_clk_get(dev, "pclk");
274 if (IS_ERR(formatter->pclk)) {
275 ret = PTR_ERR(formatter->pclk);
276 if (ret != -EPROBE_DEFER)
277 dev_err(dev, "failed to get pclk: %d\n", ret);
281 /* Formatter bit clock */
282 formatter->sclk = devm_clk_get(dev, "sclk");
283 if (IS_ERR(formatter->sclk)) {
284 ret = PTR_ERR(formatter->sclk);
285 if (ret != -EPROBE_DEFER)
286 dev_err(dev, "failed to get sclk: %d\n", ret);
290 /* Formatter sample clock */
291 formatter->lrclk = devm_clk_get(dev, "lrclk");
292 if (IS_ERR(formatter->lrclk)) {
293 ret = PTR_ERR(formatter->lrclk);
294 if (ret != -EPROBE_DEFER)
295 dev_err(dev, "failed to get lrclk: %d\n", ret);
299 /* Formatter bit clock input multiplexer */
300 formatter->sclk_sel = devm_clk_get(dev, "sclk_sel");
301 if (IS_ERR(formatter->sclk_sel)) {
302 ret = PTR_ERR(formatter->sclk_sel);
303 if (ret != -EPROBE_DEFER)
304 dev_err(dev, "failed to get sclk_sel: %d\n", ret);
308 /* Formatter sample clock input multiplexer */
309 formatter->lrclk_sel = devm_clk_get(dev, "lrclk_sel");
310 if (IS_ERR(formatter->lrclk_sel)) {
311 ret = PTR_ERR(formatter->lrclk_sel);
312 if (ret != -EPROBE_DEFER)
313 dev_err(dev, "failed to get lrclk_sel: %d\n", ret);
317 return devm_snd_soc_register_component(dev, drv->component_drv,
320 EXPORT_SYMBOL_GPL(axg_tdm_formatter_probe);
322 int axg_tdm_stream_start(struct axg_tdm_stream *ts)
324 struct axg_tdm_formatter *formatter;
327 mutex_lock(&ts->lock);
330 /* Start all the formatters attached to the stream */
331 list_for_each_entry(formatter, &ts->formatter_list, list) {
332 ret = axg_tdm_formatter_enable(formatter);
334 pr_err("failed to start tdm stream\n");
340 mutex_unlock(&ts->lock);
343 EXPORT_SYMBOL_GPL(axg_tdm_stream_start);
345 void axg_tdm_stream_stop(struct axg_tdm_stream *ts)
347 struct axg_tdm_formatter *formatter;
349 mutex_lock(&ts->lock);
352 /* Stop all the formatters attached to the stream */
353 list_for_each_entry(formatter, &ts->formatter_list, list) {
354 axg_tdm_formatter_disable(formatter);
357 mutex_unlock(&ts->lock);
359 EXPORT_SYMBOL_GPL(axg_tdm_stream_stop);
361 struct axg_tdm_stream *axg_tdm_stream_alloc(struct axg_tdm_iface *iface)
363 struct axg_tdm_stream *ts;
365 ts = kzalloc(sizeof(*ts), GFP_KERNEL);
367 INIT_LIST_HEAD(&ts->formatter_list);
368 mutex_init(&ts->lock);
374 EXPORT_SYMBOL_GPL(axg_tdm_stream_alloc);
376 void axg_tdm_stream_free(struct axg_tdm_stream *ts)
379 * If the list is not empty, it would mean that one of the formatter
380 * widget is still powered and attached to the interface while we
381 * we are removing the TDM DAI. It should not be possible
383 WARN_ON(!list_empty(&ts->formatter_list));
384 mutex_destroy(&ts->lock);
387 EXPORT_SYMBOL_GPL(axg_tdm_stream_free);
389 MODULE_DESCRIPTION("Amlogic AXG TDM formatter driver");
390 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
391 MODULE_LICENSE("GPL v2");