mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Kuninori Morimoto](/assets/img/avatar_default.png)
Use the dev_err_probe() helper, instead of open-coding the same operation. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Link: https://lore.kernel.org/r/20211214020843.2225831-17-kuninori.morimoto.gx@renesas.com Signed-off-by: Mark Brown <broonie@kernel.org>
387 lines
9.7 KiB
C
387 lines
9.7 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR MIT)
|
|
//
|
|
// Copyright (c) 2018 BayLibre, SAS.
|
|
// Author: Jerome Brunet <jbrunet@baylibre.com>
|
|
|
|
#include <linux/clk.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/reset.h>
|
|
#include <sound/soc.h>
|
|
|
|
#include "axg-tdm-formatter.h"
|
|
|
|
struct axg_tdm_formatter {
|
|
struct list_head list;
|
|
struct axg_tdm_stream *stream;
|
|
const struct axg_tdm_formatter_driver *drv;
|
|
struct clk *pclk;
|
|
struct clk *sclk;
|
|
struct clk *lrclk;
|
|
struct clk *sclk_sel;
|
|
struct clk *lrclk_sel;
|
|
struct reset_control *reset;
|
|
bool enabled;
|
|
struct regmap *map;
|
|
};
|
|
|
|
int axg_tdm_formatter_set_channel_masks(struct regmap *map,
|
|
struct axg_tdm_stream *ts,
|
|
unsigned int offset)
|
|
{
|
|
unsigned int val, ch = ts->channels;
|
|
unsigned long mask;
|
|
int i, j;
|
|
|
|
/*
|
|
* Distribute the channels of the stream over the available slots
|
|
* of each TDM lane
|
|
*/
|
|
for (i = 0; i < AXG_TDM_NUM_LANES; i++) {
|
|
val = 0;
|
|
mask = ts->mask[i];
|
|
|
|
for (j = find_first_bit(&mask, 32);
|
|
(j < 32) && ch;
|
|
j = find_next_bit(&mask, 32, j + 1)) {
|
|
val |= 1 << j;
|
|
ch -= 1;
|
|
}
|
|
|
|
regmap_write(map, offset, val);
|
|
offset += regmap_get_reg_stride(map);
|
|
}
|
|
|
|
/*
|
|
* If we still have channel left at the end of the process, it means
|
|
* the stream has more channels than we can accommodate and we should
|
|
* have caught this earlier.
|
|
*/
|
|
if (WARN_ON(ch != 0)) {
|
|
pr_err("channel mask error\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(axg_tdm_formatter_set_channel_masks);
|
|
|
|
static int axg_tdm_formatter_enable(struct axg_tdm_formatter *formatter)
|
|
{
|
|
struct axg_tdm_stream *ts = formatter->stream;
|
|
bool invert;
|
|
int ret;
|
|
|
|
/* Do nothing if the formatter is already enabled */
|
|
if (formatter->enabled)
|
|
return 0;
|
|
|
|
/*
|
|
* On the g12a (and possibly other SoCs), when a stream using
|
|
* multiple lanes is restarted, it will sometimes not start
|
|
* from the first lane, but randomly from another used one.
|
|
* The result is an unexpected and random channel shift.
|
|
*
|
|
* The hypothesis is that an HW counter is not properly reset
|
|
* and the formatter simply starts on the lane it stopped
|
|
* before. Unfortunately, there does not seems to be a way to
|
|
* reset this through the registers of the block.
|
|
*
|
|
* However, the g12a has indenpendent reset lines for each audio
|
|
* devices. Using this reset before each start solves the issue.
|
|
*/
|
|
ret = reset_control_reset(formatter->reset);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* If sclk is inverted, it means the bit should latched on the
|
|
* rising edge which is what our HW expects. If not, we need to
|
|
* invert it before the formatter.
|
|
*/
|
|
invert = axg_tdm_sclk_invert(ts->iface->fmt);
|
|
ret = clk_set_phase(formatter->sclk, invert ? 0 : 180);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Setup the stream parameter in the formatter */
|
|
ret = formatter->drv->ops->prepare(formatter->map,
|
|
formatter->drv->quirks,
|
|
formatter->stream);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Enable the signal clocks feeding the formatter */
|
|
ret = clk_prepare_enable(formatter->sclk);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = clk_prepare_enable(formatter->lrclk);
|
|
if (ret) {
|
|
clk_disable_unprepare(formatter->sclk);
|
|
return ret;
|
|
}
|
|
|
|
/* Finally, actually enable the formatter */
|
|
formatter->drv->ops->enable(formatter->map);
|
|
formatter->enabled = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void axg_tdm_formatter_disable(struct axg_tdm_formatter *formatter)
|
|
{
|
|
/* Do nothing if the formatter is already disabled */
|
|
if (!formatter->enabled)
|
|
return;
|
|
|
|
formatter->drv->ops->disable(formatter->map);
|
|
clk_disable_unprepare(formatter->lrclk);
|
|
clk_disable_unprepare(formatter->sclk);
|
|
formatter->enabled = false;
|
|
}
|
|
|
|
static int axg_tdm_formatter_attach(struct axg_tdm_formatter *formatter)
|
|
{
|
|
struct axg_tdm_stream *ts = formatter->stream;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&ts->lock);
|
|
|
|
/* Catch up if the stream is already running when we attach */
|
|
if (ts->ready) {
|
|
ret = axg_tdm_formatter_enable(formatter);
|
|
if (ret) {
|
|
pr_err("failed to enable formatter\n");
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
list_add_tail(&formatter->list, &ts->formatter_list);
|
|
out:
|
|
mutex_unlock(&ts->lock);
|
|
return ret;
|
|
}
|
|
|
|
static void axg_tdm_formatter_dettach(struct axg_tdm_formatter *formatter)
|
|
{
|
|
struct axg_tdm_stream *ts = formatter->stream;
|
|
|
|
mutex_lock(&ts->lock);
|
|
list_del(&formatter->list);
|
|
mutex_unlock(&ts->lock);
|
|
|
|
axg_tdm_formatter_disable(formatter);
|
|
}
|
|
|
|
static int axg_tdm_formatter_power_up(struct axg_tdm_formatter *formatter,
|
|
struct snd_soc_dapm_widget *w)
|
|
{
|
|
struct axg_tdm_stream *ts = formatter->drv->ops->get_stream(w);
|
|
int ret;
|
|
|
|
/*
|
|
* If we don't get a stream at this stage, it would mean that the
|
|
* widget is powering up but is not attached to any backend DAI.
|
|
* It should not happen, ever !
|
|
*/
|
|
if (WARN_ON(!ts))
|
|
return -ENODEV;
|
|
|
|
/* Clock our device */
|
|
ret = clk_prepare_enable(formatter->pclk);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Reparent the bit clock to the TDM interface */
|
|
ret = clk_set_parent(formatter->sclk_sel, ts->iface->sclk);
|
|
if (ret)
|
|
goto disable_pclk;
|
|
|
|
/* Reparent the sample clock to the TDM interface */
|
|
ret = clk_set_parent(formatter->lrclk_sel, ts->iface->lrclk);
|
|
if (ret)
|
|
goto disable_pclk;
|
|
|
|
formatter->stream = ts;
|
|
ret = axg_tdm_formatter_attach(formatter);
|
|
if (ret)
|
|
goto disable_pclk;
|
|
|
|
return 0;
|
|
|
|
disable_pclk:
|
|
clk_disable_unprepare(formatter->pclk);
|
|
return ret;
|
|
}
|
|
|
|
static void axg_tdm_formatter_power_down(struct axg_tdm_formatter *formatter)
|
|
{
|
|
axg_tdm_formatter_dettach(formatter);
|
|
clk_disable_unprepare(formatter->pclk);
|
|
formatter->stream = NULL;
|
|
}
|
|
|
|
int axg_tdm_formatter_event(struct snd_soc_dapm_widget *w,
|
|
struct snd_kcontrol *control,
|
|
int event)
|
|
{
|
|
struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
|
|
struct axg_tdm_formatter *formatter = snd_soc_component_get_drvdata(c);
|
|
int ret = 0;
|
|
|
|
switch (event) {
|
|
case SND_SOC_DAPM_PRE_PMU:
|
|
ret = axg_tdm_formatter_power_up(formatter, w);
|
|
break;
|
|
|
|
case SND_SOC_DAPM_PRE_PMD:
|
|
axg_tdm_formatter_power_down(formatter);
|
|
break;
|
|
|
|
default:
|
|
dev_err(c->dev, "Unexpected event %d\n", event);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(axg_tdm_formatter_event);
|
|
|
|
int axg_tdm_formatter_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
const struct axg_tdm_formatter_driver *drv;
|
|
struct axg_tdm_formatter *formatter;
|
|
void __iomem *regs;
|
|
|
|
drv = of_device_get_match_data(dev);
|
|
if (!drv) {
|
|
dev_err(dev, "failed to match device\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
formatter = devm_kzalloc(dev, sizeof(*formatter), GFP_KERNEL);
|
|
if (!formatter)
|
|
return -ENOMEM;
|
|
platform_set_drvdata(pdev, formatter);
|
|
formatter->drv = drv;
|
|
|
|
regs = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(regs))
|
|
return PTR_ERR(regs);
|
|
|
|
formatter->map = devm_regmap_init_mmio(dev, regs, drv->regmap_cfg);
|
|
if (IS_ERR(formatter->map)) {
|
|
dev_err(dev, "failed to init regmap: %ld\n",
|
|
PTR_ERR(formatter->map));
|
|
return PTR_ERR(formatter->map);
|
|
}
|
|
|
|
/* Peripharal clock */
|
|
formatter->pclk = devm_clk_get(dev, "pclk");
|
|
if (IS_ERR(formatter->pclk))
|
|
return dev_err_probe(dev, PTR_ERR(formatter->pclk), "failed to get pclk\n");
|
|
|
|
/* Formatter bit clock */
|
|
formatter->sclk = devm_clk_get(dev, "sclk");
|
|
if (IS_ERR(formatter->sclk))
|
|
return dev_err_probe(dev, PTR_ERR(formatter->sclk), "failed to get sclk\n");
|
|
|
|
/* Formatter sample clock */
|
|
formatter->lrclk = devm_clk_get(dev, "lrclk");
|
|
if (IS_ERR(formatter->lrclk))
|
|
return dev_err_probe(dev, PTR_ERR(formatter->lrclk), "failed to get lrclk\n");
|
|
|
|
/* Formatter bit clock input multiplexer */
|
|
formatter->sclk_sel = devm_clk_get(dev, "sclk_sel");
|
|
if (IS_ERR(formatter->sclk_sel))
|
|
return dev_err_probe(dev, PTR_ERR(formatter->sclk_sel), "failed to get sclk_sel\n");
|
|
|
|
/* Formatter sample clock input multiplexer */
|
|
formatter->lrclk_sel = devm_clk_get(dev, "lrclk_sel");
|
|
if (IS_ERR(formatter->lrclk_sel))
|
|
return dev_err_probe(dev, PTR_ERR(formatter->lrclk_sel),
|
|
"failed to get lrclk_sel\n");
|
|
|
|
/* Formatter dedicated reset line */
|
|
formatter->reset = devm_reset_control_get_optional_exclusive(dev, NULL);
|
|
if (IS_ERR(formatter->reset))
|
|
return dev_err_probe(dev, PTR_ERR(formatter->reset), "failed to get reset\n");
|
|
|
|
return devm_snd_soc_register_component(dev, drv->component_drv,
|
|
NULL, 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(axg_tdm_formatter_probe);
|
|
|
|
int axg_tdm_stream_start(struct axg_tdm_stream *ts)
|
|
{
|
|
struct axg_tdm_formatter *formatter;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&ts->lock);
|
|
ts->ready = true;
|
|
|
|
/* Start all the formatters attached to the stream */
|
|
list_for_each_entry(formatter, &ts->formatter_list, list) {
|
|
ret = axg_tdm_formatter_enable(formatter);
|
|
if (ret) {
|
|
pr_err("failed to start tdm stream\n");
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&ts->lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(axg_tdm_stream_start);
|
|
|
|
void axg_tdm_stream_stop(struct axg_tdm_stream *ts)
|
|
{
|
|
struct axg_tdm_formatter *formatter;
|
|
|
|
mutex_lock(&ts->lock);
|
|
ts->ready = false;
|
|
|
|
/* Stop all the formatters attached to the stream */
|
|
list_for_each_entry(formatter, &ts->formatter_list, list) {
|
|
axg_tdm_formatter_disable(formatter);
|
|
}
|
|
|
|
mutex_unlock(&ts->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(axg_tdm_stream_stop);
|
|
|
|
struct axg_tdm_stream *axg_tdm_stream_alloc(struct axg_tdm_iface *iface)
|
|
{
|
|
struct axg_tdm_stream *ts;
|
|
|
|
ts = kzalloc(sizeof(*ts), GFP_KERNEL);
|
|
if (ts) {
|
|
INIT_LIST_HEAD(&ts->formatter_list);
|
|
mutex_init(&ts->lock);
|
|
ts->iface = iface;
|
|
}
|
|
|
|
return ts;
|
|
}
|
|
EXPORT_SYMBOL_GPL(axg_tdm_stream_alloc);
|
|
|
|
void axg_tdm_stream_free(struct axg_tdm_stream *ts)
|
|
{
|
|
/*
|
|
* If the list is not empty, it would mean that one of the formatter
|
|
* widget is still powered and attached to the interface while we
|
|
* are removing the TDM DAI. It should not be possible
|
|
*/
|
|
WARN_ON(!list_empty(&ts->formatter_list));
|
|
mutex_destroy(&ts->lock);
|
|
kfree(ts);
|
|
}
|
|
EXPORT_SYMBOL_GPL(axg_tdm_stream_free);
|
|
|
|
MODULE_DESCRIPTION("Amlogic AXG TDM formatter driver");
|
|
MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
|
|
MODULE_LICENSE("GPL v2");
|