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