forked from Minki/linux
ASoC: rockchip: pdm: fixup pdm fractional div
This patch adds support fractional div for rk3308. Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com> Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sugar Zhang
Mark Brown
parent
072cb68a43
commit
624e8e00ac
@ -17,14 +17,23 @@
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#include <linux/module.h>
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#include <linux/clk.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/rational.h>
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#include <linux/regmap.h>
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#include <linux/reset.h>
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#include <sound/dmaengine_pcm.h>
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#include <sound/pcm_params.h>
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#include "rockchip_pdm.h"
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#define PDM_DMA_BURST_SIZE (8) /* size * width: 8*4 = 32 bytes */
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#define PDM_SIGNOFF_CLK_RATE (100000000)
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enum rk_pdm_version {
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RK_PDM_RK3229,
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RK_PDM_RK3308,
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};
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struct rk_pdm_dev {
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struct device *dev;
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@ -32,22 +41,51 @@ struct rk_pdm_dev {
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struct clk *hclk;
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struct regmap *regmap;
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struct snd_dmaengine_dai_dma_data capture_dma_data;
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struct reset_control *reset;
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enum rk_pdm_version version;
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};
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struct rk_pdm_clkref {
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unsigned int sr;
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unsigned int clk;
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unsigned int clk_out;
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};
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struct rk_pdm_ds_ratio {
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unsigned int ratio;
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unsigned int sr;
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};
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static struct rk_pdm_clkref clkref[] = {
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{ 8000, 40960000 },
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{ 11025, 56448000 },
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{ 12000, 61440000 },
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{ 8000, 40960000, 2048000 },
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{ 11025, 56448000, 2822400 },
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{ 12000, 61440000, 3072000 },
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{ 8000, 98304000, 2048000 },
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{ 12000, 98304000, 3072000 },
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};
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static unsigned int get_pdm_clk(unsigned int sr)
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static struct rk_pdm_ds_ratio ds_ratio[] = {
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{ 0, 192000 },
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{ 0, 176400 },
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{ 0, 128000 },
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{ 1, 96000 },
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{ 1, 88200 },
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{ 1, 64000 },
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{ 2, 48000 },
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{ 2, 44100 },
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{ 2, 32000 },
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{ 3, 24000 },
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{ 3, 22050 },
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{ 3, 16000 },
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{ 4, 12000 },
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{ 4, 11025 },
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{ 4, 8000 },
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};
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static unsigned int get_pdm_clk(struct rk_pdm_dev *pdm, unsigned int sr,
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unsigned int *clk_src, unsigned int *clk_out)
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{
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unsigned int i, count, clk, div;
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unsigned int i, count, clk, div, rate;
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clk = 0;
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if (!sr)
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@ -59,14 +97,39 @@ static unsigned int get_pdm_clk(unsigned int sr)
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continue;
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div = sr / clkref[i].sr;
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if ((div & (div - 1)) == 0) {
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*clk_out = clkref[i].clk_out;
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rate = clk_round_rate(pdm->clk, clkref[i].clk);
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if (rate != clkref[i].clk)
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continue;
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clk = clkref[i].clk;
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*clk_src = clkref[i].clk;
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break;
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}
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}
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if (!clk) {
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clk = clk_round_rate(pdm->clk, PDM_SIGNOFF_CLK_RATE);
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*clk_src = clk;
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}
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return clk;
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}
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static unsigned int get_pdm_ds_ratio(unsigned int sr)
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{
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unsigned int i, count, ratio;
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ratio = 0;
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if (!sr)
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return ratio;
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count = ARRAY_SIZE(ds_ratio);
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for (i = 0; i < count; i++) {
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if (sr == ds_ratio[i].sr)
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ratio = ds_ratio[i].ratio;
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}
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return ratio;
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}
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static inline struct rk_pdm_dev *to_info(struct snd_soc_dai *dai)
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{
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return snd_soc_dai_get_drvdata(dai);
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@ -95,40 +158,52 @@ static int rockchip_pdm_hw_params(struct snd_pcm_substream *substream,
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struct rk_pdm_dev *pdm = to_info(dai);
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unsigned int val = 0;
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unsigned int clk_rate, clk_div, samplerate;
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unsigned int clk_src, clk_out;
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unsigned long m, n;
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bool change;
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int ret;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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return 0;
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samplerate = params_rate(params);
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clk_rate = get_pdm_clk(samplerate);
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clk_rate = get_pdm_clk(pdm, samplerate, &clk_src, &clk_out);
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if (!clk_rate)
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return -EINVAL;
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ret = clk_set_rate(pdm->clk, clk_rate);
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ret = clk_set_rate(pdm->clk, clk_src);
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if (ret)
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return -EINVAL;
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clk_div = DIV_ROUND_CLOSEST(clk_rate, samplerate);
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if (pdm->version == RK_PDM_RK3308) {
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rational_best_approximation(clk_out, clk_src,
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GENMASK(16 - 1, 0),
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GENMASK(16 - 1, 0),
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&m, &n);
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switch (clk_div) {
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case 320:
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val = PDM_CLK_320FS;
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break;
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case 640:
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val = PDM_CLK_640FS;
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break;
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case 1280:
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val = PDM_CLK_1280FS;
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break;
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case 2560:
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val = PDM_CLK_2560FS;
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break;
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case 5120:
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val = PDM_CLK_5120FS;
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break;
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default:
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dev_err(pdm->dev, "unsupported div: %d\n", clk_div);
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return -EINVAL;
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val = (m << PDM_FD_NUMERATOR_SFT) |
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(n << PDM_FD_DENOMINATOR_SFT);
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regmap_update_bits_check(pdm->regmap, PDM_CTRL1,
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PDM_FD_NUMERATOR_MSK |
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PDM_FD_DENOMINATOR_MSK,
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val, &change);
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if (change) {
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reset_control_assert(pdm->reset);
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reset_control_deassert(pdm->reset);
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rockchip_pdm_rxctrl(pdm, 0);
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}
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clk_div = n / m;
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if (clk_div >= 40)
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val = PDM_CLK_FD_RATIO_40;
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else if (clk_div <= 35)
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val = PDM_CLK_FD_RATIO_35;
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else
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return -EINVAL;
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regmap_update_bits(pdm->regmap, PDM_CLK_CTRL,
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PDM_CLK_FD_RATIO_MSK,
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val);
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}
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val = get_pdm_ds_ratio(samplerate);
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regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_DS_RATIO_MSK, val);
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regmap_update_bits(pdm->regmap, PDM_HPF_CTRL,
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PDM_HPF_CF_MSK, PDM_HPF_60HZ);
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@ -177,13 +252,11 @@ static int rockchip_pdm_hw_params(struct snd_pcm_substream *substream,
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return -EINVAL;
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}
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if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
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regmap_update_bits(pdm->regmap, PDM_CTRL0,
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PDM_PATH_MSK | PDM_VDW_MSK,
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val);
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regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, PDM_DMA_RDL_MSK,
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PDM_DMA_RDL(16));
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}
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regmap_update_bits(pdm->regmap, PDM_CTRL0,
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PDM_PATH_MSK | PDM_VDW_MSK,
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val);
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regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, PDM_DMA_RDL_MSK,
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PDM_DMA_RDL(16));
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return 0;
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}
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@ -380,8 +453,19 @@ static const struct regmap_config rockchip_pdm_regmap_config = {
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.cache_type = REGCACHE_FLAT,
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};
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static const struct of_device_id rockchip_pdm_match[] = {
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{ .compatible = "rockchip,pdm", },
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{ .compatible = "rockchip,px30-pdm",
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.data = (void *)RK_PDM_RK3308 },
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{ .compatible = "rockchip,rk3308-pdm",
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.data = (void *)RK_PDM_RK3308 },
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{},
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};
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MODULE_DEVICE_TABLE(of, rockchip_pdm_match);
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static int rockchip_pdm_probe(struct platform_device *pdev)
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{
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const struct of_device_id *match;
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struct rk_pdm_dev *pdm;
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struct resource *res;
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void __iomem *regs;
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@ -391,6 +475,16 @@ static int rockchip_pdm_probe(struct platform_device *pdev)
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if (!pdm)
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return -ENOMEM;
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match = of_match_device(rockchip_pdm_match, &pdev->dev);
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if (match)
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pdm->version = (enum rk_pdm_version)match->data;
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if (pdm->version == RK_PDM_RK3308) {
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pdm->reset = devm_reset_control_get(&pdev->dev, "pdm-m");
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if (IS_ERR(pdm->reset))
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return PTR_ERR(pdm->reset);
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(regs))
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@ -503,12 +597,6 @@ static const struct dev_pm_ops rockchip_pdm_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(rockchip_pdm_suspend, rockchip_pdm_resume)
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};
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static const struct of_device_id rockchip_pdm_match[] = {
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{ .compatible = "rockchip,pdm", },
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{},
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};
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MODULE_DEVICE_TABLE(of, rockchip_pdm_match);
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static struct platform_driver rockchip_pdm_driver = {
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.probe = rockchip_pdm_probe,
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.remove = rockchip_pdm_remove,
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@ -53,7 +53,16 @@
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#define PDM_VDW_MSK (0x1f << 0)
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#define PDM_VDW(X) ((X - 1) << 0)
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/* PDM CTRL1 */
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#define PDM_FD_NUMERATOR_SFT 16
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#define PDM_FD_NUMERATOR_MSK GENMASK(31, 16)
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#define PDM_FD_DENOMINATOR_SFT 0
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#define PDM_FD_DENOMINATOR_MSK GENMASK(15, 0)
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/* PDM CLK CTRL */
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#define PDM_CLK_FD_RATIO_MSK BIT(6)
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#define PDM_CLK_FD_RATIO_40 (0X0 << 6)
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#define PDM_CLK_FD_RATIO_35 BIT(6)
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#define PDM_CLK_MSK BIT(5)
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#define PDM_CLK_EN BIT(5)
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#define PDM_CLK_DIS (0x0 << 5)
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