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Subject[PATCH v1 06/12] ASoC: rockchip: pdm: fixup pdm fractional div
Date
This patch adds support fractional div for rk3308.

Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
---

sound/soc/rockchip/rockchip_pdm.c | 172 ++++++++++++++++++++++++++++----------
sound/soc/rockchip/rockchip_pdm.h | 9 ++
2 files changed, 139 insertions(+), 42 deletions(-)

diff --git a/sound/soc/rockchip/rockchip_pdm.c b/sound/soc/rockchip/rockchip_pdm.c
index c50494b..4f93a74 100644
--- a/sound/soc/rockchip/rockchip_pdm.c
+++ b/sound/soc/rockchip/rockchip_pdm.c
@@ -17,14 +17,23 @@
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/pm_runtime.h>
+#include <linux/rational.h>
#include <linux/regmap.h>
+#include <linux/reset.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm_params.h>

#include "rockchip_pdm.h"

#define PDM_DMA_BURST_SIZE (8) /* size * width: 8*4 = 32 bytes */
+#define PDM_SIGNOFF_CLK_RATE (100000000)
+
+enum rk_pdm_version {
+ RK_PDM_RK3229,
+ RK_PDM_RK3308,
+};

struct rk_pdm_dev {
struct device *dev;
@@ -32,22 +41,51 @@ struct rk_pdm_dev {
struct clk *hclk;
struct regmap *regmap;
struct snd_dmaengine_dai_dma_data capture_dma_data;
+ struct reset_control *reset;
+ enum rk_pdm_version version;
};

struct rk_pdm_clkref {
unsigned int sr;
unsigned int clk;
+ unsigned int clk_out;
+};
+
+struct rk_pdm_ds_ratio {
+ unsigned int ratio;
+ unsigned int sr;
};

static struct rk_pdm_clkref clkref[] = {
- { 8000, 40960000 },
- { 11025, 56448000 },
- { 12000, 61440000 },
+ { 8000, 40960000, 2048000 },
+ { 11025, 56448000, 2822400 },
+ { 12000, 61440000, 3072000 },
+ { 8000, 98304000, 2048000 },
+ { 12000, 98304000, 3072000 },
+};
+
+static struct rk_pdm_ds_ratio ds_ratio[] = {
+ { 0, 192000 },
+ { 0, 176400 },
+ { 0, 128000 },
+ { 1, 96000 },
+ { 1, 88200 },
+ { 1, 64000 },
+ { 2, 48000 },
+ { 2, 44100 },
+ { 2, 32000 },
+ { 3, 24000 },
+ { 3, 22050 },
+ { 3, 16000 },
+ { 4, 12000 },
+ { 4, 11025 },
+ { 4, 8000 },
};

-static unsigned int get_pdm_clk(unsigned int sr)
+static unsigned int get_pdm_clk(struct rk_pdm_dev *pdm, unsigned int sr,
+ unsigned int *clk_src, unsigned int *clk_out)
{
- unsigned int i, count, clk, div;
+ unsigned int i, count, clk, div, rate;

clk = 0;
if (!sr)
@@ -59,14 +97,39 @@ static unsigned int get_pdm_clk(unsigned int sr)
continue;
div = sr / clkref[i].sr;
if ((div & (div - 1)) == 0) {
+ *clk_out = clkref[i].clk_out;
+ rate = clk_round_rate(pdm->clk, clkref[i].clk);
+ if (rate != clkref[i].clk)
+ continue;
clk = clkref[i].clk;
+ *clk_src = clkref[i].clk;
break;
}
}

+ if (!clk) {
+ clk = clk_round_rate(pdm->clk, PDM_SIGNOFF_CLK_RATE);
+ *clk_src = clk;
+ }
return clk;
}

+static unsigned int get_pdm_ds_ratio(unsigned int sr)
+{
+ unsigned int i, count, ratio;
+
+ ratio = 0;
+ if (!sr)
+ return ratio;
+
+ count = ARRAY_SIZE(ds_ratio);
+ for (i = 0; i < count; i++) {
+ if (sr == ds_ratio[i].sr)
+ ratio = ds_ratio[i].ratio;
+ }
+ return ratio;
+}
+
static inline struct rk_pdm_dev *to_info(struct snd_soc_dai *dai)
{
return snd_soc_dai_get_drvdata(dai);
@@ -95,40 +158,52 @@ static int rockchip_pdm_hw_params(struct snd_pcm_substream *substream,
struct rk_pdm_dev *pdm = to_info(dai);
unsigned int val = 0;
unsigned int clk_rate, clk_div, samplerate;
+ unsigned int clk_src, clk_out;
+ unsigned long m, n;
+ bool change;
int ret;

+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ return 0;
+
samplerate = params_rate(params);
- clk_rate = get_pdm_clk(samplerate);
+ clk_rate = get_pdm_clk(pdm, samplerate, &clk_src, &clk_out);
if (!clk_rate)
return -EINVAL;

- ret = clk_set_rate(pdm->clk, clk_rate);
+ ret = clk_set_rate(pdm->clk, clk_src);
if (ret)
return -EINVAL;

- clk_div = DIV_ROUND_CLOSEST(clk_rate, samplerate);
-
- switch (clk_div) {
- case 320:
- val = PDM_CLK_320FS;
- break;
- case 640:
- val = PDM_CLK_640FS;
- break;
- case 1280:
- val = PDM_CLK_1280FS;
- break;
- case 2560:
- val = PDM_CLK_2560FS;
- break;
- case 5120:
- val = PDM_CLK_5120FS;
- break;
- default:
- dev_err(pdm->dev, "unsupported div: %d\n", clk_div);
- return -EINVAL;
+ if (pdm->version == RK_PDM_RK3308) {
+ rational_best_approximation(clk_out, clk_src,
+ GENMASK(16 - 1, 0),
+ GENMASK(16 - 1, 0),
+ &m, &n);
+
+ val = (m << PDM_FD_NUMERATOR_SFT) |
+ (n << PDM_FD_DENOMINATOR_SFT);
+ regmap_update_bits_check(pdm->regmap, PDM_CTRL1,
+ PDM_FD_NUMERATOR_MSK |
+ PDM_FD_DENOMINATOR_MSK,
+ val, &change);
+ if (change) {
+ reset_control_assert(pdm->reset);
+ reset_control_deassert(pdm->reset);
+ rockchip_pdm_rxctrl(pdm, 0);
+ }
+ clk_div = n / m;
+ if (clk_div >= 40)
+ val = PDM_CLK_FD_RATIO_40;
+ else if (clk_div <= 35)
+ val = PDM_CLK_FD_RATIO_35;
+ else
+ return -EINVAL;
+ regmap_update_bits(pdm->regmap, PDM_CLK_CTRL,
+ PDM_CLK_FD_RATIO_MSK,
+ val);
}
-
+ val = get_pdm_ds_ratio(samplerate);
regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_DS_RATIO_MSK, val);
regmap_update_bits(pdm->regmap, PDM_HPF_CTRL,
PDM_HPF_CF_MSK, PDM_HPF_60HZ);
@@ -177,13 +252,11 @@ static int rockchip_pdm_hw_params(struct snd_pcm_substream *substream,
return -EINVAL;
}

- if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
- regmap_update_bits(pdm->regmap, PDM_CTRL0,
- PDM_PATH_MSK | PDM_VDW_MSK,
- val);
- regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, PDM_DMA_RDL_MSK,
- PDM_DMA_RDL(16));
- }
+ regmap_update_bits(pdm->regmap, PDM_CTRL0,
+ PDM_PATH_MSK | PDM_VDW_MSK,
+ val);
+ regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, PDM_DMA_RDL_MSK,
+ PDM_DMA_RDL(16));

return 0;
}
@@ -380,8 +453,19 @@ static const struct regmap_config rockchip_pdm_regmap_config = {
.cache_type = REGCACHE_FLAT,
};

+static const struct of_device_id rockchip_pdm_match[] = {
+ { .compatible = "rockchip,pdm", },
+ { .compatible = "rockchip,px30-pdm",
+ .data = (void *)RK_PDM_RK3308 },
+ { .compatible = "rockchip,rk3308-pdm",
+ .data = (void *)RK_PDM_RK3308 },
+ {},
+};
+MODULE_DEVICE_TABLE(of, rockchip_pdm_match);
+
static int rockchip_pdm_probe(struct platform_device *pdev)
{
+ const struct of_device_id *match;
struct rk_pdm_dev *pdm;
struct resource *res;
void __iomem *regs;
@@ -391,6 +475,16 @@ static int rockchip_pdm_probe(struct platform_device *pdev)
if (!pdm)
return -ENOMEM;

+ match = of_match_device(rockchip_pdm_match, &pdev->dev);
+ if (match)
+ pdm->version = (enum rk_pdm_version)match->data;
+
+ if (pdm->version == RK_PDM_RK3308) {
+ pdm->reset = devm_reset_control_get(&pdev->dev, "pdm-m");
+ if (IS_ERR(pdm->reset))
+ return PTR_ERR(pdm->reset);
+ }
+
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(regs))
@@ -503,12 +597,6 @@ static const struct dev_pm_ops rockchip_pdm_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(rockchip_pdm_suspend, rockchip_pdm_resume)
};

-static const struct of_device_id rockchip_pdm_match[] = {
- { .compatible = "rockchip,pdm", },
- {},
-};
-MODULE_DEVICE_TABLE(of, rockchip_pdm_match);
-
static struct platform_driver rockchip_pdm_driver = {
.probe = rockchip_pdm_probe,
.remove = rockchip_pdm_remove,
diff --git a/sound/soc/rockchip/rockchip_pdm.h b/sound/soc/rockchip/rockchip_pdm.h
index 00a8fa1..ae88644 100644
--- a/sound/soc/rockchip/rockchip_pdm.h
+++ b/sound/soc/rockchip/rockchip_pdm.h
@@ -53,7 +53,16 @@
#define PDM_VDW_MSK (0x1f << 0)
#define PDM_VDW(X) ((X - 1) << 0)

+/* PDM CTRL1 */
+#define PDM_FD_NUMERATOR_SFT 16
+#define PDM_FD_NUMERATOR_MSK GENMASK(31, 16)
+#define PDM_FD_DENOMINATOR_SFT 0
+#define PDM_FD_DENOMINATOR_MSK GENMASK(15, 0)
+
/* PDM CLK CTRL */
+#define PDM_CLK_FD_RATIO_MSK BIT(6)
+#define PDM_CLK_FD_RATIO_40 (0X0 << 6)
+#define PDM_CLK_FD_RATIO_35 BIT(6)
#define PDM_CLK_MSK BIT(5)
#define PDM_CLK_EN BIT(5)
#define PDM_CLK_DIS (0x0 << 5)
--
2.7.4


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