From 77dce745cd500cbe65e4cbb613c27c23e26f5bbb Mon Sep 17 00:00:00 2001 From: BabuSubashChandar Date: Tue, 28 Mar 2017 20:04:42 +0530 Subject: [PATCH] Add support for Allo Boss DAC add-on board for Raspberry Pi. (#1924) Signed-off-by: Baswaraj K Reviewed-by: Deepak Reviewed-by: BabuSubashChandar Add support for new clock rate and mute gpios. Signed-off-by: Baswaraj K Reviewed-by: Deepak Reviewed-by: BabuSubashChandar ASoC: allo-boss-dac: fix S24_LE format Remove set_bclk_ratio call so 24-bit data is transmitted in 24 bclk cycles. Signed-off-by: Matthias Reichl ASoC: allo-boss-dac: transmit S24_LE with 64 BCLK cycles Signed-off-by: Matthias Reichl --- drivers/clk/Makefile | 1 + drivers/clk/clk-allo-dac.c | 161 ++++++++++++ sound/soc/bcm/allo-boss-dac.c | 456 ++++++++++++++++++++++++++++++++++ 3 files changed, 618 insertions(+) create mode 100644 drivers/clk/clk-allo-dac.c create mode 100644 sound/soc/bcm/allo-boss-dac.c --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -18,6 +18,7 @@ endif # hardware specific clock types # please keep this section sorted lexicographically by file path name +obj-$(CONFIG_SND_BCM2708_SOC_ALLO_BOSS_DAC) += clk-allo-dac.o obj-$(CONFIG_MACH_ASM9260) += clk-asm9260.o obj-$(CONFIG_COMMON_CLK_AXI_CLKGEN) += clk-axi-clkgen.o obj-$(CONFIG_ARCH_AXXIA) += clk-axm5516.o --- /dev/null +++ b/drivers/clk/clk-allo-dac.c @@ -0,0 +1,161 @@ +/* + * Clock Driver for Allo DAC + * + * Author: Baswaraj K + * Copyright 2016 + * based on code by Stuart MacLean + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include + +/* Clock rate of CLK44EN attached to GPIO6 pin */ +#define CLK_44EN_RATE 45158400UL +/* Clock rate of CLK48EN attached to GPIO3 pin */ +#define CLK_48EN_RATE 49152000UL + +/** + * struct allo_dac_clk - Common struct to the Allo DAC + * @hw: clk_hw for the common clk framework + * @mode: 0 => CLK44EN, 1 => CLK48EN + */ +struct clk_allo_hw { + struct clk_hw hw; + uint8_t mode; +}; + +#define to_allo_clk(_hw) container_of(_hw, struct clk_allo_hw, hw) + +static const struct of_device_id clk_allo_dac_dt_ids[] = { + { .compatible = "allo,dac-clk",}, + { } +}; +MODULE_DEVICE_TABLE(of, clk_allo_dac_dt_ids); + +static unsigned long clk_allo_dac_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + return (to_allo_clk(hw)->mode == 0) ? CLK_44EN_RATE : + CLK_48EN_RATE; +} + +static long clk_allo_dac_round_rate(struct clk_hw *hw, + unsigned long rate, unsigned long *parent_rate) +{ + long actual_rate; + + if (rate <= CLK_44EN_RATE) { + actual_rate = (long)CLK_44EN_RATE; + } else if (rate >= CLK_48EN_RATE) { + actual_rate = (long)CLK_48EN_RATE; + } else { + long diff44Rate = (long)(rate - CLK_44EN_RATE); + long diff48Rate = (long)(CLK_48EN_RATE - rate); + + if (diff44Rate < diff48Rate) + actual_rate = (long)CLK_44EN_RATE; + else + actual_rate = (long)CLK_48EN_RATE; + } + return actual_rate; +} + + +static int clk_allo_dac_set_rate(struct clk_hw *hw, + unsigned long rate, unsigned long parent_rate) +{ + unsigned long actual_rate; + struct clk_allo_hw *clk = to_allo_clk(hw); + + actual_rate = (unsigned long)clk_allo_dac_round_rate(hw, rate, + &parent_rate); + clk->mode = (actual_rate == CLK_44EN_RATE) ? 0 : 1; + return 0; +} + + +const struct clk_ops clk_allo_dac_rate_ops = { + .recalc_rate = clk_allo_dac_recalc_rate, + .round_rate = clk_allo_dac_round_rate, + .set_rate = clk_allo_dac_set_rate, +}; + +static int clk_allo_dac_probe(struct platform_device *pdev) +{ + int ret; + struct clk_allo_hw *proclk; + struct clk *clk; + struct device *dev; + struct clk_init_data init; + + dev = &pdev->dev; + + proclk = kzalloc(sizeof(struct clk_allo_hw), GFP_KERNEL); + if (!proclk) + return -ENOMEM; + + init.name = "clk-allo-dac"; + init.ops = &clk_allo_dac_rate_ops; + init.flags = CLK_IS_BASIC; + init.parent_names = NULL; + init.num_parents = 0; + + proclk->mode = 0; + proclk->hw.init = &init; + + clk = devm_clk_register(dev, &proclk->hw); + if (!IS_ERR(clk)) { + ret = of_clk_add_provider(dev->of_node, of_clk_src_simple_get, + clk); + } else { + dev_err(dev, "Fail to register clock driver\n"); + kfree(proclk); + ret = PTR_ERR(clk); + } + return ret; +} + +static int clk_allo_dac_remove(struct platform_device *pdev) +{ + of_clk_del_provider(pdev->dev.of_node); + return 0; +} + +static struct platform_driver clk_allo_dac_driver = { + .probe = clk_allo_dac_probe, + .remove = clk_allo_dac_remove, + .driver = { + .name = "clk-allo-dac", + .of_match_table = clk_allo_dac_dt_ids, + }, +}; + +static int __init clk_allo_dac_init(void) +{ + return platform_driver_register(&clk_allo_dac_driver); +} +core_initcall(clk_allo_dac_init); + +static void __exit clk_allo_dac_exit(void) +{ + platform_driver_unregister(&clk_allo_dac_driver); +} +module_exit(clk_allo_dac_exit); + +MODULE_DESCRIPTION("Allo DAC clock driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:clk-allo-dac"); --- /dev/null +++ b/sound/soc/bcm/allo-boss-dac.c @@ -0,0 +1,456 @@ +/* + * ALSA ASoC Machine Driver for Allo Boss DAC + * + * Author: Baswaraj K + * Copyright 2017 + * based on code by Daniel Matuschek, + * Stuart MacLean + * based on code by Florian Meier + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + */ + +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include "../codecs/pcm512x.h" + +#define ALLO_BOSS_NOCLOCK 0 +#define ALLO_BOSS_CLK44EN 1 +#define ALLO_BOSS_CLK48EN 2 + +struct pcm512x_priv { + struct regmap *regmap; + struct clk *sclk; +}; + +static struct gpio_desc *mute_gpio; + +/* Clock rate of CLK44EN attached to GPIO6 pin */ +#define CLK_44EN_RATE 45158400UL +/* Clock rate of CLK48EN attached to GPIO3 pin */ +#define CLK_48EN_RATE 49152000UL + +static bool slave; +static bool snd_soc_allo_boss_master; +static bool digital_gain_0db_limit = true; + +static void snd_allo_boss_select_clk(struct snd_soc_component *component, + int clk_id) +{ + switch (clk_id) { + case ALLO_BOSS_NOCLOCK: + snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x24, 0x00); + break; + case ALLO_BOSS_CLK44EN: + snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x24, 0x20); + break; + case ALLO_BOSS_CLK48EN: + snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x24, 0x04); + break; + } +} + +static void snd_allo_boss_clk_gpio(struct snd_soc_component *component) +{ + snd_soc_component_update_bits(component, PCM512x_GPIO_EN, 0x24, 0x24); + snd_soc_component_update_bits(component, PCM512x_GPIO_OUTPUT_3, 0x0f, 0x02); + snd_soc_component_update_bits(component, PCM512x_GPIO_OUTPUT_6, 0x0f, 0x02); +} + +static bool snd_allo_boss_is_sclk(struct snd_soc_component *component) +{ + unsigned int sck; + + snd_soc_component_read(component, PCM512x_RATE_DET_4, &sck); + return (!(sck & 0x40)); +} + +static bool snd_allo_boss_is_sclk_sleep( + struct snd_soc_component *component) +{ + msleep(2); + return snd_allo_boss_is_sclk(component); +} + +static bool snd_allo_boss_is_master_card(struct snd_soc_component *component) +{ + bool isClk44EN, isClk48En, isNoClk; + + snd_allo_boss_clk_gpio(component); + + snd_allo_boss_select_clk(component, ALLO_BOSS_CLK44EN); + isClk44EN = snd_allo_boss_is_sclk_sleep(component); + + snd_allo_boss_select_clk(component, ALLO_BOSS_NOCLOCK); + isNoClk = snd_allo_boss_is_sclk_sleep(component); + + snd_allo_boss_select_clk(component, ALLO_BOSS_CLK48EN); + isClk48En = snd_allo_boss_is_sclk_sleep(component); + + return (isClk44EN && isClk48En && !isNoClk); +} + +static int snd_allo_boss_clk_for_rate(int sample_rate) +{ + int type; + + switch (sample_rate) { + case 11025: + case 22050: + case 44100: + case 88200: + case 176400: + case 352800: + type = ALLO_BOSS_CLK44EN; + break; + default: + type = ALLO_BOSS_CLK48EN; + break; + } + return type; +} + +static void snd_allo_boss_set_sclk(struct snd_soc_component *component, + int sample_rate) +{ + struct pcm512x_priv *pcm512x = snd_soc_component_get_drvdata(component); + + if (!IS_ERR(pcm512x->sclk)) { + int ctype; + + ctype = snd_allo_boss_clk_for_rate(sample_rate); + clk_set_rate(pcm512x->sclk, (ctype == ALLO_BOSS_CLK44EN) + ? CLK_44EN_RATE : CLK_48EN_RATE); + snd_allo_boss_select_clk(component, ctype); + } +} + +static int snd_allo_boss_init(struct snd_soc_pcm_runtime *rtd) +{ + struct snd_soc_component *component = rtd->codec_dai->component; + struct pcm512x_priv *priv = snd_soc_component_get_drvdata(component); + + if (slave) + snd_soc_allo_boss_master = false; + else + snd_soc_allo_boss_master = + snd_allo_boss_is_master_card(component); + + if (snd_soc_allo_boss_master) { + struct snd_soc_dai_link *dai = rtd->dai_link; + + dai->name = "BossDAC"; + dai->stream_name = "Boss DAC HiFi [Master]"; + dai->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF + | SND_SOC_DAIFMT_CBM_CFM; + + snd_soc_component_update_bits(component, PCM512x_BCLK_LRCLK_CFG, 0x31, 0x11); + snd_soc_component_update_bits(component, PCM512x_MASTER_MODE, 0x03, 0x03); + snd_soc_component_update_bits(component, PCM512x_MASTER_CLKDIV_2, 0x7f, 63); + /* + * Default sclk to CLK_48EN_RATE, otherwise codec + * pcm512x_dai_startup_master method could call + * snd_pcm_hw_constraint_ratnums using CLK_44EN/64 + * which will mask 384k sample rate. + */ + if (!IS_ERR(priv->sclk)) + clk_set_rate(priv->sclk, CLK_48EN_RATE); + } else { + priv->sclk = ERR_PTR(-ENOENT); + } + + snd_soc_component_update_bits(component, PCM512x_GPIO_EN, 0x08, 0x08); + snd_soc_component_update_bits(component, PCM512x_GPIO_OUTPUT_4, 0x0f, 0x02); + snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08, 0x08); + + if (digital_gain_0db_limit) { + int ret; + struct snd_soc_card *card = rtd->card; + + ret = snd_soc_limit_volume(card, "Digital Playback Volume", + 207); + if (ret < 0) + dev_warn(card->dev, "Failed to set volume limit: %d\n", + ret); + } + + return 0; +} + +static int snd_allo_boss_update_rate_den( + struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_component *component = rtd->codec_dai->component; + struct pcm512x_priv *pcm512x = snd_soc_component_get_drvdata(component); + struct snd_ratnum *rats_no_pll; + unsigned int num = 0, den = 0; + int err; + + rats_no_pll = devm_kzalloc(rtd->dev, sizeof(*rats_no_pll), GFP_KERNEL); + if (!rats_no_pll) + return -ENOMEM; + + rats_no_pll->num = clk_get_rate(pcm512x->sclk) / 64; + rats_no_pll->den_min = 1; + rats_no_pll->den_max = 128; + rats_no_pll->den_step = 1; + + err = snd_interval_ratnum(hw_param_interval(params, + SNDRV_PCM_HW_PARAM_RATE), 1, rats_no_pll, &num, &den); + if (err >= 0 && den) { + params->rate_num = num; + params->rate_den = den; + } + + devm_kfree(rtd->dev, rats_no_pll); + return 0; +} + +static void snd_allo_boss_gpio_mute(struct snd_soc_card *card) +{ + if (mute_gpio) + gpiod_set_value_cansleep(mute_gpio, 1); +} + +static void snd_allo_boss_gpio_unmute(struct snd_soc_card *card) +{ + if (mute_gpio) + gpiod_set_value_cansleep(mute_gpio, 0); +} + +static int snd_allo_boss_set_bias_level(struct snd_soc_card *card, + struct snd_soc_dapm_context *dapm, enum snd_soc_bias_level level) +{ + struct snd_soc_pcm_runtime *rtd; + struct snd_soc_dai *codec_dai; + + rtd = snd_soc_get_pcm_runtime(card, card->dai_link[0].name); + codec_dai = rtd->codec_dai; + + if (dapm->dev != codec_dai->dev) + return 0; + + switch (level) { + case SND_SOC_BIAS_PREPARE: + if (dapm->bias_level != SND_SOC_BIAS_STANDBY) + break; + /* UNMUTE DAC */ + snd_allo_boss_gpio_unmute(card); + break; + + case SND_SOC_BIAS_STANDBY: + if (dapm->bias_level != SND_SOC_BIAS_PREPARE) + break; + /* MUTE DAC */ + snd_allo_boss_gpio_mute(card); + break; + + default: + break; + } + + return 0; +} + +static int snd_allo_boss_hw_params( + struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) +{ + int ret = 0; + struct snd_soc_pcm_runtime *rtd = substream->private_data; + int channels = params_channels(params); + int width = snd_pcm_format_physical_width(params_format(params)); + + if (snd_soc_allo_boss_master) { + struct snd_soc_component *component = rtd->codec_dai->component; + + snd_allo_boss_set_sclk(component, + params_rate(params)); + + ret = snd_allo_boss_update_rate_den( + substream, params); + if (ret) + return ret; + } + + ret = snd_soc_dai_set_tdm_slot(rtd->cpu_dai, 0x03, 0x03, + channels, width); + if (ret) + return ret; + ret = snd_soc_dai_set_tdm_slot(rtd->codec_dai, 0x03, 0x03, + channels, width); + return ret; +} + +static int snd_allo_boss_startup( + struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_component *component = rtd->codec_dai->component; + struct snd_soc_card *card = rtd->card; + + snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08, 0x08); + snd_allo_boss_gpio_mute(card); + + if (snd_soc_allo_boss_master) { + struct pcm512x_priv *priv = snd_soc_component_get_drvdata(component); + /* + * Default sclk to CLK_48EN_RATE, otherwise codec + * pcm512x_dai_startup_master method could call + * snd_pcm_hw_constraint_ratnums using CLK_44EN/64 + * which will mask 384k sample rate. + */ + if (!IS_ERR(priv->sclk)) + clk_set_rate(priv->sclk, CLK_48EN_RATE); + } + + return 0; +} + +static void snd_allo_boss_shutdown( + struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_component *component = rtd->codec_dai->component; + + snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08, 0x00); +} + +static int snd_allo_boss_prepare( + struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_card *card = rtd->card; + + snd_allo_boss_gpio_unmute(card); + return 0; +} +/* machine stream operations */ +static struct snd_soc_ops snd_allo_boss_ops = { + .hw_params = snd_allo_boss_hw_params, + .startup = snd_allo_boss_startup, + .shutdown = snd_allo_boss_shutdown, + .prepare = snd_allo_boss_prepare, +}; + +static struct snd_soc_dai_link snd_allo_boss_dai[] = { +{ + .name = "Boss DAC", + .stream_name = "Boss DAC HiFi", + .cpu_dai_name = "bcm2708-i2s.0", + .codec_dai_name = "pcm512x-hifi", + .platform_name = "bcm2708-i2s.0", + .codec_name = "pcm512x.1-004d", + .dai_fmt = SND_SOC_DAIFMT_I2S | + SND_SOC_DAIFMT_NB_NF | + SND_SOC_DAIFMT_CBS_CFS, + .ops = &snd_allo_boss_ops, + .init = snd_allo_boss_init, +}, +}; + +/* audio machine driver */ +static struct snd_soc_card snd_allo_boss = { + .name = "BossDAC", + .owner = THIS_MODULE, + .dai_link = snd_allo_boss_dai, + .num_links = ARRAY_SIZE(snd_allo_boss_dai), +}; + +static int snd_allo_boss_probe(struct platform_device *pdev) +{ + int ret = 0; + + snd_allo_boss.dev = &pdev->dev; + + if (pdev->dev.of_node) { + struct device_node *i2s_node; + struct snd_soc_dai_link *dai; + + dai = &snd_allo_boss_dai[0]; + i2s_node = of_parse_phandle(pdev->dev.of_node, + "i2s-controller", 0); + + if (i2s_node) { + dai->cpu_dai_name = NULL; + dai->cpu_of_node = i2s_node; + dai->platform_name = NULL; + dai->platform_of_node = i2s_node; + } + + digital_gain_0db_limit = !of_property_read_bool( + pdev->dev.of_node, "allo,24db_digital_gain"); + slave = of_property_read_bool(pdev->dev.of_node, + "allo,slave"); + + mute_gpio = devm_gpiod_get_optional(&pdev->dev, "mute", + GPIOD_OUT_LOW); + if (IS_ERR(mute_gpio)) { + ret = PTR_ERR(mute_gpio); + dev_err(&pdev->dev, + "failed to get mute gpio: %d\n", ret); + return ret; + } + + if (mute_gpio) + snd_allo_boss.set_bias_level = + snd_allo_boss_set_bias_level; + + ret = snd_soc_register_card(&snd_allo_boss); + if (ret) { + dev_err(&pdev->dev, + "snd_soc_register_card() failed: %d\n", ret); + return ret; + } + + if (mute_gpio) + snd_allo_boss_gpio_mute(&snd_allo_boss); + + return 0; + } + + return -EINVAL; +} + +static int snd_allo_boss_remove(struct platform_device *pdev) +{ + snd_allo_boss_gpio_mute(&snd_allo_boss); + return snd_soc_unregister_card(&snd_allo_boss); +} + +static const struct of_device_id snd_allo_boss_of_match[] = { + { .compatible = "allo,boss-dac", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, snd_allo_boss_of_match); + +static struct platform_driver snd_allo_boss_driver = { + .driver = { + .name = "snd-allo-boss-dac", + .owner = THIS_MODULE, + .of_match_table = snd_allo_boss_of_match, + }, + .probe = snd_allo_boss_probe, + .remove = snd_allo_boss_remove, +}; + +module_platform_driver(snd_allo_boss_driver); + +MODULE_AUTHOR("Baswaraj K "); +MODULE_DESCRIPTION("ALSA ASoC Machine Driver for Allo Boss DAC"); +MODULE_LICENSE("GPL v2");