// SPDX-License-Identifier: (GPL-2.0 OR MIT) // // Copyright (c) 2018 BayLibre, SAS. // Author: Jerome Brunet #include #include #include #include #include #include #include #include #define SPDIFIN_CTRL0 0x00 #define SPDIFIN_CTRL0_EN BIT(31) #define SPDIFIN_CTRL0_RST_OUT BIT(29) #define SPDIFIN_CTRL0_RST_IN BIT(28) #define SPDIFIN_CTRL0_WIDTH_SEL BIT(24) #define SPDIFIN_CTRL0_STATUS_CH_SHIFT 11 #define SPDIFIN_CTRL0_STATUS_SEL GENMASK(10, 8) #define SPDIFIN_CTRL0_SRC_SEL GENMASK(5, 4) #define SPDIFIN_CTRL0_CHK_VALID BIT(3) #define SPDIFIN_CTRL1 0x04 #define SPDIFIN_CTRL1_BASE_TIMER GENMASK(19, 0) #define SPDIFIN_CTRL1_IRQ_MASK GENMASK(27, 20) #define SPDIFIN_CTRL2 0x08 #define SPDIFIN_THRES_PER_REG 3 #define SPDIFIN_THRES_WIDTH 10 #define SPDIFIN_CTRL3 0x0c #define SPDIFIN_CTRL4 0x10 #define SPDIFIN_TIMER_PER_REG 4 #define SPDIFIN_TIMER_WIDTH 8 #define SPDIFIN_CTRL5 0x14 #define SPDIFIN_CTRL6 0x18 #define SPDIFIN_STAT0 0x1c #define SPDIFIN_STAT0_MODE GENMASK(30, 28) #define SPDIFIN_STAT0_MAXW GENMASK(17, 8) #define SPDIFIN_STAT0_IRQ GENMASK(7, 0) #define SPDIFIN_IRQ_MODE_CHANGED BIT(2) #define SPDIFIN_STAT1 0x20 #define SPDIFIN_STAT2 0x24 #define SPDIFIN_MUTE_VAL 0x28 #define SPDIFIN_MODE_NUM 7 struct axg_spdifin_cfg { const unsigned int *mode_rates; unsigned int ref_rate; }; struct axg_spdifin { const struct axg_spdifin_cfg *conf; struct regmap *map; struct clk *refclk; struct clk *pclk; }; /* * TODO: * It would have been nice to check the actual rate against the sample rate * requested in hw_params(). Unfortunately, I was not able to make the mode * detection and IRQ work reliably: * * 1. IRQs are generated on mode change only, so there is no notification * on transition between no signal and mode 0 (32kHz). * 2. Mode detection very often has glitches, and may detects the * lowest or the highest mode before zeroing in on the actual mode. * * This makes calling snd_pcm_stop() difficult to get right. Even notifying * the kcontrol would be very unreliable at this point. * Let's keep things simple until the magic spell that makes this work is * found. */ static unsigned int axg_spdifin_get_rate(struct axg_spdifin *priv) { unsigned int stat, mode, rate = 0; regmap_read(priv->map, SPDIFIN_STAT0, &stat); mode = FIELD_GET(SPDIFIN_STAT0_MODE, stat); /* * If max width is zero, we are not capturing anything. * Also Sometimes, when the capture is on but there is no data, * mode is SPDIFIN_MODE_NUM, but not always ... */ if (FIELD_GET(SPDIFIN_STAT0_MAXW, stat) && mode < SPDIFIN_MODE_NUM) rate = priv->conf->mode_rates[mode]; return rate; } static int axg_spdifin_prepare(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct axg_spdifin *priv = snd_soc_dai_get_drvdata(dai); /* Apply both reset */ regmap_update_bits(priv->map, SPDIFIN_CTRL0, SPDIFIN_CTRL0_RST_OUT | SPDIFIN_CTRL0_RST_IN, 0); /* Clear out reset before in reset */ regmap_update_bits(priv->map, SPDIFIN_CTRL0, SPDIFIN_CTRL0_RST_OUT, SPDIFIN_CTRL0_RST_OUT); regmap_update_bits(priv->map, SPDIFIN_CTRL0, SPDIFIN_CTRL0_RST_IN, SPDIFIN_CTRL0_RST_IN); return 0; } static int axg_spdifin_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct axg_spdifin *priv = snd_soc_dai_get_drvdata(dai); int ret; ret = clk_prepare_enable(priv->refclk); if (ret) { dev_err(dai->dev, "failed to enable spdifin reference clock\n"); return ret; } regmap_update_bits(priv->map, SPDIFIN_CTRL0, SPDIFIN_CTRL0_EN, SPDIFIN_CTRL0_EN); return 0; } static void axg_spdifin_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct axg_spdifin *priv = snd_soc_dai_get_drvdata(dai); regmap_update_bits(priv->map, SPDIFIN_CTRL0, SPDIFIN_CTRL0_EN, 0); clk_disable_unprepare(priv->refclk); } static void axg_spdifin_write_mode_param(struct regmap *map, int mode, unsigned int val, unsigned int num_per_reg, unsigned int base_reg, unsigned int width) { unsigned int offset = mode, rem; unsigned int reg, shift; rem = do_div(offset, num_per_reg); reg = offset * regmap_get_reg_stride(map) + base_reg; shift = width * (num_per_reg - 1 - rem); regmap_update_bits(map, reg, GENMASK(width - 1, 0) << shift, val << shift); } static void axg_spdifin_write_timer(struct regmap *map, int mode, unsigned int val) { axg_spdifin_write_mode_param(map, mode, val, SPDIFIN_TIMER_PER_REG, SPDIFIN_CTRL4, SPDIFIN_TIMER_WIDTH); } static void axg_spdifin_write_threshold(struct regmap *map, int mode, unsigned int val) { axg_spdifin_write_mode_param(map, mode, val, SPDIFIN_THRES_PER_REG, SPDIFIN_CTRL2, SPDIFIN_THRES_WIDTH); } static unsigned int axg_spdifin_mode_timer(struct axg_spdifin *priv, int mode, unsigned int rate) { /* * Number of period of the reference clock during a period of the * input signal reference clock */ return rate / (128 * priv->conf->mode_rates[mode]); } static int axg_spdifin_sample_mode_config(struct snd_soc_dai *dai, struct axg_spdifin *priv) { unsigned int rate, t_next; int ret, i = SPDIFIN_MODE_NUM - 1; /* Set spdif input reference clock */ ret = clk_set_rate(priv->refclk, priv->conf->ref_rate); if (ret) { dev_err(dai->dev, "reference clock rate set failed\n"); return ret; } /* * The rate actually set might be slightly different, get * the actual rate for the following mode calculation */ rate = clk_get_rate(priv->refclk); /* HW will update mode every 1ms */ regmap_update_bits(priv->map, SPDIFIN_CTRL1, SPDIFIN_CTRL1_BASE_TIMER, FIELD_PREP(SPDIFIN_CTRL1_BASE_TIMER, rate / 1000)); /* Threshold based on the minimum width between two edges */ regmap_update_bits(priv->map, SPDIFIN_CTRL0, SPDIFIN_CTRL0_WIDTH_SEL, SPDIFIN_CTRL0_WIDTH_SEL); /* Calculate the last timer which has no threshold */ t_next = axg_spdifin_mode_timer(priv, i, rate); axg_spdifin_write_timer(priv->map, i, t_next); do { unsigned int t; i -= 1; /* Calculate the timer */ t = axg_spdifin_mode_timer(priv, i, rate); /* Set the timer value */ axg_spdifin_write_timer(priv->map, i, t); /* Set the threshold value */ axg_spdifin_write_threshold(priv->map, i, t + t_next); /* Save the current timer for the next threshold calculation */ t_next = t; } while (i > 0); return 0; } static int axg_spdifin_dai_probe(struct snd_soc_dai *dai) { struct axg_spdifin *priv = snd_soc_dai_get_drvdata(dai); int ret; ret = clk_prepare_enable(priv->pclk); if (ret) { dev_err(dai->dev, "failed to enable pclk\n"); return ret; } ret = axg_spdifin_sample_mode_config(dai, priv); if (ret) { dev_err(dai->dev, "mode configuration failed\n"); clk_disable_unprepare(priv->pclk); return ret; } return 0; } static int axg_spdifin_dai_remove(struct snd_soc_dai *dai) { struct axg_spdifin *priv = snd_soc_dai_get_drvdata(dai); clk_disable_unprepare(priv->pclk); return 0; } static const struct snd_soc_dai_ops axg_spdifin_ops = { .prepare = axg_spdifin_prepare, .startup = axg_spdifin_startup, .shutdown = axg_spdifin_shutdown, }; static int axg_spdifin_iec958_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) { uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958; uinfo->count = 1; return 0; } static int axg_spdifin_get_status_mask(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { int i; for (i = 0; i < 24; i++) ucontrol->value.iec958.status[i] = 0xff; return 0; } static int axg_spdifin_get_status(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_soc_component *c = snd_kcontrol_chip(kcontrol); struct axg_spdifin *priv = snd_soc_component_get_drvdata(c); int i, j; for (i = 0; i < 6; i++) { unsigned int val; regmap_update_bits(priv->map, SPDIFIN_CTRL0, SPDIFIN_CTRL0_STATUS_SEL, FIELD_PREP(SPDIFIN_CTRL0_STATUS_SEL, i)); regmap_read(priv->map, SPDIFIN_STAT1, &val); for (j = 0; j < 4; j++) { unsigned int offset = i * 4 + j; ucontrol->value.iec958.status[offset] = (val >> (j * 8)) & 0xff; } } return 0; } #define AXG_SPDIFIN_IEC958_MASK \ { \ .access = SNDRV_CTL_ELEM_ACCESS_READ, \ .iface = SNDRV_CTL_ELEM_IFACE_PCM, \ .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, MASK), \ .info = axg_spdifin_iec958_info, \ .get = axg_spdifin_get_status_mask, \ } #define AXG_SPDIFIN_IEC958_STATUS \ { \ .access = (SNDRV_CTL_ELEM_ACCESS_READ | \ SNDRV_CTL_ELEM_ACCESS_VOLATILE), \ .iface = SNDRV_CTL_ELEM_IFACE_PCM, \ .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, NONE), \ .info = axg_spdifin_iec958_info, \ .get = axg_spdifin_get_status, \ } static const char * const spdifin_chsts_src_texts[] = { "A", "B", }; static SOC_ENUM_SINGLE_DECL(axg_spdifin_chsts_src_enum, SPDIFIN_CTRL0, SPDIFIN_CTRL0_STATUS_CH_SHIFT, spdifin_chsts_src_texts); static int axg_spdifin_rate_lock_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) { uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; uinfo->count = 1; uinfo->value.integer.min = 0; uinfo->value.integer.max = 192000; return 0; } static int axg_spdifin_rate_lock_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_soc_component *c = snd_kcontrol_chip(kcontrol); struct axg_spdifin *priv = snd_soc_component_get_drvdata(c); ucontrol->value.integer.value[0] = axg_spdifin_get_rate(priv); return 0; } #define AXG_SPDIFIN_LOCK_RATE(xname) \ { \ .iface = SNDRV_CTL_ELEM_IFACE_PCM, \ .access = (SNDRV_CTL_ELEM_ACCESS_READ | \ SNDRV_CTL_ELEM_ACCESS_VOLATILE), \ .get = axg_spdifin_rate_lock_get, \ .info = axg_spdifin_rate_lock_info, \ .name = xname, \ } static const struct snd_kcontrol_new axg_spdifin_controls[] = { AXG_SPDIFIN_LOCK_RATE("Capture Rate Lock"), SOC_DOUBLE("Capture Switch", SPDIFIN_CTRL0, 7, 6, 1, 1), SOC_ENUM(SNDRV_CTL_NAME_IEC958("", CAPTURE, NONE) "Src", axg_spdifin_chsts_src_enum), AXG_SPDIFIN_IEC958_MASK, AXG_SPDIFIN_IEC958_STATUS, }; static const struct snd_soc_component_driver axg_spdifin_component_drv = { .controls = axg_spdifin_controls, .num_controls = ARRAY_SIZE(axg_spdifin_controls), }; static const struct regmap_config axg_spdifin_regmap_cfg = { .reg_bits = 32, .val_bits = 32, .reg_stride = 4, .max_register = SPDIFIN_MUTE_VAL, }; static const unsigned int axg_spdifin_mode_rates[SPDIFIN_MODE_NUM] = { 32000, 44100, 48000, 88200, 96000, 176400, 192000, }; static const struct axg_spdifin_cfg axg_cfg = { .mode_rates = axg_spdifin_mode_rates, .ref_rate = 333333333, }; static const struct of_device_id axg_spdifin_of_match[] = { { .compatible = "amlogic,axg-spdifin", .data = &axg_cfg, }, {} }; MODULE_DEVICE_TABLE(of, axg_spdifin_of_match); static struct snd_soc_dai_driver * axg_spdifin_get_dai_drv(struct device *dev, struct axg_spdifin *priv) { struct snd_soc_dai_driver *drv; int i; drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); if (!drv) return ERR_PTR(-ENOMEM); drv->name = "SPDIF Input"; drv->ops = &axg_spdifin_ops; drv->probe = axg_spdifin_dai_probe; drv->remove = axg_spdifin_dai_remove; drv->capture.stream_name = "Capture"; drv->capture.channels_min = 1; drv->capture.channels_max = 2; drv->capture.formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE; for (i = 0; i < SPDIFIN_MODE_NUM; i++) { unsigned int rb = snd_pcm_rate_to_rate_bit(priv->conf->mode_rates[i]); if (rb == SNDRV_PCM_RATE_KNOT) return ERR_PTR(-EINVAL); drv->capture.rates |= rb; } return drv; } static int axg_spdifin_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct axg_spdifin *priv; struct snd_soc_dai_driver *dai_drv; struct resource *res; void __iomem *regs; int ret; priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; platform_set_drvdata(pdev, priv); priv->conf = of_device_get_match_data(dev); if (!priv->conf) { dev_err(dev, "failed to match device\n"); return -ENODEV; } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); regs = devm_ioremap_resource(dev, res); if (IS_ERR(regs)) return PTR_ERR(regs); priv->map = devm_regmap_init_mmio(dev, regs, &axg_spdifin_regmap_cfg); if (IS_ERR(priv->map)) { dev_err(dev, "failed to init regmap: %ld\n", PTR_ERR(priv->map)); return PTR_ERR(priv->map); } priv->pclk = devm_clk_get(dev, "pclk"); if (IS_ERR(priv->pclk)) { ret = PTR_ERR(priv->pclk); if (ret != -EPROBE_DEFER) dev_err(dev, "failed to get pclk: %d\n", ret); return ret; } priv->refclk = devm_clk_get(dev, "refclk"); if (IS_ERR(priv->refclk)) { ret = PTR_ERR(priv->refclk); if (ret != -EPROBE_DEFER) dev_err(dev, "failed to get mclk: %d\n", ret); return ret; } dai_drv = axg_spdifin_get_dai_drv(dev, priv); if (IS_ERR(dai_drv)) { dev_err(dev, "failed to get dai driver: %ld\n", PTR_ERR(dai_drv)); return PTR_ERR(dai_drv); } return devm_snd_soc_register_component(dev, &axg_spdifin_component_drv, dai_drv, 1); } static struct platform_driver axg_spdifin_pdrv = { .probe = axg_spdifin_probe, .driver = { .name = "axg-spdifin", .of_match_table = axg_spdifin_of_match, }, }; module_platform_driver(axg_spdifin_pdrv); MODULE_DESCRIPTION("Amlogic AXG SPDIF Input driver"); MODULE_AUTHOR("Jerome Brunet "); MODULE_LICENSE("GPL v2");