diff options
Diffstat (limited to 'sound/soc/codecs/pcm512x.c')
| -rw-r--r-- | sound/soc/codecs/pcm512x.c | 458 |
1 files changed, 435 insertions, 23 deletions
diff --git a/sound/soc/codecs/pcm512x.c b/sound/soc/codecs/pcm512x.c index 526e6b30cdde..66dd036f0141 100644 --- a/sound/soc/codecs/pcm512x.c +++ b/sound/soc/codecs/pcm512x.c @@ -21,6 +21,7 @@ #include <linux/pm_runtime.h> #include <linux/regmap.h> #include <linux/regulator/consumer.h> +#include <linux/gcd.h> #include <sound/soc.h> #include <sound/soc-dapm.h> #include <sound/pcm_params.h> @@ -28,6 +29,11 @@ #include "pcm512x.h" +#define DIV_ROUND_DOWN_ULL(ll, d) \ + ({ unsigned long long _tmp = (ll); do_div(_tmp, d); _tmp; }) +#define DIV_ROUND_CLOSEST_ULL(ll, d) \ + ({ unsigned long long _tmp = (ll)+(d)/2; do_div(_tmp, d); _tmp; }) + #define PCM512x_NUM_SUPPLIES 3 static const char * const pcm512x_supply_names[PCM512x_NUM_SUPPLIES] = { "AVDD", @@ -41,6 +47,13 @@ struct pcm512x_priv { struct regulator_bulk_data supplies[PCM512x_NUM_SUPPLIES]; struct notifier_block supply_nb[PCM512x_NUM_SUPPLIES]; int fmt; + int pll_in; + int pll_out; + int pll_r; + int pll_j; + int pll_d; + int pll_p; + unsigned long real_pll; }; /* @@ -92,7 +105,13 @@ static const struct reg_default pcm512x_reg_defaults[] = { { PCM512x_VCOM_CTRL_2, 0x01 }, { PCM512x_BCLK_LRCLK_CFG, 0x00 }, { PCM512x_MASTER_MODE, 0x7c }, + { PCM512x_GPIO_PLLIN, 0x00 }, { PCM512x_SYNCHRONIZE, 0x10 }, + { PCM512x_PLL_COEFF_0, 0x00 }, + { PCM512x_PLL_COEFF_1, 0x00 }, + { PCM512x_PLL_COEFF_2, 0x00 }, + { PCM512x_PLL_COEFF_3, 0x00 }, + { PCM512x_PLL_COEFF_4, 0x00 }, { PCM512x_DSP_CLKDIV, 0x00 }, { PCM512x_DAC_CLKDIV, 0x00 }, { PCM512x_NCP_CLKDIV, 0x00 }, @@ -119,6 +138,7 @@ static bool pcm512x_readable(struct device *dev, unsigned int reg) case PCM512x_MASTER_MODE: case PCM512x_PLL_REF: case PCM512x_DAC_REF: + case PCM512x_GPIO_PLLIN: case PCM512x_SYNCHRONIZE: case PCM512x_PLL_COEFF_0: case PCM512x_PLL_COEFF_1: @@ -160,6 +180,7 @@ static bool pcm512x_readable(struct device *dev, unsigned int reg) case PCM512x_RATE_DET_2: case PCM512x_RATE_DET_3: case PCM512x_RATE_DET_4: + case PCM512x_CLOCK_STATUS: case PCM512x_ANALOG_MUTE_DET: case PCM512x_GPIN: case PCM512x_DIGITAL_MUTE_DET: @@ -171,6 +192,8 @@ static bool pcm512x_readable(struct device *dev, unsigned int reg) case PCM512x_VCOM_CTRL_1: case PCM512x_VCOM_CTRL_2: case PCM512x_CRAM_CTRL: + case PCM512x_FLEX_A: + case PCM512x_FLEX_B: return true; default: /* There are 256 raw register addresses */ @@ -187,6 +210,7 @@ static bool pcm512x_volatile(struct device *dev, unsigned int reg) case PCM512x_RATE_DET_2: case PCM512x_RATE_DET_3: case PCM512x_RATE_DET_4: + case PCM512x_CLOCK_STATUS: case PCM512x_ANALOG_MUTE_DET: case PCM512x_GPIN: case PCM512x_DIGITAL_MUTE_DET: @@ -330,6 +354,38 @@ static const struct snd_pcm_hw_constraint_list constraints_slave = { .list = pcm512x_dai_rates, }; +static const struct snd_interval pcm512x_dai_ranges_64bpf[] = { + { + .min = 8000, + .max = 195312, + }, { + .min = 250000, + .max = 390625, + }, +}; + +static struct snd_pcm_hw_constraint_ranges constraints_64bpf = { + .count = ARRAY_SIZE(pcm512x_dai_ranges_64bpf), + .ranges = pcm512x_dai_ranges_64bpf, +}; + +static int pcm512x_hw_rule_rate(struct snd_pcm_hw_params *params, + struct snd_pcm_hw_rule *rule) +{ + struct snd_pcm_hw_constraint_ranges *r = rule->private; + int frame_size; + + frame_size = snd_soc_params_to_frame_size(params); + if (frame_size < 0) + return frame_size; + + if (frame_size != 64) + return 0; + + return snd_interval_ranges(hw_param_interval(params, rule->var), + r->count, r->ranges, r->mask); +} + static int pcm512x_dai_startup_master(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { @@ -345,6 +401,14 @@ static int pcm512x_dai_startup_master(struct snd_pcm_substream *substream, return PTR_ERR(pcm512x->sclk); } + if (pcm512x->pll_out) + return snd_pcm_hw_rule_add(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_RATE, + pcm512x_hw_rule_rate, + (void *)&constraints_64bpf, + SNDRV_PCM_HW_PARAM_FRAME_BITS, + SNDRV_PCM_HW_PARAM_CHANNELS, -1); + constraints_no_pll = devm_kzalloc(dev, sizeof(*constraints_no_pll), GFP_KERNEL); if (!constraints_no_pll) @@ -445,12 +509,164 @@ static int pcm512x_set_bias_level(struct snd_soc_codec *codec, return 0; } +static unsigned long pcm512x_find_sck(struct snd_soc_dai *dai, + unsigned long bclk_rate) +{ + struct device *dev = dai->dev; + unsigned long sck_rate; + int pow2; + + /* 64 MHz <= pll_rate <= 100 MHz, VREF mode */ + /* 16 MHz <= sck_rate <= 25 MHz, VREF mode */ + + /* select sck_rate as a multiple of bclk_rate but still with + * as many factors of 2 as possible, as that makes it easier + * to find a fast DAC rate + */ + pow2 = 1 << fls((25000000 - 16000000) / bclk_rate); + for (; pow2; pow2 >>= 1) { + sck_rate = rounddown(25000000, bclk_rate * pow2); + if (sck_rate >= 16000000) + break; + } + if (!pow2) { + dev_err(dev, "Impossible to generate a suitable SCK\n"); + return 0; + } + + dev_dbg(dev, "sck_rate %lu\n", sck_rate); + return sck_rate; +} + +/* pll_rate = pllin_rate * R * J.D / P + * 1 <= R <= 16 + * 1 <= J <= 63 + * 0 <= D <= 9999 + * 1 <= P <= 15 + * 64 MHz <= pll_rate <= 100 MHz + * if D == 0 + * 1 MHz <= pllin_rate / P <= 20 MHz + * else if D > 0 + * 6.667 MHz <= pllin_rate / P <= 20 MHz + * 4 <= J <= 11 + * R = 1 + */ +static int pcm512x_find_pll_coeff(struct snd_soc_dai *dai, + unsigned long pllin_rate, + unsigned long pll_rate) +{ + struct device *dev = dai->dev; + struct snd_soc_codec *codec = dai->codec; + struct pcm512x_priv *pcm512x = snd_soc_codec_get_drvdata(codec); + unsigned long common; + int R, J, D, P; + unsigned long K; /* 10000 * J.D */ + unsigned long num; + unsigned long den; + + common = gcd(pll_rate, pllin_rate); + dev_dbg(dev, "pll %lu pllin %lu common %lu\n", + pll_rate, pllin_rate, common); + num = pll_rate / common; + den = pllin_rate / common; + + /* pllin_rate / P (or here, den) cannot be greater than 20 MHz */ + if (pllin_rate / den > 20000000 && num < 8) { + num *= 20000000 / (pllin_rate / den); + den *= 20000000 / (pllin_rate / den); + } + dev_dbg(dev, "num / den = %lu / %lu\n", num, den); + + P = den; + if (den <= 15 && num <= 16 * 63 + && 1000000 <= pllin_rate / P && pllin_rate / P <= 20000000) { + /* Try the case with D = 0 */ + D = 0; + /* factor 'num' into J and R, such that R <= 16 and J <= 63 */ + for (R = 16; R; R--) { + if (num % R) + continue; + J = num / R; + if (J == 0 || J > 63) + continue; + + dev_dbg(dev, "R * J / P = %d * %d / %d\n", R, J, P); + pcm512x->real_pll = pll_rate; + goto done; + } + /* no luck */ + } + + R = 1; + + if (num > 0xffffffffUL / 10000) + goto fallback; + + /* Try to find an exact pll_rate using the D > 0 case */ + common = gcd(10000 * num, den); + num = 10000 * num / common; + den /= common; + dev_dbg(dev, "num %lu den %lu common %lu\n", num, den, common); + + for (P = den; P <= 15; P++) { + if (pllin_rate / P < 6667000 || 200000000 < pllin_rate / P) + continue; + if (num * P % den) + continue; + K = num * P / den; + /* J == 12 is ok if D == 0 */ + if (K < 40000 || K > 120000) + continue; + + J = K / 10000; + D = K % 10000; + dev_dbg(dev, "J.D / P = %d.%04d / %d\n", J, D, P); + pcm512x->real_pll = pll_rate; + goto done; + } + + /* Fall back to an approximate pll_rate */ + +fallback: + /* find smallest possible P */ + P = DIV_ROUND_UP(pllin_rate, 20000000); + if (!P) + P = 1; + else if (P > 15) { + dev_err(dev, "Need a slower clock as pll-input\n"); + return -EINVAL; + } + if (pllin_rate / P < 6667000) { + dev_err(dev, "Need a faster clock as pll-input\n"); + return -EINVAL; + } + K = DIV_ROUND_CLOSEST_ULL(10000ULL * pll_rate * P, pllin_rate); + if (K < 40000) + K = 40000; + /* J == 12 is ok if D == 0 */ + if (K > 120000) + K = 120000; + J = K / 10000; + D = K % 10000; + dev_dbg(dev, "J.D / P ~ %d.%04d / %d\n", J, D, P); + pcm512x->real_pll = DIV_ROUND_DOWN_ULL((u64)K * pllin_rate, 10000 * P); + +done: + pcm512x->pll_r = R; + pcm512x->pll_j = J; + pcm512x->pll_d = D; + pcm512x->pll_p = P; + return 0; +} + static int pcm512x_set_dividers(struct snd_soc_dai *dai, struct snd_pcm_hw_params *params) { struct device *dev = dai->dev; struct snd_soc_codec *codec = dai->codec; struct pcm512x_priv *pcm512x = snd_soc_codec_get_drvdata(codec); + unsigned long pllin_rate = 0; + unsigned long pll_rate; unsigned long sck_rate; unsigned long mck_rate; unsigned long bclk_rate; @@ -475,11 +691,74 @@ static int pcm512x_set_dividers(struct snd_soc_dai *dai, return -EINVAL; } - sck_rate = clk_get_rate(pcm512x->sclk); - bclk_div = params->rate_den * 64 / lrclk_div; - bclk_rate = DIV_ROUND_CLOSEST(sck_rate, bclk_div); + if (!pcm512x->pll_out) { + sck_rate = clk_get_rate(pcm512x->sclk); + bclk_div = params->rate_den * 64 / lrclk_div; + bclk_rate = DIV_ROUND_CLOSEST(sck_rate, bclk_div); - mck_rate = sck_rate; + mck_rate = sck_rate; + } else { + ret = snd_soc_params_to_bclk(params); + if (ret < 0) { + dev_err(dev, "Failed to find suitable BCLK: %d\n", ret); + return ret; + } + if (ret == 0) { + dev_err(dev, "No BCLK?\n"); + return -EINVAL; + } + bclk_rate = ret; + + pllin_rate = clk_get_rate(pcm512x->sclk); + + sck_rate = pcm512x_find_sck(dai, bclk_rate); + if (!sck_rate) + return -EINVAL; + pll_rate = 4 * sck_rate; + + ret = pcm512x_find_pll_coeff(dai, pllin_rate, pll_rate); + if (ret != 0) + return ret; + + ret = regmap_write(pcm512x->regmap, + PCM512x_PLL_COEFF_0, pcm512x->pll_p - 1); + if (ret != 0) { + dev_err(dev, "Failed to write PLL P: %d\n", ret); + return ret; + } + + ret = regmap_write(pcm512x->regmap, + PCM512x_PLL_COEFF_1, pcm512x->pll_j); + if (ret != 0) { + dev_err(dev, "Failed to write PLL J: %d\n", ret); + return ret; + } + + ret = regmap_write(pcm512x->regmap, + PCM512x_PLL_COEFF_2, pcm512x->pll_d >> 8); + if (ret != 0) { + dev_err(dev, "Failed to write PLL D msb: %d\n", ret); + return ret; + } + + ret = regmap_write(pcm512x->regmap, + PCM512x_PLL_COEFF_3, pcm512x->pll_d & 0xff); + if (ret != 0) { + dev_err(dev, "Failed to write PLL D lsb: %d\n", ret); + return ret; + } + + ret = regmap_write(pcm512x->regmap, + PCM512x_PLL_COEFF_4, pcm512x->pll_r - 1); + if (ret != 0) { + dev_err(dev, "Failed to write PLL R: %d\n", ret); + return ret; + } + + mck_rate = pcm512x->real_pll; + + bclk_div = DIV_ROUND_CLOSEST(sck_rate, bclk_rate); + } if (bclk_div > 128) { dev_err(dev, "Failed to find BCLK divider\n"); @@ -616,6 +895,7 @@ static int pcm512x_hw_params(struct snd_pcm_substream *substream, struct snd_soc_codec *codec = dai->codec; struct pcm512x_priv *pcm512x = snd_soc_codec_get_drvdata(codec); int alen; + int gpio; int ret; dev_dbg(codec->dev, "hw_params %u Hz, %u channels\n", @@ -676,26 +956,55 @@ static int pcm512x_hw_params(struct snd_pcm_substream *substream, return ret; } - ret = regmap_update_bits(pcm512x->regmap, PCM512x_ERROR_DETECT, - PCM512x_IDFS | PCM512x_IDBK - | PCM512x_IDSK | PCM512x_IDCH - | PCM512x_IDCM | PCM512x_DCAS - | PCM512x_IPLK, - PCM512x_IDFS | PCM512x_IDBK - | PCM512x_IDSK | PCM512x_IDCH - | PCM512x_DCAS | PCM512x_IPLK); - if (ret != 0) { - dev_err(codec->dev, - "Failed to ignore auto-clock failures: %d\n", - ret); - return ret; - } + if (pcm512x->pll_out) { + ret = regmap_write(pcm512x->regmap, PCM512x_FLEX_A, 0x11); + if (ret != 0) { + dev_err(codec->dev, "Failed to set FLEX_A: %d\n", ret); + return ret; + } - ret = regmap_update_bits(pcm512x->regmap, PCM512x_PLL_EN, - PCM512x_PLLE, 0); - if (ret != 0) { - dev_err(codec->dev, "Failed to disable pll: %d\n", ret); - return ret; + ret = regmap_write(pcm512x->regmap, PCM512x_FLEX_B, 0xff); + if (ret != 0) { + dev_err(codec->dev, "Failed to set FLEX_B: %d\n", ret); + return ret; + } + + ret = regmap_update_bits(pcm512x->regmap, PCM512x_ERROR_DETECT, + PCM512x_IDFS | PCM512x_IDBK + | PCM512x_IDSK | PCM512x_IDCH + | PCM512x_IDCM | PCM512x_DCAS + | PCM512x_IPLK, + PCM512x_IDFS | PCM512x_IDBK + | PCM512x_IDSK | PCM512x_IDCH + | PCM512x_DCAS); + if (ret != 0) { + dev_err(codec->dev, + "Failed to ignore auto-clock failures: %d\n", + ret); + return ret; + } + } else { + ret = regmap_update_bits(pcm512x->regmap, PCM512x_ERROR_DETECT, + PCM512x_IDFS | PCM512x_IDBK + | PCM512x_IDSK | PCM512x_IDCH + | PCM512x_IDCM | PCM512x_DCAS + | PCM512x_IPLK, + PCM512x_IDFS | PCM512x_IDBK + | PCM512x_IDSK | PCM512x_IDCH + | PCM512x_DCAS | PCM512x_IPLK); + if (ret != 0) { + dev_err(codec->dev, + "Failed to ignore auto-clock failures: %d\n", + ret); + return ret; + } + + ret = regmap_update_bits(pcm512x->regmap, PCM512x_PLL_EN, + PCM512x_PLLE, 0); + if (ret != 0) { + dev_err(codec->dev, "Failed to disable pll: %d\n", ret); + return ret; + } } ret = pcm512x_set_dividers(dai, params); @@ -709,6 +1018,33 @@ static int pcm512x_hw_params(struct snd_pcm_substream *substream, return ret; } + if (pcm512x->pll_out) { + ret = regmap_update_bits(pcm512x->regmap, PCM512x_PLL_REF, + PCM512x_SREF, PCM512x_SREF_GPIO); + if (ret != 0) { + dev_err(codec->dev, + "Failed to set gpio as pllref: %d\n", ret); + return ret; + } + + gpio = PCM512x_GREF_GPIO1 + pcm512x->pll_in - 1; + ret = regmap_update_bits(pcm512x->regmap, PCM512x_GPIO_PLLIN, + PCM512x_GREF, gpio); + if (ret != 0) { + dev_err(codec->dev, + "Failed to set gpio %d as pllin: %d\n", + pcm512x->pll_in, ret); + return ret; + } + + ret = regmap_update_bits(pcm512x->regmap, PCM512x_PLL_EN, + PCM512x_PLLE, PCM512x_PLLE); + if (ret != 0) { + dev_err(codec->dev, "Failed to enable pll: %d\n", ret); + return ret; + } + } + ret = regmap_update_bits(pcm512x->regmap, PCM512x_BCLK_LRCLK_CFG, PCM512x_BCKP | PCM512x_BCKO | PCM512x_LRKO, PCM512x_BCKO | PCM512x_LRKO); @@ -725,6 +1061,45 @@ static int pcm512x_hw_params(struct snd_pcm_substream *substream, return ret; } + if (pcm512x->pll_out) { + gpio = PCM512x_G1OE << (pcm512x->pll_out - 1); + ret = regmap_update_bits(pcm512x->regmap, PCM512x_GPIO_EN, + gpio, gpio); + if (ret != 0) { + dev_err(codec->dev, "Failed to enable gpio %d: %d\n", + pcm512x->pll_out, ret); + return ret; + } + + gpio = PCM512x_GPIO_OUTPUT_1 + pcm512x->pll_out - 1; + ret = regmap_update_bits(pcm512x->regmap, gpio, + PCM512x_GxSL, PCM512x_GxSL_PLLCK); + if (ret != 0) { + dev_err(codec->dev, "Failed to output pll on %d: %d\n", + ret, pcm512x->pll_out); + return ret; + } + + gpio = PCM512x_G1OE << (4 - 1); + ret = regmap_update_bits(pcm512x->regmap, PCM512x_GPIO_EN, + gpio, gpio); + if (ret != 0) { + dev_err(codec->dev, "Failed to enable gpio %d: %d\n", + 4, ret); + return ret; + } + + gpio = PCM512x_GPIO_OUTPUT_1 + 4 - 1; + ret = regmap_update_bits(pcm512x->regmap, gpio, + PCM512x_GxSL, PCM512x_GxSL_PLLLK); + if (ret != 0) { + dev_err(codec->dev, + "Failed to output pll lock on %d: %d\n", + ret, 4); + return ret; + } + } + ret = regmap_update_bits(pcm512x->regmap, PCM512x_SYNCHRONIZE, PCM512x_RQSY, PCM512x_RQSY_HALT); if (ret != 0) { @@ -815,6 +1190,7 @@ int pcm512x_probe(struct device *dev, struct regmap *regmap) { struct pcm512x_priv *pcm512x; int i, ret; + u32 val; pcm512x = devm_kzalloc(dev, sizeof(struct pcm512x_priv), GFP_KERNEL); if (!pcm512x) @@ -892,6 +1268,42 @@ int pcm512x_probe(struct device *dev, struct regmap *regmap) pm_runtime_enable(dev); pm_runtime_idle(dev); +#ifdef CONFIG_OF + if (dev->of_node) { + const struct device_node *np = dev->of_node; + + if (of_property_read_u32(np, "pll-in", &val) >= 0) { + if (val > 6) { + dev_err(dev, "Invalid pll-in\n"); + ret = -EINVAL; + goto err_clk; + } + pcm512x->pll_in = val; + } + + if (of_property_read_u32(np, "pll-out", &val) >= 0) { + if (val > 6) { + dev_err(dev, "Invalid pll-out\n"); + ret = -EINVAL; + goto err_clk; + } + pcm512x->pll_out = val; + } + + if (!pcm512x->pll_in != !pcm512x->pll_out) { + dev_err(dev, + "Error: both pll-in and pll-out, or none\n"); + ret = -EINVAL; + goto err_clk; + } + if (pcm512x->pll_in && pcm512x->pll_in == pcm512x->pll_out) { + dev_err(dev, "Error: pll-in == pll-out\n"); + ret = -EINVAL; + goto err_clk; + } + } +#endif + ret = snd_soc_register_codec(dev, &pcm512x_codec_driver, &pcm512x_dai, 1); if (ret != 0) { |