diff options
Diffstat (limited to '')
| -rw-r--r-- | sound/soc/qcom/lpass-platform.c | 608 |
1 files changed, 608 insertions, 0 deletions
diff --git a/sound/soc/qcom/lpass-platform.c b/sound/soc/qcom/lpass-platform.c new file mode 100644 index 000000000..1d06e2b7b --- /dev/null +++ b/sound/soc/qcom/lpass-platform.c @@ -0,0 +1,608 @@ +/* + * Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only 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. + * + * lpass-platform.c -- ALSA SoC platform driver for QTi LPASS + */ + +#include <linux/dma-mapping.h> +#include <linux/export.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <sound/pcm_params.h> +#include <linux/regmap.h> +#include <sound/soc.h> +#include "lpass-lpaif-reg.h" +#include "lpass.h" + +#define DRV_NAME "lpass-platform" + +struct lpass_pcm_data { + int dma_ch; + int i2s_port; +}; + +#define LPASS_PLATFORM_BUFFER_SIZE (16 * 1024) +#define LPASS_PLATFORM_PERIODS 2 + +static const struct snd_pcm_hardware lpass_platform_pcm_hardware = { + .info = SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID | + SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_PAUSE | + SNDRV_PCM_INFO_RESUME, + .formats = SNDRV_PCM_FMTBIT_S16 | + SNDRV_PCM_FMTBIT_S24 | + SNDRV_PCM_FMTBIT_S32, + .rates = SNDRV_PCM_RATE_8000_192000, + .rate_min = 8000, + .rate_max = 192000, + .channels_min = 1, + .channels_max = 8, + .buffer_bytes_max = LPASS_PLATFORM_BUFFER_SIZE, + .period_bytes_max = LPASS_PLATFORM_BUFFER_SIZE / + LPASS_PLATFORM_PERIODS, + .period_bytes_min = LPASS_PLATFORM_BUFFER_SIZE / + LPASS_PLATFORM_PERIODS, + .periods_min = LPASS_PLATFORM_PERIODS, + .periods_max = LPASS_PLATFORM_PERIODS, + .fifo_size = 0, +}; + +static int lpass_platform_pcmops_open(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; + struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai; + struct snd_soc_component *component = snd_soc_rtdcom_lookup(soc_runtime, DRV_NAME); + struct lpass_data *drvdata = snd_soc_component_get_drvdata(component); + struct lpass_variant *v = drvdata->variant; + int ret, dma_ch, dir = substream->stream; + struct lpass_pcm_data *data; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->i2s_port = cpu_dai->driver->id; + runtime->private_data = data; + + if (v->alloc_dma_channel) + dma_ch = v->alloc_dma_channel(drvdata, dir); + else + dma_ch = 0; + + if (dma_ch < 0) { + kfree(data); + return dma_ch; + } + + drvdata->substream[dma_ch] = substream; + + ret = regmap_write(drvdata->lpaif_map, + LPAIF_DMACTL_REG(v, dma_ch, dir), 0); + if (ret) { + dev_err(soc_runtime->dev, + "error writing to rdmactl reg: %d\n", ret); + return ret; + } + + data->dma_ch = dma_ch; + + snd_soc_set_runtime_hwparams(substream, &lpass_platform_pcm_hardware); + + runtime->dma_bytes = lpass_platform_pcm_hardware.buffer_bytes_max; + + ret = snd_pcm_hw_constraint_integer(runtime, + SNDRV_PCM_HW_PARAM_PERIODS); + if (ret < 0) { + kfree(data); + dev_err(soc_runtime->dev, "setting constraints failed: %d\n", + ret); + return -EINVAL; + } + + snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); + + return 0; +} + +static int lpass_platform_pcmops_close(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; + struct snd_soc_component *component = snd_soc_rtdcom_lookup(soc_runtime, DRV_NAME); + struct lpass_data *drvdata = snd_soc_component_get_drvdata(component); + struct lpass_variant *v = drvdata->variant; + struct lpass_pcm_data *data; + + data = runtime->private_data; + drvdata->substream[data->dma_ch] = NULL; + if (v->free_dma_channel) + v->free_dma_channel(drvdata, data->dma_ch); + + kfree(data); + return 0; +} + +static int lpass_platform_pcmops_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; + struct snd_soc_component *component = snd_soc_rtdcom_lookup(soc_runtime, DRV_NAME); + struct lpass_data *drvdata = snd_soc_component_get_drvdata(component); + struct snd_pcm_runtime *rt = substream->runtime; + struct lpass_pcm_data *pcm_data = rt->private_data; + struct lpass_variant *v = drvdata->variant; + snd_pcm_format_t format = params_format(params); + unsigned int channels = params_channels(params); + unsigned int regval; + int ch, dir = substream->stream; + int bitwidth; + int ret, dma_port = pcm_data->i2s_port + v->dmactl_audif_start; + + ch = pcm_data->dma_ch; + + bitwidth = snd_pcm_format_width(format); + if (bitwidth < 0) { + dev_err(soc_runtime->dev, "invalid bit width given: %d\n", + bitwidth); + return bitwidth; + } + + regval = LPAIF_DMACTL_BURSTEN_INCR4 | + LPAIF_DMACTL_AUDINTF(dma_port) | + LPAIF_DMACTL_FIFOWM_8; + + switch (bitwidth) { + case 16: + switch (channels) { + case 1: + case 2: + regval |= LPAIF_DMACTL_WPSCNT_ONE; + break; + case 4: + regval |= LPAIF_DMACTL_WPSCNT_TWO; + break; + case 6: + regval |= LPAIF_DMACTL_WPSCNT_THREE; + break; + case 8: + regval |= LPAIF_DMACTL_WPSCNT_FOUR; + break; + default: + dev_err(soc_runtime->dev, + "invalid PCM config given: bw=%d, ch=%u\n", + bitwidth, channels); + return -EINVAL; + } + break; + case 24: + case 32: + switch (channels) { + case 1: + regval |= LPAIF_DMACTL_WPSCNT_ONE; + break; + case 2: + regval |= LPAIF_DMACTL_WPSCNT_TWO; + break; + case 4: + regval |= LPAIF_DMACTL_WPSCNT_FOUR; + break; + case 6: + regval |= LPAIF_DMACTL_WPSCNT_SIX; + break; + case 8: + regval |= LPAIF_DMACTL_WPSCNT_EIGHT; + break; + default: + dev_err(soc_runtime->dev, + "invalid PCM config given: bw=%d, ch=%u\n", + bitwidth, channels); + return -EINVAL; + } + break; + default: + dev_err(soc_runtime->dev, "invalid PCM config given: bw=%d, ch=%u\n", + bitwidth, channels); + return -EINVAL; + } + + ret = regmap_write(drvdata->lpaif_map, + LPAIF_DMACTL_REG(v, ch, dir), regval); + if (ret) { + dev_err(soc_runtime->dev, "error writing to rdmactl reg: %d\n", + ret); + return ret; + } + + return 0; +} + +static int lpass_platform_pcmops_hw_free(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; + struct snd_soc_component *component = snd_soc_rtdcom_lookup(soc_runtime, DRV_NAME); + struct lpass_data *drvdata = snd_soc_component_get_drvdata(component); + struct snd_pcm_runtime *rt = substream->runtime; + struct lpass_pcm_data *pcm_data = rt->private_data; + struct lpass_variant *v = drvdata->variant; + unsigned int reg; + int ret; + + reg = LPAIF_DMACTL_REG(v, pcm_data->dma_ch, substream->stream); + ret = regmap_write(drvdata->lpaif_map, reg, 0); + if (ret) + dev_err(soc_runtime->dev, "error writing to rdmactl reg: %d\n", + ret); + + return ret; +} + +static int lpass_platform_pcmops_prepare(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; + struct snd_soc_component *component = snd_soc_rtdcom_lookup(soc_runtime, DRV_NAME); + struct lpass_data *drvdata = snd_soc_component_get_drvdata(component); + struct snd_pcm_runtime *rt = substream->runtime; + struct lpass_pcm_data *pcm_data = rt->private_data; + struct lpass_variant *v = drvdata->variant; + int ret, ch, dir = substream->stream; + + ch = pcm_data->dma_ch; + + ret = regmap_write(drvdata->lpaif_map, + LPAIF_DMABASE_REG(v, ch, dir), + runtime->dma_addr); + if (ret) { + dev_err(soc_runtime->dev, "error writing to rdmabase reg: %d\n", + ret); + return ret; + } + + ret = regmap_write(drvdata->lpaif_map, + LPAIF_DMABUFF_REG(v, ch, dir), + (snd_pcm_lib_buffer_bytes(substream) >> 2) - 1); + if (ret) { + dev_err(soc_runtime->dev, "error writing to rdmabuff reg: %d\n", + ret); + return ret; + } + + ret = regmap_write(drvdata->lpaif_map, + LPAIF_DMAPER_REG(v, ch, dir), + (snd_pcm_lib_period_bytes(substream) >> 2) - 1); + if (ret) { + dev_err(soc_runtime->dev, "error writing to rdmaper reg: %d\n", + ret); + return ret; + } + + ret = regmap_update_bits(drvdata->lpaif_map, + LPAIF_DMACTL_REG(v, ch, dir), + LPAIF_DMACTL_ENABLE_MASK, LPAIF_DMACTL_ENABLE_ON); + if (ret) { + dev_err(soc_runtime->dev, "error writing to rdmactl reg: %d\n", + ret); + return ret; + } + + return 0; +} + +static int lpass_platform_pcmops_trigger(struct snd_pcm_substream *substream, + int cmd) +{ + struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; + struct snd_soc_component *component = snd_soc_rtdcom_lookup(soc_runtime, DRV_NAME); + struct lpass_data *drvdata = snd_soc_component_get_drvdata(component); + struct snd_pcm_runtime *rt = substream->runtime; + struct lpass_pcm_data *pcm_data = rt->private_data; + struct lpass_variant *v = drvdata->variant; + int ret, ch, dir = substream->stream; + + ch = pcm_data->dma_ch; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + /* clear status before enabling interrupts */ + ret = regmap_write(drvdata->lpaif_map, + LPAIF_IRQCLEAR_REG(v, LPAIF_IRQ_PORT_HOST), + LPAIF_IRQ_ALL(ch)); + if (ret) { + dev_err(soc_runtime->dev, + "error writing to irqclear reg: %d\n", ret); + return ret; + } + + ret = regmap_update_bits(drvdata->lpaif_map, + LPAIF_IRQEN_REG(v, LPAIF_IRQ_PORT_HOST), + LPAIF_IRQ_ALL(ch), + LPAIF_IRQ_ALL(ch)); + if (ret) { + dev_err(soc_runtime->dev, + "error writing to irqen reg: %d\n", ret); + return ret; + } + + ret = regmap_update_bits(drvdata->lpaif_map, + LPAIF_DMACTL_REG(v, ch, dir), + LPAIF_DMACTL_ENABLE_MASK, + LPAIF_DMACTL_ENABLE_ON); + if (ret) { + dev_err(soc_runtime->dev, + "error writing to rdmactl reg: %d\n", ret); + return ret; + } + break; + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + ret = regmap_update_bits(drvdata->lpaif_map, + LPAIF_DMACTL_REG(v, ch, dir), + LPAIF_DMACTL_ENABLE_MASK, + LPAIF_DMACTL_ENABLE_OFF); + if (ret) { + dev_err(soc_runtime->dev, + "error writing to rdmactl reg: %d\n", ret); + return ret; + } + + ret = regmap_update_bits(drvdata->lpaif_map, + LPAIF_IRQEN_REG(v, LPAIF_IRQ_PORT_HOST), + LPAIF_IRQ_ALL(ch), 0); + if (ret) { + dev_err(soc_runtime->dev, + "error writing to irqen reg: %d\n", ret); + return ret; + } + break; + } + + return 0; +} + +static snd_pcm_uframes_t lpass_platform_pcmops_pointer( + struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; + struct snd_soc_component *component = snd_soc_rtdcom_lookup(soc_runtime, DRV_NAME); + struct lpass_data *drvdata = snd_soc_component_get_drvdata(component); + struct snd_pcm_runtime *rt = substream->runtime; + struct lpass_pcm_data *pcm_data = rt->private_data; + struct lpass_variant *v = drvdata->variant; + unsigned int base_addr, curr_addr; + int ret, ch, dir = substream->stream; + + ch = pcm_data->dma_ch; + + ret = regmap_read(drvdata->lpaif_map, + LPAIF_DMABASE_REG(v, ch, dir), &base_addr); + if (ret) { + dev_err(soc_runtime->dev, + "error reading from rdmabase reg: %d\n", ret); + return ret; + } + + ret = regmap_read(drvdata->lpaif_map, + LPAIF_DMACURR_REG(v, ch, dir), &curr_addr); + if (ret) { + dev_err(soc_runtime->dev, + "error reading from rdmacurr reg: %d\n", ret); + return ret; + } + + return bytes_to_frames(substream->runtime, curr_addr - base_addr); +} + +static int lpass_platform_pcmops_mmap(struct snd_pcm_substream *substream, + struct vm_area_struct *vma) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + + return dma_mmap_coherent(substream->pcm->card->dev, vma, + runtime->dma_area, runtime->dma_addr, + runtime->dma_bytes); +} + +static const struct snd_pcm_ops lpass_platform_pcm_ops = { + .open = lpass_platform_pcmops_open, + .close = lpass_platform_pcmops_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = lpass_platform_pcmops_hw_params, + .hw_free = lpass_platform_pcmops_hw_free, + .prepare = lpass_platform_pcmops_prepare, + .trigger = lpass_platform_pcmops_trigger, + .pointer = lpass_platform_pcmops_pointer, + .mmap = lpass_platform_pcmops_mmap, +}; + +static irqreturn_t lpass_dma_interrupt_handler( + struct snd_pcm_substream *substream, + struct lpass_data *drvdata, + int chan, u32 interrupts) +{ + struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; + struct lpass_variant *v = drvdata->variant; + irqreturn_t ret = IRQ_NONE; + int rv; + + if (interrupts & LPAIF_IRQ_PER(chan)) { + rv = regmap_write(drvdata->lpaif_map, + LPAIF_IRQCLEAR_REG(v, LPAIF_IRQ_PORT_HOST), + LPAIF_IRQ_PER(chan)); + if (rv) { + dev_err(soc_runtime->dev, + "error writing to irqclear reg: %d\n", rv); + return IRQ_NONE; + } + snd_pcm_period_elapsed(substream); + ret = IRQ_HANDLED; + } + + if (interrupts & LPAIF_IRQ_XRUN(chan)) { + rv = regmap_write(drvdata->lpaif_map, + LPAIF_IRQCLEAR_REG(v, LPAIF_IRQ_PORT_HOST), + LPAIF_IRQ_XRUN(chan)); + if (rv) { + dev_err(soc_runtime->dev, + "error writing to irqclear reg: %d\n", rv); + return IRQ_NONE; + } + dev_warn(soc_runtime->dev, "xrun warning\n"); + snd_pcm_stop_xrun(substream); + ret = IRQ_HANDLED; + } + + if (interrupts & LPAIF_IRQ_ERR(chan)) { + rv = regmap_write(drvdata->lpaif_map, + LPAIF_IRQCLEAR_REG(v, LPAIF_IRQ_PORT_HOST), + LPAIF_IRQ_ERR(chan)); + if (rv) { + dev_err(soc_runtime->dev, + "error writing to irqclear reg: %d\n", rv); + return IRQ_NONE; + } + dev_err(soc_runtime->dev, "bus access error\n"); + snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED); + ret = IRQ_HANDLED; + } + + return ret; +} + +static irqreturn_t lpass_platform_lpaif_irq(int irq, void *data) +{ + struct lpass_data *drvdata = data; + struct lpass_variant *v = drvdata->variant; + unsigned int irqs; + int rv, chan; + + rv = regmap_read(drvdata->lpaif_map, + LPAIF_IRQSTAT_REG(v, LPAIF_IRQ_PORT_HOST), &irqs); + if (rv) { + pr_err("error reading from irqstat reg: %d\n", rv); + return IRQ_NONE; + } + + /* Handle per channel interrupts */ + for (chan = 0; chan < LPASS_MAX_DMA_CHANNELS; chan++) { + if (irqs & LPAIF_IRQ_ALL(chan) && drvdata->substream[chan]) { + rv = lpass_dma_interrupt_handler( + drvdata->substream[chan], + drvdata, chan, irqs); + if (rv != IRQ_HANDLED) + return rv; + } + } + + return IRQ_HANDLED; +} + +static int lpass_platform_pcm_new(struct snd_soc_pcm_runtime *soc_runtime) +{ + struct snd_pcm *pcm = soc_runtime->pcm; + struct snd_pcm_substream *psubstream, *csubstream; + struct snd_soc_component *component = snd_soc_rtdcom_lookup(soc_runtime, DRV_NAME); + int ret = -EINVAL; + size_t size = lpass_platform_pcm_hardware.buffer_bytes_max; + + psubstream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; + if (psubstream) { + ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, + component->dev, + size, &psubstream->dma_buffer); + if (ret) { + dev_err(soc_runtime->dev, "Cannot allocate buffer(s)\n"); + return ret; + } + } + + csubstream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; + if (csubstream) { + ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, + component->dev, + size, &csubstream->dma_buffer); + if (ret) { + dev_err(soc_runtime->dev, "Cannot allocate buffer(s)\n"); + if (psubstream) + snd_dma_free_pages(&psubstream->dma_buffer); + return ret; + } + + } + + return 0; +} + +static void lpass_platform_pcm_free(struct snd_pcm *pcm) +{ + struct snd_pcm_substream *substream; + int i; + + for (i = 0; i < ARRAY_SIZE(pcm->streams); i++) { + substream = pcm->streams[i].substream; + if (substream) { + snd_dma_free_pages(&substream->dma_buffer); + substream->dma_buffer.area = NULL; + substream->dma_buffer.addr = 0; + } + } +} + +static const struct snd_soc_component_driver lpass_component_driver = { + .name = DRV_NAME, + .pcm_new = lpass_platform_pcm_new, + .pcm_free = lpass_platform_pcm_free, + .ops = &lpass_platform_pcm_ops, +}; + +int asoc_qcom_lpass_platform_register(struct platform_device *pdev) +{ + struct lpass_data *drvdata = platform_get_drvdata(pdev); + struct lpass_variant *v = drvdata->variant; + int ret; + + drvdata->lpaif_irq = platform_get_irq_byname(pdev, "lpass-irq-lpaif"); + if (drvdata->lpaif_irq < 0) { + dev_err(&pdev->dev, "error getting irq handle: %d\n", + drvdata->lpaif_irq); + return -ENODEV; + } + + /* ensure audio hardware is disabled */ + ret = regmap_write(drvdata->lpaif_map, + LPAIF_IRQEN_REG(v, LPAIF_IRQ_PORT_HOST), 0); + if (ret) { + dev_err(&pdev->dev, "error writing to irqen reg: %d\n", ret); + return ret; + } + + ret = devm_request_irq(&pdev->dev, drvdata->lpaif_irq, + lpass_platform_lpaif_irq, IRQF_TRIGGER_RISING, + "lpass-irq-lpaif", drvdata); + if (ret) { + dev_err(&pdev->dev, "irq request failed: %d\n", ret); + return ret; + } + + + return devm_snd_soc_register_component(&pdev->dev, + &lpass_component_driver, NULL, 0); +} +EXPORT_SYMBOL_GPL(asoc_qcom_lpass_platform_register); + +MODULE_DESCRIPTION("QTi LPASS Platform Driver"); +MODULE_LICENSE("GPL v2"); |