From: Kenneth Westfield <kwest...@codeaurora.org>
Add platform driver for the Qualcomm Technologies
low-power audio subsystem (LPASS) ports.
Signed-off-by: Kenneth Westfield <kwest...@codeaurora.org>
Acked-by: Banajit Goswami <bgosw...@codeaurora.org>
---
sound/soc/qcom/lpass-platform.c | 526 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 526 insertions(+)
create mode 100644 sound/soc/qcom/lpass-platform.c
diff --git a/sound/soc/qcom/lpass-platform.c b/sound/soc/qcom/lpass-platform.c
new file mode 100644
index
0000000000000000000000000000000000000000..2fa6280dfb234b213904ad73dfad91c7f575538c
--- /dev/null
+++ b/sound/soc/qcom/lpass-platform.c
@@ -0,0 +1,526 @@
+/*
+ * 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/compiler.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <sound/memalloc.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <linux/regmap.h>
+#include <sound/soc.h>
+#include "lpass-lpaif-ipq806x.h"
+#include "lpass.h"
+
+#define LPASS_PLATFORM_BUFFER_SIZE (16 * 1024)
+#define LPASS_PLATFORM_PERIODS 2
+
+static 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;
+ int ret;
+
+ 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) {
+ dev_err(soc_runtime->dev, "%s() setting constraints failed:
%d\n",
+ __func__, ret);
+ return -EINVAL;
+ }
+
+ snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+
+ 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 lpass_data *drvdata =
+ snd_soc_platform_get_drvdata(soc_runtime->platform);
+ snd_pcm_format_t format = params_format(params);
+ unsigned int channels = params_channels(params);
+ unsigned int regval;
+ int bitwidth;
+ int ret;
+
+ bitwidth = snd_pcm_format_width(format);
+ if (bitwidth < 0) {
+ dev_err(soc_runtime->dev, "%s() invalid bit width given: %d\n",
+ __func__, bitwidth);
+ return bitwidth;
+ }
+
+ regval = LPAIF_RDMACTL_BURSTEN_INCR4 |
+ LPAIF_RDMACTL_AUDINTF_MI2S |
+ LPAIF_RDMACTL_FIFOWM_8;
+
+ switch (bitwidth) {
+ case 16:
+ switch (channels) {
+ case 1:
+ case 2:
+ regval |= LPAIF_RDMACTL_WPSCNT_ONE;
+ break;
+ case 4:
+ regval |= LPAIF_RDMACTL_WPSCNT_TWO;
+ break;
+ case 6:
+ regval |= LPAIF_RDMACTL_WPSCNT_THREE;
+ break;
+ case 8:
+ regval |= LPAIF_RDMACTL_WPSCNT_FOUR;
+ break;
+ default:
+ dev_err(soc_runtime->dev, "%s() invalid PCM config
given: bw=%d, ch=%u\n",
+ __func__, bitwidth, channels);
+ return -EINVAL;
+ }
+ break;
+ case 24:
+ case 32:
+ switch (channels) {
+ case 1:
+ regval |= LPAIF_RDMACTL_WPSCNT_ONE;
+ break;
+ case 2:
+ regval |= LPAIF_RDMACTL_WPSCNT_TWO;
+ break;
+ case 4:
+ regval |= LPAIF_RDMACTL_WPSCNT_FOUR;
+ break;
+ case 6:
+ regval |= LPAIF_RDMACTL_WPSCNT_SIX;
+ break;
+ case 8:
+ regval |= LPAIF_RDMACTL_WPSCNT_EIGHT;
+ break;
+ default:
+ dev_err(soc_runtime->dev, "%s() invalid PCM config
given: bw=%d, ch=%u\n",
+ __func__, bitwidth, channels);
+ return -EINVAL;
+ }
+ break;
+ default:
+ dev_err(soc_runtime->dev, "%s() invalid PCM config given:
bw=%d, ch=%u\n",
+ __func__, bitwidth, channels);
+ return -EINVAL;
+ }
+
+ ret = regmap_write(drvdata->lpaif_map,
+ LPAIF_RDMACTL_REG(LPAIF_RDMA_CHAN_MI2S), regval);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to rdmactl reg:
%d\n",
+ __func__, 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 lpass_data *drvdata =
+ snd_soc_platform_get_drvdata(soc_runtime->platform);
+ int ret;
+
+ ret = regmap_write(drvdata->lpaif_map,
+ LPAIF_RDMACTL_REG(LPAIF_RDMA_CHAN_MI2S), 0);
+ if (ret)
+ dev_err(soc_runtime->dev, "%s() error writing to rdmactl reg:
%d\n",
+ __func__, 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 lpass_data *drvdata =
+ snd_soc_platform_get_drvdata(soc_runtime->platform);
+ int ret;
+
+ ret = regmap_write(drvdata->lpaif_map,
+ LPAIF_RDMABASE_REG(LPAIF_RDMA_CHAN_MI2S),
+ runtime->dma_addr);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to rdmabase reg:
%d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ ret = regmap_write(drvdata->lpaif_map,
+ LPAIF_RDMABUFF_REG(LPAIF_RDMA_CHAN_MI2S),
+ (snd_pcm_lib_buffer_bytes(substream) >> 2) - 1);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to rdmabuff reg:
%d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ ret = regmap_write(drvdata->lpaif_map,
+ LPAIF_RDMAPER_REG(LPAIF_RDMA_CHAN_MI2S),
+ (snd_pcm_lib_period_bytes(substream) >> 2) - 1);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to rdmaper reg:
%d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ ret = regmap_update_bits(drvdata->lpaif_map,
+ LPAIF_RDMACTL_REG(LPAIF_RDMA_CHAN_MI2S),
+ LPAIF_RDMACTL_ENABLE_MASK, LPAIF_RDMACTL_ENABLE_ON);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to rdmactl reg:
%d\n",
+ __func__, 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 lpass_data *drvdata =
+ snd_soc_platform_get_drvdata(soc_runtime->platform);
+ int ret;
+
+ 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(LPAIF_IRQ_PORT_HOST),
+ LPAIF_IRQ_ALL(LPAIF_RDMA_CHAN_MI2S));
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to
irqclear reg: %d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ ret = regmap_update_bits(drvdata->lpaif_map,
+ LPAIF_IRQEN_REG(LPAIF_IRQ_PORT_HOST),
+ LPAIF_IRQ_ALL(LPAIF_RDMA_CHAN_MI2S),
+ LPAIF_IRQ_ALL(LPAIF_RDMA_CHAN_MI2S));
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to irqen
reg: %d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ ret = regmap_update_bits(drvdata->lpaif_map,
+ LPAIF_RDMACTL_REG(LPAIF_RDMA_CHAN_MI2S),
+ LPAIF_RDMACTL_ENABLE_MASK,
+ LPAIF_RDMACTL_ENABLE_ON);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to
rdmactl reg: %d\n",
+ __func__, 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_RDMACTL_REG(LPAIF_RDMA_CHAN_MI2S),
+ LPAIF_RDMACTL_ENABLE_MASK,
+ LPAIF_RDMACTL_ENABLE_OFF);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to
rdmactl reg: %d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ ret = regmap_update_bits(drvdata->lpaif_map,
+ LPAIF_IRQEN_REG(LPAIF_IRQ_PORT_HOST),
+ LPAIF_IRQ_ALL(LPAIF_RDMA_CHAN_MI2S), 0);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to irqen
reg: %d\n",
+ __func__, 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 lpass_data *drvdata =
+ snd_soc_platform_get_drvdata(soc_runtime->platform);
+ unsigned int base_addr, curr_addr;
+ int ret;
+
+ ret = regmap_read(drvdata->lpaif_map,
+ LPAIF_RDMABASE_REG(LPAIF_RDMA_CHAN_MI2S), &base_addr);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error reading from rdmabase
reg: %d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ ret = regmap_read(drvdata->lpaif_map,
+ LPAIF_RDMACURR_REG(LPAIF_RDMA_CHAN_MI2S), &curr_addr);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error reading from rdmacurr
reg: %d\n",
+ __func__, 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 struct snd_pcm_ops lpass_platform_pcm_ops = {
+ .open = lpass_platform_pcmops_open,
+ .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_platform_lpaif_irq(int irq, void *data)
+{
+ struct snd_pcm_substream *substream = data;
+ struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+ struct lpass_data *drvdata =
+ snd_soc_platform_get_drvdata(soc_runtime->platform);
+ unsigned int interrupts;
+ irqreturn_t ret = IRQ_NONE;
+ int rv;
+
+ rv = regmap_read(drvdata->lpaif_map,
+ LPAIF_IRQSTAT_REG(LPAIF_IRQ_PORT_HOST), &interrupts);
+ if (rv) {
+ dev_err(soc_runtime->dev, "%s() error reading from irqstat reg:
%d\n",
+ __func__, rv);
+ return IRQ_NONE;
+ }
+ interrupts &= LPAIF_IRQ_ALL(LPAIF_RDMA_CHAN_MI2S);
+
+ if (interrupts & LPAIF_IRQ_PER(LPAIF_RDMA_CHAN_MI2S)) {
+ rv = regmap_write(drvdata->lpaif_map,
+ LPAIF_IRQCLEAR_REG(LPAIF_IRQ_PORT_HOST),
+ LPAIF_IRQ_PER(LPAIF_RDMA_CHAN_MI2S));
+ if (rv) {
+ dev_err(soc_runtime->dev, "%s() error writing to
irqclear reg: %d\n",
+ __func__, rv);
+ return IRQ_NONE;
+ }
+ snd_pcm_period_elapsed(substream);
+ ret = IRQ_HANDLED;
+ }
+
+ if (interrupts & LPAIF_IRQ_XRUN(LPAIF_RDMA_CHAN_MI2S)) {
+ rv = regmap_write(drvdata->lpaif_map,
+ LPAIF_IRQCLEAR_REG(LPAIF_IRQ_PORT_HOST),
+ LPAIF_IRQ_XRUN(LPAIF_RDMA_CHAN_MI2S));
+ if (rv) {
+ dev_err(soc_runtime->dev, "%s() error writing to
irqclear reg: %d\n",
+ __func__, rv);
+ return IRQ_NONE;
+ }
+ dev_warn(soc_runtime->dev, "%s() xrun warning\n", __func__);
+ snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+ ret = IRQ_HANDLED;
+ }
+
+ if (interrupts & LPAIF_IRQ_ERR(LPAIF_RDMA_CHAN_MI2S)) {
+ rv = regmap_write(drvdata->lpaif_map,
+ LPAIF_IRQCLEAR_REG(LPAIF_IRQ_PORT_HOST),
+ LPAIF_IRQ_ERR(LPAIF_RDMA_CHAN_MI2S));
+ if (rv) {
+ dev_err(soc_runtime->dev, "%s() error writing to
irqclear reg: %d\n",
+ __func__, rv);
+ return IRQ_NONE;
+ }
+ dev_err(soc_runtime->dev, "%s() bus access error\n", __func__);
+ snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
+ ret = IRQ_HANDLED;
+ }
+
+ return ret;
+}
+
+static int lpass_platform_alloc_buffer(struct snd_pcm_substream *substream,
+ struct snd_soc_pcm_runtime *soc_runtime)
+{
+ struct snd_dma_buffer *buf = &substream->dma_buffer;
+ size_t size = lpass_platform_pcm_hardware.buffer_bytes_max;
+
+ buf->dev.type = SNDRV_DMA_TYPE_DEV;
+ buf->dev.dev = soc_runtime->dev;
+ buf->private_data = NULL;
+ buf->area = dma_alloc_coherent(soc_runtime->dev, size, &buf->addr,
+ GFP_KERNEL);
+ if (!buf->area) {
+ dev_err(soc_runtime->dev, "%s: Could not allocate DMA buffer\n",
+ __func__);
+ return -ENOMEM;
+ }
+ buf->bytes = size;
+
+ return 0;
+}
+
+static void lpass_platform_free_buffer(struct snd_pcm_substream *substream,
+ struct snd_soc_pcm_runtime *soc_runtime)
+{
+ struct snd_dma_buffer *buf = &substream->dma_buffer;
+
+ if (buf->area) {
+ dma_free_coherent(soc_runtime->dev, buf->bytes, buf->area,
+ buf->addr);
+ }
+ buf->area = NULL;
+}
+
+static int lpass_platform_pcm_new(struct snd_soc_pcm_runtime *soc_runtime)
+{
+ struct snd_pcm *pcm = soc_runtime->pcm;
+ struct snd_pcm_substream *substream =
+ pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
+ struct lpass_data *drvdata =
+ snd_soc_platform_get_drvdata(soc_runtime->platform);
+ int ret;
+
+ soc_runtime->dev->coherent_dma_mask = DMA_BIT_MASK(32);
+ soc_runtime->dev->dma_mask = &soc_runtime->dev->coherent_dma_mask;
+
+ ret = lpass_platform_alloc_buffer(substream, soc_runtime);
+ if (ret)
+ return ret;
+
+ ret = devm_request_irq(soc_runtime->dev, drvdata->lpaif_irq,
+ lpass_platform_lpaif_irq, IRQF_TRIGGER_RISING,
+ "lpass-irq-lpaif", substream);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() irq request failed: %d\n",
+ __func__, ret);
+ goto err_buf;
+ }
+
+ /* ensure audio hardware is disabled */
+ ret = regmap_write(drvdata->lpaif_map,
+ LPAIF_IRQEN_REG(LPAIF_IRQ_PORT_HOST), 0);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to irqen reg:
%d\n",
+ __func__, ret);
+ return ret;
+ }
+ ret = regmap_write(drvdata->lpaif_map,
+ LPAIF_RDMACTL_REG(LPAIF_RDMA_CHAN_MI2S), 0);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to rdmactl reg:
%d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ return 0;
+
+err_buf:
+ lpass_platform_free_buffer(substream, soc_runtime);
+ return ret;
+}
+
+static void lpass_platform_pcm_free(struct snd_pcm *pcm)
+{
+ struct snd_pcm_substream *substream =
+ pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
+ struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+
+ lpass_platform_free_buffer(substream, soc_runtime);
+}
+
+static struct snd_soc_platform_driver lpass_platform_driver = {
+ .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);
+
+ drvdata->lpaif_irq = platform_get_irq_byname(pdev, "lpass-irq-lpaif");
+ if (drvdata->lpaif_irq < 0) {
+ dev_err(&pdev->dev, "%s() error getting irq handle: %d\n",
+ __func__, drvdata->lpaif_irq);
+ return -ENODEV;
+ }
+
+ return devm_snd_soc_register_platform(&pdev->dev,
+ &lpass_platform_driver);
+}
+EXPORT_SYMBOL_GPL(asoc_qcom_lpass_platform_register);
+
+MODULE_DESCRIPTION("QTi LPASS Platform Driver");
+MODULE_LICENSE("GPL v2");
--
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