From: Kenneth Westfield <kwestfie@xxxxxxxxxxxxxx>
Add platform driver for the Qualcomm Technologies
low-power audio subsystem (LPASS) ports.
Signed-off-by: Kenneth Westfield <kwestfie@xxxxxxxxxxxxxx>
Acked-by: Banajit Goswami <bgoswami@xxxxxxxxxxxxxx>
---
sound/soc/qcom/lpass-platform.c | 514 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 514 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..ce526119a2c4a38537e8c9777e0556f15e5a660f
--- /dev/null
+++ b/sound/soc/qcom/lpass-platform.c
@@ -0,0 +1,514 @@
+/*
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/io.h>
+#include <sound/soc.h>
+#include <sound/pcm_params.h>
+#include "lpass-lpaif-ipq806x.h"
+#include "lpass.h"
+
+#define DRV_NAME "lpass-platform"
+
+#define LPASS_PLATFORM_CHANNELS_MIN 1
+#define LPASS_PLATFORM_CHANNELS_MAX 8
+#define LPASS_PLATFORM_PERIODS_MIN 2
+#define LPASS_PLATFORM_PERIODS_MAX 2
+#define LPASS_PLATFORM_RATE_MIN 8000
+#define LPASS_PLATFORM_RATE_MAX 192000
+
+static struct snd_pcm_hardware lpass_platform_hardware = {
+ .info = 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 = LPASS_PLATFORM_RATE_MIN,
+ .rate_max = LPASS_PLATFORM_RATE_MAX,
+ .channels_min = LPASS_PLATFORM_CHANNELS_MIN,
+ .channels_max = LPASS_PLATFORM_CHANNELS_MAX,
+ .periods_min = LPASS_PLATFORM_PERIODS_MIN,
+ .periods_max = LPASS_PLATFORM_PERIODS_MAX,
+};
+
+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 lpass_data *drvdata =
+ snd_soc_platform_get_drvdata(soc_runtime->platform);
+ int ret;
+
+ lpass_platform_hardware.buffer_bytes_max = drvdata->lpm_size;
+ lpass_platform_hardware.period_bytes_max =
+ drvdata->lpm_size / LPASS_PLATFORM_PERIODS_MIN;
+ lpass_platform_hardware.period_bytes_min =
+ drvdata->lpm_size / LPASS_PLATFORM_PERIODS_MAX;
+ snd_soc_set_runtime_hwparams(substream, &lpass_platform_hardware);
+
+ runtime->dma_bytes = drvdata->lpm_size;
+
+ 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\n",
+ __func__);
+ return bitwidth;
+ }
+
+ regval = 0;
+ regval |= LPAIF_RDMACTL_BURSTEN_INCR4;
+ regval |= LPAIF_RDMACTL_AUDINTF_MI2S;
+ regval |= 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=%u, 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=%u, ch=%u\n",
+ __func__, bitwidth, channels);
+ return -EINVAL;
+ }
+ break;
+ default:
+ dev_err(soc_runtime->dev, "%s() invalid PCM config given: bw=%u, 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;
+ }
+
+ return 0;
+}
+
+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);
+ unsigned int reg, mask, val;
+ int ret;
+
+ reg = LPAIF_RDMABASE_REG(LPAIF_RDMA_CHAN_MI2S);
+ val = runtime->dma_addr;
+ ret = regmap_write(drvdata->lpaif_map, reg, val);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to rdmabase reg: %d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ reg = LPAIF_RDMABUFF_REG(LPAIF_RDMA_CHAN_MI2S);
+ val = (snd_pcm_lib_buffer_bytes(substream) >> 2) - 1;
+ ret = regmap_write(drvdata->lpaif_map, reg, val);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to rdmabuff reg: %d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ reg = LPAIF_RDMAPER_REG(LPAIF_RDMA_CHAN_MI2S);
+ val = (snd_pcm_lib_period_bytes(substream) >> 2) - 1;
+ ret = regmap_write(drvdata->lpaif_map, reg, val);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to rdmaper reg: %d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ reg = LPAIF_RDMACTL_REG(LPAIF_RDMA_CHAN_MI2S);
+ mask = LPAIF_RDMACTL_ENABLE_MASK;
+ val = LPAIF_RDMACTL_ENABLE_ON;
+ ret = regmap_update_bits(drvdata->lpaif_map, reg, mask, val);
+ 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);
+ unsigned int reg, mask, val;
+ 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 */
+ reg = LPAIF_IRQCLEAR_REG(LPAIF_IRQ_PORT_HOST);
+ val = LPAIF_IRQ_ALL(LPAIF_RDMA_CHAN_MI2S);
+ ret = regmap_write(drvdata->lpaif_map, reg, val);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to irqclear reg: %d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ reg = LPAIF_IRQEN_REG(LPAIF_IRQ_PORT_HOST);
+ mask = LPAIF_IRQ_ALL(LPAIF_RDMA_CHAN_MI2S);
+ val = LPAIF_IRQ_ALL(LPAIF_RDMA_CHAN_MI2S);
+ ret = regmap_update_bits(drvdata->lpaif_map, reg, mask, val);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to irqen reg: %d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ reg = LPAIF_RDMACTL_REG(LPAIF_RDMA_CHAN_MI2S);
+ mask = LPAIF_RDMACTL_ENABLE_MASK;
+ val = LPAIF_RDMACTL_ENABLE_ON;
+ ret = regmap_update_bits(drvdata->lpaif_map, reg, mask, val);
+ 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:
+ reg = LPAIF_RDMACTL_REG(LPAIF_RDMA_CHAN_MI2S);
+ mask = LPAIF_RDMACTL_ENABLE_MASK;
+ val = LPAIF_RDMACTL_ENABLE_OFF;
+ ret = regmap_update_bits(drvdata->lpaif_map, reg, mask, val);
+ if (ret) {
+ dev_err(soc_runtime->dev, "%s() error writing to rdmactl reg: %d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ reg = LPAIF_IRQEN_REG(LPAIF_IRQ_PORT_HOST);
+ mask = LPAIF_IRQ_ALL(LPAIF_RDMA_CHAN_MI2S);
+ val = 0;
+ ret = regmap_update_bits(drvdata->lpaif_map, reg, mask, val);
+ 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 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,
+};
+
+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);
+ const u32 status_offset = LPAIF_IRQSTAT_REG(LPAIF_IRQ_PORT_HOST);
+ const u32 clear_offset = LPAIF_IRQCLEAR_REG(LPAIF_IRQ_PORT_HOST);
+ const u32 period_bitmask = LPAIF_IRQ_PER(LPAIF_RDMA_CHAN_MI2S);
+ const u32 xrun_bitmask = LPAIF_IRQ_XRUN(LPAIF_RDMA_CHAN_MI2S);
+ const u32 error_bitmask = LPAIF_IRQ_ERR(LPAIF_RDMA_CHAN_MI2S);
+ const u32 chan_bitmask = LPAIF_IRQ_ALL(LPAIF_RDMA_CHAN_MI2S);
+ u32 interrupts;
+ irqreturn_t ret = IRQ_NONE;
+
+ interrupts = ioread32(drvdata->lpaif + status_offset) & chan_bitmask;
+
+ if (likely(interrupts & period_bitmask)) {
+ iowrite32(period_bitmask, drvdata->lpaif + clear_offset);
+ snd_pcm_period_elapsed(substream);
+ ret = IRQ_HANDLED;
+ }
+
+ if (unlikely(interrupts & xrun_bitmask)) {
+ iowrite32(xrun_bitmask, drvdata->lpaif + clear_offset);
+ dev_warn(soc_runtime->dev, "%s() xrun warning\n", __func__);
+ snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+ ret = IRQ_HANDLED;
+ }
+
+ if (unlikely(interrupts & error_bitmask)) {
+ iowrite32(error_bitmask, drvdata->lpaif + clear_offset);
+ 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;
+ struct lpass_data *drvdata =
+ snd_soc_platform_get_drvdata(soc_runtime->platform);
+
+ if (atomic_cmpxchg(&drvdata->lpm_lock, 0, 1)) {
+ dev_err(soc_runtime->dev, "%s() buffer already in use\n",
+ __func__);
+ return -ENOMEM;
+ }
+
+ buf->dev.type = SNDRV_DMA_TYPE_DEV;
+ buf->dev.dev = soc_runtime->dev;
+ buf->private_data = NULL;
+ buf->area = (unsigned char __force *)drvdata->lpm;
+ buf->addr = drvdata->lpm_phys;
+ buf->bytes = drvdata->lpm_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;
+ struct lpass_data *drvdata =
+ snd_soc_platform_get_drvdata(soc_runtime->platform);
+
+ if (buf->area == (unsigned char __force *)drvdata->lpm) {
+ buf->area = NULL;
+ atomic_dec(&drvdata->lpm_lock);
+ } else {
+ dev_warn(soc_runtime->dev, "%s() attempting to free invalid buffer\n",
+ __func__);
+ }
+}
+
+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;
+
+ 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);
+ struct resource *res;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lpass-lpm");
+ if (!res) {
+ dev_err(&pdev->dev, "%s() error getting resource\n", __func__);
+ return -ENODEV;
+ }
+
+ drvdata->lpm = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR((unsigned char __force *)drvdata->lpm)) {
+ dev_err(&pdev->dev, "%s() error mapping lpm resource: %ld\n",
+ __func__,
+ PTR_ERR((unsigned char __force *)drvdata->lpm));
+ return PTR_ERR((unsigned char __force *)drvdata->lpm);
+ }
+ drvdata->lpm_phys = res->start;
+ drvdata->lpm_size = resource_size(res);
+ atomic_set(&drvdata->lpm_lock, 0);
+
+ 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(asoc_qcom_lpass_platform_register);
+
+MODULE_DESCRIPTION("QTi LPASS Platform Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRV_NAME);
--
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