// SPDX-License-Identifier: GPL-2.0+ // imx-pcm-fiq.c -- ALSA Soc Audio Layer // // Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de> // // This code is based on code copyrighted by Freescale, // Liam Girdwood, Javier Martin and probably others. #include <linux/clk.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/dma-mapping.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <sound/core.h> #include <sound/dmaengine_pcm.h> #include <sound/initval.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/soc.h> #include <asm/fiq.h> #include <linux/platform_data/asoc-imx-ssi.h> #include "imx-ssi.h" #include "imx-pcm.h" struct imx_pcm_runtime_data { unsigned int period; int periods; unsigned long offset; struct hrtimer hrt; int poll_time_ns; struct snd_pcm_substream *substream; atomic_t playing; atomic_t capturing; }; static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt) { struct imx_pcm_runtime_data *iprtd = container_of(hrt, struct imx_pcm_runtime_data, hrt); struct snd_pcm_substream *substream = iprtd->substream; struct pt_regs regs; if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing)) return HRTIMER_NORESTART; get_fiq_regs(®s); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) iprtd->offset = regs.ARM_r8 & 0xffff; else iprtd->offset = regs.ARM_r9 & 0xffff; snd_pcm_period_elapsed(substream); hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns)); return HRTIMER_RESTART; } static struct fiq_handler fh = { .name = DRV_NAME, }; static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct snd_pcm_runtime *runtime = substream->runtime; struct imx_pcm_runtime_data *iprtd = runtime->private_data; iprtd->periods = params_periods(params); iprtd->period = params_period_bytes(params); iprtd->offset = 0; iprtd->poll_time_ns = 1000000000 / params_rate(params) * params_period_size(params); snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); return 0; } static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct imx_pcm_runtime_data *iprtd = runtime->private_data; struct pt_regs regs; get_fiq_regs(®s); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16; else regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16; set_fiq_regs(®s); return 0; } static int imx_pcm_fiq; static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) { struct snd_pcm_runtime *runtime = substream->runtime; struct imx_pcm_runtime_data *iprtd = runtime->private_data; switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) atomic_set(&iprtd->playing, 1); else atomic_set(&iprtd->capturing, 1); hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns), HRTIMER_MODE_REL); enable_fiq(imx_pcm_fiq); break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) atomic_set(&iprtd->playing, 0); else atomic_set(&iprtd->capturing, 0); if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing)) disable_fiq(imx_pcm_fiq); break; default: return -EINVAL; } return 0; } static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct imx_pcm_runtime_data *iprtd = runtime->private_data; return bytes_to_frames(substream->runtime, iprtd->offset); } static const struct snd_pcm_hardware snd_imx_hardware = { .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME, .formats = SNDRV_PCM_FMTBIT_S16_LE, .buffer_bytes_max = IMX_SSI_DMABUF_SIZE, .period_bytes_min = 128, .period_bytes_max = 16 * 1024, .periods_min = 4, .periods_max = 255, .fifo_size = 0, }; static int snd_imx_open(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct imx_pcm_runtime_data *iprtd; int ret; iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL); if (iprtd == NULL) return -ENOMEM; runtime->private_data = iprtd; iprtd->substream = substream; atomic_set(&iprtd->playing, 0); atomic_set(&iprtd->capturing, 0); hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); iprtd->hrt.function = snd_hrtimer_callback; ret = snd_pcm_hw_constraint_integer(substream->runtime, SNDRV_PCM_HW_PARAM_PERIODS); if (ret < 0) { kfree(iprtd); return ret; } snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); return 0; } static int snd_imx_close(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct imx_pcm_runtime_data *iprtd = runtime->private_data; hrtimer_cancel(&iprtd->hrt); kfree(iprtd); return 0; } static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream, struct vm_area_struct *vma) { struct snd_pcm_runtime *runtime = substream->runtime; int ret; ret = dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area, runtime->dma_addr, runtime->dma_bytes); pr_debug("%s: ret: %d %p %pad 0x%08zx\n", __func__, ret, runtime->dma_area, &runtime->dma_addr, runtime->dma_bytes); return ret; } static const struct snd_pcm_ops imx_pcm_ops = { .open = snd_imx_open, .close = snd_imx_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = snd_imx_pcm_hw_params, .prepare = snd_imx_pcm_prepare, .trigger = snd_imx_pcm_trigger, .pointer = snd_imx_pcm_pointer, .mmap = snd_imx_pcm_mmap, }; static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) { struct snd_pcm_substream *substream = pcm->streams[stream].substream; struct snd_dma_buffer *buf = &substream->dma_buffer; size_t size = IMX_SSI_DMABUF_SIZE; buf->dev.type = SNDRV_DMA_TYPE_DEV; buf->dev.dev = pcm->card->dev; buf->private_data = NULL; buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL); if (!buf->area) return -ENOMEM; buf->bytes = size; return 0; } static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd) { struct snd_card *card = rtd->card->snd_card; struct snd_pcm *pcm = rtd->pcm; int ret; ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); if (ret) return ret; if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { ret = imx_pcm_preallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK); if (ret) return ret; } if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { ret = imx_pcm_preallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE); if (ret) return ret; } return 0; } static int ssi_irq; static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd) { struct snd_pcm *pcm = rtd->pcm; struct snd_pcm_substream *substream; int ret; ret = imx_pcm_new(rtd); if (ret) return ret; substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; if (substream) { struct snd_dma_buffer *buf = &substream->dma_buffer; imx_ssi_fiq_tx_buffer = (unsigned long)buf->area; } substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; if (substream) { struct snd_dma_buffer *buf = &substream->dma_buffer; imx_ssi_fiq_rx_buffer = (unsigned long)buf->area; } set_fiq_handler(&imx_ssi_fiq_start, &imx_ssi_fiq_end - &imx_ssi_fiq_start); return 0; } static void imx_pcm_free(struct snd_pcm *pcm) { struct snd_pcm_substream *substream; struct snd_dma_buffer *buf; int stream; for (stream = 0; stream < 2; stream++) { substream = pcm->streams[stream].substream; if (!substream) continue; buf = &substream->dma_buffer; if (!buf->area) continue; dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr); buf->area = NULL; } } static void imx_pcm_fiq_free(struct snd_pcm *pcm) { mxc_set_irq_fiq(ssi_irq, 0); release_fiq(&fh); imx_pcm_free(pcm); } static const struct snd_soc_component_driver imx_soc_component_fiq = { .ops = &imx_pcm_ops, .pcm_new = imx_pcm_fiq_new, .pcm_free = imx_pcm_fiq_free, }; int imx_pcm_fiq_init(struct platform_device *pdev, struct imx_pcm_fiq_params *params) { int ret; ret = claim_fiq(&fh); if (ret) { dev_err(&pdev->dev, "failed to claim fiq: %d", ret); return ret; } mxc_set_irq_fiq(params->irq, 1); ssi_irq = params->irq; imx_pcm_fiq = params->irq; imx_ssi_fiq_base = (unsigned long)params->base; params->dma_params_tx->maxburst = 4; params->dma_params_rx->maxburst = 6; ret = devm_snd_soc_register_component(&pdev->dev, &imx_soc_component_fiq, NULL, 0); if (ret) goto failed_register; return 0; failed_register: mxc_set_irq_fiq(ssi_irq, 0); release_fiq(&fh); return ret; } EXPORT_SYMBOL_GPL(imx_pcm_fiq_init); void imx_pcm_fiq_exit(struct platform_device *pdev) { } EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit); MODULE_LICENSE("GPL");