/* * imx-pcm-fiq.c -- ALSA Soc Audio Layer * * Copyright 2009 Sascha Hauer * * This code is based on code copyrighted by Freescale, * Liam Girdwood, Javier Martin and probably others. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "imx-ssi.h" struct imx_pcm_runtime_data { int period; int periods; unsigned long offset; unsigned long last_offset; unsigned long size; struct hrtimer hrt; int poll_time_ns; struct snd_pcm_substream *substream; atomic_t running; }; 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 snd_pcm_runtime *runtime = substream->runtime; struct pt_regs regs; unsigned long delta; if (!atomic_read(&iprtd->running)) 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; /* How much data have we transferred since the last period report? */ if (iprtd->offset >= iprtd->last_offset) delta = iprtd->offset - iprtd->last_offset; else delta = runtime->buffer_size + iprtd->offset - iprtd->last_offset; /* If we've transferred at least a period then report it and * reset our poll time */ if (delta >= iprtd->period) { snd_pcm_period_elapsed(substream); iprtd->last_offset = iprtd->offset; } 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->size = params_buffer_bytes(params); iprtd->periods = params_periods(params); iprtd->period = params_period_bytes(params) ; iprtd->offset = 0; iprtd->last_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 fiq_enable; 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: atomic_set(&iprtd->running, 1); hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns), HRTIMER_MODE_REL); if (++fiq_enable == 1) enable_fiq(imx_pcm_fiq); break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: atomic_set(&iprtd->running, 0); if (--fiq_enable == 0) 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 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, .rate_min = 8000, .channels_min = 2, .channels_max = 2, .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->running, 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 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 ssi_irq = 0; static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd) { struct snd_soc_dai *dai = rtd->cpu_dai; struct snd_pcm *pcm = rtd->pcm; int ret; ret = imx_pcm_new(rtd); if (ret) return ret; if (dai->driver->playback.channels_min) { struct snd_pcm_substream *substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; struct snd_dma_buffer *buf = &substream->dma_buffer; imx_ssi_fiq_tx_buffer = (unsigned long)buf->area; } if (dai->driver->capture.channels_min) { struct snd_pcm_substream *substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].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_fiq_free(struct snd_pcm *pcm) { mxc_set_irq_fiq(ssi_irq, 0); release_fiq(&fh); imx_pcm_free(pcm); } static struct snd_soc_platform_driver imx_soc_platform_fiq = { .ops = &imx_pcm_ops, .pcm_new = imx_pcm_fiq_new, .pcm_free = imx_pcm_fiq_free, }; static int __devinit imx_soc_platform_probe(struct platform_device *pdev) { struct imx_ssi *ssi = platform_get_drvdata(pdev); int ret; ret = claim_fiq(&fh); if (ret) { dev_err(&pdev->dev, "failed to claim fiq: %d", ret); return ret; } mxc_set_irq_fiq(ssi->irq, 1); ssi_irq = ssi->irq; imx_pcm_fiq = ssi->irq; imx_ssi_fiq_base = (unsigned long)ssi->base; ssi->dma_params_tx.burstsize = 4; ssi->dma_params_rx.burstsize = 6; ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq); if (ret) goto failed_register; return 0; failed_register: mxc_set_irq_fiq(ssi_irq, 0); release_fiq(&fh); return ret; } static int __devexit imx_soc_platform_remove(struct platform_device *pdev) { snd_soc_unregister_platform(&pdev->dev); return 0; } static struct platform_driver imx_pcm_driver = { .driver = { .name = "imx-fiq-pcm-audio", .owner = THIS_MODULE, }, .probe = imx_soc_platform_probe, .remove = __devexit_p(imx_soc_platform_remove), }; static int __init snd_imx_pcm_init(void) { return platform_driver_register(&imx_pcm_driver); } module_init(snd_imx_pcm_init); static void __exit snd_imx_pcm_exit(void) { platform_driver_unregister(&imx_pcm_driver); } module_exit(snd_imx_pcm_exit);