/* * linux/sound/soc/pxa/mmp-pcm.c * * Copyright (C) 2011 Marvell International Ltd. * * 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 struct mmp_dma_data { int ssp_id; struct resource *dma_res; }; #define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP | \ SNDRV_PCM_INFO_MMAP_VALID | \ SNDRV_PCM_INFO_INTERLEAVED | \ SNDRV_PCM_INFO_PAUSE | \ SNDRV_PCM_INFO_RESUME | \ SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) static struct snd_pcm_hardware mmp_pcm_hardware[] = { { .info = MMP_PCM_INFO, .period_bytes_min = 1024, .period_bytes_max = 2048, .periods_min = 2, .periods_max = 32, .buffer_bytes_max = 4096, .fifo_size = 32, }, { .info = MMP_PCM_INFO, .period_bytes_min = 1024, .period_bytes_max = 2048, .periods_min = 2, .periods_max = 32, .buffer_bytes_max = 4096, .fifo_size = 32, }, }; static int mmp_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream); struct dma_slave_config slave_config; int ret; ret = snd_dmaengine_pcm_prepare_slave_config(substream, params, &slave_config); if (ret) return ret; ret = dmaengine_slave_config(chan, &slave_config); if (ret) return ret; snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); return 0; } static bool filter(struct dma_chan *chan, void *param) { struct mmp_dma_data *dma_data = param; bool found = false; char *devname; devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name, dma_data->ssp_id); if ((strcmp(dev_name(chan->device->dev), devname) == 0) && (chan->chan_id == dma_data->dma_res->start)) { found = true; } kfree(devname); return found; } static int mmp_pcm_open(struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct platform_device *pdev = to_platform_device(rtd->platform->dev); struct snd_soc_dai *cpu_dai = rtd->cpu_dai; struct mmp_dma_data dma_data; struct resource *r; r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream); if (!r) return -EBUSY; snd_soc_set_runtime_hwparams(substream, &mmp_pcm_hardware[substream->stream]); dma_data.dma_res = r; dma_data.ssp_id = cpu_dai->id; return snd_dmaengine_pcm_open_request_chan(substream, filter, &dma_data); } static int mmp_pcm_mmap(struct snd_pcm_substream *substream, struct vm_area_struct *vma) { struct snd_pcm_runtime *runtime = substream->runtime; unsigned long off = vma->vm_pgoff; vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); return remap_pfn_range(vma, vma->vm_start, __phys_to_pfn(runtime->dma_addr) + off, vma->vm_end - vma->vm_start, vma->vm_page_prot); } static struct snd_pcm_ops mmp_pcm_ops = { .open = mmp_pcm_open, .close = snd_dmaengine_pcm_close_release_chan, .ioctl = snd_pcm_lib_ioctl, .hw_params = mmp_pcm_hw_params, .trigger = snd_dmaengine_pcm_trigger, .pointer = snd_dmaengine_pcm_pointer, .mmap = mmp_pcm_mmap, }; static void mmp_pcm_free_dma_buffers(struct snd_pcm *pcm) { struct snd_pcm_substream *substream; struct snd_dma_buffer *buf; int stream; struct gen_pool *gpool; gpool = sram_get_gpool("asram"); if (!gpool) return; for (stream = 0; stream < 2; stream++) { size_t size = mmp_pcm_hardware[stream].buffer_bytes_max; substream = pcm->streams[stream].substream; if (!substream) continue; buf = &substream->dma_buffer; if (!buf->area) continue; gen_pool_free(gpool, (unsigned long)buf->area, size); buf->area = NULL; } return; } static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream, int stream) { struct snd_dma_buffer *buf = &substream->dma_buffer; size_t size = mmp_pcm_hardware[stream].buffer_bytes_max; struct gen_pool *gpool; buf->dev.type = SNDRV_DMA_TYPE_DEV; buf->dev.dev = substream->pcm->card->dev; buf->private_data = NULL; gpool = sram_get_gpool("asram"); if (!gpool) return -ENOMEM; buf->area = gen_pool_dma_alloc(gpool, size, &buf->addr); if (!buf->area) return -ENOMEM; buf->bytes = size; return 0; } static int mmp_pcm_new(struct snd_soc_pcm_runtime *rtd) { struct snd_pcm_substream *substream; struct snd_pcm *pcm = rtd->pcm; int ret = 0, stream; for (stream = 0; stream < 2; stream++) { substream = pcm->streams[stream].substream; ret = mmp_pcm_preallocate_dma_buffer(substream, stream); if (ret) goto err; } return 0; err: mmp_pcm_free_dma_buffers(pcm); return ret; } static struct snd_soc_platform_driver mmp_soc_platform = { .ops = &mmp_pcm_ops, .pcm_new = mmp_pcm_new, .pcm_free = mmp_pcm_free_dma_buffers, }; static int mmp_pcm_probe(struct platform_device *pdev) { struct mmp_audio_platdata *pdata = pdev->dev.platform_data; if (pdata) { mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max = pdata->buffer_max_playback; mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max = pdata->period_max_playback; mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max = pdata->buffer_max_capture; mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max = pdata->period_max_capture; } return devm_snd_soc_register_platform(&pdev->dev, &mmp_soc_platform); } static struct platform_driver mmp_pcm_driver = { .driver = { .name = "mmp-pcm-audio", }, .probe = mmp_pcm_probe, }; module_platform_driver(mmp_pcm_driver); MODULE_AUTHOR("Leo Yan "); MODULE_DESCRIPTION("MMP Soc Audio DMA module"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:mmp-pcm-audio"); ible it clears all the protection bits but leave the PTE valid. With the Radix MMU, an attempt at executing from such a PTE will take a fault with bit 35 of SRR1 set "SRR1_ISI_N_OR_G". It is thus incorrect to treat all such faults as errors. We should pass them to handle_mm_fault() for autonuma to deal with. The case of pages that are really not executable is handled by the existing test for VM_EXEC further down. That leaves us with catching the kernel attempts at executing user pages. We can catch that earlier, even before we do find_vma. It is never valid on powerpc for the kernel to take an exec fault to begin with. So fold that test with the existing test for the kernel faulting on kernel addresses to bail out early. Fixes: 1d18ad026844 ("powerpc/mm: Detect instruction fetch denied and report") Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'sound/soc/fsl/p1022_rdk.c')