/* * 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"); net-next.git/diff/sound/drivers/virmidi.c?h=nds-private-remove&id=c8f325a59cfc718d13a50fbc746ed9b415c25e92&id2=bf29bddf0417a4783da3b24e8c9e017ac649326f'>diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'sound/drivers/virmidi.c')