![Russell King](/assets/img/avatar_default.png)
This code sequence is unsafe in modules: static u64 mask = DMA_BIT_MASK(something); ... if (!dev->dma_mask) dev->dma_mask = &mask; as if a module is reloaded, the mask will be pointing at the original module's mask address, and this can lead to oopses. Moreover, they all follow this with: if (!dev->coherent_dma_mask) dev->coherent_dma_mask = mask; where 'mask' is the same value as the statically defined mask, and this bypasses the architecture's check on whether the DMA mask is possible. Fix these issues by using the new dma_coerce_coherent_and_mask() function. Acked-by: Mark Brown <broonie@linaro.org> Acked-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
365 lines
9.1 KiB
C
365 lines
9.1 KiB
C
/*
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* Copyright (c) 2010 Nuvoton technology corporation.
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*
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* Wan ZongShun <mcuos.com@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation;version 2 of the License.
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/dma-mapping.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <mach/hardware.h>
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#include "nuc900-audio.h"
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static const struct snd_pcm_hardware nuc900_pcm_hardware = {
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.info = SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_PAUSE |
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SNDRV_PCM_INFO_RESUME,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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.channels_min = 1,
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.channels_max = 2,
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.buffer_bytes_max = 4*1024,
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.period_bytes_min = 1*1024,
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.period_bytes_max = 4*1024,
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.periods_min = 1,
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.periods_max = 1024,
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};
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static int nuc900_dma_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct nuc900_audio *nuc900_audio = runtime->private_data;
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unsigned long flags;
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int ret = 0;
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ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
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if (ret < 0)
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return ret;
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spin_lock_irqsave(&nuc900_audio->lock, flags);
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nuc900_audio->substream = substream;
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nuc900_audio->dma_addr[substream->stream] = runtime->dma_addr;
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nuc900_audio->buffersize[substream->stream] =
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params_buffer_bytes(params);
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spin_unlock_irqrestore(&nuc900_audio->lock, flags);
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return ret;
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}
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static void nuc900_update_dma_register(struct snd_pcm_substream *substream,
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dma_addr_t dma_addr, size_t count)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct nuc900_audio *nuc900_audio = runtime->private_data;
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void __iomem *mmio_addr, *mmio_len;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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mmio_addr = nuc900_audio->mmio + ACTL_PDSTB;
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mmio_len = nuc900_audio->mmio + ACTL_PDST_LENGTH;
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} else {
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mmio_addr = nuc900_audio->mmio + ACTL_RDSTB;
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mmio_len = nuc900_audio->mmio + ACTL_RDST_LENGTH;
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}
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AUDIO_WRITE(mmio_addr, dma_addr);
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AUDIO_WRITE(mmio_len, count);
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}
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static void nuc900_dma_start(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct nuc900_audio *nuc900_audio = runtime->private_data;
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unsigned long val;
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val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
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val |= (T_DMA_IRQ | R_DMA_IRQ);
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AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
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}
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static void nuc900_dma_stop(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct nuc900_audio *nuc900_audio = runtime->private_data;
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unsigned long val;
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val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
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val &= ~(T_DMA_IRQ | R_DMA_IRQ);
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AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
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}
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static irqreturn_t nuc900_dma_interrupt(int irq, void *dev_id)
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{
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struct snd_pcm_substream *substream = dev_id;
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struct nuc900_audio *nuc900_audio = substream->runtime->private_data;
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unsigned long val;
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spin_lock(&nuc900_audio->lock);
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val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
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if (val & R_DMA_IRQ) {
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AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | R_DMA_IRQ);
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val = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
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if (val & R_DMA_MIDDLE_IRQ) {
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val |= R_DMA_MIDDLE_IRQ;
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AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
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}
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if (val & R_DMA_END_IRQ) {
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val |= R_DMA_END_IRQ;
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AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
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}
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} else if (val & T_DMA_IRQ) {
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AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | T_DMA_IRQ);
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val = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
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if (val & P_DMA_MIDDLE_IRQ) {
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val |= P_DMA_MIDDLE_IRQ;
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AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
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}
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if (val & P_DMA_END_IRQ) {
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val |= P_DMA_END_IRQ;
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AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
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}
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} else {
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dev_err(nuc900_audio->dev, "Wrong DMA interrupt status!\n");
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spin_unlock(&nuc900_audio->lock);
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return IRQ_HANDLED;
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}
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spin_unlock(&nuc900_audio->lock);
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snd_pcm_period_elapsed(substream);
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return IRQ_HANDLED;
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}
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static int nuc900_dma_hw_free(struct snd_pcm_substream *substream)
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{
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snd_pcm_lib_free_pages(substream);
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return 0;
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}
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static int nuc900_dma_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct nuc900_audio *nuc900_audio = runtime->private_data;
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unsigned long flags, val;
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int ret = 0;
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spin_lock_irqsave(&nuc900_audio->lock, flags);
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nuc900_update_dma_register(substream,
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nuc900_audio->dma_addr[substream->stream],
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nuc900_audio->buffersize[substream->stream]);
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val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
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switch (runtime->channels) {
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case 1:
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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val &= ~(PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
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val |= PLAY_RIGHT_CHNNEL;
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} else {
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val &= ~(RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
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val |= RECORD_RIGHT_CHNNEL;
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}
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AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
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break;
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case 2:
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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val |= (PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
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else
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val |= (RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
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AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
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break;
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default:
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ret = -EINVAL;
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}
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spin_unlock_irqrestore(&nuc900_audio->lock, flags);
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return ret;
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}
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static int nuc900_dma_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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int ret = 0;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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nuc900_dma_start(substream);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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nuc900_dma_stop(substream);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static int nuc900_dma_getposition(struct snd_pcm_substream *substream,
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dma_addr_t *src, dma_addr_t *dst)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct nuc900_audio *nuc900_audio = runtime->private_data;
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if (src != NULL)
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*src = AUDIO_READ(nuc900_audio->mmio + ACTL_PDSTC);
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if (dst != NULL)
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*dst = AUDIO_READ(nuc900_audio->mmio + ACTL_RDSTC);
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return 0;
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}
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static snd_pcm_uframes_t nuc900_dma_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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dma_addr_t src, dst;
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unsigned long res;
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nuc900_dma_getposition(substream, &src, &dst);
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if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
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res = dst - runtime->dma_addr;
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else
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res = src - runtime->dma_addr;
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return bytes_to_frames(substream->runtime, res);
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}
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static int nuc900_dma_open(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct nuc900_audio *nuc900_audio;
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snd_soc_set_runtime_hwparams(substream, &nuc900_pcm_hardware);
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nuc900_audio = nuc900_ac97_data;
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if (request_irq(nuc900_audio->irq_num, nuc900_dma_interrupt,
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0, "nuc900-dma", substream))
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return -EBUSY;
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runtime->private_data = nuc900_audio;
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return 0;
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}
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static int nuc900_dma_close(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct nuc900_audio *nuc900_audio = runtime->private_data;
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free_irq(nuc900_audio->irq_num, substream);
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return 0;
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}
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static int nuc900_dma_mmap(struct snd_pcm_substream *substream,
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struct vm_area_struct *vma)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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return dma_mmap_writecombine(substream->pcm->card->dev, vma,
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runtime->dma_area,
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runtime->dma_addr,
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runtime->dma_bytes);
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}
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static struct snd_pcm_ops nuc900_dma_ops = {
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.open = nuc900_dma_open,
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.close = nuc900_dma_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = nuc900_dma_hw_params,
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.hw_free = nuc900_dma_hw_free,
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.prepare = nuc900_dma_prepare,
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.trigger = nuc900_dma_trigger,
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.pointer = nuc900_dma_pointer,
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.mmap = nuc900_dma_mmap,
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};
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static void nuc900_dma_free_dma_buffers(struct snd_pcm *pcm)
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{
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snd_pcm_lib_preallocate_free_for_all(pcm);
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}
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static int nuc900_dma_new(struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_card *card = rtd->card->snd_card;
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struct snd_pcm *pcm = rtd->pcm;
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int ret;
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ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
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if (ret)
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return ret;
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snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
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card->dev, 4 * 1024, (4 * 1024) - 1);
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return 0;
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}
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static struct snd_soc_platform_driver nuc900_soc_platform = {
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.ops = &nuc900_dma_ops,
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.pcm_new = nuc900_dma_new,
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.pcm_free = nuc900_dma_free_dma_buffers,
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};
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static int nuc900_soc_platform_probe(struct platform_device *pdev)
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{
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return snd_soc_register_platform(&pdev->dev, &nuc900_soc_platform);
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}
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static int nuc900_soc_platform_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_platform(&pdev->dev);
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return 0;
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}
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static struct platform_driver nuc900_pcm_driver = {
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.driver = {
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.name = "nuc900-pcm-audio",
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.owner = THIS_MODULE,
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},
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.probe = nuc900_soc_platform_probe,
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.remove = nuc900_soc_platform_remove,
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};
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module_platform_driver(nuc900_pcm_driver);
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MODULE_AUTHOR("Wan ZongShun, <mcuos.com@gmail.com>");
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MODULE_DESCRIPTION("nuc900 Audio DMA module");
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MODULE_LICENSE("GPL");
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