linux-imx
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committed 0b6a2c9cf4ax
static inline struct soundscape *get_card_soundscape(struct snd_card *c){ return (struct soundscape *) (c->private_data);}/* * Allocates some kernel memory that we can use for DMA. * I think this means that the memory has to map to * contiguous pages of physical memory. */static struct snd_dma_buffer *get_dmabuf(struct snd_dma_buffer *buf,static struct snd_dma_buffer *get_dmabuf(struct soundscape *s, struct snd_dma_buffer *buf, unsigned long size){ if (buf) { if (snd_dma_alloc_pages_fallback(SNDRV_DMA_TYPE_DEV, snd_dma_isa_data(), s->chip->card->dev, size, buf) < 0) { snd_printk(KERN_ERR "sscape: Failed to allocate " "%lu bytes for DMA\n", size); return NULL; } } return buf;} * Upload a byte-stream into the SoundScape using DMA channel A. */static int upload_dma_data(struct soundscape *s, const unsigned char *data, size_t size){ unsigned long flags; struct snd_dma_buffer dma; int ret; unsigned char val; if (!get_dmabuf(&dma, PAGE_ALIGN(32 * 1024))) if (!get_dmabuf(s, &dma, PAGE_ALIGN(32 * 1024))) return -ENOMEM; spin_lock_irqsave(&s->lock, flags); /* * Reset the board ... */ val = sscape_read_unsafe(s->io_base, GA_HMCTL_REG); sscape_write_unsafe(s->io_base, GA_HMCTL_REG, val & 0x3f);