diff options
Diffstat (limited to 'drivers/media/pci/saa7134/saa7134-alsa.c')
| -rw-r--r-- | drivers/media/pci/saa7134/saa7134-alsa.c | 107 |
1 files changed, 92 insertions, 15 deletions
diff --git a/drivers/media/pci/saa7134/saa7134-alsa.c b/drivers/media/pci/saa7134/saa7134-alsa.c index e04a4d5..4056989 100644 --- a/drivers/media/pci/saa7134/saa7134-alsa.c +++ b/drivers/media/pci/saa7134/saa7134-alsa.c @@ -27,6 +27,7 @@ #include <sound/pcm_params.h> #include <sound/initval.h> #include <linux/interrupt.h> +#include <linux/vmalloc.h> #include "saa7134.h" #include "saa7134-reg.h" @@ -274,6 +275,82 @@ static int snd_card_saa7134_capture_trigger(struct snd_pcm_substream * substream return err; } +static int saa7134_alsa_dma_init(struct saa7134_dev *dev, int nr_pages) +{ + struct saa7134_dmasound *dma = &dev->dmasound; + struct page *pg; + int i; + + dma->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT); + if (NULL == dma->vaddr) { + dprintk("vmalloc_32(%d pages) failed\n", nr_pages); + return -ENOMEM; + } + + dprintk("vmalloc is at addr 0x%08lx, size=%d\n", + (unsigned long)dma->vaddr, + nr_pages << PAGE_SHIFT); + + memset(dma->vaddr, 0, nr_pages << PAGE_SHIFT); + dma->nr_pages = nr_pages; + + dma->sglist = vzalloc(dma->nr_pages * sizeof(*dma->sglist)); + if (NULL == dma->sglist) + goto vzalloc_err; + + sg_init_table(dma->sglist, dma->nr_pages); + for (i = 0; i < dma->nr_pages; i++) { + pg = vmalloc_to_page(dma->vaddr + i * PAGE_SIZE); + if (NULL == pg) + goto vmalloc_to_page_err; + sg_set_page(&dma->sglist[i], pg, PAGE_SIZE, 0); + } + return 0; + +vmalloc_to_page_err: + vfree(dma->sglist); + dma->sglist = NULL; +vzalloc_err: + vfree(dma->vaddr); + dma->vaddr = NULL; + return -ENOMEM; +} + +static int saa7134_alsa_dma_map(struct saa7134_dev *dev) +{ + struct saa7134_dmasound *dma = &dev->dmasound; + + dma->sglen = dma_map_sg(&dev->pci->dev, dma->sglist, + dma->nr_pages, PCI_DMA_FROMDEVICE); + + if (0 == dma->sglen) { + pr_warn("%s: saa7134_alsa_map_sg failed\n", __func__); + return -ENOMEM; + } + return 0; +} + +static int saa7134_alsa_dma_unmap(struct saa7134_dev *dev) +{ + struct saa7134_dmasound *dma = &dev->dmasound; + + if (!dma->sglen) + return 0; + + dma_unmap_sg(&dev->pci->dev, dma->sglist, dma->sglen, PCI_DMA_FROMDEVICE); + dma->sglen = 0; + return 0; +} + +static int saa7134_alsa_dma_free(struct saa7134_dmasound *dma) +{ + vfree(dma->sglist); + dma->sglist = NULL; + vfree(dma->vaddr); + dma->vaddr = NULL; + return 0; +} + /* * DMA buffer initialization * @@ -291,9 +368,8 @@ static int dsp_buffer_init(struct saa7134_dev *dev) BUG_ON(!dev->dmasound.bufsize); - videobuf_dma_init(&dev->dmasound.dma); - err = videobuf_dma_init_kernel(&dev->dmasound.dma, PCI_DMA_FROMDEVICE, - (dev->dmasound.bufsize + PAGE_SIZE) >> PAGE_SHIFT); + err = saa7134_alsa_dma_init(dev, + (dev->dmasound.bufsize + PAGE_SIZE) >> PAGE_SHIFT); if (0 != err) return err; return 0; @@ -310,7 +386,7 @@ static int dsp_buffer_free(struct saa7134_dev *dev) { BUG_ON(!dev->dmasound.blksize); - videobuf_dma_free(&dev->dmasound.dma); + saa7134_alsa_dma_free(&dev->dmasound); dev->dmasound.blocks = 0; dev->dmasound.blksize = 0; @@ -632,7 +708,7 @@ static int snd_card_saa7134_hw_params(struct snd_pcm_substream * substream, /* release the old buffer */ if (substream->runtime->dma_area) { saa7134_pgtable_free(dev->pci, &dev->dmasound.pt); - videobuf_dma_unmap(&dev->pci->dev, &dev->dmasound.dma); + saa7134_alsa_dma_unmap(dev); dsp_buffer_free(dev); substream->runtime->dma_area = NULL; } @@ -648,21 +724,22 @@ static int snd_card_saa7134_hw_params(struct snd_pcm_substream * substream, return err; } - if (0 != (err = videobuf_dma_map(&dev->pci->dev, &dev->dmasound.dma))) { + err = saa7134_alsa_dma_map(dev); + if (err) { dsp_buffer_free(dev); return err; } - if (0 != (err = saa7134_pgtable_alloc(dev->pci,&dev->dmasound.pt))) { - videobuf_dma_unmap(&dev->pci->dev, &dev->dmasound.dma); + err = saa7134_pgtable_alloc(dev->pci, &dev->dmasound.pt); + if (err) { + saa7134_alsa_dma_unmap(dev); dsp_buffer_free(dev); return err; } - if (0 != (err = saa7134_pgtable_build(dev->pci,&dev->dmasound.pt, - dev->dmasound.dma.sglist, - dev->dmasound.dma.sglen, - 0))) { + err = saa7134_pgtable_build(dev->pci, &dev->dmasound.pt, + dev->dmasound.sglist, dev->dmasound.sglen, 0); + if (err) { saa7134_pgtable_free(dev->pci, &dev->dmasound.pt); - videobuf_dma_unmap(&dev->pci->dev, &dev->dmasound.dma); + saa7134_alsa_dma_unmap(dev); dsp_buffer_free(dev); return err; } @@ -671,7 +748,7 @@ static int snd_card_saa7134_hw_params(struct snd_pcm_substream * substream, byte, but it doesn't work. So I allocate the DMA using the V4L functions, and force ALSA to use that as the DMA area */ - substream->runtime->dma_area = dev->dmasound.dma.vaddr; + substream->runtime->dma_area = dev->dmasound.vaddr; substream->runtime->dma_bytes = dev->dmasound.bufsize; substream->runtime->dma_addr = 0; @@ -698,7 +775,7 @@ static int snd_card_saa7134_hw_free(struct snd_pcm_substream * substream) if (substream->runtime->dma_area) { saa7134_pgtable_free(dev->pci, &dev->dmasound.pt); - videobuf_dma_unmap(&dev->pci->dev, &dev->dmasound.dma); + saa7134_alsa_dma_unmap(dev); dsp_buffer_free(dev); substream->runtime->dma_area = NULL; } |
