On Thursday 02 January 2014 08:39 PM, Russell King wrote: > Program the transfer parameters directly into the hardware, rather > than using the functions in arch/arm/plat-omap/dma.c. > > Signed-off-by: Russell King <[email protected]> > --- > drivers/dma/omap-dma.c | 144 ++++++++++++++++++++++++++++++++++++++++----- > include/linux/omap-dma.h | 6 +- > 2 files changed, 132 insertions(+), 18 deletions(-) > > diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c > index 3c1bb34aad0a..dd233ca2cf5a 100644 > --- a/drivers/dma/omap-dma.c > +++ b/drivers/dma/omap-dma.c > @@ -99,16 +99,96 @@ static void omap_dma_start_sg(struct omap_chan *c, struct > omap_desc *d, > unsigned idx) > { > struct omap_sg *sg = d->sg + idx; > + uint32_t val; > + > + if (d->dir == DMA_DEV_TO_MEM) { > + if (dma_omap1()) { > + val = c->plat->dma_read(CSDP, c->dma_ch); > + val &= ~(0x1f << 9); > + val |= OMAP_DMA_PORT_EMIFF << 9; > + c->plat->dma_write(val, CSDP, c->dma_ch); > + } > > - if (d->dir == DMA_DEV_TO_MEM) > - omap_set_dma_dest_params(c->dma_ch, OMAP_DMA_PORT_EMIFF, > - OMAP_DMA_AMODE_POST_INC, sg->addr, 0, 0); > - else > - omap_set_dma_src_params(c->dma_ch, OMAP_DMA_PORT_EMIFF, > - OMAP_DMA_AMODE_POST_INC, sg->addr, 0, 0); > + val = c->plat->dma_read(CCR, c->dma_ch); > + val &= ~(0x03 << 14); > + val |= OMAP_DMA_AMODE_POST_INC << 14; > + c->plat->dma_write(val, CCR, c->dma_ch); > + > + c->plat->dma_write(sg->addr, CDSA, c->dma_ch); > + c->plat->dma_write(0, CDEI, c->dma_ch); > + c->plat->dma_write(0, CDFI, c->dma_ch); > + } else { > + if (dma_omap1()) { > + val = c->plat->dma_read(CSDP, c->dma_ch); > + val &= ~(0x1f << 2); > + val |= OMAP_DMA_PORT_EMIFF << 2; > + c->plat->dma_write(val, CSDP, c->dma_ch); > + } > + > + val = c->plat->dma_read(CCR, c->dma_ch); > + val &= ~(0x03 << 12); > + val |= OMAP_DMA_AMODE_POST_INC << 12; > + c->plat->dma_write(val, CCR, c->dma_ch); > + > + c->plat->dma_write(sg->addr, CSSA, c->dma_ch); > + c->plat->dma_write(0, CSEI, c->dma_ch); > + c->plat->dma_write(0, CSFI, c->dma_ch); > + } > + EI and FI are always set to zero. So interleaved transfers support have to enabled in omap-dma, as it was supported by the legacy driver. It was not enabled because of no users of the feature, right ?
Regards, Sricharan -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
