dmaengine: omap-dma: move register read/writes into omap-dma.c

Export the DMA register information from the SoC specific data, such
that we can access the registers directly in omap-dma.c, mapping the
register region ourselves as well.

Rather than calculating the DMA channel register in its entirety for
each access, we pre-calculate an offset base address for the allocated
DMA channel and then just use the appropriate register offset.

Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-omap1/dma.c

@@ -261,9 +261,13 @@ static const struct platform_device_info omap_dma_dev_info = {
 	.name = "omap-dma-engine",
 	.id = -1,
 	.dma_mask = DMA_BIT_MASK(32),
+	.res = res,
+	.num_res = 1,
 };
 
 static struct omap_system_dma_plat_info dma_plat_info __initdata = {
+	.reg_map	= reg_map,
+	.channel_stride	= 0x40,
 	.show_dma_caps	= omap1_show_dma_caps,
 	.clear_lch_regs	= omap1_clear_lch_regs,
 	.clear_dma	= omap1_clear_dma,