ARM: OMAP2+: Configure sdma capabilities directly

Only earlier SoCs need to be checked for this, all SoCs starting with
omap3630 have CCDN register. This way we get closer to removing the need
to ioremap sdma registers in the platform code.

Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Vinod Koul <vkoul@kernel.org>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Tested-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/dma.c

@@ -273,10 +273,10 @@ static int __init omap2_system_dma_init_dev(struct omap_hwmod *oh, void *unused)
 		d->dev_caps |= HS_CHANNELS_RESERVED;
 
 	/* Check the capabilities register for descriptor loading feature */
-	if (dma_read(CAPS_0, 0) & DMA_HAS_DESCRIPTOR_CAPS)
-		dma_common_ch_end = CCDN;
-	else
+	if (soc_is_omap24xx() || soc_is_omap34xx() || soc_is_am35xx())
 		dma_common_ch_end = CCFN;
+	else
+		dma_common_ch_end = CCDN;
 
 	return 0;
 }