dmaengine: ti: omap-dma: Add device tree match data and use it for cpu_pm

With old DMA code disabled for handling DMA requests for device tree based
SoCs, we can move omap3 specific context save and restore to the dmaengine
driver.

Let's do this by adding cpu_pm notifier handling to save and restore context,
and enable it based on device tree match data. This way we can use the match
data later to configure more SoC specific features later on too.

Note that we only clear the channels in use while the platform code also
clears reserved channels 0 and 1 on high-security SoCs. Based on testing
on n900, this is not needed though and the system idles just fine.

With the dmaengine driver handling context save and restore, we must now
remove the old custom calls for context save and restore.

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>
Acked-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 0 insertions, 43 deletions

diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index 8aea155b10a8..0f68c6faecad 100644
--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -68,13 +68,6 @@ static void omap_clear_dma(int lch);
 static int enable_1510_mode;
 static u32 errata;
 
-static struct omap_dma_global_context_registers {
-	u32 dma_irqenable_l0;
-	u32 dma_irqenable_l1;
-	u32 dma_ocp_sysconfig;
-	u32 dma_gcr;
-} omap_dma_global_context;
-
 struct dma_link_info {
 	int *linked_dmach_q;
 	int no_of_lchs_linked;
@@ -905,42 +898,6 @@ static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
 #define omap1_dma_irq_handler	NULL
 #endif
 
-/*
- * Note that we are currently using only IRQENABLE_L0 and L1.
- * As the DSP may be using IRQENABLE_L2 and L3, let's not
- * touch those for now.
- */
-void omap_dma_global_context_save(void)
-{
-	omap_dma_global_context.dma_irqenable_l0 =
-		p->dma_read(IRQENABLE_L0, 0);
-	omap_dma_global_context.dma_irqenable_l1 =
-		p->dma_read(IRQENABLE_L1, 0);
-	omap_dma_global_context.dma_ocp_sysconfig =
-		p->dma_read(OCP_SYSCONFIG, 0);
-	omap_dma_global_context.dma_gcr = p->dma_read(GCR, 0);
-}
-
-void omap_dma_global_context_restore(void)
-{
-	int ch;
-
-	p->dma_write(omap_dma_global_context.dma_gcr, GCR, 0);
-	p->dma_write(omap_dma_global_context.dma_ocp_sysconfig,
-		OCP_SYSCONFIG, 0);
-	p->dma_write(omap_dma_global_context.dma_irqenable_l0,
-		IRQENABLE_L0, 0);
-	p->dma_write(omap_dma_global_context.dma_irqenable_l1,
-		IRQENABLE_L1, 0);
-
-	if (IS_DMA_ERRATA(DMA_ROMCODE_BUG))
-		p->dma_write(0x3 , IRQSTATUS_L0, 0);
-
-	for (ch = 0; ch < dma_chan_count; ch++)
-		if (dma_chan[ch].dev_id != -1)
-			omap_clear_dma(ch);
-}
-
 struct omap_system_dma_plat_info *omap_get_plat_info(void)
 {
 	return p;