OMAP: PM: DMA context save/restore for off-mode support

For HS/EMU devices, these additional features are also used:

- DMA interrupt disable routine added
- Added DMA controller reset to DMA context restore

Signed-off-by: Tero Kristo <tero.kristo@nokia.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index bab9b48..54fea79 100644 (file)
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -34,6 +34,7 @@
 #include <plat/sdrc.h>
 #include <plat/prcm.h>
 #include <plat/gpmc.h>
+#include <plat/dma.h>
 
 #include <asm/tlbflush.h>
 
@@ -95,6 +96,7 @@ static void omap3_core_save_context(void)
        omap3_gpmc_save_context();
        /* Save the system control module context, padconf already save above*/
        omap3_control_save_context();
+       omap_dma_global_context_save();
 }
 
 static void omap3_core_restore_context(void)
@@ -105,6 +107,7 @@ static void omap3_core_restore_context(void)
        omap3_gpmc_restore_context();
        /* Restore the interrupt controller context */
        omap_intc_restore_context();
+       omap_dma_global_context_restore();
 }
 
 /*

diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index 3edffde..3105aaa 100644 (file)
--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -54,6 +54,12 @@ enum { DMA_CHAIN_STARTED, DMA_CHAIN_NOTSTARTED };
 
 static int enable_1510_mode;
 
+static struct omap_dma_global_context_registers {
+       u32 dma_irqenable_l0;
+       u32 dma_ocp_sysconfig;
+       u32 dma_gcr;
+} omap_dma_global_context;
+
 struct omap_dma_lch {
        int next_lch;
        int dev_id;
@@ -2341,6 +2347,39 @@ void omap_stop_lcd_dma(void)
 }
 EXPORT_SYMBOL(omap_stop_lcd_dma);
 
+void omap_dma_global_context_save(void)
+{
+       omap_dma_global_context.dma_irqenable_l0 =
+               dma_read(IRQENABLE_L0);
+       omap_dma_global_context.dma_ocp_sysconfig =
+               dma_read(OCP_SYSCONFIG);
+       omap_dma_global_context.dma_gcr = dma_read(GCR);
+}
+
+void omap_dma_global_context_restore(void)
+{
+       dma_write(0x2, OCP_SYSCONFIG);
+       while (!__raw_readl(omap_dma_base + OMAP_DMA4_SYSSTATUS))
+               ;
+       dma_write(omap_dma_global_context.dma_gcr, GCR);
+       dma_write(omap_dma_global_context.dma_ocp_sysconfig,
+               OCP_SYSCONFIG);
+       dma_write(omap_dma_global_context.dma_irqenable_l0,
+               IRQENABLE_L0);
+}
+
+void omap_dma_disable_irq(int lch)
+{
+       u32 val;
+
+       if (cpu_class_is_omap2()) {
+               /* Disable interrupts */
+               val = dma_read(IRQENABLE_L0);
+               val &= ~(1 << lch);
+               dma_write(val, IRQENABLE_L0);
+       }
+}
+
 /*----------------------------------------------------------------------------*/
 
 static int __init omap_init_dma(void)

diff --git a/arch/arm/plat-omap/include/plat/dma.h b/arch/arm/plat-omap/include/plat/dma.h
index 72f680b..1c017b2 100644 (file)
--- a/arch/arm/plat-omap/include/plat/dma.h
+++ b/arch/arm/plat-omap/include/plat/dma.h
@@ -633,6 +633,11 @@ extern void omap_set_dma_dst_endian_type(int lch, enum end_type etype);
 extern void omap_set_dma_src_endian_type(int lch, enum end_type etype);
 extern int omap_get_dma_index(int lch, int *ei, int *fi);
 
+void omap_dma_global_context_save(void);
+void omap_dma_global_context_restore(void);
+
+extern void omap_dma_disable_irq(int lch);
+
 /* Chaining APIs */
 #ifndef CONFIG_ARCH_OMAP1
 extern int omap_request_dma_chain(int dev_id, const char *dev_name,