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

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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>
This commit is contained in:
Tero Kristo 2008-08-28 13:13:31 +00:00 committed by Kevin Hilman
parent 2f5939c3ec
commit f2d1185824
3 changed files with 47 additions and 0 deletions
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3
arch/arm/mach-omap2/pm34xx.c
View File

@ -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();
}
/*

39
arch/arm/plat-omap/dma.c
View File

@ -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)

5
arch/arm/plat-omap/include/plat/dma.h
View File

@ -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,