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| author | Kalle Jokiniemi <kalle.jokiniemi@digia.com> | 2009-03-26 15:59:00 +0200 |
|---|---|---|
| committer | Kevin Hilman <khilman@deeprootsystems.com> | 2009-11-11 14:42:26 -0800 |
| commit | ba50ea7eb9ce663511013b35608cf0753c9ab674 (patch) | |
| tree | e3dc023dd370a66ece98ba3fdae2f90db871cdbf /arch/arm/mach-omap2 | |
| parent | 133464dc30846282b5f852433d7b6a31f292f886 (diff) | |
| download | op-kernel-dev-ba50ea7eb9ce663511013b35608cf0753c9ab674.zip op-kernel-dev-ba50ea7eb9ce663511013b35608cf0753c9ab674.tar.gz | |
OMAP3: PM: Fix secure SRAM context save/restore
The secure sram context save uses dma channels 0 and 1.
In order to avoid collision between kernel DMA transfers and
ROM code dma transfers, we need to reserve DMA channels 0
1 on high security devices.
A bug in ROM code leaves dma irq status bits uncleared.
Hence those irq status bits need to be cleared when restoring
DMA context after off mode.
There was also a faulty parameter given to PPA in the secure
ram context save assembly code, which caused interrupts to
be enabled during secure ram context save. This caused the
save to fail sometimes, which resulted the saved context
to be corrupted, but also left DMA channels in secure mode.
The secure mode DMA channels caused "DMA secure error with
device 0" errors to be displayed.
Signed-off-by: Kalle Jokiniemi <kalle.jokiniemi@digia.com>
Signed-off-by: Jouni Hogander <jouni.hogander@nokia.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Diffstat (limited to 'arch/arm/mach-omap2')
| -rw-r--r-- | arch/arm/mach-omap2/pm34xx.c | 3 | ||||
| -rw-r--r-- | arch/arm/mach-omap2/sleep34xx.S | 2 |
2 files changed, 1 insertions, 4 deletions
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c index 3f1f656..a9f4034 100644 --- a/arch/arm/mach-omap2/pm34xx.c +++ b/arch/arm/mach-omap2/pm34xx.c @@ -130,9 +130,6 @@ static void omap3_save_secure_ram_context(u32 target_mpu_state) u32 ret; if (omap_type() != OMAP2_DEVICE_TYPE_GP) { - /* Disable dma irq before calling secure rom code API */ - omap_dma_disable_irq(0); - omap_dma_disable_irq(1); /* * MPU next state must be set to POWER_ON temporarily, * otherwise the WFI executed inside the ROM code diff --git a/arch/arm/mach-omap2/sleep34xx.S b/arch/arm/mach-omap2/sleep34xx.S index db75167..b6abadc 100644 --- a/arch/arm/mach-omap2/sleep34xx.S +++ b/arch/arm/mach-omap2/sleep34xx.S @@ -68,7 +68,7 @@ save_secure_ram_debug: mov r0, #25 @ set service ID for PPA mov r12, r0 @ copy secure service ID in r12 mov r1, #0 @ set task id for ROM code in r1 - mov r2, #7 @ set some flags in r2, r6 + mov r2, #4 @ set some flags in r2, r6 mov r6, #0xff mcr p15, 0, r0, c7, c10, 4 @ data write barrier mcr p15, 0, r0, c7, c10, 5 @ data memory barrier |
