New patch to review for coreboot: 59512d0 libpayload arm64: Allow board to define upper address limit on DMA

[Patrick Georgi]

Patrick Georgi ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/8800

-gerrit

commit 59512d055a87f01fb839257bbdf5a8d31c4ca071
Author: Furquan Shaikh 
Date:   Sat Jan 31 23:24:32 2015 -0800

libpayload arm64: Allow board to define upper address limit on DMA

Instead of forcing boards to have DMA region below 4GiB, provide
    Kconfig option DMA_LIM_EXCL that a board can use to set the upper
    limit in MiB units on the address range reserved by DMA. By default,
    this value is 0x1000 i.e. 4GiB limit on the DMA upper address.

BUG=None
    BRANCH=None
    TEST=Compiles successfully for rush. Default value is seen as 0x1000.

Change-Id: Ie35d3844a0989486ae022f8922fdd4c9d7d57fb4
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: 6716cf312a103bc0440a558fc43c8c77869816e3
    Original-Change-Id: I3ecbb4ec90995ab1568cb0924d5ce9467492697d
    Original-Signed-off-by: Furquan Shaikh 
    Original-Reviewed-on: https://chromium-review.googlesource.com/245250
    Original-Tested-by: Furquan Shaikh 
    Original-Reviewed-by: Aaron Durbin 
    Original-Commit-Queue: Furquan Shaikh 
---
 payloads/libpayload/arch/arm64/Config.in | 4 ++++
 payloads/libpayload/arch/arm64/mmu.c     | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/payloads/libpayload/arch/arm64/Config.in b/payloads/libpayload/arch/arm64/Config.in
index 0f2596c..d2f8e56 100644
--- a/payloads/libpayload/arch/arm64/Config.in
+++ b/payloads/libpayload/arch/arm64/Config.in
@@ -33,4 +33,8 @@ config ARCH_SPECIFIC_OPTIONS # dummy
    def_bool y
    select LITTLE_ENDIAN

+config DMA_LIM_EXCL
+	hex "DMA address limit(exclusive) in MiB units"
+	default 0x1000
+
 endif
diff --git a/payloads/libpayload/arch/arm64/mmu.c b/payloads/libpayload/arch/arm64/mmu.c
index da2127d..adbee0f 100644
--- a/payloads/libpayload/arch/arm64/mmu.c
+++ b/payloads/libpayload/arch/arm64/mmu.c
@@ -609,7 +609,7 @@ static struct mmu_memrange *mmu_add_dma_range(struct mmu_ranges *mmu_ranges)
    /* DMA_DEFAULT_SIZE is multiple of GRANULE_SIZE */
    assert((DMA_DEFAULT_SIZE % GRANULE_SIZE) == 0);
    prop.size = DMA_DEFAULT_SIZE;
-	prop.lim_excl = MIN_64_BIT_ADDR;
+	prop.lim_excl = (uint64_t)CONFIG_LP_DMA_LIM_EXCL * MiB;
    prop.align = GRANULE_SIZE;
    prop.is_valid_range = NULL;
    prop.src_type = TYPE_NORMAL_MEM;