This patchset enables dcache support for Raspberry Pi 1. First the cache support code for arm1136 and 1176 was merged. CONFIG_SYS_CACHELINE_SIZE is defined as 32 bytes which is used as alignment for mailbox buffer allocations. Then rpi mailbox code has now dcache flush for writing the mailbox request and a dcache invalidation for receiving the mailbox answer. Finally the CONFIG_SYS_DCACHE_OFF switch got removed from rpi1 config. It is still set for rpi2 config.
dcache supprt increases the MMC read performance on RPI 1 from 5,4 MiB/s to 12.3 MiB/s. TFTP download over USB Ethernet increases from 2,3 MiB/s to 2,6 to 3,3 MiB/s (seems to vary a lot).
This was tested by the following commands:
fatload mmc 0:1 ${kernel_addr_r} zImage
and
tftp u-boot.bin
Changes in v4: * Added Acked-By and Tested-By of Stephen Warren * Set CONFIG_SYS_CACHELINE_SIZE for rpi and rpi2 appropriately * Updated USB buffer comment about required alignment * Used git format-patch -M to generate patches
Changes in v3: * dwc2 dcache support * Use ALLOC_CACHE_ALIGN_BUFFER for mailbox buffer allocation * Use ARCH_DMA_MINALIGN for size to roundup
Changes in v2: * Merge arm1136/1176 cache code * Use cacheline size as mailbox buffer alignment * Flush/invalidate mailbox buffer up to cacheline size
Alexander Stein (7): arm1136: Remove dead code arm1136/arm1176: Merge cache handling code ARM: bcm283x: Define CONFIG_SYS_CACHELINE_SIZE ARM: bcm283x: Allocate all mailbox buffers cacheline aligned arm/mach-bcm283x/mbox: Flush and invalidate dcache when using fw mailbox dwc2: Add dcache support arm/rpi: Enable dcache
arch/arm/cpu/arm11/Makefile | 8 +++++ arch/arm/cpu/{arm1136 => arm11}/cpu.c | 10 ------ arch/arm/cpu/arm1136/Makefile | 1 - arch/arm/cpu/arm1176/Makefile | 4 ++- arch/arm/cpu/arm1176/cpu.c | 51 ------------------------------- arch/arm/mach-bcm283x/include/mach/mbox.h | 3 ++ arch/arm/mach-bcm283x/mbox.c | 9 ++++++ board/raspberrypi/rpi/rpi.c | 10 +++--- drivers/usb/host/dwc2.c | 18 ++++++++--- drivers/video/bcm2835.c | 4 +-- include/configs/rpi-common.h | 1 - include/configs/rpi.h | 2 ++ include/configs/rpi_2.h | 2 ++ 13 files changed, 48 insertions(+), 75 deletions(-) create mode 100644 arch/arm/cpu/arm11/Makefile rename arch/arm/cpu/{arm1136 => arm11}/cpu.c (94%) delete mode 100644 arch/arm/cpu/arm1176/cpu.c