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.
This was tested by the following command:
fatload mmc 0:1 ${kernel_addr_r} zImage
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 (6): 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 arm/rpi: Enable dcache
arch/arm/cpu/arm11/Makefile | 8 ++ arch/arm/cpu/arm11/cpu.c | 150 ++++++++++++++++++++++++++++ arch/arm/cpu/arm1136/Makefile | 1 - arch/arm/cpu/arm1136/cpu.c | 160 ------------------------------ arch/arm/cpu/arm1176/Makefile | 4 +- arch/arm/cpu/arm1176/cpu.c | 51 ---------- arch/arm/mach-bcm283x/include/mach/mbox.h | 4 + arch/arm/mach-bcm283x/mbox.c | 9 ++ board/raspberrypi/rpi/rpi.c | 10 +- drivers/video/bcm2835.c | 4 +- include/configs/rpi-common.h | 2 +- include/configs/rpi_2.h | 1 + 12 files changed, 183 insertions(+), 221 deletions(-) create mode 100644 arch/arm/cpu/arm11/Makefile create mode 100644 arch/arm/cpu/arm11/cpu.c delete mode 100644 arch/arm/cpu/arm1136/cpu.c delete mode 100644 arch/arm/cpu/arm1176/cpu.c