Message ID | 1444922016-3501-1-git-send-email-dinguyen@opensource.altera.com |
---|---|
State | Accepted |
Delegated to: | Marek Vasut |
Headers | show
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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" <u-boot-bounces@lists.denx.de> |
On Thursday, October 15, 2015 at 05:13:36 PM, dinguyen@opensource.altera.com wrote: > From: Dinh Nguyen <dinguyen@opensource.altera.com> > > Update the L2 AUX CTRL settings for the SoCFPGA. > > Enabling D and I prefetch bits helps improve SDRAM performance on the > platform. > > Also, we need to enable bit 22 of the L2. By not having bit 22 set in the > PL310 Auxiliary Control register (shared attribute override enable) has the > side effect of transforming Normal Shared Non-cacheable reads into > Cacheable no-allocate reads. > > Coherent DMA buffers in Linux always have a Cacheable alias via the > kernel linear mapping and the processor can speculatively load cache > lines into the PL310 controller. With bit 22 cleared, Non-cacheable > reads would unexpectedly hit such cache lines leading to buffer > corruption. > > Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com> Applied, thanks! Best regards, Marek Vasut
diff --git a/arch/arm/include/asm/pl310.h b/arch/arm/include/asm/pl310.h index de7650e..d588f94 100644 --- a/arch/arm/include/asm/pl310.h +++ b/arch/arm/include/asm/pl310.h @@ -17,6 +17,8 @@ #define L2X0_CTRL_EN 1 #define L310_SHARED_ATT_OVERRIDE_ENABLE (1 << 22) +#define L310_AUX_CTRL_DATA_PREFETCH_MASK (1 << 28) +#define L310_AUX_CTRL_INST_PREFETCH_MASK (1 << 29) struct pl310_regs { u32 pl310_cache_id; diff --git a/arch/arm/mach-socfpga/misc.c b/arch/arm/mach-socfpga/misc.c index 0940cc5..bbd31ef 100644 --- a/arch/arm/mach-socfpga/misc.c +++ b/arch/arm/mach-socfpga/misc.c @@ -52,6 +52,18 @@ void enable_caches(void) #endif } +void v7_outer_cache_enable(void) +{ + /* disable the L2 cache */ + writel(0, &pl310->pl310_ctrl); + + /* enable BRESP, instruction and data prefetch, full line of zeroes */ + setbits_le32(&pl310->pl310_aux_ctrl, + L310_AUX_CTRL_DATA_PREFETCH_MASK | + L310_AUX_CTRL_INST_PREFETCH_MASK | + L310_SHARED_ATT_OVERRIDE_ENABLE); +} + /* * DesignWare Ethernet initialization */