diff options
Diffstat (limited to 'target/linux/ipq806x/patches-4.19/0034-0001-ARM-Add-Krait-L2-register-accessor-functions.patch')
| -rw-r--r-- | target/linux/ipq806x/patches-4.19/0034-0001-ARM-Add-Krait-L2-register-accessor-functions.patch | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches-4.19/0034-0001-ARM-Add-Krait-L2-register-accessor-functions.patch b/target/linux/ipq806x/patches-4.19/0034-0001-ARM-Add-Krait-L2-register-accessor-functions.patch new file mode 100644 index 0000000000..68acbeeec2 --- /dev/null +++ b/target/linux/ipq806x/patches-4.19/0034-0001-ARM-Add-Krait-L2-register-accessor-functions.patch @@ -0,0 +1,115 @@ +From 36d68f64c411e09788687d5919886aadeb92adca Mon Sep 17 00:00:00 2001 +From: Stephen Boyd <sboyd@codeaurora.org> +Date: Tue, 14 Aug 2018 17:42:20 +0530 +Subject: [PATCH 01/12] ARM: Add Krait L2 register accessor functions + +Krait CPUs have a handful of L2 cache controller registers that +live behind a cp15 based indirection register. First you program +the indirection register (l2cpselr) to point the L2 'window' +register (l2cpdr) at what you want to read/write. Then you +read/write the 'window' register to do what you want. The +l2cpselr register is not banked per-cpu so we must lock around +accesses to it to prevent other CPUs from re-pointing l2cpdr +underneath us. + +Cc: Mark Rutland <mark.rutland@arm.com> +Cc: Russell King <linux@arm.linux.org.uk> +Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org> +Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> +Signed-off-by: Sricharan R <sricharan@codeaurora.org> +Tested-by: Craig Tatlor <ctatlor97@gmail.com> +Signed-off-by: Stephen Boyd <sboyd@kernel.org> +--- + arch/arm/common/Kconfig | 3 ++ + arch/arm/common/Makefile | 1 + + arch/arm/common/krait-l2-accessors.c | 48 +++++++++++++++++++++++ + arch/arm/include/asm/krait-l2-accessors.h | 9 +++++ + 4 files changed, 61 insertions(+) + create mode 100644 arch/arm/common/krait-l2-accessors.c + create mode 100644 arch/arm/include/asm/krait-l2-accessors.h + +--- a/arch/arm/common/Kconfig ++++ b/arch/arm/common/Kconfig +@@ -7,6 +7,9 @@ config DMABOUNCE + bool + select ZONE_DMA + ++config KRAIT_L2_ACCESSORS ++ bool ++ + config SHARP_LOCOMO + bool + +--- a/arch/arm/common/Makefile ++++ b/arch/arm/common/Makefile +@@ -7,6 +7,7 @@ obj-y += firmware.o + + obj-$(CONFIG_SA1111) += sa1111.o + obj-$(CONFIG_DMABOUNCE) += dmabounce.o ++obj-$(CONFIG_KRAIT_L2_ACCESSORS) += krait-l2-accessors.o + obj-$(CONFIG_SHARP_LOCOMO) += locomo.o + obj-$(CONFIG_SHARP_PARAM) += sharpsl_param.o + obj-$(CONFIG_SHARP_SCOOP) += scoop.o +--- /dev/null ++++ b/arch/arm/common/krait-l2-accessors.c +@@ -0,0 +1,48 @@ ++// SPDX-License-Identifier: GPL-2.0 ++// Copyright (c) 2018, The Linux Foundation. All rights reserved. ++ ++#include <linux/spinlock.h> ++#include <linux/export.h> ++ ++#include <asm/barrier.h> ++#include <asm/krait-l2-accessors.h> ++ ++static DEFINE_RAW_SPINLOCK(krait_l2_lock); ++ ++void krait_set_l2_indirect_reg(u32 addr, u32 val) ++{ ++ unsigned long flags; ++ ++ raw_spin_lock_irqsave(&krait_l2_lock, flags); ++ /* ++ * Select the L2 window by poking l2cpselr, then write to the window ++ * via l2cpdr. ++ */ ++ asm volatile ("mcr p15, 3, %0, c15, c0, 6 @ l2cpselr" : : "r" (addr)); ++ isb(); ++ asm volatile ("mcr p15, 3, %0, c15, c0, 7 @ l2cpdr" : : "r" (val)); ++ isb(); ++ ++ raw_spin_unlock_irqrestore(&krait_l2_lock, flags); ++} ++EXPORT_SYMBOL(krait_set_l2_indirect_reg); ++ ++u32 krait_get_l2_indirect_reg(u32 addr) ++{ ++ u32 val; ++ unsigned long flags; ++ ++ raw_spin_lock_irqsave(&krait_l2_lock, flags); ++ /* ++ * Select the L2 window by poking l2cpselr, then read from the window ++ * via l2cpdr. ++ */ ++ asm volatile ("mcr p15, 3, %0, c15, c0, 6 @ l2cpselr" : : "r" (addr)); ++ isb(); ++ asm volatile ("mrc p15, 3, %0, c15, c0, 7 @ l2cpdr" : "=r" (val)); ++ ++ raw_spin_unlock_irqrestore(&krait_l2_lock, flags); ++ ++ return val; ++} ++EXPORT_SYMBOL(krait_get_l2_indirect_reg); +--- /dev/null ++++ b/arch/arm/include/asm/krait-l2-accessors.h +@@ -0,0 +1,9 @@ ++/* SPDX-License-Identifier: GPL-2.0 */ ++ ++#ifndef __ASMARM_KRAIT_L2_ACCESSORS_H ++#define __ASMARM_KRAIT_L2_ACCESSORS_H ++ ++extern void krait_set_l2_indirect_reg(u32 addr, u32 val); ++extern u32 krait_get_l2_indirect_reg(u32 addr); ++ ++#endif |