* [U-Boot] [PATCH] ARM: tegra: flush caches via SMC call
@ 2016-09-23 23:43 Stephen Warren
2016-09-27 0:34 ` Simon Glass
0 siblings, 1 reply; 2+ messages in thread
From: Stephen Warren @ 2016-09-23 23:43 UTC (permalink / raw)
To: u-boot
From: Stephen Warren <swarren@nvidia.com>
On Tegra186, it is necessary to perform an SMC to fully flush all caches;
flushing/cleaning by set/way is not enough. Implement the required hook
to make this happen.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
arch/arm/mach-tegra/tegra186/Makefile | 1 +
arch/arm/mach-tegra/tegra186/cache.c | 23 +++++++++++++++++++++++
2 files changed, 24 insertions(+)
create mode 100644 arch/arm/mach-tegra/tegra186/cache.c
diff --git a/arch/arm/mach-tegra/tegra186/Makefile b/arch/arm/mach-tegra/tegra186/Makefile
index 26bc462930c1..56f3378ecea3 100644
--- a/arch/arm/mach-tegra/tegra186/Makefile
+++ b/arch/arm/mach-tegra/tegra186/Makefile
@@ -3,6 +3,7 @@
# SPDX-License-Identifier: GPL-2.0
obj-y += ../board186.o
+obj-y += cache.o
obj-y += nvtboot_board.o
obj-y += nvtboot_ll.o
obj-y += nvtboot_mem.o
diff --git a/arch/arm/mach-tegra/tegra186/cache.c b/arch/arm/mach-tegra/tegra186/cache.c
new file mode 100644
index 000000000000..adaed8968eb9
--- /dev/null
+++ b/arch/arm/mach-tegra/tegra186/cache.c
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2016, NVIDIA CORPORATION.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <asm/system.h>
+
+#define SMC_SIP_INVOKE_MCE 0x82FFFF00
+#define MCE_SMC_ROC_FLUSH_CACHE 11
+
+int __asm_flush_l3_cache(void)
+{
+ struct pt_regs regs = {0};
+
+ isb();
+
+ regs.regs[0] = SMC_SIP_INVOKE_MCE | MCE_SMC_ROC_FLUSH_CACHE;
+ smc_call(®s);
+
+ return 0;
+}
--
2.9.3
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [U-Boot] [PATCH] ARM: tegra: flush caches via SMC call
2016-09-23 23:43 [U-Boot] [PATCH] ARM: tegra: flush caches via SMC call Stephen Warren
@ 2016-09-27 0:34 ` Simon Glass
0 siblings, 0 replies; 2+ messages in thread
From: Simon Glass @ 2016-09-27 0:34 UTC (permalink / raw)
To: u-boot
On 23 September 2016 at 17:43, Stephen Warren <swarren@wwwdotorg.org> wrote:
> From: Stephen Warren <swarren@nvidia.com>
>
> On Tegra186, it is necessary to perform an SMC to fully flush all caches;
> flushing/cleaning by set/way is not enough. Implement the required hook
> to make this happen.
>
> Signed-off-by: Stephen Warren <swarren@nvidia.com>
> ---
> arch/arm/mach-tegra/tegra186/Makefile | 1 +
> arch/arm/mach-tegra/tegra186/cache.c | 23 +++++++++++++++++++++++
> 2 files changed, 24 insertions(+)
> create mode 100644 arch/arm/mach-tegra/tegra186/cache.c
Reviewed-by: Simon Glass <sjg@chromium.org>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2016-09-23 23:43 [U-Boot] [PATCH] ARM: tegra: flush caches via SMC call Stephen Warren
2016-09-27 0:34 ` Simon Glass
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