linux-kernel - [PATCH v3 2/7] ARM: l2c: Add interface to ask hypervisor to configure L2C

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Date:	Thu, 17 Jul 2014 18:38:57 +0200
From:	Tomasz Figa <t.figa@...sung.com>
To:	linux-samsung-soc@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Kukjin Kim <kgene.kim@...sung.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	lauraa@...eaurora.org, linux-omap@...r.kernel.org,
	linus.walleij@...aro.org, santosh.shilimkar@...com,
	tony@...mide.com, drake@...lessm.com,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>, loeliger@...il.com,
	Tomasz Figa <t.figa@...sung.com>
Subject: [PATCH v3 2/7] ARM: l2c: Add interface to ask hypervisor to configure
 L2C

Because certain secure hypervisor do not allow writes to individual L2C
registers, but rather expect set of parameters to be passed as argument
to secure monitor calls, there is a need to provide an interface for the
L2C driver to ask the firmware to configure the hardware according to
specified parameters. This patch adds such.

Signed-off-by: Tomasz Figa <t.figa@...sung.com>
---
 arch/arm/include/asm/outercache.h | 3 +++
 arch/arm/mm/cache-l2x0.c          | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/arch/arm/include/asm/outercache.h b/arch/arm/include/asm/outercache.h
index 891a56b..563b92f 100644
--- a/arch/arm/include/asm/outercache.h
+++ b/arch/arm/include/asm/outercache.h
@@ -23,6 +23,8 @@
 
 #include <linux/types.h>
 
+struct l2x0_regs;
+
 struct outer_cache_fns {
 	void (*inv_range)(unsigned long, unsigned long);
 	void (*clean_range)(unsigned long, unsigned long);
@@ -36,6 +38,7 @@ struct outer_cache_fns {
 
 	/* This is an ARM L2C thing */
 	void (*write_sec)(unsigned long, unsigned);
+	void (*configure)(const struct l2x0_regs *);
 };
 
 extern struct outer_cache_fns outer_cache;
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 385c047..21a625a0 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -109,6 +109,11 @@ static inline void l2c_unlock(void __iomem *base, unsigned num)
 
 static void l2c_configure(void __iomem *base)
 {
+	if (outer_cache.configure) {
+		outer_cache.configure(&l2x0_saved_regs);
+		return;
+	}
+
 	if (l2x0_data->configure)
 		l2x0_data->configure(base);
 
-- 
1.9.3

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