linux-kernel - [PATCHv3 2/4] ARM: tegra: Add SMMU enabler in AHB

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Date:	Wed, 25 Apr 2012 14:07:37 +0300
From:	Hiroshi DOYU <hdoyu@...dia.com>
To:	swarren@...dia.com
Cc:	linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Hiroshi DOYU <hdoyu@...dia.com>, Felipe Balbi <balbi@...com>,
	Colin Cross <ccross@...roid.com>,
	Olof Johansson <olof@...om.net>,
	Stephen Warren <swarren@...dotorg.org>,
	Russell King <linux@....linux.org.uk>,
	Tony Lindgren <tony@...mide.com>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	Jamie Iles <jamie@...ieiles.com>,
	Rob Herring <rob.herring@...xeda.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCHv3 2/4] ARM: tegra: Add SMMU enabler in AHB

Add extern func, "tegra_ahb_enable_smmu()" to inform AHB that SMMU is
ready.

Signed-off-by: Hiroshi DOYU <hdoyu@...dia.com>
Cc: Felipe Balbi <balbi@...com>
---
 arch/arm/mach-tegra/include/mach/tegra-ahb.h |   19 +++++++++++++++++++
 drivers/platform/arm/tegra-ahb.c             |   24 ++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-tegra/include/mach/tegra-ahb.h b/arch/arm/mach-tegra/include/mach/tegra-ahb.h
new file mode 100644
index 0000000..296688c
--- /dev/null
+++ b/arch/arm/mach-tegra/include/mach/tegra-ahb.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#ifndef __MACH_TEGRA_AHB_H__
+#define __MACH_TEGRA_AHB_H__
+
+extern int tegra_ahb_enable_smmu(void);
+
+#endif	/* __MACH_TEGRA_AHB_H__ */
diff --git a/drivers/platform/arm/tegra-ahb.c b/drivers/platform/arm/tegra-ahb.c
index dcad2ec..7ad9dfd 100644
--- a/drivers/platform/arm/tegra-ahb.c
+++ b/drivers/platform/arm/tegra-ahb.c
@@ -78,6 +78,10 @@
 
 #define AHB_ARBITRATION_AHB_MEM_WRQUE_MST_ID	0xf8
 
+#define AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE BIT(17)
+
+static struct platform_driver tegra_ahb_driver;
+
 static u32 tegra_ahb_gizmo[] = {
 	AHB_ARBITRATION_DISABLE,
 	AHB_ARBITRATION_PRIORITY_CTRL,
@@ -126,6 +130,26 @@ static inline void gizmo_writel(struct tegra_ahb *ahb, u32 value, u32 offset)
 	writel(value, ahb->regs + offset);
 }
 
+#ifdef CONFIG_ARCH_TEGRA_3x_SOC
+static int __tegra_ahb_enable_smmu(struct device *dev, void *data)
+{
+	u32 val;
+	struct tegra_ahb *ahb = dev_get_drvdata(dev);
+
+	val = gizmo_readl(ahb, AHB_ARBITRATION_XBAR_CTRL);
+	val |= AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE;
+	gizmo_writel(ahb, val, AHB_ARBITRATION_XBAR_CTRL);
+	return 0;
+}
+
+int tegra_ahb_enable_smmu(void)
+{
+	return driver_for_each_device(&tegra_ahb_driver.driver, NULL, NULL,
+				      __tegra_ahb_enable_smmu);
+}
+EXPORT_SYMBOL(tegra_ahb_enable_smmu);
+#endif
+
 static int tegra_ahb_suspend(struct device *dev)
 {
 	int i;
-- 
1.7.5.4

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