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msm: iommu: Clock control for the IOMMU driver

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Add clock control to the IOMMU driver. The IOMMU bus clock
(and potentially an AXI clock) need to be on to gain access
to IOMMU registers. Actively control these clocks when
needed instead of leaving them on.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>
This commit is contained in:
Stepan Moskovchenko
2011-02-24 18:00:39 -08:00
committed by David Brown
parent 8bec99b586
commit 41f3f5138a
2 changed files with 63 additions and 6 deletions
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9
arch/arm/mach-msm/include/mach/iommu.h
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@@ -1,4 +1,4 @@
/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@@ -19,6 +19,7 @@
#define MSM_IOMMU_H
#include <linux/interrupt.h>
#include <linux/clk.h>
/* Sharability attributes of MSM IOMMU mappings */
#define MSM_IOMMU_ATTR_NON_SH 0x0
@@ -74,13 +75,17 @@ struct msm_iommu_ctx_dev {
* struct msm_iommu_drvdata - A single IOMMU hardware instance
* @base: IOMMU config port base address (VA)
* @irq: Interrupt number
*
* @clk: The bus clock for this IOMMU hardware instance
* @pclk: The clock for the IOMMU bus interconnect
*
* A msm_iommu_drvdata holds the global driver data about a single piece
* of an IOMMU hardware instance.
*/
struct msm_iommu_drvdata {
void __iomem *base;
int irq;
struct clk *clk;
struct clk *pclk;
};
/**