diff options
author | Kevin Huang <kevinh@nvidia.com> | 2011-09-02 13:30:37 -0700 |
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committer | Dan Willemsen <dwillemsen@nvidia.com> | 2011-11-30 21:49:41 -0800 |
commit | 67abaf8c348f757fc737b08c2a183ed72e67e63a (patch) | |
tree | 474c72a1ae4dda744f16e634277e3007e81b26e8 /arch/arm/mach-tegra/csi.c | |
parent | d0319f29ce8f449a8f68062c4066fc6cf7f84f8d (diff) |
ARM: tegra: Add interface to read/write vi/csi module.
Bug 829327
Reviewed-on: http://git-master/r/50351
Reviewed-by: Kevin Huang (Eng-SW) <kevinh@nvidia.com>
Tested-by: Kevin Huang (Eng-SW) <kevinh@nvidia.com>
Reviewed-by: Jon Mayo <jmayo@nvidia.com>
(cherry picked from commit 43d66ead107fc584068e8b894ef0ccf067b78f35)
Change-Id: I466f8300ae8c8ade5f7ab2783baabe5e744da18a
Reviewed-on: http://git-master/r/61601
Reviewed-by: Varun Colbert <vcolbert@nvidia.com>
Tested-by: Varun Colbert <vcolbert@nvidia.com>
Rebase-Id: R4aa7bd08edad8ad1cb81e5b04961d873e9d01b1a
Diffstat (limited to 'arch/arm/mach-tegra/csi.c')
-rw-r--r-- | arch/arm/mach-tegra/csi.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/csi.c b/arch/arm/mach-tegra/csi.c new file mode 100644 index 000000000000..3b26c7ae2233 --- /dev/null +++ b/arch/arm/mach-tegra/csi.c @@ -0,0 +1,84 @@ +/* + * arch/arm/mach-tegra/csi.c + * + * Copyright (C) 2010-2011 NVIDIA Corporation. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that 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. + * + */ + +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/err.h> +#include <linux/clk.h> +#include <linux/io.h> + +#include <mach/iomap.h> +#include <mach/csi.h> + +#include "clock.h" + +static struct clk *vi_clk; +static struct clk *csi_clk; + +int tegra_vi_csi_writel(u32 val, u32 offset) +{ + if (vi_clk == NULL) { + vi_clk = tegra_get_clock_by_name("vi"); + if (IS_ERR_OR_NULL(vi_clk)) { + pr_err("vi: can't get vi clock\n"); + return -EINVAL; + } + } + clk_enable(vi_clk); + + if (csi_clk == NULL) { + csi_clk = tegra_get_clock_by_name("csi"); + if (IS_ERR_OR_NULL(csi_clk)) { + pr_err("csi: can't get csi clock\n"); + return -EINVAL; + } + } + clk_enable(csi_clk); + + writel(val, IO_TO_VIRT(TEGRA_VI_BASE) + offset * 4); + + clk_disable(csi_clk); + clk_disable(vi_clk); + return 0; +} + +int tegra_vi_csi_readl(u32 offset, u32 *val) +{ + if (vi_clk == NULL) { + vi_clk = tegra_get_clock_by_name("vi"); + if (IS_ERR_OR_NULL(vi_clk)) { + pr_err("vi: can't get vi clock\n"); + return -EINVAL; + } + } + clk_enable(vi_clk); + + if (csi_clk == NULL) { + csi_clk = tegra_get_clock_by_name("csi"); + if (IS_ERR_OR_NULL(csi_clk)) { + pr_err("csi: can't get csi clock\n"); + return -EINVAL; + } + } + clk_enable(csi_clk); + + *val = readl(IO_TO_VIRT(TEGRA_VI_BASE) + offset * 4); + + clk_disable(csi_clk); + clk_disable(vi_clk); + + return 0; +} |