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ARM: tegra: add function to read chipid

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Add function to read chip id from APB MISC registers. This function
will also get called from clock driver to flush write operations on
apb bus.

Signed-off-by: Prashant Gaikwad <pgaikwad@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Prashant Gaikwad 2013-01-11 13:16:19 +05:30 committed by Stephen Warren
parent 24e30c9417
commit c7736edf1b
2 changed files with 29 additions and 1 deletions
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8
arch/arm/mach-tegra/fuse.c
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@ -20,6 +20,7 @@
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/io.h> #include <linux/io.h>
#include <linux/export.h> #include <linux/export.h>
#include <linux/tegra-soc.h>
#include "fuse.h" #include "fuse.h"
#include "iomap.h" #include "iomap.h"
@ -105,6 +106,11 @@ static void tegra_get_process_id(void)
tegra_core_process_id = (reg >> 12) & 3; tegra_core_process_id = (reg >> 12) & 3;
} }
u32 tegra_read_chipid(void)
{
return readl_relaxed(IO_ADDRESS(TEGRA_APB_MISC_BASE) + 0x804);
}
void tegra_init_fuse(void) void tegra_init_fuse(void)
{ {
u32 id; u32 id;
@ -119,7 +125,7 @@ void tegra_init_fuse(void)
reg = tegra_apb_readl(TEGRA_APB_MISC_BASE + STRAP_OPT); reg = tegra_apb_readl(TEGRA_APB_MISC_BASE + STRAP_OPT);
tegra_bct_strapping = (reg & RAM_ID_MASK) >> RAM_CODE_SHIFT; tegra_bct_strapping = (reg & RAM_ID_MASK) >> RAM_CODE_SHIFT;
id = readl_relaxed(IO_ADDRESS(TEGRA_APB_MISC_BASE) + 0x804); id = tegra_read_chipid();
tegra_chip_id = (id >> 8) & 0xff; tegra_chip_id = (id >> 8) & 0xff;
switch (tegra_chip_id) { switch (tegra_chip_id) {

22
include/linux/tegra-soc.h Normal file
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@ -0,0 +1,22 @@
/*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __LINUX_TEGRA_SOC_H_
#define __LINUX_TEGRA_SOC_H_
u32 tegra_read_chipid(void);
#endif /* __LINUX_TEGRA_SOC_H_ */