https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 156171c71a0dc4bce12b4408bb1591f8fe32dc1a authored by Linus Torvalds on 13 November 2009, 00:46:07 UTC
Linux 2.6.32-rc7
Linux 2.6.32-rc7
Tip revision: 156171c
cpu_imx27.c
/*
* Copyright 2007 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright 2008 Juergen Beisert, kernel@pengutronix.de
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
/*
* i.MX27 specific CPU detection code
*/
#include <linux/io.h>
#include <linux/module.h>
#include <mach/hardware.h>
static int cpu_silicon_rev = -1;
static int cpu_partnumber;
#define SYS_CHIP_ID 0x00 /* The offset of CHIP ID register */
static void query_silicon_parameter(void)
{
u32 val;
/*
* now we have access to the IO registers. As we need
* the silicon revision very early we read it here to
* avoid any further hooks
*/
val = __raw_readl(IO_ADDRESS(SYSCTRL_BASE_ADDR) + SYS_CHIP_ID);
cpu_silicon_rev = (int)(val >> 28);
cpu_partnumber = (int)((val >> 12) & 0xFFFF);
}
/*
* Returns:
* the silicon revision of the cpu
* -EINVAL - not a mx27
*/
int mx27_revision(void)
{
if (cpu_silicon_rev == -1)
query_silicon_parameter();
if (cpu_partnumber != 0x8821)
return -EINVAL;
return cpu_silicon_rev;
}
EXPORT_SYMBOL(mx27_revision);