c553138fbd
Instead of __raw_*, define imx_* to *_relaxed and use those. Using imx_* was requested by Arnd because *_relaxed tends to indicate that the code was carefully reviewed to not require any synchronisation and otherwise be safe, which isn't the case here with the automatic conversion. The conversion itself was done using the following spatch (since that automatically adjusts the coding style unlike a simple search&replace). @@ expression E1, E2; @@ -__raw_writel(E1, E2) +imx_writel(E1, E2) @@ expression E1, E2; @@ -__raw_writew(E1, E2) +imx_writew(E1, E2) @@ expression E1; @@ -__raw_readl(E1) +imx_readl(E1) @@ expression E1; @@ -__raw_readw(E1) +imx_readw(E1) Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/*
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* Copyright 2007 Freescale Semiconductor, Inc. All Rights Reserved.
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* Copyright 2008 Juergen Beisert, kernel@pengutronix.de
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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/*
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* i.MX27 specific CPU detection code
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*/
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#include <linux/io.h>
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#include <linux/module.h>
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#include "hardware.h"
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static int mx27_cpu_rev = -1;
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static int mx27_cpu_partnumber;
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#define SYS_CHIP_ID 0x00 /* The offset of CHIP ID register */
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static int mx27_read_cpu_rev(void)
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{
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u32 val;
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/*
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* now we have access to the IO registers. As we need
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* the silicon revision very early we read it here to
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* avoid any further hooks
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*/
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val = imx_readl(MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + SYS_CHIP_ID));
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mx27_cpu_partnumber = (int)((val >> 12) & 0xFFFF);
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switch (val >> 28) {
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case 0:
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return IMX_CHIP_REVISION_1_0;
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case 1:
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return IMX_CHIP_REVISION_2_0;
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case 2:
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return IMX_CHIP_REVISION_2_1;
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default:
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return IMX_CHIP_REVISION_UNKNOWN;
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}
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}
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/*
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* Returns:
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* the silicon revision of the cpu
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* -EINVAL - not a mx27
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*/
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int mx27_revision(void)
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{
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if (mx27_cpu_rev == -1)
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mx27_cpu_rev = mx27_read_cpu_rev();
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if (mx27_cpu_partnumber != 0x8821)
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return -EINVAL;
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return mx27_cpu_rev;
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}
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EXPORT_SYMBOL(mx27_revision);
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