111 lines
2.2 KiB
C
111 lines
2.2 KiB
C
/*
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* Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved.
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*
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* The code contained herein is licensed under the GNU General Public
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* License. You may obtain a copy of the GNU General Public License
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* Version 2 or later at the following locations:
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*
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* http://www.opensource.org/licenses/gpl-license.html
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* http://www.gnu.org/copyleft/gpl.html
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*
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* This file contains the CPU initialization code.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include "hardware.h"
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#include "common.h"
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static int mx5_cpu_rev = -1;
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#define IIM_SREV 0x24
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static int get_mx51_srev(void)
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{
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void __iomem *iim_base = MX51_IO_ADDRESS(MX51_IIM_BASE_ADDR);
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u32 rev = readl(iim_base + IIM_SREV) & 0xff;
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switch (rev) {
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case 0x0:
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return IMX_CHIP_REVISION_2_0;
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case 0x10:
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return IMX_CHIP_REVISION_3_0;
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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 mx51
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*/
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int mx51_revision(void)
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{
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if (!cpu_is_mx51())
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return -EINVAL;
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if (mx5_cpu_rev == -1)
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mx5_cpu_rev = get_mx51_srev();
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return mx5_cpu_rev;
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}
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EXPORT_SYMBOL(mx51_revision);
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#ifdef CONFIG_NEON
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/*
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* All versions of the silicon before Rev. 3 have broken NEON implementations.
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* Dependent on link order - so the assumption is that vfp_init is called
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* before us.
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*/
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int __init mx51_neon_fixup(void)
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{
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if (mx51_revision() < IMX_CHIP_REVISION_3_0 &&
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(elf_hwcap & HWCAP_NEON)) {
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elf_hwcap &= ~HWCAP_NEON;
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pr_info("Turning off NEON support, detected broken NEON implementation\n");
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}
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return 0;
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}
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#endif
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static int get_mx53_srev(void)
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{
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void __iomem *iim_base = MX51_IO_ADDRESS(MX53_IIM_BASE_ADDR);
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u32 rev = readl(iim_base + IIM_SREV) & 0xff;
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switch (rev) {
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case 0x0:
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return IMX_CHIP_REVISION_1_0;
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case 0x2:
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return IMX_CHIP_REVISION_2_0;
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case 0x3:
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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 mx53
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*/
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int mx53_revision(void)
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{
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if (!cpu_is_mx53())
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return -EINVAL;
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if (mx5_cpu_rev == -1)
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mx5_cpu_rev = get_mx53_srev();
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return mx5_cpu_rev;
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}
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EXPORT_SYMBOL(mx53_revision);
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