2 * Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved.
4 * The code contained herein is licensed under the GNU General Public
5 * License. You may obtain a copy of the GNU General Public License
6 * Version 2 or later at the following locations:
8 * http://www.opensource.org/licenses/gpl-license.html
9 * http://www.gnu.org/copyleft/gpl.html
11 * This file contains the CPU initialization code.
14 #include <linux/types.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/module.h>
20 #include <linux/of_address.h>
25 static int mx5_cpu_rev = -1;
29 static u32 imx5_read_srev_reg(const char *compat)
31 void __iomem *iim_base;
32 struct device_node *np;
35 np = of_find_compatible_node(NULL, NULL, compat);
36 iim_base = of_iomap(np, 0);
39 srev = readl(iim_base + IIM_SREV) & 0xff;
46 static int get_mx51_srev(void)
48 u32 rev = imx5_read_srev_reg("fsl,imx51-iim");
52 return IMX_CHIP_REVISION_2_0;
54 return IMX_CHIP_REVISION_3_0;
56 return IMX_CHIP_REVISION_UNKNOWN;
62 * the silicon revision of the cpu
63 * -EINVAL - not a mx51
65 int mx51_revision(void)
70 if (mx5_cpu_rev == -1)
71 mx5_cpu_rev = get_mx51_srev();
75 EXPORT_SYMBOL(mx51_revision);
80 * All versions of the silicon before Rev. 3 have broken NEON implementations.
81 * Dependent on link order - so the assumption is that vfp_init is called
84 int __init mx51_neon_fixup(void)
86 if (mx51_revision() < IMX_CHIP_REVISION_3_0 &&
87 (elf_hwcap & HWCAP_NEON)) {
88 elf_hwcap &= ~HWCAP_NEON;
89 pr_info("Turning off NEON support, detected broken NEON implementation\n");
96 static int get_mx53_srev(void)
98 u32 rev = imx5_read_srev_reg("fsl,imx53-iim");
102 return IMX_CHIP_REVISION_1_0;
104 return IMX_CHIP_REVISION_2_0;
106 return IMX_CHIP_REVISION_2_1;
108 return IMX_CHIP_REVISION_UNKNOWN;
114 * the silicon revision of the cpu
115 * -EINVAL - not a mx53
117 int mx53_revision(void)
122 if (mx5_cpu_rev == -1)
123 mx5_cpu_rev = get_mx53_srev();
127 EXPORT_SYMBOL(mx53_revision);