5443856cad
Freescale redboot passes the silicon revision via ATAG_REVISION. Remove this bootloader dependency by doing the same as redboot does in the Kernel. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
100 lines
2 KiB
C
100 lines
2 KiB
C
/*
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* Copyright 2008-2009 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 <mach/hardware.h>
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#include <asm/io.h>
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static int cpu_silicon_rev = -1;
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#define SI_REV 0x48
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static void query_silicon_parameter(void)
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{
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void __iomem *rom = ioremap(MX51_IROM_BASE_ADDR, MX51_IROM_SIZE);
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u32 rev;
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if (!rom) {
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cpu_silicon_rev = -EINVAL;
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return;
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}
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rev = readl(rom + SI_REV);
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switch (rev) {
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case 0x1:
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cpu_silicon_rev = MX51_CHIP_REV_1_0;
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break;
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case 0x2:
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cpu_silicon_rev = MX51_CHIP_REV_1_1;
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break;
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case 0x10:
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cpu_silicon_rev = MX51_CHIP_REV_2_0;
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break;
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case 0x20:
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cpu_silicon_rev = MX51_CHIP_REV_3_0;
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break;
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default:
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cpu_silicon_rev = 0;
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}
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iounmap(rom);
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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 (cpu_silicon_rev == -1)
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query_silicon_parameter();
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return cpu_silicon_rev;
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}
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EXPORT_SYMBOL(mx51_revision);
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static int __init post_cpu_init(void)
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{
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unsigned int reg;
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void __iomem *base;
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if (!cpu_is_mx51())
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return 0;
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base = MX51_IO_ADDRESS(MX51_AIPS1_BASE_ADDR);
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__raw_writel(0x0, base + 0x40);
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__raw_writel(0x0, base + 0x44);
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__raw_writel(0x0, base + 0x48);
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__raw_writel(0x0, base + 0x4C);
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reg = __raw_readl(base + 0x50) & 0x00FFFFFF;
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__raw_writel(reg, base + 0x50);
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base = MX51_IO_ADDRESS(MX51_AIPS2_BASE_ADDR);
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__raw_writel(0x0, base + 0x40);
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__raw_writel(0x0, base + 0x44);
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__raw_writel(0x0, base + 0x48);
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__raw_writel(0x0, base + 0x4C);
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reg = __raw_readl(base + 0x50) & 0x00FFFFFF;
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__raw_writel(reg, base + 0x50);
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return 0;
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}
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postcore_initcall(post_cpu_init);
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