From d27536c6619221528114746317def345467a3e80 Mon Sep 17 00:00:00 2001 From: Jason Liu Date: Fri, 26 Aug 2011 13:35:19 +0800 Subject: ARM: mx25: Print silicon revision on boot Silicon revision is useful information to have during kernel boot. Print the MX25 silicon revision. Signed-off-by: Fabio Estevam Signed-off-by: Jason Liu Cc: Sascha Hauer Signed-off-by: Sascha Hauer --- arch/arm/mach-imx/cpu-imx25.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 arch/arm/mach-imx/cpu-imx25.c (limited to 'arch/arm/mach-imx/cpu-imx25.c') diff --git a/arch/arm/mach-imx/cpu-imx25.c b/arch/arm/mach-imx/cpu-imx25.c new file mode 100644 index 000000000000..6914bcbf84e4 --- /dev/null +++ b/arch/arm/mach-imx/cpu-imx25.c @@ -0,0 +1,41 @@ +/* + * MX25 CPU type detection + * + * Copyright (c) 2009 Daniel Mack + * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved + * + * 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. + */ +#include +#include +#include +#include + +static int mx25_cpu_rev = -1; + +static int mx25_read_cpu_rev(void) +{ + u32 rev; + + rev = __raw_readl(MX25_IO_ADDRESS(MX25_IIM_BASE_ADDR + MXC_IIMSREV)); + switch (rev) { + case 0x00: + return IMX_CHIP_REVISION_1_0; + case 0x01: + return IMX_CHIP_REVISION_1_1; + default: + return IMX_CHIP_REVISION_UNKNOWN; + } +} + +int mx25_revision(void) +{ + if (mx25_cpu_rev == -1) + mx25_cpu_rev = mx25_read_cpu_rev(); + + return mx25_cpu_rev; +} +EXPORT_SYMBOL(mx25_revision); -- cgit v1.2.3-59-g8ed1b