From e8de0fa89656a03d1ecc90cbee4b8a897d268c7e Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Sat, 26 Nov 2011 08:11:32 +0100 Subject: PXA: Add cpuinfo display for PXA2xx Signed-off-by: Marek Vasut --- arch/arm/cpu/pxa/Makefile | 2 + arch/arm/cpu/pxa/cpuinfo.c | 132 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 134 insertions(+) create mode 100644 arch/arm/cpu/pxa/cpuinfo.c (limited to 'arch/arm') diff --git a/arch/arm/cpu/pxa/Makefile b/arch/arm/cpu/pxa/Makefile index 29dc63781..e08883256 100644 --- a/arch/arm/cpu/pxa/Makefile +++ b/arch/arm/cpu/pxa/Makefile @@ -30,6 +30,8 @@ START = start.o COBJS-$(CONFIG_CPU_PXA25X) = pxa2xx.o COBJS-$(CONFIG_CPU_PXA27X) = pxa2xx.o +COBJS-y += cpuinfo.o + COBJS = $(COBJS-y) COBJS += pxafb.o COBJS += timer.o diff --git a/arch/arm/cpu/pxa/cpuinfo.c b/arch/arm/cpu/pxa/cpuinfo.c new file mode 100644 index 000000000..f1cdd408e --- /dev/null +++ b/arch/arm/cpu/pxa/cpuinfo.c @@ -0,0 +1,132 @@ +/* + * PXA CPU information display + * + * Copyright (C) 2011 Marek Vasut + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include +#include +#include +#include + +#define CPU_MASK_PXA_REVID 0x00f + +#define CPU_MASK_PXA_PRODID 0x3f0 +#define CPU_VALUE_PXA25X 0x100 +#define CPU_VALUE_PXA27X 0x110 + +static uint32_t pxa_get_cpuid(void) +{ + uint32_t cpuid; + asm volatile("mrc p15, 0, %0, c0, c0, 0" : "=r"(cpuid)); + return cpuid; +} + +int cpu_is_pxa25x(void) +{ + uint32_t id = pxa_get_cpuid(); + id &= CPU_MASK_PXA_PRODID; + return id == CPU_VALUE_PXA25X; +} + +int cpu_is_pxa27x(void) +{ + uint32_t id = pxa_get_cpuid(); + id &= CPU_MASK_PXA_PRODID; + return id == CPU_VALUE_PXA27X; +} + +#ifdef CONFIG_DISPLAY_CPUINFO +static const char *pxa25x_get_revision(void) +{ + static __maybe_unused const char * const revs_25x[] = { "A0" }; + static __maybe_unused const char * const revs_26x[] = { + "A0", "B0", "B1" + }; + static const char *unknown = "Unknown"; + uint32_t id; + + if (!cpu_is_pxa25x()) + return unknown; + + id = pxa_get_cpuid() & CPU_MASK_PXA_REVID; + +/* PXA26x is a sick special case as it can't be told apart from PXA25x :-( */ +#ifdef CONFIG_CPU_PXA26X + switch (id) { + case 3: return revs_26x[0]; + case 5: return revs_26x[1]; + case 6: return revs_26x[2]; + } +#else + if (id == 6) + return revs_25x[0]; +#endif + return unknown; +} + +static const char *pxa27x_get_revision(void) +{ + static const char *const rev[] = { "A0", "A1", "B0", "B1", "C0", "C5" }; + static const char *unknown = "Unknown"; + uint32_t id; + + if (!cpu_is_pxa27x()) + return unknown; + + id = pxa_get_cpuid() & CPU_MASK_PXA_REVID; + + if ((id == 5) || (id == 6) || (id > 7)) + return unknown; + + /* Cap the special PXA270 C5 case. */ + if (id == 7) + id = 5; + + return rev[id]; +} + +static int print_cpuinfo_pxa2xx(void) +{ + if (cpu_is_pxa25x()) { + puts("Marvell PXA25x rev. "); + puts(pxa25x_get_revision()); + } else if (cpu_is_pxa27x()) { + puts("Marvell PXA27x rev. "); + puts(pxa27x_get_revision()); + } else + return -EINVAL; + + puts("\n"); + + return 0; +} + +int print_cpuinfo(void) +{ + int ret; + + puts("CPU: "); + + ret = print_cpuinfo_pxa2xx(); + if (!ret) + return ret; + + return ret; +} +#endif -- cgit v1.2.3