mirror of
https://github.com/AsahiLinux/u-boot
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132 lines
2.8 KiB
C
132 lines
2.8 KiB
C
/*
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* PXA CPU information display
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*
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* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <errno.h>
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#include <linux/compiler.h>
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#define CPU_MASK_PXA_REVID 0x00f
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#define CPU_MASK_PXA_PRODID 0x3f0
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#define CPU_VALUE_PXA25X 0x100
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#define CPU_VALUE_PXA27X 0x110
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static uint32_t pxa_get_cpuid(void)
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{
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uint32_t cpuid;
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asm volatile("mrc p15, 0, %0, c0, c0, 0" : "=r"(cpuid));
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return cpuid;
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}
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int cpu_is_pxa25x(void)
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{
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uint32_t id = pxa_get_cpuid();
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id &= CPU_MASK_PXA_PRODID;
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return id == CPU_VALUE_PXA25X;
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}
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int cpu_is_pxa27x(void)
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{
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uint32_t id = pxa_get_cpuid();
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id &= CPU_MASK_PXA_PRODID;
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return id == CPU_VALUE_PXA27X;
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}
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#ifdef CONFIG_DISPLAY_CPUINFO
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static const char *pxa25x_get_revision(void)
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{
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static __maybe_unused const char * const revs_25x[] = { "A0" };
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static __maybe_unused const char * const revs_26x[] = {
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"A0", "B0", "B1"
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};
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static const char *unknown = "Unknown";
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uint32_t id;
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if (!cpu_is_pxa25x())
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return unknown;
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id = pxa_get_cpuid() & CPU_MASK_PXA_REVID;
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/* PXA26x is a sick special case as it can't be told apart from PXA25x :-( */
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#ifdef CONFIG_CPU_PXA26X
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switch (id) {
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case 3: return revs_26x[0];
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case 5: return revs_26x[1];
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case 6: return revs_26x[2];
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}
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#else
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if (id == 6)
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return revs_25x[0];
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#endif
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return unknown;
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}
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static const char *pxa27x_get_revision(void)
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{
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static const char *const rev[] = { "A0", "A1", "B0", "B1", "C0", "C5" };
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static const char *unknown = "Unknown";
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uint32_t id;
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if (!cpu_is_pxa27x())
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return unknown;
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id = pxa_get_cpuid() & CPU_MASK_PXA_REVID;
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if ((id == 5) || (id == 6) || (id > 7))
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return unknown;
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/* Cap the special PXA270 C5 case. */
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if (id == 7)
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id = 5;
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return rev[id];
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}
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static int print_cpuinfo_pxa2xx(void)
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{
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if (cpu_is_pxa25x()) {
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puts("Marvell PXA25x rev. ");
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puts(pxa25x_get_revision());
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} else if (cpu_is_pxa27x()) {
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puts("Marvell PXA27x rev. ");
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puts(pxa27x_get_revision());
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} else
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return -EINVAL;
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puts("\n");
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return 0;
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}
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int print_cpuinfo(void)
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{
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int ret;
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puts("CPU: ");
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ret = print_cpuinfo_pxa2xx();
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if (!ret)
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return ret;
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return ret;
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}
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#endif
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