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/*
* PXA CPU information display
*
* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
*
* 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 <common.h>
#include <asm/io.h>
#include <errno.h>
#include <linux/compiler.h>
#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
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