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/*
* Copyright (c) 2009 Wind River Systems, Inc.
* Tom Rix <Tom.Rix@windriver.com>
*
* Derived from board specific omap code by
* Richard Woodruff <r-woodruff2@ti.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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/arch/cpu.h>
#include <asm/arch/sys_info.h>
#include <asm/arch/rev.h>
#define __raw_readl(a) (*(volatile unsigned int *)(a))
/*
* get_cpu_rev(void) - extract version info
*/
u32 get_cpu_rev(void)
{
u32 cpuid = 0;
ctrl_id_t *id_base;
/*
* On ES1.0 the IDCODE register is not exposed on L4
* so using CPU ID to differentiate between ES1.0 and > ES1.0.
*/
__asm__ __volatile__("mrc p15, 0, %0, c0, c0, 0":"=r" (cpuid));
if ((cpuid & 0xf) == 0x0)
return CPU_3XX_ES10;
else {
/* Decode the IDs on > ES1.0 */
id_base = (ctrl_id_t *) OMAP34XX_ID_L4_IO_BASE;
cpuid = (__raw_readl(&id_base->idcode) >> CPU_3XX_ID_SHIFT) & 0xf;
/* Some early ES2.0 seem to report ID 0, fix this */
if (cpuid == 0)
cpuid = CPU_3XX_ES20;
return cpuid;
}
}
/*
* cpu_is_3410(void) - returns true for 3410
*/
u32 cpu_is_3410(void)
{
int status;
if(get_cpu_rev() < CPU_3XX_ES20) {
return 0;
} else {
/* read scalability status and return 1 for 3410*/
status = __raw_readl(CONTROL_SCALABLE_OMAP_STATUS);
/* Check whether MPU frequency is set to 266 MHz which
* is nominal for 3410. If yes return true else false
*/
if (((status >> 8) & 0x3) == 0x2)
return 1;
else
return 0;
}
}
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