81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
|
/*
|
||
|
|
* Support for MicroBlaze PVR (processor version register)
|
||
|
|
*
|
||
|
|
* Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
|
||
|
|
* Copyright (C) 2007-2009 PetaLogix
|
||
|
|
* Copyright (C) 2007 John Williams <john.williams@petalogix.com>
|
||
|
|
*
|
||
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
||
|
|
* License. See the file "COPYING" in the main directory of this archive
|
||
|
|
* for more details.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/compiler.h>
|
||
|
|
#include <asm/exceptions.h>
|
||
|
|
#include <asm/pvr.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Until we get an assembler that knows about the pvr registers,
|
||
|
|
* this horrible cruft will have to do.
|
||
|
|
* That hardcoded opcode is mfs r3, rpvrNN
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define get_single_pvr(pvrid, val) \
|
||
|
|
{ \
|
||
|
|
register unsigned tmp __asm__("r3"); \
|
||
|
|
tmp = 0x0; /* Prevent warning about unused */ \
|
||
|
|
__asm__ __volatile__ ( \
|
||
|
|
"mfs %0, rpvr" #pvrid ";" \
|
||
|
|
: "=r" (tmp) : : "memory"); \
|
||
|
|
val = tmp; \
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Does the CPU support the PVR register?
|
||
|
|
* return value:
|
||
|
|
* 0: no PVR
|
||
|
|
* 1: simple PVR
|
||
|
|
* 2: full PVR
|
||
|
|
*
|
||
|
|
* This must work on all CPU versions, including those before the
|
||
|
|
* PVR was even an option.
|
||
|
|
*/
|
||
|
|
|
||
|
|
int cpu_has_pvr(void)
|
||
|
|
{
|
||
|
|
unsigned long flags;
|
||
|
|
unsigned pvr0;
|
||
|
|
|
||
|
|
local_save_flags(flags);
|
||
|
|
|
||
|
|
/* PVR bit in MSR tells us if there is any support */
|
||
|
|
if (!(flags & PVR_MSR_BIT))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
get_single_pvr(0, pvr0);
|
||
|
|
pr_debug("%s: pvr0 is 0x%08x\n", __func__, pvr0);
|
||
|
|
|
||
|
|
if (pvr0 & PVR0_PVR_FULL_MASK)
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
/* for partial PVR use static cpuinfo */
|
||
|
|
return 2;
|
||
|
|
}
|
||
|
|
|
||
|
|
void get_pvr(struct pvr_s *p)
|
||
|
|
{
|
||
|
|
get_single_pvr(0, p->pvr[0]);
|
||
|
|
get_single_pvr(1, p->pvr[1]);
|
||
|
|
get_single_pvr(2, p->pvr[2]);
|
||
|
|
get_single_pvr(3, p->pvr[3]);
|
||
|
|
get_single_pvr(4, p->pvr[4]);
|
||
|
|
get_single_pvr(5, p->pvr[5]);
|
||
|
|
get_single_pvr(6, p->pvr[6]);
|
||
|
|
get_single_pvr(7, p->pvr[7]);
|
||
|
|
get_single_pvr(8, p->pvr[8]);
|
||
|
|
get_single_pvr(9, p->pvr[9]);
|
||
|
|
get_single_pvr(10, p->pvr[10]);
|
||
|
|
get_single_pvr(11, p->pvr[11]);
|
||
|
|
}
|