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/*
* (C) Copyright 2003
* Martin Winistoerfer, martinwinistoerfer@gmx.ch.
*
* 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,
*/
/*
* File: cpu.c
*
* Discription: Some cpu specific function for watchdog,
* cpu version test, clock setting ...
*
*/
#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <mpc5xx.h>
#if (defined(CONFIG_MPC555))
# define ID_STR "MPC555/556"
/*
* Check version of cpu with Processor Version Register (PVR)
*/
static int check_cpu_version (long clock, uint pvr, uint immr)
{
char buf[32];
/* The highest 16 bits should be 0x0002 for a MPC555/556 */
if ((pvr >> 16) == 0x0002) {
printf (" " ID_STR " Version %x", (pvr >> 16));
printf (" at %s MHz:", strmhz (buf, clock));
} else {
printf ("Not supported cpu version");
return -1;
}
return 0;
}
#endif /* CONFIG_MPC555 */
/*
* Check version of mpc5xx
*/
int checkcpu (void)
{
DECLARE_GLOBAL_DATA_PTR;
ulong clock = gd->cpu_clk;
uint immr = get_immr (0); /* Return full IMMR contents */
uint pvr = get_pvr (); /* Retrieve PVR register */
puts ("CPU: ");
return check_cpu_version (clock, pvr, immr);
}
/*
* Called by macro WATCHDOG_RESET
*/
#if defined(CONFIG_WATCHDOG)
void watchdog_reset (void)
{
int re_enable = disable_interrupts ();
reset_5xx_watchdog ((immap_t *) CFG_IMMR);
if (re_enable)
enable_interrupts ();
}
/*
* Will clear software reset
*/
void reset_5xx_watchdog (volatile immap_t * immr)
{
/* Use the MPC5xx Internal Watchdog */
immr->im_siu_conf.sc_swsr = 0x556c; /* Prevent SW time-out */
immr->im_siu_conf.sc_swsr = 0xaa39;
}
#endif /* CONFIG_WATCHDOG */
/*
* Get timebase clock frequency
*/
unsigned long get_tbclk (void)
{
DECLARE_GLOBAL_DATA_PTR;
volatile immap_t *immr = (volatile immap_t *) CFG_IMMR;
ulong oscclk, factor;
if (immr->im_clkrst.car_sccr & SCCR_TBS) {
return (gd->cpu_clk / 16);
}
factor = (((CFG_PLPRCR) & PLPRCR_MF_MSK) >> PLPRCR_MF_SHIFT) + 1;
oscclk = gd->cpu_clk / factor;
if ((immr->im_clkrst.car_sccr & SCCR_RTSEL) == 0 || factor > 2) {
return (oscclk / 4);
}
return (oscclk / 16);
}
/*
* Reset board
*/
int do_reset (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
ulong addr;
/* Interrupts off, enable reset */
__asm__ volatile (" mtspr 81, %r0 \n\t"
" mfmsr %r3 \n\t"
" rlwinm %r31,%r3,0,25,23\n\t"
" mtmsr %r31 \n\t");
/*
* Trying to execute the next instruction at a non-existing address
* should cause a machine check, resulting in reset
*/
#ifdef CFG_RESET_ADDRESS
addr = CFG_RESET_ADDRESS;
#else
/*
* note: when CFG_MONITOR_BASE points to a RAM address, CFG_MONITOR_BASE * - sizeof (ulong) is usually a valid address. Better pick an address
* known to be invalid on your system and assign it to CFG_RESET_ADDRESS.
* "(ulong)-1" used to be a good choice for many systems...
*/
addr = CFG_MONITOR_BASE - sizeof (ulong);
#endif
((void (*) (void)) addr) ();
return 1;
}
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