/* * (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> DECLARE_GLOBAL_DATA_PTR; #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) { 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) { 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); } void dcache_enable (void) { return; } void dcache_disable (void) { return; } int dcache_status (void) { return 0; /* always off */ } /* * Reset board */ int do_reset (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]) { #if defined(CONFIG_PATI) volatile ulong *addr = (ulong *) CFG_RESET_ADDRESS; *addr = 1; #else 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) (); #endif /* #if defined(CONFIG_PATI) */ return 1; }