/* * (C) Copyright 2000-2002 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * 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 */ /* * m8xx.c * * CPU specific code * * written or collected and sometimes rewritten by * Magnus Damm <damm@bitsmart.com> * * minor modifications by * Wolfgang Denk <wd@denx.de> */ #include <common.h> #include <watchdog.h> #include <command.h> #include <mpc8xx.h> #include <asm/cache.h> static char *cpu_warning = "\n " \ "*** Warning: CPU Core has Silicon Bugs -- Check the Errata ***"; #if ((defined(CONFIG_MPC86x) || defined(CONFIG_MPC855)) && \ !defined(CONFIG_MPC862)) # if defined(CONFIG_MPC855) # define ID_STR "PC855" # elif defined(CONFIG_MPC852T) # define ID_STR "PC852T" # elif defined(CONFIG_MPC859T) # define ID_STR "PC859T" # elif defined(CONFIG_MPC859DSL) # define ID_STR "PC859DSL" # elif defined(CONFIG_MPC860P) # define ID_STR "PC860P" # elif defined(CONFIG_MPC866T) # define ID_STR "PC866T" # else # define ID_STR "PC86x" /* unknown 86x chip */ # endif static int check_CPU (long clock, uint pvr, uint immr) { volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000); uint k, m; char buf[32]; char pre = 'X'; char *mid = "xx"; char *suf; /* the highest 16 bits should be 0x0050 for a 860 */ if ((pvr >> 16) != 0x0050) return -1; k = (immr << 16) | *((ushort *) & immap->im_cpm.cp_dparam[0xB0]); m = 0; switch (k) { #ifdef CONFIG_MPC866_et_al /* MPC866P/MPC866T/MPC859T/MPC859DSL/MPC852T */ case 0x08000003: pre = 'M'; suf = ""; m = 1; break; #else case 0x00020001: pre = 'p'; suf = ""; break; case 0x00030001: suf = ""; break; case 0x00120003: suf = "A"; break; case 0x00130003: suf = "A3"; break; case 0x00200004: suf = "B"; break; case 0x00300004: suf = "C"; break; case 0x00310004: suf = "C1"; m = 1; break; case 0x00200064: mid = "SR"; suf = "B"; break; case 0x00300065: mid = "SR"; suf = "C"; break; case 0x00310065: mid = "SR"; suf = "C1"; m = 1; break; case 0x05010000: suf = "D3"; m = 1; break; case 0x05020000: suf = "D4"; m = 1; break; case 0x08000003: suf = ""; m = 1; break; /* this value is not documented anywhere */ case 0x40000000: pre = 'P'; suf = "D"; m = 1; break; #endif default: suf = NULL; break; } if (suf) printf ("%c" ID_STR "%sZPnn%s", pre, mid, suf); else printf ("unknown M" ID_STR " (0x%08x)", k); printf (" at %s MHz:", strmhz (buf, clock)); printf (" %u kB I-Cache", checkicache () >> 10); printf (" %u kB D-Cache", checkdcache () >> 10); /* do we have a FEC (860T/P or 852/859/866)? */ immap->im_cpm.cp_fec.fec_addr_low = 0x12345678; if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) { printf (" FEC present"); } if (!m) { puts (cpu_warning); } putc ('\n'); #ifdef DEBUG if(clock != measure_gclk()) { printf ("clock %ldHz != %dHz\n", clock, measure_gclk()); } #endif return 0; } #elif defined(CONFIG_MPC862) static int check_CPU (long clock, uint pvr, uint immr) { volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000); uint k, m; char buf[32]; char pre = 'X'; char *mid = "xx"; char *suf; /* the highest 16 bits should be 0x0050 for a 8xx */ if ((pvr >> 16) != 0x0050) return -1; k = (immr << 16) | *((ushort *) & immap->im_cpm.cp_dparam[0xB0]); m = 0; switch (k) { /* this value is not documented anywhere */ case 0x06000000: mid = "P"; suf = "0"; break; case 0x06010001: mid = "P"; suf = "A"; m = 1; break; case 0x07000003: mid = "P"; suf = "B"; m = 1; break; default: suf = NULL; break; } if (suf) printf ("%cPC862%sZPnn%s", pre, mid, suf); else printf ("unknown MPC862 (0x%08x)", k); printf (" at %s MHz:", strmhz (buf, clock)); printf (" %u kB I-Cache", checkicache () >> 10); printf (" %u kB D-Cache", checkdcache () >> 10); /* lets check and see if we're running on a 862T (or P?) */ immap->im_cpm.cp_fec.fec_addr_low = 0x12345678; if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) { printf (" FEC present"); } if (!m) { puts (cpu_warning); } putc ('\n'); return 0; } #elif defined(CONFIG_MPC823) static int check_CPU (long clock, uint pvr, uint immr) { volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000); uint k, m; char buf[32]; char *suf; /* the highest 16 bits should be 0x0050 for a 8xx */ if ((pvr >> 16) != 0x0050) return -1; k = (immr << 16) | *((ushort *) & immap->im_cpm.cp_dparam[0xB0]); m = 0; switch (k) { /* MPC823 */ case 0x20000000: suf = "0"; break; case 0x20010000: suf = "0.1"; break; case 0x20020000: suf = "Z2/3"; break; case 0x20020001: suf = "Z3"; break; case 0x21000000: suf = "A"; break; case 0x21010000: suf = "B"; m = 1; break; case 0x21010001: suf = "B2"; m = 1; break; /* MPC823E */ case 0x24010000: suf = NULL; puts ("PPC823EZTnnB2"); m = 1; break; default: suf = NULL; printf ("unknown MPC823 (0x%08x)", k); break; } if (suf) printf ("PPC823ZTnn%s", suf); printf (" at %s MHz:", strmhz (buf, clock)); printf (" %u kB I-Cache", checkicache () >> 10); printf (" %u kB D-Cache", checkdcache () >> 10); /* lets check and see if we're running on a 860T (or P?) */ immap->im_cpm.cp_fec.fec_addr_low = 0x12345678; if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) { puts (" FEC present"); } if (!m) { puts (cpu_warning); } putc ('\n'); return 0; } #elif defined(CONFIG_MPC850) static int check_CPU (long clock, uint pvr, uint immr) { volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000); uint k, m; char buf[32]; /* the highest 16 bits should be 0x0050 for a 8xx */ if ((pvr >> 16) != 0x0050) return -1; k = (immr << 16) | *((ushort *) & immap->im_cpm.cp_dparam[0xB0]); m = 0; switch (k) { case 0x20020001: printf ("XPC850xxZT"); break; case 0x21000065: printf ("XPC850xxZTA"); break; case 0x21010067: printf ("XPC850xxZTB"); m = 1; break; case 0x21020068: printf ("XPC850xxZTC"); m = 1; break; default: printf ("unknown MPC850 (0x%08x)", k); } printf (" at %s MHz:", strmhz (buf, clock)); printf (" %u kB I-Cache", checkicache () >> 10); printf (" %u kB D-Cache", checkdcache () >> 10); /* lets check and see if we're running on a 850T (or P?) */ immap->im_cpm.cp_fec.fec_addr_low = 0x12345678; if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) { printf (" FEC present"); } if (!m) { puts (cpu_warning); } putc ('\n'); return 0; } #else #error CPU undefined #endif /* ------------------------------------------------------------------------- */ 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 (); puts ("CPU: "); /* 850 has PARTNUM 20 */ /* 801 has PARTNUM 10 */ return check_CPU (clock, pvr, immr); } /* ------------------------------------------------------------------------- */ /* L1 i-cache */ /* the standard 860 has 128 sets of 16 bytes in 2 ways (= 4 kB) */ /* the 860 P (plus) has 256 sets of 16 bytes in 4 ways (= 16 kB) */ int checkicache (void) { volatile immap_t *immap = (immap_t *) CFG_IMMR; volatile memctl8xx_t *memctl = &immap->im_memctl; u32 cacheon = rd_ic_cst () & IDC_ENABLED; #ifdef CONFIG_IP86x u32 k = memctl->memc_br1 & ~0x00007fff; /* probe in flash memoryarea */ #else u32 k = memctl->memc_br0 & ~0x00007fff; /* probe in flash memoryarea */ #endif u32 m; u32 lines = -1; wr_ic_cst (IDC_UNALL); wr_ic_cst (IDC_INVALL); wr_ic_cst (IDC_DISABLE); __asm__ volatile ("isync"); while (!((m = rd_ic_cst ()) & IDC_CERR2)) { wr_ic_adr (k); wr_ic_cst (IDC_LDLCK); __asm__ volatile ("isync"); lines++; k += 0x10; /* the number of bytes in a cacheline */ } wr_ic_cst (IDC_UNALL); wr_ic_cst (IDC_INVALL); if (cacheon) wr_ic_cst (IDC_ENABLE); else wr_ic_cst (IDC_DISABLE); __asm__ volatile ("isync"); return lines << 4; }; /* ------------------------------------------------------------------------- */ /* L1 d-cache */ /* the standard 860 has 128 sets of 16 bytes in 2 ways (= 4 kB) */ /* the 860 P (plus) has 256 sets of 16 bytes in 2 ways (= 8 kB) */ /* call with cache disabled */ int checkdcache (void) { volatile immap_t *immap = (immap_t *) CFG_IMMR; volatile memctl8xx_t *memctl = &immap->im_memctl; u32 cacheon = rd_dc_cst () & IDC_ENABLED; #ifdef CONFIG_IP86x u32 k = memctl->memc_br1 & ~0x00007fff; /* probe in flash memoryarea */ #else u32 k = memctl->memc_br0 & ~0x00007fff; /* probe in flash memoryarea */ #endif u32 m; u32 lines = -1; wr_dc_cst (IDC_UNALL); wr_dc_cst (IDC_INVALL); wr_dc_cst (IDC_DISABLE); while (!((m = rd_dc_cst ()) & IDC_CERR2)) { wr_dc_adr (k); wr_dc_cst (IDC_LDLCK); lines++; k += 0x10; /* the number of bytes in a cacheline */ } wr_dc_cst (IDC_UNALL); wr_dc_cst (IDC_INVALL); if (cacheon) wr_dc_cst (IDC_ENABLE); else wr_dc_cst (IDC_DISABLE); return lines << 4; }; /* ------------------------------------------------------------------------- */ void upmconfig (uint upm, uint * table, uint size) { uint i; uint addr = 0; volatile immap_t *immap = (immap_t *) CFG_IMMR; volatile memctl8xx_t *memctl = &immap->im_memctl; for (i = 0; i < size; i++) { memctl->memc_mdr = table[i]; /* (16-15) */ memctl->memc_mcr = addr | upm; /* (16-16) */ addr++; } } /* ------------------------------------------------------------------------- */ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) { ulong msr, addr; volatile immap_t *immap = (immap_t *) CFG_IMMR; immap->im_clkrst.car_plprcr |= PLPRCR_CSR; /* Checkstop Reset enable */ /* Interrupts and MMU off */ __asm__ volatile ("mtspr 81, 0"); __asm__ volatile ("mfmsr %0":"=r" (msr)); msr &= ~0x1030; __asm__ volatile ("mtmsr %0"::"r" (msr)); /* * 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; } /* ------------------------------------------------------------------------- */ /* * Get timebase clock frequency (like cpu_clk in Hz) * * See table 15-5 pp. 15-16, and SCCR[RTSEL] pp. 15-27. */ 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); } #define PLPRCR_val(a) (((CFG_PLPRCR) & PLPRCR_ ## a ## _MSK) >> PLPRCR_ ## a ## _SHIFT) #ifdef CONFIG_MPC866_et_al /* MFN MFI + ------- MFD + 1 factor = ----------------- (PDF + 1) * 2^S */ factor = (PLPRCR_val(MFI) + PLPRCR_val(MFN)/(PLPRCR_val(MFD)+1))/ (PLPRCR_val(PDF)+1) / (1<<PLPRCR_val(S)); #else factor = PLPRCR_val(MF)+1; #endif oscclk = gd->cpu_clk / factor; if ((immr->im_clkrst.car_sccr & SCCR_RTSEL) == 0 || factor > 2) { return (oscclk / 4); } return (oscclk / 16); } /* ------------------------------------------------------------------------- */ #if defined(CONFIG_WATCHDOG) void watchdog_reset (void) { int re_enable = disable_interrupts (); reset_8xx_watchdog ((immap_t *) CFG_IMMR); if (re_enable) enable_interrupts (); } void reset_8xx_watchdog (volatile immap_t * immr) { # if defined(CONFIG_LWMON) /* * The LWMON board uses a MAX6301 Watchdog * with the trigger pin connected to port PA.7 * * (The old board version used a MAX706TESA Watchdog, which * had to be handled exactly the same.) */ # define WATCHDOG_BIT 0x0100 immr->im_ioport.iop_papar &= ~(WATCHDOG_BIT); /* GPIO */ immr->im_ioport.iop_padir |= WATCHDOG_BIT; /* Output */ immr->im_ioport.iop_paodr &= ~(WATCHDOG_BIT); /* active output */ immr->im_ioport.iop_padat ^= WATCHDOG_BIT; /* Toggle WDI */ # else /* * All other boards use the MPC8xx Internal Watchdog */ immr->im_siu_conf.sc_swsr = 0x556c; /* write magic1 */ immr->im_siu_conf.sc_swsr = 0xaa39; /* write magic2 */ # endif /* CONFIG_LWMON */ } #endif /* CONFIG_WATCHDOG */ /* ------------------------------------------------------------------------- */