/* * (C) Copyright 2000, 2001, 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 */ #include <common.h> #include <mpc8xx.h> /* ------------------------------------------------------------------------- */ static long int dram_size (long int, long int *, long int); /* ------------------------------------------------------------------------- */ #define _NOT_USED_ 0xFFFFFFFF const uint sdram_table[] = { /* * Single Read. (Offset 0 in UPMA RAM) */ 0x1F0DFC04, 0xEEAFBC04, 0x11AF7C04, 0xEFBAFC00, 0x1FF5FC47, /* last */ /* * SDRAM Initialization (offset 5 in UPMA RAM) * * This is no UPM entry point. The following definition uses * the remaining space to establish an initialization * sequence, which is executed by a RUN command. * */ 0x1FF5FC34, 0xEFEABC34, 0x1FB57C35, /* last */ /* * Burst Read. (Offset 8 in UPMA RAM) */ 0x1F0DFC04, 0xEEAFBC04, 0x10AF7C04, 0xF0AFFC00, 0xF0AFFC00, 0xF1AFFC00, 0xEFBAFC00, 0x1FF5FC47, /* last */ _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, /* * Single Write. (Offset 18 in UPMA RAM) */ 0x1F0DFC04, 0xEEABBC00, 0x01B27C04, 0x1FF5FC47, /* last */ _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, /* * Burst Write. (Offset 20 in UPMA RAM) */ 0x1F0DFC04, 0xEEABBC00, 0x10A77C00, 0xF0AFFC00, 0xF0AFFC00, 0xE1BAFC04, 0x1FF5FC47, /* last */ _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, /* * Refresh (Offset 30 in UPMA RAM) */ 0x1FFD7C84, 0xFFFFFC04, 0xFFFFFC04, 0xFFFFFC04, 0xFFFFFC84, 0xFFFFFC07, /* last */ _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, /* * Exception. (Offset 3c in UPMA RAM) */ 0x7FFFFC07, /* last */ _NOT_USED_, _NOT_USED_, _NOT_USED_, }; /* ------------------------------------------------------------------------- */ /* * Check Board Identity: * * Test TQ ID string (TQM8xx...) * If present, check for "L" type (no second DRAM bank), * otherwise "L" type is assumed as default. * * Set board_type to 'L' for "L" type, 0 else. */ int checkboard (void) { DECLARE_GLOBAL_DATA_PTR; unsigned char *s = getenv ("serial#"); puts ("Board: "); if (!s || strncmp (s, "TQM8", 4)) { puts ("### No HW ID - assuming TQM8xxL\n"); return (0); } if ((*(s + 6) == 'L')) { /* a TQM8xxL type */ gd->board_type = 'L'; } for (; *s; ++s) { if (*s == ' ') break; putc (*s); } putc ('\n'); return (0); } /* ------------------------------------------------------------------------- */ long int initdram (int board_type) { volatile immap_t *immap = (immap_t *) CFG_IMMR; volatile memctl8xx_t *memctl = &immap->im_memctl; long int size8, size9; long int size_b0 = 0; long int size_b1 = 0; upmconfig (UPMA, (uint *) sdram_table, sizeof (sdram_table) / sizeof (uint)); /* * Preliminary prescaler for refresh (depends on number of * banks): This value is selected for four cycles every 62.4 us * with two SDRAM banks or four cycles every 31.2 us with one * bank. It will be adjusted after memory sizing. */ memctl->memc_mptpr = CFG_MPTPR_2BK_8K; /* * The following value is used as an address (i.e. opcode) for * the LOAD MODE REGISTER COMMAND during SDRAM initialisation. If * the port size is 32bit the SDRAM does NOT "see" the lower two * address lines, i.e. mar=0x00000088 -> opcode=0x00000022 for * MICRON SDRAMs: * -> 0 00 010 0 010 * | | | | +- Burst Length = 4 * | | | +----- Burst Type = Sequential * | | +------- CAS Latency = 2 * | +----------- Operating Mode = Standard * +-------------- Write Burst Mode = Programmed Burst Length */ memctl->memc_mar = 0x00000088; /* * Map controller banks 2 and 3 to the SDRAM banks 2 and 3 at * preliminary addresses - these have to be modified after the * SDRAM size has been determined. */ memctl->memc_or2 = CFG_OR2_PRELIM; memctl->memc_br2 = CFG_BR2_PRELIM; #ifndef CONFIG_CAN_DRIVER if (board_type != 'L') { /* "L" type boards have only one bank SDRAM */ memctl->memc_or3 = CFG_OR3_PRELIM; memctl->memc_br3 = CFG_BR3_PRELIM; } #endif /* CONFIG_CAN_DRIVER */ memctl->memc_mamr = CFG_MAMR_8COL & (~(MAMR_PTAE)); /* no refresh yet */ udelay (200); /* perform SDRAM initializsation sequence */ memctl->memc_mcr = 0x80004105; /* SDRAM bank 0 */ udelay (1); memctl->memc_mcr = 0x80004230; /* SDRAM bank 0 - execute twice */ udelay (1); #ifndef CONFIG_CAN_DRIVER if (board_type != 'L') { /* "L" type boards have only one bank SDRAM */ memctl->memc_mcr = 0x80006105; /* SDRAM bank 1 */ udelay (1); memctl->memc_mcr = 0x80006230; /* SDRAM bank 1 - execute twice */ udelay (1); } #endif /* CONFIG_CAN_DRIVER */ memctl->memc_mamr |= MAMR_PTAE; /* enable refresh */ udelay (1000); /* * Check Bank 0 Memory Size for re-configuration * * try 8 column mode */ size8 = dram_size (CFG_MAMR_8COL, (ulong *) SDRAM_BASE2_PRELIM, SDRAM_MAX_SIZE); udelay (1000); /* * try 9 column mode */ size9 = dram_size (CFG_MAMR_9COL, (ulong *) SDRAM_BASE2_PRELIM, SDRAM_MAX_SIZE); if (size8 < size9) { /* leave configuration at 9 columns */ size_b0 = size9; /* debug ("SDRAM Bank 0 in 9 column mode: %ld MB\n", size >> 20); */ } else { /* back to 8 columns */ size_b0 = size8; memctl->memc_mamr = CFG_MAMR_8COL; udelay (500); /* debug ("SDRAM Bank 0 in 8 column mode: %ld MB\n", size >> 20); */ } #ifndef CONFIG_CAN_DRIVER if (board_type != 'L') { /* "L" type boards have only one bank SDRAM */ /* * Check Bank 1 Memory Size * use current column settings * [9 column SDRAM may also be used in 8 column mode, * but then only half the real size will be used.] */ size_b1 = dram_size (memctl->memc_mamr, (ulong *) SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE); /* debug ("SDRAM Bank 1: %ld MB\n", size8 >> 20); */ } else { size_b1 = 0; } #endif /* CONFIG_CAN_DRIVER */ udelay (1000); /* * Adjust refresh rate depending on SDRAM type, both banks * For types > 128 MBit leave it at the current (fast) rate */ if ((size_b0 < 0x02000000) && (size_b1 < 0x02000000)) { /* reduce to 15.6 us (62.4 us / quad) */ memctl->memc_mptpr = CFG_MPTPR_2BK_4K; udelay (1000); } /* * Final mapping: map bigger bank first */ if (size_b1 > size_b0) { /* SDRAM Bank 1 is bigger - map first */ memctl->memc_or3 = ((-size_b1) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM; memctl->memc_br3 = (CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V; if (size_b0 > 0) { /* * Position Bank 0 immediately above Bank 1 */ memctl->memc_or2 = ((-size_b0) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM; memctl->memc_br2 = ((CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V) + size_b1; } else { unsigned long reg; /* * No bank 0 * * invalidate bank */ memctl->memc_br2 = 0; /* adjust refresh rate depending on SDRAM type, one bank */ reg = memctl->memc_mptpr; reg >>= 1; /* reduce to CFG_MPTPR_1BK_8K / _4K */ memctl->memc_mptpr = reg; } } else { /* SDRAM Bank 0 is bigger - map first */ memctl->memc_or2 = ((-size_b0) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM; memctl->memc_br2 = (CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V; if (size_b1 > 0) { /* * Position Bank 1 immediately above Bank 0 */ memctl->memc_or3 = ((-size_b1) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM; memctl->memc_br3 = ((CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V) + size_b0; } else { unsigned long reg; #ifndef CONFIG_CAN_DRIVER /* * No bank 1 * * invalidate bank */ memctl->memc_br3 = 0; #endif /* CONFIG_CAN_DRIVER */ /* adjust refresh rate depending on SDRAM type, one bank */ reg = memctl->memc_mptpr; reg >>= 1; /* reduce to CFG_MPTPR_1BK_8K / _4K */ memctl->memc_mptpr = reg; } } udelay (10000); #ifdef CONFIG_CAN_DRIVER /* Initialize OR3 / BR3 */ memctl->memc_or3 = CFG_OR3_CAN; memctl->memc_br3 = CFG_BR3_CAN; /* Initialize MBMR */ memctl->memc_mbmr = MAMR_GPL_B4DIS; /* GPL_B4 ouput line Disable */ /* Initialize UPMB for CAN: single read */ memctl->memc_mdr = 0xFFFFC004; memctl->memc_mcr = 0x0100 | UPMB; memctl->memc_mdr = 0x0FFFD004; memctl->memc_mcr = 0x0101 | UPMB; memctl->memc_mdr = 0x0FFFC000; memctl->memc_mcr = 0x0102 | UPMB; memctl->memc_mdr = 0x3FFFC004; memctl->memc_mcr = 0x0103 | UPMB; memctl->memc_mdr = 0xFFFFDC05; memctl->memc_mcr = 0x0104 | UPMB; /* Initialize UPMB for CAN: single write */ memctl->memc_mdr = 0xFFFCC004; memctl->memc_mcr = 0x0118 | UPMB; memctl->memc_mdr = 0xCFFCD004; memctl->memc_mcr = 0x0119 | UPMB; memctl->memc_mdr = 0x0FFCC000; memctl->memc_mcr = 0x011A | UPMB; memctl->memc_mdr = 0x7FFCC004; memctl->memc_mcr = 0x011B | UPMB; memctl->memc_mdr = 0xFFFDCC05; memctl->memc_mcr = 0x011C | UPMB; #endif /* CONFIG_CAN_DRIVER */ return (size_b0 + size_b1); } /* ------------------------------------------------------------------------- */ /* * Check memory range for valid RAM. A simple memory test determines * the actually available RAM size between addresses `base' and * `base + maxsize'. Some (not all) hardware errors are detected: * - short between address lines * - short between data lines */ static long int dram_size (long int mamr_value, long int *base, long int maxsize) { volatile immap_t *immap = (immap_t *) CFG_IMMR; volatile memctl8xx_t *memctl = &immap->im_memctl; volatile long int *addr; ulong cnt, val; ulong save[32]; /* to make test non-destructive */ unsigned char i = 0; memctl->memc_mamr = mamr_value; for (cnt = maxsize / sizeof (long); cnt > 0; cnt >>= 1) { addr = base + cnt; /* pointer arith! */ save[i++] = *addr; *addr = ~cnt; } /* write 0 to base address */ addr = base; save[i] = *addr; *addr = 0; /* check at base address */ if ((val = *addr) != 0) { *addr = save[i]; return (0); } for (cnt = 1; cnt <= maxsize / sizeof (long); cnt <<= 1) { addr = base + cnt; /* pointer arith! */ val = *addr; *addr = save[--i]; if (val != (~cnt)) { return (cnt * sizeof (long)); } } return (maxsize); } /* ------------------------------------------------------------------------- */