board/purple/purple.c

   1 /*
   2  * (C) Copyright 2003
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <command.h>
  26 #include <asm/inca-ip.h>
  27 #include <asm/regdef.h>
  28 #include <asm/mipsregs.h>
  29 #include <asm/addrspace.h>
  30 #include <asm/cacheops.h>
  31
  32 #include "sconsole.h"
  33
  34 #define cache_unroll(base,op)                   \
  35         __asm__ __volatile__("                  \
  36                 .set noreorder;                 \
  37                 .set mips3;                     \
  38                 cache %1, (%0);                 \
  39                 .set mips0;                     \
  40                 .set reorder"                   \
  41                 :                               \
  42                 : "r" (base),                   \
  43                   "i" (op));
  44
  45 typedef void (*FUNCPTR)(ulong *source, ulong *destination, ulong nlongs);
  46
  47 extern void     asc_serial_init         (void);
  48 extern void     asc_serial_putc         (char);
  49 extern void     asc_serial_puts         (const char *);
  50 extern int      asc_serial_getc         (void);
  51 extern int      asc_serial_tstc         (void);
  52 extern void     asc_serial_setbrg       (void);
  53
  54 static void sdram_timing_init (ulong size)
  55 {
  56         register uint pass;
  57         register uint done;
  58         register uint count;
  59         register uint p0, p1, p2, p3, p4;
  60         register uint addr;
  61
  62 #define WRITE_MC_IOGP_1 *(uint *)0xbf800800 = (p1<<14)+(p2<<13)+(p4<<8)+(p0<<4)+p3;
  63 #define WRITE_MC_IOGP_2 *(uint *)0xbf800800 = (p1<<14)+(p2<<13)+((p4-16)<<8)+(p0<<4)+p3;
  64
  65         done = 0;
  66         p0 = 2;
  67         while (p0 < 4 && done == 0) {
  68             p1 = 0;
  69             while (p1 < 2 && done == 0) {
  70                 p2 = 0;
  71                 while (p2 < 2 && done == 0) {
  72                     p3 = 0;
  73                     while (p3 < 16 && done == 0) {
  74                         count = 0;
  75                         p4 = 0;
  76                         while (p4 < 32 && done == 0) {
  77                             WRITE_MC_IOGP_1;
  78
  79                             for (addr = KSEG1 + 0x4000;
  80                                  addr < KSEG1ADDR (size);
  81                                  addr = addr + 4) {
  82                                         *(uint *) addr = 0xaa55aa55;
  83                             }
  84
  85                             pass = 1;
  86
  87                             for (addr = KSEG1 + 0x4000;
  88                                  addr < KSEG1ADDR (size) && pass == 1;
  89                                  addr = addr + 4) {
  90                                         if (*(uint *) addr != 0xaa55aa55)
  91                                                 pass = 0;
  92                             }
  93
  94                             if (pass == 1) {
  95                                 count++;
  96                             } else {
  97                                 count = 0;
  98                             }
  99
 100                             if (count == 32) {
 101                                 WRITE_MC_IOGP_2;
 102                                 done = 1;
 103                             }
 104                             p4++;
 105                         }
 106                         p3++;
 107                     }
 108                     p2++;
 109                 }
 110                 p1++;
 111             }
 112             p0++;
 113             if (p0 == 1)
 114                 p0++;
 115         }
 116 }
 117
 118 long int initdram(int board_type)
 119 {
 120         /* The only supported number of SDRAM banks is 4.
 121          */
 122 #define CFG_NB  4
 123
 124         ulong   cfgpb0  = *INCA_IP_SDRAM_MC_CFGPB0;
 125         ulong   cfgdw   = *INCA_IP_SDRAM_MC_CFGDW;
 126         int     cols    = cfgpb0 & 0xF;
 127         int     rows    = (cfgpb0 & 0xF0) >> 4;
 128         int     dw      = cfgdw & 0xF;
 129         ulong   size    = (1 << (rows + cols)) * (1 << (dw - 1)) * CFG_NB;
 130         void (*  sdram_init) (ulong);
 131
 132         sdram_init = (void (*)(ulong)) KSEG0ADDR(&sdram_timing_init);
 133
 134         sdram_init(0x10000);
 135
 136         return size;
 137 }
 138
 139 int checkboard (void)
 140 {
 141
 142         unsigned long chipid = *(unsigned long *)0xB800C800;
 143
 144         printf ("Board: Purple PLB 2800 chip version %ld, ", chipid & 0xF);
 145
 146         printf("CPU Speed %d MHz\n", CPU_CLOCK_RATE/1000000);
 147
 148         return 0;
 149 }
 150
 151 int misc_init_r (void)
 152 {
 153         asc_serial_init ();
 154
 155         sconsole_putc   = asc_serial_putc;
 156         sconsole_puts   = asc_serial_puts;
 157         sconsole_getc   = asc_serial_getc;
 158         sconsole_tstc   = asc_serial_tstc;
 159         sconsole_setbrg = asc_serial_setbrg;
 160
 161         sconsole_flush ();
 162         return (0);
 163 }
 164
 165 /*******************************************************************************
 166 *
 167 * copydwords - copy one buffer to another a long at a time
 168 *
 169 * This routine copies the first <nlongs> longs from <source> to <destination>.
 170 */
 171 static void copydwords (ulong *source, ulong *destination, ulong nlongs)
 172 {
 173         ulong temp,temp1;
 174         ulong *dstend = destination + nlongs;
 175
 176         while (destination < dstend)
 177         {
 178                 temp = *source++;
 179                 /* dummy read from sdram */
 180                 temp1 = *(ulong *)0xa0000000;
 181                 /* avoid optimization from compliler */
 182                 *(ulong *)0xbf0081f8 = temp1 + temp;
 183                 *destination++ = temp;
 184
 185         }
 186 }
 187
 188 /*******************************************************************************
 189 *
 190 * copyLongs - copy one buffer to another a long at a time
 191 *
 192 * This routine copies the first <nlongs> longs from <source> to <destination>.
 193 */
 194 static void copyLongs (ulong *source, ulong *destination, ulong nlongs)
 195 {
 196         FUNCPTR absEntry;
 197
 198         absEntry = (FUNCPTR)(0xbf008000+((ulong)copydwords & 0x7));
 199         absEntry(source, destination, nlongs);
 200 }
 201
 202 /*******************************************************************************
 203 *
 204 * programLoad - load program into ram
 205 *
 206 * This routine load copydwords into ram
 207 *
 208 */
 209 static void programLoad(void)
 210 {
 211         FUNCPTR absEntry;
 212         ulong *src,*dst;
 213
 214         src = (ulong *)(TEXT_BASE + 0x428);
 215         dst = (ulong *)0xbf0081d0;
 216
 217         absEntry = (FUNCPTR)(TEXT_BASE + 0x400);
 218         absEntry(src,dst,0x6);
 219
 220         src = (ulong *)((ulong)copydwords & 0xfffffff8);
 221         dst = (ulong *)0xbf008000;
 222
 223         absEntry(src,dst,0x38);
 224 }
 225
 226 /*******************************************************************************
 227 *
 228 * copy_code - copy u-boot image from flash to RAM
 229 *
 230 * This routine is needed to solve flash problems on this board
 231 *
 232 */
 233 void copy_code (ulong dest_addr)
 234 {
 235         extern long uboot_end_data;
 236         unsigned long start;
 237         unsigned long end;
 238
 239         /* load copydwords into ram
 240          */
 241         programLoad();
 242
 243         /* copy u-boot code
 244          */
 245         copyLongs((ulong *)CFG_MONITOR_BASE,
 246                   (ulong *)dest_addr,
 247                   ((ulong)&uboot_end_data - CFG_MONITOR_BASE + 3) / 4);
 248
 249
 250         /* flush caches
 251          */
 252
 253         start = KSEG0;
 254         end = start + CFG_DCACHE_SIZE;
 255         while(start < end) {
 256                 cache_unroll(start,Index_Writeback_Inv_D);
 257                 start += CFG_CACHELINE_SIZE;
 258         }
 259
 260         start = KSEG0;
 261         end = start + CFG_ICACHE_SIZE;
 262         while(start < end) {
 263                 cache_unroll(start,Index_Invalidate_I);
 264                 start += CFG_CACHELINE_SIZE;
 265         }
 266 }