board/mbx8xx/mbx8xx.c

   1 /*
   2  * (C) Copyright 2000
   3  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   4  * Marius Groeger <mgroeger@sysgo.de>
   5  *
   6  * Board specific routines for the MBX
   7  *
   8  * - initialisation
   9  * - interface to VPD data (mac address, clock speeds)
  10  * - memory controller
  11  * - serial io initialisation
  12  * - ethernet io initialisation
  13  *
  14  * -----------------------------------------------------------------
  15  * See file CREDITS for list of people who contributed to this
  16  * project.
  17  *
  18  * This program is free software; you can redistribute it and/or
  19  * modify it under the terms of the GNU General Public License as
  20  * published by the Free Software Foundation; either version 2 of
  21  * the License, or (at your option) any later version.
  22  *
  23  * This program is distributed in the hope that it will be useful,
  24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  * GNU General Public License for more details.
  27  *
  28  * You should have received a copy of the GNU General Public License
  29  * along with this program; if not, write to the Free Software
  30  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  31  * MA 02111-1307 USA
  32  */
  33
  34 #include <common.h>
  35 #include <commproc.h>
  36 #include <mpc8xx.h>
  37 #include "dimm.h"
  38 #include "vpd.h"
  39 #include "csr.h"
  40
  41 /* ------------------------------------------------------------------------- */
  42
  43 static const uint sdram_table_40[] = {
  44         /* DRAM - single read. (offset 0 in upm RAM)
  45          */
  46         0xCFAFC004, 0x0FAFC404, 0x0CAF0C04, 0x30AF0C00,
  47         0xF1BF4805, 0xFFFFC005, 0xFFFFC005, 0xFFFFC005,
  48
  49         /* DRAM - burst read. (offset 8 in upm RAM)
  50          */
  51         0xCFAFC004, 0x0FAFC404, 0x0CAF0C04, 0x03AF0C08,
  52         0x0CAF0C04, 0x03AF0C08, 0x0CAF0C04, 0x03AF0C08,
  53         0x0CAF0C04, 0x30AF0C00, 0xF3BF4805, 0xFFFFC005,
  54         0xFFFFC005, 0xFFFFC005, 0xFFFFC005, 0xFFFFC005,
  55
  56         /* DRAM - single write. (offset 18 in upm RAM)
  57          */
  58         0xCFFF0004, 0x0FFF0404, 0x0CFF0C00, 0x33FF4804,
  59         0xFFFFC005, 0xFFFFC005, 0xFFFFC005, 0xFFFFC005,
  60
  61         /* DRAM - burst write. (offset 20 in upm RAM)
  62          */
  63         0xCFFF0004, 0x0FFF0404, 0x0CFF0C00, 0x03FF0C0C,
  64         0x0CFF0C00, 0x03FF0C0C, 0x0CFF0C00, 0x03FF0C0C,
  65         0x0CFF0C00, 0x33FF4804, 0xFFFFC005, 0xFFFFC005,
  66         0xFFFFC005, 0xFFFFC005, 0xFFFFC005, 0xFFFFC005,
  67
  68         /* refresh  (offset 30 in upm RAM)
  69          */
  70         0xFCFFC004, 0xC0FFC004, 0x01FFC004, 0x0FFFC004,
  71         0x3FFFC004, 0xFFFFC005, 0xFFFFC005, 0xFFFFC005,
  72         0xFFFFC005, 0xFFFFC005, 0xFFFFC005, 0xFFFFC005,
  73
  74         /* exception. (offset 3c in upm RAM)
  75          */
  76         0xFFFFC007, 0xFFFFC007, 0xFFFFC007, 0xFFFFC007,
  77 };
  78
  79 static const uint sdram_table_50[] = {
  80         /* DRAM - single read. (offset 0 in upm RAM)
  81          */
  82         0xCFAFC004, 0x0FAFC404, 0x0CAF8C04, 0x10AF0C04,
  83         0xF0AF0C00, 0xF3BF4805, 0xFFFFC005, 0xFFFFC005,
  84
  85         /* DRAM - burst read. (offset 8 in upm RAM)
  86          */
  87         0xCFAFC004, 0X0FAFC404, 0X0CAF8C04, 0X00AF0C04,
  88   /*    0X07AF0C08, 0X0CAF0C04, 0X01AF0C04, 0X0FAF0C04, */
  89         0X07AF0C08, 0X0CAF0C04, 0X01AF0C04, 0X0FAF0C08,
  90         0X0CAF0C04, 0X01AF0C04, 0X0FAF0C08, 0X0CAF0C04,
  91   /*    0X10AF0C04, 0XF0AFC000, 0XF3FF4805, 0XFFFFC005, */
  92         0X10AF0C04, 0XF0AFC000, 0XF3BF4805, 0XFFFFC005,
  93
  94         /* DRAM - single write. (offset 18 in upm RAM)
  95          */
  96         0xCFFF0004, 0x0FFF0404, 0x0CFF0C00, 0x13FF4804,
  97         0xFFFFC004, 0xFFFFC005, 0xFFFFC005, 0xFFFFC005,
  98
  99         /* DRAM - burst write. (offset 20 in upm RAM)
 100          */
 101         0xCFFF0004, 0x0FFF0404, 0x0CFF0C00, 0x03FF0C0C,
 102         0x0CFF0C00, 0x03FF0C0C, 0x0CFF0C00, 0x03FF0C0C,
 103         0x0CFF0C00, 0x13FF4804, 0xFFFFC004, 0xFFFFC005,
 104         0xFFFFC005, 0xFFFFC005, 0xFFFFC005, 0xFFFFC005,
 105
 106         /* refresh  (offset 30 in upm RAM)
 107          */
 108         0xFCFFC004, 0xC0FFC004, 0x01FFC004, 0x0FFFC004,
 109         0x1FFFC004, 0xFFFFC004, 0xFFFFC005, 0xFFFFC005,
 110         0xFFFFC005, 0xFFFFC005, 0xFFFFC005, 0xFFFFC005,
 111
 112         /* exception. (offset 3c in upm RAM)
 113          */
 114         0xFFFFC007, 0xFFFFC007, 0xFFFFC007, 0xFFFFC007,
 115 };
 116
 117 /* ------------------------------------------------------------------------- */
 118
 119 static unsigned int get_reffreq(void);
 120 static unsigned int board_get_cpufreq(void);
 121
 122 void mbx_init (void)
 123 {
 124         volatile immap_t *immr = (immap_t *) CFG_IMMR;
 125         volatile memctl8xx_t *memctl = &immr->im_memctl;
 126         ulong speed, refclock, plprcr, sccr;
 127         ulong br0_32 = memctl->memc_br0 & 0x400;
 128
 129         /* real-time clock status and control register */
 130         immr->im_sitk.sitk_rtcsck = KAPWR_KEY;
 131         immr->im_sit.sit_rtcsc = 0x00C3;
 132
 133         /* SIEL and SIMASK Registers (see MBX PRG 2-3) */
 134         immr->im_siu_conf.sc_simask = 0x00000000;
 135         immr->im_siu_conf.sc_siel = 0xAAAA0000;
 136         immr->im_siu_conf.sc_tesr = 0xFFFFFFFF;
 137
 138         /*
 139          * Prepare access to i2c bus. The MBX offers 3 devices on the i2c bus:
 140          * 1. Vital Product Data (contains clock speeds, MAC address etc, see vpd.h)
 141          * 2. RAM  Specs (see dimm.h)
 142          * 2. DIMM Specs (see dimm.h)
 143          */
 144         vpd_init ();
 145
 146         /* system clock and reset control register */
 147         immr->im_clkrstk.cark_sccrk = KAPWR_KEY;
 148         sccr = immr->im_clkrst.car_sccr;
 149         sccr &= SCCR_MASK;
 150         sccr |= CFG_SCCR;
 151         immr->im_clkrst.car_sccr = sccr;
 152
 153         speed = board_get_cpufreq ();
 154         refclock = get_reffreq ();
 155
 156 #if ((CFG_PLPRCR & PLPRCR_MF_MSK) != 0)
 157         plprcr = CFG_PLPRCR;
 158 #else
 159         plprcr = immr->im_clkrst.car_plprcr;
 160         plprcr &= PLPRCR_MF_MSK;        /* isolate MF field */
 161         plprcr |= CFG_PLPRCR;           /* reset control bits   */
 162 #endif
 163
 164 #ifdef CFG_USE_OSCCLK                   /* See doc/README.MBX ! */
 165         plprcr |= ((speed + refclock / 2) / refclock - 1) << 20;
 166 #endif
 167
 168         immr->im_clkrstk.cark_plprcrk = KAPWR_KEY;
 169         immr->im_clkrst.car_plprcr = plprcr;
 170
 171         /*
 172          * preliminary setup of memory controller:
 173          * - map Flash, otherwise configuration/status
 174          *    registers won't be accessible when read
 175          *    by board_init_f.
 176          * - map NVRAM and configuation/status registers.
 177          * - map pci registers.
 178          * - DON'T map ram yet, this is done in initdram().
 179          */
 180         switch (speed / 1000000) {
 181         case 40:
 182                 memctl->memc_br0 = 0xFE000000 | br0_32 | 1;
 183                 memctl->memc_or0 = 0xFF800930;
 184                 memctl->memc_or4 = CFG_NVRAM_OR | 0x920;
 185                 memctl->memc_br4 = CFG_NVRAM_BASE | 0x401;
 186                 break;
 187         case 50:
 188                 memctl->memc_br0 = 0xFE000000 | br0_32 | 1;
 189                 memctl->memc_or0 = 0xFF800940;
 190                 memctl->memc_or4 = CFG_NVRAM_OR | 0x930;
 191                 memctl->memc_br4 = CFG_NVRAM_BASE | 0x401;
 192                 break;
 193         default:
 194                 hang ();
 195                 break;
 196         }
 197 #ifdef CONFIG_USE_PCI
 198         memctl->memc_or5 = CFG_PCIMEM_OR;
 199         memctl->memc_br5 = CFG_PCIMEM_BASE | 0x001;
 200         memctl->memc_or6 = CFG_PCIBRIDGE_OR;
 201         memctl->memc_br6 = CFG_PCIBRIDGE_BASE | 0x001;
 202 #endif
 203         /*
 204          * FIXME: I do not understand why I have to call this to
 205          * initialise the control register here before booting from
 206          * the PCMCIA card but if I do not the Linux kernel falls
 207          * over in a big heap. If you can answer this question I
 208          * would like to know about it.
 209          */
 210         board_ether_init();
 211 }
 212
 213 void board_serial_init (void)
 214 {
 215         MBX_CSR1 &= ~(CSR1_COM1EN | CSR1_XCVRDIS);
 216 }
 217
 218 void board_ether_init (void)
 219 {
 220         MBX_CSR1 &= ~(CSR1_EAEN | CSR1_ELEN);
 221         MBX_CSR1 |= CSR1_ETEN | CSR1_TPEN | CSR1_FDDIS;
 222 }
 223
 224 static unsigned int board_get_cpufreq (void)
 225 {
 226 #ifndef CONFIG_8xx_GCLK_FREQ
 227         vpd_packet_t *packet;
 228
 229         packet = vpd_find_packet (VPD_PID_ICS);
 230         return *((ulong *) packet->data);
 231 #else
 232         return((unsigned int)CONFIG_8xx_GCLK_FREQ );
 233 #endif /* CONFIG_8xx_GCLK_FREQ */
 234 }
 235
 236 static unsigned int get_reffreq (void)
 237 {
 238         vpd_packet_t *packet;
 239
 240         packet = vpd_find_packet (VPD_PID_RCS);
 241         return *((ulong *) packet->data);
 242 }
 243
 244 void board_get_enetaddr (uchar * addr)
 245 {
 246         int i;
 247         vpd_packet_t *packet;
 248
 249         packet = vpd_find_packet (VPD_PID_EA);
 250         for (i = 0; i < 6; i++)
 251                 addr[i] = packet->data[i];
 252 }
 253
 254 /*
 255  * Check Board Identity:
 256  */
 257
 258 int checkboard (void)
 259 {
 260         vpd_packet_t *packet;
 261         int i;
 262         const char *const fmt =
 263                 "\n      *** Warning: Low Battery Status - %s Battery ***";
 264
 265         puts ("Board: ");
 266
 267         packet = vpd_find_packet (VPD_PID_PID);
 268         for (i = 0; i < packet->size; i++) {
 269                 serial_putc (packet->data[i]);
 270         }
 271         packet = vpd_find_packet (VPD_PID_MT);
 272         for (i = 0; i < packet->size; i++) {
 273                 serial_putc (packet->data[i]);
 274         }
 275         serial_putc ('(');
 276         packet = vpd_find_packet (VPD_PID_FAN);
 277         for (i = 0; i < packet->size; i++) {
 278                 serial_putc (packet->data[i]);
 279         }
 280         serial_putc (')');
 281
 282         if (!(MBX_CSR2 & SR2_BATGD))
 283                 printf (fmt, "On-Board");
 284         if (!(MBX_CSR2 & SR2_NVBATGD))
 285                 printf (fmt, "NVRAM");
 286
 287         serial_putc ('\n');
 288
 289         return (0);
 290 }
 291
 292 /* ------------------------------------------------------------------------- */
 293
 294 static ulong get_ramsize (dimm_t * dimm)
 295 {
 296         ulong size = 0;
 297
 298         if (dimm->fmt == 1 || dimm->fmt == 2 || dimm->fmt == 3
 299                 || dimm->fmt == 4) {
 300                 size = (1 << (dimm->n_row + dimm->n_col)) * dimm->n_banks *
 301                         ((dimm->data_w_hi << 8 | dimm->data_w_lo) / 8);
 302         }
 303
 304         return size;
 305 }
 306
 307 phys_size_t initdram (int board_type)
 308 {
 309         volatile immap_t *immap = (immap_t *) CFG_IMMR;
 310         volatile memctl8xx_t *memctl = &immap->im_memctl;
 311         unsigned long ram_sz = 0;
 312         unsigned long dimm_sz = 0;
 313         dimm_t vpd_dimm, vpd_dram;
 314         unsigned int speed = board_get_cpufreq () / 1000000;
 315
 316         if (vpd_read (0xa2, (uchar *) & vpd_dimm, sizeof (vpd_dimm), 0) > 0) {
 317                 dimm_sz = get_ramsize (&vpd_dimm);
 318         }
 319         if (vpd_read (0xa6, (uchar *) & vpd_dram, sizeof (vpd_dram), 0) > 0) {
 320                 ram_sz = get_ramsize (&vpd_dram);
 321         }
 322
 323         /*
 324          * Only initialize memory controller when running from FLASH.
 325          * When running from RAM, don't touch it.
 326          */
 327         if ((ulong) initdram & 0xff000000) {
 328                 ulong dimm_bank;
 329                 ulong br0_32 = memctl->memc_br0 & 0x400;
 330
 331                 switch (speed) {
 332                 case 40:
 333                         upmconfig (UPMA, (uint *) sdram_table_40,
 334                                            sizeof (sdram_table_40) / sizeof (uint));
 335                         memctl->memc_mptpr = 0x0200;
 336                         memctl->memc_mamr = dimm_sz ? 0x06801000 : 0x13801000;
 337                         memctl->memc_or7 = 0xff800930;
 338                         memctl->memc_br7 = 0xfc000000 | (br0_32 ^ br0_32) | 1;
 339                         break;
 340                 case 50:
 341                         upmconfig (UPMA, (uint *) sdram_table_50,
 342                                            sizeof (sdram_table_50) / sizeof (uint));
 343                         memctl->memc_mptpr = 0x0200;
 344                         memctl->memc_mamr = dimm_sz ? 0x08801000 : 0x1880100;
 345                         memctl->memc_or7 = 0xff800940;
 346                         memctl->memc_br7 = 0xfc000000 | (br0_32 ^ br0_32) | 1;
 347                         break;
 348                 default:
 349                         hang ();
 350                         break;
 351                 }
 352
 353                 /* now map ram and dimm, largest one first */
 354                 dimm_bank = dimm_sz / 2;
 355                 if (!dimm_sz) {
 356                         memctl->memc_or1 = ~(ram_sz - 1) | 0x400;
 357                         memctl->memc_br1 = CFG_SDRAM_BASE | 0x81;
 358                         memctl->memc_br2 = 0;
 359                         memctl->memc_br3 = 0;
 360                 } else if (ram_sz > dimm_bank) {
 361                         memctl->memc_or1 = ~(ram_sz - 1) | 0x400;
 362                         memctl->memc_br1 = CFG_SDRAM_BASE | 0x81;
 363                         memctl->memc_or2 = ~(dimm_bank - 1) | 0x400;
 364                         memctl->memc_br2 = (CFG_SDRAM_BASE + ram_sz) | 0x81;
 365                         memctl->memc_or3 = ~(dimm_bank - 1) | 0x400;
 366                         memctl->memc_br3 = (CFG_SDRAM_BASE + ram_sz + dimm_bank) \
 367                                                                      | 0x81;
 368                 } else {
 369                         memctl->memc_or2 = ~(dimm_bank - 1) | 0x400;
 370                         memctl->memc_br2 = CFG_SDRAM_BASE | 0x81;
 371                         memctl->memc_or3 = ~(dimm_bank - 1) | 0x400;
 372                         memctl->memc_br3 = (CFG_SDRAM_BASE + dimm_bank) | 0x81;
 373                         memctl->memc_or1 = ~(ram_sz - 1) | 0x400;
 374                         memctl->memc_br1 = (CFG_SDRAM_BASE + dimm_sz) | 0x81;
 375                 }
 376         }
 377
 378         return ram_sz + dimm_sz;
 379 }