arch/ppc/cpu/mpc8xx/cpu_init.c

   1 /*
   2  * (C) Copyright 2000-2002
   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 <watchdog.h>
  26
  27 #include <mpc8xx.h>
  28 #include <commproc.h>
  29
  30 #if defined(CONFIG_SYS_RTCSC) || defined(CONFIG_SYS_RMDS)
  31 DECLARE_GLOBAL_DATA_PTR;
  32 #endif
  33
  34 #if defined(CONFIG_SYS_I2C_UCODE_PATCH) || defined(CONFIG_SYS_SPI_UCODE_PATCH) || \
  35     defined(CONFIG_SYS_SMC_UCODE_PATCH)
  36 void cpm_load_patch (volatile immap_t * immr);
  37 #endif
  38
  39 /*
  40  * Breath some life into the CPU...
  41  *
  42  * Set up the memory map,
  43  * initialize a bunch of registers,
  44  * initialize the UPM's
  45  */
  46 void cpu_init_f (volatile immap_t * immr)
  47 {
  48 #ifndef CONFIG_MBX
  49         volatile memctl8xx_t *memctl = &immr->im_memctl;
  50 # ifdef CONFIG_SYS_PLPRCR
  51         ulong mfmask;
  52 # endif
  53 #endif
  54         ulong reg;
  55
  56         /* SYPCR - contains watchdog control (11-9) */
  57
  58         immr->im_siu_conf.sc_sypcr = CONFIG_SYS_SYPCR;
  59
  60 #if defined(CONFIG_WATCHDOG)
  61         reset_8xx_watchdog (immr);
  62 #endif /* CONFIG_WATCHDOG */
  63
  64         /* SIUMCR - contains debug pin configuration (11-6) */
  65 #ifndef CONFIG_SVM_SC8xx
  66         immr->im_siu_conf.sc_siumcr |= CONFIG_SYS_SIUMCR;
  67 #else
  68         immr->im_siu_conf.sc_siumcr = CONFIG_SYS_SIUMCR;
  69 #endif
  70         /* initialize timebase status and control register (11-26) */
  71         /* unlock TBSCRK */
  72
  73         immr->im_sitk.sitk_tbscrk = KAPWR_KEY;
  74         immr->im_sit.sit_tbscr = CONFIG_SYS_TBSCR;
  75
  76         /* initialize the PIT (11-31) */
  77
  78         immr->im_sitk.sitk_piscrk = KAPWR_KEY;
  79         immr->im_sit.sit_piscr = CONFIG_SYS_PISCR;
  80
  81         /* System integration timers. Don't change EBDF! (15-27) */
  82
  83         immr->im_clkrstk.cark_sccrk = KAPWR_KEY;
  84         reg = immr->im_clkrst.car_sccr;
  85         reg &= SCCR_MASK;
  86         reg |= CONFIG_SYS_SCCR;
  87         immr->im_clkrst.car_sccr = reg;
  88
  89         /* PLL (CPU clock) settings (15-30) */
  90
  91         immr->im_clkrstk.cark_plprcrk = KAPWR_KEY;
  92
  93 #ifndef CONFIG_MBX              /* MBX board does things different */
  94
  95         /* If CONFIG_SYS_PLPRCR (set in the various *_config.h files) tries to
  96          * set the MF field, then just copy CONFIG_SYS_PLPRCR over car_plprcr,
  97          * otherwise OR in CONFIG_SYS_PLPRCR so we do not change the current MF
  98          * field value.
  99          *
 100          * For newer (starting MPC866) chips PLPRCR layout is different.
 101          */
 102 #ifdef CONFIG_SYS_PLPRCR
 103         if (get_immr(0xFFFF) >= MPC8xx_NEW_CLK)
 104            mfmask = PLPRCR_MFACT_MSK;
 105         else
 106            mfmask = PLPRCR_MF_MSK;
 107
 108         if ((CONFIG_SYS_PLPRCR & mfmask) != 0)
 109            reg = CONFIG_SYS_PLPRCR;                     /* reset control bits   */
 110         else {
 111            reg = immr->im_clkrst.car_plprcr;
 112            reg &= mfmask;                       /* isolate MF-related fields */
 113            reg |= CONFIG_SYS_PLPRCR;                    /* reset control bits   */
 114         }
 115         immr->im_clkrst.car_plprcr = reg;
 116 #endif
 117
 118         /*
 119          * Memory Controller:
 120          */
 121
 122         /* perform BR0 reset that MPC850 Rev. A can't guarantee */
 123         reg = memctl->memc_br0;
 124         reg &= BR_PS_MSK;       /* Clear everything except Port Size bits */
 125         reg |= BR_V;            /* then add just the "Bank Valid" bit     */
 126         memctl->memc_br0 = reg;
 127
 128         /* Map banks 0 (and maybe 1) to the FLASH banks 0 (and 1) at
 129          * preliminary addresses - these have to be modified later
 130          * when FLASH size has been determined
 131          *
 132          * Depending on the size of the memory region defined by
 133          * CONFIG_SYS_OR0_REMAP some boards (wide address mask) allow to map the
 134          * CONFIG_SYS_MONITOR_BASE, while others (narrower address mask) can't
 135          * map CONFIG_SYS_MONITOR_BASE.
 136          *
 137          * For example, for CONFIG_IVMS8, the CONFIG_SYS_MONITOR_BASE is
 138          * 0xff000000, but CONFIG_SYS_OR0_REMAP's address mask is 0xfff80000.
 139          *
 140          * If BR0 wasn't loaded with address base 0xff000000, then BR0's
 141          * base address remains as 0x00000000. However, the address mask
 142          * have been narrowed to 512Kb, so CONFIG_SYS_MONITOR_BASE wasn't mapped
 143          * into the Bank0.
 144          *
 145          * This is why CONFIG_IVMS8 and similar boards must load BR0 with
 146          * CONFIG_SYS_BR0_PRELIM in advance.
 147          *
 148          * [Thanks to Michael Liao for this explanation.
 149          *  I owe him a free beer. - wd]
 150          */
 151
 152 #if defined(CONFIG_GTH)         || \
 153     defined(CONFIG_HERMES)      || \
 154     defined(CONFIG_ICU862)      || \
 155     defined(CONFIG_IP860)       || \
 156     defined(CONFIG_IVML24)      || \
 157     defined(CONFIG_IVMS8)       || \
 158     defined(CONFIG_LWMON)       || \
 159     defined(CONFIG_MHPC)        || \
 160     defined(CONFIG_PCU_E)       || \
 161     defined(CONFIG_R360MPI)     || \
 162     defined(CONFIG_RMU)         || \
 163     defined(CONFIG_RPXCLASSIC)  || \
 164     defined(CONFIG_RPXLITE)     || \
 165     defined(CONFIG_SPC1920)     || \
 166     defined(CONFIG_SPD823TS)
 167
 168         memctl->memc_br0 = CONFIG_SYS_BR0_PRELIM;
 169 #endif
 170
 171 #if defined(CONFIG_SYS_OR0_REMAP)
 172         memctl->memc_or0 = CONFIG_SYS_OR0_REMAP;
 173 #endif
 174 #if defined(CONFIG_SYS_OR1_REMAP)
 175         memctl->memc_or1 = CONFIG_SYS_OR1_REMAP;
 176 #endif
 177 #if defined(CONFIG_SYS_OR5_REMAP)
 178         memctl->memc_or5 = CONFIG_SYS_OR5_REMAP;
 179 #endif
 180
 181         /* now restrict to preliminary range */
 182         memctl->memc_br0 = CONFIG_SYS_BR0_PRELIM;
 183         memctl->memc_or0 = CONFIG_SYS_OR0_PRELIM;
 184
 185 #if (defined(CONFIG_SYS_OR1_PRELIM) && defined(CONFIG_SYS_BR1_PRELIM))
 186         memctl->memc_or1 = CONFIG_SYS_OR1_PRELIM;
 187         memctl->memc_br1 = CONFIG_SYS_BR1_PRELIM;
 188 #endif
 189
 190 #if defined(CONFIG_IP860) /* disable CS0 now that Flash is mapped on CS1 */
 191         memctl->memc_br0 = 0;
 192 #endif
 193
 194 #if defined(CONFIG_SYS_OR2_PRELIM) && defined(CONFIG_SYS_BR2_PRELIM)
 195         memctl->memc_or2 = CONFIG_SYS_OR2_PRELIM;
 196         memctl->memc_br2 = CONFIG_SYS_BR2_PRELIM;
 197 #endif
 198
 199 #if defined(CONFIG_SYS_OR3_PRELIM) && defined(CONFIG_SYS_BR3_PRELIM)
 200         memctl->memc_or3 = CONFIG_SYS_OR3_PRELIM;
 201         memctl->memc_br3 = CONFIG_SYS_BR3_PRELIM;
 202 #endif
 203
 204 #if defined(CONFIG_SYS_OR4_PRELIM) && defined(CONFIG_SYS_BR4_PRELIM)
 205         memctl->memc_or4 = CONFIG_SYS_OR4_PRELIM;
 206         memctl->memc_br4 = CONFIG_SYS_BR4_PRELIM;
 207 #endif
 208
 209 #if defined(CONFIG_SYS_OR5_PRELIM) && defined(CONFIG_SYS_BR5_PRELIM)
 210         memctl->memc_or5 = CONFIG_SYS_OR5_PRELIM;
 211         memctl->memc_br5 = CONFIG_SYS_BR5_PRELIM;
 212 #endif
 213
 214 #if defined(CONFIG_SYS_OR6_PRELIM) && defined(CONFIG_SYS_BR6_PRELIM)
 215         memctl->memc_or6 = CONFIG_SYS_OR6_PRELIM;
 216         memctl->memc_br6 = CONFIG_SYS_BR6_PRELIM;
 217 #endif
 218
 219 #if defined(CONFIG_SYS_OR7_PRELIM) && defined(CONFIG_SYS_BR7_PRELIM)
 220         memctl->memc_or7 = CONFIG_SYS_OR7_PRELIM;
 221         memctl->memc_br7 = CONFIG_SYS_BR7_PRELIM;
 222 #endif
 223
 224 #endif /* ! CONFIG_MBX */
 225
 226         /*
 227          * Reset CPM
 228          */
 229         immr->im_cpm.cp_cpcr = CPM_CR_RST | CPM_CR_FLG;
 230         do {                    /* Spin until command processed     */
 231                 __asm__ ("eieio");
 232         } while (immr->im_cpm.cp_cpcr & CPM_CR_FLG);
 233
 234 #ifdef CONFIG_MBX
 235         /*
 236          * on the MBX, things are a little bit different:
 237          * - we need to read the VPD to get board information
 238          * - the plprcr is set up dynamically
 239          * - the memory controller is set up dynamically
 240          */
 241         mbx_init ();
 242 #endif /* CONFIG_MBX */
 243
 244 #ifdef CONFIG_RPXCLASSIC
 245         rpxclassic_init ();
 246 #endif
 247
 248 #if defined(CONFIG_RPXLITE) && defined(CONFIG_ENV_IS_IN_NVRAM)
 249         rpxlite_init ();
 250 #endif
 251
 252 #ifdef CONFIG_SYS_RCCR                  /* must be done before cpm_load_patch() */
 253         /* write config value */
 254         immr->im_cpm.cp_rccr = CONFIG_SYS_RCCR;
 255 #endif
 256
 257 #if defined(CONFIG_SYS_I2C_UCODE_PATCH) || defined(CONFIG_SYS_SPI_UCODE_PATCH) || \
 258     defined(CONFIG_SYS_SMC_UCODE_PATCH)
 259         cpm_load_patch (immr);  /* load mpc8xx  microcode patch */
 260 #endif
 261 }
 262
 263 /*
 264  * initialize higher level parts of CPU like timers
 265  */
 266 int cpu_init_r (void)
 267 {
 268 #if defined(CONFIG_SYS_RTCSC) || defined(CONFIG_SYS_RMDS)
 269         bd_t *bd = gd->bd;
 270         volatile immap_t *immr = (volatile immap_t *) (bd->bi_immr_base);
 271 #endif
 272
 273 #ifdef CONFIG_SYS_RTCSC
 274         /* Unlock RTSC register */
 275         immr->im_sitk.sitk_rtcsck = KAPWR_KEY;
 276         /* write config value */
 277         immr->im_sit.sit_rtcsc = CONFIG_SYS_RTCSC;
 278 #endif
 279
 280 #ifdef CONFIG_SYS_RMDS
 281         /* write config value */
 282         immr->im_cpm.cp_rmds = CONFIG_SYS_RMDS;
 283 #endif
 284         return (0);
 285 }