cpu/mpc8260/speed.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 <mpc8260.h>
  26 #include <asm/processor.h>
  27
  28 #if defined(CONFIG_BOARD_GET_CPU_CLK_F)
  29 extern unsigned long board_get_cpu_clk_f (void);
  30 #endif
  31
  32 DECLARE_GLOBAL_DATA_PTR;
  33
  34 /* ------------------------------------------------------------------------- */
  35
  36 /* Bus-to-Core Multiplier */
  37 #define _1x     2
  38 #define _1_5x   3
  39 #define _2x     4
  40 #define _2_5x   5
  41 #define _3x     6
  42 #define _3_5x   7
  43 #define _4x     8
  44 #define _4_5x   9
  45 #define _5x     10
  46 #define _5_5x   11
  47 #define _6x     12
  48 #define _6_5x   13
  49 #define _7x     14
  50 #define _7_5x   15
  51 #define _8x     16
  52 #define _byp    -1
  53 #define _off    -2
  54 #define _unk    -3
  55
  56 typedef struct {
  57         int b2c_mult;
  58         int vco_div;
  59         char *freq_60x;
  60         char *freq_core;
  61 } corecnf_t;
  62
  63 /*
  64  * this table based on "Errata to MPC8260 PowerQUICC II User's Manual",
  65  * Rev. 1, 8/2000, page 10.
  66  */
  67 corecnf_t corecnf_tab[] = {
  68         { _1_5x,  4, " 33-100", " 33-100" },    /* 0x00 */
  69         {   _1x,  4, " 50-150", " 50-150" },    /* 0x01 */
  70         {   _1x,  8, " 25-75 ", " 25-75 " },    /* 0x02 */
  71         {  _byp, -1, "  ?-?  ", "  ?-?  " },    /* 0x03 */
  72         {   _2x,  2, " 50-150", "100-300" },    /* 0x04 */
  73         {   _2x,  4, " 25-75 ", " 50-150" },    /* 0x05 */
  74         { _2_5x,  2, " 40-120", "100-240" },    /* 0x06 */
  75         { _4_5x,  2, " 22-65 ", "100-300" },    /* 0x07 */
  76         {   _3x,  2, " 33-100", "100-300" },    /* 0x08 */
  77         { _5_5x,  2, " 18-55 ", "100-300" },    /* 0x09 */
  78         {   _4x,  2, " 25-75 ", "100-300" },    /* 0x0A */
  79         {   _5x,  2, " 20-60 ", "100-300" },    /* 0x0B */
  80         { _1_5x,  8, " 16-50 ", " 16-50 " },    /* 0x0C */
  81         {   _6x,  2, " 16-50 ", "100-300" },    /* 0x0D */
  82         { _3_5x,  2, " 30-85 ", "100-300" },    /* 0x0E */
  83         {  _off, -1, "  ?-?  ", "  ?-?  " },    /* 0x0F */
  84         {   _3x,  4, " 16-50 ", " 50-150" },    /* 0x10 */
  85         { _2_5x,  4, " 20-60 ", " 50-120" },    /* 0x11 */
  86         { _6_5x,  2, " 15-46 ", "100-300" },    /* 0x12 */
  87         {  _byp, -1, "  ?-?  ", "  ?-?  " },    /* 0x13 */
  88         {   _7x,  2, " 14-43 ", "100-300" },    /* 0x14 */
  89         {   _2x,  4, " 25-75 ", " 50-150" },    /* 0x15 */
  90         { _7_5x,  2, " 13-40 ", "100-300" },    /* 0x16 */
  91         { _4_5x,  2, " 22-65 ", "100-300" },    /* 0x17 */
  92         {  _unk, -1, "  ?-?  ", "  ?-?  " },    /* 0x18 */
  93         { _5_5x,  2, " 18-55 ", "100-300" },    /* 0x19 */
  94         {   _4x,  2, " 25-75 ", "100-300" },    /* 0x1A */
  95         {   _5x,  2, " 20-60 ", "100-300" },    /* 0x1B */
  96         {   _8x,  2, " 12-38 ", "100-300" },    /* 0x1C */
  97         {   _6x,  2, " 16-50 ", "100-300" },    /* 0x1D */
  98         { _3_5x,  2, " 30-85 ", "100-300" },    /* 0x1E */
  99         {  _off, -1, "  ?-?  ", "  ?-?  " },    /* 0x1F */
 100 };
 101
 102 /* ------------------------------------------------------------------------- */
 103
 104 /*
 105  *
 106  */
 107
 108 int get_clocks (void)
 109 {
 110         volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
 111         ulong clkin;
 112         ulong sccr, dfbrg;
 113         ulong scmr, corecnf, busdf, cpmdf, plldf, pllmf;
 114         corecnf_t *cp;
 115
 116 #if !defined(CONFIG_8260_CLKIN)
 117 #error clock measuring not implemented yet - define CONFIG_8260_CLKIN
 118 #else
 119 #if defined(CONFIG_BOARD_GET_CPU_CLK_F)
 120         clkin = board_get_cpu_clk_f ();
 121 #else
 122         clkin = CONFIG_8260_CLKIN;
 123 #endif
 124 #endif
 125
 126         sccr = immap->im_clkrst.car_sccr;
 127         dfbrg = (sccr & SCCR_DFBRG_MSK) >> SCCR_DFBRG_SHIFT;
 128
 129         scmr = immap->im_clkrst.car_scmr;
 130         corecnf = (scmr & SCMR_CORECNF_MSK) >> SCMR_CORECNF_SHIFT;
 131         cp = &corecnf_tab[corecnf];
 132
 133         busdf = (scmr & SCMR_BUSDF_MSK) >> SCMR_BUSDF_SHIFT;
 134         cpmdf = (scmr & SCMR_CPMDF_MSK) >> SCMR_CPMDF_SHIFT;
 135
 136         /* HiP7, HiP7 Rev01, HiP7 RevA */
 137         if ((get_pvr () == PVR_8260_HIP7) ||
 138             (get_pvr () == PVR_8260_HIP7R1) ||
 139             (get_pvr () == PVR_8260_HIP7RA)) {
 140                 pllmf = (scmr & SCMR_PLLMF_MSKH7) >> SCMR_PLLMF_SHIFT;
 141                 gd->vco_out = clkin * (pllmf + 1);
 142         } else {                        /* HiP3, HiP4 */
 143                 pllmf = (scmr & SCMR_PLLMF_MSK) >> SCMR_PLLMF_SHIFT;
 144                 plldf = (scmr & SCMR_PLLDF) ? 1 : 0;
 145                 gd->vco_out = (clkin * 2 * (pllmf + 1)) / (plldf + 1);
 146         }
 147 #if 0
 148         if (gd->vco_out / (busdf + 1) != clkin) {
 149                 /* aaarrrggghhh!!! */
 150                 return (1);
 151         }
 152 #endif
 153
 154         gd->cpm_clk = gd->vco_out / 2;
 155         gd->bus_clk = clkin;
 156         gd->scc_clk = gd->vco_out / 4;
 157         gd->brg_clk = gd->vco_out / (1 << (2 * (dfbrg + 1)));
 158
 159         if (cp->b2c_mult > 0) {
 160                 gd->cpu_clk = (clkin * cp->b2c_mult) / 2;
 161         } else {
 162                 gd->cpu_clk = clkin;
 163         }
 164
 165 #ifdef CONFIG_PCI
 166         gd->pci_clk = clkin;
 167
 168         if (sccr & SCCR_PCI_MODE) {
 169                 uint pci_div;
 170                 uint pcidf = (sccr & SCCR_PCIDF_MSK) >> SCCR_PCIDF_SHIFT;
 171
 172                 if (sccr & SCCR_PCI_MODCK) {
 173                         pci_div = 2;
 174                         if (pcidf == 9) {
 175                                 pci_div *= 5;
 176                         } else if (pcidf == 0xB) {
 177                                 pci_div *= 6;
 178                         } else {
 179                                 pci_div *= (pcidf + 1);
 180                         }
 181                 } else {
 182                         pci_div = pcidf + 1;
 183                 }
 184
 185                 gd->pci_clk = (gd->cpm_clk * 2) / pci_div;
 186         }
 187 #endif
 188
 189         return (0);
 190 }
 191
 192 int prt_8260_clks (void)
 193 {
 194         volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
 195         ulong sccr, dfbrg;
 196         ulong scmr, corecnf, busdf, cpmdf, plldf, pllmf, pcidf;
 197         corecnf_t *cp;
 198
 199         sccr = immap->im_clkrst.car_sccr;
 200         dfbrg = (sccr & SCCR_DFBRG_MSK) >> SCCR_DFBRG_SHIFT;
 201
 202         scmr = immap->im_clkrst.car_scmr;
 203         corecnf = (scmr & SCMR_CORECNF_MSK) >> SCMR_CORECNF_SHIFT;
 204         busdf = (scmr & SCMR_BUSDF_MSK) >> SCMR_BUSDF_SHIFT;
 205         cpmdf = (scmr & SCMR_CPMDF_MSK) >> SCMR_CPMDF_SHIFT;
 206         plldf = (scmr & SCMR_PLLDF) ? 1 : 0;
 207         pllmf = (scmr & SCMR_PLLMF_MSK) >> SCMR_PLLMF_SHIFT;
 208         pcidf = (sccr & SCCR_PCIDF_MSK) >> SCCR_PCIDF_SHIFT;
 209
 210         cp = &corecnf_tab[corecnf];
 211
 212         puts (CPU_ID_STR " Clock Configuration\n - Bus-to-Core Mult ");
 213
 214         switch (cp->b2c_mult) {
 215         case _byp:
 216                 puts ("BYPASS");
 217                 break;
 218
 219         case _off:
 220                 puts ("OFF");
 221                 break;
 222
 223         case _unk:
 224                 puts ("UNKNOWN");
 225                 break;
 226
 227         default:
 228                 printf ("%d%sx",
 229                         cp->b2c_mult / 2,
 230                         (cp->b2c_mult % 2) ? ".5" : "");
 231                 break;
 232         }
 233
 234         printf (", VCO Div %d, 60x Bus Freq %s, Core Freq %s\n",
 235                         cp->vco_div, cp->freq_60x, cp->freq_core);
 236
 237         printf (" - dfbrg %ld, corecnf 0x%02lx, busdf %ld, cpmdf %ld, "
 238                 "plldf %ld, pllmf %ld, pcidf %ld\n",
 239                         dfbrg, corecnf, busdf, cpmdf,
 240                         plldf, pllmf, pcidf);
 241
 242         printf (" - vco_out %10ld, scc_clk %10ld, brg_clk %10ld\n",
 243                         gd->vco_out, gd->scc_clk, gd->brg_clk);
 244
 245         printf (" - cpu_clk %10ld, cpm_clk %10ld, bus_clk %10ld\n",
 246                         gd->cpu_clk, gd->cpm_clk, gd->bus_clk);
 247 #ifdef CONFIG_PCI
 248         printf (" - pci_clk %10ld\n", gd->pci_clk);
 249 #endif
 250         putc ('\n');
 251
 252         return (0);
 253 }