board/freescale/common/cadmus.c

   1 /*
   2  * Copyright 2004, 2011 Freescale Semiconductor.
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA 02111-1307 USA
  21  */
  22
  23
  24 #include <common.h>
  25
  26
  27 /*
  28  * CADMUS Board System Registers
  29  */
  30 #ifndef CONFIG_SYS_CADMUS_BASE_REG
  31 #define CONFIG_SYS_CADMUS_BASE_REG      (CADMUS_BASE_ADDR + 0x4000)
  32 #endif
  33
  34 typedef struct cadmus_reg {
  35     u_char cm_ver;              /* Board version */
  36     u_char cm_csr;              /* General control/status */
  37     u_char cm_rst;              /* Reset control */
  38     u_char cm_hsclk;            /* High speed clock */
  39     u_char cm_hsxclk;           /* High speed clock extended */
  40     u_char cm_led;              /* LED data */
  41     u_char cm_pci;              /* PCI control/status */
  42     u_char cm_dma;              /* DMA control */
  43     u_char cm_reserved[248];    /* Total 256 bytes */
  44 } cadmus_reg_t;
  45
  46
  47 unsigned int
  48 get_board_version(void)
  49 {
  50         volatile cadmus_reg_t *cadmus = (cadmus_reg_t *)CONFIG_SYS_CADMUS_BASE_REG;
  51
  52         return cadmus->cm_ver;
  53 }
  54
  55
  56 unsigned long
  57 get_clock_freq(void)
  58 {
  59         volatile cadmus_reg_t *cadmus = (cadmus_reg_t *)CONFIG_SYS_CADMUS_BASE_REG;
  60
  61         uint pci1_speed = (cadmus->cm_pci >> 2) & 0x3; /* PSPEED in [4:5] */
  62
  63         if (pci1_speed == 0) {
  64                 return 33333333;
  65         } else if (pci1_speed == 1) {
  66                 return 66666666;
  67         } else {
  68                 /* Really, unknown. Be safe? */
  69                 return 33333333;
  70         }
  71 }
  72
  73
  74 unsigned int
  75 get_pci_slot(void)
  76 {
  77         volatile cadmus_reg_t *cadmus = (cadmus_reg_t *)CONFIG_SYS_CADMUS_BASE_REG;
  78
  79         /*
  80          * PCI slot in USER bits CSR[6:7] by convention.
  81          */
  82         return ((cadmus->cm_csr >> 6) & 0x3) + 1;
  83 }
  84
  85
  86 unsigned int
  87 get_pci_dual(void)
  88 {
  89         volatile cadmus_reg_t *cadmus = (cadmus_reg_t *)CONFIG_SYS_CADMUS_BASE_REG;
  90
  91         /*
  92          * PCI DUAL in CM_PCI[3]
  93          */
  94         return cadmus->cm_pci & 0x10;
  95 }