board/freescale/common/cadmus.c

   1 /*
   2  * Copyright 2004, 2011 Freescale Semiconductor.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7
   8 #include <common.h>
   9
  10
  11 /*
  12  * CADMUS Board System Registers
  13  */
  14 #ifndef CONFIG_SYS_CADMUS_BASE_REG
  15 #define CONFIG_SYS_CADMUS_BASE_REG      (CADMUS_BASE_ADDR + 0x4000)
  16 #endif
  17
  18 typedef struct cadmus_reg {
  19     u_char cm_ver;              /* Board version */
  20     u_char cm_csr;              /* General control/status */
  21     u_char cm_rst;              /* Reset control */
  22     u_char cm_hsclk;            /* High speed clock */
  23     u_char cm_hsxclk;           /* High speed clock extended */
  24     u_char cm_led;              /* LED data */
  25     u_char cm_pci;              /* PCI control/status */
  26     u_char cm_dma;              /* DMA control */
  27     u_char cm_reserved[248];    /* Total 256 bytes */
  28 } cadmus_reg_t;
  29
  30
  31 unsigned int
  32 get_board_version(void)
  33 {
  34         volatile cadmus_reg_t *cadmus = (cadmus_reg_t *)CONFIG_SYS_CADMUS_BASE_REG;
  35
  36         return cadmus->cm_ver;
  37 }
  38
  39
  40 unsigned long
  41 get_clock_freq(void)
  42 {
  43         volatile cadmus_reg_t *cadmus = (cadmus_reg_t *)CONFIG_SYS_CADMUS_BASE_REG;
  44
  45         uint pci1_speed = (cadmus->cm_pci >> 2) & 0x3; /* PSPEED in [4:5] */
  46
  47         if (pci1_speed == 0) {
  48                 return 33333333;
  49         } else if (pci1_speed == 1) {
  50                 return 66666666;
  51         } else {
  52                 /* Really, unknown. Be safe? */
  53                 return 33333333;
  54         }
  55 }
  56
  57
  58 unsigned int
  59 get_pci_slot(void)
  60 {
  61         volatile cadmus_reg_t *cadmus = (cadmus_reg_t *)CONFIG_SYS_CADMUS_BASE_REG;
  62
  63         /*
  64          * PCI slot in USER bits CSR[6:7] by convention.
  65          */
  66         return ((cadmus->cm_csr >> 6) & 0x3) + 1;
  67 }
  68
  69
  70 unsigned int
  71 get_pci_dual(void)
  72 {
  73         volatile cadmus_reg_t *cadmus = (cadmus_reg_t *)CONFIG_SYS_CADMUS_BASE_REG;
  74
  75         /*
  76          * PCI DUAL in CM_PCI[3]
  77          */
  78         return cadmus->cm_pci & 0x10;
  79 }