LXR uboot/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
  34typedef 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
  47unsigned int
  48get_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
  56unsigned long
  57get_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
  74unsigned int
  75get_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
  86unsigned int
  87get_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}
  96