LXR linux/arch/mips/cavium-octeon/executive/cvmx-sysinfo.c

   1/***********************license start***************
   2 * Author: Cavium Networks
   3 *
   4 * Contact: support@caviumnetworks.com
   5 * This file is part of the OCTEON SDK
   6 *
   7 * Copyright (c) 2003-2008 Cavium Networks
   8 *
   9 * This file is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License, Version 2, as
  11 * published by the Free Software Foundation.
  12 *
  13 * This file is distributed in the hope that it will be useful, but
  14 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
  15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
  16 * NONINFRINGEMENT.  See the GNU General Public License for more
  17 * details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this file; if not, write to the Free Software
  21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  22 * or visit http://www.gnu.org/licenses/.
  23 *
  24 * This file may also be available under a different license from Cavium.
  25 * Contact Cavium Networks for more information
  26 ***********************license end**************************************/
  27
  28/*
  29 * This module provides system/board/application information obtained
  30 * by the bootloader.
  31 */
  32#include <linux/module.h>
  33
  34#include <asm/octeon/cvmx.h>
  35#include <asm/octeon/cvmx-spinlock.h>
  36#include <asm/octeon/cvmx-sysinfo.h>
  37
  38/**
  39 * This structure defines the private state maintained by sysinfo module.
  40 *
  41 */
  42static struct {
  43        struct cvmx_sysinfo sysinfo;       /* system information */
  44        cvmx_spinlock_t lock;      /* mutex spinlock */
  45
  46} state = {
  47        .lock = CVMX_SPINLOCK_UNLOCKED_INITIALIZER
  48};
  49
  50
  51/*
  52 * Global variables that define the min/max of the memory region set
  53 * up for 32 bit userspace access.
  54 */
  55uint64_t linux_mem32_min;
  56uint64_t linux_mem32_max;
  57uint64_t linux_mem32_wired;
  58uint64_t linux_mem32_offset;
  59
  60/**
  61 * This function returns the application information as obtained
  62 * by the bootloader.  This provides the core mask of the cores
  63 * running the same application image, as well as the physical
  64 * memory regions available to the core.
  65 *
  66 * Returns  Pointer to the boot information structure
  67 *
  68 */
  69struct cvmx_sysinfo *cvmx_sysinfo_get(void)
  70{
  71        return &(state.sysinfo);
  72}
  73EXPORT_SYMBOL(cvmx_sysinfo_get);
  74
  75/**
  76 * This function is used in non-simple executive environments (such as
  77 * Linux kernel, u-boot, etc.)  to configure the minimal fields that
  78 * are required to use simple executive files directly.
  79 *
  80 * Locking (if required) must be handled outside of this
  81 * function
  82 *
  83 * @phy_mem_desc_ptr:
  84 *                   Pointer to global physical memory descriptor
  85 *                   (bootmem descriptor) @board_type: Octeon board
  86 *                   type enumeration
  87 *
  88 * @board_rev_major:
  89 *                   Board major revision
  90 * @board_rev_minor:
  91 *                   Board minor revision
  92 * @cpu_clock_hz:
  93 *                   CPU clock freqency in hertz
  94 *
  95 * Returns 0: Failure
  96 *         1: success
  97 */
  98int cvmx_sysinfo_minimal_initialize(void *phy_mem_desc_ptr,
  99                                    uint16_t board_type,
 100                                    uint8_t board_rev_major,
 101                                    uint8_t board_rev_minor,
 102                                    uint32_t cpu_clock_hz)
 103{
 104
 105        /* The sysinfo structure was already initialized */
 106        if (state.sysinfo.board_type)
 107                return 0;
 108
 109        memset(&(state.sysinfo), 0x0, sizeof(state.sysinfo));
 110        state.sysinfo.phy_mem_desc_ptr = phy_mem_desc_ptr;
 111        state.sysinfo.board_type = board_type;
 112        state.sysinfo.board_rev_major = board_rev_major;
 113        state.sysinfo.board_rev_minor = board_rev_minor;
 114        state.sysinfo.cpu_clock_hz = cpu_clock_hz;
 115
 116        return 1;
 117}
 118
 119