LXR linux/arch/mips/netlogic/common/time.c

   1/*
   2 * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
   3 * reserved.
   4 *
   5 * This software is available to you under a choice of one of two
   6 * licenses.  You may choose to be licensed under the terms of the GNU
   7 * General Public License (GPL) Version 2, available from the file
   8 * COPYING in the main directory of this source tree, or the NetLogic
   9 * license below:
  10 *
  11 * Redistribution and use in source and binary forms, with or without
  12 * modification, are permitted provided that the following conditions
  13 * are met:
  14 *
  15 * 1. Redistributions of source code must retain the above copyright
  16 *    notice, this list of conditions and the following disclaimer.
  17 * 2. Redistributions in binary form must reproduce the above copyright
  18 *    notice, this list of conditions and the following disclaimer in
  19 *    the documentation and/or other materials provided with the
  20 *    distribution.
  21 *
  22 * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
  23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  24 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25 * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
  26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  31 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  32 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33 */
  34
  35#include <linux/init.h>
  36
  37#include <asm/time.h>
  38#include <asm/cpu-features.h>
  39
  40#include <asm/netlogic/interrupt.h>
  41#include <asm/netlogic/common.h>
  42#include <asm/netlogic/haldefs.h>
  43
  44#if defined(CONFIG_CPU_XLP)
  45#include <asm/netlogic/xlp-hal/iomap.h>
  46#include <asm/netlogic/xlp-hal/xlp.h>
  47#include <asm/netlogic/xlp-hal/sys.h>
  48#include <asm/netlogic/xlp-hal/pic.h>
  49#elif defined(CONFIG_CPU_XLR)
  50#include <asm/netlogic/xlr/iomap.h>
  51#include <asm/netlogic/xlr/pic.h>
  52#include <asm/netlogic/xlr/xlr.h>
  53#else
  54#error "Unknown CPU"
  55#endif
  56
  57unsigned int get_c0_compare_int(void)
  58{
  59        return IRQ_TIMER;
  60}
  61
  62static u64 nlm_get_pic_timer(struct clocksource *cs)
  63{
  64        uint64_t picbase = nlm_get_node(0)->picbase;
  65
  66        return ~nlm_pic_read_timer(picbase, PIC_CLOCK_TIMER);
  67}
  68
  69static u64 nlm_get_pic_timer32(struct clocksource *cs)
  70{
  71        uint64_t picbase = nlm_get_node(0)->picbase;
  72
  73        return ~nlm_pic_read_timer32(picbase, PIC_CLOCK_TIMER);
  74}
  75
  76static struct clocksource csrc_pic = {
  77        .name           = "PIC",
  78        .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
  79};
  80
  81static void nlm_init_pic_timer(void)
  82{
  83        uint64_t picbase = nlm_get_node(0)->picbase;
  84        u32 picfreq;
  85
  86        nlm_pic_set_timer(picbase, PIC_CLOCK_TIMER, ~0ULL, 0, 0);
  87        if (current_cpu_data.cputype == CPU_XLR) {
  88                csrc_pic.mask   = CLOCKSOURCE_MASK(32);
  89                csrc_pic.read   = nlm_get_pic_timer32;
  90        } else {
  91                csrc_pic.mask   = CLOCKSOURCE_MASK(64);
  92                csrc_pic.read   = nlm_get_pic_timer;
  93        }
  94        csrc_pic.rating = 1000;
  95        picfreq = pic_timer_freq();
  96        clocksource_register_hz(&csrc_pic, picfreq);
  97        pr_info("PIC clock source added, frequency %d\n", picfreq);
  98}
  99
 100void __init plat_time_init(void)
 101{
 102        nlm_init_pic_timer();
 103        mips_hpt_frequency = nlm_get_cpu_frequency();
 104        if (current_cpu_type() == CPU_XLR)
 105                preset_lpj = mips_hpt_frequency / (3 * HZ);
 106        else
 107                preset_lpj = mips_hpt_frequency / (2 * HZ);
 108        pr_info("MIPS counter frequency [%ld]\n",
 109                        (unsigned long)mips_hpt_frequency);
 110}
 111