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
  57 unsigned int get_c0_compare_int(void)
  58 {
  59         return IRQ_TIMER;
  60 }
  61
  62 static 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
  69 static 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
  76 static struct clocksource csrc_pic = {
  77         .name           = "PIC",
  78         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
  79 };
  80
  81 static 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
 100 void __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 }