forked from Minki/linux
74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
|
/*
|
||
|
|
* Joshua Henderson <joshua.henderson@microchip.com>
|
||
|
|
* Copyright (C) 2015 Microchip Technology Inc. All rights reserved.
|
||
|
|
*
|
||
|
|
* This program is free software; you can distribute it and/or modify it
|
||
|
|
* under the terms of the GNU General Public License (Version 2) as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
||
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||
|
|
* for more details.
|
||
|
|
*/
|
||
|
|
#include <linux/clk.h>
|
||
|
|
#include <linux/clk-provider.h>
|
||
|
|
#include <linux/clocksource.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/of.h>
|
||
|
|
#include <linux/of_irq.h>
|
||
|
|
#include <linux/irqdomain.h>
|
||
|
|
|
||
|
|
#include <asm/time.h>
|
||
|
|
|
||
|
|
#include "pic32mzda.h"
|
||
|
|
|
||
|
|
static const struct of_device_id pic32_infra_match[] = {
|
||
|
|
{ .compatible = "microchip,pic32mzda-infra", },
|
||
|
|
{ },
|
||
|
|
};
|
||
|
|
|
||
|
|
#define DEFAULT_CORE_TIMER_INTERRUPT 0
|
||
|
|
|
||
|
|
static unsigned int pic32_xlate_core_timer_irq(void)
|
||
|
|
{
|
||
|
|
static struct device_node *node;
|
||
|
|
unsigned int irq;
|
||
|
|
|
||
|
|
node = of_find_matching_node(NULL, pic32_infra_match);
|
||
|
|
|
||
|
|
if (WARN_ON(!node))
|
||
|
|
goto default_map;
|
||
|
|
|
||
|
|
irq = irq_of_parse_and_map(node, 0);
|
||
|
|
if (!irq)
|
||
|
|
goto default_map;
|
||
|
|
|
||
|
|
return irq;
|
||
|
|
|
||
|
|
default_map:
|
||
|
|
|
||
|
|
return irq_create_mapping(NULL, DEFAULT_CORE_TIMER_INTERRUPT);
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned int get_c0_compare_int(void)
|
||
|
|
{
|
||
|
|
return pic32_xlate_core_timer_irq();
|
||
|
|
}
|
||
|
|
|
||
|
|
void __init plat_time_init(void)
|
||
|
|
{
|
||
|
|
struct clk *clk;
|
||
|
|
|
||
|
|
of_clk_init(NULL);
|
||
|
|
clk = clk_get_sys("cpu_clk", NULL);
|
||
|
|
if (IS_ERR(clk))
|
||
|
|
panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
|
||
|
|
|
||
|
|
clk_prepare_enable(clk);
|
||
|
|
pr_info("CPU Clock: %ldMHz\n", clk_get_rate(clk) / 1000000);
|
||
|
|
mips_hpt_frequency = clk_get_rate(clk) / 2;
|
||
|
|
|
||
|
|
clocksource_probe();
|
||
|
|
}
|