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Linux/arch/mips/cobalt/time.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  *  Cobalt time initialization.
  4  *
  5  *  Copyright (C) 2007  Yoichi Yuasa <yuasa@linux-mips.org>
  6  */
  7 #include <linux/i8253.h>
  8 #include <linux/init.h>
  9 
 10 #include <asm/gt64120.h>
 11 #include <asm/time.h>
 12 
 13 #define GT641XX_BASE_CLOCK      50000000        /* 50MHz */
 14 
 15 void __init plat_time_init(void)
 16 {
 17         u32 start, end;
 18         int i = HZ / 10;
 19 
 20         setup_pit_timer();
 21 
 22         gt641xx_set_base_clock(GT641XX_BASE_CLOCK);
 23 
 24         /*
 25          * MIPS counter frequency is measured during a 100msec interval
 26          * using GT64111 timer0.
 27          */
 28         while (!gt641xx_timer0_state())
 29                 ;
 30 
 31         start = read_c0_count();
 32 
 33         while (i--)
 34                 while (!gt641xx_timer0_state())
 35                         ;
 36 
 37         end = read_c0_count();
 38 
 39         mips_hpt_frequency = (end - start) * 10;
 40         printk(KERN_INFO "MIPS counter frequency %dHz\n", mips_hpt_frequency);
 41 }
 42 

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