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git.ipfire.org Git - people/ms/u-boot.git/blob - cpu/sh2/time.c
2 * Copyright (C) 2007,2008 Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
3 * Copyright (C) 2008 Renesas Solutions Corp.
6 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
8 * See file CREDITS for list of people who contributed to this
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of
14 * the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 #include <asm/processor.h>
31 #define CMT_CMCSR_INIT 0x0001 /* PCLK/32 */
32 #define CMT_CMCSR_CALIB 0x0000
33 #define CMT_MAX_COUNTER (0xFFFFFFFF)
34 #define CMT_TIMER_RESET (0xFFFF)
36 static vu_long cmt0_timer
;
38 static void cmt_timer_start(unsigned int timer
)
40 writew(readw(CMSTR
) | 0x01, CMSTR
);
43 static void cmt_timer_stop(unsigned int timer
)
45 writew(readw(CMSTR
) & ~0x01, CMSTR
);
51 /* Divide clock by 32 */
53 writew(CMT_CMCSR_INIT
, CMCSR_0
);
55 /* User Device 0 only */
57 set_timer(CMT_TIMER_RESET
);
63 unsigned long long get_ticks(void)
69 ulong
get_timer(ulong base
)
71 ulong data
= readw(CMCNT_0
);
76 cmcnt
= (CMT_TIMER_RESET
- cmcnt
) + data
;
78 if ((cmt0_timer
+ cmcnt
) > CMT_MAX_COUNTER
)
79 cmt0_timer
= ((cmt0_timer
+ cmcnt
) - CMT_MAX_COUNTER
);
84 return cmt0_timer
- base
;
87 void set_timer(ulong t
)
89 writew((u16
) t
, CMCOR_0
);
92 void reset_timer(void)
95 set_timer(CMT_TIMER_RESET
);
100 void udelay(unsigned long usec
)
102 unsigned int start
= get_timer(0);
104 while (get_timer((ulong
) start
) < (usec
* (CFG_HZ
/ 1000000)))
108 unsigned long get_tbclk(void)