]>
git.ipfire.org Git - people/ms/u-boot.git/blob - arch/arm/cpu/armv7/vf610/timer.c
2 * Copyright 2013 Freescale Semiconductor, Inc.
4 * SPDX-License-Identifier: GPL-2.0+
10 #include <asm/arch/imx-regs.h>
11 #include <asm/arch/clock.h>
13 static struct pit_reg
*cur_pit
= (struct pit_reg
*)PIT_BASE_ADDR
;
15 DECLARE_GLOBAL_DATA_PTR
;
17 #define TIMER_LOAD_VAL 0xffffffff
19 static inline unsigned long long tick_to_time(unsigned long long tick
)
21 tick
*= CONFIG_SYS_HZ
;
22 do_div(tick
, mxc_get_clock(MXC_IPG_CLK
));
27 static inline unsigned long long us_to_tick(unsigned long long usec
)
29 usec
= usec
* mxc_get_clock(MXC_IPG_CLK
) + 999999;
30 do_div(usec
, 1000000);
37 __raw_writel(0, &cur_pit
->mcr
);
39 __raw_writel(TIMER_LOAD_VAL
, &cur_pit
->ldval1
);
40 __raw_writel(0, &cur_pit
->tctrl1
);
41 __raw_writel(1, &cur_pit
->tctrl1
);
49 unsigned long long get_ticks(void)
51 ulong now
= TIMER_LOAD_VAL
- __raw_readl(&cur_pit
->cval1
);
53 /* increment tbu if tbl has rolled over */
54 if (now
< gd
->arch
.tbl
)
58 return (((unsigned long long)gd
->arch
.tbu
) << 32) | gd
->arch
.tbl
;
61 ulong
get_timer_masked(void)
63 return tick_to_time(get_ticks());
66 ulong
get_timer(ulong base
)
68 return get_timer_masked() - base
;
71 /* delay x useconds AND preserve advance timstamp value */
72 void __udelay(unsigned long usec
)
74 unsigned long long start
;
77 start
= get_ticks(); /* get current timestamp */
78 tmo
= us_to_tick(usec
); /* convert usecs to ticks */
79 while ((get_ticks() - start
) < tmo
)
80 ; /* loop till time has passed */
84 * This function is derived from PowerPC code (timebase clock frequency).
85 * On ARM it returns the number of timer ticks per second.
89 return mxc_get_clock(MXC_IPG_CLK
);