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1dda0b1f WD |
1 | /* |
2 | * (C) Copyright 2000, 2001 | |
3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
4 | * | |
1a459660 | 5 | * SPDX-License-Identifier: GPL-2.0+ |
1dda0b1f WD |
6 | */ |
7 | ||
8 | #include <common.h> | |
9 | ||
1dda0b1f WD |
10 | /* ------------------------------------------------------------------------- */ |
11 | ||
12 | /* | |
13 | * This function is intended for SHORT delays only. | |
14 | * It will overflow at around 10 seconds @ 400MHz, | |
15 | * or 20 seconds @ 200MHz. | |
16 | */ | |
17 | unsigned long usec2ticks(unsigned long usec) | |
18 | { | |
19 | ulong ticks; | |
20 | ||
21 | if (usec < 1000) { | |
22 | ticks = ((usec * (get_tbclk()/1000)) + 500) / 1000; | |
23 | } else { | |
24 | ticks = ((usec / 10) * (get_tbclk() / 100000)); | |
25 | } | |
26 | ||
27 | return (ticks); | |
28 | } | |
29 | ||
30 | /* ------------------------------------------------------------------------- */ | |
31 | ||
32 | /* | |
33 | * We implement the delay by converting the delay (the number of | |
34 | * microseconds to wait) into a number of time base ticks; then we | |
35 | * watch the time base until it has incremented by that amount. | |
36 | */ | |
3eb90bad | 37 | void __udelay(unsigned long usec) |
1dda0b1f | 38 | { |
3eb90bad IL |
39 | ulong ticks = usec2ticks (usec); |
40 | wait_ticks (ticks); | |
1dda0b1f WD |
41 | } |
42 | ||
43 | /* ------------------------------------------------------------------------- */ | |
e4c09508 | 44 | #ifndef CONFIG_NAND_SPL |
1dda0b1f WD |
45 | unsigned long ticks2usec(unsigned long ticks) |
46 | { | |
47 | ulong tbclk = get_tbclk(); | |
48 | ||
49 | /* usec = ticks * 1000000 / tbclk | |
50 | * Multiplication would overflow at ~4.2e3 ticks, | |
51 | * so we break it up into | |
52 | * usec = ( ( ticks * 1000) / tbclk ) * 1000; | |
53 | */ | |
54 | ticks *= 1000L; | |
55 | ticks /= tbclk; | |
56 | ticks *= 1000L; | |
57 | ||
58 | return ((ulong)ticks); | |
59 | } | |
e4c09508 | 60 | #endif |
1dda0b1f WD |
61 | /* ------------------------------------------------------------------------- */ |
62 | ||
70e2aaf3 | 63 | int timer_init(void) |
1dda0b1f | 64 | { |
96805a52 TT |
65 | unsigned long temp; |
66 | ||
907208c4 CL |
67 | #if defined(CONFIG_8xx) |
68 | volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; | |
69 | ||
70 | /* unlock */ | |
71 | immap->im_sitk.sitk_tbk = KAPWR_KEY; | |
72 | #endif | |
73 | ||
1dda0b1f | 74 | /* reset */ |
96805a52 TT |
75 | asm volatile("li %0,0 ; mttbu %0 ; mttbl %0;" |
76 | : "=&r"(temp) ); | |
1dda0b1f | 77 | |
907208c4 CL |
78 | #if defined(CONFIG_8xx) |
79 | /* enable */ | |
80 | immap->im_sit.sit_tbscr |= TBSCR_TBE; | |
81 | #endif | |
1dda0b1f WD |
82 | return (0); |
83 | } | |
84 | /* ------------------------------------------------------------------------- */ |