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570c0186 | 1 | /* |
a4110eec | 2 | * (C) Copyright 2007, 2012 Freescale Semiconductor, Inc. |
570c0186 TL |
3 | * TsiChung Liew (Tsi-Chung.Liew@freescale.com) |
4 | * | |
5 | * See file CREDITS for list of people who contributed to this | |
6 | * project. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License as | |
10 | * published by the Free Software Foundation; either version 2 of | |
11 | * the License, or (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
21 | * MA 02111-1307 USA | |
22 | */ | |
23 | ||
24 | #include <common.h> | |
25 | ||
26 | #include <asm/timer.h> | |
27 | #include <asm/immap.h> | |
a4110eec | 28 | #include <asm/io.h> |
570c0186 TL |
29 | |
30 | DECLARE_GLOBAL_DATA_PTR; | |
31 | ||
32 | static ulong timestamp; | |
33 | ||
34 | #if defined(CONFIG_SLTTMR) | |
6d0f6bcf | 35 | #ifndef CONFIG_SYS_UDELAY_BASE |
570c0186 TL |
36 | # error "uDelay base not defined!" |
37 | #endif | |
38 | ||
6d0f6bcf | 39 | #if !defined(CONFIG_SYS_TMR_BASE) || !defined(CONFIG_SYS_INTR_BASE) || !defined(CONFIG_SYS_TMRINTR_NO) || !defined(CONFIG_SYS_TMRINTR_MASK) |
570c0186 TL |
40 | # error "TMR_BASE, INTR_BASE, TMRINTR_NO or TMRINTR_MASk not defined!" |
41 | #endif | |
42 | extern void dtimer_intr_setup(void); | |
43 | ||
3eb90bad | 44 | void __udelay(unsigned long usec) |
570c0186 | 45 | { |
a4110eec | 46 | slt_t *timerp = (slt_t *) (CONFIG_SYS_UDELAY_BASE); |
570c0186 TL |
47 | u32 now, freq; |
48 | ||
49 | /* 1 us period */ | |
6d0f6bcf | 50 | freq = CONFIG_SYS_TIMER_PRESCALER; |
570c0186 | 51 | |
a4110eec AW |
52 | /* Disable */ |
53 | out_be32(&timerp->cr, 0); | |
54 | out_be32(&timerp->tcnt, usec * freq); | |
55 | out_be32(&timerp->cr, SLT_CR_TEN); | |
570c0186 | 56 | |
a4110eec | 57 | now = in_be32(&timerp->cnt); |
570c0186 | 58 | while (now != 0) |
a4110eec | 59 | now = in_be32(&timerp->cnt); |
570c0186 | 60 | |
a4110eec AW |
61 | setbits_be32(&timerp->sr, SLT_SR_ST); |
62 | out_be32(&timerp->cr, 0); | |
570c0186 TL |
63 | } |
64 | ||
65 | void dtimer_interrupt(void *not_used) | |
66 | { | |
a4110eec | 67 | slt_t *timerp = (slt_t *) (CONFIG_SYS_TMR_BASE); |
570c0186 TL |
68 | |
69 | /* check for timer interrupt asserted */ | |
6d0f6bcf | 70 | if ((CONFIG_SYS_TMRPND_REG & CONFIG_SYS_TMRINTR_MASK) == CONFIG_SYS_TMRINTR_PEND) { |
a4110eec | 71 | setbits_be32(&timerp->sr, SLT_SR_ST); |
570c0186 TL |
72 | timestamp++; |
73 | return; | |
74 | } | |
75 | } | |
76 | ||
444ddfc7 | 77 | int timer_init(void) |
570c0186 | 78 | { |
a4110eec | 79 | slt_t *timerp = (slt_t *) (CONFIG_SYS_TMR_BASE); |
570c0186 TL |
80 | |
81 | timestamp = 0; | |
82 | ||
a4110eec AW |
83 | /* disable timer */ |
84 | out_be32(&timerp->cr, 0); | |
85 | out_be32(&timerp->tcnt, 0); | |
86 | /* clear status */ | |
87 | out_be32(&timerp->sr, SLT_SR_BE | SLT_SR_ST); | |
570c0186 TL |
88 | |
89 | /* initialize and enable timer interrupt */ | |
6d0f6bcf | 90 | irq_install_handler(CONFIG_SYS_TMRINTR_NO, dtimer_interrupt, 0); |
570c0186 TL |
91 | |
92 | /* Interrupt every ms */ | |
a4110eec | 93 | out_be32(&timerp->tcnt, 1000 * CONFIG_SYS_TIMER_PRESCALER); |
570c0186 TL |
94 | |
95 | dtimer_intr_setup(); | |
96 | ||
97 | /* set a period of 1us, set timer mode to restart and | |
98 | enable timer and interrupt */ | |
a4110eec | 99 | out_be32(&timerp->cr, SLT_CR_RUN | SLT_CR_IEN | SLT_CR_TEN); |
444ddfc7 | 100 | return 0; |
570c0186 TL |
101 | } |
102 | ||
570c0186 TL |
103 | ulong get_timer(ulong base) |
104 | { | |
105 | return (timestamp - base); | |
106 | } | |
107 | ||
570c0186 | 108 | #endif /* CONFIG_SLTTMR */ |