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1 | /* |
2 | * (C) Copyright 2000-2002 | |
3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
4 | * | |
5 | * (C) Copyright 2003 | |
6 | * Gleb Natapov <gnatapov@mrv.com> | |
7 | * | |
8 | * (C) Copyright 2007 | |
9 | * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com. | |
10 | * | |
11 | * See file CREDITS for list of people who contributed to this | |
12 | * project. | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License as | |
16 | * published by the Free Software Foundation; either version 2 of | |
17 | * the License, or (at your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with this program; if not, write to the Free Software | |
26 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
27 | * MA 02111-1307 USA | |
28 | */ | |
29 | ||
30 | #include <common.h> | |
31 | #include <asm/processor.h> | |
32 | #include <asm/irq.h> | |
33 | ||
34 | /* Implemented by SPARC CPUs */ | |
35 | extern int interrupt_init_cpu(void); | |
36 | extern void timer_interrupt_cpu(void *arg); | |
37 | extern int timer_interrupt_init_cpu(void); | |
38 | ||
39 | int intLock(void) | |
40 | { | |
41 | unsigned int pil; | |
42 | ||
43 | pil = get_pil(); | |
44 | ||
45 | /* set PIL to 15 ==> no pending interrupts will interrupt CPU */ | |
46 | set_pil(15); | |
47 | ||
48 | return pil; | |
49 | } | |
50 | ||
51 | void intUnlock(int oldLevel) | |
52 | { | |
53 | set_pil(oldLevel); | |
54 | } | |
55 | ||
56 | void enable_interrupts(void) | |
57 | { | |
58 | set_pil(0); /* enable all interrupts */ | |
59 | } | |
60 | ||
61 | int disable_interrupts(void) | |
62 | { | |
63 | return intLock(); | |
64 | } | |
65 | ||
66 | int interrupt_init(void) | |
67 | { | |
68 | int ret; | |
69 | ||
70 | /* call cpu specific function from $(CPU)/interrupts.c */ | |
71 | ret = interrupt_init_cpu(); | |
72 | ||
73 | /* enable global interrupts */ | |
74 | enable_interrupts(); | |
75 | ||
76 | return ret; | |
77 | } | |
78 | ||
79 | /* timer interrupt/overflow counter */ | |
80 | static volatile ulong timestamp = 0; | |
81 | ||
82 | /* regs can not be used here! regs is actually the pointer given in | |
83 | * irq_install_handler | |
84 | */ | |
85 | void timer_interrupt(struct pt_regs *regs) | |
86 | { | |
87 | /* call cpu specific function from $(CPU)/interrupts.c */ | |
88 | timer_interrupt_cpu((void *)regs); | |
89 | ||
90 | timestamp++; | |
91 | } | |
92 | ||
93 | void reset_timer(void) | |
94 | { | |
95 | timestamp = 0; | |
96 | } | |
97 | ||
98 | ulong get_timer(ulong base) | |
99 | { | |
100 | return (timestamp - base); | |
101 | } | |
102 | ||
103 | void set_timer(ulong t) | |
104 | { | |
105 | timestamp = t; | |
106 | } | |
107 | ||
108 | void timer_interrupt_init(void) | |
109 | { | |
110 | int irq; | |
111 | ||
112 | reset_timer(); | |
113 | ||
114 | irq = timer_interrupt_init_cpu(); | |
115 | ||
116 | if (irq < 0) { | |
117 | /* cpu specific code handled the interrupt registration it self */ | |
118 | return; | |
119 | } | |
120 | /* register interrupt handler for timer */ | |
121 | irq_install_handler(irq, (void (*)(void *))timer_interrupt, NULL); | |
122 | } |