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42d1f039 WD |
1 | /* |
2 | * (C) Copyright 2000-2002 | |
3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
4 | * | |
5 | * (C) Copyright 2002 (440 port) | |
6 | * Scott McNutt, Artesyn Communication Producs, smcnutt@artsyncp.com | |
7 | * | |
8 | * (C) Copyright 2003 Motorola Inc. (MPC85xx port) | |
9 | * Xianghua Xiao (X.Xiao@motorola.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 <watchdog.h> | |
32 | #include <command.h> | |
33 | #include <asm/processor.h> | |
34 | #include <ppc_asm.tmpl> | |
35 | ||
36 | unsigned decrementer_count; /* count value for 1e6/HZ microseconds */ | |
37 | ||
38 | static __inline__ unsigned long get_msr(void) | |
39 | { | |
40 | unsigned long msr; | |
41 | ||
42 | asm volatile("mfmsr %0" : "=r" (msr) :); | |
43 | return msr; | |
44 | } | |
45 | ||
46 | static __inline__ void set_msr(unsigned long msr) | |
47 | { | |
48 | asm volatile("mtmsr %0" : : "r" (msr)); | |
49 | asm volatile("isync"); | |
50 | } | |
51 | ||
52 | void enable_interrupts (void) | |
53 | { | |
54 | set_msr (get_msr() | MSR_EE); | |
55 | } | |
56 | ||
57 | /* returns flag if MSR_EE was set before */ | |
58 | int disable_interrupts (void) | |
59 | { | |
60 | ulong msr = get_msr(); | |
61 | set_msr (msr & ~MSR_EE); | |
62 | return ((msr & MSR_EE) != 0); | |
63 | } | |
64 | ||
65 | /* interrupt is not supported yet */ | |
66 | int interrupt_init (void) | |
67 | { | |
68 | return (0); | |
69 | } | |
70 | ||
71 | /* | |
72 | * Install and free a interrupt handler. Not implemented yet. | |
73 | */ | |
74 | ||
75 | void | |
76 | irq_install_handler(int vec, interrupt_handler_t *handler, void *arg) | |
77 | { | |
78 | return; | |
79 | } | |
80 | ||
81 | void | |
82 | irq_free_handler(int vec) | |
83 | { | |
84 | return; | |
85 | } | |
86 | ||
87 | /****************************************************************************/ | |
88 | ||
89 | ||
90 | volatile ulong timestamp = 0; | |
91 | ||
92 | /* | |
93 | * timer_interrupt - gets called when the decrementer overflows, | |
94 | * with interrupts disabled. | |
95 | * Trivial implementation - no need to be really accurate. | |
96 | */ | |
97 | void timer_interrupt(struct pt_regs *regs) | |
98 | { | |
99 | printf ("*** Timer Interrupt *** "); | |
100 | timestamp++; | |
101 | ||
102 | #if defined(CONFIG_WATCHDOG) | |
103 | if ((timestamp % 1000) == 0) | |
104 | reset_85xx_watchdog(); | |
105 | #endif /* CONFIG_WATCHDOG */ | |
106 | } | |
107 | ||
108 | void reset_timer (void) | |
109 | { | |
110 | timestamp = 0; | |
111 | } | |
112 | ||
113 | ulong get_timer (ulong base) | |
114 | { | |
115 | return (timestamp - base); | |
116 | } | |
117 | ||
118 | void set_timer (ulong t) | |
119 | { | |
120 | timestamp = t; | |
121 | } | |
122 | ||
123 | #if (CONFIG_COMMANDS & CFG_CMD_IRQ) | |
124 | ||
125 | /******************************************************************************* | |
126 | * | |
127 | * irqinfo - print information about PCI devices,not implemented. | |
128 | * | |
129 | */ | |
130 | int | |
131 | do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) | |
132 | { | |
133 | printf ("\nInterrupt-unsupported:\n"); | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | #endif /* CONFIG_COMMANDS & CFG_CMD_IRQ */ |