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wdenk42d1f032003-10-15 23:53:47 +00001/*
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
36unsigned decrementer_count; /* count value for 1e6/HZ microseconds */
37
38static __inline__ unsigned long get_msr(void)
39{
40 unsigned long msr;
41
42 asm volatile("mfmsr %0" : "=r" (msr) :);
43 return msr;
44}
45
46static __inline__ void set_msr(unsigned long msr)
47{
48 asm volatile("mtmsr %0" : : "r" (msr));
49 asm volatile("isync");
50}
51
wdenk343117b2005-05-13 22:49:36 +000052static __inline__ unsigned long get_dec (void)
53{
54 unsigned long val;
55
56 asm volatile ("mfdec %0":"=r" (val):);
57
58 return val;
59}
60
61
62static __inline__ void set_dec (unsigned long val)
63{
64 if (val)
65 asm volatile ("mtdec %0"::"r" (val));
66}
67
wdenk42d1f032003-10-15 23:53:47 +000068void enable_interrupts (void)
69{
70 set_msr (get_msr() | MSR_EE);
71}
72
73/* returns flag if MSR_EE was set before */
74int disable_interrupts (void)
75{
76 ulong msr = get_msr();
77 set_msr (msr & ~MSR_EE);
78 return ((msr & MSR_EE) != 0);
79}
80
wdenk42d1f032003-10-15 23:53:47 +000081int interrupt_init (void)
82{
wdenk343117b2005-05-13 22:49:36 +000083 volatile immap_t *immr = (immap_t *)CFG_IMMR;
84
85 immr->im_pic.gcr = MPC85xx_PICGCR_RST;
86 while (immr->im_pic.gcr & MPC85xx_PICGCR_RST);
87 immr->im_pic.gcr = MPC85xx_PICGCR_M;
88 decrementer_count = get_tbclk() / CFG_HZ;
89 mtspr(SPRN_TCR, TCR_PIE);
90 set_dec (decrementer_count);
91 set_msr (get_msr () | MSR_EE);
wdenk42d1f032003-10-15 23:53:47 +000092 return (0);
93}
94
95/*
96 * Install and free a interrupt handler. Not implemented yet.
97 */
98
99void
100irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
101{
102 return;
103}
104
105void
106irq_free_handler(int vec)
107{
108 return;
109}
110
111/****************************************************************************/
112
113
114volatile ulong timestamp = 0;
115
116/*
117 * timer_interrupt - gets called when the decrementer overflows,
118 * with interrupts disabled.
119 * Trivial implementation - no need to be really accurate.
120 */
121void timer_interrupt(struct pt_regs *regs)
122{
wdenk42d1f032003-10-15 23:53:47 +0000123 timestamp++;
wdenk343117b2005-05-13 22:49:36 +0000124 set_dec (decrementer_count);
125 mtspr(SPRN_TSR, TSR_PIS);
wdenk42d1f032003-10-15 23:53:47 +0000126#if defined(CONFIG_WATCHDOG)
127 if ((timestamp % 1000) == 0)
128 reset_85xx_watchdog();
129#endif /* CONFIG_WATCHDOG */
130}
131
132void reset_timer (void)
133{
134 timestamp = 0;
135}
136
137ulong get_timer (ulong base)
138{
139 return (timestamp - base);
140}
141
142void set_timer (ulong t)
143{
144 timestamp = t;
145}
146
Jon Loeliger44312832007-07-09 19:06:00 -0500147#if defined(CONFIG_CMD_IRQ)
wdenk42d1f032003-10-15 23:53:47 +0000148
149/*******************************************************************************
150 *
151 * irqinfo - print information about PCI devices,not implemented.
152 *
153 */
154int
155do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
156{
157 printf ("\nInterrupt-unsupported:\n");
158
159 return 0;
160}
161
Jon Loeliger44312832007-07-09 19:06:00 -0500162#endif