2 * (C) Copyright 2000-2002
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * (C) Copyright 2002 (440 port)
6 * Scott McNutt, Artesyn Communication Producs, smcnutt@artsyncp.com
8 * (C) Copyright 2003 Motorola Inc. (MPC85xx port)
9 * Xianghua Xiao (X.Xiao@motorola.com)
11 * See file CREDITS for list of people who contributed to this
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.
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.
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,
33 #include <asm/processor.h>
34 #include <ppc_asm.tmpl>
36 unsigned decrementer_count; /* count value for 1e6/HZ microseconds */
38 static __inline__ unsigned long get_msr(void)
42 asm volatile("mfmsr %0" : "=r" (msr) :);
46 static __inline__ void set_msr(unsigned long msr)
48 asm volatile("mtmsr %0" : : "r" (msr));
49 asm volatile("isync");
52 void enable_interrupts (void)
54 set_msr (get_msr() | MSR_EE);
57 /* returns flag if MSR_EE was set before */
58 int disable_interrupts (void)
60 ulong msr = get_msr();
61 set_msr (msr & ~MSR_EE);
62 return ((msr & MSR_EE) != 0);
65 /* interrupt is not supported yet */
66 int interrupt_init (void)
72 * Install and free a interrupt handler. Not implemented yet.
76 irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
82 irq_free_handler(int vec)
87 /****************************************************************************/
90 volatile ulong timestamp = 0;
93 * timer_interrupt - gets called when the decrementer overflows,
94 * with interrupts disabled.
95 * Trivial implementation - no need to be really accurate.
97 void timer_interrupt(struct pt_regs *regs)
99 printf ("*** Timer Interrupt *** ");
102 #if defined(CONFIG_WATCHDOG)
103 if ((timestamp % 1000) == 0)
104 reset_85xx_watchdog();
105 #endif /* CONFIG_WATCHDOG */
108 void reset_timer (void)
113 ulong get_timer (ulong base)
115 return (timestamp - base);
118 void set_timer (ulong t)
123 #if (CONFIG_COMMANDS & CFG_CMD_IRQ)
125 /*******************************************************************************
127 * irqinfo - print information about PCI devices,not implemented.
131 do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
133 printf ("\nInterrupt-unsupported:\n");
138 #endif /* CONFIG_COMMANDS & CFG_CMD_IRQ */