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 * (C) Copyright 2004 Freescale Semiconductor. (MPC86xx Port)
13 * Srikanth Srinivasan (srikanth.srinivasan@freescale.com)
15 * See file CREDITS for list of people who contributed to this
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License as
20 * published by the Free Software Foundation; either version 2 of
21 * the License, or (at your option) any later version.
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
37 #include <asm/processor.h>
38 #include <ppc_asm.tmpl>
40 unsigned long decrementer_count; /* count value for 1e6/HZ microseconds */
41 unsigned long timestamp;
44 static __inline__ unsigned long get_msr(void)
48 asm volatile ("mfmsr %0":"=r" (msr):);
53 static __inline__ void set_msr(unsigned long msr)
55 asm volatile ("mtmsr %0"::"r" (msr));
58 static __inline__ unsigned long get_dec(void)
62 asm volatile ("mfdec %0":"=r" (val):);
67 static __inline__ void set_dec(unsigned long val)
70 asm volatile ("mtdec %0"::"r" (val));
73 /* interrupt is not supported yet */
74 int interrupt_init_cpu(unsigned *decrementer_count)
79 int interrupt_init(void)
83 /* call cpu specific function from $(CPU)/interrupts.c */
84 ret = interrupt_init_cpu(&decrementer_count);
89 decrementer_count = get_tbclk() / CFG_HZ;
90 debug("interrupt init: tbclk() = %d MHz, decrementer_count = %d\n",
91 (get_tbclk() / 1000000),
94 set_dec(decrementer_count);
96 set_msr(get_msr() | MSR_EE);
98 debug("MSR = 0x%08lx, Decrementer reg = 0x%08lx\n",
105 void enable_interrupts(void)
107 set_msr(get_msr() | MSR_EE);
110 /* returns flag if MSR_EE was set before */
111 int disable_interrupts(void)
113 ulong msr = get_msr();
115 set_msr(msr & ~MSR_EE);
116 return (msr & MSR_EE) != 0;
119 void increment_timestamp(void)
125 * timer_interrupt - gets called when the decrementer overflows,
126 * with interrupts disabled.
127 * Trivial implementation - no need to be really accurate.
129 void timer_interrupt_cpu(struct pt_regs *regs)
131 /* nothing to do here */
134 void timer_interrupt(struct pt_regs *regs)
136 /* call cpu specific function from $(CPU)/interrupts.c */
137 timer_interrupt_cpu(regs);
143 /* Restore Decrementer Count */
144 set_dec(decrementer_count);
146 #if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
147 if ((timestamp % (CFG_WATCHDOG_FREQ)) == 0)
149 #endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
151 #ifdef CONFIG_STATUS_LED
152 status_led_tick(timestamp);
153 #endif /* CONFIG_STATUS_LED */
155 #ifdef CONFIG_SHOW_ACTIVITY
156 board_show_activity(timestamp);
157 #endif /* CONFIG_SHOW_ACTIVITY */
161 void reset_timer(void)
166 ulong get_timer(ulong base)
168 return timestamp - base;
171 void set_timer(ulong t)
177 * Install and free a interrupt handler. Not implemented yet.
180 void irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
184 void irq_free_handler(int vec)
189 * irqinfo - print information about PCI devices,not implemented.
191 int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
193 printf("\nInterrupt-unsupported:\n");
199 * Handle external interrupts
201 void external_interrupt(struct pt_regs *regs)
203 puts("external_interrupt (oops!)\n");