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, 2007 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>
41 unsigned long decrementer_count; /* count value for 1e6/HZ microseconds */
42 unsigned long timestamp;
45 static __inline__ unsigned long get_msr(void)
49 asm volatile ("mfmsr %0":"=r" (msr):);
54 static __inline__ void set_msr(unsigned long msr)
56 asm volatile ("mtmsr %0"::"r" (msr));
59 static __inline__ unsigned long get_dec(void)
63 asm volatile ("mfdec %0":"=r" (val):);
68 static __inline__ void set_dec(unsigned long val)
71 asm volatile ("mtdec %0"::"r" (val));
74 /* interrupt is not supported yet */
75 int interrupt_init_cpu(unsigned long *decrementer_count)
80 int interrupt_init(void)
84 volatile immap_t *immr = (immap_t *)CFG_IMMR;
85 immr->im_pic.gcr = MPC86xx_PICGCR_RST;
86 while (immr->im_pic.gcr & MPC86xx_PICGCR_RST);
87 immr->im_pic.gcr = MPC86xx_PICGCR_MODE;
89 /* call cpu specific function from $(CPU)/interrupts.c */
90 ret = interrupt_init_cpu(&decrementer_count);
95 decrementer_count = get_tbclk() / CFG_HZ;
96 debug("interrupt init: tbclk() = %d MHz, decrementer_count = %ld\n",
97 (get_tbclk() / 1000000),
100 set_dec(decrementer_count);
102 set_msr(get_msr() | MSR_EE);
104 debug("MSR = 0x%08lx, Decrementer reg = 0x%08lx\n",
108 #ifdef CONFIG_INTERRUPTS
109 volatile ccsr_pic_t *pic = &immr->im_pic;
111 pic->iivpr1 = 0x810001; /* 50220 enable mcm interrupts */
112 debug("iivpr1@%x = %x\n", &pic->iivpr1, pic->iivpr1);
114 pic->iivpr2 = 0x810002; /* 50240 enable ddr interrupts */
115 debug("iivpr2@%x = %x\n", &pic->iivpr2, pic->iivpr2);
117 pic->iivpr3 = 0x810003; /* 50260 enable lbc interrupts */
118 debug("iivpr3@%x = %x\n", &pic->iivpr3, pic->iivpr3);
120 #if defined(CONFIG_PCI1) || defined(CONFIG_PCIE1)
121 pic->iivpr8 = 0x810008; /* enable pcie1 interrupts */
122 debug("iivpr8@%x = %x\n", &pic->iivpr8, pic->iivpr8);
124 #if defined(CONFIG_PCI2) || defined(CONFIG_PCIE2)
125 pic->iivpr9 = 0x810009; /* enable pcie2 interrupts */
126 debug("iivpr9@%x = %x\n", &pic->iivpr9, pic->iivpr9);
129 pic->ctpr = 0; /* 40080 clear current task priority register */
135 void enable_interrupts(void)
137 set_msr(get_msr() | MSR_EE);
140 /* returns flag if MSR_EE was set before */
141 int disable_interrupts(void)
143 ulong msr = get_msr();
145 set_msr(msr & ~MSR_EE);
146 return (msr & MSR_EE) != 0;
149 void increment_timestamp(void)
155 * timer_interrupt - gets called when the decrementer overflows,
156 * with interrupts disabled.
157 * Trivial implementation - no need to be really accurate.
159 void timer_interrupt_cpu(struct pt_regs *regs)
161 /* nothing to do here */
164 void timer_interrupt(struct pt_regs *regs)
166 /* call cpu specific function from $(CPU)/interrupts.c */
167 timer_interrupt_cpu(regs);
171 /* Restore Decrementer Count */
172 set_dec(decrementer_count);
174 #if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
175 if ((timestamp % (CFG_WATCHDOG_FREQ)) == 0)
177 #endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
179 #ifdef CONFIG_STATUS_LED
180 status_led_tick(timestamp);
181 #endif /* CONFIG_STATUS_LED */
183 #ifdef CONFIG_SHOW_ACTIVITY
184 board_show_activity(timestamp);
185 #endif /* CONFIG_SHOW_ACTIVITY */
189 void reset_timer(void)
194 ulong get_timer(ulong base)
196 return timestamp - base;
199 void set_timer(ulong t)
205 * Install and free a interrupt handler. Not implemented yet.
208 void irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
212 void irq_free_handler(int vec)
217 * irqinfo - print information about PCI devices,not implemented.
219 int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
221 printf("\nInterrupt-unsupported:\n");
227 * Handle external interrupts
229 void external_interrupt(struct pt_regs *regs)
231 puts("external_interrupt (oops!)\n");