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  * (C) Copyright 2004, 2007 Freescale Semiconductor. (MPC86xx Port)
12  * Jeff Brown
13  * Srikanth Srinivasan (srikanth.srinivasan@freescale.com)
14  *
15  * See file CREDITS for list of people who contributed to this
16  * project.
17  *
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.
22  *
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.
27  *
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,
31  * MA 02111-1307 USA
32  */
33 
34 #include <common.h>
35 #include <mpc86xx.h>
36 #include <command.h>
37 #include <asm/processor.h>
38 #ifdef CONFIG_POST
39 #include <post.h>
40 #endif
41 
42 int interrupt_init_cpu(unsigned long *decrementer_count)
43 {
44 	volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
45 	volatile ccsr_pic_t *pic = &immr->im_pic;
46 
47 #ifdef CONFIG_POST
48 	/*
49 	 * The POST word is stored in the PIC's TFRR register which gets
50 	 * cleared when the PIC is reset.  Save it off so we can restore it
51 	 * later.
52 	 */
53 	ulong post_word = post_word_load();
54 #endif
55 
56 	pic->gcr = MPC86xx_PICGCR_RST;
57 	while (pic->gcr & MPC86xx_PICGCR_RST)
58 		;
59 	pic->gcr = MPC86xx_PICGCR_MODE;
60 
61 	*decrementer_count = get_tbclk() / CONFIG_SYS_HZ;
62 	debug("interrupt init: tbclk() = %d MHz, decrementer_count = %ld\n",
63 	      (get_tbclk() / 1000000),
64 	      *decrementer_count);
65 
66 #ifdef CONFIG_INTERRUPTS
67 
68 	pic->iivpr1 = 0x810001;	/* 50220 enable mcm interrupts */
69 	debug("iivpr1@%x = %x\n", &pic->iivpr1, pic->iivpr1);
70 
71 	pic->iivpr2 = 0x810002;	/* 50240 enable ddr interrupts */
72 	debug("iivpr2@%x = %x\n", &pic->iivpr2, pic->iivpr2);
73 
74 	pic->iivpr3 = 0x810003;	/* 50260 enable lbc interrupts */
75 	debug("iivpr3@%x = %x\n", &pic->iivpr3, pic->iivpr3);
76 
77 #if defined(CONFIG_PCI1) || defined(CONFIG_PCIE1)
78 	pic->iivpr8 = 0x810008;	/* enable pcie1 interrupts */
79 	debug("iivpr8@%x = %x\n", &pic->iivpr8, pic->iivpr8);
80 #endif
81 #if defined(CONFIG_PCI2) || defined(CONFIG_PCIE2)
82 	pic->iivpr9 = 0x810009;	/* enable pcie2 interrupts */
83 	debug("iivpr9@%x = %x\n", &pic->iivpr9, pic->iivpr9);
84 #endif
85 
86 	pic->ctpr = 0;	/* 40080 clear current task priority register */
87 #endif
88 
89 #ifdef CONFIG_POST
90 	post_word_store(post_word);
91 #endif
92 
93 	return 0;
94 }
95 
96 /*
97  * timer_interrupt - gets called when the decrementer overflows,
98  * with interrupts disabled.
99  * Trivial implementation - no need to be really accurate.
100  */
101 void timer_interrupt_cpu(struct pt_regs *regs)
102 {
103 	/* nothing to do here */
104 }
105 
106 /*
107  * Install and free a interrupt handler. Not implemented yet.
108  */
109 void irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
110 {
111 }
112 
113 void irq_free_handler(int vec)
114 {
115 }
116 
117 /*
118  * irqinfo - print information about PCI devices,not implemented.
119  */
120 int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
121 {
122 	return 0;
123 }
124 
125 /*
126  * Handle external interrupts
127  */
128 void external_interrupt(struct pt_regs *regs)
129 {
130 	puts("external_interrupt (oops!)\n");
131 }
132