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wdenk4a9cbbe2002-08-27 09:48:53 +00001/*
2 * (C) Copyright 2000-2002
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 *
23 * Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 22-Oct-00
24 */
25
26#include <common.h>
wdenk4a9cbbe2002-08-27 09:48:53 +000027#include <command.h>
28#include <mpc8260.h>
29#include <mpc8260_irq.h>
30#include <asm/processor.h>
31
Wolfgang Denkd87080b2006-03-31 18:32:53 +020032DECLARE_GLOBAL_DATA_PTR;
33
wdenk4a9cbbe2002-08-27 09:48:53 +000034/****************************************************************************/
35
wdenk4a9cbbe2002-08-27 09:48:53 +000036struct irq_action {
37 interrupt_handler_t *handler;
38 void *arg;
39 ulong count;
40};
41
42static struct irq_action irq_handlers[NR_IRQS];
43
44static ulong ppc_cached_irq_mask[NR_MASK_WORDS];
45
46/****************************************************************************/
47/* this section was ripped out of arch/ppc/kernel/ppc8260_pic.c in the */
48/* Linux/PPC 2.4.x source. There was no copyright notice in that file. */
49
50/* The 8260 internal interrupt controller. It is usually
51 * the only interrupt controller.
52 * There are two 32-bit registers (high/low) for up to 64
53 * possible interrupts.
54 *
55 * Now, the fun starts.....Interrupt Numbers DO NOT MAP
56 * in a simple arithmetic fashion to mask or pending registers.
57 * That is, interrupt 4 does not map to bit position 4.
58 * We create two tables, indexed by vector number, to indicate
59 * which register to use and which bit in the register to use.
60 */
61static u_char irq_to_siureg[] = {
62 1, 1, 1, 1, 1, 1, 1, 1,
63 1, 1, 1, 1, 1, 1, 1, 1,
64 0, 0, 0, 0, 0, 0, 0, 0,
65 0, 0, 0, 0, 0, 0, 0, 0,
66 1, 1, 1, 1, 1, 1, 1, 1,
67 1, 1, 1, 1, 1, 1, 1, 1,
68 0, 0, 0, 0, 0, 0, 0, 0,
69 0, 0, 0, 0, 0, 0, 0, 0
70};
71
72static u_char irq_to_siubit[] = {
73 31, 16, 17, 18, 19, 20, 21, 22,
74 23, 24, 25, 26, 27, 28, 29, 30,
75 29, 30, 16, 17, 18, 19, 20, 21,
76 22, 23, 24, 25, 26, 27, 28, 31,
77 0, 1, 2, 3, 4, 5, 6, 7,
78 8, 9, 10, 11, 12, 13, 14, 15,
79 15, 14, 13, 12, 11, 10, 9, 8,
80 7, 6, 5, 4, 3, 2, 1, 0
81};
82
83static void m8260_mask_irq (unsigned int irq_nr)
84{
85 volatile immap_t *immr = (immap_t *) CFG_IMMR;
86 int bit, word;
87 volatile uint *simr;
88
89 bit = irq_to_siubit[irq_nr];
90 word = irq_to_siureg[irq_nr];
91
92 simr = &(immr->im_intctl.ic_simrh);
93 ppc_cached_irq_mask[word] &= ~(1 << (31 - bit));
94 simr[word] = ppc_cached_irq_mask[word];
95}
96
97static void m8260_unmask_irq (unsigned int irq_nr)
98{
99 volatile immap_t *immr = (immap_t *) CFG_IMMR;
100 int bit, word;
101 volatile uint *simr;
102
103 bit = irq_to_siubit[irq_nr];
104 word = irq_to_siureg[irq_nr];
105
106 simr = &(immr->im_intctl.ic_simrh);
107 ppc_cached_irq_mask[word] |= (1 << (31 - bit));
108 simr[word] = ppc_cached_irq_mask[word];
109}
110
111static void m8260_mask_and_ack (unsigned int irq_nr)
112{
113 volatile immap_t *immr = (immap_t *) CFG_IMMR;
114 int bit, word;
115 volatile uint *simr, *sipnr;
116
117 bit = irq_to_siubit[irq_nr];
118 word = irq_to_siureg[irq_nr];
119
120 simr = &(immr->im_intctl.ic_simrh);
121 sipnr = &(immr->im_intctl.ic_sipnrh);
122 ppc_cached_irq_mask[word] &= ~(1 << (31 - bit));
123 simr[word] = ppc_cached_irq_mask[word];
124 sipnr[word] = 1 << (31 - bit);
125}
126
127static int m8260_get_irq (struct pt_regs *regs)
128{
129 volatile immap_t *immr = (immap_t *) CFG_IMMR;
130 int irq;
131 unsigned long bits;
132
133 /* For MPC8260, read the SIVEC register and shift the bits down
134 * to get the irq number. */
135 bits = immr->im_intctl.ic_sivec;
136 irq = bits >> 26;
137 return irq;
138}
139
140/* end of code ripped out of arch/ppc/kernel/ppc8260_pic.c */
141/****************************************************************************/
142
wdenka8c7c702003-12-06 19:49:23 +0000143int interrupt_init_cpu (unsigned *decrementer_count)
wdenk4a9cbbe2002-08-27 09:48:53 +0000144{
wdenk4a9cbbe2002-08-27 09:48:53 +0000145 volatile immap_t *immr = (immap_t *) CFG_IMMR;
146
wdenka8c7c702003-12-06 19:49:23 +0000147 *decrementer_count = (gd->bus_clk / 4) / CFG_HZ;
wdenk4a9cbbe2002-08-27 09:48:53 +0000148
149 /* Initialize the default interrupt mapping priorities */
150 immr->im_intctl.ic_sicr = 0;
151 immr->im_intctl.ic_siprr = 0x05309770;
152 immr->im_intctl.ic_scprrh = 0x05309770;
153 immr->im_intctl.ic_scprrl = 0x05309770;
154
155 /* disable all interrupts and clear all pending bits */
156 immr->im_intctl.ic_simrh = ppc_cached_irq_mask[0] = 0;
157 immr->im_intctl.ic_simrl = ppc_cached_irq_mask[1] = 0;
158 immr->im_intctl.ic_sipnrh = 0xffffffff;
159 immr->im_intctl.ic_sipnrl = 0xffffffff;
160
wdenk6dd652f2003-06-19 23:40:20 +0000161#ifdef CONFIG_HYMOD
162 /*
163 * ensure all external interrupt sources default to trigger on
164 * high-to-low transition (i.e. edge triggered active low)
165 */
166 immr->im_intctl.ic_siexr = -1;
167#endif
168
wdenk4a9cbbe2002-08-27 09:48:53 +0000169 return (0);
170}
171
172/****************************************************************************/
173
174/*
175 * Handle external interrupts
176 */
177void external_interrupt (struct pt_regs *regs)
178{
179 int irq, unmask = 1;
180
181 irq = m8260_get_irq (regs);
182
183 m8260_mask_and_ack (irq);
184
wdenka8c7c702003-12-06 19:49:23 +0000185 enable_interrupts ();
wdenk4a9cbbe2002-08-27 09:48:53 +0000186
187 if (irq_handlers[irq].handler != NULL)
188 (*irq_handlers[irq].handler) (irq_handlers[irq].arg);
189 else {
190 printf ("\nBogus External Interrupt IRQ %d\n", irq);
191 /*
192 * turn off the bogus interrupt, otherwise it
193 * might repeat forever
194 */
195 unmask = 0;
196 }
197
198 if (unmask)
199 m8260_unmask_irq (irq);
200}
201
202/****************************************************************************/
203
204/*
205 * Install and free an interrupt handler.
206 */
207
208void
209irq_install_handler (int irq, interrupt_handler_t * handler, void *arg)
210{
211 if (irq < 0 || irq >= NR_IRQS) {
212 printf ("irq_install_handler: bad irq number %d\n", irq);
213 return;
214 }
215
216 if (irq_handlers[irq].handler != NULL)
217 printf ("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
218 (ulong) handler, (ulong) irq_handlers[irq].handler);
219
220 irq_handlers[irq].handler = handler;
221 irq_handlers[irq].arg = arg;
222
223 m8260_unmask_irq (irq);
224}
225
226void irq_free_handler (int irq)
227{
228 if (irq < 0 || irq >= NR_IRQS) {
229 printf ("irq_free_handler: bad irq number %d\n", irq);
230 return;
231 }
232
233 m8260_mask_irq (irq);
234
235 irq_handlers[irq].handler = NULL;
236 irq_handlers[irq].arg = NULL;
237}
238
239/****************************************************************************/
240
wdenka8c7c702003-12-06 19:49:23 +0000241void timer_interrupt_cpu (struct pt_regs *regs)
wdenk4a9cbbe2002-08-27 09:48:53 +0000242{
wdenka8c7c702003-12-06 19:49:23 +0000243 /* nothing to do here */
244 return;
wdenk4a9cbbe2002-08-27 09:48:53 +0000245}
246
247/****************************************************************************/
248
Jon Loeliger44312832007-07-09 19:06:00 -0500249#if defined(CONFIG_CMD_IRQ)
wdenk4a9cbbe2002-08-27 09:48:53 +0000250
251/* ripped this out of ppc4xx/interrupts.c */
252
253/*******************************************************************************
254*
255* irqinfo - print information about PCI devices
256*
257*/
258void
259do_irqinfo (cmd_tbl_t * cmdtp, bd_t * bd, int flag, int argc, char *argv[])
260{
261 int irq, re_enable;
262
263 re_enable = disable_interrupts ();
264
wdenk4b9206e2004-03-23 22:14:11 +0000265 puts ("\nInterrupt-Information:\n"
266 "Nr Routine Arg Count\n");
wdenk4a9cbbe2002-08-27 09:48:53 +0000267
268 for (irq = 0; irq < 32; irq++)
269 if (irq_handlers[irq].handler != NULL)
270 printf ("%02d %08lx %08lx %ld\n", irq,
271 (ulong) irq_handlers[irq].handler,
272 (ulong) irq_handlers[irq].arg,
273 irq_handlers[irq].count);
274
275 if (re_enable)
276 enable_interrupts ();
277}
278
Jon Loeliger44312832007-07-09 19:06:00 -0500279#endif