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 * See file CREDITS for list of people who contributed to this
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of
14 * the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
30 #include <asm/processor.h>
32 #include <ppc_asm.tmpl>
36 /****************************************************************************/
38 unsigned decrementer_count; /* count value for 1e6/HZ microseconds */
40 /****************************************************************************/
43 * CPM interrupt vector functions.
46 interrupt_handler_t *handler;
51 static struct irq_action irq_vecs[32];
53 #if defined(CONFIG_440)
54 static struct irq_action irq_vecs1[32]; /* For UIC1 */
56 void uic1_interrupt( void * parms); /* UIC1 handler */
59 /****************************************************************************/
61 static __inline__ unsigned long get_msr(void)
65 asm volatile("mfmsr %0" : "=r" (msr) :);
69 static __inline__ void set_msr(unsigned long msr)
71 asm volatile("mtmsr %0" : : "r" (msr));
74 #if defined(CONFIG_440)
76 /* SPRN changed in 440 */
77 static __inline__ void set_evpr(unsigned long val)
79 asm volatile("mtspr 0x03f,%0" : : "r" (val));
82 #else /* !defined(CONFIG_440) */
84 static __inline__ unsigned long get_dec(void)
88 asm volatile("mfdec %0" : "=r" (val) :);
93 static __inline__ void set_dec(unsigned long val)
95 asm volatile("mtdec %0" : : "r" (val));
99 static __inline__ void set_pit(unsigned long val)
101 asm volatile("mtpit %0" : : "r" (val));
105 static __inline__ void set_tcr(unsigned long val)
107 asm volatile("mttcr %0" : : "r" (val));
111 static __inline__ void set_evpr(unsigned long val)
113 asm volatile("mtevpr %0" : : "r" (val));
115 #endif /* defined(CONFIG_440 */
118 void enable_interrupts (void)
120 set_msr (get_msr() | MSR_EE);
123 /* returns flag if MSR_EE was set before */
124 int disable_interrupts (void)
126 ulong msr = get_msr();
127 set_msr (msr & ~MSR_EE);
128 return ((msr & MSR_EE) != 0);
131 /****************************************************************************/
133 int interrupt_init(void)
135 DECLARE_GLOBAL_DATA_PTR;
141 * Mark all irqs as free
143 for (vec=0; vec<32; vec++) {
144 irq_vecs[vec].handler = NULL;
145 irq_vecs[vec].arg = NULL;
146 irq_vecs[vec].count = 0;
147 #if defined(CONFIG_440)
148 irq_vecs1[vec].handler = NULL;
149 irq_vecs1[vec].arg = NULL;
150 irq_vecs1[vec].count = 0;
158 #if defined(CONFIG_440)
160 val &= (~0x04400000); /* clear DIS & ARE */
162 mtspr( dec, 0 ); /* Prevent exception after TSR clear*/
163 mtspr( decar, 0 ); /* clear reload */
164 mtspr( tsr, 0x08000000 ); /* clear DEC status */
165 val = gd->bd->bi_intfreq/100; /* 10 msec */
166 mtspr( decar, val ); /* Set auto-reload value */
167 mtspr( dec, val ); /* Set inital val */
169 set_pit(gd->bd->bi_intfreq / 1000);
171 #endif /* CONFIG_4xx */
190 set_evpr(0x00000000);
192 #if defined(CONFIG_440)
193 /* Install the UIC1 handlers */
194 irq_install_handler(VECNUM_UIC1NC, uic1_interrupt, 0);
195 irq_install_handler(VECNUM_UIC1C, uic1_interrupt, 0);
198 * Enable external interrupts (including PIT)
200 set_msr (get_msr() | MSR_EE);
205 /****************************************************************************/
208 * Handle external interrupts
210 void external_interrupt(struct pt_regs *regs)
217 * Read masked interrupt status register to determine interrupt source
219 uic_msr = mfdcr(uicmsr);
223 while (msr_shift != 0) {
224 if (msr_shift & 0x80000000) {
226 * Increment irq counter (for debug purpose only)
228 irq_vecs[vec].count++;
230 if (irq_vecs[vec].handler != NULL) {
232 (*irq_vecs[vec].handler)(irq_vecs[vec].arg);
234 mtdcr(uicer, mfdcr(uicer) & ~(0x80000000 >> vec));
235 printf ("Masking bogus interrupt vector 0x%x\n", vec);
239 * After servicing the interrupt, we have to remove the status indicator.
241 mtdcr(uicsr, (0x80000000 >> vec));
245 * Shift msr to next position and increment vector
252 #if defined(CONFIG_440)
253 /* Handler for UIC1 interrupt */
254 void uic1_interrupt( void * parms)
261 * Read masked interrupt status register to determine interrupt source
263 uic1_msr = mfdcr(uic1msr);
264 msr_shift = uic1_msr;
267 while (msr_shift != 0) {
268 if (msr_shift & 0x80000000) {
270 * Increment irq counter (for debug purpose only)
272 irq_vecs1[vec].count++;
274 if (irq_vecs1[vec].handler != NULL) {
276 (*irq_vecs1[vec].handler)(irq_vecs1[vec].arg);
278 mtdcr(uic1er, mfdcr(uic1er) & ~(0x80000000 >> vec));
279 printf ("Masking bogus interrupt vector (uic1) 0x%x\n", vec);
283 * After servicing the interrupt, we have to remove the status indicator.
285 mtdcr(uic1sr, (0x80000000 >> vec));
289 * Shift msr to next position and increment vector
295 #endif /* defined(CONFIG_440) */
297 /****************************************************************************/
300 * Install and free a interrupt handler.
304 irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
306 struct irq_action *irqa = irq_vecs;
309 #if defined(CONFIG_440)
316 if (irqa[i].handler != NULL) {
317 printf ("Interrupt vector %d: handler 0x%x replacing 0x%x\n",
318 vec, (uint)handler, (uint)irqa[i].handler);
320 irqa[i].handler = handler;
323 #if defined(CONFIG_440)
325 mtdcr(uic1er, mfdcr(uic1er) | (0x80000000 >> i));
328 mtdcr(uicer, mfdcr(uicer) | (0x80000000 >> i));
330 printf ("Install interrupt for vector %d ==> %p\n", vec, handler);
335 irq_free_handler(int vec)
337 struct irq_action *irqa = irq_vecs;
340 #if defined(CONFIG_440)
348 printf ("Free interrupt for vector %d ==> %p\n",
349 vec, irq_vecs[vec].handler);
352 #if defined(CONFIG_440)
354 mtdcr(uic1er, mfdcr(uic1er) & ~(0x80000000 >> i));
357 mtdcr(uicer, mfdcr(uicer) & ~(0x80000000 >> i));
359 irqa[i].handler = NULL;
363 /****************************************************************************/
366 volatile ulong timestamp = 0;
369 * timer_interrupt - gets called when the decrementer overflows,
370 * with interrupts disabled.
371 * Trivial implementation - no need to be really accurate.
373 void timer_interrupt(struct pt_regs *regs)
376 printf ("*** Timer Interrupt *** ");
380 #if defined(CONFIG_WATCHDOG)
381 if ((timestamp % 1000) == 0)
382 reset_4xx_watchdog();
383 #endif /* CONFIG_WATCHDOG */
386 /****************************************************************************/
388 void reset_timer (void)
393 ulong get_timer (ulong base)
395 return (timestamp - base);
398 void set_timer (ulong t)
403 /****************************************************************************/
406 #if (CONFIG_COMMANDS & CFG_CMD_IRQ)
408 /*******************************************************************************
410 * irqinfo - print information about PCI devices
414 do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
418 printf ("\nInterrupt-Information:\n");
419 #if defined(CONFIG_440)
420 printf ("\nUIC 0\n");
422 printf ("Nr Routine Arg Count\n");
424 for (vec=0; vec<32; vec++) {
425 if (irq_vecs[vec].handler != NULL) {
426 printf ("%02d %08lx %08lx %d\n",
428 (ulong)irq_vecs[vec].handler,
429 (ulong)irq_vecs[vec].arg,
430 irq_vecs[vec].count);
434 #if defined(CONFIG_440)
435 printf ("\nUIC 1\n");
436 printf ("Nr Routine Arg Count\n");
438 for (vec=0; vec<32; vec++)
440 if (irq_vecs1[vec].handler != NULL)
441 printf ("%02d %08lx %08lx %d\n",
442 vec+31, (ulong)irq_vecs1[vec].handler,
443 (ulong)irq_vecs1[vec].arg, irq_vecs1[vec].count);
451 #endif /* CONFIG_COMMANDS & CFG_CMD_IRQ */