aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/sun4m_irq.c
blob: 39d712c3c80981f3f8851908b09950ca8783d212 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
/*  sun4m_irq.c
 *  arch/sparc/kernel/sun4m_irq.c:
 *
 *  djhr: Hacked out of irq.c into a CPU dependent version.
 *
 *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 *  Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
 *  Copyright (C) 1995 Pete A. Zaitcev (zaitcev@yahoo.com)
 *  Copyright (C) 1996 Dave Redman (djhr@tadpole.co.uk)
 */

#include <linux/config.h>
#include <linux/errno.h>
#include <linux/linkage.h>
#include <linux/kernel_stat.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/ioport.h>

#include <asm/ptrace.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/psr.h>
#include <asm/vaddrs.h>
#include <asm/timer.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/traps.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/smp.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/sbus.h>
#include <asm/cacheflush.h>

static unsigned long dummy;

struct sun4m_intregs *sun4m_interrupts;
unsigned long *irq_rcvreg = &dummy;

/* These tables only apply for interrupts greater than 15..
 * 
 * any intr value below 0x10 is considered to be a soft-int
 * this may be useful or it may not.. but that's how I've done it.
 * and it won't clash with what OBP is telling us about devices.
 *
 * take an encoded intr value and lookup if it's valid
 * then get the mask bits that match from irq_mask
 *
 * P3: Translation from irq 0x0d to mask 0x2000 is for MrCoffee.
 */
static unsigned char irq_xlate[32] = {
    /*  0,  1,  2,  3,  4,  5,  6,  7,  8,  9,  a,  b,  c,  d,  e,  f */
	0,  0,  0,  0,  1,  0,  2,  0,  3,  0,  4,  5,  6, 14,  0,  7,
	0,  0,  8,  9,  0, 10,  0, 11,  0, 12,  0, 13,  0, 14,  0,  0
};

static unsigned long irq_mask[] = {
	0,						  /* illegal index */
	SUN4M_INT_SCSI,				  	  /*  1 irq 4 */
	SUN4M_INT_ETHERNET,				  /*  2 irq 6 */
	SUN4M_INT_VIDEO,				  /*  3 irq 8 */
	SUN4M_INT_REALTIME,				  /*  4 irq 10 */
	SUN4M_INT_FLOPPY,				  /*  5 irq 11 */
	(SUN4M_INT_SERIAL | SUN4M_INT_KBDMS),	  	  /*  6 irq 12 */
	SUN4M_INT_MODULE_ERR,			  	  /*  7 irq 15 */
	SUN4M_INT_SBUS(0),				  /*  8 irq 2 */
	SUN4M_INT_SBUS(1),				  /*  9 irq 3 */
	SUN4M_INT_SBUS(2),				  /* 10 irq 5 */
	SUN4M_INT_SBUS(3),				  /* 11 irq 7 */
	SUN4M_INT_SBUS(4),				  /* 12 irq 9 */
	SUN4M_INT_SBUS(5),				  /* 13 irq 11 */
	SUN4M_INT_SBUS(6)				  /* 14 irq 13 */
};

static int sun4m_pil_map[] = { 0, 2, 3, 5, 7, 9, 11, 13 };

unsigned int sun4m_sbint_to_irq(struct sbus_dev *sdev, unsigned int sbint) 
{
	if (sbint >= sizeof(sun4m_pil_map)) {
		printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
		BUG();
	}
	return sun4m_pil_map[sbint] | 0x30;
}

inline unsigned long sun4m_get_irqmask(unsigned int irq)
{
	unsigned long mask;
    
	if (irq > 0x20) {
		/* OBIO/SBUS interrupts */
		irq &= 0x1f;
		mask = irq_mask[irq_xlate[irq]];
		if (!mask)
			printk("sun4m_get_irqmask: IRQ%d has no valid mask!\n",irq);
	} else {
		/* Soft Interrupts will come here.
		 * Currently there is no way to trigger them but I'm sure
		 * something could be cooked up.
		 */
		irq &= 0xf;
		mask = SUN4M_SOFT_INT(irq);
	}
	return mask;
}

static void sun4m_disable_irq(unsigned int irq_nr)
{
	unsigned long mask, flags;
	int cpu = smp_processor_id();

	mask = sun4m_get_irqmask(irq_nr);
	local_irq_save(flags);
	if (irq_nr > 15)
		sun4m_interrupts->set = mask;
	else
		sun4m_interrupts->cpu_intregs[cpu].set = mask;
	local_irq_restore(flags);    
}

static void sun4m_enable_irq(unsigned int irq_nr)
{
	unsigned long mask, flags;
	int cpu = smp_processor_id();

	/* Dreadful floppy hack. When we use 0x2b instead of
         * 0x0b the system blows (it starts to whistle!).
         * So we continue to use 0x0b. Fixme ASAP. --P3
         */
        if (irq_nr != 0x0b) {
		mask = sun4m_get_irqmask(irq_nr);
		local_irq_save(flags);
		if (irq_nr > 15)
			sun4m_interrupts->clear = mask;
		else
			sun4m_interrupts->cpu_intregs[cpu].clear = mask;
		local_irq_restore(flags);    
	} else {
		local_irq_save(flags);
		sun4m_interrupts->clear = SUN4M_INT_FLOPPY;
		local_irq_restore(flags);
	}
}

static unsigned long cpu_pil_to_imask[16] = {
/*0*/	0x00000000,
/*1*/	0x00000000,
/*2*/	SUN4M_INT_SBUS(0) | SUN4M_INT_VME(0),
/*3*/	SUN4M_INT_SBUS(1) | SUN4M_INT_VME(1),
/*4*/	SUN4M_INT_SCSI,
/*5*/	SUN4M_INT_SBUS(2) | SUN4M_INT_VME(2),
/*6*/	SUN4M_INT_ETHERNET,
/*7*/	SUN4M_INT_SBUS(3) | SUN4M_INT_VME(3),
/*8*/	SUN4M_INT_VIDEO,
/*9*/	SUN4M_INT_SBUS(4) | SUN4M_INT_VME(4) | SUN4M_INT_MODULE_ERR,
/*10*/	SUN4M_INT_REALTIME,
/*11*/	SUN4M_INT_SBUS(5) | SUN4M_INT_VME(5) | SUN4M_INT_FLOPPY,
/*12*/	SUN4M_INT_SERIAL | SUN4M_INT_KBDMS,
/*13*/	SUN4M_INT_AUDIO,
/*14*/	SUN4M_INT_E14,
/*15*/	0x00000000
};

/* We assume the caller has disabled local interrupts when these are called,
 * or else very bizarre behavior will result.
 */
static void sun4m_disable_pil_irq(unsigned int pil)
{
	sun4m_interrupts->set = cpu_pil_to_imask[pil];
}

static void sun4m_enable_pil_irq(unsigned int pil)
{
	sun4m_interrupts->clear = cpu_pil_to_imask[pil];
}

#ifdef CONFIG_SMP
static void sun4m_send_ipi(int cpu, int level)
{
	unsigned long mask;

	mask = sun4m_get_irqmask(level);
	sun4m_interrupts->cpu_intregs[cpu].set = mask;
}

static void sun4m_clear_ipi(int cpu, int level)
{
	unsigned long mask;

	mask = sun4m_get_irqmask(level);
	sun4m_interrupts->cpu_intregs[cpu].clear = mask;
}

static void sun4m_set_udt(int cpu)
{
	sun4m_interrupts->undirected_target = cpu;
}
#endif

#define OBIO_INTR	0x20
#define TIMER_IRQ  	(OBIO_INTR | 10)
#define PROFILE_IRQ	(OBIO_INTR | 14)

struct sun4m_timer_regs *sun4m_timers;
unsigned int lvl14_resolution = (((1000000/HZ) + 1) << 10);

static void sun4m_clear_clock_irq(void)
{
	volatile unsigned int clear_intr;
	clear_intr = sun4m_timers->l10_timer_limit;
}

static void sun4m_clear_profile_irq(int cpu)
{
	volatile unsigned int clear;
    
	clear = sun4m_timers->cpu_timers[cpu].l14_timer_limit;
}

static void sun4m_load_profile_irq(int cpu, unsigned int limit)
{
	sun4m_timers->cpu_timers[cpu].l14_timer_limit = limit;
}

char *sun4m_irq_itoa(unsigned int irq)
{
	static char buff[16];
	sprintf(buff, "%d", irq);
	return buff;
}

static void __init sun4m_init_timers(irqreturn_t (*counter_fn)(int, void *, struct pt_regs *))
{
	int reg_count, irq, cpu;
	struct linux_prom_registers cnt_regs[PROMREG_MAX];
	int obio_node, cnt_node;
	struct resource r;

	cnt_node = 0;
	if((obio_node =
	    prom_searchsiblings (prom_getchild(prom_root_node), "obio")) == 0 ||
	   (obio_node = prom_getchild (obio_node)) == 0 ||
	   (cnt_node = prom_searchsiblings (obio_node, "counter")) == 0) {
		prom_printf("Cannot find /obio/counter node\n");
		prom_halt();
	}
	reg_count = prom_getproperty(cnt_node, "reg",
				     (void *) cnt_regs, sizeof(cnt_regs));
	reg_count = (reg_count/sizeof(struct linux_prom_registers));
    
	/* Apply the obio ranges to the timer registers. */
	prom_apply_obio_ranges(cnt_regs, reg_count);
    
	cnt_regs[4].phys_addr = cnt_regs[reg_count-1].phys_addr;
	cnt_regs[4].reg_size = cnt_regs[reg_count-1].reg_size;
	cnt_regs[4].which_io = cnt_regs[reg_count-1].which_io;
	for(obio_node = 1; obio_node < 4; obio_node++) {
		cnt_regs[obio_node].phys_addr =
			cnt_regs[obio_node-1].phys_addr + PAGE_SIZE;
		cnt_regs[obio_node].reg_size = cnt_regs[obio_node-1].reg_size;
		cnt_regs[obio_node].which_io = cnt_regs[obio_node-1].which_io;
	}

	memset((char*)&r, 0, sizeof(struct resource));
	/* Map the per-cpu Counter registers. */
	r.flags = cnt_regs[0].which_io;
	r.start = cnt_regs[0].phys_addr;
	sun4m_timers = (struct sun4m_timer_regs *) sbus_ioremap(&r, 0,
	    PAGE_SIZE*SUN4M_NCPUS, "sun4m_cpu_cnt");
	/* Map the system Counter register. */
	/* XXX Here we expect consequent calls to yeld adjusent maps. */
	r.flags = cnt_regs[4].which_io;
	r.start = cnt_regs[4].phys_addr;
	sbus_ioremap(&r, 0, cnt_regs[4].reg_size, "sun4m_sys_cnt");

	sun4m_timers->l10_timer_limit =  (((1000000/HZ) + 1) << 10);
	master_l10_counter = &sun4m_timers->l10_cur_count;
	master_l10_limit = &sun4m_timers->l10_timer_limit;

	irq = request_irq(TIMER_IRQ,
			  counter_fn,
			  (SA_INTERRUPT | SA_STATIC_ALLOC),
			  "timer", NULL);
	if (irq) {
		prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
		prom_halt();
	}
   
	if (!cpu_find_by_instance(1, NULL, NULL)) {
		for(cpu = 0; cpu < 4; cpu++)
			sun4m_timers->cpu_timers[cpu].l14_timer_limit = 0;
		sun4m_interrupts->set = SUN4M_INT_E14;
	} else {
		sun4m_timers->cpu_timers[0].l14_timer_limit = 0;
	}
#ifdef CONFIG_SMP
	{
		unsigned long flags;
		extern unsigned long lvl14_save[4];
		struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];

		/* For SMP we use the level 14 ticker, however the bootup code
		 * has copied the firmwares level 14 vector into boot cpu's
		 * trap table, we must fix this now or we get squashed.
		 */
		local_irq_save(flags);
		trap_table->inst_one = lvl14_save[0];
		trap_table->inst_two = lvl14_save[1];
		trap_table->inst_three = lvl14_save[2];
		trap_table->inst_four = lvl14_save[3];
		local_flush_cache_all();
		local_irq_restore(flags);
	}
#endif
}

void __init sun4m_init_IRQ(void)
{
	int ie_node,i;
	struct linux_prom_registers int_regs[PROMREG_MAX];
	int num_regs;
	struct resource r;
	int mid;
    
	local_irq_disable();
	if((ie_node = prom_searchsiblings(prom_getchild(prom_root_node), "obio")) == 0 ||
	   (ie_node = prom_getchild (ie_node)) == 0 ||
	   (ie_node = prom_searchsiblings (ie_node, "interrupt")) == 0) {
		prom_printf("Cannot find /obio/interrupt node\n");
		prom_halt();
	}
	num_regs = prom_getproperty(ie_node, "reg", (char *) int_regs,
				    sizeof(int_regs));
	num_regs = (num_regs/sizeof(struct linux_prom_registers));
    
	/* Apply the obio ranges to these registers. */
	prom_apply_obio_ranges(int_regs, num_regs);
    
	int_regs[4].phys_addr = int_regs[num_regs-1].phys_addr;
	int_regs[4].reg_size = int_regs[num_regs-1].reg_size;
	int_regs[4].which_io = int_regs[num_regs-1].which_io;
	for(ie_node = 1; ie_node < 4; ie_node++) {
		int_regs[ie_node].phys_addr = int_regs[ie_node-1].phys_addr + PAGE_SIZE;
		int_regs[ie_node].reg_size = int_regs[ie_node-1].reg_size;
		int_regs[ie_node].which_io = int_regs[ie_node-1].which_io;
	}

	memset((char *)&r, 0, sizeof(struct resource));
	/* Map the interrupt registers for all possible cpus. */
	r.flags = int_regs[0].which_io;
	r.start = int_regs[0].phys_addr;
	sun4m_interrupts = (struct sun4m_intregs *) sbus_ioremap(&r, 0,
	    PAGE_SIZE*SUN4M_NCPUS, "interrupts_percpu");

	/* Map the system interrupt control registers. */
	r.flags = int_regs[4].which_io;
	r.start = int_regs[4].phys_addr;
	sbus_ioremap(&r, 0, int_regs[4].reg_size, "interrupts_system");

	sun4m_interrupts->set = ~SUN4M_INT_MASKALL;
	for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++)
		sun4m_interrupts->cpu_intregs[mid].clear = ~0x17fff;

	if (!cpu_find_by_instance(1, NULL, NULL)) {
		/* system wide interrupts go to cpu 0, this should always
		 * be safe because it is guaranteed to be fitted or OBP doesn't
		 * come up
		 *
		 * Not sure, but writing here on SLAVIO systems may puke
		 * so I don't do it unless there is more than 1 cpu.
		 */
		irq_rcvreg = (unsigned long *)
				&sun4m_interrupts->undirected_target;
		sun4m_interrupts->undirected_target = 0;
	}
	BTFIXUPSET_CALL(sbint_to_irq, sun4m_sbint_to_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(enable_irq, sun4m_enable_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(disable_irq, sun4m_disable_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(enable_pil_irq, sun4m_enable_pil_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(disable_pil_irq, sun4m_disable_pil_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(clear_clock_irq, sun4m_clear_clock_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(clear_profile_irq, sun4m_clear_profile_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(load_profile_irq, sun4m_load_profile_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(__irq_itoa, sun4m_irq_itoa, BTFIXUPCALL_NORM);
	sparc_init_timers = sun4m_init_timers;
#ifdef CONFIG_SMP
	BTFIXUPSET_CALL(set_cpu_int, sun4m_send_ipi, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(clear_cpu_int, sun4m_clear_ipi, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(set_irq_udt, sun4m_set_udt, BTFIXUPCALL_NORM);
#endif
	/* Cannot enable interrupts until OBP ticker is disabled. */
}