aboutsummaryrefslogtreecommitdiff
path: root/arch/m68knommu/platform/68360/ints.c
blob: 4df3c146eb74a62a405b3a88fb375c71c91500b9 (plain)
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
/*
 * linux/arch/$(ARCH)/platform/$(PLATFORM)/ints.c
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 *
 * Copyright (c) 2000  Michael Leslie <mleslie@lineo.com>
 * Copyright (c) 1996 Roman Zippel
 * Copyright (c) 1999 D. Jeff Dionne <jeff@uclinux.org>
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/errno.h>

#include <asm/system.h>
#include <asm/irq.h>
#include <asm/irqnode.h>
#include <asm/traps.h>
#include <asm/io.h>
#include <asm/machdep.h>
#include <asm/setup.h>
#include <asm/m68360.h>

/* from quicc/commproc.c: */
extern QUICC *pquicc;
extern void cpm_interrupt_init(void);

#define INTERNAL_IRQS (96)

/* assembler routines */
asmlinkage void system_call(void);
asmlinkage void buserr(void);
asmlinkage void trap(void);
asmlinkage irqreturn_t bad_interrupt(void);
asmlinkage irqreturn_t inthandler(void);

extern void *_ramvec[];

/* The number of spurious interrupts */
volatile unsigned int num_spurious;
unsigned int local_irq_count[NR_CPUS];

/* irq node variables for the 32 (potential) on chip sources */
static irq_node_t int_irq_list[INTERNAL_IRQS];

static short int_irq_ablecount[INTERNAL_IRQS];

/*
 * This function should be called during kernel startup to initialize
 * IRQ handling routines.
 */

void init_IRQ(void)
{
	int i;
	int vba = (CPM_VECTOR_BASE<<4);

	/* set up the vectors */
	_ramvec[2] = buserr;
	_ramvec[3] = trap;
	_ramvec[4] = trap;
	_ramvec[5] = trap;
	_ramvec[6] = trap;
	_ramvec[7] = trap;
	_ramvec[8] = trap;
	_ramvec[9] = trap;
	_ramvec[10] = trap;
	_ramvec[11] = trap;
	_ramvec[12] = trap;
	_ramvec[13] = trap;
	_ramvec[14] = trap;
	_ramvec[15] = trap;

	_ramvec[32] = system_call;
	_ramvec[33] = trap;


	cpm_interrupt_init();

	/* set up CICR for vector base address and irq level */
	/* irl = 4, hp = 1f - see MC68360UM p 7-377 */
	pquicc->intr_cicr = 0x00e49f00 | vba;

	/* CPM interrupt vectors: (p 7-376) */
	_ramvec[vba+CPMVEC_ERROR]       = bad_interrupt; /* Error */
	_ramvec[vba+CPMVEC_PIO_PC11]    = inthandler;   /* pio - pc11 */
	_ramvec[vba+CPMVEC_PIO_PC10]    = inthandler;   /* pio - pc10 */
	_ramvec[vba+CPMVEC_SMC2]        = inthandler;   /* smc2/pip */
	_ramvec[vba+CPMVEC_SMC1]        = inthandler;   /* smc1 */
	_ramvec[vba+CPMVEC_SPI]         = inthandler;   /* spi */
	_ramvec[vba+CPMVEC_PIO_PC9]     = inthandler;   /* pio - pc9 */
	_ramvec[vba+CPMVEC_TIMER4]      = inthandler;   /* timer 4 */
	_ramvec[vba+CPMVEC_RESERVED1]   = inthandler;   /* reserved */
	_ramvec[vba+CPMVEC_PIO_PC8]     = inthandler;   /* pio - pc8 */
	_ramvec[vba+CPMVEC_PIO_PC7]     = inthandler;  /* pio - pc7 */
	_ramvec[vba+CPMVEC_PIO_PC6]     = inthandler;  /* pio - pc6 */
	_ramvec[vba+CPMVEC_TIMER3]      = inthandler;  /* timer 3 */
	_ramvec[vba+CPMVEC_RISCTIMER]   = inthandler;  /* reserved */
	_ramvec[vba+CPMVEC_PIO_PC5]     = inthandler;  /* pio - pc5 */
	_ramvec[vba+CPMVEC_PIO_PC4]     = inthandler;  /* pio - pc4 */
	_ramvec[vba+CPMVEC_RESERVED2]   = inthandler;  /* reserved */
	_ramvec[vba+CPMVEC_RISCTIMER]   = inthandler;  /* timer table */
	_ramvec[vba+CPMVEC_TIMER2]      = inthandler;  /* timer 2 */
	_ramvec[vba+CPMVEC_RESERVED3]   = inthandler;  /* reserved */
	_ramvec[vba+CPMVEC_IDMA2]       = inthandler;  /* idma 2 */
	_ramvec[vba+CPMVEC_IDMA1]       = inthandler;  /* idma 1 */
	_ramvec[vba+CPMVEC_SDMA_CB_ERR] = inthandler;  /* sdma channel bus error */
	_ramvec[vba+CPMVEC_PIO_PC3]     = inthandler;  /* pio - pc3 */
	_ramvec[vba+CPMVEC_PIO_PC2]     = inthandler;  /* pio - pc2 */
	/* _ramvec[vba+CPMVEC_TIMER1]      = cpm_isr_timer1; */  /* timer 1 */
	_ramvec[vba+CPMVEC_TIMER1]      = inthandler;  /* timer 1 */
	_ramvec[vba+CPMVEC_PIO_PC1]     = inthandler;  /* pio - pc1 */
	_ramvec[vba+CPMVEC_SCC4]        = inthandler;  /* scc 4 */
	_ramvec[vba+CPMVEC_SCC3]        = inthandler;  /* scc 3 */
	_ramvec[vba+CPMVEC_SCC2]        = inthandler;  /* scc 2 */
	_ramvec[vba+CPMVEC_SCC1]        = inthandler;  /* scc 1 */
	_ramvec[vba+CPMVEC_PIO_PC0]     = inthandler;  /* pio - pc0 */


	/* turn off all CPM interrupts */
	pquicc->intr_cimr = 0x00000000;

	/* initialize handlers */
	for (i = 0; i < INTERNAL_IRQS; i++) {
		int_irq_list[i].handler = NULL;
		int_irq_list[i].flags   = IRQ_FLG_STD;
		int_irq_list[i].dev_id  = NULL;
		int_irq_list[i].devname = NULL;
	}
}

#if 0
void M68360_insert_irq(irq_node_t **list, irq_node_t *node)
{
	unsigned long flags;
	irq_node_t *cur;

	if (!node->dev_id)
		printk(KERN_INFO "%s: Warning: dev_id of %s is zero\n",
		       __FUNCTION__, node->devname);

	local_irq_save(flags);

	cur = *list;

	while (cur) {
		list = &cur->next;
		cur = cur->next;
	}

	node->next = cur;
	*list = node;

	local_irq_restore(flags);
}

void M68360_delete_irq(irq_node_t **list, void *dev_id)
{
	unsigned long flags;
	irq_node_t *node;

	local_irq_save(flags);

	for (node = *list; node; list = &node->next, node = *list) {
		if (node->dev_id == dev_id) {
			*list = node->next;
			/* Mark it as free. */
			node->handler = NULL;
			local_irq_restore(flags);
			return;
		}
	}
	local_irq_restore(flags);
	printk (KERN_INFO "%s: tried to remove invalid irq\n", __FUNCTION__);
}
#endif

int request_irq(
	unsigned int irq,
	irqreturn_t (*handler)(int, void *, struct pt_regs *),
	unsigned long flags,
	const char *devname,
	void *dev_id)
{
	int mask = (1<<irq);

	irq += (CPM_VECTOR_BASE<<4);

	if (irq >= INTERNAL_IRQS) {
		printk (KERN_ERR "%s: Unknown IRQ %d from %s\n", __FUNCTION__, irq, devname);
		return -ENXIO;
	}

	if (!(int_irq_list[irq].flags & IRQ_FLG_STD)) {
		if (int_irq_list[irq].flags & IRQ_FLG_LOCK) {
			printk(KERN_ERR "%s: IRQ %d from %s is not replaceable\n",
			       __FUNCTION__, irq, int_irq_list[irq].devname);
			return -EBUSY;
		}
		if (flags & IRQ_FLG_REPLACE) {
			printk(KERN_ERR "%s: %s can't replace IRQ %d from %s\n",
			       __FUNCTION__, devname, irq, int_irq_list[irq].devname);
			return -EBUSY;
		}
	}
	int_irq_list[irq].handler = handler;
	int_irq_list[irq].flags   = flags;
	int_irq_list[irq].dev_id  = dev_id;
	int_irq_list[irq].devname = devname;

	/* enable in the CIMR */
	if (!int_irq_ablecount[irq])
		pquicc->intr_cimr |= mask;
	/*      *(volatile unsigned long *)0xfffff304 &= ~(1<<irq); */

	return 0;
}

EXPORT_SYMBOL(request_irq);

void free_irq(unsigned int irq, void *dev_id)
{
	if (irq >= INTERNAL_IRQS) {
		printk (KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
		return;
	}

	if (int_irq_list[irq].dev_id != dev_id)
		printk(KERN_INFO "%s: removing probably wrong IRQ %d from %s\n",
		       __FUNCTION__, irq, int_irq_list[irq].devname);
	int_irq_list[irq].handler = NULL;
	int_irq_list[irq].flags   = IRQ_FLG_STD;
	int_irq_list[irq].dev_id  = NULL;
	int_irq_list[irq].devname = NULL;

	*(volatile unsigned long *)0xfffff304 |= 1<<irq;
}

EXPORT_SYMBOL(free_irq);

#if 0
/*
 * Enable/disable a particular machine specific interrupt source.
 * Note that this may affect other interrupts in case of a shared interrupt.
 * This function should only be called for a _very_ short time to change some
 * internal data, that may not be changed by the interrupt at the same time.
 * int_(enable|disable)_irq calls may also be nested.
 */
void M68360_enable_irq(unsigned int irq)
{
	if (irq >= INTERNAL_IRQS) {
		printk(KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
		return;
	}

	if (--int_irq_ablecount[irq])
		return;

	/* enable the interrupt */
	*(volatile unsigned long *)0xfffff304 &= ~(1<<irq);
}

void M68360_disable_irq(unsigned int irq)
{
	if (irq >= INTERNAL_IRQS) {
		printk(KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
		return;
	}

	if (int_irq_ablecount[irq]++)
		return;

	/* disable the interrupt */
	*(volatile unsigned long *)0xfffff304 |= 1<<irq;
}
#endif

int show_interrupts(struct seq_file *p, void *v)
{
	int i = *(loff_t *) v;

	if (i < NR_IRQS) {
		if (int_irq_list[i].devname) {
			seq_printf(p, "%3d: %10u ", i, kstat_cpu(0).irqs[i]);
			if (int_irq_list[i].flags & IRQ_FLG_LOCK)
				seq_printf(p, "L ");
			else
				seq_printf(p, "  ");
			seq_printf(p, "%s\n", int_irq_list[i].devname);
		}
	}
	if (i == NR_IRQS)
		seq_printf(p, "   : %10u   spurious\n", num_spurious);

	return 0;
}

/* The 68k family did not have a good way to determine the source
 * of interrupts until later in the family.  The EC000 core does
 * not provide the vector number on the stack, we vector everything
 * into one vector and look in the blasted mask register...
 * This code is designed to be fast, almost constant time, not clean!
 */
void process_int(int vec, struct pt_regs *fp)
{
	int irq;
	int mask;

	/* unsigned long pend = *(volatile unsigned long *)0xfffff30c; */

	/* irq = vec + (CPM_VECTOR_BASE<<4); */
	irq = vec;

	/* unsigned long pend = *(volatile unsigned long *)pquicc->intr_cipr; */

	/* Bugger all that weirdness. For the moment, I seem to know where I came from;
	 * vec is passed from a specific ISR, so I'll use it. */

	if (int_irq_list[irq].handler) {
		int_irq_list[irq].handler(irq , int_irq_list[irq].dev_id, fp);
		kstat_cpu(0).irqs[irq]++;
		pquicc->intr_cisr = (1 << vec); /* indicate that irq has been serviced */
	} else {
		printk(KERN_ERR "unregistered interrupt %d!\nTurning it off in the CIMR...\n", irq);
		/* *(volatile unsigned long *)0xfffff304 |= mask; */
		pquicc->intr_cimr &= ~(1 << vec);
		num_spurious += 1;
	}
	return(IRQ_HANDLED);
}