aboutsummaryrefslogtreecommitdiffstats
path: root/arch/m68k/atari/ataints.c
blob: 3d2b63bedf0589c67cdf0471007157bb913f18ac (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
/*
 * arch/m68k/atari/ataints.c -- Atari Linux interrupt handling code
 *
 * 5/2/94 Roman Hodek:
 *  Added support for TT interrupts; setup for TT SCU (may someone has
 *  twiddled there and we won't get the right interrupts :-()
 *
 *  Major change: The device-independent code in m68k/ints.c didn't know
 *  about non-autovec ints yet. It hardcoded the number of possible ints to
 *  7 (IRQ1...IRQ7). But the Atari has lots of non-autovec ints! I made the
 *  number of possible ints a constant defined in interrupt.h, which is
 *  47 for the Atari. So we can call request_irq() for all Atari interrupts
 *  just the normal way. Additionally, all vectors >= 48 are initialized to
 *  call trap() instead of inthandler(). This must be changed here, too.
 *
 * 1995-07-16 Lars Brinkhoff <f93labr@dd.chalmers.se>:
 *  Corrected a bug in atari_add_isr() which rejected all SCC
 *  interrupt sources if there were no TT MFP!
 *
 * 12/13/95: New interface functions atari_level_triggered_int() and
 *  atari_register_vme_int() as support for level triggered VME interrupts.
 *
 * 02/12/96: (Roman)
 *  Total rewrite of Atari interrupt handling, for new scheme see comments
 *  below.
 *
 * 1996-09-03 lars brinkhoff <f93labr@dd.chalmers.se>:
 *  Added new function atari_unregister_vme_int(), and
 *  modified atari_register_vme_int() as well as IS_VALID_INTNO()
 *  to work with it.
 *
 * 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.
 *
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/kernel_stat.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/module.h>
#include <linux/irq.h>

#include <asm/traps.h>

#include <asm/atarihw.h>
#include <asm/atariints.h>
#include <asm/atari_stdma.h>
#include <asm/irq.h>
#include <asm/entry.h>
#include <asm/io.h>


/*
 * Atari interrupt handling scheme:
 * --------------------------------
 *
 * All interrupt source have an internal number (defined in
 * <asm/atariints.h>): Autovector interrupts are 1..7, then follow ST-MFP,
 * TT-MFP, SCC, and finally VME interrupts. Vector numbers for the latter can
 * be allocated by atari_register_vme_int().
 */

/*
 * Bitmap for free interrupt vector numbers
 * (new vectors starting from 0x70 can be allocated by
 * atari_register_vme_int())
 */
static int free_vme_vec_bitmap;

/* GK:
 * HBL IRQ handler for Falcon. Nobody needs it :-)
 * ++andreas: raise ipl to disable further HBLANK interrupts.
 */
asmlinkage void falcon_hblhandler(void);
asm(".text\n"
__ALIGN_STR "\n\t"
"falcon_hblhandler:\n\t"
	"orw	#0x200,%sp@\n\t"	/* set saved ipl to 2 */
	"rte");

extern void atari_microwire_cmd(int cmd);

static unsigned int atari_irq_startup(struct irq_data *data)
{
	unsigned int irq = data->irq;

	m68k_irq_startup(data);
	atari_turnon_irq(irq);
	atari_enable_irq(irq);
	return 0;
}

static void atari_irq_shutdown(struct irq_data *data)
{
	unsigned int irq = data->irq;

	atari_disable_irq(irq);
	atari_turnoff_irq(irq);
	m68k_irq_shutdown(data);

	if (irq == IRQ_AUTO_4)
	    vectors[VEC_INT4] = falcon_hblhandler;
}

static void atari_irq_enable(struct irq_data *data)
{
	atari_enable_irq(data->irq);
}

static void atari_irq_disable(struct irq_data *data)
{
	atari_disable_irq(data->irq);
}

static struct irq_chip atari_irq_chip = {
	.name		= "atari",
	.irq_startup	= atari_irq_startup,
	.irq_shutdown	= atari_irq_shutdown,
	.irq_enable	= atari_irq_enable,
	.irq_disable	= atari_irq_disable,
};

/*
 * ST-MFP timer D chained interrupts - each driver gets its own timer
 * interrupt instance.
 */

struct mfptimerbase {
	volatile struct MFP *mfp;
	unsigned char mfp_mask, mfp_data;
	unsigned short int_mask;
	int handler_irq, mfptimer_irq, server_irq;
	char *name;
} stmfp_base = {
	.mfp		= &st_mfp,
	.int_mask	= 0x0,
	.handler_irq	= IRQ_MFP_TIMD,
	.mfptimer_irq	= IRQ_MFP_TIMER1,
	.name		= "MFP Timer D"
};

static irqreturn_t mfptimer_handler(int irq, void *dev_id)
{
	struct mfptimerbase *base = dev_id;
	int mach_irq;
	unsigned char ints;

	mach_irq = base->mfptimer_irq;
	ints = base->int_mask;
	for (; ints; mach_irq++, ints >>= 1) {
		if (ints & 1)
			generic_handle_irq(mach_irq);
	}
	return IRQ_HANDLED;
}


static void atari_mfptimer_enable(struct irq_data *data)
{
	int mfp_num = data->irq - IRQ_MFP_TIMER1;
	stmfp_base.int_mask |= 1 << mfp_num;
	atari_enable_irq(IRQ_MFP_TIMD);
}

static void atari_mfptimer_disable(struct irq_data *data)
{
	int mfp_num = data->irq - IRQ_MFP_TIMER1;
	stmfp_base.int_mask &= ~(1 << mfp_num);
	if (!stmfp_base.int_mask)
		atari_disable_irq(IRQ_MFP_TIMD);
}

static struct irq_chip atari_mfptimer_chip = {
	.name		= "timer_d",
	.irq_enable	= atari_mfptimer_enable,
	.irq_disable	= atari_mfptimer_disable,
};


/*
 * EtherNAT CPLD interrupt handling
 * CPLD interrupt register is at phys. 0x80000023
 * Need this mapped in at interrupt startup time
 * Possibly need this mapped on demand anyway -
 * EtherNAT USB driver needs to disable IRQ before
 * startup!
 */

static unsigned char *enat_cpld;

static unsigned int atari_ethernat_startup(struct irq_data *data)
{
	int enat_num = 140 - data->irq + 1;

	m68k_irq_startup(data);
	/*
	* map CPLD interrupt register
	*/
	if (!enat_cpld)
		enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2);
	/*
	 * do _not_ enable the USB chip interrupt here - causes interrupt storm
	 * and triggers dead interrupt watchdog
	 * Need to reset the USB chip to a sane state in early startup before
	 * removing this hack
	 */
	if (enat_num == 1)
		*enat_cpld |= 1 << enat_num;

	return 0;
}

static void atari_ethernat_enable(struct irq_data *data)
{
	int enat_num = 140 - data->irq + 1;
	/*
	* map CPLD interrupt register
	*/
	if (!enat_cpld)
		enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2);
	*enat_cpld |= 1 << enat_num;
}

static void atari_ethernat_disable(struct irq_data *data)
{
	int enat_num = 140 - data->irq + 1;
	/*
	* map CPLD interrupt register
	*/
	if (!enat_cpld)
		enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2);
	*enat_cpld &= ~(1 << enat_num);
}

static void atari_ethernat_shutdown(struct irq_data *data)
{
	int enat_num = 140 - data->irq + 1;
	if (enat_cpld) {
		*enat_cpld &= ~(1 << enat_num);
		iounmap(enat_cpld);
		enat_cpld = NULL;
	}
}

static struct irq_chip atari_ethernat_chip = {
	.name		= "ethernat",
	.irq_startup	= atari_ethernat_startup,
	.irq_shutdown	= atari_ethernat_shutdown,
	.irq_enable	= atari_ethernat_enable,
	.irq_disable	= atari_ethernat_disable,
};

/*
 * void atari_init_IRQ (void)
 *
 * Parameters:	None
 *
 * Returns:	Nothing
 *
 * This function should be called during kernel startup to initialize
 * the atari IRQ handling routines.
 */

void __init atari_init_IRQ(void)
{
	m68k_setup_user_interrupt(VEC_USER, NUM_ATARI_SOURCES - IRQ_USER);
	m68k_setup_irq_controller(&atari_irq_chip, handle_simple_irq, 1,
				  NUM_ATARI_SOURCES - 1);

	/* Initialize the MFP(s) */

#ifdef ATARI_USE_SOFTWARE_EOI
	st_mfp.vec_adr  = 0x48;	/* Software EOI-Mode */
#else
	st_mfp.vec_adr  = 0x40;	/* Automatic EOI-Mode */
#endif
	st_mfp.int_en_a = 0x00;	/* turn off MFP-Ints */
	st_mfp.int_en_b = 0x00;
	st_mfp.int_mk_a = 0xff;	/* no Masking */
	st_mfp.int_mk_b = 0xff;

	if (ATARIHW_PRESENT(TT_MFP)) {
#ifdef ATARI_USE_SOFTWARE_EOI
		tt_mfp.vec_adr  = 0x58;		/* Software EOI-Mode */
#else
		tt_mfp.vec_adr  = 0x50;		/* Automatic EOI-Mode */
#endif
		tt_mfp.int_en_a = 0x00;		/* turn off MFP-Ints */
		tt_mfp.int_en_b = 0x00;
		tt_mfp.int_mk_a = 0xff;		/* no Masking */
		tt_mfp.int_mk_b = 0xff;
	}

	if (ATARIHW_PRESENT(SCC) && !atari_SCC_reset_done) {
		atari_scc.cha_a_ctrl = 9;
		MFPDELAY();
		atari_scc.cha_a_ctrl = (char) 0xc0; /* hardware reset */
	}

	if (ATARIHW_PRESENT(SCU)) {
		/* init the SCU if present */
		tt_scu.sys_mask = 0x10;		/* enable VBL (for the cursor) and
									 * disable HSYNC interrupts (who
									 * needs them?)  MFP and SCC are
									 * enabled in VME mask
									 */
		tt_scu.vme_mask = 0x60;		/* enable MFP and SCC ints */
	} else {
		/* If no SCU and no Hades, the HSYNC interrupt needs to be
		 * disabled this way. (Else _inthandler in kernel/sys_call.S
		 * gets overruns)
		 */

		vectors[VEC_INT2] = falcon_hblhandler;
		vectors[VEC_INT4] = falcon_hblhandler;
	}

	if (ATARIHW_PRESENT(PCM_8BIT) && ATARIHW_PRESENT(MICROWIRE)) {
		/* Initialize the LM1992 Sound Controller to enable
		   the PSG sound.  This is misplaced here, it should
		   be in an atasound_init(), that doesn't exist yet. */
		atari_microwire_cmd(MW_LM1992_PSG_HIGH);
	}

	stdma_init();

	/* Initialize the PSG: all sounds off, both ports output */
	sound_ym.rd_data_reg_sel = 7;
	sound_ym.wd_data = 0xff;

	m68k_setup_irq_controller(&atari_mfptimer_chip, handle_simple_irq,
				  IRQ_MFP_TIMER1, 8);

	irq_set_status_flags(IRQ_MFP_TIMER1, IRQ_IS_POLLED);
	irq_set_status_flags(IRQ_MFP_TIMER2, IRQ_IS_POLLED);

	/* prepare timer D data for use as poll interrupt */
	/* set Timer D data Register - needs to be > 0 */
	st_mfp.tim_dt_d = 254;	/* < 100 Hz */
	/* start timer D, div = 1:100 */
	st_mfp.tim_ct_cd = (st_mfp.tim_ct_cd & 0xf0) | 0x6;

	/* request timer D dispatch handler */
	if (request_irq(IRQ_MFP_TIMD, mfptimer_handler, IRQF_SHARED,
			stmfp_base.name, &stmfp_base))
		pr_err("Couldn't register %s interrupt\n", stmfp_base.name);

	/*
	 * EtherNAT ethernet / USB interrupt handlers
	 */

	m68k_setup_irq_controller(&atari_ethernat_chip, handle_simple_irq,
				  139, 2);
}


/*
 * atari_register_vme_int() returns the number of a free interrupt vector for
 * hardware with a programmable int vector (probably a VME board).
 */

unsigned int atari_register_vme_int(void)
{
	int i;

	for (i = 0; i < 32; i++)
		if ((free_vme_vec_bitmap & (1 << i)) == 0)
			break;

	if (i == 16)
		return 0;

	free_vme_vec_bitmap |= 1 << i;
	return VME_SOURCE_BASE + i;
}
EXPORT_SYMBOL(atari_register_vme_int);


void atari_unregister_vme_int(unsigned int irq)
{
	if (irq >= VME_SOURCE_BASE && irq < VME_SOURCE_BASE + VME_MAX_SOURCES) {
		irq -= VME_SOURCE_BASE;
		free_vme_vec_bitmap &= ~(1 << irq);
	}
}
EXPORT_SYMBOL(atari_unregister_vme_int);