1/*
2 * arch/m68k/atari/ataints.c -- Atari Linux interrupt handling code
3 *
4 * 5/2/94 Roman Hodek:
5 *  Added support for TT interrupts; setup for TT SCU (may someone has
6 *  twiddled there and we won't get the right interrupts :-()
7 *
8 *  Major change: The device-independent code in m68k/ints.c didn't know
9 *  about non-autovec ints yet. It hardcoded the number of possible ints to
10 *  7 (IRQ1...IRQ7). But the Atari has lots of non-autovec ints! I made the
11 *  number of possible ints a constant defined in interrupt.h, which is
12 *  47 for the Atari. So we can call request_irq() for all Atari interrupts
13 *  just the normal way. Additionally, all vectors >= 48 are initialized to
14 *  call trap() instead of inthandler(). This must be changed here, too.
15 *
16 * 1995-07-16 Lars Brinkhoff <f93labr@dd.chalmers.se>:
17 *  Corrected a bug in atari_add_isr() which rejected all SCC
18 *  interrupt sources if there were no TT MFP!
19 *
20 * 12/13/95: New interface functions atari_level_triggered_int() and
21 *  atari_register_vme_int() as support for level triggered VME interrupts.
22 *
23 * 02/12/96: (Roman)
24 *  Total rewrite of Atari interrupt handling, for new scheme see comments
25 *  below.
26 *
27 * 1996-09-03 lars brinkhoff <f93labr@dd.chalmers.se>:
28 *  Added new function atari_unregister_vme_int(), and
29 *  modified atari_register_vme_int() as well as IS_VALID_INTNO()
30 *  to work with it.
31 *
32 * This file is subject to the terms and conditions of the GNU General Public
33 * License.  See the file COPYING in the main directory of this archive
34 * for more details.
35 *
36 */
37
38#include <linux/types.h>
39#include <linux/kernel.h>
40#include <linux/kernel_stat.h>
41#include <linux/init.h>
42#include <linux/seq_file.h>
43#include <linux/module.h>
44#include <linux/irq.h>
45
46#include <asm/traps.h>
47
48#include <asm/atarihw.h>
49#include <asm/atariints.h>
50#include <asm/atari_stdma.h>
51#include <asm/irq.h>
52#include <asm/entry.h>
53#include <asm/io.h>
54
55#include "atari.h"
56
57/*
58 * Atari interrupt handling scheme:
59 * --------------------------------
60 *
61 * All interrupt source have an internal number (defined in
62 * <asm/atariints.h>): Autovector interrupts are 1..7, then follow ST-MFP,
63 * TT-MFP, SCC, and finally VME interrupts. Vector numbers for the latter can
64 * be allocated by atari_register_vme_int().
65 */
66
67/*
68 * Bitmap for free interrupt vector numbers
69 * (new vectors starting from 0x70 can be allocated by
70 * atari_register_vme_int())
71 */
72static int free_vme_vec_bitmap;
73
74/* GK:
75 * HBL IRQ handler for Falcon. Nobody needs it :-)
76 * ++andreas: raise ipl to disable further HBLANK interrupts.
77 */
78asmlinkage void falcon_hblhandler(void);
79asm(".text\n"
80__ALIGN_STR "\n\t"
81"falcon_hblhandler:\n\t"
82	"orw	#0x200,%sp@\n\t"	/* set saved ipl to 2 */
83	"rte");
84
85static unsigned int atari_irq_startup(struct irq_data *data)
86{
87	unsigned int irq = data->irq;
88
89	m68k_irq_startup(data);
90	atari_turnon_irq(irq);
91	atari_enable_irq(irq);
92	return 0;
93}
94
95static void atari_irq_shutdown(struct irq_data *data)
96{
97	unsigned int irq = data->irq;
98
99	atari_disable_irq(irq);
100	atari_turnoff_irq(irq);
101	m68k_irq_shutdown(data);
102
103	if (irq == IRQ_AUTO_4)
104	    vectors[VEC_INT4] = falcon_hblhandler;
105}
106
107static void atari_irq_enable(struct irq_data *data)
108{
109	atari_enable_irq(data->irq);
110}
111
112static void atari_irq_disable(struct irq_data *data)
113{
114	atari_disable_irq(data->irq);
115}
116
117static struct irq_chip atari_irq_chip = {
118	.name		= "atari",
119	.irq_startup	= atari_irq_startup,
120	.irq_shutdown	= atari_irq_shutdown,
121	.irq_enable	= atari_irq_enable,
122	.irq_disable	= atari_irq_disable,
123};
124
125/*
126 * ST-MFP timer D chained interrupts - each driver gets its own timer
127 * interrupt instance.
128 */
129
130struct mfptimerbase {
131	volatile struct MFP *mfp;
132	unsigned char mfp_mask, mfp_data;
133	unsigned short int_mask;
134	int handler_irq, mfptimer_irq, server_irq;
135	char *name;
136} stmfp_base = {
137	.mfp		= &st_mfp,
138	.int_mask	= 0x0,
139	.handler_irq	= IRQ_MFP_TIMD,
140	.mfptimer_irq	= IRQ_MFP_TIMER1,
141	.name		= "MFP Timer D"
142};
143
144static irqreturn_t mfp_timer_d_handler(int irq, void *dev_id)
145{
146	struct mfptimerbase *base = dev_id;
147	int mach_irq;
148	unsigned char ints;
149
150	mach_irq = base->mfptimer_irq;
151	ints = base->int_mask;
152	for (; ints; mach_irq++, ints >>= 1) {
153		if (ints & 1)
154			generic_handle_irq(mach_irq);
155	}
156	return IRQ_HANDLED;
157}
158
159
160static void atari_mfptimer_enable(struct irq_data *data)
161{
162	int mfp_num = data->irq - IRQ_MFP_TIMER1;
163	stmfp_base.int_mask |= 1 << mfp_num;
164	atari_enable_irq(IRQ_MFP_TIMD);
165}
166
167static void atari_mfptimer_disable(struct irq_data *data)
168{
169	int mfp_num = data->irq - IRQ_MFP_TIMER1;
170	stmfp_base.int_mask &= ~(1 << mfp_num);
171	if (!stmfp_base.int_mask)
172		atari_disable_irq(IRQ_MFP_TIMD);
173}
174
175static struct irq_chip atari_mfptimer_chip = {
176	.name		= "timer_d",
177	.irq_enable	= atari_mfptimer_enable,
178	.irq_disable	= atari_mfptimer_disable,
179};
180
181
182/*
183 * EtherNAT CPLD interrupt handling
184 * CPLD interrupt register is at phys. 0x80000023
185 * Need this mapped in at interrupt startup time
186 * Possibly need this mapped on demand anyway -
187 * EtherNAT USB driver needs to disable IRQ before
188 * startup!
189 */
190
191static unsigned char *enat_cpld;
192
193static unsigned int atari_ethernat_startup(struct irq_data *data)
194{
195	int enat_num = 140 - data->irq + 1;
196
197	m68k_irq_startup(data);
198	/*
199	* map CPLD interrupt register
200	*/
201	if (!enat_cpld)
202		enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2);
203	/*
204	 * do _not_ enable the USB chip interrupt here - causes interrupt storm
205	 * and triggers dead interrupt watchdog
206	 * Need to reset the USB chip to a sane state in early startup before
207	 * removing this hack
208	 */
209	if (enat_num == 1)
210		*enat_cpld |= 1 << enat_num;
211
212	return 0;
213}
214
215static void atari_ethernat_enable(struct irq_data *data)
216{
217	int enat_num = 140 - data->irq + 1;
218	/*
219	* map CPLD interrupt register
220	*/
221	if (!enat_cpld)
222		enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2);
223	*enat_cpld |= 1 << enat_num;
224}
225
226static void atari_ethernat_disable(struct irq_data *data)
227{
228	int enat_num = 140 - data->irq + 1;
229	/*
230	* map CPLD interrupt register
231	*/
232	if (!enat_cpld)
233		enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2);
234	*enat_cpld &= ~(1 << enat_num);
235}
236
237static void atari_ethernat_shutdown(struct irq_data *data)
238{
239	int enat_num = 140 - data->irq + 1;
240	if (enat_cpld) {
241		*enat_cpld &= ~(1 << enat_num);
242		iounmap(enat_cpld);
243		enat_cpld = NULL;
244	}
245}
246
247static struct irq_chip atari_ethernat_chip = {
248	.name		= "ethernat",
249	.irq_startup	= atari_ethernat_startup,
250	.irq_shutdown	= atari_ethernat_shutdown,
251	.irq_enable	= atari_ethernat_enable,
252	.irq_disable	= atari_ethernat_disable,
253};
254
255/*
256 * void atari_init_IRQ (void)
257 *
258 * Parameters:	None
259 *
260 * Returns:	Nothing
261 *
262 * This function should be called during kernel startup to initialize
263 * the atari IRQ handling routines.
264 */
265
266void __init atari_init_IRQ(void)
267{
268	m68k_setup_user_interrupt(VEC_USER, NUM_ATARI_SOURCES - IRQ_USER);
269	m68k_setup_irq_controller(&atari_irq_chip, handle_simple_irq, 1,
270				  NUM_ATARI_SOURCES - 1);
271
272	/* Initialize the MFP(s) */
273
274#ifdef ATARI_USE_SOFTWARE_EOI
275	st_mfp.vec_adr  = 0x48;	/* Software EOI-Mode */
276#else
277	st_mfp.vec_adr  = 0x40;	/* Automatic EOI-Mode */
278#endif
279	st_mfp.int_en_a = 0x00;	/* turn off MFP-Ints */
280	st_mfp.int_en_b = 0x00;
281	st_mfp.int_mk_a = 0xff;	/* no Masking */
282	st_mfp.int_mk_b = 0xff;
283
284	if (ATARIHW_PRESENT(TT_MFP)) {
285#ifdef ATARI_USE_SOFTWARE_EOI
286		tt_mfp.vec_adr  = 0x58;		/* Software EOI-Mode */
287#else
288		tt_mfp.vec_adr  = 0x50;		/* Automatic EOI-Mode */
289#endif
290		tt_mfp.int_en_a = 0x00;		/* turn off MFP-Ints */
291		tt_mfp.int_en_b = 0x00;
292		tt_mfp.int_mk_a = 0xff;		/* no Masking */
293		tt_mfp.int_mk_b = 0xff;
294	}
295
296	if (ATARIHW_PRESENT(SCC) && !atari_SCC_reset_done) {
297		atari_scc.cha_a_ctrl = 9;
298		MFPDELAY();
299		atari_scc.cha_a_ctrl = (char) 0xc0; /* hardware reset */
300	}
301
302	if (ATARIHW_PRESENT(SCU)) {
303		/* init the SCU if present */
304		tt_scu.sys_mask = 0x10;		/* enable VBL (for the cursor) and
305									 * disable HSYNC interrupts (who
306									 * needs them?)  MFP and SCC are
307									 * enabled in VME mask
308									 */
309		tt_scu.vme_mask = 0x60;		/* enable MFP and SCC ints */
310	} else {
311		/* If no SCU and no Hades, the HSYNC interrupt needs to be
312		 * disabled this way. (Else _inthandler in kernel/sys_call.S
313		 * gets overruns)
314		 */
315
316		vectors[VEC_INT2] = falcon_hblhandler;
317		vectors[VEC_INT4] = falcon_hblhandler;
318	}
319
320	if (ATARIHW_PRESENT(PCM_8BIT) && ATARIHW_PRESENT(MICROWIRE)) {
321		/* Initialize the LM1992 Sound Controller to enable
322		   the PSG sound.  This is misplaced here, it should
323		   be in an atasound_init(), that doesn't exist yet. */
324		atari_microwire_cmd(MW_LM1992_PSG_HIGH);
325	}
326
327	stdma_init();
328
329	/* Initialize the PSG: all sounds off, both ports output */
330	sound_ym.rd_data_reg_sel = 7;
331	sound_ym.wd_data = 0xff;
332
333	m68k_setup_irq_controller(&atari_mfptimer_chip, handle_simple_irq,
334				  IRQ_MFP_TIMER1, 8);
335
336	irq_set_status_flags(IRQ_MFP_TIMER1, IRQ_IS_POLLED);
337	irq_set_status_flags(IRQ_MFP_TIMER2, IRQ_IS_POLLED);
338
339	/* prepare timer D data for use as poll interrupt */
340	/* set Timer D data Register - needs to be > 0 */
341	st_mfp.tim_dt_d = 254;	/* < 100 Hz */
342	/* start timer D, div = 1:100 */
343	st_mfp.tim_ct_cd = (st_mfp.tim_ct_cd & 0xf0) | 0x6;
344
345	/* request timer D dispatch handler */
346	if (request_irq(IRQ_MFP_TIMD, mfp_timer_d_handler, IRQF_SHARED,
347			stmfp_base.name, &stmfp_base))
348		pr_err("Couldn't register %s interrupt\n", stmfp_base.name);
349
350	/*
351	 * EtherNAT ethernet / USB interrupt handlers
352	 */
353
354	m68k_setup_irq_controller(&atari_ethernat_chip, handle_simple_irq,
355				  139, 2);
356}
357
358
359/*
360 * atari_register_vme_int() returns the number of a free interrupt vector for
361 * hardware with a programmable int vector (probably a VME board).
362 */
363
364unsigned int atari_register_vme_int(void)
365{
366	int i;
367
368	for (i = 0; i < 32; i++)
369		if ((free_vme_vec_bitmap & (1 << i)) == 0)
370			break;
371
372	if (i == 16)
373		return 0;
374
375	free_vme_vec_bitmap |= 1 << i;
376	return VME_SOURCE_BASE + i;
377}
378EXPORT_SYMBOL(atari_register_vme_int);
379
380
381void atari_unregister_vme_int(unsigned int irq)
382{
383	if (irq >= VME_SOURCE_BASE && irq < VME_SOURCE_BASE + VME_MAX_SOURCES) {
384		irq -= VME_SOURCE_BASE;
385		free_vme_vec_bitmap &= ~(1 << irq);
386	}
387}
388EXPORT_SYMBOL(atari_unregister_vme_int);
389
390
391