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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
45#include <asm/traps.h>
46
47#include <asm/atarihw.h>
48#include <asm/atariints.h>
49#include <asm/atari_stdma.h>
50#include <asm/irq.h>
51#include <asm/entry.h>
52
53
54/*
55 * Atari interrupt handling scheme:
56 * --------------------------------
57 *
58 * All interrupt source have an internal number (defined in
59 * <asm/atariints.h>): Autovector interrupts are 1..7, then follow ST-MFP,
60 * TT-MFP, SCC, and finally VME interrupts. Vector numbers for the latter can
61 * be allocated by atari_register_vme_int().
62 */
63
64/*
65 * Bitmap for free interrupt vector numbers
66 * (new vectors starting from 0x70 can be allocated by
67 * atari_register_vme_int())
68 */
69static int free_vme_vec_bitmap;
70
71/* GK:
72 * HBL IRQ handler for Falcon. Nobody needs it :-)
73 * ++andreas: raise ipl to disable further HBLANK interrupts.
74 */
75asmlinkage void falcon_hblhandler(void);
76asm(".text\n"
77__ALIGN_STR "\n\t"
78"falcon_hblhandler:\n\t"
79 "orw #0x200,%sp@\n\t" /* set saved ipl to 2 */
80 "rte");
81
82extern void atari_microwire_cmd(int cmd);
83
84static unsigned int atari_irq_startup(struct irq_data *data)
85{
86 unsigned int irq = data->irq;
87
88 m68k_irq_startup(data);
89 atari_turnon_irq(irq);
90 atari_enable_irq(irq);
91 return 0;
92}
93
94static void atari_irq_shutdown(struct irq_data *data)
95{
96 unsigned int irq = data->irq;
97
98 atari_disable_irq(irq);
99 atari_turnoff_irq(irq);
100 m68k_irq_shutdown(data);
101
102 if (irq == IRQ_AUTO_4)
103 vectors[VEC_INT4] = falcon_hblhandler;
104}
105
106static void atari_irq_enable(struct irq_data *data)
107{
108 atari_enable_irq(data->irq);
109}
110
111static void atari_irq_disable(struct irq_data *data)
112{
113 atari_disable_irq(data->irq);
114}
115
116static struct irq_chip atari_irq_chip = {
117 .name = "atari",
118 .irq_startup = atari_irq_startup,
119 .irq_shutdown = atari_irq_shutdown,
120 .irq_enable = atari_irq_enable,
121 .irq_disable = atari_irq_disable,
122};
123
124/*
125 * void atari_init_IRQ (void)
126 *
127 * Parameters: None
128 *
129 * Returns: Nothing
130 *
131 * This function should be called during kernel startup to initialize
132 * the atari IRQ handling routines.
133 */
134
135void __init atari_init_IRQ(void)
136{
137 m68k_setup_user_interrupt(VEC_USER, NUM_ATARI_SOURCES - IRQ_USER);
138 m68k_setup_irq_controller(&atari_irq_chip, handle_simple_irq, 1,
139 NUM_ATARI_SOURCES - 1);
140
141 /* Initialize the MFP(s) */
142
143#ifdef ATARI_USE_SOFTWARE_EOI
144 st_mfp.vec_adr = 0x48; /* Software EOI-Mode */
145#else
146 st_mfp.vec_adr = 0x40; /* Automatic EOI-Mode */
147#endif
148 st_mfp.int_en_a = 0x00; /* turn off MFP-Ints */
149 st_mfp.int_en_b = 0x00;
150 st_mfp.int_mk_a = 0xff; /* no Masking */
151 st_mfp.int_mk_b = 0xff;
152
153 if (ATARIHW_PRESENT(TT_MFP)) {
154#ifdef ATARI_USE_SOFTWARE_EOI
155 tt_mfp.vec_adr = 0x58; /* Software EOI-Mode */
156#else
157 tt_mfp.vec_adr = 0x50; /* Automatic EOI-Mode */
158#endif
159 tt_mfp.int_en_a = 0x00; /* turn off MFP-Ints */
160 tt_mfp.int_en_b = 0x00;
161 tt_mfp.int_mk_a = 0xff; /* no Masking */
162 tt_mfp.int_mk_b = 0xff;
163 }
164
165 if (ATARIHW_PRESENT(SCC) && !atari_SCC_reset_done) {
166 atari_scc.cha_a_ctrl = 9;
167 MFPDELAY();
168 atari_scc.cha_a_ctrl = (char) 0xc0; /* hardware reset */
169 }
170
171 if (ATARIHW_PRESENT(SCU)) {
172 /* init the SCU if present */
173 tt_scu.sys_mask = 0x10; /* enable VBL (for the cursor) and
174 * disable HSYNC interrupts (who
175 * needs them?) MFP and SCC are
176 * enabled in VME mask
177 */
178 tt_scu.vme_mask = 0x60; /* enable MFP and SCC ints */
179 } else {
180 /* If no SCU and no Hades, the HSYNC interrupt needs to be
181 * disabled this way. (Else _inthandler in kernel/sys_call.S
182 * gets overruns)
183 */
184
185 vectors[VEC_INT2] = falcon_hblhandler;
186 vectors[VEC_INT4] = falcon_hblhandler;
187 }
188
189 if (ATARIHW_PRESENT(PCM_8BIT) && ATARIHW_PRESENT(MICROWIRE)) {
190 /* Initialize the LM1992 Sound Controller to enable
191 the PSG sound. This is misplaced here, it should
192 be in an atasound_init(), that doesn't exist yet. */
193 atari_microwire_cmd(MW_LM1992_PSG_HIGH);
194 }
195
196 stdma_init();
197
198 /* Initialize the PSG: all sounds off, both ports output */
199 sound_ym.rd_data_reg_sel = 7;
200 sound_ym.wd_data = 0xff;
201}
202
203
204/*
205 * atari_register_vme_int() returns the number of a free interrupt vector for
206 * hardware with a programmable int vector (probably a VME board).
207 */
208
209unsigned int atari_register_vme_int(void)
210{
211 int i;
212
213 for (i = 0; i < 32; i++)
214 if ((free_vme_vec_bitmap & (1 << i)) == 0)
215 break;
216
217 if (i == 16)
218 return 0;
219
220 free_vme_vec_bitmap |= 1 << i;
221 return VME_SOURCE_BASE + i;
222}
223EXPORT_SYMBOL(atari_register_vme_int);
224
225
226void atari_unregister_vme_int(unsigned int irq)
227{
228 if (irq >= VME_SOURCE_BASE && irq < VME_SOURCE_BASE + VME_MAX_SOURCES) {
229 irq -= VME_SOURCE_BASE;
230 free_vme_vec_bitmap &= ~(1 << irq);
231 }
232}
233EXPORT_SYMBOL(atari_unregister_vme_int);
234
235
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