x86/xen: resume timer irqs early
[linux/fpc-iii.git] / arch / m68k / atari / ataints.c
blob20cde4e9fc772ed2aef86c0da2edc2facb9e1e38
1 /*
2 * arch/m68k/atari/ataints.c -- Atari Linux interrupt handling code
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 :-()
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.
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!
20 * 12/13/95: New interface functions atari_level_triggered_int() and
21 * atari_register_vme_int() as support for level triggered VME interrupts.
23 * 02/12/96: (Roman)
24 * Total rewrite of Atari interrupt handling, for new scheme see comments
25 * below.
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.
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.
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>
45 #include <asm/traps.h>
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 #include <asm/io.h>
56 * Atari interrupt handling scheme:
57 * --------------------------------
59 * All interrupt source have an internal number (defined in
60 * <asm/atariints.h>): Autovector interrupts are 1..7, then follow ST-MFP,
61 * TT-MFP, SCC, and finally VME interrupts. Vector numbers for the latter can
62 * be allocated by atari_register_vme_int().
66 * Bitmap for free interrupt vector numbers
67 * (new vectors starting from 0x70 can be allocated by
68 * atari_register_vme_int())
70 static int free_vme_vec_bitmap;
72 /* GK:
73 * HBL IRQ handler for Falcon. Nobody needs it :-)
74 * ++andreas: raise ipl to disable further HBLANK interrupts.
76 asmlinkage void falcon_hblhandler(void);
77 asm(".text\n"
78 __ALIGN_STR "\n\t"
79 "falcon_hblhandler:\n\t"
80 "orw #0x200,%sp@\n\t" /* set saved ipl to 2 */
81 "rte");
83 extern void atari_microwire_cmd(int cmd);
85 static unsigned int atari_irq_startup(struct irq_data *data)
87 unsigned int irq = data->irq;
89 m68k_irq_startup(data);
90 atari_turnon_irq(irq);
91 atari_enable_irq(irq);
92 return 0;
95 static void atari_irq_shutdown(struct irq_data *data)
97 unsigned int irq = data->irq;
99 atari_disable_irq(irq);
100 atari_turnoff_irq(irq);
101 m68k_irq_shutdown(data);
103 if (irq == IRQ_AUTO_4)
104 vectors[VEC_INT4] = falcon_hblhandler;
107 static void atari_irq_enable(struct irq_data *data)
109 atari_enable_irq(data->irq);
112 static void atari_irq_disable(struct irq_data *data)
114 atari_disable_irq(data->irq);
117 static 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,
126 * ST-MFP timer D chained interrupts - each driver gets its own timer
127 * interrupt instance.
130 struct 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"
144 static irqreturn_t mfptimer_handler(int irq, void *dev_id)
146 struct mfptimerbase *base = dev_id;
147 int mach_irq;
148 unsigned char ints;
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);
156 return IRQ_HANDLED;
160 static void atari_mfptimer_enable(struct irq_data *data)
162 int mfp_num = data->irq - IRQ_MFP_TIMER1;
163 stmfp_base.int_mask |= 1 << mfp_num;
164 atari_enable_irq(IRQ_MFP_TIMD);
167 static void atari_mfptimer_disable(struct irq_data *data)
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);
175 static struct irq_chip atari_mfptimer_chip = {
176 .name = "timer_d",
177 .irq_enable = atari_mfptimer_enable,
178 .irq_disable = atari_mfptimer_disable,
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!
191 static unsigned char *enat_cpld;
193 static unsigned int atari_ethernat_startup(struct irq_data *data)
195 int enat_num = 140 - data->irq + 1;
197 m68k_irq_startup(data);
199 * map CPLD interrupt register
201 if (!enat_cpld)
202 enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2);
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
209 if (enat_num == 1)
210 *enat_cpld |= 1 << enat_num;
212 return 0;
215 static void atari_ethernat_enable(struct irq_data *data)
217 int enat_num = 140 - data->irq + 1;
219 * map CPLD interrupt register
221 if (!enat_cpld)
222 enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2);
223 *enat_cpld |= 1 << enat_num;
226 static void atari_ethernat_disable(struct irq_data *data)
228 int enat_num = 140 - data->irq + 1;
230 * map CPLD interrupt register
232 if (!enat_cpld)
233 enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2);
234 *enat_cpld &= ~(1 << enat_num);
237 static void atari_ethernat_shutdown(struct irq_data *data)
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;
247 static 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,
256 * void atari_init_IRQ (void)
258 * Parameters: None
260 * Returns: Nothing
262 * This function should be called during kernel startup to initialize
263 * the atari IRQ handling routines.
266 void __init atari_init_IRQ(void)
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);
272 /* Initialize the MFP(s) */
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;
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;
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 */
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
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)
316 vectors[VEC_INT2] = falcon_hblhandler;
317 vectors[VEC_INT4] = falcon_hblhandler;
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);
327 stdma_init();
329 /* Initialize the PSG: all sounds off, both ports output */
330 sound_ym.rd_data_reg_sel = 7;
331 sound_ym.wd_data = 0xff;
333 m68k_setup_irq_controller(&atari_mfptimer_chip, handle_simple_irq,
334 IRQ_MFP_TIMER1, 8);
336 /* prepare timer D data for use as poll interrupt */
337 /* set Timer D data Register - needs to be > 0 */
338 st_mfp.tim_dt_d = 254; /* < 100 Hz */
339 /* start timer D, div = 1:100 */
340 st_mfp.tim_ct_cd = (st_mfp.tim_ct_cd & 0xf0) | 0x6;
342 /* request timer D dispatch handler */
343 if (request_irq(IRQ_MFP_TIMD, mfptimer_handler, IRQF_SHARED,
344 stmfp_base.name, &stmfp_base))
345 pr_err("Couldn't register %s interrupt\n", stmfp_base.name);
348 * EtherNAT ethernet / USB interrupt handlers
351 m68k_setup_irq_controller(&atari_ethernat_chip, handle_simple_irq,
352 139, 2);
357 * atari_register_vme_int() returns the number of a free interrupt vector for
358 * hardware with a programmable int vector (probably a VME board).
361 unsigned int atari_register_vme_int(void)
363 int i;
365 for (i = 0; i < 32; i++)
366 if ((free_vme_vec_bitmap & (1 << i)) == 0)
367 break;
369 if (i == 16)
370 return 0;
372 free_vme_vec_bitmap |= 1 << i;
373 return VME_SOURCE_BASE + i;
375 EXPORT_SYMBOL(atari_register_vme_int);
378 void atari_unregister_vme_int(unsigned int irq)
380 if (irq >= VME_SOURCE_BASE && irq < VME_SOURCE_BASE + VME_MAX_SOURCES) {
381 irq -= VME_SOURCE_BASE;
382 free_vme_vec_bitmap &= ~(1 << irq);
385 EXPORT_SYMBOL(atari_unregister_vme_int);