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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [mips/] [kernel/] [irq.c] - Blame information for rev 1624

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/*
 *      linux/arch/mips/kernel/irq.c
 *
 *      Copyright (C) 1992 Linus Torvalds
 *
 * This file contains the code used by various IRQ handling routines:
 * asking for different IRQ's should be done through these routines
 * instead of just grabbing them. Thus setups with different IRQ numbers
 * shouldn't result in any weird surprises, and installing new handlers
 * should be easier.
 */
 
/*
 * IRQ's are in fact implemented a bit like signal handlers for the kernel.
 * Naturally it's not a 1:1 relation, but there are similarities.
 */
 
/*
 * Mips support by Ralf Baechle and Andreas Busse
 *
 * The Deskstation Tyne is almost completely like an IBM compatible PC with
 * another type of microprocessor. Therefore this code is almost completely
 * the same. More work needs to be done to support Acer PICA and other
 * machines.
 */
 
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/kernel_stat.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/timex.h>
#include <linux/malloc.h>
#include <linux/random.h>
 
#include <asm/bitops.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/jazz.h>
#include <asm/mipsregs.h>
#include <asm/system.h>
 
#define TIMER_IRQ 0                     /* Keep this in sync with time.c */
 
unsigned char cache_21 = 0xff;
unsigned char cache_A1 = 0xff;
 
unsigned long spurious_count = 0;
 
void disable_irq(unsigned int irq_nr)
{
        unsigned long flags;
        unsigned char mask;
 
        mask = 1 << (irq_nr & 7);
        save_flags(flags);
        if (irq_nr < 8) {
                cli();
                cache_21 |= mask;
                outb(cache_21,0x21);
                restore_flags(flags);
                return;
        }
        cli();
        cache_A1 |= mask;
        outb(cache_A1,0xA1);
        restore_flags(flags);
}
 
void enable_irq(unsigned int irq_nr)
{
        unsigned long flags;
        unsigned char mask;
 
        mask = ~(1 << (irq_nr & 7));
        save_flags(flags);
        if (irq_nr < 8) {
                cli();
                cache_21 &= mask;
                outb(cache_21,0x21);
                restore_flags(flags);
                return;
        }
        cli();
        cache_A1 &= mask;
        outb(cache_A1,0xA1);
        restore_flags(flags);
}
 
/*
 * Pointers to the low-level handlers: first the general ones, then the
 * fast ones, then the bad ones.
 */
extern void interrupt(void);
extern void fast_interrupt(void);
extern void bad_interrupt(void);
 
/*
 * Initial irq handlers.
 */
static struct irqaction timer_irq = { NULL, 0, 0, NULL, NULL, NULL};
static struct irqaction cascade_irq = { NULL, 0, 0, NULL, NULL, NULL};
static struct irqaction math_irq = { NULL, 0, 0, NULL, NULL, NULL};
 
static struct irqaction *irq_action[16] = {
          NULL, NULL, NULL, NULL, NULL, NULL , NULL, NULL,
          NULL, NULL, NULL, NULL, NULL, NULL , NULL, NULL
};
 
int get_irq_list(char *buf)
{
        int i, len = 0;
        struct irqaction * action;
 
        for (i = 0 ; i < 16 ; i++) {
                action = *(i + irq_action);
                if (!action)
                        continue;
                len += sprintf(buf+len, "%2d: %8d %c %s",
                        i, kstat.interrupts[i],
                        (action->flags & SA_INTERRUPT) ? '+' : ' ',
                        action->name);
                for (action=action->next; action; action = action->next) {
                        len += sprintf(buf+len, ",%s %s",
                                (action->flags & SA_INTERRUPT) ? " +" : "",
                                action->name);
                }
                len += sprintf(buf+len, "\n");
        }
        return len;
}
 
/*
 * do_IRQ handles IRQ's that have been installed without the
 * SA_INTERRUPT flag: it uses the full signal-handling return
 * and runs with other interrupts enabled. All relatively slow
 * IRQ's should use this format: notably the keyboard/timer
 * routines.
 */
asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
{
        struct irqaction * action = *(irq + irq_action);
 
        kstat.interrupts[irq]++;
        if (action->flags & SA_SAMPLE_RANDOM)
                add_interrupt_randomness(irq);
        while (action) {
            action->handler(irq, action->dev_id, regs);
            action = action->next;
        }
}
 
/*
 * do_fast_IRQ handles IRQ's that don't need the fancy interrupt return
 * stuff - the handler is also running with interrupts disabled unless
 * it explicitly enables them later.
 */
asmlinkage void do_fast_IRQ(int irq)
{
        struct irqaction * action = *(irq + irq_action);
 
        kstat.interrupts[irq]++;
        if (action->flags & SA_SAMPLE_RANDOM)
                add_interrupt_randomness(irq);
        while (action) {
            action->handler(irq, action->dev_id, NULL);
            action = action->next;
        }
}
 
#define SA_PROBE SA_ONESHOT
 
int request_irq(unsigned int irq,
                void (*handler)(int, void *, struct pt_regs *),
                unsigned long irqflags,
                const char * devname,
                void *dev_id)
{
        struct irqaction * action, *tmp = NULL;
        unsigned long flags;
 
        if (irq > 15)
                return -EINVAL;
        if (!handler)
            return -EINVAL;
        action = *(irq + irq_action);
        if (action) {
            if ((action->flags & SA_SHIRQ) && (irqflags & SA_SHIRQ)) {
                for (tmp = action; tmp->next; tmp = tmp->next);
            } else {
                return -EBUSY;
            }
            if ((action->flags & SA_INTERRUPT) ^ (irqflags & SA_INTERRUPT)) {
              printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
              return -EBUSY;
            }
        }
        if (irqflags & SA_SAMPLE_RANDOM)
                rand_initialize_irq(irq);
        save_flags(flags);
        cli();
        if (irq == 2)
            action = &cascade_irq;
        else if (irq == 13)
          action = &math_irq;
        else if (irq == TIMER_IRQ)
          action = &timer_irq;
        else
          action = (struct irqaction *)kmalloc(sizeof(struct irqaction), GFP_KERNEL);
 
        if (!action) {
            restore_flags(flags);
            return -ENOMEM;
        }
 
        action->handler = handler;
        action->flags = irqflags;
        action->mask = 0;
        action->name = devname;
        action->next = NULL;
        action->dev_id = dev_id;
 
        if (tmp) {
            tmp->next = action;
        } else {
            *(irq + irq_action) = action;
            if (!(action->flags & SA_PROBE)) {/* SA_ONESHOT used by probing */
                /*
                 * FIXME: Does the SA_INTERRUPT flag make any sense on MIPS???
                 */
                if (action->flags & SA_INTERRUPT)
                        set_int_vector(irq,fast_interrupt);
                else
                        set_int_vector(irq,interrupt);
            }
            if (irq < 8) {
                cache_21 &= ~(1<<irq);
                outb(cache_21,0x21);
            } else {
                cache_21 &= ~(1<<2);
                cache_A1 &= ~(1<<(irq-8));
                outb(cache_21,0x21);
                outb(cache_A1,0xA1);
            }
        }
        restore_flags(flags);
        return 0;
}
 
void free_irq(unsigned int irq, void *dev_id)
{
        struct irqaction * action = *(irq + irq_action);
        struct irqaction * tmp = NULL;
        unsigned long flags;
 
        if (irq > 15) {
                printk("Trying to free IRQ%d\n",irq);
                return;
        }
        if (!action->handler) {
                printk("Trying to free free IRQ%d\n",irq);
                return;
        }
        if (dev_id) {
            for (; action; action = action->next) {
                if (action->dev_id == dev_id) break;
                tmp = action;
            }
            if (!action) {
                printk("Trying to free free shared IRQ%d\n",irq);
                return;
            }
        } else if (action->flags & SA_SHIRQ) {
            printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
            return;
        }
        save_flags(flags);
        cli();
        if (action && tmp) {
            tmp->next = action->next;
        } else {
            *(irq + irq_action) = action->next;
        }
 
        if ((irq == 2) || (irq == 13) | (irq == TIMER_IRQ))
          memset(action, 0, sizeof(struct irqaction));
        else
          kfree_s(action, sizeof(struct irqaction));
 
        if (!(*(irq + irq_action))) {
            if (irq < 8) {
                cache_21 |= 1 << irq;
                outb(cache_21,0x21);
            } else {
                cache_A1 |= 1 << (irq-8);
                outb(cache_A1,0xA1);
            }
            set_int_vector(irq,bad_interrupt);
        }
        restore_flags(flags);
}
 
static void no_action(int cpl, void *dev_id, struct pt_regs * regs) { }
 
unsigned long probe_irq_on (void)
{
        unsigned int i, irqs = 0, irqmask;
        unsigned long delay;
 
        /* first, snaffle up any unassigned irqs */
        for (i = 15; i > 0; i--) {
                if (!request_irq(i, no_action, SA_PROBE, "probe", NULL)) {
                        enable_irq(i);
                        irqs |= (1 << i);
                }
        }
 
        /* wait for spurious interrupts to mask themselves out again */
        for (delay = jiffies + 2; delay > jiffies; );   /* min 10ms delay */
 
        /* now filter out any obviously spurious interrupts */
        irqmask = (((unsigned int)cache_A1)<<8) | (unsigned int)cache_21;
        for (i = 15; i > 0; i--) {
                if (irqs & (1 << i) & irqmask) {
                        irqs ^= (1 << i);
                        free_irq(i, NULL);
                }
        }
#ifdef DEBUG
        printk("probe_irq_on:  irqs=0x%04x irqmask=0x%04x\n", irqs, irqmask);
#endif
        return irqs;
}
 
int probe_irq_off (unsigned long irqs)
{
        unsigned int i, irqmask;
 
        irqmask = (((unsigned int)cache_A1)<<8) | (unsigned int)cache_21;
        for (i = 15; i > 0; i--) {
                if (irqs & (1 << i)) {
                        free_irq(i, NULL);
                }
        }
#ifdef DEBUG
        printk("probe_irq_off: irqs=0x%04x irqmask=0x%04x\n", irqs, irqmask);
#endif
        irqs &= irqmask;
        if (!irqs)
                return 0;
        i = ffz(~irqs);
        if (irqs != (irqs & (1 << i)))
                i = -i;
        return i;
}
 
void init_IRQ(void)
{
        int i;
 
        switch (boot_info.machtype) {
                case MACH_MIPS_MAGNUM_4000:
                case MACH_ACER_PICA_61:
                        r4030_write_reg16(JAZZ_IO_IRQ_ENABLE,
                                          JAZZ_IE_ETHERNET |
                                          JAZZ_IE_SERIAL1  |
                                          JAZZ_IE_SERIAL2  |
                                          JAZZ_IE_PARALLEL |
                                          JAZZ_IE_FLOPPY);
                        r4030_read_reg16(JAZZ_IO_IRQ_SOURCE); /* clear pending IRQs */
                        set_cp0_status(ST0_IM, IE_IRQ4 | IE_IRQ1);
                        /* set the clock to 100 Hz */
                        r4030_write_reg32(JAZZ_TIMER_INTERVAL, 9);
                        break;
                case MACH_DESKSTATION_TYNE:
                        /* set the clock to 100 Hz */
                        outb_p(0x34,0x43);              /* binary, mode 2, LSB/MSB, ch 0 */
                        outb_p(LATCH & 0xff , 0x40);    /* LSB */
                        outb(LATCH >> 8 , 0x40);        /* MSB */
 
                        if (request_irq(2, no_action, SA_INTERRUPT, "cascade", NULL))
                                printk("Unable to get IRQ2 for cascade\n");
                        break;
                default:
                        panic("Unknown machtype in init_IRQ");
        }
 
        for (i = 0; i < 16 ; i++)
                set_int_vector(i, bad_interrupt);
 
        /* initialize the bottom half routines. */
        for (i = 0; i < 32; i++) {
                bh_base[i].routine = NULL;
                bh_base[i].data = NULL;
        }
        bh_active = 0;
        intr_count = 0;
}

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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [mips/] [kernel/] [irq.c] - Blame information for rev 1624

Line No.	Rev	Author	Line
1	1624	jcastillo	`/*`
2			`* linux/arch/mips/kernel/irq.c`
3			`*`
4			`* Copyright (C) 1992 Linus Torvalds`
5			`*`
6			`* This file contains the code used by various IRQ handling routines:`
7			`* asking for different IRQ's should be done through these routines`
8			`* instead of just grabbing them. Thus setups with different IRQ numbers`
9			`* shouldn't result in any weird surprises, and installing new handlers`
10			`* should be easier.`
11			`*/`
12
13			`/*`
14			`* IRQ's are in fact implemented a bit like signal handlers for the kernel.`
15			`* Naturally it's not a 1:1 relation, but there are similarities.`
16			`*/`
17
18			`/*`
19			`* Mips support by Ralf Baechle and Andreas Busse`
20			`*`
21			`* The Deskstation Tyne is almost completely like an IBM compatible PC with`
22			`* another type of microprocessor. Therefore this code is almost completely`
23			`* the same. More work needs to be done to support Acer PICA and other`
24			`* machines.`
25			`*/`
26
27			`#include <linux/ptrace.h>`
28			`#include <linux/errno.h>`
29			`#include <linux/kernel_stat.h>`
30			`#include <linux/signal.h>`
31			`#include <linux/sched.h>`
32			`#include <linux/types.h>`
33			`#include <linux/interrupt.h>`
34			`#include <linux/timex.h>`
35			`#include <linux/malloc.h>`
36			`#include <linux/random.h>`
37
38			`#include <asm/bitops.h>`
39			`#include <asm/bootinfo.h>`
40			`#include <asm/io.h>`
41			`#include <asm/irq.h>`
42			`#include <asm/jazz.h>`
43			`#include <asm/mipsregs.h>`
44			`#include <asm/system.h>`
45
46			`#define TIMER_IRQ 0 /* Keep this in sync with time.c */`
47
48			`unsigned char cache_21 = 0xff;`
49			`unsigned char cache_A1 = 0xff;`
50
51			`unsigned long spurious_count = 0;`
52
53			`void disable_irq(unsigned int irq_nr)`
54			`{`
55			`unsigned long flags;`
56			`unsigned char mask;`
57
58			`mask = 1 << (irq_nr & 7);`
59			`save_flags(flags);`
60			`if (irq_nr < 8) {`
61			`cli();`
62			`cache_21 \|= mask;`
63			`outb(cache_21,0x21);`
64			`restore_flags(flags);`
65			`return;`
66			`}`
67			`cli();`
68			`cache_A1 \|= mask;`
69			`outb(cache_A1,0xA1);`
70			`restore_flags(flags);`
71			`}`
72
73			`void enable_irq(unsigned int irq_nr)`
74			`{`
75			`unsigned long flags;`
76			`unsigned char mask;`
77
78			`mask = ~(1 << (irq_nr & 7));`
79			`save_flags(flags);`
80			`if (irq_nr < 8) {`
81			`cli();`
82			`cache_21 &= mask;`
83			`outb(cache_21,0x21);`
84			`restore_flags(flags);`
85			`return;`
86			`}`
87			`cli();`
88			`cache_A1 &= mask;`
89			`outb(cache_A1,0xA1);`
90			`restore_flags(flags);`
91			`}`
92
93			`/*`
94			`* Pointers to the low-level handlers: first the general ones, then the`
95			`* fast ones, then the bad ones.`
96			`*/`
97			`extern void interrupt(void);`
98			`extern void fast_interrupt(void);`
99			`extern void bad_interrupt(void);`
100
101			`/*`
102			`* Initial irq handlers.`
103			`*/`
104			`static struct irqaction timer_irq = { NULL, 0, 0, NULL, NULL, NULL};`
105			`static struct irqaction cascade_irq = { NULL, 0, 0, NULL, NULL, NULL};`
106			`static struct irqaction math_irq = { NULL, 0, 0, NULL, NULL, NULL};`
107
108			`static struct irqaction *irq_action[16] = {`
109			`NULL, NULL, NULL, NULL, NULL, NULL , NULL, NULL,`
110			`NULL, NULL, NULL, NULL, NULL, NULL , NULL, NULL`
111			`};`
112
113			`int get_irq_list(char *buf)`
114			`{`
115			`int i, len = 0;`
116			`struct irqaction * action;`
117
118			`for (i = 0 ; i < 16 ; i++) {`
119			`action = *(i + irq_action);`
120			`if (!action)`
121			`continue;`
122			`len += sprintf(buf+len, "%2d: %8d %c %s",`
123			`i, kstat.interrupts[i],`
124			`(action->flags & SA_INTERRUPT) ? '+' : ' ',`
125			`action->name);`
126			`for (action=action->next; action; action = action->next) {`
127			`len += sprintf(buf+len, ",%s %s",`
128			`(action->flags & SA_INTERRUPT) ? " +" : "",`
129			`action->name);`
130			`}`
131			`len += sprintf(buf+len, "\n");`
132			`}`
133			`return len;`
134			`}`
135
136			`/*`
137			`* do_IRQ handles IRQ's that have been installed without the`
138			`* SA_INTERRUPT flag: it uses the full signal-handling return`
139			`* and runs with other interrupts enabled. All relatively slow`
140			`* IRQ's should use this format: notably the keyboard/timer`
141			`* routines.`
142			`*/`
143			`asmlinkage void do_IRQ(int irq, struct pt_regs * regs)`
144			`{`
145			`struct irqaction * action = *(irq + irq_action);`
146
147			`kstat.interrupts[irq]++;`
148			`if (action->flags & SA_SAMPLE_RANDOM)`
149			`add_interrupt_randomness(irq);`
150			`while (action) {`
151			`action->handler(irq, action->dev_id, regs);`
152			`action = action->next;`
153			`}`
154			`}`
155
156			`/*`
157			`* do_fast_IRQ handles IRQ's that don't need the fancy interrupt return`
158			`* stuff - the handler is also running with interrupts disabled unless`
159			`* it explicitly enables them later.`
160			`*/`
161			`asmlinkage void do_fast_IRQ(int irq)`
162			`{`
163			`struct irqaction * action = *(irq + irq_action);`
164
165			`kstat.interrupts[irq]++;`
166			`if (action->flags & SA_SAMPLE_RANDOM)`
167			`add_interrupt_randomness(irq);`
168			`while (action) {`
169			`action->handler(irq, action->dev_id, NULL);`
170			`action = action->next;`
171			`}`
172			`}`
173
174			`#define SA_PROBE SA_ONESHOT`
175
176			`int request_irq(unsigned int irq,`
177			`void (handler)(int, void , struct pt_regs *),`
178			`unsigned long irqflags,`
179			`const char * devname,`
180			`void *dev_id)`
181			`{`
182			`struct irqaction * action, *tmp = NULL;`
183			`unsigned long flags;`
184
185			`if (irq > 15)`
186			`return -EINVAL;`
187			`if (!handler)`
188			`return -EINVAL;`
189			`action = *(irq + irq_action);`
190			`if (action) {`
191			`if ((action->flags & SA_SHIRQ) && (irqflags & SA_SHIRQ)) {`
192			`for (tmp = action; tmp->next; tmp = tmp->next);`
193			`} else {`
194			`return -EBUSY;`
195			`}`
196			`if ((action->flags & SA_INTERRUPT) ^ (irqflags & SA_INTERRUPT)) {`
197			`printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);`
198			`return -EBUSY;`
199			`}`
200			`}`
201			`if (irqflags & SA_SAMPLE_RANDOM)`
202			`rand_initialize_irq(irq);`
203			`save_flags(flags);`
204			`cli();`
205			`if (irq == 2)`
206			`action = &cascade_irq;`
207			`else if (irq == 13)`
208			`action = &math_irq;`
209			`else if (irq == TIMER_IRQ)`
210			`action = &timer_irq;`
211			`else`
212			`action = (struct irqaction *)kmalloc(sizeof(struct irqaction), GFP_KERNEL);`
213
214			`if (!action) {`
215			`restore_flags(flags);`
216			`return -ENOMEM;`
217			`}`
218
219			`action->handler = handler;`
220			`action->flags = irqflags;`
221			`action->mask = 0;`
222			`action->name = devname;`
223			`action->next = NULL;`
224			`action->dev_id = dev_id;`
225
226			`if (tmp) {`
227			`tmp->next = action;`
228			`} else {`
229			`*(irq + irq_action) = action;`
230			`if (!(action->flags & SA_PROBE)) {/* SA_ONESHOT used by probing */`
231			`/*`
232			`* FIXME: Does the SA_INTERRUPT flag make any sense on MIPS???`
233			`*/`
234			`if (action->flags & SA_INTERRUPT)`
235			`set_int_vector(irq,fast_interrupt);`
236			`else`
237			`set_int_vector(irq,interrupt);`
238			`}`
239			`if (irq < 8) {`
240			`cache_21 &= ~(1<<irq);`
241			`outb(cache_21,0x21);`
242			`} else {`
243			`cache_21 &= ~(1<<2);`
244			`cache_A1 &= ~(1<<(irq-8));`
245			`outb(cache_21,0x21);`
246			`outb(cache_A1,0xA1);`
247			`}`
248			`}`
249			`restore_flags(flags);`
250			`return 0;`
251			`}`
252
253			`void free_irq(unsigned int irq, void *dev_id)`
254			`{`
255			`struct irqaction * action = *(irq + irq_action);`
256			`struct irqaction * tmp = NULL;`
257			`unsigned long flags;`
258
259			`if (irq > 15) {`
260			`printk("Trying to free IRQ%d\n",irq);`
261			`return;`
262			`}`
263			`if (!action->handler) {`
264			`printk("Trying to free free IRQ%d\n",irq);`
265			`return;`
266			`}`
267			`if (dev_id) {`
268			`for (; action; action = action->next) {`
269			`if (action->dev_id == dev_id) break;`
270			`tmp = action;`
271			`}`
272			`if (!action) {`
273			`printk("Trying to free free shared IRQ%d\n",irq);`
274			`return;`
275			`}`
276			`} else if (action->flags & SA_SHIRQ) {`
277			`printk("Trying to free shared IRQ%d with NULL device ID\n", irq);`
278			`return;`
279			`}`
280			`save_flags(flags);`
281			`cli();`
282			`if (action && tmp) {`
283			`tmp->next = action->next;`
284			`} else {`
285			`*(irq + irq_action) = action->next;`
286			`}`
287
288			`if ((irq == 2) \|\| (irq == 13) \| (irq == TIMER_IRQ))`
289			`memset(action, 0, sizeof(struct irqaction));`
290			`else`
291			`kfree_s(action, sizeof(struct irqaction));`
292
293			`if (!(*(irq + irq_action))) {`
294			`if (irq < 8) {`
295			`cache_21 \|= 1 << irq;`
296			`outb(cache_21,0x21);`
297			`} else {`
298			`cache_A1 \|= 1 << (irq-8);`
299			`outb(cache_A1,0xA1);`
300			`}`
301			`set_int_vector(irq,bad_interrupt);`
302			`}`
303			`restore_flags(flags);`
304			`}`
305
306			`static void no_action(int cpl, void dev_id, struct pt_regs regs) { }`
307
308			`unsigned long probe_irq_on (void)`
309			`{`
310			`unsigned int i, irqs = 0, irqmask;`
311			`unsigned long delay;`
312
313			`/* first, snaffle up any unassigned irqs */`
314			`for (i = 15; i > 0; i--) {`
315			`if (!request_irq(i, no_action, SA_PROBE, "probe", NULL)) {`
316			`enable_irq(i);`
317			`irqs \|= (1 << i);`
318			`}`
319			`}`
320
321			`/* wait for spurious interrupts to mask themselves out again */`
322			`for (delay = jiffies + 2; delay > jiffies; ); /* min 10ms delay */`
323
324			`/* now filter out any obviously spurious interrupts */`
325			`irqmask = (((unsigned int)cache_A1)<<8) \| (unsigned int)cache_21;`
326			`for (i = 15; i > 0; i--) {`
327			`if (irqs & (1 << i) & irqmask) {`
328			`irqs ^= (1 << i);`
329			`free_irq(i, NULL);`
330			`}`
331			`}`
332			`#ifdef DEBUG`
333			`printk("probe_irq_on: irqs=0x%04x irqmask=0x%04x\n", irqs, irqmask);`
334			`#endif`
335			`return irqs;`
336			`}`
337
338			`int probe_irq_off (unsigned long irqs)`
339			`{`
340			`unsigned int i, irqmask;`
341
342			`irqmask = (((unsigned int)cache_A1)<<8) \| (unsigned int)cache_21;`
343			`for (i = 15; i > 0; i--) {`
344			`if (irqs & (1 << i)) {`
345			`free_irq(i, NULL);`
346			`}`
347			`}`
348			`#ifdef DEBUG`
349			`printk("probe_irq_off: irqs=0x%04x irqmask=0x%04x\n", irqs, irqmask);`
350			`#endif`
351			`irqs &= irqmask;`
352			`if (!irqs)`
353			`return 0;`
354			`i = ffz(~irqs);`
355			`if (irqs != (irqs & (1 << i)))`
356			`i = -i;`
357			`return i;`
358			`}`
359
360			`void init_IRQ(void)`
361			`{`
362			`int i;`
363
364			`switch (boot_info.machtype) {`
365			`case MACH_MIPS_MAGNUM_4000:`
366			`case MACH_ACER_PICA_61:`
367			`r4030_write_reg16(JAZZ_IO_IRQ_ENABLE,`
368			`JAZZ_IE_ETHERNET \|`
369			`JAZZ_IE_SERIAL1 \|`
370			`JAZZ_IE_SERIAL2 \|`
371			`JAZZ_IE_PARALLEL \|`
372			`JAZZ_IE_FLOPPY);`
373			`r4030_read_reg16(JAZZ_IO_IRQ_SOURCE); /* clear pending IRQs */`
374			`set_cp0_status(ST0_IM, IE_IRQ4 \| IE_IRQ1);`
375			`/* set the clock to 100 Hz */`
376			`r4030_write_reg32(JAZZ_TIMER_INTERVAL, 9);`
377			`break;`
378			`case MACH_DESKSTATION_TYNE:`
379			`/* set the clock to 100 Hz */`
380			`outb_p(0x34,0x43); /* binary, mode 2, LSB/MSB, ch 0 */`
381			`outb_p(LATCH & 0xff , 0x40); /* LSB */`
382			`outb(LATCH >> 8 , 0x40); /* MSB */`
383
384			`if (request_irq(2, no_action, SA_INTERRUPT, "cascade", NULL))`
385			`printk("Unable to get IRQ2 for cascade\n");`
386			`break;`
387			`default:`
388			`panic("Unknown machtype in init_IRQ");`
389			`}`
390
391			`for (i = 0; i < 16 ; i++)`
392			`set_int_vector(i, bad_interrupt);`
393
394			`/* initialize the bottom half routines. */`
395			`for (i = 0; i < 32; i++) {`
396			`bh_base[i].routine = NULL;`
397			`bh_base[i].data = NULL;`
398			`}`
399			`bh_active = 0;`
400			`intr_count = 0;`
401			`}`