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Diffstat (limited to 'arch/m68k/atari/ataints.c')
-rw-r--r--arch/m68k/atari/ataints.c648
1 files changed, 648 insertions, 0 deletions
diff --git a/arch/m68k/atari/ataints.c b/arch/m68k/atari/ataints.c
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+++ b/arch/m68k/atari/ataints.c
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+/*
+ * 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 <asm/system.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>
+
+
+/*
+ * 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().
+ *
+ * Each interrupt can be of three types:
+ *
+ * - SLOW: The handler runs with all interrupts enabled, except the one it
+ * was called by (to avoid reentering). This should be the usual method.
+ * But it is currently possible only for MFP ints, since only the MFP
+ * offers an easy way to mask interrupts.
+ *
+ * - FAST: The handler runs with all interrupts disabled. This should be used
+ * only for really fast handlers, that just do actions immediately
+ * necessary, and let the rest do a bottom half or task queue.
+ *
+ * - PRIORITIZED: The handler can be interrupted by higher-level ints
+ * (greater IPL, no MFP priorities!). This is the method of choice for ints
+ * which should be slow, but are not from a MFP.
+ *
+ * The feature of more than one handler for one int source is still there, but
+ * only applicable if all handers are of the same type. To not slow down
+ * processing of ints with only one handler by the chaining feature, the list
+ * calling function atari_call_irq_list() is only plugged in at the time the
+ * second handler is registered.
+ *
+ * Implementation notes: For fast-as-possible int handling, there are separate
+ * entry points for each type (slow/fast/prio). The assembler handler calls
+ * the irq directly in the usual case, no C wrapper is involved. In case of
+ * multiple handlers, atari_call_irq_list() is registered as handler and calls
+ * in turn the real irq's. To ease access from assembler level to the irq
+ * function pointer and accompanying data, these two are stored in a separate
+ * array, irq_handler[]. The rest of data (type, name) are put into a second
+ * array, irq_param, that is accessed from C only. For each slow interrupt (32
+ * in all) there are separate handler functions, which makes it possible to
+ * hard-code the MFP register address and value, are necessary to mask the
+ * int. If there'd be only one generic function, lots of calculations would be
+ * needed to determine MFP register and int mask from the vector number :-(
+ *
+ * Furthermore, slow ints may not lower the IPL below its previous value
+ * (before the int happened). This is needed so that an int of class PRIO, on
+ * that this int may be stacked, cannot be reentered. This feature is
+ * implemented as follows: If the stack frame format is 1 (throwaway), the int
+ * is not stacked, and the IPL is anded with 0xfbff, resulting in a new level
+ * 2, which still blocks the HSYNC, but no interrupts of interest. If the
+ * frame format is 0, the int is nested, and the old IPL value can be found in
+ * the sr copy in the frame.
+ */
+
+
+#define NUM_INT_SOURCES (8 + NUM_ATARI_SOURCES)
+
+typedef void (*asm_irq_handler)(void);
+
+struct irqhandler {
+ irqreturn_t (*handler)(int, void *, struct pt_regs *);
+ void *dev_id;
+};
+
+struct irqparam {
+ unsigned long flags;
+ const char *devname;
+};
+
+/*
+ * Array with irq's and their parameter data. This array is accessed from low
+ * level assembler code, so an element size of 8 allows usage of index scaling
+ * addressing mode.
+ */
+static struct irqhandler irq_handler[NUM_INT_SOURCES];
+
+/*
+ * This array hold the rest of parameters of int handlers: type
+ * (slow,fast,prio) and the name of the handler. These values are only
+ * accessed from C
+ */
+static struct irqparam irq_param[NUM_INT_SOURCES];
+
+/*
+ * 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;
+
+/* check for valid int number (complex, sigh...) */
+#define IS_VALID_INTNO(n) \
+ ((n) > 0 && \
+ /* autovec and ST-MFP ok anyway */ \
+ (((n) < TTMFP_SOURCE_BASE) || \
+ /* TT-MFP ok if present */ \
+ ((n) >= TTMFP_SOURCE_BASE && (n) < SCC_SOURCE_BASE && \
+ ATARIHW_PRESENT(TT_MFP)) || \
+ /* SCC ok if present and number even */ \
+ ((n) >= SCC_SOURCE_BASE && (n) < VME_SOURCE_BASE && \
+ !((n) & 1) && ATARIHW_PRESENT(SCC)) || \
+ /* greater numbers ok if they are registered VME vectors */ \
+ ((n) >= VME_SOURCE_BASE && (n) < VME_SOURCE_BASE + VME_MAX_SOURCES && \
+ free_vme_vec_bitmap & (1 << ((n) - VME_SOURCE_BASE)))))
+
+
+/*
+ * Here start the assembler entry points for interrupts
+ */
+
+#define IRQ_NAME(nr) atari_slow_irq_##nr##_handler(void)
+
+#define BUILD_SLOW_IRQ(n) \
+asmlinkage void IRQ_NAME(n); \
+/* Dummy function to allow asm with operands. */ \
+void atari_slow_irq_##n##_dummy (void) { \
+__asm__ (__ALIGN_STR "\n" \
+"atari_slow_irq_" #n "_handler:\t" \
+" addl %6,%5\n" /* preempt_count() += HARDIRQ_OFFSET */ \
+ SAVE_ALL_INT "\n" \
+ GET_CURRENT(%%d0) "\n" \
+" andb #~(1<<(%c3&7)),%a4:w\n" /* mask this interrupt */ \
+ /* get old IPL from stack frame */ \
+" bfextu %%sp@(%c2){#5,#3},%%d0\n" \
+" movew %%sr,%%d1\n" \
+" bfins %%d0,%%d1{#21,#3}\n" \
+" movew %%d1,%%sr\n" /* set IPL = previous value */ \
+" addql #1,%a0\n" \
+" lea %a1,%%a0\n" \
+" pea %%sp@\n" /* push addr of frame */ \
+" movel %%a0@(4),%%sp@-\n" /* push handler data */ \
+" pea (%c3+8)\n" /* push int number */ \
+" movel %%a0@,%%a0\n" \
+" jbsr %%a0@\n" /* call the handler */ \
+" addql #8,%%sp\n" \
+" addql #4,%%sp\n" \
+" orw #0x0600,%%sr\n" \
+" andw #0xfeff,%%sr\n" /* set IPL = 6 again */ \
+" orb #(1<<(%c3&7)),%a4:w\n" /* now unmask the int again */ \
+" jbra ret_from_interrupt\n" \
+ : : "i" (&kstat_cpu(0).irqs[n+8]), "i" (&irq_handler[n+8]), \
+ "n" (PT_OFF_SR), "n" (n), \
+ "i" (n & 8 ? (n & 16 ? &tt_mfp.int_mk_a : &mfp.int_mk_a) \
+ : (n & 16 ? &tt_mfp.int_mk_b : &mfp.int_mk_b)), \
+ "m" (preempt_count()), "di" (HARDIRQ_OFFSET) \
+); \
+ for (;;); /* fake noreturn */ \
+}
+
+BUILD_SLOW_IRQ(0);
+BUILD_SLOW_IRQ(1);
+BUILD_SLOW_IRQ(2);
+BUILD_SLOW_IRQ(3);
+BUILD_SLOW_IRQ(4);
+BUILD_SLOW_IRQ(5);
+BUILD_SLOW_IRQ(6);
+BUILD_SLOW_IRQ(7);
+BUILD_SLOW_IRQ(8);
+BUILD_SLOW_IRQ(9);
+BUILD_SLOW_IRQ(10);
+BUILD_SLOW_IRQ(11);
+BUILD_SLOW_IRQ(12);
+BUILD_SLOW_IRQ(13);
+BUILD_SLOW_IRQ(14);
+BUILD_SLOW_IRQ(15);
+BUILD_SLOW_IRQ(16);
+BUILD_SLOW_IRQ(17);
+BUILD_SLOW_IRQ(18);
+BUILD_SLOW_IRQ(19);
+BUILD_SLOW_IRQ(20);
+BUILD_SLOW_IRQ(21);
+BUILD_SLOW_IRQ(22);
+BUILD_SLOW_IRQ(23);
+BUILD_SLOW_IRQ(24);
+BUILD_SLOW_IRQ(25);
+BUILD_SLOW_IRQ(26);
+BUILD_SLOW_IRQ(27);
+BUILD_SLOW_IRQ(28);
+BUILD_SLOW_IRQ(29);
+BUILD_SLOW_IRQ(30);
+BUILD_SLOW_IRQ(31);
+
+asm_irq_handler slow_handlers[32] = {
+ [0] = atari_slow_irq_0_handler,
+ [1] = atari_slow_irq_1_handler,
+ [2] = atari_slow_irq_2_handler,
+ [3] = atari_slow_irq_3_handler,
+ [4] = atari_slow_irq_4_handler,
+ [5] = atari_slow_irq_5_handler,
+ [6] = atari_slow_irq_6_handler,
+ [7] = atari_slow_irq_7_handler,
+ [8] = atari_slow_irq_8_handler,
+ [9] = atari_slow_irq_9_handler,
+ [10] = atari_slow_irq_10_handler,
+ [11] = atari_slow_irq_11_handler,
+ [12] = atari_slow_irq_12_handler,
+ [13] = atari_slow_irq_13_handler,
+ [14] = atari_slow_irq_14_handler,
+ [15] = atari_slow_irq_15_handler,
+ [16] = atari_slow_irq_16_handler,
+ [17] = atari_slow_irq_17_handler,
+ [18] = atari_slow_irq_18_handler,
+ [19] = atari_slow_irq_19_handler,
+ [20] = atari_slow_irq_20_handler,
+ [21] = atari_slow_irq_21_handler,
+ [22] = atari_slow_irq_22_handler,
+ [23] = atari_slow_irq_23_handler,
+ [24] = atari_slow_irq_24_handler,
+ [25] = atari_slow_irq_25_handler,
+ [26] = atari_slow_irq_26_handler,
+ [27] = atari_slow_irq_27_handler,
+ [28] = atari_slow_irq_28_handler,
+ [29] = atari_slow_irq_29_handler,
+ [30] = atari_slow_irq_30_handler,
+ [31] = atari_slow_irq_31_handler
+};
+
+asmlinkage void atari_fast_irq_handler( void );
+asmlinkage void atari_prio_irq_handler( void );
+
+/* Dummy function to allow asm with operands. */
+void atari_fast_prio_irq_dummy (void) {
+__asm__ (__ALIGN_STR "\n"
+"atari_fast_irq_handler:\n\t"
+ "orw #0x700,%%sr\n" /* disable all interrupts */
+"atari_prio_irq_handler:\n\t"
+ "addl %3,%2\n\t" /* preempt_count() += HARDIRQ_OFFSET */
+ SAVE_ALL_INT "\n\t"
+ GET_CURRENT(%%d0) "\n\t"
+ /* get vector number from stack frame and convert to source */
+ "bfextu %%sp@(%c1){#4,#10},%%d0\n\t"
+ "subw #(0x40-8),%%d0\n\t"
+ "jpl 1f\n\t"
+ "addw #(0x40-8-0x18),%%d0\n"
+ "1:\tlea %a0,%%a0\n\t"
+ "addql #1,%%a0@(%%d0:l:4)\n\t"
+ "lea irq_handler,%%a0\n\t"
+ "lea %%a0@(%%d0:l:8),%%a0\n\t"
+ "pea %%sp@\n\t" /* push frame address */
+ "movel %%a0@(4),%%sp@-\n\t" /* push handler data */
+ "movel %%d0,%%sp@-\n\t" /* push int number */
+ "movel %%a0@,%%a0\n\t"
+ "jsr %%a0@\n\t" /* and call the handler */
+ "addql #8,%%sp\n\t"
+ "addql #4,%%sp\n\t"
+ "jbra ret_from_interrupt"
+ : : "i" (&kstat_cpu(0).irqs), "n" (PT_OFF_FORMATVEC),
+ "m" (preempt_count()), "di" (HARDIRQ_OFFSET)
+);
+ for (;;);
+}
+
+/* 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");
+
+/* Defined in entry.S; only increments 'num_spurious' */
+asmlinkage void bad_interrupt(void);
+
+extern void atari_microwire_cmd( int cmd );
+
+extern int atari_SCC_reset_done;
+
+/*
+ * 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)
+{
+ int i;
+
+ /* initialize the vector table */
+ for (i = 0; i < NUM_INT_SOURCES; ++i) {
+ vectors[IRQ_SOURCE_TO_VECTOR(i)] = bad_interrupt;
+ }
+
+ /* Initialize the MFP(s) */
+
+#ifdef ATARI_USE_SOFTWARE_EOI
+ mfp.vec_adr = 0x48; /* Software EOI-Mode */
+#else
+ mfp.vec_adr = 0x40; /* Automatic EOI-Mode */
+#endif
+ mfp.int_en_a = 0x00; /* turn off MFP-Ints */
+ mfp.int_en_b = 0x00;
+ mfp.int_mk_a = 0xff; /* no Masking */
+ 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) {
+ scc.cha_a_ctrl = 9;
+ MFPDELAY();
+ 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)
+ */
+
+ if (!MACH_IS_HADES)
+ vectors[VEC_INT2] = 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;
+}
+
+
+static irqreturn_t atari_call_irq_list( int irq, void *dev_id, struct pt_regs *fp )
+{
+ irq_node_t *node;
+
+ for (node = (irq_node_t *)dev_id; node; node = node->next)
+ node->handler(irq, node->dev_id, fp);
+ return IRQ_HANDLED;
+}
+
+
+/*
+ * atari_request_irq : add an interrupt service routine for a particular
+ * machine specific interrupt source.
+ * If the addition was successful, it returns 0.
+ */
+
+int atari_request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *),
+ unsigned long flags, const char *devname, void *dev_id)
+{
+ int vector;
+ unsigned long oflags = flags;
+
+ /*
+ * The following is a hack to make some PCI card drivers work,
+ * which set the SA_SHIRQ flag.
+ */
+
+ flags &= ~SA_SHIRQ;
+
+ if (flags == SA_INTERRUPT) {
+ printk ("%s: SA_INTERRUPT changed to IRQ_TYPE_SLOW for %s\n",
+ __FUNCTION__, devname);
+ flags = IRQ_TYPE_SLOW;
+ }
+ if (flags < IRQ_TYPE_SLOW || flags > IRQ_TYPE_PRIO) {
+ printk ("%s: Bad irq type 0x%lx <0x%lx> requested from %s\n",
+ __FUNCTION__, flags, oflags, devname);
+ return -EINVAL;
+ }
+ if (!IS_VALID_INTNO(irq)) {
+ printk ("%s: Unknown irq %d requested from %s\n",
+ __FUNCTION__, irq, devname);
+ return -ENXIO;
+ }
+ vector = IRQ_SOURCE_TO_VECTOR(irq);
+
+ /*
+ * Check type/source combination: slow ints are (currently)
+ * only possible for MFP-interrupts.
+ */
+ if (flags == IRQ_TYPE_SLOW &&
+ (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE)) {
+ printk ("%s: Slow irq requested for non-MFP source %d from %s\n",
+ __FUNCTION__, irq, devname);
+ return -EINVAL;
+ }
+
+ if (vectors[vector] == bad_interrupt) {
+ /* int has no handler yet */
+ irq_handler[irq].handler = handler;
+ irq_handler[irq].dev_id = dev_id;
+ irq_param[irq].flags = flags;
+ irq_param[irq].devname = devname;
+ vectors[vector] =
+ (flags == IRQ_TYPE_SLOW) ? slow_handlers[irq-STMFP_SOURCE_BASE] :
+ (flags == IRQ_TYPE_FAST) ? atari_fast_irq_handler :
+ atari_prio_irq_handler;
+ /* If MFP int, also enable and umask it */
+ atari_turnon_irq(irq);
+ atari_enable_irq(irq);
+
+ return 0;
+ }
+ else if (irq_param[irq].flags == flags) {
+ /* old handler is of same type -> handlers can be chained */
+ irq_node_t *node;
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ if (irq_handler[irq].handler != atari_call_irq_list) {
+ /* Only one handler yet, make a node for this first one */
+ if (!(node = new_irq_node()))
+ return -ENOMEM;
+ node->handler = irq_handler[irq].handler;
+ node->dev_id = irq_handler[irq].dev_id;
+ node->devname = irq_param[irq].devname;
+ node->next = NULL;
+
+ irq_handler[irq].handler = atari_call_irq_list;
+ irq_handler[irq].dev_id = node;
+ irq_param[irq].devname = "chained";
+ }
+
+ if (!(node = new_irq_node()))
+ return -ENOMEM;
+ node->handler = handler;
+ node->dev_id = dev_id;
+ node->devname = devname;
+ /* new handlers are put in front of the queue */
+ node->next = irq_handler[irq].dev_id;
+ irq_handler[irq].dev_id = node;
+
+ local_irq_restore(flags);
+ return 0;
+ } else {
+ printk ("%s: Irq %d allocated by other type int (call from %s)\n",
+ __FUNCTION__, irq, devname);
+ return -EBUSY;
+ }
+}
+
+void atari_free_irq(unsigned int irq, void *dev_id)
+{
+ unsigned long flags;
+ int vector;
+ irq_node_t **list, *node;
+
+ if (!IS_VALID_INTNO(irq)) {
+ printk("%s: Unknown irq %d\n", __FUNCTION__, irq);
+ return;
+ }
+
+ vector = IRQ_SOURCE_TO_VECTOR(irq);
+ if (vectors[vector] == bad_interrupt)
+ goto not_found;
+
+ local_irq_save(flags);
+
+ if (irq_handler[irq].handler != atari_call_irq_list) {
+ /* It's the only handler for the interrupt */
+ if (irq_handler[irq].dev_id != dev_id) {
+ local_irq_restore(flags);
+ goto not_found;
+ }
+ irq_handler[irq].handler = NULL;
+ irq_handler[irq].dev_id = NULL;
+ irq_param[irq].devname = NULL;
+ vectors[vector] = bad_interrupt;
+ /* If MFP int, also disable it */
+ atari_disable_irq(irq);
+ atari_turnoff_irq(irq);
+
+ local_irq_restore(flags);
+ return;
+ }
+
+ /* The interrupt is chained, find the irq on the list */
+ for(list = (irq_node_t **)&irq_handler[irq].dev_id; *list; list = &(*list)->next) {
+ if ((*list)->dev_id == dev_id) break;
+ }
+ if (!*list) {
+ local_irq_restore(flags);
+ goto not_found;
+ }
+
+ (*list)->handler = NULL; /* Mark it as free for reallocation */
+ *list = (*list)->next;
+
+ /* If there's now only one handler, unchain the interrupt, i.e. plug in
+ * the handler directly again and omit atari_call_irq_list */
+ node = (irq_node_t *)irq_handler[irq].dev_id;
+ if (node && !node->next) {
+ irq_handler[irq].handler = node->handler;
+ irq_handler[irq].dev_id = node->dev_id;
+ irq_param[irq].devname = node->devname;
+ node->handler = NULL; /* Mark it as free for reallocation */
+ }
+
+ local_irq_restore(flags);
+ return;
+
+not_found:
+ printk("%s: tried to remove invalid irq\n", __FUNCTION__);
+ return;
+}
+
+
+/*
+ * atari_register_vme_int() returns the number of a free interrupt vector for
+ * hardware with a programmable int vector (probably a VME board).
+ */
+
+unsigned long 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);
+}
+
+
+void atari_unregister_vme_int(unsigned long irq)
+{
+ if(irq >= VME_SOURCE_BASE && irq < VME_SOURCE_BASE + VME_MAX_SOURCES) {
+ irq -= VME_SOURCE_BASE;
+ free_vme_vec_bitmap &= ~(1 << irq);
+ }
+}
+
+
+int show_atari_interrupts(struct seq_file *p, void *v)
+{
+ int i;
+
+ for (i = 0; i < NUM_INT_SOURCES; ++i) {
+ if (vectors[IRQ_SOURCE_TO_VECTOR(i)] == bad_interrupt)
+ continue;
+ if (i < STMFP_SOURCE_BASE)
+ seq_printf(p, "auto %2d: %10u ",
+ i, kstat_cpu(0).irqs[i]);
+ else
+ seq_printf(p, "vec $%02x: %10u ",
+ IRQ_SOURCE_TO_VECTOR(i),
+ kstat_cpu(0).irqs[i]);
+
+ if (irq_handler[i].handler != atari_call_irq_list) {
+ seq_printf(p, "%s\n", irq_param[i].devname);
+ }
+ else {
+ irq_node_t *n;
+ for( n = (irq_node_t *)irq_handler[i].dev_id; n; n = n->next ) {
+ seq_printf(p, "%s\n", n->devname);
+ if (n->next)
+ seq_puts(p, " " );
+ }
+ }
+ }
+ if (num_spurious)
+ seq_printf(p, "spurio.: %10u\n", num_spurious);
+
+ return 0;
+}
+
+