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-rw-r--r--arch/m68k/amiga/amiints.c520
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diff --git a/arch/m68k/amiga/amiints.c b/arch/m68k/amiga/amiints.c
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+/*
+ * linux/arch/m68k/amiga/amiints.c -- Amiga Linux interrupt handling code
+ *
+ * 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.
+ *
+ * 11/07/96: rewritten interrupt handling, irq lists are exists now only for
+ * this sources where it makes sense (VERTB/PORTS/EXTER) and you must
+ * be careful that dev_id for this sources is unique since this the
+ * only possibility to distinguish between different handlers for
+ * free_irq. irq lists also have different irq flags:
+ * - IRQ_FLG_FAST: handler is inserted at top of list (after other
+ * fast handlers)
+ * - IRQ_FLG_SLOW: handler is inserted at bottom of list and before
+ * they're executed irq level is set to the previous
+ * one, but handlers don't need to be reentrant, if
+ * reentrance occurred, slow handlers will be just
+ * called again.
+ * The whole interrupt handling for CIAs is moved to cia.c
+ * /Roman Zippel
+ *
+ * 07/08/99: rewamp of the interrupt handling - we now have two types of
+ * interrupts, normal and fast handlers, fast handlers being
+ * marked with SA_INTERRUPT and runs with all other interrupts
+ * disabled. Normal interrupts disable their own source but
+ * run with all other interrupt sources enabled.
+ * PORTS and EXTER interrupts are always shared even if the
+ * drivers do not explicitly mark this when calling
+ * request_irq which they really should do.
+ * This is similar to the way interrupts are handled on all
+ * other architectures and makes a ton of sense besides
+ * having the advantage of making it easier to share
+ * drivers.
+ * /Jes
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/kernel_stat.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/seq_file.h>
+
+#include <asm/system.h>
+#include <asm/irq.h>
+#include <asm/traps.h>
+#include <asm/amigahw.h>
+#include <asm/amigaints.h>
+#include <asm/amipcmcia.h>
+
+extern int cia_request_irq(struct ciabase *base,int irq,
+ irqreturn_t (*handler)(int, void *, struct pt_regs *),
+ unsigned long flags, const char *devname, void *dev_id);
+extern void cia_free_irq(struct ciabase *base, unsigned int irq, void *dev_id);
+extern void cia_init_IRQ(struct ciabase *base);
+extern int cia_get_irq_list(struct ciabase *base, struct seq_file *p);
+
+/* irq node variables for amiga interrupt sources */
+static irq_node_t *ami_irq_list[AMI_STD_IRQS];
+
+static unsigned short amiga_intena_vals[AMI_STD_IRQS] = {
+ [IRQ_AMIGA_VERTB] = IF_VERTB,
+ [IRQ_AMIGA_COPPER] = IF_COPER,
+ [IRQ_AMIGA_AUD0] = IF_AUD0,
+ [IRQ_AMIGA_AUD1] = IF_AUD1,
+ [IRQ_AMIGA_AUD2] = IF_AUD2,
+ [IRQ_AMIGA_AUD3] = IF_AUD3,
+ [IRQ_AMIGA_BLIT] = IF_BLIT,
+ [IRQ_AMIGA_DSKSYN] = IF_DSKSYN,
+ [IRQ_AMIGA_DSKBLK] = IF_DSKBLK,
+ [IRQ_AMIGA_RBF] = IF_RBF,
+ [IRQ_AMIGA_TBE] = IF_TBE,
+ [IRQ_AMIGA_SOFT] = IF_SOFT,
+ [IRQ_AMIGA_PORTS] = IF_PORTS,
+ [IRQ_AMIGA_EXTER] = IF_EXTER
+};
+static const unsigned char ami_servers[AMI_STD_IRQS] = {
+ [IRQ_AMIGA_VERTB] = 1,
+ [IRQ_AMIGA_PORTS] = 1,
+ [IRQ_AMIGA_EXTER] = 1
+};
+
+static short ami_ablecount[AMI_IRQS];
+
+static irqreturn_t ami_badint(int irq, void *dev_id, struct pt_regs *fp)
+{
+ num_spurious += 1;
+ return IRQ_NONE;
+}
+
+/*
+ * void amiga_init_IRQ(void)
+ *
+ * Parameters: None
+ *
+ * Returns: Nothing
+ *
+ * This function should be called during kernel startup to initialize
+ * the amiga IRQ handling routines.
+ */
+
+void __init amiga_init_IRQ(void)
+{
+ int i;
+
+ /* initialize handlers */
+ for (i = 0; i < AMI_STD_IRQS; i++) {
+ if (ami_servers[i]) {
+ ami_irq_list[i] = NULL;
+ } else {
+ ami_irq_list[i] = new_irq_node();
+ ami_irq_list[i]->handler = ami_badint;
+ ami_irq_list[i]->flags = 0;
+ ami_irq_list[i]->dev_id = NULL;
+ ami_irq_list[i]->devname = NULL;
+ ami_irq_list[i]->next = NULL;
+ }
+ }
+ for (i = 0; i < AMI_IRQS; i++)
+ ami_ablecount[i] = 0;
+
+ /* turn off PCMCIA interrupts */
+ if (AMIGAHW_PRESENT(PCMCIA))
+ gayle.inten = GAYLE_IRQ_IDE;
+
+ /* turn off all interrupts and enable the master interrupt bit */
+ custom.intena = 0x7fff;
+ custom.intreq = 0x7fff;
+ custom.intena = IF_SETCLR | IF_INTEN;
+
+ cia_init_IRQ(&ciaa_base);
+ cia_init_IRQ(&ciab_base);
+}
+
+static inline int amiga_insert_irq(irq_node_t **list, irq_node_t *node)
+{
+ unsigned long flags;
+ irq_node_t *cur;
+
+ if (!node->dev_id)
+ printk("%s: Warning: dev_id of %s is zero\n",
+ __FUNCTION__, node->devname);
+
+ local_irq_save(flags);
+
+ cur = *list;
+
+ if (node->flags & SA_INTERRUPT) {
+ if (node->flags & SA_SHIRQ)
+ return -EBUSY;
+ /*
+ * There should never be more than one
+ */
+ while (cur && cur->flags & SA_INTERRUPT) {
+ list = &cur->next;
+ cur = cur->next;
+ }
+ } else {
+ while (cur) {
+ list = &cur->next;
+ cur = cur->next;
+ }
+ }
+
+ node->next = cur;
+ *list = node;
+
+ local_irq_restore(flags);
+ return 0;
+}
+
+static inline void amiga_delete_irq(irq_node_t **list, void *dev_id)
+{
+ unsigned long flags;
+ irq_node_t *node;
+
+ local_irq_save(flags);
+
+ for (node = *list; node; list = &node->next, node = *list) {
+ if (node->dev_id == dev_id) {
+ *list = node->next;
+ /* Mark it as free. */
+ node->handler = NULL;
+ local_irq_restore(flags);
+ return;
+ }
+ }
+ local_irq_restore(flags);
+ printk ("%s: tried to remove invalid irq\n", __FUNCTION__);
+}
+
+/*
+ * amiga_request_irq : add an interrupt service routine for a particular
+ * machine specific interrupt source.
+ * If the addition was successful, it returns 0.
+ */
+
+int amiga_request_irq(unsigned int irq,
+ irqreturn_t (*handler)(int, void *, struct pt_regs *),
+ unsigned long flags, const char *devname, void *dev_id)
+{
+ irq_node_t *node;
+ int error = 0;
+
+ if (irq >= AMI_IRQS) {
+ printk ("%s: Unknown IRQ %d from %s\n", __FUNCTION__,
+ irq, devname);
+ return -ENXIO;
+ }
+
+ if (irq >= IRQ_AMIGA_AUTO)
+ return cpu_request_irq(irq - IRQ_AMIGA_AUTO, handler,
+ flags, devname, dev_id);
+
+ if (irq >= IRQ_AMIGA_CIAB)
+ return cia_request_irq(&ciab_base, irq - IRQ_AMIGA_CIAB,
+ handler, flags, devname, dev_id);
+
+ if (irq >= IRQ_AMIGA_CIAA)
+ return cia_request_irq(&ciaa_base, irq - IRQ_AMIGA_CIAA,
+ handler, flags, devname, dev_id);
+
+ /*
+ * IRQ_AMIGA_PORTS & IRQ_AMIGA_EXTER defaults to shared,
+ * we could add a check here for the SA_SHIRQ flag but all drivers
+ * should be aware of sharing anyway.
+ */
+ if (ami_servers[irq]) {
+ if (!(node = new_irq_node()))
+ return -ENOMEM;
+ node->handler = handler;
+ node->flags = flags;
+ node->dev_id = dev_id;
+ node->devname = devname;
+ node->next = NULL;
+ error = amiga_insert_irq(&ami_irq_list[irq], node);
+ } else {
+ ami_irq_list[irq]->handler = handler;
+ ami_irq_list[irq]->flags = flags;
+ ami_irq_list[irq]->dev_id = dev_id;
+ ami_irq_list[irq]->devname = devname;
+ }
+
+ /* enable the interrupt */
+ if (irq < IRQ_AMIGA_PORTS && !ami_ablecount[irq])
+ custom.intena = IF_SETCLR | amiga_intena_vals[irq];
+
+ return error;
+}
+
+void amiga_free_irq(unsigned int irq, void *dev_id)
+{
+ if (irq >= AMI_IRQS) {
+ printk ("%s: Unknown IRQ %d\n", __FUNCTION__, irq);
+ return;
+ }
+
+ if (irq >= IRQ_AMIGA_AUTO)
+ cpu_free_irq(irq - IRQ_AMIGA_AUTO, dev_id);
+
+ if (irq >= IRQ_AMIGA_CIAB) {
+ cia_free_irq(&ciab_base, irq - IRQ_AMIGA_CIAB, dev_id);
+ return;
+ }
+
+ if (irq >= IRQ_AMIGA_CIAA) {
+ cia_free_irq(&ciaa_base, irq - IRQ_AMIGA_CIAA, dev_id);
+ return;
+ }
+
+ if (ami_servers[irq]) {
+ amiga_delete_irq(&ami_irq_list[irq], dev_id);
+ /* if server list empty, disable the interrupt */
+ if (!ami_irq_list[irq] && irq < IRQ_AMIGA_PORTS)
+ custom.intena = amiga_intena_vals[irq];
+ } else {
+ if (ami_irq_list[irq]->dev_id != dev_id)
+ printk("%s: removing probably wrong IRQ %d from %s\n",
+ __FUNCTION__, irq, ami_irq_list[irq]->devname);
+ ami_irq_list[irq]->handler = ami_badint;
+ ami_irq_list[irq]->flags = 0;
+ ami_irq_list[irq]->dev_id = NULL;
+ ami_irq_list[irq]->devname = NULL;
+ custom.intena = amiga_intena_vals[irq];
+ }
+}
+
+/*
+ * Enable/disable a particular machine specific interrupt source.
+ * Note that this may affect other interrupts in case of a shared interrupt.
+ * This function should only be called for a _very_ short time to change some
+ * internal data, that may not be changed by the interrupt at the same time.
+ * ami_(enable|disable)_irq calls may also be nested.
+ */
+
+void amiga_enable_irq(unsigned int irq)
+{
+ if (irq >= AMI_IRQS) {
+ printk("%s: Unknown IRQ %d\n", __FUNCTION__, irq);
+ return;
+ }
+
+ if (--ami_ablecount[irq])
+ return;
+
+ /* No action for auto-vector interrupts */
+ if (irq >= IRQ_AMIGA_AUTO){
+ printk("%s: Trying to enable auto-vector IRQ %i\n",
+ __FUNCTION__, irq - IRQ_AMIGA_AUTO);
+ return;
+ }
+
+ if (irq >= IRQ_AMIGA_CIAB) {
+ cia_set_irq(&ciab_base, (1 << (irq - IRQ_AMIGA_CIAB)));
+ cia_able_irq(&ciab_base, CIA_ICR_SETCLR |
+ (1 << (irq - IRQ_AMIGA_CIAB)));
+ return;
+ }
+
+ if (irq >= IRQ_AMIGA_CIAA) {
+ cia_set_irq(&ciaa_base, (1 << (irq - IRQ_AMIGA_CIAA)));
+ cia_able_irq(&ciaa_base, CIA_ICR_SETCLR |
+ (1 << (irq - IRQ_AMIGA_CIAA)));
+ return;
+ }
+
+ /* enable the interrupt */
+ custom.intena = IF_SETCLR | amiga_intena_vals[irq];
+}
+
+void amiga_disable_irq(unsigned int irq)
+{
+ if (irq >= AMI_IRQS) {
+ printk("%s: Unknown IRQ %d\n", __FUNCTION__, irq);
+ return;
+ }
+
+ if (ami_ablecount[irq]++)
+ return;
+
+ /* No action for auto-vector interrupts */
+ if (irq >= IRQ_AMIGA_AUTO) {
+ printk("%s: Trying to disable auto-vector IRQ %i\n",
+ __FUNCTION__, irq - IRQ_AMIGA_AUTO);
+ return;
+ }
+
+ if (irq >= IRQ_AMIGA_CIAB) {
+ cia_able_irq(&ciab_base, 1 << (irq - IRQ_AMIGA_CIAB));
+ return;
+ }
+
+ if (irq >= IRQ_AMIGA_CIAA) {
+ cia_able_irq(&ciaa_base, 1 << (irq - IRQ_AMIGA_CIAA));
+ return;
+ }
+
+ /* disable the interrupt */
+ custom.intena = amiga_intena_vals[irq];
+}
+
+inline void amiga_do_irq(int irq, struct pt_regs *fp)
+{
+ kstat_cpu(0).irqs[SYS_IRQS + irq]++;
+ ami_irq_list[irq]->handler(irq, ami_irq_list[irq]->dev_id, fp);
+}
+
+void amiga_do_irq_list(int irq, struct pt_regs *fp)
+{
+ irq_node_t *node;
+
+ kstat_cpu(0).irqs[SYS_IRQS + irq]++;
+
+ custom.intreq = amiga_intena_vals[irq];
+
+ for (node = ami_irq_list[irq]; node; node = node->next)
+ node->handler(irq, node->dev_id, fp);
+}
+
+/*
+ * The builtin Amiga hardware interrupt handlers.
+ */
+
+static irqreturn_t ami_int1(int irq, void *dev_id, struct pt_regs *fp)
+{
+ unsigned short ints = custom.intreqr & custom.intenar;
+
+ /* if serial transmit buffer empty, interrupt */
+ if (ints & IF_TBE) {
+ custom.intreq = IF_TBE;
+ amiga_do_irq(IRQ_AMIGA_TBE, fp);
+ }
+
+ /* if floppy disk transfer complete, interrupt */
+ if (ints & IF_DSKBLK) {
+ custom.intreq = IF_DSKBLK;
+ amiga_do_irq(IRQ_AMIGA_DSKBLK, fp);
+ }
+
+ /* if software interrupt set, interrupt */
+ if (ints & IF_SOFT) {
+ custom.intreq = IF_SOFT;
+ amiga_do_irq(IRQ_AMIGA_SOFT, fp);
+ }
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t ami_int3(int irq, void *dev_id, struct pt_regs *fp)
+{
+ unsigned short ints = custom.intreqr & custom.intenar;
+
+ /* if a blitter interrupt */
+ if (ints & IF_BLIT) {
+ custom.intreq = IF_BLIT;
+ amiga_do_irq(IRQ_AMIGA_BLIT, fp);
+ }
+
+ /* if a copper interrupt */
+ if (ints & IF_COPER) {
+ custom.intreq = IF_COPER;
+ amiga_do_irq(IRQ_AMIGA_COPPER, fp);
+ }
+
+ /* if a vertical blank interrupt */
+ if (ints & IF_VERTB)
+ amiga_do_irq_list(IRQ_AMIGA_VERTB, fp);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t ami_int4(int irq, void *dev_id, struct pt_regs *fp)
+{
+ unsigned short ints = custom.intreqr & custom.intenar;
+
+ /* if audio 0 interrupt */
+ if (ints & IF_AUD0) {
+ custom.intreq = IF_AUD0;
+ amiga_do_irq(IRQ_AMIGA_AUD0, fp);
+ }
+
+ /* if audio 1 interrupt */
+ if (ints & IF_AUD1) {
+ custom.intreq = IF_AUD1;
+ amiga_do_irq(IRQ_AMIGA_AUD1, fp);
+ }
+
+ /* if audio 2 interrupt */
+ if (ints & IF_AUD2) {
+ custom.intreq = IF_AUD2;
+ amiga_do_irq(IRQ_AMIGA_AUD2, fp);
+ }
+
+ /* if audio 3 interrupt */
+ if (ints & IF_AUD3) {
+ custom.intreq = IF_AUD3;
+ amiga_do_irq(IRQ_AMIGA_AUD3, fp);
+ }
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t ami_int5(int irq, void *dev_id, struct pt_regs *fp)
+{
+ unsigned short ints = custom.intreqr & custom.intenar;
+
+ /* if serial receive buffer full interrupt */
+ if (ints & IF_RBF) {
+ /* acknowledge of IF_RBF must be done by the serial interrupt */
+ amiga_do_irq(IRQ_AMIGA_RBF, fp);
+ }
+
+ /* if a disk sync interrupt */
+ if (ints & IF_DSKSYN) {
+ custom.intreq = IF_DSKSYN;
+ amiga_do_irq(IRQ_AMIGA_DSKSYN, fp);
+ }
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t ami_int7(int irq, void *dev_id, struct pt_regs *fp)
+{
+ panic ("level 7 interrupt received\n");
+}
+
+irqreturn_t (*amiga_default_handler[SYS_IRQS])(int, void *, struct pt_regs *) = {
+ [0] = ami_badint,
+ [1] = ami_int1,
+ [2] = ami_badint,
+ [3] = ami_int3,
+ [4] = ami_int4,
+ [5] = ami_int5,
+ [6] = ami_badint,
+ [7] = ami_int7
+};
+
+int show_amiga_interrupts(struct seq_file *p, void *v)
+{
+ int i;
+ irq_node_t *node;
+
+ for (i = 0; i < AMI_STD_IRQS; i++) {
+ if (!(node = ami_irq_list[i]))
+ continue;
+ seq_printf(p, "ami %2d: %10u ", i,
+ kstat_cpu(0).irqs[SYS_IRQS + i]);
+ do {
+ if (node->flags & SA_INTERRUPT)
+ seq_puts(p, "F ");
+ else
+ seq_puts(p, " ");
+ seq_printf(p, "%s\n", node->devname);
+ if ((node = node->next))
+ seq_puts(p, " ");
+ } while (node);
+ }
+
+ cia_get_irq_list(&ciaa_base, p);
+ cia_get_irq_list(&ciab_base, p);
+ return 0;
+}