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-rw-r--r--arch/m68knommu/platform/68360/ints.c335
1 files changed, 335 insertions, 0 deletions
diff --git a/arch/m68knommu/platform/68360/ints.c b/arch/m68knommu/platform/68360/ints.c
new file mode 100644
index 000000000000..ba184db1651b
--- /dev/null
+++ b/arch/m68knommu/platform/68360/ints.c
@@ -0,0 +1,335 @@
+/*
+ * linux/arch/$(ARCH)/platform/$(PLATFORM)/ints.c
+ *
+ * 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.
+ *
+ * Copyright (c) 2000 Michael Leslie <mleslie@lineo.com>
+ * Copyright (c) 1996 Roman Zippel
+ * Copyright (c) 1999 D. Jeff Dionne <jeff@uclinux.org>
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/kernel_stat.h>
+#include <linux/errno.h>
+
+#include <asm/system.h>
+#include <asm/irq.h>
+#include <asm/traps.h>
+#include <asm/io.h>
+#include <asm/machdep.h>
+#include <asm/setup.h>
+#include <asm/m68360.h>
+
+/* from quicc/commproc.c: */
+extern QUICC *pquicc;
+extern void cpm_interrupt_init(void);
+
+#define INTERNAL_IRQS (96)
+
+/* assembler routines */
+asmlinkage void system_call(void);
+asmlinkage void buserr(void);
+asmlinkage void trap(void);
+asmlinkage irqreturn_t bad_interrupt(void);
+asmlinkage irqreturn_t inthandler(void);
+
+extern void *_ramvec[];
+
+/* The number of spurious interrupts */
+volatile unsigned int num_spurious;
+unsigned int local_irq_count[NR_CPUS];
+
+/* irq node variables for the 32 (potential) on chip sources */
+static irq_node_t int_irq_list[INTERNAL_IRQS];
+
+static short int_irq_ablecount[INTERNAL_IRQS];
+
+/*
+ * This function should be called during kernel startup to initialize
+ * IRQ handling routines.
+ */
+
+void init_IRQ(void)
+{
+ int i;
+ int vba = (CPM_VECTOR_BASE<<4);
+
+ /* set up the vectors */
+ _ramvec[2] = buserr;
+ _ramvec[3] = trap;
+ _ramvec[4] = trap;
+ _ramvec[5] = trap;
+ _ramvec[6] = trap;
+ _ramvec[7] = trap;
+ _ramvec[8] = trap;
+ _ramvec[9] = trap;
+ _ramvec[10] = trap;
+ _ramvec[11] = trap;
+ _ramvec[12] = trap;
+ _ramvec[13] = trap;
+ _ramvec[14] = trap;
+ _ramvec[15] = trap;
+
+ _ramvec[32] = system_call;
+ _ramvec[33] = trap;
+
+
+ cpm_interrupt_init();
+
+ /* set up CICR for vector base address and irq level */
+ /* irl = 4, hp = 1f - see MC68360UM p 7-377 */
+ pquicc->intr_cicr = 0x00e49f00 | vba;
+
+ /* CPM interrupt vectors: (p 7-376) */
+ _ramvec[vba+CPMVEC_ERROR] = bad_interrupt; /* Error */
+ _ramvec[vba+CPMVEC_PIO_PC11] = inthandler; /* pio - pc11 */
+ _ramvec[vba+CPMVEC_PIO_PC10] = inthandler; /* pio - pc10 */
+ _ramvec[vba+CPMVEC_SMC2] = inthandler; /* smc2/pip */
+ _ramvec[vba+CPMVEC_SMC1] = inthandler; /* smc1 */
+ _ramvec[vba+CPMVEC_SPI] = inthandler; /* spi */
+ _ramvec[vba+CPMVEC_PIO_PC9] = inthandler; /* pio - pc9 */
+ _ramvec[vba+CPMVEC_TIMER4] = inthandler; /* timer 4 */
+ _ramvec[vba+CPMVEC_RESERVED1] = inthandler; /* reserved */
+ _ramvec[vba+CPMVEC_PIO_PC8] = inthandler; /* pio - pc8 */
+ _ramvec[vba+CPMVEC_PIO_PC7] = inthandler; /* pio - pc7 */
+ _ramvec[vba+CPMVEC_PIO_PC6] = inthandler; /* pio - pc6 */
+ _ramvec[vba+CPMVEC_TIMER3] = inthandler; /* timer 3 */
+ _ramvec[vba+CPMVEC_RISCTIMER] = inthandler; /* reserved */
+ _ramvec[vba+CPMVEC_PIO_PC5] = inthandler; /* pio - pc5 */
+ _ramvec[vba+CPMVEC_PIO_PC4] = inthandler; /* pio - pc4 */
+ _ramvec[vba+CPMVEC_RESERVED2] = inthandler; /* reserved */
+ _ramvec[vba+CPMVEC_RISCTIMER] = inthandler; /* timer table */
+ _ramvec[vba+CPMVEC_TIMER2] = inthandler; /* timer 2 */
+ _ramvec[vba+CPMVEC_RESERVED3] = inthandler; /* reserved */
+ _ramvec[vba+CPMVEC_IDMA2] = inthandler; /* idma 2 */
+ _ramvec[vba+CPMVEC_IDMA1] = inthandler; /* idma 1 */
+ _ramvec[vba+CPMVEC_SDMA_CB_ERR] = inthandler; /* sdma channel bus error */
+ _ramvec[vba+CPMVEC_PIO_PC3] = inthandler; /* pio - pc3 */
+ _ramvec[vba+CPMVEC_PIO_PC2] = inthandler; /* pio - pc2 */
+ /* _ramvec[vba+CPMVEC_TIMER1] = cpm_isr_timer1; */ /* timer 1 */
+ _ramvec[vba+CPMVEC_TIMER1] = inthandler; /* timer 1 */
+ _ramvec[vba+CPMVEC_PIO_PC1] = inthandler; /* pio - pc1 */
+ _ramvec[vba+CPMVEC_SCC4] = inthandler; /* scc 4 */
+ _ramvec[vba+CPMVEC_SCC3] = inthandler; /* scc 3 */
+ _ramvec[vba+CPMVEC_SCC2] = inthandler; /* scc 2 */
+ _ramvec[vba+CPMVEC_SCC1] = inthandler; /* scc 1 */
+ _ramvec[vba+CPMVEC_PIO_PC0] = inthandler; /* pio - pc0 */
+
+
+ /* turn off all CPM interrupts */
+ pquicc->intr_cimr = 0x00000000;
+
+ /* initialize handlers */
+ for (i = 0; i < INTERNAL_IRQS; i++) {
+ int_irq_list[i].handler = NULL;
+ int_irq_list[i].flags = IRQ_FLG_STD;
+ int_irq_list[i].dev_id = NULL;
+ int_irq_list[i].devname = NULL;
+ }
+}
+
+#if 0
+void M68360_insert_irq(irq_node_t **list, irq_node_t *node)
+{
+ unsigned long flags;
+ irq_node_t *cur;
+
+ if (!node->dev_id)
+ printk(KERN_INFO "%s: Warning: dev_id of %s is zero\n",
+ __FUNCTION__, node->devname);
+
+ local_irq_save(flags);
+
+ cur = *list;
+
+ while (cur) {
+ list = &cur->next;
+ cur = cur->next;
+ }
+
+ node->next = cur;
+ *list = node;
+
+ local_irq_restore(flags);
+}
+
+void M68360_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 (KERN_INFO "%s: tried to remove invalid irq\n", __FUNCTION__);
+}
+#endif
+
+int request_irq(
+ unsigned int irq,
+ irqreturn_t (*handler)(int, void *, struct pt_regs *),
+ unsigned long flags,
+ const char *devname,
+ void *dev_id)
+{
+ int mask = (1<<irq);
+
+ irq += (CPM_VECTOR_BASE<<4);
+
+ if (irq >= INTERNAL_IRQS) {
+ printk (KERN_ERR "%s: Unknown IRQ %d from %s\n", __FUNCTION__, irq, devname);
+ return -ENXIO;
+ }
+
+ if (!(int_irq_list[irq].flags & IRQ_FLG_STD)) {
+ if (int_irq_list[irq].flags & IRQ_FLG_LOCK) {
+ printk(KERN_ERR "%s: IRQ %d from %s is not replaceable\n",
+ __FUNCTION__, irq, int_irq_list[irq].devname);
+ return -EBUSY;
+ }
+ if (flags & IRQ_FLG_REPLACE) {
+ printk(KERN_ERR "%s: %s can't replace IRQ %d from %s\n",
+ __FUNCTION__, devname, irq, int_irq_list[irq].devname);
+ return -EBUSY;
+ }
+ }
+ int_irq_list[irq].handler = handler;
+ int_irq_list[irq].flags = flags;
+ int_irq_list[irq].dev_id = dev_id;
+ int_irq_list[irq].devname = devname;
+
+ /* enable in the CIMR */
+ if (!int_irq_ablecount[irq])
+ pquicc->intr_cimr |= mask;
+ /* *(volatile unsigned long *)0xfffff304 &= ~(1<<irq); */
+
+ return 0;
+}
+
+EXPORT_SYMBOL(request_irq);
+
+void free_irq(unsigned int irq, void *dev_id)
+{
+ if (irq >= INTERNAL_IRQS) {
+ printk (KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
+ return;
+ }
+
+ if (int_irq_list[irq].dev_id != dev_id)
+ printk(KERN_INFO "%s: removing probably wrong IRQ %d from %s\n",
+ __FUNCTION__, irq, int_irq_list[irq].devname);
+ int_irq_list[irq].handler = NULL;
+ int_irq_list[irq].flags = IRQ_FLG_STD;
+ int_irq_list[irq].dev_id = NULL;
+ int_irq_list[irq].devname = NULL;
+
+ *(volatile unsigned long *)0xfffff304 |= 1<<irq;
+}
+
+EXPORT_SYMBOL(free_irq);
+
+#if 0
+/*
+ * 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.
+ * int_(enable|disable)_irq calls may also be nested.
+ */
+void M68360_enable_irq(unsigned int irq)
+{
+ if (irq >= INTERNAL_IRQS) {
+ printk(KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
+ return;
+ }
+
+ if (--int_irq_ablecount[irq])
+ return;
+
+ /* enable the interrupt */
+ *(volatile unsigned long *)0xfffff304 &= ~(1<<irq);
+}
+
+void M68360_disable_irq(unsigned int irq)
+{
+ if (irq >= INTERNAL_IRQS) {
+ printk(KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
+ return;
+ }
+
+ if (int_irq_ablecount[irq]++)
+ return;
+
+ /* disable the interrupt */
+ *(volatile unsigned long *)0xfffff304 |= 1<<irq;
+}
+#endif
+
+int show_interrupts(struct seq_file *p, void *v)
+{
+ int i = *(loff_t *) v;
+
+ if (i < NR_IRQS) {
+ if (int_irq_list[i].devname) {
+ seq_printf(p, "%3d: %10u ", i, kstat_cpu(0).irqs[i]);
+ if (int_irq_list[i].flags & IRQ_FLG_LOCK)
+ seq_printf(p, "L ");
+ else
+ seq_printf(p, " ");
+ seq_printf(p, "%s\n", int_irq_list[i].devname);
+ }
+ }
+ if (i == NR_IRQS)
+ seq_printf(p, " : %10u spurious\n", num_spurious);
+
+ return 0;
+}
+
+/* The 68k family did not have a good way to determine the source
+ * of interrupts until later in the family. The EC000 core does
+ * not provide the vector number on the stack, we vector everything
+ * into one vector and look in the blasted mask register...
+ * This code is designed to be fast, almost constant time, not clean!
+ */
+void process_int(int vec, struct pt_regs *fp)
+{
+ int irq;
+ int mask;
+
+ /* unsigned long pend = *(volatile unsigned long *)0xfffff30c; */
+
+ /* irq = vec + (CPM_VECTOR_BASE<<4); */
+ irq = vec;
+
+ /* unsigned long pend = *(volatile unsigned long *)pquicc->intr_cipr; */
+
+ /* Bugger all that weirdness. For the moment, I seem to know where I came from;
+ * vec is passed from a specific ISR, so I'll use it. */
+
+ if (int_irq_list[irq].handler) {
+ int_irq_list[irq].handler(irq , int_irq_list[irq].dev_id, fp);
+ kstat_cpu(0).irqs[irq]++;
+ pquicc->intr_cisr = (1 << vec); /* indicate that irq has been serviced */
+ } else {
+ printk(KERN_ERR "unregistered interrupt %d!\nTurning it off in the CIMR...\n", irq);
+ /* *(volatile unsigned long *)0xfffff304 |= mask; */
+ pquicc->intr_cimr &= ~(1 << vec);
+ num_spurious += 1;
+ }
+ return(IRQ_HANDLED);
+}
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