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-rw-r--r--arch/h8300/platform/h8s/ints.c303
1 files changed, 303 insertions, 0 deletions
diff --git a/arch/h8300/platform/h8s/ints.c b/arch/h8300/platform/h8s/ints.c
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+/*
+ * linux/arch/h8300/platform/h8s/ints.c
+ *
+ * Yoshinori Sato <ysato@users.sourceforge.jp>
+ *
+ * Based on 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 1996 Roman Zippel
+ * Copyright 1999 D. Jeff Dionne <jeff@rt-control.com>
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/kernel_stat.h>
+#include <linux/seq_file.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/random.h>
+#include <linux/hardirq.h>
+
+#include <asm/system.h>
+#include <asm/irq.h>
+#include <asm/traps.h>
+#include <asm/io.h>
+#include <asm/setup.h>
+#include <asm/gpio.h>
+#include <asm/regs267x.h>
+#include <asm/errno.h>
+
+/*
+ * This structure has only 4 elements for speed reasons
+ */
+typedef struct irq_handler {
+ irqreturn_t (*handler)(int, void *, struct pt_regs *);
+ int flags;
+ int count;
+ void *dev_id;
+ const char *devname;
+} irq_handler_t;
+
+static irq_handler_t *irq_list[NR_IRQS];
+
+/* IRQ pin assignment */
+struct irq_pins {
+ unsigned char port_no;
+ unsigned char bit_no;
+};
+/* ISTR = 0 */
+const static struct irq_pins irq_assign_table0[16]={
+ {H8300_GPIO_P5,H8300_GPIO_B0},{H8300_GPIO_P5,H8300_GPIO_B1},
+ {H8300_GPIO_P5,H8300_GPIO_B2},{H8300_GPIO_P5,H8300_GPIO_B3},
+ {H8300_GPIO_P5,H8300_GPIO_B4},{H8300_GPIO_P5,H8300_GPIO_B5},
+ {H8300_GPIO_P5,H8300_GPIO_B6},{H8300_GPIO_P5,H8300_GPIO_B7},
+ {H8300_GPIO_P6,H8300_GPIO_B0},{H8300_GPIO_P6,H8300_GPIO_B1},
+ {H8300_GPIO_P6,H8300_GPIO_B2},{H8300_GPIO_P6,H8300_GPIO_B3},
+ {H8300_GPIO_P6,H8300_GPIO_B4},{H8300_GPIO_P6,H8300_GPIO_B5},
+ {H8300_GPIO_PF,H8300_GPIO_B1},{H8300_GPIO_PF,H8300_GPIO_B2},
+};
+/* ISTR = 1 */
+const static struct irq_pins irq_assign_table1[16]={
+ {H8300_GPIO_P8,H8300_GPIO_B0},{H8300_GPIO_P8,H8300_GPIO_B1},
+ {H8300_GPIO_P8,H8300_GPIO_B2},{H8300_GPIO_P8,H8300_GPIO_B3},
+ {H8300_GPIO_P8,H8300_GPIO_B4},{H8300_GPIO_P8,H8300_GPIO_B5},
+ {H8300_GPIO_PH,H8300_GPIO_B2},{H8300_GPIO_PH,H8300_GPIO_B3},
+ {H8300_GPIO_P2,H8300_GPIO_B0},{H8300_GPIO_P2,H8300_GPIO_B1},
+ {H8300_GPIO_P2,H8300_GPIO_B2},{H8300_GPIO_P2,H8300_GPIO_B3},
+ {H8300_GPIO_P2,H8300_GPIO_B4},{H8300_GPIO_P2,H8300_GPIO_B5},
+ {H8300_GPIO_P2,H8300_GPIO_B6},{H8300_GPIO_P2,H8300_GPIO_B7},
+};
+
+static short use_kmalloc = 0;
+
+extern unsigned long *interrupt_redirect_table;
+
+#define CPU_VECTOR ((unsigned long *)0x000000)
+#define ADDR_MASK (0xffffff)
+
+static inline unsigned long *get_vector_address(void)
+{
+ volatile unsigned long *rom_vector = CPU_VECTOR;
+ unsigned long base,tmp;
+ int vec_no;
+
+ base = rom_vector[EXT_IRQ0] & ADDR_MASK;
+
+ /* check romvector format */
+ for (vec_no = EXT_IRQ1; vec_no <= EXT_IRQ15; vec_no++) {
+ if ((base+(vec_no - EXT_IRQ0)*4) != (rom_vector[vec_no] & ADDR_MASK))
+ return NULL;
+ }
+
+ /* ramvector base address */
+ base -= EXT_IRQ0*4;
+
+ /* writerble check */
+ tmp = ~(*(unsigned long *)base);
+ (*(unsigned long *)base) = tmp;
+ if ((*(unsigned long *)base) != tmp)
+ return NULL;
+ return (unsigned long *)base;
+}
+
+void __init init_IRQ(void)
+{
+#if defined(CONFIG_RAMKERNEL)
+ int i;
+ unsigned long *ramvec,*ramvec_p;
+ unsigned long break_vec;
+
+ ramvec = get_vector_address();
+ if (ramvec == NULL)
+ panic("interrupt vector serup failed.");
+ else
+ printk("virtual vector at 0x%08lx\n",(unsigned long)ramvec);
+
+#if defined(CONFIG_GDB_DEBUG)
+ /* save orignal break vector */
+ break_vec = ramvec[TRAP3_VEC];
+#else
+ break_vec = VECTOR(trace_break);
+#endif
+
+ /* create redirect table */
+ for (ramvec_p = ramvec, i = 0; i < NR_IRQS; i++)
+ *ramvec_p++ = REDIRECT(interrupt_entry);
+
+ /* set special vector */
+ ramvec[TRAP0_VEC] = VECTOR(system_call);
+ ramvec[TRAP3_VEC] = break_vec;
+ interrupt_redirect_table = ramvec;
+#ifdef DUMP_VECTOR
+ ramvec_p = ramvec;
+ for (i = 0; i < NR_IRQS; i++) {
+ if ((i % 8) == 0)
+ printk("\n%p: ",ramvec_p);
+ printk("%p ",*ramvec_p);
+ ramvec_p++;
+ }
+ printk("\n");
+#endif
+#endif
+}
+
+int request_irq(unsigned int irq,
+ irqreturn_t (*handler)(int, void *, struct pt_regs *),
+ unsigned long flags, const char *devname, void *dev_id)
+{
+ unsigned short ptn = 1 << (irq - EXT_IRQ0);
+ irq_handler_t *irq_handle;
+ if (irq < 0 || irq >= NR_IRQS) {
+ printk("Incorrect IRQ %d from %s\n", irq, devname);
+ return -EINVAL;
+ }
+ if (irq_list[irq])
+ return -EBUSY; /* already used */
+ if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
+ /* initialize IRQ pin */
+ unsigned int port_no,bit_no;
+ if (*(volatile unsigned short *)ITSR & ptn) {
+ port_no = irq_assign_table1[irq - EXT_IRQ0].port_no;
+ bit_no = irq_assign_table1[irq - EXT_IRQ0].bit_no;
+ } else {
+ port_no = irq_assign_table0[irq - EXT_IRQ0].port_no;
+ bit_no = irq_assign_table0[irq - EXT_IRQ0].bit_no;
+ }
+ if (H8300_GPIO_RESERVE(port_no, bit_no) == 0)
+ return -EBUSY; /* pin already use */
+ H8300_GPIO_DDR(port_no, bit_no, H8300_GPIO_INPUT);
+ *(volatile unsigned short *)ISR &= ~ptn; /* ISR clear */
+ }
+
+ if (use_kmalloc)
+ irq_handle = (irq_handler_t *)kmalloc(sizeof(irq_handler_t), GFP_ATOMIC);
+ else {
+ /* use bootmem allocater */
+ irq_handle = (irq_handler_t *)alloc_bootmem(sizeof(irq_handler_t));
+ irq_handle = (irq_handler_t *)((unsigned long)irq_handle | 0x80000000);
+ }
+
+ if (irq_handle == NULL)
+ return -ENOMEM;
+
+ irq_handle->handler = handler;
+ irq_handle->flags = flags;
+ irq_handle->count = 0;
+ irq_handle->dev_id = dev_id;
+ irq_handle->devname = devname;
+ irq_list[irq] = irq_handle;
+ if (irq_handle->flags & SA_SAMPLE_RANDOM)
+ rand_initialize_irq(irq);
+
+ /* enable interrupt */
+ /* compatible i386 */
+ if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15)
+ *(volatile unsigned short *)IER |= ptn;
+ return 0;
+}
+
+EXPORT_SYMBOL(request_irq);
+
+void free_irq(unsigned int irq, void *dev_id)
+{
+ if (irq >= NR_IRQS)
+ return;
+ if (irq_list[irq]->dev_id != dev_id)
+ printk("%s: Removing probably wrong IRQ %d from %s\n",
+ __FUNCTION__, irq, irq_list[irq]->devname);
+ if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
+ /* disable interrupt & release IRQ pin */
+ unsigned short port_no,bit_no;
+ *(volatile unsigned short *)ISR &= ~(1 << (irq - EXT_IRQ0));
+ *(volatile unsigned short *)IER |= 1 << (irq - EXT_IRQ0);
+ if (*(volatile unsigned short *)ITSR & (1 << (irq - EXT_IRQ0))) {
+ port_no = irq_assign_table1[irq - EXT_IRQ0].port_no;
+ bit_no = irq_assign_table1[irq - EXT_IRQ0].bit_no;
+ } else {
+ port_no = irq_assign_table0[irq - EXT_IRQ0].port_no;
+ bit_no = irq_assign_table0[irq - EXT_IRQ0].bit_no;
+ }
+ H8300_GPIO_FREE(port_no, bit_no);
+ }
+ if (((unsigned long)irq_list[irq] & 0x80000000) == 0) {
+ kfree(irq_list[irq]);
+ irq_list[irq] = NULL;
+ }
+}
+
+EXPORT_SYMBOL(free_irq);
+
+unsigned long probe_irq_on (void)
+{
+ return 0;
+}
+
+EXPORT_SYMBOL(probe_irq_on);
+
+int probe_irq_off (unsigned long irqs)
+{
+ return 0;
+}
+
+EXPORT_SYMBOL(probe_irq_off);
+
+void enable_irq(unsigned int irq)
+{
+ if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15)
+ *(volatile unsigned short *)IER |= 1 << (irq - EXT_IRQ0);
+}
+
+void disable_irq(unsigned int irq)
+{
+ if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15)
+ *(volatile unsigned short *)IER &= ~(1 << (irq - EXT_IRQ0));
+}
+
+asmlinkage void process_int(unsigned long vec, struct pt_regs *fp)
+{
+ irq_enter();
+ /* ISR clear */
+ /* compatible i386 */
+ if (vec >= EXT_IRQ0 && vec <= EXT_IRQ15)
+ *(volatile unsigned short *)ISR &= ~(1 << (vec - EXT_IRQ0));
+ if (vec < NR_IRQS) {
+ if (irq_list[vec]) {
+ irq_list[vec]->handler(vec, irq_list[vec]->dev_id, fp);
+ irq_list[vec]->count++;
+ if (irq_list[vec]->flags & SA_SAMPLE_RANDOM)
+ add_interrupt_randomness(vec);
+ }
+ } else {
+ BUG();
+ }
+ irq_exit();
+}
+
+int show_interrupts(struct seq_file *p, void *v)
+{
+ int i = *(loff_t *) v;
+
+ if ((i < NR_IRQS) && (irq_list[i] !=NULL)) {
+ seq_printf(p, "%3d: %10u ",i,irq_list[i]->count);
+ seq_printf(p, "%s\n", irq_list[i]->devname);
+ }
+
+ return 0;
+}
+
+void init_irq_proc(void)
+{
+}
+
+static int __init enable_kmalloc(void)
+{
+ use_kmalloc = 1;
+ return 0;
+}
+core_initcall(enable_kmalloc);