irq.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:6k
- /*
- * arch/mips/ddb5074/irq.c -- NEC DDB Vrc-5074 interrupt routines
- *
- * Copyright (C) 2000 Geert Uytterhoeven <geert@sonycom.com>
- * Sony Software Development Center Europe (SDCE), Brussels
- */
- #include <linux/config.h>
- #include <linux/init.h>
- #include <linux/signal.h>
- #include <linux/sched.h>
- #include <linux/types.h>
- #include <linux/interrupt.h>
- #include <linux/ioport.h>
- #include <asm/io.h>
- #include <asm/irq.h>
- #include <asm/ptrace.h>
- #include <asm/nile4.h>
- #include <asm/ddb5074.h>
- extern void __init i8259_init(void);
- extern void i8259_disable_irq(unsigned int irq_nr);
- extern void i8259_enable_irq(unsigned int irq_nr);
- extern asmlinkage void ddbIRQ(void);
- extern asmlinkage void i8259_do_irq(int irq, struct pt_regs *regs);
- extern asmlinkage void do_IRQ(int irq, struct pt_regs *regs);
- void no_action(int cpl, void *dev_id, struct pt_regs *regs)
- {
- }
- #define M1543_PNP_CONFIG 0x03f0 /* PnP Config Port */
- #define M1543_PNP_INDEX 0x03f0 /* PnP Index Port */
- #define M1543_PNP_DATA 0x03f1 /* PnP Data Port */
- #define M1543_PNP_ALT_CONFIG 0x0370 /* Alternative PnP Config Port */
- #define M1543_PNP_ALT_INDEX 0x0370 /* Alternative PnP Index Port */
- #define M1543_PNP_ALT_DATA 0x0371 /* Alternative PnP Data Port */
- #define M1543_INT1_MASTER_CTRL 0x0020 /* INT_1 (master) Control Register */
- #define M1543_INT1_MASTER_MASK 0x0021 /* INT_1 (master) Mask Register */
- #define M1543_INT1_SLAVE_CTRL 0x00a0 /* INT_1 (slave) Control Register */
- #define M1543_INT1_SLAVE_MASK 0x00a1 /* INT_1 (slave) Mask Register */
- #define M1543_INT1_MASTER_ELCR 0x04d0 /* INT_1 (master) Edge/Level Control */
- #define M1543_INT1_SLAVE_ELCR 0x04d1 /* INT_1 (slave) Edge/Level Control */
- static void m1543_irq_setup(void)
- {
- /*
- * The ALI M1543 has 13 interrupt inputs, IRQ1..IRQ13. Not all
- * the possible IO sources in the M1543 are in use by us. We will
- * use the following mapping:
- *
- * IRQ1 - keyboard (default set by M1543)
- * IRQ3 - reserved for UART B (default set by M1543) (note that
- * the schematics for the DDB Vrc-5074 board seem to
- * indicate that IRQ3 is connected to the DS1386
- * watchdog timer interrupt output so we might have
- * a conflict)
- * IRQ4 - reserved for UART A (default set by M1543)
- * IRQ5 - parallel (default set by M1543)
- * IRQ8 - DS1386 time of day (RTC) interrupt
- * IRQ12 - mouse
- */
- /*
- * Assing mouse interrupt to IRQ12
- */
- /* Enter configuration mode */
- outb(0x51, M1543_PNP_CONFIG);
- outb(0x23, M1543_PNP_CONFIG);
- /* Select logical device 7 (Keyboard) */
- outb(0x07, M1543_PNP_INDEX);
- outb(0x07, M1543_PNP_DATA);
- /* Select IRQ12 */
- outb(0x72, M1543_PNP_INDEX);
- outb(0x0c, M1543_PNP_DATA);
- /* Leave configration mode */
- outb(0xbb, M1543_PNP_CONFIG);
- /* Initialize the 8259 PIC in the M1543 */
- i8259_init();
- /* Enable the interrupt cascade */
- nile4_enable_irq(NILE4_INT_INTE);
- request_region(M1543_PNP_CONFIG, 2, "M1543 config");
- request_region(M1543_INT1_MASTER_ELCR, 2, "pic ELCR");
- }
- static void nile4_irq_setup(void)
- {
- int i;
- /* Map all interrupts to CPU int #0 */
- nile4_map_irq_all(0);
- /* PCI INTA#-E# must be level triggered */
- nile4_set_pci_irq_level_or_edge(0, 1);
- nile4_set_pci_irq_level_or_edge(1, 1);
- nile4_set_pci_irq_level_or_edge(2, 1);
- nile4_set_pci_irq_level_or_edge(3, 1);
- nile4_set_pci_irq_level_or_edge(4, 1);
- /* PCI INTA#-D# must be active low, INTE# must be active high */
- nile4_set_pci_irq_polarity(0, 0);
- nile4_set_pci_irq_polarity(1, 0);
- nile4_set_pci_irq_polarity(2, 0);
- nile4_set_pci_irq_polarity(3, 0);
- nile4_set_pci_irq_polarity(4, 1);
- for (i = 0; i < 16; i++)
- nile4_clear_irq(i);
- /* Enable CPU int #0 */
- nile4_enable_irq_output(0);
- request_mem_region(NILE4_BASE, NILE4_SIZE, "Nile 4");
- }
- /*
- * IRQ2 is cascade interrupt to second interrupt controller
- */
- static struct irqaction irq2 = { no_action, 0, 0, "cascade", NULL, NULL };
- void disable_irq(unsigned int irq_nr)
- {
- if (is_i8259_irq(irq_nr))
- i8259_disable_irq(irq_nr);
- else
- nile4_disable_irq(irq_to_nile4(irq_nr));
- }
- void enable_irq(unsigned int irq_nr)
- {
- if (is_i8259_irq(irq_nr))
- i8259_enable_irq(irq_nr);
- else
- nile4_enable_irq(irq_to_nile4(irq_nr));
- }
- int table[16] = { 0, };
- void ddb_local0_irqdispatch(struct pt_regs *regs)
- {
- u32 mask;
- int nile4_irq;
- #if 1
- volatile static int nesting = 0;
- if (nesting++ == 0)
- ddb5074_led_d3(1);
- ddb5074_led_hex(nesting < 16 ? nesting : 15);
- #endif
- mask = nile4_get_irq_stat(0);
- nile4_clear_irq_mask(mask);
- /* Handle the timer interrupt first */
- if (mask & (1 << NILE4_INT_GPT)) {
- nile4_disable_irq(NILE4_INT_GPT);
- do_IRQ(nile4_to_irq(NILE4_INT_GPT), regs);
- nile4_enable_irq(NILE4_INT_GPT);
- mask &= ~(1 << NILE4_INT_GPT);
- }
- for (nile4_irq = 0; mask; nile4_irq++, mask >>= 1)
- if (mask & 1) {
- nile4_disable_irq(nile4_irq);
- if (nile4_irq == NILE4_INT_INTE) {
- int i8259_irq = nile4_i8259_iack();
- i8259_do_irq(i8259_irq, regs);
- } else
- do_IRQ(nile4_to_irq(nile4_irq), regs);
- nile4_enable_irq(nile4_irq);
- }
- #if 1
- if (--nesting == 0)
- ddb5074_led_d3(0);
- ddb5074_led_hex(nesting < 16 ? nesting : 15);
- #endif
- }
- void ddb_local1_irqdispatch(void)
- {
- printk("ddb_local1_irqdispatch calledn");
- }
- void ddb_buserror_irq(void)
- {
- printk("ddb_buserror_irq calledn");
- }
- void ddb_8254timer_irq(void)
- {
- printk("ddb_8254timer_irq calledn");
- }
- void __init ddb_irq_setup(void)
- {
- #ifdef CONFIG_REMOTE_DEBUG
- if (remote_debug)
- set_debug_traps();
- breakpoint(); /* you may move this line to whereever you want :-) */
- #endif
- request_region(0x20, 0x20, "pic1");
- request_region(0xa0, 0x20, "pic2");
- i8259_setup_irq(2, &irq2);
- nile4_irq_setup();
- m1543_irq_setup();
- set_except_vector(0, ddbIRQ);
- }