irq.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:11k
- /*
- * BRIEF MODULE DESCRIPTION
- * Au1000 interrupt routines.
- *
- * Copyright 2001 MontaVista Software Inc.
- * Author: MontaVista Software, Inc.
- * ppopov@mvista.com or source@mvista.com
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- #include <linux/errno.h>
- #include <linux/init.h>
- #include <linux/kernel_stat.h>
- #include <linux/module.h>
- #include <linux/signal.h>
- #include <linux/sched.h>
- #include <linux/types.h>
- #include <linux/interrupt.h>
- #include <linux/ioport.h>
- #include <linux/timex.h>
- #include <linux/slab.h>
- #include <linux/random.h>
- #include <linux/delay.h>
- #include <asm/bitops.h>
- #include <asm/bootinfo.h>
- #include <asm/io.h>
- #include <asm/mipsregs.h>
- #include <asm/system.h>
- #include <asm/au1000.h>
- #define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5)
- #undef DEBUG_IRQ
- #ifdef DEBUG_IRQ
- /* note: prints function name for you */
- #define DPRINTK(fmt, args...) printk("%s: " fmt, __FUNCTION__ , ## args)
- #else
- #define DPRINTK(fmt, args...)
- #endif
- #define EXT_INTC0_REQ0 2 /* IP 2 */
- #define EXT_INTC0_REQ1 3 /* IP 3 */
- #define EXT_INTC1_REQ0 4 /* IP 4 */
- #define EXT_INTC1_REQ1 5 /* IP 5 */
- #define MIPS_TIMER_IP 7 /* IP 7 */
- #ifdef CONFIG_REMOTE_DEBUG
- extern void breakpoint(void);
- #endif
- extern asmlinkage void au1000_IRQ(void);
- extern void set_debug_traps(void);
- extern irq_cpustat_t irq_stat [];
- extern irq_desc_t irq_desc[NR_IRQS];
- unsigned int local_bh_count[NR_CPUS];
- unsigned int local_irq_count[NR_CPUS];
- static void setup_local_irq(unsigned int irq, int type, int int_req);
- static unsigned int startup_irq(unsigned int irq);
- static void end_irq(unsigned int irq_nr);
- static inline void mask_and_ack_level_irq(unsigned int irq_nr);
- static inline void mask_and_ack_rise_edge_irq(unsigned int irq_nr);
- static inline void mask_and_ack_fall_edge_irq(unsigned int irq_nr);
- static inline void local_enable_irq(unsigned int irq_nr);
- static inline void local_disable_irq(unsigned int irq_nr);
- unsigned long spurious_interrupts;
- extern unsigned int do_IRQ(int irq, struct pt_regs *regs);
- extern void __init init_generic_irq(void);
- static inline void sync(void)
- {
- __asm volatile ("sync");
- }
- /* Function for careful CP0 interrupt mask access */
- static inline void modify_cp0_intmask(unsigned clr_mask, unsigned set_mask)
- {
- unsigned long status = read_32bit_cp0_register(CP0_STATUS);
- status &= ~((clr_mask & 0xFF) << 8);
- status |= (set_mask & 0xFF) << 8;
- write_32bit_cp0_register(CP0_STATUS, status);
- }
- static inline void mask_cpu_irq_input(unsigned int irq_nr)
- {
- modify_cp0_intmask(irq_nr, 0);
- }
- static inline void unmask_cpu_irq_input(unsigned int irq_nr)
- {
- modify_cp0_intmask(0, irq_nr);
- }
- static void disable_cpu_irq_input(unsigned int irq_nr)
- {
- unsigned long flags;
- save_and_cli(flags);
- mask_cpu_irq_input(irq_nr);
- restore_flags(flags);
- }
- static void enable_cpu_irq_input(unsigned int irq_nr)
- {
- unsigned long flags;
- save_and_cli(flags);
- unmask_cpu_irq_input(irq_nr);
- restore_flags(flags);
- }
- static void setup_local_irq(unsigned int irq_nr, int type, int int_req)
- {
- /* Config2[n], Config1[n], Config0[n] */
- if (irq_nr > AU1000_LAST_INTC0_INT) {
- switch (type) {
- case INTC_INT_RISE_EDGE: /* 0:0:1 */
- outl(1<<irq_nr,INTC1_CONFIG2_CLEAR);
- outl(1<<irq_nr, INTC1_CONFIG1_CLEAR);
- outl(1<<irq_nr, INTC1_CONFIG0_SET);
- break;
- case INTC_INT_FALL_EDGE: /* 0:1:0 */
- outl(1<<irq_nr, INTC1_CONFIG2_CLEAR);
- outl(1<<irq_nr, INTC1_CONFIG1_SET);
- outl(1<<irq_nr, INTC1_CONFIG0_CLEAR);
- break;
- case INTC_INT_HIGH_LEVEL: /* 1:0:1 */
- outl(1<<irq_nr, INTC1_CONFIG2_SET);
- outl(1<<irq_nr, INTC1_CONFIG1_CLEAR);
- outl(1<<irq_nr, INTC1_CONFIG0_SET);
- break;
- case INTC_INT_LOW_LEVEL: /* 1:1:0 */
- outl(1<<irq_nr, INTC1_CONFIG2_SET);
- outl(1<<irq_nr, INTC1_CONFIG1_SET);
- outl(1<<irq_nr, INTC1_CONFIG0_CLEAR);
- break;
- case INTC_INT_DISABLED: /* 0:0:0 */
- outl(1<<irq_nr, INTC1_CONFIG0_CLEAR);
- outl(1<<irq_nr, INTC1_CONFIG1_CLEAR);
- outl(1<<irq_nr, INTC1_CONFIG2_CLEAR);
- break;
- default: /* disable the interrupt */
- printk("unexpected int type %d (irq %d)n", type, irq_nr);
- outl(1<<irq_nr, INTC1_CONFIG0_CLEAR);
- outl(1<<irq_nr, INTC1_CONFIG1_CLEAR);
- outl(1<<irq_nr, INTC1_CONFIG2_CLEAR);
- return;
- }
- if (int_req) /* assign to interrupt request 1 */
- outl(1<<irq_nr, INTC1_ASSIGN_REQ_CLEAR);
- else /* assign to interrupt request 0 */
- outl(1<<irq_nr, INTC1_ASSIGN_REQ_SET);
- outl(1<<irq_nr, INTC1_SOURCE_SET);
- outl(1<<irq_nr, INTC1_MASK_CLEAR);
- }
- else {
- switch (type) {
- case INTC_INT_RISE_EDGE: /* 0:0:1 */
- outl(1<<irq_nr,INTC0_CONFIG2_CLEAR);
- outl(1<<irq_nr, INTC0_CONFIG1_CLEAR);
- outl(1<<irq_nr, INTC0_CONFIG0_SET);
- break;
- case INTC_INT_FALL_EDGE: /* 0:1:0 */
- outl(1<<irq_nr, INTC0_CONFIG2_CLEAR);
- outl(1<<irq_nr, INTC0_CONFIG1_SET);
- outl(1<<irq_nr, INTC0_CONFIG0_CLEAR);
- break;
- case INTC_INT_HIGH_LEVEL: /* 1:0:1 */
- outl(1<<irq_nr, INTC0_CONFIG2_SET);
- outl(1<<irq_nr, INTC0_CONFIG1_CLEAR);
- outl(1<<irq_nr, INTC0_CONFIG0_SET);
- break;
- case INTC_INT_LOW_LEVEL: /* 1:1:0 */
- outl(1<<irq_nr, INTC0_CONFIG2_SET);
- outl(1<<irq_nr, INTC0_CONFIG1_SET);
- outl(1<<irq_nr, INTC0_CONFIG0_CLEAR);
- break;
- case INTC_INT_DISABLED: /* 0:0:0 */
- outl(1<<irq_nr, INTC0_CONFIG0_CLEAR);
- outl(1<<irq_nr, INTC0_CONFIG1_CLEAR);
- outl(1<<irq_nr, INTC0_CONFIG2_CLEAR);
- break;
- default: /* disable the interrupt */
- printk("unexpected int type %d (irq %d)n", type, irq_nr);
- outl(1<<irq_nr, INTC0_CONFIG0_CLEAR);
- outl(1<<irq_nr, INTC0_CONFIG1_CLEAR);
- outl(1<<irq_nr, INTC0_CONFIG2_CLEAR);
- return;
- }
- if (int_req) /* assign to interrupt request 1 */
- outl(1<<irq_nr, INTC0_ASSIGN_REQ_CLEAR);
- else /* assign to interrupt request 0 */
- outl(1<<irq_nr, INTC0_ASSIGN_REQ_SET);
- outl(1<<irq_nr, INTC0_SOURCE_SET);
- outl(1<<irq_nr, INTC0_MASK_CLEAR);
- }
- sync();
- }
- static unsigned int startup_irq(unsigned int irq_nr)
- {
- local_enable_irq(irq_nr);
- return 0;
- }
- static void shutdown_irq(unsigned int irq_nr)
- {
- local_disable_irq(irq_nr);
- return;
- }
- static inline void local_enable_irq(unsigned int irq_nr)
- {
- if (irq_nr > AU1000_LAST_INTC0_INT) {
- outl(1<<irq_nr, INTC1_MASK_SET);
- }
- else {
- outl(1<<irq_nr, INTC0_MASK_SET);
- }
- sync();
- }
- static inline void local_disable_irq(unsigned int irq_nr)
- {
- if (irq_nr > AU1000_LAST_INTC0_INT) {
- outl(1<<irq_nr, INTC1_MASK_CLEAR);
- }
- else {
- outl(1<<irq_nr, INTC0_MASK_CLEAR);
- }
- sync();
- }
- static inline void mask_and_ack_rise_edge_irq(unsigned int irq_nr)
- {
- if (irq_nr > AU1000_LAST_INTC0_INT) {
- outl(1<<irq_nr, INTC1_R_EDGE_DETECT_CLEAR);
- outl(1<<irq_nr, INTC1_MASK_CLEAR);
- }
- else {
- outl(1<<irq_nr, INTC0_R_EDGE_DETECT_CLEAR);
- outl(1<<irq_nr, INTC0_MASK_CLEAR);
- }
- sync();
- }
- static inline void mask_and_ack_fall_edge_irq(unsigned int irq_nr)
- {
- if (irq_nr > AU1000_LAST_INTC0_INT) {
- outl(1<<irq_nr, INTC1_F_EDGE_DETECT_CLEAR);
- outl(1<<irq_nr, INTC1_MASK_CLEAR);
- }
- else {
- outl(1<<irq_nr, INTC0_F_EDGE_DETECT_CLEAR);
- outl(1<<irq_nr, INTC0_MASK_CLEAR);
- }
- }
- static inline void mask_and_ack_level_irq(unsigned int irq_nr)
- {
- local_disable_irq(irq_nr);
- sync();
- return;
- }
- static void end_irq(unsigned int irq_nr)
- {
- if (!(irq_desc[irq_nr].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
- local_enable_irq(irq_nr);
- else
- printk("warning: end_irq %d did not enablen", irq_nr);
- }
- static struct hw_interrupt_type rise_edge_irq_type = {
- "Au1000 Rise Edge",
- startup_irq,
- shutdown_irq,
- local_enable_irq,
- local_disable_irq,
- mask_and_ack_rise_edge_irq,
- end_irq,
- NULL
- };
- static struct hw_interrupt_type fall_edge_irq_type = {
- "Au1000 Fall Edge",
- startup_irq,
- shutdown_irq,
- local_enable_irq,
- local_disable_irq,
- mask_and_ack_fall_edge_irq,
- end_irq,
- NULL
- };
- static struct hw_interrupt_type level_irq_type = {
- "Au1000 Level",
- startup_irq,
- shutdown_irq,
- local_enable_irq,
- local_disable_irq,
- mask_and_ack_level_irq,
- end_irq,
- NULL
- };
- void enable_cpu_timer(void)
- {
- enable_cpu_irq_input(1<<MIPS_TIMER_IP); /* timer interrupt */
- }
- void __init init_IRQ(void)
- {
- int i;
- unsigned long cp0_status;
- cp0_status = read_32bit_cp0_register(CP0_STATUS);
- memset(irq_desc, 0, sizeof(irq_desc));
- set_except_vector(0, au1000_IRQ);
- init_generic_irq();
-
- /*
- * Setup high priority interrupts on int_request0; low priority on
- * int_request1
- */
- for (i = 0; i <= NR_IRQS; i++) {
- switch (i) {
- case AU1000_MAC0_DMA_INT:
- case AU1000_MAC1_DMA_INT:
- setup_local_irq(i, INTC_INT_HIGH_LEVEL, 0);
- irq_desc[i].handler = &level_irq_type;
- break;
- default: /* active high, level interrupt */
- setup_local_irq(i, INTC_INT_HIGH_LEVEL, 1);
- irq_desc[i].handler = &level_irq_type;
- break;
- }
- }
- set_cp0_status(ALLINTS);
- #ifdef CONFIG_REMOTE_DEBUG
- /* If local serial I/O used for debug port, enter kgdb at once */
- puts("Waiting for kgdb to connect...");
- set_debug_traps();
- breakpoint();
- #endif
- }
- void mips_spurious_interrupt(struct pt_regs *regs)
- {
- spurious_interrupts++;
- }
- void intc0_req0_irqdispatch(struct pt_regs *regs)
- {
- int irq = 0, i;
- unsigned long int_request;
- int_request = inl(INTC0_REQ0_INT);
- if (!int_request) return;
- for (i=0; i<32; i++) {
- if ((int_request & 0x1)) {
- do_IRQ(irq, regs);
- }
- irq++;
- int_request >>= 1;
- }
- }
- void intc0_req1_irqdispatch(struct pt_regs *regs)
- {
- int irq = 0, i;
- unsigned long int_request;
- int_request = inl(INTC0_REQ1_INT);
- if (!int_request) return;
- for (i=0; i<32; i++) {
- if ((int_request & 0x1)) {
- do_IRQ(irq, regs);
- }
- irq++;
- int_request >>= 1;
- }
- }
- void intc1_req0_irqdispatch(struct pt_regs *regs)
- {
- int irq = 0, i;
- unsigned long int_request;
- int_request = inl(INTC1_REQ0_INT);
- if (!int_request) return;
- for (i=0; i<32; i++) {
- if ((int_request & 0x1)) {
- do_IRQ(irq, regs);
- }
- irq++;
- int_request >>= 1;
- }
- }
- void intc1_req1_irqdispatch(struct pt_regs *regs)
- {
- int irq = 0, i;
- unsigned long int_request;
- int_request = inl(INTC1_REQ1_INT);
- if (!int_request) return;
- for (i=0; i<32; i++) {
- if ((int_request & 0x1)) {
- do_IRQ(irq, regs);
- }
- irq++;
- int_request >>= 1;
- }
- }