irq.c
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上传日期:2013-02-24
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文件大小:15k
- /*
- *
- * BRIEF MODULE DESCRIPTION
- * ITE 8172G interrupt/setup routines.
- *
- * Copyright 2000,2001 MontaVista Software Inc.
- * Author: MontaVista Software, Inc.
- * ppopov@mvista.com or source@mvista.com
- *
- * Part of this file was derived from Carsten Langgaard's
- * arch/mips/mips-boards/atlas/atlas_int.c.
- *
- * Carsten Langgaard, carstenl@mips.com
- * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
- *
- * 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/serial_reg.h>
- #include <asm/bitops.h>
- #include <asm/bootinfo.h>
- #include <asm/io.h>
- #include <asm/mipsregs.h>
- #include <asm/system.h>
- #include <asm/it8172/it8172.h>
- #include <asm/it8172/it8172_int.h>
- #include <asm/it8172/it8172_dbg.h>
- #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
- #ifdef CONFIG_REMOTE_DEBUG
- extern void breakpoint(void);
- #endif
- /* revisit */
- #define EXT_IRQ0_TO_IP 2 /* IP 2 */
- #define EXT_IRQ5_TO_IP 7 /* IP 7 */
- extern void set_debug_traps(void);
- extern void mips_timer_interrupt(int irq, struct pt_regs *regs);
- extern asmlinkage void it8172_IRQ(void);
- unsigned int local_bh_count[NR_CPUS];
- unsigned int local_irq_count[NR_CPUS];
- unsigned long spurious_count = 0;
- irq_desc_t irq_desc[NR_IRQS];
- irq_desc_t *irq_desc_base=&irq_desc[0];
- void disable_it8172_irq(unsigned int irq_nr);
- void enable_it8172_irq(unsigned int irq_nr);
- struct it8172_intc_regs volatile *it8172_hw0_icregs
- = (struct it8172_intc_regs volatile *)(KSEG1ADDR(IT8172_PCI_IO_BASE + IT_INTC_BASE));
- /* 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_irq(unsigned int irq_nr)
- {
- modify_cp0_intmask(irq_nr, 0);
- }
- static inline void unmask_irq(unsigned int irq_nr)
- {
- modify_cp0_intmask(0, irq_nr);
- }
- void disable_irq(unsigned int irq_nr)
- {
- unsigned long flags;
- save_and_cli(flags);
- disable_it8172_irq(irq_nr);
- restore_flags(flags);
- }
- void enable_irq(unsigned int irq_nr)
- {
- unsigned long flags;
- save_and_cli(flags);
- enable_it8172_irq(irq_nr);
- restore_flags(flags);
- }
- void disable_it8172_irq(unsigned int irq_nr)
- {
- DPRINTK("disable_it8172_irq %dn", irq_nr);
- if ( (irq_nr >= IT8172_LPC_IRQ_BASE) && (irq_nr <= IT8172_SERIRQ_15)) {
- /* LPC interrupt */
- DPRINTK("disable, before lpc_mask %xn", it8172_hw0_icregs->lpc_mask);
- it8172_hw0_icregs->lpc_mask |= (1 << (irq_nr - IT8172_LPC_IRQ_BASE));
- DPRINTK("disable, after lpc_mask %xn", it8172_hw0_icregs->lpc_mask);
- }
- else if ( (irq_nr >= IT8172_LB_IRQ_BASE) && (irq_nr <= IT8172_IOCHK_IRQ)) {
- /* Local Bus interrupt */
- DPRINTK("before lb_mask %xn", it8172_hw0_icregs->lb_mask);
- it8172_hw0_icregs->lb_mask |= (1 << (irq_nr - IT8172_LB_IRQ_BASE));
- DPRINTK("after lb_mask %xn", it8172_hw0_icregs->lb_mask);
- }
- else if ( (irq_nr >= IT8172_PCI_DEV_IRQ_BASE) && (irq_nr <= IT8172_DMA_IRQ)) {
- /* PCI and other interrupts */
- DPRINTK("before pci_mask %xn", it8172_hw0_icregs->pci_mask);
- it8172_hw0_icregs->pci_mask |= (1 << (irq_nr - IT8172_PCI_DEV_IRQ_BASE));
- DPRINTK("after pci_mask %xn", it8172_hw0_icregs->pci_mask);
- }
- else if ( (irq_nr >= IT8172_NMI_IRQ_BASE) && (irq_nr <= IT8172_POWER_NMI_IRQ)) {
- /* NMI interrupts */
- DPRINTK("before nmi_mask %xn", it8172_hw0_icregs->nmi_mask);
- it8172_hw0_icregs->nmi_mask |= (1 << (irq_nr - IT8172_NMI_IRQ_BASE));
- DPRINTK("after nmi_mask %xn", it8172_hw0_icregs->nmi_mask);
- }
- else {
- panic("disable_it8172_irq: bad irq %dn", irq_nr);
- }
- }
- void enable_it8172_irq(unsigned int irq_nr)
- {
- DPRINTK("enable_it8172_irq %dn", irq_nr);
- if ( (irq_nr >= IT8172_LPC_IRQ_BASE) && (irq_nr <= IT8172_SERIRQ_15)) {
- /* LPC interrupt */
- DPRINTK("enable, before lpc_mask %xn", it8172_hw0_icregs->lpc_mask);
- it8172_hw0_icregs->lpc_mask &= ~(1 << (irq_nr - IT8172_LPC_IRQ_BASE));
- DPRINTK("enable, after lpc_mask %xn", it8172_hw0_icregs->lpc_mask);
- }
- else if ( (irq_nr >= IT8172_LB_IRQ_BASE) && (irq_nr <= IT8172_IOCHK_IRQ)) {
- /* Local Bus interrupt */
- DPRINTK("before lb_mask %xn", it8172_hw0_icregs->lb_mask);
- it8172_hw0_icregs->lb_mask &= ~(1 << (irq_nr - IT8172_LB_IRQ_BASE));
- DPRINTK("after lb_mask %xn", it8172_hw0_icregs->lb_mask);
- }
- else if ( (irq_nr >= IT8172_PCI_DEV_IRQ_BASE) && (irq_nr <= IT8172_DMA_IRQ)) {
- /* PCI and other interrupts */
- DPRINTK("before pci_mask %xn", it8172_hw0_icregs->pci_mask);
- it8172_hw0_icregs->pci_mask &= ~(1 << (irq_nr - IT8172_PCI_DEV_IRQ_BASE));
- DPRINTK("after pci_mask %xn", it8172_hw0_icregs->pci_mask);
- }
- else if ( (irq_nr >= IT8172_NMI_IRQ_BASE) && (irq_nr <= IT8172_POWER_NMI_IRQ)) {
- /* NMI interrupts */
- DPRINTK("before nmi_mask %xn", it8172_hw0_icregs->nmi_mask);
- it8172_hw0_icregs->nmi_mask &= ~(1 << (irq_nr - IT8172_NMI_IRQ_BASE));
- DPRINTK("after nmi_mask %xn", it8172_hw0_icregs->nmi_mask);
- }
- else {
- panic("enable_it8172_irq: bad irq %dn", irq_nr);
- }
- }
- static unsigned int startup_ite_irq(unsigned int irq)
- {
- enable_it8172_irq(irq);
- return 0;
- }
- #define shutdown_ite_irq disable_it8172_irq
- #define mask_and_ack_ite_irq disable_it8172_irq
- static void end_ite_irq(unsigned int irq)
- {
- if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
- enable_it8172_irq(irq);
- }
- static struct hw_interrupt_type it8172_irq_type = {
- "ITE8172",
- startup_ite_irq,
- shutdown_ite_irq,
- enable_it8172_irq,
- disable_it8172_irq,
- mask_and_ack_ite_irq,
- end_ite_irq,
- NULL
- };
- int get_irq_list(char *buf)
- {
- int i, len = 0, j;
- struct irqaction * action;
- len += sprintf(buf+len, " ");
- for (j=0; j<smp_num_cpus; j++)
- len += sprintf(buf+len, "CPU%d ",j);
- *(char *)(buf+len++) = 'n';
- for (i = 0 ; i < NR_IRQS ; i++) {
- action = irq_desc[i].action;
- if ( !action || !action->handler )
- continue;
- len += sprintf(buf+len, "%3d: ", i);
- len += sprintf(buf+len, "%10u ", kstat_irqs(i));
- if ( irq_desc[i].handler )
- len += sprintf(buf+len, " %s ", irq_desc[i].handler->typename );
- else
- len += sprintf(buf+len, " None ");
- len += sprintf(buf+len, " %s",action->name);
- for (action=action->next; action; action = action->next) {
- len += sprintf(buf+len, ", %s", action->name);
- }
- len += sprintf(buf+len, "n");
- }
- len += sprintf(buf+len, "BAD: %10lun", spurious_count);
- return len;
- }
- asmlinkage void do_IRQ(int irq, struct pt_regs *regs)
- {
- struct irqaction *action;
- int cpu;
- cpu = smp_processor_id();
- irq_enter(cpu, irq);
- kstat.irqs[cpu][irq]++;
- #if 0
- if (irq_desc[irq].handler && irq_desc[irq].handler->ack) {
- // printk("invoking ack handlern");
- irq_desc[irq].handler->ack(irq);
- }
- #endif
- action = irq_desc[irq].action;
- if (action && action->handler)
- {
- //mask_irq(1<<irq);
- //printk("action->handler %xn", action->handler);
- disable_it8172_irq(irq);
- //if (!(action->flags & SA_INTERRUPT)) __sti(); /* reenable ints */
- do {
- action->handler(irq, action->dev_id, regs);
- action = action->next;
- } while ( action );
- //__cli(); /* disable ints */
- if (irq_desc[irq].handler)
- {
- }
- //unmask_irq(1<<irq);
- enable_it8172_irq(irq);
- }
- else
- {
- spurious_count++;
- printk("Unhandled interrupt %d, cause %x, disabledn",
- (unsigned)irq, (unsigned)regs->cp0_cause);
- disable_it8172_irq(irq);
- }
- irq_exit(cpu, irq);
- }
- int request_irq(unsigned int irq, void (*handler)(int, void *, struct pt_regs *),
- unsigned long irqflags, const char * devname, void *dev_id)
- {
- struct irqaction *old, **p, *action;
- unsigned long flags;
- /*
- * IP0 and IP1 are software interrupts. IP7 is typically the timer interrupt.
- *
- * The ITE QED-4N-S01B board has one single interrupt line going from
- * the system controller to the CPU. It's connected to the CPU external
- * irq pin 1, which is IP2. The interrupt numbers are listed in it8172_int.h;
- * the ISA interrupts are numbered from 0 to 15, and the rest go from
- * there.
- */
- //printk("request_irq: %d handler %xn", irq, handler);
- if (irq >= NR_IRQS)
- return -EINVAL;
- if (!handler)
- {
- /* Free */
- for (p = &irq_desc[irq].action; (action = *p) != NULL; p = &action->next)
- {
- /* Found it - now free it */
- save_flags(flags);
- cli();
- *p = action->next;
- disable_it8172_irq(irq);
- restore_flags(flags);
- kfree(action);
- return 0;
- }
- return -ENOENT;
- }
-
- action = (struct irqaction *)
- kmalloc(sizeof(struct irqaction), GFP_KERNEL);
- if (!action)
- return -ENOMEM;
- memset(action, 0, sizeof(struct irqaction));
-
- save_flags(flags);
- cli();
-
- action->handler = handler;
- action->flags = irqflags;
- action->mask = 0;
- action->name = devname;
- action->dev_id = dev_id;
- action->next = NULL;
- p = &irq_desc[irq].action;
-
- if ((old = *p) != NULL) {
- /* Can't share interrupts unless both agree to */
- if (!(old->flags & action->flags & SA_SHIRQ))
- return -EBUSY;
- /* add new interrupt at end of irq queue */
- do {
- p = &old->next;
- old = *p;
- } while (old);
- }
- *p = action;
- enable_it8172_irq(irq);
- restore_flags(flags);
- #if 0
- printk("request_irq: status %x cause %xn",
- read_32bit_cp0_register(CP0_STATUS), read_32bit_cp0_register(CP0_CAUSE));
- #endif
- return 0;
- }
-
- void free_irq(unsigned int irq, void *dev_id)
- {
- request_irq(irq, NULL, 0, NULL, dev_id);
- }
- void enable_cpu_timer(void)
- {
- unsigned long flags;
- save_and_cli(flags);
- unmask_irq(1<<EXT_IRQ5_TO_IP); /* timer interrupt */
- restore_flags(flags);
- }
- unsigned long probe_irq_on (void)
- {
- return 0;
- }
- int probe_irq_off (unsigned long irqs)
- {
- return 0;
- }
- void __init init_IRQ(void)
- {
- int i;
- unsigned long flags;
- memset(irq_desc, 0, sizeof(irq_desc));
- set_except_vector(0, it8172_IRQ);
- /* mask all interrupts */
- it8172_hw0_icregs->lb_mask = 0xffff;
- it8172_hw0_icregs->lpc_mask = 0xffff;
- it8172_hw0_icregs->pci_mask = 0xffff;
- it8172_hw0_icregs->nmi_mask = 0xffff;
- /* make all interrupts level triggered */
- it8172_hw0_icregs->lb_trigger = 0;
- it8172_hw0_icregs->lpc_trigger = 0;
- it8172_hw0_icregs->pci_trigger = 0;
- it8172_hw0_icregs->nmi_trigger = 0;
- /* active level setting */
- /* uart, keyboard, and mouse are active high */
- it8172_hw0_icregs->lpc_level = (0x10 | 0x2 | 0x1000);
- it8172_hw0_icregs->lb_level |= 0x20;
- /* keyboard and mouse are edge triggered */
- it8172_hw0_icregs->lpc_trigger |= (0x2 | 0x1000);
- #if 0
- // Enable this piece of code to make internal USB interrupt
- // edge triggered.
- it8172_hw0_icregs->pci_trigger |=
- (1 << (IT8172_USB_IRQ - IT8172_PCI_DEV_IRQ_BASE));
- it8172_hw0_icregs->pci_level &=
- ~(1 << (IT8172_USB_IRQ - IT8172_PCI_DEV_IRQ_BASE));
- #endif
- for (i = 0; i <= IT8172_INT_END; i++) {
- irq_desc[i].status = IRQ_DISABLED;
- irq_desc[i].action = 0;
- irq_desc[i].depth = 1;
- irq_desc[i].handler = &it8172_irq_type;
- }
- /*
- * Enable external int line 2
- * All ITE interrupts are masked for now.
- */
- save_and_cli(flags);
- unmask_irq(1<<EXT_IRQ0_TO_IP);
- restore_flags(flags);
- #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)
- {
- #if 1
- return;
- #else
- unsigned long status, cause;
- printk("got spurious interruptn");
- status = read_32bit_cp0_register(CP0_STATUS);
- cause = read_32bit_cp0_register(CP0_CAUSE);
- printk("status %x cause %xn", status, cause);
- printk("epc %x badvaddr %x n", regs->cp0_epc, regs->cp0_badvaddr);
- // while(1);
- #endif
- }
- void it8172_hw0_irqdispatch(struct pt_regs *regs)
- {
- int irq;
- unsigned short intstatus, status;
- intstatus = it8172_hw0_icregs->intstatus;
- if (intstatus & 0x8) {
- panic("Got NMI interruptn");
- }
- else if (intstatus & 0x4) {
- /* PCI interrupt */
- irq = 0;
- status = it8172_hw0_icregs->pci_req;
- while (!(status & 0x1)) {
- irq++;
- status >>= 1;
- }
- irq += IT8172_PCI_DEV_IRQ_BASE;
- //printk("pci int %dn", irq);
- }
- else if (intstatus & 0x1) {
- /* Local Bus interrupt */
- irq = 0;
- status = it8172_hw0_icregs->lb_req;
- while (!(status & 0x1)) {
- irq++;
- status >>= 1;
- }
- irq += IT8172_LB_IRQ_BASE;
- //printk("lb int %dn", irq);
- }
- else if (intstatus & 0x2) {
- /* LPC interrupt */
- /* Since some lpc interrupts are edge triggered,
- * we could lose an interrupt this way because
- * we acknowledge all ints at onces. Revisit.
- */
- status = it8172_hw0_icregs->lpc_req;
- it8172_hw0_icregs->lpc_req = 0; /* acknowledge ints */
- irq = 0;
- while (!(status & 0x1)) {
- irq++;
- status >>= 1;
- }
- irq += IT8172_LPC_IRQ_BASE;
- //printk("LPC int %dn", irq);
- }
- else {
- return;
- }
- do_IRQ(irq, regs);
- }
- void show_pending_irqs(void)
- {
- fputs("intstatus: ");
- put32(it8172_hw0_icregs->intstatus);
- puts("");
- fputs("pci_req: ");
- put32(it8172_hw0_icregs->pci_req);
- puts("");
- fputs("lb_req: ");
- put32(it8172_hw0_icregs->lb_req);
- puts("");
- fputs("lpc_req: ");
- put32(it8172_hw0_icregs->lpc_req);
- puts("");
- }