irq.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:15k
- /*
- * 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>
- #if defined(CONFIG_MIPS_PB1000)
- #include <asm/pb1000.h>
- #elif defined(CONFIG_MIPS_PB1500)
- #include <asm/pb1500.h>
- #elif defined(CONFIG_MIPS_PB1100)
- #include <asm/pb1100.h>
- #else
- #error unsupported alchemy board
- #endif
- #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 [NR_CPUS];
- 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);
- inline void local_enable_irq(unsigned int irq_nr);
- inline void local_disable_irq(unsigned int irq_nr);
- extern unsigned int do_IRQ(int irq, struct pt_regs *regs);
- extern void __init init_generic_irq(void);
- #ifdef CONFIG_PM
- extern void counter0_irq(int irq, void *dev_id, struct pt_regs *regs);
- #endif
- static void setup_local_irq(unsigned int irq_nr, int type, int int_req)
- {
- if (irq_nr > AU1000_MAX_INTR) return;
- /* Config2[n], Config1[n], Config0[n] */
- if (irq_nr > AU1000_LAST_INTC0_INT) {
- switch (type) {
- case INTC_INT_RISE_EDGE: /* 0:0:1 */
- au_writel(1<<(irq_nr-32), IC1_CFG2CLR);
- au_writel(1<<(irq_nr-32), IC1_CFG1CLR);
- au_writel(1<<(irq_nr-32), IC1_CFG0SET);
- break;
- case INTC_INT_FALL_EDGE: /* 0:1:0 */
- au_writel(1<<(irq_nr-32), IC1_CFG2CLR);
- au_writel(1<<(irq_nr-32), IC1_CFG1SET);
- au_writel(1<<(irq_nr-32), IC1_CFG0CLR);
- break;
- case INTC_INT_HIGH_LEVEL: /* 1:0:1 */
- au_writel(1<<(irq_nr-32), IC1_CFG2SET);
- au_writel(1<<(irq_nr-32), IC1_CFG1CLR);
- au_writel(1<<(irq_nr-32), IC1_CFG0SET);
- break;
- case INTC_INT_LOW_LEVEL: /* 1:1:0 */
- au_writel(1<<(irq_nr-32), IC1_CFG2SET);
- au_writel(1<<(irq_nr-32), IC1_CFG1SET);
- au_writel(1<<(irq_nr-32), IC1_CFG0CLR);
- break;
- case INTC_INT_DISABLED: /* 0:0:0 */
- au_writel(1<<(irq_nr-32), IC1_CFG0CLR);
- au_writel(1<<(irq_nr-32), IC1_CFG1CLR);
- au_writel(1<<(irq_nr-32), IC1_CFG2CLR);
- break;
- default: /* disable the interrupt */
- printk("unexpected int type %d (irq %d)n", type, irq_nr);
- au_writel(1<<(irq_nr-32), IC1_CFG0CLR);
- au_writel(1<<(irq_nr-32), IC1_CFG1CLR);
- au_writel(1<<(irq_nr-32), IC1_CFG2CLR);
- return;
- }
- if (int_req) /* assign to interrupt request 1 */
- au_writel(1<<(irq_nr-32), IC1_ASSIGNCLR);
- else /* assign to interrupt request 0 */
- au_writel(1<<(irq_nr-32), IC1_ASSIGNSET);
- au_writel(1<<(irq_nr-32), IC1_SRCSET);
- au_writel(1<<(irq_nr-32), IC1_MASKCLR);
- au_writel(1<<(irq_nr-32), IC1_WAKECLR);
- }
- else {
- switch (type) {
- case INTC_INT_RISE_EDGE: /* 0:0:1 */
- au_writel(1<<irq_nr, IC0_CFG2CLR);
- au_writel(1<<irq_nr, IC0_CFG1CLR);
- au_writel(1<<irq_nr, IC0_CFG0SET);
- break;
- case INTC_INT_FALL_EDGE: /* 0:1:0 */
- au_writel(1<<irq_nr, IC0_CFG2CLR);
- au_writel(1<<irq_nr, IC0_CFG1SET);
- au_writel(1<<irq_nr, IC0_CFG0CLR);
- break;
- case INTC_INT_HIGH_LEVEL: /* 1:0:1 */
- au_writel(1<<irq_nr, IC0_CFG2SET);
- au_writel(1<<irq_nr, IC0_CFG1CLR);
- au_writel(1<<irq_nr, IC0_CFG0SET);
- break;
- case INTC_INT_LOW_LEVEL: /* 1:1:0 */
- au_writel(1<<irq_nr, IC0_CFG2SET);
- au_writel(1<<irq_nr, IC0_CFG1SET);
- au_writel(1<<irq_nr, IC0_CFG0CLR);
- break;
- case INTC_INT_DISABLED: /* 0:0:0 */
- au_writel(1<<irq_nr, IC0_CFG0CLR);
- au_writel(1<<irq_nr, IC0_CFG1CLR);
- au_writel(1<<irq_nr, IC0_CFG2CLR);
- break;
- default: /* disable the interrupt */
- printk("unexpected int type %d (irq %d)n", type, irq_nr);
- au_writel(1<<irq_nr, IC0_CFG0CLR);
- au_writel(1<<irq_nr, IC0_CFG1CLR);
- au_writel(1<<irq_nr, IC0_CFG2CLR);
- return;
- }
- if (int_req) /* assign to interrupt request 1 */
- au_writel(1<<irq_nr, IC0_ASSIGNCLR);
- else /* assign to interrupt request 0 */
- au_writel(1<<irq_nr, IC0_ASSIGNSET);
- au_writel(1<<irq_nr, IC0_SRCSET);
- au_writel(1<<irq_nr, IC0_MASKCLR);
- au_writel(1<<irq_nr, IC0_WAKECLR);
- }
- au_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;
- }
- inline void local_enable_irq(unsigned int irq_nr)
- {
- if (irq_nr > AU1000_LAST_INTC0_INT) {
- au_writel(1<<(irq_nr-32), IC1_MASKSET);
- au_writel(1<<(irq_nr-32), IC1_WAKESET);
- }
- else {
- au_writel(1<<irq_nr, IC0_MASKSET);
- au_writel(1<<irq_nr, IC0_WAKESET);
- }
- au_sync();
- }
- inline void local_disable_irq(unsigned int irq_nr)
- {
- if (irq_nr > AU1000_LAST_INTC0_INT) {
- au_writel(1<<(irq_nr-32), IC1_MASKCLR);
- au_writel(1<<(irq_nr-32), IC1_WAKECLR);
- }
- else {
- au_writel(1<<irq_nr, IC0_MASKCLR);
- au_writel(1<<irq_nr, IC0_WAKECLR);
- }
- au_sync();
- }
- static inline void mask_and_ack_rise_edge_irq(unsigned int irq_nr)
- {
- if (irq_nr > AU1000_LAST_INTC0_INT) {
- au_writel(1<<(irq_nr-32), IC1_RISINGCLR);
- au_writel(1<<(irq_nr-32), IC1_MASKCLR);
- }
- else {
- au_writel(1<<irq_nr, IC0_RISINGCLR);
- au_writel(1<<irq_nr, IC0_MASKCLR);
- }
- au_sync();
- }
- static inline void mask_and_ack_fall_edge_irq(unsigned int irq_nr)
- {
- if (irq_nr > AU1000_LAST_INTC0_INT) {
- au_writel(1<<(irq_nr-32), IC1_FALLINGCLR);
- au_writel(1<<(irq_nr-32), IC1_MASKCLR);
- }
- else {
- au_writel(1<<irq_nr, IC0_FALLINGCLR);
- au_writel(1<<irq_nr, IC0_MASKCLR);
- }
- au_sync();
- }
- static inline void mask_and_ack_level_irq(unsigned int irq_nr)
- {
- local_disable_irq(irq_nr);
- au_sync();
- #if defined(CONFIG_MIPS_PB1000)
- if (irq_nr == AU1000_GPIO_15) {
- au_writel(0x8000, PB1000_MDR); /* ack int */
- au_sync();
- }
- #endif
- 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 enable (%x)n",
- irq_nr, irq_desc[irq_nr].status);
- }
- #if defined(CONFIG_MIPS_PB1000)
- if (irq_nr == AU1000_GPIO_15) {
- au_writel(0x4000, PB1000_MDR); /* enable int */
- au_sync();
- }
- #endif
- }
- unsigned long save_local_and_disable(int controller)
- {
- int i;
- unsigned long flags, mask;
- save_and_cli(flags);
- if (controller) {
- mask = au_readl(IC1_MASKSET);
- for (i=32; i<64; i++) {
- local_disable_irq(i);
- }
- }
- else {
- mask = au_readl(IC0_MASKSET);
- for (i=0; i<32; i++) {
- local_disable_irq(i);
- }
- }
- restore_flags(flags);
- return mask;
- }
- void restore_local_and_enable(int controller, unsigned long mask)
- {
- int i;
- unsigned long flags, new_mask;
- save_and_cli(flags);
- for (i=0; i<32; i++) {
- if (mask & (1<<i)) {
- if (controller)
- local_enable_irq(i+32);
- else
- local_enable_irq(i);
- }
- }
- if (controller)
- new_mask = au_readl(IC1_MASKSET);
- else
- new_mask = au_readl(IC0_MASKSET);
- restore_flags(flags);
- }
- 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
- };
- #ifdef CONFIG_PM
- void startup_match20_interrupt(void)
- {
- local_enable_irq(AU1000_TOY_MATCH2_INT);
- }
- #endif
- void __init init_IRQ(void)
- {
- int i;
- unsigned long cp0_status;
- extern char except_vec0_au1000;
- cp0_status = read_32bit_cp0_register(CP0_STATUS);
- memset(irq_desc, 0, sizeof(irq_desc));
- set_except_vector(0, au1000_IRQ);
- init_generic_irq();
- for (i = 0; i <= AU1000_MAX_INTR; i++) {
- switch (i) {
- case AU1000_UART0_INT:
- case AU1000_UART3_INT:
- #ifdef CONFIG_MIPS_PB1000
- case AU1000_UART1_INT:
- case AU1000_UART2_INT:
- case AU1000_SSI0_INT:
- case AU1000_SSI1_INT:
- #endif
- #ifdef CONFIG_MIPS_PB1100
- case AU1000_UART1_INT:
- case AU1000_SSI0_INT:
- case AU1000_SSI1_INT:
- #endif
- case AU1000_DMA_INT_BASE:
- case AU1000_DMA_INT_BASE+1:
- case AU1000_DMA_INT_BASE+2:
- case AU1000_DMA_INT_BASE+3:
- case AU1000_DMA_INT_BASE+4:
- case AU1000_DMA_INT_BASE+5:
- case AU1000_DMA_INT_BASE+6:
- case AU1000_DMA_INT_BASE+7:
- case AU1000_IRDA_TX_INT:
- case AU1000_IRDA_RX_INT:
- case AU1000_MAC0_DMA_INT:
- #ifdef CONFIG_MIPS_PB1000
- case AU1000_MAC1_DMA_INT:
- #endif
- #ifdef CONFIG_MIPS_PB1500
- case AU1000_MAC1_DMA_INT:
- #endif
- case AU1500_GPIO_204:
- setup_local_irq(i, INTC_INT_HIGH_LEVEL, 0);
- irq_desc[i].handler = &level_irq_type;
- break;
- #ifdef CONFIG_MIPS_PB1000
- case AU1000_GPIO_15:
- #endif
- case AU1000_USB_HOST_INT:
- #ifdef CONFIG_MIPS_PB1500
- case AU1000_PCI_INTA:
- case AU1000_PCI_INTB:
- case AU1000_PCI_INTC:
- case AU1000_PCI_INTD:
- case AU1500_GPIO_201:
- case AU1500_GPIO_202:
- case AU1500_GPIO_203:
- case AU1500_GPIO_205:
- case AU1500_GPIO_207:
- #endif
- #ifdef CONFIG_MIPS_PB1100
- case AU1000_GPIO_9: // PCMCIA Card Fully_Interted#
- case AU1000_GPIO_10: // PCMCIA_STSCHG#
- case AU1000_GPIO_11: // PCMCIA_IRQ#
- case AU1000_GPIO_13: // DC_IRQ#
- case AU1000_GPIO_23: // 2-wire SCL
- #endif
- setup_local_irq(i, INTC_INT_LOW_LEVEL, 0);
- irq_desc[i].handler = &level_irq_type;
- break;
- case AU1000_ACSYNC_INT:
- case AU1000_AC97C_INT:
- case AU1000_TOY_INT:
- case AU1000_TOY_MATCH0_INT:
- case AU1000_TOY_MATCH1_INT:
- case AU1000_USB_DEV_SUS_INT:
- case AU1000_USB_DEV_REQ_INT:
- case AU1000_RTC_INT:
- case AU1000_RTC_MATCH0_INT:
- case AU1000_RTC_MATCH1_INT:
- case AU1000_RTC_MATCH2_INT:
- setup_local_irq(i, INTC_INT_RISE_EDGE, 0);
- irq_desc[i].handler = &rise_edge_irq_type;
- break;
- // Careful if you change match 2 request!
- // The interrupt handler is called directly
- // from the low level dispatch code.
- case AU1000_TOY_MATCH2_INT:
- setup_local_irq(i, INTC_INT_RISE_EDGE, 1);
- irq_desc[i].handler = &rise_edge_irq_type;
- break;
- default: /* active high, level interrupt */
- setup_local_irq(i, INTC_INT_HIGH_LEVEL, 0);
- 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
- }
- /*
- * Interrupts are nested. Even if an interrupt handler is registered
- * as "fast", we might get another interrupt before we return from
- * intcX_reqX_irqdispatch().
- */
- void intc0_req0_irqdispatch(struct pt_regs *regs)
- {
- int irq = 0, i;
- static unsigned long intc0_req0 = 0;
- intc0_req0 |= au_readl(IC0_REQ0INT);
- if (!intc0_req0) return;
- /*
- * Because of the tight timing of SETUP token to reply
- * transactions, the USB devices-side packet complete
- * interrupt needs the highest priority.
- */
- if ((intc0_req0 & (1<<AU1000_USB_DEV_REQ_INT))) {
- intc0_req0 &= ~(1<<AU1000_USB_DEV_REQ_INT);
- do_IRQ(AU1000_USB_DEV_REQ_INT, regs);
- return;
- }
- for (i=0; i<32; i++) {
- if ((intc0_req0 & (1<<i))) {
- intc0_req0 &= ~(1<<i);
- do_IRQ(irq, regs);
- break;
- }
- irq++;
- }
- }
- void intc0_req1_irqdispatch(struct pt_regs *regs)
- {
- int irq = 0, i;
- static unsigned long intc0_req1 = 0;
- intc0_req1 = au_readl(IC0_REQ1INT);
- if (!intc0_req1) return;
- for (i=0; i<32; i++) {
- if ((intc0_req1 & (1<<i))) {
- intc0_req1 &= ~(1<<i);
- #ifdef CONFIG_PM
- if (i == AU1000_TOY_MATCH2_INT) {
- mask_and_ack_rise_edge_irq(irq);
- counter0_irq(irq, NULL, regs);
- local_enable_irq(irq);
- }
- else
- #endif
- {
- do_IRQ(irq, regs);
- }
- break;
- }
- irq++;
- }
- }
- /*
- * Interrupt Controller 1:
- * interrupts 32 - 63
- */
- void intc1_req0_irqdispatch(struct pt_regs *regs)
- {
- int irq = 0, i;
- static unsigned long intc1_req0 = 0;
- volatile unsigned short levels, mdr;
- unsigned char ide_status;
- intc1_req0 |= au_readl(IC1_REQ0INT);
- if (!intc1_req0) return;
- #if defined(CONFIG_MIPS_PB1000) && defined(DEBUG_IRQ)
- au_writel(1, CPLD_AUX0); /* debug led 0 */
- #endif
- for (i=0; i<32; i++) {
- if ((intc1_req0 & (1<<i))) {
- intc1_req0 &= ~(1<<i);
- #if defined(CONFIG_MIPS_PB1000) && defined(DEBUG_IRQ)
- au_writel(2, CPLD_AUX0); /* turn on debug led 1 */
- do_IRQ(irq+32, regs);
- au_writel(0, CPLD_AUX0); /* turn off debug led 1 */
- #else
- do_IRQ(irq+32, regs);
- #endif
- break;
- }
- irq++;
- }
- #if defined(CONFIG_MIPS_PB1000) && defined(DEBUG_IRQ)
- au_writel(0, CPLD_AUX0);
- #endif
- }
- void intc1_req1_irqdispatch(struct pt_regs *regs)
- {
- int irq = 0, i;
- static unsigned long intc1_req1 = 0;
- intc1_req1 |= au_readl(IC1_REQ1INT);
- if (!intc1_req1) return;
- for (i=0; i<32; i++) {
- if ((intc1_req1 & (1<<i))) {
- intc1_req1 &= ~(1<<i);
- do_IRQ(irq+32, regs);
- break;
- }
- irq++;
- }
- }