open_pic.c
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上传日期:2013-04-10
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文件大小:21k
- /*
- * arch/ppc/kernel/open_pic.c -- OpenPIC Interrupt Handling
- *
- * Copyright (C) 1997 Geert Uytterhoeven
- *
- * 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.
- */
- #include <linux/config.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/init.h>
- #include <linux/irq.h>
- #include <asm/ptrace.h>
- #include <asm/signal.h>
- #include <asm/io.h>
- #include <asm/pgtable.h>
- #include <asm/irq.h>
- #include <asm/prom.h>
- #include <asm/machdep.h>
- #include "local_irq.h"
- #include "open_pic.h"
- #include "open_pic_defs.h"
- #include "i8259.h"
- #include <asm/ppcdebug.h>
- void* OpenPIC_Addr;
- static volatile struct OpenPIC *OpenPIC = NULL;
- u_int OpenPIC_NumInitSenses __initdata = 0;
- u_char *OpenPIC_InitSenses __initdata = NULL;
- void find_ISUs(void);
- static u_int NumProcessors;
- static u_int NumSources;
- static int NumISUs;
- static int open_pic_irq_offset;
- static volatile unsigned char* chrp_int_ack_special;
- static int broken_ipi_registers;
- OpenPIC_SourcePtr ISU[OPENPIC_MAX_ISU];
- static void openpic_end_irq(unsigned int irq_nr);
- static void openpic_set_affinity(unsigned int irq_nr, unsigned long cpumask);
- struct hw_interrupt_type open_pic = {
- " OpenPIC ",
- NULL,
- NULL,
- openpic_enable_irq,
- openpic_disable_irq,
- NULL,
- openpic_end_irq,
- openpic_set_affinity
- };
- #ifdef CONFIG_SMP
- static void openpic_end_ipi(unsigned int irq_nr);
- static void openpic_enable_ipi(unsigned int irq_nr);
- static void openpic_disable_ipi(unsigned int irq_nr);
- struct hw_interrupt_type open_pic_ipi = {
- " OpenPIC ",
- NULL,
- NULL,
- openpic_enable_ipi,
- openpic_disable_ipi,
- NULL,
- openpic_end_ipi,
- NULL
- };
- #endif /* CONFIG_SMP */
- unsigned int openpic_vec_ipi;
- unsigned int openpic_vec_timer;
- unsigned int openpic_vec_spurious;
- /*
- * Accesses to the current processor's openpic registers
- */
- #ifdef CONFIG_SMP
- #define THIS_CPU Processor[cpu]
- #define DECL_THIS_CPU int cpu = hard_smp_processor_id()
- #define CHECK_THIS_CPU check_arg_cpu(cpu)
- #else
- #define THIS_CPU Processor[hard_smp_processor_id()]
- #define DECL_THIS_CPU
- #define CHECK_THIS_CPU
- #endif /* CONFIG_SMP */
- #if 1
- #define check_arg_ipi(ipi)
- if (ipi < 0 || ipi >= OPENPIC_NUM_IPI)
- printk(KERN_ERR "open_pic.c:%d: illegal ipi %dn", __LINE__, ipi);
- #define check_arg_timer(timer)
- if (timer < 0 || timer >= OPENPIC_NUM_TIMERS)
- printk(KERN_ERR "open_pic.c:%d: illegal timer %dn", __LINE__, timer);
- #define check_arg_vec(vec)
- if (vec < 0 || vec >= OPENPIC_NUM_VECTORS)
- printk(KERN_ERR "open_pic.c:%d: illegal vector %dn", __LINE__, vec);
- #define check_arg_pri(pri)
- if (pri < 0 || pri >= OPENPIC_NUM_PRI)
- printk(KERN_ERR "open_pic.c:%d: illegal priority %dn", __LINE__, pri);
- /*
- * Print out a backtrace if it's out of range, since if it's larger than NR_IRQ's
- * data has probably been corrupted and we're going to panic or deadlock later
- * anyway --Troy
- */
- extern unsigned long* _get_SP(void);
- #define check_arg_irq(irq)
- if (irq < open_pic_irq_offset || irq >= (NumSources+open_pic_irq_offset)){
- printk(KERN_ERR "open_pic.c:%d: illegal irq %dn", __LINE__, irq);
- print_backtrace(_get_SP()); }
- #define check_arg_cpu(cpu)
- if (cpu < 0 || cpu >= OPENPIC_MAX_PROCESSORS){
- printk(KERN_ERR "open_pic.c:%d: illegal cpu %dn", __LINE__, cpu);
- print_backtrace(_get_SP()); }
- #else
- #define check_arg_ipi(ipi) do {} while (0)
- #define check_arg_timer(timer) do {} while (0)
- #define check_arg_vec(vec) do {} while (0)
- #define check_arg_pri(pri) do {} while (0)
- #define check_arg_irq(irq) do {} while (0)
- #define check_arg_cpu(cpu) do {} while (0)
- #endif
- #define GET_ISU(source) ISU[(source) >> 4][(source) & 0xf]
- void __init openpic_init_IRQ(void)
- {
- struct device_node *np;
- int i;
- unsigned int *addrp;
- unsigned char* chrp_int_ack_special = 0;
- unsigned char init_senses[NR_IRQS - NUM_8259_INTERRUPTS];
- int nmi_irq = -1;
- #if defined(CONFIG_VT) && defined(CONFIG_ADB_KEYBOARD) && defined(XMON)
- struct device_node *kbd;
- #endif
- if (!(np = find_devices("pci"))
- || !(addrp = (unsigned int *)
- get_property(np, "8259-interrupt-acknowledge", NULL)))
- printk(KERN_ERR "Cannot find pci to get ack addressn");
- else
- chrp_int_ack_special = (unsigned char *)
- __ioremap(addrp[prom_n_addr_cells(np)-1], 1, _PAGE_NO_CACHE);
- /* hydra still sets OpenPIC_InitSenses to a static set of values */
- if (OpenPIC_InitSenses == NULL) {
- prom_get_irq_senses(init_senses, NUM_8259_INTERRUPTS, NR_IRQS);
- OpenPIC_InitSenses = init_senses;
- OpenPIC_NumInitSenses = NR_IRQS - NUM_8259_INTERRUPTS;
- }
- openpic_init(1, NUM_8259_INTERRUPTS, chrp_int_ack_special, nmi_irq);
- for ( i = 0 ; i < NUM_8259_INTERRUPTS ; i++ )
- irq_desc[i].handler = &i8259_pic;
- i8259_init();
- }
- static inline u_int openpic_read(volatile u_int *addr)
- {
- u_int val;
- val = in_le32(addr);
- return val;
- }
- static inline void openpic_write(volatile u_int *addr, u_int val)
- {
- out_le32(addr, val);
- }
- static inline u_int openpic_readfield(volatile u_int *addr, u_int mask)
- {
- u_int val = openpic_read(addr);
- return val & mask;
- }
- static inline void openpic_writefield(volatile u_int *addr, u_int mask,
- u_int field)
- {
- u_int val = openpic_read(addr);
- openpic_write(addr, (val & ~mask) | (field & mask));
- }
- static inline void openpic_clearfield(volatile u_int *addr, u_int mask)
- {
- openpic_writefield(addr, mask, 0);
- }
- static inline void openpic_setfield(volatile u_int *addr, u_int mask)
- {
- openpic_writefield(addr, mask, mask);
- }
- static void openpic_safe_writefield(volatile u_int *addr, u_int mask,
- u_int field)
- {
- unsigned int loops = 100000;
- openpic_setfield(addr, OPENPIC_MASK);
- while (openpic_read(addr) & OPENPIC_ACTIVITY) {
- if (!loops--) {
- printk(KERN_ERR "openpic_safe_writefield timeoutn");
- break;
- }
- }
- openpic_writefield(addr, mask | OPENPIC_MASK, field | OPENPIC_MASK);
- }
- #ifdef CONFIG_SMP
- static u_int openpic_read_IPI(volatile u_int* addr)
- {
- u_int val = 0;
- if (broken_ipi_registers)
- /* yes this is right ... bug, feature, you decide! -- tgall */
- val = in_be32(addr);
- else
- val = in_le32(addr);
- return val;
- }
- static void openpic_test_broken_IPI(void)
- {
- u_int t;
- openpic_write(&OpenPIC->Global.IPI_Vector_Priority(0), OPENPIC_MASK);
- t = openpic_read(&OpenPIC->Global.IPI_Vector_Priority(0));
- if (t == le32_to_cpu(OPENPIC_MASK)) {
- printk(KERN_INFO "OpenPIC reversed IPI registers detectedn");
- broken_ipi_registers = 1;
- }
- }
- /* because of the power3 be / le above, this is needed */
- static inline void openpic_writefield_IPI(volatile u_int* addr, u_int mask, u_int field)
- {
- u_int val = openpic_read_IPI(addr);
- openpic_write(addr, (val & ~mask) | (field & mask));
- }
- static inline void openpic_clearfield_IPI(volatile u_int *addr, u_int mask)
- {
- openpic_writefield_IPI(addr, mask, 0);
- }
- static inline void openpic_setfield_IPI(volatile u_int *addr, u_int mask)
- {
- openpic_writefield_IPI(addr, mask, mask);
- }
- static void openpic_safe_writefield_IPI(volatile u_int *addr, u_int mask, u_int field)
- {
- unsigned int loops = 100000;
- openpic_setfield_IPI(addr, OPENPIC_MASK);
- /* wait until it's not in use */
- /* BenH: Is this code really enough ? I would rather check the result
- * and eventually retry ...
- */
- while(openpic_read_IPI(addr) & OPENPIC_ACTIVITY) {
- if (!loops--) {
- printk(KERN_ERR "openpic_safe_writefield timeoutn");
- break;
- }
- }
- openpic_writefield_IPI(addr, mask, field | OPENPIC_MASK);
- }
- #endif /* CONFIG_SMP */
- void __init openpic_init(int main_pic, int offset, unsigned char* chrp_ack,
- int programmer_switch_irq)
- {
- u_int t, i;
- u_int timerfreq;
- const char *version;
- if (!OpenPIC_Addr) {
- printk(KERN_INFO "No OpenPIC found !n");
- return;
- }
- OpenPIC = (volatile struct OpenPIC *)OpenPIC_Addr;
- ppc64_boot_msg(0x20, "OpenPic Init");
- t = openpic_read(&OpenPIC->Global.Feature_Reporting0);
- switch (t & OPENPIC_FEATURE_VERSION_MASK) {
- case 1:
- version = "1.0";
- break;
- case 2:
- version = "1.2";
- break;
- case 3:
- version = "1.3";
- break;
- default:
- version = "?";
- break;
- }
- NumProcessors = ((t & OPENPIC_FEATURE_LAST_PROCESSOR_MASK) >>
- OPENPIC_FEATURE_LAST_PROCESSOR_SHIFT) + 1;
- NumSources = ((t & OPENPIC_FEATURE_LAST_SOURCE_MASK) >>
- OPENPIC_FEATURE_LAST_SOURCE_SHIFT) + 1;
- printk(KERN_INFO "OpenPIC Version %s (%d CPUs and %d IRQ sources) at %pn",
- version, NumProcessors, NumSources, OpenPIC);
- timerfreq = openpic_read(&OpenPIC->Global.Timer_Frequency);
- if (timerfreq)
- printk(KERN_INFO "OpenPIC timer frequency is %d.%06d MHzn",
- timerfreq / 1000000, timerfreq % 1000000);
- if (!main_pic)
- return;
- open_pic_irq_offset = offset;
- chrp_int_ack_special = (volatile unsigned char*)chrp_ack;
- find_ISUs();
- /* Initialize timer interrupts */
- ppc64_boot_msg(0x21, "OpenPic Timer");
- for (i = 0; i < OPENPIC_NUM_TIMERS; i++) {
- /* Disabled, Priority 0 */
- openpic_inittimer(i, 0, openpic_vec_timer+i);
- /* No processor */
- openpic_maptimer(i, 0);
- }
- #ifdef CONFIG_SMP
- /* Initialize IPI interrupts */
- ppc64_boot_msg(0x22, "OpenPic IPI");
- openpic_test_broken_IPI();
- for (i = 0; i < OPENPIC_NUM_IPI; i++) {
- /* Disabled, Priority 10..13 */
- openpic_initipi(i, 10+i, openpic_vec_ipi+i);
- /* IPIs are per-CPU */
- irq_desc[openpic_vec_ipi+i].status |= IRQ_PER_CPU;
- irq_desc[openpic_vec_ipi+i].handler = &open_pic_ipi;
- }
- #endif
- /* Initialize external interrupts */
- ppc64_boot_msg(0x23, "OpenPic Ext");
- openpic_set_priority(0xf);
- /* SIOint (8259 cascade) is special */
- if (offset) {
- openpic_initirq(0, 8, offset, 1, 1);
- openpic_mapirq(0, 1<<get_hard_smp_processor_id(0));
- }
- /* Init all external sources */
- for (i = 1; i < NumSources; i++) {
- int pri, sense;
- /* the bootloader may have left it enabled (bad !) */
- openpic_disable_irq(i+offset);
- pri = (i == programmer_switch_irq)? 9: 8;
- sense = (i < OpenPIC_NumInitSenses)? OpenPIC_InitSenses[i]: 1;
- if (sense)
- irq_desc[i+offset].status = IRQ_LEVEL;
- /* Enabled, Priority 8 or 9 */
- openpic_initirq(i, pri, i+offset, !sense, sense);
- /* Processor 0 */
- openpic_mapirq(i, 1<<get_hard_smp_processor_id(0));
- }
- /* Init descriptors */
- for (i = offset; i < NumSources + offset; i++)
- irq_desc[i].handler = &open_pic;
- /* Initialize the spurious interrupt */
- ppc64_boot_msg(0x24, "OpenPic Spurious");
- openpic_set_spurious(openpic_vec_spurious);
- /* Initialize the cascade */
- if (offset) {
- if (request_irq(offset, no_action, SA_INTERRUPT,
- "82c59 cascade", NULL))
- printk(KERN_ERR "Unable to get OpenPIC IRQ 0 for cascaden");
- }
- openpic_set_priority(0);
- openpic_disable_8259_pass_through();
- ppc64_boot_msg(0x25, "OpenPic Done");
- }
- void openpic_setup_ISU(int isu_num, unsigned long addr)
- {
- if (isu_num >= OPENPIC_MAX_ISU)
- return;
- ISU[isu_num] = (OpenPIC_SourcePtr) __ioremap(addr, 0x400, _PAGE_NO_CACHE);
- if (isu_num >= NumISUs)
- NumISUs = isu_num + 1;
- }
- void find_ISUs(void)
- {
- /* Use /interrupt-controller/reg and
- * /interrupt-controller/interrupt-ranges from OF device tree
- * the ISU array is setup in chrp_pci.c in ibm_add_bridges
- * as a result
- * -- tgall
- */
- /* basically each ISU is a bus, and this assumes that
- * open_pic_isu_count interrupts per bus are possible
- * ISU == Interrupt Source
- */
- NumSources = NumISUs * 0x10;
- openpic_vec_ipi = NumSources + open_pic_irq_offset;
- openpic_vec_timer = openpic_vec_ipi + OPENPIC_NUM_IPI;
- openpic_vec_spurious = openpic_vec_timer + OPENPIC_NUM_TIMERS;
- }
- static inline void openpic_reset(void)
- {
- openpic_setfield(&OpenPIC->Global.Global_Configuration0,
- OPENPIC_CONFIG_RESET);
- }
- static inline void openpic_enable_8259_pass_through(void)
- {
- openpic_clearfield(&OpenPIC->Global.Global_Configuration0,
- OPENPIC_CONFIG_8259_PASSTHROUGH_DISABLE);
- }
- static void openpic_disable_8259_pass_through(void)
- {
- openpic_setfield(&OpenPIC->Global.Global_Configuration0,
- OPENPIC_CONFIG_8259_PASSTHROUGH_DISABLE);
- }
- /*
- * Find out the current interrupt
- */
- static u_int openpic_irq(void)
- {
- u_int vec;
- DECL_THIS_CPU;
- CHECK_THIS_CPU;
- vec = openpic_readfield(&OpenPIC->THIS_CPU.Interrupt_Acknowledge,
- OPENPIC_VECTOR_MASK);
- return vec;
- }
- static void openpic_eoi(void)
- {
- DECL_THIS_CPU;
- CHECK_THIS_CPU;
- openpic_write(&OpenPIC->THIS_CPU.EOI, 0);
- /* Handle PCI write posting */
- (void)openpic_read(&OpenPIC->THIS_CPU.EOI);
- }
- static inline u_int openpic_get_priority(void)
- {
- DECL_THIS_CPU;
- CHECK_THIS_CPU;
- return openpic_readfield(&OpenPIC->THIS_CPU.Current_Task_Priority,
- OPENPIC_CURRENT_TASK_PRIORITY_MASK);
- }
- static void openpic_set_priority(u_int pri)
- {
- DECL_THIS_CPU;
- CHECK_THIS_CPU;
- check_arg_pri(pri);
- openpic_writefield(&OpenPIC->THIS_CPU.Current_Task_Priority,
- OPENPIC_CURRENT_TASK_PRIORITY_MASK, pri);
- }
- /*
- * Get/set the spurious vector
- */
- static inline u_int openpic_get_spurious(void)
- {
- return openpic_readfield(&OpenPIC->Global.Spurious_Vector,
- OPENPIC_VECTOR_MASK);
- }
- static void openpic_set_spurious(u_int vec)
- {
- check_arg_vec(vec);
- openpic_writefield(&OpenPIC->Global.Spurious_Vector, OPENPIC_VECTOR_MASK,
- vec);
- }
- /*
- * Convert a cpu mask from logical to physical cpu numbers.
- */
- static inline u32 physmask(u32 cpumask)
- {
- int i;
- u32 mask = 0;
- for (i = 0; i < smp_num_cpus; ++i, cpumask >>= 1)
- mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
- return mask;
- }
- void openpic_init_processor(u_int cpumask)
- {
- openpic_write(&OpenPIC->Global.Processor_Initialization,
- physmask(cpumask));
- }
- #ifdef CONFIG_SMP
- /*
- * Initialize an interprocessor interrupt (and disable it)
- *
- * ipi: OpenPIC interprocessor interrupt number
- * pri: interrupt source priority
- * vec: the vector it will produce
- */
- static void __init openpic_initipi(u_int ipi, u_int pri, u_int vec)
- {
- check_arg_ipi(ipi);
- check_arg_pri(pri);
- check_arg_vec(vec);
- openpic_safe_writefield_IPI(&OpenPIC->Global.IPI_Vector_Priority(ipi),
- OPENPIC_PRIORITY_MASK | OPENPIC_VECTOR_MASK,
- (pri << OPENPIC_PRIORITY_SHIFT) | vec);
- }
- /*
- * Send an IPI to one or more CPUs
- *
- * Externally called, however, it takes an IPI number (0...OPENPIC_NUM_IPI)
- * and not a system-wide interrupt number
- */
- void openpic_cause_IPI(u_int ipi, u_int cpumask)
- {
- DECL_THIS_CPU;
- CHECK_THIS_CPU;
- check_arg_ipi(ipi);
- openpic_write(&OpenPIC->THIS_CPU.IPI_Dispatch(ipi),
- physmask(cpumask));
- }
- void openpic_request_IPIs(void)
- {
- int i;
-
- /*
- * Make sure this matches what is defined in smp.c for
- * smp_message_{pass|recv}() or what shows up in
- * /proc/interrupts will be wrong!!! --Troy */
-
- if (OpenPIC == NULL)
- return;
- request_irq(openpic_vec_ipi,
- openpic_ipi_action, 0, "IPI0 (call function)", 0);
- request_irq(openpic_vec_ipi+1,
- openpic_ipi_action, 0, "IPI1 (reschedule)", 0);
- request_irq(openpic_vec_ipi+2,
- openpic_ipi_action, 0, "IPI2 (invalidate tlb)", 0);
- request_irq(openpic_vec_ipi+3,
- openpic_ipi_action, 0, "IPI3 (xmon break)", 0);
- for ( i = 0; i < OPENPIC_NUM_IPI ; i++ )
- openpic_enable_ipi(openpic_vec_ipi+i);
- }
- /*
- * Do per-cpu setup for SMP systems.
- *
- * Get IPI's working and start taking interrupts.
- * -- Cort
- */
- static spinlock_t openpic_setup_lock __initdata = SPIN_LOCK_UNLOCKED;
- void __init do_openpic_setup_cpu(void)
- {
- #ifdef CONFIG_IRQ_ALL_CPUS
- int i;
- u32 msk = 1 << hard_smp_processor_id();
- #endif
- spin_lock(&openpic_setup_lock);
- #ifdef CONFIG_IRQ_ALL_CPUS
- /* let the openpic know we want intrs. default affinity
- * is 0xffffffff until changed via /proc
- * That's how it's done on x86. If we want it differently, then
- * we should make sure we also change the default values of irq_affinity
- * in irq.c.
- */
- for (i = 0; i < NumSources ; i++)
- openpic_mapirq(i, openpic_read(&GET_ISU(i).Destination) | msk);
- #endif /* CONFIG_IRQ_ALL_CPUS */
- openpic_set_priority(0);
- spin_unlock(&openpic_setup_lock);
- }
- #endif /* CONFIG_SMP */
- /*
- * Initialize a timer interrupt (and disable it)
- *
- * timer: OpenPIC timer number
- * pri: interrupt source priority
- * vec: the vector it will produce
- */
- static void __init openpic_inittimer(u_int timer, u_int pri, u_int vec)
- {
- check_arg_timer(timer);
- check_arg_pri(pri);
- check_arg_vec(vec);
- openpic_safe_writefield(&OpenPIC->Global.Timer[timer].Vector_Priority,
- OPENPIC_PRIORITY_MASK | OPENPIC_VECTOR_MASK,
- (pri << OPENPIC_PRIORITY_SHIFT) | vec);
- }
- /*
- * Map a timer interrupt to one or more CPUs
- */
- static void __init openpic_maptimer(u_int timer, u_int cpumask)
- {
- check_arg_timer(timer);
- openpic_write(&OpenPIC->Global.Timer[timer].Destination,
- physmask(cpumask));
- }
- /*
- *
- * All functions below take an offset'ed irq argument
- *
- */
- /*
- * Enable/disable an external interrupt source
- *
- * Externally called, irq is an offseted system-wide interrupt number
- */
- static void openpic_enable_irq(u_int irq)
- {
- unsigned int loops = 100000;
- check_arg_irq(irq);
- openpic_clearfield(&GET_ISU(irq - open_pic_irq_offset).Vector_Priority, OPENPIC_MASK);
- /* make sure mask gets to controller before we return to user */
- do {
- if (!loops--) {
- printk(KERN_ERR "openpic_enable_irq timeoutn");
- break;
- }
- mb(); /* sync is probably useless here */
- } while(openpic_readfield(&GET_ISU(irq - open_pic_irq_offset).Vector_Priority,
- OPENPIC_MASK));
- }
- static void openpic_disable_irq(u_int irq)
- {
- u32 vp;
- unsigned int loops = 100000;
-
- check_arg_irq(irq);
- openpic_setfield(&GET_ISU(irq - open_pic_irq_offset).Vector_Priority, OPENPIC_MASK);
- /* make sure mask gets to controller before we return to user */
- do {
- if (!loops--) {
- printk(KERN_ERR "openpic_disable_irq timeoutn");
- break;
- }
- mb(); /* sync is probably useless here */
- vp = openpic_readfield(&GET_ISU(irq - open_pic_irq_offset).Vector_Priority,
- OPENPIC_MASK | OPENPIC_ACTIVITY);
- } while((vp & OPENPIC_ACTIVITY) && !(vp & OPENPIC_MASK));
- }
- #ifdef CONFIG_SMP
- /*
- * Enable/disable an IPI interrupt source
- *
- * Externally called, irq is an offseted system-wide interrupt number
- */
- void openpic_enable_ipi(u_int irq)
- {
- irq -= openpic_vec_ipi;
- check_arg_ipi(irq);
- openpic_clearfield_IPI(&OpenPIC->Global.IPI_Vector_Priority(irq), OPENPIC_MASK);
- }
- void openpic_disable_ipi(u_int irq)
- {
- /* NEVER disable an IPI... that's just plain wrong! */
- }
- #endif
- /*
- * Initialize an interrupt source (and disable it!)
- *
- * irq: OpenPIC interrupt number
- * pri: interrupt source priority
- * vec: the vector it will produce
- * pol: polarity (1 for positive, 0 for negative)
- * sense: 1 for level, 0 for edge
- */
- static void openpic_initirq(u_int irq, u_int pri, u_int vec, int pol, int sense)
- {
- openpic_safe_writefield(&GET_ISU(irq).Vector_Priority,
- OPENPIC_PRIORITY_MASK | OPENPIC_VECTOR_MASK |
- OPENPIC_SENSE_MASK | OPENPIC_POLARITY_MASK,
- (pri << OPENPIC_PRIORITY_SHIFT) | vec |
- (pol ? OPENPIC_POLARITY_POSITIVE :
- OPENPIC_POLARITY_NEGATIVE) |
- (sense ? OPENPIC_SENSE_LEVEL : OPENPIC_SENSE_EDGE));
- }
- /*
- * Map an interrupt source to one or more CPUs
- */
- static void openpic_mapirq(u_int irq, u_int physmask)
- {
- openpic_write(&GET_ISU(irq).Destination, physmask);
- }
- /*
- * Set the sense for an interrupt source (and disable it!)
- *
- * sense: 1 for level, 0 for edge
- */
- static inline void openpic_set_sense(u_int irq, int sense)
- {
- openpic_safe_writefield(&GET_ISU(irq).Vector_Priority,
- OPENPIC_SENSE_LEVEL,
- (sense ? OPENPIC_SENSE_LEVEL : 0));
- }
- static void openpic_end_irq(unsigned int irq_nr)
- {
- if ((irq_desc[irq_nr].status & IRQ_LEVEL) != 0)
- openpic_eoi();
- }
- static void openpic_set_affinity(unsigned int irq_nr, unsigned long cpumask)
- {
- openpic_mapirq(irq_nr - open_pic_irq_offset, physmask(cpumask));
- }
- #ifdef CONFIG_SMP
- static void openpic_end_ipi(unsigned int irq_nr)
- {
- /* IPIs are marked IRQ_PER_CPU. This has the side effect of
- * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
- * applying to them. We EOI them late to avoid re-entering.
- * however, I'm wondering if we could simply let them have the
- * SA_INTERRUPT flag and let them execute with all interrupts OFF.
- * This would have the side effect of either running cross-CPU
- * functions with interrupts off, or we can re-enable them explicitely
- * with a __sti() in smp_call_function_interrupt(), since
- * smp_call_function() is protected by a spinlock.
- * Or maybe we shouldn't set the IRQ_PER_CPU flag on cross-CPU
- * function calls IPI at all but that would make a special case.
- */
- openpic_eoi();
- }
- static void openpic_ipi_action(int cpl, void *dev_id, struct pt_regs *regs)
- {
- smp_message_recv(cpl-openpic_vec_ipi, regs);
- }
- #endif /* CONFIG_SMP */
- int openpic_get_irq(struct pt_regs *regs)
- {
- extern int i8259_irq(int cpu);
- int irq = openpic_irq();
- /* Management of the cascade should be moved out of here */
- if (open_pic_irq_offset && irq == open_pic_irq_offset)
- {
- /*
- * This magic address generates a PCI IACK cycle.
- */
- if ( chrp_int_ack_special )
- irq = *chrp_int_ack_special;
- else
- irq = i8259_irq( smp_processor_id() );
- openpic_eoi();
- }
- if (irq == openpic_vec_spurious)
- irq = -1;
- return irq;
- }