/* * 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/types.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/sysdev.h> #include <linux/errno.h> #include <asm/ptrace.h> #include <asm/signal.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/sections.h> #include <asm/open_pic.h> #include <asm/i8259.h> #include <asm/machdep.h> #include "open_pic_defs.h" #if defined(CONFIG_PRPMC800) #define OPENPIC_BIG_ENDIAN #endif void __iomem *OpenPIC_Addr; static volatile struct OpenPIC __iomem *OpenPIC = NULL; /* * We define OpenPIC_InitSenses table thusly: * bit 0x1: sense, 0 for edge and 1 for level. * bit 0x2: polarity, 0 for negative, 1 for positive. */ u_int OpenPIC_NumInitSenses __initdata = 0; u_char *OpenPIC_InitSenses __initdata = NULL; extern int use_of_interrupt_tree; static u_int NumProcessors; static u_int NumSources; static int open_pic_irq_offset; static volatile OpenPIC_Source __iomem *ISR[NR_IRQS]; static int openpic_cascade_irq = -1; static int (*openpic_cascade_fn)(void); /* Global Operations */ static void openpic_disable_8259_pass_through(void); static void openpic_set_spurious(u_int vector); #ifdef CONFIG_SMP /* Interprocessor Interrupts */ static void openpic_initipi(u_int ipi, u_int pri, u_int vector); static irqreturn_t openpic_ipi_action(int cpl, void *dev_id); #endif /* Timer Interrupts */ static void openpic_inittimer(u_int timer, u_int pri, u_int vector); static void openpic_maptimer(u_int timer, cpumask_t cpumask); /* Interrupt Sources */ static void openpic_enable_irq(u_int irq); static void openpic_disable_irq(u_int irq); static void openpic_initirq(u_int irq, u_int pri, u_int vector, int polarity, int is_level); static void openpic_mapirq(u_int irq, cpumask_t cpumask, cpumask_t keepmask); /* * These functions are not used but the code is kept here * for completeness and future reference. */ #ifdef notused static void openpic_enable_8259_pass_through(void); static u_int openpic_get_spurious(void); static void openpic_set_sense(u_int irq, int sense); #endif /* notused */ /* * Description of the openpic for the higher-level irq code */ static void openpic_end_irq(unsigned int irq_nr); static void openpic_ack_irq(unsigned int irq_nr); static void openpic_set_affinity(unsigned int irq_nr, cpumask_t cpumask); struct hw_interrupt_type open_pic = { .typename = " OpenPIC ", .enable = openpic_enable_irq, .disable = openpic_disable_irq, .ack = openpic_ack_irq, .end = openpic_end_irq, .set_affinity = openpic_set_affinity, }; #ifdef CONFIG_SMP static void openpic_end_ipi(unsigned int irq_nr); static void openpic_ack_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 = { .typename = " OpenPIC ", .enable = openpic_enable_ipi, .disable = openpic_disable_ipi, .ack = openpic_ack_ipi, .end = openpic_end_ipi, }; #endif /* CONFIG_SMP */ /* * Accesses to the current processor's openpic registers */ #ifdef CONFIG_SMP #define THIS_CPU Processor[cpu] #define DECL_THIS_CPU int cpu = smp_hw_index[smp_processor_id()] #define CHECK_THIS_CPU check_arg_cpu(cpu) #else #define THIS_CPU Processor[0] #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("open_pic.c:%d: invalid ipi %d\n", __LINE__, ipi); #define check_arg_timer(timer) \ if (timer < 0 || timer >= OPENPIC_NUM_TIMERS) \ printk("open_pic.c:%d: invalid timer %d\n", __LINE__, timer); #define check_arg_vec(vec) \ if (vec < 0 || vec >= OPENPIC_NUM_VECTORS) \ printk("open_pic.c:%d: invalid vector %d\n", __LINE__, vec); #define check_arg_pri(pri) \ if (pri < 0 || pri >= OPENPIC_NUM_PRI) \ printk("open_pic.c:%d: invalid priority %d\n", __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 */ #define check_arg_irq(irq) \ if (irq < open_pic_irq_offset || irq >= NumSources+open_pic_irq_offset \ || ISR[irq - open_pic_irq_offset] == 0) { \ printk("open_pic.c:%d: invalid irq %d\n", __LINE__, irq); \ dump_stack(); } #define check_arg_cpu(cpu) \ if (cpu < 0 || cpu >= NumProcessors){ \ printk("open_pic.c:%d: invalid cpu %d\n", __LINE__, cpu); \ dump_stack(); } #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 u_int openpic_read(volatile u_int __iomem *addr) { u_int val; #ifdef OPENPIC_BIG_ENDIAN val = in_be32(addr); #else val = in_le32(addr); #endif return val; } static inline void openpic_write(volatile u_int __iomem *addr, u_int val) { #ifdef OPENPIC_BIG_ENDIAN out_be32(addr, val); #else out_le32(addr, val); #endif } static inline u_int openpic_readfield(volatile u_int __iomem *addr, u_int mask) { u_int val = openpic_read(addr); return val & mask; } inline void openpic_writefield(volatile u_int __iomem *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 __iomem *addr, u_int mask) { openpic_writefield(addr, mask, 0); } static inline void openpic_setfield(volatile u_int __iomem *addr, u_int mask) { openpic_writefield(addr, mask, mask); } static void openpic_safe_writefield(volatile u_int __iomem *addr, u_int mask, u_int field) { openpic_setfield(addr, OPENPIC_MASK); while (openpic_read(addr) & OPENPIC_ACTIVITY); openpic_writefield(addr, mask | OPENPIC_MASK, field | OPENPIC_MASK); } #ifdef CONFIG_SMP /* yes this is right ... bug, feature, you decide! -- tgall */ u_int openpic_read_IPI(volatile u_int __iomem * addr) { u_int val = 0; #if defined(OPENPIC_BIG_ENDIAN) val = in_be32(addr); #else val = in_le32(addr); #endif return val; } /* because of the power3 be / le above, this is needed */ inline void openpic_writefield_IPI(volatile u_int __iomem * 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 __iomem *addr, u_int mask) { openpic_writefield_IPI(addr, mask, 0); } static inline void openpic_setfield_IPI(volatile u_int __iomem *addr, u_int mask) { openpic_writefield_IPI(addr, mask, mask); } static void openpic_safe_writefield_IPI(volatile u_int __iomem *addr, u_int mask, u_int field) { 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); openpic_writefield_IPI(addr, mask | OPENPIC_MASK, field | OPENPIC_MASK); } #endif /* CONFIG_SMP */ #ifdef CONFIG_EPIC_SERIAL_MODE /* On platforms that may use EPIC serial mode, the default is enabled. */ int epic_serial_mode = 1; static void __init openpic_eicr_set_clk(u_int clkval) { openpic_writefield(&OpenPIC->Global.Global_Configuration1, OPENPIC_EICR_S_CLK_MASK, (clkval << 28)); } static void __init openpic_enable_sie(void) { openpic_setfield(&OpenPIC->Global.Global_Configuration1, OPENPIC_EICR_SIE); } #endif #if defined(CONFIG_EPIC_SERIAL_MODE) static void openpic_reset(void) { openpic_setfield(&OpenPIC->Global.Global_Configuration0, OPENPIC_CONFIG_RESET); while (openpic_readfield(&OpenPIC->Global.Global_Configuration0, OPENPIC_CONFIG_RESET)) mb(); } #endif void __init openpic_set_sources(int first_irq, int num_irqs, void __iomem *first_ISR) { volatile OpenPIC_Source __iomem *src = first_ISR; int i, last_irq; last_irq = first_irq + num_irqs; if (last_irq > NumSources) NumSources = last_irq; if (src == 0) src = &((struct OpenPIC __iomem *)OpenPIC_Addr)->Source[first_irq]; for (i = first_irq; i < last_irq; ++i, ++src) ISR[i] = src; } /* * The `offset' parameter defines where the interrupts handled by the * OpenPIC start in the space of interrupt numbers that the kernel knows * about. In other words, the OpenPIC's IRQ0 is numbered `offset' in the * kernel's interrupt numbering scheme. * We assume there is only one OpenPIC. */ void __init openpic_init(int offset) { u_int t, i; u_int timerfreq; const char *version; if (!OpenPIC_Addr) { printk("No OpenPIC found !\n"); return; } OpenPIC = (volatile struct OpenPIC __iomem *)OpenPIC_Addr; #ifdef CONFIG_EPIC_SERIAL_MODE /* Have to start from ground zero. */ openpic_reset(); #endif if (ppc_md.progress) ppc_md.progress("openpic: enter", 0x122); 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; if (NumSources == 0) openpic_set_sources(0, ((t & OPENPIC_FEATURE_LAST_SOURCE_MASK) >> OPENPIC_FEATURE_LAST_SOURCE_SHIFT) + 1, NULL); printk("OpenPIC Version %s (%d CPUs and %d IRQ sources) at %p\n", version, NumProcessors, NumSources, OpenPIC); timerfreq = openpic_read(&OpenPIC->Global.Timer_Frequency); if (timerfreq) printk("OpenPIC timer frequency is %d.%06d MHz\n", timerfreq / 1000000, timerfreq % 1000000); open_pic_irq_offset = offset; /* Initialize timer interrupts */ if ( ppc_md.progress ) ppc_md.progress("openpic: timer",0x3ba); for (i = 0; i < OPENPIC_NUM_TIMERS; i++) { /* Disabled, Priority 0 */ openpic_inittimer(i, 0, OPENPIC_VEC_TIMER+i+offset); /* No processor */ openpic_maptimer(i, CPU_MASK_NONE); } #ifdef CONFIG_SMP /* Initialize IPI interrupts */ if ( ppc_md.progress ) ppc_md.progress("openpic: ipi",0x3bb); for (i = 0; i < OPENPIC_NUM_IPI; i++) { /* Disabled, increased priorities 10..13 */ openpic_initipi(i, OPENPIC_PRIORITY_IPI_BASE+i, OPENPIC_VEC_IPI+i+offset); /* IPIs are per-CPU */ irq_desc[OPENPIC_VEC_IPI+i+offset].status |= IRQ_PER_CPU; irq_desc[OPENPIC_VEC_IPI+i+offset].chip = &open_pic_ipi; } #endif /* Initialize external interrupts */ if (ppc_md.progress) ppc_md.progress("openpic: external",0x3bc); openpic_set_priority(0xf); /* Init all external sources, including possibly the cascade. */ for (i = 0; i < NumSources; i++) { int sense; if (ISR[i] == 0) continue; /* the bootloader may have left it enabled (bad !) */ openpic_disable_irq(i+offset); sense = (i < OpenPIC_NumInitSenses)? OpenPIC_InitSenses[i]: \ (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE); if (sense & IRQ_SENSE_MASK) irq_desc[i+offset].status = IRQ_LEVEL; /* Enabled, Default priority */ openpic_initirq(i, OPENPIC_PRIORITY_DEFAULT, i+offset, (sense & IRQ_POLARITY_MASK), (sense & IRQ_SENSE_MASK)); /* Processor 0 */ openpic_mapirq(i, CPU_MASK_CPU0, CPU_MASK_NONE); } /* Init descriptors */ for (i = offset; i < NumSources + offset; i++) irq_desc[i].chip = &open_pic; /* Initialize the spurious interrupt */ if (ppc_md.progress) ppc_md.progress("openpic: spurious",0x3bd); openpic_set_spurious(OPENPIC_VEC_SPURIOUS); openpic_disable_8259_pass_through(); #ifdef CONFIG_EPIC_SERIAL_MODE if (epic_serial_mode) { openpic_eicr_set_clk(7); /* Slowest value until we know better */ openpic_enable_sie(); } #endif openpic_set_priority(0); if (ppc_md.progress) ppc_md.progress("openpic: exit",0x222); } #ifdef notused static void openpic_enable_8259_pass_through(void) { openpic_clearfield(&OpenPIC->Global.Global_Configuration0, OPENPIC_CONFIG_8259_PASSTHROUGH_DISABLE); } #endif /* notused */ static void openpic_disable_8259_pass_through(void) { openpic_setfield(&OpenPIC->Global.Global_Configuration0, OPENPIC_CONFIG_8259_PASSTHROUGH_DISABLE); } /* * Find out the current interrupt */ 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; } 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); } 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); } 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 */ #ifdef notused static u_int openpic_get_spurious(void) { return openpic_readfield(&OpenPIC->Global.Spurious_Vector, OPENPIC_VECTOR_MASK); } #endif /* notused */ static void openpic_set_spurious(u_int vec) { check_arg_vec(vec); openpic_writefield(&OpenPIC->Global.Spurious_Vector, OPENPIC_VECTOR_MASK, vec); } #ifdef CONFIG_SMP /* * Convert a cpu mask from logical to physical cpu numbers. */ static inline cpumask_t physmask(cpumask_t cpumask) { int i; cpumask_t mask = CPU_MASK_NONE; cpus_and(cpumask, cpu_online_map, cpumask); for (i = 0; i < NR_CPUS; i++) if (cpu_isset(i, cpumask)) cpu_set(smp_hw_index[i], mask); return mask; } #else #define physmask(cpumask) (cpumask) #endif void openpic_reset_processor_phys(u_int mask) { openpic_write(&OpenPIC->Global.Processor_Initialization, mask); } #if defined(CONFIG_SMP) || defined(CONFIG_PM) static DEFINE_SPINLOCK(openpic_setup_lock); #endif #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, cpumask_t cpumask) { DECL_THIS_CPU; CHECK_THIS_CPU; check_arg_ipi(ipi); openpic_write(&OpenPIC->THIS_CPU.IPI_Dispatch(ipi), cpus_addr(physmask(cpumask))[0]); } 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; /* * IPIs are marked IRQF_DISABLED as they must run with irqs * disabled */ request_irq(OPENPIC_VEC_IPI+open_pic_irq_offset, openpic_ipi_action, IRQF_DISABLED, "IPI0 (call function)", NULL); request_irq(OPENPIC_VEC_IPI+open_pic_irq_offset+1, openpic_ipi_action, IRQF_DISABLED, "IPI1 (reschedule)", NULL); request_irq(OPENPIC_VEC_IPI+open_pic_irq_offset+2, openpic_ipi_action, IRQF_DISABLED, "IPI2 (invalidate tlb)", NULL); request_irq(OPENPIC_VEC_IPI+open_pic_irq_offset+3, openpic_ipi_action, IRQF_DISABLED, "IPI3 (xmon break)", NULL); for ( i = 0; i < OPENPIC_NUM_IPI ; i++ ) openpic_enable_ipi(OPENPIC_VEC_IPI+open_pic_irq_offset+i); } /* * Do per-cpu setup for SMP systems. * * Get IPI's working and start taking interrupts. * -- Cort */ void __devinit do_openpic_setup_cpu(void) { #ifdef CONFIG_IRQ_ALL_CPUS int i; cpumask_t msk = CPU_MASK_NONE; #endif spin_lock(&openpic_setup_lock); #ifdef CONFIG_IRQ_ALL_CPUS cpu_set(smp_hw_index[smp_processor_id()], msk); /* 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_desc[].affinity in irq.c. */ for (i = 0; i < NumSources; i++) openpic_mapirq(i, msk, CPU_MASK_ALL); #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, cpumask_t cpumask) { cpumask_t phys = physmask(cpumask); check_arg_timer(timer); openpic_write(&OpenPIC->Global.Timer[timer].Destination, cpus_addr(phys)[0]); } /* * Change the priority of an interrupt */ void __init openpic_set_irq_priority(u_int irq, u_int pri) { check_arg_irq(irq); openpic_safe_writefield(&ISR[irq - open_pic_irq_offset]->Vector_Priority, OPENPIC_PRIORITY_MASK, pri << OPENPIC_PRIORITY_SHIFT); } /* * Initalize the interrupt source which will generate an NMI. * This raises the interrupt's priority from 8 to 9. * * irq: The logical IRQ which generates an NMI. */ void __init openpic_init_nmi_irq(u_int irq) { check_arg_irq(irq); openpic_set_irq_priority(irq, OPENPIC_PRIORITY_NMI); } /* * * All functions below take an offset'ed irq argument * */ /* * Hookup a cascade to the OpenPIC. */ static struct irqaction openpic_cascade_irqaction = { .handler = no_action, .flags = IRQF_DISABLED, .mask = CPU_MASK_NONE, }; void __init openpic_hookup_cascade(u_int irq, char *name, int (*cascade_fn)(void)) { openpic_cascade_irq = irq; openpic_cascade_fn = cascade_fn; if (setup_irq(irq, &openpic_cascade_irqaction)) printk("Unable to get OpenPIC IRQ %d for cascade\n", irq - open_pic_irq_offset); } /* * Enable/disable an external interrupt source * * Externally called, irq is an offseted system-wide interrupt number */ static void openpic_enable_irq(u_int irq) { volatile u_int __iomem *vpp; check_arg_irq(irq); vpp = &ISR[irq - open_pic_irq_offset]->Vector_Priority; openpic_clearfield(vpp, OPENPIC_MASK); /* make sure mask gets to controller before we return to user */ do { mb(); /* sync is probably useless here */ } while (openpic_readfield(vpp, OPENPIC_MASK)); } static void openpic_disable_irq(u_int irq) { volatile u_int __iomem *vpp; u32 vp; check_arg_irq(irq); vpp = &ISR[irq - open_pic_irq_offset]->Vector_Priority; openpic_setfield(vpp, OPENPIC_MASK); /* make sure mask gets to controller before we return to user */ do { mb(); /* sync is probably useless here */ vp = openpic_readfield(vpp, 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+open_pic_irq_offset); check_arg_ipi(irq); openpic_clearfield_IPI(&OpenPIC->Global.IPI_Vector_Priority(irq), OPENPIC_MASK); } void openpic_disable_ipi(u_int irq) { irq -= (OPENPIC_VEC_IPI+open_pic_irq_offset); check_arg_ipi(irq); openpic_setfield_IPI(&OpenPIC->Global.IPI_Vector_Priority(irq), OPENPIC_MASK); } #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 __init openpic_initirq(u_int irq, u_int pri, u_int vec, int pol, int sense) { openpic_safe_writefield(&ISR[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, cpumask_t physmask, cpumask_t keepmask) { if (ISR[irq] == 0) return; if (!cpus_empty(keepmask)) { cpumask_t irqdest = { .bits[0] = openpic_read(&ISR[irq]->Destination) }; cpus_and(irqdest, irqdest, keepmask); cpus_or(physmask, physmask, irqdest); } openpic_write(&ISR[irq]->Destination, cpus_addr(physmask)[0]); } #ifdef notused /* * Set the sense for an interrupt source (and disable it!) * * sense: 1 for level, 0 for edge */ static void openpic_set_sense(u_int irq, int sense) { if (ISR[irq] != 0) openpic_safe_writefield(&ISR[irq]->Vector_Priority, OPENPIC_SENSE_LEVEL, (sense ? OPENPIC_SENSE_LEVEL : 0)); } #endif /* notused */ /* No spinlocks, should not be necessary with the OpenPIC * (1 register = 1 interrupt and we have the desc lock). */ static void openpic_ack_irq(unsigned int irq_nr) { #ifdef __SLOW_VERSION__ openpic_disable_irq(irq_nr); openpic_eoi(); #else if ((irq_desc[irq_nr].status & IRQ_LEVEL) == 0) openpic_eoi(); #endif } static void openpic_end_irq(unsigned int irq_nr) { #ifdef __SLOW_VERSION__ if (!(irq_desc[irq_nr].status & (IRQ_DISABLED|IRQ_INPROGRESS)) && irq_desc[irq_nr].action) openpic_enable_irq(irq_nr); #else if ((irq_desc[irq_nr].status & IRQ_LEVEL) != 0) openpic_eoi(); #endif } static void openpic_set_affinity(unsigned int irq_nr, cpumask_t cpumask) { openpic_mapirq(irq_nr - open_pic_irq_offset, physmask(cpumask), CPU_MASK_NONE); } #ifdef CONFIG_SMP static void openpic_ack_ipi(unsigned int irq_nr) { openpic_eoi(); } static void openpic_end_ipi(unsigned int irq_nr) { } static irqreturn_t openpic_ipi_action(int cpl, void *dev_id) { smp_message_recv(cpl-OPENPIC_VEC_IPI-open_pic_irq_offset); return IRQ_HANDLED; } #endif /* CONFIG_SMP */ int openpic_get_irq(void) { int irq = openpic_irq(); /* * Check for the cascade interrupt and call the cascaded * interrupt controller function (usually i8259_irq) if so. * This should move to irq.c eventually. -- paulus */ if (irq == openpic_cascade_irq && openpic_cascade_fn != NULL) { int cirq = openpic_cascade_fn(); /* Allow for the cascade being shared with other devices */ if (cirq != -1) { irq = cirq; openpic_eoi(); } } else if (irq == OPENPIC_VEC_SPURIOUS) irq = -1; return irq; } #ifdef CONFIG_SMP void smp_openpic_message_pass(int target, int msg) { cpumask_t mask = CPU_MASK_ALL; /* make sure we're sending something that translates to an IPI */ if (msg > 0x3) { printk("SMP %d: smp_message_pass: unknown msg %d\n", smp_processor_id(), msg); return; } switch (target) { case MSG_ALL: openpic_cause_IPI(msg, mask); break; case MSG_ALL_BUT_SELF: cpu_clear(smp_processor_id(), mask); openpic_cause_IPI(msg, mask); break; default: openpic_cause_IPI(msg, cpumask_of_cpu(target)); break; } } #endif /* CONFIG_SMP */ #ifdef CONFIG_PM /* * We implement the IRQ controller as a sysdev and put it * to sleep at powerdown stage (the callback is named suspend, * but it's old semantics, for the Device Model, it's really * powerdown). The possible problem is that another sysdev that * happens to be suspend after this one will have interrupts off, * that may be an issue... For now, this isn't an issue on pmac * though... */ static u32 save_ipi_vp[OPENPIC_NUM_IPI]; static u32 save_irq_src_vp[OPENPIC_MAX_SOURCES]; static u32 save_irq_src_dest[OPENPIC_MAX_SOURCES]; static u32 save_cpu_task_pri[OPENPIC_MAX_PROCESSORS]; static int openpic_suspend_count; static void openpic_cached_enable_irq(u_int irq) { check_arg_irq(irq); save_irq_src_vp[irq - open_pic_irq_offset] &= ~OPENPIC_MASK; } static void openpic_cached_disable_irq(u_int irq) { check_arg_irq(irq); save_irq_src_vp[irq - open_pic_irq_offset] |= OPENPIC_MASK; } /* WARNING: Can be called directly by the cpufreq code with NULL parameter, * we need something better to deal with that... Maybe switch to S1 for * cpufreq changes */ int openpic_suspend(struct sys_device *sysdev, pm_message_t state) { int i; unsigned long flags; spin_lock_irqsave(&openpic_setup_lock, flags); if (openpic_suspend_count++ > 0) { spin_unlock_irqrestore(&openpic_setup_lock, flags); return 0; } openpic_set_priority(0xf); open_pic.enable = openpic_cached_enable_irq; open_pic.disable = openpic_cached_disable_irq; for (i=0; i<NumProcessors; i++) { save_cpu_task_pri[i] = openpic_read(&OpenPIC->Processor[i].Current_Task_Priority); openpic_writefield(&OpenPIC->Processor[i].Current_Task_Priority, OPENPIC_CURRENT_TASK_PRIORITY_MASK, 0xf); } for (i=0; i<OPENPIC_NUM_IPI; i++) save_ipi_vp[i] = openpic_read(&OpenPIC->Global.IPI_Vector_Priority(i)); for (i=0; i<NumSources; i++) { if (ISR[i] == 0) continue; save_irq_src_vp[i] = openpic_read(&ISR[i]->Vector_Priority) & ~OPENPIC_ACTIVITY; save_irq_src_dest[i] = openpic_read(&ISR[i]->Destination); } spin_unlock_irqrestore(&openpic_setup_lock, flags); return 0; } /* WARNING: Can be called directly by the cpufreq code with NULL parameter, * we need something better to deal with that... Maybe switch to S1 for * cpufreq changes */ int openpic_resume(struct sys_device *sysdev) { int i; unsigned long flags; u32 vppmask = OPENPIC_PRIORITY_MASK | OPENPIC_VECTOR_MASK | OPENPIC_SENSE_MASK | OPENPIC_POLARITY_MASK | OPENPIC_MASK; spin_lock_irqsave(&openpic_setup_lock, flags); if ((--openpic_suspend_count) > 0) { spin_unlock_irqrestore(&openpic_setup_lock, flags); return 0; } /* OpenPIC sometimes seem to need some time to be fully back up... */ do { openpic_set_spurious(OPENPIC_VEC_SPURIOUS); } while(openpic_readfield(&OpenPIC->Global.Spurious_Vector, OPENPIC_VECTOR_MASK) != OPENPIC_VEC_SPURIOUS); openpic_disable_8259_pass_through(); for (i=0; i<OPENPIC_NUM_IPI; i++) openpic_write(&OpenPIC->Global.IPI_Vector_Priority(i), save_ipi_vp[i]); for (i=0; i<NumSources; i++) { if (ISR[i] == 0) continue; openpic_write(&ISR[i]->Destination, save_irq_src_dest[i]); openpic_write(&ISR[i]->Vector_Priority, save_irq_src_vp[i]); /* make sure mask gets to controller before we return to user */ do { openpic_write(&ISR[i]->Vector_Priority, save_irq_src_vp[i]); } while (openpic_readfield(&ISR[i]->Vector_Priority, vppmask) != (save_irq_src_vp[i] & vppmask)); } for (i=0; i<NumProcessors; i++) openpic_write(&OpenPIC->Processor[i].Current_Task_Priority, save_cpu_task_pri[i]); open_pic.enable = openpic_enable_irq; open_pic.disable = openpic_disable_irq; openpic_set_priority(0); spin_unlock_irqrestore(&openpic_setup_lock, flags); return 0; } #endif /* CONFIG_PM */ static struct sysdev_class openpic_sysclass = { .name = "openpic", }; static struct sys_device device_openpic = { .id = 0, .cls = &openpic_sysclass, }; static struct sysdev_driver driver_openpic = { #ifdef CONFIG_PM .suspend = &openpic_suspend, .resume = &openpic_resume, #endif /* CONFIG_PM */ }; static int __init init_openpic_sysfs(void) { int rc; if (!OpenPIC_Addr) return -ENODEV; printk(KERN_DEBUG "Registering openpic with sysfs...\n"); rc = sysdev_class_register(&openpic_sysclass); if (rc) { printk(KERN_ERR "Failed registering openpic sys class\n"); return -ENODEV; } rc = sysdev_register(&device_openpic); if (rc) { printk(KERN_ERR "Failed registering openpic sys device\n"); return -ENODEV; } rc = sysdev_driver_register(&openpic_sysclass, &driver_openpic); if (rc) { printk(KERN_ERR "Failed registering openpic sys driver\n"); return -ENODEV; } return 0; } subsys_initcall(init_openpic_sysfs);