diff options
Diffstat (limited to 'arch/ppc/syslib/open_pic.c')
| -rw-r--r-- | arch/ppc/syslib/open_pic.c | 1087 |
1 files changed, 0 insertions, 1087 deletions
diff --git a/arch/ppc/syslib/open_pic.c b/arch/ppc/syslib/open_pic.c deleted file mode 100644 index 67dffe27b5c3..000000000000 --- a/arch/ppc/syslib/open_pic.c +++ /dev/null @@ -1,1087 +0,0 @@ -/* - * 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); - |