1087 lines
28 KiB
C
1087 lines
28 KiB
C
/*
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* Copyright (C) 1997 Geert Uytterhoeven
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/sysdev.h>
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#include <linux/errno.h>
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#include <asm/ptrace.h>
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#include <asm/signal.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/sections.h>
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#include <asm/open_pic.h>
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#include <asm/i8259.h>
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#include <asm/machdep.h>
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#include "open_pic_defs.h"
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#if defined(CONFIG_PRPMC800)
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#define OPENPIC_BIG_ENDIAN
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#endif
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void __iomem *OpenPIC_Addr;
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static volatile struct OpenPIC __iomem *OpenPIC = NULL;
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/*
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* We define OpenPIC_InitSenses table thusly:
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* bit 0x1: sense, 0 for edge and 1 for level.
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* bit 0x2: polarity, 0 for negative, 1 for positive.
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*/
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u_int OpenPIC_NumInitSenses __initdata = 0;
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u_char *OpenPIC_InitSenses __initdata = NULL;
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extern int use_of_interrupt_tree;
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static u_int NumProcessors;
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static u_int NumSources;
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static int open_pic_irq_offset;
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static volatile OpenPIC_Source __iomem *ISR[NR_IRQS];
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static int openpic_cascade_irq = -1;
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static int (*openpic_cascade_fn)(void);
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/* Global Operations */
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static void openpic_disable_8259_pass_through(void);
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static void openpic_set_spurious(u_int vector);
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#ifdef CONFIG_SMP
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/* Interprocessor Interrupts */
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static void openpic_initipi(u_int ipi, u_int pri, u_int vector);
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static irqreturn_t openpic_ipi_action(int cpl, void *dev_id);
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#endif
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/* Timer Interrupts */
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static void openpic_inittimer(u_int timer, u_int pri, u_int vector);
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static void openpic_maptimer(u_int timer, cpumask_t cpumask);
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/* Interrupt Sources */
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static void openpic_enable_irq(u_int irq);
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static void openpic_disable_irq(u_int irq);
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static void openpic_initirq(u_int irq, u_int pri, u_int vector, int polarity,
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int is_level);
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static void openpic_mapirq(u_int irq, cpumask_t cpumask, cpumask_t keepmask);
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/*
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* These functions are not used but the code is kept here
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* for completeness and future reference.
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*/
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#ifdef notused
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static void openpic_enable_8259_pass_through(void);
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static u_int openpic_get_spurious(void);
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static void openpic_set_sense(u_int irq, int sense);
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#endif /* notused */
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/*
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* Description of the openpic for the higher-level irq code
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*/
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static void openpic_end_irq(unsigned int irq_nr);
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static void openpic_ack_irq(unsigned int irq_nr);
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static void openpic_set_affinity(unsigned int irq_nr, cpumask_t cpumask);
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struct hw_interrupt_type open_pic = {
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.typename = " OpenPIC ",
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.enable = openpic_enable_irq,
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.disable = openpic_disable_irq,
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.ack = openpic_ack_irq,
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.end = openpic_end_irq,
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.set_affinity = openpic_set_affinity,
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};
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#ifdef CONFIG_SMP
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static void openpic_end_ipi(unsigned int irq_nr);
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static void openpic_ack_ipi(unsigned int irq_nr);
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static void openpic_enable_ipi(unsigned int irq_nr);
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static void openpic_disable_ipi(unsigned int irq_nr);
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struct hw_interrupt_type open_pic_ipi = {
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.typename = " OpenPIC ",
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.enable = openpic_enable_ipi,
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.disable = openpic_disable_ipi,
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.ack = openpic_ack_ipi,
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.end = openpic_end_ipi,
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};
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#endif /* CONFIG_SMP */
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/*
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* Accesses to the current processor's openpic registers
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*/
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#ifdef CONFIG_SMP
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#define THIS_CPU Processor[cpu]
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#define DECL_THIS_CPU int cpu = smp_hw_index[smp_processor_id()]
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#define CHECK_THIS_CPU check_arg_cpu(cpu)
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#else
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#define THIS_CPU Processor[0]
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#define DECL_THIS_CPU
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#define CHECK_THIS_CPU
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#endif /* CONFIG_SMP */
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#if 1
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#define check_arg_ipi(ipi) \
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if (ipi < 0 || ipi >= OPENPIC_NUM_IPI) \
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printk("open_pic.c:%d: invalid ipi %d\n", __LINE__, ipi);
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#define check_arg_timer(timer) \
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if (timer < 0 || timer >= OPENPIC_NUM_TIMERS) \
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printk("open_pic.c:%d: invalid timer %d\n", __LINE__, timer);
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#define check_arg_vec(vec) \
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if (vec < 0 || vec >= OPENPIC_NUM_VECTORS) \
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printk("open_pic.c:%d: invalid vector %d\n", __LINE__, vec);
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#define check_arg_pri(pri) \
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if (pri < 0 || pri >= OPENPIC_NUM_PRI) \
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printk("open_pic.c:%d: invalid priority %d\n", __LINE__, pri);
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/*
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* Print out a backtrace if it's out of range, since if it's larger than NR_IRQ's
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* data has probably been corrupted and we're going to panic or deadlock later
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* anyway --Troy
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*/
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#define check_arg_irq(irq) \
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if (irq < open_pic_irq_offset || irq >= NumSources+open_pic_irq_offset \
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|| ISR[irq - open_pic_irq_offset] == 0) { \
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printk("open_pic.c:%d: invalid irq %d\n", __LINE__, irq); \
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dump_stack(); }
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#define check_arg_cpu(cpu) \
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if (cpu < 0 || cpu >= NumProcessors){ \
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printk("open_pic.c:%d: invalid cpu %d\n", __LINE__, cpu); \
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dump_stack(); }
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#else
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#define check_arg_ipi(ipi) do {} while (0)
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#define check_arg_timer(timer) do {} while (0)
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#define check_arg_vec(vec) do {} while (0)
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#define check_arg_pri(pri) do {} while (0)
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#define check_arg_irq(irq) do {} while (0)
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#define check_arg_cpu(cpu) do {} while (0)
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#endif
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u_int openpic_read(volatile u_int __iomem *addr)
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{
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u_int val;
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#ifdef OPENPIC_BIG_ENDIAN
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val = in_be32(addr);
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#else
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val = in_le32(addr);
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#endif
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return val;
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}
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static inline void openpic_write(volatile u_int __iomem *addr, u_int val)
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{
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#ifdef OPENPIC_BIG_ENDIAN
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out_be32(addr, val);
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#else
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out_le32(addr, val);
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#endif
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}
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static inline u_int openpic_readfield(volatile u_int __iomem *addr, u_int mask)
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{
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u_int val = openpic_read(addr);
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return val & mask;
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}
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inline void openpic_writefield(volatile u_int __iomem *addr, u_int mask,
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u_int field)
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{
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u_int val = openpic_read(addr);
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openpic_write(addr, (val & ~mask) | (field & mask));
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}
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static inline void openpic_clearfield(volatile u_int __iomem *addr, u_int mask)
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{
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openpic_writefield(addr, mask, 0);
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}
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static inline void openpic_setfield(volatile u_int __iomem *addr, u_int mask)
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{
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openpic_writefield(addr, mask, mask);
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}
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static void openpic_safe_writefield(volatile u_int __iomem *addr, u_int mask,
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u_int field)
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{
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openpic_setfield(addr, OPENPIC_MASK);
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while (openpic_read(addr) & OPENPIC_ACTIVITY);
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openpic_writefield(addr, mask | OPENPIC_MASK, field | OPENPIC_MASK);
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}
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#ifdef CONFIG_SMP
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/* yes this is right ... bug, feature, you decide! -- tgall */
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u_int openpic_read_IPI(volatile u_int __iomem * addr)
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{
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u_int val = 0;
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#if defined(OPENPIC_BIG_ENDIAN)
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val = in_be32(addr);
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#else
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val = in_le32(addr);
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#endif
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return val;
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}
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/* because of the power3 be / le above, this is needed */
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inline void openpic_writefield_IPI(volatile u_int __iomem * addr, u_int mask, u_int field)
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{
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u_int val = openpic_read_IPI(addr);
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openpic_write(addr, (val & ~mask) | (field & mask));
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}
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static inline void openpic_clearfield_IPI(volatile u_int __iomem *addr, u_int mask)
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{
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openpic_writefield_IPI(addr, mask, 0);
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}
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static inline void openpic_setfield_IPI(volatile u_int __iomem *addr, u_int mask)
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{
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openpic_writefield_IPI(addr, mask, mask);
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}
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static void openpic_safe_writefield_IPI(volatile u_int __iomem *addr, u_int mask, u_int field)
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{
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openpic_setfield_IPI(addr, OPENPIC_MASK);
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/* wait until it's not in use */
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/* BenH: Is this code really enough ? I would rather check the result
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* and eventually retry ...
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*/
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while(openpic_read_IPI(addr) & OPENPIC_ACTIVITY);
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openpic_writefield_IPI(addr, mask | OPENPIC_MASK, field | OPENPIC_MASK);
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}
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#endif /* CONFIG_SMP */
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#ifdef CONFIG_EPIC_SERIAL_MODE
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/* On platforms that may use EPIC serial mode, the default is enabled. */
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int epic_serial_mode = 1;
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static void __init openpic_eicr_set_clk(u_int clkval)
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{
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openpic_writefield(&OpenPIC->Global.Global_Configuration1,
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OPENPIC_EICR_S_CLK_MASK, (clkval << 28));
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}
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static void __init openpic_enable_sie(void)
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{
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openpic_setfield(&OpenPIC->Global.Global_Configuration1,
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OPENPIC_EICR_SIE);
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}
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#endif
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#if defined(CONFIG_EPIC_SERIAL_MODE)
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static void openpic_reset(void)
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{
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openpic_setfield(&OpenPIC->Global.Global_Configuration0,
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OPENPIC_CONFIG_RESET);
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while (openpic_readfield(&OpenPIC->Global.Global_Configuration0,
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OPENPIC_CONFIG_RESET))
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mb();
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}
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#endif
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void __init openpic_set_sources(int first_irq, int num_irqs, void __iomem *first_ISR)
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{
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volatile OpenPIC_Source __iomem *src = first_ISR;
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int i, last_irq;
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last_irq = first_irq + num_irqs;
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if (last_irq > NumSources)
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NumSources = last_irq;
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if (src == 0)
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src = &((struct OpenPIC __iomem *)OpenPIC_Addr)->Source[first_irq];
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for (i = first_irq; i < last_irq; ++i, ++src)
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ISR[i] = src;
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}
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/*
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* The `offset' parameter defines where the interrupts handled by the
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* OpenPIC start in the space of interrupt numbers that the kernel knows
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* about. In other words, the OpenPIC's IRQ0 is numbered `offset' in the
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* kernel's interrupt numbering scheme.
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* We assume there is only one OpenPIC.
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*/
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void __init openpic_init(int offset)
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{
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u_int t, i;
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u_int timerfreq;
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const char *version;
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if (!OpenPIC_Addr) {
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printk("No OpenPIC found !\n");
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return;
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}
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OpenPIC = (volatile struct OpenPIC __iomem *)OpenPIC_Addr;
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#ifdef CONFIG_EPIC_SERIAL_MODE
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/* Have to start from ground zero.
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*/
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openpic_reset();
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#endif
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if (ppc_md.progress) ppc_md.progress("openpic: enter", 0x122);
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t = openpic_read(&OpenPIC->Global.Feature_Reporting0);
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switch (t & OPENPIC_FEATURE_VERSION_MASK) {
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case 1:
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version = "1.0";
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break;
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case 2:
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version = "1.2";
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break;
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case 3:
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version = "1.3";
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break;
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default:
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version = "?";
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break;
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}
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NumProcessors = ((t & OPENPIC_FEATURE_LAST_PROCESSOR_MASK) >>
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OPENPIC_FEATURE_LAST_PROCESSOR_SHIFT) + 1;
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if (NumSources == 0)
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openpic_set_sources(0,
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((t & OPENPIC_FEATURE_LAST_SOURCE_MASK) >>
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OPENPIC_FEATURE_LAST_SOURCE_SHIFT) + 1,
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NULL);
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printk("OpenPIC Version %s (%d CPUs and %d IRQ sources) at %p\n",
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version, NumProcessors, NumSources, OpenPIC);
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timerfreq = openpic_read(&OpenPIC->Global.Timer_Frequency);
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if (timerfreq)
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printk("OpenPIC timer frequency is %d.%06d MHz\n",
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timerfreq / 1000000, timerfreq % 1000000);
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open_pic_irq_offset = offset;
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/* Initialize timer interrupts */
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if ( ppc_md.progress ) ppc_md.progress("openpic: timer",0x3ba);
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for (i = 0; i < OPENPIC_NUM_TIMERS; i++) {
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/* Disabled, Priority 0 */
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openpic_inittimer(i, 0, OPENPIC_VEC_TIMER+i+offset);
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/* No processor */
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openpic_maptimer(i, CPU_MASK_NONE);
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}
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#ifdef CONFIG_SMP
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/* Initialize IPI interrupts */
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if ( ppc_md.progress ) ppc_md.progress("openpic: ipi",0x3bb);
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for (i = 0; i < OPENPIC_NUM_IPI; i++) {
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/* Disabled, increased priorities 10..13 */
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openpic_initipi(i, OPENPIC_PRIORITY_IPI_BASE+i,
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OPENPIC_VEC_IPI+i+offset);
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/* IPIs are per-CPU */
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irq_desc[OPENPIC_VEC_IPI+i+offset].status |= IRQ_PER_CPU;
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irq_desc[OPENPIC_VEC_IPI+i+offset].chip = &open_pic_ipi;
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}
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#endif
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/* Initialize external interrupts */
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if (ppc_md.progress) ppc_md.progress("openpic: external",0x3bc);
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openpic_set_priority(0xf);
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/* Init all external sources, including possibly the cascade. */
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for (i = 0; i < NumSources; i++) {
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int sense;
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if (ISR[i] == 0)
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continue;
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/* the bootloader may have left it enabled (bad !) */
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openpic_disable_irq(i+offset);
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sense = (i < OpenPIC_NumInitSenses)? OpenPIC_InitSenses[i]: \
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(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE);
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if (sense & IRQ_SENSE_MASK)
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irq_desc[i+offset].status = IRQ_LEVEL;
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/* Enabled, Default priority */
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openpic_initirq(i, OPENPIC_PRIORITY_DEFAULT, i+offset,
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(sense & IRQ_POLARITY_MASK),
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(sense & IRQ_SENSE_MASK));
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/* Processor 0 */
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openpic_mapirq(i, CPU_MASK_CPU0, CPU_MASK_NONE);
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}
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/* Init descriptors */
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for (i = offset; i < NumSources + offset; i++)
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irq_desc[i].chip = &open_pic;
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/* Initialize the spurious interrupt */
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if (ppc_md.progress) ppc_md.progress("openpic: spurious",0x3bd);
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openpic_set_spurious(OPENPIC_VEC_SPURIOUS);
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openpic_disable_8259_pass_through();
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#ifdef CONFIG_EPIC_SERIAL_MODE
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if (epic_serial_mode) {
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openpic_eicr_set_clk(7); /* Slowest value until we know better */
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openpic_enable_sie();
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}
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#endif
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openpic_set_priority(0);
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if (ppc_md.progress) ppc_md.progress("openpic: exit",0x222);
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}
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#ifdef notused
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static void openpic_enable_8259_pass_through(void)
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{
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openpic_clearfield(&OpenPIC->Global.Global_Configuration0,
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OPENPIC_CONFIG_8259_PASSTHROUGH_DISABLE);
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}
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#endif /* notused */
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static void openpic_disable_8259_pass_through(void)
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{
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openpic_setfield(&OpenPIC->Global.Global_Configuration0,
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OPENPIC_CONFIG_8259_PASSTHROUGH_DISABLE);
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}
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/*
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* Find out the current interrupt
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*/
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u_int openpic_irq(void)
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{
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u_int vec;
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DECL_THIS_CPU;
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CHECK_THIS_CPU;
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vec = openpic_readfield(&OpenPIC->THIS_CPU.Interrupt_Acknowledge,
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OPENPIC_VECTOR_MASK);
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return vec;
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}
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void openpic_eoi(void)
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{
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DECL_THIS_CPU;
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CHECK_THIS_CPU;
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openpic_write(&OpenPIC->THIS_CPU.EOI, 0);
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/* Handle PCI write posting */
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(void)openpic_read(&OpenPIC->THIS_CPU.EOI);
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}
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u_int openpic_get_priority(void)
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{
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DECL_THIS_CPU;
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CHECK_THIS_CPU;
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return openpic_readfield(&OpenPIC->THIS_CPU.Current_Task_Priority,
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OPENPIC_CURRENT_TASK_PRIORITY_MASK);
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}
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void openpic_set_priority(u_int pri)
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{
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DECL_THIS_CPU;
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CHECK_THIS_CPU;
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check_arg_pri(pri);
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openpic_writefield(&OpenPIC->THIS_CPU.Current_Task_Priority,
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OPENPIC_CURRENT_TASK_PRIORITY_MASK, pri);
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}
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/*
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* Get/set the spurious vector
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*/
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#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);
|
|
|