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169 lines
4.0 KiB
169 lines
4.0 KiB
/* |
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* linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code |
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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/module.h> |
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#include <linux/types.h> |
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#include <linux/sched.h> |
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#include <linux/interrupt.h> |
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#include <linux/errno.h> |
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#include <linux/init.h> |
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#include <linux/irq.h> |
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#include <asm/setup.h> |
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#include <asm/irq.h> |
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#include <asm/traps.h> |
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#include <asm/page.h> |
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#include <asm/machdep.h> |
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#include <asm/cacheflush.h> |
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#include <asm/irq_regs.h> |
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#ifdef CONFIG_Q40 |
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#include <asm/q40ints.h> |
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#endif |
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extern u32 auto_irqhandler_fixup[]; |
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extern u16 user_irqvec_fixup[]; |
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static int m68k_first_user_vec; |
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static struct irq_chip auto_irq_chip = { |
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.name = "auto", |
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.irq_startup = m68k_irq_startup, |
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.irq_shutdown = m68k_irq_shutdown, |
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}; |
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static struct irq_chip user_irq_chip = { |
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.name = "user", |
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.irq_startup = m68k_irq_startup, |
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.irq_shutdown = m68k_irq_shutdown, |
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}; |
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/* |
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* void init_IRQ(void) |
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* |
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* Parameters: None |
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* |
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* Returns: Nothing |
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* |
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* This function should be called during kernel startup to initialize |
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* the IRQ handling routines. |
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*/ |
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void __init init_IRQ(void) |
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{ |
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int i; |
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for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++) |
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irq_set_chip_and_handler(i, &auto_irq_chip, handle_simple_irq); |
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mach_init_IRQ(); |
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} |
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/** |
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* m68k_setup_auto_interrupt |
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* @handler: called from auto vector interrupts |
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* |
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* setup the handler to be called from auto vector interrupts instead of the |
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* standard do_IRQ(), it will be called with irq numbers in the range |
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* from IRQ_AUTO_1 - IRQ_AUTO_7. |
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*/ |
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void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *)) |
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{ |
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if (handler) |
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*auto_irqhandler_fixup = (u32)handler; |
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flush_icache(); |
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} |
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/** |
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* m68k_setup_user_interrupt |
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* @vec: first user vector interrupt to handle |
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* @cnt: number of active user vector interrupts |
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* |
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* setup user vector interrupts, this includes activating the specified range |
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* of interrupts, only then these interrupts can be requested (note: this is |
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* different from auto vector interrupts). |
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*/ |
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void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt) |
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{ |
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int i; |
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BUG_ON(IRQ_USER + cnt > NR_IRQS); |
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m68k_first_user_vec = vec; |
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for (i = 0; i < cnt; i++) |
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irq_set_chip_and_handler(i, &user_irq_chip, handle_simple_irq); |
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*user_irqvec_fixup = vec - IRQ_USER; |
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flush_icache(); |
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} |
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/** |
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* m68k_setup_irq_controller |
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* @chip: irq chip which controls specified irq |
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* @handle: flow handler which handles specified irq |
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* @irq: first irq to be managed by the controller |
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* @cnt: number of irqs to be managed by the controller |
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* |
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* Change the controller for the specified range of irq, which will be used to |
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* manage these irq. auto/user irq already have a default controller, which can |
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* be changed as well, but the controller probably should use m68k_irq_startup/ |
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* m68k_irq_shutdown. |
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*/ |
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void m68k_setup_irq_controller(struct irq_chip *chip, |
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irq_flow_handler_t handle, unsigned int irq, |
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unsigned int cnt) |
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{ |
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int i; |
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for (i = 0; i < cnt; i++) { |
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irq_set_chip(irq + i, chip); |
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if (handle) |
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irq_set_handler(irq + i, handle); |
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} |
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} |
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unsigned int m68k_irq_startup_irq(unsigned int irq) |
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{ |
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if (irq <= IRQ_AUTO_7) |
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vectors[VEC_SPUR + irq] = auto_inthandler; |
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else |
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vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler; |
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return 0; |
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} |
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unsigned int m68k_irq_startup(struct irq_data *data) |
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{ |
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return m68k_irq_startup_irq(data->irq); |
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} |
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void m68k_irq_shutdown(struct irq_data *data) |
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{ |
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unsigned int irq = data->irq; |
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if (irq <= IRQ_AUTO_7) |
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vectors[VEC_SPUR + irq] = bad_inthandler; |
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else |
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vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler; |
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} |
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unsigned int irq_canonicalize(unsigned int irq) |
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{ |
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#ifdef CONFIG_Q40 |
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if (MACH_IS_Q40 && irq == 11) |
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irq = 10; |
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#endif |
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return irq; |
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} |
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EXPORT_SYMBOL(irq_canonicalize); |
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asmlinkage void handle_badint(struct pt_regs *regs) |
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{ |
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atomic_inc(&irq_err_count); |
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pr_warn("unexpected interrupt from %u\n", regs->vector); |
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}
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