![Al Viro](/assets/img/avatar_default.png)
Now that the last inlined instances are gone, all that is left to do is turning disable_irq_nosync on arm26 and m68k from defines to aliases and we are all set - we can make these externs in linux/interrupt.h uncoditional and kill remaining instances in asm/irq.h Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
437 lines
10 KiB
C
437 lines
10 KiB
C
/*
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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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* 07/03/96: Timer initialization, and thus mach_sched_init(),
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* removed from request_irq() and moved to init_time().
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* We should therefore consider renaming our add_isr() and
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* remove_isr() to request_irq() and free_irq()
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* respectively, so they are compliant with the other
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* architectures. /Jes
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* 11/07/96: Changed all add_/remove_isr() to request_/free_irq() calls.
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* Removed irq list support, if any machine needs an irq server
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* it must implement this itself (as it's already done), instead
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* only default handler are used with mach_default_handler.
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* request_irq got some flags different from other architectures:
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* - IRQ_FLG_REPLACE : Replace an existing handler (the default one
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* can be replaced without this flag)
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* - IRQ_FLG_LOCK : handler can't be replaced
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* There are other machine depending flags, see there
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* If you want to replace a default handler you should know what
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* you're doing, since it might handle different other irq sources
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* which must be served /Roman Zippel
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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/kernel_stat.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <asm/setup.h>
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#include <asm/system.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 u32 user_irqhandler_fixup[];
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extern u16 user_irqvec_fixup[];
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/* table for system interrupt handlers */
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static struct irq_node *irq_list[NR_IRQS];
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static struct irq_controller *irq_controller[NR_IRQS];
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static int irq_depth[NR_IRQS];
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static int m68k_first_user_vec;
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static struct irq_controller auto_irq_controller = {
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.name = "auto",
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.lock = __SPIN_LOCK_UNLOCKED(auto_irq_controller.lock),
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.startup = m68k_irq_startup,
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.shutdown = m68k_irq_shutdown,
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};
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static struct irq_controller user_irq_controller = {
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.name = "user",
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.lock = __SPIN_LOCK_UNLOCKED(user_irq_controller.lock),
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.startup = m68k_irq_startup,
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.shutdown = m68k_irq_shutdown,
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};
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#define NUM_IRQ_NODES 100
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static irq_node_t nodes[NUM_IRQ_NODES];
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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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/* assembly irq entry code relies on this... */
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if (HARDIRQ_MASK != 0x00ff0000) {
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extern void hardirq_mask_is_broken(void);
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hardirq_mask_is_broken();
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}
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for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
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irq_controller[i] = &auto_irq_controller;
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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 __m68k_handle_int(), 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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* @handler: called from 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). An optional handler can be installed
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* to be called instead of the default __m68k_handle_int(), it will be called
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* with irq numbers starting from IRQ_USER.
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*/
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void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt,
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void (*handler)(unsigned int, struct pt_regs *))
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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_controller[IRQ_USER + i] = &user_irq_controller;
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*user_irqvec_fixup = vec - IRQ_USER;
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if (handler)
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*user_irqhandler_fixup = (u32)handler;
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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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* @contr: irq controller which controls specified irq
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* @irq: first irq 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_controller *contr, 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_controller[irq + i] = contr;
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}
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irq_node_t *new_irq_node(void)
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{
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irq_node_t *node;
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short i;
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for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--) {
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if (!node->handler) {
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memset(node, 0, sizeof(*node));
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return node;
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}
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}
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printk ("new_irq_node: out of nodes\n");
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return NULL;
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}
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int setup_irq(unsigned int irq, struct irq_node *node)
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{
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struct irq_controller *contr;
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struct irq_node **prev;
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unsigned long flags;
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if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
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printk("%s: Incorrect IRQ %d from %s\n",
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__FUNCTION__, irq, node->devname);
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return -ENXIO;
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}
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spin_lock_irqsave(&contr->lock, flags);
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prev = irq_list + irq;
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if (*prev) {
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/* Can't share interrupts unless both agree to */
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if (!((*prev)->flags & node->flags & IRQF_SHARED)) {
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spin_unlock_irqrestore(&contr->lock, flags);
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return -EBUSY;
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}
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while (*prev)
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prev = &(*prev)->next;
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}
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if (!irq_list[irq]) {
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if (contr->startup)
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contr->startup(irq);
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else
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contr->enable(irq);
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}
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node->next = NULL;
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*prev = node;
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spin_unlock_irqrestore(&contr->lock, flags);
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return 0;
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}
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int request_irq(unsigned int irq,
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irq_handler_t handler,
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unsigned long flags, const char *devname, void *dev_id)
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{
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struct irq_node *node;
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int res;
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node = new_irq_node();
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if (!node)
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return -ENOMEM;
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node->handler = handler;
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node->flags = flags;
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node->dev_id = dev_id;
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node->devname = devname;
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res = setup_irq(irq, node);
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if (res)
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node->handler = NULL;
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return res;
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}
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EXPORT_SYMBOL(request_irq);
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void free_irq(unsigned int irq, void *dev_id)
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{
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struct irq_controller *contr;
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struct irq_node **p, *node;
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unsigned long flags;
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if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
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printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
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return;
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}
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spin_lock_irqsave(&contr->lock, flags);
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p = irq_list + irq;
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while ((node = *p)) {
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if (node->dev_id == dev_id)
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break;
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p = &node->next;
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}
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if (node) {
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*p = node->next;
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node->handler = NULL;
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} else
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printk("%s: Removing probably wrong IRQ %d\n",
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__FUNCTION__, irq);
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if (!irq_list[irq]) {
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if (contr->shutdown)
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contr->shutdown(irq);
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else
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contr->disable(irq);
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}
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spin_unlock_irqrestore(&contr->lock, flags);
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}
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EXPORT_SYMBOL(free_irq);
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void enable_irq(unsigned int irq)
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{
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struct irq_controller *contr;
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unsigned long flags;
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if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
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printk("%s: Incorrect IRQ %d\n",
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__FUNCTION__, irq);
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return;
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}
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spin_lock_irqsave(&contr->lock, flags);
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if (irq_depth[irq]) {
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if (!--irq_depth[irq]) {
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if (contr->enable)
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contr->enable(irq);
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}
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} else
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WARN_ON(1);
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spin_unlock_irqrestore(&contr->lock, flags);
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}
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EXPORT_SYMBOL(enable_irq);
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void disable_irq(unsigned int irq)
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{
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struct irq_controller *contr;
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unsigned long flags;
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if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
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printk("%s: Incorrect IRQ %d\n",
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__FUNCTION__, irq);
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return;
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}
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spin_lock_irqsave(&contr->lock, flags);
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if (!irq_depth[irq]++) {
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if (contr->disable)
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contr->disable(irq);
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}
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spin_unlock_irqrestore(&contr->lock, flags);
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}
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EXPORT_SYMBOL(disable_irq);
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void disable_irq_nosync(unsigned int irq) __attribute__((alias("disable_irq")));
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EXPORT_SYMBOL(disable_irq_nosync);
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int m68k_irq_startup(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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void m68k_irq_shutdown(unsigned int irq)
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{
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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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/*
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* Do we need these probe functions on the m68k?
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*
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* ... may be useful with ISA devices
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*/
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unsigned long probe_irq_on (void)
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{
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#ifdef CONFIG_Q40
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if (MACH_IS_Q40)
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return q40_probe_irq_on();
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#endif
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return 0;
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}
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EXPORT_SYMBOL(probe_irq_on);
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int probe_irq_off (unsigned long irqs)
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{
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#ifdef CONFIG_Q40
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if (MACH_IS_Q40)
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return q40_probe_irq_off(irqs);
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#endif
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return 0;
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}
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EXPORT_SYMBOL(probe_irq_off);
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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 m68k_handle_int(unsigned int irq)
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{
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struct irq_node *node;
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kstat_cpu(0).irqs[irq]++;
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node = irq_list[irq];
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do {
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node->handler(irq, node->dev_id);
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node = node->next;
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} while (node);
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}
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asmlinkage void __m68k_handle_int(unsigned int irq, struct pt_regs *regs)
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{
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struct pt_regs *old_regs;
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old_regs = set_irq_regs(regs);
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m68k_handle_int(irq);
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set_irq_regs(old_regs);
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}
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asmlinkage void handle_badint(struct pt_regs *regs)
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{
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kstat_cpu(0).irqs[0]++;
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printk("unexpected interrupt from %u\n", regs->vector);
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}
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int show_interrupts(struct seq_file *p, void *v)
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{
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struct irq_controller *contr;
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struct irq_node *node;
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int i = *(loff_t *) v;
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/* autovector interrupts */
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if (irq_list[i]) {
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contr = irq_controller[i];
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node = irq_list[i];
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seq_printf(p, "%-8s %3u: %10u %s", contr->name, i, kstat_cpu(0).irqs[i], node->devname);
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while ((node = node->next))
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seq_printf(p, ", %s", node->devname);
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seq_puts(p, "\n");
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}
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return 0;
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}
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void init_irq_proc(void)
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{
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/* Insert /proc/irq driver here */
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}
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