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Linux/arch/m68k/kernel/ints.c

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  1 /*
  2  * linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code
  3  *
  4  * This file is subject to the terms and conditions of the GNU General Public
  5  * License.  See the file COPYING in the main directory of this archive
  6  * for more details.
  7  */
  8 
  9 #include <linux/module.h>
 10 #include <linux/types.h>
 11 #include <linux/sched.h>
 12 #include <linux/interrupt.h>
 13 #include <linux/kernel_stat.h>
 14 #include <linux/errno.h>
 15 #include <linux/init.h>
 16 
 17 #include <asm/setup.h>
 18 #include <asm/irq.h>
 19 #include <asm/traps.h>
 20 #include <asm/page.h>
 21 #include <asm/machdep.h>
 22 #include <asm/cacheflush.h>
 23 #include <asm/irq_regs.h>
 24 
 25 #ifdef CONFIG_Q40
 26 #include <asm/q40ints.h>
 27 #endif
 28 
 29 extern u32 auto_irqhandler_fixup[];
 30 extern u16 user_irqvec_fixup[];
 31 
 32 static int m68k_first_user_vec;
 33 
 34 static struct irq_chip auto_irq_chip = {
 35         .name           = "auto",
 36         .irq_startup    = m68k_irq_startup,
 37         .irq_shutdown   = m68k_irq_shutdown,
 38 };
 39 
 40 static struct irq_chip user_irq_chip = {
 41         .name           = "user",
 42         .irq_startup    = m68k_irq_startup,
 43         .irq_shutdown   = m68k_irq_shutdown,
 44 };
 45 
 46 /*
 47  * void init_IRQ(void)
 48  *
 49  * Parameters:  None
 50  *
 51  * Returns:     Nothing
 52  *
 53  * This function should be called during kernel startup to initialize
 54  * the IRQ handling routines.
 55  */
 56 
 57 void __init init_IRQ(void)
 58 {
 59         int i;
 60 
 61         /* assembly irq entry code relies on this... */
 62         if (HARDIRQ_MASK != 0x00ff0000) {
 63                 extern void hardirq_mask_is_broken(void);
 64                 hardirq_mask_is_broken();
 65         }
 66 
 67         for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
 68                 irq_set_chip_and_handler(i, &auto_irq_chip, handle_simple_irq);
 69 
 70         mach_init_IRQ();
 71 }
 72 
 73 /**
 74  * m68k_setup_auto_interrupt
 75  * @handler: called from auto vector interrupts
 76  *
 77  * setup the handler to be called from auto vector interrupts instead of the
 78  * standard do_IRQ(), it will be called with irq numbers in the range
 79  * from IRQ_AUTO_1 - IRQ_AUTO_7.
 80  */
 81 void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *))
 82 {
 83         if (handler)
 84                 *auto_irqhandler_fixup = (u32)handler;
 85         flush_icache();
 86 }
 87 
 88 /**
 89  * m68k_setup_user_interrupt
 90  * @vec: first user vector interrupt to handle
 91  * @cnt: number of active user vector interrupts
 92  *
 93  * setup user vector interrupts, this includes activating the specified range
 94  * of interrupts, only then these interrupts can be requested (note: this is
 95  * different from auto vector interrupts).
 96  */
 97 void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt)
 98 {
 99         int i;
100 
101         BUG_ON(IRQ_USER + cnt > NR_IRQS);
102         m68k_first_user_vec = vec;
103         for (i = 0; i < cnt; i++)
104                 irq_set_chip_and_handler(i, &user_irq_chip, handle_simple_irq);
105         *user_irqvec_fixup = vec - IRQ_USER;
106         flush_icache();
107 }
108 
109 /**
110  * m68k_setup_irq_controller
111  * @chip: irq chip which controls specified irq
112  * @handle: flow handler which handles specified irq
113  * @irq: first irq to be managed by the controller
114  * @cnt: number of irqs to be managed by the controller
115  *
116  * Change the controller for the specified range of irq, which will be used to
117  * manage these irq. auto/user irq already have a default controller, which can
118  * be changed as well, but the controller probably should use m68k_irq_startup/
119  * m68k_irq_shutdown.
120  */
121 void m68k_setup_irq_controller(struct irq_chip *chip,
122                                irq_flow_handler_t handle, unsigned int irq,
123                                unsigned int cnt)
124 {
125         int i;
126 
127         for (i = 0; i < cnt; i++) {
128                 irq_set_chip(irq + i, chip);
129                 if (handle)
130                         irq_set_handler(irq + i, handle);
131         }
132 }
133 
134 unsigned int m68k_irq_startup_irq(unsigned int irq)
135 {
136         if (irq <= IRQ_AUTO_7)
137                 vectors[VEC_SPUR + irq] = auto_inthandler;
138         else
139                 vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler;
140         return 0;
141 }
142 
143 unsigned int m68k_irq_startup(struct irq_data *data)
144 {
145         return m68k_irq_startup_irq(data->irq);
146 }
147 
148 void m68k_irq_shutdown(struct irq_data *data)
149 {
150         unsigned int irq = data->irq;
151 
152         if (irq <= IRQ_AUTO_7)
153                 vectors[VEC_SPUR + irq] = bad_inthandler;
154         else
155                 vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler;
156 }
157 
158 
159 unsigned int irq_canonicalize(unsigned int irq)
160 {
161 #ifdef CONFIG_Q40
162         if (MACH_IS_Q40 && irq == 11)
163                 irq = 10;
164 #endif
165         return irq;
166 }
167 
168 EXPORT_SYMBOL(irq_canonicalize);
169 
170 
171 asmlinkage void handle_badint(struct pt_regs *regs)
172 {
173         atomic_inc(&irq_err_count);
174         pr_warn("unexpected interrupt from %u\n", regs->vector);
175 }
176 

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