| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 1992 Linus Torvalds |
| 7 | * Copyright (C) 1994 - 2001, 2003 Ralf Baechle |
| 8 | */ |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/interrupt.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/spinlock.h> |
| 13 | |
| 14 | #include <asm/i8259.h> |
| 15 | #include <asm/io.h> |
| 16 | #include <asm/jazz.h> |
| 17 | |
| 18 | extern asmlinkage void jazz_handle_int(void); |
| 19 | |
| 20 | static DEFINE_SPINLOCK(r4030_lock); |
| 21 | |
| 22 | static void enable_r4030_irq(unsigned int irq) |
| 23 | { |
| 24 | unsigned int mask = 1 << (irq - JAZZ_PARALLEL_IRQ); |
| 25 | unsigned long flags; |
| 26 | |
| 27 | spin_lock_irqsave(&r4030_lock, flags); |
| 28 | mask |= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE); |
| 29 | r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask); |
| 30 | spin_unlock_irqrestore(&r4030_lock, flags); |
| 31 | } |
| 32 | |
| 33 | static unsigned int startup_r4030_irq(unsigned int irq) |
| 34 | { |
| 35 | enable_r4030_irq(irq); |
| 36 | return 0; /* never anything pending */ |
| 37 | } |
| 38 | |
| 39 | #define shutdown_r4030_irq disable_r4030_irq |
| 40 | |
| 41 | void disable_r4030_irq(unsigned int irq) |
| 42 | { |
| 43 | unsigned int mask = ~(1 << (irq - JAZZ_PARALLEL_IRQ)); |
| 44 | unsigned long flags; |
| 45 | |
| 46 | spin_lock_irqsave(&r4030_lock, flags); |
| 47 | mask &= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE); |
| 48 | r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask); |
| 49 | spin_unlock_irqrestore(&r4030_lock, flags); |
| 50 | } |
| 51 | |
| 52 | #define mask_and_ack_r4030_irq disable_r4030_irq |
| 53 | |
| 54 | static void end_r4030_irq(unsigned int irq) |
| 55 | { |
| 56 | if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) |
| 57 | enable_r4030_irq(irq); |
| 58 | } |
| 59 | |
| 60 | static struct hw_interrupt_type r4030_irq_type = { |
| 61 | "R4030", |
| 62 | startup_r4030_irq, |
| 63 | shutdown_r4030_irq, |
| 64 | enable_r4030_irq, |
| 65 | disable_r4030_irq, |
| 66 | mask_and_ack_r4030_irq, |
| 67 | end_r4030_irq, |
| 68 | NULL |
| 69 | }; |
| 70 | |
| 71 | void __init init_r4030_ints(void) |
| 72 | { |
| 73 | int i; |
| 74 | |
| 75 | for (i = JAZZ_PARALLEL_IRQ; i <= JAZZ_TIMER_IRQ; i++) { |
| 76 | irq_desc[i].status = IRQ_DISABLED; |
| 77 | irq_desc[i].action = 0; |
| 78 | irq_desc[i].depth = 1; |
| 79 | irq_desc[i].handler = &r4030_irq_type; |
| 80 | } |
| 81 | |
| 82 | r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 0); |
| 83 | r4030_read_reg16(JAZZ_IO_IRQ_SOURCE); /* clear pending IRQs */ |
| 84 | r4030_read_reg32(JAZZ_R4030_INVAL_ADDR); /* clear error bits */ |
| 85 | } |
| 86 | |
| 87 | /* |
| 88 | * On systems with i8259-style interrupt controllers we assume for |
| 89 | * driver compatibility reasons interrupts 0 - 15 to be the i8259 |
| 90 | * interrupts even if the hardware uses a different interrupt numbering. |
| 91 | */ |
| 92 | void __init arch_init_irq(void) |
| 93 | { |
| 94 | set_except_vector(0, jazz_handle_int); |
| 95 | |
| 96 | init_i8259_irqs(); /* Integrated i8259 */ |
| 97 | init_r4030_ints(); |
| 98 | |
| 99 | change_c0_status(ST0_IM, IE_IRQ4 | IE_IRQ3 | IE_IRQ2 | IE_IRQ1); |
| 100 | } |