| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/sh/boards/saturn/irq.c |
| 3 | * |
| 4 | * Copyright (C) 2002 Paul Mundt |
| 5 | * |
| 6 | * Released under the terms of the GNU GPL v2.0. |
| 7 | */ |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/interrupt.h> |
| 11 | #include <asm/irq.h> |
| 12 | #include <asm/io.h> |
| 13 | |
| 14 | /* |
| 15 | * Interrupts map out as follows: |
| 16 | * |
| 17 | * Vector Name Mask |
| 18 | * |
| 19 | * 64 VBLANKIN 0x0001 |
| 20 | * 65 VBLANKOUT 0x0002 |
| 21 | * 66 HBLANKIN 0x0004 |
| 22 | * 67 TIMER0 0x0008 |
| 23 | * 68 TIMER1 0x0010 |
| 24 | * 69 DSPEND 0x0020 |
| 25 | * 70 SOUNDREQUEST 0x0040 |
| 26 | * 71 SYSTEMMANAGER 0x0080 |
| 27 | * 72 PAD 0x0100 |
| 28 | * 73 LEVEL2DMAEND 0x0200 |
| 29 | * 74 LEVEL1DMAEND 0x0400 |
| 30 | * 75 LEVEL0DMAEND 0x0800 |
| 31 | * 76 DMAILLEGAL 0x1000 |
| 32 | * 77 SRITEDRAWEND 0x2000 |
| 33 | * 78 ABUS 0x8000 |
| 34 | * |
| 35 | */ |
| 36 | #define SATURN_IRQ_MIN 64 /* VBLANKIN */ |
| 37 | #define SATURN_IRQ_MAX 78 /* ABUS */ |
| 38 | |
| 39 | #define SATURN_IRQ_MASK 0xbfff |
| 40 | |
| 41 | static inline u32 saturn_irq_mask(unsigned int irq_nr) |
| 42 | { |
| 43 | u32 mask; |
| 44 | |
| 45 | mask = (1 << (irq_nr - SATURN_IRQ_MIN)); |
| 46 | mask <<= (irq_nr == SATURN_IRQ_MAX); |
| 47 | mask &= SATURN_IRQ_MASK; |
| 48 | |
| 49 | return mask; |
| 50 | } |
| 51 | |
| 52 | static inline void mask_saturn_irq(unsigned int irq_nr) |
| 53 | { |
| 54 | u32 mask; |
| 55 | |
| 56 | mask = ctrl_inl(SATURN_IMR); |
| 57 | mask |= saturn_irq_mask(irq_nr); |
| 58 | ctrl_outl(mask, SATURN_IMR); |
| 59 | } |
| 60 | |
| 61 | static inline void unmask_saturn_irq(unsigned int irq_nr) |
| 62 | { |
| 63 | u32 mask; |
| 64 | |
| 65 | mask = ctrl_inl(SATURN_IMR); |
| 66 | mask &= ~saturn_irq_mask(irq_nr); |
| 67 | ctrl_outl(mask, SATURN_IMR); |
| 68 | } |
| 69 | |
| 70 | static void disable_saturn_irq(unsigned int irq_nr) |
| 71 | { |
| 72 | mask_saturn_irq(irq_nr); |
| 73 | } |
| 74 | |
| 75 | static void enable_saturn_irq(unsigned int irq_nr) |
| 76 | { |
| 77 | unmask_saturn_irq(irq_nr); |
| 78 | } |
| 79 | |
| 80 | static void mask_and_ack_saturn_irq(unsigned int irq_nr) |
| 81 | { |
| 82 | mask_saturn_irq(irq_nr); |
| 83 | } |
| 84 | |
| 85 | static void end_saturn_irq(unsigned int irq_nr) |
| 86 | { |
| 87 | if (!(irq_desc[irq_nr].status & (IRQ_DISABLED | IRQ_INPROGRESS))) |
| 88 | unmask_saturn_irq(irq_nr); |
| 89 | } |
| 90 | |
| 91 | static unsigned int startup_saturn_irq(unsigned int irq_nr) |
| 92 | { |
| 93 | unmask_saturn_irq(irq_nr); |
| 94 | |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | static void shutdown_saturn_irq(unsigned int irq_nr) |
| 99 | { |
| 100 | mask_saturn_irq(irq_nr); |
| 101 | } |
| 102 | |
| 103 | static struct hw_interrupt_type saturn_int = { |
| 104 | .typename = "Saturn", |
| 105 | .enable = enable_saturn_irq, |
| 106 | .disable = disable_saturn_irq, |
| 107 | .ack = mask_and_ack_saturn_irq, |
| 108 | .end = end_saturn_irq, |
| 109 | .startup = startup_saturn_irq, |
| 110 | .shutdown = shutdown_saturn_irq, |
| 111 | }; |
| 112 | |
| 113 | int saturn_irq_demux(int irq_nr) |
| 114 | { |
| 115 | /* FIXME */ |
| 116 | return irq_nr; |
| 117 | } |
| 118 | |