Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/sh/boards/systemh/irq.c |
| 3 | * |
| 4 | * Copyright (C) 2000 Kazumoto Kojima |
| 5 | * |
| 6 | * Hitachi SystemH Support. |
| 7 | * |
| 8 | * Modified for 7751 SystemH by |
| 9 | * Jonathan Short. |
| 10 | */ |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/init.h> |
| 13 | #include <linux/irq.h> |
| 14 | |
| 15 | #include <linux/hdreg.h> |
| 16 | #include <linux/ide.h> |
| 17 | #include <asm/io.h> |
| 18 | #include <asm/mach/7751systemh.h> |
| 19 | #include <asm/smc37c93x.h> |
| 20 | |
| 21 | /* address of external interrupt mask register |
| 22 | * address must be set prior to use these (maybe in init_XXX_irq()) |
| 23 | * XXX : is it better to use .config than specifying it in code? */ |
| 24 | static unsigned long *systemh_irq_mask_register = (unsigned long *)0xB3F10004; |
| 25 | static unsigned long *systemh_irq_request_register = (unsigned long *)0xB3F10000; |
| 26 | |
| 27 | /* forward declaration */ |
| 28 | static unsigned int startup_systemh_irq(unsigned int irq); |
| 29 | static void shutdown_systemh_irq(unsigned int irq); |
| 30 | static void enable_systemh_irq(unsigned int irq); |
| 31 | static void disable_systemh_irq(unsigned int irq); |
| 32 | static void mask_and_ack_systemh(unsigned int); |
| 33 | static void end_systemh_irq(unsigned int irq); |
| 34 | |
| 35 | /* hw_interrupt_type */ |
| 36 | static struct hw_interrupt_type systemh_irq_type = { |
Thomas Gleixner | 08d0fd0 | 2005-09-10 00:26:42 -0700 | [diff] [blame] | 37 | .typename = " SystemH Register", |
| 38 | .startup = startup_systemh_irq, |
| 39 | .shutdown = shutdown_systemh_irq, |
| 40 | .enable = enable_systemh_irq, |
| 41 | .disable = disable_systemh_irq, |
| 42 | .ack = mask_and_ack_systemh, |
| 43 | .end = end_systemh_irq |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | }; |
| 45 | |
| 46 | static unsigned int startup_systemh_irq(unsigned int irq) |
| 47 | { |
| 48 | enable_systemh_irq(irq); |
| 49 | return 0; /* never anything pending */ |
| 50 | } |
| 51 | |
| 52 | static void shutdown_systemh_irq(unsigned int irq) |
| 53 | { |
| 54 | disable_systemh_irq(irq); |
| 55 | } |
| 56 | |
| 57 | static void disable_systemh_irq(unsigned int irq) |
| 58 | { |
| 59 | if (systemh_irq_mask_register) { |
| 60 | unsigned long flags; |
| 61 | unsigned long val, mask = 0x01 << 1; |
| 62 | |
| 63 | /* Clear the "irq"th bit in the mask and set it in the request */ |
| 64 | local_irq_save(flags); |
| 65 | |
| 66 | val = ctrl_inl((unsigned long)systemh_irq_mask_register); |
| 67 | val &= ~mask; |
| 68 | ctrl_outl(val, (unsigned long)systemh_irq_mask_register); |
| 69 | |
| 70 | val = ctrl_inl((unsigned long)systemh_irq_request_register); |
| 71 | val |= mask; |
| 72 | ctrl_outl(val, (unsigned long)systemh_irq_request_register); |
| 73 | |
| 74 | local_irq_restore(flags); |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | static void enable_systemh_irq(unsigned int irq) |
| 79 | { |
| 80 | if (systemh_irq_mask_register) { |
| 81 | unsigned long flags; |
| 82 | unsigned long val, mask = 0x01 << 1; |
| 83 | |
| 84 | /* Set "irq"th bit in the mask register */ |
| 85 | local_irq_save(flags); |
| 86 | val = ctrl_inl((unsigned long)systemh_irq_mask_register); |
| 87 | val |= mask; |
| 88 | ctrl_outl(val, (unsigned long)systemh_irq_mask_register); |
| 89 | local_irq_restore(flags); |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | static void mask_and_ack_systemh(unsigned int irq) |
| 94 | { |
| 95 | disable_systemh_irq(irq); |
| 96 | } |
| 97 | |
| 98 | static void end_systemh_irq(unsigned int irq) |
| 99 | { |
| 100 | if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) |
| 101 | enable_systemh_irq(irq); |
| 102 | } |
| 103 | |
| 104 | void make_systemh_irq(unsigned int irq) |
| 105 | { |
| 106 | disable_irq_nosync(irq); |
Ingo Molnar | d1bef4e | 2006-06-29 02:24:36 -0700 | [diff] [blame] | 107 | irq_desc[irq].chip = &systemh_irq_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | disable_systemh_irq(irq); |
| 109 | } |
| 110 | |