projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | ||
| 12 | #include <linux/config.h> | |
| 13 | #include <linux/init.h> | |
| 14 | #include <linux/irq.h> | |
| 15 | ||
| 16 | #include <linux/hdreg.h> | |
| 17 | #include <linux/ide.h> | |
| 18 | #include <asm/io.h> | |
| 19 | #include <asm/mach/7751systemh.h> | |
| 20 | #include <asm/smc37c93x.h> | |
| 21 | ||
| 22 | /* address of external interrupt mask register | |
| 23 | * address must be set prior to use these (maybe in init_XXX_irq()) | |
| 24 | * XXX : is it better to use .config than specifying it in code? */ | |
| 25 | static unsigned long *systemh_irq_mask_register = (unsigned long *)0xB3F10004; | |
| 26 | static unsigned long *systemh_irq_request_register = (unsigned long *)0xB3F10000; | |
| 27 | ||
| 28 | /* forward declaration */ | |
| 29 | static unsigned int startup_systemh_irq(unsigned int irq); | |
| 30 | static void shutdown_systemh_irq(unsigned int irq); | |
| 31 | static void enable_systemh_irq(unsigned int irq); | |
| 32 | static void disable_systemh_irq(unsigned int irq); | |
| 33 | static void mask_and_ack_systemh(unsigned int); | |
| 34 | static void end_systemh_irq(unsigned int irq); | |
| 35 | ||
| 36 | /* hw_interrupt_type */ | |
| 37 | static struct hw_interrupt_type systemh_irq_type = { | |
| 38 | " SystemH Register", | |
| 39 | startup_systemh_irq, | |
| 40 | shutdown_systemh_irq, | |
| 41 | enable_systemh_irq, | |
| 42 | disable_systemh_irq, | |
| 43 | mask_and_ack_systemh, | |
| 44 | end_systemh_irq | |
| 45 | }; | |
| 46 | ||
| 47 | static unsigned int startup_systemh_irq(unsigned int irq) | |
| 48 | { | |
| 49 | enable_systemh_irq(irq); | |
| 50 | return 0; /* never anything pending */ | |
| 51 | } | |
| 52 | ||
| 53 | static void shutdown_systemh_irq(unsigned int irq) | |
| 54 | { | |
| 55 | disable_systemh_irq(irq); | |
| 56 | } | |
| 57 | ||
| 58 | static void disable_systemh_irq(unsigned int irq) | |
| 59 | { | |
| 60 | if (systemh_irq_mask_register) { | |
| 61 | unsigned long flags; | |
| 62 | unsigned long val, mask = 0x01 << 1; | |
| 63 | ||
| 64 | /* Clear the "irq"th bit in the mask and set it in the request */ | |
| 65 | local_irq_save(flags); | |
| 66 | ||
| 67 | val = ctrl_inl((unsigned long)systemh_irq_mask_register); | |
| 68 | val &= ~mask; | |
| 69 | ctrl_outl(val, (unsigned long)systemh_irq_mask_register); | |
| 70 | ||
| 71 | val = ctrl_inl((unsigned long)systemh_irq_request_register); | |
| 72 | val |= mask; | |
| 73 | ctrl_outl(val, (unsigned long)systemh_irq_request_register); | |
| 74 | ||
| 75 | local_irq_restore(flags); | |
| 76 | } | |
| 77 | } | |
| 78 | ||
| 79 | static void enable_systemh_irq(unsigned int irq) | |
| 80 | { | |
| 81 | if (systemh_irq_mask_register) { | |
| 82 | unsigned long flags; | |
| 83 | unsigned long val, mask = 0x01 << 1; | |
| 84 | ||
| 85 | /* Set "irq"th bit in the mask register */ | |
| 86 | local_irq_save(flags); | |
| 87 | val = ctrl_inl((unsigned long)systemh_irq_mask_register); | |
| 88 | val |= mask; | |
| 89 | ctrl_outl(val, (unsigned long)systemh_irq_mask_register); | |
| 90 | local_irq_restore(flags); | |
| 91 | } | |
| 92 | } | |
| 93 | ||
| 94 | static void mask_and_ack_systemh(unsigned int irq) | |
| 95 | { | |
| 96 | disable_systemh_irq(irq); | |
| 97 | } | |
| 98 | ||
| 99 | static void end_systemh_irq(unsigned int irq) | |
| 100 | { | |
| 101 | if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) | |
| 102 | enable_systemh_irq(irq); | |
| 103 | } | |
| 104 | ||
| 105 | void make_systemh_irq(unsigned int irq) | |
| 106 | { | |
| 107 | disable_irq_nosync(irq); | |
| 108 | irq_desc[irq].handler = &systemh_irq_type; | |
| 109 | disable_systemh_irq(irq); | |
| 110 | } | |
| 111 |