arch/sh/boards/cqreek/irq.c

   1 /* $Id: irq.c,v 1.1.2.4 2002/11/04 20:33:56 lethal Exp $
   2  *
   3  * arch/sh/boards/cqreek/irq.c
   4  *
   5  * Copyright (C) 2000  Niibe Yutaka
   6  *
   7  * CqREEK IDE/ISA Bridge Support.
   8  *
   9  */
  10
  11 #include <linux/irq.h>
  12 #include <linux/init.h>
  13
  14 #include <asm/cqreek/cqreek.h>
  15 #include <asm/io.h>
  16 #include <asm/io_generic.h>
  17 #include <asm/irq.h>
  18 #include <asm/machvec.h>
  19 #include <asm/machvec_init.h>
  20 #include <asm/rtc.h>
  21
  22 struct cqreek_irq_data {
  23         unsigned short mask_port;       /* Port of Interrupt Mask Register */
  24         unsigned short stat_port;       /* Port of Interrupt Status Register */
  25         unsigned short bit;             /* Value of the bit */
  26 };
  27 static struct cqreek_irq_data cqreek_irq_data[NR_IRQS];
  28
  29 static void disable_cqreek_irq(unsigned int irq)
  30 {
  31         unsigned long flags;
  32         unsigned short mask;
  33         unsigned short mask_port = cqreek_irq_data[irq].mask_port;
  34         unsigned short bit = cqreek_irq_data[irq].bit;
  35
  36         local_irq_save(flags);
  37         /* Disable IRQ */
  38         mask = inw(mask_port) & ~bit;
  39         outw_p(mask, mask_port);
  40         local_irq_restore(flags);
  41 }
  42
  43 static void enable_cqreek_irq(unsigned int irq)
  44 {
  45         unsigned long flags;
  46         unsigned short mask;
  47         unsigned short mask_port = cqreek_irq_data[irq].mask_port;
  48         unsigned short bit = cqreek_irq_data[irq].bit;
  49
  50         local_irq_save(flags);
  51         /* Enable IRQ */
  52         mask = inw(mask_port) | bit;
  53         outw_p(mask, mask_port);
  54         local_irq_restore(flags);
  55 }
  56
  57 static void mask_and_ack_cqreek(unsigned int irq)
  58 {
  59         unsigned short stat_port = cqreek_irq_data[irq].stat_port;
  60         unsigned short bit = cqreek_irq_data[irq].bit;
  61
  62         disable_cqreek_irq(irq);
  63         /* Clear IRQ (it might be edge IRQ) */
  64         inw(stat_port);
  65         outw_p(bit, stat_port);
  66 }
  67
  68 static void end_cqreek_irq(unsigned int irq)
  69 {
  70         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  71                 enable_cqreek_irq(irq);
  72 }
  73
  74 static unsigned int startup_cqreek_irq(unsigned int irq)
  75 {
  76         enable_cqreek_irq(irq);
  77         return 0;
  78 }
  79
  80 static void shutdown_cqreek_irq(unsigned int irq)
  81 {
  82         disable_cqreek_irq(irq);
  83 }
  84
  85 static struct hw_interrupt_type cqreek_irq_type = {
  86         "CqREEK-IRQ",
  87         startup_cqreek_irq,
  88         shutdown_cqreek_irq,
  89         enable_cqreek_irq,
  90         disable_cqreek_irq,
  91         mask_and_ack_cqreek,
  92         end_cqreek_irq
  93 };
  94
  95 int cqreek_has_ide, cqreek_has_isa;
  96
  97 /* XXX: This is just for test for my NE2000 ISA board
  98    What we really need is virtualized IRQ and demultiplexer like HP600 port */
  99 void __init init_cqreek_IRQ(void)
 100 {
 101         if (cqreek_has_ide) {
 102                 cqreek_irq_data[14].mask_port = BRIDGE_IDE_INTR_MASK;
 103                 cqreek_irq_data[14].stat_port = BRIDGE_IDE_INTR_STAT;
 104                 cqreek_irq_data[14].bit = 1;
 105
 106                 irq_desc[14].handler = &cqreek_irq_type;
 107                 irq_desc[14].status = IRQ_DISABLED;
 108                 irq_desc[14].action = 0;
 109                 irq_desc[14].depth = 1;
 110
 111                 disable_cqreek_irq(14);
 112         }
 113
 114         if (cqreek_has_isa) {
 115                 cqreek_irq_data[10].mask_port = BRIDGE_ISA_INTR_MASK;
 116                 cqreek_irq_data[10].stat_port = BRIDGE_ISA_INTR_STAT;
 117                 cqreek_irq_data[10].bit = (1 << 10);
 118
 119                 /* XXX: Err... we may need demultiplexer for ISA irq... */
 120                 irq_desc[10].handler = &cqreek_irq_type;
 121                 irq_desc[10].status = IRQ_DISABLED;
 122                 irq_desc[10].action = 0;
 123                 irq_desc[10].depth = 1;
 124
 125                 disable_cqreek_irq(10);
 126         }
 127 }
 128