arch/sh/boards/renesas/r7780rp/irq.c

   1 /*
   2  * linux/arch/sh/boards/renesas/r7780rp/irq.c
   3  *
   4  * Copyright (C) 2000  Kazumoto Kojima
   5  *
   6  * Renesas Solutions Highlander R7780RP-1 Support.
   7  *
   8  * Modified for R7780RP-1 by
   9  * Atom Create Engineering Co., Ltd. 2002.
  10  */
  11 #include <linux/init.h>
  12 #include <linux/irq.h>
  13 #include <asm/io.h>
  14 #include <asm/irq.h>
  15 #include <asm/r7780rp/r7780rp.h>
  16
  17 #ifdef CONFIG_SH_R7780MP
  18 static int mask_pos[] = {12, 11, 9, 14, 15, 8, 13, 6, 5, 4, 3, 2, 0, 0, 1, 0};
  19 #else
  20 static int mask_pos[] = {15, 14, 13, 12, 11, 10, 9, 8, 7, 5, 6, 4, 0, 1, 2, 0};
  21 #endif
  22
  23 static void enable_r7780rp_irq(unsigned int irq);
  24 static void disable_r7780rp_irq(unsigned int irq);
  25
  26 /* shutdown is same as "disable" */
  27 #define shutdown_r7780rp_irq disable_r7780rp_irq
  28
  29 static void ack_r7780rp_irq(unsigned int irq);
  30 static void end_r7780rp_irq(unsigned int irq);
  31
  32 static unsigned int startup_r7780rp_irq(unsigned int irq)
  33 {
  34         enable_r7780rp_irq(irq);
  35         return 0; /* never anything pending */
  36 }
  37
  38 static void disable_r7780rp_irq(unsigned int irq)
  39 {
  40         unsigned short val;
  41         unsigned short mask = 0xffff ^ (0x0001 << mask_pos[irq]);
  42
  43         /* Set the priority in IPR to 0 */
  44         val = ctrl_inw(IRLCNTR1);
  45         val &= mask;
  46         ctrl_outw(val, IRLCNTR1);
  47 }
  48
  49 static void enable_r7780rp_irq(unsigned int irq)
  50 {
  51         unsigned short val;
  52         unsigned short value = (0x0001 << mask_pos[irq]);
  53
  54         /* Set priority in IPR back to original value */
  55         val = ctrl_inw(IRLCNTR1);
  56         val |= value;
  57         ctrl_outw(val, IRLCNTR1);
  58 }
  59
  60 static void ack_r7780rp_irq(unsigned int irq)
  61 {
  62         disable_r7780rp_irq(irq);
  63 }
  64
  65 static void end_r7780rp_irq(unsigned int irq)
  66 {
  67         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  68                 enable_r7780rp_irq(irq);
  69 }
  70
  71 static struct hw_interrupt_type r7780rp_irq_type = {
  72         .typename = "R7780RP-IRQ",
  73         .startup = startup_r7780rp_irq,
  74         .shutdown = shutdown_r7780rp_irq,
  75         .enable = enable_r7780rp_irq,
  76         .disable = disable_r7780rp_irq,
  77         .ack = ack_r7780rp_irq,
  78         .end = end_r7780rp_irq,
  79 };
  80
  81 static void make_r7780rp_irq(unsigned int irq)
  82 {
  83         disable_irq_nosync(irq);
  84         irq_desc[irq].chip = &r7780rp_irq_type;
  85         disable_r7780rp_irq(irq);
  86 }
  87
  88 /*
  89  * Initialize IRQ setting
  90  */
  91 void __init init_r7780rp_IRQ(void)
  92 {
  93         int i;
  94
  95         /* IRL0=PCI Slot #A
  96          * IRL1=PCI Slot #B
  97          * IRL2=PCI Slot #C
  98          * IRL3=PCI Slot #D
  99          * IRL4=CF Card
 100          * IRL5=CF Card Insert
 101          * IRL6=M66596
 102          * IRL7=SD Card
 103          * IRL8=Touch Panel
 104          * IRL9=SCI
 105          * IRL10=Serial
 106          * IRL11=Extention #A
 107          * IRL11=Extention #B
 108          * IRL12=Debug LAN
 109          * IRL13=Push Switch
 110          * IRL14=ZiggBee IO
 111          */
 112
 113         for (i=0; i<15; i++)
 114                 make_r7780rp_irq(i);
 115 }