arch/sh/boards/renesas/rts7751r2d/irq.c

   1 /*
   2  * linux/arch/sh/boards/renesas/rts7751r2d/irq.c
   3  *
   4  * Copyright (C) 2000  Kazumoto Kojima
   5  *
   6  * Renesas Technology Sales RTS7751R2D Support.
   7  *
   8  * Modified for RTS7751R2D by
   9  * Atom Create Engineering Co., Ltd. 2002.
  10  */
  11
  12 #include <linux/config.h>
  13 #include <linux/init.h>
  14 #include <linux/irq.h>
  15 #include <asm/io.h>
  16 #include <asm/irq.h>
  17 #include <asm/rts7751r2d/rts7751r2d.h>
  18
  19 #if defined(CONFIG_RTS7751R2D_REV11)
  20 static int mask_pos[] = {11, 9, 8, 12, 10, 6, 5, 4, 7, 14, 13, 0, 0, 0, 0};
  21 #else
  22 static int mask_pos[] = {6, 11, 9, 8, 12, 10, 5, 4, 7, 14, 13, 0, 0, 0, 0};
  23 #endif
  24
  25 extern int voyagergx_irq_demux(int irq);
  26 extern void setup_voyagergx_irq(void);
  27
  28 static void enable_rts7751r2d_irq(unsigned int irq);
  29 static void disable_rts7751r2d_irq(unsigned int irq);
  30
  31 /* shutdown is same as "disable" */
  32 #define shutdown_rts7751r2d_irq disable_rts7751r2d_irq
  33
  34 static void ack_rts7751r2d_irq(unsigned int irq);
  35 static void end_rts7751r2d_irq(unsigned int irq);
  36
  37 static unsigned int startup_rts7751r2d_irq(unsigned int irq)
  38 {
  39         enable_rts7751r2d_irq(irq);
  40         return 0; /* never anything pending */
  41 }
  42
  43 static void disable_rts7751r2d_irq(unsigned int irq)
  44 {
  45         unsigned long flags;
  46         unsigned short val;
  47         unsigned short mask = 0xffff ^ (0x0001 << mask_pos[irq]);
  48
  49         /* Set the priority in IPR to 0 */
  50         local_irq_save(flags);
  51         val = ctrl_inw(IRLCNTR1);
  52         val &= mask;
  53         ctrl_outw(val, IRLCNTR1);
  54         local_irq_restore(flags);
  55 }
  56
  57 static void enable_rts7751r2d_irq(unsigned int irq)
  58 {
  59         unsigned long flags;
  60         unsigned short val;
  61         unsigned short value = (0x0001 << mask_pos[irq]);
  62
  63         /* Set priority in IPR back to original value */
  64         local_irq_save(flags);
  65         val = ctrl_inw(IRLCNTR1);
  66         val |= value;
  67         ctrl_outw(val, IRLCNTR1);
  68         local_irq_restore(flags);
  69 }
  70
  71 int rts7751r2d_irq_demux(int irq)
  72 {
  73         int demux_irq;
  74
  75         demux_irq = voyagergx_irq_demux(irq);
  76         return demux_irq;
  77 }
  78
  79 static void ack_rts7751r2d_irq(unsigned int irq)
  80 {
  81         disable_rts7751r2d_irq(irq);
  82 }
  83
  84 static void end_rts7751r2d_irq(unsigned int irq)
  85 {
  86         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  87                 enable_rts7751r2d_irq(irq);
  88 }
  89
  90 static struct hw_interrupt_type rts7751r2d_irq_type = {
  91         "RTS7751R2D IRQ",
  92         startup_rts7751r2d_irq,
  93         shutdown_rts7751r2d_irq,
  94         enable_rts7751r2d_irq,
  95         disable_rts7751r2d_irq,
  96         ack_rts7751r2d_irq,
  97         end_rts7751r2d_irq,
  98 };
  99
 100 static void make_rts7751r2d_irq(unsigned int irq)
 101 {
 102         disable_irq_nosync(irq);
 103         irq_desc[irq].handler = &rts7751r2d_irq_type;
 104         disable_rts7751r2d_irq(irq);
 105 }
 106
 107 /*
 108  * Initialize IRQ setting
 109  */
 110 void __init init_rts7751r2d_IRQ(void)
 111 {
 112         int i;
 113
 114         /* IRL0=KEY Input
 115          * IRL1=Ethernet
 116          * IRL2=CF Card
 117          * IRL3=CF Card Insert
 118          * IRL4=PCMCIA
 119          * IRL5=VOYAGER
 120          * IRL6=RTC Alarm
 121          * IRL7=RTC Timer
 122          * IRL8=SD Card
 123          * IRL9=PCI Slot #1
 124          * IRL10=PCI Slot #2
 125          * IRL11=Extention #0
 126          * IRL12=Extention #1
 127          * IRL13=Extention #2
 128          * IRL14=Extention #3
 129          */
 130
 131         for (i=0; i<15; i++)
 132                 make_rts7751r2d_irq(i);
 133
 134         setup_voyagergx_irq();
 135 }