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