arch/sh/boards/renesas/hs7751rvoip/irq.c

   1 /*
   2  * linux/arch/sh/boards/renesas/hs7751rvoip/irq.c
   3  *
   4  * Copyright (C) 2000  Kazumoto Kojima
   5  *
   6  * Renesas Technology Sales HS7751RVoIP Support.
   7  *
   8  * Modified for HS7751RVoIP by
   9  * Atom Create Engineering Co., Ltd. 2002.
  10  * Lineo uSolutions, Inc. 2003.
  11  */
  12
  13 #include <linux/config.h>
  14 #include <linux/init.h>
  15 #include <linux/irq.h>
  16 #include <asm/io.h>
  17 #include <asm/irq.h>
  18 #include <asm/hs7751rvoip/hs7751rvoip.h>
  19
  20 static int mask_pos[] = {8, 9, 10, 11, 12, 13, 0, 1, 2, 3, 4, 5, 6, 7};
  21
  22 static void enable_hs7751rvoip_irq(unsigned int irq);
  23 static void disable_hs7751rvoip_irq(unsigned int irq);
  24
  25 /* shutdown is same as "disable" */
  26 #define shutdown_hs7751rvoip_irq disable_hs7751rvoip_irq
  27
  28 static void ack_hs7751rvoip_irq(unsigned int irq);
  29 static void end_hs7751rvoip_irq(unsigned int irq);
  30
  31 static unsigned int startup_hs7751rvoip_irq(unsigned int irq)
  32 {
  33         enable_hs7751rvoip_irq(irq);
  34         return 0; /* never anything pending */
  35 }
  36
  37 static void disable_hs7751rvoip_irq(unsigned int irq)
  38 {
  39         unsigned long flags;
  40         unsigned short val;
  41         unsigned short mask = 0xffff ^ (0x0001 << mask_pos[irq]);
  42
  43         /* Set the priority in IPR to 0 */
  44         local_irq_save(flags);
  45         val = ctrl_inw(IRLCNTR3);
  46         val &= mask;
  47         ctrl_outw(val, IRLCNTR3);
  48         local_irq_restore(flags);
  49 }
  50
  51 static void enable_hs7751rvoip_irq(unsigned int irq)
  52 {
  53         unsigned long flags;
  54         unsigned short val;
  55         unsigned short value = (0x0001 << mask_pos[irq]);
  56
  57         /* Set priority in IPR back to original value */
  58         local_irq_save(flags);
  59         val = ctrl_inw(IRLCNTR3);
  60         val |= value;
  61         ctrl_outw(val, IRLCNTR3);
  62         local_irq_restore(flags);
  63 }
  64
  65 static void ack_hs7751rvoip_irq(unsigned int irq)
  66 {
  67         disable_hs7751rvoip_irq(irq);
  68 }
  69
  70 static void end_hs7751rvoip_irq(unsigned int irq)
  71 {
  72         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  73                 enable_hs7751rvoip_irq(irq);
  74 }
  75
  76 static struct hw_interrupt_type hs7751rvoip_irq_type = {
  77         "HS7751RVoIP IRQ",
  78         startup_hs7751rvoip_irq,
  79         shutdown_hs7751rvoip_irq,
  80         enable_hs7751rvoip_irq,
  81         disable_hs7751rvoip_irq,
  82         ack_hs7751rvoip_irq,
  83         end_hs7751rvoip_irq,
  84 };
  85
  86 static void make_hs7751rvoip_irq(unsigned int irq)
  87 {
  88         disable_irq_nosync(irq);
  89         irq_desc[irq].handler = &hs7751rvoip_irq_type;
  90         disable_hs7751rvoip_irq(irq);
  91 }
  92
  93 /*
  94  * Initialize IRQ setting
  95  */
  96 void __init init_hs7751rvoip_IRQ(void)
  97 {
  98         int i;
  99
 100         /* IRL0=ON HOOK1
 101          * IRL1=OFF HOOK1
 102          * IRL2=ON HOOK2
 103          * IRL3=OFF HOOK2
 104          * IRL4=Ringing Detection
 105          * IRL5=CODEC
 106          * IRL6=Ethernet
 107          * IRL7=Ethernet Hub
 108          * IRL8=USB Communication
 109          * IRL9=USB Connection
 110          * IRL10=USB DMA
 111          * IRL11=CF Card
 112          * IRL12=PCMCIA
 113          * IRL13=PCI Slot
 114          */
 115         ctrl_outw(0x9876, IRLCNTR1);
 116         ctrl_outw(0xdcba, IRLCNTR2);
 117         ctrl_outw(0x0050, IRLCNTR4);
 118         ctrl_outw(0x4321, IRLCNTR5);
 119
 120         for (i=0; i<14; i++)
 121                 make_hs7751rvoip_irq(i);
 122 }