arch/arm/mach-lh7a40x/irq-lpd7a40x.c

   1 /* arch/arm/mach-lh7a40x/irq-lpd7a40x.c
   2  *
   3  *  Copyright (C) 2004 Coastal Environmental Systems
   4  *  Copyright (C) 2004 Logic Product Development
   5  *
   6  *  This program is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU General Public License
   8  *  version 2 as published by the Free Software Foundation.
   9  *
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/ptrace.h>
  16
  17 #include <asm/hardware.h>
  18 #include <asm/irq.h>
  19 #include <asm/mach/irq.h>
  20 #include <asm/arch/irqs.h>
  21
  22
  23 static void lh7a40x_ack_cpld_irq (u32 irq)
  24 {
  25         /* CPLD doesn't have ack capability */
  26 }
  27
  28 static void lh7a40x_mask_cpld_irq (u32 irq)
  29 {
  30         switch (irq) {
  31         case IRQ_LPD7A40X_ETH_INT:
  32                 CPLD_INTERRUPTS = CPLD_INTERRUPTS | 0x4;
  33                 break;
  34         case IRQ_LPD7A400_TS:
  35                 CPLD_INTERRUPTS = CPLD_INTERRUPTS | 0x8;
  36                 break;
  37         }
  38 }
  39
  40 static void lh7a40x_unmask_cpld_irq (u32 irq)
  41 {
  42         switch (irq) {
  43         case IRQ_LPD7A40X_ETH_INT:
  44                 CPLD_INTERRUPTS = CPLD_INTERRUPTS & ~ 0x4;
  45                 break;
  46         case IRQ_LPD7A400_TS:
  47                 CPLD_INTERRUPTS = CPLD_INTERRUPTS & ~ 0x8;
  48                 break;
  49         }
  50 }
  51
  52 static struct irqchip lh7a40x_cpld_chip = {
  53         .ack    = lh7a40x_ack_cpld_irq,
  54         .mask   = lh7a40x_mask_cpld_irq,
  55         .unmask = lh7a40x_unmask_cpld_irq,
  56 };
  57
  58 static void lh7a40x_cpld_handler (unsigned int irq, struct irqdesc *desc,
  59                                   struct pt_regs *regs)
  60 {
  61         unsigned int mask = CPLD_INTERRUPTS;
  62
  63         desc->chip->ack (irq);
  64
  65         if ((mask & 0x1) == 0)  /* WLAN */
  66                 IRQ_DISPATCH (IRQ_LPD7A40X_ETH_INT);
  67
  68         if ((mask & 0x2) == 0)  /* Touch */
  69                 IRQ_DISPATCH (IRQ_LPD7A400_TS);
  70
  71         desc->chip->unmask (irq); /* Level-triggered need this */
  72 }
  73
  74
  75   /* IRQ initialization */
  76
  77 void __init lh7a40x_init_board_irq (void)
  78 {
  79         int irq;
  80
  81                 /* Rev A (v2.8): PF0, PF1, PF2, and PF3 are available IRQs.
  82                                  PF7 supports the CPLD.
  83                    Rev B (v3.4): PF0, PF1, and PF2 are available IRQs.
  84                                  PF3 supports the CPLD.
  85                    (Some) LPD7A404 prerelease boards report a version
  86                    number of 0x16, but we force an override since the
  87                    hardware is of the newer variety.
  88                 */
  89
  90         unsigned char cpld_version = CPLD_REVISION;
  91         int pinCPLD;
  92
  93 #if defined CONFIG_MACH_LPD7A404
  94         cpld_version = 0x34;    /* Override, for now */
  95 #endif
  96         pinCPLD = (cpld_version == 0x28) ? 7 : 3;
  97
  98                 /* First, configure user controlled GPIOF interrupts  */
  99
 100         GPIO_PFDD       &= ~0x0f; /* PF0-3 are inputs */
 101         GPIO_INTTYPE1   &= ~0x0f; /* PF0-3 are level triggered */
 102         GPIO_INTTYPE2   &= ~0x0f; /* PF0-3 are active low */
 103         barrier ();
 104         GPIO_GPIOFINTEN |=  0x0f; /* Enable PF0, PF1, PF2, and PF3 IRQs */
 105
 106                 /* Then, configure CPLD interrupt */
 107
 108         CPLD_INTERRUPTS =   0x0c; /* Disable all CPLD interrupts */
 109         GPIO_PFDD       &= ~(1 << pinCPLD); /* Make input */
 110         GPIO_INTTYPE1   |=  (1 << pinCPLD); /* Edge triggered */
 111         GPIO_INTTYPE2   &= ~(1 << pinCPLD); /* Active low */
 112         barrier ();
 113         GPIO_GPIOFINTEN |=  (1 << pinCPLD); /* Enable */
 114
 115                 /* Cascade CPLD interrupts */
 116
 117         for (irq = IRQ_BOARD_START;
 118              irq < IRQ_BOARD_START + NR_IRQ_BOARD; ++irq) {
 119                 set_irq_chip (irq, &lh7a40x_cpld_chip);
 120                 set_irq_handler (irq, do_edge_IRQ);
 121                 set_irq_flags (irq, IRQF_VALID);
 122         }
 123
 124         set_irq_chained_handler ((cpld_version == 0x28)
 125                                  ? IRQ_CPLD_V28
 126                                  : IRQ_CPLD_V34,
 127                                  lh7a40x_cpld_handler);
 128 }