arch/arm/mach-w90x900/irq.c

   1 /*
   2  * linux/arch/arm/mach-w90x900/irq.c
   3  *
   4  * based on linux/arch/arm/plat-s3c24xx/irq.c by Ben Dooks
   5  *
   6  * Copyright (c) 2008 Nuvoton technology corporation
   7  * All rights reserved.
   8  *
   9  * Wan ZongShun <mcuos.com@gmail.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation;version 2 of the License.
  14  *
  15  */
  16
  17 #include <linux/init.h>
  18 #include <linux/module.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/ioport.h>
  21 #include <linux/ptrace.h>
  22 #include <linux/sysdev.h>
  23 #include <linux/io.h>
  24
  25 #include <asm/irq.h>
  26 #include <asm/mach/irq.h>
  27
  28 #include <mach/hardware.h>
  29 #include <mach/regs-irq.h>
  30
  31 struct group_irq {
  32         unsigned long           gpen;
  33         unsigned int            enabled;
  34         void                    (*enable)(struct group_irq *, int enable);
  35 };
  36
  37 static DEFINE_SPINLOCK(groupirq_lock);
  38
  39 #define DEFINE_GROUP(_name, _ctrlbit, _num)                             \
  40 struct group_irq group_##_name = {                                      \
  41                 .enable         = nuc900_group_enable,                  \
  42                 .gpen           = ((1 << _num) - 1) << _ctrlbit,        \
  43         }
  44
  45 static void nuc900_group_enable(struct group_irq *gpirq, int enable);
  46
  47 static DEFINE_GROUP(nirq0, 0, 4);
  48 static DEFINE_GROUP(nirq1, 4, 4);
  49 static DEFINE_GROUP(usbh, 8, 2);
  50 static DEFINE_GROUP(ottimer, 16, 3);
  51 static DEFINE_GROUP(gdma, 20, 2);
  52 static DEFINE_GROUP(sc, 24, 2);
  53 static DEFINE_GROUP(i2c, 26, 2);
  54 static DEFINE_GROUP(ps2, 28, 2);
  55
  56 static int group_irq_enable(struct group_irq *group_irq)
  57 {
  58         unsigned long flags;
  59
  60         spin_lock_irqsave(&groupirq_lock, flags);
  61         if (group_irq->enabled++ == 0)
  62                 (group_irq->enable)(group_irq, 1);
  63         spin_unlock_irqrestore(&groupirq_lock, flags);
  64
  65         return 0;
  66 }
  67
  68 static void group_irq_disable(struct group_irq *group_irq)
  69 {
  70         unsigned long flags;
  71
  72         WARN_ON(group_irq->enabled == 0);
  73
  74         spin_lock_irqsave(&groupirq_lock, flags);
  75         if (--group_irq->enabled == 0)
  76                 (group_irq->enable)(group_irq, 0);
  77         spin_unlock_irqrestore(&groupirq_lock, flags);
  78 }
  79
  80 static void nuc900_group_enable(struct group_irq *gpirq, int enable)
  81 {
  82         unsigned int groupen = gpirq->gpen;
  83         unsigned long regval;
  84
  85         regval = __raw_readl(REG_AIC_GEN);
  86
  87         if (enable)
  88                 regval |= groupen;
  89         else
  90                 regval &= ~groupen;
  91
  92         __raw_writel(regval, REG_AIC_GEN);
  93 }
  94
  95 static void nuc900_irq_mask(struct irq_data *d)
  96 {
  97         struct group_irq *group_irq;
  98
  99         group_irq = NULL;
 100
 101         __raw_writel(1 << d->irq, REG_AIC_MDCR);
 102
 103         switch (d->irq) {
 104         case IRQ_GROUP0:
 105                 group_irq = &group_nirq0;
 106                 break;
 107
 108         case IRQ_GROUP1:
 109                 group_irq = &group_nirq1;
 110                 break;
 111
 112         case IRQ_USBH:
 113                 group_irq = &group_usbh;
 114                 break;
 115
 116         case IRQ_T_INT_GROUP:
 117                 group_irq = &group_ottimer;
 118                 break;
 119
 120         case IRQ_GDMAGROUP:
 121                 group_irq = &group_gdma;
 122                 break;
 123
 124         case IRQ_SCGROUP:
 125                 group_irq = &group_sc;
 126                 break;
 127
 128         case IRQ_I2CGROUP:
 129                 group_irq = &group_i2c;
 130                 break;
 131
 132         case IRQ_P2SGROUP:
 133                 group_irq = &group_ps2;
 134                 break;
 135         }
 136
 137         if (group_irq)
 138                 group_irq_disable(group_irq);
 139 }
 140
 141 /*
 142  * By the w90p910 spec,any irq,only write 1
 143  * to REG_AIC_EOSCR for ACK
 144  */
 145
 146 static void nuc900_irq_ack(struct irq_data *d)
 147 {
 148         __raw_writel(0x01, REG_AIC_EOSCR);
 149 }
 150
 151 static void nuc900_irq_unmask(struct irq_data *d)
 152 {
 153         struct group_irq *group_irq;
 154
 155         group_irq = NULL;
 156
 157         __raw_writel(1 << d->irq, REG_AIC_MECR);
 158
 159         switch (d->irq) {
 160         case IRQ_GROUP0:
 161                 group_irq = &group_nirq0;
 162                 break;
 163
 164         case IRQ_GROUP1:
 165                 group_irq = &group_nirq1;
 166                 break;
 167
 168         case IRQ_USBH:
 169                 group_irq = &group_usbh;
 170                 break;
 171
 172         case IRQ_T_INT_GROUP:
 173                 group_irq = &group_ottimer;
 174                 break;
 175
 176         case IRQ_GDMAGROUP:
 177                 group_irq = &group_gdma;
 178                 break;
 179
 180         case IRQ_SCGROUP:
 181                 group_irq = &group_sc;
 182                 break;
 183
 184         case IRQ_I2CGROUP:
 185                 group_irq = &group_i2c;
 186                 break;
 187
 188         case IRQ_P2SGROUP:
 189                 group_irq = &group_ps2;
 190                 break;
 191         }
 192
 193         if (group_irq)
 194                 group_irq_enable(group_irq);
 195 }
 196
 197 static struct irq_chip nuc900_irq_chip = {
 198         .irq_ack        = nuc900_irq_ack,
 199         .irq_mask       = nuc900_irq_mask,
 200         .irq_unmask     = nuc900_irq_unmask,
 201 };
 202
 203 void __init nuc900_init_irq(void)
 204 {
 205         int irqno;
 206
 207         __raw_writel(0xFFFFFFFE, REG_AIC_MDCR);
 208
 209         for (irqno = IRQ_WDT; irqno <= IRQ_ADC; irqno++) {
 210                 set_irq_chip(irqno, &nuc900_irq_chip);
 211                 set_irq_handler(irqno, handle_level_irq);
 212                 set_irq_flags(irqno, IRQF_VALID);
 213         }
 214 }