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/device.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 #include "nuc9xx.h"
  32
  33 struct group_irq {
  34         unsigned long           gpen;
  35         unsigned int            enabled;
  36         void                    (*enable)(struct group_irq *, int enable);
  37 };
  38
  39 static DEFINE_SPINLOCK(groupirq_lock);
  40
  41 #define DEFINE_GROUP(_name, _ctrlbit, _num)                             \
  42 struct group_irq group_##_name = {                                      \
  43                 .enable         = nuc900_group_enable,                  \
  44                 .gpen           = ((1 << _num) - 1) << _ctrlbit,        \
  45         }
  46
  47 static void nuc900_group_enable(struct group_irq *gpirq, int enable);
  48
  49 static DEFINE_GROUP(nirq0, 0, 4);
  50 static DEFINE_GROUP(nirq1, 4, 4);
  51 static DEFINE_GROUP(usbh, 8, 2);
  52 static DEFINE_GROUP(ottimer, 16, 3);
  53 static DEFINE_GROUP(gdma, 20, 2);
  54 static DEFINE_GROUP(sc, 24, 2);
  55 static DEFINE_GROUP(i2c, 26, 2);
  56 static DEFINE_GROUP(ps2, 28, 2);
  57
  58 static int group_irq_enable(struct group_irq *group_irq)
  59 {
  60         unsigned long flags;
  61
  62         spin_lock_irqsave(&groupirq_lock, flags);
  63         if (group_irq->enabled++ == 0)
  64                 (group_irq->enable)(group_irq, 1);
  65         spin_unlock_irqrestore(&groupirq_lock, flags);
  66
  67         return 0;
  68 }
  69
  70 static void group_irq_disable(struct group_irq *group_irq)
  71 {
  72         unsigned long flags;
  73
  74         WARN_ON(group_irq->enabled == 0);
  75
  76         spin_lock_irqsave(&groupirq_lock, flags);
  77         if (--group_irq->enabled == 0)
  78                 (group_irq->enable)(group_irq, 0);
  79         spin_unlock_irqrestore(&groupirq_lock, flags);
  80 }
  81
  82 static void nuc900_group_enable(struct group_irq *gpirq, int enable)
  83 {
  84         unsigned int groupen = gpirq->gpen;
  85         unsigned long regval;
  86
  87         regval = __raw_readl(REG_AIC_GEN);
  88
  89         if (enable)
  90                 regval |= groupen;
  91         else
  92                 regval &= ~groupen;
  93
  94         __raw_writel(regval, REG_AIC_GEN);
  95 }
  96
  97 static void nuc900_irq_mask(struct irq_data *d)
  98 {
  99         struct group_irq *group_irq;
 100
 101         group_irq = NULL;
 102
 103         __raw_writel(1 << d->irq, REG_AIC_MDCR);
 104
 105         switch (d->irq) {
 106         case IRQ_GROUP0:
 107                 group_irq = &group_nirq0;
 108                 break;
 109
 110         case IRQ_GROUP1:
 111                 group_irq = &group_nirq1;
 112                 break;
 113
 114         case IRQ_USBH:
 115                 group_irq = &group_usbh;
 116                 break;
 117
 118         case IRQ_T_INT_GROUP:
 119                 group_irq = &group_ottimer;
 120                 break;
 121
 122         case IRQ_GDMAGROUP:
 123                 group_irq = &group_gdma;
 124                 break;
 125
 126         case IRQ_SCGROUP:
 127                 group_irq = &group_sc;
 128                 break;
 129
 130         case IRQ_I2CGROUP:
 131                 group_irq = &group_i2c;
 132                 break;
 133
 134         case IRQ_P2SGROUP:
 135                 group_irq = &group_ps2;
 136                 break;
 137         }
 138
 139         if (group_irq)
 140                 group_irq_disable(group_irq);
 141 }
 142
 143 /*
 144  * By the w90p910 spec,any irq,only write 1
 145  * to REG_AIC_EOSCR for ACK
 146  */
 147
 148 static void nuc900_irq_ack(struct irq_data *d)
 149 {
 150         __raw_writel(0x01, REG_AIC_EOSCR);
 151 }
 152
 153 static void nuc900_irq_unmask(struct irq_data *d)
 154 {
 155         struct group_irq *group_irq;
 156
 157         group_irq = NULL;
 158
 159         __raw_writel(1 << d->irq, REG_AIC_MECR);
 160
 161         switch (d->irq) {
 162         case IRQ_GROUP0:
 163                 group_irq = &group_nirq0;
 164                 break;
 165
 166         case IRQ_GROUP1:
 167                 group_irq = &group_nirq1;
 168                 break;
 169
 170         case IRQ_USBH:
 171                 group_irq = &group_usbh;
 172                 break;
 173
 174         case IRQ_T_INT_GROUP:
 175                 group_irq = &group_ottimer;
 176                 break;
 177
 178         case IRQ_GDMAGROUP:
 179                 group_irq = &group_gdma;
 180                 break;
 181
 182         case IRQ_SCGROUP:
 183                 group_irq = &group_sc;
 184                 break;
 185
 186         case IRQ_I2CGROUP:
 187                 group_irq = &group_i2c;
 188                 break;
 189
 190         case IRQ_P2SGROUP:
 191                 group_irq = &group_ps2;
 192                 break;
 193         }
 194
 195         if (group_irq)
 196                 group_irq_enable(group_irq);
 197 }
 198
 199 static struct irq_chip nuc900_irq_chip = {
 200         .irq_ack        = nuc900_irq_ack,
 201         .irq_mask       = nuc900_irq_mask,
 202         .irq_unmask     = nuc900_irq_unmask,
 203 };
 204
 205 void __init nuc900_init_irq(void)
 206 {
 207         int irqno;
 208
 209         __raw_writel(0xFFFFFFFE, REG_AIC_MDCR);
 210
 211         for (irqno = IRQ_WDT; irqno <= IRQ_ADC; irqno++) {
 212                 irq_set_chip_and_handler(irqno, &nuc900_irq_chip,
 213                                          handle_level_irq);
 214                 irq_clear_status_flags(irqno, IRQ_NOREQUEST);
 215         }
 216 }