arch/arm/mach-w90x900/irq.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/arch/arm/mach-w90x900/irq.c
   4  *
   5  * based on linux/arch/arm/plat-s3c24xx/irq.c by Ben Dooks
   6  *
   7  * Copyright (c) 2008 Nuvoton technology corporation
   8  * All rights reserved.
   9  *
  10  * Wan ZongShun <mcuos.com@gmail.com>
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/ioport.h>
  17 #include <linux/ptrace.h>
  18 #include <linux/device.h>
  19 #include <linux/io.h>
  20
  21 #include <asm/irq.h>
  22 #include <asm/mach/irq.h>
  23
  24 #include <mach/hardware.h>
  25 #include <mach/regs-irq.h>
  26
  27 #include "nuc9xx.h"
  28
  29 struct group_irq {
  30         unsigned long           gpen;
  31         unsigned int            enabled;
  32         void                    (*enable)(struct group_irq *, int enable);
  33 };
  34
  35 static DEFINE_SPINLOCK(groupirq_lock);
  36
  37 #define DEFINE_GROUP(_name, _ctrlbit, _num)                             \
  38 struct group_irq group_##_name = {                                      \
  39                 .enable         = nuc900_group_enable,                  \
  40                 .gpen           = ((1 << _num) - 1) << _ctrlbit,        \
  41         }
  42
  43 static void nuc900_group_enable(struct group_irq *gpirq, int enable);
  44
  45 static DEFINE_GROUP(nirq0, 0, 4);
  46 static DEFINE_GROUP(nirq1, 4, 4);
  47 static DEFINE_GROUP(usbh, 8, 2);
  48 static DEFINE_GROUP(ottimer, 16, 3);
  49 static DEFINE_GROUP(gdma, 20, 2);
  50 static DEFINE_GROUP(sc, 24, 2);
  51 static DEFINE_GROUP(i2c, 26, 2);
  52 static DEFINE_GROUP(ps2, 28, 2);
  53
  54 static int group_irq_enable(struct group_irq *group_irq)
  55 {
  56         unsigned long flags;
  57
  58         spin_lock_irqsave(&groupirq_lock, flags);
  59         if (group_irq->enabled++ == 0)
  60                 (group_irq->enable)(group_irq, 1);
  61         spin_unlock_irqrestore(&groupirq_lock, flags);
  62
  63         return 0;
  64 }
  65
  66 static void group_irq_disable(struct group_irq *group_irq)
  67 {
  68         unsigned long flags;
  69
  70         WARN_ON(group_irq->enabled == 0);
  71
  72         spin_lock_irqsave(&groupirq_lock, flags);
  73         if (--group_irq->enabled == 0)
  74                 (group_irq->enable)(group_irq, 0);
  75         spin_unlock_irqrestore(&groupirq_lock, flags);
  76 }
  77
  78 static void nuc900_group_enable(struct group_irq *gpirq, int enable)
  79 {
  80         unsigned int groupen = gpirq->gpen;
  81         unsigned long regval;
  82
  83         regval = __raw_readl(REG_AIC_GEN);
  84
  85         if (enable)
  86                 regval |= groupen;
  87         else
  88                 regval &= ~groupen;
  89
  90         __raw_writel(regval, REG_AIC_GEN);
  91 }
  92
  93 static void nuc900_irq_mask(struct irq_data *d)
  94 {
  95         struct group_irq *group_irq;
  96
  97         group_irq = NULL;
  98
  99         __raw_writel(1 << d->irq, REG_AIC_MDCR);
 100
 101         switch (d->irq) {
 102         case IRQ_GROUP0:
 103                 group_irq = &group_nirq0;
 104                 break;
 105
 106         case IRQ_GROUP1:
 107                 group_irq = &group_nirq1;
 108                 break;
 109
 110         case IRQ_USBH:
 111                 group_irq = &group_usbh;
 112                 break;
 113
 114         case IRQ_T_INT_GROUP:
 115                 group_irq = &group_ottimer;
 116                 break;
 117
 118         case IRQ_GDMAGROUP:
 119                 group_irq = &group_gdma;
 120                 break;
 121
 122         case IRQ_SCGROUP:
 123                 group_irq = &group_sc;
 124                 break;
 125
 126         case IRQ_I2CGROUP:
 127                 group_irq = &group_i2c;
 128                 break;
 129
 130         case IRQ_P2SGROUP:
 131                 group_irq = &group_ps2;
 132                 break;
 133         }
 134
 135         if (group_irq)
 136                 group_irq_disable(group_irq);
 137 }
 138
 139 /*
 140  * By the w90p910 spec,any irq,only write 1
 141  * to REG_AIC_EOSCR for ACK
 142  */
 143
 144 static void nuc900_irq_ack(struct irq_data *d)
 145 {
 146         __raw_writel(0x01, REG_AIC_EOSCR);
 147 }
 148
 149 static void nuc900_irq_unmask(struct irq_data *d)
 150 {
 151         struct group_irq *group_irq;
 152
 153         group_irq = NULL;
 154
 155         __raw_writel(1 << d->irq, REG_AIC_MECR);
 156
 157         switch (d->irq) {
 158         case IRQ_GROUP0:
 159                 group_irq = &group_nirq0;
 160                 break;
 161
 162         case IRQ_GROUP1:
 163                 group_irq = &group_nirq1;
 164                 break;
 165
 166         case IRQ_USBH:
 167                 group_irq = &group_usbh;
 168                 break;
 169
 170         case IRQ_T_INT_GROUP:
 171                 group_irq = &group_ottimer;
 172                 break;
 173
 174         case IRQ_GDMAGROUP:
 175                 group_irq = &group_gdma;
 176                 break;
 177
 178         case IRQ_SCGROUP:
 179                 group_irq = &group_sc;
 180                 break;
 181
 182         case IRQ_I2CGROUP:
 183                 group_irq = &group_i2c;
 184                 break;
 185
 186         case IRQ_P2SGROUP:
 187                 group_irq = &group_ps2;
 188                 break;
 189         }
 190
 191         if (group_irq)
 192                 group_irq_enable(group_irq);
 193 }
 194
 195 static struct irq_chip nuc900_irq_chip = {
 196         .irq_ack        = nuc900_irq_ack,
 197         .irq_mask       = nuc900_irq_mask,
 198         .irq_unmask     = nuc900_irq_unmask,
 199 };
 200
 201 void __init nuc900_init_irq(void)
 202 {
 203         int irqno;
 204
 205         __raw_writel(0xFFFFFFFE, REG_AIC_MDCR);
 206
 207         for (irqno = IRQ_WDT; irqno <= IRQ_ADC; irqno++) {
 208                 irq_set_chip_and_handler(irqno, &nuc900_irq_chip,
 209                                          handle_level_irq);
 210                 irq_clear_status_flags(irqno, IRQ_NOREQUEST);
 211         }
 212 }