arch/arm/plat-s5p/irq-gpioint.c

   1 /* linux/arch/arm/plat-s5p/irq-gpioint.c
   2  *
   3  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
   4  * Author: Kyungmin Park <kyungmin.park@samsung.com>
   5  * Author: Joonyoung Shim <jy0922.shim@samsung.com>
   6  * Author: Marek Szyprowski <m.szyprowski@samsung.com>
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  *
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/irq.h>
  18 #include <linux/io.h>
  19 #include <linux/gpio.h>
  20
  21 #include <mach/map.h>
  22 #include <plat/gpio-core.h>
  23 #include <plat/gpio-cfg.h>
  24
  25 #define S5P_GPIOREG(x)                  (S5P_VA_GPIO + (x))
  26
  27 #define GPIOINT_CON_OFFSET              0x700
  28 #define GPIOINT_MASK_OFFSET             0x900
  29 #define GPIOINT_PEND_OFFSET             0xA00
  30
  31 static struct s3c_gpio_chip *irq_chips[S5P_GPIOINT_GROUP_MAXNR];
  32
  33 static int s5p_gpioint_get_group(struct irq_data *data)
  34 {
  35         struct gpio_chip *chip = irq_data_get_irq_data(data);
  36         struct s3c_gpio_chip *s3c_chip = container_of(chip,
  37                         struct s3c_gpio_chip, chip);
  38         int group;
  39
  40         for (group = 0; group < S5P_GPIOINT_GROUP_MAXNR; group++)
  41                 if (s3c_chip == irq_chips[group])
  42                         break;
  43
  44         return group;
  45 }
  46
  47 static int s5p_gpioint_get_offset(struct irq_data *data)
  48 {
  49         struct gpio_chip *chip = irq_data_get_irq_data(data);
  50         struct s3c_gpio_chip *s3c_chip = container_of(chip,
  51                         struct s3c_gpio_chip, chip);
  52
  53         return data->irq - s3c_chip->irq_base;
  54 }
  55
  56 static void s5p_gpioint_ack(struct irq_data *data)
  57 {
  58         int group, offset, pend_offset;
  59         unsigned int value;
  60
  61         group = s5p_gpioint_get_group(data);
  62         offset = s5p_gpioint_get_offset(data);
  63         pend_offset = group << 2;
  64
  65         value = __raw_readl(S5P_GPIOREG(GPIOINT_PEND_OFFSET) + pend_offset);
  66         value |= 1 << offset;
  67         __raw_writel(value, S5P_GPIOREG(GPIOINT_PEND_OFFSET) + pend_offset);
  68 }
  69
  70 static void s5p_gpioint_mask(struct irq_data *data)
  71 {
  72         int group, offset, mask_offset;
  73         unsigned int value;
  74
  75         group = s5p_gpioint_get_group(data);
  76         offset = s5p_gpioint_get_offset(data);
  77         mask_offset = group << 2;
  78
  79         value = __raw_readl(S5P_GPIOREG(GPIOINT_MASK_OFFSET) + mask_offset);
  80         value |= 1 << offset;
  81         __raw_writel(value, S5P_GPIOREG(GPIOINT_MASK_OFFSET) + mask_offset);
  82 }
  83
  84 static void s5p_gpioint_unmask(struct irq_data *data)
  85 {
  86         int group, offset, mask_offset;
  87         unsigned int value;
  88
  89         group = s5p_gpioint_get_group(data);
  90         offset = s5p_gpioint_get_offset(data);
  91         mask_offset = group << 2;
  92
  93         value = __raw_readl(S5P_GPIOREG(GPIOINT_MASK_OFFSET) + mask_offset);
  94         value &= ~(1 << offset);
  95         __raw_writel(value, S5P_GPIOREG(GPIOINT_MASK_OFFSET) + mask_offset);
  96 }
  97
  98 static void s5p_gpioint_mask_ack(struct irq_data *data)
  99 {
 100         s5p_gpioint_mask(data);
 101         s5p_gpioint_ack(data);
 102 }
 103
 104 static int s5p_gpioint_set_type(struct irq_data *data, unsigned int type)
 105 {
 106         int group, offset, con_offset;
 107         unsigned int value;
 108
 109         group = s5p_gpioint_get_group(data);
 110         offset = s5p_gpioint_get_offset(data);
 111         con_offset = group << 2;
 112
 113         switch (type) {
 114         case IRQ_TYPE_EDGE_RISING:
 115                 type = S5P_IRQ_TYPE_EDGE_RISING;
 116                 break;
 117         case IRQ_TYPE_EDGE_FALLING:
 118                 type = S5P_IRQ_TYPE_EDGE_FALLING;
 119                 break;
 120         case IRQ_TYPE_EDGE_BOTH:
 121                 type = S5P_IRQ_TYPE_EDGE_BOTH;
 122                 break;
 123         case IRQ_TYPE_LEVEL_HIGH:
 124                 type = S5P_IRQ_TYPE_LEVEL_HIGH;
 125                 break;
 126         case IRQ_TYPE_LEVEL_LOW:
 127                 type = S5P_IRQ_TYPE_LEVEL_LOW;
 128                 break;
 129         case IRQ_TYPE_NONE:
 130         default:
 131                 printk(KERN_WARNING "No irq type\n");
 132                 return -EINVAL;
 133         }
 134
 135         value = __raw_readl(S5P_GPIOREG(GPIOINT_CON_OFFSET) + con_offset);
 136         value &= ~(0x7 << (offset * 0x4));
 137         value |= (type << (offset * 0x4));
 138         __raw_writel(value, S5P_GPIOREG(GPIOINT_CON_OFFSET) + con_offset);
 139
 140         return 0;
 141 }
 142
 143 struct irq_chip s5p_gpioint = {
 144         .name           = "s5p_gpioint",
 145         .irq_ack        = s5p_gpioint_ack,
 146         .irq_mask       = s5p_gpioint_mask,
 147         .irq_mask_ack   = s5p_gpioint_mask_ack,
 148         .irq_unmask     = s5p_gpioint_unmask,
 149         .irq_set_type   = s5p_gpioint_set_type,
 150 };
 151
 152 static void s5p_gpioint_handler(unsigned int irq, struct irq_desc *desc)
 153 {
 154         int group, offset, pend_offset, mask_offset;
 155         int real_irq;
 156         unsigned int pend, mask;
 157
 158         for (group = 0; group < S5P_GPIOINT_GROUP_MAXNR; group++) {
 159                 pend_offset = group << 2;
 160                 pend = __raw_readl(S5P_GPIOREG(GPIOINT_PEND_OFFSET) +
 161                                 pend_offset);
 162                 if (!pend)
 163                         continue;
 164
 165                 mask_offset = group << 2;
 166                 mask = __raw_readl(S5P_GPIOREG(GPIOINT_MASK_OFFSET) +
 167                                 mask_offset);
 168                 pend &= ~mask;
 169
 170                 for (offset = 0; offset < 8; offset++) {
 171                         if (pend & (1 << offset)) {
 172                                 struct s3c_gpio_chip *chip = irq_chips[group];
 173                                 if (chip) {
 174                                         real_irq = chip->irq_base + offset;
 175                                         generic_handle_irq(real_irq);
 176                                 }
 177                         }
 178                 }
 179         }
 180 }
 181
 182 static __init int s5p_gpioint_add(struct s3c_gpio_chip *chip)
 183 {
 184         static int used_gpioint_groups = 0;
 185         static bool handler_registered = 0;
 186         int irq, group = chip->group;
 187         int i;
 188
 189         if (used_gpioint_groups >= S5P_GPIOINT_GROUP_COUNT)
 190                 return -ENOMEM;
 191
 192         chip->irq_base = S5P_GPIOINT_BASE +
 193                          used_gpioint_groups * S5P_GPIOINT_GROUP_SIZE;
 194         used_gpioint_groups++;
 195
 196         if (!handler_registered) {
 197                 set_irq_chained_handler(IRQ_GPIOINT, s5p_gpioint_handler);
 198                 handler_registered = 1;
 199         }
 200
 201         irq_chips[group] = chip;
 202         for (i = 0; i < chip->chip.ngpio; i++) {
 203                 irq = chip->irq_base + i;
 204                 set_irq_chip(irq, &s5p_gpioint);
 205                 set_irq_data(irq, &chip->chip);
 206                 set_irq_handler(irq, handle_level_irq);
 207                 set_irq_flags(irq, IRQF_VALID);
 208         }
 209         return 0;
 210 }
 211
 212 int __init s5p_register_gpio_interrupt(int pin)
 213 {
 214         struct s3c_gpio_chip *my_chip = s3c_gpiolib_getchip(pin);
 215         int offset, group;
 216         int ret;
 217
 218         if (!my_chip)
 219                 return -EINVAL;
 220
 221         offset = pin - my_chip->chip.base;
 222         group = my_chip->group;
 223
 224         /* check if the group has been already registered */
 225         if (my_chip->irq_base)
 226                 return my_chip->irq_base + offset;
 227
 228         /* register gpio group */
 229         ret = s5p_gpioint_add(my_chip);
 230         if (ret == 0) {
 231                 my_chip->chip.to_irq = samsung_gpiolib_to_irq;
 232                 printk(KERN_INFO "Registered interrupt support for gpio group %d.\n",
 233                        group);
 234                 return my_chip->irq_base + offset;
 235         }
 236         return ret;
 237 }