arch/arm/mach-sa1100/irq.c

   1 /*
   2  * linux/arch/arm/mach-sa1100/irq.c
   3  *
   4  * Copyright (C) 1999-2001 Nicolas Pitre
   5  *
   6  * Generic IRQ handling for the SA11x0, GPIO 11-27 IRQ demultiplexing.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/irq.h>
  16 #include <linux/ioport.h>
  17 #include <linux/syscore_ops.h>
  18
  19 #include <mach/hardware.h>
  20 #include <asm/mach/irq.h>
  21
  22 #include "generic.h"
  23
  24
  25 /*
  26  * SA1100 GPIO edge detection for IRQs:
  27  * IRQs are generated on Falling-Edge, Rising-Edge, or both.
  28  * Use this instead of directly setting GRER/GFER.
  29  */
  30 static int GPIO_IRQ_rising_edge;
  31 static int GPIO_IRQ_falling_edge;
  32 static int GPIO_IRQ_mask = (1 << 11) - 1;
  33
  34 /*
  35  * To get the GPIO number from an IRQ number
  36  */
  37 #define GPIO_11_27_IRQ(i)       ((i) - 21)
  38 #define GPIO11_27_MASK(irq)     (1 << GPIO_11_27_IRQ(irq))
  39
  40 static int sa1100_gpio_type(struct irq_data *d, unsigned int type)
  41 {
  42         unsigned int mask;
  43
  44         if (d->irq <= 10)
  45                 mask = 1 << d->irq;
  46         else
  47                 mask = GPIO11_27_MASK(d->irq);
  48
  49         if (type == IRQ_TYPE_PROBE) {
  50                 if ((GPIO_IRQ_rising_edge | GPIO_IRQ_falling_edge) & mask)
  51                         return 0;
  52                 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
  53         }
  54
  55         if (type & IRQ_TYPE_EDGE_RISING) {
  56                 GPIO_IRQ_rising_edge |= mask;
  57         } else
  58                 GPIO_IRQ_rising_edge &= ~mask;
  59         if (type & IRQ_TYPE_EDGE_FALLING) {
  60                 GPIO_IRQ_falling_edge |= mask;
  61         } else
  62                 GPIO_IRQ_falling_edge &= ~mask;
  63
  64         GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
  65         GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
  66
  67         return 0;
  68 }
  69
  70 /*
  71  * GPIO IRQs must be acknowledged.  This is for IRQs from 0 to 10.
  72  */
  73 static void sa1100_low_gpio_ack(struct irq_data *d)
  74 {
  75         GEDR = (1 << d->irq);
  76 }
  77
  78 static void sa1100_low_gpio_mask(struct irq_data *d)
  79 {
  80         ICMR &= ~(1 << d->irq);
  81 }
  82
  83 static void sa1100_low_gpio_unmask(struct irq_data *d)
  84 {
  85         ICMR |= 1 << d->irq;
  86 }
  87
  88 static int sa1100_low_gpio_wake(struct irq_data *d, unsigned int on)
  89 {
  90         if (on)
  91                 PWER |= 1 << d->irq;
  92         else
  93                 PWER &= ~(1 << d->irq);
  94         return 0;
  95 }
  96
  97 static struct irq_chip sa1100_low_gpio_chip = {
  98         .name           = "GPIO-l",
  99         .irq_ack        = sa1100_low_gpio_ack,
 100         .irq_mask       = sa1100_low_gpio_mask,
 101         .irq_unmask     = sa1100_low_gpio_unmask,
 102         .irq_set_type   = sa1100_gpio_type,
 103         .irq_set_wake   = sa1100_low_gpio_wake,
 104 };
 105
 106 /*
 107  * IRQ11 (GPIO11 through 27) handler.  We enter here with the
 108  * irq_controller_lock held, and IRQs disabled.  Decode the IRQ
 109  * and call the handler.
 110  */
 111 static void
 112 sa1100_high_gpio_handler(unsigned int irq, struct irq_desc *desc)
 113 {
 114         unsigned int mask;
 115
 116         mask = GEDR & 0xfffff800;
 117         do {
 118                 /*
 119                  * clear down all currently active IRQ sources.
 120                  * We will be processing them all.
 121                  */
 122                 GEDR = mask;
 123
 124                 irq = IRQ_GPIO11;
 125                 mask >>= 11;
 126                 do {
 127                         if (mask & 1)
 128                                 generic_handle_irq(irq);
 129                         mask >>= 1;
 130                         irq++;
 131                 } while (mask);
 132
 133                 mask = GEDR & 0xfffff800;
 134         } while (mask);
 135 }
 136
 137 /*
 138  * Like GPIO0 to 10, GPIO11-27 IRQs need to be handled specially.
 139  * In addition, the IRQs are all collected up into one bit in the
 140  * interrupt controller registers.
 141  */
 142 static void sa1100_high_gpio_ack(struct irq_data *d)
 143 {
 144         unsigned int mask = GPIO11_27_MASK(d->irq);
 145
 146         GEDR = mask;
 147 }
 148
 149 static void sa1100_high_gpio_mask(struct irq_data *d)
 150 {
 151         unsigned int mask = GPIO11_27_MASK(d->irq);
 152
 153         GPIO_IRQ_mask &= ~mask;
 154
 155         GRER &= ~mask;
 156         GFER &= ~mask;
 157 }
 158
 159 static void sa1100_high_gpio_unmask(struct irq_data *d)
 160 {
 161         unsigned int mask = GPIO11_27_MASK(d->irq);
 162
 163         GPIO_IRQ_mask |= mask;
 164
 165         GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
 166         GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
 167 }
 168
 169 static int sa1100_high_gpio_wake(struct irq_data *d, unsigned int on)
 170 {
 171         if (on)
 172                 PWER |= GPIO11_27_MASK(d->irq);
 173         else
 174                 PWER &= ~GPIO11_27_MASK(d->irq);
 175         return 0;
 176 }
 177
 178 static struct irq_chip sa1100_high_gpio_chip = {
 179         .name           = "GPIO-h",
 180         .irq_ack        = sa1100_high_gpio_ack,
 181         .irq_mask       = sa1100_high_gpio_mask,
 182         .irq_unmask     = sa1100_high_gpio_unmask,
 183         .irq_set_type   = sa1100_gpio_type,
 184         .irq_set_wake   = sa1100_high_gpio_wake,
 185 };
 186
 187 /*
 188  * We don't need to ACK IRQs on the SA1100 unless they're GPIOs
 189  * this is for internal IRQs i.e. from 11 to 31.
 190  */
 191 static void sa1100_mask_irq(struct irq_data *d)
 192 {
 193         ICMR &= ~(1 << d->irq);
 194 }
 195
 196 static void sa1100_unmask_irq(struct irq_data *d)
 197 {
 198         ICMR |= (1 << d->irq);
 199 }
 200
 201 /*
 202  * Apart form GPIOs, only the RTC alarm can be a wakeup event.
 203  */
 204 static int sa1100_set_wake(struct irq_data *d, unsigned int on)
 205 {
 206         if (d->irq == IRQ_RTCAlrm) {
 207                 if (on)
 208                         PWER |= PWER_RTC;
 209                 else
 210                         PWER &= ~PWER_RTC;
 211                 return 0;
 212         }
 213         return -EINVAL;
 214 }
 215
 216 static struct irq_chip sa1100_normal_chip = {
 217         .name           = "SC",
 218         .irq_ack        = sa1100_mask_irq,
 219         .irq_mask       = sa1100_mask_irq,
 220         .irq_unmask     = sa1100_unmask_irq,
 221         .irq_set_wake   = sa1100_set_wake,
 222 };
 223
 224 static struct resource irq_resource = {
 225         .name   = "irqs",
 226         .start  = 0x90050000,
 227         .end    = 0x9005ffff,
 228 };
 229
 230 static struct sa1100irq_state {
 231         unsigned int    saved;
 232         unsigned int    icmr;
 233         unsigned int    iclr;
 234         unsigned int    iccr;
 235 } sa1100irq_state;
 236
 237 static int sa1100irq_suspend(void)
 238 {
 239         struct sa1100irq_state *st = &sa1100irq_state;
 240
 241         st->saved = 1;
 242         st->icmr = ICMR;
 243         st->iclr = ICLR;
 244         st->iccr = ICCR;
 245
 246         /*
 247          * Disable all GPIO-based interrupts.
 248          */
 249         ICMR &= ~(IC_GPIO11_27|IC_GPIO10|IC_GPIO9|IC_GPIO8|IC_GPIO7|
 250                   IC_GPIO6|IC_GPIO5|IC_GPIO4|IC_GPIO3|IC_GPIO2|
 251                   IC_GPIO1|IC_GPIO0);
 252
 253         /*
 254          * Set the appropriate edges for wakeup.
 255          */
 256         GRER = PWER & GPIO_IRQ_rising_edge;
 257         GFER = PWER & GPIO_IRQ_falling_edge;
 258
 259         /*
 260          * Clear any pending GPIO interrupts.
 261          */
 262         GEDR = GEDR;
 263
 264         return 0;
 265 }
 266
 267 static void sa1100irq_resume(void)
 268 {
 269         struct sa1100irq_state *st = &sa1100irq_state;
 270
 271         if (st->saved) {
 272                 ICCR = st->iccr;
 273                 ICLR = st->iclr;
 274
 275                 GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
 276                 GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
 277
 278                 ICMR = st->icmr;
 279         }
 280 }
 281
 282 static struct syscore_ops sa1100irq_syscore_ops = {
 283         .suspend        = sa1100irq_suspend,
 284         .resume         = sa1100irq_resume,
 285 };
 286
 287 static int __init sa1100irq_init_devicefs(void)
 288 {
 289         register_syscore_ops(&sa1100irq_syscore_ops);
 290         return 0;
 291 }
 292
 293 device_initcall(sa1100irq_init_devicefs);
 294
 295 void __init sa1100_init_irq(void)
 296 {
 297         unsigned int irq;
 298
 299         request_resource(&iomem_resource, &irq_resource);
 300
 301         /* disable all IRQs */
 302         ICMR = 0;
 303
 304         /* all IRQs are IRQ, not FIQ */
 305         ICLR = 0;
 306
 307         /* clear all GPIO edge detects */
 308         GFER = 0;
 309         GRER = 0;
 310         GEDR = -1;
 311
 312         /*
 313          * Whatever the doc says, this has to be set for the wait-on-irq
 314          * instruction to work... on a SA1100 rev 9 at least.
 315          */
 316         ICCR = 1;
 317
 318         for (irq = 0; irq <= 10; irq++) {
 319                 irq_set_chip_and_handler(irq, &sa1100_low_gpio_chip,
 320                                          handle_edge_irq);
 321                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 322         }
 323
 324         for (irq = 12; irq <= 31; irq++) {
 325                 irq_set_chip_and_handler(irq, &sa1100_normal_chip,
 326                                          handle_level_irq);
 327                 set_irq_flags(irq, IRQF_VALID);
 328         }
 329
 330         for (irq = 32; irq <= 48; irq++) {
 331                 irq_set_chip_and_handler(irq, &sa1100_high_gpio_chip,
 332                                          handle_edge_irq);
 333                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 334         }
 335
 336         /*
 337          * Install handler for GPIO 11-27 edge detect interrupts
 338          */
 339         irq_set_chip(IRQ_GPIO11_27, &sa1100_normal_chip);
 340         irq_set_chained_handler(IRQ_GPIO11_27, sa1100_high_gpio_handler);
 341
 342         sa1100_init_gpio();
 343 }