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/sysdev.h>
  18
  19 #include <asm/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(unsigned int irq, unsigned int type)
  41 {
  42         unsigned int mask;
  43
  44         if (irq <= 10)
  45                 mask = 1 << irq;
  46         else
  47                 mask = GPIO11_27_MASK(irq);
  48
  49         if (type == IRQT_PROBE) {
  50                 if ((GPIO_IRQ_rising_edge | GPIO_IRQ_falling_edge) & mask)
  51                         return 0;
  52                 type = __IRQT_RISEDGE | __IRQT_FALEDGE;
  53         }
  54
  55         if (type & __IRQT_RISEDGE) {
  56                 GPIO_IRQ_rising_edge |= mask;
  57         } else
  58                 GPIO_IRQ_rising_edge &= ~mask;
  59         if (type & __IRQT_FALEDGE) {
  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(unsigned int irq)
  74 {
  75         GEDR = (1 << irq);
  76 }
  77
  78 static void sa1100_low_gpio_mask(unsigned int irq)
  79 {
  80         ICMR &= ~(1 << irq);
  81 }
  82
  83 static void sa1100_low_gpio_unmask(unsigned int irq)
  84 {
  85         ICMR |= 1 << irq;
  86 }
  87
  88 static int sa1100_low_gpio_wake(unsigned int irq, unsigned int on)
  89 {
  90         if (on)
  91                 PWER |= 1 << irq;
  92         else
  93                 PWER &= ~(1 << irq);
  94         return 0;
  95 }
  96
  97 static struct irq_chip sa1100_low_gpio_chip = {
  98         .name           = "GPIO-l",
  99         .ack            = sa1100_low_gpio_ack,
 100         .mask           = sa1100_low_gpio_mask,
 101         .unmask         = sa1100_low_gpio_unmask,
 102         .set_type       = sa1100_gpio_type,
 103         .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                 desc = irq_desc + irq;
 126                 mask >>= 11;
 127                 do {
 128                         if (mask & 1)
 129                                 desc_handle_irq(irq, desc);
 130                         mask >>= 1;
 131                         irq++;
 132                         desc++;
 133                 } while (mask);
 134
 135                 mask = GEDR & 0xfffff800;
 136         } while (mask);
 137 }
 138
 139 /*
 140  * Like GPIO0 to 10, GPIO11-27 IRQs need to be handled specially.
 141  * In addition, the IRQs are all collected up into one bit in the
 142  * interrupt controller registers.
 143  */
 144 static void sa1100_high_gpio_ack(unsigned int irq)
 145 {
 146         unsigned int mask = GPIO11_27_MASK(irq);
 147
 148         GEDR = mask;
 149 }
 150
 151 static void sa1100_high_gpio_mask(unsigned int irq)
 152 {
 153         unsigned int mask = GPIO11_27_MASK(irq);
 154
 155         GPIO_IRQ_mask &= ~mask;
 156
 157         GRER &= ~mask;
 158         GFER &= ~mask;
 159 }
 160
 161 static void sa1100_high_gpio_unmask(unsigned int irq)
 162 {
 163         unsigned int mask = GPIO11_27_MASK(irq);
 164
 165         GPIO_IRQ_mask |= mask;
 166
 167         GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
 168         GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
 169 }
 170
 171 static int sa1100_high_gpio_wake(unsigned int irq, unsigned int on)
 172 {
 173         if (on)
 174                 PWER |= GPIO11_27_MASK(irq);
 175         else
 176                 PWER &= ~GPIO11_27_MASK(irq);
 177         return 0;
 178 }
 179
 180 static struct irq_chip sa1100_high_gpio_chip = {
 181         .name           = "GPIO-h",
 182         .ack            = sa1100_high_gpio_ack,
 183         .mask           = sa1100_high_gpio_mask,
 184         .unmask         = sa1100_high_gpio_unmask,
 185         .set_type       = sa1100_gpio_type,
 186         .set_wake       = sa1100_high_gpio_wake,
 187 };
 188
 189 /*
 190  * We don't need to ACK IRQs on the SA1100 unless they're GPIOs
 191  * this is for internal IRQs i.e. from 11 to 31.
 192  */
 193 static void sa1100_mask_irq(unsigned int irq)
 194 {
 195         ICMR &= ~(1 << irq);
 196 }
 197
 198 static void sa1100_unmask_irq(unsigned int irq)
 199 {
 200         ICMR |= (1 << irq);
 201 }
 202
 203 /*
 204  * Apart form GPIOs, only the RTC alarm can be a wakeup event.
 205  */
 206 static int sa1100_set_wake(unsigned int irq, unsigned int on)
 207 {
 208         if (irq == IRQ_RTCAlrm) {
 209                 if (on)
 210                         PWER |= PWER_RTC;
 211                 else
 212                         PWER &= ~PWER_RTC;
 213                 return 0;
 214         }
 215         return -EINVAL;
 216 }
 217
 218 static struct irq_chip sa1100_normal_chip = {
 219         .name           = "SC",
 220         .ack            = sa1100_mask_irq,
 221         .mask           = sa1100_mask_irq,
 222         .unmask         = sa1100_unmask_irq,
 223         .set_wake       = sa1100_set_wake,
 224 };
 225
 226 static struct resource irq_resource = {
 227         .name   = "irqs",
 228         .start  = 0x90050000,
 229         .end    = 0x9005ffff,
 230 };
 231
 232 static struct sa1100irq_state {
 233         unsigned int    saved;
 234         unsigned int    icmr;
 235         unsigned int    iclr;
 236         unsigned int    iccr;
 237 } sa1100irq_state;
 238
 239 static int sa1100irq_suspend(struct sys_device *dev, pm_message_t state)
 240 {
 241         struct sa1100irq_state *st = &sa1100irq_state;
 242
 243         st->saved = 1;
 244         st->icmr = ICMR;
 245         st->iclr = ICLR;
 246         st->iccr = ICCR;
 247
 248         /*
 249          * Disable all GPIO-based interrupts.
 250          */
 251         ICMR &= ~(IC_GPIO11_27|IC_GPIO10|IC_GPIO9|IC_GPIO8|IC_GPIO7|
 252                   IC_GPIO6|IC_GPIO5|IC_GPIO4|IC_GPIO3|IC_GPIO2|
 253                   IC_GPIO1|IC_GPIO0);
 254
 255         /*
 256          * Set the appropriate edges for wakeup.
 257          */
 258         GRER = PWER & GPIO_IRQ_rising_edge;
 259         GFER = PWER & GPIO_IRQ_falling_edge;
 260
 261         /*
 262          * Clear any pending GPIO interrupts.
 263          */
 264         GEDR = GEDR;
 265
 266         return 0;
 267 }
 268
 269 static int sa1100irq_resume(struct sys_device *dev)
 270 {
 271         struct sa1100irq_state *st = &sa1100irq_state;
 272
 273         if (st->saved) {
 274                 ICCR = st->iccr;
 275                 ICLR = st->iclr;
 276
 277                 GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
 278                 GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
 279
 280                 ICMR = st->icmr;
 281         }
 282         return 0;
 283 }
 284
 285 static struct sysdev_class sa1100irq_sysclass = {
 286         set_kset_name("sa11x0-irq"),
 287         .suspend        = sa1100irq_suspend,
 288         .resume         = sa1100irq_resume,
 289 };
 290
 291 static struct sys_device sa1100irq_device = {
 292         .id             = 0,
 293         .cls            = &sa1100irq_sysclass,
 294 };
 295
 296 static int __init sa1100irq_init_devicefs(void)
 297 {
 298         sysdev_class_register(&sa1100irq_sysclass);
 299         return sysdev_register(&sa1100irq_device);
 300 }
 301
 302 device_initcall(sa1100irq_init_devicefs);
 303
 304 void __init sa1100_init_irq(void)
 305 {
 306         unsigned int irq;
 307
 308         request_resource(&iomem_resource, &irq_resource);
 309
 310         /* disable all IRQs */
 311         ICMR = 0;
 312
 313         /* all IRQs are IRQ, not FIQ */
 314         ICLR = 0;
 315
 316         /* clear all GPIO edge detects */
 317         GFER = 0;
 318         GRER = 0;
 319         GEDR = -1;
 320
 321         /*
 322          * Whatever the doc says, this has to be set for the wait-on-irq
 323          * instruction to work... on a SA1100 rev 9 at least.
 324          */
 325         ICCR = 1;
 326
 327         for (irq = 0; irq <= 10; irq++) {
 328                 set_irq_chip(irq, &sa1100_low_gpio_chip);
 329                 set_irq_handler(irq, handle_edge_irq);
 330                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 331         }
 332
 333         for (irq = 12; irq <= 31; irq++) {
 334                 set_irq_chip(irq, &sa1100_normal_chip);
 335                 set_irq_handler(irq, handle_level_irq);
 336                 set_irq_flags(irq, IRQF_VALID);
 337         }
 338
 339         for (irq = 32; irq <= 48; irq++) {
 340                 set_irq_chip(irq, &sa1100_high_gpio_chip);
 341                 set_irq_handler(irq, handle_edge_irq);
 342                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 343         }
 344
 345         /*
 346          * Install handler for GPIO 11-27 edge detect interrupts
 347          */
 348         set_irq_chip(IRQ_GPIO11_27, &sa1100_normal_chip);
 349         set_irq_chained_handler(IRQ_GPIO11_27, sa1100_high_gpio_handler);
 350 }