hw/gpio/puv3_gpio.c

   1 /*
   2  * GPIO device simulation in PKUnity SoC
   3  *
   4  * Copyright (C) 2010-2012 Guan Xuetao
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation, or any later version.
   9  * See the COPYING file in the top-level directory.
  10  */
  11 #include "hw/hw.h"
  12 #include "hw/sysbus.h"
  13
  14 #undef DEBUG_PUV3
  15 #include "hw/unicore32/puv3.h"
  16
  17 #define TYPE_PUV3_GPIO "puv3_gpio"
  18 #define PUV3_GPIO(obj) OBJECT_CHECK(PUV3GPIOState, (obj), TYPE_PUV3_GPIO)
  19
  20 typedef struct PUV3GPIOState {
  21     SysBusDevice parent_obj;
  22
  23     MemoryRegion iomem;
  24     qemu_irq irq[9];
  25
  26     uint32_t reg_GPLR;
  27     uint32_t reg_GPDR;
  28     uint32_t reg_GPIR;
  29 } PUV3GPIOState;
  30
  31 static uint64_t puv3_gpio_read(void *opaque, hwaddr offset,
  32         unsigned size)
  33 {
  34     PUV3GPIOState *s = opaque;
  35     uint32_t ret = 0;
  36
  37     switch (offset) {
  38     case 0x00:
  39         ret = s->reg_GPLR;
  40         break;
  41     case 0x04:
  42         ret = s->reg_GPDR;
  43         break;
  44     case 0x20:
  45         ret = s->reg_GPIR;
  46         break;
  47     default:
  48         DPRINTF("Bad offset 0x%x\n", offset);
  49     }
  50     DPRINTF("offset 0x%x, value 0x%x\n", offset, ret);
  51
  52     return ret;
  53 }
  54
  55 static void puv3_gpio_write(void *opaque, hwaddr offset,
  56         uint64_t value, unsigned size)
  57 {
  58     PUV3GPIOState *s = opaque;
  59
  60     DPRINTF("offset 0x%x, value 0x%x\n", offset, value);
  61     switch (offset) {
  62     case 0x04:
  63         s->reg_GPDR = value;
  64         break;
  65     case 0x08:
  66         if (s->reg_GPDR & value) {
  67             s->reg_GPLR |= value;
  68         } else {
  69             DPRINTF("Write gpio input port error!");
  70         }
  71         break;
  72     case 0x0c:
  73         if (s->reg_GPDR & value) {
  74             s->reg_GPLR &= ~value;
  75         } else {
  76             DPRINTF("Write gpio input port error!");
  77         }
  78         break;
  79     case 0x10: /* GRER */
  80     case 0x14: /* GFER */
  81     case 0x18: /* GEDR */
  82         break;
  83     case 0x20: /* GPIR */
  84         s->reg_GPIR = value;
  85         break;
  86     default:
  87         DPRINTF("Bad offset 0x%x\n", offset);
  88     }
  89 }
  90
  91 static const MemoryRegionOps puv3_gpio_ops = {
  92     .read = puv3_gpio_read,
  93     .write = puv3_gpio_write,
  94     .impl = {
  95         .min_access_size = 4,
  96         .max_access_size = 4,
  97     },
  98     .endianness = DEVICE_NATIVE_ENDIAN,
  99 };
 100
 101 static int puv3_gpio_init(SysBusDevice *dev)
 102 {
 103     PUV3GPIOState *s = PUV3_GPIO(dev);
 104
 105     s->reg_GPLR = 0;
 106     s->reg_GPDR = 0;
 107
 108     /* FIXME: these irqs not handled yet */
 109     sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOLOW0]);
 110     sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOLOW1]);
 111     sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOLOW2]);
 112     sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOLOW3]);
 113     sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOLOW4]);
 114     sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOLOW5]);
 115     sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOLOW6]);
 116     sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOLOW7]);
 117     sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOHIGH]);
 118
 119     memory_region_init_io(&s->iomem, OBJECT(s), &puv3_gpio_ops, s, "puv3_gpio",
 120             PUV3_REGS_OFFSET);
 121     sysbus_init_mmio(dev, &s->iomem);
 122
 123     return 0;
 124 }
 125
 126 static void puv3_gpio_class_init(ObjectClass *klass, void *data)
 127 {
 128     SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
 129
 130     sdc->init = puv3_gpio_init;
 131 }
 132
 133 static const TypeInfo puv3_gpio_info = {
 134     .name = TYPE_PUV3_GPIO,
 135     .parent = TYPE_SYS_BUS_DEVICE,
 136     .instance_size = sizeof(PUV3GPIOState),
 137     .class_init = puv3_gpio_class_init,
 138 };
 139
 140 static void puv3_gpio_register_type(void)
 141 {
 142     type_register_static(&puv3_gpio_info);
 143 }
 144
 145 type_init(puv3_gpio_register_type)