hw/misc/stm32f4xx_syscfg.c

   1 /*
   2  * STM32F4xx SYSCFG
   3  *
   4  * Copyright (c) 2014 Alistair Francis <alistair@alistair23.me>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26 #include "qemu/log.h"
  27 #include "trace.h"
  28 #include "hw/irq.h"
  29 #include "migration/vmstate.h"
  30 #include "hw/misc/stm32f4xx_syscfg.h"
  31
  32 static void stm32f4xx_syscfg_reset(DeviceState *dev)
  33 {
  34     STM32F4xxSyscfgState *s = STM32F4XX_SYSCFG(dev);
  35
  36     s->syscfg_memrmp = 0x00000000;
  37     s->syscfg_pmc = 0x00000000;
  38     s->syscfg_exticr[0] = 0x00000000;
  39     s->syscfg_exticr[1] = 0x00000000;
  40     s->syscfg_exticr[2] = 0x00000000;
  41     s->syscfg_exticr[3] = 0x00000000;
  42     s->syscfg_cmpcr = 0x00000000;
  43 }
  44
  45 static void stm32f4xx_syscfg_set_irq(void *opaque, int irq, int level)
  46 {
  47     STM32F4xxSyscfgState *s = opaque;
  48     int icrreg = irq / 4;
  49     int startbit = (irq & 3) * 4;
  50     uint8_t config = irq / 16;
  51
  52     trace_stm32f4xx_syscfg_set_irq(irq / 16, irq % 16, level);
  53
  54     g_assert(icrreg < SYSCFG_NUM_EXTICR);
  55
  56     if (extract32(s->syscfg_exticr[icrreg], startbit, 4) == config) {
  57         qemu_set_irq(s->gpio_out[irq], level);
  58         trace_stm32f4xx_pulse_exti(irq);
  59    }
  60 }
  61
  62 static uint64_t stm32f4xx_syscfg_read(void *opaque, hwaddr addr,
  63                                      unsigned int size)
  64 {
  65     STM32F4xxSyscfgState *s = opaque;
  66
  67     trace_stm32f4xx_syscfg_read(addr);
  68
  69     switch (addr) {
  70     case SYSCFG_MEMRMP:
  71         return s->syscfg_memrmp;
  72     case SYSCFG_PMC:
  73         return s->syscfg_pmc;
  74     case SYSCFG_EXTICR1...SYSCFG_EXTICR4:
  75         return s->syscfg_exticr[addr / 4 - SYSCFG_EXTICR1 / 4];
  76     case SYSCFG_CMPCR:
  77         return s->syscfg_cmpcr;
  78     default:
  79         qemu_log_mask(LOG_GUEST_ERROR,
  80                       "%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, addr);
  81         return 0;
  82     }
  83 }
  84
  85 static void stm32f4xx_syscfg_write(void *opaque, hwaddr addr,
  86                        uint64_t val64, unsigned int size)
  87 {
  88     STM32F4xxSyscfgState *s = opaque;
  89     uint32_t value = val64;
  90
  91     trace_stm32f4xx_syscfg_write(value, addr);
  92
  93     switch (addr) {
  94     case SYSCFG_MEMRMP:
  95         qemu_log_mask(LOG_UNIMP,
  96                       "%s: Changing the memory mapping isn't supported " \
  97                       "in QEMU\n", __func__);
  98         return;
  99     case SYSCFG_PMC:
 100         qemu_log_mask(LOG_UNIMP,
 101                       "%s: Changing the memory mapping isn't supported " \
 102                       "in QEMU\n", __func__);
 103         return;
 104     case SYSCFG_EXTICR1...SYSCFG_EXTICR4:
 105         s->syscfg_exticr[addr / 4 - SYSCFG_EXTICR1 / 4] = (value & 0xFFFF);
 106         return;
 107     case SYSCFG_CMPCR:
 108         s->syscfg_cmpcr = value;
 109         return;
 110     default:
 111         qemu_log_mask(LOG_GUEST_ERROR,
 112                       "%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, addr);
 113     }
 114 }
 115
 116 static const MemoryRegionOps stm32f4xx_syscfg_ops = {
 117     .read = stm32f4xx_syscfg_read,
 118     .write = stm32f4xx_syscfg_write,
 119     .endianness = DEVICE_NATIVE_ENDIAN,
 120 };
 121
 122 static void stm32f4xx_syscfg_init(Object *obj)
 123 {
 124     STM32F4xxSyscfgState *s = STM32F4XX_SYSCFG(obj);
 125
 126     sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);
 127
 128     memory_region_init_io(&s->mmio, obj, &stm32f4xx_syscfg_ops, s,
 129                           TYPE_STM32F4XX_SYSCFG, 0x400);
 130     sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
 131
 132     qdev_init_gpio_in(DEVICE(obj), stm32f4xx_syscfg_set_irq, 16 * 9);
 133     qdev_init_gpio_out(DEVICE(obj), s->gpio_out, 16);
 134 }
 135
 136 static const VMStateDescription vmstate_stm32f4xx_syscfg = {
 137     .name = TYPE_STM32F4XX_SYSCFG,
 138     .version_id = 1,
 139     .minimum_version_id = 1,
 140     .fields = (VMStateField[]) {
 141         VMSTATE_UINT32(syscfg_memrmp, STM32F4xxSyscfgState),
 142         VMSTATE_UINT32(syscfg_pmc, STM32F4xxSyscfgState),
 143         VMSTATE_UINT32_ARRAY(syscfg_exticr, STM32F4xxSyscfgState,
 144                              SYSCFG_NUM_EXTICR),
 145         VMSTATE_UINT32(syscfg_cmpcr, STM32F4xxSyscfgState),
 146         VMSTATE_END_OF_LIST()
 147     }
 148 };
 149
 150 static void stm32f4xx_syscfg_class_init(ObjectClass *klass, void *data)
 151 {
 152     DeviceClass *dc = DEVICE_CLASS(klass);
 153
 154     dc->reset = stm32f4xx_syscfg_reset;
 155     dc->vmsd = &vmstate_stm32f4xx_syscfg;
 156 }
 157
 158 static const TypeInfo stm32f4xx_syscfg_info = {
 159     .name          = TYPE_STM32F4XX_SYSCFG,
 160     .parent        = TYPE_SYS_BUS_DEVICE,
 161     .instance_size = sizeof(STM32F4xxSyscfgState),
 162     .instance_init = stm32f4xx_syscfg_init,
 163     .class_init    = stm32f4xx_syscfg_class_init,
 164 };
 165
 166 static void stm32f4xx_syscfg_register_types(void)
 167 {
 168     type_register_static(&stm32f4xx_syscfg_info);
 169 }
 170
 171 type_init(stm32f4xx_syscfg_register_types)