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STM32F2xx: Add the ADC device
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Add the STM32F2xx ADC device. This device randomly
generates values on each read.

This also includes creating a hw/adc directory.

Signed-off-by: Alistair Francis <alistair@alistair23.me>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 3240e660adaf537f55a63ce06096e844aece8cda.1474742262.git.alistair@alistair23.me
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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@alistair23 @pm215
alistair23 authored and pm215 committed Oct 4, 2016
1 parent cbcb93e commit d1f711d
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Showing 5 changed files with 396 additions and 0 deletions.
1 change: 1 addition & 0 deletions default-configs/arm-softmmu.mak
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Expand Up @@ -86,6 +86,7 @@ CONFIG_ZYNQ=y
CONFIG_STM32F2XX_TIMER=y
CONFIG_STM32F2XX_USART=y
CONFIG_STM32F2XX_SYSCFG=y
CONFIG_STM32F2XX_ADC=y
CONFIG_STM32F205_SOC=y

CONFIG_VERSATILE_PCI=y
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1 change: 1 addition & 0 deletions hw/Makefile.objs
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@@ -1,5 +1,6 @@
devices-dirs-$(call land, $(CONFIG_VIRTIO),$(call land,$(CONFIG_VIRTFS),$(CONFIG_PCI))) += 9pfs/
devices-dirs-$(CONFIG_ACPI) += acpi/
devices-dirs-$(CONFIG_SOFTMMU) += adc/
devices-dirs-$(CONFIG_SOFTMMU) += audio/
devices-dirs-$(CONFIG_SOFTMMU) += block/
devices-dirs-$(CONFIG_SOFTMMU) += bt/
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1 change: 1 addition & 0 deletions hw/adc/Makefile.objs
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@@ -0,0 +1 @@
obj-$(CONFIG_STM32F2XX_ADC) += stm32f2xx_adc.o
306 changes: 306 additions & 0 deletions hw/adc/stm32f2xx_adc.c
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@@ -0,0 +1,306 @@
/*
* STM32F2XX ADC
*
* Copyright (c) 2014 Alistair Francis <alistair@alistair23.me>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/

#include "qemu/osdep.h"
#include "hw/sysbus.h"
#include "hw/hw.h"
#include "qapi/error.h"
#include "qemu/log.h"
#include "hw/adc/stm32f2xx_adc.h"

#ifndef STM_ADC_ERR_DEBUG
#define STM_ADC_ERR_DEBUG 0
#endif

#define DB_PRINT_L(lvl, fmt, args...) do { \
if (STM_ADC_ERR_DEBUG >= lvl) { \
qemu_log("%s: " fmt, __func__, ## args); \
} \
} while (0);

#define DB_PRINT(fmt, args...) DB_PRINT_L(1, fmt, ## args)

static void stm32f2xx_adc_reset(DeviceState *dev)
{
STM32F2XXADCState *s = STM32F2XX_ADC(dev);

s->adc_sr = 0x00000000;
s->adc_cr1 = 0x00000000;
s->adc_cr2 = 0x00000000;
s->adc_smpr1 = 0x00000000;
s->adc_smpr2 = 0x00000000;
s->adc_jofr[0] = 0x00000000;
s->adc_jofr[1] = 0x00000000;
s->adc_jofr[2] = 0x00000000;
s->adc_jofr[3] = 0x00000000;
s->adc_htr = 0x00000FFF;
s->adc_ltr = 0x00000000;
s->adc_sqr1 = 0x00000000;
s->adc_sqr2 = 0x00000000;
s->adc_sqr3 = 0x00000000;
s->adc_jsqr = 0x00000000;
s->adc_jdr[0] = 0x00000000;
s->adc_jdr[1] = 0x00000000;
s->adc_jdr[2] = 0x00000000;
s->adc_jdr[3] = 0x00000000;
s->adc_dr = 0x00000000;
}

static uint32_t stm32f2xx_adc_generate_value(STM32F2XXADCState *s)
{
/* Attempts to fake some ADC values */
s->adc_dr = s->adc_dr + 7;

switch ((s->adc_cr1 & ADC_CR1_RES) >> 24) {
case 0:
/* 12-bit */
s->adc_dr &= 0xFFF;
break;
case 1:
/* 10-bit */
s->adc_dr &= 0x3FF;
break;
case 2:
/* 8-bit */
s->adc_dr &= 0xFF;
break;
default:
/* 6-bit */
s->adc_dr &= 0x3F;
}

if (s->adc_cr2 & ADC_CR2_ALIGN) {
return (s->adc_dr << 1) & 0xFFF0;
} else {
return s->adc_dr;
}
}

static uint64_t stm32f2xx_adc_read(void *opaque, hwaddr addr,
unsigned int size)
{
STM32F2XXADCState *s = opaque;

DB_PRINT("Address: 0x%" HWADDR_PRIx "\n", addr);

if (addr >= ADC_COMMON_ADDRESS) {
qemu_log_mask(LOG_UNIMP,
"%s: ADC Common Register Unsupported\n", __func__);
}

switch (addr) {
case ADC_SR:
return s->adc_sr;
case ADC_CR1:
return s->adc_cr1;
case ADC_CR2:
return s->adc_cr2 & 0xFFFFFFF;
case ADC_SMPR1:
return s->adc_smpr1;
case ADC_SMPR2:
return s->adc_smpr2;
case ADC_JOFR1:
case ADC_JOFR2:
case ADC_JOFR3:
case ADC_JOFR4:
qemu_log_mask(LOG_UNIMP, "%s: " \
"Injection ADC is not implemented, the registers are " \
"included for compatibility\n", __func__);
return s->adc_jofr[(addr - ADC_JOFR1) / 4];
case ADC_HTR:
return s->adc_htr;
case ADC_LTR:
return s->adc_ltr;
case ADC_SQR1:
return s->adc_sqr1;
case ADC_SQR2:
return s->adc_sqr2;
case ADC_SQR3:
return s->adc_sqr3;
case ADC_JSQR:
qemu_log_mask(LOG_UNIMP, "%s: " \
"Injection ADC is not implemented, the registers are " \
"included for compatibility\n", __func__);
return s->adc_jsqr;
case ADC_JDR1:
case ADC_JDR2:
case ADC_JDR3:
case ADC_JDR4:
qemu_log_mask(LOG_UNIMP, "%s: " \
"Injection ADC is not implemented, the registers are " \
"included for compatibility\n", __func__);
return s->adc_jdr[(addr - ADC_JDR1) / 4] -
s->adc_jofr[(addr - ADC_JDR1) / 4];
case ADC_DR:
if ((s->adc_cr2 & ADC_CR2_ADON) && (s->adc_cr2 & ADC_CR2_SWSTART)) {
s->adc_cr2 ^= ADC_CR2_SWSTART;
return stm32f2xx_adc_generate_value(s);
} else {
return 0;
}
default:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, addr);
}

return 0;
}

static void stm32f2xx_adc_write(void *opaque, hwaddr addr,
uint64_t val64, unsigned int size)
{
STM32F2XXADCState *s = opaque;
uint32_t value = (uint32_t) val64;

DB_PRINT("Address: 0x%" HWADDR_PRIx ", Value: 0x%x\n",
addr, value);

if (addr >= 0x100) {
qemu_log_mask(LOG_UNIMP,
"%s: ADC Common Register Unsupported\n", __func__);
}

switch (addr) {
case ADC_SR:
s->adc_sr &= (value & 0x3F);
break;
case ADC_CR1:
s->adc_cr1 = value;
break;
case ADC_CR2:
s->adc_cr2 = value;
break;
case ADC_SMPR1:
s->adc_smpr1 = value;
break;
case ADC_SMPR2:
s->adc_smpr2 = value;
break;
case ADC_JOFR1:
case ADC_JOFR2:
case ADC_JOFR3:
case ADC_JOFR4:
s->adc_jofr[(addr - ADC_JOFR1) / 4] = (value & 0xFFF);
qemu_log_mask(LOG_UNIMP, "%s: " \
"Injection ADC is not implemented, the registers are " \
"included for compatibility\n", __func__);
break;
case ADC_HTR:
s->adc_htr = value;
break;
case ADC_LTR:
s->adc_ltr = value;
break;
case ADC_SQR1:
s->adc_sqr1 = value;
break;
case ADC_SQR2:
s->adc_sqr2 = value;
break;
case ADC_SQR3:
s->adc_sqr3 = value;
break;
case ADC_JSQR:
s->adc_jsqr = value;
qemu_log_mask(LOG_UNIMP, "%s: " \
"Injection ADC is not implemented, the registers are " \
"included for compatibility\n", __func__);
break;
case ADC_JDR1:
case ADC_JDR2:
case ADC_JDR3:
case ADC_JDR4:
s->adc_jdr[(addr - ADC_JDR1) / 4] = value;
qemu_log_mask(LOG_UNIMP, "%s: " \
"Injection ADC is not implemented, the registers are " \
"included for compatibility\n", __func__);
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, addr);
}
}

static const MemoryRegionOps stm32f2xx_adc_ops = {
.read = stm32f2xx_adc_read,
.write = stm32f2xx_adc_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};

static const VMStateDescription vmstate_stm32f2xx_adc = {
.name = TYPE_STM32F2XX_ADC,
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(adc_sr, STM32F2XXADCState),
VMSTATE_UINT32(adc_cr1, STM32F2XXADCState),
VMSTATE_UINT32(adc_cr2, STM32F2XXADCState),
VMSTATE_UINT32(adc_smpr1, STM32F2XXADCState),
VMSTATE_UINT32(adc_smpr2, STM32F2XXADCState),
VMSTATE_UINT32_ARRAY(adc_jofr, STM32F2XXADCState, 4),
VMSTATE_UINT32(adc_htr, STM32F2XXADCState),
VMSTATE_UINT32(adc_ltr, STM32F2XXADCState),
VMSTATE_UINT32(adc_sqr1, STM32F2XXADCState),
VMSTATE_UINT32(adc_sqr2, STM32F2XXADCState),
VMSTATE_UINT32(adc_sqr3, STM32F2XXADCState),
VMSTATE_UINT32(adc_jsqr, STM32F2XXADCState),
VMSTATE_UINT32_ARRAY(adc_jdr, STM32F2XXADCState, 4),
VMSTATE_UINT32(adc_dr, STM32F2XXADCState),
VMSTATE_END_OF_LIST()
}
};

static void stm32f2xx_adc_init(Object *obj)
{
STM32F2XXADCState *s = STM32F2XX_ADC(obj);

sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);

memory_region_init_io(&s->mmio, obj, &stm32f2xx_adc_ops, s,
TYPE_STM32F2XX_ADC, 0xFF);
sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
}

static void stm32f2xx_adc_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);

dc->reset = stm32f2xx_adc_reset;
dc->vmsd = &vmstate_stm32f2xx_adc;
}

static const TypeInfo stm32f2xx_adc_info = {
.name = TYPE_STM32F2XX_ADC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(STM32F2XXADCState),
.instance_init = stm32f2xx_adc_init,
.class_init = stm32f2xx_adc_class_init,
};

static void stm32f2xx_adc_register_types(void)
{
type_register_static(&stm32f2xx_adc_info);
}

type_init(stm32f2xx_adc_register_types)

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