hw/adc/stm32f2xx_adc.c - qemu - Git at Google

 /*
  * 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 "migration/vmstate.h"
 #include "qemu/log.h"
 #include "qemu/module.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,
     .impl.min_access_size = 4,
     .impl.max_access_size = 4,
 };

 static const VMStateDescription vmstate_stm32f2xx_adc = {
     .name = TYPE_STM32F2XX_ADC,
     .version_id = 1,
     .minimum_version_id = 1,
     .fields = (const 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, 0x100);
     sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
 }

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

     device_class_set_legacy_reset(dc, 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)
	/*
	* 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 "migration/vmstate.h"
	#include "qemu/log.h"
	#include "qemu/module.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,
	.impl.min_access_size = 4,
	.impl.max_access_size = 4,
	};

	static const VMStateDescription vmstate_stm32f2xx_adc = {
	.name = TYPE_STM32F2XX_ADC,
	.version_id = 1,
	.minimum_version_id = 1,
	.fields = (const 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, 0x100);
	sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
	}

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

	device_class_set_legacy_reset(dc, 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)