hw/misc/stm32l4x5_syscfg.c - qemu - Git at Google

 /*
  * STM32L4x5 SYSCFG (System Configuration Controller)
  *
  * Copyright (c) 2023 Arnaud Minier <arnaud.minier@telecom-paris.fr>
  * Copyright (c) 2023 Inès Varhol <ines.varhol@telecom-paris.fr>
  *
  * SPDX-License-Identifier: GPL-2.0-or-later
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
  *
  * This work is based on the stm32f4xx_syscfg by Alistair Francis.
  * Original code is licensed under the MIT License:
  *
  * Copyright (c) 2014 Alistair Francis <alistair@alistair23.me>
  */

 /*
  * The reference used is the STMicroElectronics RM0351 Reference manual
  * for STM32L4x5 and STM32L4x6 advanced Arm ® -based 32-bit MCUs.
  * https://www.st.com/en/microcontrollers-microprocessors/stm32l4x5/documentation.html
  */

 #include "qemu/osdep.h"
 #include "qemu/log.h"
 #include "trace.h"
 #include "hw/irq.h"
 #include "migration/vmstate.h"
 #include "hw/misc/stm32l4x5_syscfg.h"

 #define SYSCFG_MEMRMP 0x00
 #define SYSCFG_CFGR1 0x04
 #define SYSCFG_EXTICR1 0x08
 #define SYSCFG_EXTICR2 0x0C
 #define SYSCFG_EXTICR3 0x10
 #define SYSCFG_EXTICR4 0x14
 #define SYSCFG_SCSR 0x18
 #define SYSCFG_CFGR2 0x1C
 #define SYSCFG_SWPR 0x20
 #define SYSCFG_SKR 0x24
 #define SYSCFG_SWPR2 0x28

 /* 00000000_00000000_00000001_00000111 */
 #define ACTIVABLE_BITS_MEMRP 0x00000107

 /* 11111100_11111111_00000001_00000000 */
 #define ACTIVABLE_BITS_CFGR1 0xFCFF0100
 /* 00000000_00000000_00000000_00000001 */
 #define FIREWALL_DISABLE_CFGR1 0x00000001

 /* 00000000_00000000_11111111_11111111 */
 #define ACTIVABLE_BITS_EXTICR 0x0000FFFF

 /* 00000000_00000000_00000000_00000011 */
 /* #define ACTIVABLE_BITS_SCSR 0x00000003 */

 /* 00000000_00000000_00000000_00001111 */
 #define ECC_LOCK_CFGR2 0x0000000F
 /* 00000000_00000000_00000001_00000000 */
 #define SRAM2_PARITY_ERROR_FLAG_CFGR2 0x00000100

 /* 00000000_00000000_00000000_11111111 */
 #define ACTIVABLE_BITS_SKR 0x000000FF

 #define NUM_LINES_PER_EXTICR_REG 4

 static void stm32l4x5_syscfg_hold_reset(Object *obj)
 {
     Stm32l4x5SyscfgState *s = STM32L4X5_SYSCFG(obj);

     s->memrmp = 0x00000000;
     s->cfgr1 = 0x7C000001;
     s->exticr[0] = 0x00000000;
     s->exticr[1] = 0x00000000;
     s->exticr[2] = 0x00000000;
     s->exticr[3] = 0x00000000;
     s->scsr = 0x00000000;
     s->cfgr2 = 0x00000000;
     s->swpr = 0x00000000;
     s->skr = 0x00000000;
     s->swpr2 = 0x00000000;
 }

 static void stm32l4x5_syscfg_set_irq(void *opaque, int irq, int level)
 {
     Stm32l4x5SyscfgState *s = opaque;
     const uint8_t gpio = irq / GPIO_NUM_PINS;
     const int line = irq % GPIO_NUM_PINS;

     const int exticr_reg = line / NUM_LINES_PER_EXTICR_REG;
     const int startbit = (line % NUM_LINES_PER_EXTICR_REG) * 4;

     g_assert(gpio < NUM_GPIOS);
     trace_stm32l4x5_syscfg_set_irq(gpio, line, level);

     if (extract32(s->exticr[exticr_reg], startbit, 4) == gpio) {
         trace_stm32l4x5_syscfg_forward_exti(line);
         qemu_set_irq(s->gpio_out[line], level);
     }
 }

 static uint64_t stm32l4x5_syscfg_read(void *opaque, hwaddr addr,
                                       unsigned int size)
 {
     Stm32l4x5SyscfgState *s = opaque;

     trace_stm32l4x5_syscfg_read(addr);

     switch (addr) {
     case SYSCFG_MEMRMP:
         return s->memrmp;
     case SYSCFG_CFGR1:
         return s->cfgr1;
     case SYSCFG_EXTICR1...SYSCFG_EXTICR4:
         return s->exticr[(addr - SYSCFG_EXTICR1) / 4];
     case SYSCFG_SCSR:
         return s->scsr;
     case SYSCFG_CFGR2:
         return s->cfgr2;
     case SYSCFG_SWPR:
         return s->swpr;
     case SYSCFG_SKR:
         return s->skr;
     case SYSCFG_SWPR2:
         return s->swpr2;
     default:
         qemu_log_mask(LOG_GUEST_ERROR,
                       "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, addr);
         return 0;
     }
 }
 static void stm32l4x5_syscfg_write(void *opaque, hwaddr addr,
                                    uint64_t value, unsigned int size)
 {
     Stm32l4x5SyscfgState *s = opaque;

     trace_stm32l4x5_syscfg_write(addr, value);

     switch (addr) {
     case SYSCFG_MEMRMP:
         qemu_log_mask(LOG_UNIMP,
                       "%s: Changing the memory mapping isn't supported\n",
                       __func__);
         s->memrmp = value & ACTIVABLE_BITS_MEMRP;
         return;
     case SYSCFG_CFGR1:
         qemu_log_mask(LOG_UNIMP,
                       "%s: Functions in CFGRx aren't supported\n",
                       __func__);
         /* bit 0 (firewall dis.) is cleared by software, set only by reset. */
         s->cfgr1 = (s->cfgr1 & value & FIREWALL_DISABLE_CFGR1) |
                    (value & ACTIVABLE_BITS_CFGR1);
         return;
     case SYSCFG_EXTICR1...SYSCFG_EXTICR4:
         s->exticr[(addr - SYSCFG_EXTICR1) / 4] =
                 (value & ACTIVABLE_BITS_EXTICR);
         return;
     case SYSCFG_SCSR:
         qemu_log_mask(LOG_UNIMP,
                       "%s: Erasing SRAM2 isn't supported\n",
                       __func__);
         /*
          * only non reserved bits are :
          * bit 0 (write-protected by a passkey), bit 1 (meant to be read)
          * so it serves no purpose yet to add :
          * s->scsr = value & 0x3;
          */
         return;
     case SYSCFG_CFGR2:
         qemu_log_mask(LOG_UNIMP,
                       "%s: Functions in CFGRx aren't supported\n",
                       __func__);
         /* bit 8 (SRAM2 PEF) is cleared by software by writing a '1'.*/
         /* bits[3:0] (ECC Lock) are set by software, cleared only by reset.*/
         s->cfgr2 = (s->cfgr2 | (value & ECC_LOCK_CFGR2)) &
                    ~(value & SRAM2_PARITY_ERROR_FLAG_CFGR2);
         return;
     case SYSCFG_SWPR:
         qemu_log_mask(LOG_UNIMP,
                       "%s: Write protecting SRAM2 isn't supported\n",
                       __func__);
         /* These bits are set by software and cleared only by reset.*/
         s->swpr |= value;
         return;
     case SYSCFG_SKR:
         qemu_log_mask(LOG_UNIMP,
                       "%s: Erasing SRAM2 isn't supported\n",
                       __func__);
         s->skr = value & ACTIVABLE_BITS_SKR;
         return;
     case SYSCFG_SWPR2:
         qemu_log_mask(LOG_UNIMP,
                       "%s: Write protecting SRAM2 isn't supported\n",
                       __func__);
         /* These bits are set by software and cleared only by reset.*/
         s->swpr2 |= value;
         return;
     default:
         qemu_log_mask(LOG_GUEST_ERROR,
                       "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, addr);
     }
 }

 static const MemoryRegionOps stm32l4x5_syscfg_ops = {
     .read = stm32l4x5_syscfg_read,
     .write = stm32l4x5_syscfg_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
     .impl.min_access_size = 4,
     .impl.max_access_size = 4,
     .impl.unaligned = false,
     .valid.min_access_size = 4,
     .valid.max_access_size = 4,
     .valid.unaligned = false,
 };

 static void stm32l4x5_syscfg_init(Object *obj)
 {
     Stm32l4x5SyscfgState *s = STM32L4X5_SYSCFG(obj);

     memory_region_init_io(&s->mmio, obj, &stm32l4x5_syscfg_ops, s,
                           TYPE_STM32L4X5_SYSCFG, 0x400);
     sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);

     qdev_init_gpio_in(DEVICE(obj), stm32l4x5_syscfg_set_irq,
                       GPIO_NUM_PINS * NUM_GPIOS);
     qdev_init_gpio_out(DEVICE(obj), s->gpio_out, GPIO_NUM_PINS);
 }

 static const VMStateDescription vmstate_stm32l4x5_syscfg = {
     .name = TYPE_STM32L4X5_SYSCFG,
     .version_id = 1,
     .minimum_version_id = 1,
     .fields = (VMStateField[]) {
         VMSTATE_UINT32(memrmp, Stm32l4x5SyscfgState),
         VMSTATE_UINT32(cfgr1, Stm32l4x5SyscfgState),
         VMSTATE_UINT32_ARRAY(exticr, Stm32l4x5SyscfgState,
                              SYSCFG_NUM_EXTICR),
         VMSTATE_UINT32(scsr, Stm32l4x5SyscfgState),
         VMSTATE_UINT32(cfgr2, Stm32l4x5SyscfgState),
         VMSTATE_UINT32(swpr, Stm32l4x5SyscfgState),
         VMSTATE_UINT32(skr, Stm32l4x5SyscfgState),
         VMSTATE_UINT32(swpr2, Stm32l4x5SyscfgState),
         VMSTATE_END_OF_LIST()
     }
 };

 static void stm32l4x5_syscfg_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     ResettableClass *rc = RESETTABLE_CLASS(klass);

     dc->vmsd = &vmstate_stm32l4x5_syscfg;
     rc->phases.hold = stm32l4x5_syscfg_hold_reset;
 }

 static const TypeInfo stm32l4x5_syscfg_info[] = {
     {
         .name          = TYPE_STM32L4X5_SYSCFG,
         .parent        = TYPE_SYS_BUS_DEVICE,
         .instance_size = sizeof(Stm32l4x5SyscfgState),
         .instance_init = stm32l4x5_syscfg_init,
         .class_init    = stm32l4x5_syscfg_class_init,
     }
 };

 DEFINE_TYPES(stm32l4x5_syscfg_info)
	/*
	* STM32L4x5 SYSCFG (System Configuration Controller)
	*
	* Copyright (c) 2023 Arnaud Minier <arnaud.minier@telecom-paris.fr>
	* Copyright (c) 2023 Inès Varhol <ines.varhol@telecom-paris.fr>
	*
	* SPDX-License-Identifier: GPL-2.0-or-later
	*
	* This work is licensed under the terms of the GNU GPL, version 2 or later.
	* See the COPYING file in the top-level directory.
	*
	* This work is based on the stm32f4xx_syscfg by Alistair Francis.
	* Original code is licensed under the MIT License:
	*
	* Copyright (c) 2014 Alistair Francis <alistair@alistair23.me>
	*/

	/*
	* The reference used is the STMicroElectronics RM0351 Reference manual
	* for STM32L4x5 and STM32L4x6 advanced Arm ® -based 32-bit MCUs.
	* https://www.st.com/en/microcontrollers-microprocessors/stm32l4x5/documentation.html
	*/

	#include "qemu/osdep.h"
	#include "qemu/log.h"
	#include "trace.h"
	#include "hw/irq.h"
	#include "migration/vmstate.h"
	#include "hw/misc/stm32l4x5_syscfg.h"

	#define SYSCFG_MEMRMP 0x00
	#define SYSCFG_CFGR1 0x04
	#define SYSCFG_EXTICR1 0x08
	#define SYSCFG_EXTICR2 0x0C
	#define SYSCFG_EXTICR3 0x10
	#define SYSCFG_EXTICR4 0x14
	#define SYSCFG_SCSR 0x18
	#define SYSCFG_CFGR2 0x1C
	#define SYSCFG_SWPR 0x20
	#define SYSCFG_SKR 0x24
	#define SYSCFG_SWPR2 0x28

	/* 00000000_00000000_00000001_00000111 */
	#define ACTIVABLE_BITS_MEMRP 0x00000107

	/* 11111100_11111111_00000001_00000000 */
	#define ACTIVABLE_BITS_CFGR1 0xFCFF0100
	/* 00000000_00000000_00000000_00000001 */
	#define FIREWALL_DISABLE_CFGR1 0x00000001

	/* 00000000_00000000_11111111_11111111 */
	#define ACTIVABLE_BITS_EXTICR 0x0000FFFF

	/* 00000000_00000000_00000000_00000011 */
	/* #define ACTIVABLE_BITS_SCSR 0x00000003 */

	/* 00000000_00000000_00000000_00001111 */
	#define ECC_LOCK_CFGR2 0x0000000F
	/* 00000000_00000000_00000001_00000000 */
	#define SRAM2_PARITY_ERROR_FLAG_CFGR2 0x00000100

	/* 00000000_00000000_00000000_11111111 */
	#define ACTIVABLE_BITS_SKR 0x000000FF

	#define NUM_LINES_PER_EXTICR_REG 4

	static void stm32l4x5_syscfg_hold_reset(Object *obj)
	{
	Stm32l4x5SyscfgState *s = STM32L4X5_SYSCFG(obj);

	s->memrmp = 0x00000000;
	s->cfgr1 = 0x7C000001;
	s->exticr[0] = 0x00000000;
	s->exticr[1] = 0x00000000;
	s->exticr[2] = 0x00000000;
	s->exticr[3] = 0x00000000;
	s->scsr = 0x00000000;
	s->cfgr2 = 0x00000000;
	s->swpr = 0x00000000;
	s->skr = 0x00000000;
	s->swpr2 = 0x00000000;
	}

	static void stm32l4x5_syscfg_set_irq(void *opaque, int irq, int level)
	{
	Stm32l4x5SyscfgState *s = opaque;
	const uint8_t gpio = irq / GPIO_NUM_PINS;
	const int line = irq % GPIO_NUM_PINS;

	const int exticr_reg = line / NUM_LINES_PER_EXTICR_REG;
	const int startbit = (line % NUM_LINES_PER_EXTICR_REG) * 4;

	g_assert(gpio < NUM_GPIOS);
	trace_stm32l4x5_syscfg_set_irq(gpio, line, level);

	if (extract32(s->exticr[exticr_reg], startbit, 4) == gpio) {
	trace_stm32l4x5_syscfg_forward_exti(line);
	qemu_set_irq(s->gpio_out[line], level);
	}
	}

	static uint64_t stm32l4x5_syscfg_read(void *opaque, hwaddr addr,
	unsigned int size)
	{
	Stm32l4x5SyscfgState *s = opaque;

	trace_stm32l4x5_syscfg_read(addr);

	switch (addr) {
	case SYSCFG_MEMRMP:
	return s->memrmp;
	case SYSCFG_CFGR1:
	return s->cfgr1;
	case SYSCFG_EXTICR1...SYSCFG_EXTICR4:
	return s->exticr[(addr - SYSCFG_EXTICR1) / 4];
	case SYSCFG_SCSR:
	return s->scsr;
	case SYSCFG_CFGR2:
	return s->cfgr2;
	case SYSCFG_SWPR:
	return s->swpr;
	case SYSCFG_SKR:
	return s->skr;
	case SYSCFG_SWPR2:
	return s->swpr2;
	default:
	qemu_log_mask(LOG_GUEST_ERROR,
	"%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, addr);
	return 0;
	}
	}
	static void stm32l4x5_syscfg_write(void *opaque, hwaddr addr,
	uint64_t value, unsigned int size)
	{
	Stm32l4x5SyscfgState *s = opaque;

	trace_stm32l4x5_syscfg_write(addr, value);

	switch (addr) {
	case SYSCFG_MEMRMP:
	qemu_log_mask(LOG_UNIMP,
	"%s: Changing the memory mapping isn't supported\n",
	__func__);
	s->memrmp = value & ACTIVABLE_BITS_MEMRP;
	return;
	case SYSCFG_CFGR1:
	qemu_log_mask(LOG_UNIMP,
	"%s: Functions in CFGRx aren't supported\n",
	__func__);
	/* bit 0 (firewall dis.) is cleared by software, set only by reset. */
	s->cfgr1 = (s->cfgr1 & value & FIREWALL_DISABLE_CFGR1) \|
	(value & ACTIVABLE_BITS_CFGR1);
	return;
	case SYSCFG_EXTICR1...SYSCFG_EXTICR4:
	s->exticr[(addr - SYSCFG_EXTICR1) / 4] =
	(value & ACTIVABLE_BITS_EXTICR);
	return;
	case SYSCFG_SCSR:
	qemu_log_mask(LOG_UNIMP,
	"%s: Erasing SRAM2 isn't supported\n",
	__func__);
	/*
	* only non reserved bits are :
	* bit 0 (write-protected by a passkey), bit 1 (meant to be read)
	* so it serves no purpose yet to add :
	* s->scsr = value & 0x3;
	*/
	return;
	case SYSCFG_CFGR2:
	qemu_log_mask(LOG_UNIMP,
	"%s: Functions in CFGRx aren't supported\n",
	__func__);
	/* bit 8 (SRAM2 PEF) is cleared by software by writing a '1'.*/
	/* bits[3:0] (ECC Lock) are set by software, cleared only by reset.*/
	s->cfgr2 = (s->cfgr2 \| (value & ECC_LOCK_CFGR2)) &
	~(value & SRAM2_PARITY_ERROR_FLAG_CFGR2);
	return;
	case SYSCFG_SWPR:
	qemu_log_mask(LOG_UNIMP,
	"%s: Write protecting SRAM2 isn't supported\n",
	__func__);
	/* These bits are set by software and cleared only by reset.*/
	s->swpr \|= value;
	return;
	case SYSCFG_SKR:
	qemu_log_mask(LOG_UNIMP,
	"%s: Erasing SRAM2 isn't supported\n",
	__func__);
	s->skr = value & ACTIVABLE_BITS_SKR;
	return;
	case SYSCFG_SWPR2:
	qemu_log_mask(LOG_UNIMP,
	"%s: Write protecting SRAM2 isn't supported\n",
	__func__);
	/* These bits are set by software and cleared only by reset.*/
	s->swpr2 \|= value;
	return;
	default:
	qemu_log_mask(LOG_GUEST_ERROR,
	"%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, addr);
	}
	}

	static const MemoryRegionOps stm32l4x5_syscfg_ops = {
	.read = stm32l4x5_syscfg_read,
	.write = stm32l4x5_syscfg_write,
	.endianness = DEVICE_NATIVE_ENDIAN,
	.impl.min_access_size = 4,
	.impl.max_access_size = 4,
	.impl.unaligned = false,
	.valid.min_access_size = 4,
	.valid.max_access_size = 4,
	.valid.unaligned = false,
	};

	static void stm32l4x5_syscfg_init(Object *obj)
	{
	Stm32l4x5SyscfgState *s = STM32L4X5_SYSCFG(obj);

	memory_region_init_io(&s->mmio, obj, &stm32l4x5_syscfg_ops, s,
	TYPE_STM32L4X5_SYSCFG, 0x400);
	sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);

	qdev_init_gpio_in(DEVICE(obj), stm32l4x5_syscfg_set_irq,
	GPIO_NUM_PINS * NUM_GPIOS);
	qdev_init_gpio_out(DEVICE(obj), s->gpio_out, GPIO_NUM_PINS);
	}

	static const VMStateDescription vmstate_stm32l4x5_syscfg = {
	.name = TYPE_STM32L4X5_SYSCFG,
	.version_id = 1,
	.minimum_version_id = 1,
	.fields = (VMStateField[]) {
	VMSTATE_UINT32(memrmp, Stm32l4x5SyscfgState),
	VMSTATE_UINT32(cfgr1, Stm32l4x5SyscfgState),
	VMSTATE_UINT32_ARRAY(exticr, Stm32l4x5SyscfgState,
	SYSCFG_NUM_EXTICR),
	VMSTATE_UINT32(scsr, Stm32l4x5SyscfgState),
	VMSTATE_UINT32(cfgr2, Stm32l4x5SyscfgState),
	VMSTATE_UINT32(swpr, Stm32l4x5SyscfgState),
	VMSTATE_UINT32(skr, Stm32l4x5SyscfgState),
	VMSTATE_UINT32(swpr2, Stm32l4x5SyscfgState),
	VMSTATE_END_OF_LIST()
	}
	};

	static void stm32l4x5_syscfg_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);
	ResettableClass *rc = RESETTABLE_CLASS(klass);

	dc->vmsd = &vmstate_stm32l4x5_syscfg;
	rc->phases.hold = stm32l4x5_syscfg_hold_reset;
	}

	static const TypeInfo stm32l4x5_syscfg_info[] = {
	{
	.name = TYPE_STM32L4X5_SYSCFG,
	.parent = TYPE_SYS_BUS_DEVICE,
	.instance_size = sizeof(Stm32l4x5SyscfgState),
	.instance_init = stm32l4x5_syscfg_init,
	.class_init = stm32l4x5_syscfg_class_init,
	}
	};

	DEFINE_TYPES(stm32l4x5_syscfg_info)