/* * STM32L4x5 SYSCFG (System Configuration Controller) * * Copyright (c) 2023 Arnaud Minier * Copyright (c) 2023 Inès Varhol * * 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 */ /* * 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/clock.h" #include "hw/qdev-clock.h" #include "qapi/error.h" #include "hw/misc/stm32l4x5_syscfg.h" #include "hw/gpio/stm32l4x5_gpio.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, ResetType type) { 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); s->clk = qdev_init_clock_in(DEVICE(s), "clk", NULL, s, 0); } static void stm32l4x5_syscfg_realize(DeviceState *dev, Error **errp) { Stm32l4x5SyscfgState *s = STM32L4X5_SYSCFG(dev); if (!clock_has_source(s->clk)) { error_setg(errp, "SYSCFG: clk input must be connected"); return; } } static const VMStateDescription vmstate_stm32l4x5_syscfg = { .name = TYPE_STM32L4X5_SYSCFG, .version_id = 2, .minimum_version_id = 2, .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_CLOCK(clk, 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; dc->realize = stm32l4x5_syscfg_realize; 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)