1 /* 2 * STM32L4x5 SYSCFG (System Configuration Controller) 3 * 4 * Copyright (c) 2023 Arnaud Minier <arnaud.minier@telecom-paris.fr> 5 * Copyright (c) 2023 Inès Varhol <ines.varhol@telecom-paris.fr> 6 * 7 * SPDX-License-Identifier: GPL-2.0-or-later 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 or later. 10 * See the COPYING file in the top-level directory. 11 * 12 * This work is based on the stm32f4xx_syscfg by Alistair Francis. 13 * Original code is licensed under the MIT License: 14 * 15 * Copyright (c) 2014 Alistair Francis <alistair@alistair23.me> 16 */ 17 18 /* 19 * The reference used is the STMicroElectronics RM0351 Reference manual 20 * for STM32L4x5 and STM32L4x6 advanced Arm ® -based 32-bit MCUs. 21 * https://www.st.com/en/microcontrollers-microprocessors/stm32l4x5/documentation.html 22 */ 23 24 #include "qemu/osdep.h" 25 #include "qemu/log.h" 26 #include "trace.h" 27 #include "hw/irq.h" 28 #include "migration/vmstate.h" 29 #include "hw/misc/stm32l4x5_syscfg.h" 30 #include "hw/gpio/stm32l4x5_gpio.h" 31 32 #define SYSCFG_MEMRMP 0x00 33 #define SYSCFG_CFGR1 0x04 34 #define SYSCFG_EXTICR1 0x08 35 #define SYSCFG_EXTICR2 0x0C 36 #define SYSCFG_EXTICR3 0x10 37 #define SYSCFG_EXTICR4 0x14 38 #define SYSCFG_SCSR 0x18 39 #define SYSCFG_CFGR2 0x1C 40 #define SYSCFG_SWPR 0x20 41 #define SYSCFG_SKR 0x24 42 #define SYSCFG_SWPR2 0x28 43 44 /* 00000000_00000000_00000001_00000111 */ 45 #define ACTIVABLE_BITS_MEMRP 0x00000107 46 47 /* 11111100_11111111_00000001_00000000 */ 48 #define ACTIVABLE_BITS_CFGR1 0xFCFF0100 49 /* 00000000_00000000_00000000_00000001 */ 50 #define FIREWALL_DISABLE_CFGR1 0x00000001 51 52 /* 00000000_00000000_11111111_11111111 */ 53 #define ACTIVABLE_BITS_EXTICR 0x0000FFFF 54 55 /* 00000000_00000000_00000000_00000011 */ 56 /* #define ACTIVABLE_BITS_SCSR 0x00000003 */ 57 58 /* 00000000_00000000_00000000_00001111 */ 59 #define ECC_LOCK_CFGR2 0x0000000F 60 /* 00000000_00000000_00000001_00000000 */ 61 #define SRAM2_PARITY_ERROR_FLAG_CFGR2 0x00000100 62 63 /* 00000000_00000000_00000000_11111111 */ 64 #define ACTIVABLE_BITS_SKR 0x000000FF 65 66 #define NUM_LINES_PER_EXTICR_REG 4 67 68 static void stm32l4x5_syscfg_hold_reset(Object *obj) 69 { 70 Stm32l4x5SyscfgState *s = STM32L4X5_SYSCFG(obj); 71 72 s->memrmp = 0x00000000; 73 s->cfgr1 = 0x7C000001; 74 s->exticr[0] = 0x00000000; 75 s->exticr[1] = 0x00000000; 76 s->exticr[2] = 0x00000000; 77 s->exticr[3] = 0x00000000; 78 s->scsr = 0x00000000; 79 s->cfgr2 = 0x00000000; 80 s->swpr = 0x00000000; 81 s->skr = 0x00000000; 82 s->swpr2 = 0x00000000; 83 } 84 85 static void stm32l4x5_syscfg_set_irq(void *opaque, int irq, int level) 86 { 87 Stm32l4x5SyscfgState *s = opaque; 88 const uint8_t gpio = irq / GPIO_NUM_PINS; 89 const int line = irq % GPIO_NUM_PINS; 90 91 const int exticr_reg = line / NUM_LINES_PER_EXTICR_REG; 92 const int startbit = (line % NUM_LINES_PER_EXTICR_REG) * 4; 93 94 g_assert(gpio < NUM_GPIOS); 95 trace_stm32l4x5_syscfg_set_irq(gpio, line, level); 96 97 if (extract32(s->exticr[exticr_reg], startbit, 4) == gpio) { 98 trace_stm32l4x5_syscfg_forward_exti(line); 99 qemu_set_irq(s->gpio_out[line], level); 100 } 101 } 102 103 static uint64_t stm32l4x5_syscfg_read(void *opaque, hwaddr addr, 104 unsigned int size) 105 { 106 Stm32l4x5SyscfgState *s = opaque; 107 108 trace_stm32l4x5_syscfg_read(addr); 109 110 switch (addr) { 111 case SYSCFG_MEMRMP: 112 return s->memrmp; 113 case SYSCFG_CFGR1: 114 return s->cfgr1; 115 case SYSCFG_EXTICR1...SYSCFG_EXTICR4: 116 return s->exticr[(addr - SYSCFG_EXTICR1) / 4]; 117 case SYSCFG_SCSR: 118 return s->scsr; 119 case SYSCFG_CFGR2: 120 return s->cfgr2; 121 case SYSCFG_SWPR: 122 return s->swpr; 123 case SYSCFG_SKR: 124 return s->skr; 125 case SYSCFG_SWPR2: 126 return s->swpr2; 127 default: 128 qemu_log_mask(LOG_GUEST_ERROR, 129 "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, addr); 130 return 0; 131 } 132 } 133 static void stm32l4x5_syscfg_write(void *opaque, hwaddr addr, 134 uint64_t value, unsigned int size) 135 { 136 Stm32l4x5SyscfgState *s = opaque; 137 138 trace_stm32l4x5_syscfg_write(addr, value); 139 140 switch (addr) { 141 case SYSCFG_MEMRMP: 142 qemu_log_mask(LOG_UNIMP, 143 "%s: Changing the memory mapping isn't supported\n", 144 __func__); 145 s->memrmp = value & ACTIVABLE_BITS_MEMRP; 146 return; 147 case SYSCFG_CFGR1: 148 qemu_log_mask(LOG_UNIMP, 149 "%s: Functions in CFGRx aren't supported\n", 150 __func__); 151 /* bit 0 (firewall dis.) is cleared by software, set only by reset. */ 152 s->cfgr1 = (s->cfgr1 & value & FIREWALL_DISABLE_CFGR1) | 153 (value & ACTIVABLE_BITS_CFGR1); 154 return; 155 case SYSCFG_EXTICR1...SYSCFG_EXTICR4: 156 s->exticr[(addr - SYSCFG_EXTICR1) / 4] = 157 (value & ACTIVABLE_BITS_EXTICR); 158 return; 159 case SYSCFG_SCSR: 160 qemu_log_mask(LOG_UNIMP, 161 "%s: Erasing SRAM2 isn't supported\n", 162 __func__); 163 /* 164 * only non reserved bits are : 165 * bit 0 (write-protected by a passkey), bit 1 (meant to be read) 166 * so it serves no purpose yet to add : 167 * s->scsr = value & 0x3; 168 */ 169 return; 170 case SYSCFG_CFGR2: 171 qemu_log_mask(LOG_UNIMP, 172 "%s: Functions in CFGRx aren't supported\n", 173 __func__); 174 /* bit 8 (SRAM2 PEF) is cleared by software by writing a '1'.*/ 175 /* bits[3:0] (ECC Lock) are set by software, cleared only by reset.*/ 176 s->cfgr2 = (s->cfgr2 | (value & ECC_LOCK_CFGR2)) & 177 ~(value & SRAM2_PARITY_ERROR_FLAG_CFGR2); 178 return; 179 case SYSCFG_SWPR: 180 qemu_log_mask(LOG_UNIMP, 181 "%s: Write protecting SRAM2 isn't supported\n", 182 __func__); 183 /* These bits are set by software and cleared only by reset.*/ 184 s->swpr |= value; 185 return; 186 case SYSCFG_SKR: 187 qemu_log_mask(LOG_UNIMP, 188 "%s: Erasing SRAM2 isn't supported\n", 189 __func__); 190 s->skr = value & ACTIVABLE_BITS_SKR; 191 return; 192 case SYSCFG_SWPR2: 193 qemu_log_mask(LOG_UNIMP, 194 "%s: Write protecting SRAM2 isn't supported\n", 195 __func__); 196 /* These bits are set by software and cleared only by reset.*/ 197 s->swpr2 |= value; 198 return; 199 default: 200 qemu_log_mask(LOG_GUEST_ERROR, 201 "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, addr); 202 } 203 } 204 205 static const MemoryRegionOps stm32l4x5_syscfg_ops = { 206 .read = stm32l4x5_syscfg_read, 207 .write = stm32l4x5_syscfg_write, 208 .endianness = DEVICE_NATIVE_ENDIAN, 209 .impl.min_access_size = 4, 210 .impl.max_access_size = 4, 211 .impl.unaligned = false, 212 .valid.min_access_size = 4, 213 .valid.max_access_size = 4, 214 .valid.unaligned = false, 215 }; 216 217 static void stm32l4x5_syscfg_init(Object *obj) 218 { 219 Stm32l4x5SyscfgState *s = STM32L4X5_SYSCFG(obj); 220 221 memory_region_init_io(&s->mmio, obj, &stm32l4x5_syscfg_ops, s, 222 TYPE_STM32L4X5_SYSCFG, 0x400); 223 sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio); 224 225 qdev_init_gpio_in(DEVICE(obj), stm32l4x5_syscfg_set_irq, 226 GPIO_NUM_PINS * NUM_GPIOS); 227 qdev_init_gpio_out(DEVICE(obj), s->gpio_out, GPIO_NUM_PINS); 228 } 229 230 static const VMStateDescription vmstate_stm32l4x5_syscfg = { 231 .name = TYPE_STM32L4X5_SYSCFG, 232 .version_id = 1, 233 .minimum_version_id = 1, 234 .fields = (VMStateField[]) { 235 VMSTATE_UINT32(memrmp, Stm32l4x5SyscfgState), 236 VMSTATE_UINT32(cfgr1, Stm32l4x5SyscfgState), 237 VMSTATE_UINT32_ARRAY(exticr, Stm32l4x5SyscfgState, 238 SYSCFG_NUM_EXTICR), 239 VMSTATE_UINT32(scsr, Stm32l4x5SyscfgState), 240 VMSTATE_UINT32(cfgr2, Stm32l4x5SyscfgState), 241 VMSTATE_UINT32(swpr, Stm32l4x5SyscfgState), 242 VMSTATE_UINT32(skr, Stm32l4x5SyscfgState), 243 VMSTATE_UINT32(swpr2, Stm32l4x5SyscfgState), 244 VMSTATE_END_OF_LIST() 245 } 246 }; 247 248 static void stm32l4x5_syscfg_class_init(ObjectClass *klass, void *data) 249 { 250 DeviceClass *dc = DEVICE_CLASS(klass); 251 ResettableClass *rc = RESETTABLE_CLASS(klass); 252 253 dc->vmsd = &vmstate_stm32l4x5_syscfg; 254 rc->phases.hold = stm32l4x5_syscfg_hold_reset; 255 } 256 257 static const TypeInfo stm32l4x5_syscfg_info[] = { 258 { 259 .name = TYPE_STM32L4X5_SYSCFG, 260 .parent = TYPE_SYS_BUS_DEVICE, 261 .instance_size = sizeof(Stm32l4x5SyscfgState), 262 .instance_init = stm32l4x5_syscfg_init, 263 .class_init = stm32l4x5_syscfg_class_init, 264 } 265 }; 266 267 DEFINE_TYPES(stm32l4x5_syscfg_info) 268