1 /* 2 * Shakti C-class SoC emulation 3 * 4 * Copyright (c) 2021 Vijai Kumar K <vijai@behindbytes.com> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2 or later, as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 * 15 * You should have received a copy of the GNU General Public License along with 16 * this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #include "qemu/osdep.h" 20 #include "hw/boards.h" 21 #include "hw/riscv/shakti_c.h" 22 #include "qapi/error.h" 23 #include "qemu/error-report.h" 24 #include "hw/intc/sifive_plic.h" 25 #include "hw/intc/riscv_aclint.h" 26 #include "system/system.h" 27 #include "hw/qdev-properties.h" 28 #include "system/address-spaces.h" 29 #include "hw/riscv/boot.h" 30 31 static const struct MemmapEntry { 32 hwaddr base; 33 hwaddr size; 34 } shakti_c_memmap[] = { 35 [SHAKTI_C_ROM] = { 0x00001000, 0x2000 }, 36 [SHAKTI_C_RAM] = { 0x80000000, 0x0 }, 37 [SHAKTI_C_UART] = { 0x00011300, 0x00040 }, 38 [SHAKTI_C_GPIO] = { 0x020d0000, 0x00100 }, 39 [SHAKTI_C_PLIC] = { 0x0c000000, 0x20000 }, 40 [SHAKTI_C_CLINT] = { 0x02000000, 0xc0000 }, 41 [SHAKTI_C_I2C] = { 0x20c00000, 0x00100 }, 42 }; 43 44 static void shakti_c_machine_state_init(MachineState *mstate) 45 { 46 ShaktiCMachineState *sms = RISCV_SHAKTI_MACHINE(mstate); 47 MemoryRegion *system_memory = get_system_memory(); 48 hwaddr firmware_load_addr = shakti_c_memmap[SHAKTI_C_RAM].base; 49 50 /* Initialize SoC */ 51 object_initialize_child(OBJECT(mstate), "soc", &sms->soc, 52 TYPE_RISCV_SHAKTI_SOC); 53 qdev_realize(DEVICE(&sms->soc), NULL, &error_abort); 54 55 /* register RAM */ 56 memory_region_add_subregion(system_memory, 57 shakti_c_memmap[SHAKTI_C_RAM].base, 58 mstate->ram); 59 60 if (mstate->firmware) { 61 riscv_load_firmware(mstate->firmware, &firmware_load_addr, NULL); 62 } 63 64 /* ROM reset vector */ 65 riscv_setup_rom_reset_vec(mstate, &sms->soc.cpus, firmware_load_addr, 66 shakti_c_memmap[SHAKTI_C_ROM].base, 67 shakti_c_memmap[SHAKTI_C_ROM].size, 0, 0); 68 } 69 70 static void shakti_c_machine_instance_init(Object *obj) 71 { 72 } 73 74 static void shakti_c_machine_class_init(ObjectClass *klass, const void *data) 75 { 76 MachineClass *mc = MACHINE_CLASS(klass); 77 static const char * const valid_cpu_types[] = { 78 RISCV_CPU_TYPE_NAME("shakti-c"), 79 NULL 80 }; 81 82 mc->desc = "RISC-V Board compatible with Shakti SDK"; 83 mc->init = shakti_c_machine_state_init; 84 mc->default_cpu_type = TYPE_RISCV_CPU_SHAKTI_C; 85 mc->valid_cpu_types = valid_cpu_types; 86 mc->default_ram_id = "riscv.shakti.c.ram"; 87 } 88 89 static const TypeInfo shakti_c_machine_type_info = { 90 .name = TYPE_RISCV_SHAKTI_MACHINE, 91 .parent = TYPE_MACHINE, 92 .class_init = shakti_c_machine_class_init, 93 .instance_init = shakti_c_machine_instance_init, 94 .instance_size = sizeof(ShaktiCMachineState), 95 }; 96 97 static void shakti_c_machine_type_info_register(void) 98 { 99 type_register_static(&shakti_c_machine_type_info); 100 } 101 type_init(shakti_c_machine_type_info_register) 102 103 static void shakti_c_soc_state_realize(DeviceState *dev, Error **errp) 104 { 105 MachineState *ms = MACHINE(qdev_get_machine()); 106 ShaktiCSoCState *sss = RISCV_SHAKTI_SOC(dev); 107 MemoryRegion *system_memory = get_system_memory(); 108 109 sysbus_realize(SYS_BUS_DEVICE(&sss->cpus), &error_abort); 110 111 sss->plic = sifive_plic_create(shakti_c_memmap[SHAKTI_C_PLIC].base, 112 (char *)SHAKTI_C_PLIC_HART_CONFIG, ms->smp.cpus, 0, 113 SHAKTI_C_PLIC_NUM_SOURCES, 114 SHAKTI_C_PLIC_NUM_PRIORITIES, 115 SHAKTI_C_PLIC_PRIORITY_BASE, 116 SHAKTI_C_PLIC_PENDING_BASE, 117 SHAKTI_C_PLIC_ENABLE_BASE, 118 SHAKTI_C_PLIC_ENABLE_STRIDE, 119 SHAKTI_C_PLIC_CONTEXT_BASE, 120 SHAKTI_C_PLIC_CONTEXT_STRIDE, 121 shakti_c_memmap[SHAKTI_C_PLIC].size); 122 123 riscv_aclint_swi_create(shakti_c_memmap[SHAKTI_C_CLINT].base, 124 0, 1, false); 125 riscv_aclint_mtimer_create(shakti_c_memmap[SHAKTI_C_CLINT].base + 126 RISCV_ACLINT_SWI_SIZE, 127 RISCV_ACLINT_DEFAULT_MTIMER_SIZE, 0, 1, 128 RISCV_ACLINT_DEFAULT_MTIMECMP, RISCV_ACLINT_DEFAULT_MTIME, 129 RISCV_ACLINT_DEFAULT_TIMEBASE_FREQ, false); 130 131 qdev_prop_set_chr(DEVICE(&(sss->uart)), "chardev", serial_hd(0)); 132 if (!sysbus_realize(SYS_BUS_DEVICE(&sss->uart), errp)) { 133 return; 134 } 135 sysbus_mmio_map(SYS_BUS_DEVICE(&sss->uart), 0, 136 shakti_c_memmap[SHAKTI_C_UART].base); 137 138 /* ROM */ 139 memory_region_init_rom(&sss->rom, OBJECT(dev), "riscv.shakti.c.rom", 140 shakti_c_memmap[SHAKTI_C_ROM].size, &error_fatal); 141 memory_region_add_subregion(system_memory, 142 shakti_c_memmap[SHAKTI_C_ROM].base, &sss->rom); 143 } 144 145 static void shakti_c_soc_class_init(ObjectClass *klass, const void *data) 146 { 147 DeviceClass *dc = DEVICE_CLASS(klass); 148 dc->realize = shakti_c_soc_state_realize; 149 /* 150 * Reasons: 151 * - Creates CPUS in riscv_hart_realize(), and can create unintended 152 * CPUs 153 * - Uses serial_hds in realize function, thus can't be used twice 154 */ 155 dc->user_creatable = false; 156 } 157 158 static void shakti_c_soc_instance_init(Object *obj) 159 { 160 ShaktiCSoCState *sss = RISCV_SHAKTI_SOC(obj); 161 162 object_initialize_child(obj, "cpus", &sss->cpus, TYPE_RISCV_HART_ARRAY); 163 object_initialize_child(obj, "uart", &sss->uart, TYPE_SHAKTI_UART); 164 165 /* 166 * CPU type is fixed and we are not supporting passing from commandline yet. 167 * So let it be in instance_init. When supported should use ms->cpu_type 168 * instead of TYPE_RISCV_CPU_SHAKTI_C 169 */ 170 object_property_set_str(OBJECT(&sss->cpus), "cpu-type", 171 TYPE_RISCV_CPU_SHAKTI_C, &error_abort); 172 object_property_set_int(OBJECT(&sss->cpus), "num-harts", 1, 173 &error_abort); 174 } 175 176 static const TypeInfo shakti_c_type_info = { 177 .name = TYPE_RISCV_SHAKTI_SOC, 178 .parent = TYPE_DEVICE, 179 .class_init = shakti_c_soc_class_init, 180 .instance_init = shakti_c_soc_instance_init, 181 .instance_size = sizeof(ShaktiCSoCState), 182 }; 183 184 static void shakti_c_type_info_register(void) 185 { 186 type_register_static(&shakti_c_type_info); 187 } 188 type_init(shakti_c_type_info_register) 189