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 "hw/intc/sifive_plic.h" 24 #include "hw/intc/riscv_aclint.h" 25 #include "sysemu/sysemu.h" 26 #include "hw/qdev-properties.h" 27 #include "exec/address-spaces.h" 28 #include "hw/riscv/boot.h" 29 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 MemoryRegion *main_mem = g_new(MemoryRegion, 1); 49 50 /* Allow only Shakti C CPU for this platform */ 51 if (strcmp(mstate->cpu_type, TYPE_RISCV_CPU_SHAKTI_C) != 0) { 52 error_report("This board can only be used with Shakti C CPU"); 53 exit(1); 54 } 55 56 /* Initialize SoC */ 57 object_initialize_child(OBJECT(mstate), "soc", &sms->soc, 58 TYPE_RISCV_SHAKTI_SOC); 59 qdev_realize(DEVICE(&sms->soc), NULL, &error_abort); 60 61 /* register RAM */ 62 memory_region_init_ram(main_mem, NULL, "riscv.shakti.c.ram", 63 mstate->ram_size, &error_fatal); 64 memory_region_add_subregion(system_memory, 65 shakti_c_memmap[SHAKTI_C_RAM].base, 66 main_mem); 67 68 /* ROM reset vector */ 69 riscv_setup_rom_reset_vec(mstate, &sms->soc.cpus, 70 shakti_c_memmap[SHAKTI_C_RAM].base, 71 shakti_c_memmap[SHAKTI_C_ROM].base, 72 shakti_c_memmap[SHAKTI_C_ROM].size, 0, 0, 73 NULL); 74 if (mstate->firmware) { 75 riscv_load_firmware(mstate->firmware, 76 shakti_c_memmap[SHAKTI_C_RAM].base, 77 NULL); 78 } 79 } 80 81 static void shakti_c_machine_instance_init(Object *obj) 82 { 83 } 84 85 static void shakti_c_machine_class_init(ObjectClass *klass, void *data) 86 { 87 MachineClass *mc = MACHINE_CLASS(klass); 88 mc->desc = "RISC-V Board compatible with Shakti SDK"; 89 mc->init = shakti_c_machine_state_init; 90 mc->default_cpu_type = TYPE_RISCV_CPU_SHAKTI_C; 91 } 92 93 static const TypeInfo shakti_c_machine_type_info = { 94 .name = TYPE_RISCV_SHAKTI_MACHINE, 95 .parent = TYPE_MACHINE, 96 .class_init = shakti_c_machine_class_init, 97 .instance_init = shakti_c_machine_instance_init, 98 .instance_size = sizeof(ShaktiCMachineState), 99 }; 100 101 static void shakti_c_machine_type_info_register(void) 102 { 103 type_register_static(&shakti_c_machine_type_info); 104 } 105 type_init(shakti_c_machine_type_info_register) 106 107 static void shakti_c_soc_state_realize(DeviceState *dev, Error **errp) 108 { 109 MachineState *ms = MACHINE(qdev_get_machine()); 110 ShaktiCSoCState *sss = RISCV_SHAKTI_SOC(dev); 111 MemoryRegion *system_memory = get_system_memory(); 112 113 sysbus_realize(SYS_BUS_DEVICE(&sss->cpus), &error_abort); 114 115 sss->plic = sifive_plic_create(shakti_c_memmap[SHAKTI_C_PLIC].base, 116 (char *)SHAKTI_C_PLIC_HART_CONFIG, ms->smp.cpus, 0, 117 SHAKTI_C_PLIC_NUM_SOURCES, 118 SHAKTI_C_PLIC_NUM_PRIORITIES, 119 SHAKTI_C_PLIC_PRIORITY_BASE, 120 SHAKTI_C_PLIC_PENDING_BASE, 121 SHAKTI_C_PLIC_ENABLE_BASE, 122 SHAKTI_C_PLIC_ENABLE_STRIDE, 123 SHAKTI_C_PLIC_CONTEXT_BASE, 124 SHAKTI_C_PLIC_CONTEXT_STRIDE, 125 shakti_c_memmap[SHAKTI_C_PLIC].size); 126 127 riscv_aclint_swi_create(shakti_c_memmap[SHAKTI_C_CLINT].base, 128 0, 1, false); 129 riscv_aclint_mtimer_create(shakti_c_memmap[SHAKTI_C_CLINT].base + 130 RISCV_ACLINT_SWI_SIZE, 131 RISCV_ACLINT_DEFAULT_MTIMER_SIZE, 0, 1, 132 RISCV_ACLINT_DEFAULT_MTIMECMP, RISCV_ACLINT_DEFAULT_MTIME, 133 RISCV_ACLINT_DEFAULT_TIMEBASE_FREQ, false); 134 135 qdev_prop_set_chr(DEVICE(&(sss->uart)), "chardev", serial_hd(0)); 136 if (!sysbus_realize(SYS_BUS_DEVICE(&sss->uart), errp)) { 137 return; 138 } 139 sysbus_mmio_map(SYS_BUS_DEVICE(&sss->uart), 0, 140 shakti_c_memmap[SHAKTI_C_UART].base); 141 142 /* ROM */ 143 memory_region_init_rom(&sss->rom, OBJECT(dev), "riscv.shakti.c.rom", 144 shakti_c_memmap[SHAKTI_C_ROM].size, &error_fatal); 145 memory_region_add_subregion(system_memory, 146 shakti_c_memmap[SHAKTI_C_ROM].base, &sss->rom); 147 } 148 149 static void shakti_c_soc_class_init(ObjectClass *klass, void *data) 150 { 151 DeviceClass *dc = DEVICE_CLASS(klass); 152 dc->realize = shakti_c_soc_state_realize; 153 /* 154 * Reasons: 155 * - Creates CPUS in riscv_hart_realize(), and can create unintended 156 * CPUs 157 * - Uses serial_hds in realize function, thus can't be used twice 158 */ 159 dc->user_creatable = false; 160 } 161 162 static void shakti_c_soc_instance_init(Object *obj) 163 { 164 ShaktiCSoCState *sss = RISCV_SHAKTI_SOC(obj); 165 166 object_initialize_child(obj, "cpus", &sss->cpus, TYPE_RISCV_HART_ARRAY); 167 object_initialize_child(obj, "uart", &sss->uart, TYPE_SHAKTI_UART); 168 169 /* 170 * CPU type is fixed and we are not supporting passing from commandline yet. 171 * So let it be in instance_init. When supported should use ms->cpu_type 172 * instead of TYPE_RISCV_CPU_SHAKTI_C 173 */ 174 object_property_set_str(OBJECT(&sss->cpus), "cpu-type", 175 TYPE_RISCV_CPU_SHAKTI_C, &error_abort); 176 object_property_set_int(OBJECT(&sss->cpus), "num-harts", 1, 177 &error_abort); 178 } 179 180 static const TypeInfo shakti_c_type_info = { 181 .name = TYPE_RISCV_SHAKTI_SOC, 182 .parent = TYPE_DEVICE, 183 .class_init = shakti_c_soc_class_init, 184 .instance_init = shakti_c_soc_instance_init, 185 .instance_size = sizeof(ShaktiCSoCState), 186 }; 187 188 static void shakti_c_type_info_register(void) 189 { 190 type_register_static(&shakti_c_type_info); 191 } 192 type_init(shakti_c_type_info_register) 193