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shakti_c.c
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shakti_c.c
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/*
* Shakti C-class SoC emulation
*
* Copyright (c) 2021 Vijai Kumar K <vijai@behindbytes.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "hw/boards.h"
#include "hw/riscv/shakti_c.h"
#include "qapi/error.h"
#include "hw/intc/sifive_plic.h"
#include "hw/intc/riscv_aclint.h"
#include "sysemu/sysemu.h"
#include "hw/qdev-properties.h"
#include "exec/address-spaces.h"
#include "hw/riscv/boot.h"
static const struct MemmapEntry {
hwaddr base;
hwaddr size;
} shakti_c_memmap[] = {
[SHAKTI_C_ROM] = { 0x00001000, 0x2000 },
[SHAKTI_C_RAM] = { 0x80000000, 0x0 },
[SHAKTI_C_UART] = { 0x00011300, 0x00040 },
[SHAKTI_C_GPIO] = { 0x020d0000, 0x00100 },
[SHAKTI_C_PLIC] = { 0x0c000000, 0x20000 },
[SHAKTI_C_CLINT] = { 0x02000000, 0xc0000 },
[SHAKTI_C_I2C] = { 0x20c00000, 0x00100 },
};
static void shakti_c_machine_state_init(MachineState *mstate)
{
ShaktiCMachineState *sms = RISCV_SHAKTI_MACHINE(mstate);
MemoryRegion *system_memory = get_system_memory();
/* Allow only Shakti C CPU for this platform */
if (strcmp(mstate->cpu_type, TYPE_RISCV_CPU_SHAKTI_C) != 0) {
error_report("This board can only be used with Shakti C CPU");
exit(1);
}
/* Initialize SoC */
object_initialize_child(OBJECT(mstate), "soc", &sms->soc,
TYPE_RISCV_SHAKTI_SOC);
qdev_realize(DEVICE(&sms->soc), NULL, &error_abort);
/* register RAM */
memory_region_add_subregion(system_memory,
shakti_c_memmap[SHAKTI_C_RAM].base,
mstate->ram);
/* ROM reset vector */
riscv_setup_rom_reset_vec(mstate, &sms->soc.cpus,
shakti_c_memmap[SHAKTI_C_RAM].base,
shakti_c_memmap[SHAKTI_C_ROM].base,
shakti_c_memmap[SHAKTI_C_ROM].size, 0, 0);
if (mstate->firmware) {
riscv_load_firmware(mstate->firmware,
shakti_c_memmap[SHAKTI_C_RAM].base,
NULL);
}
}
static void shakti_c_machine_instance_init(Object *obj)
{
}
static void shakti_c_machine_class_init(ObjectClass *klass, void *data)
{
MachineClass *mc = MACHINE_CLASS(klass);
mc->desc = "RISC-V Board compatible with Shakti SDK";
mc->init = shakti_c_machine_state_init;
mc->default_cpu_type = TYPE_RISCV_CPU_SHAKTI_C;
mc->default_ram_id = "riscv.shakti.c.ram";
}
static const TypeInfo shakti_c_machine_type_info = {
.name = TYPE_RISCV_SHAKTI_MACHINE,
.parent = TYPE_MACHINE,
.class_init = shakti_c_machine_class_init,
.instance_init = shakti_c_machine_instance_init,
.instance_size = sizeof(ShaktiCMachineState),
};
static void shakti_c_machine_type_info_register(void)
{
type_register_static(&shakti_c_machine_type_info);
}
type_init(shakti_c_machine_type_info_register)
static void shakti_c_soc_state_realize(DeviceState *dev, Error **errp)
{
MachineState *ms = MACHINE(qdev_get_machine());
ShaktiCSoCState *sss = RISCV_SHAKTI_SOC(dev);
MemoryRegion *system_memory = get_system_memory();
sysbus_realize(SYS_BUS_DEVICE(&sss->cpus), &error_abort);
sss->plic = sifive_plic_create(shakti_c_memmap[SHAKTI_C_PLIC].base,
(char *)SHAKTI_C_PLIC_HART_CONFIG, ms->smp.cpus, 0,
SHAKTI_C_PLIC_NUM_SOURCES,
SHAKTI_C_PLIC_NUM_PRIORITIES,
SHAKTI_C_PLIC_PRIORITY_BASE,
SHAKTI_C_PLIC_PENDING_BASE,
SHAKTI_C_PLIC_ENABLE_BASE,
SHAKTI_C_PLIC_ENABLE_STRIDE,
SHAKTI_C_PLIC_CONTEXT_BASE,
SHAKTI_C_PLIC_CONTEXT_STRIDE,
shakti_c_memmap[SHAKTI_C_PLIC].size);
riscv_aclint_swi_create(shakti_c_memmap[SHAKTI_C_CLINT].base,
0, 1, false);
riscv_aclint_mtimer_create(shakti_c_memmap[SHAKTI_C_CLINT].base +
RISCV_ACLINT_SWI_SIZE,
RISCV_ACLINT_DEFAULT_MTIMER_SIZE, 0, 1,
RISCV_ACLINT_DEFAULT_MTIMECMP, RISCV_ACLINT_DEFAULT_MTIME,
RISCV_ACLINT_DEFAULT_TIMEBASE_FREQ, false);
qdev_prop_set_chr(DEVICE(&(sss->uart)), "chardev", serial_hd(0));
if (!sysbus_realize(SYS_BUS_DEVICE(&sss->uart), errp)) {
return;
}
sysbus_mmio_map(SYS_BUS_DEVICE(&sss->uart), 0,
shakti_c_memmap[SHAKTI_C_UART].base);
/* ROM */
memory_region_init_rom(&sss->rom, OBJECT(dev), "riscv.shakti.c.rom",
shakti_c_memmap[SHAKTI_C_ROM].size, &error_fatal);
memory_region_add_subregion(system_memory,
shakti_c_memmap[SHAKTI_C_ROM].base, &sss->rom);
}
static void shakti_c_soc_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = shakti_c_soc_state_realize;
/*
* Reasons:
* - Creates CPUS in riscv_hart_realize(), and can create unintended
* CPUs
* - Uses serial_hds in realize function, thus can't be used twice
*/
dc->user_creatable = false;
}
static void shakti_c_soc_instance_init(Object *obj)
{
ShaktiCSoCState *sss = RISCV_SHAKTI_SOC(obj);
object_initialize_child(obj, "cpus", &sss->cpus, TYPE_RISCV_HART_ARRAY);
object_initialize_child(obj, "uart", &sss->uart, TYPE_SHAKTI_UART);
/*
* CPU type is fixed and we are not supporting passing from commandline yet.
* So let it be in instance_init. When supported should use ms->cpu_type
* instead of TYPE_RISCV_CPU_SHAKTI_C
*/
object_property_set_str(OBJECT(&sss->cpus), "cpu-type",
TYPE_RISCV_CPU_SHAKTI_C, &error_abort);
object_property_set_int(OBJECT(&sss->cpus), "num-harts", 1,
&error_abort);
}
static const TypeInfo shakti_c_type_info = {
.name = TYPE_RISCV_SHAKTI_SOC,
.parent = TYPE_DEVICE,
.class_init = shakti_c_soc_class_init,
.instance_init = shakti_c_soc_instance_init,
.instance_size = sizeof(ShaktiCSoCState),
};
static void shakti_c_type_info_register(void)
{
type_register_static(&shakti_c_type_info);
}
type_init(shakti_c_type_info_register)