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/*
* QEMU SiFive U PRCI (Power, Reset, Clock, Interrupt)
*
* Copyright (c) 2019 Bin Meng <bmeng.cn@gmail.com>
*
* Simple model of the PRCI to emulate register reads made by the SDK BSP
*
* 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/sysbus.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "hw/riscv/sifive_u_prci.h"
static uint64_t sifive_u_prci_read(void *opaque, hwaddr addr, unsigned int size)
{
SiFiveUPRCIState *s = opaque;
switch (addr) {
case SIFIVE_U_PRCI_HFXOSCCFG:
return s->hfxosccfg;
case SIFIVE_U_PRCI_COREPLLCFG0:
return s->corepllcfg0;
case SIFIVE_U_PRCI_DDRPLLCFG0:
return s->ddrpllcfg0;
case SIFIVE_U_PRCI_DDRPLLCFG1:
return s->ddrpllcfg1;
case SIFIVE_U_PRCI_GEMGXLPLLCFG0:
return s->gemgxlpllcfg0;
case SIFIVE_U_PRCI_GEMGXLPLLCFG1:
return s->gemgxlpllcfg1;
case SIFIVE_U_PRCI_CORECLKSEL:
return s->coreclksel;
case SIFIVE_U_PRCI_DEVICESRESET:
return s->devicesreset;
case SIFIVE_U_PRCI_CLKMUXSTATUS:
return s->clkmuxstatus;
}
qemu_log_mask(LOG_GUEST_ERROR, "%s: read: addr=0x%" HWADDR_PRIx "\n",
__func__, addr);
return 0;
}
static void sifive_u_prci_write(void *opaque, hwaddr addr,
uint64_t val64, unsigned int size)
{
SiFiveUPRCIState *s = opaque;
uint32_t val32 = (uint32_t)val64;
switch (addr) {
case SIFIVE_U_PRCI_HFXOSCCFG:
s->hfxosccfg = val32;
/* OSC stays ready */
s->hfxosccfg |= SIFIVE_U_PRCI_HFXOSCCFG_RDY;
break;
case SIFIVE_U_PRCI_COREPLLCFG0:
s->corepllcfg0 = val32;
/* internal feedback */
s->corepllcfg0 |= SIFIVE_U_PRCI_PLLCFG0_FSE;
/* PLL stays locked */
s->corepllcfg0 |= SIFIVE_U_PRCI_PLLCFG0_LOCK;
break;
case SIFIVE_U_PRCI_DDRPLLCFG0:
s->ddrpllcfg0 = val32;
/* internal feedback */
s->ddrpllcfg0 |= SIFIVE_U_PRCI_PLLCFG0_FSE;
/* PLL stays locked */
s->ddrpllcfg0 |= SIFIVE_U_PRCI_PLLCFG0_LOCK;
break;
case SIFIVE_U_PRCI_DDRPLLCFG1:
s->ddrpllcfg1 = val32;
break;
case SIFIVE_U_PRCI_GEMGXLPLLCFG0:
s->gemgxlpllcfg0 = val32;
/* internal feedback */
s->gemgxlpllcfg0 |= SIFIVE_U_PRCI_PLLCFG0_FSE;
/* PLL stays locked */
s->gemgxlpllcfg0 |= SIFIVE_U_PRCI_PLLCFG0_LOCK;
break;
case SIFIVE_U_PRCI_GEMGXLPLLCFG1:
s->gemgxlpllcfg1 = val32;
break;
case SIFIVE_U_PRCI_CORECLKSEL:
s->coreclksel = val32;
break;
case SIFIVE_U_PRCI_DEVICESRESET:
s->devicesreset = val32;
break;
case SIFIVE_U_PRCI_CLKMUXSTATUS:
s->clkmuxstatus = val32;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: bad write: addr=0x%" HWADDR_PRIx
" v=0x%x\n", __func__, addr, val32);
}
}
static const MemoryRegionOps sifive_u_prci_ops = {
.read = sifive_u_prci_read,
.write = sifive_u_prci_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid = {
.min_access_size = 4,
.max_access_size = 4
}
};
static void sifive_u_prci_realize(DeviceState *dev, Error **errp)
{
SiFiveUPRCIState *s = SIFIVE_U_PRCI(dev);
memory_region_init_io(&s->mmio, OBJECT(dev), &sifive_u_prci_ops, s,
TYPE_SIFIVE_U_PRCI, SIFIVE_U_PRCI_REG_SIZE);
sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->mmio);
}
static void sifive_u_prci_reset(DeviceState *dev)
{
SiFiveUPRCIState *s = SIFIVE_U_PRCI(dev);
/* Initialize register to power-on-reset values */
s->hfxosccfg = SIFIVE_U_PRCI_HFXOSCCFG_RDY | SIFIVE_U_PRCI_HFXOSCCFG_EN;
s->corepllcfg0 = SIFIVE_U_PRCI_PLLCFG0_DIVR | SIFIVE_U_PRCI_PLLCFG0_DIVF |
SIFIVE_U_PRCI_PLLCFG0_DIVQ | SIFIVE_U_PRCI_PLLCFG0_FSE |
SIFIVE_U_PRCI_PLLCFG0_LOCK;
s->ddrpllcfg0 = SIFIVE_U_PRCI_PLLCFG0_DIVR | SIFIVE_U_PRCI_PLLCFG0_DIVF |
SIFIVE_U_PRCI_PLLCFG0_DIVQ | SIFIVE_U_PRCI_PLLCFG0_FSE |
SIFIVE_U_PRCI_PLLCFG0_LOCK;
s->gemgxlpllcfg0 = SIFIVE_U_PRCI_PLLCFG0_DIVR | SIFIVE_U_PRCI_PLLCFG0_DIVF |
SIFIVE_U_PRCI_PLLCFG0_DIVQ | SIFIVE_U_PRCI_PLLCFG0_FSE |
SIFIVE_U_PRCI_PLLCFG0_LOCK;
s->coreclksel = SIFIVE_U_PRCI_CORECLKSEL_HFCLK;
}
static void sifive_u_prci_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = sifive_u_prci_realize;
dc->reset = sifive_u_prci_reset;
}
static const TypeInfo sifive_u_prci_info = {
.name = TYPE_SIFIVE_U_PRCI,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(SiFiveUPRCIState),
.class_init = sifive_u_prci_class_init,
};
static void sifive_u_prci_register_types(void)
{
type_register_static(&sifive_u_prci_info);
}
type_init(sifive_u_prci_register_types)
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