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/*
* ASPEED Secure Boot Controller
*
* Copyright (C) 2021-2022 IBM Corp.
*
* Joel Stanley <joel@jms.id.au>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qemu/error-report.h"
#include "hw/qdev-properties.h"
#include "hw/misc/aspeed_sbc.h"
#include "qapi/error.h"
#include "migration/vmstate.h"
#define R_PROT (0x000 / 4)
#define R_STATUS (0x014 / 4)
#define R_QSR (0x040 / 4)
/* R_STATUS */
#define ABR_EN BIT(14) /* Mirrors SCU510[11] */
#define ABR_IMAGE_SOURCE BIT(13)
#define SPI_ABR_IMAGE_SOURCE BIT(12)
#define SB_CRYPTO_KEY_EXP_DONE BIT(11)
#define SB_CRYPTO_BUSY BIT(10)
#define OTP_WP_EN BIT(9)
#define OTP_ADDR_WP_EN BIT(8)
#define LOW_SEC_KEY_EN BIT(7)
#define SECURE_BOOT_EN BIT(6)
#define UART_BOOT_EN BIT(5)
/* bit 4 reserved*/
#define OTP_CHARGE_PUMP_READY BIT(3)
#define OTP_IDLE BIT(2)
#define OTP_MEM_IDLE BIT(1)
#define OTP_COMPARE_STATUS BIT(0)
/* QSR */
#define QSR_RSA_MASK (0x3 << 12)
#define QSR_HASH_MASK (0x3 << 10)
static uint64_t aspeed_sbc_read(void *opaque, hwaddr addr, unsigned int size)
{
AspeedSBCState *s = ASPEED_SBC(opaque);
addr >>= 2;
if (addr >= ASPEED_SBC_NR_REGS) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Out-of-bounds read at offset 0x%" HWADDR_PRIx "\n",
__func__, addr << 2);
return 0;
}
return s->regs[addr];
}
static void aspeed_sbc_write(void *opaque, hwaddr addr, uint64_t data,
unsigned int size)
{
AspeedSBCState *s = ASPEED_SBC(opaque);
addr >>= 2;
if (addr >= ASPEED_SBC_NR_REGS) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Out-of-bounds write at offset 0x%" HWADDR_PRIx "\n",
__func__, addr << 2);
return;
}
switch (addr) {
case R_STATUS:
case R_QSR:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to read only register 0x%" HWADDR_PRIx "\n",
__func__, addr << 2);
return;
default:
break;
}
s->regs[addr] = data;
}
static const MemoryRegionOps aspeed_sbc_ops = {
.read = aspeed_sbc_read,
.write = aspeed_sbc_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 4,
},
};
static void aspeed_sbc_reset(DeviceState *dev)
{
struct AspeedSBCState *s = ASPEED_SBC(dev);
memset(s->regs, 0, sizeof(s->regs));
/* Set secure boot enabled with RSA4096_SHA256 and enable eMMC ABR */
s->regs[R_STATUS] = OTP_IDLE | OTP_MEM_IDLE;
if (s->emmc_abr) {
s->regs[R_STATUS] &= ABR_EN;
}
if (s->signing_settings) {
s->regs[R_STATUS] &= SECURE_BOOT_EN;
}
s->regs[R_QSR] = s->signing_settings;
}
static void aspeed_sbc_realize(DeviceState *dev, Error **errp)
{
AspeedSBCState *s = ASPEED_SBC(dev);
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_sbc_ops, s,
TYPE_ASPEED_SBC, 0x1000);
sysbus_init_mmio(sbd, &s->iomem);
}
static const VMStateDescription vmstate_aspeed_sbc = {
.name = TYPE_ASPEED_SBC,
.version_id = 1,
.minimum_version_id = 1,
.fields = (const VMStateField[]) {
VMSTATE_UINT32_ARRAY(regs, AspeedSBCState, ASPEED_SBC_NR_REGS),
VMSTATE_END_OF_LIST(),
}
};
static const Property aspeed_sbc_properties[] = {
DEFINE_PROP_BOOL("emmc-abr", AspeedSBCState, emmc_abr, 0),
DEFINE_PROP_UINT32("signing-settings", AspeedSBCState, signing_settings, 0),
};
static void aspeed_sbc_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = aspeed_sbc_realize;
device_class_set_legacy_reset(dc, aspeed_sbc_reset);
dc->vmsd = &vmstate_aspeed_sbc;
device_class_set_props(dc, aspeed_sbc_properties);
}
static const TypeInfo aspeed_sbc_info = {
.name = TYPE_ASPEED_SBC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(AspeedSBCState),
.class_init = aspeed_sbc_class_init,
.class_size = sizeof(AspeedSBCClass)
};
static void aspeed_ast2600_sbc_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->desc = "AST2600 Secure Boot Controller";
}
static const TypeInfo aspeed_ast2600_sbc_info = {
.name = TYPE_ASPEED_AST2600_SBC,
.parent = TYPE_ASPEED_SBC,
.class_init = aspeed_ast2600_sbc_class_init,
};
static void aspeed_sbc_register_types(void)
{
type_register_static(&aspeed_ast2600_sbc_info);
type_register_static(&aspeed_sbc_info);
}
type_init(aspeed_sbc_register_types);
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