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aspeed: sbc: Allow per-machine settings

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In order to correctly report secure boot running firmware the values
of certain registers must be set.

We don't yet have documentation from ASPEED on what they mean. The
meaning is inferred from u-boot's use of them.

Introduce properties so the settings can be configured per-machine.

Reviewed-by: Peter Delevoryas <pdel@fb.com>
Tested-by: Peter Delevoryas <pdel@fb.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Message-Id: <20220628154740.1117349-4-clg@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
This commit is contained in:
Joel Stanley 2022-07-14 16:24:38 +02:00 committed by Cédric Le Goater
parent 08c9f7eec7
commit 54ee564132
2 changed files with 53 additions and 2 deletions
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42
hw/misc/aspeed_sbc.c
View File

@ -11,6 +11,7 @@
#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"
@ -19,6 +20,27 @@
#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);
@ -80,8 +102,17 @@ static void aspeed_sbc_reset(DeviceState *dev)
memset(s->regs, 0, sizeof(s->regs));
/* Set secure boot enabled with RSA4096_SHA256 and enable eMMC ABR */
s->regs[R_STATUS] = 0x000044C6;
s->regs[R_QSR] = 0x07C07C89;
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)
@ -105,6 +136,12 @@ static const VMStateDescription vmstate_aspeed_sbc = {
}
};
static Property aspeed_sbc_properties[] = {
DEFINE_PROP_BOOL("emmc-abr", AspeedSBCState, emmc_abr, 0),
DEFINE_PROP_UINT32("signing-settings", AspeedSBCState, signing_settings, 0),
DEFINE_PROP_END_OF_LIST(),
};
static void aspeed_sbc_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
@ -112,6 +149,7 @@ static void aspeed_sbc_class_init(ObjectClass *klass, void *data)
dc->realize = aspeed_sbc_realize;
dc->reset = aspeed_sbc_reset;
dc->vmsd = &vmstate_aspeed_sbc;
device_class_set_props(dc, aspeed_sbc_properties);
}
static const TypeInfo aspeed_sbc_info = {

13
include/hw/misc/aspeed_sbc.h
View File

@ -17,9 +17,22 @@ OBJECT_DECLARE_TYPE(AspeedSBCState, AspeedSBCClass, ASPEED_SBC)
#define ASPEED_SBC_NR_REGS (0x93c >> 2)
#define QSR_AES BIT(27)
#define QSR_RSA1024 (0x0 << 12)
#define QSR_RSA2048 (0x1 << 12)
#define QSR_RSA3072 (0x2 << 12)
#define QSR_RSA4096 (0x3 << 12)
#define QSR_SHA224 (0x0 << 10)
#define QSR_SHA256 (0x1 << 10)
#define QSR_SHA384 (0x2 << 10)
#define QSR_SHA512 (0x3 << 10)
struct AspeedSBCState {
SysBusDevice parent;
bool emmc_abr;
uint32_t signing_settings;
MemoryRegion iomem;
uint32_t regs[ASPEED_SBC_NR_REGS];