i.MX: Add code to emulate i.MX7 SNVS IP-block

Add code to emulate SNVS IP-block. Currently only the bits needed to
be able to emulate machine shutdown are implemented.

Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Philippe Mathieu-Daudé <f4bug@amsat.org>
Cc: Marcel Apfelbaum <marcel.apfelbaum@zoho.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: qemu-devel@nongnu.org
Cc: qemu-arm@nongnu.org
Cc: yurovsky@gmail.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Andrey Smirnov 2018-02-09 10:40:30 +00:00 committed by Peter Maydell
parent 067e68e704
commit 0a7bc1c045
3 changed files with 119 additions and 0 deletions

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@ -35,6 +35,7 @@ obj-$(CONFIG_IMX) += imx6_ccm.o
obj-$(CONFIG_IMX) += imx6_src.o
obj-$(CONFIG_IMX) += imx7_ccm.o
obj-$(CONFIG_IMX) += imx2_wdt.o
obj-$(CONFIG_IMX) += imx7_snvs.o
obj-$(CONFIG_MILKYMIST) += milkymist-hpdmc.o
obj-$(CONFIG_MILKYMIST) += milkymist-pfpu.o
obj-$(CONFIG_MAINSTONE) += mst_fpga.o

83
hw/misc/imx7_snvs.c Normal file
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@ -0,0 +1,83 @@
/*
* IMX7 Secure Non-Volatile Storage
*
* Copyright (c) 2018, Impinj, Inc.
*
* Author: Andrey Smirnov <andrew.smirnov@gmail.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
* Bare minimum emulation code needed to support being able to shut
* down linux guest gracefully.
*/
#include "qemu/osdep.h"
#include "hw/misc/imx7_snvs.h"
#include "qemu/log.h"
#include "sysemu/sysemu.h"
static uint64_t imx7_snvs_read(void *opaque, hwaddr offset, unsigned size)
{
return 0;
}
static void imx7_snvs_write(void *opaque, hwaddr offset,
uint64_t v, unsigned size)
{
const uint32_t value = v;
const uint32_t mask = SNVS_LPCR_TOP | SNVS_LPCR_DP_EN;
if (offset == SNVS_LPCR && ((value & mask) == mask)) {
qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
}
}
static const struct MemoryRegionOps imx7_snvs_ops = {
.read = imx7_snvs_read,
.write = imx7_snvs_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.impl = {
/*
* Our device would not work correctly if the guest was doing
* unaligned access. This might not be a limitation on the real
* device but in practice there is no reason for a guest to access
* this device unaligned.
*/
.min_access_size = 4,
.max_access_size = 4,
.unaligned = false,
},
};
static void imx7_snvs_init(Object *obj)
{
SysBusDevice *sd = SYS_BUS_DEVICE(obj);
IMX7SNVSState *s = IMX7_SNVS(obj);
memory_region_init_io(&s->mmio, obj, &imx7_snvs_ops, s,
TYPE_IMX7_SNVS, 0x1000);
sysbus_init_mmio(sd, &s->mmio);
}
static void imx7_snvs_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->desc = "i.MX7 Secure Non-Volatile Storage Module";
}
static const TypeInfo imx7_snvs_info = {
.name = TYPE_IMX7_SNVS,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(IMX7SNVSState),
.instance_init = imx7_snvs_init,
.class_init = imx7_snvs_class_init,
};
static void imx7_snvs_register_type(void)
{
type_register_static(&imx7_snvs_info);
}
type_init(imx7_snvs_register_type)

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@ -0,0 +1,35 @@
/*
* Copyright (c) 2017, Impinj, Inc.
*
* i.MX7 SNVS block emulation code
*
* Author: Andrey Smirnov <andrew.smirnov@gmail.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef IMX7_SNVS_H
#define IMX7_SNVS_H
#include "qemu/bitops.h"
#include "hw/sysbus.h"
enum IMX7SNVSRegisters {
SNVS_LPCR = 0x38,
SNVS_LPCR_TOP = BIT(6),
SNVS_LPCR_DP_EN = BIT(5)
};
#define TYPE_IMX7_SNVS "imx7.snvs"
#define IMX7_SNVS(obj) OBJECT_CHECK(IMX7SNVSState, (obj), TYPE_IMX7_SNVS)
typedef struct IMX7SNVSState {
/* <private> */
SysBusDevice parent_obj;
MemoryRegion mmio;
} IMX7SNVSState;
#endif /* IMX7_SNVS_H */