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hw/arm: Add basic power management to raspi. 

This is just enough to make reboot and poweroff work. Works for
linux, u-boot, and the arm trusted firmware. Not tested, but should
work for plan9, and bare-metal/hobby OSes, since they seem to generally
do what linux does for reset.

The watchdog timer functionality is not yet implemented.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/64
Signed-off-by: Nolan Leake <nolan@sigbus.net>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20210625210209.1870217-1-nolan@sigbus.net
[PMM: tweaked commit title; fixed region size to 0x200;
 moved header file to include/]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Nolan Leake 2021-06-25 14:02:09 -07:00 committed by Peter Maydell
parent fd17995c07
commit 38f2cfbbc3
5 changed files with 204 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
hw/arm/bcm2835_peripherals.c
View File

@ -126,6 +126,10 @@ static void bcm2835_peripherals_init(Object *obj)
object_property_add_const_link(OBJECT(&s->dwc2), "dma-mr",
OBJECT(&s->gpu_bus_mr));
/* Power Management */
object_initialize_child(obj, "powermgt", &s->powermgt,
TYPE_BCM2835_POWERMGT);
}
static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp)
@ -364,9 +368,16 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp)
qdev_get_gpio_in_named(DEVICE(&s->ic), BCM2835_IC_GPU_IRQ,
INTERRUPT_USB));
/* Power Management */
if (!sysbus_realize(SYS_BUS_DEVICE(&s->powermgt), errp)) {
return;
}
memory_region_add_subregion(&s->peri_mr, PM_OFFSET,
sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->powermgt), 0));
create_unimp(s, &s->txp, "bcm2835-txp", TXP_OFFSET, 0x1000);
create_unimp(s, &s->armtmr, "bcm2835-sp804", ARMCTRL_TIMER0_1_OFFSET, 0x40);
create_unimp(s, &s->powermgt, "bcm2835-powermgt", PM_OFFSET, 0x114);
create_unimp(s, &s->i2s, "bcm2835-i2s", I2S_OFFSET, 0x100);
create_unimp(s, &s->smi, "bcm2835-smi", SMI_OFFSET, 0x100);
create_unimp(s, &s->spi[0], "bcm2835-spi0", SPI0_OFFSET, 0x20);

160
hw/misc/bcm2835_powermgt.c Normal file
View File

@ -0,0 +1,160 @@
/*
* BCM2835 Power Management emulation
*
* Copyright (C) 2017 Marcin Chojnacki <marcinch7@gmail.com>
* Copyright (C) 2021 Nolan Leake <nolan@sigbus.net>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "hw/misc/bcm2835_powermgt.h"
#include "migration/vmstate.h"
#include "sysemu/runstate.h"
#define PASSWORD 0x5a000000
#define PASSWORD_MASK 0xff000000
#define R_RSTC 0x1c
#define V_RSTC_RESET 0x20
#define R_RSTS 0x20
#define V_RSTS_POWEROFF 0x555 /* Linux uses partition 63 to indicate halt. */
#define R_WDOG 0x24
static uint64_t bcm2835_powermgt_read(void *opaque, hwaddr offset,
unsigned size)
{
BCM2835PowerMgtState *s = (BCM2835PowerMgtState *)opaque;
uint32_t res = 0;
switch (offset) {
case R_RSTC:
res = s->rstc;
break;
case R_RSTS:
res = s->rsts;
break;
case R_WDOG:
res = s->wdog;
break;
default:
qemu_log_mask(LOG_UNIMP,
"bcm2835_powermgt_read: Unknown offset 0x%08"HWADDR_PRIx
"\n", offset);
res = 0;
break;
}
return res;
}
static void bcm2835_powermgt_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
BCM2835PowerMgtState *s = (BCM2835PowerMgtState *)opaque;
if ((value & PASSWORD_MASK) != PASSWORD) {
qemu_log_mask(LOG_GUEST_ERROR,
"bcm2835_powermgt_write: Bad password 0x%"PRIx64
" at offset 0x%08"HWADDR_PRIx"\n",
value, offset);
return;
}
value = value & ~PASSWORD_MASK;
switch (offset) {
case R_RSTC:
s->rstc = value;
if (value & V_RSTC_RESET) {
if ((s->rsts & 0xfff) == V_RSTS_POWEROFF) {
qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
} else {
qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
}
}
break;
case R_RSTS:
qemu_log_mask(LOG_UNIMP,
"bcm2835_powermgt_write: RSTS\n");
s->rsts = value;
break;
case R_WDOG:
qemu_log_mask(LOG_UNIMP,
"bcm2835_powermgt_write: WDOG\n");
s->wdog = value;
break;
default:
qemu_log_mask(LOG_UNIMP,
"bcm2835_powermgt_write: Unknown offset 0x%08"HWADDR_PRIx
"\n", offset);
break;
}
}
static const MemoryRegionOps bcm2835_powermgt_ops = {
.read = bcm2835_powermgt_read,
.write = bcm2835_powermgt_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.impl.min_access_size = 4,
.impl.max_access_size = 4,
};
static const VMStateDescription vmstate_bcm2835_powermgt = {
.name = TYPE_BCM2835_POWERMGT,
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(rstc, BCM2835PowerMgtState),
VMSTATE_UINT32(rsts, BCM2835PowerMgtState),
VMSTATE_UINT32(wdog, BCM2835PowerMgtState),
VMSTATE_END_OF_LIST()
}
};
static void bcm2835_powermgt_init(Object *obj)
{
BCM2835PowerMgtState *s = BCM2835_POWERMGT(obj);
memory_region_init_io(&s->iomem, obj, &bcm2835_powermgt_ops, s,
TYPE_BCM2835_POWERMGT, 0x200);
sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
}
static void bcm2835_powermgt_reset(DeviceState *dev)
{
BCM2835PowerMgtState *s = BCM2835_POWERMGT(dev);
/* https://elinux.org/BCM2835_registers#PM */
s->rstc = 0x00000102;
s->rsts = 0x00001000;
s->wdog = 0x00000000;
}
static void bcm2835_powermgt_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->reset = bcm2835_powermgt_reset;
dc->vmsd = &vmstate_bcm2835_powermgt;
}
static TypeInfo bcm2835_powermgt_info = {
.name = TYPE_BCM2835_POWERMGT,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(BCM2835PowerMgtState),
.class_init = bcm2835_powermgt_class_init,
.instance_init = bcm2835_powermgt_init,
};
static void bcm2835_powermgt_register_types(void)
{
type_register_static(&bcm2835_powermgt_info);
}
type_init(bcm2835_powermgt_register_types)

1
hw/misc/meson.build
View File

@ -82,6 +82,7 @@ softmmu_ss.add(when: 'CONFIG_RASPI', if_true: files(
'bcm2835_rng.c',
'bcm2835_thermal.c',
'bcm2835_cprman.c',
'bcm2835_powermgt.c',
))
softmmu_ss.add(when: 'CONFIG_SLAVIO', if_true: files('slavio_misc.c'))
softmmu_ss.add(when: 'CONFIG_ZYNQ', if_true: files('zynq_slcr.c', 'zynq-xadc.c'))

3
include/hw/arm/bcm2835_peripherals.h
View File

@ -24,6 +24,7 @@
#include "hw/misc/bcm2835_mphi.h"
#include "hw/misc/bcm2835_thermal.h"
#include "hw/misc/bcm2835_cprman.h"
#include "hw/misc/bcm2835_powermgt.h"
#include "hw/sd/sdhci.h"
#include "hw/sd/bcm2835_sdhost.h"
#include "hw/gpio/bcm2835_gpio.h"
@ -48,7 +49,7 @@ struct BCM2835PeripheralState {
BCM2835MphiState mphi;
UnimplementedDeviceState txp;
UnimplementedDeviceState armtmr;
UnimplementedDeviceState powermgt;
BCM2835PowerMgtState powermgt;
BCM2835CprmanState cprman;
PL011State uart0;
BCM2835AuxState aux;

29
include/hw/misc/bcm2835_powermgt.h Normal file
View File

@ -0,0 +1,29 @@
/*
* BCM2835 Power Management emulation
*
* Copyright (C) 2017 Marcin Chojnacki <marcinch7@gmail.com>
* Copyright (C) 2021 Nolan Leake <nolan@sigbus.net>
*
* 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 BCM2835_POWERMGT_H
#define BCM2835_POWERMGT_H
#include "hw/sysbus.h"
#include "qom/object.h"
#define TYPE_BCM2835_POWERMGT "bcm2835-powermgt"
OBJECT_DECLARE_SIMPLE_TYPE(BCM2835PowerMgtState, BCM2835_POWERMGT)
struct BCM2835PowerMgtState {
SysBusDevice busdev;
MemoryRegion iomem;
uint32_t rstc;
uint32_t rsts;
uint32_t wdog;
};
#endif