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hw/arm: Add basic power management to raspi.

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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
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13
hw/arm/bcm2835_peripherals.c
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@ -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);