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hw/loongarch/virt: Add FDT table support with acpi ged pm register

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ACPI ged is used for power management on LoongArch virt platform, in
general it is parsed from acpi table. However if system boot directly from
elf kernel, no UEFI bios is provided and acpi table cannot be used also.

Here acpi ged pm register is exposed with FDT table, it is compatbile
with syscon method in FDT table, only that acpi ged pm register is accessed
with 8-bit mode, rather with 32-bit mode.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Tested-by: Song Gao <gaosong@loongson.cn>
Message-Id: <20240918014206.2165821-3-maobibo@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
This commit is contained in:
Bibo Mao 2024-09-18 09:42:06 +08:00 committed by Song Gao
parent edafc90ba4
commit e1ecdc630d
1 changed files with 39 additions and 0 deletions
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39
hw/loongarch/virt.c
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@ -280,6 +280,44 @@ static void fdt_add_rtc_node(LoongArchVirtMachineState *lvms,
g_free(nodename);
}
static void fdt_add_ged_reset(LoongArchVirtMachineState *lvms)
{
char *name;
uint32_t ged_handle;
MachineState *ms = MACHINE(lvms);
hwaddr base = VIRT_GED_REG_ADDR;
hwaddr size = ACPI_GED_REG_COUNT;
ged_handle = qemu_fdt_alloc_phandle(ms->fdt);
name = g_strdup_printf("/ged@%" PRIx64, base);
qemu_fdt_add_subnode(ms->fdt, name);
qemu_fdt_setprop_string(ms->fdt, name, "compatible", "syscon");
qemu_fdt_setprop_cells(ms->fdt, name, "reg", 0x0, base, 0x0, size);
/* 8 bit registers */
qemu_fdt_setprop_cell(ms->fdt, name, "reg-shift", 0);
qemu_fdt_setprop_cell(ms->fdt, name, "reg-io-width", 1);
qemu_fdt_setprop_cell(ms->fdt, name, "phandle", ged_handle);
ged_handle = qemu_fdt_get_phandle(ms->fdt, name);
g_free(name);
name = g_strdup_printf("/reboot");
qemu_fdt_add_subnode(ms->fdt, name);
qemu_fdt_setprop_string(ms->fdt, name, "compatible", "syscon-reboot");
qemu_fdt_setprop_cell(ms->fdt, name, "regmap", ged_handle);
qemu_fdt_setprop_cell(ms->fdt, name, "offset", ACPI_GED_REG_RESET);
qemu_fdt_setprop_cell(ms->fdt, name, "value", ACPI_GED_RESET_VALUE);
g_free(name);
name = g_strdup_printf("/poweroff");
qemu_fdt_add_subnode(ms->fdt, name);
qemu_fdt_setprop_string(ms->fdt, name, "compatible", "syscon-poweroff");
qemu_fdt_setprop_cell(ms->fdt, name, "regmap", ged_handle);
qemu_fdt_setprop_cell(ms->fdt, name, "offset", ACPI_GED_REG_SLEEP_CTL);
qemu_fdt_setprop_cell(ms->fdt, name, "value", ACPI_GED_SLP_EN |
(ACPI_GED_SLP_TYP_S5 << ACPI_GED_SLP_TYP_POS));
g_free(name);
}
static void fdt_add_uart_node(LoongArchVirtMachineState *lvms,
uint32_t *pch_pic_phandle, hwaddr base,
int irq, bool chosen)
@ -737,6 +775,7 @@ static void virt_devices_init(DeviceState *pch_pic,
qdev_get_gpio_in(pch_pic,
VIRT_RTC_IRQ - VIRT_GSI_BASE));
fdt_add_rtc_node(lvms, pch_pic_phandle);
fdt_add_ged_reset(lvms);
/* acpi ged */
lvms->acpi_ged = create_acpi_ged(pch_pic, lvms);