Commit e1ecdc630d for qemu.org

commit e1ecdc630d7aaee85cbf22b3b6b3a4da19763521
Author: Bibo Mao <maobibo@loongson.cn>
Date:   Wed Sep 18 09:42:06 2024 +0800

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

    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>

diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c
index ddd886f69b..9a635d1d3d 100644
--- a/hw/loongarch/virt.c
+++ b/hw/loongarch/virt.c
@@ -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);