[PATCH 02/13] hw/riscv/fdt-common, virt.c: add create_fdt_syscon()

The soon to be added riscv-server-ref board will declare a syscon FDT
similar to what the 'virt' board already does.

It won't have a 'sifive,test0' and 'sifive,test1' compat string though,
hence we'll add a flag to enable/disable these additional properties.

The FDT is slightly changed: the subnode is now named 'soc/syscon' instead
of 'soc/test' to be compatible with the latest device-tree docs.

Signed-off-by: Daniel Henrique Barboza <[email protected]>
---
 hw/riscv/fdt-common.c         | 53 +++++++++++++++++++++++++++++++++++
 hw/riscv/virt.c               | 45 ++---------------------------
 include/hw/riscv/fdt-common.h |  4 +++
 3 files changed, 60 insertions(+), 42 deletions(-)

diff --git a/hw/riscv/fdt-common.c b/hw/riscv/fdt-common.c
index e74423a225..a2168c09ec 100644
--- a/hw/riscv/fdt-common.c
+++ b/hw/riscv/fdt-common.c
@@ -294,3 +294,56 @@ void create_fdt_flash(void *fdt, hwaddr flashbase, hwaddr flashsize)
                                  2, flashbase + flashsize, 2, flashsize);
     qemu_fdt_setprop_cell(fdt, name, "bank-width", 4);
 }
+
+/*
+ * @sifive_test_compat is used to create a FDT that declares
+ * compat with "sifive,test1" and "sifive,test0".  This happens
+ * to be the case for the 'virt' machine that also creates a
+ * 'sifive_test' syscon device.
+ */
+void create_fdt_syscon(void *fdt, uint32_t *phandle,
+                       hwaddr addr, hwaddr size,
+                       uint32_t reboot, uint32_t poweroff,
+                       bool sifive_test_compat)
+{
+    uint32_t syscon_phandle = (*phandle)++;
+    char *name;
+
+    name = g_strdup_printf("/soc/syscon@%"HWADDR_PRIx, addr);
+    qemu_fdt_add_subnode(fdt, name);
+
+    if (sifive_test_compat) {
+        static const char * const compat[3] = {
+            "sifive,test1", "sifive,test0", "syscon"
+        };
+
+        qemu_fdt_setprop_string_array(fdt, name, "compatible",
+                                      (char **)&compat, ARRAY_SIZE(compat));
+    } else {
+        qemu_fdt_setprop_string(fdt, name, "compatible", "syscon");
+    }
+
+    qemu_fdt_setprop_sized_cells(fdt, name, "reg",
+                                 2, addr,
+                                 2, size);
+
+    qemu_fdt_setprop_cell(fdt, name, "phandle", syscon_phandle);
+
+    g_free(name);
+
+    name = g_strdup_printf("/reboot");
+    qemu_fdt_add_subnode(fdt, name);
+    qemu_fdt_setprop_string(fdt, name, "compatible", "syscon-reboot");
+    qemu_fdt_setprop_cell(fdt, name, "regmap", syscon_phandle);
+    qemu_fdt_setprop_cell(fdt, name, "offset", 0x0);
+    qemu_fdt_setprop_cell(fdt, name, "value", reboot);
+    g_free(name);
+
+    name = g_strdup_printf("/poweroff");
+    qemu_fdt_add_subnode(fdt, name);
+    qemu_fdt_setprop_string(fdt, name, "compatible", "syscon-poweroff");
+    qemu_fdt_setprop_cell(fdt, name, "regmap", syscon_phandle);
+    qemu_fdt_setprop_cell(fdt, name, "offset", 0x0);
+    qemu_fdt_setprop_cell(fdt, name, "value", poweroff);
+    g_free(name);
+}
diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
index 33a121abd9..acbbe458fa 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -766,47 +766,6 @@ static void create_fdt_pcie(RISCVVirtState *s,
     create_pcie_irq_map(s, ms->fdt, name, irq_pcie_phandle);
 }
 
-static void create_fdt_reset(RISCVVirtState *s, uint32_t *phandle)
-{
-    char *name;
-    uint32_t test_phandle;
-    MachineState *ms = MACHINE(s);
-
-    test_phandle = (*phandle)++;
-    name = g_strdup_printf("/soc/test@%"HWADDR_PRIx,
-                           s->memmap[VIRT_TEST].base);
-    qemu_fdt_add_subnode(ms->fdt, name);
-    {
-        static const char * const compat[3] = {
-            "sifive,test1", "sifive,test0", "syscon"
-        };
-        qemu_fdt_setprop_string_array(ms->fdt, name, "compatible",
-                                      (char **)&compat, ARRAY_SIZE(compat));
-    }
-    qemu_fdt_setprop_sized_cells(ms->fdt, name, "reg",
-                                 2, s->memmap[VIRT_TEST].base,
-                                 2, s->memmap[VIRT_TEST].size);
-    qemu_fdt_setprop_cell(ms->fdt, name, "phandle", test_phandle);
-    test_phandle = 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", test_phandle);
-    qemu_fdt_setprop_cell(ms->fdt, name, "offset", 0x0);
-    qemu_fdt_setprop_cell(ms->fdt, name, "value", FINISHER_RESET);
-    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", test_phandle);
-    qemu_fdt_setprop_cell(ms->fdt, name, "offset", 0x0);
-    qemu_fdt_setprop_cell(ms->fdt, name, "value", FINISHER_PASS);
-    g_free(name);
-}
-
 static void create_fdt_uart(RISCVVirtState *s,
                             uint32_t irq_mmio_phandle, int memId, int irqNo)
 {
@@ -992,7 +951,9 @@ static void finalize_fdt(RISCVVirtState *s)
     create_fdt_pcie(s, irq_pcie_phandle, msi_pcie_phandle,
                     iommu_sys_phandle);
 
-    create_fdt_reset(s, &phandle);
+    create_fdt_syscon(MACHINE(s)->fdt, &phandle,
+                      s->memmap[VIRT_TEST].base, s->memmap[VIRT_TEST].size,
+                      FINISHER_RESET, FINISHER_PASS, true);
 
     create_fdt_uarts(s, irq_mmio_phandle);
 
diff --git a/include/hw/riscv/fdt-common.h b/include/hw/riscv/fdt-common.h
index 6e438e0278..31203df517 100644
--- a/include/hw/riscv/fdt-common.h
+++ b/include/hw/riscv/fdt-common.h
@@ -37,4 +37,8 @@ void create_fdt_plic(void *fdt, hwaddr addr, uint64_t size,
                      bool numa_enabled, int socket);
 void riscv_pmu_generate_fdt_node(void *fdt, uint32_t cmask, char *pmu_name);
 void create_fdt_flash(void *fdt, hwaddr flashbase, hwaddr flashsize);
+void create_fdt_syscon(void *fdt, uint32_t *phandle,
+                       hwaddr addr, hwaddr size,
+                       uint32_t reboot, uint32_t poweroff,
+                       bool sifive_test_compat);
 #endif
-- 
2.43.0