hw/riscv/sifive_u: Connect the Cadence GEM Ethernet device

Connect the Cadence GEM ethernet device. This also requires us to
expose the plic interrupt lines.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Michael Clark <mjc@sifive.com>

default-configs/riscv32-softmmu.mak

@@ -3,3 +3,5 @@
 CONFIG_SERIAL=y
 CONFIG_VIRTIO_MMIO=y
 include virtio.mak
+
+CONFIG_CADENCE=y

default-configs/riscv64-softmmu.mak

@@ -3,3 +3,5 @@
 CONFIG_SERIAL=y
 CONFIG_VIRTIO_MMIO=y
 include virtio.mak
+
+CONFIG_CADENCE=y

hw/riscv/sifive_u.c

@@ -60,8 +60,11 @@ static const struct MemmapEntry {
     [SIFIVE_U_UART0] =    { 0x10013000,     0x1000 },
     [SIFIVE_U_UART1] =    { 0x10023000,     0x1000 },
     [SIFIVE_U_DRAM] =     { 0x80000000,        0x0 },
+    [SIFIVE_U_GEM] =      { 0x100900FC,     0x2000 },
 };
 
+#define GEM_REVISION        0x10070109
+
 static uint64_t load_kernel(const char *kernel_filename)
 {
     uint64_t kernel_entry, kernel_high;
@@ -194,6 +197,27 @@ static void create_fdt(SiFiveUState *s, const struct MemmapEntry *memmap,
     g_free(cells);
     g_free(nodename);
 
+    nodename = g_strdup_printf("/soc/ethernet@%lx",
+        (long)memmap[SIFIVE_U_GEM].base);
+    qemu_fdt_add_subnode(fdt, nodename);
+    qemu_fdt_setprop_string(fdt, nodename, "compatible", "cdns,macb");
+    qemu_fdt_setprop_cells(fdt, nodename, "reg",
+        0x0, memmap[SIFIVE_U_GEM].base,
+        0x0, memmap[SIFIVE_U_GEM].size);
+    qemu_fdt_setprop_string(fdt, nodename, "reg-names", "control");
+    qemu_fdt_setprop_string(fdt, nodename, "phy-mode", "gmii");
+    qemu_fdt_setprop_cells(fdt, nodename, "interrupt-parent", plic_phandle);
+    qemu_fdt_setprop_cells(fdt, nodename, "interrupts", SIFIVE_U_GEM_IRQ);
+    qemu_fdt_setprop_cells(fdt, nodename, "#address-cells", 1);
+    qemu_fdt_setprop_cells(fdt, nodename, "#size-cells", 0);
+    g_free(nodename);
+
+    nodename = g_strdup_printf("/soc/ethernet@%lx/ethernet-phy@0",
+        (long)memmap[SIFIVE_U_GEM].base);
+    qemu_fdt_add_subnode(fdt, nodename);
+    qemu_fdt_setprop_cells(fdt, nodename, "reg", 0x0);
+    g_free(nodename);
+
     nodename = g_strdup_printf("/soc/uart@%lx",
         (long)memmap[SIFIVE_U_UART0].base);
     qemu_fdt_add_subnode(fdt, nodename);
@@ -286,6 +310,9 @@ static void riscv_sifive_u_soc_init(Object *obj)
                             &error_abort);
     object_property_set_int(OBJECT(&s->cpus), smp_cpus, "num-harts",
                             &error_abort);
+
+    object_initialize(&s->gem, sizeof(s->gem), TYPE_CADENCE_GEM);
+    qdev_set_parent_bus(DEVICE(&s->gem), sysbus_get_default());
 }
 
 static void riscv_sifive_u_soc_realize(DeviceState *dev, Error **errp)
@@ -294,6 +321,10 @@ static void riscv_sifive_u_soc_realize(DeviceState *dev, Error **errp)
     const struct MemmapEntry *memmap = sifive_u_memmap;
     MemoryRegion *system_memory = get_system_memory();
     MemoryRegion *mask_rom = g_new(MemoryRegion, 1);
+    qemu_irq plic_gpios[SIFIVE_U_PLIC_NUM_SOURCES];
+    int i;
+    Error *err = NULL;
+    NICInfo *nd = &nd_table[0];
 
     object_property_set_bool(OBJECT(&s->cpus), true, "realized",
                              &error_abort);
@@ -324,6 +355,25 @@ static void riscv_sifive_u_soc_realize(DeviceState *dev, Error **errp)
     sifive_clint_create(memmap[SIFIVE_U_CLINT].base,
         memmap[SIFIVE_U_CLINT].size, smp_cpus,
         SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE);
+
+    for (i = 0; i < SIFIVE_U_PLIC_NUM_SOURCES; i++) {
+        plic_gpios[i] = qdev_get_gpio_in(DEVICE(s->plic), i);
+    }
+
+    if (nd->used) {
+        qemu_check_nic_model(nd, TYPE_CADENCE_GEM);
+        qdev_set_nic_properties(DEVICE(&s->gem), nd);
+    }
+    object_property_set_int(OBJECT(&s->gem), GEM_REVISION, "revision",
+                            &error_abort);
+    object_property_set_bool(OBJECT(&s->gem), true, "realized", &err);
+    if (err) {
+        error_propagate(errp, err);
+        return;
+    }
+    sysbus_mmio_map(SYS_BUS_DEVICE(&s->gem), 0, memmap[SIFIVE_U_GEM].base);
+    sysbus_connect_irq(SYS_BUS_DEVICE(&s->gem), 0,
+                       plic_gpios[SIFIVE_U_GEM_IRQ]);
 }
 
 static void riscv_sifive_u_machine_init(MachineClass *mc)

include/hw/riscv/sifive_u.h

@@ -19,6 +19,8 @@
 #ifndef HW_SIFIVE_U_H
 #define HW_SIFIVE_U_H
 
+#include "hw/net/cadence_gem.h"
+
 #define TYPE_RISCV_U_SOC "riscv.sifive.u.soc"
 #define RISCV_U_SOC(obj) \
     OBJECT_CHECK(SiFiveUSoCState, (obj), TYPE_RISCV_U_SOC)
@@ -30,6 +32,7 @@ typedef struct SiFiveUSoCState {
     /*< public >*/
     RISCVHartArrayState cpus;
     DeviceState *plic;
+    CadenceGEMState gem;
 } SiFiveUSoCState;
 
 typedef struct SiFiveUState {
@@ -49,12 +52,14 @@ enum {
     SIFIVE_U_PLIC,
     SIFIVE_U_UART0,
     SIFIVE_U_UART1,
-    SIFIVE_U_DRAM
+    SIFIVE_U_DRAM,
+    SIFIVE_U_GEM
 };
 
 enum {
     SIFIVE_U_UART0_IRQ = 3,
-    SIFIVE_U_UART1_IRQ = 4
+    SIFIVE_U_UART1_IRQ = 4,
+    SIFIVE_U_GEM_IRQ = 0x35
 };
 
 enum {