We need to tell the guest where devices are in its physical address space and how they are connected to IRQ lines.
This patch adds a simply PlatBus walker that generates device tree chunks for every device it finds. The only device it knows how to handle today is a serial port, but that may change in the future. Signed-off-by: Alexander Graf <ag...@suse.de> --- hw/ppc/e500.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 50 insertions(+), 4 deletions(-) diff --git a/hw/ppc/e500.c b/hw/ppc/e500.c index 8548622..e0d0a19 100644 --- a/hw/ppc/e500.c +++ b/hw/ppc/e500.c @@ -38,6 +38,7 @@ #include "hw/pci-host/ppce500.h" #include "hw/platbus/bridge.h" #include "hw/platbus/device.h" +#include "hw/char/serial-platbus.h" #define EPAPR_MAGIC (0x45504150) #define BINARY_DEVICE_TREE_FILE "mpc8544ds.dtb" @@ -108,7 +109,7 @@ static uint32_t *pci_map_create(void *fdt, uint32_t mpic, int first_slot, } static void dt_serial_create(void *fdt, unsigned long long offset, - const char *soc, const char *mpic, + const char *soc, const char *mpic, int irq, const char *alias, int idx, bool defcon) { char ser[128]; @@ -120,7 +121,7 @@ static void dt_serial_create(void *fdt, unsigned long long offset, qemu_devtree_setprop_cells(fdt, ser, "reg", offset, 0x100); qemu_devtree_setprop_cell(fdt, ser, "cell-index", idx); qemu_devtree_setprop_cell(fdt, ser, "clock-frequency", 0); - qemu_devtree_setprop_cells(fdt, ser, "interrupts", 42, 2); + qemu_devtree_setprop_cells(fdt, ser, "interrupts", irq, 2); qemu_devtree_setprop_phandle(fdt, ser, "interrupt-parent", mpic); qemu_devtree_setprop_string(fdt, "/aliases", alias, ser); @@ -129,6 +130,42 @@ static void dt_serial_create(void *fdt, unsigned long long offset, } } +static void platbus_create_devtree(DeviceState *dev, void *fdt, + const char *node, uint64_t addr, + const char *mpic, int irq_start, + int nr_irqs) +{ + PlatBusBridgeState *s = PLATBUS_BRIDGE(dev); + BusChild *kid; + const char platcomp[] = "qemu,platbus\0simple-bus"; + int serial_idx = 2; + + qemu_devtree_setprop(fdt, node, "compatible", platcomp, sizeof(platcomp)); + qemu_devtree_setprop_string(fdt, node, "device_type", "platbus"); + + /* Our platbus hole is less than 32bit big, so 1 cell is enough for address + and size */ + qemu_devtree_setprop_cells(fdt, node, "#size-cells", 1); + qemu_devtree_setprop_cells(fdt, node, "#address-cells", 1); + qemu_devtree_setprop_cells(fdt, node, "ranges", 0, addr >> 32, addr, + PLATBUS_HOLE); + + qemu_devtree_setprop_phandle(fdt, node, "interrupt-parent", mpic); + + QTAILQ_FOREACH(kid, &s->bus.parent_obj.children, sibling) { + DeviceState *dev = kid->child; + PlatBusDeviceState *pbd = PLATBUS_DEVICE(dev); + + if (PLATBUS_SERIAL(dev)) { + char *alias = g_strdup_printf("serial%d", serial_idx); + dt_serial_create(fdt, pbd->plat_region_addrs[0], node, + mpic, irq_start + pbd->plat_irqs[0], alias, + serial_idx, serial_idx == 0); + serial_idx++; + } + } +} + static int ppce500_load_device_tree(PPCE500Params *params, hwaddr addr, hwaddr initrd_base, @@ -136,6 +173,7 @@ static int ppce500_load_device_tree(PPCE500Params *params, bool dry_run) { CPUPPCState *env = first_cpu->env_ptr; + DeviceState *platbus; int ret = -1; uint64_t mem_reg_property[] = { 0, cpu_to_be64(params->ram_size) }; int fdt_size; @@ -310,9 +348,9 @@ static int ppce500_load_device_tree(PPCE500Params *params, * devices in reverse order to the dt. */ dt_serial_create(fdt, MPC8544_SERIAL1_REGS_OFFSET, - soc, mpic, "serial1", 1, false); + soc, mpic, 42, "serial1", 1, false); dt_serial_create(fdt, MPC8544_SERIAL0_REGS_OFFSET, - soc, mpic, "serial0", 0, true); + soc, mpic, 42, "serial0", 0, true); snprintf(gutil, sizeof(gutil), "%s/global-utilities@%llx", soc, MPC8544_UTIL_OFFSET); @@ -367,6 +405,14 @@ static int ppce500_load_device_tree(PPCE500Params *params, qemu_devtree_setprop_cell(fdt, pci, "#address-cells", 3); qemu_devtree_setprop_string(fdt, "/aliases", "pci0", pci); + platbus = qdev_find_recursive(sysbus_get_default(), "platbus"); + if (platbus) { + qemu_devtree_add_subnode(fdt, "/platbus"); + platbus_create_devtree(platbus, fdt, "/platbus", E500_PLATBUS_BASE, + mpic, E500_PLATBUS_FIRST_IRQ, + E500_PLATBUS_NUM_IRQS); + } + params->fixup_devtree(params, fdt); if (toplevel_compat) { -- 1.8.1.4