QEMU ppce500 target can dynamically instantiate an eTSEC device on a platform bus if "-device eTSEC" is given to QEMU. It is presented as a "simple-bus" in the device tree, with an additional compatible string "qemu,platform".
Let's create a virtual memory mapping for it in misc_init_r(), in preparation to adding eTSEC support.
Signed-off-by: Bin Meng bmeng.cn@gmail.com ---
board/emulation/qemu-ppce500/Kconfig | 6 ++++++ board/emulation/qemu-ppce500/qemu-ppce500.c | 18 ++++++++++++++++++ 2 files changed, 24 insertions(+)
diff --git a/board/emulation/qemu-ppce500/Kconfig b/board/emulation/qemu-ppce500/Kconfig index 4312d986d8..1c5aa18aa9 100644 --- a/board/emulation/qemu-ppce500/Kconfig +++ b/board/emulation/qemu-ppce500/Kconfig @@ -9,4 +9,10 @@ config SYS_VENDOR config SYS_CONFIG_NAME default "qemu-ppce500"
+config PLATFORM_BUS_MAP_ADDR + hex + default 0xf0000000 + help + The QEMU platform bus base mapped address in the virtual memory space. + endif diff --git a/board/emulation/qemu-ppce500/qemu-ppce500.c b/board/emulation/qemu-ppce500/qemu-ppce500.c index daa103c564..0960dd1f97 100644 --- a/board/emulation/qemu-ppce500/qemu-ppce500.c +++ b/board/emulation/qemu-ppce500/qemu-ppce500.c @@ -14,6 +14,8 @@ #include <net.h> #include <pci.h> #include <time.h> +#include <dm/simple_bus.h> +#include <dm/uclass-internal.h> #include <asm/global_data.h> #include <asm/processor.h> #include <asm/mmu.h> @@ -148,6 +150,22 @@ int misc_init_r(void) */ disable_tlb(find_tlb_idx((void *)CONFIG_SYS_TMPVIRT, 1));
+ /* + * Detect the presence of the platform bus node, and + * create a virtual memory mapping for it. + */ + for (ret = uclass_find_first_device(UCLASS_SIMPLE_BUS, &dev); + dev; + ret = uclass_find_next_device(&dev)) { + if (device_is_compatible(dev, "qemu,platform")) { + struct simple_bus_plat *plat = dev_get_uclass_plat(dev); + + assert(!tlb_map_range(CONFIG_PLATFORM_BUS_MAP_ADDR, + plat->target, plat->size, + TLB_MAP_IO)); + } + } + return 0; }