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 Reviewed-by: Vladimir Oltean vladimir.oltean@nxp.com
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Changes in v4: - make platform_bus_map_region() return void
Changes in v3: - extract platform bus virtual memory mapping codes to a new routine - add a "break" in case multiple "qemu,platform" nodes exist
Changes in v2: - turn on CONFIG_SIMPLE_BUS_CORRECT_RANGE in qemu-ppce500_defconfig
board/emulation/qemu-ppce500/Kconfig | 6 +++++ board/emulation/qemu-ppce500/qemu-ppce500.c | 29 +++++++++++++++++++++ configs/qemu-ppce500_defconfig | 1 + 3 files changed, 36 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..924cc02c4b 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> @@ -109,6 +111,17 @@ static int pci_map_region(phys_addr_t paddr, phys_size_t size, ulong *pmap_addr) return 0; }
+static void platform_bus_map_region(ulong map_addr, phys_addr_t paddr, + phys_size_t size) +{ + /* Align map_addr */ + map_addr += size - 1; + map_addr &= ~(size - 1); + + /* Map virtual memory for range */ + assert(!tlb_map_range(map_addr, paddr, size, TLB_MAP_IO)); +} + int misc_init_r(void) { struct udevice *dev; @@ -148,6 +161,22 @@ 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); + + platform_bus_map_region(CONFIG_PLATFORM_BUS_MAP_ADDR, + plat->target, plat->size); + break; + } + } + return 0; }
diff --git a/configs/qemu-ppce500_defconfig b/configs/qemu-ppce500_defconfig index 536fe7d6e1..151834b4cf 100644 --- a/configs/qemu-ppce500_defconfig +++ b/configs/qemu-ppce500_defconfig @@ -28,6 +28,7 @@ CONFIG_OF_BOARD=y CONFIG_ENV_OVERWRITE=y CONFIG_SYS_RELOC_GD_ENV_ADDR=y CONFIG_DM=y +CONFIG_SIMPLE_BUS_CORRECT_RANGE=y CONFIG_BLK=y CONFIG_HAVE_BLOCK_DEVICE=y CONFIG_MPC8XXX_GPIO=y