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ppc: qemu: Create a virtual memory mapping of the platform bus 

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>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
This commit is contained in:
Bin Meng 2021-03-14 20:15:04 +08:00 committed by Priyanka Jain
parent ea8971cdde
commit b3398993ba
3 changed files with 36 additions and 0 deletions
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6
board/emulation/qemu-ppce500/Kconfig
View File

@ -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

29
board/emulation/qemu-ppce500/qemu-ppce500.c
View File

@ -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;
}

1
configs/qemu-ppce500_defconfig
View File

@ -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