diff options
author | Simon Glass | 2015-07-07 20:53:44 -0600 |
---|---|---|
committer | Simon Glass | 2015-08-06 07:44:28 -0600 |
commit | f33017716e5c430d84366ecc4476ba2b655f3fef (patch) | |
tree | 6ac94703ce7c4374c81a35176ac541f97d91efb0 /drivers/core | |
parent | 0990fcb772192af615f23cd78bbfc081ec40236b (diff) |
dm: Support address translation for simple-bus
The 'ranges' property can be used to specify a translation from the system
address to the bus address. Add support for this using the dev_get_addr()
function, which devices should use to find their address.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/core')
-rw-r--r-- | drivers/core/device.c | 17 | ||||
-rw-r--r-- | drivers/core/simple-bus.c | 30 |
2 files changed, 41 insertions, 6 deletions
diff --git a/drivers/core/device.c b/drivers/core/device.c index 51b1b44e5b0..d65717ddc7e 100644 --- a/drivers/core/device.c +++ b/drivers/core/device.c @@ -552,17 +552,22 @@ const char *dev_get_uclass_name(struct udevice *dev) return dev->uclass->uc_drv->name; } -#ifdef CONFIG_OF_CONTROL fdt_addr_t dev_get_addr(struct udevice *dev) { - return fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg"); -} +#ifdef CONFIG_OF_CONTROL + fdt_addr_t addr; + + addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg"); + if (addr != FDT_ADDR_T_NONE) { + if (device_get_uclass_id(dev->parent) == UCLASS_SIMPLE_BUS) + addr = simple_bus_translate(dev->parent, addr); + } + + return addr; #else -fdt_addr_t dev_get_addr(struct udevice *dev) -{ return FDT_ADDR_T_NONE; -} #endif +} bool device_has_children(struct udevice *dev) { diff --git a/drivers/core/simple-bus.c b/drivers/core/simple-bus.c index 3ea4d8230bd..913c3ccc70b 100644 --- a/drivers/core/simple-bus.c +++ b/drivers/core/simple-bus.c @@ -10,8 +10,37 @@ DECLARE_GLOBAL_DATA_PTR; +struct simple_bus_plat { + u32 base; + u32 size; + u32 target; +}; + +fdt_addr_t simple_bus_translate(struct udevice *dev, fdt_addr_t addr) +{ + struct simple_bus_plat *plat = dev_get_uclass_platdata(dev); + + if (addr >= plat->base && addr < plat->base + plat->size) + addr = (addr - plat->base) + plat->target; + + return addr; +} + static int simple_bus_post_bind(struct udevice *dev) { + u32 cell[3]; + int ret; + + ret = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset, "ranges", + cell, ARRAY_SIZE(cell)); + if (!ret) { + struct simple_bus_plat *plat = dev_get_uclass_platdata(dev); + + plat->base = cell[0]; + plat->target = cell[1]; + plat->size = cell[2]; + } + return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false); } @@ -19,6 +48,7 @@ UCLASS_DRIVER(simple_bus) = { .id = UCLASS_SIMPLE_BUS, .name = "simple_bus", .post_bind = simple_bus_post_bind, + .per_device_platdata_auto_alloc_size = sizeof(struct simple_bus_plat), }; static const struct udevice_id generic_simple_bus_ids[] = { |