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authorSimon Glass2015-07-07 20:53:44 -0600
committerSimon Glass2015-08-06 07:44:28 -0600
commitf33017716e5c430d84366ecc4476ba2b655f3fef (patch)
tree6ac94703ce7c4374c81a35176ac541f97d91efb0 /drivers/core
parent0990fcb772192af615f23cd78bbfc081ec40236b (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.c17
-rw-r--r--drivers/core/simple-bus.c30
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[] = {