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dm: Support address translation for simple-bus

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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>
This commit is contained in:
Simon Glass 2015-07-07 20:53:44 -06:00
parent 0990fcb772
commit f33017716e
3 changed files with 54 additions and 7 deletions
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19
drivers/core/device.c
View File

@ -552,17 +552,22 @@ const char *dev_get_uclass_name(struct udevice *dev)
return dev->uclass->uc_drv->name;
}
fdt_addr_t dev_get_addr(struct udevice *dev)
{
#ifdef CONFIG_OF_CONTROL
fdt_addr_t dev_get_addr(struct udevice *dev)
{
return fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
}
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)
{

30
drivers/core/simple-bus.c
View File

@ -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[] = {

12
include/dm/device-internal.h
View File

@ -139,6 +139,18 @@ void device_free(struct udevice *dev);
static inline void device_free(struct udevice *dev) {}
#endif
/**
* simple_bus_translate() - translate a bus address to a system address
*
* This handles the 'ranges' property in a simple bus. It translates the
* device address @addr to a system address using this property.
*
* @dev: Simple bus device (parent of target device)
* @addr: Address to translate
* @return new address
*/
fdt_addr_t simple_bus_translate(struct udevice *dev, fdt_addr_t addr);
/* Cast away any volatile pointer */
#define DM_ROOT_NON_CONST (((gd_t *)gd)->dm_root)
#define DM_UCLASS_ROOT_NON_CONST (((gd_t *)gd)->uclass_root)