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dm: core: implement dev_map_physmem()

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This API helps to map physical register addresss pace of device to
virtual address space easily. Its just a wrapper around map_physmem()
with MAP_NOCACHE flag.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Suggested-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jagan Teki <jteki@openedev.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Jagan Teki <jteki@openedev.com>
This commit is contained in:
Vignesh R 2016-07-06 09:58:55 +05:30 committed by Jagan Teki
parent c8864d7209
commit 7c61686255
2 changed files with 24 additions and 0 deletions
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11
drivers/core/device.c
View File

@ -10,6 +10,7 @@
*/
#include <common.h>
#include <asm/io.h>
#include <fdtdec.h>
#include <fdt_support.h>
#include <malloc.h>
@ -697,6 +698,16 @@ void *dev_get_addr_ptr(struct udevice *dev)
return (void *)(uintptr_t)dev_get_addr_index(dev, 0);
}
void *dev_map_physmem(struct udevice *dev, unsigned long size)
{
fdt_addr_t addr = dev_get_addr(dev);
if (addr == FDT_ADDR_T_NONE)
return NULL;
return map_physmem(addr, size, MAP_NOCACHE);
}
bool device_has_children(struct udevice *dev)
{
return !list_empty(&dev->child_head);

13
include/dm/device.h
View File

@ -466,6 +466,19 @@ fdt_addr_t dev_get_addr(struct udevice *dev);
*/
void *dev_get_addr_ptr(struct udevice *dev);
/**
* dev_map_physmem() - Read device address from reg property of the
* device node and map the address into CPU address
* space.
*
* @dev: Pointer to device
* @size: size of the memory to map
*
* @return mapped address, or NULL if the device does not have reg
* property.
*/
void *dev_map_physmem(struct udevice *dev, unsigned long size);
/**
* dev_get_addr_index() - Get the indexed reg property of a device
*