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dm: core: Add DM_FLAG_OS_PREPARE flag

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This new flag can be added to DM device drivers, which need to do some
final configuration before U-Boot exits and the OS (e.g. Linux) is
started. The remove functions of those drivers will get called at
this stage to do these last-stage configuration steps.

Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Cc: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Stefan Roese 2017-04-24 09:48:02 +02:00 • committed by Bin Meng
parent e98856fcff
commit 426f99fa98
2 changed files with 21 additions and 6 deletions
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16
drivers/core/device-remove.c
View file

@ -152,6 +152,15 @@ void device_free(struct udevice *dev)
devres_release_probe(dev);
}
static bool flags_remove(uint flags, uint drv_flags)
{
if ((flags & DM_REMOVE_NORMAL) ||
(flags & (drv_flags & (DM_FLAG_ACTIVE_DMA | DM_FLAG_OS_PREPARE))))
return true;
return false;
}
int device_remove(struct udevice *dev, uint flags)
{
const struct driver *drv;
@ -178,9 +187,7 @@ int device_remove(struct udevice *dev, uint flags)
* Remove the device if called with the "normal" remove flag set,
* or if the remove flag matches any of the drivers remove flags
*/
if (drv->remove &&
((flags & DM_REMOVE_NORMAL) ||
(flags & (drv->flags & DM_FLAG_ACTIVE_DMA)))) {
if (drv->remove && flags_remove(flags, drv->flags)) {
ret = drv->remove(dev);
if (ret)
goto err_remove;
@ -194,8 +201,7 @@ int device_remove(struct udevice *dev, uint flags)
}
}
if ((flags & DM_REMOVE_NORMAL) ||
(flags & (drv->flags & DM_FLAG_ACTIVE_DMA))) {
if (flags_remove(flags, drv->flags)) {
device_free(dev);
dev->seq = -1;

11
include/dm/device.h
View file

@ -54,6 +54,12 @@ struct driver_info;
*/
#define DM_FLAG_ACTIVE_DMA (1 << 9)
/*
* Call driver remove function to do some final configuration, before
* U-Boot exits and the OS is started
*/
#define DM_FLAG_OS_PREPARE (1 << 10)
/*
* One or multiple of these flags are passed to device_remove() so that
* a selective device removal as specified by the remove-stage and the
@ -66,10 +72,13 @@ enum {
/* Remove devices with active DMA */
DM_REMOVE_ACTIVE_DMA = DM_FLAG_ACTIVE_DMA,
/* Remove devices which need some final OS preparation steps */
DM_REMOVE_OS_PREPARE = DM_FLAG_OS_PREPARE,
/* Add more use cases here */
/* Remove devices with any active flag */
DM_REMOVE_ACTIVE_ALL = DM_REMOVE_ACTIVE_DMA,
DM_REMOVE_ACTIVE_ALL = DM_REMOVE_ACTIVE_DMA | DM_REMOVE_OS_PREPARE,
};
/**