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dm: ahci: Add a driver for SCSI on AHCI

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Some AHCI drivers use SCSI under the hood. Rather than making the AHCI
driver be in the SCSI uclass it makes sense to have the AHCI device create
a SCSI device as a child. That way we can handle any AHCI-specific
operations rather than trying to pretend tha the device is just SCSI.

To handle this we need to provide a way for AHCI drivers to bind a SCSI
device as its child, and probe it. Add functions for this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
2017-06-14 21:28:46 -06:00
parent 5c56176318
commit 681357ffd9
2 changed files with 79 additions and 0 deletions
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22
include/ahci.h
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@@ -200,4 +200,26 @@ int achi_start_ports_dm(struct udevice *dev);
*/
int ahci_init_dm(struct udevice *dev, void __iomem *base);
/**
* ahci_bind_scsi() - bind a new SCSI bus as a child
*
* Note that the SCSI bus device will itself bind block devices
*
* @ahci_dev: AHCI parent device
* @devp: Returns new SCSI bus device
* @return 0 if OK, -ve on error
*/
int ahci_bind_scsi(struct udevice *ahci_dev, struct udevice **devp);
/**
* ahci_probe_scsi() - probe and scan the attached SCSI bus
*
* Note that the SCSI device will itself bind block devices for any storage
* devices it finds.
*
* @ahci_dev: AHCI parent device
* @return 0 if OK, -ve on error
*/
int ahci_probe_scsi(struct udevice *ahci_dev);
#endif