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drivers: pci: add API to issue FLR on a PCI function if supported

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Adds dm_pci_flr API that issues a Function Level reset on a PCI-e function,
if FLR is supported.

Signed-off-by: Alex Marginean <alexm.osslist@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Alex Marginean
2019-06-07 11:24:25 +03:00
committed by Simon Glass
parent 21ebbafde8
commit b8e1f8270c
2 changed files with 38 additions and 0 deletions
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14
include/pci.h
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@@ -466,6 +466,12 @@
#define PCI_EA_IS_64 0x00000002 /* 64-bit field flag */
#define PCI_EA_FIELD_MASK 0xfffffffc /* For Base & Max Offset */
/* PCI Express capabilities */
#define PCI_EXP_DEVCAP 4 /* Device capabilities */
#define PCI_EXP_DEVCAP_FLR 0x10000000 /* Function Level Reset */
#define PCI_EXP_DEVCTL 8 /* Device Control */
#define PCI_EXP_DEVCTL_BCR_FLR 0x8000 /* Bridge Configuration Retry / FLR */
/* Include the ID list */
#include <pci_ids.h>
@@ -1426,6 +1432,14 @@ int dm_pci_find_next_ext_capability(struct udevice *dev, int start, int cap);
*/
int dm_pci_find_ext_capability(struct udevice *dev, int cap);
/**
* dm_pci_flr() - Perform FLR if the device suppoorts it
*
* @dev: PCI device to reset
* @return: 0 if OK, -ENOENT if FLR is not supported by dev
*/
int dm_pci_flr(struct udevice *dev);
#define dm_pci_virt_to_bus(dev, addr, flags) \
dm_pci_phys_to_bus(dev, (virt_to_phys(addr)), (flags))
#define dm_pci_bus_to_virt(dev, addr, flags, len, map_flags) \