Signed-off-by: Alex Marginean <[email protected]>
---
drivers/pci/pci-uclass.c | 25 +++++++++++++++++++++++++
include/pci.h | 11 +++++++++++
2 files changed, 36 insertions(+)
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index 3204f156c3..12b171f9f2 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -1495,6 +1495,31 @@ int dm_pci_find_ext_capability(struct udevice *dev, int
cap)
return dm_pci_find_next_ext_capability(dev, 0, cap);
}
+int dm_pci_flr(struct udevice *dev)
+{
+ int pcie_off;
+ u32 cap;
+ u16 cmd;
+
+ /* look for PCI Express Capability */
+ pcie_off = dm_pci_find_capability(dev, PCI_CAP_ID_EXP);
+ if (!pcie_off)
+ return -ENOENT;
+
+ /* check FLR capability */
+ dm_pci_read_config32(dev, pcie_off + 4, &cap);
+ if (!(cap & PCI_X_CAP_FLR))
+ return -ENOENT;
+
+ dm_pci_read_config16(dev, pcie_off + 8, &cmd);
+ dm_pci_write_config16(dev, pcie_off + 8, cmd | PCI_X_CMD_FLR);
+
+ /* wait 100ms, per PCI spec */
+ mdelay(100);
+
+ return 0;
+}
+
UCLASS_DRIVER(pci) = {
.id = UCLASS_PCI,
.name = "pci",
diff --git a/include/pci.h b/include/pci.h
index e1528bb257..c93e06dfb1 100644
--- a/include/pci.h
+++ b/include/pci.h
@@ -384,11 +384,14 @@
/* PCI-X registers */
+#define PCI_X_CAP_FLR 0x10000000 /* Function Level Reset capability */
+
#define PCI_X_CMD_DPERR_E 0x0001 /* Data Parity Error Recovery Enable */
#define PCI_X_CMD_ERO 0x0002 /* Enable Relaxed Ordering */
#define PCI_X_CMD_MAX_READ 0x0000 /* Max Memory Read Byte Count */
#define PCI_X_CMD_MAX_SPLIT 0x0030 /* Max Outstanding Split Transactions
*/
#define PCI_X_CMD_VERSION(x) (((x) >> 12) & 3) /* Version */
+#define PCI_X_CMD_FLR 0x8000 /* EP Function Level Reset */
/* Slot Identification */
@@ -1411,6 +1414,14 @@ 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) \
--
2.17.1
_______________________________________________
U-Boot mailing list
[email protected]
https://lists.denx.de/listinfo/u-boot
