core/pcie-slots: Make dynamic slot creation generic

astbmc has some code to handle devices that are behind a "slot" on a
riser card that can't be added to the static slot tables for a system.
We probably want to use this code outside the slot table handling so
move it somewhere generic and rework it so slot table specifics aren't
buried inside it.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/core/pcie-slot.c b/core/pcie-slot.c
index 1b7e24c..77e356c 100644
--- a/core/pcie-slot.c
+++ b/core/pcie-slot.c
@@ -528,5 +528,56 @@ struct pci_slot *pcie_slot_create(struct phb *phb, struct pci_device *pd)
 	slot->ops.hreset                = pcie_slot_sm_hreset;
 	slot->ops.freset                = pcie_slot_sm_freset;
 
+	slot->wired_lanes    = PCI_SLOT_WIRED_LANES_UNKNOWN;
+	slot->connector_type = PCI_SLOT_CONNECTOR_PCIE_NS;
+	slot->card_desc      = PCI_SLOT_DESC_NON_STANDARD;
+	slot->card_mech      = PCI_SLOT_MECH_NONE;
+	slot->power_led_ctl  = PCI_SLOT_PWR_LED_CTL_NONE;
+	slot->attn_led_ctl   = PCI_SLOT_ATTN_LED_CTL_NONE;
+
+	return slot;
+}
+
+/* FIXME: this is kind of insane */
+struct pci_slot *pcie_slot_create_dynamic(struct phb *phb,
+		struct pci_device *pd)
+{
+	uint32_t ecap, val;
+	struct pci_slot *slot;
+
+	if (!phb || !pd || pd->slot)
+		return NULL;
+
+	/* Try to create slot whose details aren't provided by platform.
+	 * We only care the downstream ports of PCIe switch that connects
+	 * to root port.
+	 */
+	if (pd->dev_type != PCIE_TYPE_SWITCH_DNPORT ||
+	    !pd->parent || !pd->parent->parent ||
+	    pd->parent->parent->parent)
+		return NULL;
+
+	ecap = pci_cap(pd, PCI_CFG_CAP_ID_EXP, false);
+	pci_cfg_read32(phb, pd->bdfn, ecap + PCICAP_EXP_SLOTCAP, &val);
+	if (!(val & PCICAP_EXP_SLOTCAP_HPLUG_CAP))
+		return NULL;
+
+	slot = pcie_slot_create(phb, pd);
+
+	/* On superMicro's "p8dnu" platform, we create dynamic PCI slots
+	 * for all downstream ports of PEX9733 that is connected to PHB
+	 * direct slot. The power supply to the PCI slot is lost after
+	 * PCI adapter is removed from it. The power supply can't be
+	 * turned on when the slot is in empty state. The power supply
+	 * isn't turned on automatically when inserting PCI adapter to
+	 * the slot at later point. We set a flag to the slot here, to
+	 * turn on the power supply in (suprise or managed) hot-add path.
+	 *
+	 * We have same issue with PEX8718 as above on "p8dnu" platform.
+	 */
+	if (dt_node_is_compatible(dt_root, "supermicro,p8dnu") && slot->pd &&
+	    (slot->pd->vdid == 0x973310b5 || slot->pd->vdid == 0x871810b5))
+		pci_slot_add_flags(slot, PCI_SLOT_FLAG_FORCE_POWERON);
+
 	return slot;
 }