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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/pci/hotplug/rpaphp_pci.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/pci/hotplug/rpaphp_pci.c')
-rw-r--r--drivers/pci/hotplug/rpaphp_pci.c117
1 files changed, 117 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/rpaphp_pci.c b/drivers/pci/hotplug/rpaphp_pci.c
new file mode 100644
index 000000000..630f77057
--- /dev/null
+++ b/drivers/pci/hotplug/rpaphp_pci.c
@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
+ * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
+ *
+ * All rights reserved.
+ *
+ * Send feedback to <lxie@us.ibm.com>
+ *
+ */
+#include <linux/of.h>
+#include <linux/pci.h>
+#include <linux/string.h>
+
+#include <asm/pci-bridge.h>
+#include <asm/rtas.h>
+#include <asm/machdep.h>
+
+#include "../pci.h" /* for pci_add_new_bus */
+#include "rpaphp.h"
+
+int rpaphp_get_sensor_state(struct slot *slot, int *state)
+{
+ int rc;
+ int setlevel;
+
+ rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
+
+ if (rc < 0) {
+ if (rc == -EFAULT || rc == -EEXIST) {
+ dbg("%s: slot must be power up to get sensor-state\n",
+ __func__);
+
+ /* some slots have to be powered up
+ * before get-sensor will succeed.
+ */
+ rc = rtas_set_power_level(slot->power_domain, POWER_ON,
+ &setlevel);
+ if (rc < 0) {
+ dbg("%s: power on slot[%s] failed rc=%d.\n",
+ __func__, slot->name, rc);
+ } else {
+ rc = rtas_get_sensor(DR_ENTITY_SENSE,
+ slot->index, state);
+ }
+ } else if (rc == -ENODEV)
+ info("%s: slot is unusable\n", __func__);
+ else
+ err("%s failed to get sensor state\n", __func__);
+ }
+ return rc;
+}
+
+/**
+ * rpaphp_enable_slot - record slot state, config pci device
+ * @slot: target &slot
+ *
+ * Initialize values in the slot structure to indicate if there is a pci card
+ * plugged into the slot. If the slot is not empty, run the pcibios routine
+ * to get pcibios stuff correctly set up.
+ */
+int rpaphp_enable_slot(struct slot *slot)
+{
+ int rc, level, state;
+ struct pci_bus *bus;
+
+ slot->state = EMPTY;
+
+ /* Find out if the power is turned on for the slot */
+ rc = rtas_get_power_level(slot->power_domain, &level);
+ if (rc)
+ return rc;
+
+ /* Figure out if there is an adapter in the slot */
+ rc = rpaphp_get_sensor_state(slot, &state);
+ if (rc)
+ return rc;
+
+ bus = pci_find_bus_by_node(slot->dn);
+ if (!bus) {
+ err("%s: no pci_bus for dn %pOF\n", __func__, slot->dn);
+ return -EINVAL;
+ }
+
+ slot->bus = bus;
+ slot->pci_devs = &bus->devices;
+
+ /* if there's an adapter in the slot, go add the pci devices */
+ if (state == PRESENT) {
+ slot->state = NOT_CONFIGURED;
+
+ /* non-empty slot has to have child */
+ if (!slot->dn->child) {
+ err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
+ __func__, slot->name);
+ return -EINVAL;
+ }
+
+ if (list_empty(&bus->devices)) {
+ pseries_eeh_init_edev_recursive(PCI_DN(slot->dn));
+ pci_hp_add_devices(bus);
+ }
+
+ if (!list_empty(&bus->devices)) {
+ slot->state = CONFIGURED;
+ }
+
+ if (rpaphp_debug) {
+ struct pci_dev *dev;
+ dbg("%s: pci_devs of slot[%pOF]\n", __func__, slot->dn);
+ list_for_each_entry(dev, &bus->devices, bus_list)
+ dbg("\t%s\n", pci_name(dev));
+ }
+ }
+
+ return 0;
+}