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path: root/drivers/pci/hotplug/shpchp_core.c
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Diffstat (limited to 'drivers/pci/hotplug/shpchp_core.c')
-rw-r--r--drivers/pci/hotplug/shpchp_core.c366
1 files changed, 366 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/shpchp_core.c b/drivers/pci/hotplug/shpchp_core.c
new file mode 100644
index 000000000..97cee23f3
--- /dev/null
+++ b/drivers/pci/hotplug/shpchp_core.c
@@ -0,0 +1,366 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Standard Hot Plug Controller Driver
+ *
+ * Copyright (C) 1995,2001 Compaq Computer Corporation
+ * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
+ * Copyright (C) 2001 IBM Corp.
+ * Copyright (C) 2003-2004 Intel Corporation
+ *
+ * All rights reserved.
+ *
+ * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include "shpchp.h"
+
+/* Global variables */
+bool shpchp_debug;
+bool shpchp_poll_mode;
+int shpchp_poll_time;
+
+#define DRIVER_VERSION "0.4"
+#define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
+#define DRIVER_DESC "Standard Hot Plug PCI Controller Driver"
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+module_param(shpchp_debug, bool, 0644);
+module_param(shpchp_poll_mode, bool, 0644);
+module_param(shpchp_poll_time, int, 0644);
+MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
+MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
+MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
+
+#define SHPC_MODULE_NAME "shpchp"
+
+static int set_attention_status(struct hotplug_slot *slot, u8 value);
+static int enable_slot(struct hotplug_slot *slot);
+static int disable_slot(struct hotplug_slot *slot);
+static int get_power_status(struct hotplug_slot *slot, u8 *value);
+static int get_attention_status(struct hotplug_slot *slot, u8 *value);
+static int get_latch_status(struct hotplug_slot *slot, u8 *value);
+static int get_adapter_status(struct hotplug_slot *slot, u8 *value);
+
+static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
+ .set_attention_status = set_attention_status,
+ .enable_slot = enable_slot,
+ .disable_slot = disable_slot,
+ .get_power_status = get_power_status,
+ .get_attention_status = get_attention_status,
+ .get_latch_status = get_latch_status,
+ .get_adapter_status = get_adapter_status,
+};
+
+static int init_slots(struct controller *ctrl)
+{
+ struct slot *slot;
+ struct hotplug_slot *hotplug_slot;
+ struct hotplug_slot_info *info;
+ char name[SLOT_NAME_SIZE];
+ int retval;
+ int i;
+
+ for (i = 0; i < ctrl->num_slots; i++) {
+ slot = kzalloc(sizeof(*slot), GFP_KERNEL);
+ if (!slot) {
+ retval = -ENOMEM;
+ goto error;
+ }
+
+ hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
+ if (!hotplug_slot) {
+ retval = -ENOMEM;
+ goto error_slot;
+ }
+ slot->hotplug_slot = hotplug_slot;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info) {
+ retval = -ENOMEM;
+ goto error_hpslot;
+ }
+ hotplug_slot->info = info;
+
+ slot->hp_slot = i;
+ slot->ctrl = ctrl;
+ slot->bus = ctrl->pci_dev->subordinate->number;
+ slot->device = ctrl->slot_device_offset + i;
+ slot->hpc_ops = ctrl->hpc_ops;
+ slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
+
+ slot->wq = alloc_workqueue("shpchp-%d", 0, 0, slot->number);
+ if (!slot->wq) {
+ retval = -ENOMEM;
+ goto error_info;
+ }
+
+ mutex_init(&slot->lock);
+ INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
+
+ /* register this slot with the hotplug pci core */
+ hotplug_slot->private = slot;
+ snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
+ hotplug_slot->ops = &shpchp_hotplug_slot_ops;
+
+ ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x hp_slot=%x sun=%x slot_device_offset=%x\n",
+ pci_domain_nr(ctrl->pci_dev->subordinate),
+ slot->bus, slot->device, slot->hp_slot, slot->number,
+ ctrl->slot_device_offset);
+ retval = pci_hp_register(slot->hotplug_slot,
+ ctrl->pci_dev->subordinate, slot->device, name);
+ if (retval) {
+ ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
+ retval);
+ goto error_slotwq;
+ }
+
+ get_power_status(hotplug_slot, &info->power_status);
+ get_attention_status(hotplug_slot, &info->attention_status);
+ get_latch_status(hotplug_slot, &info->latch_status);
+ get_adapter_status(hotplug_slot, &info->adapter_status);
+
+ list_add(&slot->slot_list, &ctrl->slot_list);
+ }
+
+ return 0;
+error_slotwq:
+ destroy_workqueue(slot->wq);
+error_info:
+ kfree(info);
+error_hpslot:
+ kfree(hotplug_slot);
+error_slot:
+ kfree(slot);
+error:
+ return retval;
+}
+
+void cleanup_slots(struct controller *ctrl)
+{
+ struct slot *slot, *next;
+
+ list_for_each_entry_safe(slot, next, &ctrl->slot_list, slot_list) {
+ list_del(&slot->slot_list);
+ cancel_delayed_work(&slot->work);
+ destroy_workqueue(slot->wq);
+ pci_hp_deregister(slot->hotplug_slot);
+ kfree(slot->hotplug_slot->info);
+ kfree(slot->hotplug_slot);
+ kfree(slot);
+ }
+}
+
+/*
+ * set_attention_status - Turns the Amber LED for a slot on, off or blink
+ */
+static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
+{
+ struct slot *slot = get_slot(hotplug_slot);
+
+ ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
+ __func__, slot_name(slot));
+
+ hotplug_slot->info->attention_status = status;
+ slot->hpc_ops->set_attention_status(slot, status);
+
+ return 0;
+}
+
+static int enable_slot(struct hotplug_slot *hotplug_slot)
+{
+ struct slot *slot = get_slot(hotplug_slot);
+
+ ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
+ __func__, slot_name(slot));
+
+ return shpchp_sysfs_enable_slot(slot);
+}
+
+static int disable_slot(struct hotplug_slot *hotplug_slot)
+{
+ struct slot *slot = get_slot(hotplug_slot);
+
+ ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
+ __func__, slot_name(slot));
+
+ return shpchp_sysfs_disable_slot(slot);
+}
+
+static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+ struct slot *slot = get_slot(hotplug_slot);
+ int retval;
+
+ ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
+ __func__, slot_name(slot));
+
+ retval = slot->hpc_ops->get_power_status(slot, value);
+ if (retval < 0)
+ *value = hotplug_slot->info->power_status;
+
+ return 0;
+}
+
+static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+ struct slot *slot = get_slot(hotplug_slot);
+ int retval;
+
+ ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
+ __func__, slot_name(slot));
+
+ retval = slot->hpc_ops->get_attention_status(slot, value);
+ if (retval < 0)
+ *value = hotplug_slot->info->attention_status;
+
+ return 0;
+}
+
+static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+ struct slot *slot = get_slot(hotplug_slot);
+ int retval;
+
+ ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
+ __func__, slot_name(slot));
+
+ retval = slot->hpc_ops->get_latch_status(slot, value);
+ if (retval < 0)
+ *value = hotplug_slot->info->latch_status;
+
+ return 0;
+}
+
+static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+ struct slot *slot = get_slot(hotplug_slot);
+ int retval;
+
+ ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
+ __func__, slot_name(slot));
+
+ retval = slot->hpc_ops->get_adapter_status(slot, value);
+ if (retval < 0)
+ *value = hotplug_slot->info->adapter_status;
+
+ return 0;
+}
+
+static bool shpc_capable(struct pci_dev *bridge)
+{
+ /*
+ * It is assumed that AMD GOLAM chips support SHPC but they do not
+ * have SHPC capability.
+ */
+ if (bridge->vendor == PCI_VENDOR_ID_AMD &&
+ bridge->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
+ return true;
+
+ if (pci_find_capability(bridge, PCI_CAP_ID_SHPC))
+ return true;
+
+ return false;
+}
+
+static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+ int rc;
+ struct controller *ctrl;
+
+ if (!shpc_capable(pdev))
+ return -ENODEV;
+
+ if (acpi_get_hp_hw_control_from_firmware(pdev))
+ return -ENODEV;
+
+ ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
+ if (!ctrl)
+ goto err_out_none;
+
+ INIT_LIST_HEAD(&ctrl->slot_list);
+
+ rc = shpc_init(ctrl, pdev);
+ if (rc) {
+ ctrl_dbg(ctrl, "Controller initialization failed\n");
+ goto err_out_free_ctrl;
+ }
+
+ pci_set_drvdata(pdev, ctrl);
+
+ /* Setup the slot information structures */
+ rc = init_slots(ctrl);
+ if (rc) {
+ ctrl_err(ctrl, "Slot initialization failed\n");
+ goto err_out_release_ctlr;
+ }
+
+ rc = shpchp_create_ctrl_files(ctrl);
+ if (rc)
+ goto err_cleanup_slots;
+
+ pdev->shpc_managed = 1;
+ return 0;
+
+err_cleanup_slots:
+ cleanup_slots(ctrl);
+err_out_release_ctlr:
+ ctrl->hpc_ops->release_ctlr(ctrl);
+err_out_free_ctrl:
+ kfree(ctrl);
+err_out_none:
+ return -ENODEV;
+}
+
+static void shpc_remove(struct pci_dev *dev)
+{
+ struct controller *ctrl = pci_get_drvdata(dev);
+
+ dev->shpc_managed = 0;
+ shpchp_remove_ctrl_files(ctrl);
+ ctrl->hpc_ops->release_ctlr(ctrl);
+ kfree(ctrl);
+}
+
+static const struct pci_device_id shpcd_pci_tbl[] = {
+ {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
+ { /* end: all zeroes */ }
+};
+MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
+
+static struct pci_driver shpc_driver = {
+ .name = SHPC_MODULE_NAME,
+ .id_table = shpcd_pci_tbl,
+ .probe = shpc_probe,
+ .remove = shpc_remove,
+};
+
+static int __init shpcd_init(void)
+{
+ int retval;
+
+ retval = pci_register_driver(&shpc_driver);
+ dbg("%s: pci_register_driver = %d\n", __func__, retval);
+ info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
+
+ return retval;
+}
+
+static void __exit shpcd_cleanup(void)
+{
+ dbg("unload_shpchpd()\n");
+ pci_unregister_driver(&shpc_driver);
+ info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
+}
+
+module_init(shpcd_init);
+module_exit(shpcd_cleanup);