b03799b0cb
The shpchp driver registers for all PCI bridge devices. Its probe method
should fail if either (1) the bridge doesn't have an SHPC or (2) the OS
isn't allowed to use it (the platform firmware may be operating the SHPC
itself).
Separate these two tests into:
- A new shpc_capable() that looks for the SHPC hardware and is applicable
on all systems (ACPI and non-ACPI), and
- A simplified acpi_get_hp_hw_control_from_firmware() that we call only
when we already know an SHPC exists and there may be ACPI methods to
either request permission to use it (_OSC) or transfer control to the
OS (OSHP).
acpi_get_hp_hw_control_from_firmware() is implemented when CONFIG_ACPI=y,
but does nothing if the current platform doesn't support ACPI.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
381 lines
9.4 KiB
C
381 lines
9.4 KiB
C
// 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,
|
|
};
|
|
|
|
/**
|
|
* release_slot - free up the memory used by a slot
|
|
* @hotplug_slot: slot to free
|
|
*/
|
|
static void release_slot(struct hotplug_slot *hotplug_slot)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
kfree(slot->hotplug_slot->info);
|
|
kfree(slot->hotplug_slot);
|
|
kfree(slot);
|
|
}
|
|
|
|
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;
|
|
hotplug_slot->release = &release_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);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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);
|