| /* |
| * PCI Express 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. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or (at |
| * your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| * NON INFRINGEMENT. See the GNU General Public License for more |
| * details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| * |
| * 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/pci.h> |
| #include "pciehp.h" |
| #include <linux/interrupt.h> |
| #include <linux/time.h> |
| |
| /* Global variables */ |
| int pciehp_debug; |
| int pciehp_poll_mode; |
| int pciehp_poll_time; |
| int pciehp_force; |
| int pciehp_slot_with_bus; |
| struct workqueue_struct *pciehp_wq; |
| |
| #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 "PCI Express Hot Plug Controller Driver" |
| |
| MODULE_AUTHOR(DRIVER_AUTHOR); |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_LICENSE("GPL"); |
| |
| module_param(pciehp_debug, bool, 0644); |
| module_param(pciehp_poll_mode, bool, 0644); |
| module_param(pciehp_poll_time, int, 0644); |
| module_param(pciehp_force, bool, 0644); |
| module_param(pciehp_slot_with_bus, bool, 0644); |
| MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not"); |
| MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not"); |
| MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds"); |
| MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing"); |
| MODULE_PARM_DESC(pciehp_slot_with_bus, "Use bus number in the slot name"); |
| |
| #define PCIE_MODULE_NAME "pciehp" |
| |
| 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 int get_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value); |
| static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value); |
| |
| static struct hotplug_slot_ops pciehp_hotplug_slot_ops = { |
| .owner = THIS_MODULE, |
| .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, |
| .get_max_bus_speed = get_max_bus_speed, |
| .get_cur_bus_speed = get_cur_bus_speed, |
| }; |
| |
| /* |
| * Check the status of the Electro Mechanical Interlock (EMI) |
| */ |
| static int get_lock_status(struct hotplug_slot *hotplug_slot, u8 *value) |
| { |
| struct slot *slot = hotplug_slot->private; |
| return (slot->hpc_ops->get_emi_status(slot, value)); |
| } |
| |
| /* |
| * sysfs interface for the Electro Mechanical Interlock (EMI) |
| * 1 == locked, 0 == unlocked |
| */ |
| static ssize_t lock_read_file(struct hotplug_slot *slot, char *buf) |
| { |
| int retval; |
| u8 value; |
| |
| retval = get_lock_status(slot, &value); |
| if (retval) |
| goto lock_read_exit; |
| retval = sprintf (buf, "%d\n", value); |
| |
| lock_read_exit: |
| return retval; |
| } |
| |
| /* |
| * Change the status of the Electro Mechanical Interlock (EMI) |
| * This is a toggle - in addition there must be at least 1 second |
| * in between toggles. |
| */ |
| static int set_lock_status(struct hotplug_slot *hotplug_slot, u8 status) |
| { |
| struct slot *slot = hotplug_slot->private; |
| int retval; |
| u8 value; |
| |
| mutex_lock(&slot->ctrl->crit_sect); |
| |
| /* has it been >1 sec since our last toggle? */ |
| if ((get_seconds() - slot->last_emi_toggle) < 1) |
| return -EINVAL; |
| |
| /* see what our current state is */ |
| retval = get_lock_status(hotplug_slot, &value); |
| if (retval || (value == status)) |
| goto set_lock_exit; |
| |
| slot->hpc_ops->toggle_emi(slot); |
| set_lock_exit: |
| mutex_unlock(&slot->ctrl->crit_sect); |
| return 0; |
| } |
| |
| /* |
| * sysfs interface which allows the user to toggle the Electro Mechanical |
| * Interlock. Valid values are either 0 or 1. 0 == unlock, 1 == lock |
| */ |
| static ssize_t lock_write_file(struct hotplug_slot *slot, const char *buf, |
| size_t count) |
| { |
| unsigned long llock; |
| u8 lock; |
| int retval = 0; |
| |
| llock = simple_strtoul(buf, NULL, 10); |
| lock = (u8)(llock & 0xff); |
| |
| switch (lock) { |
| case 0: |
| case 1: |
| retval = set_lock_status(slot, lock); |
| break; |
| default: |
| err ("%d is an invalid lock value\n", lock); |
| retval = -EINVAL; |
| } |
| if (retval) |
| return retval; |
| return count; |
| } |
| |
| static struct hotplug_slot_attribute hotplug_slot_attr_lock = { |
| .attr = {.name = "lock", .mode = S_IFREG | S_IRUGO | S_IWUSR}, |
| .show = lock_read_file, |
| .store = lock_write_file |
| }; |
| |
| /** |
| * release_slot - free up the memory used by a slot |
| * @hotplug_slot: slot to free |
| */ |
| static void release_slot(struct hotplug_slot *hotplug_slot) |
| { |
| dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
| |
| kfree(hotplug_slot->info); |
| kfree(hotplug_slot); |
| } |
| |
| static int init_slots(struct controller *ctrl) |
| { |
| struct slot *slot; |
| struct hotplug_slot *hotplug_slot; |
| struct hotplug_slot_info *info; |
| int retval = -ENOMEM; |
| |
| list_for_each_entry(slot, &ctrl->slot_list, slot_list) { |
| hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL); |
| if (!hotplug_slot) |
| goto error; |
| |
| info = kzalloc(sizeof(*info), GFP_KERNEL); |
| if (!info) |
| goto error_hpslot; |
| |
| /* register this slot with the hotplug pci core */ |
| hotplug_slot->info = info; |
| hotplug_slot->name = slot->name; |
| hotplug_slot->private = slot; |
| hotplug_slot->release = &release_slot; |
| hotplug_slot->ops = &pciehp_hotplug_slot_ops; |
| 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); |
| slot->hotplug_slot = hotplug_slot; |
| |
| dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x " |
| "slot_device_offset=%x\n", slot->bus, slot->device, |
| slot->hp_slot, slot->number, ctrl->slot_device_offset); |
| retval = pci_hp_register(hotplug_slot, |
| ctrl->pci_dev->subordinate, |
| slot->device); |
| if (retval) { |
| err("pci_hp_register failed with error %d\n", retval); |
| if (retval == -EEXIST) |
| err("Failed to register slot because of name " |
| "collision. Try \'pciehp_slot_with_bus\' " |
| "module option.\n"); |
| goto error_info; |
| } |
| /* create additional sysfs entries */ |
| if (EMI(ctrl)) { |
| retval = sysfs_create_file(&hotplug_slot->pci_slot->kobj, |
| &hotplug_slot_attr_lock.attr); |
| if (retval) { |
| pci_hp_deregister(hotplug_slot); |
| err("cannot create additional sysfs entries\n"); |
| goto error_info; |
| } |
| } |
| } |
| |
| return 0; |
| error_info: |
| kfree(info); |
| error_hpslot: |
| kfree(hotplug_slot); |
| error: |
| return retval; |
| } |
| |
| static void cleanup_slots(struct controller *ctrl) |
| { |
| struct slot *slot; |
| |
| list_for_each_entry(slot, &ctrl->slot_list, slot_list) { |
| if (EMI(ctrl)) |
| sysfs_remove_file(&slot->hotplug_slot->pci_slot->kobj, |
| &hotplug_slot_attr_lock.attr); |
| 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 = hotplug_slot->private; |
| |
| dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
| |
| hotplug_slot->info->attention_status = status; |
| |
| if (ATTN_LED(slot->ctrl)) |
| slot->hpc_ops->set_attention_status(slot, status); |
| |
| return 0; |
| } |
| |
| |
| static int enable_slot(struct hotplug_slot *hotplug_slot) |
| { |
| struct slot *slot = hotplug_slot->private; |
| |
| dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
| |
| return pciehp_sysfs_enable_slot(slot); |
| } |
| |
| |
| static int disable_slot(struct hotplug_slot *hotplug_slot) |
| { |
| struct slot *slot = hotplug_slot->private; |
| |
| dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
| |
| return pciehp_sysfs_disable_slot(slot); |
| } |
| |
| static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) |
| { |
| struct slot *slot = hotplug_slot->private; |
| int retval; |
| |
| dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
| |
| 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 = hotplug_slot->private; |
| int retval; |
| |
| dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
| |
| 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 = hotplug_slot->private; |
| int retval; |
| |
| dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
| |
| 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 = hotplug_slot->private; |
| int retval; |
| |
| dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
| |
| retval = slot->hpc_ops->get_adapter_status(slot, value); |
| if (retval < 0) |
| *value = hotplug_slot->info->adapter_status; |
| |
| return 0; |
| } |
| |
| static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, |
| enum pci_bus_speed *value) |
| { |
| struct slot *slot = hotplug_slot->private; |
| int retval; |
| |
| dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
| |
| retval = slot->hpc_ops->get_max_bus_speed(slot, value); |
| if (retval < 0) |
| *value = PCI_SPEED_UNKNOWN; |
| |
| return 0; |
| } |
| |
| static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) |
| { |
| struct slot *slot = hotplug_slot->private; |
| int retval; |
| |
| dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
| |
| retval = slot->hpc_ops->get_cur_bus_speed(slot, value); |
| if (retval < 0) |
| *value = PCI_SPEED_UNKNOWN; |
| |
| return 0; |
| } |
| |
| static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_id *id) |
| { |
| int rc; |
| struct controller *ctrl; |
| struct slot *t_slot; |
| u8 value; |
| struct pci_dev *pdev = dev->port; |
| |
| if (pciehp_force) |
| dbg("Bypassing BIOS check for pciehp use on %s\n", |
| pci_name(pdev)); |
| else if (pciehp_get_hp_hw_control_from_firmware(pdev)) |
| goto err_out_none; |
| |
| ctrl = pcie_init(dev); |
| if (!ctrl) { |
| dbg("%s: controller initialization failed\n", PCIE_MODULE_NAME); |
| goto err_out_none; |
| } |
| set_service_data(dev, ctrl); |
| |
| /* Setup the slot information structures */ |
| rc = init_slots(ctrl); |
| if (rc) { |
| if (rc == -EBUSY) |
| warn("%s: slot already registered by another " |
| "hotplug driver\n", PCIE_MODULE_NAME); |
| else |
| err("%s: slot initialization failed\n", |
| PCIE_MODULE_NAME); |
| goto err_out_release_ctlr; |
| } |
| |
| t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset); |
| |
| t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */ |
| if (value && pciehp_force) { |
| rc = pciehp_enable_slot(t_slot); |
| if (rc) /* -ENODEV: shouldn't happen, but deal with it */ |
| value = 0; |
| } |
| if ((POWER_CTRL(ctrl)) && !value) { |
| rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/ |
| if (rc) |
| goto err_out_free_ctrl_slot; |
| } |
| |
| return 0; |
| |
| err_out_free_ctrl_slot: |
| cleanup_slots(ctrl); |
| err_out_release_ctlr: |
| ctrl->hpc_ops->release_ctlr(ctrl); |
| err_out_none: |
| return -ENODEV; |
| } |
| |
| static void pciehp_remove (struct pcie_device *dev) |
| { |
| struct controller *ctrl = get_service_data(dev); |
| |
| cleanup_slots(ctrl); |
| ctrl->hpc_ops->release_ctlr(ctrl); |
| } |
| |
| #ifdef CONFIG_PM |
| static int pciehp_suspend (struct pcie_device *dev, pm_message_t state) |
| { |
| printk("%s ENTRY\n", __func__); |
| return 0; |
| } |
| |
| static int pciehp_resume (struct pcie_device *dev) |
| { |
| printk("%s ENTRY\n", __func__); |
| if (pciehp_force) { |
| struct controller *ctrl = get_service_data(dev); |
| struct slot *t_slot; |
| u8 status; |
| |
| /* reinitialize the chipset's event detection logic */ |
| pcie_enable_notification(ctrl); |
| |
| t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset); |
| |
| /* Check if slot is occupied */ |
| t_slot->hpc_ops->get_adapter_status(t_slot, &status); |
| if (status) |
| pciehp_enable_slot(t_slot); |
| else |
| pciehp_disable_slot(t_slot); |
| } |
| return 0; |
| } |
| #endif |
| |
| static struct pcie_port_service_id port_pci_ids[] = { { |
| .vendor = PCI_ANY_ID, |
| .device = PCI_ANY_ID, |
| .port_type = PCIE_ANY_PORT, |
| .service_type = PCIE_PORT_SERVICE_HP, |
| .driver_data = 0, |
| }, { /* end: all zeroes */ } |
| }; |
| static const char device_name[] = "hpdriver"; |
| |
| static struct pcie_port_service_driver hpdriver_portdrv = { |
| .name = (char *)device_name, |
| .id_table = &port_pci_ids[0], |
| |
| .probe = pciehp_probe, |
| .remove = pciehp_remove, |
| |
| #ifdef CONFIG_PM |
| .suspend = pciehp_suspend, |
| .resume = pciehp_resume, |
| #endif /* PM */ |
| }; |
| |
| static int __init pcied_init(void) |
| { |
| int retval = 0; |
| |
| retval = pcie_port_service_register(&hpdriver_portdrv); |
| dbg("pcie_port_service_register = %d\n", retval); |
| info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); |
| if (retval) |
| dbg("%s: Failure to register service\n", __func__); |
| return retval; |
| } |
| |
| static void __exit pcied_cleanup(void) |
| { |
| dbg("unload_pciehpd()\n"); |
| pcie_port_service_unregister(&hpdriver_portdrv); |
| info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); |
| } |
| |
| module_init(pcied_init); |
| module_exit(pcied_cleanup); |