diff options
Diffstat (limited to 'drivers/pci/hotplug/pciehp_core.c')
| -rw-r--r-- | drivers/pci/hotplug/pciehp_core.c | 387 |
1 files changed, 387 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c new file mode 100644 index 000000000..07aa722bb --- /dev/null +++ b/drivers/pci/hotplug/pciehp_core.c @@ -0,0 +1,387 @@ +/* + * 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/slab.h> +#include <linux/types.h> +#include <linux/pci.h> +#include "pciehp.h" +#include <linux/interrupt.h> +#include <linux/time.h> + +/* Global variables */ +bool pciehp_debug; +bool pciehp_poll_mode; +int pciehp_poll_time; +static bool pciehp_force; + +#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_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 OSHP is missing"); + +#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 reset_slot (struct hotplug_slot *slot, int probe); + +/** + * 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__, hotplug_slot_name(hotplug_slot)); + + kfree(hotplug_slot->ops); + kfree(hotplug_slot->info); + kfree(hotplug_slot); +} + +static int init_slot(struct controller *ctrl) +{ + struct slot *slot = ctrl->slot; + struct hotplug_slot *hotplug = NULL; + struct hotplug_slot_info *info = NULL; + struct hotplug_slot_ops *ops = NULL; + char name[SLOT_NAME_SIZE]; + int retval = -ENOMEM; + + hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL); + if (!hotplug) + goto out; + + info = kzalloc(sizeof(*info), GFP_KERNEL); + if (!info) + goto out; + + /* Setup hotplug slot ops */ + ops = kzalloc(sizeof(*ops), GFP_KERNEL); + if (!ops) + goto out; + + ops->enable_slot = enable_slot; + ops->disable_slot = disable_slot; + ops->get_power_status = get_power_status; + ops->get_adapter_status = get_adapter_status; + ops->reset_slot = reset_slot; + if (MRL_SENS(ctrl)) + ops->get_latch_status = get_latch_status; + if (ATTN_LED(ctrl)) { + ops->get_attention_status = get_attention_status; + ops->set_attention_status = set_attention_status; + } + + /* register this slot with the hotplug pci core */ + hotplug->info = info; + hotplug->private = slot; + hotplug->release = &release_slot; + hotplug->ops = ops; + slot->hotplug_slot = hotplug; + snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl)); + + ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:00 sun=%x\n", + pci_domain_nr(ctrl->pcie->port->subordinate), + ctrl->pcie->port->subordinate->number, PSN(ctrl)); + retval = pci_hp_register(hotplug, + ctrl->pcie->port->subordinate, 0, name); + if (retval) + ctrl_err(ctrl, + "pci_hp_register failed with error %d\n", retval); +out: + if (retval) { + kfree(ops); + kfree(info); + kfree(hotplug); + } + return retval; +} + +static void cleanup_slot(struct controller *ctrl) +{ + pci_hp_deregister(ctrl->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; + + ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", + __func__, slot_name(slot)); + + pciehp_set_attention_status(slot, status); + return 0; +} + + +static int enable_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)); + + return pciehp_sysfs_enable_slot(slot); +} + + +static int disable_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)); + + return pciehp_sysfs_disable_slot(slot); +} + +static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) +{ + struct slot *slot = hotplug_slot->private; + + ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", + __func__, slot_name(slot)); + + pciehp_get_power_status(slot, value); + return 0; +} + +static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) +{ + struct slot *slot = hotplug_slot->private; + + ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", + __func__, slot_name(slot)); + + pciehp_get_attention_status(slot, value); + return 0; +} + +static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) +{ + struct slot *slot = hotplug_slot->private; + + ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", + __func__, slot_name(slot)); + + pciehp_get_latch_status(slot, value); + return 0; +} + +static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) +{ + struct slot *slot = hotplug_slot->private; + + ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", + __func__, slot_name(slot)); + + pciehp_get_adapter_status(slot, value); + return 0; +} + +static int reset_slot(struct hotplug_slot *hotplug_slot, int probe) +{ + struct slot *slot = hotplug_slot->private; + + ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", + __func__, slot_name(slot)); + + return pciehp_reset_slot(slot, probe); +} + +static int pciehp_probe(struct pcie_device *dev) +{ + int rc; + struct controller *ctrl; + struct slot *slot; + u8 occupied, poweron; + + if (pciehp_force) + dev_info(&dev->device, + "Bypassing BIOS check for pciehp use on %s\n", + pci_name(dev->port)); + else if (pciehp_acpi_slot_detection_check(dev->port)) + goto err_out_none; + + if (!dev->port->subordinate) { + /* Can happen if we run out of bus numbers during probe */ + dev_err(&dev->device, + "Hotplug bridge without secondary bus, ignoring\n"); + goto err_out_none; + } + + ctrl = pcie_init(dev); + if (!ctrl) { + dev_err(&dev->device, "Controller initialization failed\n"); + goto err_out_none; + } + set_service_data(dev, ctrl); + + /* Setup the slot information structures */ + rc = init_slot(ctrl); + if (rc) { + if (rc == -EBUSY) + ctrl_warn(ctrl, "Slot already registered by another hotplug driver\n"); + else + ctrl_err(ctrl, "Slot initialization failed\n"); + goto err_out_release_ctlr; + } + + /* Enable events after we have setup the data structures */ + rc = pcie_init_notification(ctrl); + if (rc) { + ctrl_err(ctrl, "Notification initialization failed\n"); + goto err_out_free_ctrl_slot; + } + + /* Check if slot is occupied */ + slot = ctrl->slot; + pciehp_get_adapter_status(slot, &occupied); + pciehp_get_power_status(slot, &poweron); + if (occupied && pciehp_force) { + mutex_lock(&slot->hotplug_lock); + pciehp_enable_slot(slot); + mutex_unlock(&slot->hotplug_lock); + } + /* If empty slot's power status is on, turn power off */ + if (!occupied && poweron && POWER_CTRL(ctrl)) + pciehp_power_off_slot(slot); + + return 0; + +err_out_free_ctrl_slot: + cleanup_slot(ctrl); +err_out_release_ctlr: + pciehp_release_ctrl(ctrl); +err_out_none: + return -ENODEV; +} + +static void pciehp_remove(struct pcie_device *dev) +{ + struct controller *ctrl = get_service_data(dev); + + cleanup_slot(ctrl); + pciehp_release_ctrl(ctrl); +} + +#ifdef CONFIG_PM +static int pciehp_suspend(struct pcie_device *dev) +{ + return 0; +} + +static int pciehp_resume(struct pcie_device *dev) +{ + struct controller *ctrl; + struct slot *slot; + u8 status; + + ctrl = get_service_data(dev); + + /* reinitialize the chipset's event detection logic */ + pcie_enable_notification(ctrl); + + slot = ctrl->slot; + + /* Check if slot is occupied */ + pciehp_get_adapter_status(slot, &status); + mutex_lock(&slot->hotplug_lock); + if (status) + pciehp_enable_slot(slot); + else + pciehp_disable_slot(slot); + mutex_unlock(&slot->hotplug_lock); + return 0; +} +#endif /* PM */ + +static struct pcie_port_service_driver hpdriver_portdrv = { + .name = PCIE_MODULE_NAME, + .port_type = PCIE_ANY_PORT, + .service = PCIE_PORT_SERVICE_HP, + + .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; + + pciehp_firmware_init(); + 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("Failure to register service\n"); + + 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); |