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linux/drivers/pci/hotplug/shpchp_core.c

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/*
* 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.
*
* 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>, <dely.l.sy@intel.com>
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include "shpchp.h"
#include "shpchprm.h"
/* Global variables */
int shpchp_debug;
int shpchp_poll_mode;
int shpchp_poll_time;
struct controller *shpchp_ctrl_list; /* = NULL */
struct pci_func *shpchp_slot_list[256];
#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 shpc_start_thread (void);
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 shpchp_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,
};
/**
* 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;
dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
kfree(slot->hotplug_slot->info);
kfree(slot->hotplug_slot->name);
kfree(slot->hotplug_slot);
kfree(slot);
}
static int init_slots(struct controller *ctrl)
{
struct slot *new_slot;
u8 number_of_slots;
u8 slot_device;
u32 slot_number, sun;
int result = -ENOMEM;
dbg("%s\n",__FUNCTION__);
number_of_slots = ctrl->num_slots;
slot_device = ctrl->slot_device_offset;
slot_number = ctrl->first_slot;
while (number_of_slots) {
new_slot = (struct slot *) kmalloc(sizeof(struct slot), GFP_KERNEL);
if (!new_slot)
goto error;
memset(new_slot, 0, sizeof(struct slot));
new_slot->hotplug_slot = kmalloc (sizeof (struct hotplug_slot), GFP_KERNEL);
if (!new_slot->hotplug_slot)
goto error_slot;
memset(new_slot->hotplug_slot, 0, sizeof (struct hotplug_slot));
new_slot->hotplug_slot->info = kmalloc (sizeof (struct hotplug_slot_info), GFP_KERNEL);
if (!new_slot->hotplug_slot->info)
goto error_hpslot;
memset(new_slot->hotplug_slot->info, 0, sizeof (struct hotplug_slot_info));
new_slot->hotplug_slot->name = kmalloc (SLOT_NAME_SIZE, GFP_KERNEL);
if (!new_slot->hotplug_slot->name)
goto error_info;
new_slot->magic = SLOT_MAGIC;
new_slot->ctrl = ctrl;
new_slot->bus = ctrl->slot_bus;
new_slot->device = slot_device;
new_slot->hpc_ops = ctrl->hpc_ops;
if (shpchprm_get_physical_slot_number(ctrl, &sun,
new_slot->bus, new_slot->device))
goto error_name;
new_slot->number = sun;
new_slot->hp_slot = slot_device - ctrl->slot_device_offset;
/* register this slot with the hotplug pci core */
new_slot->hotplug_slot->private = new_slot;
new_slot->hotplug_slot->release = &release_slot;
make_slot_name(new_slot->hotplug_slot->name, SLOT_NAME_SIZE, new_slot);
new_slot->hotplug_slot->ops = &shpchp_hotplug_slot_ops;
new_slot->hpc_ops->get_power_status(new_slot, &(new_slot->hotplug_slot->info->power_status));
new_slot->hpc_ops->get_attention_status(new_slot, &(new_slot->hotplug_slot->info->attention_status));
new_slot->hpc_ops->get_latch_status(new_slot, &(new_slot->hotplug_slot->info->latch_status));
new_slot->hpc_ops->get_adapter_status(new_slot, &(new_slot->hotplug_slot->info->adapter_status));
dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x slot_device_offset=%x\n", new_slot->bus,
new_slot->device, new_slot->hp_slot, new_slot->number, ctrl->slot_device_offset);
result = pci_hp_register (new_slot->hotplug_slot);
if (result) {
err ("pci_hp_register failed with error %d\n", result);
goto error_name;
}
new_slot->next = ctrl->slot;
ctrl->slot = new_slot;
number_of_slots--;
slot_device++;
slot_number += ctrl->slot_num_inc;
}
return 0;
error_name:
kfree(new_slot->hotplug_slot->name);
error_info:
kfree(new_slot->hotplug_slot->info);
error_hpslot:
kfree(new_slot->hotplug_slot);
error_slot:
kfree(new_slot);
error:
return result;
}
static void cleanup_slots(struct controller *ctrl)
{
struct slot *old_slot, *next_slot;
old_slot = ctrl->slot;
ctrl->slot = NULL;
while (old_slot) {
next_slot = old_slot->next;
pci_hp_deregister(old_slot->hotplug_slot);
old_slot = next_slot;
}
}
static int get_ctlr_slot_config(struct controller *ctrl)
{
int num_ctlr_slots;
int first_device_num;
int physical_slot_num;
int updown;
int rc;
int flags;
rc = shpc_get_ctlr_slot_config(ctrl, &num_ctlr_slots, &first_device_num, &physical_slot_num, &updown, &flags);
if (rc) {
err("%s: get_ctlr_slot_config fail for b:d (%x:%x)\n", __FUNCTION__, ctrl->bus, ctrl->device);
return -1;
}
ctrl->num_slots = num_ctlr_slots;
ctrl->slot_device_offset = first_device_num;
ctrl->first_slot = physical_slot_num;
ctrl->slot_num_inc = updown; /* either -1 or 1 */
dbg("%s: num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) updown(%d) for b:d (%x:%x)\n",
__FUNCTION__, num_ctlr_slots, first_device_num, physical_slot_num, updown, ctrl->bus, ctrl->device);
return 0;
}
/*
* 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, __FUNCTION__);
dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
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, __FUNCTION__);
dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
return shpchp_enable_slot(slot);
}
static int disable_slot (struct hotplug_slot *hotplug_slot)
{
struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
return shpchp_disable_slot(slot);
}
static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
{
struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
int retval;
dbg("%s - physical_slot = %s\n", __FUNCTION__, 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 = get_slot (hotplug_slot, __FUNCTION__);
int retval;
dbg("%s - physical_slot = %s\n", __FUNCTION__, 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 = get_slot (hotplug_slot, __FUNCTION__);
int retval;
dbg("%s - physical_slot = %s\n", __FUNCTION__, 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 = get_slot (hotplug_slot, __FUNCTION__);
int retval;
dbg("%s - physical_slot = %s\n", __FUNCTION__, 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 = get_slot (hotplug_slot, __FUNCTION__);
int retval;
dbg("%s - physical_slot = %s\n", __FUNCTION__, 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 = get_slot (hotplug_slot, __FUNCTION__);
int retval;
dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
if (retval < 0)
*value = PCI_SPEED_UNKNOWN;
return 0;
}
static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
int rc;
struct controller *ctrl;
struct slot *t_slot;
int first_device_num; /* first PCI device number supported by this SHPC */
int num_ctlr_slots; /* number of slots supported by this SHPC */
ctrl = (struct controller *) kmalloc(sizeof(struct controller), GFP_KERNEL);
if (!ctrl) {
err("%s : out of memory\n", __FUNCTION__);
goto err_out_none;
}
memset(ctrl, 0, sizeof(struct controller));
dbg("DRV_thread pid = %d\n", current->pid);
rc = shpc_init(ctrl, pdev,
(php_intr_callback_t) shpchp_handle_attention_button,
(php_intr_callback_t) shpchp_handle_switch_change,
(php_intr_callback_t) shpchp_handle_presence_change,
(php_intr_callback_t) shpchp_handle_power_fault);
if (rc) {
dbg("%s: controller initialization failed\n", SHPC_MODULE_NAME);
goto err_out_free_ctrl;
}
dbg("%s: controller initialization success\n", __FUNCTION__);
ctrl->pci_dev = pdev; /* pci_dev of the P2P bridge */
pci_set_drvdata(pdev, ctrl);
ctrl->pci_bus = kmalloc (sizeof (*ctrl->pci_bus), GFP_KERNEL);
if (!ctrl->pci_bus) {
err("out of memory\n");
rc = -ENOMEM;
goto err_out_unmap_mmio_region;
}
memcpy (ctrl->pci_bus, pdev->bus, sizeof (*ctrl->pci_bus));
ctrl->bus = pdev->bus->number;
ctrl->slot_bus = pdev->subordinate->number;
ctrl->device = PCI_SLOT(pdev->devfn);
ctrl->function = PCI_FUNC(pdev->devfn);
dbg("ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", ctrl->bus, ctrl->device, ctrl->function, pdev->irq);
/*
* Save configuration headers for this and subordinate PCI buses
*/
rc = get_ctlr_slot_config(ctrl);
if (rc) {
err(msg_initialization_err, rc);
goto err_out_free_ctrl_bus;
}
first_device_num = ctrl->slot_device_offset;
num_ctlr_slots = ctrl->num_slots;
/* Store PCI Config Space for all devices on this bus */
rc = shpchp_save_config(ctrl, ctrl->slot_bus, num_ctlr_slots, first_device_num);
if (rc) {
err("%s: unable to save PCI configuration data, error %d\n", __FUNCTION__, rc);
goto err_out_free_ctrl_bus;
}
/* Get IO, memory, and IRQ resources for new devices */
rc = shpchprm_find_available_resources(ctrl);
ctrl->add_support = !rc;
if (rc) {
dbg("shpchprm_find_available_resources = %#x\n", rc);
err("unable to locate PCI configuration resources for hot plug add.\n");
goto err_out_free_ctrl_bus;
}
/* Setup the slot information structures */
rc = init_slots(ctrl);
if (rc) {
err(msg_initialization_err, 6);
goto err_out_free_ctrl_slot;
}
/* Now hpc_functions (slot->hpc_ops->functions) are ready */
t_slot = shpchp_find_slot(ctrl, first_device_num);
/* Check for operation bus speed */
rc = t_slot->hpc_ops->get_cur_bus_speed(t_slot, &ctrl->speed);
dbg("%s: t_slot->hp_slot %x\n", __FUNCTION__,t_slot->hp_slot);
if (rc || ctrl->speed == PCI_SPEED_UNKNOWN) {
err(SHPC_MODULE_NAME ": Can't get current bus speed. Set to 33MHz PCI.\n");
ctrl->speed = PCI_SPEED_33MHz;
}
/* Finish setting up the hot plug ctrl device */
ctrl->next_event = 0;
if (!shpchp_ctrl_list) {
shpchp_ctrl_list = ctrl;
ctrl->next = NULL;
} else {
ctrl->next = shpchp_ctrl_list;
shpchp_ctrl_list = ctrl;
}
shpchp_create_ctrl_files(ctrl);
return 0;
err_out_free_ctrl_slot:
cleanup_slots(ctrl);
err_out_free_ctrl_bus:
kfree(ctrl->pci_bus);
err_out_unmap_mmio_region:
ctrl->hpc_ops->release_ctlr(ctrl);
err_out_free_ctrl:
kfree(ctrl);
err_out_none:
return -ENODEV;
}
static int shpc_start_thread(void)
{
int loop;
int retval = 0;
dbg("Initialize + Start the notification/polling mechanism \n");
retval = shpchp_event_start_thread();
if (retval) {
dbg("shpchp_event_start_thread() failed\n");
return retval;
}
dbg("Initialize slot lists\n");
/* One slot list for each bus in the system */
for (loop = 0; loop < 256; loop++) {
shpchp_slot_list[loop] = NULL;
}
return retval;
}
static inline void __exit
free_shpchp_res(struct pci_resource *res)
{
struct pci_resource *tres;
while (res) {
tres = res;
res = res->next;
kfree(tres);
}
}
static void __exit unload_shpchpd(void)
{
struct pci_func *next;
struct pci_func *TempSlot;
int loop;
struct controller *ctrl;
struct controller *tctrl;
ctrl = shpchp_ctrl_list;
while (ctrl) {
cleanup_slots(ctrl);
free_shpchp_res(ctrl->io_head);
free_shpchp_res(ctrl->mem_head);
free_shpchp_res(ctrl->p_mem_head);
free_shpchp_res(ctrl->bus_head);
kfree (ctrl->pci_bus);
dbg("%s: calling release_ctlr\n", __FUNCTION__);
ctrl->hpc_ops->release_ctlr(ctrl);
tctrl = ctrl;
ctrl = ctrl->next;
kfree(tctrl);
}
for (loop = 0; loop < 256; loop++) {
next = shpchp_slot_list[loop];
while (next != NULL) {
free_shpchp_res(next->io_head);
free_shpchp_res(next->mem_head);
free_shpchp_res(next->p_mem_head);
free_shpchp_res(next->bus_head);
TempSlot = next;
next = next->next;
kfree(TempSlot);
}
}
/* Stop the notification mechanism */
shpchp_event_stop_thread();
}
static struct pci_device_id shpcd_pci_tbl[] = {
{
.class = ((PCI_CLASS_BRIDGE_PCI << 8) | 0x00),
.class_mask = ~0,
.vendor = PCI_ANY_ID,
.device = PCI_ANY_ID,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
},
{ /* 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_one, */
};
static int __init shpcd_init(void)
{
int retval = 0;
#ifdef CONFIG_HOTPLUG_PCI_SHPC_POLL_EVENT_MODE
shpchp_poll_mode = 1;
#endif
retval = shpc_start_thread();
if (retval)
goto error_hpc_init;
retval = shpchprm_init(PCI);
if (!retval) {
retval = pci_register_driver(&shpc_driver);
dbg("%s: pci_register_driver = %d\n", __FUNCTION__, retval);
info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
}
error_hpc_init:
if (retval) {
shpchprm_cleanup();
shpchp_event_stop_thread();
} else
shpchprm_print_pirt();
return retval;
}
static void __exit shpcd_cleanup(void)
{
dbg("unload_shpchpd()\n");
unload_shpchpd();
shpchprm_cleanup();
dbg("pci_unregister_driver\n");
pci_unregister_driver(&shpc_driver);
info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
}
module_init(shpcd_init);
module_exit(shpcd_cleanup);
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