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linux/drivers/pci/hotplug/pciehp.h
Alex Chiang 167e782e30 PCI: pciehp: Rename duplicate slot name N as N-1, N-2, N-M... 
Commit 3800345f72 (pciehp: fix slot name)
introduces the pciehp_slot_with_bus module parameter, which was intended
to help work around broken firmware that assigns the same name to multiple
slots.

Commit 9e4f2e8d4d (pciehp: add message about
pciehp_slot_with_bus option) tells the user to use the above parameter
in the event of a name collision.

This approach is sub-optimal because it requires too much work from
the user.

Instead, let's rename the slot on behalf of the user. If firmware
assigns the name N to multiple slots, then:

	The first registered slot is assigned N
	The second registered slot is assigned N-1
	The third registered slot is assigned N-2
	The Mth registered slot becomes N-M

In the event we overflow the slot->name parameter, we report an
error to the user.

This is a temporary fix until the entire PCI core can be reworked
such that individual drivers no longer have to manage their own
slot names.

Tested-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Acked-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-08-21 15:15:10 -07:00

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/*
* 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>
*
*/
#ifndef _PCIEHP_H
#define _PCIEHP_H
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/delay.h>
#include <linux/sched.h> /* signal_pending() */
#include <linux/pcieport_if.h>
#include <linux/mutex.h>
#define MY_NAME "pciehp"
extern int pciehp_poll_mode;
extern int pciehp_poll_time;
extern int pciehp_debug;
extern int pciehp_force;
extern struct workqueue_struct *pciehp_wq;
#define dbg(format, arg...) \
do { \
if (pciehp_debug) \
printk("%s: " format, MY_NAME , ## arg); \
} while (0)
#define err(format, arg...) \
printk(KERN_ERR "%s: " format, MY_NAME , ## arg)
#define info(format, arg...) \
printk(KERN_INFO "%s: " format, MY_NAME , ## arg)
#define warn(format, arg...) \
printk(KERN_WARNING "%s: " format, MY_NAME , ## arg)
#define SLOT_NAME_SIZE 10
struct slot {
u8 bus;
u8 device;
u32 number;
u8 state;
struct timer_list task_event;
u8 hp_slot;
struct controller *ctrl;
struct hpc_ops *hpc_ops;
struct hotplug_slot *hotplug_slot;
struct list_head slot_list;
char name[SLOT_NAME_SIZE];
unsigned long last_emi_toggle;
struct delayed_work work; /* work for button event */
struct mutex lock;
};
struct event_info {
u32 event_type;
struct slot *p_slot;
struct work_struct work;
};
struct controller {
struct mutex crit_sect; /* critical section mutex */
struct mutex ctrl_lock; /* controller lock */
int num_slots; /* Number of slots on ctlr */
int slot_num_inc; /* 1 or -1 */
struct pci_dev *pci_dev;
struct list_head slot_list;
struct hpc_ops *hpc_ops;
wait_queue_head_t queue; /* sleep & wake process */
u8 slot_device_offset;
u32 first_slot; /* First physical slot number */ /* PCIE only has 1 slot */
u8 slot_bus; /* Bus where the slots handled by this controller sit */
u32 slot_cap;
u8 cap_base;
struct timer_list poll_timer;
int cmd_busy;
unsigned int no_cmd_complete:1;
};
#define INT_BUTTON_IGNORE 0
#define INT_PRESENCE_ON 1
#define INT_PRESENCE_OFF 2
#define INT_SWITCH_CLOSE 3
#define INT_SWITCH_OPEN 4
#define INT_POWER_FAULT 5
#define INT_POWER_FAULT_CLEAR 6
#define INT_BUTTON_PRESS 7
#define INT_BUTTON_RELEASE 8
#define INT_BUTTON_CANCEL 9
#define STATIC_STATE 0
#define BLINKINGON_STATE 1
#define BLINKINGOFF_STATE 2
#define POWERON_STATE 3
#define POWEROFF_STATE 4
/* Error messages */
#define INTERLOCK_OPEN 0x00000002
#define ADD_NOT_SUPPORTED 0x00000003
#define CARD_FUNCTIONING 0x00000005
#define ADAPTER_NOT_SAME 0x00000006
#define NO_ADAPTER_PRESENT 0x00000009
#define NOT_ENOUGH_RESOURCES 0x0000000B
#define DEVICE_TYPE_NOT_SUPPORTED 0x0000000C
#define WRONG_BUS_FREQUENCY 0x0000000D
#define POWER_FAILURE 0x0000000E
/* Field definitions in Slot Capabilities Register */
#define ATTN_BUTTN_PRSN 0x00000001
#define PWR_CTRL_PRSN 0x00000002
#define MRL_SENS_PRSN 0x00000004
#define ATTN_LED_PRSN 0x00000008
#define PWR_LED_PRSN 0x00000010
#define HP_SUPR_RM_SUP 0x00000020
#define EMI_PRSN 0x00020000
#define NO_CMD_CMPL_SUP 0x00040000
#define ATTN_BUTTN(ctrl) ((ctrl)->slot_cap & ATTN_BUTTN_PRSN)
#define POWER_CTRL(ctrl) ((ctrl)->slot_cap & PWR_CTRL_PRSN)
#define MRL_SENS(ctrl) ((ctrl)->slot_cap & MRL_SENS_PRSN)
#define ATTN_LED(ctrl) ((ctrl)->slot_cap & ATTN_LED_PRSN)
#define PWR_LED(ctrl) ((ctrl)->slot_cap & PWR_LED_PRSN)
#define HP_SUPR_RM(ctrl) ((ctrl)->slot_cap & HP_SUPR_RM_SUP)
#define EMI(ctrl) ((ctrl)->slot_cap & EMI_PRSN)
#define NO_CMD_CMPL(ctrl) ((ctrl)->slot_cap & NO_CMD_CMPL_SUP)
extern int pciehp_sysfs_enable_slot(struct slot *slot);
extern int pciehp_sysfs_disable_slot(struct slot *slot);
extern u8 pciehp_handle_attention_button(struct slot *p_slot);
extern u8 pciehp_handle_switch_change(struct slot *p_slot);
extern u8 pciehp_handle_presence_change(struct slot *p_slot);
extern u8 pciehp_handle_power_fault(struct slot *p_slot);
extern int pciehp_configure_device(struct slot *p_slot);
extern int pciehp_unconfigure_device(struct slot *p_slot);
extern void pciehp_queue_pushbutton_work(struct work_struct *work);
struct controller *pcie_init(struct pcie_device *dev);
int pciehp_enable_slot(struct slot *p_slot);
int pciehp_disable_slot(struct slot *p_slot);
int pcie_enable_notification(struct controller *ctrl);
static inline struct slot *pciehp_find_slot(struct controller *ctrl, u8 device)
{
struct slot *slot;
list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
if (slot->device == device)
return slot;
}
err("%s: slot (device=0x%x) not found\n", __func__, device);
return NULL;
}
struct hpc_ops {
int (*power_on_slot)(struct slot *slot);
int (*power_off_slot)(struct slot *slot);
int (*get_power_status)(struct slot *slot, u8 *status);
int (*get_attention_status)(struct slot *slot, u8 *status);
int (*set_attention_status)(struct slot *slot, u8 status);
int (*get_latch_status)(struct slot *slot, u8 *status);
int (*get_adapter_status)(struct slot *slot, u8 *status);
int (*get_emi_status)(struct slot *slot, u8 *status);
int (*toggle_emi)(struct slot *slot);
int (*get_max_bus_speed)(struct slot *slot, enum pci_bus_speed *speed);
int (*get_cur_bus_speed)(struct slot *slot, enum pci_bus_speed *speed);
int (*get_max_lnk_width)(struct slot *slot, enum pcie_link_width *val);
int (*get_cur_lnk_width)(struct slot *slot, enum pcie_link_width *val);
int (*query_power_fault)(struct slot *slot);
void (*green_led_on)(struct slot *slot);
void (*green_led_off)(struct slot *slot);
void (*green_led_blink)(struct slot *slot);
void (*release_ctlr)(struct controller *ctrl);
int (*check_lnk_status)(struct controller *ctrl);
};
#ifdef CONFIG_ACPI
#include <acpi/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/actypes.h>
#include <linux/pci-acpi.h>
static inline int pciehp_get_hp_hw_control_from_firmware(struct pci_dev *dev)
{
u32 flags = (OSC_PCI_EXPRESS_NATIVE_HP_CONTROL |
OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
return acpi_get_hp_hw_control_from_firmware(dev, flags);
}
static inline int pciehp_get_hp_params_from_firmware(struct pci_dev *dev,
struct hotplug_params *hpp)
{
if (ACPI_FAILURE(acpi_get_hp_params_from_firmware(dev->bus, hpp)))
return -ENODEV;
return 0;
}
#else
#define pciehp_get_hp_hw_control_from_firmware(dev) 0
#define pciehp_get_hp_params_from_firmware(dev, hpp) (-ENODEV)
#endif /* CONFIG_ACPI */
#endif /* _PCIEHP_H */
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