提交 34d03419 编写于 作者: K Kristen Carlson Accardi 提交者: Greg Kroah-Hartman

PCIEHP: Add Electro Mechanical Interlock (EMI) support to the PCIE hotplug driver.

Signed-off-by: NKristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
上级 262303fe
......@@ -69,6 +69,7 @@ struct slot {
struct hotplug_slot *hotplug_slot;
struct list_head slot_list;
char name[SLOT_NAME_SIZE];
unsigned long last_emi_toggle;
};
struct event_info {
......@@ -138,6 +139,7 @@ struct controller {
#define ATTN_LED_PRSN 0x00000008
#define PWR_LED_PRSN 0x00000010
#define HP_SUPR_RM_SUP 0x00000020
#define EMI_PRSN 0x00020000
#define ATTN_BUTTN(cap) (cap & ATTN_BUTTN_PRSN)
#define POWER_CTRL(cap) (cap & PWR_CTRL_PRSN)
......@@ -145,6 +147,7 @@ struct controller {
#define ATTN_LED(cap) (cap & ATTN_LED_PRSN)
#define PWR_LED(cap) (cap & PWR_LED_PRSN)
#define HP_SUPR_RM(cap) (cap & HP_SUPR_RM_SUP)
#define EMI(cap) (cap & EMI_PRSN)
extern int pciehp_event_start_thread(void);
extern void pciehp_event_stop_thread(void);
......@@ -182,6 +185,8 @@ struct hpc_ops {
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);
......
......@@ -34,6 +34,7 @@
#include <linux/pci.h>
#include "pciehp.h"
#include <linux/interrupt.h>
#include <linux/time.h>
/* Global variables */
int pciehp_debug;
......@@ -87,6 +88,95 @@ static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
.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
......@@ -159,6 +249,16 @@ static int init_slots(struct controller *ctrl)
err ("pci_hp_register failed with error %d\n", retval);
goto error_info;
}
/* create additional sysfs entries */
if (EMI(ctrl->ctrlcap)) {
retval = sysfs_create_file(&hotplug_slot->kobj,
&hotplug_slot_attr_lock.attr);
if (retval) {
pci_hp_deregister(hotplug_slot);
err("cannot create additional sysfs entries\n");
goto error_info;
}
}
list_add(&slot->slot_list, &ctrl->slot_list);
}
......@@ -183,6 +283,9 @@ static void cleanup_slots(struct controller *ctrl)
list_for_each_safe(tmp, next, &ctrl->slot_list) {
slot = list_entry(tmp, struct slot, slot_list);
list_del(&slot->slot_list);
if (EMI(ctrl->ctrlcap))
sysfs_remove_file(&slot->hotplug_slot->kobj,
&hotplug_slot_attr_lock.attr);
pci_hp_deregister(slot->hotplug_slot);
}
}
......
......@@ -35,6 +35,7 @@
#include <linux/timer.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/time.h>
#include "../pci.h"
#include "pciehp.h"
......@@ -192,6 +193,7 @@ static inline int pciehp_writel(struct controller *ctrl, int reg, u32 value)
#define ATTN_LED_CTRL 0x00C0
#define PWR_LED_CTRL 0x0300
#define PWR_CTRL 0x0400
#define EMI_CTRL 0x0800
/* Attention indicator and Power indicator states */
#define LED_ON 0x01
......@@ -202,6 +204,10 @@ static inline int pciehp_writel(struct controller *ctrl, int reg, u32 value)
#define POWER_ON 0
#define POWER_OFF 0x0400
/* EMI Status defines */
#define EMI_DISENGAGED 0
#define EMI_ENGAGED 1
/* Field definitions in Slot Status Register */
#define ATTN_BUTTN_PRESSED 0x0001
#define PWR_FAULT_DETECTED 0x0002
......@@ -210,6 +216,8 @@ static inline int pciehp_writel(struct controller *ctrl, int reg, u32 value)
#define CMD_COMPLETED 0x0010
#define MRL_STATE 0x0020
#define PRSN_STATE 0x0040
#define EMI_STATE 0x0080
#define EMI_STATUS_BIT 7
static spinlock_t hpc_event_lock;
......@@ -474,6 +482,51 @@ static int hpc_query_power_fault(struct slot *slot)
return pwr_fault;
}
static int hpc_get_emi_status(struct slot *slot, u8 *status)
{
struct controller *ctrl = slot->ctrl;
u16 slot_status;
int retval = 0;
DBG_ENTER_ROUTINE
retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
if (retval) {
err("%s : Cannot check EMI status\n", __FUNCTION__);
return retval;
}
*status = (slot_status & EMI_STATE) >> EMI_STATUS_BIT;
DBG_LEAVE_ROUTINE
return retval;
}
static int hpc_toggle_emi(struct slot *slot)
{
struct controller *ctrl = slot->ctrl;
u16 slot_cmd = 0;
u16 slot_ctrl;
int rc = 0;
DBG_ENTER_ROUTINE
rc = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
if (rc) {
err("%s : hp_register_read_word SLOT_CTRL failed\n",
__FUNCTION__);
return rc;
}
slot_cmd = (slot_ctrl | EMI_CTRL);
if (!pciehp_poll_mode)
slot_cmd = slot_cmd | HP_INTR_ENABLE;
pcie_write_cmd(slot, slot_cmd);
slot->last_emi_toggle = get_seconds();
DBG_LEAVE_ROUTINE
return rc;
}
static int hpc_set_attention_status(struct slot *slot, u8 value)
{
struct controller *ctrl = slot->ctrl;
......@@ -1009,6 +1062,8 @@ static struct hpc_ops pciehp_hpc_ops = {
.get_attention_status = hpc_get_attention_status,
.get_latch_status = hpc_get_latch_status,
.get_adapter_status = hpc_get_adapter_status,
.get_emi_status = hpc_get_emi_status,
.toggle_emi = hpc_toggle_emi,
.get_max_bus_speed = hpc_get_max_lnk_speed,
.get_cur_bus_speed = hpc_get_cur_lnk_speed,
......
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