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

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Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Kristen Carlson Accardi
2007-01-09 13:02:36 -08:00
committed by Greg Kroah-Hartman
parent 262303fe32
commit 34d03419f0
3 changed files with 163 additions and 0 deletions
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55
drivers/pci/hotplug/pciehp_hpc.c
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@ -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,