PCIEHP: Add Electro Mechanical Interlock (EMI) support to the PCIE hotplug driver.
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index eb1862b..fbc64aa 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -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 @@
#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 @@
#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 @@
#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 @@
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 @@
.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,