From 34d03419f03bcfdf70d9617a9b90b60c93482c4a Mon Sep 17 00:00:00 2001 From: Kristen Carlson Accardi Date: Tue, 9 Jan 2007 13:02:36 -0800 Subject: [PATCH] PCIEHP: Add Electro Mechanical Interlock (EMI) support to the PCIE hotplug driver. Signed-off-by: Kristen Carlson Accardi Signed-off-by: Greg Kroah-Hartman --- drivers/pci/hotplug/pciehp.h | 5 ++ drivers/pci/hotplug/pciehp_core.c | 103 ++++++++++++++++++++++++++++++ drivers/pci/hotplug/pciehp_hpc.c | 55 ++++++++++++++++ 3 files changed, 163 insertions(+) diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h index 927dba9911e..d19fcae8a7c 100644 --- a/drivers/pci/hotplug/pciehp.h +++ b/drivers/pci/hotplug/pciehp.h @@ -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); diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c index f7b8e0504fe..a92eda6e02f 100644 --- a/drivers/pci/hotplug/pciehp_core.c +++ b/drivers/pci/hotplug/pciehp_core.c @@ -34,6 +34,7 @@ #include #include "pciehp.h" #include +#include /* 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); } } diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index eb1862b50bb..fbc64aa2dd6 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -35,6 +35,7 @@ #include #include #include +#include #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, -- 2.20.1