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705 lines
17 KiB
705 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Standard Hot Plug Controller Driver |
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* |
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* Copyright (C) 1995,2001 Compaq Computer Corporation |
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* Copyright (C) 2001 Greg Kroah-Hartman ([email protected]) |
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* Copyright (C) 2001 IBM Corp. |
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* Copyright (C) 2003-2004 Intel Corporation |
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* |
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* All rights reserved. |
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* |
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* Send feedback to <[email protected]>, <[email protected]> |
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* |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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#include <linux/slab.h> |
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#include <linux/pci.h> |
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#include "../pci.h" |
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#include "shpchp.h" |
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static void interrupt_event_handler(struct work_struct *work); |
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static int shpchp_enable_slot(struct slot *p_slot); |
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static int shpchp_disable_slot(struct slot *p_slot); |
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static int queue_interrupt_event(struct slot *p_slot, u32 event_type) |
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{ |
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struct event_info *info; |
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info = kmalloc(sizeof(*info), GFP_ATOMIC); |
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if (!info) |
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return -ENOMEM; |
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info->event_type = event_type; |
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info->p_slot = p_slot; |
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INIT_WORK(&info->work, interrupt_event_handler); |
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queue_work(p_slot->wq, &info->work); |
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return 0; |
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} |
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u8 shpchp_handle_attention_button(u8 hp_slot, struct controller *ctrl) |
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{ |
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struct slot *p_slot; |
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u32 event_type; |
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/* Attention Button Change */ |
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ctrl_dbg(ctrl, "Attention button interrupt received\n"); |
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p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); |
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p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save)); |
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|
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/* |
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* Button pressed - See if need to TAKE ACTION!!! |
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*/ |
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ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot)); |
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event_type = INT_BUTTON_PRESS; |
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queue_interrupt_event(p_slot, event_type); |
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return 0; |
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} |
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u8 shpchp_handle_switch_change(u8 hp_slot, struct controller *ctrl) |
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{ |
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struct slot *p_slot; |
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u8 getstatus; |
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u32 event_type; |
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/* Switch Change */ |
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ctrl_dbg(ctrl, "Switch interrupt received\n"); |
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p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); |
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p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save)); |
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p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); |
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ctrl_dbg(ctrl, "Card present %x Power status %x\n", |
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p_slot->presence_save, p_slot->pwr_save); |
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if (getstatus) { |
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/* |
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* Switch opened |
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*/ |
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ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot)); |
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event_type = INT_SWITCH_OPEN; |
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if (p_slot->pwr_save && p_slot->presence_save) { |
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event_type = INT_POWER_FAULT; |
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ctrl_err(ctrl, "Surprise Removal of card\n"); |
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} |
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} else { |
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/* |
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* Switch closed |
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*/ |
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ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot)); |
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event_type = INT_SWITCH_CLOSE; |
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} |
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queue_interrupt_event(p_slot, event_type); |
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return 1; |
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} |
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u8 shpchp_handle_presence_change(u8 hp_slot, struct controller *ctrl) |
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{ |
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struct slot *p_slot; |
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u32 event_type; |
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/* Presence Change */ |
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ctrl_dbg(ctrl, "Presence/Notify input change\n"); |
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p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); |
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/* |
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* Save the presence state |
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*/ |
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p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save)); |
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if (p_slot->presence_save) { |
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/* |
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* Card Present |
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*/ |
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ctrl_info(ctrl, "Card present on Slot(%s)\n", |
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slot_name(p_slot)); |
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event_type = INT_PRESENCE_ON; |
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} else { |
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/* |
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* Not Present |
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*/ |
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ctrl_info(ctrl, "Card not present on Slot(%s)\n", |
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slot_name(p_slot)); |
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event_type = INT_PRESENCE_OFF; |
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} |
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queue_interrupt_event(p_slot, event_type); |
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return 1; |
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} |
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u8 shpchp_handle_power_fault(u8 hp_slot, struct controller *ctrl) |
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{ |
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struct slot *p_slot; |
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u32 event_type; |
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/* Power fault */ |
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ctrl_dbg(ctrl, "Power fault interrupt received\n"); |
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p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); |
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if (!(p_slot->hpc_ops->query_power_fault(p_slot))) { |
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/* |
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* Power fault Cleared |
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*/ |
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ctrl_info(ctrl, "Power fault cleared on Slot(%s)\n", |
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slot_name(p_slot)); |
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p_slot->status = 0x00; |
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event_type = INT_POWER_FAULT_CLEAR; |
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} else { |
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/* |
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* Power fault |
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*/ |
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ctrl_info(ctrl, "Power fault on Slot(%s)\n", slot_name(p_slot)); |
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event_type = INT_POWER_FAULT; |
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/* set power fault status for this board */ |
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p_slot->status = 0xFF; |
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ctrl_info(ctrl, "Power fault bit %x set\n", hp_slot); |
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} |
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queue_interrupt_event(p_slot, event_type); |
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return 1; |
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} |
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/* The following routines constitute the bulk of the |
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hotplug controller logic |
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*/ |
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static int change_bus_speed(struct controller *ctrl, struct slot *p_slot, |
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enum pci_bus_speed speed) |
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{ |
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int rc = 0; |
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ctrl_dbg(ctrl, "Change speed to %d\n", speed); |
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rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, speed); |
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if (rc) { |
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ctrl_err(ctrl, "%s: Issue of set bus speed mode command failed\n", |
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__func__); |
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return WRONG_BUS_FREQUENCY; |
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} |
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return rc; |
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} |
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static int fix_bus_speed(struct controller *ctrl, struct slot *pslot, |
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u8 flag, enum pci_bus_speed asp, enum pci_bus_speed bsp, |
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enum pci_bus_speed msp) |
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{ |
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int rc = 0; |
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/* |
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* If other slots on the same bus are occupied, we cannot |
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* change the bus speed. |
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*/ |
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if (flag) { |
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if (asp < bsp) { |
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ctrl_err(ctrl, "Speed of bus %x and adapter %x mismatch\n", |
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bsp, asp); |
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rc = WRONG_BUS_FREQUENCY; |
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} |
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return rc; |
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} |
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if (asp < msp) { |
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if (bsp != asp) |
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rc = change_bus_speed(ctrl, pslot, asp); |
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} else { |
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if (bsp != msp) |
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rc = change_bus_speed(ctrl, pslot, msp); |
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} |
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return rc; |
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} |
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/** |
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* board_added - Called after a board has been added to the system. |
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* @p_slot: target &slot |
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* |
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* Turns power on for the board. |
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* Configures board. |
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*/ |
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static int board_added(struct slot *p_slot) |
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{ |
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u8 hp_slot; |
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u8 slots_not_empty = 0; |
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int rc = 0; |
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enum pci_bus_speed asp, bsp, msp; |
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struct controller *ctrl = p_slot->ctrl; |
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struct pci_bus *parent = ctrl->pci_dev->subordinate; |
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hp_slot = p_slot->device - ctrl->slot_device_offset; |
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ctrl_dbg(ctrl, "%s: p_slot->device, slot_offset, hp_slot = %d, %d ,%d\n", |
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__func__, p_slot->device, ctrl->slot_device_offset, hp_slot); |
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/* Power on slot without connecting to bus */ |
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rc = p_slot->hpc_ops->power_on_slot(p_slot); |
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if (rc) { |
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ctrl_err(ctrl, "Failed to power on slot\n"); |
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return -1; |
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} |
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if ((ctrl->pci_dev->vendor == 0x8086) && (ctrl->pci_dev->device == 0x0332)) { |
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rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, PCI_SPEED_33MHz); |
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if (rc) { |
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ctrl_err(ctrl, "%s: Issue of set bus speed mode command failed\n", |
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__func__); |
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return WRONG_BUS_FREQUENCY; |
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} |
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/* turn on board, blink green LED, turn off Amber LED */ |
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rc = p_slot->hpc_ops->slot_enable(p_slot); |
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if (rc) { |
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ctrl_err(ctrl, "Issue of Slot Enable command failed\n"); |
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return rc; |
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} |
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} |
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rc = p_slot->hpc_ops->get_adapter_speed(p_slot, &asp); |
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if (rc) { |
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ctrl_err(ctrl, "Can't get adapter speed or bus mode mismatch\n"); |
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return WRONG_BUS_FREQUENCY; |
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} |
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bsp = ctrl->pci_dev->subordinate->cur_bus_speed; |
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msp = ctrl->pci_dev->subordinate->max_bus_speed; |
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/* Check if there are other slots or devices on the same bus */ |
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if (!list_empty(&ctrl->pci_dev->subordinate->devices)) |
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slots_not_empty = 1; |
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ctrl_dbg(ctrl, "%s: slots_not_empty %d, adapter_speed %d, bus_speed %d, max_bus_speed %d\n", |
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__func__, slots_not_empty, asp, |
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bsp, msp); |
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rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp); |
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if (rc) |
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return rc; |
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/* turn on board, blink green LED, turn off Amber LED */ |
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rc = p_slot->hpc_ops->slot_enable(p_slot); |
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if (rc) { |
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ctrl_err(ctrl, "Issue of Slot Enable command failed\n"); |
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return rc; |
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} |
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/* Wait for ~1 second */ |
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msleep(1000); |
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ctrl_dbg(ctrl, "%s: slot status = %x\n", __func__, p_slot->status); |
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/* Check for a power fault */ |
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if (p_slot->status == 0xFF) { |
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/* power fault occurred, but it was benign */ |
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ctrl_dbg(ctrl, "%s: Power fault\n", __func__); |
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p_slot->status = 0; |
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goto err_exit; |
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} |
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if (shpchp_configure_device(p_slot)) { |
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ctrl_err(ctrl, "Cannot add device at %04x:%02x:%02x\n", |
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pci_domain_nr(parent), p_slot->bus, p_slot->device); |
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goto err_exit; |
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} |
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p_slot->status = 0; |
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p_slot->is_a_board = 0x01; |
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p_slot->pwr_save = 1; |
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p_slot->hpc_ops->green_led_on(p_slot); |
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return 0; |
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err_exit: |
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/* turn off slot, turn on Amber LED, turn off Green LED */ |
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rc = p_slot->hpc_ops->slot_disable(p_slot); |
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if (rc) { |
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ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n", |
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__func__); |
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return rc; |
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} |
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return(rc); |
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} |
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/** |
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* remove_board - Turns off slot and LEDs |
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* @p_slot: target &slot |
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*/ |
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static int remove_board(struct slot *p_slot) |
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{ |
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struct controller *ctrl = p_slot->ctrl; |
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u8 hp_slot; |
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int rc; |
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shpchp_unconfigure_device(p_slot); |
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hp_slot = p_slot->device - ctrl->slot_device_offset; |
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p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); |
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ctrl_dbg(ctrl, "%s: hp_slot = %d\n", __func__, hp_slot); |
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/* Change status to shutdown */ |
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if (p_slot->is_a_board) |
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p_slot->status = 0x01; |
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/* turn off slot, turn on Amber LED, turn off Green LED */ |
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rc = p_slot->hpc_ops->slot_disable(p_slot); |
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if (rc) { |
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ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n", |
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__func__); |
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return rc; |
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} |
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rc = p_slot->hpc_ops->set_attention_status(p_slot, 0); |
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if (rc) { |
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ctrl_err(ctrl, "Issue of Set Attention command failed\n"); |
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return rc; |
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} |
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p_slot->pwr_save = 0; |
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p_slot->is_a_board = 0; |
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return 0; |
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} |
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struct pushbutton_work_info { |
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struct slot *p_slot; |
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struct work_struct work; |
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}; |
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/** |
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* shpchp_pushbutton_thread - handle pushbutton events |
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* @work: &struct work_struct to be handled |
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* |
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* Scheduled procedure to handle blocking stuff for the pushbuttons. |
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* Handles all pending events and exits. |
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*/ |
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static void shpchp_pushbutton_thread(struct work_struct *work) |
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{ |
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struct pushbutton_work_info *info = |
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container_of(work, struct pushbutton_work_info, work); |
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struct slot *p_slot = info->p_slot; |
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mutex_lock(&p_slot->lock); |
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switch (p_slot->state) { |
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case POWEROFF_STATE: |
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mutex_unlock(&p_slot->lock); |
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shpchp_disable_slot(p_slot); |
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mutex_lock(&p_slot->lock); |
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p_slot->state = STATIC_STATE; |
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break; |
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case POWERON_STATE: |
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mutex_unlock(&p_slot->lock); |
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if (shpchp_enable_slot(p_slot)) |
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p_slot->hpc_ops->green_led_off(p_slot); |
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mutex_lock(&p_slot->lock); |
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p_slot->state = STATIC_STATE; |
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break; |
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default: |
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break; |
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} |
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mutex_unlock(&p_slot->lock); |
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kfree(info); |
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} |
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void shpchp_queue_pushbutton_work(struct work_struct *work) |
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{ |
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struct slot *p_slot = container_of(work, struct slot, work.work); |
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struct pushbutton_work_info *info; |
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info = kmalloc(sizeof(*info), GFP_KERNEL); |
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if (!info) { |
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ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n", |
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__func__); |
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return; |
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} |
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info->p_slot = p_slot; |
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INIT_WORK(&info->work, shpchp_pushbutton_thread); |
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mutex_lock(&p_slot->lock); |
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switch (p_slot->state) { |
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case BLINKINGOFF_STATE: |
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p_slot->state = POWEROFF_STATE; |
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break; |
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case BLINKINGON_STATE: |
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p_slot->state = POWERON_STATE; |
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break; |
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default: |
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kfree(info); |
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goto out; |
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} |
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queue_work(p_slot->wq, &info->work); |
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out: |
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mutex_unlock(&p_slot->lock); |
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} |
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static void update_slot_info(struct slot *slot) |
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{ |
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slot->hpc_ops->get_power_status(slot, &slot->pwr_save); |
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slot->hpc_ops->get_attention_status(slot, &slot->attention_save); |
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slot->hpc_ops->get_latch_status(slot, &slot->latch_save); |
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slot->hpc_ops->get_adapter_status(slot, &slot->presence_save); |
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} |
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/* |
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* Note: This function must be called with slot->lock held |
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*/ |
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static void handle_button_press_event(struct slot *p_slot) |
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{ |
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u8 getstatus; |
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struct controller *ctrl = p_slot->ctrl; |
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switch (p_slot->state) { |
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case STATIC_STATE: |
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p_slot->hpc_ops->get_power_status(p_slot, &getstatus); |
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if (getstatus) { |
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p_slot->state = BLINKINGOFF_STATE; |
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ctrl_info(ctrl, "PCI slot #%s - powering off due to button press\n", |
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slot_name(p_slot)); |
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} else { |
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p_slot->state = BLINKINGON_STATE; |
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ctrl_info(ctrl, "PCI slot #%s - powering on due to button press\n", |
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slot_name(p_slot)); |
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} |
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/* blink green LED and turn off amber */ |
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p_slot->hpc_ops->green_led_blink(p_slot); |
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p_slot->hpc_ops->set_attention_status(p_slot, 0); |
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queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ); |
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break; |
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case BLINKINGOFF_STATE: |
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case BLINKINGON_STATE: |
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/* |
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* Cancel if we are still blinking; this means that we |
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* press the attention again before the 5 sec. limit |
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* expires to cancel hot-add or hot-remove |
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*/ |
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ctrl_info(ctrl, "Button cancel on Slot(%s)\n", |
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slot_name(p_slot)); |
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cancel_delayed_work(&p_slot->work); |
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if (p_slot->state == BLINKINGOFF_STATE) |
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p_slot->hpc_ops->green_led_on(p_slot); |
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else |
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p_slot->hpc_ops->green_led_off(p_slot); |
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p_slot->hpc_ops->set_attention_status(p_slot, 0); |
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ctrl_info(ctrl, "PCI slot #%s - action canceled due to button press\n", |
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slot_name(p_slot)); |
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p_slot->state = STATIC_STATE; |
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break; |
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case POWEROFF_STATE: |
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case POWERON_STATE: |
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/* |
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* Ignore if the slot is on power-on or power-off state; |
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* this means that the previous attention button action |
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* to hot-add or hot-remove is undergoing |
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*/ |
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ctrl_info(ctrl, "Button ignore on Slot(%s)\n", |
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slot_name(p_slot)); |
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update_slot_info(p_slot); |
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break; |
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default: |
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ctrl_warn(ctrl, "Not a valid state\n"); |
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break; |
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} |
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} |
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|
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static void interrupt_event_handler(struct work_struct *work) |
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{ |
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struct event_info *info = container_of(work, struct event_info, work); |
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struct slot *p_slot = info->p_slot; |
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|
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mutex_lock(&p_slot->lock); |
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switch (info->event_type) { |
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case INT_BUTTON_PRESS: |
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handle_button_press_event(p_slot); |
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break; |
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case INT_POWER_FAULT: |
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ctrl_dbg(p_slot->ctrl, "%s: Power fault\n", __func__); |
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p_slot->hpc_ops->set_attention_status(p_slot, 1); |
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p_slot->hpc_ops->green_led_off(p_slot); |
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break; |
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default: |
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update_slot_info(p_slot); |
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break; |
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} |
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mutex_unlock(&p_slot->lock); |
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|
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kfree(info); |
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} |
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static int shpchp_enable_slot (struct slot *p_slot) |
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{ |
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u8 getstatus = 0; |
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int rc, retval = -ENODEV; |
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struct controller *ctrl = p_slot->ctrl; |
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|
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/* Check to see if (latch closed, card present, power off) */ |
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mutex_lock(&p_slot->ctrl->crit_sect); |
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rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus); |
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if (rc || !getstatus) { |
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ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot)); |
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goto out; |
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} |
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rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); |
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if (rc || getstatus) { |
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ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot)); |
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goto out; |
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} |
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rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus); |
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if (rc || getstatus) { |
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ctrl_info(ctrl, "Already enabled on slot(%s)\n", |
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slot_name(p_slot)); |
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goto out; |
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} |
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|
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p_slot->is_a_board = 1; |
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|
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/* We have to save the presence info for these slots */ |
|
p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save)); |
|
p_slot->hpc_ops->get_power_status(p_slot, &(p_slot->pwr_save)); |
|
ctrl_dbg(ctrl, "%s: p_slot->pwr_save %x\n", __func__, p_slot->pwr_save); |
|
p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); |
|
|
|
if ((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD && |
|
p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458) |
|
&& p_slot->ctrl->num_slots == 1) { |
|
/* handle AMD POGO errata; this must be done before enable */ |
|
amd_pogo_errata_save_misc_reg(p_slot); |
|
retval = board_added(p_slot); |
|
/* handle AMD POGO errata; this must be done after enable */ |
|
amd_pogo_errata_restore_misc_reg(p_slot); |
|
} else |
|
retval = board_added(p_slot); |
|
|
|
if (retval) { |
|
p_slot->hpc_ops->get_adapter_status(p_slot, |
|
&(p_slot->presence_save)); |
|
p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); |
|
} |
|
|
|
update_slot_info(p_slot); |
|
out: |
|
mutex_unlock(&p_slot->ctrl->crit_sect); |
|
return retval; |
|
} |
|
|
|
|
|
static int shpchp_disable_slot (struct slot *p_slot) |
|
{ |
|
u8 getstatus = 0; |
|
int rc, retval = -ENODEV; |
|
struct controller *ctrl = p_slot->ctrl; |
|
|
|
if (!p_slot->ctrl) |
|
return -ENODEV; |
|
|
|
/* Check to see if (latch closed, card present, power on) */ |
|
mutex_lock(&p_slot->ctrl->crit_sect); |
|
|
|
rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus); |
|
if (rc || !getstatus) { |
|
ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot)); |
|
goto out; |
|
} |
|
rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); |
|
if (rc || getstatus) { |
|
ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot)); |
|
goto out; |
|
} |
|
rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus); |
|
if (rc || !getstatus) { |
|
ctrl_info(ctrl, "Already disabled on slot(%s)\n", |
|
slot_name(p_slot)); |
|
goto out; |
|
} |
|
|
|
retval = remove_board(p_slot); |
|
update_slot_info(p_slot); |
|
out: |
|
mutex_unlock(&p_slot->ctrl->crit_sect); |
|
return retval; |
|
} |
|
|
|
int shpchp_sysfs_enable_slot(struct slot *p_slot) |
|
{ |
|
int retval = -ENODEV; |
|
struct controller *ctrl = p_slot->ctrl; |
|
|
|
mutex_lock(&p_slot->lock); |
|
switch (p_slot->state) { |
|
case BLINKINGON_STATE: |
|
cancel_delayed_work(&p_slot->work); |
|
fallthrough; |
|
case STATIC_STATE: |
|
p_slot->state = POWERON_STATE; |
|
mutex_unlock(&p_slot->lock); |
|
retval = shpchp_enable_slot(p_slot); |
|
mutex_lock(&p_slot->lock); |
|
p_slot->state = STATIC_STATE; |
|
break; |
|
case POWERON_STATE: |
|
ctrl_info(ctrl, "Slot %s is already in powering on state\n", |
|
slot_name(p_slot)); |
|
break; |
|
case BLINKINGOFF_STATE: |
|
case POWEROFF_STATE: |
|
ctrl_info(ctrl, "Already enabled on slot %s\n", |
|
slot_name(p_slot)); |
|
break; |
|
default: |
|
ctrl_err(ctrl, "Not a valid state on slot %s\n", |
|
slot_name(p_slot)); |
|
break; |
|
} |
|
mutex_unlock(&p_slot->lock); |
|
|
|
return retval; |
|
} |
|
|
|
int shpchp_sysfs_disable_slot(struct slot *p_slot) |
|
{ |
|
int retval = -ENODEV; |
|
struct controller *ctrl = p_slot->ctrl; |
|
|
|
mutex_lock(&p_slot->lock); |
|
switch (p_slot->state) { |
|
case BLINKINGOFF_STATE: |
|
cancel_delayed_work(&p_slot->work); |
|
fallthrough; |
|
case STATIC_STATE: |
|
p_slot->state = POWEROFF_STATE; |
|
mutex_unlock(&p_slot->lock); |
|
retval = shpchp_disable_slot(p_slot); |
|
mutex_lock(&p_slot->lock); |
|
p_slot->state = STATIC_STATE; |
|
break; |
|
case POWEROFF_STATE: |
|
ctrl_info(ctrl, "Slot %s is already in powering off state\n", |
|
slot_name(p_slot)); |
|
break; |
|
case BLINKINGON_STATE: |
|
case POWERON_STATE: |
|
ctrl_info(ctrl, "Already disabled on slot %s\n", |
|
slot_name(p_slot)); |
|
break; |
|
default: |
|
ctrl_err(ctrl, "Not a valid state on slot %s\n", |
|
slot_name(p_slot)); |
|
break; |
|
} |
|
mutex_unlock(&p_slot->lock); |
|
|
|
return retval; |
|
}
|
|
|