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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * PCI Express Hot Plug Controller Driver
4 *
5 * Copyright (C) 1995,2001 Compaq Computer Corporation
6 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
7 * Copyright (C) 2001 IBM Corp.
8 * Copyright (C) 2003-2004 Intel Corporation
9 *
10 * All rights reserved.
11 *
12 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
13 *
14 */
15
16#define dev_fmt(fmt) "pciehp: " fmt
17
18#include <linux/kernel.h>
19#include <linux/types.h>
20#include <linux/pm_runtime.h>
21#include <linux/pci.h>
22#include "pciehp.h"
23
24/* The following routines constitute the bulk of the
25 hotplug controller logic
26 */
27
28#define SAFE_REMOVAL true
29#define SURPRISE_REMOVAL false
30
31static void set_slot_off(struct controller *ctrl)
32{
33 /*
34 * Turn off slot, turn on attention indicator, turn off power
35 * indicator
36 */
37 if (POWER_CTRL(ctrl)) {
38 pciehp_power_off_slot(ctrl);
39
40 /*
41 * After turning power off, we must wait for at least 1 second
42 * before taking any action that relies on power having been
43 * removed from the slot/adapter.
44 */
45 msleep(1000);
46 }
47
48 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
49 PCI_EXP_SLTCTL_ATTN_IND_ON);
50}
51
52/**
53 * board_added - Called after a board has been added to the system.
54 * @ctrl: PCIe hotplug controller where board is added
55 *
56 * Turns power on for the board.
57 * Configures board.
58 */
59static int board_added(struct controller *ctrl)
60{
61 int retval = 0;
62 struct pci_bus *parent = ctrl->pcie->port->subordinate;
63
64 if (POWER_CTRL(ctrl)) {
65 /* Power on slot */
66 retval = pciehp_power_on_slot(ctrl);
67 if (retval)
68 return retval;
69 }
70
71 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
72 INDICATOR_NOOP);
73
74 /* Check link training status */
75 retval = pciehp_check_link_status(ctrl);
76 if (retval) {
77 ctrl_err(ctrl, "Failed to check link status\n");
78 goto err_exit;
79 }
80
81 /* Check for a power fault */
82 if (ctrl->power_fault_detected || pciehp_query_power_fault(ctrl)) {
83 ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(ctrl));
84 retval = -EIO;
85 goto err_exit;
86 }
87
88 retval = pciehp_configure_device(ctrl);
89 if (retval) {
90 if (retval != -EEXIST) {
91 ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
92 pci_domain_nr(parent), parent->number);
93 goto err_exit;
94 }
95 }
96
97 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
98 PCI_EXP_SLTCTL_ATTN_IND_OFF);
99 return 0;
100
101err_exit:
102 set_slot_off(ctrl);
103 return retval;
104}
105
106/**
107 * remove_board - Turn off slot and Power Indicator
108 * @ctrl: PCIe hotplug controller where board is being removed
109 * @safe_removal: whether the board is safely removed (versus surprise removed)
110 */
111static void remove_board(struct controller *ctrl, bool safe_removal)
112{
113 pciehp_unconfigure_device(ctrl, safe_removal);
114
115 if (POWER_CTRL(ctrl)) {
116 pciehp_power_off_slot(ctrl);
117
118 /*
119 * After turning power off, we must wait for at least 1 second
120 * before taking any action that relies on power having been
121 * removed from the slot/adapter.
122 */
123 msleep(1000);
124
125 /* Ignore link or presence changes caused by power off */
126 atomic_and(~(PCI_EXP_SLTSTA_DLLSC | PCI_EXP_SLTSTA_PDC),
127 &ctrl->pending_events);
128 }
129
130 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
131 INDICATOR_NOOP);
132}
133
134static int pciehp_enable_slot(struct controller *ctrl);
135static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal);
136
137void pciehp_request(struct controller *ctrl, int action)
138{
139 atomic_or(action, &ctrl->pending_events);
140 if (!pciehp_poll_mode)
141 irq_wake_thread(ctrl->pcie->irq, ctrl);
142}
143
144void pciehp_queue_pushbutton_work(struct work_struct *work)
145{
146 struct controller *ctrl = container_of(work, struct controller,
147 button_work.work);
148
149 mutex_lock(&ctrl->state_lock);
150 switch (ctrl->state) {
151 case BLINKINGOFF_STATE:
152 pciehp_request(ctrl, DISABLE_SLOT);
153 break;
154 case BLINKINGON_STATE:
155 pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
156 break;
157 default:
158 break;
159 }
160 mutex_unlock(&ctrl->state_lock);
161}
162
163void pciehp_handle_button_press(struct controller *ctrl)
164{
165 mutex_lock(&ctrl->state_lock);
166 switch (ctrl->state) {
167 case OFF_STATE:
168 case ON_STATE:
169 if (ctrl->state == ON_STATE) {
170 ctrl->state = BLINKINGOFF_STATE;
171 ctrl_info(ctrl, "Slot(%s): Powering off due to button press\n",
172 slot_name(ctrl));
173 } else {
174 ctrl->state = BLINKINGON_STATE;
175 ctrl_info(ctrl, "Slot(%s) Powering on due to button press\n",
176 slot_name(ctrl));
177 }
178 /* blink power indicator and turn off attention */
179 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
180 PCI_EXP_SLTCTL_ATTN_IND_OFF);
181 schedule_delayed_work(&ctrl->button_work, 5 * HZ);
182 break;
183 case BLINKINGOFF_STATE:
184 case BLINKINGON_STATE:
185 /*
186 * Cancel if we are still blinking; this means that we
187 * press the attention again before the 5 sec. limit
188 * expires to cancel hot-add or hot-remove
189 */
190 ctrl_info(ctrl, "Slot(%s): Button cancel\n", slot_name(ctrl));
191 cancel_delayed_work(&ctrl->button_work);
192 if (ctrl->state == BLINKINGOFF_STATE) {
193 ctrl->state = ON_STATE;
194 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
195 PCI_EXP_SLTCTL_ATTN_IND_OFF);
196 } else {
197 ctrl->state = OFF_STATE;
198 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
199 PCI_EXP_SLTCTL_ATTN_IND_OFF);
200 }
201 ctrl_info(ctrl, "Slot(%s): Action canceled due to button press\n",
202 slot_name(ctrl));
203 break;
204 default:
205 ctrl_err(ctrl, "Slot(%s): Ignoring invalid state %#x\n",
206 slot_name(ctrl), ctrl->state);
207 break;
208 }
209 mutex_unlock(&ctrl->state_lock);
210}
211
212void pciehp_handle_disable_request(struct controller *ctrl)
213{
214 mutex_lock(&ctrl->state_lock);
215 switch (ctrl->state) {
216 case BLINKINGON_STATE:
217 case BLINKINGOFF_STATE:
218 cancel_delayed_work(&ctrl->button_work);
219 break;
220 }
221 ctrl->state = POWEROFF_STATE;
222 mutex_unlock(&ctrl->state_lock);
223
224 ctrl->request_result = pciehp_disable_slot(ctrl, SAFE_REMOVAL);
225}
226
227void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events)
228{
229 bool present, link_active;
230
231 /*
232 * If the slot is on and presence or link has changed, turn it off.
233 * Even if it's occupied again, we cannot assume the card is the same.
234 */
235 mutex_lock(&ctrl->state_lock);
236 switch (ctrl->state) {
237 case BLINKINGOFF_STATE:
238 cancel_delayed_work(&ctrl->button_work);
239 /* fall through */
240 case ON_STATE:
241 ctrl->state = POWEROFF_STATE;
242 mutex_unlock(&ctrl->state_lock);
243 if (events & PCI_EXP_SLTSTA_DLLSC)
244 ctrl_info(ctrl, "Slot(%s): Link Down\n",
245 slot_name(ctrl));
246 if (events & PCI_EXP_SLTSTA_PDC)
247 ctrl_info(ctrl, "Slot(%s): Card not present\n",
248 slot_name(ctrl));
249 pciehp_disable_slot(ctrl, SURPRISE_REMOVAL);
250 break;
251 default:
252 mutex_unlock(&ctrl->state_lock);
253 break;
254 }
255
256 /* Turn the slot on if it's occupied or link is up */
257 mutex_lock(&ctrl->state_lock);
258 present = pciehp_card_present(ctrl);
259 link_active = pciehp_check_link_active(ctrl);
260 if (!present && !link_active) {
261 mutex_unlock(&ctrl->state_lock);
262 return;
263 }
264
265 switch (ctrl->state) {
266 case BLINKINGON_STATE:
267 cancel_delayed_work(&ctrl->button_work);
268 /* fall through */
269 case OFF_STATE:
270 ctrl->state = POWERON_STATE;
271 mutex_unlock(&ctrl->state_lock);
272 if (present)
273 ctrl_info(ctrl, "Slot(%s): Card present\n",
274 slot_name(ctrl));
275 if (link_active)
276 ctrl_info(ctrl, "Slot(%s): Link Up\n",
277 slot_name(ctrl));
278 ctrl->request_result = pciehp_enable_slot(ctrl);
279 break;
280 default:
281 mutex_unlock(&ctrl->state_lock);
282 break;
283 }
284}
285
286static int __pciehp_enable_slot(struct controller *ctrl)
287{
288 u8 getstatus = 0;
289
290 if (MRL_SENS(ctrl)) {
291 pciehp_get_latch_status(ctrl, &getstatus);
292 if (getstatus) {
293 ctrl_info(ctrl, "Slot(%s): Latch open\n",
294 slot_name(ctrl));
295 return -ENODEV;
296 }
297 }
298
299 if (POWER_CTRL(ctrl)) {
300 pciehp_get_power_status(ctrl, &getstatus);
301 if (getstatus) {
302 ctrl_info(ctrl, "Slot(%s): Already enabled\n",
303 slot_name(ctrl));
304 return 0;
305 }
306 }
307
308 return board_added(ctrl);
309}
310
311static int pciehp_enable_slot(struct controller *ctrl)
312{
313 int ret;
314
315 pm_runtime_get_sync(&ctrl->pcie->port->dev);
316 ret = __pciehp_enable_slot(ctrl);
317 if (ret && ATTN_BUTTN(ctrl))
318 /* may be blinking */
319 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
320 INDICATOR_NOOP);
321 pm_runtime_put(&ctrl->pcie->port->dev);
322
323 mutex_lock(&ctrl->state_lock);
324 ctrl->state = ret ? OFF_STATE : ON_STATE;
325 mutex_unlock(&ctrl->state_lock);
326
327 return ret;
328}
329
330static int __pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
331{
332 u8 getstatus = 0;
333
334 if (POWER_CTRL(ctrl)) {
335 pciehp_get_power_status(ctrl, &getstatus);
336 if (!getstatus) {
337 ctrl_info(ctrl, "Slot(%s): Already disabled\n",
338 slot_name(ctrl));
339 return -EINVAL;
340 }
341 }
342
343 remove_board(ctrl, safe_removal);
344 return 0;
345}
346
347static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
348{
349 int ret;
350
351 pm_runtime_get_sync(&ctrl->pcie->port->dev);
352 ret = __pciehp_disable_slot(ctrl, safe_removal);
353 pm_runtime_put(&ctrl->pcie->port->dev);
354
355 mutex_lock(&ctrl->state_lock);
356 ctrl->state = OFF_STATE;
357 mutex_unlock(&ctrl->state_lock);
358
359 return ret;
360}
361
362int pciehp_sysfs_enable_slot(struct hotplug_slot *hotplug_slot)
363{
364 struct controller *ctrl = to_ctrl(hotplug_slot);
365
366 mutex_lock(&ctrl->state_lock);
367 switch (ctrl->state) {
368 case BLINKINGON_STATE:
369 case OFF_STATE:
370 mutex_unlock(&ctrl->state_lock);
371 /*
372 * The IRQ thread becomes a no-op if the user pulls out the
373 * card before the thread wakes up, so initialize to -ENODEV.
374 */
375 ctrl->request_result = -ENODEV;
376 pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
377 wait_event(ctrl->requester,
378 !atomic_read(&ctrl->pending_events));
379 return ctrl->request_result;
380 case POWERON_STATE:
381 ctrl_info(ctrl, "Slot(%s): Already in powering on state\n",
382 slot_name(ctrl));
383 break;
384 case BLINKINGOFF_STATE:
385 case ON_STATE:
386 case POWEROFF_STATE:
387 ctrl_info(ctrl, "Slot(%s): Already enabled\n",
388 slot_name(ctrl));
389 break;
390 default:
391 ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
392 slot_name(ctrl), ctrl->state);
393 break;
394 }
395 mutex_unlock(&ctrl->state_lock);
396
397 return -ENODEV;
398}
399
400int pciehp_sysfs_disable_slot(struct hotplug_slot *hotplug_slot)
401{
402 struct controller *ctrl = to_ctrl(hotplug_slot);
403
404 mutex_lock(&ctrl->state_lock);
405 switch (ctrl->state) {
406 case BLINKINGOFF_STATE:
407 case ON_STATE:
408 mutex_unlock(&ctrl->state_lock);
409 pciehp_request(ctrl, DISABLE_SLOT);
410 wait_event(ctrl->requester,
411 !atomic_read(&ctrl->pending_events));
412 return ctrl->request_result;
413 case POWEROFF_STATE:
414 ctrl_info(ctrl, "Slot(%s): Already in powering off state\n",
415 slot_name(ctrl));
416 break;
417 case BLINKINGON_STATE:
418 case OFF_STATE:
419 case POWERON_STATE:
420 ctrl_info(ctrl, "Slot(%s): Already disabled\n",
421 slot_name(ctrl));
422 break;
423 default:
424 ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
425 slot_name(ctrl), ctrl->state);
426 break;
427 }
428 mutex_unlock(&ctrl->state_lock);
429
430 return -ENODEV;
431}
1/*
2 * PCI Express Hot Plug Controller Driver
3 *
4 * Copyright (C) 1995,2001 Compaq Computer Corporation
5 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2001 IBM Corp.
7 * Copyright (C) 2003-2004 Intel Corporation
8 *
9 * All rights reserved.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
19 * NON INFRINGEMENT. See the GNU General Public License for more
20 * details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
27 *
28 */
29
30#include <linux/module.h>
31#include <linux/kernel.h>
32#include <linux/types.h>
33#include <linux/slab.h>
34#include <linux/pci.h>
35#include "../pci.h"
36#include "pciehp.h"
37
38static void interrupt_event_handler(struct work_struct *work);
39
40void pciehp_queue_interrupt_event(struct slot *p_slot, u32 event_type)
41{
42 struct event_info *info;
43
44 info = kmalloc(sizeof(*info), GFP_ATOMIC);
45 if (!info) {
46 ctrl_err(p_slot->ctrl, "dropped event %d (ENOMEM)\n", event_type);
47 return;
48 }
49
50 INIT_WORK(&info->work, interrupt_event_handler);
51 info->event_type = event_type;
52 info->p_slot = p_slot;
53 queue_work(p_slot->wq, &info->work);
54}
55
56/* The following routines constitute the bulk of the
57 hotplug controller logic
58 */
59
60static void set_slot_off(struct controller *ctrl, struct slot *pslot)
61{
62 /* turn off slot, turn on Amber LED, turn off Green LED if supported*/
63 if (POWER_CTRL(ctrl)) {
64 pciehp_power_off_slot(pslot);
65
66 /*
67 * After turning power off, we must wait for at least 1 second
68 * before taking any action that relies on power having been
69 * removed from the slot/adapter.
70 */
71 msleep(1000);
72 }
73
74 pciehp_green_led_off(pslot);
75 pciehp_set_attention_status(pslot, 1);
76}
77
78/**
79 * board_added - Called after a board has been added to the system.
80 * @p_slot: &slot where board is added
81 *
82 * Turns power on for the board.
83 * Configures board.
84 */
85static int board_added(struct slot *p_slot)
86{
87 int retval = 0;
88 struct controller *ctrl = p_slot->ctrl;
89 struct pci_bus *parent = ctrl->pcie->port->subordinate;
90
91 if (POWER_CTRL(ctrl)) {
92 /* Power on slot */
93 retval = pciehp_power_on_slot(p_slot);
94 if (retval)
95 return retval;
96 }
97
98 pciehp_green_led_blink(p_slot);
99
100 /* Check link training status */
101 retval = pciehp_check_link_status(ctrl);
102 if (retval) {
103 ctrl_err(ctrl, "Failed to check link status\n");
104 goto err_exit;
105 }
106
107 /* Check for a power fault */
108 if (ctrl->power_fault_detected || pciehp_query_power_fault(p_slot)) {
109 ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
110 retval = -EIO;
111 goto err_exit;
112 }
113
114 retval = pciehp_configure_device(p_slot);
115 if (retval) {
116 ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
117 pci_domain_nr(parent), parent->number);
118 if (retval != -EEXIST)
119 goto err_exit;
120 }
121
122 pciehp_green_led_on(p_slot);
123 return 0;
124
125err_exit:
126 set_slot_off(ctrl, p_slot);
127 return retval;
128}
129
130/**
131 * remove_board - Turns off slot and LEDs
132 * @p_slot: slot where board is being removed
133 */
134static int remove_board(struct slot *p_slot)
135{
136 int retval;
137 struct controller *ctrl = p_slot->ctrl;
138
139 retval = pciehp_unconfigure_device(p_slot);
140 if (retval)
141 return retval;
142
143 if (POWER_CTRL(ctrl)) {
144 pciehp_power_off_slot(p_slot);
145
146 /*
147 * After turning power off, we must wait for at least 1 second
148 * before taking any action that relies on power having been
149 * removed from the slot/adapter.
150 */
151 msleep(1000);
152 }
153
154 /* turn off Green LED */
155 pciehp_green_led_off(p_slot);
156 return 0;
157}
158
159struct power_work_info {
160 struct slot *p_slot;
161 struct work_struct work;
162 unsigned int req;
163#define DISABLE_REQ 0
164#define ENABLE_REQ 1
165};
166
167/**
168 * pciehp_power_thread - handle pushbutton events
169 * @work: &struct work_struct describing work to be done
170 *
171 * Scheduled procedure to handle blocking stuff for the pushbuttons.
172 * Handles all pending events and exits.
173 */
174static void pciehp_power_thread(struct work_struct *work)
175{
176 struct power_work_info *info =
177 container_of(work, struct power_work_info, work);
178 struct slot *p_slot = info->p_slot;
179 int ret;
180
181 switch (info->req) {
182 case DISABLE_REQ:
183 mutex_lock(&p_slot->hotplug_lock);
184 pciehp_disable_slot(p_slot);
185 mutex_unlock(&p_slot->hotplug_lock);
186 mutex_lock(&p_slot->lock);
187 p_slot->state = STATIC_STATE;
188 mutex_unlock(&p_slot->lock);
189 break;
190 case ENABLE_REQ:
191 mutex_lock(&p_slot->hotplug_lock);
192 ret = pciehp_enable_slot(p_slot);
193 mutex_unlock(&p_slot->hotplug_lock);
194 if (ret)
195 pciehp_green_led_off(p_slot);
196 mutex_lock(&p_slot->lock);
197 p_slot->state = STATIC_STATE;
198 mutex_unlock(&p_slot->lock);
199 break;
200 default:
201 break;
202 }
203
204 kfree(info);
205}
206
207static void pciehp_queue_power_work(struct slot *p_slot, int req)
208{
209 struct power_work_info *info;
210
211 p_slot->state = (req == ENABLE_REQ) ? POWERON_STATE : POWEROFF_STATE;
212
213 info = kmalloc(sizeof(*info), GFP_KERNEL);
214 if (!info) {
215 ctrl_err(p_slot->ctrl, "no memory to queue %s request\n",
216 (req == ENABLE_REQ) ? "poweron" : "poweroff");
217 return;
218 }
219 info->p_slot = p_slot;
220 INIT_WORK(&info->work, pciehp_power_thread);
221 info->req = req;
222 queue_work(p_slot->wq, &info->work);
223}
224
225void pciehp_queue_pushbutton_work(struct work_struct *work)
226{
227 struct slot *p_slot = container_of(work, struct slot, work.work);
228
229 mutex_lock(&p_slot->lock);
230 switch (p_slot->state) {
231 case BLINKINGOFF_STATE:
232 pciehp_queue_power_work(p_slot, DISABLE_REQ);
233 break;
234 case BLINKINGON_STATE:
235 pciehp_queue_power_work(p_slot, ENABLE_REQ);
236 break;
237 default:
238 break;
239 }
240 mutex_unlock(&p_slot->lock);
241}
242
243/*
244 * Note: This function must be called with slot->lock held
245 */
246static void handle_button_press_event(struct slot *p_slot)
247{
248 struct controller *ctrl = p_slot->ctrl;
249 u8 getstatus;
250
251 switch (p_slot->state) {
252 case STATIC_STATE:
253 pciehp_get_power_status(p_slot, &getstatus);
254 if (getstatus) {
255 p_slot->state = BLINKINGOFF_STATE;
256 ctrl_info(ctrl, "PCI slot #%s - powering off due to button press\n",
257 slot_name(p_slot));
258 } else {
259 p_slot->state = BLINKINGON_STATE;
260 ctrl_info(ctrl, "PCI slot #%s - powering on due to button press\n",
261 slot_name(p_slot));
262 }
263 /* blink green LED and turn off amber */
264 pciehp_green_led_blink(p_slot);
265 pciehp_set_attention_status(p_slot, 0);
266 queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
267 break;
268 case BLINKINGOFF_STATE:
269 case BLINKINGON_STATE:
270 /*
271 * Cancel if we are still blinking; this means that we
272 * press the attention again before the 5 sec. limit
273 * expires to cancel hot-add or hot-remove
274 */
275 ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot));
276 cancel_delayed_work(&p_slot->work);
277 if (p_slot->state == BLINKINGOFF_STATE)
278 pciehp_green_led_on(p_slot);
279 else
280 pciehp_green_led_off(p_slot);
281 pciehp_set_attention_status(p_slot, 0);
282 ctrl_info(ctrl, "PCI slot #%s - action canceled due to button press\n",
283 slot_name(p_slot));
284 p_slot->state = STATIC_STATE;
285 break;
286 case POWEROFF_STATE:
287 case POWERON_STATE:
288 /*
289 * Ignore if the slot is on power-on or power-off state;
290 * this means that the previous attention button action
291 * to hot-add or hot-remove is undergoing
292 */
293 ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot));
294 break;
295 default:
296 ctrl_warn(ctrl, "ignoring invalid state %#x\n", p_slot->state);
297 break;
298 }
299}
300
301/*
302 * Note: This function must be called with slot->lock held
303 */
304static void handle_surprise_event(struct slot *p_slot)
305{
306 u8 getstatus;
307
308 pciehp_get_adapter_status(p_slot, &getstatus);
309 if (!getstatus)
310 pciehp_queue_power_work(p_slot, DISABLE_REQ);
311 else
312 pciehp_queue_power_work(p_slot, ENABLE_REQ);
313}
314
315/*
316 * Note: This function must be called with slot->lock held
317 */
318static void handle_link_event(struct slot *p_slot, u32 event)
319{
320 struct controller *ctrl = p_slot->ctrl;
321
322 switch (p_slot->state) {
323 case BLINKINGON_STATE:
324 case BLINKINGOFF_STATE:
325 cancel_delayed_work(&p_slot->work);
326 /* Fall through */
327 case STATIC_STATE:
328 pciehp_queue_power_work(p_slot, event == INT_LINK_UP ?
329 ENABLE_REQ : DISABLE_REQ);
330 break;
331 case POWERON_STATE:
332 if (event == INT_LINK_UP) {
333 ctrl_info(ctrl,
334 "Link Up event ignored on slot(%s): already powering on\n",
335 slot_name(p_slot));
336 } else {
337 ctrl_info(ctrl,
338 "Link Down event queued on slot(%s): currently getting powered on\n",
339 slot_name(p_slot));
340 pciehp_queue_power_work(p_slot, DISABLE_REQ);
341 }
342 break;
343 case POWEROFF_STATE:
344 if (event == INT_LINK_UP) {
345 ctrl_info(ctrl,
346 "Link Up event queued on slot(%s): currently getting powered off\n",
347 slot_name(p_slot));
348 pciehp_queue_power_work(p_slot, ENABLE_REQ);
349 } else {
350 ctrl_info(ctrl,
351 "Link Down event ignored on slot(%s): already powering off\n",
352 slot_name(p_slot));
353 }
354 break;
355 default:
356 ctrl_err(ctrl, "ignoring invalid state %#x on slot(%s)\n",
357 p_slot->state, slot_name(p_slot));
358 break;
359 }
360}
361
362static void interrupt_event_handler(struct work_struct *work)
363{
364 struct event_info *info = container_of(work, struct event_info, work);
365 struct slot *p_slot = info->p_slot;
366 struct controller *ctrl = p_slot->ctrl;
367
368 mutex_lock(&p_slot->lock);
369 switch (info->event_type) {
370 case INT_BUTTON_PRESS:
371 handle_button_press_event(p_slot);
372 break;
373 case INT_POWER_FAULT:
374 if (!POWER_CTRL(ctrl))
375 break;
376 pciehp_set_attention_status(p_slot, 1);
377 pciehp_green_led_off(p_slot);
378 break;
379 case INT_PRESENCE_ON:
380 handle_surprise_event(p_slot);
381 break;
382 case INT_PRESENCE_OFF:
383 /*
384 * Regardless of surprise capability, we need to
385 * definitely remove a card that has been pulled out!
386 */
387 handle_surprise_event(p_slot);
388 break;
389 case INT_LINK_UP:
390 case INT_LINK_DOWN:
391 handle_link_event(p_slot, info->event_type);
392 break;
393 default:
394 break;
395 }
396 mutex_unlock(&p_slot->lock);
397
398 kfree(info);
399}
400
401/*
402 * Note: This function must be called with slot->hotplug_lock held
403 */
404int pciehp_enable_slot(struct slot *p_slot)
405{
406 u8 getstatus = 0;
407 int rc;
408 struct controller *ctrl = p_slot->ctrl;
409
410 pciehp_get_adapter_status(p_slot, &getstatus);
411 if (!getstatus) {
412 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
413 return -ENODEV;
414 }
415 if (MRL_SENS(p_slot->ctrl)) {
416 pciehp_get_latch_status(p_slot, &getstatus);
417 if (getstatus) {
418 ctrl_info(ctrl, "Latch open on slot(%s)\n",
419 slot_name(p_slot));
420 return -ENODEV;
421 }
422 }
423
424 if (POWER_CTRL(p_slot->ctrl)) {
425 pciehp_get_power_status(p_slot, &getstatus);
426 if (getstatus) {
427 ctrl_info(ctrl, "Already enabled on slot(%s)\n",
428 slot_name(p_slot));
429 return -EINVAL;
430 }
431 }
432
433 pciehp_get_latch_status(p_slot, &getstatus);
434
435 rc = board_added(p_slot);
436 if (rc)
437 pciehp_get_latch_status(p_slot, &getstatus);
438
439 return rc;
440}
441
442/*
443 * Note: This function must be called with slot->hotplug_lock held
444 */
445int pciehp_disable_slot(struct slot *p_slot)
446{
447 u8 getstatus = 0;
448 struct controller *ctrl = p_slot->ctrl;
449
450 if (!p_slot->ctrl)
451 return 1;
452
453 if (POWER_CTRL(p_slot->ctrl)) {
454 pciehp_get_power_status(p_slot, &getstatus);
455 if (!getstatus) {
456 ctrl_info(ctrl, "Already disabled on slot(%s)\n",
457 slot_name(p_slot));
458 return -EINVAL;
459 }
460 }
461
462 return remove_board(p_slot);
463}
464
465int pciehp_sysfs_enable_slot(struct slot *p_slot)
466{
467 int retval = -ENODEV;
468 struct controller *ctrl = p_slot->ctrl;
469
470 mutex_lock(&p_slot->lock);
471 switch (p_slot->state) {
472 case BLINKINGON_STATE:
473 cancel_delayed_work(&p_slot->work);
474 case STATIC_STATE:
475 p_slot->state = POWERON_STATE;
476 mutex_unlock(&p_slot->lock);
477 mutex_lock(&p_slot->hotplug_lock);
478 retval = pciehp_enable_slot(p_slot);
479 mutex_unlock(&p_slot->hotplug_lock);
480 mutex_lock(&p_slot->lock);
481 p_slot->state = STATIC_STATE;
482 break;
483 case POWERON_STATE:
484 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
485 slot_name(p_slot));
486 break;
487 case BLINKINGOFF_STATE:
488 case POWEROFF_STATE:
489 ctrl_info(ctrl, "Already enabled on slot %s\n",
490 slot_name(p_slot));
491 break;
492 default:
493 ctrl_err(ctrl, "invalid state %#x on slot %s\n",
494 p_slot->state, slot_name(p_slot));
495 break;
496 }
497 mutex_unlock(&p_slot->lock);
498
499 return retval;
500}
501
502int pciehp_sysfs_disable_slot(struct slot *p_slot)
503{
504 int retval = -ENODEV;
505 struct controller *ctrl = p_slot->ctrl;
506
507 mutex_lock(&p_slot->lock);
508 switch (p_slot->state) {
509 case BLINKINGOFF_STATE:
510 cancel_delayed_work(&p_slot->work);
511 case STATIC_STATE:
512 p_slot->state = POWEROFF_STATE;
513 mutex_unlock(&p_slot->lock);
514 mutex_lock(&p_slot->hotplug_lock);
515 retval = pciehp_disable_slot(p_slot);
516 mutex_unlock(&p_slot->hotplug_lock);
517 mutex_lock(&p_slot->lock);
518 p_slot->state = STATIC_STATE;
519 break;
520 case POWEROFF_STATE:
521 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
522 slot_name(p_slot));
523 break;
524 case BLINKINGON_STATE:
525 case POWERON_STATE:
526 ctrl_info(ctrl, "Already disabled on slot %s\n",
527 slot_name(p_slot));
528 break;
529 default:
530 ctrl_err(ctrl, "invalid state %#x on slot %s\n",
531 p_slot->state, slot_name(p_slot));
532 break;
533 }
534 mutex_unlock(&p_slot->lock);
535
536 return retval;
537}