forked from ~ljy/RK356X_SDK_RELEASE
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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/drivers/pci/hotplug/pciehp_ctrl.c
....@@ -13,24 +13,29 @@
1313  *
1414  */
1515 
16
-#include <linux/module.h>
16
+#define dev_fmt(fmt) "pciehp: " fmt
17
+
1718 #include <linux/kernel.h>
1819 #include <linux/types.h>
19
-#include <linux/slab.h>
2020 #include <linux/pm_runtime.h>
2121 #include <linux/pci.h>
22
-#include "../pci.h"
2322 #include "pciehp.h"
2423 
2524 /* The following routines constitute the bulk of the
2625    hotplug controller logic
2726  */
2827 
29
-static void set_slot_off(struct controller *ctrl, struct slot *pslot)
28
+#define SAFE_REMOVAL	 true
29
+#define SURPRISE_REMOVAL false
30
+
31
+static void set_slot_off(struct controller *ctrl)
3032 {
31
-	/* turn off slot, turn on Amber LED, turn off Green LED if supported*/
33
+	/*
34
+	 * Turn off slot, turn on attention indicator, turn off power
35
+	 * indicator
36
+	 */
3237 	if (POWER_CTRL(ctrl)) {
33
-		pciehp_power_off_slot(pslot);
38
+		pciehp_power_off_slot(ctrl);
3439 
3540 		/*
3641 		 * After turning power off, we must wait for at least 1 second
....@@ -40,47 +45,45 @@
4045 		msleep(1000);
4146 	}
4247 
43
-	pciehp_green_led_off(pslot);
44
-	pciehp_set_attention_status(pslot, 1);
48
+	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
49
+			      PCI_EXP_SLTCTL_ATTN_IND_ON);
4550 }
4651 
4752 /**
4853  * board_added - Called after a board has been added to the system.
49
- * @p_slot: &slot where board is added
54
+ * @ctrl: PCIe hotplug controller where board is added
5055  *
5156  * Turns power on for the board.
5257  * Configures board.
5358  */
54
-static int board_added(struct slot *p_slot)
59
+static int board_added(struct controller *ctrl)
5560 {
5661 	int retval = 0;
57
-	struct controller *ctrl = p_slot->ctrl;
5862 	struct pci_bus *parent = ctrl->pcie->port->subordinate;
5963 
6064 	if (POWER_CTRL(ctrl)) {
6165 		/* Power on slot */
62
-		retval = pciehp_power_on_slot(p_slot);
66
+		retval = pciehp_power_on_slot(ctrl);
6367 		if (retval)
6468 			return retval;
6569 	}
6670 
67
-	pciehp_green_led_blink(p_slot);
71
+	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
72
+			      INDICATOR_NOOP);
6873 
6974 	/* Check link training status */
7075 	retval = pciehp_check_link_status(ctrl);
71
-	if (retval) {
72
-		ctrl_err(ctrl, "Failed to check link status\n");
76
+	if (retval)
7377 		goto err_exit;
74
-	}
7578 
7679 	/* Check for a power fault */
77
-	if (ctrl->power_fault_detected || pciehp_query_power_fault(p_slot)) {
78
-		ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(p_slot));
80
+	if (ctrl->power_fault_detected || pciehp_query_power_fault(ctrl)) {
81
+		ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(ctrl));
7982 		retval = -EIO;
8083 		goto err_exit;
8184 	}
8285 
83
-	retval = pciehp_configure_device(p_slot);
86
+	retval = pciehp_configure_device(ctrl);
8487 	if (retval) {
8588 		if (retval != -EEXIST) {
8689 			ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
....@@ -89,27 +92,26 @@
8992 		}
9093 	}
9194 
92
-	pciehp_green_led_on(p_slot);
93
-	pciehp_set_attention_status(p_slot, 0);
95
+	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
96
+			      PCI_EXP_SLTCTL_ATTN_IND_OFF);
9497 	return 0;
9598 
9699 err_exit:
97
-	set_slot_off(ctrl, p_slot);
100
+	set_slot_off(ctrl);
98101 	return retval;
99102 }
100103 
101104 /**
102
- * remove_board - Turns off slot and LEDs
103
- * @p_slot: slot where board is being removed
105
+ * remove_board - Turn off slot and Power Indicator
106
+ * @ctrl: PCIe hotplug controller where board is being removed
107
+ * @safe_removal: whether the board is safely removed (versus surprise removed)
104108  */
105
-static void remove_board(struct slot *p_slot)
109
+static void remove_board(struct controller *ctrl, bool safe_removal)
106110 {
107
-	struct controller *ctrl = p_slot->ctrl;
108
-
109
-	pciehp_unconfigure_device(p_slot);
111
+	pciehp_unconfigure_device(ctrl, safe_removal);
110112 
111113 	if (POWER_CTRL(ctrl)) {
112
-		pciehp_power_off_slot(p_slot);
114
+		pciehp_power_off_slot(ctrl);
113115 
114116 		/*
115117 		 * After turning power off, we must wait for at least 1 second
....@@ -123,12 +125,12 @@
123125 			   &ctrl->pending_events);
124126 	}
125127 
126
-	/* turn off Green LED */
127
-	pciehp_green_led_off(p_slot);
128
+	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
129
+			      INDICATOR_NOOP);
128130 }
129131 
130
-static int pciehp_enable_slot(struct slot *slot);
131
-static int pciehp_disable_slot(struct slot *slot);
132
+static int pciehp_enable_slot(struct controller *ctrl);
133
+static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal);
132134 
133135 void pciehp_request(struct controller *ctrl, int action)
134136 {
....@@ -139,11 +141,11 @@
139141 
140142 void pciehp_queue_pushbutton_work(struct work_struct *work)
141143 {
142
-	struct slot *p_slot = container_of(work, struct slot, work.work);
143
-	struct controller *ctrl = p_slot->ctrl;
144
+	struct controller *ctrl = container_of(work, struct controller,
145
+					       button_work.work);
144146 
145
-	mutex_lock(&p_slot->lock);
146
-	switch (p_slot->state) {
147
+	mutex_lock(&ctrl->state_lock);
148
+	switch (ctrl->state) {
147149 	case BLINKINGOFF_STATE:
148150 		pciehp_request(ctrl, DISABLE_SLOT);
149151 		break;
....@@ -153,30 +155,28 @@
153155 	default:
154156 		break;
155157 	}
156
-	mutex_unlock(&p_slot->lock);
158
+	mutex_unlock(&ctrl->state_lock);
157159 }
158160 
159
-void pciehp_handle_button_press(struct slot *p_slot)
161
+void pciehp_handle_button_press(struct controller *ctrl)
160162 {
161
-	struct controller *ctrl = p_slot->ctrl;
162
-
163
-	mutex_lock(&p_slot->lock);
164
-	switch (p_slot->state) {
163
+	mutex_lock(&ctrl->state_lock);
164
+	switch (ctrl->state) {
165165 	case OFF_STATE:
166166 	case ON_STATE:
167
-		if (p_slot->state == ON_STATE) {
168
-			p_slot->state = BLINKINGOFF_STATE;
167
+		if (ctrl->state == ON_STATE) {
168
+			ctrl->state = BLINKINGOFF_STATE;
169169 			ctrl_info(ctrl, "Slot(%s): Powering off due to button press\n",
170
-				  slot_name(p_slot));
170
+				  slot_name(ctrl));
171171 		} else {
172
-			p_slot->state = BLINKINGON_STATE;
172
+			ctrl->state = BLINKINGON_STATE;
173173 			ctrl_info(ctrl, "Slot(%s) Powering on due to button press\n",
174
-				  slot_name(p_slot));
174
+				  slot_name(ctrl));
175175 		}
176
-		/* blink green LED and turn off amber */
177
-		pciehp_green_led_blink(p_slot);
178
-		pciehp_set_attention_status(p_slot, 0);
179
-		schedule_delayed_work(&p_slot->work, 5 * HZ);
176
+		/* blink power indicator and turn off attention */
177
+		pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
178
+				      PCI_EXP_SLTCTL_ATTN_IND_OFF);
179
+		schedule_delayed_work(&ctrl->button_work, 5 * HZ);
180180 		break;
181181 	case BLINKINGOFF_STATE:
182182 	case BLINKINGON_STATE:
....@@ -185,197 +185,195 @@
185185 		 * press the attention again before the 5 sec. limit
186186 		 * expires to cancel hot-add or hot-remove
187187 		 */
188
-		ctrl_info(ctrl, "Slot(%s): Button cancel\n", slot_name(p_slot));
189
-		cancel_delayed_work(&p_slot->work);
190
-		if (p_slot->state == BLINKINGOFF_STATE) {
191
-			p_slot->state = ON_STATE;
192
-			pciehp_green_led_on(p_slot);
188
+		ctrl_info(ctrl, "Slot(%s): Button cancel\n", slot_name(ctrl));
189
+		cancel_delayed_work(&ctrl->button_work);
190
+		if (ctrl->state == BLINKINGOFF_STATE) {
191
+			ctrl->state = ON_STATE;
192
+			pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
193
+					      PCI_EXP_SLTCTL_ATTN_IND_OFF);
193194 		} else {
194
-			p_slot->state = OFF_STATE;
195
-			pciehp_green_led_off(p_slot);
195
+			ctrl->state = OFF_STATE;
196
+			pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
197
+					      PCI_EXP_SLTCTL_ATTN_IND_OFF);
196198 		}
197
-		pciehp_set_attention_status(p_slot, 0);
198199 		ctrl_info(ctrl, "Slot(%s): Action canceled due to button press\n",
199
-			  slot_name(p_slot));
200
+			  slot_name(ctrl));
200201 		break;
201202 	default:
202203 		ctrl_err(ctrl, "Slot(%s): Ignoring invalid state %#x\n",
203
-			 slot_name(p_slot), p_slot->state);
204
+			 slot_name(ctrl), ctrl->state);
204205 		break;
205206 	}
206
-	mutex_unlock(&p_slot->lock);
207
+	mutex_unlock(&ctrl->state_lock);
207208 }
208209 
209
-void pciehp_handle_disable_request(struct slot *slot)
210
+void pciehp_handle_disable_request(struct controller *ctrl)
210211 {
211
-	struct controller *ctrl = slot->ctrl;
212
-
213
-	mutex_lock(&slot->lock);
214
-	switch (slot->state) {
212
+	mutex_lock(&ctrl->state_lock);
213
+	switch (ctrl->state) {
215214 	case BLINKINGON_STATE:
216215 	case BLINKINGOFF_STATE:
217
-		cancel_delayed_work(&slot->work);
216
+		cancel_delayed_work(&ctrl->button_work);
218217 		break;
219218 	}
220
-	slot->state = POWEROFF_STATE;
221
-	mutex_unlock(&slot->lock);
219
+	ctrl->state = POWEROFF_STATE;
220
+	mutex_unlock(&ctrl->state_lock);
222221 
223
-	ctrl->request_result = pciehp_disable_slot(slot);
222
+	ctrl->request_result = pciehp_disable_slot(ctrl, SAFE_REMOVAL);
224223 }
225224 
226
-void pciehp_handle_presence_or_link_change(struct slot *slot, u32 events)
225
+void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events)
227226 {
228
-	struct controller *ctrl = slot->ctrl;
229
-	bool link_active;
230
-	u8 present;
227
+	int present, link_active;
231228 
232229 	/*
233230 	 * If the slot is on and presence or link has changed, turn it off.
234231 	 * Even if it's occupied again, we cannot assume the card is the same.
235232 	 */
236
-	mutex_lock(&slot->lock);
237
-	switch (slot->state) {
233
+	mutex_lock(&ctrl->state_lock);
234
+	switch (ctrl->state) {
238235 	case BLINKINGOFF_STATE:
239
-		cancel_delayed_work(&slot->work);
240
-		/* fall through */
236
+		cancel_delayed_work(&ctrl->button_work);
237
+		fallthrough;
241238 	case ON_STATE:
242
-		slot->state = POWEROFF_STATE;
243
-		mutex_unlock(&slot->lock);
239
+		ctrl->state = POWEROFF_STATE;
240
+		mutex_unlock(&ctrl->state_lock);
244241 		if (events & PCI_EXP_SLTSTA_DLLSC)
245242 			ctrl_info(ctrl, "Slot(%s): Link Down\n",
246
-				  slot_name(slot));
243
+				  slot_name(ctrl));
247244 		if (events & PCI_EXP_SLTSTA_PDC)
248245 			ctrl_info(ctrl, "Slot(%s): Card not present\n",
249
-				  slot_name(slot));
250
-		pciehp_disable_slot(slot);
246
+				  slot_name(ctrl));
247
+		pciehp_disable_slot(ctrl, SURPRISE_REMOVAL);
251248 		break;
252249 	default:
253
-		mutex_unlock(&slot->lock);
250
+		mutex_unlock(&ctrl->state_lock);
254251 		break;
255252 	}
256253 
257254 	/* Turn the slot on if it's occupied or link is up */
258
-	mutex_lock(&slot->lock);
259
-	pciehp_get_adapter_status(slot, &present);
255
+	mutex_lock(&ctrl->state_lock);
256
+	present = pciehp_card_present(ctrl);
260257 	link_active = pciehp_check_link_active(ctrl);
261
-	if (!present && !link_active) {
262
-		mutex_unlock(&slot->lock);
258
+	if (present <= 0 && link_active <= 0) {
259
+		if (ctrl->state == BLINKINGON_STATE) {
260
+			ctrl->state = OFF_STATE;
261
+			cancel_delayed_work(&ctrl->button_work);
262
+			pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
263
+					      INDICATOR_NOOP);
264
+			ctrl_info(ctrl, "Slot(%s): Card not present\n",
265
+				  slot_name(ctrl));
266
+		}
267
+		mutex_unlock(&ctrl->state_lock);
263268 		return;
264269 	}
265270 
266
-	switch (slot->state) {
271
+	switch (ctrl->state) {
267272 	case BLINKINGON_STATE:
268
-		cancel_delayed_work(&slot->work);
269
-		/* fall through */
273
+		cancel_delayed_work(&ctrl->button_work);
274
+		fallthrough;
270275 	case OFF_STATE:
271
-		slot->state = POWERON_STATE;
272
-		mutex_unlock(&slot->lock);
276
+		ctrl->state = POWERON_STATE;
277
+		mutex_unlock(&ctrl->state_lock);
273278 		if (present)
274279 			ctrl_info(ctrl, "Slot(%s): Card present\n",
275
-				  slot_name(slot));
280
+				  slot_name(ctrl));
276281 		if (link_active)
277282 			ctrl_info(ctrl, "Slot(%s): Link Up\n",
278
-				  slot_name(slot));
279
-		ctrl->request_result = pciehp_enable_slot(slot);
283
+				  slot_name(ctrl));
284
+		ctrl->request_result = pciehp_enable_slot(ctrl);
280285 		break;
281286 	default:
282
-		mutex_unlock(&slot->lock);
287
+		mutex_unlock(&ctrl->state_lock);
283288 		break;
284289 	}
285290 }
286291 
287
-static int __pciehp_enable_slot(struct slot *p_slot)
292
+static int __pciehp_enable_slot(struct controller *ctrl)
288293 {
289294 	u8 getstatus = 0;
290
-	struct controller *ctrl = p_slot->ctrl;
291295 
292
-	pciehp_get_adapter_status(p_slot, &getstatus);
293
-	if (!getstatus) {
294
-		ctrl_info(ctrl, "Slot(%s): No adapter\n", slot_name(p_slot));
295
-		return -ENODEV;
296
-	}
297
-	if (MRL_SENS(p_slot->ctrl)) {
298
-		pciehp_get_latch_status(p_slot, &getstatus);
296
+	if (MRL_SENS(ctrl)) {
297
+		pciehp_get_latch_status(ctrl, &getstatus);
299298 		if (getstatus) {
300299 			ctrl_info(ctrl, "Slot(%s): Latch open\n",
301
-				  slot_name(p_slot));
300
+				  slot_name(ctrl));
302301 			return -ENODEV;
303302 		}
304303 	}
305304 
306
-	if (POWER_CTRL(p_slot->ctrl)) {
307
-		pciehp_get_power_status(p_slot, &getstatus);
305
+	if (POWER_CTRL(ctrl)) {
306
+		pciehp_get_power_status(ctrl, &getstatus);
308307 		if (getstatus) {
309308 			ctrl_info(ctrl, "Slot(%s): Already enabled\n",
310
-				  slot_name(p_slot));
309
+				  slot_name(ctrl));
311310 			return 0;
312311 		}
313312 	}
314313 
315
-	return board_added(p_slot);
314
+	return board_added(ctrl);
316315 }
317316 
318
-static int pciehp_enable_slot(struct slot *slot)
317
+static int pciehp_enable_slot(struct controller *ctrl)
319318 {
320
-	struct controller *ctrl = slot->ctrl;
321319 	int ret;
322320 
323321 	pm_runtime_get_sync(&ctrl->pcie->port->dev);
324
-	ret = __pciehp_enable_slot(slot);
322
+	ret = __pciehp_enable_slot(ctrl);
325323 	if (ret && ATTN_BUTTN(ctrl))
326
-		pciehp_green_led_off(slot); /* may be blinking */
324
+		/* may be blinking */
325
+		pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
326
+				      INDICATOR_NOOP);
327327 	pm_runtime_put(&ctrl->pcie->port->dev);
328328 
329
-	mutex_lock(&slot->lock);
330
-	slot->state = ret ? OFF_STATE : ON_STATE;
331
-	mutex_unlock(&slot->lock);
329
+	mutex_lock(&ctrl->state_lock);
330
+	ctrl->state = ret ? OFF_STATE : ON_STATE;
331
+	mutex_unlock(&ctrl->state_lock);
332332 
333333 	return ret;
334334 }
335335 
336
-static int __pciehp_disable_slot(struct slot *p_slot)
336
+static int __pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
337337 {
338338 	u8 getstatus = 0;
339
-	struct controller *ctrl = p_slot->ctrl;
340339 
341
-	if (POWER_CTRL(p_slot->ctrl)) {
342
-		pciehp_get_power_status(p_slot, &getstatus);
340
+	if (POWER_CTRL(ctrl)) {
341
+		pciehp_get_power_status(ctrl, &getstatus);
343342 		if (!getstatus) {
344343 			ctrl_info(ctrl, "Slot(%s): Already disabled\n",
345
-				  slot_name(p_slot));
344
+				  slot_name(ctrl));
346345 			return -EINVAL;
347346 		}
348347 	}
349348 
350
-	remove_board(p_slot);
349
+	remove_board(ctrl, safe_removal);
351350 	return 0;
352351 }
353352 
354
-static int pciehp_disable_slot(struct slot *slot)
353
+static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
355354 {
356
-	struct controller *ctrl = slot->ctrl;
357355 	int ret;
358356 
359357 	pm_runtime_get_sync(&ctrl->pcie->port->dev);
360
-	ret = __pciehp_disable_slot(slot);
358
+	ret = __pciehp_disable_slot(ctrl, safe_removal);
361359 	pm_runtime_put(&ctrl->pcie->port->dev);
362360 
363
-	mutex_lock(&slot->lock);
364
-	slot->state = OFF_STATE;
365
-	mutex_unlock(&slot->lock);
361
+	mutex_lock(&ctrl->state_lock);
362
+	ctrl->state = OFF_STATE;
363
+	mutex_unlock(&ctrl->state_lock);
366364 
367365 	return ret;
368366 }
369367 
370
-int pciehp_sysfs_enable_slot(struct slot *p_slot)
368
+int pciehp_sysfs_enable_slot(struct hotplug_slot *hotplug_slot)
371369 {
372
-	struct controller *ctrl = p_slot->ctrl;
370
+	struct controller *ctrl = to_ctrl(hotplug_slot);
373371 
374
-	mutex_lock(&p_slot->lock);
375
-	switch (p_slot->state) {
372
+	mutex_lock(&ctrl->state_lock);
373
+	switch (ctrl->state) {
376374 	case BLINKINGON_STATE:
377375 	case OFF_STATE:
378
-		mutex_unlock(&p_slot->lock);
376
+		mutex_unlock(&ctrl->state_lock);
379377 		/*
380378 		 * The IRQ thread becomes a no-op if the user pulls out the
381379 		 * card before the thread wakes up, so initialize to -ENODEV.
....@@ -388,33 +386,33 @@
388386 		return ctrl->request_result;
389387 	case POWERON_STATE:
390388 		ctrl_info(ctrl, "Slot(%s): Already in powering on state\n",
391
-			  slot_name(p_slot));
389
+			  slot_name(ctrl));
392390 		break;
393391 	case BLINKINGOFF_STATE:
394392 	case ON_STATE:
395393 	case POWEROFF_STATE:
396394 		ctrl_info(ctrl, "Slot(%s): Already enabled\n",
397
-			  slot_name(p_slot));
395
+			  slot_name(ctrl));
398396 		break;
399397 	default:
400398 		ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
401
-			 slot_name(p_slot), p_slot->state);
399
+			 slot_name(ctrl), ctrl->state);
402400 		break;
403401 	}
404
-	mutex_unlock(&p_slot->lock);
402
+	mutex_unlock(&ctrl->state_lock);
405403 
406404 	return -ENODEV;
407405 }
408406 
409
-int pciehp_sysfs_disable_slot(struct slot *p_slot)
407
+int pciehp_sysfs_disable_slot(struct hotplug_slot *hotplug_slot)
410408 {
411
-	struct controller *ctrl = p_slot->ctrl;
409
+	struct controller *ctrl = to_ctrl(hotplug_slot);
412410 
413
-	mutex_lock(&p_slot->lock);
414
-	switch (p_slot->state) {
411
+	mutex_lock(&ctrl->state_lock);
412
+	switch (ctrl->state) {
415413 	case BLINKINGOFF_STATE:
416414 	case ON_STATE:
417
-		mutex_unlock(&p_slot->lock);
415
+		mutex_unlock(&ctrl->state_lock);
418416 		pciehp_request(ctrl, DISABLE_SLOT);
419417 		wait_event(ctrl->requester,
420418 			   !atomic_read(&ctrl->pending_events) &&
....@@ -422,20 +420,20 @@
422420 		return ctrl->request_result;
423421 	case POWEROFF_STATE:
424422 		ctrl_info(ctrl, "Slot(%s): Already in powering off state\n",
425
-			  slot_name(p_slot));
423
+			  slot_name(ctrl));
426424 		break;
427425 	case BLINKINGON_STATE:
428426 	case OFF_STATE:
429427 	case POWERON_STATE:
430428 		ctrl_info(ctrl, "Slot(%s): Already disabled\n",
431
-			  slot_name(p_slot));
429
+			  slot_name(ctrl));
432430 		break;
433431 	default:
434432 		ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
435
-			 slot_name(p_slot), p_slot->state);
433
+			 slot_name(ctrl), ctrl->state);
436434 		break;
437435 	}
438
-	mutex_unlock(&p_slot->lock);
436
+	mutex_unlock(&ctrl->state_lock);
439437 
440438 	return -ENODEV;
441439 }