summaryrefslogtreecommitdiff
path: root/drivers/misc/mei/pci-txe.c
blob: fa20d9a27813b715e06b42de7c3c5075cd0709a8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2013-2020, Intel Corporation. All rights reserved.
 * Intel Management Engine Interface (Intel MEI) Linux driver
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>

#include <linux/mei.h>


#include "mei_dev.h"
#include "hw-txe.h"

static const struct pci_device_id mei_txe_pci_tbl[] = {
	{PCI_VDEVICE(INTEL, 0x0F18)}, /* Baytrail */
	{PCI_VDEVICE(INTEL, 0x2298)}, /* Cherrytrail */

	{0, }
};
MODULE_DEVICE_TABLE(pci, mei_txe_pci_tbl);

#ifdef CONFIG_PM
static inline void mei_txe_set_pm_domain(struct mei_device *dev);
static inline void mei_txe_unset_pm_domain(struct mei_device *dev);
#else
static inline void mei_txe_set_pm_domain(struct mei_device *dev) {}
static inline void mei_txe_unset_pm_domain(struct mei_device *dev) {}
#endif /* CONFIG_PM */

/**
 * mei_txe_probe - Device Initialization Routine
 *
 * @pdev: PCI device structure
 * @ent: entry in mei_txe_pci_tbl
 *
 * Return: 0 on success, <0 on failure.
 */
static int mei_txe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	struct mei_device *dev;
	struct mei_txe_hw *hw;
	const int mask = BIT(SEC_BAR) | BIT(BRIDGE_BAR);
	int err;

	/* enable pci dev */
	err = pcim_enable_device(pdev);
	if (err) {
		dev_err(&pdev->dev, "failed to enable pci device.\n");
		goto end;
	}
	/* set PCI host mastering  */
	pci_set_master(pdev);
	/* pci request regions and mapping IO device memory for mei driver */
	err = pcim_iomap_regions(pdev, mask, KBUILD_MODNAME);
	if (err) {
		dev_err(&pdev->dev, "failed to get pci regions.\n");
		goto end;
	}

	err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(36));
	if (err) {
		err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
		if (err) {
			dev_err(&pdev->dev, "No suitable DMA available.\n");
			goto end;
		}
	}

	/* allocates and initializes the mei dev structure */
	dev = mei_txe_dev_init(pdev);
	if (!dev) {
		err = -ENOMEM;
		goto end;
	}
	hw = to_txe_hw(dev);
	hw->mem_addr = pcim_iomap_table(pdev);

	pci_enable_msi(pdev);

	/* clear spurious interrupts */
	mei_clear_interrupts(dev);

	/* request and enable interrupt  */
	if (pci_dev_msi_enabled(pdev))
		err = request_threaded_irq(pdev->irq,
			NULL,
			mei_txe_irq_thread_handler,
			IRQF_ONESHOT, KBUILD_MODNAME, dev);
	else
		err = request_threaded_irq(pdev->irq,
			mei_txe_irq_quick_handler,
			mei_txe_irq_thread_handler,
			IRQF_SHARED, KBUILD_MODNAME, dev);
	if (err) {
		dev_err(&pdev->dev, "mei: request_threaded_irq failure. irq = %d\n",
			pdev->irq);
		goto end;
	}

	if (mei_start(dev)) {
		dev_err(&pdev->dev, "init hw failure.\n");
		err = -ENODEV;
		goto release_irq;
	}

	pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_TXI_RPM_TIMEOUT);
	pm_runtime_use_autosuspend(&pdev->dev);

	err = mei_register(dev, &pdev->dev);
	if (err)
		goto stop;

	pci_set_drvdata(pdev, dev);

	/*
	 * MEI requires to resume from runtime suspend mode
	 * in order to perform link reset flow upon system suspend.
	 */
	dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NO_DIRECT_COMPLETE);

	/*
	 * TXE maps runtime suspend/resume to own power gating states,
	 * hence we need to go around native PCI runtime service which
	 * eventually brings the device into D3cold/hot state.
	 * But the TXE device cannot wake up from D3 unlike from own
	 * power gating. To get around PCI device native runtime pm,
	 * TXE uses runtime pm domain handlers which take precedence.
	 */
	mei_txe_set_pm_domain(dev);

	pm_runtime_put_noidle(&pdev->dev);

	return 0;

stop:
	mei_stop(dev);
release_irq:
	mei_cancel_work(dev);
	mei_disable_interrupts(dev);
	free_irq(pdev->irq, dev);
end:
	dev_err(&pdev->dev, "initialization failed.\n");
	return err;
}

/**
 * mei_txe_shutdown- Device Shutdown Routine
 *
 * @pdev: PCI device structure
 *
 *  mei_txe_shutdown is called from the reboot notifier
 *  it's a simplified version of remove so we go down
 *  faster.
 */
static void mei_txe_shutdown(struct pci_dev *pdev)
{
	struct mei_device *dev;

	dev = pci_get_drvdata(pdev);
	if (!dev)
		return;

	dev_dbg(&pdev->dev, "shutdown\n");
	mei_stop(dev);

	mei_txe_unset_pm_domain(dev);

	mei_disable_interrupts(dev);
	free_irq(pdev->irq, dev);
}

/**
 * mei_txe_remove - Device Removal Routine
 *
 * @pdev: PCI device structure
 *
 * mei_remove is called by the PCI subsystem to alert the driver
 * that it should release a PCI device.
 */
static void mei_txe_remove(struct pci_dev *pdev)
{
	struct mei_device *dev;

	dev = pci_get_drvdata(pdev);
	if (!dev) {
		dev_err(&pdev->dev, "mei: dev == NULL\n");
		return;
	}

	pm_runtime_get_noresume(&pdev->dev);

	mei_stop(dev);

	mei_txe_unset_pm_domain(dev);

	mei_disable_interrupts(dev);
	free_irq(pdev->irq, dev);

	mei_deregister(dev);
}


#ifdef CONFIG_PM_SLEEP
static int mei_txe_pci_suspend(struct device *device)
{
	struct pci_dev *pdev = to_pci_dev(device);
	struct mei_device *dev = pci_get_drvdata(pdev);

	if (!dev)
		return -ENODEV;

	dev_dbg(&pdev->dev, "suspend\n");

	mei_stop(dev);

	mei_disable_interrupts(dev);

	free_irq(pdev->irq, dev);
	pci_disable_msi(pdev);

	return 0;
}

static int mei_txe_pci_resume(struct device *device)
{
	struct pci_dev *pdev = to_pci_dev(device);
	struct mei_device *dev;
	int err;

	dev = pci_get_drvdata(pdev);
	if (!dev)
		return -ENODEV;

	pci_enable_msi(pdev);

	mei_clear_interrupts(dev);

	/* request and enable interrupt */
	if (pci_dev_msi_enabled(pdev))
		err = request_threaded_irq(pdev->irq,
			NULL,
			mei_txe_irq_thread_handler,
			IRQF_ONESHOT, KBUILD_MODNAME, dev);
	else
		err = request_threaded_irq(pdev->irq,
			mei_txe_irq_quick_handler,
			mei_txe_irq_thread_handler,
			IRQF_SHARED, KBUILD_MODNAME, dev);
	if (err) {
		dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
				pdev->irq);
		return err;
	}

	err = mei_restart(dev);

	return err;
}
#endif /* CONFIG_PM_SLEEP */

#ifdef CONFIG_PM
static int mei_txe_pm_runtime_idle(struct device *device)
{
	struct mei_device *dev;

	dev_dbg(device, "rpm: txe: runtime_idle\n");

	dev = dev_get_drvdata(device);
	if (!dev)
		return -ENODEV;
	if (mei_write_is_idle(dev))
		pm_runtime_autosuspend(device);

	return -EBUSY;
}
static int mei_txe_pm_runtime_suspend(struct device *device)
{
	struct mei_device *dev;
	int ret;

	dev_dbg(device, "rpm: txe: runtime suspend\n");

	dev = dev_get_drvdata(device);
	if (!dev)
		return -ENODEV;

	mutex_lock(&dev->device_lock);

	if (mei_write_is_idle(dev))
		ret = mei_txe_aliveness_set_sync(dev, 0);
	else
		ret = -EAGAIN;

	/* keep irq on we are staying in D0 */

	dev_dbg(device, "rpm: txe: runtime suspend ret=%d\n", ret);

	mutex_unlock(&dev->device_lock);

	if (ret && ret != -EAGAIN)
		schedule_work(&dev->reset_work);

	return ret;
}

static int mei_txe_pm_runtime_resume(struct device *device)
{
	struct mei_device *dev;
	int ret;

	dev_dbg(device, "rpm: txe: runtime resume\n");

	dev = dev_get_drvdata(device);
	if (!dev)
		return -ENODEV;

	mutex_lock(&dev->device_lock);

	mei_enable_interrupts(dev);

	ret = mei_txe_aliveness_set_sync(dev, 1);

	mutex_unlock(&dev->device_lock);

	dev_dbg(device, "rpm: txe: runtime resume ret = %d\n", ret);

	if (ret)
		schedule_work(&dev->reset_work);

	return ret;
}

/**
 * mei_txe_set_pm_domain - fill and set pm domain structure for device
 *
 * @dev: mei_device
 */
static inline void mei_txe_set_pm_domain(struct mei_device *dev)
{
	struct pci_dev *pdev  = to_pci_dev(dev->dev);

	if (pdev->dev.bus && pdev->dev.bus->pm) {
		dev->pg_domain.ops = *pdev->dev.bus->pm;

		dev->pg_domain.ops.runtime_suspend = mei_txe_pm_runtime_suspend;
		dev->pg_domain.ops.runtime_resume = mei_txe_pm_runtime_resume;
		dev->pg_domain.ops.runtime_idle = mei_txe_pm_runtime_idle;

		dev_pm_domain_set(&pdev->dev, &dev->pg_domain);
	}
}

/**
 * mei_txe_unset_pm_domain - clean pm domain structure for device
 *
 * @dev: mei_device
 */
static inline void mei_txe_unset_pm_domain(struct mei_device *dev)
{
	/* stop using pm callbacks if any */
	dev_pm_domain_set(dev->dev, NULL);
}

static const struct dev_pm_ops mei_txe_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(mei_txe_pci_suspend,
				mei_txe_pci_resume)
	SET_RUNTIME_PM_OPS(
		mei_txe_pm_runtime_suspend,
		mei_txe_pm_runtime_resume,
		mei_txe_pm_runtime_idle)
};

#define MEI_TXE_PM_OPS	(&mei_txe_pm_ops)
#else
#define MEI_TXE_PM_OPS	NULL
#endif /* CONFIG_PM */

/*
 *  PCI driver structure
 */
static struct pci_driver mei_txe_driver = {
	.name = KBUILD_MODNAME,
	.id_table = mei_txe_pci_tbl,
	.probe = mei_txe_probe,
	.remove = mei_txe_remove,
	.shutdown = mei_txe_shutdown,
	.driver.pm = MEI_TXE_PM_OPS,
};

module_pci_driver(mei_txe_driver);

MODULE_AUTHOR("Intel Corporation");
MODULE_DESCRIPTION("Intel(R) Trusted Execution Environment Interface");
MODULE_LICENSE("GPL v2");