summaryrefslogtreecommitdiff
path: root/drivers/hid/intel-ish-hid/ipc/pci-ish.c
blob: f82428d7f6c3d7676adb1a6121a1750872e148a2 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * PCI glue for ISHTP provider device (ISH) driver
 *
 * Copyright (c) 2014-2016, Intel Corporation.
 */

#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/sched.h>
#include <linux/suspend.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#define CREATE_TRACE_POINTS
#include <trace/events/intel_ish.h>
#include "ishtp-dev.h"
#include "hw-ish.h"

enum ishtp_driver_data_index {
	ISHTP_DRIVER_DATA_NONE,
	ISHTP_DRIVER_DATA_LNL_M,
};

#define ISH_FW_FILENAME_LNL_M "intel/ish/ish_lnlm.bin"

static struct ishtp_driver_data ishtp_driver_data[] = {
	[ISHTP_DRIVER_DATA_LNL_M] = {
		.fw_filename = ISH_FW_FILENAME_LNL_M,
	},
};

static const struct pci_device_id ish_pci_tbl[] = {
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_CHV)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_BXT_Ax)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_BXT_Bx)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_APL_Ax)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_SPT_Ax)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_CNL_Ax)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_GLK_Ax)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_CNL_H)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_ICL_MOBILE)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_SPT_H)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_CML_LP)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_CMP_H)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_EHL_Ax)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_TGL_LP)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_TGL_H)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_ADL_S)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_ADL_P)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_ADL_N)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_RPL_S)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_MTL_P)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_ARL_H)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_ARL_S)},
	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ISH_LNL_M), .driver_data = ISHTP_DRIVER_DATA_LNL_M},
	{}
};
MODULE_DEVICE_TABLE(pci, ish_pci_tbl);

/**
 * ish_event_tracer() - Callback function to dump trace messages
 * @dev:	ishtp device
 * @format:	printf style format
 *
 * Callback to direct log messages to Linux trace buffers
 */
static __printf(2, 3)
void ish_event_tracer(struct ishtp_device *dev, const char *format, ...)
{
	if (trace_ishtp_dump_enabled()) {
		va_list args;
		char tmp_buf[100];

		va_start(args, format);
		vsnprintf(tmp_buf, sizeof(tmp_buf), format, args);
		va_end(args);

		trace_ishtp_dump(tmp_buf);
	}
}

/**
 * ish_init() - Init function
 * @dev:	ishtp device
 *
 * This function initialize wait queues for suspend/resume and call
 * calls hadware initialization function. This will initiate
 * startup sequence
 *
 * Return: 0 for success or error code for failure
 */
static int ish_init(struct ishtp_device *dev)
{
	int ret;

	/* Set the state of ISH HW to start */
	ret = ish_hw_start(dev);
	if (ret) {
		dev_err(dev->devc, "ISH: hw start failed.\n");
		return ret;
	}

	/* Start the inter process communication to ISH processor */
	ret = ishtp_start(dev);
	if (ret) {
		dev_err(dev->devc, "ISHTP: Protocol init failed.\n");
		return ret;
	}

	return 0;
}

static const struct pci_device_id ish_invalid_pci_ids[] = {
	/* Mehlow platform special pci ids */
	{PCI_VDEVICE(INTEL, 0xA309)},
	{PCI_VDEVICE(INTEL, 0xA30A)},
	{}
};

static inline bool ish_should_enter_d0i3(struct pci_dev *pdev)
{
	return !pm_suspend_via_firmware() || pdev->device == PCI_DEVICE_ID_INTEL_ISH_CHV;
}

static inline bool ish_should_leave_d0i3(struct pci_dev *pdev)
{
	return !pm_resume_via_firmware() || pdev->device == PCI_DEVICE_ID_INTEL_ISH_CHV;
}

/**
 * ish_probe() - PCI driver probe callback
 * @pdev:	pci device
 * @ent:	pci device id
 *
 * Initialize PCI function, setup interrupt and call for ISH initialization
 *
 * Return: 0 for success or error code for failure
 */
static int ish_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	int ret;
	struct ish_hw *hw;
	unsigned long irq_flag = 0;
	struct ishtp_device *ishtp;
	struct device *dev = &pdev->dev;

	/* Check for invalid platforms for ISH support */
	if (pci_dev_present(ish_invalid_pci_ids))
		return -ENODEV;

	/* enable pci dev */
	ret = pcim_enable_device(pdev);
	if (ret) {
		dev_err(dev, "ISH: Failed to enable PCI device\n");
		return ret;
	}

	/* set PCI host mastering */
	pci_set_master(pdev);

	/* pci request regions for ISH driver */
	ret = pcim_iomap_regions(pdev, 1 << 0, KBUILD_MODNAME);
	if (ret) {
		dev_err(dev, "ISH: Failed to get PCI regions\n");
		return ret;
	}

	/* allocates and initializes the ISH dev structure */
	ishtp = ish_dev_init(pdev);
	if (!ishtp) {
		ret = -ENOMEM;
		return ret;
	}
	hw = to_ish_hw(ishtp);
	ishtp->print_log = ish_event_tracer;
	ishtp->driver_data = &ishtp_driver_data[ent->driver_data];

	/* mapping IO device memory */
	hw->mem_addr = pcim_iomap_table(pdev)[0];
	ishtp->pdev = pdev;

	/* request and enable interrupt */
	ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
	if (ret < 0) {
		dev_err(dev, "ISH: Failed to allocate IRQ vectors\n");
		return ret;
	}

	if (!pdev->msi_enabled && !pdev->msix_enabled)
		irq_flag = IRQF_SHARED;

	ret = devm_request_irq(dev, pdev->irq, ish_irq_handler,
			       irq_flag, KBUILD_MODNAME, ishtp);
	if (ret) {
		dev_err(dev, "ISH: request IRQ %d failed\n", pdev->irq);
		return ret;
	}

	dev_set_drvdata(ishtp->devc, ishtp);

	init_waitqueue_head(&ishtp->suspend_wait);
	init_waitqueue_head(&ishtp->resume_wait);

	/* Enable PME for EHL */
	if (pdev->device == PCI_DEVICE_ID_INTEL_ISH_EHL_Ax)
		device_init_wakeup(dev, true);

	ret = ish_init(ishtp);
	if (ret)
		return ret;

	return 0;
}

/**
 * ish_remove() - PCI driver remove callback
 * @pdev:	pci device
 *
 * This function does cleanup of ISH on pci remove callback
 */
static void ish_remove(struct pci_dev *pdev)
{
	struct ishtp_device *ishtp_dev = pci_get_drvdata(pdev);

	ishtp_bus_remove_all_clients(ishtp_dev, false);
	ish_device_disable(ishtp_dev);
}


/**
 * ish_shutdown() - PCI driver shutdown callback
 * @pdev:	pci device
 *
 * This function sets up wakeup for S5
 */
static void ish_shutdown(struct pci_dev *pdev)
{
	if (pdev->device == PCI_DEVICE_ID_INTEL_ISH_EHL_Ax)
		pci_prepare_to_sleep(pdev);
}

static struct device __maybe_unused *ish_resume_device;

/* 50ms to get resume response */
#define WAIT_FOR_RESUME_ACK_MS		50

/**
 * ish_resume_handler() - Work function to complete resume
 * @work:	work struct
 *
 * The resume work function to complete resume function asynchronously.
 * There are two resume paths, one where ISH is not powered off,
 * in that case a simple resume message is enough, others we need
 * a reset sequence.
 */
static void __maybe_unused ish_resume_handler(struct work_struct *work)
{
	struct pci_dev *pdev = to_pci_dev(ish_resume_device);
	struct ishtp_device *dev = pci_get_drvdata(pdev);
	uint32_t fwsts = dev->ops->get_fw_status(dev);

	if (ish_should_leave_d0i3(pdev) && !dev->suspend_flag
			&& IPC_IS_ISH_ILUP(fwsts)) {
		if (device_may_wakeup(&pdev->dev))
			disable_irq_wake(pdev->irq);

		ish_set_host_ready(dev);

		ishtp_send_resume(dev);

		/* Waiting to get resume response */
		if (dev->resume_flag)
			wait_event_interruptible_timeout(dev->resume_wait,
				!dev->resume_flag,
				msecs_to_jiffies(WAIT_FOR_RESUME_ACK_MS));

		/*
		 * If the flag is not cleared, something is wrong with ISH FW.
		 * So on resume, need to go through init sequence again.
		 */
		if (dev->resume_flag)
			ish_init(dev);
	} else {
		/*
		 * Resume from the D3, full reboot of ISH processor will happen,
		 * so need to go through init sequence again.
		 */
		ish_init(dev);
	}
}

/**
 * ish_suspend() - ISH suspend callback
 * @device:	device pointer
 *
 * ISH suspend callback
 *
 * Return: 0 to the pm core
 */
static int __maybe_unused ish_suspend(struct device *device)
{
	struct pci_dev *pdev = to_pci_dev(device);
	struct ishtp_device *dev = pci_get_drvdata(pdev);

	if (ish_should_enter_d0i3(pdev)) {
		/*
		 * If previous suspend hasn't been asnwered then ISH is likely
		 * dead, don't attempt nested notification
		 */
		if (dev->suspend_flag)
			return	0;

		dev->resume_flag = 0;
		dev->suspend_flag = 1;
		ishtp_send_suspend(dev);

		/* 25 ms should be enough for live ISH to flush all IPC buf */
		if (dev->suspend_flag)
			wait_event_interruptible_timeout(dev->suspend_wait,
					!dev->suspend_flag,
					msecs_to_jiffies(25));

		if (dev->suspend_flag) {
			/*
			 * It looks like FW halt, clear the DMA bit, and put
			 * ISH into D3, and FW would reset on resume.
			 */
			ish_disable_dma(dev);
		} else {
			/*
			 * Save state so PCI core will keep the device at D0,
			 * the ISH would enter D0i3
			 */
			pci_save_state(pdev);

			if (device_may_wakeup(&pdev->dev))
				enable_irq_wake(pdev->irq);
		}
	} else {
		/*
		 * Clear the DMA bit before putting ISH into D3,
		 * or ISH FW would reset automatically.
		 */
		ish_disable_dma(dev);
	}

	return 0;
}

static __maybe_unused DECLARE_WORK(resume_work, ish_resume_handler);
/**
 * ish_resume() - ISH resume callback
 * @device:	device pointer
 *
 * ISH resume callback
 *
 * Return: 0 to the pm core
 */
static int __maybe_unused ish_resume(struct device *device)
{
	struct pci_dev *pdev = to_pci_dev(device);
	struct ishtp_device *dev = pci_get_drvdata(pdev);

	ish_resume_device = device;
	dev->resume_flag = 1;

	schedule_work(&resume_work);

	return 0;
}

static SIMPLE_DEV_PM_OPS(ish_pm_ops, ish_suspend, ish_resume);

static struct pci_driver ish_driver = {
	.name = KBUILD_MODNAME,
	.id_table = ish_pci_tbl,
	.probe = ish_probe,
	.remove = ish_remove,
	.shutdown = ish_shutdown,
	.driver.pm = &ish_pm_ops,
};

module_pci_driver(ish_driver);

/* Original author */
MODULE_AUTHOR("Daniel Drubin <daniel.drubin@intel.com>");
/* Adoption to upstream Linux kernel */
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");

MODULE_DESCRIPTION("Intel(R) Integrated Sensor Hub PCI Device Driver");
MODULE_LICENSE("GPL");

MODULE_FIRMWARE(ISH_FW_FILENAME_LNL_M);