summaryrefslogtreecommitdiffstats
path: root/drivers/hid/intel-ish-hid/ipc/pci-ish.c
blob: 42f0beeb09fd4e2ab4fe6ad246f9f21786bf3e3d (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
/*
 * PCI glue for ISHTP provider device (ISH) driver
 *
 * Copyright (c) 2014-2016, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 */

#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/interrupt.h>
#include <linux/workqueue.h>
#include <linux/miscdevice.h>
#define CREATE_TRACE_POINTS
#include <trace/events/intel_ish.h>
#include "ishtp-dev.h"
#include "hw-ish.h"

static const struct pci_device_id ish_pci_tbl[] = {
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, CHV_DEVICE_ID)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Ax_DEVICE_ID)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Bx_DEVICE_ID)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, APL_Ax_DEVICE_ID)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, SPT_Ax_DEVICE_ID)},
	{0, }
};
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 void ish_event_tracer(struct ishtp_device *dev, 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;
}

/**
 * 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)
{
	struct ishtp_device *dev;
	struct ish_hw *hw;
	int	ret;

	/* enable pci dev */
	ret = pci_enable_device(pdev);
	if (ret) {
		dev_err(&pdev->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 = pci_request_regions(pdev, KBUILD_MODNAME);
	if (ret) {
		dev_err(&pdev->dev, "ISH: Failed to get PCI regions\n");
		goto disable_device;
	}

	/* allocates and initializes the ISH dev structure */
	dev = ish_dev_init(pdev);
	if (!dev) {
		ret = -ENOMEM;
		goto release_regions;
	}
	hw = to_ish_hw(dev);
	dev->print_log = ish_event_tracer;

	/* mapping IO device memory */
	hw->mem_addr = pci_iomap(pdev, 0, 0);
	if (!hw->mem_addr) {
		dev_err(&pdev->dev, "ISH: mapping I/O range failure\n");
		ret = -ENOMEM;
		goto free_device;
	}

	dev->pdev = pdev;

	pdev->dev_flags |= PCI_DEV_FLAGS_NO_D3;

	/* request and enable interrupt */
	ret = request_irq(pdev->irq, ish_irq_handler, IRQF_NO_SUSPEND,
			  KBUILD_MODNAME, dev);
	if (ret) {
		dev_err(&pdev->dev, "ISH: request IRQ failure (%d)\n",
			pdev->irq);
		goto free_device;
	}

	dev_set_drvdata(dev->devc, dev);

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

	ret = ish_init(dev);
	if (ret)
		goto free_irq;

	return 0;

free_irq:
	free_irq(pdev->irq, dev);
free_device:
	pci_iounmap(pdev, hw->mem_addr);
	kfree(dev);
release_regions:
	pci_release_regions(pdev);
disable_device:
	pci_clear_master(pdev);
	pci_disable_device(pdev);
	dev_err(&pdev->dev, "ISH: PCI driver initialization failed.\n");

	return ret;
}

/**
 * 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);
	struct ish_hw *hw = to_ish_hw(ishtp_dev);

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

	free_irq(pdev->irq, ishtp_dev);
	pci_iounmap(pdev, hw->mem_addr);
	pci_release_regions(pdev);
	pci_clear_master(pdev);
	pci_disable_device(pdev);
	kfree(ishtp_dev);
}

static struct device *ish_resume_device;

/**
 * ish_resume_handler() - Work function to complete resume
 * @work:	work struct
 *
 * The resume work function to complete resume function asynchronously.
 * There are two types of platforms, one where ISH is not powered off,
 * in that case a simple resume message is enough, others we need
 * a reset sequence.
 */
static void 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);
	int ret;

	ishtp_send_resume(dev);

	/* 50 ms to get resume response */
	if (dev->resume_flag)
		ret = wait_event_interruptible_timeout(dev->resume_wait,
						       !dev->resume_flag,
						       msecs_to_jiffies(50));

	/*
	 * If no resume response. This platform  is not S0ix compatible
	 * So on resume full reboot of ISH processor will happen, so
	 * need to go through init sequence again
	 */
	if (dev->resume_flag)
		ish_init(dev);
}

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

	enable_irq_wake(pdev->irq);
	/*
	 * 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));

	return 0;
}

static 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 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;

	disable_irq_wake(pdev->irq);
	schedule_work(&resume_work);

	return 0;
}

#ifdef CONFIG_PM
static const struct dev_pm_ops ish_pm_ops = {
	.suspend = ish_suspend,
	.resume = ish_resume,
};
#define ISHTP_ISH_PM_OPS	(&ish_pm_ops)
#else
#define ISHTP_ISH_PM_OPS	NULL
#endif

static struct pci_driver ish_driver = {
	.name = KBUILD_MODNAME,
	.id_table = ish_pci_tbl,
	.probe = ish_probe,
	.remove = ish_remove,
	.driver.pm = ISHTP_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");