1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * PCI glue for ISHTP provider device (ISH) driver
4  *
5  * Copyright (c) 2014-2016, Intel Corporation.
6  */
7 
8 #include <linux/acpi.h>
9 #include <linux/module.h>
10 #include <linux/moduleparam.h>
11 #include <linux/kernel.h>
12 #include <linux/device.h>
13 #include <linux/fs.h>
14 #include <linux/errno.h>
15 #include <linux/types.h>
16 #include <linux/pci.h>
17 #include <linux/sched.h>
18 #include <linux/suspend.h>
19 #include <linux/interrupt.h>
20 #include <linux/workqueue.h>
21 #define CREATE_TRACE_POINTS
22 #include <trace/events/intel_ish.h>
23 #include "ishtp-dev.h"
24 #include "hw-ish.h"
25 
26 static const struct pci_device_id ish_pci_tbl[] = {
27 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, CHV_DEVICE_ID)},
28 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Ax_DEVICE_ID)},
29 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Bx_DEVICE_ID)},
30 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, APL_Ax_DEVICE_ID)},
31 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, SPT_Ax_DEVICE_ID)},
32 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, CNL_Ax_DEVICE_ID)},
33 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, GLK_Ax_DEVICE_ID)},
34 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, CNL_H_DEVICE_ID)},
35 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, ICL_MOBILE_DEVICE_ID)},
36 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, SPT_H_DEVICE_ID)},
37 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, CML_LP_DEVICE_ID)},
38 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, CMP_H_DEVICE_ID)},
39 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, EHL_Ax_DEVICE_ID)},
40 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, TGL_LP_DEVICE_ID)},
41 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, TGL_H_DEVICE_ID)},
42 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, ADL_S_DEVICE_ID)},
43 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, ADL_P_DEVICE_ID)},
44 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, ADL_N_DEVICE_ID)},
45 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, RPL_S_DEVICE_ID)},
46 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MTL_P_DEVICE_ID)},
47 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, ARL_H_DEVICE_ID)},
48 	{0, }
49 };
50 MODULE_DEVICE_TABLE(pci, ish_pci_tbl);
51 
52 /**
53  * ish_event_tracer() - Callback function to dump trace messages
54  * @dev:	ishtp device
55  * @format:	printf style format
56  *
57  * Callback to direct log messages to Linux trace buffers
58  */
59 static __printf(2, 3)
60 void ish_event_tracer(struct ishtp_device *dev, const char *format, ...)
61 {
62 	if (trace_ishtp_dump_enabled()) {
63 		va_list args;
64 		char tmp_buf[100];
65 
66 		va_start(args, format);
67 		vsnprintf(tmp_buf, sizeof(tmp_buf), format, args);
68 		va_end(args);
69 
70 		trace_ishtp_dump(tmp_buf);
71 	}
72 }
73 
74 /**
75  * ish_init() - Init function
76  * @dev:	ishtp device
77  *
78  * This function initialize wait queues for suspend/resume and call
79  * calls hadware initialization function. This will initiate
80  * startup sequence
81  *
82  * Return: 0 for success or error code for failure
83  */
84 static int ish_init(struct ishtp_device *dev)
85 {
86 	int ret;
87 
88 	/* Set the state of ISH HW to start */
89 	ret = ish_hw_start(dev);
90 	if (ret) {
91 		dev_err(dev->devc, "ISH: hw start failed.\n");
92 		return ret;
93 	}
94 
95 	/* Start the inter process communication to ISH processor */
96 	ret = ishtp_start(dev);
97 	if (ret) {
98 		dev_err(dev->devc, "ISHTP: Protocol init failed.\n");
99 		return ret;
100 	}
101 
102 	return 0;
103 }
104 
105 static const struct pci_device_id ish_invalid_pci_ids[] = {
106 	/* Mehlow platform special pci ids */
107 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0xA309)},
108 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0xA30A)},
109 	{}
110 };
111 
112 static inline bool ish_should_enter_d0i3(struct pci_dev *pdev)
113 {
114 	return !pm_suspend_via_firmware() || pdev->device == CHV_DEVICE_ID;
115 }
116 
117 static inline bool ish_should_leave_d0i3(struct pci_dev *pdev)
118 {
119 	return !pm_resume_via_firmware() || pdev->device == CHV_DEVICE_ID;
120 }
121 
122 static int enable_gpe(struct device *dev)
123 {
124 #ifdef CONFIG_ACPI
125 	acpi_status acpi_sts;
126 	struct acpi_device *adev;
127 	struct acpi_device_wakeup *wakeup;
128 
129 	adev = ACPI_COMPANION(dev);
130 	if (!adev) {
131 		dev_err(dev, "get acpi handle failed\n");
132 		return -ENODEV;
133 	}
134 	wakeup = &adev->wakeup;
135 
136 	/*
137 	 * Call acpi_disable_gpe(), so that reference count
138 	 * gpe_event_info->runtime_count doesn't overflow.
139 	 * When gpe_event_info->runtime_count = 0, the call
140 	 * to acpi_disable_gpe() simply return.
141 	 */
142 	acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
143 
144 	acpi_sts = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number);
145 	if (ACPI_FAILURE(acpi_sts)) {
146 		dev_err(dev, "enable ose_gpe failed\n");
147 		return -EIO;
148 	}
149 
150 	return 0;
151 #else
152 	return -ENODEV;
153 #endif
154 }
155 
156 static void enable_pme_wake(struct pci_dev *pdev)
157 {
158 	if ((pci_pme_capable(pdev, PCI_D0) ||
159 	     pci_pme_capable(pdev, PCI_D3hot) ||
160 	     pci_pme_capable(pdev, PCI_D3cold)) && !enable_gpe(&pdev->dev)) {
161 		pci_pme_active(pdev, true);
162 		dev_dbg(&pdev->dev, "ish ipc driver pme wake enabled\n");
163 	}
164 }
165 
166 /**
167  * ish_probe() - PCI driver probe callback
168  * @pdev:	pci device
169  * @ent:	pci device id
170  *
171  * Initialize PCI function, setup interrupt and call for ISH initialization
172  *
173  * Return: 0 for success or error code for failure
174  */
175 static int ish_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
176 {
177 	int ret;
178 	struct ish_hw *hw;
179 	unsigned long irq_flag = 0;
180 	struct ishtp_device *ishtp;
181 	struct device *dev = &pdev->dev;
182 
183 	/* Check for invalid platforms for ISH support */
184 	if (pci_dev_present(ish_invalid_pci_ids))
185 		return -ENODEV;
186 
187 	/* enable pci dev */
188 	ret = pcim_enable_device(pdev);
189 	if (ret) {
190 		dev_err(dev, "ISH: Failed to enable PCI device\n");
191 		return ret;
192 	}
193 
194 	/* set PCI host mastering */
195 	pci_set_master(pdev);
196 
197 	/* pci request regions for ISH driver */
198 	ret = pcim_iomap_regions(pdev, 1 << 0, KBUILD_MODNAME);
199 	if (ret) {
200 		dev_err(dev, "ISH: Failed to get PCI regions\n");
201 		return ret;
202 	}
203 
204 	/* allocates and initializes the ISH dev structure */
205 	ishtp = ish_dev_init(pdev);
206 	if (!ishtp) {
207 		ret = -ENOMEM;
208 		return ret;
209 	}
210 	hw = to_ish_hw(ishtp);
211 	ishtp->print_log = ish_event_tracer;
212 
213 	/* mapping IO device memory */
214 	hw->mem_addr = pcim_iomap_table(pdev)[0];
215 	ishtp->pdev = pdev;
216 
217 	/* request and enable interrupt */
218 	ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
219 	if (!pdev->msi_enabled && !pdev->msix_enabled)
220 		irq_flag = IRQF_SHARED;
221 
222 	ret = devm_request_irq(dev, pdev->irq, ish_irq_handler,
223 			       irq_flag, KBUILD_MODNAME, ishtp);
224 	if (ret) {
225 		dev_err(dev, "ISH: request IRQ %d failed\n", pdev->irq);
226 		return ret;
227 	}
228 
229 	dev_set_drvdata(ishtp->devc, ishtp);
230 
231 	init_waitqueue_head(&ishtp->suspend_wait);
232 	init_waitqueue_head(&ishtp->resume_wait);
233 
234 	/* Enable PME for EHL */
235 	if (pdev->device == EHL_Ax_DEVICE_ID)
236 		enable_pme_wake(pdev);
237 
238 	ret = ish_init(ishtp);
239 	if (ret)
240 		return ret;
241 
242 	return 0;
243 }
244 
245 /**
246  * ish_remove() - PCI driver remove callback
247  * @pdev:	pci device
248  *
249  * This function does cleanup of ISH on pci remove callback
250  */
251 static void ish_remove(struct pci_dev *pdev)
252 {
253 	struct ishtp_device *ishtp_dev = pci_get_drvdata(pdev);
254 
255 	ishtp_bus_remove_all_clients(ishtp_dev, false);
256 	ish_device_disable(ishtp_dev);
257 }
258 
259 static struct device __maybe_unused *ish_resume_device;
260 
261 /* 50ms to get resume response */
262 #define WAIT_FOR_RESUME_ACK_MS		50
263 
264 /**
265  * ish_resume_handler() - Work function to complete resume
266  * @work:	work struct
267  *
268  * The resume work function to complete resume function asynchronously.
269  * There are two resume paths, one where ISH is not powered off,
270  * in that case a simple resume message is enough, others we need
271  * a reset sequence.
272  */
273 static void __maybe_unused ish_resume_handler(struct work_struct *work)
274 {
275 	struct pci_dev *pdev = to_pci_dev(ish_resume_device);
276 	struct ishtp_device *dev = pci_get_drvdata(pdev);
277 	uint32_t fwsts = dev->ops->get_fw_status(dev);
278 
279 	if (ish_should_leave_d0i3(pdev) && !dev->suspend_flag
280 			&& IPC_IS_ISH_ILUP(fwsts)) {
281 		if (device_may_wakeup(&pdev->dev))
282 			disable_irq_wake(pdev->irq);
283 
284 		ish_set_host_ready(dev);
285 
286 		ishtp_send_resume(dev);
287 
288 		/* Waiting to get resume response */
289 		if (dev->resume_flag)
290 			wait_event_interruptible_timeout(dev->resume_wait,
291 				!dev->resume_flag,
292 				msecs_to_jiffies(WAIT_FOR_RESUME_ACK_MS));
293 
294 		/*
295 		 * If the flag is not cleared, something is wrong with ISH FW.
296 		 * So on resume, need to go through init sequence again.
297 		 */
298 		if (dev->resume_flag)
299 			ish_init(dev);
300 	} else {
301 		/*
302 		 * Resume from the D3, full reboot of ISH processor will happen,
303 		 * so need to go through init sequence again.
304 		 */
305 		ish_init(dev);
306 	}
307 }
308 
309 /**
310  * ish_suspend() - ISH suspend callback
311  * @device:	device pointer
312  *
313  * ISH suspend callback
314  *
315  * Return: 0 to the pm core
316  */
317 static int __maybe_unused ish_suspend(struct device *device)
318 {
319 	struct pci_dev *pdev = to_pci_dev(device);
320 	struct ishtp_device *dev = pci_get_drvdata(pdev);
321 
322 	if (ish_should_enter_d0i3(pdev)) {
323 		/*
324 		 * If previous suspend hasn't been asnwered then ISH is likely
325 		 * dead, don't attempt nested notification
326 		 */
327 		if (dev->suspend_flag)
328 			return	0;
329 
330 		dev->resume_flag = 0;
331 		dev->suspend_flag = 1;
332 		ishtp_send_suspend(dev);
333 
334 		/* 25 ms should be enough for live ISH to flush all IPC buf */
335 		if (dev->suspend_flag)
336 			wait_event_interruptible_timeout(dev->suspend_wait,
337 					!dev->suspend_flag,
338 					msecs_to_jiffies(25));
339 
340 		if (dev->suspend_flag) {
341 			/*
342 			 * It looks like FW halt, clear the DMA bit, and put
343 			 * ISH into D3, and FW would reset on resume.
344 			 */
345 			ish_disable_dma(dev);
346 		} else {
347 			/*
348 			 * Save state so PCI core will keep the device at D0,
349 			 * the ISH would enter D0i3
350 			 */
351 			pci_save_state(pdev);
352 
353 			if (device_may_wakeup(&pdev->dev))
354 				enable_irq_wake(pdev->irq);
355 		}
356 	} else {
357 		/*
358 		 * Clear the DMA bit before putting ISH into D3,
359 		 * or ISH FW would reset automatically.
360 		 */
361 		ish_disable_dma(dev);
362 	}
363 
364 	return 0;
365 }
366 
367 static __maybe_unused DECLARE_WORK(resume_work, ish_resume_handler);
368 /**
369  * ish_resume() - ISH resume callback
370  * @device:	device pointer
371  *
372  * ISH resume callback
373  *
374  * Return: 0 to the pm core
375  */
376 static int __maybe_unused ish_resume(struct device *device)
377 {
378 	struct pci_dev *pdev = to_pci_dev(device);
379 	struct ishtp_device *dev = pci_get_drvdata(pdev);
380 
381 	/* add this to finish power flow for EHL */
382 	if (dev->pdev->device == EHL_Ax_DEVICE_ID) {
383 		pci_set_power_state(pdev, PCI_D0);
384 		enable_pme_wake(pdev);
385 		dev_dbg(dev->devc, "set power state to D0 for ehl\n");
386 	}
387 
388 	ish_resume_device = device;
389 	dev->resume_flag = 1;
390 
391 	schedule_work(&resume_work);
392 
393 	return 0;
394 }
395 
396 static SIMPLE_DEV_PM_OPS(ish_pm_ops, ish_suspend, ish_resume);
397 
398 static struct pci_driver ish_driver = {
399 	.name = KBUILD_MODNAME,
400 	.id_table = ish_pci_tbl,
401 	.probe = ish_probe,
402 	.remove = ish_remove,
403 	.driver.pm = &ish_pm_ops,
404 };
405 
406 module_pci_driver(ish_driver);
407 
408 /* Original author */
409 MODULE_AUTHOR("Daniel Drubin <daniel.drubin@intel.com>");
410 /* Adoption to upstream Linux kernel */
411 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
412 
413 MODULE_DESCRIPTION("Intel(R) Integrated Sensor Hub PCI Device Driver");
414 MODULE_LICENSE("GPL");
415