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)
ish_event_tracer(struct ishtp_device * dev,const char * format,...)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 */
ish_init(struct ishtp_device * dev)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
ish_should_enter_d0i3(struct pci_dev * pdev)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
ish_should_leave_d0i3(struct pci_dev * pdev)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
enable_gpe(struct device * dev)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
enable_pme_wake(struct pci_dev * pdev)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 */
ish_probe(struct pci_dev * pdev,const struct pci_device_id * ent)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 */
ish_remove(struct pci_dev * pdev)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 */
ish_resume_handler(struct work_struct * work)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 */
ish_suspend(struct device * device)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 */
ish_resume(struct device * device)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