2 * PCI glue for ISHTP provider device (ISH) driver
4 * Copyright (c) 2014-2016, Intel Corporation.
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 #include <linux/module.h>
17 #include <linux/moduleparam.h>
18 #include <linux/kernel.h>
19 #include <linux/device.h>
21 #include <linux/errno.h>
22 #include <linux/types.h>
23 #include <linux/pci.h>
24 #include <linux/sched.h>
25 #include <linux/interrupt.h>
26 #include <linux/workqueue.h>
27 #define CREATE_TRACE_POINTS
28 #include <trace/events/intel_ish.h>
29 #include "ishtp-dev.h"
32 static const struct pci_device_id ish_pci_tbl[] = {
33 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, CHV_DEVICE_ID)},
34 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Ax_DEVICE_ID)},
35 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Bx_DEVICE_ID)},
36 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, APL_Ax_DEVICE_ID)},
37 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, SPT_Ax_DEVICE_ID)},
38 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, CNL_Ax_DEVICE_ID)},
39 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, GLK_Ax_DEVICE_ID)},
40 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, CNL_H_DEVICE_ID)},
43 MODULE_DEVICE_TABLE(pci, ish_pci_tbl);
46 * ish_event_tracer() - Callback function to dump trace messages
48 * @format: printf style format
50 * Callback to direct log messages to Linux trace buffers
53 void ish_event_tracer(struct ishtp_device *dev, const char *format, ...)
55 if (trace_ishtp_dump_enabled()) {
59 va_start(args, format);
60 vsnprintf(tmp_buf, sizeof(tmp_buf), format, args);
63 trace_ishtp_dump(tmp_buf);
68 * ish_init() - Init function
71 * This function initialize wait queues for suspend/resume and call
72 * calls hadware initialization function. This will initiate
75 * Return: 0 for success or error code for failure
77 static int ish_init(struct ishtp_device *dev)
81 /* Set the state of ISH HW to start */
82 ret = ish_hw_start(dev);
84 dev_err(dev->devc, "ISH: hw start failed.\n");
88 /* Start the inter process communication to ISH processor */
89 ret = ishtp_start(dev);
91 dev_err(dev->devc, "ISHTP: Protocol init failed.\n");
99 * ish_probe() - PCI driver probe callback
101 * @ent: pci device id
103 * Initialize PCI function, setup interrupt and call for ISH initialization
105 * Return: 0 for success or error code for failure
107 static int ish_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
109 struct ishtp_device *dev;
114 ret = pci_enable_device(pdev);
116 dev_err(&pdev->dev, "ISH: Failed to enable PCI device\n");
120 /* set PCI host mastering */
121 pci_set_master(pdev);
123 /* pci request regions for ISH driver */
124 ret = pci_request_regions(pdev, KBUILD_MODNAME);
126 dev_err(&pdev->dev, "ISH: Failed to get PCI regions\n");
130 /* allocates and initializes the ISH dev structure */
131 dev = ish_dev_init(pdev);
134 goto release_regions;
137 dev->print_log = ish_event_tracer;
139 /* mapping IO device memory */
140 hw->mem_addr = pci_iomap(pdev, 0, 0);
142 dev_err(&pdev->dev, "ISH: mapping I/O range failure\n");
149 pdev->dev_flags |= PCI_DEV_FLAGS_NO_D3;
151 /* request and enable interrupt */
152 ret = request_irq(pdev->irq, ish_irq_handler, IRQF_SHARED,
153 KBUILD_MODNAME, dev);
155 dev_err(&pdev->dev, "ISH: request IRQ failure (%d)\n",
160 dev_set_drvdata(dev->devc, dev);
162 init_waitqueue_head(&dev->suspend_wait);
163 init_waitqueue_head(&dev->resume_wait);
172 free_irq(pdev->irq, dev);
174 pci_iounmap(pdev, hw->mem_addr);
177 pci_release_regions(pdev);
179 pci_clear_master(pdev);
180 pci_disable_device(pdev);
181 dev_err(&pdev->dev, "ISH: PCI driver initialization failed.\n");
187 * ish_remove() - PCI driver remove callback
190 * This function does cleanup of ISH on pci remove callback
192 static void ish_remove(struct pci_dev *pdev)
194 struct ishtp_device *ishtp_dev = pci_get_drvdata(pdev);
195 struct ish_hw *hw = to_ish_hw(ishtp_dev);
197 ishtp_bus_remove_all_clients(ishtp_dev, false);
198 ish_device_disable(ishtp_dev);
200 free_irq(pdev->irq, ishtp_dev);
201 pci_iounmap(pdev, hw->mem_addr);
202 pci_release_regions(pdev);
203 pci_clear_master(pdev);
204 pci_disable_device(pdev);
209 static struct device *ish_resume_device;
211 /* 50ms to get resume response */
212 #define WAIT_FOR_RESUME_ACK_MS 50
215 * ish_resume_handler() - Work function to complete resume
218 * The resume work function to complete resume function asynchronously.
219 * There are two resume paths, one where ISH is not powered off,
220 * in that case a simple resume message is enough, others we need
223 static void ish_resume_handler(struct work_struct *work)
225 struct pci_dev *pdev = to_pci_dev(ish_resume_device);
226 struct ishtp_device *dev = pci_get_drvdata(pdev);
230 /* Get ISH FW status */
231 fwsts = IPC_GET_ISH_FWSTS(dev->ops->get_fw_status(dev));
234 * If currently, in ISH FW, sensor app is loaded or beyond that,
235 * it means ISH isn't powered off, in this case, send a resume message.
237 if (fwsts >= FWSTS_SENSOR_APP_LOADED) {
238 ishtp_send_resume(dev);
240 /* Waiting to get resume response */
241 if (dev->resume_flag)
242 ret = wait_event_interruptible_timeout(dev->resume_wait,
244 msecs_to_jiffies(WAIT_FOR_RESUME_ACK_MS));
248 * If in ISH FW, sensor app isn't loaded yet, or no resume response.
249 * That means this platform is not S0ix compatible, or something is
250 * wrong with ISH FW. So on resume, full reboot of ISH processor will
251 * happen, so need to go through init sequence again.
253 if (dev->resume_flag)
258 * ish_suspend() - ISH suspend callback
259 * @device: device pointer
261 * ISH suspend callback
263 * Return: 0 to the pm core
265 static int ish_suspend(struct device *device)
267 struct pci_dev *pdev = to_pci_dev(device);
268 struct ishtp_device *dev = pci_get_drvdata(pdev);
270 enable_irq_wake(pdev->irq);
272 * If previous suspend hasn't been asnwered then ISH is likely dead,
273 * don't attempt nested notification
275 if (dev->suspend_flag)
278 dev->resume_flag = 0;
279 dev->suspend_flag = 1;
280 ishtp_send_suspend(dev);
282 /* 25 ms should be enough for live ISH to flush all IPC buf */
283 if (dev->suspend_flag)
284 wait_event_interruptible_timeout(dev->suspend_wait,
286 msecs_to_jiffies(25));
291 static DECLARE_WORK(resume_work, ish_resume_handler);
293 * ish_resume() - ISH resume callback
294 * @device: device pointer
296 * ISH resume callback
298 * Return: 0 to the pm core
300 static int ish_resume(struct device *device)
302 struct pci_dev *pdev = to_pci_dev(device);
303 struct ishtp_device *dev = pci_get_drvdata(pdev);
305 ish_resume_device = device;
306 dev->resume_flag = 1;
308 disable_irq_wake(pdev->irq);
309 schedule_work(&resume_work);
314 static const struct dev_pm_ops ish_pm_ops = {
315 .suspend = ish_suspend,
316 .resume = ish_resume,
318 #define ISHTP_ISH_PM_OPS (&ish_pm_ops)
320 #define ISHTP_ISH_PM_OPS NULL
321 #endif /* CONFIG_PM */
323 static struct pci_driver ish_driver = {
324 .name = KBUILD_MODNAME,
325 .id_table = ish_pci_tbl,
327 .remove = ish_remove,
328 .driver.pm = ISHTP_ISH_PM_OPS,
331 module_pci_driver(ish_driver);
333 /* Original author */
334 MODULE_AUTHOR("Daniel Drubin <daniel.drubin@intel.com>");
335 /* Adoption to upstream Linux kernel */
336 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
338 MODULE_DESCRIPTION("Intel(R) Integrated Sensor Hub PCI Device Driver");
339 MODULE_LICENSE("GPL");