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)},
40 MODULE_DEVICE_TABLE(pci, ish_pci_tbl);
43 * ish_event_tracer() - Callback function to dump trace messages
45 * @format: printf style format
47 * Callback to direct log messages to Linux trace buffers
49 static void ish_event_tracer(struct ishtp_device *dev, char *format, ...)
51 if (trace_ishtp_dump_enabled()) {
55 va_start(args, format);
56 vsnprintf(tmp_buf, sizeof(tmp_buf), format, args);
59 trace_ishtp_dump(tmp_buf);
64 * ish_init() - Init function
67 * This function initialize wait queues for suspend/resume and call
68 * calls hadware initialization function. This will initiate
71 * Return: 0 for success or error code for failure
73 static int ish_init(struct ishtp_device *dev)
77 /* Set the state of ISH HW to start */
78 ret = ish_hw_start(dev);
80 dev_err(dev->devc, "ISH: hw start failed.\n");
84 /* Start the inter process communication to ISH processor */
85 ret = ishtp_start(dev);
87 dev_err(dev->devc, "ISHTP: Protocol init failed.\n");
95 * ish_probe() - PCI driver probe callback
99 * Initialize PCI function, setup interrupt and call for ISH initialization
101 * Return: 0 for success or error code for failure
103 static int ish_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
105 struct ishtp_device *dev;
110 ret = pci_enable_device(pdev);
112 dev_err(&pdev->dev, "ISH: Failed to enable PCI device\n");
116 /* set PCI host mastering */
117 pci_set_master(pdev);
119 /* pci request regions for ISH driver */
120 ret = pci_request_regions(pdev, KBUILD_MODNAME);
122 dev_err(&pdev->dev, "ISH: Failed to get PCI regions\n");
126 /* allocates and initializes the ISH dev structure */
127 dev = ish_dev_init(pdev);
130 goto release_regions;
133 dev->print_log = ish_event_tracer;
135 /* mapping IO device memory */
136 hw->mem_addr = pci_iomap(pdev, 0, 0);
138 dev_err(&pdev->dev, "ISH: mapping I/O range failure\n");
145 pdev->dev_flags |= PCI_DEV_FLAGS_NO_D3;
147 /* request and enable interrupt */
148 ret = request_irq(pdev->irq, ish_irq_handler, IRQF_SHARED,
149 KBUILD_MODNAME, dev);
151 dev_err(&pdev->dev, "ISH: request IRQ failure (%d)\n",
156 dev_set_drvdata(dev->devc, dev);
158 init_waitqueue_head(&dev->suspend_wait);
159 init_waitqueue_head(&dev->resume_wait);
168 free_irq(pdev->irq, dev);
170 pci_iounmap(pdev, hw->mem_addr);
173 pci_release_regions(pdev);
175 pci_clear_master(pdev);
176 pci_disable_device(pdev);
177 dev_err(&pdev->dev, "ISH: PCI driver initialization failed.\n");
183 * ish_remove() - PCI driver remove callback
186 * This function does cleanup of ISH on pci remove callback
188 static void ish_remove(struct pci_dev *pdev)
190 struct ishtp_device *ishtp_dev = pci_get_drvdata(pdev);
191 struct ish_hw *hw = to_ish_hw(ishtp_dev);
193 ishtp_bus_remove_all_clients(ishtp_dev, false);
194 ish_device_disable(ishtp_dev);
196 free_irq(pdev->irq, ishtp_dev);
197 pci_iounmap(pdev, hw->mem_addr);
198 pci_release_regions(pdev);
199 pci_clear_master(pdev);
200 pci_disable_device(pdev);
205 static struct device *ish_resume_device;
208 * ish_resume_handler() - Work function to complete resume
211 * The resume work function to complete resume function asynchronously.
212 * There are two types of platforms, one where ISH is not powered off,
213 * in that case a simple resume message is enough, others we need
216 static void ish_resume_handler(struct work_struct *work)
218 struct pci_dev *pdev = to_pci_dev(ish_resume_device);
219 struct ishtp_device *dev = pci_get_drvdata(pdev);
222 ishtp_send_resume(dev);
224 /* 50 ms to get resume response */
225 if (dev->resume_flag)
226 ret = wait_event_interruptible_timeout(dev->resume_wait,
228 msecs_to_jiffies(50));
231 * If no resume response. This platform is not S0ix compatible
232 * So on resume full reboot of ISH processor will happen, so
233 * need to go through init sequence again
235 if (dev->resume_flag)
240 * ish_suspend() - ISH suspend callback
241 * @device: device pointer
243 * ISH suspend callback
245 * Return: 0 to the pm core
247 static int ish_suspend(struct device *device)
249 struct pci_dev *pdev = to_pci_dev(device);
250 struct ishtp_device *dev = pci_get_drvdata(pdev);
252 enable_irq_wake(pdev->irq);
254 * If previous suspend hasn't been asnwered then ISH is likely dead,
255 * don't attempt nested notification
257 if (dev->suspend_flag)
260 dev->resume_flag = 0;
261 dev->suspend_flag = 1;
262 ishtp_send_suspend(dev);
264 /* 25 ms should be enough for live ISH to flush all IPC buf */
265 if (dev->suspend_flag)
266 wait_event_interruptible_timeout(dev->suspend_wait,
268 msecs_to_jiffies(25));
273 static DECLARE_WORK(resume_work, ish_resume_handler);
275 * ish_resume() - ISH resume callback
276 * @device: device pointer
278 * ISH resume callback
280 * Return: 0 to the pm core
282 static int ish_resume(struct device *device)
284 struct pci_dev *pdev = to_pci_dev(device);
285 struct ishtp_device *dev = pci_get_drvdata(pdev);
287 ish_resume_device = device;
288 dev->resume_flag = 1;
290 disable_irq_wake(pdev->irq);
291 schedule_work(&resume_work);
296 static const struct dev_pm_ops ish_pm_ops = {
297 .suspend = ish_suspend,
298 .resume = ish_resume,
300 #define ISHTP_ISH_PM_OPS (&ish_pm_ops)
302 #define ISHTP_ISH_PM_OPS NULL
303 #endif /* CONFIG_PM */
305 static struct pci_driver ish_driver = {
306 .name = KBUILD_MODNAME,
307 .id_table = ish_pci_tbl,
309 .remove = ish_remove,
310 .driver.pm = ISHTP_ISH_PM_OPS,
313 module_pci_driver(ish_driver);
315 /* Original author */
316 MODULE_AUTHOR("Daniel Drubin <daniel.drubin@intel.com>");
317 /* Adoption to upstream Linux kernel */
318 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
320 MODULE_DESCRIPTION("Intel(R) Integrated Sensor Hub PCI Device Driver");
321 MODULE_LICENSE("GPL");