drivers/hid/intel-ish-hid/ipc/pci-ish.c

   1 /*
   2  * PCI glue for ISHTP provider device (ISH) driver
   3  *
   4  * Copyright (c) 2014-2016, Intel Corporation.
   5  *
   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.
   9  *
  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
  13  * more details.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/moduleparam.h>
  18 #include <linux/kernel.h>
  19 #include <linux/device.h>
  20 #include <linux/fs.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"
  30 #include "hw-ish.h"
  31
  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         {0, }
  41 };
  42 MODULE_DEVICE_TABLE(pci, ish_pci_tbl);
  43
  44 /**
  45  * ish_event_tracer() - Callback function to dump trace messages
  46  * @dev:        ishtp device
  47  * @format:     printf style format
  48  *
  49  * Callback to direct log messages to Linux trace buffers
  50  */
  51 static __printf(2, 3)
  52 void ish_event_tracer(struct ishtp_device *dev, const char *format, ...)
  53 {
  54         if (trace_ishtp_dump_enabled()) {
  55                 va_list args;
  56                 char tmp_buf[100];
  57
  58                 va_start(args, format);
  59                 vsnprintf(tmp_buf, sizeof(tmp_buf), format, args);
  60                 va_end(args);
  61
  62                 trace_ishtp_dump(tmp_buf);
  63         }
  64 }
  65
  66 /**
  67  * ish_init() - Init function
  68  * @dev:        ishtp device
  69  *
  70  * This function initialize wait queues for suspend/resume and call
  71  * calls hadware initialization function. This will initiate
  72  * startup sequence
  73  *
  74  * Return: 0 for success or error code for failure
  75  */
  76 static int ish_init(struct ishtp_device *dev)
  77 {
  78         int ret;
  79
  80         /* Set the state of ISH HW to start */
  81         ret = ish_hw_start(dev);
  82         if (ret) {
  83                 dev_err(dev->devc, "ISH: hw start failed.\n");
  84                 return ret;
  85         }
  86
  87         /* Start the inter process communication to ISH processor */
  88         ret = ishtp_start(dev);
  89         if (ret) {
  90                 dev_err(dev->devc, "ISHTP: Protocol init failed.\n");
  91                 return ret;
  92         }
  93
  94         return 0;
  95 }
  96
  97 /**
  98  * ish_probe() - PCI driver probe callback
  99  * @pdev:       pci device
 100  * @ent:        pci device id
 101  *
 102  * Initialize PCI function, setup interrupt and call for ISH initialization
 103  *
 104  * Return: 0 for success or error code for failure
 105  */
 106 static int ish_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 107 {
 108         struct ishtp_device *dev;
 109         struct ish_hw *hw;
 110         int     ret;
 111
 112         /* enable pci dev */
 113         ret = pci_enable_device(pdev);
 114         if (ret) {
 115                 dev_err(&pdev->dev, "ISH: Failed to enable PCI device\n");
 116                 return ret;
 117         }
 118
 119         /* set PCI host mastering */
 120         pci_set_master(pdev);
 121
 122         /* pci request regions for ISH driver */
 123         ret = pci_request_regions(pdev, KBUILD_MODNAME);
 124         if (ret) {
 125                 dev_err(&pdev->dev, "ISH: Failed to get PCI regions\n");
 126                 goto disable_device;
 127         }
 128
 129         /* allocates and initializes the ISH dev structure */
 130         dev = ish_dev_init(pdev);
 131         if (!dev) {
 132                 ret = -ENOMEM;
 133                 goto release_regions;
 134         }
 135         hw = to_ish_hw(dev);
 136         dev->print_log = ish_event_tracer;
 137
 138         /* mapping IO device memory */
 139         hw->mem_addr = pci_iomap(pdev, 0, 0);
 140         if (!hw->mem_addr) {
 141                 dev_err(&pdev->dev, "ISH: mapping I/O range failure\n");
 142                 ret = -ENOMEM;
 143                 goto free_device;
 144         }
 145
 146         dev->pdev = pdev;
 147
 148         pdev->dev_flags |= PCI_DEV_FLAGS_NO_D3;
 149
 150         /* request and enable interrupt */
 151         ret = request_irq(pdev->irq, ish_irq_handler, IRQF_SHARED,
 152                           KBUILD_MODNAME, dev);
 153         if (ret) {
 154                 dev_err(&pdev->dev, "ISH: request IRQ failure (%d)\n",
 155                         pdev->irq);
 156                 goto free_device;
 157         }
 158
 159         dev_set_drvdata(dev->devc, dev);
 160
 161         init_waitqueue_head(&dev->suspend_wait);
 162         init_waitqueue_head(&dev->resume_wait);
 163
 164         ret = ish_init(dev);
 165         if (ret)
 166                 goto free_irq;
 167
 168         return 0;
 169
 170 free_irq:
 171         free_irq(pdev->irq, dev);
 172 free_device:
 173         pci_iounmap(pdev, hw->mem_addr);
 174         kfree(dev);
 175 release_regions:
 176         pci_release_regions(pdev);
 177 disable_device:
 178         pci_clear_master(pdev);
 179         pci_disable_device(pdev);
 180         dev_err(&pdev->dev, "ISH: PCI driver initialization failed.\n");
 181
 182         return ret;
 183 }
 184
 185 /**
 186  * ish_remove() - PCI driver remove callback
 187  * @pdev:       pci device
 188  *
 189  * This function does cleanup of ISH on pci remove callback
 190  */
 191 static void ish_remove(struct pci_dev *pdev)
 192 {
 193         struct ishtp_device *ishtp_dev = pci_get_drvdata(pdev);
 194         struct ish_hw *hw = to_ish_hw(ishtp_dev);
 195
 196         ishtp_bus_remove_all_clients(ishtp_dev, false);
 197         ish_device_disable(ishtp_dev);
 198
 199         free_irq(pdev->irq, ishtp_dev);
 200         pci_iounmap(pdev, hw->mem_addr);
 201         pci_release_regions(pdev);
 202         pci_clear_master(pdev);
 203         pci_disable_device(pdev);
 204         kfree(ishtp_dev);
 205 }
 206
 207 #ifdef CONFIG_PM
 208 static struct device *ish_resume_device;
 209
 210 /* 50ms to get resume response */
 211 #define WAIT_FOR_RESUME_ACK_MS          50
 212
 213 /**
 214  * ish_resume_handler() - Work function to complete resume
 215  * @work:       work struct
 216  *
 217  * The resume work function to complete resume function asynchronously.
 218  * There are two resume paths, one where ISH is not powered off,
 219  * in that case a simple resume message is enough, others we need
 220  * a reset sequence.
 221  */
 222 static void ish_resume_handler(struct work_struct *work)
 223 {
 224         struct pci_dev *pdev = to_pci_dev(ish_resume_device);
 225         struct ishtp_device *dev = pci_get_drvdata(pdev);
 226         uint32_t fwsts;
 227         int ret;
 228
 229         /* Get ISH FW status */
 230         fwsts = IPC_GET_ISH_FWSTS(dev->ops->get_fw_status(dev));
 231
 232         /*
 233          * If currently, in ISH FW, sensor app is loaded or beyond that,
 234          * it means ISH isn't powered off, in this case, send a resume message.
 235          */
 236         if (fwsts >= FWSTS_SENSOR_APP_LOADED) {
 237                 ishtp_send_resume(dev);
 238
 239                 /* Waiting to get resume response */
 240                 if (dev->resume_flag)
 241                         ret = wait_event_interruptible_timeout(dev->resume_wait,
 242                                 !dev->resume_flag,
 243                                 msecs_to_jiffies(WAIT_FOR_RESUME_ACK_MS));
 244         }
 245
 246         /*
 247          * If in ISH FW, sensor app isn't loaded yet, or no resume response.
 248          * That means this platform is not S0ix compatible, or something is
 249          * wrong with ISH FW. So on resume, full reboot of ISH processor will
 250          * happen, so need to go through init sequence again.
 251          */
 252         if (dev->resume_flag)
 253                 ish_init(dev);
 254 }
 255
 256 /**
 257  * ish_suspend() - ISH suspend callback
 258  * @device:     device pointer
 259  *
 260  * ISH suspend callback
 261  *
 262  * Return: 0 to the pm core
 263  */
 264 static int ish_suspend(struct device *device)
 265 {
 266         struct pci_dev *pdev = to_pci_dev(device);
 267         struct ishtp_device *dev = pci_get_drvdata(pdev);
 268
 269         enable_irq_wake(pdev->irq);
 270         /*
 271          * If previous suspend hasn't been asnwered then ISH is likely dead,
 272          * don't attempt nested notification
 273          */
 274         if (dev->suspend_flag)
 275                 return  0;
 276
 277         dev->resume_flag = 0;
 278         dev->suspend_flag = 1;
 279         ishtp_send_suspend(dev);
 280
 281         /* 25 ms should be enough for live ISH to flush all IPC buf */
 282         if (dev->suspend_flag)
 283                 wait_event_interruptible_timeout(dev->suspend_wait,
 284                                                  !dev->suspend_flag,
 285                                                   msecs_to_jiffies(25));
 286
 287         return 0;
 288 }
 289
 290 static DECLARE_WORK(resume_work, ish_resume_handler);
 291 /**
 292  * ish_resume() - ISH resume callback
 293  * @device:     device pointer
 294  *
 295  * ISH resume callback
 296  *
 297  * Return: 0 to the pm core
 298  */
 299 static int ish_resume(struct device *device)
 300 {
 301         struct pci_dev *pdev = to_pci_dev(device);
 302         struct ishtp_device *dev = pci_get_drvdata(pdev);
 303
 304         ish_resume_device = device;
 305         dev->resume_flag = 1;
 306
 307         disable_irq_wake(pdev->irq);
 308         schedule_work(&resume_work);
 309
 310         return 0;
 311 }
 312
 313 static const struct dev_pm_ops ish_pm_ops = {
 314         .suspend = ish_suspend,
 315         .resume = ish_resume,
 316 };
 317 #define ISHTP_ISH_PM_OPS        (&ish_pm_ops)
 318 #else
 319 #define ISHTP_ISH_PM_OPS        NULL
 320 #endif /* CONFIG_PM */
 321
 322 static struct pci_driver ish_driver = {
 323         .name = KBUILD_MODNAME,
 324         .id_table = ish_pci_tbl,
 325         .probe = ish_probe,
 326         .remove = ish_remove,
 327         .driver.pm = ISHTP_ISH_PM_OPS,
 328 };
 329
 330 module_pci_driver(ish_driver);
 331
 332 /* Original author */
 333 MODULE_AUTHOR("Daniel Drubin <daniel.drubin@intel.com>");
 334 /* Adoption to upstream Linux kernel */
 335 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 336
 337 MODULE_DESCRIPTION("Intel(R) Integrated Sensor Hub PCI Device Driver");
 338 MODULE_LICENSE("GPL");