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 #include <linux/miscdevice.h>
  28 #define CREATE_TRACE_POINTS
  29 #include <trace/events/intel_ish.h>
  30 #include "ishtp-dev.h"
  31 #include "hw-ish.h"
  32
  33 static const struct pci_device_id ish_pci_tbl[] = {
  34         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, CHV_DEVICE_ID)},
  35         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Ax_DEVICE_ID)},
  36         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Bx_DEVICE_ID)},
  37         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, APL_Ax_DEVICE_ID)},
  38         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, SPT_Ax_DEVICE_ID)},
  39         {0, }
  40 };
  41 MODULE_DEVICE_TABLE(pci, ish_pci_tbl);
  42
  43 /**
  44  * ish_event_tracer() - Callback function to dump trace messages
  45  * @dev:        ishtp device
  46  * @format:     printf style format
  47  *
  48  * Callback to direct log messages to Linux trace buffers
  49  */
  50 static void ish_event_tracer(struct ishtp_device *dev, char *format, ...)
  51 {
  52         if (trace_ishtp_dump_enabled()) {
  53                 va_list args;
  54                 char tmp_buf[100];
  55
  56                 va_start(args, format);
  57                 vsnprintf(tmp_buf, sizeof(tmp_buf), format, args);
  58                 va_end(args);
  59
  60                 trace_ishtp_dump(tmp_buf);
  61         }
  62 }
  63
  64 /**
  65  * ish_init() - Init function
  66  * @dev:        ishtp device
  67  *
  68  * This function initialize wait queues for suspend/resume and call
  69  * calls hadware initialization function. This will initiate
  70  * startup sequence
  71  *
  72  * Return: 0 for success or error code for failure
  73  */
  74 static int ish_init(struct ishtp_device *dev)
  75 {
  76         int ret;
  77
  78         /* Set the state of ISH HW to start */
  79         ret = ish_hw_start(dev);
  80         if (ret) {
  81                 dev_err(dev->devc, "ISH: hw start failed.\n");
  82                 return ret;
  83         }
  84
  85         /* Start the inter process communication to ISH processor */
  86         ret = ishtp_start(dev);
  87         if (ret) {
  88                 dev_err(dev->devc, "ISHTP: Protocol init failed.\n");
  89                 return ret;
  90         }
  91
  92         return 0;
  93 }
  94
  95 /**
  96  * ish_probe() - PCI driver probe callback
  97  * @pdev:       pci device
  98  * @ent:        pci device id
  99  *
 100  * Initialize PCI function, setup interrupt and call for ISH initialization
 101  *
 102  * Return: 0 for success or error code for failure
 103  */
 104 static int ish_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 105 {
 106         struct ishtp_device *dev;
 107         struct ish_hw *hw;
 108         int     ret;
 109
 110         /* enable pci dev */
 111         ret = pci_enable_device(pdev);
 112         if (ret) {
 113                 dev_err(&pdev->dev, "ISH: Failed to enable PCI device\n");
 114                 return ret;
 115         }
 116
 117         /* set PCI host mastering */
 118         pci_set_master(pdev);
 119
 120         /* pci request regions for ISH driver */
 121         ret = pci_request_regions(pdev, KBUILD_MODNAME);
 122         if (ret) {
 123                 dev_err(&pdev->dev, "ISH: Failed to get PCI regions\n");
 124                 goto disable_device;
 125         }
 126
 127         /* allocates and initializes the ISH dev structure */
 128         dev = ish_dev_init(pdev);
 129         if (!dev) {
 130                 ret = -ENOMEM;
 131                 goto release_regions;
 132         }
 133         hw = to_ish_hw(dev);
 134         dev->print_log = ish_event_tracer;
 135
 136         /* mapping IO device memory */
 137         hw->mem_addr = pci_iomap(pdev, 0, 0);
 138         if (!hw->mem_addr) {
 139                 dev_err(&pdev->dev, "ISH: mapping I/O range failure\n");
 140                 ret = -ENOMEM;
 141                 goto free_device;
 142         }
 143
 144         dev->pdev = pdev;
 145
 146         pdev->dev_flags |= PCI_DEV_FLAGS_NO_D3;
 147
 148         /* request and enable interrupt */
 149         ret = request_irq(pdev->irq, ish_irq_handler, IRQF_SHARED,
 150                           KBUILD_MODNAME, dev);
 151         if (ret) {
 152                 dev_err(&pdev->dev, "ISH: request IRQ failure (%d)\n",
 153                         pdev->irq);
 154                 goto free_device;
 155         }
 156
 157         dev_set_drvdata(dev->devc, dev);
 158
 159         init_waitqueue_head(&dev->suspend_wait);
 160         init_waitqueue_head(&dev->resume_wait);
 161
 162         ret = ish_init(dev);
 163         if (ret)
 164                 goto free_irq;
 165
 166         return 0;
 167
 168 free_irq:
 169         free_irq(pdev->irq, dev);
 170 free_device:
 171         pci_iounmap(pdev, hw->mem_addr);
 172         kfree(dev);
 173 release_regions:
 174         pci_release_regions(pdev);
 175 disable_device:
 176         pci_clear_master(pdev);
 177         pci_disable_device(pdev);
 178         dev_err(&pdev->dev, "ISH: PCI driver initialization failed.\n");
 179
 180         return ret;
 181 }
 182
 183 /**
 184  * ish_remove() - PCI driver remove callback
 185  * @pdev:       pci device
 186  *
 187  * This function does cleanup of ISH on pci remove callback
 188  */
 189 static void ish_remove(struct pci_dev *pdev)
 190 {
 191         struct ishtp_device *ishtp_dev = pci_get_drvdata(pdev);
 192         struct ish_hw *hw = to_ish_hw(ishtp_dev);
 193
 194         ishtp_bus_remove_all_clients(ishtp_dev, false);
 195         ish_device_disable(ishtp_dev);
 196
 197         free_irq(pdev->irq, ishtp_dev);
 198         pci_iounmap(pdev, hw->mem_addr);
 199         pci_release_regions(pdev);
 200         pci_clear_master(pdev);
 201         pci_disable_device(pdev);
 202         kfree(ishtp_dev);
 203 }
 204
 205 #ifdef CONFIG_PM
 206 static struct device *ish_resume_device;
 207
 208 /**
 209  * ish_resume_handler() - Work function to complete resume
 210  * @work:       work struct
 211  *
 212  * The resume work function to complete resume function asynchronously.
 213  * There are two types of platforms, one where ISH is not powered off,
 214  * in that case a simple resume message is enough, others we need
 215  * a reset sequence.
 216  */
 217 static void ish_resume_handler(struct work_struct *work)
 218 {
 219         struct pci_dev *pdev = to_pci_dev(ish_resume_device);
 220         struct ishtp_device *dev = pci_get_drvdata(pdev);
 221         int ret;
 222
 223         ishtp_send_resume(dev);
 224
 225         /* 50 ms to get resume response */
 226         if (dev->resume_flag)
 227                 ret = wait_event_interruptible_timeout(dev->resume_wait,
 228                                                        !dev->resume_flag,
 229                                                        msecs_to_jiffies(50));
 230
 231         /*
 232          * If no resume response. This platform  is not S0ix compatible
 233          * So on resume full reboot of ISH processor will happen, so
 234          * need to go through init sequence again
 235          */
 236         if (dev->resume_flag)
 237                 ish_init(dev);
 238 }
 239
 240 /**
 241  * ish_suspend() - ISH suspend callback
 242  * @device:     device pointer
 243  *
 244  * ISH suspend callback
 245  *
 246  * Return: 0 to the pm core
 247  */
 248 static int ish_suspend(struct device *device)
 249 {
 250         struct pci_dev *pdev = to_pci_dev(device);
 251         struct ishtp_device *dev = pci_get_drvdata(pdev);
 252
 253         enable_irq_wake(pdev->irq);
 254         /*
 255          * If previous suspend hasn't been asnwered then ISH is likely dead,
 256          * don't attempt nested notification
 257          */
 258         if (dev->suspend_flag)
 259                 return  0;
 260
 261         dev->resume_flag = 0;
 262         dev->suspend_flag = 1;
 263         ishtp_send_suspend(dev);
 264
 265         /* 25 ms should be enough for live ISH to flush all IPC buf */
 266         if (dev->suspend_flag)
 267                 wait_event_interruptible_timeout(dev->suspend_wait,
 268                                                  !dev->suspend_flag,
 269                                                   msecs_to_jiffies(25));
 270
 271         return 0;
 272 }
 273
 274 static DECLARE_WORK(resume_work, ish_resume_handler);
 275 /**
 276  * ish_resume() - ISH resume callback
 277  * @device:     device pointer
 278  *
 279  * ISH resume callback
 280  *
 281  * Return: 0 to the pm core
 282  */
 283 static int ish_resume(struct device *device)
 284 {
 285         struct pci_dev *pdev = to_pci_dev(device);
 286         struct ishtp_device *dev = pci_get_drvdata(pdev);
 287
 288         ish_resume_device = device;
 289         dev->resume_flag = 1;
 290
 291         disable_irq_wake(pdev->irq);
 292         schedule_work(&resume_work);
 293
 294         return 0;
 295 }
 296
 297 static const struct dev_pm_ops ish_pm_ops = {
 298         .suspend = ish_suspend,
 299         .resume = ish_resume,
 300 };
 301 #define ISHTP_ISH_PM_OPS        (&ish_pm_ops)
 302 #else
 303 #define ISHTP_ISH_PM_OPS        NULL
 304 #endif /* CONFIG_PM */
 305
 306 static struct pci_driver ish_driver = {
 307         .name = KBUILD_MODNAME,
 308         .id_table = ish_pci_tbl,
 309         .probe = ish_probe,
 310         .remove = ish_remove,
 311         .driver.pm = ISHTP_ISH_PM_OPS,
 312 };
 313
 314 module_pci_driver(ish_driver);
 315
 316 /* Original author */
 317 MODULE_AUTHOR("Daniel Drubin <daniel.drubin@intel.com>");
 318 /* Adoption to upstream Linux kernel */
 319 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 320
 321 MODULE_DESCRIPTION("Intel(R) Integrated Sensor Hub PCI Device Driver");
 322 MODULE_LICENSE("GPL");