3 * Intel Management Engine Interface (Intel MEI) Linux driver
4 * Copyright (c) 2003-2012, 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
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19 #include <linux/module.h>
20 #include <linux/moduleparam.h>
21 #include <linux/kernel.h>
22 #include <linux/device.h>
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/fcntl.h>
27 #include <linux/aio.h>
28 #include <linux/pci.h>
29 #include <linux/poll.h>
30 #include <linux/init.h>
31 #include <linux/ioctl.h>
32 #include <linux/cdev.h>
33 #include <linux/sched.h>
34 #include <linux/uuid.h>
35 #include <linux/compat.h>
36 #include <linux/jiffies.h>
37 #include <linux/interrupt.h>
38 #include <linux/miscdevice.h>
40 #include <linux/mei.h>
46 /* AMT device is a singleton on the platform */
47 static struct pci_dev *mei_pdev;
49 /* mei_pci_tbl - PCI Device ID Table */
50 static DEFINE_PCI_DEVICE_TABLE(mei_me_pci_tbl) = {
51 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82946GZ)},
52 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G35)},
53 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82Q965)},
54 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G965)},
55 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GM965)},
56 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GME965)},
57 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q35)},
58 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82G33)},
59 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q33)},
60 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82X38)},
61 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_3200)},
62 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_6)},
63 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_7)},
64 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_8)},
65 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_9)},
66 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_10)},
67 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_1)},
68 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_2)},
69 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_3)},
70 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_4)},
71 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_1)},
72 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_2)},
73 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_3)},
74 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_4)},
75 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_1)},
76 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_2)},
77 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_CPT_1)},
78 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PBG_1)},
79 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_1)},
80 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_2)},
81 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_3)},
82 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT_H)},
83 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT_W)},
84 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT_LP)},
85 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT_HR)},
86 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_WPT_LP)},
88 /* required last entry */
92 MODULE_DEVICE_TABLE(pci, mei_me_pci_tbl);
94 static DEFINE_MUTEX(mei_mutex);
97 * mei_quirk_probe - probe for devices that doesn't valid ME interface
99 * @pdev: PCI device structure
100 * @ent: entry into pci_device_table
102 * returns true if ME Interface is valid, false otherwise
104 static bool mei_me_quirk_probe(struct pci_dev *pdev,
105 const struct pci_device_id *ent)
108 if (ent->device == MEI_DEV_ID_PBG_1) {
109 pci_read_config_dword(pdev, 0x48, ®);
110 /* make sure that bit 9 is up and bit 10 is down */
111 if ((reg & 0x600) == 0x200) {
112 dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
119 * mei_probe - Device Initialization Routine
121 * @pdev: PCI device structure
122 * @ent: entry in kcs_pci_tbl
124 * returns 0 on success, <0 on failure.
126 static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
128 struct mei_device *dev;
129 struct mei_me_hw *hw;
132 mutex_lock(&mei_mutex);
134 if (!mei_me_quirk_probe(pdev, ent)) {
144 err = pci_enable_device(pdev);
146 dev_err(&pdev->dev, "failed to enable pci device.\n");
149 /* set PCI host mastering */
150 pci_set_master(pdev);
151 /* pci request regions for mei driver */
152 err = pci_request_regions(pdev, KBUILD_MODNAME);
154 dev_err(&pdev->dev, "failed to get pci regions.\n");
157 /* allocates and initializes the mei dev structure */
158 dev = mei_me_dev_init(pdev);
161 goto release_regions;
164 /* mapping IO device memory */
165 hw->mem_addr = pci_iomap(pdev, 0, 0);
167 dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
171 pci_enable_msi(pdev);
173 /* request and enable interrupt */
174 if (pci_dev_msi_enabled(pdev))
175 err = request_threaded_irq(pdev->irq,
177 mei_me_irq_thread_handler,
178 IRQF_ONESHOT, KBUILD_MODNAME, dev);
180 err = request_threaded_irq(pdev->irq,
181 mei_me_irq_quick_handler,
182 mei_me_irq_thread_handler,
183 IRQF_SHARED, KBUILD_MODNAME, dev);
186 dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
191 if (mei_start(dev)) {
192 dev_err(&pdev->dev, "init hw failure.\n");
197 err = mei_register(dev);
202 pci_set_drvdata(pdev, dev);
204 schedule_delayed_work(&dev->timer_work, HZ);
206 mutex_unlock(&mei_mutex);
208 pr_debug("initialization successful.\n");
213 mei_disable_interrupts(dev);
214 flush_scheduled_work();
215 free_irq(pdev->irq, dev);
217 pci_disable_msi(pdev);
218 pci_iounmap(pdev, hw->mem_addr);
222 pci_release_regions(pdev);
224 pci_disable_device(pdev);
226 mutex_unlock(&mei_mutex);
227 dev_err(&pdev->dev, "initialization failed.\n");
232 * mei_remove - Device Removal Routine
234 * @pdev: PCI device structure
236 * mei_remove is called by the PCI subsystem to alert the driver
237 * that it should release a PCI device.
239 static void mei_me_remove(struct pci_dev *pdev)
241 struct mei_device *dev;
242 struct mei_me_hw *hw;
244 if (mei_pdev != pdev)
247 dev = pci_get_drvdata(pdev);
254 dev_err(&pdev->dev, "stop\n");
259 /* disable interrupts */
260 mei_disable_interrupts(dev);
262 free_irq(pdev->irq, dev);
263 pci_disable_msi(pdev);
264 pci_set_drvdata(pdev, NULL);
267 pci_iounmap(pdev, hw->mem_addr);
273 pci_release_regions(pdev);
274 pci_disable_device(pdev);
279 static int mei_me_pci_suspend(struct device *device)
281 struct pci_dev *pdev = to_pci_dev(device);
282 struct mei_device *dev = pci_get_drvdata(pdev);
287 dev_err(&pdev->dev, "suspend\n");
291 mei_disable_interrupts(dev);
293 free_irq(pdev->irq, dev);
294 pci_disable_msi(pdev);
299 static int mei_me_pci_resume(struct device *device)
301 struct pci_dev *pdev = to_pci_dev(device);
302 struct mei_device *dev;
305 dev = pci_get_drvdata(pdev);
309 pci_enable_msi(pdev);
311 /* request and enable interrupt */
312 if (pci_dev_msi_enabled(pdev))
313 err = request_threaded_irq(pdev->irq,
315 mei_me_irq_thread_handler,
316 IRQF_ONESHOT, KBUILD_MODNAME, dev);
318 err = request_threaded_irq(pdev->irq,
319 mei_me_irq_quick_handler,
320 mei_me_irq_thread_handler,
321 IRQF_SHARED, KBUILD_MODNAME, dev);
324 dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
329 mutex_lock(&dev->device_lock);
330 dev->dev_state = MEI_DEV_POWER_UP;
331 mei_clear_interrupts(dev);
333 mutex_unlock(&dev->device_lock);
335 /* Start timer if stopped in suspend */
336 schedule_delayed_work(&dev->timer_work, HZ);
340 static SIMPLE_DEV_PM_OPS(mei_me_pm_ops, mei_me_pci_suspend, mei_me_pci_resume);
341 #define MEI_ME_PM_OPS (&mei_me_pm_ops)
343 #define MEI_ME_PM_OPS NULL
344 #endif /* CONFIG_PM */
346 * PCI driver structure
348 static struct pci_driver mei_me_driver = {
349 .name = KBUILD_MODNAME,
350 .id_table = mei_me_pci_tbl,
351 .probe = mei_me_probe,
352 .remove = mei_me_remove,
353 .shutdown = mei_me_remove,
354 .driver.pm = MEI_ME_PM_OPS,
357 module_pci_driver(mei_me_driver);
359 MODULE_AUTHOR("Intel Corporation");
360 MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
361 MODULE_LICENSE("GPL v2");