1/*
  2 *
  3 * Intel Management Engine Interface (Intel MEI) Linux driver
  4 * Copyright (c) 2013-2014, 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
 17#include <linux/module.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/init.h>
 25#include <linux/sched.h>
 26#include <linux/uuid.h>
 27#include <linux/jiffies.h>
 28#include <linux/interrupt.h>
 29#include <linux/workqueue.h>
 30
 31#include <linux/mei.h>
 32
 33
 34#include "mei_dev.h"
 35#include "hw-txe.h"
 36
 37static const struct pci_device_id mei_txe_pci_tbl[] = {
 38	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0F18)}, /* Baytrail */
 39	{0, }
 40};
 41MODULE_DEVICE_TABLE(pci, mei_txe_pci_tbl);
 42
 43
 44static void mei_txe_pci_iounmap(struct pci_dev *pdev, struct mei_txe_hw *hw)
 45{
 46	int i;
 47	for (i = SEC_BAR; i < NUM_OF_MEM_BARS; i++) {
 48		if (hw->mem_addr[i]) {
 49			pci_iounmap(pdev, hw->mem_addr[i]);
 50			hw->mem_addr[i] = NULL;
 51		}
 52	}
 53}
 54/**
 55 * mei_probe - Device Initialization Routine
 56 *
 57 * @pdev: PCI device structure
 58 * @ent: entry in mei_txe_pci_tbl
 59 *
 60 * returns 0 on success, <0 on failure.
 61 */
 62static int mei_txe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 63{
 64	struct mei_device *dev;
 65	struct mei_txe_hw *hw;
 66	int err;
 67	int i;
 68
 69	/* enable pci dev */
 70	err = pci_enable_device(pdev);
 71	if (err) {
 72		dev_err(&pdev->dev, "failed to enable pci device.\n");
 73		goto end;
 74	}
 75	/* set PCI host mastering  */
 76	pci_set_master(pdev);
 77	/* pci request regions for mei driver */
 78	err = pci_request_regions(pdev, KBUILD_MODNAME);
 79	if (err) {
 80		dev_err(&pdev->dev, "failed to get pci regions.\n");
 81		goto disable_device;
 82	}
 83
 84	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(36));
 85	if (err) {
 86		err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 87		if (err) {
 88			dev_err(&pdev->dev, "No suitable DMA available.\n");
 89			goto release_regions;
 90		}
 91	}
 92
 93	/* allocates and initializes the mei dev structure */
 94	dev = mei_txe_dev_init(pdev);
 95	if (!dev) {
 96		err = -ENOMEM;
 97		goto release_regions;
 98	}
 99	hw = to_txe_hw(dev);
100
101	/* mapping  IO device memory */
102	for (i = SEC_BAR; i < NUM_OF_MEM_BARS; i++) {
103		hw->mem_addr[i] = pci_iomap(pdev, i, 0);
104		if (!hw->mem_addr[i]) {
105			dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
106			err = -ENOMEM;
107			goto free_device;
108		}
109	}
110
111
112	pci_enable_msi(pdev);
113
114	/* clear spurious interrupts */
115	mei_clear_interrupts(dev);
116
117	/* request and enable interrupt  */
118	if (pci_dev_msi_enabled(pdev))
119		err = request_threaded_irq(pdev->irq,
120			NULL,
121			mei_txe_irq_thread_handler,
122			IRQF_ONESHOT, KBUILD_MODNAME, dev);
123	else
124		err = request_threaded_irq(pdev->irq,
125			mei_txe_irq_quick_handler,
126			mei_txe_irq_thread_handler,
127			IRQF_SHARED, KBUILD_MODNAME, dev);
128	if (err) {
129		dev_err(&pdev->dev, "mei: request_threaded_irq failure. irq = %d\n",
130			pdev->irq);
131		goto free_device;
132	}
133
134	if (mei_start(dev)) {
135		dev_err(&pdev->dev, "init hw failure.\n");
136		err = -ENODEV;
137		goto release_irq;
138	}
139
140	err = mei_register(dev);
141	if (err)
142		goto release_irq;
143
144	pci_set_drvdata(pdev, dev);
145
146	return 0;
147
148release_irq:
149
150	mei_cancel_work(dev);
151
152	/* disable interrupts */
153	mei_disable_interrupts(dev);
154
155	free_irq(pdev->irq, dev);
156	pci_disable_msi(pdev);
157
158free_device:
159	mei_txe_pci_iounmap(pdev, hw);
160
161	kfree(dev);
162release_regions:
163	pci_release_regions(pdev);
164disable_device:
165	pci_disable_device(pdev);
166end:
167	dev_err(&pdev->dev, "initialization failed.\n");
168	return err;
169}
170
171/**
172 * mei_remove - Device Removal Routine
173 *
174 * @pdev: PCI device structure
175 *
176 * mei_remove is called by the PCI subsystem to alert the driver
177 * that it should release a PCI device.
178 */
179static void mei_txe_remove(struct pci_dev *pdev)
180{
181	struct mei_device *dev;
182	struct mei_txe_hw *hw;
183
184	dev = pci_get_drvdata(pdev);
185	if (!dev) {
186		dev_err(&pdev->dev, "mei: dev =NULL\n");
187		return;
188	}
189
190	hw = to_txe_hw(dev);
191
192	mei_stop(dev);
193
194	/* disable interrupts */
195	mei_disable_interrupts(dev);
196	free_irq(pdev->irq, dev);
197	pci_disable_msi(pdev);
198
199	pci_set_drvdata(pdev, NULL);
200
201	mei_txe_pci_iounmap(pdev, hw);
202
203	mei_deregister(dev);
204
205	kfree(dev);
206
207	pci_release_regions(pdev);
208	pci_disable_device(pdev);
209}
210
211
212#ifdef CONFIG_PM_SLEEP
213static int mei_txe_pci_suspend(struct device *device)
214{
215	struct pci_dev *pdev = to_pci_dev(device);
216	struct mei_device *dev = pci_get_drvdata(pdev);
217
218	if (!dev)
219		return -ENODEV;
220
221	dev_dbg(&pdev->dev, "suspend\n");
222
223	mei_stop(dev);
224
225	mei_disable_interrupts(dev);
226
227	free_irq(pdev->irq, dev);
228	pci_disable_msi(pdev);
229
230	return 0;
231}
232
233static int mei_txe_pci_resume(struct device *device)
234{
235	struct pci_dev *pdev = to_pci_dev(device);
236	struct mei_device *dev;
237	int err;
238
239	dev = pci_get_drvdata(pdev);
240	if (!dev)
241		return -ENODEV;
242
243	pci_enable_msi(pdev);
244
245	mei_clear_interrupts(dev);
246
247	/* request and enable interrupt */
248	if (pci_dev_msi_enabled(pdev))
249		err = request_threaded_irq(pdev->irq,
250			NULL,
251			mei_txe_irq_thread_handler,
252			IRQF_ONESHOT, KBUILD_MODNAME, dev);
253	else
254		err = request_threaded_irq(pdev->irq,
255			mei_txe_irq_quick_handler,
256			mei_txe_irq_thread_handler,
257			IRQF_SHARED, KBUILD_MODNAME, dev);
258	if (err) {
259		dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
260				pdev->irq);
261		return err;
262	}
263
264	err = mei_restart(dev);
265
266	return err;
267}
268
269static SIMPLE_DEV_PM_OPS(mei_txe_pm_ops,
270			 mei_txe_pci_suspend,
271			 mei_txe_pci_resume);
272
273#define MEI_TXE_PM_OPS	(&mei_txe_pm_ops)
274#else
275#define MEI_TXE_PM_OPS	NULL
276#endif /* CONFIG_PM_SLEEP */
277/*
278 *  PCI driver structure
279 */
280static struct pci_driver mei_txe_driver = {
281	.name = KBUILD_MODNAME,
282	.id_table = mei_txe_pci_tbl,
283	.probe = mei_txe_probe,
284	.remove = mei_txe_remove,
285	.shutdown = mei_txe_remove,
286	.driver.pm = MEI_TXE_PM_OPS,
287};
288
289module_pci_driver(mei_txe_driver);
290
291MODULE_AUTHOR("Intel Corporation");
292MODULE_DESCRIPTION("Intel(R) Trusted Execution Environment Interface");
293MODULE_LICENSE("GPL v2");