1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ddbridge.c: Digital Devices PCIe bridge driver
4 *
5 * Copyright (C) 2010-2017 Digital Devices GmbH
6 *                         Ralph Metzler <rjkm@metzlerbros.de>
7 *                         Marcus Metzler <mocm@metzlerbros.de>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * version 2 only, as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 */
18
19#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21#include <linux/module.h>
22#include <linux/init.h>
23#include <linux/interrupt.h>
24#include <linux/delay.h>
25#include <linux/slab.h>
26#include <linux/poll.h>
27#include <linux/io.h>
28#include <linux/pci.h>
29#include <linux/pci_ids.h>
30#include <linux/timer.h>
31#include <linux/i2c.h>
32#include <linux/swab.h>
33#include <linux/vmalloc.h>
34
35#include "ddbridge.h"
36#include "ddbridge-i2c.h"
37#include "ddbridge-regs.h"
38#include "ddbridge-hw.h"
39#include "ddbridge-io.h"
40
41/****************************************************************************/
42/* module parameters */
43
44#ifdef CONFIG_PCI_MSI
45#ifdef CONFIG_DVB_DDBRIDGE_MSIENABLE
46static int msi = 1;
47#else
48static int msi;
49#endif
50module_param(msi, int, 0444);
51#ifdef CONFIG_DVB_DDBRIDGE_MSIENABLE
52MODULE_PARM_DESC(msi, "Control MSI interrupts: 0-disable, 1-enable (default)");
53#else
54MODULE_PARM_DESC(msi, "Control MSI interrupts: 0-disable (default), 1-enable");
55#endif
56#endif
57
58/****************************************************************************/
59/****************************************************************************/
60/****************************************************************************/
61
62static void ddb_irq_disable(struct ddb *dev)
63{
64	ddbwritel(dev, 0, INTERRUPT_ENABLE);
65	ddbwritel(dev, 0, MSI1_ENABLE);
66}
67
68static void ddb_msi_exit(struct ddb *dev)
69{
70#ifdef CONFIG_PCI_MSI
71	if (dev->msi)
72		pci_free_irq_vectors(dev->pdev);
73#endif
74}
75
76static void ddb_irq_exit(struct ddb *dev)
77{
78	ddb_irq_disable(dev);
79	if (dev->msi == 2)
80		free_irq(pci_irq_vector(dev->pdev, 1), dev);
81	free_irq(pci_irq_vector(dev->pdev, 0), dev);
82}
83
84static void ddb_remove(struct pci_dev *pdev)
85{
86	struct ddb *dev = (struct ddb *)pci_get_drvdata(pdev);
87
88	ddb_device_destroy(dev);
89	ddb_ports_detach(dev);
90	ddb_i2c_release(dev);
91
92	ddb_irq_exit(dev);
93	ddb_msi_exit(dev);
94	ddb_ports_release(dev);
95	ddb_buffers_free(dev);
96
97	ddb_unmap(dev);
98	pci_set_drvdata(pdev, NULL);
99	pci_disable_device(pdev);
100}
101
102#ifdef CONFIG_PCI_MSI
103static void ddb_irq_msi(struct ddb *dev, int nr)
104{
105	int stat;
106
107	if (msi && pci_msi_enabled()) {
108		stat = pci_alloc_irq_vectors(dev->pdev, 1, nr,
109					     PCI_IRQ_MSI | PCI_IRQ_MSIX);
110		if (stat >= 1) {
111			dev->msi = stat;
112			dev_info(dev->dev, "using %d MSI interrupt(s)\n",
113				 dev->msi);
114		} else {
115			dev_info(dev->dev, "MSI not available.\n");
116		}
117	}
118}
119#endif
120
121static int ddb_irq_init(struct ddb *dev)
122{
123	int stat;
124	int irq_flag = IRQF_SHARED;
125
126	ddbwritel(dev, 0x00000000, INTERRUPT_ENABLE);
127	ddbwritel(dev, 0x00000000, MSI1_ENABLE);
128	ddbwritel(dev, 0x00000000, MSI2_ENABLE);
129	ddbwritel(dev, 0x00000000, MSI3_ENABLE);
130	ddbwritel(dev, 0x00000000, MSI4_ENABLE);
131	ddbwritel(dev, 0x00000000, MSI5_ENABLE);
132	ddbwritel(dev, 0x00000000, MSI6_ENABLE);
133	ddbwritel(dev, 0x00000000, MSI7_ENABLE);
134
135#ifdef CONFIG_PCI_MSI
136	ddb_irq_msi(dev, 2);
137
138	if (dev->msi)
139		irq_flag = 0;
140	if (dev->msi == 2) {
141		stat = request_irq(pci_irq_vector(dev->pdev, 0),
142				   ddb_irq_handler0, irq_flag, "ddbridge",
143				   (void *)dev);
144		if (stat < 0)
145			return stat;
146		stat = request_irq(pci_irq_vector(dev->pdev, 1),
147				   ddb_irq_handler1, irq_flag, "ddbridge",
148				   (void *)dev);
149		if (stat < 0) {
150			free_irq(pci_irq_vector(dev->pdev, 0), dev);
151			return stat;
152		}
153	} else
154#endif
155	{
156		stat = request_irq(pci_irq_vector(dev->pdev, 0),
157				   ddb_irq_handler, irq_flag, "ddbridge",
158				   (void *)dev);
159		if (stat < 0)
160			return stat;
161	}
162	if (dev->msi == 2) {
163		ddbwritel(dev, 0x0fffff00, INTERRUPT_ENABLE);
164		ddbwritel(dev, 0x0000000f, MSI1_ENABLE);
165	} else {
166		ddbwritel(dev, 0x0fffff0f, INTERRUPT_ENABLE);
167		ddbwritel(dev, 0x00000000, MSI1_ENABLE);
168	}
169	return stat;
170}
171
172static int ddb_probe(struct pci_dev *pdev,
173		     const struct pci_device_id *id)
174{
175	struct ddb *dev;
176	int stat = 0;
177
178	if (pci_enable_device(pdev) < 0)
179		return -ENODEV;
180
181	pci_set_master(pdev);
182
183	if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
184		if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)))
185			return -ENODEV;
186
187	dev = vzalloc(sizeof(*dev));
188	if (!dev)
189		return -ENOMEM;
190
191	mutex_init(&dev->mutex);
192	dev->has_dma = 1;
193	dev->pdev = pdev;
194	dev->dev = &pdev->dev;
195	pci_set_drvdata(pdev, dev);
196
197	dev->link[0].ids.vendor = id->vendor;
198	dev->link[0].ids.device = id->device;
199	dev->link[0].ids.subvendor = id->subvendor;
200	dev->link[0].ids.subdevice = pdev->subsystem_device;
201	dev->link[0].ids.devid = (id->device << 16) | id->vendor;
202
203	dev->link[0].dev = dev;
204	dev->link[0].info = get_ddb_info(id->vendor, id->device,
205					 id->subvendor, pdev->subsystem_device);
206
207	dev_info(&pdev->dev, "detected %s\n", dev->link[0].info->name);
208
209	dev->regs_len = pci_resource_len(dev->pdev, 0);
210	dev->regs = ioremap(pci_resource_start(dev->pdev, 0),
211			    pci_resource_len(dev->pdev, 0));
212
213	if (!dev->regs) {
214		dev_err(&pdev->dev, "not enough memory for register map\n");
215		stat = -ENOMEM;
216		goto fail;
217	}
218	if (ddbreadl(dev, 0) == 0xffffffff) {
219		dev_err(&pdev->dev, "cannot read registers\n");
220		stat = -ENODEV;
221		goto fail;
222	}
223
224	dev->link[0].ids.hwid = ddbreadl(dev, 0);
225	dev->link[0].ids.regmapid = ddbreadl(dev, 4);
226
227	dev_info(&pdev->dev, "HW %08x REGMAP %08x\n",
228		 dev->link[0].ids.hwid, dev->link[0].ids.regmapid);
229
230	ddbwritel(dev, 0, DMA_BASE_READ);
231	ddbwritel(dev, 0, DMA_BASE_WRITE);
232
233	stat = ddb_irq_init(dev);
234	if (stat < 0)
235		goto fail0;
236
237	if (ddb_init(dev) == 0)
238		return 0;
239
240	ddb_irq_exit(dev);
241fail0:
242	dev_err(&pdev->dev, "fail0\n");
243	ddb_msi_exit(dev);
244fail:
245	dev_err(&pdev->dev, "fail\n");
246
247	ddb_unmap(dev);
248	pci_set_drvdata(pdev, NULL);
249	pci_disable_device(pdev);
250	return stat;
251}
252
253/****************************************************************************/
254/****************************************************************************/
255/****************************************************************************/
256
257#define DDB_DEVICE_ANY(_device) \
258		{ PCI_DEVICE_SUB(DDVID, _device, DDVID, PCI_ANY_ID) }
259
260static const struct pci_device_id ddb_id_table[] = {
261	DDB_DEVICE_ANY(0x0002),
262	DDB_DEVICE_ANY(0x0003),
263	DDB_DEVICE_ANY(0x0005),
264	DDB_DEVICE_ANY(0x0006),
265	DDB_DEVICE_ANY(0x0007),
266	DDB_DEVICE_ANY(0x0008),
267	DDB_DEVICE_ANY(0x0009),
268	DDB_DEVICE_ANY(0x0011),
269	DDB_DEVICE_ANY(0x0012),
270	DDB_DEVICE_ANY(0x0013),
271	DDB_DEVICE_ANY(0x0201),
272	DDB_DEVICE_ANY(0x0203),
273	DDB_DEVICE_ANY(0x0210),
274	DDB_DEVICE_ANY(0x0220),
275	DDB_DEVICE_ANY(0x0320),
276	DDB_DEVICE_ANY(0x0321),
277	DDB_DEVICE_ANY(0x0322),
278	DDB_DEVICE_ANY(0x0323),
279	DDB_DEVICE_ANY(0x0328),
280	DDB_DEVICE_ANY(0x0329),
281	{0}
282};
283
284MODULE_DEVICE_TABLE(pci, ddb_id_table);
285
286static struct pci_driver ddb_pci_driver = {
287	.name        = "ddbridge",
288	.id_table    = ddb_id_table,
289	.probe       = ddb_probe,
290	.remove      = ddb_remove,
291};
292
293static __init int module_init_ddbridge(void)
294{
295	int stat;
296
297	pr_info("Digital Devices PCIE bridge driver "
298		DDBRIDGE_VERSION
299		", Copyright (C) 2010-17 Digital Devices GmbH\n");
300	stat = ddb_init_ddbridge();
301	if (stat < 0)
302		return stat;
303	stat = pci_register_driver(&ddb_pci_driver);
304	if (stat < 0)
305		ddb_exit_ddbridge(0, stat);
306
307	return stat;
308}
309
310static __exit void module_exit_ddbridge(void)
311{
312	pci_unregister_driver(&ddb_pci_driver);
313	ddb_exit_ddbridge(0, 0);
314}
315
316module_init(module_init_ddbridge);
317module_exit(module_exit_ddbridge);
318
319MODULE_DESCRIPTION("Digital Devices PCIe Bridge");
320MODULE_AUTHOR("Ralph and Marcus Metzler, Metzler Brothers Systementwicklung GbR");
321MODULE_LICENSE("GPL v2");
322MODULE_VERSION(DDBRIDGE_VERSION);
323