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 
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/interrupt.h>
15 #include <linux/delay.h>
16 #include <linux/slab.h>
17 #include <linux/poll.h>
18 #include <linux/io.h>
19 #include <linux/pci.h>
20 #include <linux/pci_ids.h>
21 #include <linux/timer.h>
22 #include <linux/i2c.h>
23 #include <linux/swab.h>
24 #include <linux/vmalloc.h>
25 
26 #include "ddbridge.h"
27 #include "ddbridge-i2c.h"
28 #include "ddbridge-regs.h"
29 #include "ddbridge-hw.h"
30 #include "ddbridge-io.h"
31 
32 /****************************************************************************/
33 /* module parameters */
34 
35 #ifdef CONFIG_PCI_MSI
36 #ifdef CONFIG_DVB_DDBRIDGE_MSIENABLE
37 static int msi = 1;
38 #else
39 static int msi;
40 #endif
41 module_param(msi, int, 0444);
42 #ifdef CONFIG_DVB_DDBRIDGE_MSIENABLE
43 MODULE_PARM_DESC(msi, "Control MSI interrupts: 0-disable, 1-enable (default)");
44 #else
45 MODULE_PARM_DESC(msi, "Control MSI interrupts: 0-disable (default), 1-enable");
46 #endif
47 #endif
48 
49 /****************************************************************************/
50 /****************************************************************************/
51 /****************************************************************************/
52 
53 static void ddb_irq_disable(struct ddb *dev)
54 {
55 	ddbwritel(dev, 0, INTERRUPT_ENABLE);
56 	ddbwritel(dev, 0, MSI1_ENABLE);
57 }
58 
59 static void ddb_msi_exit(struct ddb *dev)
60 {
61 #ifdef CONFIG_PCI_MSI
62 	if (dev->msi)
63 		pci_free_irq_vectors(dev->pdev);
64 #endif
65 }
66 
67 static void ddb_irq_exit(struct ddb *dev)
68 {
69 	ddb_irq_disable(dev);
70 	if (dev->msi == 2)
71 		free_irq(pci_irq_vector(dev->pdev, 1), dev);
72 	free_irq(pci_irq_vector(dev->pdev, 0), dev);
73 }
74 
75 static void ddb_remove(struct pci_dev *pdev)
76 {
77 	struct ddb *dev = (struct ddb *)pci_get_drvdata(pdev);
78 
79 	ddb_device_destroy(dev);
80 	ddb_ports_detach(dev);
81 	ddb_i2c_release(dev);
82 
83 	ddb_irq_exit(dev);
84 	ddb_msi_exit(dev);
85 	ddb_ports_release(dev);
86 	ddb_buffers_free(dev);
87 
88 	ddb_unmap(dev);
89 	pci_set_drvdata(pdev, NULL);
90 	pci_disable_device(pdev);
91 }
92 
93 #ifdef CONFIG_PCI_MSI
94 static void ddb_irq_msi(struct ddb *dev, int nr)
95 {
96 	int stat;
97 
98 	if (msi && pci_msi_enabled()) {
99 		stat = pci_alloc_irq_vectors(dev->pdev, 1, nr,
100 					     PCI_IRQ_MSI | PCI_IRQ_MSIX);
101 		if (stat >= 1) {
102 			dev->msi = stat;
103 			dev_info(dev->dev, "using %d MSI interrupt(s)\n",
104 				 dev->msi);
105 		} else {
106 			dev_info(dev->dev, "MSI not available.\n");
107 		}
108 	}
109 }
110 #endif
111 
112 static int ddb_irq_init(struct ddb *dev)
113 {
114 	int stat;
115 	int irq_flag = IRQF_SHARED;
116 
117 	ddbwritel(dev, 0x00000000, INTERRUPT_ENABLE);
118 	ddbwritel(dev, 0x00000000, MSI1_ENABLE);
119 	ddbwritel(dev, 0x00000000, MSI2_ENABLE);
120 	ddbwritel(dev, 0x00000000, MSI3_ENABLE);
121 	ddbwritel(dev, 0x00000000, MSI4_ENABLE);
122 	ddbwritel(dev, 0x00000000, MSI5_ENABLE);
123 	ddbwritel(dev, 0x00000000, MSI6_ENABLE);
124 	ddbwritel(dev, 0x00000000, MSI7_ENABLE);
125 
126 #ifdef CONFIG_PCI_MSI
127 	ddb_irq_msi(dev, 2);
128 
129 	if (dev->msi)
130 		irq_flag = 0;
131 	if (dev->msi == 2) {
132 		stat = request_irq(pci_irq_vector(dev->pdev, 0),
133 				   ddb_irq_handler0, irq_flag, "ddbridge",
134 				   (void *)dev);
135 		if (stat < 0)
136 			return stat;
137 		stat = request_irq(pci_irq_vector(dev->pdev, 1),
138 				   ddb_irq_handler1, irq_flag, "ddbridge",
139 				   (void *)dev);
140 		if (stat < 0) {
141 			free_irq(pci_irq_vector(dev->pdev, 0), dev);
142 			return stat;
143 		}
144 	} else
145 #endif
146 	{
147 		stat = request_irq(pci_irq_vector(dev->pdev, 0),
148 				   ddb_irq_handler, irq_flag, "ddbridge",
149 				   (void *)dev);
150 		if (stat < 0)
151 			return stat;
152 	}
153 	if (dev->msi == 2) {
154 		ddbwritel(dev, 0x0fffff00, INTERRUPT_ENABLE);
155 		ddbwritel(dev, 0x0000000f, MSI1_ENABLE);
156 	} else {
157 		ddbwritel(dev, 0x0fffff0f, INTERRUPT_ENABLE);
158 		ddbwritel(dev, 0x00000000, MSI1_ENABLE);
159 	}
160 	return stat;
161 }
162 
163 static int ddb_probe(struct pci_dev *pdev,
164 		     const struct pci_device_id *id)
165 {
166 	struct ddb *dev;
167 	int stat = 0;
168 
169 	if (pci_enable_device(pdev) < 0)
170 		return -ENODEV;
171 
172 	pci_set_master(pdev);
173 
174 	if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)))
175 		if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)))
176 			return -ENODEV;
177 
178 	dev = vzalloc(sizeof(*dev));
179 	if (!dev)
180 		return -ENOMEM;
181 
182 	mutex_init(&dev->mutex);
183 	dev->has_dma = 1;
184 	dev->pdev = pdev;
185 	dev->dev = &pdev->dev;
186 	pci_set_drvdata(pdev, dev);
187 
188 	dev->link[0].ids.vendor = id->vendor;
189 	dev->link[0].ids.device = id->device;
190 	dev->link[0].ids.subvendor = id->subvendor;
191 	dev->link[0].ids.subdevice = pdev->subsystem_device;
192 	dev->link[0].ids.devid = (id->device << 16) | id->vendor;
193 
194 	dev->link[0].dev = dev;
195 	dev->link[0].info = get_ddb_info(id->vendor, id->device,
196 					 id->subvendor, pdev->subsystem_device);
197 
198 	dev_info(&pdev->dev, "detected %s\n", dev->link[0].info->name);
199 
200 	dev->regs_len = pci_resource_len(dev->pdev, 0);
201 	dev->regs = ioremap(pci_resource_start(dev->pdev, 0),
202 			    pci_resource_len(dev->pdev, 0));
203 
204 	if (!dev->regs) {
205 		dev_err(&pdev->dev, "not enough memory for register map\n");
206 		stat = -ENOMEM;
207 		goto fail;
208 	}
209 	if (ddbreadl(dev, 0) == 0xffffffff) {
210 		dev_err(&pdev->dev, "cannot read registers\n");
211 		stat = -ENODEV;
212 		goto fail;
213 	}
214 
215 	dev->link[0].ids.hwid = ddbreadl(dev, 0);
216 	dev->link[0].ids.regmapid = ddbreadl(dev, 4);
217 
218 	dev_info(&pdev->dev, "HW %08x REGMAP %08x\n",
219 		 dev->link[0].ids.hwid, dev->link[0].ids.regmapid);
220 
221 	ddbwritel(dev, 0, DMA_BASE_READ);
222 	ddbwritel(dev, 0, DMA_BASE_WRITE);
223 
224 	stat = ddb_irq_init(dev);
225 	if (stat < 0)
226 		goto fail0;
227 
228 	if (ddb_init(dev) == 0)
229 		return 0;
230 
231 	ddb_irq_exit(dev);
232 fail0:
233 	dev_err(&pdev->dev, "fail0\n");
234 	ddb_msi_exit(dev);
235 fail:
236 	dev_err(&pdev->dev, "fail\n");
237 
238 	ddb_unmap(dev);
239 	pci_set_drvdata(pdev, NULL);
240 	pci_disable_device(pdev);
241 	return -1;
242 }
243 
244 /****************************************************************************/
245 /****************************************************************************/
246 /****************************************************************************/
247 
248 #define DDB_DEVICE_ANY(_device) \
249 		{ PCI_DEVICE_SUB(DDVID, _device, DDVID, PCI_ANY_ID) }
250 
251 static const struct pci_device_id ddb_id_table[] = {
252 	DDB_DEVICE_ANY(0x0002),
253 	DDB_DEVICE_ANY(0x0003),
254 	DDB_DEVICE_ANY(0x0005),
255 	DDB_DEVICE_ANY(0x0006),
256 	DDB_DEVICE_ANY(0x0007),
257 	DDB_DEVICE_ANY(0x0008),
258 	DDB_DEVICE_ANY(0x0009),
259 	DDB_DEVICE_ANY(0x0011),
260 	DDB_DEVICE_ANY(0x0012),
261 	DDB_DEVICE_ANY(0x0013),
262 	DDB_DEVICE_ANY(0x0201),
263 	DDB_DEVICE_ANY(0x0203),
264 	DDB_DEVICE_ANY(0x0210),
265 	DDB_DEVICE_ANY(0x0220),
266 	DDB_DEVICE_ANY(0x0320),
267 	DDB_DEVICE_ANY(0x0321),
268 	DDB_DEVICE_ANY(0x0322),
269 	DDB_DEVICE_ANY(0x0323),
270 	DDB_DEVICE_ANY(0x0328),
271 	DDB_DEVICE_ANY(0x0329),
272 	{0}
273 };
274 
275 MODULE_DEVICE_TABLE(pci, ddb_id_table);
276 
277 static struct pci_driver ddb_pci_driver = {
278 	.name        = "ddbridge",
279 	.id_table    = ddb_id_table,
280 	.probe       = ddb_probe,
281 	.remove      = ddb_remove,
282 };
283 
284 static __init int module_init_ddbridge(void)
285 {
286 	int stat;
287 
288 	pr_info("Digital Devices PCIE bridge driver "
289 		DDBRIDGE_VERSION
290 		", Copyright (C) 2010-17 Digital Devices GmbH\n");
291 	stat = ddb_init_ddbridge();
292 	if (stat < 0)
293 		return stat;
294 	stat = pci_register_driver(&ddb_pci_driver);
295 	if (stat < 0)
296 		ddb_exit_ddbridge(0, stat);
297 
298 	return stat;
299 }
300 
301 static __exit void module_exit_ddbridge(void)
302 {
303 	pci_unregister_driver(&ddb_pci_driver);
304 	ddb_exit_ddbridge(0, 0);
305 }
306 
307 module_init(module_init_ddbridge);
308 module_exit(module_exit_ddbridge);
309 
310 MODULE_DESCRIPTION("Digital Devices PCIe Bridge");
311 MODULE_AUTHOR("Ralph and Marcus Metzler, Metzler Brothers Systementwicklung GbR");
312 MODULE_LICENSE("GPL v2");
313 MODULE_VERSION(DDBRIDGE_VERSION);
314