1 /*
2  * AMD 10Gb Ethernet driver
3  *
4  * This file is available to you under your choice of the following two
5  * licenses:
6  *
7  * License 1: GPLv2
8  *
9  * Copyright (c) 2014 Advanced Micro Devices, Inc.
10  *
11  * This file is free software; you may copy, redistribute and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation, either version 2 of the License, or (at
14  * your option) any later version.
15  *
16  * This file is distributed in the hope that it will be useful, but
17  * WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19  * General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
23  *
24  * This file incorporates work covered by the following copyright and
25  * permission notice:
26  *     The Synopsys DWC ETHER XGMAC Software Driver and documentation
27  *     (hereinafter "Software") is an unsupported proprietary work of Synopsys,
28  *     Inc. unless otherwise expressly agreed to in writing between Synopsys
29  *     and you.
30  *
31  *     The Software IS NOT an item of Licensed Software or Licensed Product
32  *     under any End User Software License Agreement or Agreement for Licensed
33  *     Product with Synopsys or any supplement thereto.  Permission is hereby
34  *     granted, free of charge, to any person obtaining a copy of this software
35  *     annotated with this license and the Software, to deal in the Software
36  *     without restriction, including without limitation the rights to use,
37  *     copy, modify, merge, publish, distribute, sublicense, and/or sell copies
38  *     of the Software, and to permit persons to whom the Software is furnished
39  *     to do so, subject to the following conditions:
40  *
41  *     The above copyright notice and this permission notice shall be included
42  *     in all copies or substantial portions of the Software.
43  *
44  *     THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
45  *     BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
46  *     TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
47  *     PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
48  *     BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
49  *     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
50  *     SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
51  *     INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
52  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
53  *     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
54  *     THE POSSIBILITY OF SUCH DAMAGE.
55  *
56  *
57  * License 2: Modified BSD
58  *
59  * Copyright (c) 2014 Advanced Micro Devices, Inc.
60  * All rights reserved.
61  *
62  * Redistribution and use in source and binary forms, with or without
63  * modification, are permitted provided that the following conditions are met:
64  *     * Redistributions of source code must retain the above copyright
65  *       notice, this list of conditions and the following disclaimer.
66  *     * Redistributions in binary form must reproduce the above copyright
67  *       notice, this list of conditions and the following disclaimer in the
68  *       documentation and/or other materials provided with the distribution.
69  *     * Neither the name of Advanced Micro Devices, Inc. nor the
70  *       names of its contributors may be used to endorse or promote products
71  *       derived from this software without specific prior written permission.
72  *
73  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
74  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
75  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
76  * ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
77  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
78  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
79  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
80  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
81  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
82  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
83  *
84  * This file incorporates work covered by the following copyright and
85  * permission notice:
86  *     The Synopsys DWC ETHER XGMAC Software Driver and documentation
87  *     (hereinafter "Software") is an unsupported proprietary work of Synopsys,
88  *     Inc. unless otherwise expressly agreed to in writing between Synopsys
89  *     and you.
90  *
91  *     The Software IS NOT an item of Licensed Software or Licensed Product
92  *     under any End User Software License Agreement or Agreement for Licensed
93  *     Product with Synopsys or any supplement thereto.  Permission is hereby
94  *     granted, free of charge, to any person obtaining a copy of this software
95  *     annotated with this license and the Software, to deal in the Software
96  *     without restriction, including without limitation the rights to use,
97  *     copy, modify, merge, publish, distribute, sublicense, and/or sell copies
98  *     of the Software, and to permit persons to whom the Software is furnished
99  *     to do so, subject to the following conditions:
100  *
101  *     The above copyright notice and this permission notice shall be included
102  *     in all copies or substantial portions of the Software.
103  *
104  *     THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
105  *     BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
106  *     TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
107  *     PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
108  *     BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
109  *     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
110  *     SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
111  *     INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
112  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
113  *     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
114  *     THE POSSIBILITY OF SUCH DAMAGE.
115  */
116 
117 #include <linux/debugfs.h>
118 #include <linux/module.h>
119 #include <linux/slab.h>
120 
121 #include "xgbe.h"
122 #include "xgbe-common.h"
123 
124 static ssize_t xgbe_common_read(char __user *buffer, size_t count,
125 				loff_t *ppos, unsigned int value)
126 {
127 	char *buf;
128 	ssize_t len;
129 
130 	if (*ppos != 0)
131 		return 0;
132 
133 	buf = kasprintf(GFP_KERNEL, "0x%08x\n", value);
134 	if (!buf)
135 		return -ENOMEM;
136 
137 	if (count < strlen(buf)) {
138 		kfree(buf);
139 		return -ENOSPC;
140 	}
141 
142 	len = simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
143 	kfree(buf);
144 
145 	return len;
146 }
147 
148 static ssize_t xgbe_common_write(const char __user *buffer, size_t count,
149 				 loff_t *ppos, unsigned int *value)
150 {
151 	char workarea[32];
152 	ssize_t len;
153 	int ret;
154 
155 	if (*ppos != 0)
156 		return 0;
157 
158 	if (count >= sizeof(workarea))
159 		return -ENOSPC;
160 
161 	len = simple_write_to_buffer(workarea, sizeof(workarea) - 1, ppos,
162 				     buffer, count);
163 	if (len < 0)
164 		return len;
165 
166 	workarea[len] = '\0';
167 	ret = kstrtouint(workarea, 16, value);
168 	if (ret)
169 		return -EIO;
170 
171 	return len;
172 }
173 
174 static ssize_t xgmac_reg_addr_read(struct file *filp, char __user *buffer,
175 				   size_t count, loff_t *ppos)
176 {
177 	struct xgbe_prv_data *pdata = filp->private_data;
178 
179 	return xgbe_common_read(buffer, count, ppos, pdata->debugfs_xgmac_reg);
180 }
181 
182 static ssize_t xgmac_reg_addr_write(struct file *filp,
183 				    const char __user *buffer,
184 				    size_t count, loff_t *ppos)
185 {
186 	struct xgbe_prv_data *pdata = filp->private_data;
187 
188 	return xgbe_common_write(buffer, count, ppos,
189 				 &pdata->debugfs_xgmac_reg);
190 }
191 
192 static ssize_t xgmac_reg_value_read(struct file *filp, char __user *buffer,
193 				    size_t count, loff_t *ppos)
194 {
195 	struct xgbe_prv_data *pdata = filp->private_data;
196 	unsigned int value;
197 
198 	value = XGMAC_IOREAD(pdata, pdata->debugfs_xgmac_reg);
199 
200 	return xgbe_common_read(buffer, count, ppos, value);
201 }
202 
203 static ssize_t xgmac_reg_value_write(struct file *filp,
204 				     const char __user *buffer,
205 				     size_t count, loff_t *ppos)
206 {
207 	struct xgbe_prv_data *pdata = filp->private_data;
208 	unsigned int value;
209 	ssize_t len;
210 
211 	len = xgbe_common_write(buffer, count, ppos, &value);
212 	if (len < 0)
213 		return len;
214 
215 	XGMAC_IOWRITE(pdata, pdata->debugfs_xgmac_reg, value);
216 
217 	return len;
218 }
219 
220 static const struct file_operations xgmac_reg_addr_fops = {
221 	.owner = THIS_MODULE,
222 	.open = simple_open,
223 	.read =  xgmac_reg_addr_read,
224 	.write = xgmac_reg_addr_write,
225 };
226 
227 static const struct file_operations xgmac_reg_value_fops = {
228 	.owner = THIS_MODULE,
229 	.open = simple_open,
230 	.read =  xgmac_reg_value_read,
231 	.write = xgmac_reg_value_write,
232 };
233 
234 static ssize_t xpcs_mmd_read(struct file *filp, char __user *buffer,
235 			     size_t count, loff_t *ppos)
236 {
237 	struct xgbe_prv_data *pdata = filp->private_data;
238 
239 	return xgbe_common_read(buffer, count, ppos, pdata->debugfs_xpcs_mmd);
240 }
241 
242 static ssize_t xpcs_mmd_write(struct file *filp, const char __user *buffer,
243 			      size_t count, loff_t *ppos)
244 {
245 	struct xgbe_prv_data *pdata = filp->private_data;
246 
247 	return xgbe_common_write(buffer, count, ppos,
248 				 &pdata->debugfs_xpcs_mmd);
249 }
250 
251 static ssize_t xpcs_reg_addr_read(struct file *filp, char __user *buffer,
252 				  size_t count, loff_t *ppos)
253 {
254 	struct xgbe_prv_data *pdata = filp->private_data;
255 
256 	return xgbe_common_read(buffer, count, ppos, pdata->debugfs_xpcs_reg);
257 }
258 
259 static ssize_t xpcs_reg_addr_write(struct file *filp, const char __user *buffer,
260 				   size_t count, loff_t *ppos)
261 {
262 	struct xgbe_prv_data *pdata = filp->private_data;
263 
264 	return xgbe_common_write(buffer, count, ppos,
265 				 &pdata->debugfs_xpcs_reg);
266 }
267 
268 static ssize_t xpcs_reg_value_read(struct file *filp, char __user *buffer,
269 				   size_t count, loff_t *ppos)
270 {
271 	struct xgbe_prv_data *pdata = filp->private_data;
272 	unsigned int value;
273 
274 	value = XMDIO_READ(pdata, pdata->debugfs_xpcs_mmd,
275 			   pdata->debugfs_xpcs_reg);
276 
277 	return xgbe_common_read(buffer, count, ppos, value);
278 }
279 
280 static ssize_t xpcs_reg_value_write(struct file *filp,
281 				    const char __user *buffer,
282 				    size_t count, loff_t *ppos)
283 {
284 	struct xgbe_prv_data *pdata = filp->private_data;
285 	unsigned int value;
286 	ssize_t len;
287 
288 	len = xgbe_common_write(buffer, count, ppos, &value);
289 	if (len < 0)
290 		return len;
291 
292 	XMDIO_WRITE(pdata, pdata->debugfs_xpcs_mmd, pdata->debugfs_xpcs_reg,
293 		    value);
294 
295 	return len;
296 }
297 
298 static const struct file_operations xpcs_mmd_fops = {
299 	.owner = THIS_MODULE,
300 	.open = simple_open,
301 	.read =  xpcs_mmd_read,
302 	.write = xpcs_mmd_write,
303 };
304 
305 static const struct file_operations xpcs_reg_addr_fops = {
306 	.owner = THIS_MODULE,
307 	.open = simple_open,
308 	.read =  xpcs_reg_addr_read,
309 	.write = xpcs_reg_addr_write,
310 };
311 
312 static const struct file_operations xpcs_reg_value_fops = {
313 	.owner = THIS_MODULE,
314 	.open = simple_open,
315 	.read =  xpcs_reg_value_read,
316 	.write = xpcs_reg_value_write,
317 };
318 
319 void xgbe_debugfs_init(struct xgbe_prv_data *pdata)
320 {
321 	struct dentry *pfile;
322 	char *buf;
323 
324 	/* Set defaults */
325 	pdata->debugfs_xgmac_reg = 0;
326 	pdata->debugfs_xpcs_mmd = 1;
327 	pdata->debugfs_xpcs_reg = 0;
328 
329 	buf = kasprintf(GFP_KERNEL, "amd-xgbe-%s", pdata->netdev->name);
330 	pdata->xgbe_debugfs = debugfs_create_dir(buf, NULL);
331 	if (pdata->xgbe_debugfs == NULL) {
332 		netdev_err(pdata->netdev, "debugfs_create_dir failed\n");
333 		return;
334 	}
335 
336 	pfile = debugfs_create_file("xgmac_register", 0600,
337 				    pdata->xgbe_debugfs, pdata,
338 				    &xgmac_reg_addr_fops);
339 	if (!pfile)
340 		netdev_err(pdata->netdev, "debugfs_create_file failed\n");
341 
342 	pfile = debugfs_create_file("xgmac_register_value", 0600,
343 				    pdata->xgbe_debugfs, pdata,
344 				    &xgmac_reg_value_fops);
345 	if (!pfile)
346 		netdev_err(pdata->netdev, "debugfs_create_file failed\n");
347 
348 	pfile = debugfs_create_file("xpcs_mmd", 0600,
349 				    pdata->xgbe_debugfs, pdata,
350 				    &xpcs_mmd_fops);
351 	if (!pfile)
352 		netdev_err(pdata->netdev, "debugfs_create_file failed\n");
353 
354 	pfile = debugfs_create_file("xpcs_register", 0600,
355 				    pdata->xgbe_debugfs, pdata,
356 				    &xpcs_reg_addr_fops);
357 	if (!pfile)
358 		netdev_err(pdata->netdev, "debugfs_create_file failed\n");
359 
360 	pfile = debugfs_create_file("xpcs_register_value", 0600,
361 				    pdata->xgbe_debugfs, pdata,
362 				    &xpcs_reg_value_fops);
363 	if (!pfile)
364 		netdev_err(pdata->netdev, "debugfs_create_file failed\n");
365 
366 	kfree(buf);
367 }
368 
369 void xgbe_debugfs_exit(struct xgbe_prv_data *pdata)
370 {
371 	debugfs_remove_recursive(pdata->xgbe_debugfs);
372 	pdata->xgbe_debugfs = NULL;
373 }
374