1 /*
2 * drivers/net/gianfar_sysfs.c
3 *
4 * Gianfar Ethernet Driver
5 * This driver is designed for the non-CPM ethernet controllers
6 * on the 85xx and 83xx family of integrated processors
7 * Based on 8260_io/fcc_enet.c
8 *
9 * Author: Andy Fleming
10 * Maintainer: Kumar Gala (galak@kernel.crashing.org)
11 *
12 * Copyright (c) 2002-2005 Freescale Semiconductor, Inc.
13 *
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License as published by the
16 * Free Software Foundation; either version 2 of the License, or (at your
17 * option) any later version.
18 *
19 * Sysfs file creation and management
20 */
21
22 #include <linux/kernel.h>
23 #include <linux/string.h>
24 #include <linux/errno.h>
25 #include <linux/unistd.h>
26 #include <linux/slab.h>
27 #include <linux/init.h>
28 #include <linux/delay.h>
29 #include <linux/etherdevice.h>
30 #include <linux/spinlock.h>
31 #include <linux/mm.h>
32 #include <linux/device.h>
33
34 #include <asm/uaccess.h>
35 #include <linux/module.h>
36
37 #include "gianfar.h"
38
39 static ssize_t gfar_show_bd_stash(struct device *dev,
40 struct device_attribute *attr, char *buf)
41 {
42 struct gfar_private *priv = netdev_priv(to_net_dev(dev));
43
44 return sprintf(buf, "%s\n", priv->bd_stash_en ? "on" : "off");
45 }
46
47 static ssize_t gfar_set_bd_stash(struct device *dev,
48 struct device_attribute *attr,
49 const char *buf, size_t count)
50 {
51 struct gfar_private *priv = netdev_priv(to_net_dev(dev));
52 int new_setting = 0;
53 u32 temp;
54 unsigned long flags;
55
56 if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BD_STASHING))
57 return count;
58
59 /* Find out the new setting */
60 if (!strncmp("on", buf, count - 1) || !strncmp("1", buf, count - 1))
61 new_setting = 1;
62 else if (!strncmp("off", buf, count - 1)
63 || !strncmp("", buf, count - 1))
64 new_setting = 0;
65 else
66 return count;
67
68 spin_lock_irqsave(&priv->rxlock, flags);
69
70 /* Set the new stashing value */
71 priv->bd_stash_en = new_setting;
72
73 temp = gfar_read(&priv->regs->attr);
74
75 if (new_setting)
76 temp |= ATTR_BDSTASH;
77 else
78 temp &= ~(ATTR_BDSTASH);
79
80 gfar_write(&priv->regs->attr, temp);
81
82 spin_unlock_irqrestore(&priv->rxlock, flags);
83
84 return count;
85 }
86
87 static DEVICE_ATTR(bd_stash, 0644, gfar_show_bd_stash, gfar_set_bd_stash);
88
89 static ssize_t gfar_show_rx_stash_size(struct device *dev,
90 struct device_attribute *attr, char *buf)
91 {
92 struct gfar_private *priv = netdev_priv(to_net_dev(dev));
93
94 return sprintf(buf, "%d\n", priv->rx_stash_size);
95 }
96
97 static ssize_t gfar_set_rx_stash_size(struct device *dev,
98 struct device_attribute *attr,
99 const char *buf, size_t count)
100 {
101 struct gfar_private *priv = netdev_priv(to_net_dev(dev));
102 unsigned int length = simple_strtoul(buf, NULL, 0);
103 u32 temp;
104 unsigned long flags;
105
106 if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BUF_STASHING))
107 return count;
108
109 spin_lock_irqsave(&priv->rxlock, flags);
110 if (length > priv->rx_buffer_size)
111 goto out;
112
113 if (length == priv->rx_stash_size)
114 goto out;
115
116 priv->rx_stash_size = length;
117
118 temp = gfar_read(&priv->regs->attreli);
119 temp &= ~ATTRELI_EL_MASK;
120 temp |= ATTRELI_EL(length);
121 gfar_write(&priv->regs->attreli, temp);
122
123 /* Turn stashing on/off as appropriate */
124 temp = gfar_read(&priv->regs->attr);
125
126 if (length)
127 temp |= ATTR_BUFSTASH;
128 else
129 temp &= ~(ATTR_BUFSTASH);
130
131 gfar_write(&priv->regs->attr, temp);
132
133 out:
134 spin_unlock_irqrestore(&priv->rxlock, flags);
135
136 return count;
137 }
138
139 static DEVICE_ATTR(rx_stash_size, 0644, gfar_show_rx_stash_size,
140 gfar_set_rx_stash_size);
141
142 /* Stashing will only be enabled when rx_stash_size != 0 */
143 static ssize_t gfar_show_rx_stash_index(struct device *dev,
144 struct device_attribute *attr,
145 char *buf)
146 {
147 struct gfar_private *priv = netdev_priv(to_net_dev(dev));
148
149 return sprintf(buf, "%d\n", priv->rx_stash_index);
150 }
151
152 static ssize_t gfar_set_rx_stash_index(struct device *dev,
153 struct device_attribute *attr,
154 const char *buf, size_t count)
155 {
156 struct gfar_private *priv = netdev_priv(to_net_dev(dev));
157 unsigned short index = simple_strtoul(buf, NULL, 0);
158 u32 temp;
159 unsigned long flags;
160
161 if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BUF_STASHING))
162 return count;
163
164 spin_lock_irqsave(&priv->rxlock, flags);
165 if (index > priv->rx_stash_size)
166 goto out;
167
168 if (index == priv->rx_stash_index)
169 goto out;
170
171 priv->rx_stash_index = index;
172
173 temp = gfar_read(&priv->regs->attreli);
174 temp &= ~ATTRELI_EI_MASK;
175 temp |= ATTRELI_EI(index);
176 gfar_write(&priv->regs->attreli, flags);
177
178 out:
179 spin_unlock_irqrestore(&priv->rxlock, flags);
180
181 return count;
182 }
183
184 static DEVICE_ATTR(rx_stash_index, 0644, gfar_show_rx_stash_index,
185 gfar_set_rx_stash_index);
186
187 static ssize_t gfar_show_fifo_threshold(struct device *dev,
188 struct device_attribute *attr,
189 char *buf)
190 {
191 struct gfar_private *priv = netdev_priv(to_net_dev(dev));
192
193 return sprintf(buf, "%d\n", priv->fifo_threshold);
194 }
195
196 static ssize_t gfar_set_fifo_threshold(struct device *dev,
197 struct device_attribute *attr,
198 const char *buf, size_t count)
199 {
200 struct gfar_private *priv = netdev_priv(to_net_dev(dev));
201 unsigned int length = simple_strtoul(buf, NULL, 0);
202 u32 temp;
203 unsigned long flags;
204
205 if (length > GFAR_MAX_FIFO_THRESHOLD)
206 return count;
207
208 spin_lock_irqsave(&priv->txlock, flags);
209
210 priv->fifo_threshold = length;
211
212 temp = gfar_read(&priv->regs->fifo_tx_thr);
213 temp &= ~FIFO_TX_THR_MASK;
214 temp |= length;
215 gfar_write(&priv->regs->fifo_tx_thr, temp);
216
217 spin_unlock_irqrestore(&priv->txlock, flags);
218
219 return count;
220 }
221
222 static DEVICE_ATTR(fifo_threshold, 0644, gfar_show_fifo_threshold,
223 gfar_set_fifo_threshold);
224
225 static ssize_t gfar_show_fifo_starve(struct device *dev,
226 struct device_attribute *attr, char *buf)
227 {
228 struct gfar_private *priv = netdev_priv(to_net_dev(dev));
229
230 return sprintf(buf, "%d\n", priv->fifo_starve);
231 }
232
233 static ssize_t gfar_set_fifo_starve(struct device *dev,
234 struct device_attribute *attr,
235 const char *buf, size_t count)
236 {
237 struct gfar_private *priv = netdev_priv(to_net_dev(dev));
238 unsigned int num = simple_strtoul(buf, NULL, 0);
239 u32 temp;
240 unsigned long flags;
241
242 if (num > GFAR_MAX_FIFO_STARVE)
243 return count;
244
245 spin_lock_irqsave(&priv->txlock, flags);
246
247 priv->fifo_starve = num;
248
249 temp = gfar_read(&priv->regs->fifo_tx_starve);
250 temp &= ~FIFO_TX_STARVE_MASK;
251 temp |= num;
252 gfar_write(&priv->regs->fifo_tx_starve, temp);
253
254 spin_unlock_irqrestore(&priv->txlock, flags);
255
256 return count;
257 }
258
259 static DEVICE_ATTR(fifo_starve, 0644, gfar_show_fifo_starve,
260 gfar_set_fifo_starve);
261
262 static ssize_t gfar_show_fifo_starve_off(struct device *dev,
263 struct device_attribute *attr,
264 char *buf)
265 {
266 struct gfar_private *priv = netdev_priv(to_net_dev(dev));
267
268 return sprintf(buf, "%d\n", priv->fifo_starve_off);
269 }
270
271 static ssize_t gfar_set_fifo_starve_off(struct device *dev,
272 struct device_attribute *attr,
273 const char *buf, size_t count)
274 {
275 struct gfar_private *priv = netdev_priv(to_net_dev(dev));
276 unsigned int num = simple_strtoul(buf, NULL, 0);
277 u32 temp;
278 unsigned long flags;
279
280 if (num > GFAR_MAX_FIFO_STARVE_OFF)
281 return count;
282
283 spin_lock_irqsave(&priv->txlock, flags);
284
285 priv->fifo_starve_off = num;
286
287 temp = gfar_read(&priv->regs->fifo_tx_starve_shutoff);
288 temp &= ~FIFO_TX_STARVE_OFF_MASK;
289 temp |= num;
290 gfar_write(&priv->regs->fifo_tx_starve_shutoff, temp);
291
292 spin_unlock_irqrestore(&priv->txlock, flags);
293
294 return count;
295 }
296
297 static DEVICE_ATTR(fifo_starve_off, 0644, gfar_show_fifo_starve_off,
298 gfar_set_fifo_starve_off);
299
300 void gfar_init_sysfs(struct net_device *dev)
301 {
302 struct gfar_private *priv = netdev_priv(dev);
303 int rc;
304
305 /* Initialize the default values */
306 priv->fifo_threshold = DEFAULT_FIFO_TX_THR;
307 priv->fifo_starve = DEFAULT_FIFO_TX_STARVE;
308 priv->fifo_starve_off = DEFAULT_FIFO_TX_STARVE_OFF;
309
310 /* Create our sysfs files */
311 rc = device_create_file(&dev->dev, &dev_attr_bd_stash);
312 rc |= device_create_file(&dev->dev, &dev_attr_rx_stash_size);
313 rc |= device_create_file(&dev->dev, &dev_attr_rx_stash_index);
314 rc |= device_create_file(&dev->dev, &dev_attr_fifo_threshold);
315 rc |= device_create_file(&dev->dev, &dev_attr_fifo_starve);
316 rc |= device_create_file(&dev->dev, &dev_attr_fifo_starve_off);
317 if (rc)
318 dev_err(&dev->dev, "Error creating gianfar sysfs files.\n");
319 }
320
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