[TUN]: Fix RTNL-locking in tun/tap driver
[linux-2.6] / drivers / net / gianfar_sysfs.c
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 #include <linux/version.h>
37
38 #include "gianfar.h"
39
40 static ssize_t gfar_show_bd_stash(struct device *dev,
41                                   struct device_attribute *attr, char *buf)
42 {
43         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
44
45         return sprintf(buf, "%s\n", priv->bd_stash_en ? "on" : "off");
46 }
47
48 static ssize_t gfar_set_bd_stash(struct device *dev,
49                                  struct device_attribute *attr,
50                                  const char *buf, size_t count)
51 {
52         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
53         int new_setting = 0;
54         u32 temp;
55         unsigned long flags;
56
57         /* Find out the new setting */
58         if (!strncmp("on", buf, count - 1) || !strncmp("1", buf, count - 1))
59                 new_setting = 1;
60         else if (!strncmp("off", buf, count - 1)
61                  || !strncmp("0", buf, count - 1))
62                 new_setting = 0;
63         else
64                 return count;
65
66         spin_lock_irqsave(&priv->rxlock, flags);
67
68         /* Set the new stashing value */
69         priv->bd_stash_en = new_setting;
70
71         temp = gfar_read(&priv->regs->attr);
72
73         if (new_setting)
74                 temp |= ATTR_BDSTASH;
75         else
76                 temp &= ~(ATTR_BDSTASH);
77
78         gfar_write(&priv->regs->attr, temp);
79
80         spin_unlock_irqrestore(&priv->rxlock, flags);
81
82         return count;
83 }
84
85 DEVICE_ATTR(bd_stash, 0644, gfar_show_bd_stash, gfar_set_bd_stash);
86
87 static ssize_t gfar_show_rx_stash_size(struct device *dev,
88                                        struct device_attribute *attr, char *buf)
89 {
90         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
91
92         return sprintf(buf, "%d\n", priv->rx_stash_size);
93 }
94
95 static ssize_t gfar_set_rx_stash_size(struct device *dev,
96                                       struct device_attribute *attr,
97                                       const char *buf, size_t count)
98 {
99         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
100         unsigned int length = simple_strtoul(buf, NULL, 0);
101         u32 temp;
102         unsigned long flags;
103
104         spin_lock_irqsave(&priv->rxlock, flags);
105         if (length > priv->rx_buffer_size)
106                 return count;
107
108         if (length == priv->rx_stash_size)
109                 return count;
110
111         priv->rx_stash_size = length;
112
113         temp = gfar_read(&priv->regs->attreli);
114         temp &= ~ATTRELI_EL_MASK;
115         temp |= ATTRELI_EL(length);
116         gfar_write(&priv->regs->attreli, temp);
117
118         /* Turn stashing on/off as appropriate */
119         temp = gfar_read(&priv->regs->attr);
120
121         if (length)
122                 temp |= ATTR_BUFSTASH;
123         else
124                 temp &= ~(ATTR_BUFSTASH);
125
126         gfar_write(&priv->regs->attr, temp);
127
128         spin_unlock_irqrestore(&priv->rxlock, flags);
129
130         return count;
131 }
132
133 DEVICE_ATTR(rx_stash_size, 0644, gfar_show_rx_stash_size,
134             gfar_set_rx_stash_size);
135
136 /* Stashing will only be enabled when rx_stash_size != 0 */
137 static ssize_t gfar_show_rx_stash_index(struct device *dev,
138                                         struct device_attribute *attr,
139                                         char *buf)
140 {
141         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
142
143         return sprintf(buf, "%d\n", priv->rx_stash_index);
144 }
145
146 static ssize_t gfar_set_rx_stash_index(struct device *dev,
147                                        struct device_attribute *attr,
148                                        const char *buf, size_t count)
149 {
150         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
151         unsigned short index = simple_strtoul(buf, NULL, 0);
152         u32 temp;
153         unsigned long flags;
154
155         spin_lock_irqsave(&priv->rxlock, flags);
156         if (index > priv->rx_stash_size)
157                 return count;
158
159         if (index == priv->rx_stash_index)
160                 return count;
161
162         priv->rx_stash_index = index;
163
164         temp = gfar_read(&priv->regs->attreli);
165         temp &= ~ATTRELI_EI_MASK;
166         temp |= ATTRELI_EI(index);
167         gfar_write(&priv->regs->attreli, flags);
168
169         spin_unlock_irqrestore(&priv->rxlock, flags);
170
171         return count;
172 }
173
174 DEVICE_ATTR(rx_stash_index, 0644, gfar_show_rx_stash_index,
175             gfar_set_rx_stash_index);
176
177 static ssize_t gfar_show_fifo_threshold(struct device *dev,
178                                         struct device_attribute *attr,
179                                         char *buf)
180 {
181         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
182
183         return sprintf(buf, "%d\n", priv->fifo_threshold);
184 }
185
186 static ssize_t gfar_set_fifo_threshold(struct device *dev,
187                                        struct device_attribute *attr,
188                                        const char *buf, size_t count)
189 {
190         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
191         unsigned int length = simple_strtoul(buf, NULL, 0);
192         u32 temp;
193         unsigned long flags;
194
195         if (length > GFAR_MAX_FIFO_THRESHOLD)
196                 return count;
197
198         spin_lock_irqsave(&priv->txlock, flags);
199
200         priv->fifo_threshold = length;
201
202         temp = gfar_read(&priv->regs->fifo_tx_thr);
203         temp &= ~FIFO_TX_THR_MASK;
204         temp |= length;
205         gfar_write(&priv->regs->fifo_tx_thr, temp);
206
207         spin_unlock_irqrestore(&priv->txlock, flags);
208
209         return count;
210 }
211
212 DEVICE_ATTR(fifo_threshold, 0644, gfar_show_fifo_threshold,
213             gfar_set_fifo_threshold);
214
215 static ssize_t gfar_show_fifo_starve(struct device *dev,
216                                      struct device_attribute *attr, char *buf)
217 {
218         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
219
220         return sprintf(buf, "%d\n", priv->fifo_starve);
221 }
222
223 static ssize_t gfar_set_fifo_starve(struct device *dev,
224                                     struct device_attribute *attr,
225                                     const char *buf, size_t count)
226 {
227         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
228         unsigned int num = simple_strtoul(buf, NULL, 0);
229         u32 temp;
230         unsigned long flags;
231
232         if (num > GFAR_MAX_FIFO_STARVE)
233                 return count;
234
235         spin_lock_irqsave(&priv->txlock, flags);
236
237         priv->fifo_starve = num;
238
239         temp = gfar_read(&priv->regs->fifo_tx_starve);
240         temp &= ~FIFO_TX_STARVE_MASK;
241         temp |= num;
242         gfar_write(&priv->regs->fifo_tx_starve, temp);
243
244         spin_unlock_irqrestore(&priv->txlock, flags);
245
246         return count;
247 }
248
249 DEVICE_ATTR(fifo_starve, 0644, gfar_show_fifo_starve, gfar_set_fifo_starve);
250
251 static ssize_t gfar_show_fifo_starve_off(struct device *dev,
252                                          struct device_attribute *attr,
253                                          char *buf)
254 {
255         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
256
257         return sprintf(buf, "%d\n", priv->fifo_starve_off);
258 }
259
260 static ssize_t gfar_set_fifo_starve_off(struct device *dev,
261                                         struct device_attribute *attr,
262                                         const char *buf, size_t count)
263 {
264         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
265         unsigned int num = simple_strtoul(buf, NULL, 0);
266         u32 temp;
267         unsigned long flags;
268
269         if (num > GFAR_MAX_FIFO_STARVE_OFF)
270                 return count;
271
272         spin_lock_irqsave(&priv->txlock, flags);
273
274         priv->fifo_starve_off = num;
275
276         temp = gfar_read(&priv->regs->fifo_tx_starve_shutoff);
277         temp &= ~FIFO_TX_STARVE_OFF_MASK;
278         temp |= num;
279         gfar_write(&priv->regs->fifo_tx_starve_shutoff, temp);
280
281         spin_unlock_irqrestore(&priv->txlock, flags);
282
283         return count;
284 }
285
286 DEVICE_ATTR(fifo_starve_off, 0644, gfar_show_fifo_starve_off,
287             gfar_set_fifo_starve_off);
288
289 void gfar_init_sysfs(struct net_device *dev)
290 {
291         struct gfar_private *priv = netdev_priv(dev);
292         int rc;
293
294         /* Initialize the default values */
295         priv->rx_stash_size = DEFAULT_STASH_LENGTH;
296         priv->rx_stash_index = DEFAULT_STASH_INDEX;
297         priv->fifo_threshold = DEFAULT_FIFO_TX_THR;
298         priv->fifo_starve = DEFAULT_FIFO_TX_STARVE;
299         priv->fifo_starve_off = DEFAULT_FIFO_TX_STARVE_OFF;
300         priv->bd_stash_en = DEFAULT_BD_STASH;
301
302         /* Create our sysfs files */
303         rc = device_create_file(&dev->dev, &dev_attr_bd_stash);
304         rc |= device_create_file(&dev->dev, &dev_attr_rx_stash_size);
305         rc |= device_create_file(&dev->dev, &dev_attr_rx_stash_index);
306         rc |= device_create_file(&dev->dev, &dev_attr_fifo_threshold);
307         rc |= device_create_file(&dev->dev, &dev_attr_fifo_starve);
308         rc |= device_create_file(&dev->dev, &dev_attr_fifo_starve_off);
309         if (rc)
310                 dev_err(&dev->dev, "Error creating gianfar sysfs files.\n");
311 }