gianfar: Fix a locking bug in gianfar's sysfs code
[linux-2.6.git] / 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                 goto out;
107
108         if (length == priv->rx_stash_size)
109                 goto out;
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 out:
129         spin_unlock_irqrestore(&priv->rxlock, flags);
130
131         return count;
132 }
133
134 DEVICE_ATTR(rx_stash_size, 0644, gfar_show_rx_stash_size,
135             gfar_set_rx_stash_size);
136
137 /* Stashing will only be enabled when rx_stash_size != 0 */
138 static ssize_t gfar_show_rx_stash_index(struct device *dev,
139                                         struct device_attribute *attr,
140                                         char *buf)
141 {
142         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
143
144         return sprintf(buf, "%d\n", priv->rx_stash_index);
145 }
146
147 static ssize_t gfar_set_rx_stash_index(struct device *dev,
148                                        struct device_attribute *attr,
149                                        const char *buf, size_t count)
150 {
151         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
152         unsigned short index = simple_strtoul(buf, NULL, 0);
153         u32 temp;
154         unsigned long flags;
155
156         spin_lock_irqsave(&priv->rxlock, flags);
157         if (index > priv->rx_stash_size)
158                 goto out;
159
160         if (index == priv->rx_stash_index)
161                 goto out;
162
163         priv->rx_stash_index = index;
164
165         temp = gfar_read(&priv->regs->attreli);
166         temp &= ~ATTRELI_EI_MASK;
167         temp |= ATTRELI_EI(index);
168         gfar_write(&priv->regs->attreli, flags);
169
170 out:
171         spin_unlock_irqrestore(&priv->rxlock, flags);
172
173         return count;
174 }
175
176 DEVICE_ATTR(rx_stash_index, 0644, gfar_show_rx_stash_index,
177             gfar_set_rx_stash_index);
178
179 static ssize_t gfar_show_fifo_threshold(struct device *dev,
180                                         struct device_attribute *attr,
181                                         char *buf)
182 {
183         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
184
185         return sprintf(buf, "%d\n", priv->fifo_threshold);
186 }
187
188 static ssize_t gfar_set_fifo_threshold(struct device *dev,
189                                        struct device_attribute *attr,
190                                        const char *buf, size_t count)
191 {
192         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
193         unsigned int length = simple_strtoul(buf, NULL, 0);
194         u32 temp;
195         unsigned long flags;
196
197         if (length > GFAR_MAX_FIFO_THRESHOLD)
198                 return count;
199
200         spin_lock_irqsave(&priv->txlock, flags);
201
202         priv->fifo_threshold = length;
203
204         temp = gfar_read(&priv->regs->fifo_tx_thr);
205         temp &= ~FIFO_TX_THR_MASK;
206         temp |= length;
207         gfar_write(&priv->regs->fifo_tx_thr, temp);
208
209         spin_unlock_irqrestore(&priv->txlock, flags);
210
211         return count;
212 }
213
214 DEVICE_ATTR(fifo_threshold, 0644, gfar_show_fifo_threshold,
215             gfar_set_fifo_threshold);
216
217 static ssize_t gfar_show_fifo_starve(struct device *dev,
218                                      struct device_attribute *attr, char *buf)
219 {
220         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
221
222         return sprintf(buf, "%d\n", priv->fifo_starve);
223 }
224
225 static ssize_t gfar_set_fifo_starve(struct device *dev,
226                                     struct device_attribute *attr,
227                                     const char *buf, size_t count)
228 {
229         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
230         unsigned int num = simple_strtoul(buf, NULL, 0);
231         u32 temp;
232         unsigned long flags;
233
234         if (num > GFAR_MAX_FIFO_STARVE)
235                 return count;
236
237         spin_lock_irqsave(&priv->txlock, flags);
238
239         priv->fifo_starve = num;
240
241         temp = gfar_read(&priv->regs->fifo_tx_starve);
242         temp &= ~FIFO_TX_STARVE_MASK;
243         temp |= num;
244         gfar_write(&priv->regs->fifo_tx_starve, temp);
245
246         spin_unlock_irqrestore(&priv->txlock, flags);
247
248         return count;
249 }
250
251 DEVICE_ATTR(fifo_starve, 0644, gfar_show_fifo_starve, gfar_set_fifo_starve);
252
253 static ssize_t gfar_show_fifo_starve_off(struct device *dev,
254                                          struct device_attribute *attr,
255                                          char *buf)
256 {
257         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
258
259         return sprintf(buf, "%d\n", priv->fifo_starve_off);
260 }
261
262 static ssize_t gfar_set_fifo_starve_off(struct device *dev,
263                                         struct device_attribute *attr,
264                                         const char *buf, size_t count)
265 {
266         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
267         unsigned int num = simple_strtoul(buf, NULL, 0);
268         u32 temp;
269         unsigned long flags;
270
271         if (num > GFAR_MAX_FIFO_STARVE_OFF)
272                 return count;
273
274         spin_lock_irqsave(&priv->txlock, flags);
275
276         priv->fifo_starve_off = num;
277
278         temp = gfar_read(&priv->regs->fifo_tx_starve_shutoff);
279         temp &= ~FIFO_TX_STARVE_OFF_MASK;
280         temp |= num;
281         gfar_write(&priv->regs->fifo_tx_starve_shutoff, temp);
282
283         spin_unlock_irqrestore(&priv->txlock, flags);
284
285         return count;
286 }
287
288 DEVICE_ATTR(fifo_starve_off, 0644, gfar_show_fifo_starve_off,
289             gfar_set_fifo_starve_off);
290
291 void gfar_init_sysfs(struct net_device *dev)
292 {
293         struct gfar_private *priv = netdev_priv(dev);
294         int rc;
295
296         /* Initialize the default values */
297         priv->rx_stash_size = DEFAULT_STASH_LENGTH;
298         priv->rx_stash_index = DEFAULT_STASH_INDEX;
299         priv->fifo_threshold = DEFAULT_FIFO_TX_THR;
300         priv->fifo_starve = DEFAULT_FIFO_TX_STARVE;
301         priv->fifo_starve_off = DEFAULT_FIFO_TX_STARVE_OFF;
302         priv->bd_stash_en = DEFAULT_BD_STASH;
303
304         /* Create our sysfs files */
305         rc = device_create_file(&dev->dev, &dev_attr_bd_stash);
306         rc |= device_create_file(&dev->dev, &dev_attr_rx_stash_size);
307         rc |= device_create_file(&dev->dev, &dev_attr_rx_stash_index);
308         rc |= device_create_file(&dev->dev, &dev_attr_fifo_threshold);
309         rc |= device_create_file(&dev->dev, &dev_attr_fifo_starve);
310         rc |= device_create_file(&dev->dev, &dev_attr_fifo_starve_off);
311         if (rc)
312                 dev_err(&dev->dev, "Error creating gianfar sysfs files.\n");
313 }