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