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/config.h>
  23 #include <linux/kernel.h>
  24 #include <linux/sched.h>
  25 #include <linux/string.h>
  26 #include <linux/errno.h>
  27 #include <linux/unistd.h>
  28 #include <linux/slab.h>
  29 #include <linux/init.h>
  30 #include <linux/delay.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/mm.h>
  34 #include <linux/device.h>
  35
  36 #include <asm/uaccess.h>
  37 #include <linux/module.h>
  38 #include <linux/version.h>
  39
  40 #include "gianfar.h"
  41
  42 #define GFAR_ATTR(_name) \
  43 static ssize_t gfar_show_##_name(struct class_device *cdev, char *buf); \
  44 static ssize_t gfar_set_##_name(struct class_device *cdev, \
  45                 const char *buf, size_t count); \
  46 static CLASS_DEVICE_ATTR(_name, 0644, gfar_show_##_name, gfar_set_##_name)
  47
  48 #define GFAR_CREATE_FILE(_dev, _name) \
  49         class_device_create_file(&_dev->class_dev, &class_device_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 #define to_net_dev(cd) container_of(cd, struct net_device, class_dev)
  59
  60 static ssize_t gfar_show_bd_stash(struct class_device *cdev, char *buf)
  61 {
  62         struct net_device *dev = to_net_dev(cdev);
  63         struct gfar_private *priv = netdev_priv(dev);
  64
  65         return sprintf(buf, "%s\n", priv->bd_stash_en? "on" : "off");
  66 }
  67
  68 static ssize_t gfar_set_bd_stash(struct class_device *cdev,
  69                 const char *buf, size_t count)
  70 {
  71         struct net_device *dev = to_net_dev(cdev);
  72         struct gfar_private *priv = netdev_priv(dev);
  73         int new_setting = 0;
  74         u32 temp;
  75         unsigned long flags;
  76
  77         /* Find out the new setting */
  78         if (!strncmp("on", buf, count-1) || !strncmp("1", buf, count-1))
  79                 new_setting = 1;
  80         else if (!strncmp("off", buf, count-1) || !strncmp("0", buf, count-1))
  81                 new_setting = 0;
  82         else
  83                 return count;
  84
  85         spin_lock_irqsave(&priv->rxlock, flags);
  86
  87         /* Set the new stashing value */
  88         priv->bd_stash_en = new_setting;
  89
  90         temp = gfar_read(&priv->regs->attr);
  91
  92         if (new_setting)
  93                 temp |= ATTR_BDSTASH;
  94         else
  95                 temp &= ~(ATTR_BDSTASH);
  96
  97         gfar_write(&priv->regs->attr, temp);
  98
  99         spin_unlock_irqrestore(&priv->rxlock, flags);
 100
 101         return count;
 102 }
 103
 104 static ssize_t gfar_show_rx_stash_size(struct class_device *cdev, char *buf)
 105 {
 106         struct net_device *dev = to_net_dev(cdev);
 107         struct gfar_private *priv = netdev_priv(dev);
 108
 109         return sprintf(buf, "%d\n", priv->rx_stash_size);
 110 }
 111
 112 static ssize_t gfar_set_rx_stash_size(struct class_device *cdev,
 113                 const char *buf, size_t count)
 114 {
 115         struct net_device *dev = to_net_dev(cdev);
 116         struct gfar_private *priv = netdev_priv(dev);
 117         unsigned int length = simple_strtoul(buf, NULL, 0);
 118         u32 temp;
 119         unsigned long flags;
 120
 121         spin_lock_irqsave(&priv->rxlock, flags);
 122         if (length > priv->rx_buffer_size)
 123                 return count;
 124
 125         if (length == priv->rx_stash_size)
 126                 return count;
 127
 128         priv->rx_stash_size = length;
 129
 130         temp = gfar_read(&priv->regs->attreli);
 131         temp &= ~ATTRELI_EL_MASK;
 132         temp |= ATTRELI_EL(length);
 133         gfar_write(&priv->regs->attreli, temp);
 134
 135         /* Turn stashing on/off as appropriate */
 136         temp = gfar_read(&priv->regs->attr);
 137
 138         if (length)
 139                 temp |= ATTR_BUFSTASH;
 140         else
 141                 temp &= ~(ATTR_BUFSTASH);
 142
 143         gfar_write(&priv->regs->attr, temp);
 144
 145         spin_unlock_irqrestore(&priv->rxlock, flags);
 146
 147         return count;
 148 }
 149
 150
 151 /* Stashing will only be enabled when rx_stash_size != 0 */
 152 static ssize_t gfar_show_rx_stash_index(struct class_device *cdev, char *buf)
 153 {
 154         struct net_device *dev = to_net_dev(cdev);
 155         struct gfar_private *priv = netdev_priv(dev);
 156
 157         return sprintf(buf, "%d\n", priv->rx_stash_index);
 158 }
 159
 160 static ssize_t gfar_set_rx_stash_index(struct class_device *cdev,
 161                 const char *buf, size_t count)
 162 {
 163         struct net_device *dev = to_net_dev(cdev);
 164         struct gfar_private *priv = netdev_priv(dev);
 165         unsigned short index = simple_strtoul(buf, NULL, 0);
 166         u32 temp;
 167         unsigned long flags;
 168
 169         spin_lock_irqsave(&priv->rxlock, flags);
 170         if (index > priv->rx_stash_size)
 171                 return count;
 172
 173         if (index == priv->rx_stash_index)
 174                 return count;
 175
 176         priv->rx_stash_index = index;
 177
 178         temp = gfar_read(&priv->regs->attreli);
 179         temp &= ~ATTRELI_EI_MASK;
 180         temp |= ATTRELI_EI(index);
 181         gfar_write(&priv->regs->attreli, flags);
 182
 183         spin_unlock_irqrestore(&priv->rxlock, flags);
 184
 185         return count;
 186 }
 187
 188 static ssize_t gfar_show_fifo_threshold(struct class_device *cdev, char *buf)
 189 {
 190         struct net_device *dev = to_net_dev(cdev);
 191         struct gfar_private *priv = netdev_priv(dev);
 192
 193         return sprintf(buf, "%d\n", priv->fifo_threshold);
 194 }
 195
 196 static ssize_t gfar_set_fifo_threshold(struct class_device *cdev,
 197                 const char *buf, size_t count)
 198 {
 199         struct net_device *dev = to_net_dev(cdev);
 200         struct gfar_private *priv = netdev_priv(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 class_device *cdev, char *buf)
 223 {
 224         struct net_device *dev = to_net_dev(cdev);
 225         struct gfar_private *priv = netdev_priv(dev);
 226
 227         return sprintf(buf, "%d\n", priv->fifo_starve);
 228 }
 229
 230
 231 static ssize_t gfar_set_fifo_starve(struct class_device *cdev,
 232                 const char *buf, size_t count)
 233 {
 234         struct net_device *dev = to_net_dev(cdev);
 235         struct gfar_private *priv = netdev_priv(dev);
 236         unsigned int num = simple_strtoul(buf, NULL, 0);
 237         u32 temp;
 238         unsigned long flags;
 239
 240         if (num > GFAR_MAX_FIFO_STARVE)
 241                 return count;
 242
 243         spin_lock_irqsave(&priv->txlock, flags);
 244
 245         priv->fifo_starve = num;
 246
 247         temp = gfar_read(&priv->regs->fifo_tx_starve);
 248         temp &= ~FIFO_TX_STARVE_MASK;
 249         temp |= num;
 250         gfar_write(&priv->regs->fifo_tx_starve, temp);
 251
 252         spin_unlock_irqrestore(&priv->txlock, flags);
 253
 254         return count;
 255 }
 256
 257 static ssize_t gfar_show_fifo_starve_off(struct class_device *cdev, char *buf)
 258 {
 259         struct net_device *dev = to_net_dev(cdev);
 260         struct gfar_private *priv = netdev_priv(dev);
 261
 262         return sprintf(buf, "%d\n", priv->fifo_starve_off);
 263 }
 264
 265 static ssize_t gfar_set_fifo_starve_off(struct class_device *cdev,
 266                 const char *buf, size_t count)
 267 {
 268         struct net_device *dev = to_net_dev(cdev);
 269         struct gfar_private *priv = netdev_priv(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 }