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 }