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
  37 #include "gianfar.h"
  38
  39 static ssize_t gfar_show_bd_stash(struct device *dev,
  40                                   struct device_attribute *attr, char *buf)
  41 {
  42         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
  43
  44         return sprintf(buf, "%s\n", priv->bd_stash_en ? "on" : "off");
  45 }
  46
  47 static ssize_t gfar_set_bd_stash(struct device *dev,
  48                                  struct device_attribute *attr,
  49                                  const char *buf, size_t count)
  50 {
  51         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
  52         int new_setting = 0;
  53         u32 temp;
  54         unsigned long flags;
  55
  56         if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BD_STASHING))
  57                 return count;
  58
  59         /* Find out the new setting */
  60         if (!strncmp("on", buf, count - 1) || !strncmp("1", buf, count - 1))
  61                 new_setting = 1;
  62         else if (!strncmp("off", buf, count - 1)
  63                  || !strncmp("0", buf, count - 1))
  64                 new_setting = 0;
  65         else
  66                 return count;
  67
  68         spin_lock_irqsave(&priv->rxlock, flags);
  69
  70         /* Set the new stashing value */
  71         priv->bd_stash_en = new_setting;
  72
  73         temp = gfar_read(&priv->regs->attr);
  74
  75         if (new_setting)
  76                 temp |= ATTR_BDSTASH;
  77         else
  78                 temp &= ~(ATTR_BDSTASH);
  79
  80         gfar_write(&priv->regs->attr, temp);
  81
  82         spin_unlock_irqrestore(&priv->rxlock, flags);
  83
  84         return count;
  85 }
  86
  87 static DEVICE_ATTR(bd_stash, 0644, gfar_show_bd_stash, gfar_set_bd_stash);
  88
  89 static ssize_t gfar_show_rx_stash_size(struct device *dev,
  90                                        struct device_attribute *attr, char *buf)
  91 {
  92         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
  93
  94         return sprintf(buf, "%d\n", priv->rx_stash_size);
  95 }
  96
  97 static ssize_t gfar_set_rx_stash_size(struct device *dev,
  98                                       struct device_attribute *attr,
  99                                       const char *buf, size_t count)
 100 {
 101         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 102         unsigned int length = simple_strtoul(buf, NULL, 0);
 103         u32 temp;
 104         unsigned long flags;
 105
 106         if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BUF_STASHING))
 107                 return count;
 108
 109         spin_lock_irqsave(&priv->rxlock, flags);
 110         if (length > priv->rx_buffer_size)
 111                 goto out;
 112
 113         if (length == priv->rx_stash_size)
 114                 goto out;
 115
 116         priv->rx_stash_size = length;
 117
 118         temp = gfar_read(&priv->regs->attreli);
 119         temp &= ~ATTRELI_EL_MASK;
 120         temp |= ATTRELI_EL(length);
 121         gfar_write(&priv->regs->attreli, temp);
 122
 123         /* Turn stashing on/off as appropriate */
 124         temp = gfar_read(&priv->regs->attr);
 125
 126         if (length)
 127                 temp |= ATTR_BUFSTASH;
 128         else
 129                 temp &= ~(ATTR_BUFSTASH);
 130
 131         gfar_write(&priv->regs->attr, temp);
 132
 133 out:
 134         spin_unlock_irqrestore(&priv->rxlock, flags);
 135
 136         return count;
 137 }
 138
 139 static DEVICE_ATTR(rx_stash_size, 0644, gfar_show_rx_stash_size,
 140                    gfar_set_rx_stash_size);
 141
 142 /* Stashing will only be enabled when rx_stash_size != 0 */
 143 static ssize_t gfar_show_rx_stash_index(struct device *dev,
 144                                         struct device_attribute *attr,
 145                                         char *buf)
 146 {
 147         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 148
 149         return sprintf(buf, "%d\n", priv->rx_stash_index);
 150 }
 151
 152 static ssize_t gfar_set_rx_stash_index(struct device *dev,
 153                                        struct device_attribute *attr,
 154                                        const char *buf, size_t count)
 155 {
 156         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 157         unsigned short index = simple_strtoul(buf, NULL, 0);
 158         u32 temp;
 159         unsigned long flags;
 160
 161         if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BUF_STASHING))
 162                 return count;
 163
 164         spin_lock_irqsave(&priv->rxlock, flags);
 165         if (index > priv->rx_stash_size)
 166                 goto out;
 167
 168         if (index == priv->rx_stash_index)
 169                 goto out;
 170
 171         priv->rx_stash_index = index;
 172
 173         temp = gfar_read(&priv->regs->attreli);
 174         temp &= ~ATTRELI_EI_MASK;
 175         temp |= ATTRELI_EI(index);
 176         gfar_write(&priv->regs->attreli, flags);
 177
 178 out:
 179         spin_unlock_irqrestore(&priv->rxlock, flags);
 180
 181         return count;
 182 }
 183
 184 static DEVICE_ATTR(rx_stash_index, 0644, gfar_show_rx_stash_index,
 185                    gfar_set_rx_stash_index);
 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 DEVICE_ATTR(fifo_threshold, 0644, gfar_show_fifo_threshold,
 223                    gfar_set_fifo_threshold);
 224
 225 static ssize_t gfar_show_fifo_starve(struct device *dev,
 226                                      struct device_attribute *attr, char *buf)
 227 {
 228         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 229
 230         return sprintf(buf, "%d\n", priv->fifo_starve);
 231 }
 232
 233 static ssize_t gfar_set_fifo_starve(struct device *dev,
 234                                     struct device_attribute *attr,
 235                                     const char *buf, size_t count)
 236 {
 237         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 238         unsigned int num = simple_strtoul(buf, NULL, 0);
 239         u32 temp;
 240         unsigned long flags;
 241
 242         if (num > GFAR_MAX_FIFO_STARVE)
 243                 return count;
 244
 245         spin_lock_irqsave(&priv->txlock, flags);
 246
 247         priv->fifo_starve = num;
 248
 249         temp = gfar_read(&priv->regs->fifo_tx_starve);
 250         temp &= ~FIFO_TX_STARVE_MASK;
 251         temp |= num;
 252         gfar_write(&priv->regs->fifo_tx_starve, temp);
 253
 254         spin_unlock_irqrestore(&priv->txlock, flags);
 255
 256         return count;
 257 }
 258
 259 static DEVICE_ATTR(fifo_starve, 0644, gfar_show_fifo_starve,
 260                    gfar_set_fifo_starve);
 261
 262 static ssize_t gfar_show_fifo_starve_off(struct device *dev,
 263                                          struct device_attribute *attr,
 264                                          char *buf)
 265 {
 266         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 267
 268         return sprintf(buf, "%d\n", priv->fifo_starve_off);
 269 }
 270
 271 static ssize_t gfar_set_fifo_starve_off(struct device *dev,
 272                                         struct device_attribute *attr,
 273                                         const char *buf, size_t count)
 274 {
 275         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 276         unsigned int num = simple_strtoul(buf, NULL, 0);
 277         u32 temp;
 278         unsigned long flags;
 279
 280         if (num > GFAR_MAX_FIFO_STARVE_OFF)
 281                 return count;
 282
 283         spin_lock_irqsave(&priv->txlock, flags);
 284
 285         priv->fifo_starve_off = num;
 286
 287         temp = gfar_read(&priv->regs->fifo_tx_starve_shutoff);
 288         temp &= ~FIFO_TX_STARVE_OFF_MASK;
 289         temp |= num;
 290         gfar_write(&priv->regs->fifo_tx_starve_shutoff, temp);
 291
 292         spin_unlock_irqrestore(&priv->txlock, flags);
 293
 294         return count;
 295 }
 296
 297 static DEVICE_ATTR(fifo_starve_off, 0644, gfar_show_fifo_starve_off,
 298                    gfar_set_fifo_starve_off);
 299
 300 void gfar_init_sysfs(struct net_device *dev)
 301 {
 302         struct gfar_private *priv = netdev_priv(dev);
 303         int rc;
 304
 305         /* Initialize the default values */
 306         priv->fifo_threshold = DEFAULT_FIFO_TX_THR;
 307         priv->fifo_starve = DEFAULT_FIFO_TX_STARVE;
 308         priv->fifo_starve_off = DEFAULT_FIFO_TX_STARVE_OFF;
 309
 310         /* Create our sysfs files */
 311         rc = device_create_file(&dev->dev, &dev_attr_bd_stash);
 312         rc |= device_create_file(&dev->dev, &dev_attr_rx_stash_size);
 313         rc |= device_create_file(&dev->dev, &dev_attr_rx_stash_index);
 314         rc |= device_create_file(&dev->dev, &dev_attr_fifo_threshold);
 315         rc |= device_create_file(&dev->dev, &dev_attr_fifo_starve);
 316         rc |= device_create_file(&dev->dev, &dev_attr_fifo_starve_off);
 317         if (rc)
 318                 dev_err(&dev->dev, "Error creating gianfar sysfs files.\n");
 319 }