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   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         /* Find out the new setting */
  57         if (!strncmp("on", buf, count - 1) || !strncmp("1", buf, count - 1))
  58                 new_setting = 1;
  59         else if (!strncmp("off", buf, count - 1)
  60                  || !strncmp("0", buf, count - 1))
  61                 new_setting = 0;
  62         else
  63                 return count;
  64
  65         spin_lock_irqsave(&priv->rxlock, flags);
  66
  67         /* Set the new stashing value */
  68         priv->bd_stash_en = new_setting;
  69
  70         temp = gfar_read(&priv->regs->attr);
  71
  72         if (new_setting)
  73                 temp |= ATTR_BDSTASH;
  74         else
  75                 temp &= ~(ATTR_BDSTASH);
  76
  77         gfar_write(&priv->regs->attr, temp);
  78
  79         spin_unlock_irqrestore(&priv->rxlock, flags);
  80
  81         return count;
  82 }
  83
  84 DEVICE_ATTR(bd_stash, 0644, gfar_show_bd_stash, gfar_set_bd_stash);
  85
  86 static ssize_t gfar_show_rx_stash_size(struct device *dev,
  87                                        struct device_attribute *attr, char *buf)
  88 {
  89         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
  90
  91         return sprintf(buf, "%d\n", priv->rx_stash_size);
  92 }
  93
  94 static ssize_t gfar_set_rx_stash_size(struct device *dev,
  95                                       struct device_attribute *attr,
  96                                       const char *buf, size_t count)
  97 {
  98         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
  99         unsigned int length = simple_strtoul(buf, NULL, 0);
 100         u32 temp;
 101         unsigned long flags;
 102
 103         spin_lock_irqsave(&priv->rxlock, flags);
 104         if (length > priv->rx_buffer_size)
 105                 goto out;
 106
 107         if (length == priv->rx_stash_size)
 108                 goto out;
 109
 110         priv->rx_stash_size = length;
 111
 112         temp = gfar_read(&priv->regs->attreli);
 113         temp &= ~ATTRELI_EL_MASK;
 114         temp |= ATTRELI_EL(length);
 115         gfar_write(&priv->regs->attreli, temp);
 116
 117         /* Turn stashing on/off as appropriate */
 118         temp = gfar_read(&priv->regs->attr);
 119
 120         if (length)
 121                 temp |= ATTR_BUFSTASH;
 122         else
 123                 temp &= ~(ATTR_BUFSTASH);
 124
 125         gfar_write(&priv->regs->attr, temp);
 126
 127 out:
 128         spin_unlock_irqrestore(&priv->rxlock, flags);
 129
 130         return count;
 131 }
 132
 133 DEVICE_ATTR(rx_stash_size, 0644, gfar_show_rx_stash_size,
 134             gfar_set_rx_stash_size);
 135
 136 /* Stashing will only be enabled when rx_stash_size != 0 */
 137 static ssize_t gfar_show_rx_stash_index(struct device *dev,
 138                                         struct device_attribute *attr,
 139                                         char *buf)
 140 {
 141         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 142
 143         return sprintf(buf, "%d\n", priv->rx_stash_index);
 144 }
 145
 146 static ssize_t gfar_set_rx_stash_index(struct device *dev,
 147                                        struct device_attribute *attr,
 148                                        const char *buf, size_t count)
 149 {
 150         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 151         unsigned short index = simple_strtoul(buf, NULL, 0);
 152         u32 temp;
 153         unsigned long flags;
 154
 155         spin_lock_irqsave(&priv->rxlock, flags);
 156         if (index > priv->rx_stash_size)
 157                 goto out;
 158
 159         if (index == priv->rx_stash_index)
 160                 goto out;
 161
 162         priv->rx_stash_index = index;
 163
 164         temp = gfar_read(&priv->regs->attreli);
 165         temp &= ~ATTRELI_EI_MASK;
 166         temp |= ATTRELI_EI(index);
 167         gfar_write(&priv->regs->attreli, flags);
 168
 169 out:
 170         spin_unlock_irqrestore(&priv->rxlock, flags);
 171
 172         return count;
 173 }
 174
 175 DEVICE_ATTR(rx_stash_index, 0644, gfar_show_rx_stash_index,
 176             gfar_set_rx_stash_index);
 177
 178 static ssize_t gfar_show_fifo_threshold(struct device *dev,
 179                                         struct device_attribute *attr,
 180                                         char *buf)
 181 {
 182         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 183
 184         return sprintf(buf, "%d\n", priv->fifo_threshold);
 185 }
 186
 187 static ssize_t gfar_set_fifo_threshold(struct device *dev,
 188                                        struct device_attribute *attr,
 189                                        const char *buf, size_t count)
 190 {
 191         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 192         unsigned int length = simple_strtoul(buf, NULL, 0);
 193         u32 temp;
 194         unsigned long flags;
 195
 196         if (length > GFAR_MAX_FIFO_THRESHOLD)
 197                 return count;
 198
 199         spin_lock_irqsave(&priv->txlock, flags);
 200
 201         priv->fifo_threshold = length;
 202
 203         temp = gfar_read(&priv->regs->fifo_tx_thr);
 204         temp &= ~FIFO_TX_THR_MASK;
 205         temp |= length;
 206         gfar_write(&priv->regs->fifo_tx_thr, temp);
 207
 208         spin_unlock_irqrestore(&priv->txlock, flags);
 209
 210         return count;
 211 }
 212
 213 DEVICE_ATTR(fifo_threshold, 0644, gfar_show_fifo_threshold,
 214             gfar_set_fifo_threshold);
 215
 216 static ssize_t gfar_show_fifo_starve(struct device *dev,
 217                                      struct device_attribute *attr, char *buf)
 218 {
 219         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 220
 221         return sprintf(buf, "%d\n", priv->fifo_starve);
 222 }
 223
 224 static ssize_t gfar_set_fifo_starve(struct device *dev,
 225                                     struct device_attribute *attr,
 226                                     const char *buf, size_t count)
 227 {
 228         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 229         unsigned int num = simple_strtoul(buf, NULL, 0);
 230         u32 temp;
 231         unsigned long flags;
 232
 233         if (num > GFAR_MAX_FIFO_STARVE)
 234                 return count;
 235
 236         spin_lock_irqsave(&priv->txlock, flags);
 237
 238         priv->fifo_starve = num;
 239
 240         temp = gfar_read(&priv->regs->fifo_tx_starve);
 241         temp &= ~FIFO_TX_STARVE_MASK;
 242         temp |= num;
 243         gfar_write(&priv->regs->fifo_tx_starve, temp);
 244
 245         spin_unlock_irqrestore(&priv->txlock, flags);
 246
 247         return count;
 248 }
 249
 250 DEVICE_ATTR(fifo_starve, 0644, gfar_show_fifo_starve, gfar_set_fifo_starve);
 251
 252 static ssize_t gfar_show_fifo_starve_off(struct device *dev,
 253                                          struct device_attribute *attr,
 254                                          char *buf)
 255 {
 256         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 257
 258         return sprintf(buf, "%d\n", priv->fifo_starve_off);
 259 }
 260
 261 static ssize_t gfar_set_fifo_starve_off(struct device *dev,
 262                                         struct device_attribute *attr,
 263                                         const char *buf, size_t count)
 264 {
 265         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 266         unsigned int num = simple_strtoul(buf, NULL, 0);
 267         u32 temp;
 268         unsigned long flags;
 269
 270         if (num > GFAR_MAX_FIFO_STARVE_OFF)
 271                 return count;
 272
 273         spin_lock_irqsave(&priv->txlock, flags);
 274
 275         priv->fifo_starve_off = num;
 276
 277         temp = gfar_read(&priv->regs->fifo_tx_starve_shutoff);
 278         temp &= ~FIFO_TX_STARVE_OFF_MASK;
 279         temp |= num;
 280         gfar_write(&priv->regs->fifo_tx_starve_shutoff, temp);
 281
 282         spin_unlock_irqrestore(&priv->txlock, flags);
 283
 284         return count;
 285 }
 286
 287 DEVICE_ATTR(fifo_starve_off, 0644, gfar_show_fifo_starve_off,
 288             gfar_set_fifo_starve_off);
 289
 290 void gfar_init_sysfs(struct net_device *dev)
 291 {
 292         struct gfar_private *priv = netdev_priv(dev);
 293         int rc;
 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         rc = device_create_file(&dev->dev, &dev_attr_bd_stash);
 305         rc |= device_create_file(&dev->dev, &dev_attr_rx_stash_size);
 306         rc |= device_create_file(&dev->dev, &dev_attr_rx_stash_index);
 307         rc |= device_create_file(&dev->dev, &dev_attr_fifo_threshold);
 308         rc |= device_create_file(&dev->dev, &dev_attr_fifo_starve);
 309         rc |= device_create_file(&dev->dev, &dev_attr_fifo_starve_off);
 310         if (rc)
 311                 dev_err(&dev->dev, "Error creating gianfar sysfs files.\n");
 312 }