drivers/net/ethernet/freescale/gianfar_sysfs.c

   1 /*
   2  * drivers/net/ethernet/freescale/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  * Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com>
  12  *
  13  * Copyright 2002-2009 Freescale Semiconductor, Inc.
  14  *
  15  * This program is free software; you can redistribute  it and/or modify it
  16  * under  the terms of  the GNU General  Public License as published by the
  17  * Free Software Foundation;  either version 2 of the  License, or (at your
  18  * option) any later version.
  19  *
  20  * Sysfs file creation and management
  21  */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/string.h>
  25 #include <linux/errno.h>
  26 #include <linux/unistd.h>
  27 #include <linux/delay.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/mm.h>
  31 #include <linux/device.h>
  32
  33 #include <asm/uaccess.h>
  34 #include <linux/module.h>
  35
  36 #include "gianfar.h"
  37
  38 static ssize_t gfar_show_bd_stash(struct device *dev,
  39                                   struct device_attribute *attr, char *buf)
  40 {
  41         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
  42
  43         return sprintf(buf, "%s\n", priv->bd_stash_en ? "on" : "off");
  44 }
  45
  46 static ssize_t gfar_set_bd_stash(struct device *dev,
  47                                  struct device_attribute *attr,
  48                                  const char *buf, size_t count)
  49 {
  50         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
  51         struct gfar __iomem *regs = priv->gfargrp[0].regs;
  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
  60         /* Find out the new setting */
  61         if (!strncmp("on", buf, count - 1) || !strncmp("1", buf, count - 1))
  62                 new_setting = 1;
  63         else if (!strncmp("off", buf, count - 1) ||
  64                  !strncmp("0", buf, count - 1))
  65                 new_setting = 0;
  66         else
  67                 return count;
  68
  69
  70         local_irq_save(flags);
  71         lock_rx_qs(priv);
  72
  73         /* Set the new stashing value */
  74         priv->bd_stash_en = new_setting;
  75
  76         temp = gfar_read(&regs->attr);
  77
  78         if (new_setting)
  79                 temp |= ATTR_BDSTASH;
  80         else
  81                 temp &= ~(ATTR_BDSTASH);
  82
  83         gfar_write(&regs->attr, temp);
  84
  85         unlock_rx_qs(priv);
  86         local_irq_restore(flags);
  87
  88         return count;
  89 }
  90
  91 static DEVICE_ATTR(bd_stash, 0644, gfar_show_bd_stash, gfar_set_bd_stash);
  92
  93 static ssize_t gfar_show_rx_stash_size(struct device *dev,
  94                                        struct device_attribute *attr, char *buf)
  95 {
  96         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
  97
  98         return sprintf(buf, "%d\n", priv->rx_stash_size);
  99 }
 100
 101 static ssize_t gfar_set_rx_stash_size(struct device *dev,
 102                                       struct device_attribute *attr,
 103                                       const char *buf, size_t count)
 104 {
 105         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 106         struct gfar __iomem *regs = priv->gfargrp[0].regs;
 107         unsigned int length = simple_strtoul(buf, NULL, 0);
 108         u32 temp;
 109         unsigned long flags;
 110
 111         if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BUF_STASHING))
 112                 return count;
 113
 114         local_irq_save(flags);
 115         lock_rx_qs(priv);
 116
 117         if (length > priv->rx_buffer_size)
 118                 goto out;
 119
 120         if (length == priv->rx_stash_size)
 121                 goto out;
 122
 123         priv->rx_stash_size = length;
 124
 125         temp = gfar_read(&regs->attreli);
 126         temp &= ~ATTRELI_EL_MASK;
 127         temp |= ATTRELI_EL(length);
 128         gfar_write(&regs->attreli, temp);
 129
 130         /* Turn stashing on/off as appropriate */
 131         temp = gfar_read(&regs->attr);
 132
 133         if (length)
 134                 temp |= ATTR_BUFSTASH;
 135         else
 136                 temp &= ~(ATTR_BUFSTASH);
 137
 138         gfar_write(&regs->attr, temp);
 139
 140 out:
 141         unlock_rx_qs(priv);
 142         local_irq_restore(flags);
 143
 144         return count;
 145 }
 146
 147 static DEVICE_ATTR(rx_stash_size, 0644, gfar_show_rx_stash_size,
 148                    gfar_set_rx_stash_size);
 149
 150 /* Stashing will only be enabled when rx_stash_size != 0 */
 151 static ssize_t gfar_show_rx_stash_index(struct device *dev,
 152                                         struct device_attribute *attr,
 153                                         char *buf)
 154 {
 155         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 156
 157         return sprintf(buf, "%d\n", priv->rx_stash_index);
 158 }
 159
 160 static ssize_t gfar_set_rx_stash_index(struct device *dev,
 161                                        struct device_attribute *attr,
 162                                        const char *buf, size_t count)
 163 {
 164         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 165         struct gfar __iomem *regs = priv->gfargrp[0].regs;
 166         unsigned short index = simple_strtoul(buf, NULL, 0);
 167         u32 temp;
 168         unsigned long flags;
 169
 170         if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BUF_STASHING))
 171                 return count;
 172
 173         local_irq_save(flags);
 174         lock_rx_qs(priv);
 175
 176         if (index > priv->rx_stash_size)
 177                 goto out;
 178
 179         if (index == priv->rx_stash_index)
 180                 goto out;
 181
 182         priv->rx_stash_index = index;
 183
 184         temp = gfar_read(&regs->attreli);
 185         temp &= ~ATTRELI_EI_MASK;
 186         temp |= ATTRELI_EI(index);
 187         gfar_write(&regs->attreli, temp);
 188
 189 out:
 190         unlock_rx_qs(priv);
 191         local_irq_restore(flags);
 192
 193         return count;
 194 }
 195
 196 static DEVICE_ATTR(rx_stash_index, 0644, gfar_show_rx_stash_index,
 197                    gfar_set_rx_stash_index);
 198
 199 static ssize_t gfar_show_fifo_threshold(struct device *dev,
 200                                         struct device_attribute *attr,
 201                                         char *buf)
 202 {
 203         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 204
 205         return sprintf(buf, "%d\n", priv->fifo_threshold);
 206 }
 207
 208 static ssize_t gfar_set_fifo_threshold(struct device *dev,
 209                                        struct device_attribute *attr,
 210                                        const char *buf, size_t count)
 211 {
 212         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 213         struct gfar __iomem *regs = priv->gfargrp[0].regs;
 214         unsigned int length = simple_strtoul(buf, NULL, 0);
 215         u32 temp;
 216         unsigned long flags;
 217
 218         if (length > GFAR_MAX_FIFO_THRESHOLD)
 219                 return count;
 220
 221         local_irq_save(flags);
 222         lock_tx_qs(priv);
 223
 224         priv->fifo_threshold = length;
 225
 226         temp = gfar_read(&regs->fifo_tx_thr);
 227         temp &= ~FIFO_TX_THR_MASK;
 228         temp |= length;
 229         gfar_write(&regs->fifo_tx_thr, temp);
 230
 231         unlock_tx_qs(priv);
 232         local_irq_restore(flags);
 233
 234         return count;
 235 }
 236
 237 static DEVICE_ATTR(fifo_threshold, 0644, gfar_show_fifo_threshold,
 238                    gfar_set_fifo_threshold);
 239
 240 static ssize_t gfar_show_fifo_starve(struct device *dev,
 241                                      struct device_attribute *attr, char *buf)
 242 {
 243         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 244
 245         return sprintf(buf, "%d\n", priv->fifo_starve);
 246 }
 247
 248 static ssize_t gfar_set_fifo_starve(struct device *dev,
 249                                     struct device_attribute *attr,
 250                                     const char *buf, size_t count)
 251 {
 252         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 253         struct gfar __iomem *regs = priv->gfargrp[0].regs;
 254         unsigned int num = simple_strtoul(buf, NULL, 0);
 255         u32 temp;
 256         unsigned long flags;
 257
 258         if (num > GFAR_MAX_FIFO_STARVE)
 259                 return count;
 260
 261         local_irq_save(flags);
 262         lock_tx_qs(priv);
 263
 264         priv->fifo_starve = num;
 265
 266         temp = gfar_read(&regs->fifo_tx_starve);
 267         temp &= ~FIFO_TX_STARVE_MASK;
 268         temp |= num;
 269         gfar_write(&regs->fifo_tx_starve, temp);
 270
 271         unlock_tx_qs(priv);
 272         local_irq_restore(flags);
 273
 274         return count;
 275 }
 276
 277 static DEVICE_ATTR(fifo_starve, 0644, gfar_show_fifo_starve,
 278                    gfar_set_fifo_starve);
 279
 280 static ssize_t gfar_show_fifo_starve_off(struct device *dev,
 281                                          struct device_attribute *attr,
 282                                          char *buf)
 283 {
 284         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 285
 286         return sprintf(buf, "%d\n", priv->fifo_starve_off);
 287 }
 288
 289 static ssize_t gfar_set_fifo_starve_off(struct device *dev,
 290                                         struct device_attribute *attr,
 291                                         const char *buf, size_t count)
 292 {
 293         struct gfar_private *priv = netdev_priv(to_net_dev(dev));
 294         struct gfar __iomem *regs = priv->gfargrp[0].regs;
 295         unsigned int num = simple_strtoul(buf, NULL, 0);
 296         u32 temp;
 297         unsigned long flags;
 298
 299         if (num > GFAR_MAX_FIFO_STARVE_OFF)
 300                 return count;
 301
 302         local_irq_save(flags);
 303         lock_tx_qs(priv);
 304
 305         priv->fifo_starve_off = num;
 306
 307         temp = gfar_read(&regs->fifo_tx_starve_shutoff);
 308         temp &= ~FIFO_TX_STARVE_OFF_MASK;
 309         temp |= num;
 310         gfar_write(&regs->fifo_tx_starve_shutoff, temp);
 311
 312         unlock_tx_qs(priv);
 313         local_irq_restore(flags);
 314
 315         return count;
 316 }
 317
 318 static DEVICE_ATTR(fifo_starve_off, 0644, gfar_show_fifo_starve_off,
 319                    gfar_set_fifo_starve_off);
 320
 321 void gfar_init_sysfs(struct net_device *dev)
 322 {
 323         struct gfar_private *priv = netdev_priv(dev);
 324         int rc;
 325
 326         /* Initialize the default values */
 327         priv->fifo_threshold = DEFAULT_FIFO_TX_THR;
 328         priv->fifo_starve = DEFAULT_FIFO_TX_STARVE;
 329         priv->fifo_starve_off = DEFAULT_FIFO_TX_STARVE_OFF;
 330
 331         /* Create our sysfs files */
 332         rc = device_create_file(&dev->dev, &dev_attr_bd_stash);
 333         rc |= device_create_file(&dev->dev, &dev_attr_rx_stash_size);
 334         rc |= device_create_file(&dev->dev, &dev_attr_rx_stash_index);
 335         rc |= device_create_file(&dev->dev, &dev_attr_fifo_threshold);
 336         rc |= device_create_file(&dev->dev, &dev_attr_fifo_starve);
 337         rc |= device_create_file(&dev->dev, &dev_attr_fifo_starve_off);
 338         if (rc)
 339                 dev_err(&dev->dev, "Error creating gianfar sysfs files\n");
 340 }