/*
   * drivers/net/gianfar_sysfs.c
   *
   * Gianfar Ethernet Driver
   * This driver is designed for the non-CPM ethernet controllers
   * on the 85xx and 83xx family of integrated processors
   * Based on 8260_io/fcc_enet.c
   *
   * Author: Andy Fleming

   * Maintainer: Kumar Gala (galak@kernel.crashing.org)

   *
   * Copyright (c) 2002-2005 Freescale Semiconductor, Inc.
   *
   * This program is free software; you can redistribute  it and/or modify it
   * under  the terms of  the GNU General  Public License as published by the
   * Free Software Foundation;  either version 2 of the  License, or (at your
   * option) any later version.
   *
   * Sysfs file creation and management
   */

  #include <linux/kernel.h>

  #include <linux/string.h>
  #include <linux/errno.h>
  #include <linux/unistd.h>
  #include <linux/slab.h>
  #include <linux/init.h>
  #include <linux/delay.h>
  #include <linux/etherdevice.h>
  #include <linux/spinlock.h>
  #include <linux/mm.h>
  #include <linux/device.h>
  
  #include <asm/uaccess.h>
  #include <linux/module.h>

  
  #include "gianfar.h"

  static ssize_t gfar_show_bd_stash(struct device *dev,
  				  struct device_attribute *attr, char *buf)

  {

  	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

  	return sprintf(buf, "%s
  ", priv->bd_stash_en ? "on" : "off");

  }

  static ssize_t gfar_set_bd_stash(struct device *dev,
  				 struct device_attribute *attr,
  				 const char *buf, size_t count)

  {

  	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

  	int new_setting = 0;
  	u32 temp;
  	unsigned long flags;

  	if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BD_STASHING))
  		return count;

  	/* Find out the new setting */

  	if (!strncmp("on", buf, count - 1) || !strncmp("1", buf, count - 1))

  		new_setting = 1;

  	else if (!strncmp("off", buf, count - 1)
  		 || !strncmp("0", buf, count - 1))

  		new_setting = 0;
  	else
  		return count;

  	spin_lock_irqsave(&priv->rxlock, flags);

  
  	/* Set the new stashing value */
  	priv->bd_stash_en = new_setting;
  
  	temp = gfar_read(&priv->regs->attr);

  	if (new_setting)
  		temp |= ATTR_BDSTASH;
  	else
  		temp &= ~(ATTR_BDSTASH);
  
  	gfar_write(&priv->regs->attr, temp);

  	spin_unlock_irqrestore(&priv->rxlock, flags);

  
  	return count;
  }

  static DEVICE_ATTR(bd_stash, 0644, gfar_show_bd_stash, gfar_set_bd_stash);

  static ssize_t gfar_show_rx_stash_size(struct device *dev,
  				       struct device_attribute *attr, char *buf)

  {

  	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

  
  	return sprintf(buf, "%d
  ", priv->rx_stash_size);
  }

  static ssize_t gfar_set_rx_stash_size(struct device *dev,
  				      struct device_attribute *attr,
  				      const char *buf, size_t count)

  {

  	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

  	unsigned int length = simple_strtoul(buf, NULL, 0);
  	u32 temp;
  	unsigned long flags;

  	if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BUF_STASHING))
  		return count;

  	spin_lock_irqsave(&priv->rxlock, flags);

  	if (length > priv->rx_buffer_size)

  		goto out;

  
  	if (length == priv->rx_stash_size)

  		goto out;

  
  	priv->rx_stash_size = length;
  
  	temp = gfar_read(&priv->regs->attreli);
  	temp &= ~ATTRELI_EL_MASK;
  	temp |= ATTRELI_EL(length);
  	gfar_write(&priv->regs->attreli, temp);
  
  	/* Turn stashing on/off as appropriate */
  	temp = gfar_read(&priv->regs->attr);
  
  	if (length)
  		temp |= ATTR_BUFSTASH;
  	else
  		temp &= ~(ATTR_BUFSTASH);
  
  	gfar_write(&priv->regs->attr, temp);

  out:

  	spin_unlock_irqrestore(&priv->rxlock, flags);

  
  	return count;
  }

  static DEVICE_ATTR(rx_stash_size, 0644, gfar_show_rx_stash_size,
  		   gfar_set_rx_stash_size);

  /* Stashing will only be enabled when rx_stash_size != 0 */

  static ssize_t gfar_show_rx_stash_index(struct device *dev,
  					struct device_attribute *attr,
  					char *buf)

  {

  	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

  
  	return sprintf(buf, "%d
  ", priv->rx_stash_index);
  }

  static ssize_t gfar_set_rx_stash_index(struct device *dev,
  				       struct device_attribute *attr,
  				       const char *buf, size_t count)

  {

  	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

  	unsigned short index = simple_strtoul(buf, NULL, 0);
  	u32 temp;
  	unsigned long flags;

  	if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BUF_STASHING))
  		return count;

  	spin_lock_irqsave(&priv->rxlock, flags);

  	if (index > priv->rx_stash_size)

  		goto out;

  
  	if (index == priv->rx_stash_index)

  		goto out;

  
  	priv->rx_stash_index = index;
  
  	temp = gfar_read(&priv->regs->attreli);
  	temp &= ~ATTRELI_EI_MASK;
  	temp |= ATTRELI_EI(index);
  	gfar_write(&priv->regs->attreli, flags);

  out:

  	spin_unlock_irqrestore(&priv->rxlock, flags);

  
  	return count;
  }

  static DEVICE_ATTR(rx_stash_index, 0644, gfar_show_rx_stash_index,
  		   gfar_set_rx_stash_index);

  static ssize_t gfar_show_fifo_threshold(struct device *dev,
  					struct device_attribute *attr,
  					char *buf)

  {

  	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

  
  	return sprintf(buf, "%d
  ", priv->fifo_threshold);
  }

  static ssize_t gfar_set_fifo_threshold(struct device *dev,
  				       struct device_attribute *attr,
  				       const char *buf, size_t count)

  {

  	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

  	unsigned int length = simple_strtoul(buf, NULL, 0);
  	u32 temp;
  	unsigned long flags;
  
  	if (length > GFAR_MAX_FIFO_THRESHOLD)
  		return count;

  	spin_lock_irqsave(&priv->txlock, flags);

  
  	priv->fifo_threshold = length;
  
  	temp = gfar_read(&priv->regs->fifo_tx_thr);
  	temp &= ~FIFO_TX_THR_MASK;
  	temp |= length;
  	gfar_write(&priv->regs->fifo_tx_thr, temp);

  	spin_unlock_irqrestore(&priv->txlock, flags);

  
  	return count;
  }

  static DEVICE_ATTR(fifo_threshold, 0644, gfar_show_fifo_threshold,
  		   gfar_set_fifo_threshold);

  static ssize_t gfar_show_fifo_starve(struct device *dev,
  				     struct device_attribute *attr, char *buf)

  {

  	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

  
  	return sprintf(buf, "%d
  ", priv->fifo_starve);
  }

  static ssize_t gfar_set_fifo_starve(struct device *dev,
  				    struct device_attribute *attr,
  				    const char *buf, size_t count)

  {

  	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

  	unsigned int num = simple_strtoul(buf, NULL, 0);
  	u32 temp;
  	unsigned long flags;
  
  	if (num > GFAR_MAX_FIFO_STARVE)
  		return count;

  	spin_lock_irqsave(&priv->txlock, flags);

  
  	priv->fifo_starve = num;
  
  	temp = gfar_read(&priv->regs->fifo_tx_starve);
  	temp &= ~FIFO_TX_STARVE_MASK;
  	temp |= num;
  	gfar_write(&priv->regs->fifo_tx_starve, temp);

  	spin_unlock_irqrestore(&priv->txlock, flags);

  
  	return count;
  }

  static DEVICE_ATTR(fifo_starve, 0644, gfar_show_fifo_starve,
  		   gfar_set_fifo_starve);

  static ssize_t gfar_show_fifo_starve_off(struct device *dev,
  					 struct device_attribute *attr,
  					 char *buf)

  {

  	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

  
  	return sprintf(buf, "%d
  ", priv->fifo_starve_off);
  }

  static ssize_t gfar_set_fifo_starve_off(struct device *dev,
  					struct device_attribute *attr,
  					const char *buf, size_t count)

  {

  	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

  	unsigned int num = simple_strtoul(buf, NULL, 0);
  	u32 temp;
  	unsigned long flags;
  
  	if (num > GFAR_MAX_FIFO_STARVE_OFF)
  		return count;

  	spin_lock_irqsave(&priv->txlock, flags);

  
  	priv->fifo_starve_off = num;
  
  	temp = gfar_read(&priv->regs->fifo_tx_starve_shutoff);
  	temp &= ~FIFO_TX_STARVE_OFF_MASK;
  	temp |= num;
  	gfar_write(&priv->regs->fifo_tx_starve_shutoff, temp);

  	spin_unlock_irqrestore(&priv->txlock, flags);

  
  	return count;
  }

  static DEVICE_ATTR(fifo_starve_off, 0644, gfar_show_fifo_starve_off,
  		   gfar_set_fifo_starve_off);

  void gfar_init_sysfs(struct net_device *dev)
  {
  	struct gfar_private *priv = netdev_priv(dev);

  	int rc;

  
  	/* Initialize the default values */

  	priv->fifo_threshold = DEFAULT_FIFO_TX_THR;
  	priv->fifo_starve = DEFAULT_FIFO_TX_STARVE;
  	priv->fifo_starve_off = DEFAULT_FIFO_TX_STARVE_OFF;

  
  	/* Create our sysfs files */

  	rc = device_create_file(&dev->dev, &dev_attr_bd_stash);
  	rc |= device_create_file(&dev->dev, &dev_attr_rx_stash_size);
  	rc |= device_create_file(&dev->dev, &dev_attr_rx_stash_index);
  	rc |= device_create_file(&dev->dev, &dev_attr_fifo_threshold);
  	rc |= device_create_file(&dev->dev, &dev_attr_fifo_starve);
  	rc |= device_create_file(&dev->dev, &dev_attr_fifo_starve_off);
  	if (rc)
  		dev_err(&dev->dev, "Error creating gianfar sysfs files.
  ");

  }