/*
 * 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)
 * Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com>
 *
 * Copyright 2002-2009 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/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\n", 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));
        struct gfar __iomem *regs = priv->gfargrp[0].regs;
        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;


        local_irq_save(flags);
        lock_rx_qs(priv);

        /* Set the new stashing value */
        priv->bd_stash_en = new_setting;

        temp = gfar_read(&regs->attr);

        if (new_setting)
                temp |= ATTR_BDSTASH;
        else
                temp &= ~(ATTR_BDSTASH);

        gfar_write(&regs->attr, temp);

        unlock_rx_qs(priv);
        local_irq_restore(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\n", 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));
        struct gfar __iomem *regs = priv->gfargrp[0].regs;
        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;

        local_irq_save(flags);
        lock_rx_qs(priv);

        if (length > priv->rx_buffer_size)
                goto out;

        if (length == priv->rx_stash_size)
                goto out;

        priv->rx_stash_size = length;

        temp = gfar_read(&regs->attreli);
        temp &= ~ATTRELI_EL_MASK;
        temp |= ATTRELI_EL(length);
        gfar_write(&regs->attreli, temp);

        /* Turn stashing on/off as appropriate */
        temp = gfar_read(&regs->attr);

        if (length)
                temp |= ATTR_BUFSTASH;
        else
                temp &= ~(ATTR_BUFSTASH);

        gfar_write(&regs->attr, temp);

out:
        unlock_rx_qs(priv);
        local_irq_restore(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\n", 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));
        struct gfar __iomem *regs = priv->gfargrp[0].regs;
        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;

        local_irq_save(flags);
        lock_rx_qs(priv);

        if (index > priv->rx_stash_size)
                goto out;

        if (index == priv->rx_stash_index)
                goto out;

        priv->rx_stash_index = index;

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

out:
        unlock_rx_qs(priv);
        local_irq_restore(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\n", 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));
        struct gfar __iomem *regs = priv->gfargrp[0].regs;
        unsigned int length = simple_strtoul(buf, NULL, 0);
        u32 temp;
        unsigned long flags;

        if (length > GFAR_MAX_FIFO_THRESHOLD)
                return count;

        local_irq_save(flags);
        lock_tx_qs(priv);

        priv->fifo_threshold = length;

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

        unlock_tx_qs(priv);
        local_irq_restore(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\n", 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));
        struct gfar __iomem *regs = priv->gfargrp[0].regs;
        unsigned int num = simple_strtoul(buf, NULL, 0);
        u32 temp;
        unsigned long flags;

        if (num > GFAR_MAX_FIFO_STARVE)
                return count;

        local_irq_save(flags);
        lock_tx_qs(priv);

        priv->fifo_starve = num;

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

        unlock_tx_qs(priv);
        local_irq_restore(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\n", 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));
        struct gfar __iomem *regs = priv->gfargrp[0].regs;
        unsigned int num = simple_strtoul(buf, NULL, 0);
        u32 temp;
        unsigned long flags;

        if (num > GFAR_MAX_FIFO_STARVE_OFF)
                return count;

        local_irq_save(flags);
        lock_tx_qs(priv);

        priv->fifo_starve_off = num;

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

        unlock_tx_qs(priv);
        local_irq_restore(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.\n");
}