[PATCH] Gianfar update and sysfs support

This seems to have gotten lost, so I'll resend.

Signed-off-by: Andy Fleming <afleming@freescale.com>

* Added sysfs support to gianfar for modifying FIFO and stashing parameters
* Updated driver to support 10 Mbit, full duplex operation
* Improved comments throughout
* Cleaned up and optimized offloading code
* Fixed a bug where rx buffers were being improperly mapped and unmapped
* (only manifested if cache-coherency was off)
* Added support for using the eTSEC exact-match MAC registers
* Bumped the version to 1.3
* Added support for distinguishing between reduced 100 and 10 Mbit modes
* Modified default coalescing values to lower latency
* Added documentation
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 311 insertions, 0 deletions

diff --git a/drivers/net/gianfar_sysfs.c b/drivers/net/gianfar_sysfs.c
new file mode 100644
index 0000000..10d34cb
--- /dev/null
+++ b/drivers/net/gianfar_sysfs.c
@@ -0,0 +1,311 @@
+/*
+ * 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 (kumar.gala@freescale.com)
+ *
+ * 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/config.h>
+#include <linux/kernel.h>
+#include <linux/sched.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 <linux/version.h>
+
+#include "gianfar.h"
+
+#define GFAR_ATTR(_name) \
+static ssize_t gfar_show_##_name(struct class_device *cdev, char *buf); \
+static ssize_t gfar_set_##_name(struct class_device *cdev, \
+		const char *buf, size_t count); \
+static CLASS_DEVICE_ATTR(_name, 0644, gfar_show_##_name, gfar_set_##_name)
+
+#define GFAR_CREATE_FILE(_dev, _name) \
+	class_device_create_file(&_dev->class_dev, &class_device_attr_##_name)
+
+GFAR_ATTR(bd_stash);
+GFAR_ATTR(rx_stash_size);
+GFAR_ATTR(rx_stash_index);
+GFAR_ATTR(fifo_threshold);
+GFAR_ATTR(fifo_starve);
+GFAR_ATTR(fifo_starve_off);
+
+#define to_net_dev(cd) container_of(cd, struct net_device, class_dev)
+
+static ssize_t gfar_show_bd_stash(struct class_device *cdev, char *buf)
+{
+	struct net_device *dev = to_net_dev(cdev);
+	struct gfar_private *priv = netdev_priv(dev);
+
+	return sprintf(buf, "%s\n", priv->bd_stash_en? "on" : "off");
+}
+
+static ssize_t gfar_set_bd_stash(struct class_device *cdev,
+		const char *buf, size_t count)
+{
+	struct net_device *dev = to_net_dev(cdev);
+	struct gfar_private *priv = netdev_priv(dev);
+	int new_setting = 0;
+	u32 temp;
+	unsigned long flags;
+
+	/* 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->lock, 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->lock, flags);
+
+	return count;
+}
+
+static ssize_t gfar_show_rx_stash_size(struct class_device *cdev, char *buf)
+{
+	struct net_device *dev = to_net_dev(cdev);
+	struct gfar_private *priv = netdev_priv(dev);
+
+	return sprintf(buf, "%d\n", priv->rx_stash_size);
+}
+
+static ssize_t gfar_set_rx_stash_size(struct class_device *cdev,
+		const char *buf, size_t count)
+{
+	struct net_device *dev = to_net_dev(cdev);
+	struct gfar_private *priv = netdev_priv(dev);
+	unsigned int length = simple_strtoul(buf, NULL, 0);
+	u32 temp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->lock, flags);
+	if (length > priv->rx_buffer_size)
+		return count;
+
+	if (length == priv->rx_stash_size)
+		return count;
+
+	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);
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	return count;
+}
+
+
+/* Stashing will only be enabled when rx_stash_size != 0 */
+static ssize_t gfar_show_rx_stash_index(struct class_device *cdev, char *buf)
+{
+	struct net_device *dev = to_net_dev(cdev);
+	struct gfar_private *priv = netdev_priv(dev);
+
+	return sprintf(buf, "%d\n", priv->rx_stash_index);
+}
+
+static ssize_t gfar_set_rx_stash_index(struct class_device *cdev,
+		const char *buf, size_t count)
+{
+	struct net_device *dev = to_net_dev(cdev);
+	struct gfar_private *priv = netdev_priv(dev);
+	unsigned short index = simple_strtoul(buf, NULL, 0);
+	u32 temp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->lock, flags);
+	if (index > priv->rx_stash_size)
+		return count;
+
+	if (index == priv->rx_stash_index)
+		return count;
+
+	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);
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	return count;
+}
+
+static ssize_t gfar_show_fifo_threshold(struct class_device *cdev, char *buf)
+{
+	struct net_device *dev = to_net_dev(cdev);
+	struct gfar_private *priv = netdev_priv(dev);
+
+	return sprintf(buf, "%d\n", priv->fifo_threshold);
+}
+
+static ssize_t gfar_set_fifo_threshold(struct class_device *cdev,
+		const char *buf, size_t count)
+{
+	struct net_device *dev = to_net_dev(cdev);
+	struct gfar_private *priv = netdev_priv(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->lock, 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->lock, flags);
+
+	return count;
+}
+
+static ssize_t gfar_show_fifo_starve(struct class_device *cdev, char *buf)
+{
+	struct net_device *dev = to_net_dev(cdev);
+	struct gfar_private *priv = netdev_priv(dev);
+
+	return sprintf(buf, "%d\n", priv->fifo_starve);
+}
+
+
+static ssize_t gfar_set_fifo_starve(struct class_device *cdev,
+		const char *buf, size_t count)
+{
+	struct net_device *dev = to_net_dev(cdev);
+	struct gfar_private *priv = netdev_priv(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->lock, 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->lock, flags);
+
+	return count;
+}
+
+static ssize_t gfar_show_fifo_starve_off(struct class_device *cdev, char *buf)
+{
+	struct net_device *dev = to_net_dev(cdev);
+	struct gfar_private *priv = netdev_priv(dev);
+
+	return sprintf(buf, "%d\n", priv->fifo_starve_off);
+}
+
+static ssize_t gfar_set_fifo_starve_off(struct class_device *cdev,
+		const char *buf, size_t count)
+{
+	struct net_device *dev = to_net_dev(cdev);
+	struct gfar_private *priv = netdev_priv(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->lock, 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->lock, flags);
+
+	return count;
+}
+
+void gfar_init_sysfs(struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+
+	/* Initialize the default values */
+	priv->rx_stash_size = DEFAULT_STASH_LENGTH;
+	priv->rx_stash_index = DEFAULT_STASH_INDEX;
+	priv->fifo_threshold = DEFAULT_FIFO_TX_THR;
+	priv->fifo_starve = DEFAULT_FIFO_TX_STARVE;
+	priv->fifo_starve_off = DEFAULT_FIFO_TX_STARVE_OFF;
+	priv->bd_stash_en = DEFAULT_BD_STASH;
+
+	/* Create our sysfs files */
+	GFAR_CREATE_FILE(dev, bd_stash);
+	GFAR_CREATE_FILE(dev, rx_stash_size);
+	GFAR_CREATE_FILE(dev, rx_stash_index);
+	GFAR_CREATE_FILE(dev, fifo_threshold);
+	GFAR_CREATE_FILE(dev, fifo_starve);
+	GFAR_CREATE_FILE(dev, fifo_starve_off);
+
+}