arch/arm/plat-feroceon/mv_drivers_lsp/mv_neta/hwf/hwf_sysfs.c

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********************************************************************************
Marvell GPL License Option

If you received this File from Marvell, you may opt to use, redistribute and/or
modify this File in accordance with the terms and conditions of the General
Public License Version 2, June 1991 (the "GPL License"), a copy of which is
available along with the File in the license.txt file or by writing to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 or
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THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY
DISCLAIMED.  The GPL License provides additional details about this warranty
disclaimer.
*******************************************************************************/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/capability.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>

#include "gbe/mvNeta.h"
#include "net_dev/mv_netdev.h"

static ssize_t hwf_help(char *buf)
{
	int off = 0;

	off += mvOsSPrintf(buf+off, "cat                      help    - print this help\n");
#ifndef CONFIG_MV_ETH_BM_CPU
	off += mvOsSPrintf(buf+off, "cat                      bm    - print HWF BM information\n");
#endif
	off += mvOsSPrintf(buf+off, "echo rxp p txp         > regs  - print HWF registers of port <p>\n");
	off += mvOsSPrintf(buf+off, "echo rxp p txp         > cntrs - print HWF counters of port <p>\n");
	off += mvOsSPrintf(buf+off, "echo rxp p txp txq en  > en    - enable HWF from <rxp> to specific <txq>\n");
	off += mvOsSPrintf(buf+off, "echo rxp p txp txq a b > drop  - set HWF drop threshold <a> and Random bits <b>\n");

	return off;
}

static ssize_t hwf_show(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	const char   *name = attr->attr.name;

	if (!capable(CAP_NET_ADMIN))
		return -EPERM;

	if (!strcmp(name, "help"))
		return hwf_help(buf);
#ifndef CONFIG_MV_ETH_BM_CPU
	else if (!strcmp(name, "bm"))
		mv_hwf_bm_dump();
#endif /* CONFIG_MV_ETH_BM_CPU */

	return 0;
}
static ssize_t hwf_store(struct device *dev,
				   struct device_attribute *attr, const char *buf, size_t len)
{
	const char    *name = attr->attr.name;
	unsigned int  err = 0, rxp = 0, p = 0, txp = 0, txq = 0, a = 0, b = 0;
	unsigned long flags;

	if (!capable(CAP_NET_ADMIN))
		return -EPERM;

	sscanf(buf, "%d %d %d %d %d %d", &rxp, &p, &txp, &txq, &a, &b);

	local_irq_save(flags);

	if (!strcmp(name, "regs")) {
		mvNetaHwfRxpRegs(rxp);
		mvNetaHwfTxpRegs(rxp, p, txp);
	} else if (!strcmp(name, "cntrs")) {
		mvNetaHwfTxpCntrs(rxp, p, txp);
	} else if (!strcmp(name, "en")) {
		if (a)        {
			/* Set txp/txq ownership to HWF */
			if (mv_eth_ctrl_txq_hwf_own(p, txp, txq, rxp)) {
				printk(KERN_ERR "%s failed: p=%d, txp=%d, txq=%d\n",
					__func__, p, txp, txq);
				return -EINVAL;
			}
		} else
			mv_eth_ctrl_txq_hwf_own(p, txp, txq, -1);

		mvNetaHwfTxqEnable(rxp, p, txp, txq, a);
	} else if (!strcmp(name, "drop")) {
		mvNetaHwfTxqDropSet(rxp, p, txp, txq, a, b);
	} else
		printk(KERN_ERR "%s: illegal operation <%s>\n", __func__, attr->attr.name);

	local_irq_restore(flags);

	if (err)
		printk(KERN_ERR "%s: <%s>, error %d\n", __func__, attr->attr.name, err);

	return err ? -EINVAL : len;
}

static DEVICE_ATTR(regs,  S_IWUSR, hwf_show, hwf_store);
static DEVICE_ATTR(cntrs, S_IWUSR, hwf_show, hwf_store);
static DEVICE_ATTR(en,    S_IWUSR, hwf_show, hwf_store);
static DEVICE_ATTR(drop,  S_IWUSR, hwf_show, hwf_store);
static DEVICE_ATTR(bm,    S_IRUSR, hwf_show, hwf_store);
static DEVICE_ATTR(help,  S_IRUSR, hwf_show, hwf_store);

static struct attribute *hwf_attrs[] = {
	&dev_attr_regs.attr,
	&dev_attr_cntrs.attr,
	&dev_attr_en.attr,
	&dev_attr_drop.attr,
	&dev_attr_bm.attr,
	&dev_attr_help.attr,
	NULL
};

static struct attribute_group hwf_group = {
	.name = "hwf",
	.attrs = hwf_attrs,
};

int __devinit hwf_sysfs_init(void)
{
		int err;
		struct device *pd;

		pd = bus_find_device_by_name(&platform_bus_type, NULL, "neta");
		if (!pd) {
			platform_device_register_simple("neta", -1, NULL, 0);
			pd = bus_find_device_by_name(&platform_bus_type, NULL, "neta");
		}

		if (!pd) {
			printk(KERN_ERR "%s: cannot find neta device\n", __func__);
			pd = &platform_bus;
		}

		err = sysfs_create_group(&pd->kobj, &hwf_group);
		if (err) {
			printk(KERN_INFO "sysfs group failed %d\n", err);
			goto out;
		}
out:
		return err;
}

module_init(hwf_sysfs_init);

MODULE_AUTHOR("Dmitri Epshtein");
MODULE_DESCRIPTION("HWF for Marvell NetA MV65xxx");
MODULE_LICENSE("GPL");