/*
 *   Copyright (c) 2011, 2012, Qualcomm Atheros Communications Inc.
 *   Copyright (c) 2014, I2SE GmbH
 *
 *   Permission to use, copy, modify, and/or distribute this software
 *   for any purpose with or without fee is hereby granted, provided
 *   that the above copyright notice and this permission notice appear
 *   in all copies.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
 *   WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
 *   WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
 *   THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
 *   CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 *   LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 *   NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 *   CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*   This file contains debugging routines for use in the QCA7K driver.
 */

#include <linux/debugfs.h>
#include <linux/ethtool.h>
#include <linux/seq_file.h>
#include <linux/types.h>

#include "qca_7k.h"
#include "qca_debug.h"

#define QCASPI_MAX_REGS 0x20

static const u16 qcaspi_spi_regs[] = {
	SPI_REG_BFR_SIZE,
	SPI_REG_WRBUF_SPC_AVA,
	SPI_REG_RDBUF_BYTE_AVA,
	SPI_REG_SPI_CONFIG,
	SPI_REG_SPI_STATUS,
	SPI_REG_INTR_CAUSE,
	SPI_REG_INTR_ENABLE,
	SPI_REG_RDBUF_WATERMARK,
	SPI_REG_WRBUF_WATERMARK,
	SPI_REG_SIGNATURE,
	SPI_REG_ACTION_CTRL
};

/* The order of these strings must match the order of the fields in
 * struct qcaspi_stats
 * See qca_spi.h
 */
static const char qcaspi_gstrings_stats[][ETH_GSTRING_LEN] = {
	"Triggered resets",
	"Device resets",
	"Reset timeouts",
	"Read errors",
	"Write errors",
	"Read buffer errors",
	"Write buffer errors",
	"Out of memory",
	"Write buffer misses",
	"Transmit ring full",
	"SPI errors",
};

#ifdef CONFIG_DEBUG_FS

static int
qcaspi_info_show(struct seq_file *s, void *what)
{
	struct qcaspi *qca = s->private;

	seq_printf(s, "RX buffer size   : %lu\n",
		   (unsigned long)qca->buffer_size);

	seq_puts(s, "TX ring state    : ");

	if (qca->txr.skb[qca->txr.head] == NULL)
		seq_puts(s, "empty");
	else if (qca->txr.skb[qca->txr.tail])
		seq_puts(s, "full");
	else
		seq_puts(s, "in use");

	seq_puts(s, "\n");

	seq_printf(s, "TX ring size     : %u\n",
		   qca->txr.size);

	seq_printf(s, "Sync state       : %u (",
		   (unsigned int)qca->sync);
	switch (qca->sync) {
	case QCASPI_SYNC_UNKNOWN:
		seq_puts(s, "QCASPI_SYNC_UNKNOWN");
		break;
	case QCASPI_SYNC_RESET:
		seq_puts(s, "QCASPI_SYNC_RESET");
		break;
	case QCASPI_SYNC_READY:
		seq_puts(s, "QCASPI_SYNC_READY");
		break;
	default:
		seq_puts(s, "INVALID");
		break;
	}
	seq_puts(s, ")\n");

	seq_printf(s, "IRQ              : %d\n",
		   qca->spi_dev->irq);
	seq_printf(s, "INTR REQ         : %u\n",
		   qca->intr_req);
	seq_printf(s, "INTR SVC         : %u\n",
		   qca->intr_svc);

	seq_printf(s, "SPI max speed    : %lu\n",
		   (unsigned long)qca->spi_dev->max_speed_hz);
	seq_printf(s, "SPI mode         : %x\n",
		   qca->spi_dev->mode);
	seq_printf(s, "SPI chip select  : %u\n",
		   (unsigned int)qca->spi_dev->chip_select);
	seq_printf(s, "SPI legacy mode  : %u\n",
		   (unsigned int)qca->legacy_mode);
	seq_printf(s, "SPI burst length : %u\n",
		   (unsigned int)qca->burst_len);

	return 0;
}

static int
qcaspi_info_open(struct inode *inode, struct file *file)
{
	return single_open(file, qcaspi_info_show, inode->i_private);
}

static const struct file_operations qcaspi_info_ops = {
	.open = qcaspi_info_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

void
qcaspi_init_device_debugfs(struct qcaspi *qca)
{
	struct dentry *device_root;

	device_root = debugfs_create_dir(dev_name(&qca->net_dev->dev), NULL);
	qca->device_root = device_root;

	if (IS_ERR(device_root) || !device_root) {
		pr_warn("failed to create debugfs directory for %s\n",
			dev_name(&qca->net_dev->dev));
		return;
	}
	debugfs_create_file("info", S_IFREG | S_IRUGO, device_root, qca,
			    &qcaspi_info_ops);
}

void
qcaspi_remove_device_debugfs(struct qcaspi *qca)
{
	debugfs_remove_recursive(qca->device_root);
}

#else /* CONFIG_DEBUG_FS */

void
qcaspi_init_device_debugfs(struct qcaspi *qca)
{
}

void
qcaspi_remove_device_debugfs(struct qcaspi *qca)
{
}

#endif

static void
qcaspi_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *p)
{
	struct qcaspi *qca = netdev_priv(dev);

	strlcpy(p->driver, QCASPI_DRV_NAME, sizeof(p->driver));
	strlcpy(p->version, QCASPI_DRV_VERSION, sizeof(p->version));
	strlcpy(p->fw_version, "QCA7000", sizeof(p->fw_version));
	strlcpy(p->bus_info, dev_name(&qca->spi_dev->dev),
		sizeof(p->bus_info));
}

static int
qcaspi_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	cmd->transceiver = XCVR_INTERNAL;
	cmd->supported = SUPPORTED_10baseT_Half;
	ethtool_cmd_speed_set(cmd,  SPEED_10);
	cmd->duplex = DUPLEX_HALF;
	cmd->port = PORT_OTHER;
	cmd->autoneg = AUTONEG_DISABLE;

	return 0;
}

static void
qcaspi_get_ethtool_stats(struct net_device *dev, struct ethtool_stats *estats, u64 *data)
{
	struct qcaspi *qca = netdev_priv(dev);
	struct qcaspi_stats *st = &qca->stats;

	memcpy(data, st, ARRAY_SIZE(qcaspi_gstrings_stats) * sizeof(u64));
}

static void
qcaspi_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
{
	switch (stringset) {
	case ETH_SS_STATS:
		memcpy(buf, &qcaspi_gstrings_stats,
		       sizeof(qcaspi_gstrings_stats));
		break;
	default:
		WARN_ON(1);
		break;
	}
}

static int
qcaspi_get_sset_count(struct net_device *dev, int sset)
{
	switch (sset) {
	case ETH_SS_STATS:
		return ARRAY_SIZE(qcaspi_gstrings_stats);
	default:
		return -EINVAL;
	}
}

static int
qcaspi_get_regs_len(struct net_device *dev)
{
	return sizeof(u32) * QCASPI_MAX_REGS;
}

static void
qcaspi_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
{
	struct qcaspi *qca = netdev_priv(dev);
	u32 *regs_buff = p;
	unsigned int i;

	regs->version = 1;
	memset(regs_buff, 0, sizeof(u32) * QCASPI_MAX_REGS);

	for (i = 0; i < ARRAY_SIZE(qcaspi_spi_regs); i++) {
		u16 offset, value;

		qcaspi_read_register(qca, qcaspi_spi_regs[i], &value);
		offset = qcaspi_spi_regs[i] >> 8;
		regs_buff[offset] = value;
	}
}

static void
qcaspi_get_ringparam(struct net_device *dev, struct ethtool_ringparam *ring)
{
	struct qcaspi *qca = netdev_priv(dev);

	ring->rx_max_pending = 4;
	ring->tx_max_pending = TX_RING_MAX_LEN;
	ring->rx_pending = 4;
	ring->tx_pending = qca->txr.count;
}

static int
qcaspi_set_ringparam(struct net_device *dev, struct ethtool_ringparam *ring)
{
	struct qcaspi *qca = netdev_priv(dev);

	if ((ring->rx_pending) ||
	    (ring->rx_mini_pending) ||
	    (ring->rx_jumbo_pending))
		return -EINVAL;

	if (netif_running(dev))
		qcaspi_netdev_close(dev);

	qca->txr.count = max_t(u32, ring->tx_pending, TX_RING_MIN_LEN);
	qca->txr.count = min_t(u16, qca->txr.count, TX_RING_MAX_LEN);

	if (netif_running(dev))
		qcaspi_netdev_open(dev);

	return 0;
}

static const struct ethtool_ops qcaspi_ethtool_ops = {
	.get_drvinfo = qcaspi_get_drvinfo,
	.get_link = ethtool_op_get_link,
	.get_settings = qcaspi_get_settings,
	.get_ethtool_stats = qcaspi_get_ethtool_stats,
	.get_strings = qcaspi_get_strings,
	.get_sset_count = qcaspi_get_sset_count,
	.get_regs_len = qcaspi_get_regs_len,
	.get_regs = qcaspi_get_regs,
	.get_ringparam = qcaspi_get_ringparam,
	.set_ringparam = qcaspi_set_ringparam,
};

void qcaspi_set_ethtool_ops(struct net_device *dev)
{
	dev->ethtool_ops = &qcaspi_ethtool_ops;
}