path: root/drivers/net/ftmac100.c

/*
 * Faraday FTMAC100 10/100 Ethernet
 *
 * (C) Copyright 2009-2011 Faraday Technology
 * Po-Yu Chuang <ratbert@faraday-tech.com>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

#include <linux/dma-mapping.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/mii.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/platform_device.h>

#include "ftmac100.h"

#define DRV_NAME	"ftmac100"
#define DRV_VERSION	"0.2"

#define RX_QUEUE_ENTRIES	128	/* must be power of 2 */
#define TX_QUEUE_ENTRIES	16	/* must be power of 2 */

#define MAX_PKT_SIZE		1518
#define RX_BUF_SIZE		2044	/* must be smaller than 0x7ff */

#if MAX_PKT_SIZE > 0x7ff
#error invalid MAX_PKT_SIZE
#endif

#if RX_BUF_SIZE > 0x7ff || RX_BUF_SIZE > PAGE_SIZE
#error invalid RX_BUF_SIZE
#endif

/******************************************************************************
 * private data
 *****************************************************************************/
struct ftmac100_descs {
	struct ftmac100_rxdes rxdes[RX_QUEUE_ENTRIES];
	struct ftmac100_txdes txdes[TX_QUEUE_ENTRIES];
};

struct ftmac100 {
	struct resource *res;
	void __iomem *base;
	int irq;

	struct ftmac100_descs *descs;
	dma_addr_t descs_dma_addr;

	unsigned int rx_pointer;
	unsigned int tx_clean_pointer;
	unsigned int tx_pointer;
	unsigned int tx_pending;

	spinlock_t tx_lock;

	struct net_device *netdev;
	struct device *dev;
	struct napi_struct napi;

	struct mii_if_info mii;
};

static int ftmac100_alloc_rx_page(struct ftmac100 *priv,
				  struct ftmac100_rxdes *rxdes, gfp_t gfp);

/******************************************************************************
 * internal functions (hardware register access)
 *****************************************************************************/
#define INT_MASK_ALL_ENABLED	(FTMAC100_INT_RPKT_FINISH	| \
				 FTMAC100_INT_NORXBUF		| \
				 FTMAC100_INT_XPKT_OK		| \
				 FTMAC100_INT_XPKT_LOST		| \
				 FTMAC100_INT_RPKT_LOST		| \
				 FTMAC100_INT_AHB_ERR		| \
				 FTMAC100_INT_PHYSTS_CHG)

#define INT_MASK_ALL_DISABLED	0

static void ftmac100_enable_all_int(struct ftmac100 *priv)
{
	iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTMAC100_OFFSET_IMR);
}

static void ftmac100_disable_all_int(struct ftmac100 *priv)
{
	iowrite32(INT_MASK_ALL_DISABLED, priv->base + FTMAC100_OFFSET_IMR);
}

static void ftmac100_set_rx_ring_base(struct ftmac100 *priv, dma_addr_t addr)
{
	iowrite32(addr, priv->base + FTMAC100_OFFSET_RXR_BADR);
}

static void ftmac100_set_tx_ring_base(struct ftmac100 *priv, dma_addr_t addr)
{
	iowrite32(addr, priv->base + FTMAC100_OFFSET_TXR_BADR);
}

static void ftmac100_txdma_start_polling(struct ftmac100 *priv)
{
	iowrite32(1, priv->base + FTMAC100_OFFSET_TXPD);
}

static int ftmac100_reset(struct ftmac100 *priv)
{
	struct net_device *netdev = priv->netdev;
	int i;

	/* NOTE: reset clears all registers */
	iowrite32(FTMAC100_MACCR_SW_RST, priv->base + FTMAC100_OFFSET_MACCR);

	for (i = 0; i < 5; i++) {
		unsigned int maccr;

		maccr = ioread32(priv->base + FTMAC100_OFFSET_MACCR);
		if (!(maccr & FTMAC100_MACCR_SW_RST)) {
			/*
			 * FTMAC100_MACCR_SW_RST cleared does not indicate
			 * that hardware reset completed (what the f*ck).
			 * We still need to wait for a while.
			 */
			udelay(