path: root/drivers/net/pasemi_mac.c

/*
 * Copyright (C) 2006-2007 PA Semi, Inc
 *
 * Driver for the PA Semi PWRficient onchip 1G/10G Ethernet MACs
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/dmaengine.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <asm/dma-mapping.h>
#include <linux/in.h>
#include <linux/skbuff.h>

#include <linux/ip.h>
#include <linux/tcp.h>
#include <net/checksum.h>

#include "pasemi_mac.h"


/* TODO list
 *
 * - Get rid of pci_{read,write}_config(), map registers with ioremap
 *   for performance
 * - PHY support
 * - Multicast support
 * - Large MTU support
 * - Other performance improvements
 */


/* Must be a power of two */
#define RX_RING_SIZE 512
#define TX_RING_SIZE 512

#define TX_DESC(mac, num)	((mac)->tx->desc[(num) & (TX_RING_SIZE-1)])
#define TX_DESC_INFO(mac, num)	((mac)->tx->desc_info[(num) & (TX_RING_SIZE-1)])
#define RX_DESC(mac, num)	((mac)->rx->desc[(num) & (RX_RING_SIZE-1)])
#define RX_DESC_INFO(mac, num)	((mac)->rx->desc_info[(num) & (RX_RING_SIZE-1)])
#define RX_BUFF(mac, num)	((mac)->rx->buffers[(num) & (RX_RING_SIZE-1)])

#define BUF_SIZE 1646 /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */

/* XXXOJN these should come out of the device tree some day */
#define PAS_DMA_CAP_BASE   0xe00d0040
#define PAS_DMA_CAP_SIZE   0x100
#define PAS_DMA_COM_BASE   0xe00d0100
#define PAS_DMA_COM_SIZE   0x100

static struct pasdma_status *dma_status;

static int pasemi_get_mac_addr(struct pasemi_mac *mac)
{
	struct pci_dev *pdev = mac->pdev;
	struct device_node *dn = pci_device_to_OF_node(pdev);
	const u8 *maddr;
	u8 addr[6];

	if (!dn) {
		dev_dbg(&pdev->dev,
			  "No device node for mac, not configuring\n");
		return -ENOENT;
	}

	maddr = get_property(dn, "mac-address", NULL);
	if (maddr == NULL) {
		dev_warn(&pdev->dev,
			 "no mac address in device tree, not configuring\n");
		return -ENOENT;
	}

	if (sscanf(maddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &addr[0],
		   &addr[1], &addr[2], &addr[3], &addr[4], &addr[5]) != 6) {
		dev_warn(&pdev->dev,
			 "can't parse mac address, not configuring\n");
		return -EINVAL;
	}

	memcpy(mac->mac_addr, addr, sizeof(addr));
	return 0;
}

static int pasemi_mac_setup_rx_resources(struct net_device *dev)
{
	struct pasemi_mac_rxring *ring;
	struct pasemi_mac *mac = netdev_priv(dev);
	int chan_id = mac->dma_rxch;

	ring = kzalloc(sizeof(*ring), GFP_KERNEL);

	if (!ring)
		goto out_ring;

	spin_lock_init(&ring->lock);

	ring->desc_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
				  RX_RING_SIZE, GFP_KERNEL);

	if (!ring->desc_info)
		goto out_desc_info;

	/* Allocate descriptors */
	ring->desc = dma_alloc_coherent(&mac->dma_pdev->dev,
					RX_RING_SIZE *
					sizeof(struct pas_dma_xct_descr),
					&ring->dma, GFP_KERNEL);

	if (!ring->desc)
		goto out_desc;

	memset(ring->desc, 0, RX_RING_SIZE * sizeof(struct pas_dma_xct_descr));

	ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
					   RX_RING_SIZE * sizeof(u64),
					   &ring->buf_dma, GFP_KERNEL);
	if (!ring->buffers)
		goto out_buffers;

	memset(ring->buffers, 0, RX_RING_SIZE * sizeof(u64));

	pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_BASEL(chan_id),
			       PAS_DMA_RXCHAN_BASEL_BRBL(ring->dma));

	pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_BASEU(chan_id),
			       PAS_DMA_RXCHAN_BASEU_BRBH(ring->dma >> 32) |
			       PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 2));

	pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_CFG(chan_id),
			       PAS_DMA_RXCHAN_CFG_HBU(1));

	pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXINT_BASEL(mac->dma_if),
			       PAS_DMA_RXINT_BASEL_BRBL(__pa(ring->buffers)));

	pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXINT_BASEU(mac->dma_if),
			       PAS_DMA_RXINT_BASEU_BRBH(__pa(ring->buffers) >> 32) |
			       PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));

	ring->next_to_fill = 0;
	ring->next_to_clean = 0;

	snprintf(ring->irq_name, sizeof(ring->irq_name),
		 "%s rx",