path: root/drivers/net/mace.c

/*
 * Network device driver for the MACE ethernet controller on
 * Apple Powermacs.  Assumes it's under a DBDMA controller.
 *
 * Copyright (C) 1996 Paul Mackerras.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/crc32.h>
#include <linux/spinlock.h>
#include <linux/bitrev.h>
#include <asm/prom.h>
#include <asm/dbdma.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/macio.h>

#include "mace.h"

static int port_aaui = -1;

#define N_RX_RING	8
#define N_TX_RING	6
#define MAX_TX_ACTIVE	1
#define NCMDS_TX	1	/* dma commands per element in tx ring */
#define RX_BUFLEN	(ETH_FRAME_LEN + 8)
#define TX_TIMEOUT	HZ	/* 1 second */

/* Chip rev needs workaround on HW & multicast addr change */
#define BROKEN_ADDRCHG_REV	0x0941

/* Bits in transmit DMA status */
#define TX_DMA_ERR	0x80

struct mace_data {
    volatile struct mace __iomem *mace;
    volatile struct dbdma_regs __iomem *tx_dma;
    int tx_dma_intr;
    volatile struct dbdma_regs __iomem *rx_dma;
    int rx_dma_intr;
    volatile struct dbdma_cmd *tx_cmds;	/* xmit dma command list */
    volatile struct dbdma_cmd *rx_cmds;	/* recv dma command list */
    struct sk_buff *rx_bufs[N_RX_RING];
    int rx_fill;
    int rx_empty;
    struct sk_buff *tx_bufs[N_TX_RING];
    int tx_fill;
    int tx_empty;
    unsigned char maccc;
    unsigned char tx_fullup;
    unsigned char tx_active;
    unsigned char tx_bad_runt;
    struct timer_list tx_timeout;
    int timeout_active;
    int port_aaui;
    int chipid;
    struct macio_dev *mdev;
    spinlock_t lock;
};

/*
 * Number of bytes of private data per MACE: allow enough for
 * the rx and tx dma commands plus a branch dma command each,
 * and another 16 bytes to allow us to align the dma command
 * buffers on a 16 byte boundary.
 */
#define PRIV_BYTES	(sizeof(struct mace_data) \
	+ (N_RX_RING + NCMDS_TX * N_TX_RING + 3) * sizeof(struct dbdma_cmd))

static int mace_open(struct net_device *dev);
static int mace_close(struct net_device *dev);
static int mace_xmit_start(struct sk_buff *skb, struct net_device *dev);
static void mace_set_multicast(struct net_device *dev);
static void mace_reset(struct net_device *dev);
static int mace_set_address(struct net_device *dev, void *addr);
static irqreturn_t mace_interrupt(int irq, void *dev_id);
static irqreturn_t mace_txdma_intr(int irq, void *dev_id);
static irqreturn_t mace_rxdma_intr(int irq, void *dev_id);
static void mace_set_timeout(struct net_device *dev);
static void mace_tx_timeout(unsigned long data);
static inline void dbdma_reset(volatile struct dbdma_regs __iomem *dma);
static inline void mace_clean_rings(struct mace_data *mp);
static void __mace_set_address(struct net_device *dev, void *addr);

/*
 * If we can't get a skbuff when we need it, we use this area for DMA.
 */
static unsigned char *dummy_buf;

static const struct net_device_ops mace_netdev_ops = {
	.ndo_open		= mace_open,
	.ndo_stop		= mace_close,
	.ndo_start_xmit		= mace_xmit_start,
	.ndo_set_multicast_list	= mace_set_multicast,
	.ndo_set_mac_address	= mace_set_address,
	.ndo_change_mtu		= eth_change_mtu,
	.ndo_validate_addr	= eth_validate_addr,
};

static int __devinit mace_probe(struct macio_dev *mdev, const struct of_device_id *match)
{
	struct device_node *mace = macio_get_of_node(mdev);
	struct net_device *dev;
	struct mace_data *mp;
	const unsigned char *addr;
	int j, rev, rc = -EBUSY;

	if (macio_resource_count(mdev) != 3 || macio_irq_count(mdev) != 3) {
		printk(KERN_ERR "can't use MACE %s: need 3 addrs and 3 irqs\n",
		       mace->full_name);
		return -ENODEV;
	}

	addr = of_get_property(mace, "mac-address", NULL);
	if (addr == NULL) {
		addr = of_get_property(mace, "local-mac-address", NULL);
		if (addr == NULL) {
			printk(KERN_ERR "Can't get mac-address for MACE %s\n",
			       mace->full_name);
			return -ENODEV;
		}
	}

	/*
	 * lazy