drivers/net/fec_8xx/fec_main.c



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/*
 * Fast Ethernet Controller (FEC) driver for Motorola MPC8xx.
 *
 * Copyright (c) 2003 Intracom S.A. 
 *  by Pantelis Antoniou <panto@intracom.gr>
 *
 * Heavily based on original FEC driver by Dan Malek <dan@embeddededge.com>
 * and modifications by Joakim Tjernlund <joakim.tjernlund@lumentis.se>
 *
 * Released under the GPL
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/bitops.h>
#include <linux/dma-mapping.h>

#include <asm/8xx_immap.h>
#include <asm/pgtable.h>
#include <asm/mpc8xx.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/commproc.h>

#include "fec_8xx.h"

/*************************************************/

#define FEC_MAX_MULTICAST_ADDRS	64

/*************************************************/

static char version[] __devinitdata =
    DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")" "\n";

MODULE_AUTHOR("Pantelis Antoniou <panto@intracom.gr>");
MODULE_DESCRIPTION("Motorola 8xx FEC ethernet driver");
MODULE_LICENSE("GPL");

int fec_8xx_debug = -1;		/* -1 == use FEC_8XX_DEF_MSG_ENABLE as value */
module_param(fec_8xx_debug, int, 0);
MODULE_PARM_DESC(fec_8xx_debug,
		 "FEC 8xx bitmapped debugging message enable value");


/*************************************************/

/*
 * Delay to wait for FEC reset command to complete (in us) 
 */
#define FEC_RESET_DELAY		50

/*****************************************************************************************/

static void fec_whack_reset(fec_t * fecp)
{
	int i;

	/*
	 * Whack a reset.  We should wait for this.  
	 */
	FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_RESET);
	for (i = 0;
	     (FR(fecp, ecntrl) & FEC_ECNTRL_RESET) != 0 && i < FEC_RESET_DELAY;
	     i++)
		udelay(1);

	if (i == FEC_RESET_DELAY)
		printk(KERN_WARNING "FEC Reset timeout!\n");

}

/****************************************************************************/

/*
 * Transmitter timeout.  
 */
#define TX_TIMEOUT (2*HZ)

/****************************************************************************/

/*
 * Returns the CRC needed when filling in the hash table for
 * multicast group filtering
 * pAddr must point to a MAC address (6 bytes)
 */
static __u32 fec_mulicast_calc_crc(char *pAddr)
{
	u8 byte;
	int byte_count;
	int bit_count;
	__u32 crc = 0xffffffff;
	u8 msb;

	for (byte_count = 0; byte_count < 6; byte_count++) {
		byte = pAddr[byte_count];
		for (bit_count = 0; bit_count < 8; bit_count++) {
			msb = crc >> 31;
			crc <<= 1;
			if (msb ^ (byte & 0x1)) {
				crc ^= FEC_CRC_POLY;
			}
			byte >>= 1;
		}
	}
	return (crc);
}

/*
 * Set or clear the multicast filter for this adaptor.
 * Skeleton taken from sunlance driver.
 * The CPM Ethernet implementation allows Multicast as well as individual
 * MAC address filtering.  Some of the drivers check to make sure it is
 * a group multicast address, and discard those that are not.  I guess I
 * will do the same for now, but just remove the test if you want
 * individual filtering as well (do the upper net layers want or support
 * this kind of feature?).
 */
static void fec_set_multicast_list(struct net_device *dev)
{
	struct fec_enet_private *fep = netdev_priv(dev);
	fec_t *fecp = fep->fecp;
	struct dev_mc_list *pmc;
	__u32 crc;
	int temp;
	__u32 csrVal;
	int hash_index;
	__u32 hthi, htlo;
	unsigned long flags;


	if ((dev->flags & IFF_PROMISC) != 0) {

		spin_lock_irqsave(&fep->lock, flags);
		FS(fecp, r_cntrl, FEC_RCNTRL_PROM);
		spin_unlock_irqrestore(&fep->lock, flags);

		/*
		 * Log any net taps. 
		 */
		printk(KERN_WARNING DRV_MODULE_NAME
		       ": %s: Promiscuous mode enabled.\n", dev->name);
		return;

	}

	if ((dev->flags & IFF_ALLMULTI) != 0 ||
	    dev->mc_count > FEC_MAX_MULTICAST_ADDRS) {
		/*
		 * Catch all multicast addresses, set the filter to all 1's.
		 */
		hthi = 0xffffffffU;
		htlo = 0xffffffffU;
	} else {
		hthi = 0;
		htlo = 0;

		/*
		 * Now populate the hash table 
		 */
		for (pmc = dev->mc_list; pmc != NULL; pmc = pmc->next) {
			crc = fec_mulicast_calc_crc(pmc->dmi_addr);
			temp = (crc & 0x3f) >> 1;