defxx.c

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 *
 * Assumptions:
 *   This routine should only be called for a device that was
 *   initialized successfully.
 *
 * Side Effects:
 *   Adapter should be in LINK_AVAILABLE or LINK_UNAVAILABLE state
 *   if the open is successful.
 */

static int dfx_open(struct net_device *dev)
{
	DFX_board_t	*bp = (DFX_board_t *)dev->priv;

	DBG_printk("In dfx_open...\n");
	
	MOD_INC_USE_COUNT;

	/* Register IRQ - support shared interrupts by passing device ptr */

	if (request_irq(dev->irq, (void *)dfx_interrupt, SA_SHIRQ, dev->name, dev))
	{
		printk(KERN_ERR "%s: Requested IRQ %d is busy\n", dev->name, dev->irq);
		MOD_DEC_USE_COUNT;
		return -EAGAIN;
	}

	/*
	 * Set current address to factory MAC address
	 *
	 * Note: We've already done this step in dfx_driver_init.
	 *       However, it's possible that a user has set a node
	 *		 address override, then closed and reopened the
	 *		 adapter.  Unless we reset the device address field
	 *		 now, we'll continue to use the existing modified
	 *		 address.
	 */

	memcpy(dev->dev_addr, bp->factory_mac_addr, FDDI_K_ALEN);

	/* Clear local unicast/multicast address tables and counts */

	memset(bp->uc_table, 0, sizeof(bp->uc_table));
	memset(bp->mc_table, 0, sizeof(bp->mc_table));
	bp->uc_count = 0;
	bp->mc_count = 0;

	/* Disable promiscuous filter settings */

	bp->ind_group_prom	= PI_FSTATE_K_BLOCK;
	bp->group_prom		= PI_FSTATE_K_BLOCK;

	spin_lock_init(&bp->lock);

	/* Reset and initialize adapter */

	bp->reset_type = PI_PDATA_A_RESET_M_SKIP_ST;	/* skip self-test */
	if (dfx_adap_init(bp) != DFX_K_SUCCESS)
	{
		printk(KERN_ERR "%s: Adapter open failed!\n", dev->name);
		free_irq(dev->irq, dev);
		MOD_DEC_USE_COUNT;
		return -EAGAIN;
	}

	/* Set device structure info */
	netif_start_queue(dev);
	return(0);
}


/*
 * =============
 * = dfx_close =
 * =============
 *   
 * Overview:
 *   Closes the device/module.
 *  
 * Returns:
 *   Condition code
 *       
 * Arguments:
 *   dev - pointer to device information
 *
 * Functional Description:
 *   This routine closes the adapter and brings it to a safe state.
 *   The interrupt service routine is deregistered with the OS.
 *   The adapter can be opened again with another call to dfx_open().
 *
 * Return Codes:
 *   Always return 0.
 *
 * Assumptions:
 *   No further requests for this adapter are made after this routine is
 *   called.  dfx_open() can be called to reset and reinitialize the
 *   adapter.
 *
 * Side Effects:
 *   Adapter should be in DMA_UNAVAILABLE state upon completion of this
 *   routine.
 */

static int dfx_close(struct net_device *dev)
{
	DFX_board_t	*bp = (DFX_board_t *)dev->priv;

	DBG_printk("In dfx_close...\n");

	/* Disable PDQ interrupts first */

	dfx_port_write_long(bp, PI_PDQ_K_REG_HOST_INT_ENB, PI_HOST_INT_K_DISABLE_ALL_INTS);

	/* Place adapter in DMA_UNAVAILABLE state by resetting adapter */

	(void) dfx_hw_dma_uninit(bp, PI_PDATA_A_RESET_M_SKIP_ST);

	/*
	 * Flush any pending transmit buffers
	 *
	 * Note: It's important that we flush the transmit buffers
	 *		 BEFORE we clear our copy of the Type 2 register.
	 *		 Otherwise, we'll have no idea how many buffers
	 *		 we need to free.
	 */

	dfx_xmt_flush(bp);

	/*
	 * Clear Type 1 and Type 2 registers after adapter reset
	 *
	 * Note: Even though we're closing the adapter, it's
	 *       possible that an interrupt will occur after
	 *		 dfx_close is called.  Without some assurance to
	 *		 the contrary we want to make sure that we don't
	 *		 process receive and transmit LLC frames and update
	 *		 the Type 2 register with bad information.
	 */

	bp->cmd_req_reg.lword	= 0;
	bp->cmd_rsp_reg.lword	= 0;
	bp->rcv_xmt_reg.lword	= 0;

	/* Clear consumer block for the same reason given above */

	memset(bp->cons_block_virt, 0, sizeof(PI_CONSUMER_BLOCK));

	/* Clear device structure flags */

	netif_stop_queue(dev);
	
	/* Deregister (free) IRQ */

	free_irq(dev->irq, dev);
	
	MOD_DEC_USE_COUNT;
	return(0);
}


/*
 * ======================
 * = dfx_int_pr_halt_id =
 * ======================
 *   
 * Overview:
 *   Displays halt id's in string form.
 *  
 * Returns:
 *   None
 *       
 * Arguments:
 *   bp - pointer to board information
 *
 * Functional Description:
 *   Determine current halt id and display appropriate string.
 *
 * Return Codes:
 *   None
 *
 * Assumptions:
 *   None
 *
 * Side Effects:
 *   None
 */

static void dfx_int_pr_halt_id(DFX_board_t	*bp)
	{
	PI_UINT32	port_status;			/* PDQ port status register value */
	PI_UINT32	halt_id;				/* PDQ port status halt ID */

	/* Read the latest port status */

	dfx_port_read_long(bp, PI_PDQ_K_REG_PORT_STATUS, &port_status);

	/* Display halt state transition information */

	halt_id = (port_status & PI_PSTATUS_M_HALT_ID) >> PI_PSTATUS_V_HALT_ID;
	switch (halt_id)
		{
		case PI_HALT_ID_K_SELFTEST_TIMEOUT:
			printk("%s: Halt ID: Selftest Timeout\n", bp->dev->name);
			break;

		case PI_HALT_ID_K_PARITY_ERROR:
			printk("%s: Halt ID: Host Bus Parity Error\n", bp->dev->name);
			break;

		case PI_HALT_ID_K_HOST_DIR_HALT:
			printk("%s: Halt ID: Host-Directed Halt\n", bp->dev->name);
			break;

		case PI_HALT_ID_K_SW_FAULT:
			printk("%s: Halt ID: Adapter Software Fault\n", bp->dev->name);
			break;

		case PI_HALT_ID_K_HW_FAULT:
			printk("%s: Halt ID: Adapter Hardware Fault\n", bp->dev->name);
			break;

		case PI_HALT_ID_K_PC_TRACE:
			printk("%s: Halt ID: FDDI Network PC Trace Path Test\n", bp->dev->name);
			break;

		case PI_HALT_ID_K_DMA_ERROR:
			printk("%s: Halt ID: Adapter DMA Error\n", bp->dev->name);
			break;

		case PI_HALT_ID_K_IMAGE_CRC_ERROR:
			printk("%s: Halt ID: Firmware Image CRC Error\n", bp->dev->name);
			break;

		case PI_HALT_ID_K_BUS_EXCEPTION:
			printk("%s: Halt ID: 68000 Bus Exception\n", bp->dev->name);
			break;

		default:
			printk("%s: Halt ID: Unknown (code = %X)\n", bp->dev->name, halt_id);
			break;
		}
	return;
	}


/*
 * ==========================
 * = dfx_int_type_0_process =
 * ==========================
 *   
 * Overview:
 *   Processes Type 0 interrupts.
 *  
 * Returns:
 *   None
 *       
 * Arguments:
 *   bp - pointer to board information
 *
 * Functional Description:
 *   Processes all enabled Type 0 interrupts.  If the reason for the interrupt
 *   is a serious fault on the adapter, then an error message is displayed
 *   and the adapter is reset.
 *
 *   One tricky potential timing window is the rapid succession of "link avail"
 *   "link unavail" state change interrupts.  The acknowledgement of the Type 0
 *   interrupt must be done before reading the state from the Port Status
 *   register.  This is true because a state change could occur after reading
 *   the data, but before acknowledging the interrupt.  If this state change
 *   does happen, it would be lost because the driver is using the old state,
 *   and it will never know about the new state because it subsequently
 *   acknowledges the state change interrupt.
 *
 *          INCORRECT                                      CORRECT
 *      read type 0 int reasons                   read type 0 int reasons
 *      read adapter state                        ack type 0 interrupts
 *      ack type 0 interrupts                     read adapter state
 *      ... process interrupt ...                 ... process interrupt ...
 *
 * Return Codes:
 *   None
 *
 * Assumptions:
 *   None
 *
 * Side Effects:
 *   An adapter reset may occur if the adapter has any Type 0 error interrupts
 *   or if the port status indicates that the adapter is halted.  The driver
 *   is responsible for reinitializing the adapter with the current CAM
 *   contents and adapter filter settings.
 */

static void dfx_int_type_0_process(DFX_board_t	*bp)

	{
	PI_UINT32	type_0_status;		/* Host Interrupt Type 0 register */
	PI_UINT32	state;				/* current adap state (from port status) */

	/*
	 * Read host interrupt Type 0 register to determine which Type 0
	 * interrupts are pending.  Immediately write it back out to clear
	 * those interrupts.
	 */

	dfx_port_read_long(bp, PI_PDQ_K_REG_TYPE_0_STATUS, &type_0_status);
	dfx_port_write_long(bp, PI_PDQ_K_REG_TYPE_0_STATUS, type_0_status);

	/* Check for Type 0 error interrupts */

	if (type_0_status & (PI_TYPE_0_STAT_M_NXM |
							PI_TYPE_0_STAT_M_PM_PAR_ERR |
							PI_TYPE_0_STAT_M_BUS_PAR_ERR))
		{
		/* Check for Non-Existent Memory error */

		if (type_0_status & PI_TYPE_0_STAT_M_NXM)
			printk("%s: Non-Existent Memory Access Error\n", bp->dev->name);

		/* Check for Packet Memory Parity error */

		if (type_0_status & PI_TYPE_0_STAT_M_PM_PAR_ERR)
			printk("%s: Packet Memory Parity Error\n", bp->dev->name);

		/* Check for Host Bus Parity error */

		if (type_0_status & PI_TYPE_0_STAT_M_BUS_PAR_ERR)
			printk("%s: Host Bus Parity Error\n", bp->dev->name);

		/* Reset adapter and bring it back on-line */

		bp->link_available = PI_K_FALSE;	/* link is no longer available */
		bp->reset_type = 0;					/* rerun on-board diagnostics */
		printk("%s: Resetting adapter...\n", bp->dev->name);
		if (dfx_adap_init(bp) != DFX_K_SUCCESS)
			{
			printk("%s: Adapter reset failed!  Disabling adapter interrupts.\n", bp->dev->name);
			dfx_port_write_long(bp, PI_PDQ_K_REG_HOST_INT_ENB, PI_HOST_INT_K_DISABLE_ALL_INTS);
			return;
			}
		printk("%s: Adapter reset successful!\n", bp->dev->name);
		return;
		}

	/* Check for transmit flush interrupt */

	if (type_0_status & PI_TYPE_0_STAT_M_XMT_FLUSH)
		{
		/* Flush any pending xmt's and acknowledge the flush interrupt */

		bp->link_available = PI_K_FALSE;		/* link is no longer available */
		dfx_xmt_flush(bp);						/* flush any outstanding packets */
		(void) dfx_hw_port_ctrl_req(bp,
									PI_PCTRL_M_XMT_DATA_FLUSH_DONE,
									0,
									0,
									NULL);
		}

	/* Check for adapter state change */

	if (type_0_status & PI_TYPE_0_STAT_M_STATE_CHANGE)
		{                     
		/* Get latest adapter state */

		state = dfx_hw_adap_state_rd(bp);	/* get adapter state */
		if (state == PI_STATE_K_HALTED)
			{
			/*
			 * Adapter has transitioned to HALTED state, try to reset
			 * adapter to bring it back on-line.  If reset fails,
			 * leave the adapter in the broken state.
			 */

			printk("%s: Controller has transitioned to HALTED state!\n", bp->dev->name);
			dfx_int_pr_halt_id(bp);			/* display halt id as string */

			/* Reset adapter and bring it back on-line */

			bp->link_available = PI_K_FALSE;	/* link is no longer available */
			bp->reset_type = 0;					/* rerun on-board diagnostics */
			printk("%s: Resetting adapter...\n", bp->dev->name);
			if (dfx_adap_init(bp) != DFX_K_SUCCESS)
				{
				printk("%s: Adapter reset failed!  Disabling adapter interrupts.\n", bp->dev->name);
				dfx_port_write_long(bp, PI_PDQ_K_REG_HOST_INT_ENB, PI_HOST_INT_K_DISABLE_ALL_INTS);
				return;
				}
			printk("%s: Adapter reset successful!\n", bp->dev->name);
			}
		else if (state == PI_STATE_K_LINK_AVAIL)
			{