static int ia_start()

in iphase.c [2507:2607]

• 88 lines of code
• 11 McCabe index (conditional complexity)

static int ia_start(struct atm_dev *dev)
{  
	IADEV *iadev;  
	int error;  
	unsigned char phy;  
	u32 ctrl_reg;  
	IF_EVENT(printk(">ia_start\n");)  
	iadev = INPH_IA_DEV(dev);  
        if (request_irq(iadev->irq, &ia_int, IRQF_SHARED, DEV_LABEL, dev)) {
                printk(KERN_ERR DEV_LABEL "(itf %d): IRQ%d is already in use\n",  
                    dev->number, iadev->irq);  
		error = -EAGAIN;
		goto err_out;
        }  
        /* @@@ should release IRQ on error */  
	/* enabling memory + master */  
        if ((error = pci_write_config_word(iadev->pci,   
				PCI_COMMAND,   
				PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER )))   
	{  
                printk(KERN_ERR DEV_LABEL "(itf %d): can't enable memory+"  
                    "master (0x%x)\n",dev->number, error);  
		error = -EIO;  
		goto err_free_irq;
        }  
	udelay(10);  
  
	/* Maybe we should reset the front end, initialize Bus Interface Control   
		Registers and see. */  
  
	IF_INIT(printk("Bus ctrl reg: %08x\n", 
                            readl(iadev->reg+IPHASE5575_BUS_CONTROL_REG));)  
	ctrl_reg = readl(iadev->reg+IPHASE5575_BUS_CONTROL_REG);  
	ctrl_reg = (ctrl_reg & (CTRL_LED | CTRL_FE_RST))  
			| CTRL_B8  
			| CTRL_B16  
			| CTRL_B32  
			| CTRL_B48  
			| CTRL_B64  
			| CTRL_B128  
			| CTRL_ERRMASK  
			| CTRL_DLETMASK		/* shud be removed l8r */  
			| CTRL_DLERMASK  
			| CTRL_SEGMASK  
			| CTRL_REASSMASK 	  
			| CTRL_FEMASK  
			| CTRL_CSPREEMPT;  
  
       writel(ctrl_reg, iadev->reg+IPHASE5575_BUS_CONTROL_REG);   
  
	IF_INIT(printk("Bus ctrl reg after initializing: %08x\n", 
                           readl(iadev->reg+IPHASE5575_BUS_CONTROL_REG));  
	   printk("Bus status reg after init: %08x\n", 
                            readl(iadev->reg+IPHASE5575_BUS_STATUS_REG));)  
    
        ia_hw_type(iadev); 
	error = tx_init(dev);  
	if (error)
		goto err_free_irq;
	error = rx_init(dev);  
	if (error)
		goto err_free_tx;
  
	ctrl_reg = readl(iadev->reg+IPHASE5575_BUS_CONTROL_REG);  
       	writel(ctrl_reg | CTRL_FE_RST, iadev->reg+IPHASE5575_BUS_CONTROL_REG);   
	IF_INIT(printk("Bus ctrl reg after initializing: %08x\n", 
                               readl(iadev->reg+IPHASE5575_BUS_CONTROL_REG));)  
        phy = 0; /* resolve compiler complaint */
        IF_INIT ( 
	if ((phy=ia_phy_get(dev,0)) == 0x30)  
		printk("IA: pm5346,rev.%d\n",phy&0x0f);  
	else  
		printk("IA: utopia,rev.%0x\n",phy);) 

	if (iadev->phy_type &  FE_25MBIT_PHY)
           ia_mb25_init(iadev);
	else if (iadev->phy_type & (FE_DS3_PHY | FE_E3_PHY))
           ia_suni_pm7345_init(iadev);
	else {
		error = suni_init(dev);
		if (error)
			goto err_free_rx;
		if (dev->phy->start) {
			error = dev->phy->start(dev);
			if (error)
				goto err_free_rx;
		}
		/* Get iadev->carrier_detect status */
		ia_frontend_intr(iadev);
	}
	return 0;

err_free_rx:
	ia_free_rx(iadev);
err_free_tx:
	ia_free_tx(iadev);
err_free_irq:
	free_irq(iadev->irq, dev);  
err_out:
	return error;
}