Miscellany

/*                                                                              
 * Some platforms expect the MAC addresses in the Flash OTP                     
 * If not or if the OTP is unprogrammed, it uses the defaults                   
 * provided earlier in this file                                                
*/                                                                              
static int get_otp_MACAddress(struct net_device *ndev, priv_data_t *priv)       
{                                                                               
        u32     faddr;                                                          
        u32     flashbase;                                                      
        u32     low_mac;                                                        
        int     i;                                                              
                                                                                
// We only need 6 bytes but a page is probably the smallest that                
// gets mapped.                                                                 
#define OTP_IOREMAP_SIZE        PAGE_SIZE                                       
                                                                                
//      flashbase = IXP425_EXP_BUS_CS0_BASE_PHYS;                               
        flashbase = IXP4XX_EXP_BUS_BASE(0);                                     
        faddr = (u32)ioremap (flashbase, OTP_IOREMAP_SIZE);
        if (!faddr)                                                             
        {                                                                       
                release_mem_region (flashbase, OTP_IOREMAP_SIZE);               
                printk (KERN_ERR "%s: unable to ioremap flash\n", __FUNCTION__);
                return -1;                                                      
        }                                                                       
        // Send the query command to the flash.                                 
        writew (0x9090, faddr);                                                 
        for (i = 0; i < 6; i++) {                                               
                ndev->dev_addr[i] = readb (faddr + 0x10a + i);                  
        }                                                                       
        // Take flash out of query mode                                         
        writew (0xffff, faddr);                                                 
        if (faddr) iounmap ((void *)faddr);                                     
                                                                                
        // Check for a valid OTP                                                
        if (ndev->dev_addr[0] != 0xFF)                                          
        {                                                                       
                // Valid OTP                                                    
                // Concatenate the lower 3 bytes of the base MAC address
                // to use to calculate the MAC address for the requested port   
                low_mac = ((0x000000FF & ndev->dev_addr[3]) << 16) + ((0x000000F
F & ndev->dev_addr[4]) << 8) + ndev->dev_addr[5];                               
                // There should never be an overflow here.  If there is,        
                // we would have to violate the OUI domain.  So, just           
                // take what we get (at least keep in the right domain)         
                low_mac = low_mac + priv->port_id;                              
                ndev->dev_addr[3] = (unsigned char) ((low_mac & 0x00FF0000) >> 1
6);                                                                             
                ndev->dev_addr[4] = (unsigned char) ((low_mac & 0x0000FF00) >> 8
);                                                                              
                ndev->dev_addr[5] = (unsigned char) (low_mac & 0x000000FF);     
        } else {                                                                
                // Invalid OTP                                                  
                // Do it the old fashioned way                                  
                memcpy(ndev->dev_addr,                                          
                   &default_mac_addr[priv->port_id].macAddress,                 
                   IX_IEEE803_MAC_ADDRESS_SIZE);                                
        }                                                                       
        return 0;                                                               
}