/* cs89x0.c: A Crystal Semiconductor (Now Cirrus Logic) CS89[02]0 *  driver for linux. *//*	Written 1996 by Russell Nelson, with reference to skeleton.c	written 1993-1994 by Donald Becker.	This software may be used and distributed according to the terms	of the GNU General Public License, incorporated herein by reference.        The author may be reached at nelson@crynwr.com, Crynwr        Software, 521 Pleasant Valley Rd., Potsdam, NY 13676  Changelog:  Mike Cruse        : mcruse@cti-ltd.com                    : Changes for Linux 2.0 compatibility.                     : Added dev_id parameter in net_interrupt(),                    : request_irq() and free_irq(). Just NULL for now.  Mike Cruse        : Added MOD_INC_USE_COUNT and MOD_DEC_USE_COUNT macros                    : in net_open() and net_close() so kerneld would know                    : that the module is in use and wouldn't eject the                     : driver prematurely.  Mike Cruse        : Rewrote init_module() and cleanup_module using 8390.c                    : as an example. Disabled autoprobing in init_module(),                    : not a good thing to do to other devices while Linux                    : is running from all accounts.  Russ Nelson       : Jul 13 1998.  Added RxOnly DMA support.  Melody Lee        : Aug 10 1999.  Changes for Linux 2.2.5 compatibility.                     : email: ethernet@crystal.cirrus.com  Alan Cox          : Removed 1.2 support, added 2.1 extra counters.  Andrew Morton     : andrewm@uow.edu.au                    : Kernel 2.3.48                    : Handle kmalloc() failures                    : Other resource allocation fixes                    : Add SMP locks                    : Integrate Russ Nelson's ALLOW_DMA functionality back in.                    : If ALLOW_DMA is true, make DMA runtime selectable                    : Folded in changes from Cirrus (Melody Lee                    : <klee@crystal.cirrus.com>)                    : Don't call netif_wake_queue() in net_send_packet()                    : Fixed an out-of-mem bug in dma_rx()                    : Updated Documentation/cs89x0.txt  Andrew Morton     : andrewm@uow.edu.au / Kernel 2.3.99-pre1                    : Use skb_reserve to longword align IP header (two places)                    : Remove a delay loop from dma_rx()                    : Replace '100' with HZ                    : Clean up a couple of skb API abuses                    : Added 'cs89x0_dma=N' kernel boot option                    : Correctly initialise lp->lock in non-module compile  Andrew Morton     : andrewm@uow.edu.au / Kernel 2.3.99-pre4-1                    : MOD_INC/DEC race fix (see                    : http://www.uwsg.indiana.edu/hypermail/linux/kernel/0003.3/1532.html)  Andrew Morton     : andrewm@uow.edu.au / Kernel 2.4.0-test7-pre2                    : Enhanced EEPROM support to cover more devices,                    :   abstracted IRQ mapping to support CONFIG_ARCH_CLPS7500 arch                    :   (Jason Gunthorpe <jgg@ualberta.ca>)  Andrew Morton     : Kernel 2.4.0-test11-pre4                    : Use dev->name in request_*() (Andrey Panin)                    : Fix an error-path memleak in init_module()                    : Preserve return value from request_irq()                    : Fix type of `media' module parm (Keith Owens)                    : Use SET_MODULE_OWNER()                    : Tidied up strange request_irq() abuse in net_open().  Andrew Morton     : Kernel 2.4.3-pre1                    : Request correct number of pages for DMA (Hugh Dickens)                    : Select PP_ChipID _after_ unregister_netdev in cleanup_module()                    :  because unregister_netdev() calls get_stats.                    : Make `version[]' __initdata                    : Uninlined the read/write reg/word functions.*//* Always include 'config.h' first in case the user wants to turn on   or override something. */#include <linux/config.h>#include <linux/module.h>#include <linux/version.h>/* * Set this to zero to disable DMA code * * Note that even if DMA is turned off we still support the 'dma' and  'use_dma' * module options so we don't break any startup scripts. */#define ALLOW_DMA	1/* * Set this to zero to remove all the debug statements via * dead code elimination */#define DEBUGGING	1/*  Sources:	Crynwr packet driver epktisa.	Crystal Semiconductor data sheets.*/#include <linux/config.h>#include <linux/kernel.h>#include <linux/sched.h>#include <linux/types.h>#include <linux/fcntl.h>#include <linux/interrupt.h>#include <linux/ptrace.h>#include <linux/ioport.h>#include <linux/in.h>#include <linux/slab.h>#include <linux/string.h>#include <linux/init.h>#include <asm/system.h>#include <asm/bitops.h>#include <asm/io.h>#if ALLOW_DMA#include <asm/dma.h>#endif#include <linux/errno.h>#include <linux/spinlock.h>#include <linux/netdevice.h>#include <linux/etherdevice.h>#include <linux/skbuff.h>#include "cs89x0.h"static char version[] __initdata ="cs89x0.c: v2.4.3-pre1 Russell Nelson <nelson@crynwr.com>, Andrew Morton <andrewm@uow.edu.au>\n";/* First, a few definitions that the brave might change.   A zero-terminated list of I/O addresses to be probed. Some special flags..      Addr & 1 = Read back the address port, look for signature and reset                 the page window before probing       Addr & 3 = Reset the page window and probe    The CLPS eval board has the Cirrus chip at 0x80090300, in ARM IO space,   but it is possible that a Cirrus board could be plugged into the ISA   slots. *//* The cs8900 has 4 IRQ pins, software selectable. cs8900_irq_map maps    them to system IRQ numbers. This mapping is card specific and is set to   the configuration of the Cirrus Eval board for this chip. */#ifdef CONFIG_ARCH_CLPS7500static unsigned int netcard_portlist[] __initdata =   { 0x80090303, 0x300, 0x320, 0x340, 0x360, 0x200, 0x220, 0x240, 0x260, 0x280, 0x2a0, 0x2c0, 0x2e0, 0};static unsigned int cs8900_irq_map[] = {12,0,0,0};#elsestatic unsigned int netcard_portlist[] __initdata =   { 0x300, 0x320, 0x340, 0x360, 0x200, 0x220, 0x240, 0x260, 0x280, 0x2a0, 0x2c0, 0x2e0, 0};static unsigned int cs8900_irq_map[] = {10,11,12,5};#endif#if DEBUGGINGstatic unsigned int net_debug = DEBUGGING;#else#define net_debug 0	/* gcc will remove all the debug code for us */#endif/* The number of low I/O ports used by the ethercard. */#define NETCARD_IO_EXTENT	16/* we allow the user to override various values normally set in the EEPROM */#define FORCE_RJ45	0x0001    /* pick one of these three */#define FORCE_AUI	0x0002#define FORCE_BNC	0x0004#define FORCE_AUTO	0x0010    /* pick one of these three */#define FORCE_HALF	0x0020#define FORCE_FULL	0x0030/* Information that need to be kept for each board. */struct net_local {	struct net_device_stats stats;	int chip_type;		/* one of: CS8900, CS8920, CS8920M */	char chip_revision;	/* revision letter of the chip ('A'...) */	int send_cmd;		/* the proper send command: TX_NOW, TX_AFTER_381, or TX_AFTER_ALL */	int auto_neg_cnf;	/* auto-negotiation word from EEPROM */	int adapter_cnf;	/* adapter configuration from EEPROM */	int isa_config;		/* ISA configuration from EEPROM */	int irq_map;		/* IRQ map from EEPROM */	int rx_mode;		/* what mode are we in? 0, RX_MULTCAST_ACCEPT, or RX_ALL_ACCEPT */	int curr_rx_cfg;	/* a copy of PP_RxCFG */	int linectl;		/* either 0 or LOW_RX_SQUELCH, depending on configuration. */	int send_underrun;	/* keep track of how many underruns in a row we get */	int force;		/* force various values; see FORCE* above. */	spinlock_t lock;#if ALLOW_DMA	int use_dma;		/* Flag: we're using dma */	int dma;		/* DMA channel */	int dmasize;		/* 16 or 64 */	unsigned char *dma_buff;	/* points to the beginning of the buffer */	unsigned char *end_dma_buff;	/* points to the end of the buffer */	unsigned char *rx_dma_ptr;	/* points to the next packet  */#endif};/* Index to functions, as function prototypes. */extern int cs89x0_probe(struct net_device *dev);static int cs89x0_probe1(struct net_device *dev, int ioaddr);static int net_open(struct net_device *dev);static int net_send_packet(struct sk_buff *skb, struct net_device *dev);static void net_interrupt(int irq, void *dev_id, struct pt_regs *regs);static void set_multicast_list(struct net_device *dev);static void net_timeout(struct net_device *dev);static void net_rx(struct net_device *dev);static int net_close(struct net_device *dev);static struct net_device_stats *net_get_stats(struct net_device *dev);static void reset_chip(struct net_device *dev);static int get_eeprom_data(struct net_device *dev, int off, int len, int *buffer);static int get_eeprom_cksum(int off, int len, int *buffer);static int set_mac_address(struct net_device *dev, void *addr);static void count_rx_errors(int status, struct net_local *lp);#if ALLOW_DMAstatic void get_dma_channel(struct net_device *dev);static void release_dma_buff(struct net_local *lp);#endif/* Example routines you must write ;->. */#define tx_done(dev) 1/* * Permit 'cs89x0_dma=N' in the kernel boot environment */#if !defined(MODULE) && (ALLOW_DMA != 0)static int g_cs89x0_dma;static int __init dma_fn(char *str){	g_cs89x0_dma = simple_strtol(str,NULL,0);	return 1;}__setup("cs89x0_dma=", dma_fn);#endif	/* !defined(MODULE) && (ALLOW_DMA != 0) *//* Check for a network adaptor of this type, and return '0' iff one exists.   If dev->base_addr == 0, probe all likely locations.   If dev->base_addr == 1, always return failure.   If dev->base_addr == 2, allocate space for the device and return success   (detachable devices only).   Return 0 on success.   */int __init cs89x0_probe(struct net_device *dev){	int i;	int base_addr = dev ? dev->base_addr : 0;	SET_MODULE_OWNER(dev);	if (net_debug)		printk("cs89x0:cs89x0_probe(0x%x)\n", base_addr);	if (base_addr > 0x1ff)		/* Check a single specified location. */		return cs89x0_probe1(dev, base_addr);	else if (base_addr != 0)	/* Don't probe at all. */		return -ENXIO;	for (i = 0; netcard_portlist[i]; i++) {		if (cs89x0_probe1(dev, netcard_portlist[i]) == 0)			return 0;	}	printk(KERN_WARNING "cs89x0: no cs8900 or cs8920 detected.  Be sure to disable PnP with SETUP\n");	return -ENODEV;}static intreadreg(struct net_device *dev, int portno){	outw(portno, dev->base_addr + ADD_PORT);	return inw(dev->base_addr + DATA_PORT);}static voidwritereg(struct net_device *dev, int portno, int value){	outw(portno, dev->base_addr + ADD_PORT);	outw(value, dev->base_addr + DATA_PORT);}static intreadword(struct net_device *dev, int portno){	return inw(dev->base_addr + portno);}static voidwriteword(struct net_device *dev, int portno, int value){	outw(value, dev->base_addr + portno);}static int __initwait_eeprom_ready(struct net_device *dev){	int timeout = jiffies;	/* check to see if the EEPROM is ready, a timeout is used -	   just in case EEPROM is ready when SI_BUSY in the	   PP_SelfST is clear */	while(readreg(dev, PP_SelfST) & SI_BUSY)		if (jiffies - timeout >= 40)			return -1;	return 0;}static int __initget_eeprom_data(struct net_device *dev, int off, int len, int *buffer){	int i;	if (net_debug > 3) printk("EEPROM data from %x for %x:\n",off,len);	for (i = 0; i < len; i++) {		if (wait_eeprom_ready(dev) < 0) return -1;		/* Now send the EEPROM read command and EEPROM location to read */		writereg(dev, PP_EECMD, (off + i) | EEPROM_READ_CMD);		if (wait_eeprom_ready(dev) < 0) return -1;		buffer[i] = readreg(dev, PP_EEData);		if (net_debug > 3) printk("%04x ", buffer[i]);	}	if (net_debug > 3) printk("\n");        return 0;}static int  __initget_eeprom_cksum(int off, int len, int *buffer){	int i, cksum;	cksum = 0;	for (i = 0; i < len; i++)		cksum += buffer[i];	cksum &= 0xffff;	if (cksum == 0)		return 0;	return -1;}/* This is the real probe routine.  Linux has a history of friendly device   probes on the ISA bus.  A good device probes avoids doing writes, and   verifies that the correct device exists and functions.   Return 0 on success. */static int __initcs89x0_probe1(struct net_device *dev, int ioaddr){	struct net_local *lp;	static unsigned version_printed;	int i;	unsigned rev_type = 0;	int eeprom_buff[CHKSUM_LEN];	int retval;	/* Initialize the device structure. */	if (dev->priv == NULL) {		dev->priv = kmalloc(sizeof(struct net_local), GFP_KERNEL);		if (dev->priv == 0) {			retval = -ENOMEM;			goto out;		}		lp = (struct net_local *)dev->priv;		memset(lp, 0, sizeof(*lp));		spin_lock_init(&lp->lock);#if !defined(MODULE) && (ALLOW_DMA != 0)		if (g_cs89x0_dma) {			lp->use_dma = 1;			lp->dma = g_cs89x0_dma;			lp->dmasize = 16;	/* Could make this an option... */		}#endif        }	lp = (struct net_local *)dev->priv;	/* Grab the region so we can find another board if autoIRQ fails. */	if (!request_region(ioaddr & ~3, NETCARD_IO_EXTENT, dev->name)) {		printk(KERN_ERR "%s: request_region(0x%x, 0x%x) failed\n",				dev->name, ioaddr, NETCARD_IO_EXTENT);		retval = -EBUSY;		goto out1;	}	/* if they give us an odd I/O address, then do ONE write to           the address port, to get it back to address zero, where we           expect to find the EISA signature word. An IO with a base of 0x3 	   will skip the test for the ADD_PORT. */	if (ioaddr & 1) {		if (net_debug > 1)			printk(KERN_INFO "%s: odd ioaddr 0x%x\n", dev->name, ioaddr); 	        if ((ioaddr & 2) != 2)	        	if ((inw((ioaddr & ~3)+ ADD_PORT) & ADD_MASK) != ADD_SIG) {				printk(KERN_ERR "%s: bad signature 0x%x\n",					dev->name, inw((ioaddr & ~3)+ ADD_PORT));		        	retval = -ENODEV;				goto out2;			} 		ioaddr &= ~3;		outw(PP_ChipID, ioaddr + ADD_PORT);	}printk("PP_addr=0x%x\n", inw(ioaddr + ADD_PORT));        if (inw(ioaddr + DATA_PORT) != CHIP_EISA_ID_SIG) {		printk(KERN_ERR "%s: incorrect signature 0x%x\n",			dev->name, inw(ioaddr + DATA_PORT));		retval = -ENODEV;  		goto out2;	}	/* Fill in the 'dev' fields. */	dev->base_addr = ioaddr;	/* get the chip type */	rev_type = readreg(dev, PRODUCT_ID_ADD);	lp->chip_type = rev_type &~ REVISON_BITS;	lp->chip_revision = ((rev_type & REVISON_BITS) >> 8) + 'A';	/* Check the chip type and revision in order to set the correct send command	CS8920 revision C and CS8900 revision F can use the faster send. */	lp->send_cmd = TX_AFTER_381;	if (lp->chip_type == CS8900 && lp->chip_revision >= 'F')		lp->send_cmd = TX_NOW;	if (lp->chip_type != CS8900 && lp->chip_revision >= 'C')		lp->send_cmd = TX_NOW;	if (net_debug  &&  version_printed++ == 0)