skfddi.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

/*
 * File Name:
 *   skfddi.c
 *
 * Copyright Information:
 *   Copyright SysKonnect 1998,1999.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * The information in this file is provided "AS IS" without warranty.
 *
 * Abstract:
 *   A Linux device driver supporting the SysKonnect FDDI PCI controller
 *   familie.
 *
 * Maintainers:
 *   CG    Christoph Goos ([e-mail])
 *
 * Contributors:
 *   DM    David S. Miller
 *
 * Address all question to:
 *   [e-mail]
 *
 * The technical manual for the adapters is available from SysKonnect's
 * web pages: www.syskonnect.com
 * Goto "Support" and search Knowledge Base for "manual".
 *
 * Driver Architecture:
 *   The driver architecture is based on the DEC FDDI driver by
 *   Lawrence V. Stefani and several ethernet drivers.
 *   I also used an existing Windows NT miniport driver.
 *   All hardware dependant fuctions are handled by the SysKonnect
 *   Hardware Module.
 *   The only headerfiles that are directly related to this source
 *   are skfddi.c, h/types.h, h/osdef1st.h, h/targetos.h.
 *   The others belong to the SysKonnect FDDI Hardware Module and
 *   should better not be changed.
 * NOTE:
 *   Compiling this driver produces some warnings, but I did not fix
 *   this, because the Hardware Module source is used for different
 *   drivers, and fixing it for Linux might bring problems on other
 *   projects. To keep the source common for all those drivers (and
 *   thus simplify fixes to it), please do not clean it up!
 *
 * Modification History:
 *              Date            Name    Description
 *              02-Mar-98       CG	Created.
 *
 *		10-Mar-99	CG	Support for 2.2.x added.
 *		25-Mar-99	CG	Corrected IRQ routing for SMP (APIC)
 *		26-Oct-99	CG	Fixed compilation error on 2.2.13
 *		12-Nov-99	CG	Source code release
 *		22-Nov-99	CG	Included in kernel source.
 *		07-May-00	DM	64 bit fixes, new dma interface
 *
 * Compilation options (-Dxxx):
 *              DRIVERDEBUG     print lots of messages to log file
 *              DUMPPACKETS     print received/transmitted packets to logfile
 * 
 * Tested cpu architectures:
 *	- i386
 *	- sparc64
 */

/* Version information string - should be updated prior to */
/* each new release!!! */
#define VERSION		"2.06"

static const char *boot_msg = 
	"SysKonnect FDDI PCI Adapter driver v" VERSION " for\n"
	"  SK-55xx/SK-58xx adapters (SK-NET FDDI-FP/UP/LP)";

/* Include files */

#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/sched.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/pci.h>
#include <linux/delay.h>
#include <asm/byteorder.h>
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/ctype.h>	// isdigit

#include <linux/netdevice.h>
#include <linux/fddidevice.h>
#include <linux/skbuff.h>

#include	"h/types.h"
#undef ADDR			// undo Linux definition
#include	"h/skfbi.h"
#include	"h/fddi.h"
#include	"h/smc.h"
#include	"h/smtstate.h"


// Define global routines
int skfp_probe(struct net_device *dev);


// Define module-wide (static) routines
static struct net_device *alloc_device(struct net_device *dev, u_long iobase);
static struct net_device *insert_device(struct net_device *dev,
				    int (*init) (struct net_device *));
static int fddi_dev_index(unsigned char *s);
static void init_dev(struct net_device *dev, u_long iobase);
static void link_modules(struct net_device *dev, struct net_device *tmp);
static int skfp_driver_init(struct net_device *dev);
static int skfp_open(struct net_device *dev);
static int skfp_close(struct net_device *dev);
static void skfp_interrupt(int irq, void *dev_id, struct pt_regs *regs);
static struct net_device_stats *skfp_ctl_get_stats(struct net_device *dev);
static void skfp_ctl_set_multicast_list(struct net_device *dev);
static void skfp_ctl_set_multicast_list_wo_lock(struct net_device *dev);
static int skfp_ctl_set_mac_address(struct net_device *dev, void *addr);
static int skfp_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
static int skfp_send_pkt(struct sk_buff *skb, struct net_device *dev);
static void send_queued_packets(struct s_smc *smc);
static void CheckSourceAddress(unsigned char *frame, unsigned char *hw_addr);
static void ResetAdapter(struct s_smc *smc);


// Functions needed by the hardware module
void *mac_drv_get_space(struct s_smc *smc, u_int size);
void *mac_drv_get_desc_mem(struct s_smc *smc, u_int size);
unsigned long mac_drv_virt2phys(struct s_smc *smc, void *virt);
unsigned long dma_master(struct s_smc *smc, void *virt, int len, int flag);
void dma_complete(struct s_smc *smc, volatile union s_fp_descr *descr,
		  int flag);
void mac_drv_tx_complete(struct s_smc *smc, volatile struct s_smt_fp_txd *txd);
void llc_restart_tx(struct s_smc *smc);
void mac_drv_rx_complete(struct s_smc *smc, volatile struct s_smt_fp_rxd *rxd,
			 int frag_count, int len);
void mac_drv_requeue_rxd(struct s_smc *smc, volatile struct s_smt_fp_rxd *rxd,
			 int frag_count);
void mac_drv_fill_rxd(struct s_smc *smc);
void mac_drv_clear_rxd(struct s_smc *smc, volatile struct s_smt_fp_rxd *rxd,
		       int frag_count);
int mac_drv_rx_init(struct s_smc *smc, int len, int fc, char *look_ahead,
		    int la_len);
void smt_timer_poll(struct s_smc *smc);
void ring_status_indication(struct s_smc *smc, u_long status);
unsigned long smt_get_time(void);
void smt_stat_counter(struct s_smc *smc, int stat);
void cfm_state_change(struct s_smc *smc, int c_state);
void ecm_state_change(struct s_smc *smc, int e_state);
void pcm_state_change(struct s_smc *smc, int plc, int p_state);
void rmt_state_change(struct s_smc *smc, int r_state);
void drv_reset_indication(struct s_smc *smc);
void dump_data(unsigned char *Data, int length);


// External functions from the hardware module
extern u_int mac_drv_check_space();
extern void read_address(struct s_smc *smc, u_char * mac_addr);
extern void card_stop(struct s_smc *smc);
extern int mac_drv_init(struct s_smc *smc);
extern void hwm_tx_frag(struct s_smc *smc, char far * virt, u_long phys,
			int len, int frame_status);
extern int hwm_tx_init(struct s_smc *smc, u_char fc, int frag_count,
		       int frame_len, int frame_status);
extern int init_smt(struct s_smc *smc, u_char * mac_addr);
extern void fddi_isr(struct s_smc *smc);
extern void hwm_rx_frag(struct s_smc *smc, char far * virt, u_long phys,
			int len, int frame_status);
extern void mac_drv_rx_mode(struct s_smc *smc, int mode);
extern void mac_drv_clear_tx_queue(struct s_smc *smc);
extern void mac_drv_clear_rx_queue(struct s_smc *smc);
extern void mac_clear_multicast(struct s_smc *smc);
extern void enable_tx_irq(struct s_smc *smc, u_short queue);
extern void mac_drv_clear_txd(struct s_smc *smc);

static struct pci_device_id skfddi_pci_tbl[] __initdata = {
	{ PCI_VENDOR_ID_SK, PCI_DEVICE_ID_SK_FP, PCI_ANY_ID, PCI_ANY_ID, },
	{ }			/* Terminating entry */
};
MODULE_DEVICE_TABLE(pci, skfddi_pci_tbl);
MODULE_LICENSE("GPL");

// Define module-wide (static) variables

static int num_boards;	/* total number of adapters configured */
static int num_fddi;
static int autoprobed;

#ifdef MODULE
int init_module(void);
void cleanup_module(void);
static struct net_device *unlink_modules(struct net_device *p);
static int loading_module = 1;
#else
static int loading_module;
#endif				// MODULE

#ifdef DRIVERDEBUG
#define PRINTK(s, args...) printk(s, ## args)
#else
#define PRINTK(s, args...)
#endif				// DRIVERDEBUG

#define PRIV(dev) (&(((struct s_smc *)dev->priv)->os))

/*
 * ==============
 * = skfp_probe =
 * ==============
 *   
 * Overview:
 *   Probes for supported FDDI PCI controllers
 *  
 * Returns:
 *   Condition code
 *       
 * Arguments:
 *   dev - pointer to device information
 *
 * Functional Description:
 *   This routine is called by the OS for each FDDI device name (fddi0,
 *   fddi1,...,fddi6, fddi7) specified in drivers/net/Space.c.
 *   If loaded as a module, it will detect and initialize all 
 *   adapters the first time it is called.
 *
 *   Let's say that skfp_probe() is getting called to initialize fddi0.
 *   Furthermore, let's say there are three supported controllers in the
 *   system.  Before skfp_probe() leaves, devices fddi0, fddi1, and fddi2
 *   will be initialized and a global flag will be set to indicate that
 *   skfp_probe() has already been called.
 *
 *   However...the OS doesn't know that we've already initialized
 *   devices fddi1 and fddi2 so skfp_probe() gets called again and again
 *   until it reaches the end of the device list for FDDI (presently,
 *   fddi7).  It's important that the driver "pretend" to probe for
 *   devices fddi1 and fddi2 and return success.  Devices fddi3
 *   through fddi7 will return failure since they weren't initialized.
 *
 *   This algorithm seems to work for the time being.  As other FDDI
 *   drivers are written for Linux, a more generic approach (perhaps
 *   similar to the Ethernet card approach) may need to be implemented.
 *   
 * Return Codes:
 *   0           - This device (fddi0, fddi1, etc) configured successfully
 *   -ENODEV - No devices present, or no SysKonnect FDDI PCI device
 *                         present for this device name
 *
 *
 * Side Effects:
 *   Device structures for FDDI adapters (fddi0, fddi1, etc) are
 *   initialized and the board resources are read and stored in
 *   the device structure.
 */
int skfp_probe(struct net_device *dev)
{
	int i;			/* used in for loops */
	struct pci_dev *pdev = NULL;	/* PCI device structure */
#ifndef MEM_MAPPED_IO
	u16 port;		/* temporary I/O (port) address */
	int port_len;		/* length of port address range (in bytes) */
#else
	unsigned long port;
#endif
	u16 command;	/* PCI Configuration space Command register val */
	struct s_smc *smc;	/* board pointer */
	struct net_device *tmp = dev;
	u8 first_dev_used = 0;
	u16 SubSysId;

	PRINTK(KERN_INFO "entering skfp_probe\n");

	/*
	 * Verify whether we're going through skfp_probe() again
	 *
	 * If so, see if we're going through for a subsequent fddi device that
	 * we've already initialized.  If we are, return success (0).  If not,
	 * return failure (-ENODEV).
	 */

	if (autoprobed) {
		PRINTK(KERN_INFO "Already entered skfp_probe\n");
		if (dev != NULL) {
			if ((strncmp(dev->name, "fddi", 4) == 0) &&
			    (dev->base_addr != 0)) {
				return (0);
			}
			return (-ENODEV);
		}
	}
	autoprobed = 1;		/* set global flag */

	printk("%s\n", boot_msg);

	/* Scan for Syskonnect FDDI PCI controllers */
	if (!pci_present()) {	/* is PCI BIOS even present? */
		printk("no PCI BIOS present\n");
		return (-ENODEV);
	}
	for (i = 0; i < SKFP_MAX_NUM_BOARDS; i++) {	// scan for PCI cards
		PRINTK(KERN_INFO "Check device %d\n", i);
		if ((pdev=pci_find_device(PCI_VENDOR_ID_SK, PCI_DEVICE_ID_SK_FP,
			pdev)) == 0) {
			break;
		}
		if (pci_enable_device(pdev))
			continue;

#ifndef MEM_MAPPED_IO
		/* Verify that I/O enable bit is set (PCI slot is enabled) */
		pci_read_config_word(pdev, PCI_COMMAND, &command);
		if ((command & PCI_COMMAND_IO) == 0) {
			PRINTK("I/O enable bit not set!");
			PRINTK(" Verify that slot is enabled\n");
			continue;
		}

		/* Turn off memory mapped space and enable mastering */

		PRINTK(KERN_INFO "Command Reg: %04x\n", command);
		command |= PCI_COMMAND_MASTER;
		command &= ~PCI_COMMAND_MEMORY;
		pci_write_config_word(pdev, PCI_COMMAND, command);

		/* Read I/O base address from PCI Configuration Space */

		pci_read_config_word(pdev, PCI_BASE_ADDRESS_1, &port);
		port &= PCI_BASE_ADDRESS_IO_MASK; // clear I/O bit (bit 0)

		/* Verify port address range is not already being used */

		port_len = FP_IO_LEN;
		if (check_region(port, port_len) != 0) {
			printk("I/O range allocated to adapter");
			printk(" (0x%X-0x%X) is already being used!\n", port,
			       (port + port_len - 1));
			continue;
		}
#else
		/* Verify that MEM enable bit is set (PCI slot is enabled) */
		pci_read_config_word(pdev, PCI_COMMAND, &command);
		if ((command & PCI_COMMAND_MEMORY) == 0) {
			PRINTK("MEMORY-I/O enable bit not set!");
			PRINTK(" Verify that slot is enabled\n");
			continue;
		}

		/* Turn off IO mapped space and enable mastering */

		PRINTK(KERN_INFO "Command Reg: %04x\n", command);
		command |= PCI_COMMAND_MASTER;
		command &= ~PCI_COMMAND_IO;
		pci_write_config_word(pdev, PCI_COMMAND, command);

		port = pci_resource_start(pdev, 0);

		port = (unsigned long)ioremap(port, 0x4000);
		if (!port){
			printk("skfp:  Unable to map MEMORY register, "
			"FDDI adapter will be disabled.\n");
			break;
		}
#endif

		if ((!loading_module) || first_dev_used) {
			/* Allocate a device structure for this adapter */
			tmp = alloc_device(dev, port);
		}
		first_dev_used = 1;	// only significant first time

		pci_read_config_word(pdev, PCI_SUBSYSTEM_ID, &SubSysId);

		if (tmp != NULL) {
			if (loading_module)
				link_modules(dev, tmp);
			dev = tmp;
			init_dev(dev, port);
			dev->irq = pdev->irq;

			/* Initialize board structure with bus-specific info */

			smc = (struct s_smc *) dev->priv;
			smc->os.dev = dev;
			smc->os.bus_type = SK_BUS_TYPE_PCI;
			smc->os.pdev = *pdev;
			smc->os.QueueSkb = MAX_TX_QUEUE_LEN;
			smc->os.MaxFrameSize = MAX_FRAME_SIZE;
			smc->os.dev = dev;
			smc->hw.slot = -1;
			smc->os.ResetRequested = FALSE;
			skb_queue_head_init(&smc->os.SendSkbQueue);

			if (skfp_driver_init(dev) == 0) {
				// only increment global board 
				// count on success
				num_boards++;
				request_region(dev->base_addr,
					       FP_IO_LEN, dev->name);
				if ((SubSysId & 0xff00) == 0x5500 ||
					(SubSysId & 0xff00) == 0x5800) {
				printk("%s: SysKonnect FDDI PCI adapter"
				       " found (SK-%04X)\n", dev->name,
					SubSysId);
				} else {
				printk("%s: FDDI PCI adapter found\n",
					dev->name);
				}
			} else {
				kfree(dev);
				i = SKFP_MAX_NUM_BOARDS;	// stop search

			}

		}		// if (dev != NULL)

	}			// for SKFP_MAX_NUM_BOARDS