madgemc.c

h内核

/*
 *  madgemc.c: Driver for the Madge Smart 16/4 MC16 MCA token ring card.
 *
 *  Written 2000 by Adam Fritzler
 *
 *  This software may be used and distributed according to the terms
 *  of the GNU General Public License, incorporated herein by reference.
 *
 *  This driver module supports the following cards:
 *      - Madge Smart 16/4 Ringnode MC16
 *	- Madge Smart 16/4 Ringnode MC32 (??)
 *
 *  Maintainer(s):
 *    AF	Adam Fritzler		[e-mail]
 *
 *  Modification History:
 *	16-Jan-00	AF	Created
 *
 */
static const char version[] = "madgemc.c: v0.91 23/01/2000 by Adam Fritzler\n";

#include <linux/module.h>
#include <linux/mca-legacy.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/trdevice.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>

#include "tms380tr.h"
#include "madgemc.h"            /* Madge-specific constants */

#define MADGEMC_IO_EXTENT 32
#define MADGEMC_SIF_OFFSET 0x08

struct madgemc_card {
	struct net_device *dev;

	/*
	 * These are read from the BIA ROM.
	 */
	unsigned int manid;
	unsigned int cardtype;
	unsigned int cardrev;
	unsigned int ramsize;
	
	/*
	 * These are read from the MCA POS registers.  
	 */
	unsigned int burstmode:2;
	unsigned int fairness:1; /* 0 = Fair, 1 = Unfair */
	unsigned int arblevel:4;
	unsigned int ringspeed:2; /* 0 = 4mb, 1 = 16, 2 = Auto/none */
	unsigned int cabletype:1; /* 0 = RJ45, 1 = DB9 */

	struct madgemc_card *next;
};
static struct madgemc_card *madgemc_card_list;


static int madgemc_open(struct net_device *dev);
static int madgemc_close(struct net_device *dev);
static int madgemc_chipset_init(struct net_device *dev);
static void madgemc_read_rom(struct madgemc_card *card);
static unsigned short madgemc_setnselout_pins(struct net_device *dev);
static void madgemc_setcabletype(struct net_device *dev, int type);

static int madgemc_mcaproc(char *buf, int slot, void *d);

static void madgemc_setregpage(struct net_device *dev, int page);
static void madgemc_setsifsel(struct net_device *dev, int val);
static void madgemc_setint(struct net_device *dev, int val);

static irqreturn_t madgemc_interrupt(int irq, void *dev_id, struct pt_regs *regs);

/*
 * These work around paging, however they don't guarentee you're on the
 * right page.
 */
#define SIFREADB(reg) (inb(dev->base_addr + ((reg<0x8)?reg:reg-0x8)))
#define SIFWRITEB(val, reg) (outb(val, dev->base_addr + ((reg<0x8)?reg:reg-0x8)))
#define SIFREADW(reg) (inw(dev->base_addr + ((reg<0x8)?reg:reg-0x8)))
#define SIFWRITEW(val, reg) (outw(val, dev->base_addr + ((reg<0x8)?reg:reg-0x8)))

/*
 * Read a byte-length value from the register.
 */
static unsigned short madgemc_sifreadb(struct net_device *dev, unsigned short reg)
{
	unsigned short ret;
	if (reg<0x8)	
		ret = SIFREADB(reg);
	else {
		madgemc_setregpage(dev, 1);	
		ret = SIFREADB(reg);
		madgemc_setregpage(dev, 0);
	}
	return ret;
}

/*
 * Write a byte-length value to a register.
 */
static void madgemc_sifwriteb(struct net_device *dev, unsigned short val, unsigned short reg)
{
	if (reg<0x8)
		SIFWRITEB(val, reg);
	else {
		madgemc_setregpage(dev, 1);
		SIFWRITEB(val, reg);
		madgemc_setregpage(dev, 0);
	}
	return;
}

/*
 * Read a word-length value from a register
 */
static unsigned short madgemc_sifreadw(struct net_device *dev, unsigned short reg)
{
	unsigned short ret;
	if (reg<0x8)	
		ret = SIFREADW(reg);
	else {
		madgemc_setregpage(dev, 1);	
		ret = SIFREADW(reg);
		madgemc_setregpage(dev, 0);
	}
	return ret;
}

/*
 * Write a word-length value to a register.
 */
static void madgemc_sifwritew(struct net_device *dev, unsigned short val, unsigned short reg)
{
	if (reg<0x8)
		SIFWRITEW(val, reg);
	else {
		madgemc_setregpage(dev, 1);
		SIFWRITEW(val, reg);
		madgemc_setregpage(dev, 0);
	}
	return;
}



static int __init madgemc_probe(void)
{	
	static int versionprinted;
	struct net_device *dev;
	struct net_local *tp;
	struct madgemc_card *card;
	int i,slot = 0;
	__u8 posreg[4];

	if (!MCA_bus)
		return -1;	
 
	while (slot != MCA_NOTFOUND) {
		/*
		 * Currently we only support the MC16/32 (MCA ID 002d)
		 */
		slot = mca_find_unused_adapter(0x002d, slot);
		if (slot == MCA_NOTFOUND)
			break;

		/*
		 * If we get here, we have an adapter.
		 */
		if (versionprinted++ == 0)
			printk("%s", version);

		dev = alloc_trdev(sizeof(struct net_local));
		if (dev == NULL) {
			printk("madgemc: unable to allocate dev space\n");
			if (madgemc_card_list)
				return 0;
			return -1;
		}

		SET_MODULE_OWNER(dev);
		dev->dma = 0;

		/*
		 * Fetch MCA config registers
		 */
		for(i=0;i<4;i++)
			posreg[i] = mca_read_stored_pos(slot, i+2);
		
		card = kmalloc(sizeof(struct madgemc_card), GFP_KERNEL);
		if (card==NULL) {
			printk("madgemc: unable to allocate card struct\n");
			free_netdev(dev);
			if (madgemc_card_list)
				return 0;
			return -1;
		}
		card->dev = dev;

		/*
		 * Parse configuration information.  This all comes
		 * directly from the publicly available @002d.ADF.
		 * Get it from Madge or your local ADF library.
		 */

		/*
		 * Base address 
		 */
		dev->base_addr = 0x0a20 + 
			((posreg[2] & MC16_POS2_ADDR2)?0x0400:0) +
			((posreg[0] & MC16_POS0_ADDR1)?0x1000:0) +
			((posreg[3] & MC16_POS3_ADDR3)?0x2000:0);

		/*
		 * Interrupt line
		 */
		switch(posreg[0] >> 6) { /* upper two bits */
		case 0x1: dev->irq = 3; break;
		case 0x2: dev->irq = 9; break; /* IRQ 2 = IRQ 9 */
		case 0x3: dev->irq = 10; break;
		default: dev->irq = 0; break;
		}

		if (dev->irq == 0) {
			printk("%s: invalid IRQ\n", dev->name);
			goto getout1;
		}

		if (!request_region(dev->base_addr, MADGEMC_IO_EXTENT, 
				   "madgemc")) {
			printk(KERN_INFO "madgemc: unable to setup Smart MC in slot %d because of I/O base conflict at 0x%04lx\n", slot, dev->base_addr);
			dev->base_addr += MADGEMC_SIF_OFFSET;
			goto getout1;
		}
		dev->base_addr += MADGEMC_SIF_OFFSET;
		
		/*
		 * Arbitration Level
		 */
		card->arblevel = ((posreg[0] >> 1) & 0x7) + 8;

		/*
		 * Burst mode and Fairness
		 */
		card->burstmode = ((posreg[2] >> 6) & 0x3);
		card->fairness = ((posreg[2] >> 4) & 0x1);

		/*
		 * Ring Speed
		 */
		if ((posreg[1] >> 2)&0x1)
			card->ringspeed = 2; /* not selected */
		else if ((posreg[2] >> 5) & 0x1)
			card->ringspeed = 1; /* 16Mb */
		else
			card->ringspeed = 0; /* 4Mb */

		/* 
		 * Cable type
		 */
		if ((posreg[1] >> 6)&0x1)
			card->cabletype = 1; /* STP/DB9 */
		else
			card->cabletype = 0; /* UTP/RJ-45 */


		/* 
		 * ROM Info. This requires us to actually twiddle
		 * bits on the card, so we must ensure above that 
		 * the base address is free of conflict (request_region above).
		 */
		madgemc_read_rom(card);
		
		if (card->manid != 0x4d) { /* something went wrong */
			printk(KERN_INFO "%s: Madge MC ROM read failed (unknown manufacturer ID %02x)\n", dev->name, card->manid);
			goto getout;
		}
		
		if ((card->cardtype != 0x08) && (card->cardtype != 0x0d)) {
			printk(KERN_INFO "%s: Madge MC ROM read failed (unknown card ID %02x)\n", dev->name, card->cardtype);
			goto getout;
		}
	       
		/* All cards except Rev 0 and 1 MC16's have 256kb of RAM */
		if ((card->cardtype == 0x08) && (card->cardrev <= 0x01))
			card->ramsize = 128;
		else
			card->ramsize = 256;

		printk("%s: %s Rev %d at 0x%04lx IRQ %d\n", 
		       dev->name, 
		       (card->cardtype == 0x08)?MADGEMC16_CARDNAME:
		       MADGEMC32_CARDNAME, card->cardrev, 
		       dev->base_addr, dev->irq);

		if (card->cardtype == 0x0d)
			printk("%s:     Warning: MC32 support is experimental and highly untested\n", dev->name);
		
		if (card->ringspeed==2) { /* Unknown */
			printk("%s:     Warning: Ring speed not set in POS -- Please run the reference disk and set it!\n", dev->name);
			card->ringspeed = 1; /* default to 16mb */
		}
		
		printk("%s:     RAM Size: %dKB\n", dev->name, card->ramsize);

		printk("%s:     Ring Speed: %dMb/sec on %s\n", dev->name, 
		       (card->ringspeed)?16:4, 
		       card->cabletype?"STP/DB9":"UTP/RJ-45");
		printk("%s:     Arbitration Level: %d\n", dev->name, 
		       card->arblevel);

		printk("%s:     Burst Mode: ", dev->name);
		switch(card->burstmode) {
		case 0: printk("Cycle steal"); break;
		case 1: printk("Limited burst"); break;
		case 2: printk("Delayed release"); break;
		case 3: printk("Immediate release"); break;
		}
		printk(" (%s)\n", (card->fairness)?"Unfair":"Fair");


		/* 
		 * Enable SIF before we assign the interrupt handler,
		 * just in case we get spurious interrupts that need
		 * handling.
		 */ 
		outb(0, dev->base_addr + MC_CONTROL_REG0); /* sanity */
		madgemc_setsifsel(dev, 1);
		if (request_irq(dev->irq, madgemc_interrupt, SA_SHIRQ,
			       "madgemc", dev)) 
			goto getout;
		
		madgemc_chipset_init(dev); /* enables interrupts! */
		madgemc_setcabletype(dev, card->cabletype);

		/* Setup MCA structures */
		mca_set_adapter_name(slot, (card->cardtype == 0x08)?MADGEMC16_CARDNAME:MADGEMC32_CARDNAME);
		mca_set_adapter_procfn(slot, madgemc_mcaproc, dev);
		mca_mark_as_used(slot);

		printk("%s:     Ring Station Address: ", dev->name);
		printk("%2.2x", dev->dev_addr[0]);
		for (i = 1; i < 6; i++)
			printk(":%2.2x", dev->dev_addr[i]);
		printk("\n");

		/* XXX is ISA_MAX_ADDRESS correct here? */
		if (tmsdev_init(dev, ISA_MAX_ADDRESS, NULL)) {
			printk("%s: unable to get memory for dev->priv.\n", 
			       dev->name);
			release_region(dev->base_addr-MADGEMC_SIF_OFFSET, 
			       MADGEMC_IO_EXTENT); 
			
			kfree(card);
			tmsdev_term(dev);
			free_netdev(dev);
			if (madgemc_card_list)
				return 0;
			return -1;
		}
		tp = netdev_priv(dev);

		/* 
		 * The MC16 is physically a 32bit card.  However, Madge
		 * insists on calling it 16bit, so I'll assume here that
		 * they know what they're talking about.  Cut off DMA
		 * at 16mb.
		 */
		tp->setnselout = madgemc_setnselout_pins;
		tp->sifwriteb = madgemc_sifwriteb;
		tp->sifreadb = madgemc_sifreadb;
		tp->sifwritew = madgemc_sifwritew;
		tp->sifreadw = madgemc_sifreadw;
		tp->DataRate = (card->ringspeed)?SPEED_16:SPEED_4;

		memcpy(tp->ProductID, "Madge MCA 16/4    ", PROD_ID_SIZE + 1);

		dev->open = madgemc_open;
		dev->stop = madgemc_close;

		if (register_netdev(dev) == 0) {
			/* Enlist in the card list */
			card->next = madgemc_card_list;
			madgemc_card_list = card;
			slot++;
			continue; /* successful, try to find another */
		}
		
		free_irq(dev->irq, dev);
	getout:
		release_region(dev->base_addr-MADGEMC_SIF_OFFSET, 
			       MADGEMC_IO_EXTENT); 
	getout1:
		kfree(card);