parport_pc.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 2,460 行 · 第 1/5 页

	/* Set up ECP FIFO mode.*/
/*	parport_pc_frob_control (port,
				 PARPORT_CONTROL_STROBE |
				 PARPORT_CONTROL_AUTOFD,
				 PARPORT_CONTROL_AUTOFD); */
	r = change_mode (port, ECR_ECP); /* ECP FIFO */
	if (r) printk (KERN_DEBUG "%s: Warning change_mode ECR_ECP failed\n", port->name);

	port->ieee1284.phase = IEEE1284_PH_REV_DATA;

	/* the first byte must be collected manually */
dump_parport_state ("pre 43", port);
	/* Event 43: Wait for nAck to go low */
	r = parport_wait_peripheral (port, PARPORT_STATUS_ACK, 0);
	if (r) {
		/* timed out while reading -- no data */
		printk (KERN_DEBUG "PIO read timed out (initial byte)\n");
		goto out_no_data;
	}
	/* read byte */
	*bufp++ = inb (DATA (port));
	left--;
dump_parport_state ("43-44", port);
	/* Event 44: nAutoFd (HostAck) goes high to acknowledge */
	parport_pc_frob_control (port,
				 PARPORT_CONTROL_AUTOFD,
				 0);
dump_parport_state ("pre 45", port);
	/* Event 45: Wait for nAck to go high */
/*	r = parport_wait_peripheral (port, PARPORT_STATUS_ACK, PARPORT_STATUS_ACK); */
dump_parport_state ("post 45", port);
r = 0;
	if (r) {
		/* timed out while waiting for peripheral to respond to ack */
		printk (KERN_DEBUG "ECP PIO read timed out (waiting for nAck)\n");

		/* keep hold of the byte we've got already */
		goto out_no_data;
	}
	/* Event 46: nAutoFd (HostAck) goes low to accept more data */
	parport_pc_frob_control (port,
				 PARPORT_CONTROL_AUTOFD,
				 PARPORT_CONTROL_AUTOFD);


dump_parport_state ("rev idle", port);
	/* Do the transfer. */
	while (left > fifofull) {
		int ret;
		unsigned long expire = jiffies + port->cad->timeout;
		unsigned char ecrval = inb (ECONTROL (port));

		if (need_resched() && time_before (jiffies, expire))
			/* Can't yield the port. */
			schedule ();

		/* At this point, the FIFO may already be full. In
                 * that case ECP is already holding back the
                 * peripheral (assuming proper design) with a delayed
                 * handshake.  Work fast to avoid a peripheral
                 * timeout.  */

		if (ecrval & 0x01) {
			/* FIFO is empty. Wait for interrupt. */
dump_parport_state ("FIFO empty", port);

			/* Anyone else waiting for the port? */
			if (port->waithead) {
				printk (KERN_DEBUG "Somebody wants the port\n");
				break;
			}

			/* Clear serviceIntr */
			ECR_WRITE (port, ecrval & ~(1<<2));
		false_alarm:
dump_parport_state ("waiting", port);
			ret = parport_wait_event (port, HZ);
DPRINTK (KERN_DEBUG "parport_wait_event returned %d\n", ret);
			if (ret < 0)
				break;
			ret = 0;
			if (!time_before (jiffies, expire)) {
				/* Timed out. */
dump_parport_state ("timeout", port);
				printk (KERN_DEBUG "PIO read timed out\n");
				break;
			}
			ecrval = inb (ECONTROL (port));
			if (!(ecrval & (1<<2))) {
				if (need_resched() &&
				    time_before (jiffies, expire)) {
					schedule ();
				}
				goto false_alarm;
			}

			/* Depending on how the FIFO threshold was
                         * set, how long interrupt service took, and
                         * how fast the peripheral is, we might be
                         * lucky and have a just filled FIFO. */
			continue;
		}

		if (ecrval & 0x02) {
			/* FIFO is full. */
dump_parport_state ("FIFO full", port);
			insb (fifo, bufp, fifo_depth);
			bufp += fifo_depth;
			left -= fifo_depth;
			continue;
		}

DPRINTK (KERN_DEBUG "*** ecp_read_block_pio: reading one byte from the FIFO\n");

		/* FIFO not filled.  We will cycle this loop for a while
                 * and either the peripheral will fill it faster,
                 * tripping a fast empty with insb, or we empty it. */
		*bufp++ = inb (fifo);
		left--;
	}

	/* scoop up anything left in the FIFO */
	while (left && !(inb (ECONTROL (port) & 0x01))) {
		*bufp++ = inb (fifo);
		left--;
	}

	port->ieee1284.phase = IEEE1284_PH_REV_IDLE;
dump_parport_state ("rev idle2", port);

out_no_data:

	/* Go to forward idle mode to shut the peripheral up (event 47). */
	parport_frob_control (port, PARPORT_CONTROL_INIT, PARPORT_CONTROL_INIT);

	/* event 49: PError goes high */
	r = parport_wait_peripheral (port,
				     PARPORT_STATUS_PAPEROUT,
				     PARPORT_STATUS_PAPEROUT);
	if (r) {
		printk (KERN_DEBUG
			"%s: PE timeout FWDIDLE (%d) in ecp_read_block_pio\n",
			port->name, r);
	}

	port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;

	/* Finish up. */
	{
		int lost = get_fifo_residue (port);
		if (lost)
			/* Shouldn't happen with compliant peripherals. */
			printk (KERN_DEBUG "%s: DATA LOSS (%d bytes)!\n",
				port->name, lost);
	}

dump_parport_state ("fwd idle", port);
	return length - left;
}

#endif /* IEEE 1284 support */
#endif /* Allowed to use FIFO/DMA */


/*
 *	******************************************
 *	INITIALISATION AND MODULE STUFF BELOW HERE
 *	******************************************
 */

/* GCC is not inlining extern inline function later overwriten to non-inline,
   so we use outlined_ variants here.  */
struct parport_operations parport_pc_ops = 
{
	.write_data	= parport_pc_write_data,
	.read_data	= parport_pc_read_data,

	.write_control	= parport_pc_write_control,
	.read_control	= parport_pc_read_control,
	.frob_control	= parport_pc_frob_control,

	.read_status	= parport_pc_read_status,

	.enable_irq	= parport_pc_enable_irq,
	.disable_irq	= parport_pc_disable_irq,

	.data_forward	= parport_pc_data_forward,
	.data_reverse	= parport_pc_data_reverse,

	.init_state	= parport_pc_init_state,
	.save_state	= parport_pc_save_state,
	.restore_state	= parport_pc_restore_state,

	.epp_write_data	= parport_ieee1284_epp_write_data,
	.epp_read_data	= parport_ieee1284_epp_read_data,
	.epp_write_addr	= parport_ieee1284_epp_write_addr,
	.epp_read_addr	= parport_ieee1284_epp_read_addr,

	.ecp_write_data	= parport_ieee1284_ecp_write_data,
	.ecp_read_data	= parport_ieee1284_ecp_read_data,
	.ecp_write_addr	= parport_ieee1284_ecp_write_addr,

	.compat_write_data	= parport_ieee1284_write_compat,
	.nibble_read_data	= parport_ieee1284_read_nibble,
	.byte_read_data		= parport_ieee1284_read_byte,

	.owner		= THIS_MODULE,
};

#ifdef CONFIG_PARPORT_PC_SUPERIO
/* Super-IO chipset detection, Winbond, SMSC */
static int __devinit show_parconfig_smsc37c669(int io, int key)
{
	int cr1,cr4,cra,cr23,cr26,cr27,i=0;
	static const char *modes[]={ "SPP and Bidirectional (PS/2)",	
				     "EPP and SPP",
				     "ECP",
				     "ECP and EPP" };

	outb(key,io);
	outb(key,io);
	outb(1,io);
	cr1=inb(io+1);
	outb(4,io);
	cr4=inb(io+1);
	outb(0x0a,io);
	cra=inb(io+1);
	outb(0x23,io);
	cr23=inb(io+1);
	outb(0x26,io);
	cr26=inb(io+1);
	outb(0x27,io);
	cr27=inb(io+1);
	outb(0xaa,io);

	if (verbose_probing) {
		printk (KERN_INFO "SMSC 37c669 LPT Config: cr_1=0x%02x, 4=0x%02x, "
			"A=0x%2x, 23=0x%02x, 26=0x%02x, 27=0x%02x\n",
			cr1,cr4,cra,cr23,cr26,cr27);
		
		/* The documentation calls DMA and IRQ-Lines by letters, so
		   the board maker can/will wire them
		   appropriately/randomly...  G=reserved H=IDE-irq, */
		printk (KERN_INFO "SMSC LPT Config: io=0x%04x, irq=%c, dma=%c, "
			"fifo threshold=%d\n", cr23*4,
			(cr27 &0x0f) ? 'A'-1+(cr27 &0x0f): '-',
			(cr26 &0x0f) ? 'A'-1+(cr26 &0x0f): '-', cra & 0x0f);
		printk(KERN_INFO "SMSC LPT Config: enabled=%s power=%s\n",
		       (cr23*4 >=0x100) ?"yes":"no", (cr1 & 4) ? "yes" : "no");
		printk(KERN_INFO "SMSC LPT Config: Port mode=%s, EPP version =%s\n",
		       (cr1 & 0x08 ) ? "Standard mode only (SPP)" : modes[cr4 & 0x03], 
		       (cr4 & 0x40) ? "1.7" : "1.9");
	}
		
	/* Heuristics !  BIOS setup for this mainboard device limits
	   the choices to standard settings, i.e. io-address and IRQ
	   are related, however DMA can be 1 or 3, assume DMA_A=DMA1,
	   DMA_C=DMA3 (this is true e.g. for TYAN 1564D Tomcat IV) */
	if(cr23*4 >=0x100) { /* if active */
		while((superios[i].io!= 0) && (i<NR_SUPERIOS))
			i++;
		if(i==NR_SUPERIOS)
			printk(KERN_INFO "Super-IO: too many chips!\n");
		else {
			int d;
			switch (cr23*4) {
				case 0x3bc:
					superios[i].io = 0x3bc;
					superios[i].irq = 7;
					break;
				case 0x378:
					superios[i].io = 0x378;
					superios[i].irq = 7;
					break;
				case 0x278:
					superios[i].io = 0x278;
					superios[i].irq = 5;
			}
			if (io != superios[i].io) {
				/* how many bytes? */
				if (!request_region(superios[i].io, 3, "smsc parport")) {
					superios[i].io = 0;
					return 0;
				}
			}
			d=(cr26 &0x0f);
			if((d==1) || (d==3)) 
				superios[i].dma= d;
			else
				superios[i].dma= PARPORT_DMA_NONE;
			return 1;
		}
 	}
	return 0;
}


static int __devinit show_parconfig_winbond(int io, int key)
{
	int cr30,cr60,cr61,cr70,cr74,crf0,i=0;
	static const char *modes[] = {
		"Standard (SPP) and Bidirectional(PS/2)", /* 0 */
		"EPP-1.9 and SPP",
		"ECP",
		"ECP and EPP-1.9",
		"Standard (SPP)",
		"EPP-1.7 and SPP",		/* 5 */
		"undefined!",
		"ECP and EPP-1.7" };
	static char *irqtypes[] = { "pulsed low, high-Z", "follows nACK" };
		
	/* The registers are called compatible-PnP because the
           register layout is modelled after ISA-PnP, the access
           method is just another ... */
	outb(key,io);
	outb(key,io);
	outb(0x07,io);   /* Register 7: Select Logical Device */
	outb(0x01,io+1); /* LD1 is Parallel Port */
	outb(0x30,io);
	cr30=inb(io+1);
	outb(0x60,io);
	cr60=inb(io+1);
	outb(0x61,io);
	cr61=inb(io+1);
	outb(0x70,io);
	cr70=inb(io+1);
	outb(0x74,io);
	cr74=inb(io+1);
	outb(0xf0,io);
	crf0=inb(io+1);
	outb(0xaa,io);

	if (verbose_probing) {
		printk(KERN_INFO "Winbond LPT Config: cr_30=%02x 60,61=%02x%02x "
		       "70=%02x 74=%02x, f0=%02x\n", cr30,cr60,cr61,cr70,cr74,crf0);
		printk(KERN_INFO "Winbond LPT Config: active=%s, io=0x%02x%02x irq=%d, ", 
		       (cr30 & 0x01) ? "yes":"no", cr60,cr61,cr70&0x0f );
		if ((cr74 & 0x07) > 3)
			printk("dma=none\n");
		else
			printk("dma=%d\n",cr74 & 0x07);
		printk(KERN_INFO "Winbond LPT Config: irqtype=%s, ECP fifo threshold=%d\n",
		       irqtypes[crf0>>7], (crf0>>3)&0x0f);
		printk(KERN_INFO "Winbond LPT Config: Port mode=%s\n", modes[crf0 & 0x07]);
	}

	if(cr30 & 0x01) { /* the settings can be interrogated later ... */
		while((superios[i].io!= 0) && (i<NR_SUPERIOS))
			i++;
		if(i==NR_SUPERIOS) 
			printk(KERN_INFO "Super-IO: too many chips!\n");
		else {
			superios[i].io = (cr60<<8)|cr61;
			if (io != superios[i].io) {
				/* how many bytes? */
				if (!request_region(superios[i].io, 3, "winbond parport")) {
					superios[i].io = 0;
					return 0;
				}
			}
			superios[i].irq = cr70&0x0f;
			superios[i].dma = (((cr74 & 0x07) > 3) ?
					   PARPORT_DMA_NONE : (cr74 & 0x07));
			return 1;
		}
	}
	return 0;
}

static int __devinit decode_winbond(int efer, int key, int devid, int devrev, int oldid)
{
	const char *type = "unknown";
	int id,progif=2;

	if (devid == devrev)
		/* simple heuristics, we happened to read some
                   non-winbond register */
		return 0;

	id=(devid<<8) | devrev;

	/* Values are from public data sheets pdf files, I can just
           confirm 83977TF is correct :-) */
	if      (id == 0x9771) type="83977F/AF";
	else if (id == 0x9773) type="83977TF / SMSC 97w33x/97w34x";
	else if (id == 0x9774) type="83977ATF";
	else if ((id & ~0x0f) == 0x5270) type="83977CTF / SMSC 97w36x";
	else if ((id & ~0x0f) == 0x52f0) type="83977EF / SMSC 97w35x";
	else if ((id & ~0x0f) == 0x5210) type="83627";
	else if ((id & ~0x0f) == 0x6010) type="83697HF";
	else if ((oldid &0x0f ) == 0x0a) { type="83877F"; progif=1;}
	else if ((oldid &0x0f ) == 0x0b) { type="83877AF"; progif=1;}
	else if ((oldid &0x0f ) == 0x0c) { type="83877TF"; progif=1;}
	else if ((oldid &0x0f ) == 0x0d) { type="83877ATF"; progif=1;}
	else progif=0;

	if (verbose_probing)
		printk(KERN_INFO "Winbond chip at EFER=0x%x key=0x%02x "
		       "devid=%02x devrev=%02x oldid=%02x type=%s\n", 
		       efer, key, devid, devrev, oldid, type);

	if (progif == 2)
		return show_parconfig_winbond(efer,key);
	return 0;
}

static int __devinit decode_smsc(int efer, int key, int devid, int devrev)
{
        const char *type = "unknown";
	int (*func)(int io, int key);
        int id;

        if (devid == devrev)
		/* simple heuristics, we happened to read some
                   non-smsc register */
		return 0;

	func=NULL;
        id=(devid<<8) | devrev;

	if	(id==0x0302) {type="37c669"; func=show_parconfig_smsc37c669;}
	else if	(id==0x6582) type="37c665IR";
	else if	(devid==0x65) type="37c665GT";
	else if	(devid==0x66) type="37c666GT";

	if (verbose_probing)
		printk(KERN_INFO "SMSC chip at EFER=0x%x "
		       "key=0x%02x devid=%02x devrev=%02x type=%s\n",
		       efer, key, devid, devrev, type);

	if (func)
		return func(efer,key);
	return 0;
}


static void __devinit winbond_check(int io, int key)
{
	int devid,devrev,oldid,x_devid,x_devrev,x_oldid;

	if (!request_region(io, 3, __FUNCTION__))
		return;

	/* First probe without key */
	outb(0x20,io);
	x_devid=inb(io+1);
	outb(0x21,io);
	x_devrev=inb(io+1);
	outb(0x09,io);
	x_oldid=inb(io+1);

	outb(key,io);
	outb(key,io);     /* Write Magic Sequence to EFER, extended
                             funtion enable register */
	outb(0x20,io);    /* Write EFIR, extended function index register */
	devid=inb(io+1);  /* Read EFDR, extended function data register */
	outb(0x21,io);
	devrev=inb(io+1);
	outb(0x09,io);
	oldid=inb(io+1);
	outb(0xaa,io);    /* Magic Seal */

	if ((x_devid == devid) && (x_devrev == devrev) && (x_oldid == oldid))
		goto out; /* protection against false positives */

	if (decode_winbond(io,key,devid,devrev,oldid));
		return;
out:
	release_region(io, 3);
}

static void __devinit winbond_check2(int io,int key)
{
        int devid,devrev,oldid,x_devid,x_devrev,x_oldid;

	if (!request_region(io, 3, __FUNCTION__))
		return;

	/* First probe without the key */
	outb(0x20,io+2);
	x_devid=inb(io+2);
	outb(0x21,io+1);
	x_devrev=inb(io+2);
	outb(0x09,io+1);
	x_oldid=inb(io+2);

        outb(key,io);     /* Write Magic Byte to EFER, extended
                             funtion enable register */
        outb(0x20,io+2);  /* Write EFIR, extended function index register */
        devid=inb(io+2);  /* Read EFDR, extended function data register */
        outb(0x21,io+1);