ieee1284.c

linux和2410结合开发 用他可以生成2410所需的zImage文件

				     | PARPORT_STATUS_PAPEROUT
				     | PARPORT_STATUS_ACK,
				     PARPORT_STATUS_ERROR
				     | PARPORT_STATUS_SELECT
				     | PARPORT_STATUS_PAPEROUT)) {
		/* Timeout */
		parport_frob_control (port,
				      PARPORT_CONTROL_SELECT
				      | PARPORT_CONTROL_AUTOFD,
				      PARPORT_CONTROL_SELECT);
		DPRINTK (KERN_DEBUG
			 "%s: Peripheral not IEEE1284 compliant (0x%02X)\n",
			 port->name, parport_read_status (port));
		port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
		return -1; /* Not IEEE1284 compliant */
	}

	/* Event 3: Set nStrobe low */
	parport_frob_control (port,
			      PARPORT_CONTROL_STROBE,
			      PARPORT_CONTROL_STROBE);

	/* Event 4: Set nStrobe and nAutoFd high */
	udelay (5);
	parport_frob_control (port,
			      PARPORT_CONTROL_STROBE
			      | PARPORT_CONTROL_AUTOFD,
			      0);

	/* Event 6: nAck goes high */
	if (parport_wait_peripheral (port,
				     PARPORT_STATUS_ACK,
				     PARPORT_STATUS_ACK)) {
		/* This shouldn't really happen with a compliant device. */
		DPRINTK (KERN_DEBUG
			 "%s: Mode 0x%02x not supported? (0x%02x)\n",
			 port->name, mode, port->ops->read_status (port));
		parport_ieee1284_terminate (port);
		return 1;
	}

	xflag = parport_read_status (port) & PARPORT_STATUS_SELECT;

	/* xflag should be high for all modes other than nibble (0). */
	if (mode && !xflag) {
		/* Mode not supported. */
		DPRINTK (KERN_DEBUG "%s: Mode 0x%02x rejected by peripheral\n",
			 port->name, mode);
		parport_ieee1284_terminate (port);
		return 1;
	}

	/* More to do if we've requested extensibility link. */
	if (mode & IEEE1284_EXT_LINK) {
		m = mode & 0x7f;
		udelay (1);
		parport_write_data (port, m);
		udelay (1);

		/* Event 51: Set nStrobe low */
		parport_frob_control (port,
				      PARPORT_CONTROL_STROBE,
				      PARPORT_CONTROL_STROBE);

		/* Event 52: nAck goes low */
		if (parport_wait_peripheral (port, PARPORT_STATUS_ACK, 0)) {
			/* This peripheral is _very_ slow. */
			DPRINTK (KERN_DEBUG
				 "%s: Event 52 didn't happen\n",
				 port->name);
			parport_ieee1284_terminate (port);
			return 1;
		}

		/* Event 53: Set nStrobe high */
		parport_frob_control (port,
				      PARPORT_CONTROL_STROBE,
				      0);

		/* Event 55: nAck goes high */
		if (parport_wait_peripheral (port,
					     PARPORT_STATUS_ACK,
					     PARPORT_STATUS_ACK)) {
			/* This shouldn't really happen with a compliant
			 * device. */
			DPRINTK (KERN_DEBUG
				 "%s: Mode 0x%02x not supported? (0x%02x)\n",
				 port->name, mode,
				 port->ops->read_status (port));
			parport_ieee1284_terminate (port);
			return 1;
		}

		/* Event 54: Peripheral sets XFlag to reflect support */
		xflag = parport_read_status (port) & PARPORT_STATUS_SELECT;

		/* xflag should be high. */
		if (!xflag) {
			/* Extended mode not supported. */
			DPRINTK (KERN_DEBUG "%s: Extended mode 0x%02x not "
				 "supported\n", port->name, mode);
			parport_ieee1284_terminate (port);
			return 1;
		}

		/* Any further setup is left to the caller. */
	}

	/* Mode is supported */
	DPRINTK (KERN_DEBUG "%s: In mode 0x%02x\n", port->name, mode);
	port->ieee1284.mode = mode;

	/* But ECP is special */
	if (!(mode & IEEE1284_EXT_LINK) && (m & IEEE1284_MODE_ECP)) {
		port->ieee1284.phase = IEEE1284_PH_ECP_SETUP;

		/* Event 30: Set nAutoFd low */
		parport_frob_control (port,
				      PARPORT_CONTROL_AUTOFD,
				      PARPORT_CONTROL_AUTOFD);

		/* Event 31: PError goes high. */
		r = parport_wait_peripheral (port,
					     PARPORT_STATUS_PAPEROUT,
					     PARPORT_STATUS_PAPEROUT);
		if (r) {
			DPRINTK (KERN_INFO "%s: Timeout at event 31\n",
				port->name);
		}

		port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
		DPRINTK (KERN_DEBUG "%s: ECP direction: forward\n",
			 port->name);
	} else switch (mode) {
	case IEEE1284_MODE_NIBBLE:
	case IEEE1284_MODE_BYTE:
		port->ieee1284.phase = IEEE1284_PH_REV_IDLE;
		break;
	default:
		port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
	}


	return 0;
#endif /* IEEE1284 support */
}

/* Acknowledge that the peripheral has data available.
 * Events 18-20, in order to get from Reverse Idle phase
 * to Host Busy Data Available.
 * This will most likely be called from an interrupt.
 * Returns zero if data was available.
 */
#ifdef CONFIG_PARPORT_1284
static int parport_ieee1284_ack_data_avail (struct parport *port)
{
	if (parport_read_status (port) & PARPORT_STATUS_ERROR)
		/* Event 18 didn't happen. */
		return -1;

	/* Event 20: nAutoFd goes high. */
	port->ops->frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
	port->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL;
	return 0;
}
#endif /* IEEE1284 support */

/* Handle an interrupt. */
void parport_ieee1284_interrupt (int which, void *handle, struct pt_regs *regs)
{
	struct parport *port = handle;
	parport_ieee1284_wakeup (port);

#ifdef CONFIG_PARPORT_1284
	if (port->ieee1284.phase == IEEE1284_PH_REV_IDLE) {
		/* An interrupt in this phase means that data
		 * is now available. */
		DPRINTK (KERN_DEBUG "%s: Data available\n", port->name);
		parport_ieee1284_ack_data_avail (port);
	}
#endif /* IEEE1284 support */
}

/**
 *	parport_write - write a block of data to a parallel port
 *	@port: port to write to
 *	@buffer: data buffer (in kernel space)
 *	@len: number of bytes of data to transfer
 *
 *	This will write up to @len bytes of @buffer to the port
 *	specified, using the IEEE 1284 transfer mode most recently
 *	negotiated to (using parport_negotiate()), as long as that
 *	mode supports forward transfers (host to peripheral).
 *
 *	It is the caller's responsibility to ensure that the first
 *	@len bytes of @buffer are valid.
 *
 *	This function returns the number of bytes transferred (if zero
 *	or positive), or else an error code.
 */

ssize_t parport_write (struct parport *port, const void *buffer, size_t len)
{
#ifndef CONFIG_PARPORT_1284
	return port->ops->compat_write_data (port, buffer, len, 0);
#else
	ssize_t retval;
	int mode = port->ieee1284.mode;
	int addr = mode & IEEE1284_ADDR;
	size_t (*fn) (struct parport *, const void *, size_t, int);

	/* Ignore the device-ID-request bit and the address bit. */
	mode &= ~(IEEE1284_DEVICEID | IEEE1284_ADDR);

	/* Use the mode we're in. */
	switch (mode) {
	case IEEE1284_MODE_NIBBLE:
	case IEEE1284_MODE_BYTE:
		parport_negotiate (port, IEEE1284_MODE_COMPAT);
	case IEEE1284_MODE_COMPAT:
		DPRINTK (KERN_DEBUG "%s: Using compatibility mode\n",
			 port->name);
		fn = port->ops->compat_write_data;
		break;

	case IEEE1284_MODE_EPP:
		DPRINTK (KERN_DEBUG "%s: Using EPP mode\n", port->name);
		if (addr) {
			fn = port->ops->epp_write_addr;
		} else {
			fn = port->ops->epp_write_data;
		}
		break;
	case IEEE1284_MODE_EPPSWE:
		DPRINTK (KERN_DEBUG "%s: Using software-emulated EPP mode\n",
			port->name);
		if (addr) {
			fn = parport_ieee1284_epp_write_addr;
		} else {
			fn = parport_ieee1284_epp_write_data;
		}
		break;
	case IEEE1284_MODE_ECP:
	case IEEE1284_MODE_ECPRLE:
		DPRINTK (KERN_DEBUG "%s: Using ECP mode\n", port->name);
		if (addr) {
			fn = port->ops->ecp_write_addr;
		} else {
			fn = port->ops->ecp_write_data;
		}
		break;

	case IEEE1284_MODE_ECPSWE:
		DPRINTK (KERN_DEBUG "%s: Using software-emulated ECP mode\n",
			 port->name);
		/* The caller has specified that it must be emulated,
		 * even if we have ECP hardware! */
		if (addr) {
			fn = parport_ieee1284_ecp_write_addr;
		} else {
			fn = parport_ieee1284_ecp_write_data;
		}
		break;

	default:
		DPRINTK (KERN_DEBUG "%s: Unknown mode 0x%02x\n", port->name,
			port->ieee1284.mode);
		return -ENOSYS;
	}

	retval = (*fn) (port, buffer, len, 0);
	DPRINTK (KERN_DEBUG "%s: wrote %d/%d bytes\n", port->name, retval, len);
	return retval;
#endif /* IEEE1284 support */
}

/**
 *	parport_read - read a block of data from a parallel port
 *	@port: port to read from
 *	@buffer: data buffer (in kernel space)
 *	@len: number of bytes of data to transfer
 *
 *	This will read up to @len bytes of @buffer to the port
 *	specified, using the IEEE 1284 transfer mode most recently
 *	negotiated to (using parport_negotiate()), as long as that
 *	mode supports reverse transfers (peripheral to host).
 *
 *	It is the caller's responsibility to ensure that the first
 *	@len bytes of @buffer are available to write to.
 *
 *	This function returns the number of bytes transferred (if zero
 *	or positive), or else an error code.
 */

ssize_t parport_read (struct parport *port, void *buffer, size_t len)
{
#ifndef CONFIG_PARPORT_1284
	printk (KERN_ERR "parport: IEEE1284 not supported in this kernel\n");
	return -ENODEV;
#else
	int mode = port->physport->ieee1284.mode;
	int addr = mode & IEEE1284_ADDR;
	size_t (*fn) (struct parport *, void *, size_t, int);

	/* Ignore the device-ID-request bit and the address bit. */
	mode &= ~(IEEE1284_DEVICEID | IEEE1284_ADDR);

	/* Use the mode we're in. */
	switch (mode) {
	case IEEE1284_MODE_COMPAT:
		/* if we can tri-state use BYTE mode instead of NIBBLE mode,
		 * if that fails, revert to NIBBLE mode -- ought to store somewhere
		 * the device's ability to do BYTE mode reverse transfers, so we don't
		 * end up needlessly calling negotiate(BYTE) repeately..  (fb)
		 */
		if ((port->physport->modes & PARPORT_MODE_TRISTATE) &&
		    !parport_negotiate (port, IEEE1284_MODE_BYTE)) {
			/* got into BYTE mode OK */
			DPRINTK (KERN_DEBUG "%s: Using byte mode\n", port->name);
			fn = port->ops->byte_read_data;
			break;
		}
		if (parport_negotiate (port, IEEE1284_MODE_NIBBLE)) {
			return -EIO;
		}
		/* fall through to NIBBLE */
	case IEEE1284_MODE_NIBBLE:
		DPRINTK (KERN_DEBUG "%s: Using nibble mode\n", port->name);
		fn = port->ops->nibble_read_data;
		break;

	case IEEE1284_MODE_BYTE:
		DPRINTK (KERN_DEBUG "%s: Using byte mode\n", port->name);
		fn = port->ops->byte_read_data;
		break;

	case IEEE1284_MODE_EPP:
		DPRINTK (KERN_DEBUG "%s: Using EPP mode\n", port->name);
		if (addr) {
			fn = port->ops->epp_read_addr;
		} else {
			fn = port->ops->epp_read_data;
		}
		break;
	case IEEE1284_MODE_EPPSWE:
		DPRINTK (KERN_DEBUG "%s: Using software-emulated EPP mode\n",
			port->name);
		if (addr) {
			fn = parport_ieee1284_epp_read_addr;
		} else {
			fn = parport_ieee1284_epp_read_data;
		}
		break;
	case IEEE1284_MODE_ECP:
	case IEEE1284_MODE_ECPRLE:
		DPRINTK (KERN_DEBUG "%s: Using ECP mode\n", port->name);
		fn = port->ops->ecp_read_data;
		break;

	case IEEE1284_MODE_ECPSWE:
		DPRINTK (KERN_DEBUG "%s: Using software-emulated ECP mode\n",
			 port->name);
		fn = parport_ieee1284_ecp_read_data;
		break;

	default:
		DPRINTK (KERN_DEBUG "%s: Unknown mode 0x%02x\n", port->name,
			 port->physport->ieee1284.mode);
		return -ENOSYS;
	}

	return (*fn) (port, buffer, len, 0);
#endif /* IEEE1284 support */
}

/**
 *	parport_set_timeout - set the inactivity timeout for a device
 *	@dev: device on a port
 *	@inactivity: inactivity timeout (in jiffies)
 *
 *	This sets the inactivity timeout for a particular device on a
 *	port.  This affects functions like parport_wait_peripheral().
 *	The special value 0 means not to call schedule() while dealing
 *	with this device.
 *
 *	The return value is the previous inactivity timeout.
 *
 *	Any callers of parport_wait_event() for this device are woken
 *	up.
 */

long parport_set_timeout (struct pardevice *dev, long inactivity)
{
	long int old = dev->timeout;

	dev->timeout = inactivity;

	if (dev->port->physport->cad == dev)
		parport_ieee1284_wakeup (dev->port);

	return old;
}