Re: [RFC][PATCH] Xilinx uartlite serial driver

["David H. Lynch Jr." <dhlii@dlasys.net>]

Olof Johansson wrote:
> On Wed, 13 Sep 2006 15:39:09 +0200 Peter Korsgaard <jacmet@sunsite.dk> wrote:
>
>   
>>>>>>> "Peter" == Peter Korsgaard <jacmet@sunsite.dk> writes:
>>>>>>>               
>>  Olof> 2. There seems to be some timeout issues with tx_empty.
>>
>>  Peter> Huh, that's odd - I haven't noticed that. I'll test it again and get
>>  Peter> back to you.
>>
>> Ahh, found it - I didn't update the uart timeout in set_termios so it
>> used a very long timeout. Please give the updated patch a try.
>>     
>
> Looks good. Thanks.
>   

Peter;
    You force the port regshift value to 2 in your init code, but then
you ignore it and hard code the register offsets preshifted.
    I have never actually seen a UartLite implimentation with a shift
other than 2. But I have seen BSP's for other OS's with UartLites defaulting
    to a shift of 0. I am not an FPGA firmware guy, but I beleive you
can build them that way.
    Also there is no provision for running the UartLite without using
interrupts.
    The Pico E12/E14 frequently use FPGA firmare that does not include a
PIC.
     Some implimentations of the UartLite use dcr instead of memory
mapped ports.
   

>   
>> Additional changes:
>> - Actually add the fixes I did in May on request of Russell
>> - Update for 2.6.18 (devfs and new IRQF defines)
>> - Removed the SERIAL_UARTLITE_NR_UARTS config option as we only have 4
>>   minors reserved with lanana anyway.
>>
>> Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
>>     
>
> Acked-by: Olof Johansson <olof@lixom.net>
>
>   
>> diff -urpN linux-2.6.18-rc7.orig/drivers/serial/Kconfig linux-2.6.18-rc7/drivers/serial/Kconfig
>> --- linux-2.6.18-rc7.orig/drivers/serial/Kconfig	2006-09-13 15:01:24.000000000 +0200
>> +++ linux-2.6.18-rc7/drivers/serial/Kconfig	2006-09-13 15:01:51.000000000 +0200
>> @@ -511,6 +511,25 @@ config SERIAL_IMX_CONSOLE
>>  	  your boot loader (lilo or loadlin) about how to pass options to the
>>  	  kernel at boot time.)
>>  
>> +config SERIAL_UARTLITE
>> +	tristate "Xilinx uartlite serial port support"
>> +	depends on PPC32
>> +	select SERIAL_CORE
>> +	help
>> +	  Say Y here if you want to use the Xilinx uartlite serial controller.
>> +
>> +	  To compile this driver as a module, choose M here: the
>> +	  module will be called uartlite.ko.
>> +
>> +config SERIAL_UARTLITE_CONSOLE
>> +	bool "Support for console on Xilinx uartlite serial port"
>> +	depends on SERIAL_UARTLITE=y
>> +	select SERIAL_CORE_CONSOLE
>> +	help
>> +	  Say Y here if you wish to use a Xilinx uartlite as the system
>> +	  console (the system console is the device which receives all kernel
>> +	  messages and warnings and which allows logins in single user mode).
>> +
>>  config SERIAL_SUNCORE
>>  	bool
>>  	depends on SPARC
>> diff -urpN linux-2.6.18-rc7.orig/drivers/serial/Makefile linux-2.6.18-rc7/drivers/serial/Makefile
>> --- linux-2.6.18-rc7.orig/drivers/serial/Makefile	2006-09-13 15:01:24.000000000 +0200
>> +++ linux-2.6.18-rc7/drivers/serial/Makefile	2006-09-13 15:01:51.000000000 +0200
>> @@ -55,4 +55,5 @@ obj-$(CONFIG_SERIAL_VR41XX) += vr41xx_si
>>  obj-$(CONFIG_SERIAL_SGI_IOC4) += ioc4_serial.o
>>  obj-$(CONFIG_SERIAL_SGI_IOC3) += ioc3_serial.o
>>  obj-$(CONFIG_SERIAL_AT91) += at91_serial.o
>> +obj-$(CONFIG_SERIAL_UARTLITE) += uartlite.o
>>  obj-$(CONFIG_SERIAL_NETX) += netx-serial.o
>> diff -urpN linux-2.6.18-rc7.orig/drivers/serial/uartlite.c linux-2.6.18-rc7/drivers/serial/uartlite.c
>> --- linux-2.6.18-rc7.orig/drivers/serial/uartlite.c	1970-01-01 01:00:00.000000000 +0100
>> +++ linux-2.6.18-rc7/drivers/serial/uartlite.c	2006-09-13 15:01:51.000000000 +0200
>> @@ -0,0 +1,496 @@
>> +/*
>> + * uartlite.c: Serial driver for Xilinx uartlite serial controller
>> + *
>> + * Peter Korsgaard <jacmet@sunsite.dk>
>> + *
>> + * This file is licensed under the terms of the GNU General Public License
>> + * version 2.  This program is licensed "as is" without any warranty of any
>> + * kind, whether express or implied.
>> + */
>> +
>> +#include <linux/platform_device.h>
>> +#include <linux/module.h>
>> +#include <linux/console.h>
>> +#include <linux/serial.h>
>> +#include <linux/serial_core.h>
>> +#include <linux/tty.h>
>> +#include <linux/delay.h>
>> +#include <linux/interrupt.h>
>> +#include <asm/io.h>
>> +
>> +#define ULITE_MAJOR		204
>> +#define ULITE_MINOR		187
>> +#define ULITE_NR_UARTS		4
>> +
>> +/* For register details see datasheet:
>> +   http://www.xilinx.com/bvdocs/ipcenter/data_sheet/opb_uartlite.pdf
>> +*/
>> +#define ULITE_RX		0x00
>> +#define ULITE_TX		0x04
>> +#define ULITE_STATUS		0x08
>> +#define ULITE_CONTROL		0x0c
>> +
>> +#define ULITE_REGION		16
>> +
>> +#define ULITE_STATUS_RXVALID	0x01
>> +#define ULITE_STATUS_RXFULL	0x02
>> +#define ULITE_STATUS_TXEMPTY	0x04
>> +#define ULITE_STATUS_TXFULL	0x08
>> +#define ULITE_STATUS_IE		0x10
>> +#define ULITE_STATUS_OVERRUN	0x20
>> +#define ULITE_STATUS_FRAME	0x40
>> +#define ULITE_STATUS_PARITY	0x80
>> +
>> +#define ULITE_CONTROL_RST_TX	0x01
>> +#define ULITE_CONTROL_RST_RX	0x02
>> +#define ULITE_CONTROL_IE	0x10
>> +
>> +
>> +static struct uart_port ports[ULITE_NR_UARTS];
>> +
>> +static int ulite_receive(struct uart_port *port, int stat)
>> +{
>> +	struct tty_struct *tty = port->info->tty;
>> +	unsigned char ch = 0;
>> +	char flag = TTY_NORMAL;
>> +
>> +	if ((stat & (ULITE_STATUS_RXVALID | ULITE_STATUS_OVERRUN
>> +		     | ULITE_STATUS_FRAME)) == 0)
>> +		return 0;
>> +
>> +	/* stats */
>> +	if (stat & ULITE_STATUS_RXVALID) {
>> +		port->icount.rx++;
>> +		ch = readb(port->membase + ULITE_RX);
>> +
>> +		if (stat & ULITE_STATUS_PARITY)
>> +			port->icount.parity++;
>> +	}
>> +
>> +	if (stat & ULITE_STATUS_OVERRUN)
>> +		port->icount.overrun++;
>> +
>> +	if (stat & ULITE_STATUS_FRAME)
>> +		port->icount.frame++;
>> +
>> +
>> +	/* drop byte with parity error if IGNPAR specificed */
>> +	if (stat & port->ignore_status_mask & ULITE_STATUS_PARITY)
>> +		stat &= ~ULITE_STATUS_RXVALID;
>> +
>> +	stat &= port->read_status_mask;
>> +
>> +	if (stat & ULITE_STATUS_PARITY)
>> +		flag = TTY_PARITY;
>> +
>> +
>> +	stat &= ~port->ignore_status_mask;
>> +
>> +	if (stat & ULITE_STATUS_RXVALID)
>> +		tty_insert_flip_char(tty, ch, flag);
>> +
>> +	if (stat & ULITE_STATUS_FRAME)
>> +		tty_insert_flip_char(tty, 0, TTY_FRAME);
>> +
>> +	if (stat & ULITE_STATUS_OVERRUN)
>> +		tty_insert_flip_char(tty, 0, TTY_OVERRUN);
>> +
>> +	return 1;
>> +}
>> +
>> +static int ulite_transmit(struct uart_port *port, int stat)
>> +{
>> +	struct circ_buf *xmit  = &port->info->xmit;
>> +
>> +	if (stat & ULITE_STATUS_TXFULL)
>> +		return 0;
>> +
>> +	if (port->x_char) {
>> +		writeb(port->x_char, port->membase + ULITE_TX);
>> +		port->x_char = 0;
>> +		port->icount.tx++;
>> +		return 1;
>> +	}
>> +
>> +	if (uart_circ_empty(xmit) || uart_tx_stopped(port))
>> +		return 0;
>> +
>> +	writeb(xmit->buf[xmit->tail], port->membase + ULITE_TX);
>> +	xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE-1);
>> +	port->icount.tx++;
>> +
>> +	/* wake up */
>> +	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
>> +		uart_write_wakeup(port);
>> +
>> +	return 1;
>> +}
>> +
>> +static irqreturn_t ulite_isr(int irq, void *dev_id, struct pt_regs *regs)
>> +{
>> +	struct uart_port *port = (struct uart_port *)dev_id;
>> +	int busy;
>> +
>> +	do {
>> +		int stat = readb(port->membase + ULITE_STATUS);
>> +		busy  = ulite_receive(port, stat);
>> +		busy |= ulite_transmit(port, stat);
>> +	} while (busy);
>> +
>> +	tty_flip_buffer_push(port->info->tty);
>> +
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +static unsigned int ulite_tx_empty(struct uart_port *port)
>> +{
>> +	unsigned long flags;
>> +	unsigned int ret;
>> +
>> +	spin_lock_irqsave(&port->lock, flags);
>> +	ret = readb(port->membase + ULITE_STATUS);
>> +	spin_unlock_irqrestore(&port->lock, flags);
>> +
>> +	return ret & ULITE_STATUS_TXEMPTY ? TIOCSER_TEMT : 0;
>> +}
>> +
>> +static unsigned int ulite_get_mctrl(struct uart_port *port)
>> +{
>> +	return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
>> +}
>> +
>> +static void ulite_set_mctrl(struct uart_port *port, unsigned int mctrl)
>> +{
>> +	/* N/A */
>> +}
>> +
>> +static void ulite_stop_tx(struct uart_port *port)
>> +{
>> +	/* N/A */
>> +}
>> +
>> +static void ulite_start_tx(struct uart_port *port)
>> +{
>> +	ulite_transmit(port, readb(port->membase + ULITE_STATUS));
>> +}
>> +
>> +static void ulite_stop_rx(struct uart_port *port)
>> +{
>> +	/* don't forward any more data (like !CREAD) */
>> +	port->ignore_status_mask = ULITE_STATUS_RXVALID | ULITE_STATUS_PARITY
>> +		| ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN;
>> +}
>> +
>> +static void ulite_enable_ms(struct uart_port *port)
>> +{
>> +	/* N/A */
>> +}
>> +
>> +static void ulite_break_ctl(struct uart_port *port, int ctl)
>> +{
>> +	/* N/A */
>> +}
>> +
>> +static int ulite_startup(struct uart_port *port)
>> +{
>> +	int ret;
>> +
>> +	ret = request_irq(port->irq, ulite_isr,
>> +			  IRQF_DISABLED | IRQF_SAMPLE_RANDOM, "uartlite", port);
>> +	if (ret)
>> +		return ret;
>> +
>> +	writeb(ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX,
>> +	       port->membase + ULITE_CONTROL);
>> +	writeb(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL);
>> +
>> +	return 0;
>> +}
>> +
>> +static void ulite_shutdown(struct uart_port *port)
>> +{
>> +	writeb(0, port->membase + ULITE_CONTROL);
>> +	free_irq(port->irq, port);
>> +}
>> +
>> +static void ulite_set_termios(struct uart_port *port, struct termios *termios,
>> +			      struct termios *old)
>> +{
>> +	unsigned long flags;
>> +	unsigned int baud;
>> +
>> +	spin_lock_irqsave(&port->lock, flags);
>> +
>> +	port->read_status_mask = ULITE_STATUS_RXVALID | ULITE_STATUS_OVERRUN
>> +		| ULITE_STATUS_TXFULL;
>> +
>> +	if (termios->c_iflag & INPCK)
>> +		port->read_status_mask |=
>> +			ULITE_STATUS_PARITY | ULITE_STATUS_FRAME;
>> +
>> +	port->ignore_status_mask = 0;
>> +	if (termios->c_iflag & IGNPAR)
>> +		port->ignore_status_mask |= ULITE_STATUS_PARITY
>> +			| ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN;
>> +
>> +	/* ignore all characters if CREAD is not set */
>> +	if ((termios->c_cflag & CREAD) == 0)
>> +		port->ignore_status_mask |=
>> +			ULITE_STATUS_RXVALID | ULITE_STATUS_PARITY
>> +			| ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN;
>> +
>> +	/* update timeout */
>> +	baud = uart_get_baud_rate(port, termios, old, 0, 460800);
>> +	uart_update_timeout(port, termios->c_cflag, baud);
>> +
>> +	spin_unlock_irqrestore(&port->lock, flags);
>> +}
>> +
>> +static const char *ulite_type(struct uart_port *port)
>> +{
>> +	return port->type == PORT_UARTLITE ? "uartlite" : NULL;
>> +}
>> +
>> +static void ulite_release_port(struct uart_port *port)
>> +{
>> +	release_mem_region(port->mapbase, ULITE_REGION);
>> +	iounmap(port->membase);
>> +	port->membase = 0;
>> +}
>> +
>> +static int ulite_request_port(struct uart_port *port)
>> +{
>> +	if (!request_mem_region(port->mapbase, ULITE_REGION, "uartlite")) {
>> +		dev_err(port->dev, "Memory region busy\n");
>> +		return -EBUSY;
>> +	}
>> +
>> +	port->membase = ioremap(port->mapbase, ULITE_REGION);
>> +	if (!port->membase) {
>> +		dev_err(port->dev, "Unable to map registers\n");
>> +		release_mem_region(port->mapbase, ULITE_REGION);
>> +		return -EBUSY;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static void ulite_config_port(struct uart_port *port, int flags)
>> +{
>> +	ulite_request_port(port);
>> +	port->type = PORT_UARTLITE;
>> +}
>> +
>> +static int ulite_verify_port(struct uart_port *port, struct serial_struct *ser)
>> +{
>> +	/* we don't want the core code to modify any port params */
>> +	return -EINVAL;
>> +}
>> +
>> +static struct uart_ops ulite_ops = {
>> +	.tx_empty	= ulite_tx_empty,
>> +	.set_mctrl	= ulite_set_mctrl,
>> +	.get_mctrl	= ulite_get_mctrl,
>> +	.stop_tx	= ulite_stop_tx,
>> +	.start_tx	= ulite_start_tx,
>> +	.stop_rx	= ulite_stop_rx,
>> +	.enable_ms	= ulite_enable_ms,
>> +	.break_ctl	= ulite_break_ctl,
>> +	.startup	= ulite_startup,
>> +	.shutdown	= ulite_shutdown,
>> +	.set_termios	= ulite_set_termios,
>> +	.type		= ulite_type,
>> +	.release_port	= ulite_release_port,
>> +	.request_port	= ulite_request_port,
>> +	.config_port	= ulite_config_port,
>> +	.verify_port	= ulite_verify_port
>> +};
>> +
>> +#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
>> +static void ulite_console_wait_tx(struct uart_port *port)
>> +{
>> +	int i;
>> +
>> +	/* wait up to 10ms for the character(s) to be sent */
>> +	for (i=0; i<10000; i++) {
>> +		if (readb(port->membase + ULITE_STATUS) & ULITE_STATUS_TXEMPTY)
>> +			break;
>> +		udelay(1);
>> +	}
>> +}
>> +
>> +static void ulite_console_putchar(struct uart_port *port, int ch)
>> +{
>> +	ulite_console_wait_tx(port);
>> +	writeb(ch, port->membase + ULITE_TX);
>> +}
>> +
>> +static void ulite_console_write(struct console *co, const char *s,
>> +				unsigned int count)
>> +{
>> +	struct uart_port *port = &ports[co->index];
>> +	unsigned long flags;
>> +	unsigned int ier;
>> +	int locked = 1;
>> +
>> +	if (oops_in_progress) {
>> +		locked = spin_trylock_irqsave(&port->lock, flags);
>> +	} else
>> +		spin_lock_irqsave(&port->lock, flags);
>> +
>> +	/* save and disable interrupt */
>> +	ier = readb(port->membase + ULITE_STATUS) & ULITE_STATUS_IE;
>> +	writeb(0, port->membase + ULITE_CONTROL);
>> +
>> +	uart_console_write(port, s, count, ulite_console_putchar);
>> +
>> +	ulite_console_wait_tx(port);
>> +
>> +	/* restore interrupt state */
>> +	if (ier)
>> +		writeb(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL);
>> +
>> +	if (locked)
>> +		spin_unlock_irqrestore(&port->lock, flags);
>> +}
>> +
>> +static int __init ulite_console_setup(struct console *co, char *options)
>> +{
>> +	struct uart_port *port;
>> +
>> +	if (co->index < 0 || co->index >= ULITE_NR_UARTS)
>> +		return -EINVAL;
>> +
>> +	port = &ports[co->index];
>> +
>> +	/* not initialized yet? */
>> +	if (!port->membase)
>> +		return -ENODEV;
>> +
>> +	return 0;
>> +}
>> +
>> +static struct uart_driver ulite_uart_driver;
>> +
>> +static struct console ulite_console = {
>> +	.name	= "ttyUL",
>> +	.write	= ulite_console_write,
>> +	.device	= uart_console_device,
>> +	.setup	= ulite_console_setup,
>> +	.flags	= CON_PRINTBUFFER,
>> +	.index	= -1, /* Specified on the cmdline (e.g. console=ttyUL0 ) */
>> +	.data	= &ulite_uart_driver,
>> +};
>> +
>> +static int __init ulite_console_init(void)
>> +{
>> +	register_console(&ulite_console);
>> +	return 0;
>> +}
>> +
>> +console_initcall(ulite_console_init);
>> +
>> +#endif /* CONFIG_SERIAL_UARTLITE_CONSOLE */
>> +
>> +static struct uart_driver ulite_uart_driver = {
>> +	.owner		= THIS_MODULE,
>> +	.driver_name	= "uartlite",
>> +	.dev_name	= "ttyUL",
>> +	.major		= ULITE_MAJOR,
>> +	.minor		= ULITE_MINOR,
>> +	.nr		= ULITE_NR_UARTS,
>> +#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
>> +	.cons		= &ulite_console,
>> +#endif
>> +};
>> +
>> +static int __devinit ulite_probe(struct platform_device *pdev)
>> +{
>> +	struct resource *res, *res2;
>> +	struct uart_port *port;
>> +
>> +	if (pdev->id < 0 || pdev->id >= ULITE_NR_UARTS)
>> +		return -EINVAL;
>> +
>> +	if (ports[pdev->id].membase)
>> +		return -EBUSY;
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	if (!res)
>> +		return -ENODEV;
>> +
>> +	res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>> +	if (!res2)
>> +		return -ENODEV;
>> +
>> +	port = &ports[pdev->id];
>> +
>> +	port->fifosize	= 16;
>> +	port->regshift	= 2;
>> +	port->iotype	= UPIO_MEM;
>> +	port->iobase	= 1; /* mark port in use */
>> +	port->mapbase	= res->start;
>> +	port->membase	= 0;
>> +	port->ops	= &ulite_ops;
>> +	port->irq	= res2->start;
>> +	port->flags	= UPF_BOOT_AUTOCONF;
>> +	port->dev	= &pdev->dev;
>> +	port->type	= PORT_UNKNOWN;
>> +
>> +	uart_add_one_port(&ulite_uart_driver, port);
>> +	platform_set_drvdata(pdev, port);
>> +
>> +	return 0;
>> +}
>> +
>> +static int ulite_remove(struct platform_device *pdev)
>> +{
>> +	struct uart_port *port = platform_get_drvdata(pdev);
>> +
>> +	platform_set_drvdata(pdev, NULL);
>> +
>> +	if (port)
>> +		uart_remove_one_port(&ulite_uart_driver, port);
>> +
>> +	/* mark port as free */
>> +	port->membase = 0;
>> +
>> +	return 0;
>> +}
>> +
>> +static struct platform_driver ulite_platform_driver = {
>> +	.probe	= ulite_probe,
>> +	.remove	= ulite_remove,
>> +	.driver	= {
>> +		   .owner = THIS_MODULE,
>> +		   .name  = "uartlite",
>> +		   },
>> +};
>> +
>> +int __init ulite_init(void)
>> +{
>> +	int ret;
>> +
>> +	ret = uart_register_driver(&ulite_uart_driver);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = platform_driver_register(&ulite_platform_driver);
>> +	if (ret)
>> +		uart_unregister_driver(&ulite_uart_driver);
>> +
>> +	return ret;
>> +}
>> +
>> +void __exit ulite_exit(void)
>> +{
>> +	platform_driver_unregister(&ulite_platform_driver);
>> +	uart_unregister_driver(&ulite_uart_driver);
>> +}
>> +
>> +module_init(ulite_init);
>> +module_exit(ulite_exit);
>> +
>> +MODULE_AUTHOR("Peter Korsgaard <jacmet@sunsite.dk>");
>> +MODULE_DESCRIPTION("Xilinx uartlite serial driver");
>> +MODULE_LICENSE("GPL");
>> diff -urpN linux-2.6.18-rc7.orig/include/linux/serial_core.h linux-2.6.18-rc7/include/linux/serial_core.h
>> --- linux-2.6.18-rc7.orig/include/linux/serial_core.h	2006-09-13 15:01:25.000000000 +0200
>> +++ linux-2.6.18-rc7/include/linux/serial_core.h	2006-09-13 15:01:51.000000000 +0200
>> @@ -132,6 +132,8 @@
>>  
>>  #define PORT_S3C2412	73
>>  
>> +/* Xilinx uartlite */
>> +#define PORT_UARTLITE	74
>>  
>>  #ifdef __KERNEL__
>>  
>> diff -urpN linux-2.6.18-rc7.orig/MAINTAINERS linux-2.6.18-rc7/MAINTAINERS
>> --- linux-2.6.18-rc7.orig/MAINTAINERS	2006-09-13 15:01:20.000000000 +0200
>> +++ linux-2.6.18-rc7/MAINTAINERS	2006-09-13 15:01:51.000000000 +0200
>> @@ -3303,6 +3303,12 @@ W:	http://oss.sgi.com/projects/xfs
>>  T:	git git://oss.sgi.com:8090/xfs/xfs-2.6
>>  S:	Supported
>>  
>> +XILINX UARTLITE SERIAL DRIVER
>> +P:	Peter Korsgaard
>> +M:	jacmet@sunsite.dk
>> +L:	linux-serial@vger.kernel.org
>> +S:	Maintained
>> +
>>  X86 3-LEVEL PAGING (PAE) SUPPORT
>>  P:	Ingo Molnar
>>  M:	mingo@redhat.com
>>
>>     
> -
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>   


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Dave Lynch 					  	    DLA Systems
Software Development:  				         Embedded Linux
717.627.3770 	       dhlii@dlasys.net 	  http://www.dlasys.net
fax: 1.253.369.9244 			           Cell: 1.717.587.7774
Over 25 years' experience in platforms, languages, and technologies too numerous to list.

"Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction."
Albert Einstein