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-HAYES ESP DRIVER VERSION 2.1
-
-A big thanks to the people at Hayes, especially Alan Adamson.  Their support
-has enabled me to provide enhancements to the driver.
-
-Please report your experiences with this driver to me (arobinso@nyx.net).  I
-am looking for both positive and negative feedback.
-
-*** IMPORTANT CHANGES FOR 2.1 ***
-Support for PIO mode.  Five situations will cause PIO mode to be used:
-1) A multiport card is detected.  PIO mode will always be used.  (8 port cards
-do not support DMA).
-2) The DMA channel is set to an invalid value (anything other than 1 or 3).
-3) The DMA buffer/channel could not be allocated.  The port will revert to PIO
-mode until it is reopened.
-4) Less than a specified number of bytes need to be transferred to/from the
-FIFOs.  PIO mode will be used for that transfer only.
-5) A port needs to do a DMA transfer and another port is already using the
-DMA channel.  PIO mode will be used for that transfer only.
-
-Since the Hayes ESP seems to conflict with other cards (notably sound cards)
-when using DMA, DMA is turned off by default.  To use DMA, it must be turned
-on explicitly, either with the "dma=" option described below or with
-setserial.  A multiport card can be forced into DMA mode by using setserial;
-however, most multiport cards don't support DMA.
-
-The latest version of setserial allows the enhanced configuration of the ESP
-card to be viewed and modified.
-***
-
-This package contains the files needed to compile a module to support the Hayes
-ESP card.  The drivers are basically a modified version of the serial drivers.
-
-Features:
-
-- Uses the enhanced mode of the ESP card, allowing a wider range of
-  interrupts and features than compatibility mode
-- Uses DMA and 16 bit PIO mode to transfer data to and from the ESP's FIFOs,
-  reducing CPU load
-- Supports primary and secondary ports
-
-
-If the driver is compiled as a module, the IRQs to use can be specified by
-using the irq= option.  The format is:
-
-irq=[0x100],[0x140],[0x180],[0x200],[0x240],[0x280],[0x300],[0x380]
-
-The address in brackets is the base address of the card.  The IRQ of
-nonexistent cards can be set to 0.  If an IRQ of a card that does exist is set
-to 0, the driver will attempt to guess at the correct IRQ.  For example, to set
-the IRQ of the card at address 0x300 to 12, the insmod command would be:
-
-insmod esp irq=0,0,0,0,0,0,12,0
-
-The custom divisor can be set by using the divisor= option.  The format is the
-same as for the irq= option.  Each divisor value is a series of hex digits,
-with each digit representing the divisor to use for a corresponding port.  The
-divisor value is constructed RIGHT TO LEFT.  Specifying a nonzero divisor value
-will automatically set the spd_cust flag.  To calculate the divisor to use for
-a certain baud rate, divide the port's base baud (generally 921600) by the
-desired rate.  For example, to set the divisor of the primary port at 0x300 to
-4 and the divisor of the secondary port at 0x308 to 8, the insmod command would
-be:
-
-insmod esp divisor=0,0,0,0,0,0,0x84,0
-
-The dma= option can be used to set the DMA channel.  The channel can be either
-1 or 3.  Specifying any other value will force the driver to use PIO mode.
-For example, to set the DMA channel to 3, the insmod command would be:
-
-insmod esp dma=3
-
-The rx_trigger= and tx_trigger= options can be used to set the FIFO trigger
-levels.  They specify when the ESP card should send an interrupt.  Larger
-values will decrease the number of interrupts; however, a value too high may
-result in data loss.  Valid values are 1 through 1023, with 768 being the
-default.  For example, to set the receive trigger level to 512 bytes and the
-transmit trigger level to 700 bytes, the insmod command would be:
-
-insmod esp rx_trigger=512 tx_trigger=700
-
-The flow_off= and flow_on= options can be used to set the hardware flow off/
-flow on levels.  The flow on level must be lower than the flow off level, and
-the flow off level should be higher than rx_trigger.  Valid values are 1
-through 1023, with 1016 being the default flow off level and 944 being the
-default flow on level.  For example, to set the flow off level to 1000 bytes
-and the flow on level to 935 bytes, the insmod command would be:
-
-insmod esp flow_off=1000 flow_on=935
-
-The rx_timeout= option can be used to set the receive timeout value.  This
-value indicates how long after receiving the last character that the ESP card
-should wait before signalling an interrupt.  Valid values are 0 though 255,
-with 128 being the default.  A value too high will increase latency, and a
-value too low will cause unnecessary interrupts.  For example, to set the
-receive timeout to 255, the insmod command would be:
-
-insmod esp rx_timeout=255
-
-The pio_threshold= option sets the threshold (in number of characters) for
-using PIO mode instead of DMA mode.  For example, if this value is 32,
-transfers of 32 bytes or less will always use PIO mode.
-
-insmod esp pio_threshold=32
-
-Multiple options can be listed on the insmod command line by separating each
-option with a space.  For example:
-
-insmod esp dma=3 trigger=512
-
-The esp module can be automatically loaded when needed.  To cause this to
-happen, add the following lines to /etc/modprobe.conf (replacing the last line
-with options for your configuration):
-
-alias char-major-57 esp
-alias char-major-58 esp
-options esp irq=0,0,0,0,0,0,3,0 divisor=0,0,0,0,0,0,0x4,0
-
-You may also need to run 'depmod -a'.
-
-Devices must be created manually.  To create the devices, note the output from
-the module after it is inserted.  The output will appear in the location where
-kernel messages usually appear (usually /var/adm/messages).  Create two devices
-for each 'tty' mentioned, one with major of 57 and the other with major of 58.
-The minor number should be the same as the tty number reported.  The commands
-would be (replace ? with the tty number):
-
-mknod /dev/ttyP? c 57 ?
-mknod /dev/cup? c 58 ?
-
-For example, if the following line appears:
-
-Oct 24 18:17:23 techno kernel: ttyP8 at 0x0140 (irq = 3) is an ESP primary port
-
-...two devices should be created:
-
-mknod /dev/ttyP8 c 57 8
-mknod /dev/cup8 c 58 8
-
-You may need to set the permissions on the devices:
-
-chmod 666 /dev/ttyP*
-chmod 666 /dev/cup*
-
-The ESP module and the serial module should not conflict (they can be used at
-the same time).  After the ESP module has been loaded the ports on the ESP card
-will no longer be accessible by the serial driver.
-
-If I/O errors are experienced when accessing the port, check for IRQ and DMA
-conflicts ('cat /proc/interrupts' and 'cat /proc/dma' for a list of IRQs and
-DMAs currently in use).
-
-Enjoy!
-Andrew J. Robinson <arobinso@nyx.net>