Question about GPIO bitbang MII

[Aleksandr Rybalko]

On Fri, 7 Oct 2011 10:34:58 +0800
dave jones <s.dave.jones at gmail.com> wrote:

>> Hi,
>> 
>> Does FreeBSD have gpio bitbang api for MII? If not, any driver in
>> tree using gpio-bitbang mii that I can refer to? Thanks.
>> It seems like OpenBSD, NetBSD and Linux have added support to gpio
>> bitbang mii, and it's useful for porting embedded devices.
>> 
>> Best regards,
>> Dave.

Hi Dave,

you can try my script for now :) (Attached as text)
then we will do something with that problem.
I'm not sure that script works fine, because i was use it for detect is
attached device MDIO controlled or I2C.

BTW, which device use MDIO attached to GPIO?
And this is PHY or switch, if second take a look on
http://zrouter.org/hg/FreeBSD/head/file/03dd18c85162/head/sys/dev/switch

######################### bitbanged MDIO
#!/bin/sh

mdc="x"
mdio="x"
lmdc="x"
lmdio="x"

phy=$1
reg=$2

DATA=7
CLOCK=6

out=0;

append()
{
    local c=$1
    local d=$2

    if [ ${c} = "X" ]; then c=${lmdc}; fi
    if [ ${d} = "X" ]; then d=${lmdio}; fi
    mdc="${mdc}${c}"
    mdio="${mdio}${d}"
    lmdc="${c}"
    lmdio="${d}"

}

alias gp='gpioctl -q -f /dev/gpioc0'
alias d0='gp ${DATA} 0 > /dev/null; append X _'
alias d1='gp ${DATA} 1 > /dev/null; append X T'
alias c0='gp ${CLOCK} 0 > /dev/null; append _ X'
alias c1='gp ${CLOCK} 1 > /dev/null; append T X'
alias dIN='gp -c ${DATA} IN > /dev/null; append X "<"'
alias dOUT='gp -c ${DATA} OUT > /dev/null; append X ">"'
alias cIN='gp -c ${CLOCK} IN > /dev/null; append ">" X'
alias cOUT='gp -c ${CLOCK} OUT > /dev/null; append ">" X'
alias dget='gp -g ${DATA}'

#SMI send 1
SMI_1()
{
	d1;
	c1;
	c0;
}

#SMI send 0
SMI_0()
{
	d0;
	c1;
	c0;
}
 
ReadMSIO()
{
	local phyad=$1;
	local regad=$2;
	i=0
	while true; do
		SMI_1;
		i=$(( ${i} + 1))
		if [ ${i} -gt 31 ]; then
			break
		fi
	done

	# 01 # send start
	SMI_0;
	SMI_1;
	# 10 # opcode
	SMI_1;
	SMI_0;

	i=0x10
	while true; do
		if [ $(( ${phyad} & ${i} )) = 0 ]; then
			SMI_0;
		else
			SMI_1;
		fi

		i=$(( ${i} >> 1 ))
		if [ ${i} = 0 ]; then
			break
		fi
	done

	i=0x10
	while true; do
		if [ $(( ${regad} & ${i} )) = 0 ]; then
			SMI_0;
		else
			SMI_1;
		fi

		i=$(( ${i} >> 1 ))
		if [ ${i} = 0 ]; then
			break
		fi
	done

	# #10 # send turn around
	SMI_1;
	SMI_0;

	i=15
	out=0
	dIN;
	while true; do
		c1;
		dinput=`gp -q -g ${DATA}`;
		append X ${dinput}
		append X '<'
		c0;
		out=$(( ${out} | (${dinput} << ${i}) ))

		if [ ${i} = 0 ]; then
			break
		fi
		i=$(( ${i} - 1 ))
	done
	dOUT;
}

dump()
{
    echo
    echo
    echo " mdc pin${CLOCK} ${mdc}"
    echo "mdio pin${DATA} ${mdio}"
    echo
    echo
    echo
    echo
}

cOUT;
c0;
dOUT;
d0;

out=0
ReadMDIO ${phy} ${reg}
printf "P=0x%02x R=0x%02x: 0x%04x\n" ${phy} ${reg} ${out}
dIN;
cIN;

dump

######################### END bitbanged MDIO



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WBW
-- 
Alexandr Rybalko <ray at dlink.ua> 
aka Alex RAY <ray at ddteam.net>