Author: wmb Date: 2009-04-25 06:25:27 +0200 (Sat, 25 Apr 2009) New Revision: 1158
Modified: cpu/x86/pc/olpc/via/smbus.fth Log: Via SMBUS driver - made it work, added some access modes.
Modified: cpu/x86/pc/olpc/via/smbus.fth =================================================================== --- cpu/x86/pc/olpc/via/smbus.fth 2009-04-23 08:20:15 UTC (rev 1157) +++ cpu/x86/pc/olpc/via/smbus.fth 2009-04-25 04:25:27 UTC (rev 1158) @@ -1,12 +1,24 @@ -h# xxx constant smbus-io-base -: smb-reg@ ( reg# -- value ) smbus-io-base + c@ ; -: smb-reg! ( value reg# -- ) smbus-io-base + c! ; +purpose: Driver for SMBUS controller in Via chipset +\ See license at end of file
-: smb-hostdata0@ ( -- byte ) 5 smb-reg@ ; -: smb-hostdata0! ( byte -- ) 5 smb-reg! ; -: smb-hostctl! ( byte -- ) 2 smb-reg! ; -: smb-hostcmd! ( byte -- ) 3 smb-reg! ; -: smb-xmitadr! ( byte -- ) 4 smb-reg! ; +: smb-reg@ ( reg# -- value ) smbus-io-base + pc@ ; +: smb-reg! ( value reg# -- ) smbus-io-base + pc! ; + +0 value smbus-target + +\ Register 1 is slave status; we don't use it +: smb-hoststat@ ( -- byte ) 0 smb-reg@ ; \ Various status bits - busy bit is bit 0 +: smb-hoststat! ( byte -- ) 0 smb-reg! ; \ Lots of Write 1 to Clear bits herein +: smb-hostctl! ( byte -- ) 2 smb-reg! ; \ Write this register to start the transaction +: smb-hostcmd@ ( -- byte ) 2 smb-reg@ ; \ Reads reset the block data counter +: smb-hostcmd! ( byte -- ) 3 smb-reg! ; \ Send in protocol Command Field +: smb-xmitadr! ( byte -- ) 4 smb-reg! ; \ Target address +: smb-hostdata0! ( byte -- ) 5 smb-reg! ; \ Data0 out +: smb-hostdata0@ ( -- byte ) 5 smb-reg@ ; \ Data0 in +: smb-hostdata1! ( byte -- ) 6 smb-reg! ; \ Data1 out +: smb-hostdata1@ ( -- byte ) 6 smb-reg@ ; \ Data1 in +: smb-blockdata! ( byte -- ) 7 smb-reg! ; \ Block data out +: smb-blockdata@ ( -- byte ) 7 smb-reg@ ; \ Block data in : smbus-delay ( -- ) 1 us ; : smbus-wait ( -- ) d# 1,000,000 0 do @@ -15,44 +27,118 @@ loop ." SMBUS timeout" cr ; -: smbus-reset ( -- ) - h# ff 0 smb-reg! - 0 smb-hostdata0! \ Clear host data port - smbus-wait + +: smbus-cmd ( cmd -- ) + h# 40 or smb-hostctl! ( ) \ 40 is go bit + smbus-wait ( ) + smb-hoststat@ ( stat ) + dup h# 9c and if ( stat ) + ." SMBUS error:" ( stat ) + dup h# 80 and if ." PEC" then + dup h# 10 and if ." FailedBusTransaction" then + dup h# 08 and if ." Collision" then + dup h# 04 and if ." DeviceError" then + cr ( stat ) + then ( stat ) + drop ( ) + h# 9e smb-hoststat! ( ) \ Clear all status bits ; -: smb-fill ( adr len -- ) + +\ Bracket groups of SMBUS usage with smbus-acquire ... smbus-release +: smbus-acquire ( target -- ) + 2* to smbus-target + + \ We don't do the real semaphore thing because we "own" the machine exclusively + h# ff smb-hoststat! \ Clear all errors, plus the ownership semaphore + smbus-wait ;
-: ics-value0 ( -- adr len dev ) - " "(0d 00 3f cd 7f bf 1a 2a 01 0f 0b 80 8d 9b)" h# d2 +\ Release semaphore so it will read back as 0 the next time someone looks +: smbus-release ( -- ) h# 40 smb-hoststat! ; + +: smbus-write ( adr len offset -- ) \ Up to 32 bytes + smbus-target smb-xmitadr! ( adr len offset ) + smb-hostcmd! ( adr len ) \ Starting offset + dup smb-hostdata0! ( adr len ) \ Length + smb-hoststat@ drop ( adr len ) \ Reset block transfer counter + bounds ?do i c@ smb-blockdata! loop ( ) \ Copy data to chip + h# 34 smbus-cmd ( ) \ I2C block command ; -: ics-value1 ( -- adr len dev ) - " "(08 ff 3f 00 00 ff ff ff ff)" h# d4 +: smbus-read ( adr maxlen offset -- actlen ) \ Up to 32 bytes + smbus-target 1 or smb-xmitadr! ( adr maxlen offset ) + smb-hostcmd! ( adr maxlen ) \ Starting offset + h# 34 smbus-cmd ( adr maxlen ) \ I2C block command + smb-hostdata0@ min ( adr actlen ) \ Number of bytes returned + smb-hoststat@ drop ( adr actlen ) \ Reset block transfer counter + tuck bounds ?do smb-blockdata@ i c! loop ( actlen ) \ Copy data from chip ; -: smbus-write ( adr len dev -- ) - smbus-reset - 0 smb-reg@ drop \ Read to reset block transfer counter - dup smb-xmitadr! ( adr len ) \ Set transmit address - tuck bounds ?do i c@ 7 smb-reg! loop ( len ) - 0 smb-hostcmd! ( len ) \ Host command - smb-hostdata0! ( ) \ Length - h# 74 smb-hostctl! ( ) - smbus-wait ( ) - smbus-reset ( ) + +: smbus-b! ( byte offset -- ) + smbus-target smb-xmitadr! ( byte offset ) + smb-hostcmd! ( byte ) + smb-hostdata0! ( ) + h# 8 smbus-cmd ( ) ; -: get-spd-data ( offset dimm -- byte ) - smbus-reset - 7 and 2* h# a1 or ( offset dev ) - smb-xmitadr! ( offset ) - smb-hstcmd! ( ) - h# 48 smb-hstctl! ( ) - smbus-wait - smb-hostdata0@ ( byte ) +: smbus-b@ ( offset -- byte ) + smbus-target 1 or smb-xmitadr! ( offset ) + smb-hostcmd! ( ) +\ 0 smb-hostdata0! ( ) \ Clear host data port + 8 smbus-cmd ( ) \ byte data command + smb-hostdata0@ ( byte ) ; + +: smbus-w! ( word offset -- ) + smbus-target smb-xmitadr! ( word offset ) + smb-hostcmd! ( word ) + wbsplit ( low high ) + smb-hostdata1! ( low ) + smb-hostdata0! ( ) + h# c smbus-cmd ( ) \ Word data command +; +: smbus-w@ ( offset -- word ) + smbus-target 1 or smb-xmitadr! ( offset ) + smb-hostcmd! ( ) +\ 0 smb-hostdata0! ( ) \ Clear host data port + h# c smbus-cmd ( ) \ Word data command + smb-hostdata0@ ( low ) + smb-hostdata1@ ( high ) + bwjoin ( word ) +; + : enable-smbus ( -- ) h# 8894 config-b@ h# 80 invert and h# 8894 config-b! \ Clock from 14 MHz divider smbus-io-base 1 or h# 88d0 config-w! 5 h# 88d2 config-b! \ Clock source (bit meaning is unclear), enable SMBUS HC 3 h# 8804 config-w! \ Enable in PCI command register - smbus-reset + smbus-release ; + +: get-spd-data ( offset dimm -- byte ) + 7 and h# 50 or smbus-acquire ( offset ) \ DIMMs are IDs 50-57 + smbus-b@ + smbus-release +; + +\ LICENSE_BEGIN +\ Copyright (c) 2009 FirmWorks +\ +\ Permission is hereby granted, free of charge, to any person obtaining +\ a copy of this software and associated documentation files (the +\ "Software"), to deal in the Software without restriction, including +\ without limitation the rights to use, copy, modify, merge, publish, +\ distribute, sublicense, and/or sell copies of the Software, and to +\ permit persons to whom the Software is furnished to do so, subject to +\ the following conditions: +\ +\ The above copyright notice and this permission notice shall be +\ included in all copies or substantial portions of the Software. +\ +\ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +\ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +\ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +\ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +\ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +\ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +\ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +\ +\ LICENSE_END
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