2013/2/19 Kuo-Jung Su <dant...@gmail.com>: > 2013/2/18 Stefan Hajnoczi <stefa...@gmail.com>: >> On Mon, Feb 18, 2013 at 05:44:38PM +0800, Kuo-Jung Su wrote: >>> 2013/2/18 Stefan Hajnoczi <stefa...@gmail.com>: >>> > On Wed, Feb 06, 2013 at 05:45:19PM +0800, Kuo-Jung Su wrote: >>> >> From: Kuo-Jung Su <dant...@faraday-tech.com> >>> >> >>> >> The FTMAC110 is an Ethernet controller that provides AHB master >>> >> capability >>> >> and is in full compliance with the IEEE 802.3 10/100 Mbps specifications. >>> >> Its DMA controller handles all data transfers between system memory >>> >> and on-chip memories. >>> >> It supports half-word data transfer for Linux. However it has a weird DMA >>> >> alignment issue: >>> >> >>> >> (1) Tx DMA Buffer Address: >>> >> 1 bytes aligned: Invalid >>> >> 2 bytes aligned: O.K >>> >> 4 bytes aligned: O.K >>> >> >>> >> (2) Rx DMA Buffer Address: >>> >> 1 bytes aligned: Invalid >>> >> 2 bytes aligned: O.K >>> >> 4 bytes aligned: Invalid (It means 0x0, 0x4, 0x8, 0xC are invalid) >>> >> >>> >> Signed-off-by: Kuo-Jung Su <dant...@faraday-tech.com> >>> >> --- >>> >> hw/arm/Makefile.objs | 1 + >>> >> hw/arm/faraday_a360.c | 10 + >>> >> hw/arm/ftmac110.c | 681 >>> >> +++++++++++++++++++++++++++++++++++++++++++++++++ >>> >> hw/arm/ftmac110.h | 131 ++++++++++ >>> >> 4 files changed, 823 insertions(+) >>> >> create mode 100644 hw/arm/ftmac110.c >>> >> create mode 100644 hw/arm/ftmac110.h >>> > >>> > Hi Kuo-Jung, >>> > Is there a datasheet and/or driver programming guide for this Ethernet >>> > controller? >>> > >>> >>> The datasheet distribution is prohibited in Faraday, while it's absolutely >>> O.K >>> to deliver software codes along with register description. >>> >>> So, I can't share the datasheets with you, but I can add register >>> description >>> to the source files. Is this what you need? >> >> I'm asking because I'd like to confirm that the device keeps checking >> for available receive descriptors via DMA reads (owner bit) and there is >> no hw register access to kick the Ethernet controller? >> > > In a descriptor based ethernet MAC, there is usually a dedicated > register to kick-off DMA > engine, and of course, FTMAC110/FTGMAC100 has such register, too. > > They are: > > 1. ftgmac100: > 1-1. REG_TXPD (0x18): Kick-off Tx DMA engine > 1-2. REG_RXPD (0x1c): Kick-off Rx DMA engine > 1-3. REG_HPTXPD (0x28): Kick-off High Priority Tx DMA engine > > 2. ftmac110: > 2-1. REG_TXPD (0x18): Kick-off Tx DMA engine > 2-2. REG_RXPD (0x1c): Kick-off Rx DMA engine > > Writing an arbitrary value to these registers would trigger the > corresponding DMA engine. > >> You work at Faraday, so maybe you have the definitive answer to this :). >> >> Stefan
If you're looking for a basic example code, I'll recommend the u-boot drivers, The files are available from my own github: https://github.com/dantesu1218/u-boot/blob/master/drivers/net/ftgmac100.c https://github.com/dantesu1218/u-boot/blob/master/drivers/net/ftmac110.c > > > > -- > Best wishes, > Kuo-Jung Su -- Best wishes, Kuo-Jung Su
