Date: Tue, 02 Jul 2013 20:10:18 +0300 From: Alexander Motin <mav@FreeBSD.org> To: Ilya Bakulin <ilya@bakulin.de> Cc: freebsd-arm@freebsd.org, freebsd-embedded@freebsd.org Subject: Re: [PATCH] SDIO support for Globalscale Dreamplug Message-ID: <51D3097A.8010601@FreeBSD.org> In-Reply-To: <20130702145905.GA1847@olymp.kibab.com> References: <20130702145905.GA1847@olymp.kibab.com>
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On 02.07.2013 17:59, Ilya Bakulin wrote: > Hi list, > I'm currently developing a SDIO driver for the Globalscale Dreamplug. > I have taken SDIO patch for Marvell SoC from [1]. > After that I have written some SDIO-related code in sys/dev/mmc/mmc.c, > using OpenBSD SDIO code and the patch from Ben Gray ([2]) as a starting point. > > I have taken Warner's wish to have SDIO code in MMC bus into account, so there > is no extra layer of abstraction in my code, SDIO devices will attach directly > to MMC bus. This makes possible to implement combo cards support in the future, > although I don't support them in my code atm. > > What is already implemented: > * SDIO card detection; > * CIS reading, both common CIS and individual functions' CIS; > * Function enable. > > My questions, need answers before I can move further: > * Where should I store information retrieved from the CIS? > As far as I understand, I should use mmc_ivars structure for that. > But in SDIO case the relationship between MMC bus and SDIO card is 1:1, > and storing the information about the card in mmc_softc sounds like > a good idea -- then I can pass only mmc_softc structure to all functions > that need to work with the attached SDIO card. I think SD world is a terrible mess by itself. I would like to not add more. Functions that suppose card access should take card-specific structure or device as an argument, not a bus ones. > * Should I add any methods to the existing interface files? > > * Are there any devices on the market that use SDIO interface and which > chipsets are supported in FreeBSD? Any Atheros devices? > Adrian, what do you think? > I have only Dreamplug with Marvell SDIO-based WLAN chip, that doesn't have > an opensource driver even for Linux... Recently I've bought EyeFi card hoping it is combined SD+SDIO, but seems like card's WiFi part is completely autonomous and controlled via file access on storage and not really SDIO. I would try to look for SDIO Bluetooth card. I think such ones still could be found on eBay, and I think there are some specifications for that. Though I've never looked inside. > [1] http://people.freebsd.org/~raj/misc/mv_sdio.c > [2] http://lists.freebsd.org/pipermail/freebsd-arm/2012-June/003543.html -- Alexander Motin
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