Date: Mon, 2 Apr 2018 09:39:19 -0500 From: Eric van Gyzen <eric@vangyzen.net> To: Warner Losh <imp@bsdimp.com>, raul.becker@iki.fi Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: Realtek RTS525A SD card reader Message-ID: <22ca4f05-3e3a-114d-ef95-d974541ee6d8@vangyzen.net> In-Reply-To: <CANCZdfoO2h31RToz73_xaeQR1rbyCTzYCrgiw357mdDnKtzFTA@mail.gmail.com> References: <fdc07dc1-6ada-929b-e3fc-a360e416b1e3@vangyzen.net> <20180401034514.t4idseuyg53gap7g@tardis> <CANCZdfoO2h31RToz73_xaeQR1rbyCTzYCrgiw357mdDnKtzFTA@mail.gmail.com>
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On 04/01/2018 02:06, Warner Losh wrote: > The interface you want to look for is the mmcbr_if.m inteface. In sdhci, > these routines implement the mmc interface: > sdhci_pci.c: DEVMETHOD(mmcbr_update_ios, sdhci_generic_update_ios), > sdhci_pci.c: DEVMETHOD(mmcbr_switch_vccq, sdhci_generic_switch_vccq), > sdhci_pci.c: DEVMETHOD(mmcbr_tune, sdhci_generic_tune), > sdhci_pci.c: DEVMETHOD(mmcbr_retune, sdhci_generic_retune), > sdhci_pci.c: DEVMETHOD(mmcbr_request, sdhci_generic_request), > sdhci_pci.c: DEVMETHOD(mmcbr_get_ro, sdhci_generic_get_ro), > sdhci_pci.c: DEVMETHOD(mmcbr_acquire_host, sdhci_generic_acquire_host), > sdhci_pci.c: DEVMETHOD(mmcbr_release_host, sdhci_generic_release_host), > > rtsz will almost certainly need it's own versions of these routines (which > is why I suggest having your own driver will be simpler: otherwise each of > these routines would be if (rtsz) do_rtsz_stuff(); else do_sdhci_stuff(); > which won't end well and would be uncomittable to FreeBSD. You can see how > other chips implement these methods by grepping for them in the tree. You > may not need a tune/retune if rtsz doesn't support the latest, fastest > cards, for example. Switch vccq may not be needed either. update_ios will > be needed, and request is needed. Acquire and release host may be able to > be done as a dummy routine if there's only one slot. > > I know this is a super-quick gloss of what needs to be done. This mmc part was helpful, since I know nothing about this interface. Thanks! Eric
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