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[rpi] Add SDHOST device driver for Raspberry Pi

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SDHOST is another SD controller that is present on Raspberry Pi (the
other one is SDHC and handled by bcm2835_sdhci driver). Both
controllers are capable of providing interface to SD card, actual
configuration can be set in dtb file. At the moment custom DTBs for
RPi/RPi2 have sdhost node disabled. On RPi3 sdhost is disabled in
snapshot images by applying mmc.dtbo overlay. To enalbe both devices
user has to edit config.txt on FAT partition and remove or comment
"dtoverlay=mmc" line.

When no overlay applied on RPi3 SDHOST controls SD card and SDHC
interface can be used for SDIO. mmc.dtbo overlay disables SDHOST node
and switches SD card over to SDHC.  Likewise sdhost.dtbo overlay (not
currently included in snapshot image, but can be obtained from firmare
repo[1]) disabled SDHC node and switch SD card over to SDHOST.

[1] https://github.com/raspberrypi/firmware/tree/master/boot/overlays

Submitted by:	Klaus P. Ohrhallinger <k@7he.at>
Differential Revision:	https://reviews.freebsd.org/D14168
This commit is contained in:
gonzo 2018-06-28 21:14:33 +00:00
parent 3008082ba5
commit 0dbaf73ea1
3 changed files with 1303 additions and 0 deletions
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1301
sys/arm/broadcom/bcm2835/bcm2835_sdhost.c Normal file
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1
sys/arm/broadcom/bcm2835/files.bcm283x
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@ -12,6 +12,7 @@ arm/broadcom/bcm2835/bcm2835_machdep.c optional platform
arm/broadcom/bcm2835/bcm2835_mbox.c standard
arm/broadcom/bcm2835/bcm2835_rng.c optional random
arm/broadcom/bcm2835/bcm2835_sdhci.c optional sdhci
arm/broadcom/bcm2835/bcm2835_sdhost.c optional sdhci
arm/broadcom/bcm2835/bcm2835_spi.c optional bcm2835_spi
arm/broadcom/bcm2835/bcm2835_vcio.c standard
arm/broadcom/bcm2835/bcm2835_wdog.c standard

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sys/conf/files.arm64
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@ -80,6 +80,7 @@ arm/broadcom/bcm2835/bcm2835_intr.c optional soc_brcm_bcm2837 fdt
arm/broadcom/bcm2835/bcm2835_mbox.c optional soc_brcm_bcm2837 fdt
arm/broadcom/bcm2835/bcm2835_rng.c optional random soc_brcm_bcm2837 fdt
arm/broadcom/bcm2835/bcm2835_sdhci.c optional sdhci soc_brcm_bcm2837 fdt
arm/broadcom/bcm2835/bcm2835_sdhost.c optional sdhci soc_brcm_bcm2837 fdt
arm/broadcom/bcm2835/bcm2835_spi.c optional bcm2835_spi soc_brcm_bcm2837 fdt
arm/broadcom/bcm2835/bcm2835_vcio.c optional soc_brcm_bcm2837 fdt
arm/broadcom/bcm2835/bcm2835_wdog.c optional soc_brcm_bcm2837 fdt