Xilinx SD controller

Features supported by driver

Zynq

• All the HW/IP features are supported by driver

ZynqMP

 

• All the HW/IP features are supported by driver

Missing features, known Issues, limitations

• SD UHS modes support is disabled in the driver currently due to board and silicon dependencies. Not all boards are having 3.0 level shifter

 

Kernel configurations

config MMC_SDHCI_OF_ARASAN
 
        tristate "SDHCI OF support for the Arasan SDHCI controllers"
        depends on MMC_SDHCI_PLTFM
        depends on OF
        help
 
          This selects the Arasan Secure Digital Host Controller Interface
          (SDHCI). This hardware is found e.g. in Xilinx' Zynq SoC.
          If you have a controller with this interface, say Y or M here.
          If unsure, say N.
 
 

<M> Sound card support  --->
 
HID support  --->
[*] USB support  --->
<M> Ultra Wideband devices  --->
<*> MMC/SD/SDIO card support  --->
<M> Sony MemoryStick card support  --->
-*- LED Support  --->
 
 

 --- MMC/SD/SDIO card support
 
[ ]   MMC debugging
[ ]   MMC host clock gating (NEW)
*** MMC/SD/SDIO Card Drivers ***
 <M>   MMC block device driver
(8)     Number of minors per block device (NEW)
[*]     Use bounce buffer for simple hosts
< >   SDIO UART/GPS class support
< >   MMC host test driver
*** MMC/SD/SDIO Host Controller Drivers ***
<*>   Secure Digital Host Controller Interface support
< >     SDHCI support on PCI bus
[*]       Ricoh MMC Controller Disabler
<*>     SDHCI platform and OF driver helper
<*>       SDHCI OF support for the Arasan SDHCI controllers (NEW)
< >   SDHCI support for Fujitsu Semiconductor F_SDH30 (NEW)
< >   TI Flash Media MMC/SD Interface support
< >   MMC/SD driver for Ricoh Bay1Controllers
< >   ENE CB710 MMC/SD Interface support
< >   VIA SD/MMC Card Reader Driver
 
 
 

Devicetree

SD and eMMC

sdhci@ff160000 {
    compatible = "xlnx,zynqmp-8.9a", "arasan,sdhci-8.9a";
    interrupt-parent = <&gic>;
    interrupts = <0x0 0x30 0x4>;
    reg = <0x0 0xff160000 0x0 0x1000>;
    clock-names = "clk_xin", "clk_ahb";
    xlnx,device_id = <0x0>;
};

sdhci@ff170000 {
    compatible = "xlnx,zynqmp-8.9a", "arasan,sdhci-8.9a";
    interrupt-parent = <&gic>;
    interrupts = <0x0 0x31 0x4>;
    reg = <0x0 0xff170000 0x0 0x1000>;
    clock-names = "clk_xin", "clk_ahb";
    xlnx,device_id = <0x0>;
};

 

Performance

SD card : Sandisk Ultra 16GB SDHC card

Zynq:

High speed

20.54 MB/sec

read speed, tool: hdparm

ZynqMP:

High Speed	19.4 MB/Sec	read speed, tool: hdparm
SDR	SDR104: 76.50MB/sec	read speed, tool: hdparm
DDR	DDR50: 40.68MB/sec	read speed, tool: hdparm

Test Procedure

Read/Write test using File System

mkfs.vfat -F 32 /dev/mmcblk0(p1)
mount /dev/mmcblk0(p1) /mnt
mkdir /mnt/sd
vi /mnt/sd/sd.txt
umount /mnt

Read/Write test using DD commands

dd if=/dev/urandom of=/tmp/data bs=1M count=10
dd if=/tmp/data of=/dev/mmcblk0(p1) bs=1M count=10
dd if=/dev/mmcblk0(p1) of=/tmp/data1 bs=1M count=10
 
md5sum /tmp/data /tmp/data1
(sha values reported by md5sum should be equal for data and data1 files

Create partition using FDISK

List Partitions:
 
-----------------------------------
 
fdisk -l /dev/mmcblk0
 
[ 1307.186442] mmc0: Got data interrupt 0x00000002 even though no data operation was in progress.
 
Disk /dev/mmcblk0: 3947 MB, 3947888640 bytes
 
4 heads, 16 sectors/track, 120480 cylinders
 
Units = cylinders of 64 * 512 = 32768 bytes
 
        Device Boot      Start         End      Blocks  Id System
 
/dev/mmcblk0p1               1           1          24   b Win95 FAT32
 
/dev/mmcblk0p2               2           2          32  83 Linux
 
Create Partition:
 
-----------------------------------
 
fdisk /dev/mmcblk0
 
[ 1344.587085] mmc0: Got data interrupt 0x00000002 even though no data operation was in progress.
 
The number of cylinders for this disk is set to 120480.
 
There is nothing wrong with that, but this is larger than 1024,
 
and could in certain setups cause problems with:
 
1) software that runs at boot time (e.g., old versions of LILO)
 
2) booting and partitioning software from other OSs
 
   (e.g., DOS FDISK, OS/2 FDISK)
 
Command (m for help): n
 
Command action
 
   e   extended
 
   p   primary partition (1-4)
 
p
 
Partition number (1-4): 3
 
First cylinder (3-120480, default 3): 3
 
Last cylinder or +size or +sizeM or +sizeK (3-120480, default 120480): 3
 
Command (m for help): w
 
The partition table has been altered.
 
Calling ioctl() to re-read partition table
 
[ 1832.815341] mmc0: Got data interrupt 0x00000002 even though no data operation was in progress.
 
[ 1832.833339]  mmcblk0: p3
 
Different options:
 
--------------------------------------
 
Command (m for help): m
 
Command Action
 
a       toggle a bootable flag
 
b       edit bsd disklabel
 
c       toggle the dos compatibility flag
 
d       delete a partition
 
l       list known partition types
 
n       add a new partition
 
o       create a new empty DOS partition table
 
p       print the partition table
 
q       quit without saving changes
 
s       create a new empty Sun disklabel
 
t       change a partition's system id
 
u       change display/entry units
 
v       verify the partition table
 
w       write table to disk and exit
 
 
Read/Write using File System:
 
---------------------------------------
 
root@Xilinx-ZynqMP-2015_3:~# mkfs.vfat -F 32 /dev/mmcblk0p3
 
[  598.662380] mmc0: Got data interrupt 0x00000002 even though no data operation was in progress.
 
[  598.686123] mmc0: Got data interrupt 0x00000002 even though no data operation was in progress.
 
root@Xilinx-ZynqMP-2015_3:~# mount /dev/mmcblk0p3 /mnt
 
[  632.450944] mmc0: Got data interrupt 0x00000002 even though no data operation was in progress.
 
[  632.519516] mmc0: Got data interrupt 0x00000002 even though no data operation was in progress.
 
[  632.558846] mmc0: Got data interrupt 0x00000002 even though no data operation was in progress.
 
root@Xilinx-ZynqMP-2015_3:~# mkdir /mnt/sd
root@Xilinx-ZynqMP-2015_3:~# vi /mnt/sd/sd.txt
root@Xilinx-ZynqMP-2015_3:~# umount /mnt

Expected output

Boot log for SD

sdhci: Secure Digital Host Controller Interface driver
sdhci: Copyright(c) Pierre Ossman
sdhci-pltfm: SDHCI platform and OF driver helper
sdhci-arasan ff160000.sdhci: No vmmc regulator found
sdhci-arasan ff160000.sdhci: No vqmmc regulator found
mmc0: SDHCI controller on ff160000.sdhci [ff160000.sdhci] using ADMA 64-bit
sdhci-arasan ff170000.sdhci: No vmmc regulator found
sdhci-arasan ff170000.sdhci: No vqmmc regulator found
mmc1: SDHCI controller on ff170000.sdhci [ff170000.sdhci] using ADMA 64-bit
 
........
 
mmc0: new high speed SDHC card at address 1234
mmcblk0: mmc0:1234 SA04G 3.63 GiB
mmc0: Got data interrupt 0x00000002 even though no data operation was in progress.
mmcblk0: p1
 
.........
 
mmc1: new high speed SDHC card at address aaaa
mmcblk1: mmc1:aaaa SU08G 7.40 GiB
mmcblk1: p1

Boot log for EMMC

mmc0: BKOPS_EN bit is not set
mmc0: new high speed MMC card at address 0001
 
mmcblk0: mmc0:0001 MMC04G 3.57 GiB
mmcblk0boot0: mmc0:0001 MMC04G partition 1 2.00 MiB
mmcblk0boot1: mmc0:0001 MMC04G partition 2 2.00 MiB
mmcblk0rpmb: mmc0:0001 MMC04G partition 3 128 KiB
 
mmcblk0:
 
mmcblk0boot1: unknown partition table
mmcblk0boot0: unknown partition table

 

Mainline Status

The SD driver is currently in sync with mainline kernel 4.9 except the below changes

• add support for switching to UHS-I modes on ZynqMP Platform