RE: Using GPIO

From: "John Linn" <John.Linn@xilinx•com>
To: "Guillaume Dargaud" <dargaud@lpsc•in2p3.fr>, <linuxppc-dev@ozlabs•org>
Subject: RE: Using GPIO
Date: Fri, 16 May 2008 10:17:10 -0600	[thread overview]
Message-ID: <20080516161713.9DAAD708056@mail93-wa4.bigfish.com> (raw)
In-Reply-To: <032c01c8b72d$0555cea0$ad289e86@LPSC0173W>

Hi,

Dts files are not used with arch/ppc.  =

In arch/ppc, the drivers that are in the system depend on the
arch/ppc/platforms/4xx/xparameters/xparameters_ml405.h to setup the
addresses of the devices and their configuration.

I looked at the ML405 setup in the git tree and it appears that it would
need to be added to arch/ppc/syslib/virtex_devices.c. The platform data
in virtex_devices.c must include the GPIO for it to be probed correctly.
It should be easy for you to add the data to make it work. =

I see a GPIO in the xparameters*.h for the LEDs. =

Thanks,
John

-----Original Message-----
From: linuxppc-dev-bounces+john.linn=3Dxilinx.com@ozlabs•org
[mailto:linuxppc-dev-bounces+john.linn=3Dxilinx.com@ozlabs•org] On Behalf
Of Guillaume Dargaud
Sent: Friday, May 16, 2008 2:16 AM
To: linuxppc-dev@ozlabs•org
Subject: Re: Using GPIO

> If you're using arch/powerpc, my understanding is that
> CONFIG_XILINX_GPIO needs to be enabled as well as having the right
info
> in the dts file.

I'm using arch/ppc, so excuse my ignorance but what are dts files ?
I see arch/powerpc/boot/dts/ml405.dts in the kernel tree which would
need =

some changes, but it looks like a generated file. Generated by what ?

> If you're using arch/ppc, I believe you just need CONFIG_XILINX_GPIO
> enabled.
> When the system boots up, you see a message on the console when the
GPIO
> driver initializes.

That's what I'm trying to use, but there's no gpio info in the messages.
Here's a copy:

Linux version 2.6.25-rc9 (someone@somewhere•in.summertime) (gcc version =

4.1.2) #27 Thu May 15 18:40:17 CEST 2008
Xilinx Generic PowerPC board support package (Xilinx ML405) (Virtex-4
FX)
Entering add_active_range(0, 0, 32768) 0 entries of 256 used
Zone PFN ranges:
  DMA             0 ->    32768
  Normal      32768 ->    32768
Movable zone start PFN for each node
active PFN ranges
    0:        0 ->    32768
On node 0 totalpages: 32768
  DMA zone: 256 pages used for memmap
  DMA zone: 0 pages reserved
  DMA zone: 32512 pages, LIFO batch:7
  Normal zone: 0 pages used for memmap
  Movable zone: 0 pages used for memmap
Built 1 zonelists in Zone order, mobility grouping on.  Total pages:
32512
Kernel command line: console=3DttyUL0,115200 rw root=3D/dev/nfs ip=3Dbootp
Xilinx INTC #0 at 0x81800000 mapped to 0xFDFFF000
PID hash table entries: 512 (order: 9, 2048 bytes)
Console: colour dummy device 80x25
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Memory: 127872k available (1516k kernel code, 460k data, 80k init, 0k =

highmem)
Calibrating delay loop... 298.40 BogoMIPS (lpj=3D496640)
Mount-cache hash table entries: 512
net_namespace: 152 bytes
NET: Registered protocol family 16
Registering device uartlite:0
Registering device xsysace:0
Fixup MAC address for xilinx_lltemac:0
Registering device xilinx_lltemac:0
Registering device xilinx_iic:0
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 4096 (order: 3, 32768 bytes)
TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
TCP: Hash tables configured (established 4096 bind 4096)
TCP reno registered
io scheduler noop registered (default)
uartlite.0: ttyUL0 at MMIO 0x84000003 (irq =3D 8) is a uartlite
enabled
loop: module loaded
xsysace xsa: Xilinx SystemACE revision 1.0.12
xsysace xsa: capacity: 1014048 sectors
 xsa: xsa1 xsa2
Xilinx SystemACE device driver, major=3D254
xilinx_lltemac xilinx_lltemac.0: MAC address is now  0: a:35: 1: 2: 3
xilinx_lltemac xilinx_lltemac.0: XLlTemac: using DMA mode.
XLlTemac: Dma base address: phy: 0x84600100, virt: 0xc9008100
XLlTemac: buffer descriptor size: 32768 (0x8000)
XLlTemac: Allocating DMA descriptors with kmalloc<6>XLlTemac: =

(buffer_descriptor_init) phy: 0x7ca8000, virt: 0xc7ca8000, size: 0x8000
XTemac: PHY detected at address 7.
eth0: Dropping NETIF_F_SG since no checksum feature.
xilinx_lltemac xilinx_lltemac.0: eth0: Xilinx TEMAC at 0x81C00000 mapped
to =

0xC9004000, irq=3D2
mice: PS/2 mouse device common for all mice
xilinx_iic.0 #0 at 0x81600000 mapped to 0xC9020000, irq=3D4
TCP cubic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
eth0: XLlTemac: Options: 0x3fa
eth0: XLlTemac: allocating interrupt 0 for dma mode tx.
eth0: XLlTemac: allocating interrupt 1 for dma mode rx.
eth0: XLlTemac: speed set to 100Mb/s
eth0: XLlTemac: Send Threshold =3D 24, Receive Threshold =3D 4
eth0: XLlTemac: Send Wait bound =3D 254, Receive Wait bound =3D 254
Sending BOOTP requests . OK
IP-Config: Got BOOTP answer from 192.168.1.185, my address is
192.168.1.200
IP-Config: Complete:
     device=3Deth0, addr=3D192.168.1.200, mask=3D255.255.255.0,
gw=3D192.168.1.185,
     host=3Dgenepy, domain=3D, nis-domain=3D(none),
     bootserver=3D192.168.1.185, rootserver=3D192.168.1.185, =

rootpath=3D/media/rootfs
Looking up port of RPC 100003/2 on 192.168.1.185
Looking up port of RPC 100005/1 on 192.168.1.185
VFS: Mounted root (nfs filesystem).
Freeing unused kernel memory: 80k init
...and the boot proceeds fine.

And a cleaned-up .config:
CONFIG_WORD_SIZE=3D32
CONFIG_MMU=3Dy
CONFIG_GENERIC_HARDIRQS=3Dy
CONFIG_RWSEM_XCHGADD_ALGORITHM=3Dy
CONFIG_ARCH_HAS_ILOG2_U32=3Dy
CONFIG_GENERIC_HWEIGHT=3Dy
CONFIG_GENERIC_CALIBRATE_DELAY=3Dy
CONFIG_PPC=3Dy
CONFIG_PPC32=3Dy
CONFIG_GENERIC_NVRAM=3Dy
CONFIG_GENERIC_FIND_NEXT_BIT=3Dy
CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=3Dy
CONFIG_ARCH_MAY_HAVE_PC_FDC=3Dy
CONFIG_GENERIC_BUG=3Dy
CONFIG_DEFCONFIG_LIST=3D"/lib/modules/$UNAME_RELEASE/.config"
CONFIG_EXPERIMENTAL=3Dy
CONFIG_BROKEN_ON_SMP=3Dy
CONFIG_INIT_ENV_ARG_LIMIT=3D32
CONFIG_LOCALVERSION=3D""
CONFIG_LOG_BUF_SHIFT=3D14
CONFIG_NAMESPACES=3Dy
CONFIG_CC_OPTIMIZE_FOR_SIZE=3Dy
CONFIG_SYSCTL=3Dy
CONFIG_SYSCTL_SYSCALL=3Dy
CONFIG_KALLSYMS=3Dy
CONFIG_HOTPLUG=3Dy
CONFIG_PRINTK=3Dy
CONFIG_BUG=3Dy
CONFIG_ELF_CORE=3Dy
CONFIG_COMPAT_BRK=3Dy
CONFIG_BASE_FULL=3Dy
CONFIG_FUTEX=3Dy
CONFIG_ANON_INODES=3Dy
CONFIG_EPOLL=3Dy
CONFIG_SIGNALFD=3Dy
CONFIG_TIMERFD=3Dy
CONFIG_EVENTFD=3Dy
CONFIG_SHMEM=3Dy
CONFIG_VM_EVENT_COUNTERS=3Dy
CONFIG_SLAB=3Dy
CONFIG_HAVE_OPROFILE=3Dy
CONFIG_HAVE_KPROBES=3Dy
CONFIG_PROC_PAGE_MONITOR=3Dy
CONFIG_SLABINFO=3Dy
CONFIG_RT_MUTEXES=3Dy
CONFIG_BASE_SMALL=3D0
CONFIG_BLOCK=3Dy
CONFIG_IOSCHED_NOOP=3Dy
CONFIG_DEFAULT_NOOP=3Dy
CONFIG_DEFAULT_IOSCHED=3D"noop"
CONFIG_CLASSIC_RCU=3Dy
CONFIG_40x=3Dy
CONFIG_PPC_DCR_NATIVE=3Dy
CONFIG_PPC_DCR=3Dy
CONFIG_KEXEC=3Dy
CONFIG_4xx=3Dy
CONFIG_XILINX_ML405=3Dy
CONFIG_IBM405_ERR77=3Dy
CONFIG_IBM405_ERR51=3Dy
CONFIG_XILINX_MLxxx=3Dy
CONFIG_XILINX_VIRTEX_4_FX=3Dy
CONFIG_XILINX_VIRTEX=3Dy
CONFIG_XILINX_EMBED_CONFIG=3Dy
CONFIG_EMBEDDEDBOOT=3Dy
CONFIG_PPC_GEN550=3Dy
CONFIG_UART0_TTYS0=3Dy
CONFIG_NOT_COHERENT_CACHE=3Dy
CONFIG_ARCH_POPULATES_NODE_MAP=3Dy
CONFIG_HZ_300=3Dy
CONFIG_HZ=3D300
CONFIG_PREEMPT_VOLUNTARY=3Dy
CONFIG_SELECT_MEMORY_MODEL=3Dy
CONFIG_FLATMEM_MANUAL=3Dy
CONFIG_FLATMEM=3Dy
CONFIG_FLAT_NODE_MEM_MAP=3Dy
CONFIG_SPLIT_PTLOCK_CPUS=3D4
CONFIG_ZONE_DMA_FLAG=3D1
CONFIG_BOUNCE=3Dy
CONFIG_VIRT_TO_BUS=3Dy
CONFIG_BINFMT_ELF=3Dy
CONFIG_CMDLINE_BOOL=3Dy
CONFIG_CMDLINE=3D"console=3DttyUL0,115200 rw root=3D/dev/nfs ip=3Dbootp"
CONFIG_ISA_DMA_API=3Dy
CONFIG_ZONE_DMA=3Dy
CONFIG_HIGHMEM_START=3D0xfe000000
CONFIG_LOWMEM_SIZE=3D0x30000000
CONFIG_KERNEL_START=3D0xc0000000
CONFIG_TASK_SIZE=3D0x80000000
CONFIG_CONSISTENT_START=3D0xff100000
CONFIG_CONSISTENT_SIZE=3D0x00200000
CONFIG_BOOT_LOAD=3D0x00400000
CONFIG_NET=3Dy
CONFIG_PACKET=3Dy
CONFIG_PACKET_MMAP=3Dy
CONFIG_UNIX=3Dy
CONFIG_INET=3Dy
CONFIG_IP_FIB_HASH=3Dy
CONFIG_IP_PNP=3Dy
CONFIG_IP_PNP_DHCP=3Dy
CONFIG_IP_PNP_BOOTP=3Dy
CONFIG_TCP_CONG_CUBIC=3Dy
CONFIG_DEFAULT_TCP_CONG=3D"cubic"
CONFIG_UEVENT_HELPER_PATH=3D"/sbin/hotplug"
CONFIG_STANDALONE=3Dy
CONFIG_PREVENT_FIRMWARE_BUILD=3Dy
CONFIG_BLK_DEV=3Dy
CONFIG_BLK_DEV_LOOP=3Dy
CONFIG_XILINX_SYSACE=3Dy
CONFIG_XILINX_DRIVERS=3Dy
CONFIG_NEED_XILINX_LLDMA=3Dy
CONFIG_HAVE_IDE=3Dy
CONFIG_NETDEVICES=3Dy
CONFIG_NETDEV_1000=3Dy
CONFIG_XILINX_LLTEMAC=3Dy
CONFIG_XILINX_LLTEMAC_MARVELL_88E1111_GMII=3Dy
CONFIG_INPUT=3Dy
CONFIG_INPUT_MOUSEDEV=3Dy
CONFIG_INPUT_MOUSEDEV_SCREEN_X=3D1024
CONFIG_INPUT_MOUSEDEV_SCREEN_Y=3D768
CONFIG_VT=3Dy
CONFIG_VT_CONSOLE=3Dy
CONFIG_HW_CONSOLE=3Dy
CONFIG_SERIAL_UARTLITE=3Dy
CONFIG_SERIAL_UARTLITE_CONSOLE=3Dy
CONFIG_SERIAL_CORE=3Dy
CONFIG_SERIAL_CORE_CONSOLE=3Dy
CONFIG_UNIX98_PTYS=3Dy
CONFIG_XILINX_GPIO=3Dy
CONFIG_XILINX_HWICAP=3Dy
CONFIG_I2C=3Dy
CONFIG_I2C_BOARDINFO=3Dy
CONFIG_XILINX_IIC=3Dy
CONFIG_SSB_POSSIBLE=3Dy
CONFIG_DUMMY_CONSOLE=3Dy
CONFIG_XILINX_EDK=3Dy
CONFIG_PROC_FS=3Dy
CONFIG_PROC_KCORE=3Dy
CONFIG_PROC_SYSCTL=3Dy
CONFIG_SYSFS=3Dy
CONFIG_CONFIGFS_FS=3Dy
CONFIG_NETWORK_FILESYSTEMS=3Dy
CONFIG_NFS_FS=3Dy
CONFIG_NFS_V3=3Dy
CONFIG_ROOT_NFS=3Dy
CONFIG_LOCKD=3Dy
CONFIG_LOCKD_V4=3Dy
CONFIG_NFS_COMMON=3Dy
CONFIG_SUNRPC=3Dy
CONFIG_MSDOS_PARTITION=3Dy
CONFIG_PLIST=3Dy
CONFIG_HAS_IOMEM=3Dy
CONFIG_HAS_IOPORT=3Dy
CONFIG_HAS_DMA=3Dy
CONFIG_PRINTK_TIME=3Dy
CONFIG_ENABLE_WARN_DEPRECATED=3Dy
CONFIG_ENABLE_MUST_CHECK=3Dy
CONFIG_DEBUG_KERNEL=3Dy
CONFIG_DETECT_SOFTLOCKUP=3Dy
CONFIG_SCHED_DEBUG=3Dy
CONFIG_DEBUG_MUTEXES=3Dy
CONFIG_DEBUG_BUGVERBOSE=3Dy
CONFIG_DEBUG_INFO=3Dy
-- =

Guillaume Dargaud
http://www.gdargaud.net/

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