Using GPIO

Fri May 16 18:15:31 EST 2008

> 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 at 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=ttyUL0,115200 rw root=/dev/nfs ip=bootp
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=496640)
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 = 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=254
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=2
mice: PS/2 mouse device common for all mice
xilinx_iic.0 #0 at 0x81600000 mapped to 0xC9020000, irq=4
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 = 24, Receive Threshold = 4
eth0: XLlTemac: Send Wait bound = 254, Receive Wait bound = 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=eth0, addr=192.168.1.200, mask=255.255.255.0, gw=192.168.1.185,
     host=genepy, domain=, nis-domain=(none),
     bootserver=192.168.1.185, rootserver=192.168.1.185, 
rootpath=/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=32
CONFIG_MMU=y
CONFIG_GENERIC_HARDIRQS=y
CONFIG_RWSEM_XCHGADD_ALGORITHM=y
CONFIG_ARCH_HAS_ILOG2_U32=y
CONFIG_GENERIC_HWEIGHT=y
CONFIG_GENERIC_CALIBRATE_DELAY=y
CONFIG_PPC=y
CONFIG_PPC32=y
CONFIG_GENERIC_NVRAM=y
CONFIG_GENERIC_FIND_NEXT_BIT=y
CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=y
CONFIG_ARCH_MAY_HAVE_PC_FDC=y
CONFIG_GENERIC_BUG=y
CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
CONFIG_EXPERIMENTAL=y
CONFIG_BROKEN_ON_SMP=y
CONFIG_INIT_ENV_ARG_LIMIT=32
CONFIG_LOCALVERSION=""
CONFIG_LOG_BUF_SHIFT=14
CONFIG_NAMESPACES=y
CONFIG_CC_OPTIMIZE_FOR_SIZE=y
CONFIG_SYSCTL=y
CONFIG_SYSCTL_SYSCALL=y
CONFIG_KALLSYMS=y
CONFIG_HOTPLUG=y
CONFIG_PRINTK=y
CONFIG_BUG=y
CONFIG_ELF_CORE=y
CONFIG_COMPAT_BRK=y
CONFIG_BASE_FULL=y
CONFIG_FUTEX=y
CONFIG_ANON_INODES=y
CONFIG_EPOLL=y
CONFIG_SIGNALFD=y
CONFIG_TIMERFD=y
CONFIG_EVENTFD=y
CONFIG_SHMEM=y
CONFIG_VM_EVENT_COUNTERS=y
CONFIG_SLAB=y
CONFIG_HAVE_OPROFILE=y
CONFIG_HAVE_KPROBES=y
CONFIG_PROC_PAGE_MONITOR=y
CONFIG_SLABINFO=y
CONFIG_RT_MUTEXES=y
CONFIG_BASE_SMALL=0
CONFIG_BLOCK=y
CONFIG_IOSCHED_NOOP=y
CONFIG_DEFAULT_NOOP=y
CONFIG_DEFAULT_IOSCHED="noop"
CONFIG_CLASSIC_RCU=y
CONFIG_40x=y
CONFIG_PPC_DCR_NATIVE=y
CONFIG_PPC_DCR=y
CONFIG_KEXEC=y
CONFIG_4xx=y
CONFIG_XILINX_ML405=y
CONFIG_IBM405_ERR77=y
CONFIG_IBM405_ERR51=y
CONFIG_XILINX_MLxxx=y
CONFIG_XILINX_VIRTEX_4_FX=y
CONFIG_XILINX_VIRTEX=y
CONFIG_XILINX_EMBED_CONFIG=y
CONFIG_EMBEDDEDBOOT=y
CONFIG_PPC_GEN550=y
CONFIG_UART0_TTYS0=y
CONFIG_NOT_COHERENT_CACHE=y
CONFIG_ARCH_POPULATES_NODE_MAP=y
CONFIG_HZ_300=y
CONFIG_HZ=300
CONFIG_PREEMPT_VOLUNTARY=y
CONFIG_SELECT_MEMORY_MODEL=y
CONFIG_FLATMEM_MANUAL=y
CONFIG_FLATMEM=y
CONFIG_FLAT_NODE_MEM_MAP=y
CONFIG_SPLIT_PTLOCK_CPUS=4
CONFIG_ZONE_DMA_FLAG=1
CONFIG_BOUNCE=y
CONFIG_VIRT_TO_BUS=y
CONFIG_BINFMT_ELF=y
CONFIG_CMDLINE_BOOL=y
CONFIG_CMDLINE="console=ttyUL0,115200 rw root=/dev/nfs ip=bootp"
CONFIG_ISA_DMA_API=y
CONFIG_ZONE_DMA=y
CONFIG_HIGHMEM_START=0xfe000000
CONFIG_LOWMEM_SIZE=0x30000000
CONFIG_KERNEL_START=0xc0000000
CONFIG_TASK_SIZE=0x80000000
CONFIG_CONSISTENT_START=0xff100000
CONFIG_CONSISTENT_SIZE=0x00200000
CONFIG_BOOT_LOAD=0x00400000
CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_PACKET_MMAP=y
CONFIG_UNIX=y
CONFIG_INET=y
CONFIG_IP_FIB_HASH=y
CONFIG_IP_PNP=y
CONFIG_IP_PNP_DHCP=y
CONFIG_IP_PNP_BOOTP=y
CONFIG_TCP_CONG_CUBIC=y
CONFIG_DEFAULT_TCP_CONG="cubic"
CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
CONFIG_STANDALONE=y
CONFIG_PREVENT_FIRMWARE_BUILD=y
CONFIG_BLK_DEV=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_XILINX_SYSACE=y
CONFIG_XILINX_DRIVERS=y
CONFIG_NEED_XILINX_LLDMA=y
CONFIG_HAVE_IDE=y
CONFIG_NETDEVICES=y
CONFIG_NETDEV_1000=y
CONFIG_XILINX_LLTEMAC=y
CONFIG_XILINX_LLTEMAC_MARVELL_88E1111_GMII=y
CONFIG_INPUT=y
CONFIG_INPUT_MOUSEDEV=y
CONFIG_INPUT_MOUSEDEV_SCREEN_X=1024
CONFIG_INPUT_MOUSEDEV_SCREEN_Y=768
CONFIG_VT=y
CONFIG_VT_CONSOLE=y
CONFIG_HW_CONSOLE=y
CONFIG_SERIAL_UARTLITE=y
CONFIG_SERIAL_UARTLITE_CONSOLE=y
CONFIG_SERIAL_CORE=y
CONFIG_SERIAL_CORE_CONSOLE=y
CONFIG_UNIX98_PTYS=y
CONFIG_XILINX_GPIO=y
CONFIG_XILINX_HWICAP=y
CONFIG_I2C=y
CONFIG_I2C_BOARDINFO=y
CONFIG_XILINX_IIC=y
CONFIG_SSB_POSSIBLE=y
CONFIG_DUMMY_CONSOLE=y
CONFIG_XILINX_EDK=y
CONFIG_PROC_FS=y
CONFIG_PROC_KCORE=y
CONFIG_PROC_SYSCTL=y
CONFIG_SYSFS=y
CONFIG_CONFIGFS_FS=y
CONFIG_NETWORK_FILESYSTEMS=y
CONFIG_NFS_FS=y
CONFIG_NFS_V3=y
CONFIG_ROOT_NFS=y
CONFIG_LOCKD=y
CONFIG_LOCKD_V4=y
CONFIG_NFS_COMMON=y
CONFIG_SUNRPC=y
CONFIG_MSDOS_PARTITION=y
CONFIG_PLIST=y
CONFIG_HAS_IOMEM=y
CONFIG_HAS_IOPORT=y
CONFIG_HAS_DMA=y
CONFIG_PRINTK_TIME=y
CONFIG_ENABLE_WARN_DEPRECATED=y
CONFIG_ENABLE_MUST_CHECK=y
CONFIG_DEBUG_KERNEL=y
CONFIG_DETECT_SOFTLOCKUP=y
CONFIG_SCHED_DEBUG=y
CONFIG_DEBUG_MUTEXES=y
CONFIG_DEBUG_BUGVERBOSE=y
CONFIG_DEBUG_INFO=y
-- 
Guillaume Dargaud
http://www.gdargaud.net/