ssi: Support for multiple attached devices

Removed assertion that only one device is attached to the SSI bus.

When multiple devices are attached, all slaves have their transfer function
called for transfers. Each device is responsible for knowing whether or not its
CS is active, and if not returning 0. The returned data is the logical or of
all responses from the (mulitple) devices.

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
Acked-by: Peter Maydell <peter.maydell@linaro.org>
ssi: Implemented CS behaviour

Added default CS behaviour for SSI slaves. SSI devices can set a property
to enable CS behaviour which will create a GPIO on the device which is the
CS. Tristating of the bus on SSI transfers is implemented.

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
Acked-by: Peter Maydell <peter.maydell@linaro.org>
ssi: Added create_slave_no_init()

Slave creation function that can be used to create an SSI slave without
qdev_init() being called. This give machine models a chance to set properties.

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
Acked-by: Peter Maydell <peter.maydell@linaro.org>
qdev: allow multiple qdev_init_gpio_in() calls

Allow multiple qdev_init_gpio_in() calls for the one device. The first call will
define GPIOs 0-N-1, the next GPIOs N- ... . Allows different GPIOs to be handled
with different handlers. Needed when two levels of the QOM class heirachy both
define GPIO functionality, as a single GPIO handler with an index selecter is
not possible.

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
stellaris: Removed SSI mux

Removed the explicit SSI mux and wired the CS line directly up to the SSI
devices.

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
hw: Added generic FIFO API.

Added a FIFO API that can be used to create and operate byte FIFOs.

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
m25p80: Initial implementation of SPI flash device

Added device model for m25p80 style SPI flash family.

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
xilinx_spi: Initial impl. of Xilinx SPI controller

Device model for xilinx XPS SPI controller (v2.0)

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
petalogix-ml605: added SPI controller with n25q128

Added SPI controller to the reference design, with two n25q128 spi-flashes
connected.

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
Acked-by: Peter Maydell <peter.maydell@linaro.org>
xilinx_spips: Xilinx Zynq SPI cntrlr device model

Added device model for the Xilinx Zynq SPI controller (SPIPS).

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
Acked-by: Peter Maydell <peter.maydell@linaro.org>
xilinx_zynq: Added SPI controllers + flashes

Added the two SPI controllers to the zynq machine model. Attached two SPI flash
devices to each controller.

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
Acked-by: Peter Maydell <peter.maydell@linaro.org>
MAINTAINERS: Added maintainerships for SSI

Added maintainership for SSI, M25P80 and the Xilinx SPI controllers.

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
Acked-by: Peter Maydell <peter.maydell@linaro.org>
ssi: Add slave autoconnect helper

Added helper function to automatically connect SPI slaves based on the QOM child
nodes of a device. A SSI master device can call this routine to automatically
hook-up all child nodes to its SPI bus.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Acked-by: Peter Maydell <peter.maydell@linaro.org>
configure: Tidy up remnants of non-64-bit physaddrs

Tidy up some remnants of code to support non-64-bit physaddrs
which were accidentally omitted from commit 4be403c8.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
sheepdog: use bool for boolean variables

This improves readability.

Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
vnc: fix "info vnc" with "-vnc ..., reverse=on"

When reverse connection is in use, there is no active VNC server
socket.  Because of this, getsockopt(-1, ...) is attempted and
the following error is emitted:

    $ socat TCP-LISTEN:5900,reuseaddr TCP-LISTEN:5901,reuseaddr &
    $ x86_64-softmmu/qemu-system-x86_64 -vnc localhost:5900,reverse -monitor stdio
    QEMU 1.2.50 monitor - type 'help' for more information
    (qemu) info vnc
    An undefined error has occurred

Because however the host, family, service and auth fields are
optional, we can just exit if there is no active server socket.

    $ x86_64-softmmu/qemu-system-x86_64 -vnc localhost:5900,reverse -monitor stdio
    QEMU 1.2.50 monitor - type 'help' for more information
    (qemu) info vnc
    Server:
    Client:
         address: 127.0.0.1:5900
      x509_dname: none
        username: none

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>