[PATCH] xtensa: Architecture support for Tensilica Xtensa Part 1

The attached patches provides part 1 of an architecture implementation for the
Tensilica Xtensa CPU series.

Signed-off-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 258 insertions, 0 deletions

diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
new file mode 100644
index 000000000000..3e89767cea72
--- /dev/null
+++ b/arch/xtensa/Kconfig
@@ -0,0 +1,258 @@
+# For a description of the syntax of this configuration file,
+# see Documentation/kbuild/config-language.txt.
+
+mainmenu "Linux/Xtensa Kernel Configuration"
+
+config FRAME_POINTER
+        bool
+        default n
+
+config XTENSA
+        bool
+        default y
+        help
+          Xtensa processors are 32-bit RISC machines designed by Tensilica
+          primarily for embedded systems.  These processors are both
+          configurable and extensible.  The Linux port to the Xtensa
+          architecture supports all processor configurations and extensions,
+          with reasonable minimum requirements.  The Xtensa Linux project has
+          a home page at <http://xtensa.sourceforge.net/>.
+
+config UID16
+        bool
+        default n
+
+config RWSEM_XCHGADD_ALGORITHM
+        bool
+        default y
+
+config HAVE_DEC_LOCK
+        bool
+        default y
+
+config GENERIC_HARDIRQS
+        bool
+        default y
+
+source "init/Kconfig"
+
+menu "Processor type and features"
+
+choice
+        prompt "Xtensa Processor Configuration"
+        default XTENSA_CPU_LINUX_BE
+
+config XTENSA_CPU_LINUX_BE
+        bool "linux_be"
+        ---help---
+          The linux_be processor configuration is the baseline Xtensa
+          configurations included in this kernel and also used by
+          binutils, gcc, and gdb. It contains no TIE, no coprocessors,
+          and the following configuration options:
+
+          Code Density Option                2 Misc Special Registers
+          NSA/NSAU Instructions              128-bit Data Bus Width
+          Processor ID                       8K, 2-way I and D Caches
+          Zero-Overhead Loops                2 Inst Address Break Registers
+          Big Endian                         2 Data Address Break Registers
+          64 General-Purpose Registers       JTAG Interface and Trace Port
+          17 Interrupts                      MMU w/ TLBs and Autorefill
+          3 Interrupt Levels                 8 Autorefill Ways (I/D TLBs)
+          3 Timers                           Unaligned Exceptions
+endchoice
+
+config MMU
+        bool
+        default y
+
+config XTENSA_UNALIGNED_USER
+        bool "Unaligned memory access in use space"
+        ---help---
+           The Xtensa architecture currently does not handle unaligned
+           memory accesses in hardware but through an exception handler.
+           Per default, unaligned memory accesses are disabled in user space.
+
+           Say Y here to enable unaligned memory access in user space.
+
+config PREEMPT
+        bool "Preemptible Kernel"
+        ---help---
+           This option reduces the latency of the kernel when reacting to
+           real-time or interactive events by allowing a low priority process to
+           be preempted even if it is in kernel mode executing a system call.
+           Unfortunately the kernel code has some race conditions if both
+           CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
+           currently disabled if you are building an SMP kernel.
+
+           Say Y here if you are building a kernel for a desktop, embedded
+           or real-time system.  Say N if you are unsure.
+
+config MATH_EMULATION
+        bool "Math emulation"
+        help
+        Can we use information of configuration file?
+
+config HIGHMEM
+        bool "High memory support"
+
+endmenu
+
+menu "Platform options"
+
+choice
+        prompt "Xtensa System Type"
+        default XTENSA_PLATFORM_ISS
+
+config XTENSA_PLATFORM_ISS
+        bool "ISS"
+        help
+          ISS is an acronym for Tensilica's Instruction Set Simulator.
+
+config XTENSA_PLATFORM_XT2000
+        bool "XT2000"
+        help
+          XT2000 is the name of Tensilica's feature-rich emulation platform.
+          This hardware is capable of running a full Linux distribution.
+
+endchoice
+
+
+config XTENSA_CALIBRATE_CCOUNT
+        bool "Auto calibration of the CPU clock rate"
+        ---help---
+          On some platforms (XT2000, for example), the CPU clock rate can
+          vary.  The frequency can be determined, however, by measuring
+          against a well known, fixed frequency, such as an UART oscillator.
+
+config XTENSA_CPU_CLOCK
+        int "CPU clock rate [MHz]"
+        depends on !XTENSA_CALIBRATE_CCOUNT
+        default "16"
+
+config GENERIC_CALIBRATE_DELAY
+        bool "Auto calibration of the BogoMIPS value"
+        ---help---
+          The BogoMIPS value can easily derived from the CPU frequency.
+
+config CMDLINE_BOOL
+        bool "Default bootloader kernel arguments"
+
+config CMDLINE
+        string "Initial kernel command string"
+        depends on CMDLINE_BOOL
+        default "console=ttyS0,38400 root=/dev/ram"
+        help
+          On some architectures (EBSA110 and CATS), there is currently no way
+          for the boot loader to pass arguments to the kernel. For these
+          architectures, you should supply some command-line options at build
+          time by entering them here. As a minimum, you should specify the
+          memory size and the root device (e.g., mem=64M root=/dev/nfs).
+
+config SERIAL_CONSOLE
+        bool
+        depends on XTENSA_PLATFORM_ISS
+        default y
+
+config XTENSA_ISS_NETWORK
+        bool
+        depends on XTENSA_PLATFORM_ISS
+        default y
+
+endmenu
+
+menu "Bus options"
+
+config PCI
+        bool "PCI support" if !XTENSA_PLATFORM_ISS
+        depends on !XTENSA_PLATFORM_ISS
+        default y
+        help
+          Find out whether you have a PCI motherboard. PCI is the name of a
+          bus system, i.e. the way the CPU talks to the other stuff inside
+          your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
+          VESA. If you have PCI, say Y, otherwise N.
+
+          The PCI-HOWTO, available from
+          <http://www.linuxdoc.org/docs.html#howto>, contains valuable
+          information about which PCI hardware does work under Linux and which
+          doesn't
+
+source "drivers/pci/Kconfig"
+
+config HOTPLUG
+
+        bool "Support for hot-pluggable devices"
+        ---help---
+        Say Y here if you want to plug devices into your computer while
+        the system is running, and be able to use them quickly.  In many
+        cases, the devices can likewise be unplugged at any time too.
+
+        One well known example of this is PCMCIA- or PC-cards, credit-card
+        size devices such as network cards, modems or hard drives which are
+        plugged into slots found on all modern laptop computers.  Another
+        example, used on modern desktops as well as laptops, is USB.
+
+        Enable HOTPLUG and KMOD, and build a modular kernel.  Get agent
+        software (at <http://linux-hotplug.sourceforge.net/>) and install it.
+        Then your kernel will automatically call out to a user mode "policy
+        agent" (/sbin/hotplug) to load modules and set up software needed
+        to use devices as you hotplug them.
+
+source "drivers/pcmcia/Kconfig"
+
+source "drivers/pci/hotplug/Kconfig"
+
+endmenu
+
+menu "Exectuable file formats"
+
+# only elf supported
+config KCORE_ELF
+        bool
+        depends on PROC_FS
+        default y
+        help
+          If you enabled support for /proc file system then the file
+          /proc/kcore will contain the kernel core image in ELF format. This
+          can be used in gdb:
+
+          $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
+
+          This is especially useful if you have compiled the kernel with the
+          "-g" option to preserve debugging information. It is mainly used
+          for examining kernel data structures on the live kernel.
+
+source "fs/Kconfig.binfmt"
+
+endmenu
+
+source "drivers/Kconfig"
+
+source "fs/Kconfig"
+
+menu "Xtensa initrd options"
+        depends on BLK_DEV_INITRD
+
+        config EMBEDDED_RAMDISK
+        bool "Embed root filesystem ramdisk into the kernel"
+
+config EMBEDDED_RAMDISK_IMAGE
+        string "Filename of gziped ramdisk image"
+        depends on EMBEDDED_RAMDISK
+        default "ramdisk.gz"
+        help
+          This is the filename of the ramdisk image to be built into the
+          kernel.  Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
+          The ramdisk image is not part of the kernel distribution; you must
+          provide one yourself.
+endmenu
+
+source "arch/xtensa/Kconfig.debug"
+
+source "security/Kconfig"
+
+source "crypto/Kconfig"
+
+source "lib/Kconfig"
+
+