OUTPUT_FORMAT is not necessary here and the elf toolchain doesn't
support these formats. Since kernel should be built pass with elf
or Linux toolchain. This can be removed from vdso.ld.S

These are the built failed messages.
  VDSOL   arch/nds32/kernel/vdso/vdso.so.dbg
  /home/users/greentime/tmp/nds32le-elf-newlib-v3-upstream-b224/bin/../lib/gcc/nds32le-elf/8.0.1/../../../../nds32le-elf/bin/ld:
  target elf32-nds32le-linux not found
  collect2: error: ld returned 1 exit status
  make[1]: *** [arch/nds32/kernel/vdso/vdso.so.dbg] Error 1
  make: *** [vdso_prepare] Error 2
Signed-off-by: NGreentime Hu <greentime@andestech.com>

A commit for the nds32 architecture bootstrap("asm-generic/io.h:
move ioremap_nocache/ioremap_uc/ioremap_wc/ioremap_wt out of ifndef
CONFIG_MMU") will move the ioremap_nocache out of the CONFIG_MMU ifdef.
This means that in order to suppress re-definition errors we need to
setup #define's before importing asm-generic/io.h.
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Reviewed-by: NTobias Klauser <tklauser@distanz.ch>

It will be built failed because these options are not supported by older
version gcc.
Signed-off-by: NGreentime Hu <greentime@andestech.com>

Add a document to describe Andestech atcpit100 timer and
binding information.
Signed-off-by: NRick Chen <rickchen36@gmail.com>
Signed-off-by: NGreentime Hu <green.hu@gmail.com>
Acked-by: NRob Herring <robh@kernel.org>
Acked-by: NArnd Bergmann <arnd@arndb.de>

VDSO needs real-time cycle count to ensure the time accuracy.
Unlike others, nds32 architecture does not define clock source,
hence VDSO needs atcpit100 offering real-time cycle count
to derive the correct time.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NRick Chen <rickchen36@gmail.com>
Signed-off-by: NGreentime Hu <green.hu@gmail.com>

ATCPIT100 is often used on the Andes architecture,
This timer provide 4 PIT channels. Each PIT channel is a
multi-function timer, can be configured as 32,16,8 bit timers
or PWM as well.

For system timer it will set channel 1 32-bit timer0 as clock
source and count downwards until underflow and restart again.

It also set channel 0 32-bit timer0 as clock event and count
downwards until condition match. It will generate an interrupt
for handling periodically.
Signed-off-by: NRick Chen <rickchen36@gmail.com>
Signed-off-by: NGreentime Hu <green.hu@gmail.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>

Add andestech atcpit100 timer

This patch is used to support nds32 architecture to use these faraday
mac IP.
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch adds the Andestech Internal Vector Interrupt Controller
driver. You can find the spec here. Ch4.9 of AndeStar SPA V3 Manual.
http://www.andestech.com/product.php?cls=9Signed-off-by: NRick Chen <rick@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Reviewed-by: NMarc Zyngier <marc.zyngier@arm.com>

This patch adds an irqchip driver document for the Andestech Internal Vector
Interrupt Controller.
Signed-off-by: NRick Chen <rick@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch adds nds32 SoC(AE3XX and AG101P) binding documents.
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch adds nds32 L2 cache controller binding documents.
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch adds nds32 CPU binding documents.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NRick Chen <rick@andestech.com>
Signed-off-by: NZong Li <zong@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Reviewed-by: NRob Herring <robh@kernel.org>

Add a maintainer information for the nds32(Andes) architecture.
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch adds Makefile, Kconfig and vmlinux.lds.S files required for building
an nds32 kernel.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch adds nds32 defconfig.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch introduces some miscellaneous header files.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch adds support for device tree.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch adds support for timer.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch adds support for loadable modules.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch adds L2 cache support.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch adds ptrace support.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch add support for various library functions.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch adds support for signal handling.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>

This patch adds VDSO support. The VDSO code is currently used for
sys_rt_sigreturn() and optimised gettimeofday() (using the SoC timer counter).
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch adds support for system calls.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>

This patch adds definitions for the ELF format, relocation types, vdso
locations and EXEC_PAGESIZE.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch adds support for the DMA mapping API. It uses dma_map_ops for
flexibility.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch introduces ioremap implementations.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch includes the atomic and futex operations. Many atomic operations use
the load-lock word(llw) and store-condition word(scw) operations.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch includes irq related functions and irqchip_init().
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch includes copy_thread(), start_thread() implementation and cpu_context
structure definition. nds32 uses $r25 to get current task_struct.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch contains cache and TLB maintenance functions.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch includes page fault handler, mmap and fixup implementations.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch includes memory initializations and highmem supporting.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch includes virtual memory layout, PHYS_OFFSET is defined as 0x0. It
also includes the 4KB/8KB page size configurations and pte operations.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch includes the exception/interrupt entries, pt_reg structure and
related accessors.

/* Unaligned accessing handling*/
Andes processors cannot load/store information which is not naturally
aligned on the bus, i.e., loading a 4 byte data whose start address must
be divisible by 4. If unaligned data accessing is happened, data
unaligned exception will be triggered and user will get SIGSEGV or
kernel oops according to the unaligned address. In order to make user be
able to load/store data from an unaligned address, software load/store
emulation is implemented in arch/nds32/mm/alignment.c to address data
unaligned exception.

Unaligned accessing handling is disabled by default because it is not a
normal case. User can enable this feature by following steps.

A. Compile time:
    1. Enable kernel config CONFIG_ALIGNMENT_TRAP
B. Run time:
    1. Enter /proc/sys/nds32/unaligned_acess folder
    2. Write 1 to file enable_mode to enable unaligned accessing
       handling. User can disable it by writing 0 to this file.
    3. Write 1 to file debug to show which unaligned address is under
       processing. User can disable it by writing 0 to this file.

However, unaligned accessing handler cannot work if this unaligned
address is not accessible such as protection violation. On this
condition, the default behaviors for addressing data unaligned exception
still happen
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch includes the kernel startup code. It can get dtb pointer
passed from bootloader. It will create a temp mapping by tlb
instructions at beginning and goto start_kernel.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

This patch includes assembly macros, bit field definitions used in .S
files across arch/nds32/.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>

nds32 does not support VGA console, so prevent that kconfig symbol from
being enabled for nds32, thus fixing these build errors:

  drivers/video/console/vgacon.o: In function `vgacon_save_screen':
  /NOBACKUP/sqa2/greentime/contrib/src_pkg/linux-nds32/drivers/video/console/vgacon.c:1327:
  undefined reference to `screen_info'
  /NOBACKUP/sqa2/greentime/contrib/src_pkg/linux-nds32/drivers/video/console/vgacon.c:1327:
  undefined reference to `screen_info'
  /NOBACKUP/sqa2/greentime/contrib/src_pkg/linux-nds32/drivers/video/console/vgacon.c:1328:
  undefined reference to `screen_info'
  /NOBACKUP/sqa2/greentime/contrib/src_pkg/linux-nds32/drivers/video/console/vgacon.c:1328:
  undefined reference to `screen_info'
  drivers/video/console/vgacon.o: In function `vgacon_init':
  /NOBACKUP/sqa2/greentime/contrib/src_pkg/linux-nds32/drivers/video/console/vgacon.c:591:
  undefined reference to `screen_info'
  drivers/video/console/vgacon.o:/NOBACKUP/sqa2/greentime/contrib/src_pkg/linux-nds32/drivers/video/console/vgacon.c:591:
  more undefined references to `screen_info' follow
  make: *** [vmlinux] Error 1
Signed-off-by: NGreentime Hu <greentime@andestech.com>

It will get the wrong virtual address because port->mapbase is not added
the correct reg-offset yet. We have to update it before earlycon_map()
is called
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NRob Herring <robh@kernel.org>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: stable@vger.kernel.org
Fixes: 088da2a1 ("of: earlycon: Initialize port fields from DT
properties")