The new UEFI-like firmware interface (LEFI, i.e. Loongson Unified
Firmware Interface) has 3 advantages:

1, Firmware export a physical memory map which is similar to X86's
   E820 map, so prom_init_memory() will be more elegant that #ifdef
   clauses can be removed.
2, Firmware export a pci irq routing table, we no longer need pci
   irq routing fixup in kernel's code.
3, Firmware has a built-in vga bios, and its address is exported,
   the linux kernel no longer need an embedded blob.

With the LEFI interface, Loongson-3A/2G and all their successors can use
a unified kernel. All Loongson-based machines support this new interface
except 2E/2F series.
Signed-off-by: NHuacai Chen <chenhc@lemote.com>
Signed-off-by: NHongliang Tao <taohl@lemote.com>
Signed-off-by: NHua Yan <yanh@lemote.com>
Tested-by: NAlex Smith <alex.smith@imgtec.com>
Reviewed-by: NAlex Smith <alex.smith@imgtec.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/6632Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Having received another series of whitespace patches I decided to do this
once and for all rather than dealing with this kind of patches trickling
in forever.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

For unexplainable reasons the Loongson 2 clock API was implemented in a
module so fixing this involved shifting large amounts of code around.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Signed-off-by: NFlorian Fainelli <florian@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3336/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Add missing #inclusions of <linux/irq.h> to a whole bunch of files that should
really include it.  Note that this can replace #inclusions of <asm/irq.h>.

This is required for the patch to sort out irqflags handling function naming to
compile on MIPS.

The problem is that these files require access to things like setup_irq() -
which isn't available by #including <linux/interrupt.h>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NRalf Baechle <ralf@linux-mips.org>

On FuLoong-2F IP6 is shared by the performance counter overflow interrupt
and the Bonito northbridge interrupt.  To reduce overhead only call
do_IRQ() when oprofile is enabled to reduce overhead.

This patch adds an inline function do_perfcnt_IRQ() to hide the #if's ,
which can be shared by the other Loongson machines, i.e. gdium.
Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1492/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

set_irq_trigger_mode() is not needed on all platforms so remove it
and move the related source code to mach_init_irq().

This will allow gdium to share the common irq.c without adding an empty
set_irq_trigger_mode().
Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1493/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

There's a typo in the LOONGSON_ADDRWIN_CFG macro. The cpu window mmap
register address should contain the destination parameters not the
source one.  This has not been noticed because the code is only using
source = destination.
Signed-off-by: NArnaud Patard <apatard@mandriva.com>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1162/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Currently wuzj@lemote.com is not usable; change it to wuzhangjin@gmail.com.
Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: yanh@lemote.com
Cc: huhb@lemote.com
Cc: zhangfx@lemote.com
Patchwork: http://patchwork.linux-mips.org/patch/829/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Changes:

	o Move bus_clock into prom_init_env()
	o Initialize the cpu_clock_freq to the default values for the
	correspoding processor revisions if no such environment variable
	passed by BIOS/Bootloader.
Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: yanh@lemote.com
Cc: huhb@lemote.com
Cc: zhangfx@lemote.com
Patchwork: http://patchwork.linux-mips.org/patch/826/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

This patchs uses a loongson_uart_base variable instead of the
uart_base[] array and adds a new kernel option to avoid to compile
uart_base.c all the time, which will save a little bit of memory for us.
Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
http://patchwork.linux-mips.org/patch/727/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Yeeloong 2F netbook has an KB3310B embedded controller to manage the LID
action.  When the LID is closed or opened a SCI interrupt is sent out and
the corresponding event is saved to an EC register for later query.

Allow the LID open interrupt to wake the processor from wait mode if it is
in the suspend mode.
Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/685/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Loongson 2F supports CPU clock scaling. When put it into wait mode by
setting the frequency as ZERO it will stay in this mode until an external
interrupt wakes the CPU again.

To enable clock scaling support, an external timer of a known stable rate
is required.
Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: cpufreq@vger.kernel.org,
Cc: Dave Jones <davej@redhat.com>,
Cc: Dominik Brodowski <linux@dominikbrodowski.net>,
Cc: yanh@lemote.com
Cc: huhb@lemote.com,
Patchwork: http://patchwork.linux-mips.org/patch/660/
Patchwork: http://patchwork.linux-mips.org/patch/751/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

This patch adds two new kernel options: CPU_SUPPORTS_CPUFREQ and
CPU_SUPPORTS_ADDRWINCFG to describe the new features of Loongons 2F and
replaces the several ugly #if clauses by them.

These two options will be utilized by the future loongson revisions and
related drivers such as the coming Loongson 2F CPUFreq driver.
Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Fuloong 2F, Yeeloong 2F and Menglong 2F have different reset / shutdown
logic.
Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com>
Cc: zhangfx@lemote.com
Cc: yanh@lemote.com 
Cc: huhb@lemote.com
Cc: Nicholas Mc Guire <hofrat@hofr.at>
Cc: Arnaud Patard <apatard@mandriva.com>
Cc: loongson-dev@googlegroups.com
Cc: linux-mips@linux-mips.org
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Loongson 2F has built-in DDR2 and PCI-X controller. The PCI-X controller
has a programming interface similiar to the the FPGA northbridge used on
Loongson 2E.

The main differences between Loongson 2E and Loongson 2F include:

1. Loongson 2F has an extra address window configuration module, which
   is used to map CPU address space to DDR or PCI address space, or map
   the PCI-DMA address space to DDR or LIO address space.

2. Loongson 2F supports 8 levels of software configurable CPu frequency
   which can be configured in the LOONGSON_CHIPCFG0 register.  The coming
   cpufreq and standby support are based on this feature.

Loongson.h abstracts the modules and corresponding methods are abstracted.

Add other Loongson-2F-specific source code including gcc 4.4 support, PCI
memory space, PCI IO space, DMA address.
Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

To share the same kernel image amon different machines we have added the
machtype command line support.

In the old serial port implementation the UART base address is hardcoded as
a macro in machine.h which breaks with machtype, so change that to discover
the address dynamically.  Also move the initialization of the UART base
address to uart_base.c to avoid remapping twice for early_printk.c and
serial.c.
Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/581/
Patchwork: http://patchwork.linux-mips.org/patch/682/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

To choose code for different machines by the value of machtype it needs to
be initialized as early as possible.  So move initialization of
mips_machtype to prom_init().
Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

The built-in Loongson 2E/2F northbridge in is bonito64-compatible but not
identical with it.  To avoid influencing the original bonito64 support and
make the loongson support more maintainable, it's better to separate the
Bonito64 code from the Loongson code.

This also prepares the kernel for the coming Loongson 2f machines family
support.
Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com>
Cc: Linux-MIPS <linux-mips@linux-mips.org>
Cc: yanh@lemote.com
Cc: huhb@lemote.com
Cc: Zhang Le <r0bertz@gentoo.org>
Cc: zhangfx@lemote.com,
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

To share common loongson source code between all of the loongson-based
machines. there is a need to split it out of the fuloong-2e/ directory.
at the same time, other according tuning is needed. the machine-specific
parts are defined as macros in relative header file, pci.h, mem.h,
machine.h.
Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

To make source code of loongson sharable to the machines(such as gdium)
made by the other companies, we rename arch/mips/lemote to
arch/mips/loongson, asm/mach-lemote to asm/mach-loongson, and rename lm2e
to the name of the machine: fuloong-2e. accordingly, FULONG are renamed to
FULOONG2E to make it distinguishable to the future FULOONG2F.  and also,
some other relative tuning is needed.
Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

This kernel support is needed by the user-space tool:oprofile to profile
linux kernel or applications via loongson2 performance counters. you can
enable this driver via CONFIG_OPROFILE = y or m.

On Loongson2 there are two performance counters, each one can count 16
events respectively. when anyone of the performance counter overflows, an
interrupt will be generated and is routed to the IRQ MIPS_CPU_IRQ_BASE + 6.
Signed-off-by: NYanhua <yanh@lemote.com>
Signed-off-by: NWu Zhangjin <wuzj@lemote.com>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Fixup the wrong original comment of pcimap, and make the source code more
understandable. and also, some new extra consideration is added in.
Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

With the help of script/checkpatch.pl, i have cleaned up the coding
style.

1. remove un-needed header files and tune some comments.
2. remove some un-needed { }

add a new header file loongson.h:

3. move some common header files to loongson.h
4. move some common extern declartions to loongson.h

and this new header file is needed for future loongson2f support.
Signed-off-by: NWu Zhangjin <wuzj@lemote.com>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>