CRIS: Drop support for the CRIS port

The port was added back in 2000 so it's no longer even a good source
of inspiration for newer ports (if it ever was)

The last SoC (ARTPEC-3) with a CRIS main CPU was launched in 2008.

Coupled with time and working developer board hardware being
in low supply, it's time to drop the port from Linux.

So long and thanks for all the fish!
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Documentation/00-INDEX

@@ -112,8 +112,6 @@ cputopology.txt
 	- documentation on how CPU topology info is exported via sysfs.
 crc32.txt
 	- brief tutorial on CRC computation
-cris/
-	- directory with info about Linux on CRIS architecture.
 crypto/
 	- directory with info on the Crypto API.
 dcdbas.txt

Documentation/cris/README

-Linux on the CRIS architecture
-==============================
-
-This is a port of Linux to Axis Communications ETRAX 100LX,
-ETRAX FS and ARTPEC-3 embedded network CPUs.
-
-For more information about CRIS and ETRAX please see further below.
-
-In order to compile this you need a version of gcc with support for the
-ETRAX chip family. Please see this link for more information on how to
-download the compiler and other tools useful when building and booting
-software for the ETRAX platform:
-
-http://developer.axis.com/wiki/doku.php?id=axis:install-howto-2_20
-
-What is CRIS ?
---------------
-
-CRIS is an acronym for 'Code Reduced Instruction Set'. It is the CPU
-architecture in Axis Communication AB's range of embedded network CPU's,
-called ETRAX.
-
-The ETRAX 100LX chip
---------------------
-
-For reference, please see the following link:
-
-http://www.axis.com/products/dev_etrax_100lx/index.htm
-
-The ETRAX 100LX is a 100 MIPS processor with 8kB cache, MMU, and a very broad
-range of built-in interfaces, all with modern scatter/gather DMA.
-
-Memory interfaces:
-
-	* SRAM
-	* NOR-flash/ROM
-	* EDO or page-mode DRAM
-	* SDRAM
-
-I/O interfaces:
-
-	* one 10/100 Mbit/s ethernet controller
-	* four serial-ports (up to 6 Mbit/s)
-	* two synchronous serial-ports for multimedia codec's etc.
-	* USB host controller and USB slave
-	* ATA
-	* SCSI
-	* two parallel-ports
-	* two generic 8-bit ports
-
-	(not all interfaces are available at the same time due to chip pin
-         multiplexing)
-
-ETRAX 100LX is CRISv10 architecture.
-
-
-The ETRAX FS and ARTPEC-3 chips
--------------------------------
-
-The ETRAX FS is a 200MHz 32-bit RISC processor with on-chip 16kB
-I-cache and 16kB D-cache and with a wide range of device interfaces
-including multiple high speed serial ports and an integrated USB 1.1 PHY.
-
-The ARTPEC-3 is a variant of the ETRAX FS with additional IO-units
-used by the Axis Communications network cameras.
-
-See below link for more information:
-
-http://www.axis.com/products/dev_etrax_fs/index.htm
-
-ETRAX FS and ARTPEC-3 are both CRISv32 architectures.
-
-Bootlog
--------
-
-Just as an example, this is the debug-output from a boot of Linux 2.4 on
-a board with ETRAX 100LX. The displayed BogoMIPS value is 5 times too small :)
-At the end you see some user-mode programs booting like telnet and ftp daemons.
-
-Linux version 2.4.1 (bjornw@godzilla.axis.se) (gcc version 2.96 20000427 (experimental)) #207 Wed Feb 21 15:48:15 CET 2001
-ROM fs in RAM, size 1376256 bytes
-Setting up paging and the MMU.
-On node 0 totalpages: 2048
-zone(0): 2048 pages.
-zone(1): 0 pages.
-zone(2): 0 pages.
-Linux/CRIS port on ETRAX 100LX (c) 2001 Axis Communications AB
-Kernel command line: 
-Calibrating delay loop... 19.91 BogoMIPS
-Memory: 13872k/16384k available (587k kernel code, 2512k reserved, 44k data, 24k init)
-kmem_create: Forcing size word alignment - vm_area_struct
-kmem_create: Forcing size word alignment - filp
-Dentry-cache hash table entries: 2048 (order: 1, 16384 bytes)
-Buffer-cache hash table entries: 2048 (order: 0, 8192 bytes)
-Page-cache hash table entries: 2048 (order: 0, 8192 bytes)
-kmem_create: Forcing size word alignment - kiobuf
-kmem_create: Forcing size word alignment - bdev_cache
-Inode-cache hash table entries: 1024 (order: 0, 8192 bytes)
-kmem_create: Forcing size word alignment - inode_cache
-POSIX conformance testing by UNIFIX
-Linux NET4.0 for Linux 2.4
-Based upon Swansea University Computer Society NET3.039
-Starting kswapd v1.8
-kmem_create: Forcing size word alignment - file lock cache
-kmem_create: Forcing size word alignment - blkdev_requests
-block: queued sectors max/low 9109kB/3036kB, 64 slots per queue
-ETRAX 100LX 10/100MBit ethernet v2.0 (c) 2000 Axis Communications AB
-eth0 initialized
-eth0: changed MAC to 00:40:8C:CD:00:00
-ETRAX 100LX serial-driver $Revision: 1.7 $, (c) 2000 Axis Communications AB
-ttyS0 at 0xb0000060 is a builtin UART with DMA
-ttyS1 at 0xb0000068 is a builtin UART with DMA
-ttyS2 at 0xb0000070 is a builtin UART with DMA
-ttyS3 at 0xb0000078 is a builtin UART with DMA
-Axis flash mapping: 200000 at 50000000
-Axis flash: Found 1 x16 CFI device at 0x0 in 16 bit mode
- Amd/Fujitsu Extended Query Table v1.0 at 0x0040
-Axis flash: JEDEC Device ID is 0xC4. Assuming broken CFI table.
-Axis flash: Swapping erase regions for broken CFI table.
-number of CFI chips: 1
- Using default partition table
-I2C driver v2.2, (c) 1999-2001 Axis Communications AB
-ETRAX 100LX GPIO driver v2.1, (c) 2001 Axis Communications AB
-NET4: Linux TCP/IP 1.0 for NET4.0
-IP Protocols: ICMP, UDP, TCP
-kmem_create: Forcing size word alignment - ip_dst_cache
-IP: routing cache hash table of 1024 buckets, 8Kbytes
-TCP: Hash tables configured (established 2048 bind 2048)
-NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
-VFS: Mounted root (cramfs filesystem) readonly.
-Init starts up...
-Mounted none on /proc ok.
-Setting up eth0 with ip 10.13.9.116 and mac 00:40:8c:18:04:60
-eth0: changed MAC to 00:40:8C:18:04:60
-Setting up lo with ip 127.0.0.1
-Default gateway is 10.13.9.1
-Hostname is bbox1
-Telnetd starting, using port 23.
-  using /bin/sash as shell.
-sftpd[15]: sftpd $Revision: 1.7 $ starting up
-
-
-
-And here is how some /proc entries look:
-
-17# cd /proc
-17# cat cpuinfo
-cpu             : CRIS
-cpu revision    : 10
-cpu model       : ETRAX 100LX
-cache size      : 8 kB
-fpu             : no
-mmu             : yes
-ethernet        : 10/100 Mbps
-token ring      : no
-scsi            : yes
-ata             : yes
-usb             : yes
-bogomips        : 99.84
-
-17# cat meminfo
-        total:    used:    free:  shared: buffers:  cached:
-Mem:   7028736   925696  6103040   114688        0   229376
-Swap:        0        0        0
-MemTotal:         6864 kB
-MemFree:          5960 kB
-MemShared:         112 kB
-Buffers:             0 kB
-Cached:            224 kB
-Active:            224 kB
-Inact_dirty:         0 kB
-Inact_clean:         0 kB
-Inact_target:        0 kB
-HighTotal:           0 kB
-HighFree:            0 kB
-LowTotal:         6864 kB
-LowFree:          5960 kB
-SwapTotal:           0 kB
-SwapFree:            0 kB
-17# ls -l /bin
--rwxr-xr-x  1 342      100         10356  Jan 01 00:00 ifconfig
--rwxr-xr-x  1 342      100         17548  Jan 01 00:00 init
--rwxr-xr-x  1 342      100          9488  Jan 01 00:00 route
--rwxr-xr-x  1 342      100         46036  Jan 01 00:00 sftpd
--rwxr-xr-x  1 342      100         48104  Jan 01 00:00 sh
--rwxr-xr-x  1 342      100         16252  Jan 01 00:00 telnetd
-
-
-
-
-
-
-
-
-

Documentation/devicetree/bindings/cris/axis.txt

-Axis Communications AB
-ARTPEC series SoC Device Tree Bindings
-
-
-CRISv32 based SoCs are ETRAX FS and ARTPEC-3:
-
-    - compatible = "axis,crisv32";
-
-

Documentation/devicetree/bindings/cris/boards.txt

-Boards based on the CRIS SoCs:
-
-Required root node properties:
-    - compatible = should be one or more of the following:
-	- "axis,dev88"	- for Axis devboard 88 with ETRAX FS
-
-Optional:
-

Documentation/devicetree/bindings/interrupt-controller/axis,crisv32-intc.txt

-* CRISv32 Interrupt Controller
-
-Interrupt controller for the CRISv32 SoCs.
-
-Main node required properties:
-
-- compatible : should be:
-	"axis,crisv32-intc"
-- interrupt-controller : Identifies the node as an interrupt controller
-- #interrupt-cells : Specifies the number of cells needed to encode an
-  interrupt source. The type shall be a <u32> and the value shall be 1.
-- reg: physical base address and size of the intc registers map.
-
-Example:
-
-	intc: interrupt-controller {
-		compatible = "axis,crisv32-intc";
-		reg = <0xb001c000 0x1000>;
-		interrupt-controller;
-		#interrupt-cells = <1>;
-	};
-
-

MAINTAINERS

@@ -3704,16 +3704,6 @@ S:	Maintained
 F:	Documentation/filesystems/cramfs.txt
 F:	fs/cramfs/
 
-CRIS PORT
-M:	Mikael Starvik <starvik@axis.com>
-M:	Jesper Nilsson <jesper.nilsson@axis.com>
-L:	linux-cris-kernel@axis.com
-W:	http://developer.axis.com
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/jesper/cris.git
-S:	Maintained
-F:	arch/cris/
-F:	drivers/tty/serial/crisv10.*
-
 CRYPTO API
 M:	Herbert Xu <herbert@gondor.apana.org.au>
 M:	"David S. Miller" <davem@davemloft.net>

arch/cris/Kconfig.debug

-# SPDX-License-Identifier: GPL-2.0
-menu "Kernel hacking"
-
-config PROFILING
-	bool "Kernel profiling support"
-
-config SYSTEM_PROFILER
-	bool "System profiling support"
-
-source "lib/Kconfig.debug"
-
-config ETRAX_KGDB
-	bool "Use kernel GDB debugger"
-	depends on DEBUG_KERNEL
-	---help---
-	  The CRIS version of gdb can be used to remotely debug a running
-	  Linux kernel via the serial debug port.  Provided you have gdb-cris
-	  installed, run gdb-cris vmlinux, then type
-
-	  (gdb) set remotebaud 115200           <- kgdb uses 115200 as default
-	  (gdb) target remote /dev/ttyS0        <- maybe you use another port
-
-	  This should connect you to your booted kernel (or boot it now if you
-	  didn't before).  The kernel halts when it boots, waiting for gdb if
-	  this option is turned on!
-
-
-config DEBUG_NMI_OOPS
-	bool "NMI causes oops printout"
-	depends on DEBUG_KERNEL
-	help
-	  If the system locks up without any debug information you can say Y
-	  here to make it possible to dump an OOPS with an external NMI.
-
-config NO_SEGFAULT_TERMINATION
-	bool "Keep segfaulting processes"
-	help
-	  Place segfaulting user mode processes on a wait queue instead of
-	  delivering a terminating SIGSEGV to allow debugging with gdb.
-
-endmenu

arch/cris/Makefile

-#
-# cris/Makefile
-#
-# This file is included by the global makefile so that you can add your own
-# architecture-specific flags and dependencies. Remember to do have actions
-# for "archclean" and "archdep" for cleaning up and making dependencies for
-# this architecture
-#
-# This file is subject to the terms and conditions of the GNU General Public
-# License.  See the file "COPYING" in the main directory of this archive
-# for more details.
-
-KBUILD_DEFCONFIG := etrax-100lx_v2_defconfig
-
-arch-y := v10
-arch-$(CONFIG_ETRAX_ARCH_V10) := v10
-arch-$(CONFIG_ETRAX_ARCH_V32) := v32
-
-# No config available for make clean etc
-mach-y := fs
-mach-$(CONFIG_CRIS_MACH_ARTPEC3) := a3
-mach-$(CONFIG_ETRAXFS) := fs
-
-ifneq ($(arch-y),)
-SARCH := arch-$(arch-y)
-inc := -Iarch/cris/include/uapi/$(SARCH)
-inc += -Iarch/cris/include/$(SARCH)
-inc += -Iarch/cris/include/uapi/$(SARCH)/arch
-inc += -Iarch/cris/include/$(SARCH)/arch
-else
-SARCH :=
-inc :=
-endif
-
-ifneq ($(mach-y),)
-MACH := mach-$(mach-y)
-inc += -Iarch/cris/include/$(SARCH)/$(MACH)/
-inc += -Iarch/cris/include/$(SARCH)/$(MACH)/mach
-else
-MACH :=
-endif
-
-ifneq ($(CONFIG_BUILTIN_DTB),"")
-core-$(CONFIG_OF) += arch/cris/boot/dts/
-endif
-
-LD = $(CROSS_COMPILE)ld -mcrislinux
-
-OBJCOPYFLAGS := -O binary -R .note -R .comment -S
-
-KBUILD_AFLAGS += -mlinux -march=$(arch-y) $(inc)
-KBUILD_CFLAGS += -mlinux -march=$(arch-y) -pipe $(inc)
-KBUILD_CPPFLAGS += $(inc)
-
-ifdef CONFIG_FRAME_POINTER
-KBUILD_CFLAGS := $(subst -fomit-frame-pointer,,$(KBUILD_CFLAGS)) -g
-KBUILD_CFLAGS += -fno-omit-frame-pointer
-endif
-
-head-y := arch/cris/$(SARCH)/kernel/head.o
-
-LIBGCC = $(shell $(CC) $(KBUILD_CFLAGS) -print-file-name=libgcc.a)
-
-core-y		+= arch/cris/kernel/ arch/cris/mm/
-core-y		+= arch/cris/$(SARCH)/kernel/ arch/cris/$(SARCH)/mm/
-ifdef CONFIG_ETRAX_ARCH_V32
-core-y		+= arch/cris/$(SARCH)/$(MACH)/
-endif
-drivers-y	+= arch/cris/$(SARCH)/drivers/
-libs-y		+= arch/cris/$(SARCH)/lib/ $(LIBGCC)
-
-# cris source path
-SRC_ARCH              = $(srctree)/arch/cris
-# cris object files path
-OBJ_ARCH              = $(objtree)/arch/cris
-
-boot := arch/cris/boot
-MACHINE := arch/cris/$(SARCH)
-
-all: zImage
-
-zImage Image: vmlinux
-	$(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@
-
-archprepare:
-
-archclean:
-	$(Q)if [ -e arch/cris/boot ]; then \
-		$(MAKE) $(clean)=arch/cris/boot; \
-	fi
-
-CLEAN_FILES += \
-	$(boot)/zImage \
-	$(boot)/compressed/decompress.bin \
-	$(boot)/compressed/piggy.gz \
-	$(boot)/rescue/rescue.bin
-
-
-# MRPROPER_FILES +=
-
-define archhelp
-  echo  '* zImage        - Compressed kernel image (arch/cris/boot/zImage)'
-  echo  '* Image         - Uncompressed kernel image (arch/cris/boot/Image)'
-endef

arch/cris/arch-v10/drivers/Makefile

-# SPDX-License-Identifier: GPL-2.0
-#
-# Makefile for Etrax-specific drivers
-#
-
-obj-$(CONFIG_ETRAX_AXISFLASHMAP)	+= axisflashmap.o
-obj-$(CONFIG_ETRAX_I2C)			+= i2c.o
-obj-$(CONFIG_ETRAX_I2C_EEPROM)		+= eeprom.o
-obj-$(CONFIG_ETRAX_GPIO)		+= gpio.o
-obj-$(CONFIG_ETRAX_SYNCHRONOUS_SERIAL)	+= sync_serial.o
-

arch/cris/arch-v10/drivers/i2c.h

-/* SPDX-License-Identifier: GPL-2.0 */
-/* i2c.h */
-int i2c_init(void);
-
-/* High level I2C actions */
-int i2c_writereg(unsigned char theSlave, unsigned char theReg, unsigned char theValue);
-unsigned char i2c_readreg(unsigned char theSlave, unsigned char theReg);
-
-/* Low level I2C */
-void i2c_start(void);
-void i2c_stop(void);
-void i2c_outbyte(unsigned char x);
-unsigned char i2c_inbyte(void);
-int i2c_getack(void);
-void i2c_sendack(void);
-
-
-

arch/cris/arch-v10/kernel/Makefile

-# SPDX-License-Identifier: GPL-2.0
-#
-# Makefile for the linux kernel.
-#
-
-extra-y	:= head.o
-
-
-obj-y   := entry.o traps.o shadows.o debugport.o irq.o \
-	   process.o setup.o signal.o traps.o time.o ptrace.o \
-	   dma.o io_interface_mux.o
-
-obj-$(CONFIG_ETRAX_KGDB) += kgdb.o
-obj-$(CONFIG_ETRAX_FAST_TIMER) += fasttimer.o
-obj-$(CONFIG_MODULES)    += crisksyms.o
-
-clean:
-

arch/cris/arch-v10/kernel/crisksyms.c

-// SPDX-License-Identifier: GPL-2.0
-#include <linux/module.h>
-#include <asm/io.h>
-#include <arch/svinto.h>
-
-/* Export shadow registers for the CPU I/O pins */
-EXPORT_SYMBOL(genconfig_shadow);
-EXPORT_SYMBOL(port_pa_data_shadow);
-EXPORT_SYMBOL(port_pa_dir_shadow);
-EXPORT_SYMBOL(port_pb_data_shadow);
-EXPORT_SYMBOL(port_pb_dir_shadow);
-EXPORT_SYMBOL(port_pb_config_shadow);
-EXPORT_SYMBOL(port_g_data_shadow);
-
-/* Cache flush functions */
-EXPORT_SYMBOL(flush_etrax_cache);
-EXPORT_SYMBOL(prepare_rx_descriptor);

arch/cris/arch-v10/kernel/shadows.c

-// SPDX-License-Identifier: GPL-2.0
-/*
- * Various shadow registers. Defines for these are in include/asm-etrax100/io.h
- */
-
-/* Shadows for internal Etrax-registers */
-
-unsigned long genconfig_shadow;
-unsigned long gen_config_ii_shadow;
-unsigned long port_g_data_shadow;
-unsigned char port_pa_dir_shadow;
-unsigned char port_pa_data_shadow;
-unsigned char port_pb_i2c_shadow;
-unsigned char port_pb_config_shadow;
-unsigned char port_pb_dir_shadow;
-unsigned char port_pb_data_shadow;
-unsigned long r_timer_ctrl_shadow;
-
-/* Shadows for external I/O port registers.
- * These are only usable if there actually IS a latch connected
- * to the corresponding external chip-select pin.
- *
- * A common usage is that CSP0 controls LEDs and CSP4 video chips.
- */
-
-unsigned long port_cse1_shadow;
-unsigned long port_csp0_shadow;
-unsigned long port_csp4_shadow;
-
-/* Corresponding addresses for the ports.
- * These are initialized in arch/cris/mm/init.c using ioremap.
- */
-
-volatile unsigned long *port_cse1_addr;
-volatile unsigned long *port_csp0_addr;
-volatile unsigned long *port_csp4_addr;
-

arch/cris/arch-v10/lib/Makefile

-#
-# Makefile for Etrax-specific library files..
-#
-
-lib-y  = checksum.o checksumcopy.o string.o usercopy.o memset.o csumcpfruser.o
-

arch/cris/arch-v10/mm/Makefile

-#
-# Makefile for the linux cris-specific parts of the memory manager.
-#
-
-obj-y	 := fault.o init.o tlb.o
-

arch/cris/arch-v10/output_arch.ld

-/* At the time of this writing, there's no equivalent ld option. */
-OUTPUT_ARCH (cris)