Remove all source files exclusive to Arm Compiler and IAR (#159) ...

* Remove all source files exclusive to Arm Compiler and IAR

* Also remove 'TOOLCHAIN_ARM'

* Remove targets.json entries for ARM and IAR

MPS2 CM3DS ethernet words instead of bytes ...

The functions smsc9220_receive_by_chunks and smsc9220_send_by_chunks are
supposed to implement receiving and sending packets by chunks. However,
the functions SMSC9220_EMAC::low_level_input and SMSC9220_EMAC::link_out,
which call them respectively, already require or assemble the full packet.
Also, smsc9220_receive_by_chunks doesn't implement the "chunks" part.

This commit renames the functions to smsc9220_receive_packet and
smsc9220_send_packet. The functions now do their operations by word
instead of by bytes. The functions SMSC9220_EMAC::low_level_input and
SMSC9220_EMAC::link_out already handle allocation, continuity and word
alignment of the packet buffer.

MPS2 CM3DS ethernet fix packet bug ...

The function smsc9220_receive_by_chunks loads data from the Ethernet port.
It is expected to return the Ethernet frame without the 4 CRC bytes.
However, it is required to call the Ethernet data port register (32-bit)
an amount equal to the number of frame words (including the 4 CRC bytes)
to pop all frame words. The current code doesn't call the register for the
last word (which has CRC data). This causes subsequent calls to have this
missed word at the beginning. The impact of this is huge as the high level
API is getting fed wrong data. The fix adds one additional call to the data
port register.

GPIO: Use uintptr_t for gpio_irq_api context ...

The HAL gpio_irq_api stores object IDs, which serve as a form of context
for the dispatch of the interrupt handler in the drivers level
InterruptIn Class. The way this is achieved is that the InterruptIn
Class casts its address to uint32_t, which is stored as the ID.
This results in compilation failure when the size of an object pointer
is greater than uint32_t, for example when building on a PC for unit
testing.

In order to allow Unit Testing of the InterruptIn Class, we replace the
use of uint32_t with uintptr_t (type capable of holding a pointer),
which allows portability and expresses intentions more clearly.
In aid of this latter goal, we also replace the use of the name "id"
with "context", to improve clarity - these are addresses of the context
related to that callback.

Update UART pin names & add MBED_CONF_TARGET_STDIO_UART overrides

Add standard pin-names validation script & tests

CMake Arm SSG: refactor CMake targets ...

Create CMake target per each Mbed OS target.

CMake: Add support for Arm's CM3DS_MPS2 target

Add SPDX license identifier to Arm files ...

Add license identifier to files which Arm owns the copyright to,
and contain either BSD-3 or Apache-2.0 licenses. This is to address
license errors raised by scancode analysis.

stack: armc: Workaround config passing bug ...

Workaround a bug where the boot stack size configuration option is not
passed on to armlink, the Arm Compiler's linker. Prefer
MBED_CONF_TARGET_BOOT_STACK_SIZE if present, as this is what the
configuration system should provide. Fall back to MBED_BOOT_STACK_SIZE
if MBED_CONF_TARGET_BOOT_STACK_SIZE is not defined, as in the case of
buggy tools. If both MBED_CONF_TARGET_BOOT_STACK_SIZE and
MBED_BOOT_STACK_SIZE are not defined, then we fall back to a hard-coded
value provided by the linkerscript. See
https://github.com/ARMmbed/mbed-os/issues/13474 for more information.

Use boot stack size from config system ...

To allow overriding of the boot stack size from the Mbed configuration
system, consistently use MBED_CONF_TARGET_BOOT_STACK_SIZE rather than
MBED_BOOT_STACK_SIZE.

Fixes #10319

- Fix the CI build issue. ...

- Incorporate the review comment.

Fix ethernet memory handling issues on CM3DS ...

Signed-off-by: Bence Kaposzta <bence.kaposzta@arm.com>

Clean up ARM toolchain heap+stack setup in targets ...

ARM Compiler 6.13 testing revealed linker errors pointing out
conflicting use of `__user_setup_stackheap` and
`__user_initial_stackheap` in some targets. Remove the unwanted
`__user_initial_stackheap` from the targets - the setup is
centralised in the common platform code.

Looking into this, a number of other issues were highlighted

* Almost all targets had `__initial_sp` hardcoded in assembler,
  rather than getting it from the scatter file. This was behind
  issue #11313. Fix this generally.
* A few targets' `__initial_sp` values did not match the scatter
  file layout, in some cases meaning they were overlapping heap
  space. They now all use the area reserved in the scatter file.
  If any problems are seen, then there is an error in the
  scatter file.
* A number of targets were reserving unneeded space for heap and
  stack in their startup assembler, on top of the space reserved in
  the scatter file, so wasting a few K. A couple were using that
  space for the stack, rather than the space in the scatter file.

To clarify expected behaviour:

* Each scatter file contains empty regions `ARM_LIB_HEAP` and
  `ARM_LIB_STACK` to reserve space. `ARM_LIB_STACK` is sized
  by the macro `MBED_BOOT_STACK_SIZE`, which is set by the tools.
  `ARM_LIB_HEAP` is generally the space left over after static
  RAM and stack.
* The address of the end of `ARM_LIB_STACK` is written into the
  vector table and on reset the CPU sets MSP to that address.
* The common platform code in Mbed OS provides `__user_setup_stackheap`
  for the ARM library. The ARM library calls this during startup, and
  it calls `__mbed_user_setup_stackheap`.
* The default weak definition of `__mbed_user_setup_stackheap` does not
  modify SP, so we remain on the boot stack, and the heap is set to
  the region described by `ARM_LIB_HEAP`. If `ARM_LIB_HEAP` doesn't
  exist, then the heap is the space from the end of the used data in
  `RW_IRAM1` to the start of `ARM_LIB_STACK`.
* Targets can override `__mbed_user_setup_stackheap` if they want.
  Currently only Renesas (ARMv7-A class) devices do.
* If microlib is in use, then it doesn't call `__user_setup_stackheap`.
  Instead it just finds and uses `ARM_LIB_STACK` and `ARM_LIB_HEAP`
  itself.

HAL I2C: adds missing DEVICE_I2C guards

ARM SSG/FM: Cope correctly with NC GPIO

Add HAL API for spi pinmap ...

Add the functions to get spi pinmaps to all targets.

Add HAL API for serial pinmap ...

Add the functions serial_tx_pinmap, serial_rx_pinmap, serial_cts_pinmap
and serial_rts_pinmap to all targets.

Add HAL API for i2c pinmap ...

Add the functions i2c_master_sda_pinmap, i2c_master_scl_pinmap,
i2c_slave_sda_pinmap and i2c_slave_scl_pinmap to all targets.

Add HAL API for analog in pinmap ...

Add the function analogin_pinmap to all targets.

Fixes typos in SMSC9220 Ethernet driver ...

Change-Id: I44a12ec1c57a926dadee81df1b84bd531d5cfccb
Signed-off-by: Bence Kaposzta <bence.kaposzta@arm.com>

[ARM_SSG] Support boot stack size configuration option

Merge branch 'master' into cm3ds_lp_requirements ...

Change-Id: I3c687694ee924938ec08ea40d0ddbcaf20dd0a73

Add RTC and Sleep to CM3DS ...

This commit represents the second stage of the low power implementations
that are required from Mbed 5.10 onwards. Besides the default hal
implementations (rtc_api.c and sleep.c), the PL031 RTC's native driver
needed to be added. Due to HW limitations in SSE-050 and the CM3DS,
Deep Sleep couldn't be implemented, therefore it is functionally
identical to Sleep (WFI).

Change-Id: Ibed2bdb452f48c98024dc7ef07fb51a4425e0a80
Signed-off-by: Bence Kaposzta <bence.kaposzta@arm.com>

Implement LP and us tickers to CM3DS ...

This commit represents the first stage of the low power implementations
that are required from Mbed 5.10 onwards. The LP ticker has been
implemented using a CMSDK Dual Timer's both timers (HW prescaler needed
to operate in the specified frequency domain), whereas the us ticker
uses one CMSDK Timer. Besides the default hal implementations (lp_ticker.c
and us_ticker.c), the CMSDK Dual Timer's native driver needed to be added.

Change-Id: I0b16b93dfac7753bebf430a2ce77761cb9c43ee5
Signed-off-by: Bence Kaposzta <bence.kaposzta@arm.com>

Merge branch 'cm3ds_emac' of git://github.com/kapi90/mbed-os into dev_rollup

Support erase value in Flash HAL drivers, FlashIAP and block devices

This commit adds EMAC driver for CM3DS that uses an SMSC LAN 9220 ...

Ethernet controller. To ensure proper operation, some methods
needed to be updated in the SMSC9220's native driver as well.
It passes all related Greentea tests, however when supervised by
the Python environment it tends to fail because of Timeout.

The current timeout is set to 1200s that seems to be a little bit short
to finish all test cases, the timeout happens towards the end of the
last test case.

Change-Id: I914608c34828b493a80e133cd132537a297bfc84
Signed-off-by: Bence Kaposzta <bence.kaposzta@arm.com>

ARM: Fix alignment of execute region to 8-byte boundary ...

--legacyalign, --no_legacyalign are deprecated from ARMC6 compiler, in order to
remove deprecated flags all linker files (GCC and IAR as well to have uniformity)
should strictly align to 8-byte boundary

Fix for CM3DS GPIO api