linux.git/arch/nios2/kernel, branch v4.13

clocksource/drivers: Rename clocksource_probe to timer_probe

2017-06-14T09:59:16+00:00

The function name is now renamed to 'timer_probe' for consistency with
the CLOCKSOURCE_OF_DECLARE => TIMER_OF_DECLARE change.

Signed-off-by: Daniel Lezcano 
Acked-by: Viresh Kumar 
Acked-by: Heiko Stuebner 
Reviewed-by: Linus Walleij

clocksource/drivers: Rename CLOCKSOURCE_OF_DECLARE to TIMER_OF_DECLARE

2017-06-14T09:58:45+00:00

The CLOCKSOURCE_OF_DECLARE macro is used widely for the timers to declare the
clocksource at early stage. However, this macro is also used to initialize
the clockevent if any, or the clockevent only.

It was originally suggested to declare another macro to initialize a
clockevent, so in order to separate the two entities even they belong to the
same IP. This was not accepted because of the impact on the DT where splitting
a clocksource/clockevent definition does not make sense as it is a Linux
concept not a hardware description.

On the other side, the clocksource has not interrupt declared while the
clockevent has, so it is easy from the driver to know if the description is
for a clockevent or a clocksource, IOW it could be implemented at the driver
level.

So instead of dealing with a named clocksource macro, let's use a more generic
one: TIMER_OF_DECLARE.

The patch has not functional changes.

Signed-off-by: Daniel Lezcano 
Acked-by: Heiko Stuebner 
Acked-by: Neil Armstrong 
Acked-by: Arnd Bergmann 
Acked-by: Matthias Brugger 
Reviewed-by: Linus Walleij

nios2: remove custom early console implementation

2017-05-11T09:44:21+00:00

As of commits d8f347ba35cf ("nios2: enable earlycon support"),
0dcc0542a006 ("serial: altera_jtaguart: add earlycon support") and
4d9d7d896d77 ("serial: altera_uart: add earlycon support"), the nios2
architecture and the altera_uart/altera_jtaguart drivers support
earlycon. Thus, the custom early console implementation for nios2 is no
longer necessary to get early boot messages. Remove it and rely fully on
earlycon support.

Signed-off-by: Tobias Klauser

nios2: Add CDX support

2017-05-08T08:59:19+00:00

Add support for the CDX Code Density Extensions present in
Nios II R2 . This introduces new 16bit instruction set to
improve code density while retaining support for the 32bit
Nios II R2 instructions.

Signed-off-by: Marek Vasut 
Cc: Ley Foon Tan

nios2: Add BMX support

2017-05-08T08:59:19+00:00

Add support for the BMX Bit Manipulation Extensions present in
Nios II R2 . This introduces three new instructions, EXTRACT,
INSERT and MERGE.

Signed-off-by: Marek Vasut 
Cc: Ley Foon Tan

nios2: Add NIOS2_ARCH_REVISION to select between R1 and R2

2017-05-08T08:59:19+00:00

Allow user to select between Nios2 R1 and R2. Since R1 and R2 are
not binary compatible, we cannot have a single kernel binary and
there is no point in having DT property for discerning these two.

Signed-off-by: Marek Vasut 
Cc: Ley Foon Tan

nios2: enable earlycon support

2017-05-08T08:59:19+00:00

Enable generic earlycon support for nios2. This e.g. allows to use a
8250/16650 UART as earlycon.

In order to get the earlycon, we just need to call parse_early_param()
in early_init_devtree() as soon as the device tree is initially scanned.
By adding an stdout-path property to the dts (done in this patch for
10m50_devboard), the earlycon can be used.

In order to provide early printk support, we need to provide a dummy
implementation of early_console_write(), so that
arch/nios2/kernel/early_printk.c can still be compiled if neither
SERIAL_ALTERA_JTAGUART_CONSOLE nor SERIAL_ALTERA_UART_CONSOLE is
selected. As soon as the altera_uart and altera_jtaguart support
earlycon, the entire file can be removed.

Tested-by: Guenter Roeck 
Signed-off-by: Tobias Klauser 
Acked-by: Ley Foon Tan

nios2: constify irq_domain_ops

2017-05-08T08:59:19+00:00

struct irq_domain_ops is not modified, so it can be made const.

Signed-off-by: Tobias Klauser 
Acked-by: Ley Foon Tan

nios2: add .gitignore entries for auto-generated files

2017-05-08T08:59:19+00:00

Add .gitignore entries for nios2 specific files generated during the
build process.

Signed-off-by: Tobias Klauser 
Acked-by: Ley Foon Tan

nios2: reserve boot memory for device tree

2017-04-03T03:13:57+00:00

Make sure to reserve the boot memory for the flattened device tree.
Otherwise it might get overwritten, e.g. when initial_boot_params is
copied, leading to a corrupted FDT and a boot hang/crash:

  bootconsole [early0] enabled
  Early console on uart16650 initialized at 0xf8001600
  OF: fdt: Error -11 processing FDT
  Kernel panic - not syncing: setup_cpuinfo: No CPU found in devicetree!

  ---[ end Kernel panic - not syncing: setup_cpuinfo: No CPU found in devicetree!

Guenter Roeck says:

> I think I found the problem. In unflatten_and_copy_device_tree(), with added
> debug information:
>
> OF: fdt: initial_boot_params=c861e400, dt=c861f000 size=28874 (0x70ca)
>
> ... and then initial_boot_params is copied to dt, which results in corrupted
> fdt since the memory overlaps. Looks like the initial_boot_params memory
> is not reserved and (re-)allocated by early_init_dt_alloc_memory_arch().

Cc: stable@vger.kernel.org
Reported-by: Guenter Roeck 
Reference: http://lkml.kernel.org/r/20170226210338.GA19476@roeck-us.net
Tested-by: Guenter Roeck 
Signed-off-by: Tobias Klauser 
Acked-by: Ley Foon Tan