linux.git/drivers/tty/serial/earlycon.c, branch v4.10

ACPI: parse SPCR and enable matching console

2016-09-28T15:46:46+00:00

'ARM Server Base Boot Requiremets' [1] mentions SPCR (Serial Port
Console Redirection Table) [2] as a mandatory ACPI table that
specifies the configuration of serial console.

Defer initialization of DT earlycon until ACPI/DT decision is made.

Parse the ACPI SPCR table, setup earlycon if required,
enable specified console.

Thanks to Peter Hurley for explaining how this should work.

[1] http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.den0044a/index.html
[2] https://msdn.microsoft.com/en-us/library/windows/hardware/dn639132(v=vs.85).aspx

Signed-off-by: Aleksey Makarov 
Acked-by: Rafael J. Wysocki 
Reviewed-by: Peter Hurley 
Tested-by: Kefeng Wang 
Tested-by: Christopher Covington 
Signed-off-by: Greg Kroah-Hartman

of/serial: move earlycon early_param handling to serial

2016-09-28T15:43:15+00:00

We have multiple "earlycon" early_param handlers - merge the DT one into
the main earlycon one.  It's a cleanup that also will be useful
to defer setting up DT console until ACPI/DT decision is made.

Rename the exported function to avoid clashing with the function from
arch/microblaze/kernel/prom.c

Signed-off-by: Leif Lindholm 
Signed-off-by: Aleksey Makarov 
Acked-by: Rob Herring 
Acked-by: Greg Kroah-Hartman 
Reviewed-by: Peter Hurley 
Tested-by: Kefeng Wang 
Tested-by: Christopher Covington 
Signed-off-by: Greg Kroah-Hartman

serial: earlycon: Extend earlycon command line option to support 64-bit addresses

2016-09-02T13:03:35+00:00

earlycon implementation used "unsigned long" internally, but there are systems
(ARM with LPAE) where sizeof(unsigned long) == 4 and uart is mapped beyond 4GiB
address range.

Switch to resource_size_t internally and replace obsoleted simple_strtoul() with
kstrtoull().

Signed-off-by: Alexander Sverdlin 
Signed-off-by: Greg Kroah-Hartman

serial: earlycon: Show the earlycon "driver" in banner

2016-02-07T06:07:37+00:00

Output the earlycon "driver" from the just-parsed console 'name'
and 'index' fields.

NB: ->mapbase is a resource_size_t so use %pa format specifier

Acked-by: Rob Herring 
Signed-off-by: Peter Hurley 
Signed-off-by: Greg Kroah-Hartman

serial: earlycon: Common log banner for command line and DT

2016-02-07T06:07:37+00:00

Refactor the command line earlycon banner into earlycon_init() so
both earlycon startup methods output an info banner.

Acked-by: Rob Herring 
Signed-off-by: Peter Hurley 
Signed-off-by: Greg Kroah-Hartman

of: earlycon: Move address translation to of_setup_earlycon()

2016-02-07T06:07:37+00:00

Cleanup the early DT/earlycon separation; remove the 'addr' parameter
from of_setup_earlycon() and get the uart phys addr directly with a
new wrapper function, of_flat_dt_translate_addr(). Limit
fdt_translate_address() to file scope.

Acked-by: Rob Herring 
Signed-off-by: Peter Hurley 
Signed-off-by: Greg Kroah-Hartman

of: earlycon: Initialize port fields from DT properties

2016-02-07T06:07:37+00:00

Read the optional "reg-offset", "reg-shift", "reg-io-width" and endianness
properties and initialize the respective struct uart_port field if found.

NB: These bindings are common to several drivers and the values merely
indicate the default value; the registering earlycon setup() method can
simply override the values if required.

Acked-by: Rob Herring 
Signed-off-by: Peter Hurley 
Signed-off-by: Greg Kroah-Hartman

of: earlycon: Add options string handling

2016-02-07T06:07:37+00:00

Pass-through any options string in the 'stdout-path' property to the
earlycon "driver" setup.

Acked-by: Rob Herring 
Signed-off-by: Peter Hurley 
Signed-off-by: Greg Kroah-Hartman

of: earlycon: Fixup earlycon console name and index

2016-02-07T06:07:37+00:00

Use the console name embedded in the OF earlycon table by the
OF_EARLYCON_DECLARE() macro to initialize the struct console 'name'
and 'index' fields.

Acked-by: Rob Herring 
Signed-off-by: Peter Hurley 
Signed-off-by: Greg Kroah-Hartman

serial: earlycon: Fixup earlycon console name and index

2016-02-07T06:07:37+00:00

Properly initialize the struct console 'name' and 'index' fields for
the registering earlycon. For earlycons w/o trailing numerals, the
index is set to 0; otherwise, the index is set to the value of the
trailing numeral. For example, the 'exynos4210' earlycon name == "exynos"
and index == 4210. Earlycons with embedded numerals will have all
non-trailing numerals as part of the name; for example, the 's3c2412'
earlycon name == "s3c" and index == 2412.

This ackward scheme was initially added for the uart8250 earlycon;
adopt this scheme for the other earlycon "drivers".

Introduce earlycon_init() which performs the string scanning and
initializes the name and index fields; encapsulate the other console
field initializations within.

Acked-by: Rob Herring 
Signed-off-by: Peter Hurley 
Signed-off-by: Greg Kroah-Hartman