ARM: zynq: Fix uart0 early console virtual address

Virtual address have to have the same offset within
a 2MB aligned section of virtual/phycial address space.

Fix uart0 virtual address to be align with physical one.
Also remove UART_SIZE which is completely unused.

Reported-by: Russ Smith <russells@google.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
tty: xuartps: Fix kernel-doc errors in the driver

No functional changes.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 489810a1a6efa08eb8168b96dcc22d71be2867b9)
tty: xuartps: Initialize ports according to aliases

Register port numbers according to order in DT aliases.
If aliases are not defined, order in DT is used.
If aliases are defined, register port id based
on that.
This patch ensures proper ttyPS0/1 assignment.

[soren]: Combined integer declarations in probe(), removed warning message
if no alias is found.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 928e9263492069eeebb4c867b841508837895e0e)
tty: xuartps: Clean up

This is all white space and comment clean up. Mostly reformatting
comments.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit e555a21149806b21ae63ba0b02d42ce100db5639)
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
tty: xuartps: Print warning in clock notifier

Print a warning if the clock notifier rejects a clock frequency change
to facilitate debugging (see:
http://thread.gmane.org/gmane.linux.ports.arm.kernel/304329/focus=304379)

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 5ce15d2d1efb9cacab9a331c730cc805124ee612)
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
tty: xuartps: Refactor read-modify-writes

A lot of read-modify-write sequences used a one-line statement which
nests a readl() within a writel(). Convert this into code sequences that
make the three steps more obvious.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 35dc5a538fb54bc30bdedf4c825da5c970b5ff90)
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
tty: xuartps: Don't write IRQ disable register to enable interrupts

A comment states, that, according to the data sheet, to enable
interrupts the disable register should be written, but the enable
register could be left untouched. And it suspsects a HW bug requiring
to write both.
Reviewing the data sheet, these statements seem wrong. Just as one would
expect. Writing to the enable/disable register enables/disables
interrupts.
Hence the misleading comment and needless write to the disable register
are removed from the enable sequence.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit b494a5fae452fc43519872565892fa873f6ea4fb)
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
tty: xuartps: Rebrand driver as Cadence UART

Zynq's UART is Cadence IP. Make this visible in the prompt in kconfig
and additional comments in the driver.
This also renames functions and symbols, as far as possible without
breaking user space API, to reflect the Cadence origin. This is achieved
through simple search and replace:
 - s/XUARTPS/CDNS_UART/g
 - s/xuartps/cdns_uart/g
The only exceptions are PORT_XUARTPS and the driver name, which stay as is,
due to their exposure to user space. As well as the - no legacy -
compatibility string 'xlnx,xuartps'

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit d9bb3fb12685209765fd838bec69d701d7b479e5)
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
tty: cadence: Document DT binding

Add binding documentation for the Cadence UART.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Acked-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Acked-by: Rob Herring <robh@kernel.org>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
(cherry picked from commit 09b6771798f262bedba51bbb66027564b0ff226e)
ARM: zynq: DT: Migrate UART to Cadence binding

The Zynq UART is Cadence IP and the driver has been renamed accordingly.
Migrate the DT to use the new binding for the UART driver.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Acked-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Acked-by: Rob Herring <robh@kernel.org>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
(cherry picked from commit 271b35d5c200d69d5fb317a976c8f24383c929a7)