OMAP3xxx and OMAP4430 UART IP blocks have a restriction wrt RX FIFO.
Empty RX fifo read causes an abort.

OMAP3xxx:
	UART IP revision >= 0x52 have this issue
	MVR register format is:
	Bits  Field Name  Description  				Type  Reset
	31:8   RESERVED 					RO  	0x0
	7:4    MAJOR  	Major revision number of the module.  	RO  	0x--
	3:0    MINOR  	Minor revision number of the module.  	RO  	0x--

OMAP4xxx:
	All revisions have this issue
	Revision id check is not used as the format of MVR resigster has changed
	For omap4 MVR register reads as: 0x50410602 => Revision id = 0x0602
	Format of MVR register on omap4 is: (Courtesy: Cousson, Benoit)
	Bits  Field Name  Description  				Type  Reset
	31:30 SCHEME  	Scheme revision number of module  	RO  	0x1
	29:28 RESERVED   					RO  	0x1
	27:16 FUNC  	Function revision number of module  	RO  	0x041
	15:11 RTL  		Rtl revision number of module  	RO  	0x00
	10:8  MAJOR 	Major revision number of the module.  	RO  	0x6
	7:6   CUSTOM  	Custom revision number of the module.  	RO  	0x0
	5:0   MINOR  	Minor revision number of the module.  	RO  	0x02

Override the default 8250 read handler: mem_serial_in()
by a custom handler: serial_in_8250()
which makes sure that RX fifo is not read when empty

tested on zoom3(3630) board

Cc: Benoit Cousson <b-cousson@ti.com>
Signed-off-by: NVikram Pandita <vikram.pandita@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

This patch adds new function: omap_serial_init_port(port) that can be
used to initialize only selected UARTs as serial ports. Platforms can
then in their board files call this function instead of omap_serial_init()
if they don't want to use all UARTs as serial ports.
Signed-off-by: NMika Westerberg <ext-mika.1.westerberg@nokia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

Eliminate OMAP_MAX_NR_PORTS

Note that also the null terminator entry for omap1
serial_platform_data needs to be now removed to avoid
oopsing.

Note that mach-omap1 uses struct plat_serial8250_port
array, which requires a null terminator at the end,
and that's why we need to use ARRAY_SIZE - 1. This
is not needed on mach-omap2 as the array used is
struct omap_uart_state, and does not use a null
terminator.
Signed-off-by: NAlexander Shishkin <virtuoso@slind.org>
Acked-by: NKevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: NLadislav Michl <ladis@linux-mips.org>
Signed-off-by: NTony Lindgren <tony@atomide.com>

Allow enable/disable of low-power states during idle.  To
enable low-power idle:

   echo 1 > /debug/pm_debug/sleep_while_idle

 to disable:

   echo 0 > /debug/pm_debug/sleep_while_idle

Also allow enable/disable of OFF-mode.  To enable:

   echo 1 > /debug/pm_debug/enable_off_mode

 to disable:

   echo 0 > /debug/pm_debug/enable_off_mode
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

This patch removes the unnecessary UART4 platform which is under
data is wrong because of this

There is a separate platform structure for UART4
Signed-off-by: NSantosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-By: NKevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

Move the remaining headers under plat-omap/include/mach
to plat-omap/include/plat. Also search and replace the
files using these headers to include using the right path.

This was done with:

#!/bin/bash
mach_dir_old="arch/arm/plat-omap/include/mach"
plat_dir_new="arch/arm/plat-omap/include/plat"
headers=$(cd $mach_dir_old && ls *.h)
omap_dirs="arch/arm/*omap*/ \
drivers/video/omap \
sound/soc/omap"
other_files="drivers/leds/leds-ams-delta.c \
drivers/mfd/menelaus.c \
drivers/mfd/twl4030-core.c \
drivers/mtd/nand/ams-delta.c"

for header in $headers; do
	old="#include <mach\/$header"
	new="#include <plat\/$header"
	for dir in $omap_dirs; do
		find $dir -type f -name \*.[chS] | \
			xargs sed -i "s/$old/$new/"
	done
	find drivers/ -type f -name \*omap*.[chS] | \
		xargs sed -i "s/$old/$new/"
	for file in $other_files; do
		sed -i "s/$old/$new/" $file
	done
done

for header in $(ls $mach_dir_old/*.h); do
	git mv $header $plat_dir_new/
done
Signed-off-by: NTony Lindgren <tony@atomide.com>

Change low-level serial init to use ioremap
Signed-off-by: NTony Lindgren <tony@atomide.com>

Looks like these patches were not tested that well..
Signed-off-by: NTony Lindgren <tony@atomide.com>

Patch 94113260 split IO_ADDRESS
into OMAP1_IO_ADDRESS and OMAP2_IO_ADDRESS except for the omap4
code to avoid merge conflicts with the omap4 code that was queued
earlier.
Signed-off-by: NTony Lindgren <tony@atomide.com>

Most board-*.c files read configuration data from the bootloader in
their .init_machine() function.  This needs to happen earlier, at some
point before omap2_init_common_hw() is called.  This is because a
future patch will use the bootloader serial console port information
to enable the UART clocks earlier, immediately after omap2_clk_init().
This is in turn necessary since otherwise clock tree usecounts on
clocks like dpll4_m2x2_ck will be bogus, which can cause the
currently-active console UART clock to be disabled during boot.
Signed-off-by: NPaul Walmsley <paul@pwsan.com>

Second reason of OMAP4 boot failure on 2.6.31.rc6, the UART
platform data is not getting registered to kernel.
Registration was failing because of clock check failure in
omap_serial_init().
Below patch fix the same.

OMAP4 clock framework patches are still getting discussed on mailing
list so till then we need this.
Signed-off-by: NSyed Rafiuddin <rafiuddin.syed@ti.com>
Signed-off-by: NSantosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

After the patch series "[PATCH 00/14] OMAP PM fixes for .31-rc"
merge in 2.6.31-rc5, the kernel crashed during boot on OMAP4430.
This patch fixes it by adding UART4 support and related code.
Without this patch omap_serial_init() would produce " NULL pointer
dereference" and kernel crashes in the bootup on OMAP4430 platform.

Some more info on the merge issue can be found here.
More info- http://lkml.org/lkml/2009/8/20/192

Note: While merging this patch,"IO_ADDRESS" needs to be changed
to "OMAP2_IO_ADDRESS" if the Tony's below series is already merged in.
http://www.mail-archive.com/linux-omap@vger.kernel.org/msg15072.htmlSigned-off-by: NSyed Rafiuddin <rafiuddin.syed@ti.com>
Signed-off-by: NSantosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

Pass irqflags to 8250 driver with platform_data. At least Zoom2 has
IRQF_TRIGGER_RISING requirement for the 8250 GPIO irq.

This patch is dependent on 8250 driver changes getting accepted upstream:
http://git.kernel.org/?p=linux/kernel/git/sfr/linux-next.git;a=commit;h=7053133124d5cdf207c1168c7a0c582a18e12ea7Signed-off-by: NVikram Pandita <vikram.pandita@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

OMAP tags are deprecrated so drop them.

Drop UART config data which decides which UARTs to enable during boot.
This is no longer necessary since serial core code disables clocks
after inactivity.

Background: with new UART idle code, all on-chip UARTs are idled using
a configurable inactivity timer (default 5 seconds.)  After the
inactivity timer, UART clocks are disabled automatically.
Signed-off-by: NKalle Valo <kalle.valo@iki.fi>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

Search and replace OMAP_IO_ADDRESS with OMAP1_IO_ADDRESS and OMAP2_IO_ADDRESS,
and convert omap_read/write into a functions instead of a macros.

Also rename OMAP_MPUIO_VBASE to OMAP1_MPUIO_VBASE.

In the long run, most code should use ioremap + __raw_read/write instead.
Signed-off-by: NTony Lindgren <tony@atomide.com>

Use list_add_tail() when adding discovered UART ports.  This is so
traversal using list_for_each_entry() will traverse the list in the
order they were found.
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

This patch causes the OMAP uarts to honor the sysfs power/wakeup file
for IOPAD wakeups. Before the OMAP was always woken up from off mode
on a rs232 signal change.  This patch also creates a different
platform device for each serial port so that the wakeup properties can
be control per port.

By default, IOPAD wakeups are enabled for each UART.  To disable,

  # echo disabled > /sys/devices/platform/serial8250.0/power/wakeup

Where serial8250.0 can be replaced by .1, or .2 to control the other
ports.

Original idea and original patch from Russ Dill <russ.dill@gmail.com>

Cc: Russ Dill <russ.dill@gmail.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

It was possible for an unhandled interrupt to occur if there was incoming
serial traffic during wakeup from suspend. This was caused by the code
in arch-arm/mach-omap2/serial.c keeping interrupt enabled all the time,
but not acking its interrupts. Applies on top of PM branch.

Use the PM begin/end hooks to ensure that the "serial idle" interrupts
are disabled during the suspend path.  Also, since begin/end hooks are
now used, use the suspend_state that is passed in the begin hook instead
of the enter hook as per the platform_suspend_ops docs.
Signed-off-by: NTero Kristo <tero.kristo@nokia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

Streamline the OMAP4 special IRQ assignments by putting inside
normal init loop instead of having a separate loop.
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

This patch adds UART4 support on OMAP4430 development platform.
Signed-off-by: NSyed Rafiuddin <rafiuddin.syed@ti.com>

This patch adds the support for OMAP4. The platform and machine specific
headers and sources updated for OMAP4430 SDP platform.

OMAP4430 is Texas Instrument's SOC based on ARM Cortex-A9 SMP architecture.
It's a dual core SOC with GIC used for interrupt handling and SCU for cache
coherency.
Signed-off-by: NSantosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

Move platform_device_register() for serial device to
omap_serial_init()

There is no need to have arch_initcall() dependency in serial
as already board files call the function omap_serial_init()
Signed-off-by: NVikram Pandita <vikram.pandita@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

This patch makes it possible to change uart sleep timeout. New sysfs
entry is added (/sys/devices/platform/serial8250.<uart>/sleep_timeout)
Writing zero will disable the timeout feature and prevent UART clocks
from being disabled.

Also default timeout is increased to 5 second to make serial console
more usable.

Original patch was written by Tero Kristo.

Cc: Tero Kristo <Tero.Kristo@nokia.com>
Signed-off-by: NJouni Hogander <jouni.hogander@nokia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

This patch allows the UART clocks to be disabled when the OMAP UARTs
are inactive, thus permitting the chip to hit retention in idle.
After the expiration of an activity timer, each UART is allowed to
disable its clocks so the system can enter retention.  The activity
timer is (re)activated on any UART interrupt, UART wake event or any
IO pad wakeup.  The actual disable of the UART clocks is done in the
'prepare_idle' hook called from the OMAP idle loop.

While the activity timer is active, the smart-idle mode of the UART is
also disabled.  This is due to a "feature" of the UART module that
after a UART wakeup, the smart-idle mode may be entered before the
UART has communicated the interrupt, or upon TX, an idle mode may be
entered before the TX FIFOs are emptied.

Upon suspend, the 'prepare_suspend' hook cancels any pending activity
timers and allows the clocks to be disabled immediately.

In addition, upon disabling clocks the UART state is saved in case
of an off-mode transition while clocks are off.

Special thanks to Tero Kristo for the initial ideas and first versions
of UART idle support, and to Jouni Hogander for extra testing and
bugfixes.

Tested on OMAP3 (Beagle, RX51, SDP, EVM) and OMAP2 (n810)

Cc: Tero Kristo <tero.kristo@nokia.com>
Cc: Jouni Hogander <jouni.hogander@nokia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

This patch adds common function to enable/disable omap2/3 uart
clocks. Enabled uarts are passed by bootloader in atags and clocks for
these enabled uarts are touched.
Signed-off-by: NJouni Hogander <jouni.hogander@nokia.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

OMAP1_IO_ADDRESS(), OMAP2_IO_ADDRESS() and IO_ADDRESS() returns cookies
for use with __raw_{read|write}* for accessing registers.  Therefore,
these macros should return (void __iomem *) cookies, not integer values.

Doing this improves typechecking, and means we can find those places
where, eg, DMA controllers are incorrectly given virtual addresses to
DMA to, or physical addresses are thrown through a virtual to physical
address translation.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

This just leaves include/asm-arm/plat-* to deal with.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Enable serial idling and wakeup features
Signed-off-by: NJuha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

Many files include the filename at the beginning, serveral used a wrong one.
Signed-off-by: NUwe Zeisberger <Uwe_Zeisberger@digi.com>
Signed-off-by: NAdrian Bunk <bunk@stusta.de>

Patch from Lennert Buytenhek

This patch changes iop3xx and omap2 and to use PLAT8250_DEV_PLATFORM{,1}
as platform device id instead of just hardcoding 0/1 directly.
Signed-off-by: NLennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

This patch fixes OMAP clock framework to use clk_enable/disable
instead of clk_use/unuse as specified in include/linux/clk.h.
Signed-off-by: NTony Lindgren <tony@atomide.com>

This is needs to be visible to other architectures using the AMBA
bus and peripherals.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Patch from Tony Lindgren

This patch adds support for omap24xx series of processors.
The files live in arch/arm/mach-omap2, and share common
files with omap15xx and omap16xx processors in
arch/arm/plat-omap.

Omap24xx support was originally added for 2.6.9 by TI.
This code was then improved and integrated to share common
code with omap15xx and omap16xx processors by various
omap developers, such as Paul Mundt, Juha Yrjola, Imre Deak,
Tony Lindgren, Richard Woodruff, Nishant Menon, Komal Shah
et al.
Signed-off-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>