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path: root/drivers/tty/serial/xilinx_uartps.c
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2016-03-07serial: xuartps: Enable OF earlycon supportMichal Simek1-1/+3
Support early console setup via DT for all listed compatible strings. Remove EARLYCON_DECLARE which was done by: "Use common framework for earlycon declarations" (sha1: 2eaa790989e03900298ad24f77f1086dbbc1aebd) when OF_EARLYCON_DECLARE is defined. Signed-off-by: Michal Simek <michal.simek@xilinx.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-06tty: xuartps: Consolidate TX handlingSoren Brinkmann1-57/+40
start_tx and the ISR used largely identical code to transmit data. Consolidate that in one place. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-06tty: xuartps: Remove '_OFFSET' suffix from #definesSoren Brinkmann1-115/+106
Remove the _OFFSET suffix from all register defines which makes code a little easier to read and avoids a few line breaks. Suggested-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-06tty: xuartps: Improve sysrq handlingSoren Brinkmann1-15/+5
Handling magic sysrq included dropping a lock to avoid a deadlock that happened when cdns_uart_console_write tried to acquire a lock in the from the sysrq code path. By making the acquisition of the lock in cdns_uart_console_write depending on port->sysrq, cdns_uart_handle_rx can be simplified to simply call uart_handle_sysrq. Suggested-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-06tty: xuartps: Cleanup: Reformat if-elseSoren Brinkmann1-62/+62
Convert an if-else into the more common early return on error, reducing the indent level of the happy path. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-06tty: xuartps: Refactor IRQ handlingSoren Brinkmann1-6/+11
The system could deadlock handling RX IRQs when RX-related IRQ conditions became true while the receiver was disabled. To avoid this, enable/disable the RX/TX IRQs together with the receiver/transmitter. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-06tty: xuartps: Move request_irq to after setting up the HWSoren Brinkmann1-9/+12
Request_irq() should be _after_ h/w programming, otherwise an interrupt could be triggered and in-progress before the h/w has been setup. Reported-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-06tty: xuartps: Move RX path into helper functionSoren Brinkmann1-22/+28
Move RX-related IRQ handling into a helper function. Fixes a problem where every char received after a parity or frame error in the current isr will also be tagged as a parity or frame error. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-06tty: xuartps: Acquire port lock for shutdownSoren Brinkmann1-0/+6
Shutting down the UART port can happen while console operations are in progress. Holding the port lock serializes these operations and avoids the UART HW to be disabled in the middle of console prints. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-06tty: xuartps: Keep lock for whole ISRSoren Brinkmann1-2/+0
The RX path in the interrupt handler released a lock unnecessarily. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-06tty: xuartps: Improve startup functionSoren Brinkmann1-8/+12
The startup function is supposed to initialize the UART for receiving. Hence, don't enable the TX part. Also, protect HW accesses with the port lock. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-06tty: xuartps: Clear interrupt status register in shutdownSoren Brinkmann1-0/+1
When shutting down the UART, clear the interrupt status register. Bits in the ISR are cleared by writing them as '1'. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Reviewed-by: Moritz Fischer <moritz.fischer@ettus.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-06tty: xuartps: Don't consider circular buffer when enabling transmitterSoren Brinkmann1-1/+4
Restarting the transmitter even if the circ buffer is empty may be necessary to push out remaining data when the port is restarted after being stopped. Cc: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-06tty: xuartps: Use spinlock to serialize HW accessSoren Brinkmann1-12/+6
Instead of disabling the IRQ, use the spin lock to serialize accesses to the HW. This protects the driver from interference of non-IRQ callbacks with each other and makes the driver more consistent in its serialization method. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-06tty: xuartps: Beautify read-modify writesSoren Brinkmann1-6/+9
Non-functional, formatting changes to ease reading the code. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Reviewed-by: Moritz Fischer <moritz.fischer@ettus.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-05-10serial: xuartps: add __init to earlycon write methodMasahiro Yamada1-1/+2
Early console functions are only used during the early boot stage. This change just saves a small amount of memory footprint. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-04-28serial: xilinx: Use platform_get_irq to get irq description structureMichal Simek1-6/+6
For systems with CONFIG_SERIAL_OF_PLATFORM=y and device_type = "serial"; property in DT of_serial.c driver maps and unmaps IRQ (because driver probe fails). Then a driver is called but irq mapping is not created that's why driver is failing again in again on request_irq(). Based on this use platform_get_irq() instead of platform_get_resource() which is doing irq_desc allocation and driver itself can request IRQ. Fix both xilinx serial drivers in the tree. Signed-off-by: Michal Simek <michal.simek@xilinx.com> CC: <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-03-26serial: xuartps: Fix check in console_setup().Thomas Betker1-1/+1
cdns_uart_console_setup() checks port->mapbase != 0, but the port may not be initialized yet even if this condition is met [e.g., ioremap() may have failed]. Check port->membase != NULL instead, similar to cdns_early_console_setup(). Signed-off-by: Thomas Betker <thomas.betker@rohde-schwarz.com> Reviewed-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-03-26serial: xuartps: Get rid of register access macros.Thomas Betker1-112/+118
Get rid of cdns_uart_readl() and cdns_uart_writel() and just call readl() and writel() directly. Most of the patch was created by search-and-replace (I had to convert a few lines manually, and break some lines longer than 80 columns): * s/cdns_uart_readl(/readl(port->membase + /g * s/cdns_uart_writel(\([^,]*\),/writel(\1, port->membase +/g Signed-off-by: Thomas Betker <thomas.betker@rohde-schwarz.com> Acked-by: Sören Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-03-26serial: xuartps: Fix iobase use.Thomas Betker1-1/+0
cdns_uart_get_port() sets port->iobase = 1 to "mark port in use", but this "in use" condition is not checked anywhere else in the code. So remove the line, keeping port->iobase = 0 (which also makes more sense). Signed-off-by: Thomas Betker <thomas.betker@rohde-schwarz.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-03-26serial: xuartps: Fix cdns_uart_port[] definition.Thomas Betker1-1/+1
The code assumes that the array cdns_uart_port[] has dimension CDNS_UART_NR_PORTS, so let us define it this way. Signed-off-by: Thomas Betker <thomas.betker@rohde-schwarz.com> Reviewed-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-03-26serial: xuartps: Fix register space size.Thomas Betker1-1/+1
The register space size is 0x1000, and this value [not 0xfff] should be provided to request_mem_region(), ioremap(), etc. Signed-off-by: Thomas Betker <thomas.betker@rohde-schwarz.com> Reviewed-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-03-26tty: constify of_device_id arrayFabian Frederick1-1/+1
of_device_id is always used as const. (See driver.of_match_table and open firmware functions) Signed-off-by: Fabian Frederick <fabf@skynet.be> Acked-by: Peter Korsgaard <peter@korsgaard.com> Acked-by: Timur Tabi <timur@tabi.org> Acked-by: Patrice Chotard <patrice.chotard@st.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-03-07tty: serial: xilinx_uartps: Use Macro for ttyPS0Peter Crosthwaite1-1/+2
All instances of "ttyPS" use this macro except for this one. Convert it. Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Acked-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-02-02tty: xuartps: Fix RX hang, and TX corruption in termios callNathan Rossi1-4/+6
The implementation of flushing the RX FIFO breaks in a number of cases, it is impossible to ensure an complete flush of the RX FIFO due to the hardware not allowing the use of the FIFOs when the receiver is disabled (Reading from the FIFO register does not remove it from the FIFO when the RX_EN=0 or RX_DIS=1). Additionally during an initial set_termios call where RX_DIS=1 causes a hang waiting forever for the RX FIFO to empty. On top of this the FIFO will be cleared by the use of the RXRST bits on the Control Register, making the RX flush pointless (as it does not preserve the data read anyway). Due to the TXRST the TX FIFO and transmitter can be interrupted during frame trasmission, causing corruption and additionally data lost in the FIFO. Most other serial drivers do not flush or clear the FIFOs during a termios configuration change and as such do not have issues with corruption. For this UART controller is it required that the TXRST/RXRST bit be flagged during the change, this means that the data in the FIFO will be dropped when changing configuration. In order to prevent data loss and corruption of the transmitted data, wait until the TX FIFO is empty before changing the configuration. The performance of this may cause the set_termios call to take a longer amount of time especially on lower baud rates, however it is comparable to the same performance hit that a console_write call costs. Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com> Acked-by: Anirudha Sarangi <anirudh@xilinx.com> Acked-by: Harini Katakam <harinik@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-11-06tty: xuartps: Add support for setting modem control signalsLars-Peter Clausen1-1/+21
Add support for setting the state of the DTR and RTS signals. Acked-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-28serial: cadence: Add generic earlycon supportMichal Simek1-0/+19
Add earlycon support for the cadence serial port. This is based on recent patches: "tty/serial: pl011: add generic earlycon support" (sha1: 0d3c673e7881e691991b2a4745bd4f149603baa2) "tty/serial: add arm/arm64 semihosting earlycon" (sha1: d50d7269ebcb438afa346cdffce0f4e2a1b9e831) Signed-off-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-14Merge 3.17-rc5 into tty-nextGreg Kroah-Hartman1-1/+1
We want those fixes in here as well. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-08tty: xuartps: Fix tx_emtpy() callbackLars-Peter Clausen1-1/+1
The tx_empty() callback currently checks the TXEMPTY bit in the interrupt status register to decided whether the FIFO should be reported as empty or not. The bit in this register gets set when the FIFO state transitions from non-empty to empty but is cleared again in the interrupt handler. This means it is not suitable to be used to decided whether the FIFO is currently empty or not. Instead use the TXEMPTY bit from the status register which will be set as long as the FIFO is empty. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Acked-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-08tty: serial: xuartps: Remove .owner field for driverMichal Simek1-1/+0
There is no need to init .owner field. Based on the patch from Peter Griffin <peter.griffin@linaro.org> "mmc: remove .owner field for drivers using module_platform_driver" This patch removes the superflous .owner field for drivers which use the module_platform_driver API, as this is overriden in platform_driver_register anyway." Signed-off-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-07-09serial: treewide: Remove empty implementations of enable_ms()Alexander Shiyan1-6/+0
Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-04-24tty: xuartps: Rebrand driver as Cadence UARTSoren Brinkmann1-443/+465
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>
2014-04-24tty: xuartps: Don't write IRQ disable register to enable interruptsSoren Brinkmann1-5/+1
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>
2014-04-24tty: xuartps: Refactor read-modify-writesSoren Brinkmann1-28/+24
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>
2014-04-24tty: xuartps: Print warning in clock notifierSoren Brinkmann1-1/+3
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>
2014-04-24tty: xuartps: Clean upSoren Brinkmann1-136/+74
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>
2014-04-24tty: xuartps: Initialize ports according to aliasesMichal Simek1-8/+16
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>
2014-04-24tty: xuartps: Fix kernel-doc errors in the driverMichal Simek1-60/+49
No functional changes. Signed-off-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-12-17tty: xuartps: Properly guard sysrq specific codeSoren Brinkmann1-0/+2
Commit 'tty: xuartps: Implement BREAK detection, add SYSRQ support' (0c0c47bc40a2e358d593b2d7fb93b50027fbfc0c) introduced sysrq support without properly guarding sysrq specific code which results in build errors when sysrq is disabled: DNAME=KBUILD_STR(xilinx_uartps)" -c -o drivers/tty/serial/.tmp_xilinx_uartps.o drivers/tty/serial/xilinx_uartps.c drivers/tty/serial/xilinx_uartps.c: In function 'xuartps_isr': drivers/tty/serial/xilinx_uartps.c:247:5: error: 'struct uart_port' has no member named 'sysrq' drivers/tty/serial/xilinx_uartps.c:247:5: error: 'struct uart_port' has no member named 'sysrq' drivers/tty/serial/xilinx_uartps.c:247:5: error: 'struct uart_port' has no member named 'sysrq' make[3]: *** [drivers/tty/serial/xilinx_uartps.o] Error 1 Reported-by: Masanari Iida <standby24x7@gmail.com> Cc: Vlad Lungu <vlad.lungu@windriver.com> Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Mark Brown <broonie@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-29tty: xuartps: Fix build error when COMMON_CLK is not setSoren Brinkmann1-0/+8
Clock notifiers are only available when CONFIG_COMMON_CLK is enabled. Hence all notifier related code has to be protected by corresponsing ifdefs. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-29tty: xuartps: Fix build error due to missing forward declarationSoren Brinkmann1-14/+14
If CONFIG_PM_SLEEP is enabled and CONFIG_SERIAL_XILINX_PS_UART_CONSOLE is not, a forward declaration of the uart_driver struct is not included, leading to a build error due to an undeclared variable. Fixing this by moving the definition of the struct uart_driver before the definition of the suspend/resume callbacks. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-29tty: xuartps: Fix "may be used uninitialized" build warningSoren Brinkmann1-1/+1
Initialize varibles for which a 'may be used uninitalized' warning is issued. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-19tty: xuartps: Update copyright informationSoren Brinkmann1-1/+1
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-19tty: xuartps: Implement suspend/resume callbacksSoren Brinkmann1-0/+114
Implement suspend and resume callbacks in order to support system suspend/hibernation. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-19tty: xuartps: Dynamically adjust to input frequency changesSoren Brinkmann1-4/+119
Add a clock notifier to dynamically handle frequency changes of the input clock by reprogramming the UART in order to keep the baud rate constant. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-19tty: xuartps: Updating set_baud_rate()Soren Brinkmann1-43/+93
The original algorithm to find the best baud rate dividers does not necessarily find the best set of dividers. And in the worst case may even write illegal values to the hardware. The new function should make better use of the hardware capabilities and be able to provide valid settings for a wider range of baud rates and also input clocks. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-19tty: xuartps: Force enable the UART in xuartps_console_writeLars-Peter Clausen1-1/+11
It is possible that under certain circumstances xuartps_console_write is entered while the UART disabled. When this happens the code will busy loop in xuartps_console_putchar, since the character is never written and the TXEMPTY flag is never set. The result is a system lockup. This patch force enables the UART for the duration of xuartps_console_write to avoid this. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: John Linn <john.linn@xilinx.com> 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>
2013-10-19tty: xuartps: support 64 byte FIFO sizeSuneel1-7/+23
Changes to use the 64 byte FIFO depth and fix the issue by clearing the txempty interrupt in isr status for tx after filling in data in start_tx function Signed-off-by: Suneel Garapati <suneelg@xilinx.com> Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-19tty: xuartps: Add polled mode support for xuartpsVlad Lungu1-0/+52
This allows KDB/KGDB to run. Signed-off-by: Vlad Lungu <vlad.lungu@windriver.com> Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-19tty: xuartps: Implement BREAK detection, add SYSRQ supportVlad Lungu1-1/+49
The Cadence UART does not do break detection, even if the datasheet says it does. This patch adds break detection in software (tested in 8N1 mode only) and enables SYSRQ, allowing for Break-g to enter KDB and all the other goodies. Signed-off-by: Vlad Lungu <vlad.lungu@windriver.com> Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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