- 09 Jan, 2015 40 commits
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Robert Baldyga authored
Add functions requesting and releasing RX and TX DMA channels. This function are called only when "dmas" property in serial device-tree node is defined. Based on previous work of Sylwester Nawrocki and Lukasz Czerwinski. Signed-off-by:
Robert Baldyga <r.baldyga@samsung.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Robert Baldyga authored
This macro definitions are necessary to implement DMA transfers is samsung serial driver. Based on previous work of Sylwester Nawrocki and Lukasz Czerwinski. Signed-off-by:
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Robert Baldyga authored
When we have "dmas" property in serial node in device-tree, we do memory alocation for dma structure which will be used in DMA handling code. Based on previous work of Sylwester Nawrocki and Lukasz Czerwinski. Signed-off-by:
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Robert Baldyga authored
This struct contains DMA configuration for each serial port. It will be used in next commits adding DMA support in driver. Based on previous work of Sylwester Nawrocki and Lukasz Czerwinski. Signed-off-by:
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Jiada Wang authored
This patch adds Software flow control support in DMA mode. Signed-off-by:
Jiada Wang <jiada_wang@mentor.com> Signed-off-by:
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Jiada Wang authored
After send out x_char in UART driver, x_char needs to be cleared by UART driver itself, otherwise data in TXFIFO can no longer be sent out. Also tx counter needs to be increased to keep track of correct number of transmitted data. Signed-off-by:
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Jiada Wang authored
Other than enable Receiver Overrun Interrupt Enable (UCR4_OREN) in start_tx interface, UCR4_OREN should be enabled before enable of Receiver. Signed-off-by:
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Robin Gong authored
Start rx_dma once RXFIFO is not empty that can avoid dma request lost and causes data delay issue. Signed-off-by:
Robin Gong <b38343@freescale.com> Signed-off-by:
Fugang Duan <B38611@freescale.com> Signed-off-by:
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Anton Bondarenko authored
DMA mode for UART can be used even w/o HW flow control with RTS/CTS. So it need to be initialized and enabled earlier. Signed-off-by:
Anton Bondarenko <anton_bondarenko@mentor.com> Signed-off-by:
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Dirk Behme authored
Terminating the DMA, make sure the interrupt is disabled, too. This fixes random kernel Oops due to dma_tx_call() called for invalid transmissions. If we disable the TDMAEN, make sure it's enabled again if a TX DMA is started. Signed-off-by:
Dirk Behme <dirk.behme@de.bosch.com> Signed-off-by:
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Jiada Wang authored
Currently in dma_tx_callback(), no matter if there is still remaining data pending in circle buffer or not, DMA transmit will be terminated. This will result in some data never get transmitted. In order to fix this issue, call imx_dma_tx() again in dma_tx_callback, when there is pending data and uart hasn't been stopped. Signed-off-by:
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Jiada Wang authored
This reverts commit 2ad28e3e. Instead of always wake up write_wait process in TX callback, TX callback should call imx_dma_tx() again, and let imx_dma_tx transfer the remaining data in circle buffer. The issue with commit 2ad28e3e is, in case there is remaining data in circle buffer, but no process is waiting on write_wait queue, then as no following uart_write() will be called after uart_write_wakeup(), thus cause data loss. Moreover according to Documentation/serial/driver, uart_write_wakeup() should be called in case the transmit buffer have dropped below a threshold. Signed-off-by:
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Dirk Behme authored
To synchronize between dma_tx_callback() and imx_dma_tx() use the same variable, dma_is_txing. This prevents any race between these two functions and ensures that a new DMA can start only after the first has been finished. Before the new DMA can be set up, update the circular buffer logic, first. Therefore, change dma_is_txing after that update, instead of before. While doing this, in dma_tx_callback() extend the locking to dma_unmap_sg() and the update of dma_is_txing. Signed-off-by:
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Dirk Behme authored
First, reformat the code to exit immediately. This allows us to add more code in more readable format. In case the TX DMA was still running, remove and disable it's resources. Signed-off-by:
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Dirk Behme authored
In case dmaengine_prep_slave_sg() fails, add the missing dma_unmap_sg(). Signed-off-by:
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Dirk Behme authored
Inverting the logic of the if statement for the sg initialization makes the if statement easier and better to read. No functional change. Signed-off-by:
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Dirk Behme authored
Use imx_start_tx() just to enable the TX interrupt. It's the job of the TX interrupt ISR to fill the transmit buffer, then. If the transmit buffer is empty, the TX interrupt should be executed as soon as the start_tx() enables the interrupt, so there is no reason for the extra imx_transmit_buffer() call, here. Remove it. Signed-off-by:
Andy Lowe <andy_lowe@mentor.com> Signed-off-by:
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Jiada Wang authored
Several places are accessing the UCR1 register without locking. This probably will cause a race issue when another thread is accessing the same register. Add locking to preventing concurrent access of the UCR1 register. Signed-off-by:
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Jiada Wang authored
Add CREAD flag hanlding in set_termios and UART DMA mode which ignores all received chars when CREAD flag cleared. Signed-off-by:
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Cyrille Pitchen authored
Signed-off-by:
Cyrille Pitchen <cyrille.pitchen@atmel.com> Acked-by:
Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by:
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Cyrille Pitchen authored
This patch fixes many bugs in the code dealing with the hardware handshake. As an example, in atmel_set_termios(), we used to test whether the CRTSCTS c_cflag was set. If so, we selected the "Hardware Handshake" mode through the Mode Register. However, few lines below the mode was reset to "Normal" (0). So there was no way to select the "Hardware Handshake" mode. To fix this issue, we moved the CRTSCRTS c_cflag test AFTER the mode has been reset to "Normal". Also setting the RTSEN and RTSDIS bits in the Control Register has different results whether the USART is set in "Normal" or "Hardware Handshake" mode: 1) "Normal" mode - the RTSEN bit forces the RTS line to low level, which tells the remote peer that we are ready to received new data. - the RTSDIS bit forces the RTS line to high level, which tells the remote peer to stop sending new data. 2) "Hardware Handshake" mode - the RTSEN bit forces the RTS line to high level. - the RTSDIS bit lets the hardware control the RTS line. WARNING: when FIFOs are not available or not enabled, the RTS line is controlled by the PDC. This is why using the Hardware Handshake mode requires using the PDC channel for reception. However the Hardware Handshake mode DOES NOT work with DMA controller since it cannot control the RTS line. Future designs with FIFOs will introduce a new feature: the RTS line will be controlled by the RX FIFO using thresholds. This patch was tested with this new design. Signed-off-by:
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Cyrille Pitchen authored
-EDEFER error wasn't handle properly by atmel_serial_probe(). As an example, when atmel_serial_probe() is called for the first time, we pass the test_and_set_bit() test to check whether the port has already been initalized. Then we call atmel_init_port(), which may return -EDEFER, possibly returned before by clk_get(). Consequently atmel_serial_probe() used to return this error code WITHOUT clearing the port bit in the "atmel_ports_in_use" mask. When atmel_serial_probe() was called for the second time, it used to fail on the test_and_set_bit() function then returning -EBUSY. When atmel_serial_probe() fails, this patch make it clear the port bit in the "atmel_ports_in_use" mask, if needed, before returning the error code. Signed-off-by:
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Cyrille Pitchen authored
atmel_serial_probe() calls atmel_init_port(). In turn, atmel_init_port() calls clk_disable_unprepare() to disable the peripheral clock before returning. Later atmel_serial_probe() accesses some I/O registers such as the Mode and Control registers for RS485 support then the Name and Version registers, through a call to atmel_get_ip_name(), but at that moment the peripheral clock was still disabled. Signed-off-by:
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Cyrille Pitchen authored
dma_sync_*_for_cpu() and dma_sync_*_for_device() use 'enum dma_data_direction', not 'enum dma_transfer_direction' Signed-off-by:
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Barry Song authored
MARCO will not be supported any more and the project was dropped. it has been replaced by CSR atlas7. Signed-off-by:
Barry Song <Baohua.Song@csr.com> Signed-off-by:
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Peter Hurley authored
Commit 2aff5e2b ('tty: Change tty lock order to master->slave') added a warning which is broken and unnecessary now that the tty lock has fixed lock subclasses, added in commit 2febdb63 ('tty: Preset lock subclass for nested tty locks'). Reported-by:
Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
Peter Hurley <peter@hurleysoftware.com> Signed-off-by:
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Wolfram Sang authored
This platform_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by:
Wolfram Sang <wsa@the-dreams.de> Signed-off-by:
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Feng Kan authored
Enable APM X-Gene SoC serial port functionality when using ACPI table to initialize serial port. Signed-off-by:
Feng Kan <fkan@apm.com> Signed-off-by:
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Andy Shevchenko authored
There is no need to terminate transfer in the __dma_rx_complete() since it's called at the end of transfer. Special case when serial timeout occurs is handled separately where we have to terminate transfer. Signed-off-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by:
Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by:
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Fabio Estevam authored
By using devm_request_irq() we can have a shorter and cleaner code. Signed-off-by:
Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by:
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Fabio Estevam authored
By using devm_clk_get() we can have a shorter and cleaner code. Signed-off-by:
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Fabio Estevam authored
By using devm_kzalloc() we can have a shorter and cleaner code. Signed-off-by:
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Fabio Estevam authored
Instead of jumping to the 'out' label, let's return the error immediately, which makes the code shorter and cleaner. Signed-off-by:
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Peter Hurley authored
Because the OMAP3 UART ignores MCR[1] (RTS) in autoRTS mode, autoRTS mode must not be enabled unless RTS is set (or port->mctrl & TIOCM_RTS, which is equivalent). Fixes premature raising of RTS in omap_8250_set_termios() -- RTS was raised even before UART mode was selected. Fixes raise of RTS after port has been shutdown; omap_8250_pm() re-enabled RTS after omap_8250_shutdown(). Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by:
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Peter Hurley authored
The OMAP3 UART ignores MCR[1] (ie., UART_MCR_RTS) when in autoRTS mode (UPF_HARD_FLOW + CRTSCTS). This makes it impossible for either the serial core or userspace to manually flow control the sender. Disable autoRTS mode when RTS is lowered and restore the previous mode when RTS is raised. Note that the OMAP3 UART provides no mechanism for switching from autoRTS mode without corrupting incoming data; to access the necessary register, the line control settings must be set to 8-e-2 and thus any data received during that time will be interpreted with those settings. This corruption has been observed in practice. Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by:
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Pavel Machek authored
Trivial fixes for omap-serial. Signed-off-by:
Pavel Machek <pavel@ucw.cz> index 18c30ca..f43ed2c 100644 Signed-off-by:
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Sebastian Andrzej Siewior authored
This patch invokes add_preferred_console() with ttyS based on ttyO arguments if the user didn't specify it on its own. This ensures that the user will see the kernel booting on his serial console in case he forgot to update the command line. Signed-off-by:
Sebastian Andrzej Siewior <bigeasy@linutronix.de> Acked-by:
Alan Cox <alan@linux.intel.com> Signed-off-by:
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Greg Ungerer authored
The current output of the device probing looks like this: ColdFire internal UART serial driver (NULL device *): ttyS0 at MMIO 0xfc060000 (irq = 90, base_baud = 5208333) is a ColdFire UART console [ttyS0] enabled (NULL device *): ttyS1 at MMIO 0xfc064000 (irq = 91, base_baud = 5208333) is a ColdFire UART (NULL device *): ttyS2 at MMIO 0xfc068000 (irq = 92, base_baud = 5208333) is a ColdFire UART Fix the port device linkage at probing time so that the device name is printed out properly, and not "(NULL device *)". Signed-off-by:
Greg Ungerer <gerg@uclinux.org> Signed-off-by:
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Greg Ungerer authored
Trivially fix the following compile time warnings: CC drivers/tty/serial/mcf.o drivers/tty/serial/mcf.c: In function ‘mcf_set_termios’: drivers/tty/serial/mcf.c:201:19: warning: unused variable ‘pp’ drivers/tty/serial/mcf.c: In function ‘mcf_config_rs485’: drivers/tty/serial/mcf.c:444:19: warning: unused variable ‘pp’ Signed-off-by:
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Greg Ungerer authored
Change my email contact address from the obsolete gerg@snapgear.com to gerg@uclinux.org. Signed-off-by:
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