提交 · 6ee04c6c5488b2b7fdfa22c771c127411f86e610 · openeuler / Kernel

20 10月, 2013 4 次提交

tty: xuartps: Add polled mode support for xuartps · 6ee04c6c

由 Vlad Lungu 提交于 10月 17, 2013

This allows KDB/KGDB to run.
Signed-off-by: NVlad Lungu <vlad.lungu@windriver.com>
Signed-off-by: NSoren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

6ee04c6c

tty: xuartps: Implement BREAK detection, add SYSRQ support · 0c0c47bc

由 Vlad Lungu 提交于 10月 17, 2013

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: NVlad Lungu <vlad.lungu@windriver.com>
Signed-off-by: NSoren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

0c0c47bc

tty: xuartps: Use devm_kzalloc · c03cae17

由 Soren Brinkmann 提交于 10月 17, 2013

Use the device managed interface for memory allocation, simplifying
error paths.
Signed-off-by: NSoren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

c03cae17

tty: xuartps: Use devm_clk_get() · 991fc259

由 Soren Brinkmann 提交于 10月 17, 2013

Use the device managed interface for clocks, simplifying error paths.
Signed-off-by: NSoren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

991fc259

18 10月, 2013 3 次提交

tty/serial: at91: add a fallback option to determine uart/usart property · 731d9cae

由 Nicolas Ferre 提交于 10月 17, 2013

On older SoC, the "name" field is not filled in the register map.
Fix the way to figure out if the serial port is an uart or an usart for these
older products (with corresponding properties).
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

731d9cae

tty/serial: at91: fix uart/usart selection for older products · 892db58b

由 Nicolas Ferre 提交于 10月 17, 2013

Since commit 055560b0 (serial: at91:
distinguish usart and uart) the older products which do not have a
name field in their register map are unable to use their serial output.
As the main console output is usually the serial interface (aka DBGU) it
is pretty unfortunate.
So, instead of failing during probe() we just silently configure the serial
peripheral as an uart. It allows us to use these serial outputs.
The proper solution is proposed in another patch.
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

892db58b

serial: 8250_pci: add support for Fintek 4, 8, and 12 port cards · 2c62a3c8

由 Greg Kroah-Hartman 提交于 10月 17, 2013

This adds support for Fintek's 4, 8, and 12 port PCIE serial cards.

Thanks to Fintek for the sample devices, and the spec needed in order to
implement this.

Cc: Amanda Ying <amanda_ying@fintek.com.tw>
Cc: Felix Shih <felix_shih@fintek.com.tw>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

2c62a3c8

17 10月, 2013 17 次提交

serial: imx: optimization: remove the workqueues for DMA · 7cb92fd2

由 Huang Shijie 提交于 10月 15, 2013

I worried that the delay of the sdma_run_channel0() maybe too long for
interrupt context, so I added the workqueues for RX/TX DMA.

But tested with bluetooth device, I find that the delay of sdma_run_channel0()
is about 8us (tested in imx6dl sabreauto board). I think the delay
is acceptable.

This patch removes the RX/TX workqueues for DMA, it makes the
code more clear.
Signed-off-by: NHuang Shijie <b32955@freescale.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

7cb92fd2

serial: imx: use the dmaengine_tx_status · f0ef8834

由 Huang Shijie 提交于 10月 11, 2013

Use the dmaengine_tx_status to simplify the code, do not change any logic.
Signed-off-by: NHuang Shijie <b32955@freescale.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

f0ef8834

serial: imx: fix the wrong number of scatterlist entries when xmit->head is 0 · 947c74eb

由 Huang Shijie 提交于 10月 11, 2013

When the (xmit->tail > xmit->head) is true and the xmit->head is 0,
we only need one DMA scatterlist in actually. Current code uses two DMA
scatterlists in this case, this is obviously wrong.

This patch fixes it.
Signed-off-by: NHuang Shijie <b32955@freescale.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

947c74eb

serial: imx: check the DMA for imx_tx_empty · 1ce43e58

由 Huang Shijie 提交于 10月 11, 2013

Assume the following situation:

  If the DMA is enabled, and the a TX DMA operation is working,
But we have not issued the TX DMA operation (or we have issued the
TX DMA operation with dma_async_issue_pending(), but the DMA has not
started to move the data from the memory to the TXFIFO).

At this time, we may get the wrong status of the transmitter when we
call the imx_tx_empty. In such situation, only check the USR2_TXDC
does not enough for us.

This patch checks the DMA's situation, and return 0 when the TX DMA is
working.
Signed-off-by: NHuang Shijie <b32955@freescale.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

1ce43e58

serial: imx: implement the flush_buffer hook · eb56b7ed

由 Huang Shijie 提交于 10月 11, 2013

The current driver does not implement the flush_buffer hook for
uart_ops. When we enable the DMA for the driver, and test it with Bluetooth,
we may meet the following bug for TX:

    [1] User application may call the flush operation at any time.
        The uart_flush_buffer() calls the uart_circ_clear() to set
        the xmit->head and xmit->tail with 0.

    [2] The TX DMA callback can be called at any time too.
        The dma_tx_call() will update the xmit->tail.

    If [2] occurs just after the [1], we will get the wrong xmit->tail.

This patch implements the flush_buffer hook to fix this issue.
Signed-off-by: NHuang Shijie <b32955@freescale.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

eb56b7ed

serial: core: delete .set_wake() callback · fa2b5ea0