提交 · b4756f4f0d773c31e59f203e7f19fd3d5c490193 · openeuler / raspberrypi-kernel

10 9月, 2014 4 次提交

tty: serial: 8250: Add Mediatek UART driver · b4756f4f

由 Matthias Brugger 提交于 9月 09, 2014

The device has a highspeed register which influences the calcualtion
of the divisor. The chip lacks support for some baudrates. When requested,
we set the divisor to the next smaller baudrate and adjust the c_cflag
accordingly.
Signed-off-by: NMatthias Brugger <matthias.bgg@gmail.com>
Reviewed-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

b4756f4f

serial: asc: Adopt readl_/writel_relaxed() · 08177ece

由 Daniel Thompson 提交于 9月 09, 2014

The architectures supported by this driver, arm and sh, have expensive
implementations of writel(), reliant on spin locks and explicit L2 cache
management. These architectures provide a cheaper writel_relaxed() which
is much better suited to peripherals that do not perform DMA. The
situation with readl()/readl_relaxed()is similar although less acute.

This driver does not use DMA and will be more power efficient and more
robust (due to absence of spin locks during console I/O) if it uses the
relaxed variants.

The driver supports COMPILE_TEST and therefore falls back to writel()
when writel_relaxed() does not exist.
Signed-off-by: NDaniel Thompson <daniel.thompson@linaro.org>
Acked-by: NSrinivas Kandagatla <srinivas.kandagatla@gmail.com>
Cc: Maxime Coquelin <maxime.coquelin@st.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: kernel@stlinux.com
Cc: linux-serial@vger.kernel.org
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

08177ece

serial: clps711x: Fix COMPILE_TEST build for target without GPIOLIB support · efb08951

由 Alexander Shiyan 提交于 9月 09, 2014

The patch fixes the following build error of CLPS711X serial driver for
targets without GPIOLIB support:

>> drivers/tty/serial/serial_mctrl_gpio.c:44:6: error: redefinition of 'mctrl_gpio_set'
  void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
      ^
  In file included from drivers/tty/serial/serial_mctrl_gpio.c:23:0:
  drivers/tty/serial/serial_mctrl_gpio.h:80:6: note: previous definition of 'mctrl_gpio_set' was here
  void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
      ^
Reported-by: Nkbuild test robot <fengguang.wu@intel.com>
Signed-off-by: NAlexander Shiyan <shc_work@mail.ru>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

efb08951

serial/8250_core: Add reference to uacess.h · 0b4af1d9

由 Ricardo Ribalda Delgado 提交于 9月 09, 2014

Commit: e676253b [3/21] serial/8250: Add
support for RS485 IOCTLs, adds a building error on arch m32r.

All error/warnings:

   drivers/tty/serial/8250/8250_core.c: In function 'serial8250_ioctl':
>> drivers/tty/serial/8250/8250_core.c:2859:3: error: implicit declaration of function 'copy_from_user' [-Werror=implicit-function-declaration]
      if (copy_from_user(&rs485_config, (void __user *)arg,
      ^
>> drivers/tty/serial/8250/8250_core.c:2871:3: error: implicit declaration of function 'copy_to_user' [-Werror=implicit-function-declaration]
      if (copy_to_user((void __user *)arg, &up->rs485,
      ^
   cc1: some warnings being treated as errors
Reported-by: Nkbuild test robot <fengguang.wu@intel.com>
Signed-off-by: NRicardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

0b4af1d9

09 9月, 2014 36 次提交

tty: serial: 8250_core: allow to overwrite & export serial8250_startup() · b99b121b

由 Sebastian Andrzej Siewior 提交于 9月 05, 2014

The OMAP version of the 8250 can actually use 1:1 serial8250_startup().
However it needs to be extended by a wake up irq which should to be
requested & enabled at ->startup() time and disabled at ->shutdown() time.

v2…v3: properly copy callbacks
v1…v2: add shutdown callback
Acked-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

b99b121b

tty: serial: 8250_core: provide a function to export uart_8250_port · ae14a795

由 Sebastian Andrzej Siewior 提交于 9月 05, 2014

There is no way to access a struct uart_8250_port for a specific
line. This is only required outside of the 8250/uart callbacks like for
devices' suspend & remove callbacks. For those the 8250-core provides a
wrapper like serial8250_unregister_port() which passes the struct
to the proper function based on the line argument.

For run time suspend I need access to this struct not only to make
serial_out() work but also to properly restore up->ier and up->mcr.
Acked-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

ae14a795

tty/vt/keyboard: Resolve many shadow warnings · 9d329c1c

由 Mark Rustad 提交于 9月 05, 2014

Many local variables were given the same name as a global. This
is valid, but generates many shadow warnings in W=2 builds. Resolve
them by changing the local names. Also change local variables
named "up" because they shadow the semaphore "up" function. Also
moved the outer declaration of the variable "a" because it is
only used in one block, and that resolves all of the shadow warnings
for the other declarations of "a" that have different types.

Change diacr => dia, kbd => kb, rep => rpt, up => udp.
Signed-off-by: NMark Rustad <mark.d.rustad@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

9d329c1c

tty: vt8500_serial: explicitly calculate base baud rate · 5aa387c1

由 Alexey Charkov 提交于 9月 06, 2014

Current code relies on the UART clock pre-divisor to be already
configured in the baud rate register. Calculate it in the driver
and set explicitly instead, also return the "real" effective baud
rate, which is generally slightly different from the requested value.

While at this, also ensure that break signal timing is updated when
baud rate changes.
Signed-off-by: NAlexey Charkov <alchark@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

5aa387c1

tty: vt8500_serial: add polled console functions · 1db894ec

由 Alexey Charkov 提交于 9月 06, 2014

This adds simple polling functions for single-character transmit
and receive, as used by kgdb.
Signed-off-by: NAlexey Charkov <alchark@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

1db894ec

tty: vt8500_serial: add missing support for RTS setting · 8c986d3e

由 Alexey Charkov 提交于 9月 06, 2014

Signed-off-by: NAlexey Charkov <alchark@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

8c986d3e

tty: vt8500_serial: add support for UART in WM8880 chips · ae382735

由 Alexey Charkov 提交于 9月 06, 2014

Newer WonderMedia chips introduced another flag in the UART line control
register, which controls whether RTS/CTS signalling should be handled in
the driver or by the hardware itself.

This patch ensures that the kernel can control RTS/CTS (including
disabling it altogether) by forcing this flag to software mode on affected
chips (only WM8880 so far).

Also remove the redundant copy of the binding doc, while we are here.
Signed-off-by: NAlexey Charkov <alchark@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

ae382735

serial: kgdb_nmi: No CON_ENABLED by default · 287f03c0

由 Daniel Thompson 提交于 9月 03, 2014

At present this console is optionally registered by NULL checking
arch_kgdb_ops.enable_nmi. In practice this requires the architecture
dependant code to implement some kind of control (e.g. module arguments)
to enable/disable this feature.

The kernel already provides us the perfectly adequate console= argument
to enable/disable consoles. Let's use that instead!
Signed-off-by: NDaniel Thompson <daniel.thompson@linaro.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: linux-serial@vger.kernel.org
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

287f03c0

serial: amba-pl011: Use container_of() to get uart_amba_port · a5820c24

由 Daniel Thompson 提交于 9月 03, 2014

Universally adopt container_of() for all pointer conversion from
uart_port to uart_amba_port.
Signed-off-by: NDaniel Thompson <daniel.thompson@linaro.org>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: linux-serial@vger.kernel.org
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

a5820c24

serial: imx: clean up imx_poll_get_char() · 26c47412

由 Dirk Behme 提交于 9月 03, 2014

Looking at the get_poll_char() function of the 8250.c serial driver,
we learn:

* poll_get_char() doesn't have to save/disable/restore the interrupt
  registers. No interrupt handling is needed in this function at all.
  Remove it.

* Don't block in case there is no data available. So instead blocking
  in the do {} while loop, just return with NO_POLL_CHAR, immediately .

Additionally, while the i.MX6 register URXD[7-0] contain the RX_DATA,
the upper bits of this register (URXD[15-10]) might contain some
control flags. To ensure that these are not returned with the data
read, just mask out URXD[7-0].

These changes fix the 'hang' working with kdb:

$ echo ttymxc3 > /sys/module/kgdboc/parameters/kgdboc
$ echo g >/proc/sysrq-trigger
[0]kdb> help
...
<hang>
Signed-off-by: NDirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: NDaniel Thompson <daniel.thompson@linaro.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: linux-serial@vger.kernel.org
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

26c47412

serial: core: Unwrap tertiary assignment in uart_handle_dcd_change() · c993257b