- 07 Feb, 2016 40 commits
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Phillip Raffeck authored
This patch replaces printk by the corresponding variant of dev_* in order to fix checkpatch warnings. If no suitable device pointer is present, the corresponding pr_* variant is used. Signed-off-by:
Phillip Raffeck <phillip.raffeck@fau.de> Signed-off-by:
Anton Würfel <anton.wuerfel@fau.de> Reviewed-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: linux-kernel@i4.cs.fau.de Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Anton Wuerfel authored
Merged user-visible multi-line strings into a single line according to the Linux Kernel Coding Style, which allows user-visible strings to exceed the maximum line length of 80 characters. The main reason for this is to facilitate grepping for these strings. However, some strings were ignored in this patch, because the use of format specifiers breaks the ability to grep anyway. Signed-off-by:
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Anton Wuerfel authored
This patch fixes a checkpatch warning caused by missing parentheses in the definition of a macro. Furthermore redundant parentheses are removed in an assignment. Signed-off-by:
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Anton Wuerfel authored
Fixed checkpatch warning about an unnecessary line continuation in a multi-line variable assignment. Signed-off-by:
Peter Hurley <peter@hurleysoftware.com> Cc: linux-kernel@i4.cs.fau.de Signed-off-by:
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Anton Wuerfel authored
This patch moves EXPORT_SYMBOL macros directly after the definition of the corresponding symbol to remove checkpatch warnings. Signed-off-by:
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Anton Wuerfel authored
This patch fixes checkpatch warnings about unnecessary else blocks after return statements. Signed-off-by:
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Anton Wuerfel authored
Checkpatch outputs some warnings about incorrect comment style, which is fixed by this patch. Signed-off-by:
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Anton Wuerfel authored
This patch fixes a checkpatch warning by moving an opening curly brace to its correct position. Signed-off-by:
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Anton Wuerfel authored
Indentation is changed to match the correct format of using tabs instead of spaces wherever possible. Signed-off-by:
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Anton Wuerfel authored
This patch fixes whitespace errors reported by checkpatch to increase readability. Main focus is on missing spaces after commas in function headers and macros (like foo,bar edited to foo, bar). Signed-off-by:
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Maciej W. Rozycki authored
Transmit interrupts are disabled and the transmit buffer drained in the course of console output so that polled transmission is possible. That however causes a lost transmit interrupt as the TxIP bit in RR3 is only set on a transmit buffer full-to-empty transition and then iff transmit interrupts are enabled at the same time. Consequently if console output disturbs a regular transmission in progress, the TxIP bit is never set again and the transmission locks up waiting for a transmit interrupt. Fix the problem by restarting transmission manually rather than waiting for a transmit interrupt that will never happen. Signed-off-by:
Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by:
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Martin Sperl authored
The bcm2835 SOC contains an auxiliary uart, which is very close to the ns16550 with some differences. The big difference is that the uart HW is not using an internal divider of 16 but 8, which results in an effictive baud-rate being twice the requested baud-rate. This driver handles this device correctly and handles the difference in the HW divider by scaling up the clock by a factor of 2. The approach to write a separate (wrapper) driver instead of using a multiplying clock and "ns16550" as compatibility in the device-tree has been recommended by Stephen Warren. Signed-off-by:
Martin Sperl <kernel@martin.sperl.org> Acked-by:
Eric Anholt <eric@anholt.net> Signed-off-by:
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Martin Sperl authored
Add binding documentation for the bcm2835-aux-uart driver. Signed-off-by:
Rob Herring <robh@kernel.org> Acked-by:
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Wang Dongsheng authored
Suspend/resume functions should work for 8250_of driver. Signed-off-by:
Wang Dongsheng <dongsheng.wang@nxp.com> Signed-off-by:
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Jean Delvare authored
DRIVER_NAME is too generic to be used in a driver-specific platform data file. Use a name specific to the driver instead, to avoid collisions. Signed-off-by:
Jean Delvare <jdelvare@suse.de> Acked-by:
Tony Lindgren <tony@atomide.com> Cc: Jiri Slaby <jslaby@suse.com> Signed-off-by:
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Rich Felker authored
The uartlite driver suffers from missing/duplicate/corrupted character data when the interrupt handler runs concurrently with access to the device from another cpu. Take the port spinlock to exclude concurrent access. Signed-off-by:
Rich Felker <dalias@libc.org> Signed-off-by:
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Rich Felker authored
Microblaze currently uses the old earlyprintk system, rather than the unified earlycon support, to show boot messages on uartlite. Add earlycon support so that other archs using uartlite can benefit from it. The new code in uartlite.c is copied almost verbatim from arch/microblaze/kernel/early_printk.c. Signed-off-by:
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Paul Gortmaker authored
The Kconfig currently controlling compilation of this code is: drivers/tty/serial/8250/Kconfig:config SERIAL_8250_INGENIC drivers/tty/serial/8250/Kconfig: bool "Support for Ingenic SoC serial ports" ...meaning that it currently is not being built as a module by anyone. Lets remove the modular code that is essentially orphaned, so that when reading the driver there is no doubt it is builtin-only. We explicitly disallow a driver unbind, since that doesn't have a sensible use case anyway, and it allows us to drop the ".remove" code for non-modular drivers. Since module_platform_driver() uses the same init level priority as builtin_platform_driver() the init ordering remains unchanged with this commit. Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code. We also delete the MODULE_LICENSE tag etc. since all that information was (or is now) contained at the top of the file in the comments. Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jiri Slaby <jslaby@suse.com> Cc: Matt Redfearn <matt.redfearn@imgtec.com> Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Paul Burton <paul.burton@imgtec.com> Cc: Peter Hurley <peter@hurleysoftware.com> Cc: linux-serial@vger.kernel.org Signed-off-by:
Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by:
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Simon Horman authored
Simply document new compat strings. There appears to be no need for a driver updates. Signed-off-by:
Simon Horman <horms+renesas@verge.net.au> Signed-off-by:
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Jeffy Chen authored
Currently, when tring to set up a serial console with a higher baud rate, it would fallback to 921600. Tested-by:
Jianqun Xu <jay.xu@rock-chips.com> Signed-off-by:
Jeffy Chen <jeffy.chen@rock-chips.com> Reviewed-by:
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Geert Uytterhoeven authored
Add support for sparse variable sampling rates on SCIFA and SCIFB. According to the datasheet, sampling rate 1/5 needs a small quirk to avoid corrupting the first byte received. This increases the range and accuracy of supported baud rates. E.g. on r8a7791/koelsch: - Supports now 134, 150, and standard 500000-4000000 bps, - Perfect match for 134, 150, 500000, 1000000, 2000000, and 4000000 bps, - Accuracy has increased for most standard bps values. Signed-off-by:Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by:
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Geert Uytterhoeven authored
Replace the single sampling rate and special handling for HSCIF's variable sampling rates by a bitmask and a custom iterator. This prepares for the advent of SCIFA/SCIFB's sparse variable sampling rates. Signed-off-by:
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Geert Uytterhoeven authored
On SCIx variants different from HSCIF, the bit rate is equal to the sampling clock rate divided by half the sampling rate. Currently this is handled by dividing the sampling rate by two, which was OK as it was always even. Replace halving the sampling rate by premultiplying the base clock frequency by 2, to accommodate odd sampling rates on SCIFA/SCIFB later. Replace the shift value in the BRG divider calculation by a premultiplication of the base clock frequency too, for consistency. Signed-off-by:
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Geert Uytterhoeven authored
SCIFA and SCIFB have additional bit rate config bits in the Serial Mode Register. Don't touch them when using the port as a serial console, as we rely on the boot loader to have configured the serial port config. Signed-off-by:
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Geert Uytterhoeven authored
Signed-off-by:
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Martin Fuzzey authored
When a non console i.MX UART is enabled in the device tree, system suspend fails due to an unprepared clock: [ 638.794563] PM: Syncing filesystems ... done. [ 638.878902] Freezing user space processes ... (elapsed 0.002 seconds) done. [ 638.888454] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done. [ 638.996697] PM: suspend of devices complete after 97.200 msecs [ 639.002611] PM: suspend devices took 0.100 seconds [ 639.013020] PM: late suspend of devices complete after 2.288 msecs [ 639.021486] ------------[ cut here ]------------ [ 639.026147] WARNING: CPU: 0 PID: 488 at drivers/clk/clk.c:732 clk_core_enable+0xc0/0x12c() [ 639.034413] Modules linked in: [ 639.037490] CPU: 0 PID: 488 Comm: system_server Tainted: G W 4.4.0-rc5-pknbsp-svn2214-atag-v4.4-rc5-121-gebfd9cb #1304 [ 639.049312] Hardware name: Freescale i.MX53 (Device Tree Support) [ 639.055444] [<c0016d54>] (unwind_backtrace) from [<c00140f8>] (show_stack+0x20/0x24) [ 639.063199] [<c00140f8>] (show_stack) from [<c02c99a0>] (dump_stack+0x20/0x28) [ 639.070442] [<c02c99a0>] (dump_stack) from [<c0024ca8>] (warn_slowpath_common+0x88/0xc0) [ 639.078541] [<c0024ca8>] (warn_slowpath_common) from [<c0024d0c>] (warn_slowpath_null+0x2c/0x34) [ 639.087332] [<c0024d0c>] (warn_slowpath_null) from [<c05171e8>] (clk_core_enable+0xc0/0x12c) [ 639.095777] [<c05171e8>] (clk_core_enable) from [<c05172f8>] (clk_enable+0x2c/0x40) [ 639.103441] [<c05172f8>] (clk_enable) from [<c0349880>] (imx_serial_port_suspend_noirq+0x20/0xe0) [ 639.112336] [<c0349880>] (imx_serial_port_suspend_noirq) from [<c03a26a0>] (dpm_run_callback+0x68/0x16c) [ 639.121825] [<c03a26a0>] (dpm_run_callback) from [<c03a2898>] (__device_suspend_noirq+0xf4/0x22c) [ 639.130705] [<c03a2898>] (__device_suspend_noirq) from [<c03a4b0c>] (dpm_suspend_noirq+0x148/0x30c) [ 639.139764] [<c03a4b0c>] (dpm_suspend_noirq) from [<c00511d4>] (suspend_devices_and_enter+0x2e8/0x6a4) [ 639.149078] [<c00511d4>] (suspend_devices_and_enter) from [<c00518a0>] (pm_suspend+0x310/0x4b8) [ 639.157782] [<c00518a0>] (pm_suspend) from [<c00500ec>] (state_store+0x7c/0xcc) [ 639.165099] [<c00500ec>] (state_store) from [<c02cb6dc>] (kobj_attr_store+0x1c/0x28) [ 639.172858] [<c02cb6dc>] (kobj_attr_store) from [<c01633d4>] (sysfs_kf_write+0x54/0x58) [ 639.180871] [<c01633d4>] (sysfs_kf_write) from [<c01629b4>] (kernfs_fop_write+0x100/0x1c8) [ 639.189152] [<c01629b4>] (kernfs_fop_write) from [<c00fb8b8>] (__vfs_write+0x3c/0xe8) [ 639.196991] [<c00fb8b8>] (__vfs_write) from [<c00fc810>] (vfs_write+0xa4/0x160) [ 639.204307] [<c00fc810>] (vfs_write) from [<c00fcac4>] (SyS_write+0x4c/0x98) [ 639.211363] [<c00fcac4>] (SyS_write) from [<c0010760>] (ret_fast_syscall+0x0/0x3c) This does not happen for the common case of a single UART used as a console (since imx_console_setup() already does a prepare) Signed-off-by:
Martin Fuzzey <mfuzzey@parkeon.com> Signed-off-by:
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Soren Brinkmann authored
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:
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Soren Brinkmann authored
Remove the _OFFSET suffix from all register defines which makes code a little easier to read and avoids a few line breaks. Suggested-by:
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Soren Brinkmann authored
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:
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Soren Brinkmann authored
Convert an if-else into the more common early return on error, reducing the indent level of the happy path. Signed-off-by:
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Soren Brinkmann authored
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:
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Soren Brinkmann authored
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:
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Soren Brinkmann authored
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:
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Soren Brinkmann authored
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:
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Soren Brinkmann authored
The RX path in the interrupt handler released a lock unnecessarily. Signed-off-by:
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Soren Brinkmann authored
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:
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Soren Brinkmann authored
When shutting down the UART, clear the interrupt status register. Bits in the ISR are cleared by writing them as '1'. Signed-off-by:
Moritz Fischer <moritz.fischer@ettus.com> Signed-off-by:
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Soren Brinkmann authored
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:
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Soren Brinkmann authored
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:
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Soren Brinkmann authored
Non-functional, formatting changes to ease reading the code. Signed-off-by:
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