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path: root/drivers/tty/serial
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2015-11-09Revert "serial: 8250_dma: don't bother DMA with small transfers"Frederic Danis
commit f967fc8f165fadb72166f2bd4785094b3ca21307 upstream. This reverts commit 9119fba0cfeda6d415c9f068df66838a104b87cb. This commit prevents from sending "big" file using Bluetooth. When sending a lot of data quickly through the Bluetooth interface, and after a variable amount of data sent, transfer fails with error: kernel: [ 415.247453] Bluetooth: hci0 hardware error 0x00 Found on T100TA. After reverting this commit, send works fine for any file size. Signed-off-by: Frederic Danis <frederic.danis@linux.intel.com> Fixes: 9119fba0cfed (serial: 8250_dma: don't bother DMA with small transfers) Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-10-22serial: atmel: fix error path of probe functionUwe Kleine-König
commit 8f1bd8f2ad2358d6a88c115481ff3e69817d1bde upstream. If atmel_init_gpios fails the port has already been marked as busy (in line 2629), so this must be undone in the error path. This bug was introduced because I created the patch that finally became 722ccf416ac2 ("serial: atmel: fix error handling when mctrl_gpio_init fails") on top of 3.19 which didn't have commit 6fbb9bdf0f3f ("tty/serial: at91: fix error handling in atmel_serial_probe()") yet. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Fixes: 722ccf416ac2 ("serial: atmel: fix error handling when mctrl_gpio_init fails") Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-10-22serial: 8250: add uart_config entry for PORT_RT2880Mans Rullgard
commit 3c5a0357fdb3a9116a48dbdb0abb91fd23fbff80 upstream. This adds an entry to the uart_config table for PORT_RT2880 enabling rx/tx FIFOs. The UART is actually a Palmchip BK-3103 which is found in several devices from Alchemy/RMI, Ralink, and Sigma Designs. Signed-off-by: Mans Rullgard <mans@mansr.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-09-21serial: samsung: fix DMA for FIFO smaller than cache line sizeRobert Baldyga
commit 736cd79f483fd7a1e0b71e6eaddf01d8d87fbbbb upstream. So far DMA mode were activated when only number of bytes to send was equal or greater than min_dma_size. Due to requirement that DMA transaction buffer should be aligned to cache line size, the excessive bytes were written to FIFO before starting DMA transaction. The problem occurred when FIFO size were smaller than cache alignment, because writing all excessive bytes to FIFO would fail. It happened in DMA mode when PIO interrupts disabled, which caused driver hung. The solution is to test if buffer is alligned to cache line size before activating DMA mode, and if it's not, running PIO mode to align buffer and then starting DMA transaction. In PIO mode, when interrupts are enabled, lack of space in FIFO isn't the problem, so buffer aligning will always finish with success. Reported-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Robert Baldyga <r.baldyga@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-09-21serial: samsung: fix DMA mode enter condition for small FIFO sizesMarek Szyprowski
commit 81ccb2a69f76b88295a1da9fc9484df715fe3bfa upstream. Due to some of serial ports can have FIFO size smaller than cache line size, and because of need to align DMA buffer address to cache line size, it's necessary to calculate minimum number of bytes for which we want to start DMA transaction to be at least cache line size. The simplest way to meet this requirement is to get maximum of cache line size and FIFO size. Reported-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Robert Baldyga <r.baldyga@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-09-21serial: 8250_pci: Add support for Pericom PI7C9X795[1248]Adam Lee
commit 89c043a6cb2d4525d48a38ed78d5f0f5672338b3 upstream. Pericom PI7C9X795[1248] are Uno/Dual/Quad/Octal UART devices, this patch enables them, also defines PCI_VENDOR_ID_PERICOM here. Signed-off-by: Adam Lee <adam.lee@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-09-21serial: 8250: bind to ALi Fast Infrared Controller (ALI5123)Maciej S. Szmigiero
commit 1d7002777a8fe8188caaa98d4a8eb4ed298fcdae upstream. This way this device can be used with irtty-sir - at least on Toshiba Satellite A20-S103 it is not configured by default and needs PNP activation before it starts to respond on I/O ports. This device has actually its own driver (ali-ircc), but this driver seems to be non-functional for a very long time (see http://permalink.gmane.org/gmane.linux.irda.general/484 http://permalink.gmane.org/gmane.network.protocols.obex.openobex.user/943 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=535070 ). Signed-off-by: Maciej Szmigiero <mail@maciej.szmigiero.name> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-09-21serial: 8250: don't bind to SMSC IrCC IR portMaciej S. Szmigiero
commit ffa34de03bcfbfa88d8352942bc238bb48e94e2d upstream. SMSC IrCC SIR/FIR port should not be bound to by (legacy) serial driver so its own driver (smsc-ircc2) can bind to it. Signed-off-by: Maciej Szmigiero <mail@maciej.szmigiero.name> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-09-21tty: serial: men_z135_uart.c: Fix race between IRQ and set_termios()Johannes Thumshirn
commit 8117e347406278fd399b077add4e638cd017ae2d upstream. Fix panic caused by a race between men_z135_intr() and men_z135_set_termios(). men_z135_intr() and men_z135_set_termios() both hold the struct uart_port::lock spinlock, but men_z135_intr() does a spin_lock_irqsave() and men_z135_set_termios() does a normal spin_lock(), which can lead to a deadlock when an interrupt is called while the lock is being helt by men_z135_set_termios(). This was discovered using a insmod, hardware looppback send/receive, rmmod stress test. Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Cc: Andreas Werner <andreas.werner@men.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-09-21tty: serial: 8250_omap: do not use RX DMA if pause is not supportedSebastian Andrzej Siewior
commit 830acf9e3044d4644f91b4418ef35a2094089946 upstream. The 8250-omap driver requires the DMA-engine driver to support the pause command in order to properly turn off programmed RX transfer before the driver stars manually reading from the FIFO. The lacking support of the requirement has been discovered recently. In order to stay safe here we disable RX-DMA completly on probe. The rx_dma_broken assignment on probe could be removed once we working pause function in omap-dma. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-09-21serial: 8250_uniphier: call clk_disable_unprepare() on failure pathMasahiro Yamada
commit e70e69bf205e6d1f742f1cf1935b155417c9e29a upstream. If serial8250_register_8250_port() fails, disable and unprepare the clock before exiting. Fixes: 1a8d2903cb6a ("serial: 8250_uniphier: add UniPhier serial driver") Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-07-23serial: core: Fix crashes while echoing when closingPeter Hurley
While closing, new rx data may be received after the input buffers have been flushed but before stop_rx() halts receiving [1]. The new data might not be processed by flush_to_ldisc() until after uart_shutdown() and normal input processing is re-enabled (ie., tty->closing = 0). The race is outlined below: CPU 0 | CPU 1 | uart_close() | tty_port_close_start() | tty->closing = 1 | tty_ldisc_flush() | | => IRQ | while (LSR & data ready) | uart_insert_char() | tty_flip_buffer_push() | <= EOI stop_rx() | . uart_shutdown() | . free xmit.buf | . tty_port_tty_set(NULL) | . tty->closing = 0 | . | flush_to_ldisc() | n_tty_receive_buf_common() | __receive_buf() | ... | commit_echoes() | uart_flush_chars() | __uart_start() | ** OOPS on port.tty deref ** tty_ldisc_flush() | Input processing must be prevented from echoing (tty->closing = 1) until _after_ the input buffers have been flushed again at the end of uart_close(). [1] In fact, some input may actually be buffered _after_ stop_rx() since the rx interrupt may have already triggered but not yet been handled when stop_rx() disables rx interrupts. Fixes: 2e758910832d ("serial: core: Flush ldisc after dropping port mutex in uart_close()") Reported-by: Robert Elliott <elliott@hp.com> Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-07-23Revert "serial: imx: initialized DMA w/o HW flow enabled"David Jander
This reverts commit 068500e08dc87ea9a453cc4a500cf3ab28d0f936. According to some tests, SDMA support is broken at least for i.MX6 without HW flow control. Different forms of data-corruption appear either with the ROM firmware for the SDMA controller as well as when loading Freescale provided SDMA firmware versions 1.1 or 3.1. Signed-off-by: David Jander <david@protonic.nl> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-07-23sc16is7xx: fix FIFO address of secondary UARTBo Svangård
Calls to regmap_raw_read/write needed register rewrite in a similar way as function calls to regmap_read/write already had. This enables reading/writing the serial datastream to the device. Signed-off-by: Bo Svangård <bo.svangard@embeddedart.se> Signed-off-by: Jakub Kicinski <kubakici@wp.pl> Signed-off-by: Jon Ringle <jringle@gridpoint.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-07-23sc16is7xx: fix Kconfig dependenciesJakub Kicinski
When I2C=m and SPI=y or-ing them will produce =y while what we need is the lower bound, i.e. =m. Fortunately SPI is a boolean so we need to handle only one special case. Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Jakub Kicinski <kubakici@wp.pl> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-07-23serial: etraxfs-uart: Fix release etraxfs_uart_portsAxel Lin
In probe, we use dev_id as array index of etraxfs_uart_ports and store the index in port->line. So etraxfs_uart_ports[port->line] should be released when unload the module. Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Niklas Cassel <nks@flawful.org> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-07-23serial: amba-pl011: Fix devm_ioremap_resource return value checkKrzysztof Kozlowski
Value returned by devm_ioremap_resource() was checked for non-NULL but devm_ioremap_resource() returns IOMEM_ERR_PTR, not NULL. In case of error this could lead to dereference of ERR_PTR. Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com> Cc: <stable@vger.kernel.org> Fixes: 3873e2d7f63a ("drivers: PL011: refactor pl011_probe()") Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-07-02Merge tag 'armsoc-late' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc Pull ARM SoC late fixes and dependencies from Kevin Hilman: "This is a collection of a few late fixes and other misc stuff that had dependencies on things being merged from other trees. Other than the fixes, the primary feature being added is the conversion of some OMAP drivers to the new generic wakeirq interface" * tag 'armsoc-late' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: ARM: multi_v7_defconfig: Enable BRCMNAND driver ARM: BCM: Do not select CONFIG_MTD_NAND_BRCMNAND ARM: at91/dt: update udc compatible strings ARM: at91/dt: trivial: fix USB udc compatible string arm64: dts: Add APM X-Gene standby GPIO controller DTS entries soc: qcom: spm: Fix idle on THUMB2 kernels ARM: dove: fix legacy dove IRQ numbers ARM: mvebu: fix suspend to RAM on big-endian configurations ARM: mvebu: adjust Armada XP DT spi muxing after pinctrl function rename serial: 8250_omap: Move wake-up interrupt to generic wakeirq serial: omap: Switch wake-up interrupt to generic wakeirq mmc: omap_hsmmc: Change wake-up interrupt to use generic wakeirq
2015-06-27Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linusLinus Torvalds
Pull MIPS updates from Ralf Baechle: - Improvements to the tlb_dump code - KVM fixes - Add support for appended DTB - Minor improvements to the R12000 support - Minor improvements to the R12000 support - Various platform improvments for BCM47xx - The usual pile of minor cleanups - A number of BPF fixes and improvments - Some improvments to the support for R3000 and DECstations - Some improvments to the ATH79 platform support - A major patchset for the JZ4740 SOC adding support for the CI20 platform - Add support for the Pistachio SOC - Minor BMIPS/BCM63xx platform support improvments. - Avoid "SYNC 0" as memory barrier when unlocking spinlocks - Add support for the XWR-1750 board. - Paul's __cpuinit/__cpuinitdata cleanups. - New Malta CPU board support large memory so enable ZONE_DMA32. * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (131 commits) MIPS: spinlock: Adjust arch_spin_lock back-off time MIPS: asmmacro: Ensure 64-bit FP registers are used with MSA MIPS: BCM47xx: Simplify handling SPROM revisions MIPS: Cobalt Don't use module_init in non-modular MTD registration. MIPS: BCM47xx: Move NVRAM driver to the drivers/firmware/ MIPS: use for_each_sg() MIPS: BCM47xx: Don't select BCMA_HOST_PCI MIPS: BCM47xx: Add helper variable for storing NVRAM length MIPS: IRQ/IP27: Move IRQ allocation API to platform code. MIPS: Replace smp_mb with release barrier function in unlocks. MIPS: i8259: DT support MIPS: Malta: Basic DT plumbing MIPS: include errno.h for ENODEV in mips-cm.h MIPS: Define GCR_GIC_STATUS register fields MIPS: BPF: Introduce BPF ASM helpers MIPS: BPF: Use BPF register names to describe the ABI MIPS: BPF: Move register definition to the BPF header MIPS: net: BPF: Replace RSIZE with SZREG MIPS: BPF: Free up some callee-saved registers MIPS: Xtalk: Update xwidget.h with known Xtalk device numbers ...
2015-06-26Merge tag 'tty-4.2-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty Pull tty/serial driver updates from Greg KH: "Here's the tty and serial driver patches for 4.2-rc1. A number of individual driver updates, some code cleanups, and other minor things, full details in the shortlog. All have been in linux-next for a while with no reported issues" * tag 'tty-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (152 commits) Doc: serial-rs485.txt: update RS485 driver interface Doc: tty.txt: remove mention of the BKL MAINTAINERS: tty: add serial docs directory serial: sprd: check for NULL after calling devm_clk_get serial: 8250_pci: Correct uartclk for xr17v35x expansion chips serial: 8250_pci: Add support for 12 port Exar boards serial: 8250_uniphier: add bindings document for UniPhier UART serial: core: cleanup in uart_get_baud_rate() serial: stm32-usart: Add STM32 USART Driver tty/serial: kill off set_irq_flags usage tty: move linux/gsmmux.h to uapi doc: dt: add documentation for nxp,lpc1850-uart serial: 8250: add LPC18xx/43xx UART driver serial: 8250_uniphier: add UniPhier serial driver serial: 8250_dw: support ACPI platforms with integrated DMA engine serial: of_serial: check the return value of clk_prepare_enable() serial: of_serial: use devm_clk_get() instead of clk_get() serial: earlycon: Add support for big-endian MMIO accesses serial: sirf: use hrtimer for data rx serial: sirf: correct the fifo empty_bit ...
2015-06-25Merge tag 'for-4.2' of git://git.sourceforge.jp/gitroot/uclinux-h8/linuxLinus Torvalds
Pull Renesas H8/300 architecture re-introduction from Yoshinori Sato. We dropped arch/h8300 two years ago as stale and old, this is a new and more modern rewritten arch support for the same architecture. * tag 'for-4.2' of git://git.sourceforge.jp/gitroot/uclinux-h8/linux: (27 commits) h8300: fix typo. h8300: Always build dtb h8300: Remove ARCH_WANT_IPC_PARSE_VERSION sh-sci: Get register size from platform device clk: h8300: fix error handling in h8s2678_pll_clk_setup() h8300: Symbol name fix h8300: devicetree source h8300: configs h8300: IRQ chip driver h8300: clocksource h8300: clock driver h8300: Build scripts h8300: library functions h8300: Memory management h8300: miscellaneous functions h8300: process helpers h8300: compressed image support h8300: Low level entry h8300: kernel startup h8300: Interrupt and exceptions ...
2015-06-23Merge tag 'gpio-v4.2-1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio Pull gpio updates from Linus Walleij: "This is the big bulk of GPIO changes queued for the v4.2 kernel series: - a big set of cleanups to the aged sysfs interface from Johan Hovold. To get these in, v4.1-rc3 was merged into the tree as the first patch in that series had to go into stable. This makes the locking much more fine-grained (get rid of the "big GPIO lock(s)" and store states in the GPIO descriptors. - rename gpiod_[g|s]et_array() to gpiod_[g|s]et_array_value() to avoid confusions. - New drivers for: * NXP LPC18xx (currently LPC1850) * NetLogic XLP * Broadcom STB SoC's * Axis ETRAXFS * Zynq Ultrascale+ (subdriver) - ACPI: * make it possible to retrieve GpioInt resources from a GPIO device using acpi_dev_gpio_irq_get() * merge some dependent I2C changes exploiting this. * support the ARM X-Gene GPIO standby driver. - make it possible for the generic GPIO driver to read back the value set registers to reflect current status. - loads of OMAP IRQ handling fixes. - incremental improvements to Kona, max732x, OMAP, MXC, RCAR, PCA953x, STP-XWAY, PCF857x, Crystalcove, TB10x. - janitorial (constification, checkpatch cleanups)" * tag 'gpio-v4.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (71 commits) gpio: Fix checkpatch.pl issues gpio: pcf857x: handle only enabled irqs gpio / ACPI: Return -EPROBE_DEFER if the gpiochip was not found GPIO / ACPI: export acpi_gpiochip_request(free)_interrupts for module use gpio: improve error reporting on own descriptors gpio: promote own request failure to pr_err() gpio: Added support to Zynq Ultrascale+ MPSoC gpio: add ETRAXFS GPIO driver fix documentation after renaming gpiod_set_array to gpiod_set_array_value gpio: Add GPIO support for Broadcom STB SoCs gpio: xgene: add ACPI support for APM X-Gene GPIO standby driver gpio: tb10x: Drop unneeded free_irq() call gpio: crystalcove: set IRQCHIP_SKIP_SET_WAKE for the irqchip gpio: stp-xway: Use the of_property_read_u32 helper gpio: pcf857x: Check for irq_set_irq_wake() failures gpio-stp-xway: Fix enabling the highest bit of the PHY LEDs gpio: Prevent an integer overflow in the pca953x driver gpio: omap: rework omap_gpio_irq_startup to handle current pin state properly gpio: omap: rework omap_gpio_request to touch only gpio specific registers gpio: omap: rework omap_x_irq_shutdown to touch only irqs specific registers ...
2015-06-23sh-sci: Get register size from platform deviceYoshinori Sato
There is much SCI of SoC having within, and the register size is also different in everyone. So get from platform device. Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp> Acked-by: by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
2015-06-23sh-sci: Add h8300 SCIYoshinori Sato
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp> Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
2015-06-21serial: 8250_ingenic: support for Ingenic SoC UARTsPaul Burton
Introduce a driver suitable for use with the UARTs present in Ingenic SoCs such as the JZ4740 & JZ4780. These are described as being ns16550 compatible but aren't quite - they require the setting of an extra bit in the FCR register to enable the UART module. The serial_out implementation is the same as that in arch/mips/jz4740/serial.c - which will shortly be removed. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jiri Slaby <jslaby@suse.cz> Cc: Lars-Peter Clausen <lars@metafoo.de> Cc: linux-serial@vger.kernel.org Cc: linux-mips@linux-mips.org Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Peter Hurley <peter@hurleysoftware.com> Cc: Alan Cox <alan@linux.intel.com> Cc: linux-kernel@vger.kernel.org Cc: Matthias Brugger <matthias.bgg@gmail.com> Cc: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> Cc: Tony Lindgren <tony@atomide.com> Cc: John Crispin <blogic@openwrt.org> Patchwork: https://patchwork.linux-mips.org/patch/10159/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-06-12serial: sprd: check for NULL after calling devm_clk_getFernando Guzman Lugo
In platforms which does not use CLK framework (HAVE_CLK not set), the clk_* functions return NULL instead of an error. This patch handles that scenario. Signed-off-by: Fernando Guzman Lugo <fernando.guzman.lugo@intel.com> Signed-off-by: Chunyan Zhang <chunyan.zhang@spreadtrum.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-12serial: 8250_pci: Correct uartclk for xr17v35x expansion chipsSoeren Grunewald
The internal clock of the master chip, which is usually 125MHz, is only half (62.5MHz) for the slave chips. So we have to adjust the uartclk for all the slave ports. Therefor we add a new function to determine if a slave chip is present and update pci_xr17v35x_setup accordingly. Signed-off-by: Soeren Grunewald <soeren.grunewald@desy.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-12serial: 8250_pci: Add support for 12 port Exar boardsSoeren Grunewald
The Exar XR17V358 can also be combined with a XR17V354 chip to act as a single 12 port chip. This works the same way as the combining two XR17V358 chips. But the reported device id then is 0x4358. Signed-off-by: Soeren Grunewald <soeren.grunewald@desy.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-12serial: core: cleanup in uart_get_baud_rate()Joakim Nordell
Align with coding guidelines: Replaced a chain of "else if" by a switch case. Signed-off-by: Joakim Nordell <joakim.nordell@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-10serial: stm32-usart: Add STM32 USART DriverMaxime Coquelin
This drivers adds support to the STM32 USART controller, which is a standard serial driver. Tested-by: Chanwoo Choi <cw00.choi@samsung.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Reviewed-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Maxime Coquelin <mcoquelin.stm32@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-09serial: 8250_omap: Move wake-up interrupt to generic wakeirqTony Lindgren
We can now use generic wakeirq handling and remove the custom handling for the wake-up interrupts. Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Tony Lindgren <tony@atomide.com>
2015-06-09serial: omap: Switch wake-up interrupt to generic wakeirqTony Lindgren
We can now use generic wakeirq handling and remove the custom handling for the wake-up interrupts. Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Tony Lindgren <tony@atomide.com>
2015-06-09tty/serial: kill off set_irq_flags usageRob Herring
set_irq_flags is ARM specific with custom flags which have genirq equivalents. Convert drivers to use the genirq interfaces directly, so we can kill off set_irq_flags. The translation of flags is as follows: IRQF_VALID -> !IRQ_NOREQUEST IRQF_PROBE -> !IRQ_NOPROBE IRQF_NOAUTOEN -> IRQ_NOAUTOEN For IRQs managed by an irqdomain, the irqdomain core code handles clearing and setting IRQ_NOREQUEST already, so there is no need to do this in .map() functions and we can simply remove the set_irq_flags calls. Some users also set IRQ_NOPROBE and this has been maintained although it is not clear that is really needed. There appears to be a great deal of blind copy and paste of this code. Signed-off-by: Rob Herring <robh@kernel.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jiri Slaby <jslaby@suse.cz> Cc: Barry Song <baohua@kernel.org> Cc: linux-serial@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-08Merge 4.1-rc7 into tty-nextGreg Kroah-Hartman
This fixes up a merge issue with the amba-pl011.c driver, and we want the fixes in this branch as well. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-01gpiolib: rename gpiod_set_array to gpiod_set_array_valueRojhalat Ibrahim
There have been concerns that the function names gpiod_set_array() and gpiod_get_array() might be confusing to users. One might expect gpiod_get_array() to return array values, while it is actually the array counterpart of gpiod_get(). To be consistent with the single descriptor API we could rename gpiod_set_array() to gpiod_set_array_value(). This makes some function names a bit lengthy: gpiod_set_raw_array_value_cansleep(). Signed-off-by: Rojhalat Ibrahim <imr@rtschenk.de> Acked-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2015-06-01serial: 8250_omap: provide complete custom startup & shutdown callbacksSebastian Andrzej Siewior
The currently in-use port->startup and port->shutdown are "okay". The startup part for instance does the tiny omap extra part and invokes serial8250_do_startup() for the remaining pieces. The workflow in serial8250_do_startup() is okay except for the part where UART_RX is read without a check if there is something to read. I tried to workaround it in commit 0aa525d11859 ("tty: serial: 8250_core: read only RX if there is something in the FIFO") but then reverted it later in commit ca8bb4aefb9 ("serial: 8250: Revert "tty: serial: 8250_core: read only RX if there is something in the FIFO""). This is the second attempt to get it to work on older OMAPs without breaking other chips this time Peter Hurley suggested to pull in the few needed lines from serial8250_do_startup() and drop everything else that is not required including making it simpler like using just request_irq() instead the chain handler like it is doing now. So lets try that. Fixes: ca8bb4aefb93 ("serial: 8250: Revert "tty: serial: 8250_core: read only RX if there is something in the FIFO"") Tested-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-01serial: 8250: add LPC18xx/43xx UART driverJoachim Eastwood
Serial port driver for the 8250-based UART found on LPC18xx/43xx devices. The UART is 16550A compatible with additional features like RS485 support, synchronous mode, IrDA, and DMA. For now only basic UART and RS485 operation is supported. Signed-off-by: Joachim Eastwood <manabian@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-01serial: 8250_uniphier: add UniPhier serial driverMasahiro Yamada
Add the driver for on-chip UART used on UniPhier SoCs. This hardware is similar to 8250, but the register mapping is slightly different: - The offset to FCR, MCR is different. - The divisor latch access bit does not exist. Instead, the divisor latch register is available at offset 9. This driver overrides serial_{in,out}, dl_{read,write} callbacks, but wants to borrow most of code from 8250_core.c. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-01serial: 8250_dw: support ACPI platforms with integrated DMA engineHeikki Krogerus
On many new Intel SoCs the UART has an integrated DMA engine (iDMA). In order to use it a special filter function is needed. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-01serial: of_serial: check the return value of clk_prepare_enable()Masahiro Yamada
The function clk_prepare_enable() may fail, and in that case it does not make sense to proceed. Let's check its return code and error out if it is a negative value. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-01serial: of_serial: use devm_clk_get() instead of clk_get()Masahiro Yamada
The probe method of this driver calls clk_get(), but clk_put() is missing from the remove callback. Using the managed clk function is easier than fixing other parts. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-01serial: earlycon: Add support for big-endian MMIO accessesNoam Camus
Support command line parameters of the form: earlycon=<name>,io|mmio|mmio32|mmio32be,<addr>,<options> This commit seem to be needed even after commit: serial: 8250: Add support for big-endian MMIO accesses c627f2ceb692e8a9358b64ac2d139314e7bb0d17 Signed-off-by: Noam Camus <noamc@ezchip.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-01serial: sirf: use hrtimer for data rxQipan Li
when the serial works as a bluetooth sink, due to audio realtime requirement, the driver should have something similar with ALSA: 1. one big DMA buffer to easy the schedule jitter 2. split this big DMA buffer to multiple small periods, for each period, we get a DMA interrupt, then push the data to userspace. the small periods will easy the audio latency. so ALSA generally uses a cyclic chained DMA. but for sirfsoc, the dma hardware has the limitation: we have only two loops in the cyclic mode, so we can only support two small periods to switch. if we make the DMA buffer too big, we get long latency, if we make the DMA buffer too little, we get miss in scheduling for audio realtime. so this patch moves to use a hrtimer to simulate the cyclic DMA, then we can have a big buffer, and also have a timely data push to users as the hrtimer can generate in small period then actual HW interrupts. with this patch, we also delete a lot of complex codes to handle loop buffers, and RX timeout interrupt since the RX work can be completely handled from hrtimer interrupt. tests show using this way will make our bad audio streaming be- come smooth. Signed-off-by: Qipan Li <Qipan.Li@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-01serial: sirf: correct the fifo empty_bitQipan Li
Signed-off-by: Qipan Li <Qipan.Li@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-01serial: sirf: fix system hung on console log outputQipan Li
A corner case exists in the current driver. if an app opens the console device, and before writing to console device, and there are huge kernel ogs to print out, system will hang on sirfsoc_uart_console_putchar: while (rd_regl(port, ureg->sirfsoc_tx_fifo_status) & ufifo_st->ff_full(port->line)) cpu_relax(); as in sirfsoc_uart_startup(), the driver assigns tx_fifo_op to 0 will stop TX FIFO, this loop will be endless. Signed-off-by: Qipan Li <Qipan.Li@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-01serial: 8250: remove return statements from void functionMasahiro Yamada
serial8250_set_mctrl() is a void type function. Returning something does not look nice. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-01sc16is7xx: use kworker for RS-485 configurationJakub Kicinski
RS-485 configuration is also done under the spinlock so no blocking I/O allowed. Signed-off-by: Jakub Kicinski <kubakici@wp.pl> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-01sc16is7xx: use kworker to update ier bitsJakub Kicinski
.stop_rx/tx() are called in atomic context, we cannot use blocking I/O. While at it correct the name of RX bit and '*' placement in pointer declarations. Signed-off-by: Jakub Kicinski <kubakici@wp.pl> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-01sc16is7xx: use kworker for md_procJakub Kicinski
Convert md_proc into general async reconfiguration procedure. Signed-off-by: Jakub Kicinski <kubakici@wp.pl> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-01sc16is7xx: move RTS delay to workqueueJakub Kicinski
Instead of spinning under port->lock let's just sleep inside the kthread. It should be equivalent as TX cannot proceed when thread is blocked. Signed-off-by: Jakub Kicinski <kubakici@wp.pl> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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