- 12 1月, 2017 2 次提交
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由 David Lechner 提交于
This adds a new UART port type for TI DA8xx/OMAPL13x/AM17xx/AM18xx/66AK2x. These SoCs have standard 8250 registers plus some extra non-standard registers. The UART will not function unless the non-standard Power and Emulation Management Register (PWREMU_MGMT) is configured correctly. This is currently handled in arch/arm/mach-davinci/serial.c for non-device-tree boards. Making this part of the UART driver will allow UART to work on device-tree boards as well and the mach code can eventually be removed. Signed-off-by: NDavid Lechner <david@lechnology.com> Acked-by: NSekhar Nori <nsekhar@ti.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Alexey Brodkin 提交于
With CONFIG_DYNAMIC_DEBUG if dyndbg enables debug output in 8250_port.c deadlock happens inevitably on UART IRQ handling. That's the problematic execution path: ---------------------------->8------------------------ UART IRQ: serial8250_interrupt() -> serial8250_handle_irq(): lock "port->lock" -> pr_debug() -> serial8250_console_write(): bump in locked "port->lock". OR (if above pr_debug() gets removed): serial8250_tx_chars() -> pr_debug() -> serial8250_console_write(): bump in locked "port->lock". ---------------------------->8------------------------ So let's get rid of those not that much useful debug entries. Discussed problem could be easily reproduced with QEMU for x86_64. As well as this fix could be mimicked with muting of dynamic debug for the problematic lines as simple as: ---------------------------->8------------------------ dyndbg="+p; file 8250_port.c line 1756 -p; file 8250_port.c line 1822 -p" ---------------------------->8------------------------ Signed-off-by: NAlexey Brodkin <abrodkin@synopsys.com> Cc: Jiri Slaby <jslaby@suse.com> Cc: Peter Hurley <peter@hurleysoftware.com> Cc: Phillip Raffeck <phillip.raffeck@fau.de> Cc: Anton Wuerfel <anton.wuerfel@fau.de> Cc: "Matwey V. Kornilov" <matwey@sai.msu.ru> Cc: Yegor Yefremov <yegorslists@googlemail.com> Cc: Thor Thayer <tthayer@opensource.altera.com> Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 16 11月, 2016 2 次提交
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由 Ed Blake 提交于
Expose set_ldisc() function so that it can be overridden with a platform specific implementation. Signed-off-by: NEd Blake <ed.blake@imgtec.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Andy Shevchenko 提交于
The following fix of runtime PM use in DMA mode requires at least serial8250_rpm_put_tx() to be available. Export both calls. Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 27 10月, 2016 1 次提交
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由 Steve Shih 提交于
NXP SC16C2552 requires that we always write a reset to the RX FIFO and TX FIFO whenever we enable the FIFOs Cc: xe-kernel@external.cisco.com Signed-off-by: NSteve Shih <sshih@cisco.com> Signed-off-by: NDavid Singleton <davsingl@cisco.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 27 9月, 2016 1 次提交
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由 Thor Thayer 提交于
The Altera 16550 soft IP UART requires 2 additional registers for TX FIFO threshold support. These 2 registers enable the TX FIFO Low Watermark and set the TX FIFO Low Watermark. Set the TX FIFO threshold to the FIFO size - tx_loadsz. Signed-off-by: NThor Thayer <tthayer@opensource.altera.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 22 9月, 2016 1 次提交
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由 Jiri Olsa 提交于
First loop in wait_for_xmitr could also trigger NMI watchdog in case reading from the port is slow: PID: 0 TASK: ffffffff819c1460 CPU: 0 COMMAND: "swapper/0" #0 [ffff88019f405e58] crash_nmi_callback at ffffffff8104d382 #1 [ffff88019f405e68] nmi_handle at ffffffff8168ead9 #2 [ffff88019f405eb0] do_nmi at ffffffff8168ec53 #3 [ffff88019f405ef0] end_repeat_nmi at ffffffff8168df13 [exception RIP: delay_tsc+50] RIP: ffffffff81325642 RSP: ffff88019f403bb0 RFLAGS: 00000083 RAX: 00000000000005c8 RBX: ffffffff81f83000 RCX: 0000024e4fb88a8b RDX: 0000024e4fb89053 RSI: 0000000000000000 RDI: 00000000000007d1 RBP: ffff88019f403bb0 R8: 000000000000000a R9: 0000000000000000 R10: 0000000000000000 R11: ffff88019f403ad6 R12: 000000000000250f R13: 0000000000000020 R14: ffffffff81d360c7 R15: 0000000000000047 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 --- <NMI exception stack> --- #4 [ffff88019f403bb0] delay_tsc at ffffffff81325642 #5 [ffff88019f403bb8] __const_udelay at ffffffff813255a8 #6 [ffff88019f403bc8] wait_for_xmitr at ffffffff81404390 #7 [ffff88019f403bf0] serial8250_console_putchar at ffffffff8140455c #8 [ffff88019f403c10] uart_console_write at ffffffff813ff00a #9 [ffff88019f403c40] serial8250_console_write at ffffffff814044ae #10 [ffff88019f403c88] call_console_drivers.constprop.15 at ffffffff81086b01 #11 [ffff88019f403cb0] console_unlock at ffffffff8108842f #12 [ffff88019f403ce8] vprintk_emit at ffffffff81088834 #13 [ffff88019f403d58] vprintk_default at ffffffff81088ba9 #14 [ffff88019f403d68] printk at ffffffff8167f034 Adding touch_nmi_watchdog call to the first loop as well. Reported-by: NChunyu Hu <chuhu@redhat.com> Signed-off-by: NJiri Olsa <jolsa@kernel.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 02 9月, 2016 2 次提交
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由 Andy Shevchenko 提交于
Unify the check of em485 variable to be either (em485) or (!em485) instead of the explicit comparison to NULL. While here, remove redundant check in __do_stop_tx_rs485() and __stop_tx_rs485() since the functions ain't called with NULL value of em485 variable. Cc: "Matwey V. Kornilov" <matwey@sai.msu.ru> Tested-by: NYegor Yefremov <yegorslists@googlemail.com> Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Andy Shevchenko 提交于
There are calls to serial8250_rpm_{get|put}() in __do_stop_tx_rs485() that are certainly placed in a wrong location. I dunno how it had been tested with runtime PM enabled because it is obvious "sleep in atomic context" error. Besides that serial8250_rpm_get() is called immediately after an IO just happened. It implies that the device is already powered on, see implementation of serial8250_em485_rts_after_send() and serial8250_clear_fifos() for the details. There is no bug have been seen due to, as I can guess, use of auto suspend mode when scheduled transaction to suspend is invoked quite lately than it's needed for a few writes to the port. It might be possible to trigger a warning if stop_tx_timer fires when device is suspended. Refactor the code to use runtime PM only in case of timer function. Fixes: 0c66940d ("tty/serial/8250: fix RS485 half-duplex RX") Cc: "Matwey V. Kornilov" <matwey@sai.msu.ru> Tested-by: NYegor Yefremov <yegorslists@googlemail.com> Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 31 8月, 2016 3 次提交
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由 Andy Shevchenko 提交于
Intel Quark has 16550A compatible UART with autoflow feature enabled. It has only 16 bytes of FIFO. Currently serial8250_do_set_termios() prevents to enable autoflow since the minimum requirement of 32 bytes of FIFO size. Drop a FIFO size limitation to allow autoflow control be enabled on such UARTs. While here, comment out UART_CAP_AFE for PORT_AR7 since it wasn't working and it will be not a good idea to use it in conjunction with trigger level of 1 byte. Suggested-by: NPeter Hurley <peter@hurleysoftware.com> Reviewed-by: NPeter Hurley <peter@hurleysoftware.com> Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: NBryan O'Donoghue <pure.logic@nexus-software.ie> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Eddie Huang 提交于
mediatek can support baud rate up to 4M. the 'uart_get_baud_rate' function will limit the max baud rate. Modify max baud to remove the limit. Signed-off-by: NLong Cheng <long.cheng@mediatek.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Andy Shevchenko 提交于
Serial console is broken in v4.8-rcX. Mika and I independently bisected down to commit 4ef03d32 ("tty/serial/8250: use mctrl_gpio helpers"). Since neither author nor anyone else didn't propose a solution we better revert it for now. This reverts commit 4ef03d32. Link: https://lkml.kernel.org/r/20160809130229.GN1729@lahna.fi.intel.comSigned-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: NHeikki Krogerus <heikki.krogerus@linux.intel.com> Tested-by: NMika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 26 6月, 2016 3 次提交
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由 Yegor Yefremov 提交于
This patch permits the usage for GPIOs to control the CTS/RTS/DTR/DSR/DCD/RI signals. Signed-off-by: NYegor Yefremov <yegorslists@googlemail.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Yegor Yefremov 提交于
Introduce serial8250_out_MCR() and serial8250_in_MCR() routines, that replace following calls: serial_out(port, UART_MCR, val) serial_port_out(up, UART_MCR, val) serial_in(port, UART_MCR) This patch is needed in order to integrate reading/writing of MCR signals via SERIAL_MCTRL_GPIO infrastructure later. Reviewed-by: NPeter Hurley <peter@hurleysoftware.com> Signed-off-by: NYegor Yefremov <yegorslists@googlemail.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Jiri Slaby 提交于
The compiler complains about variables that are set, but never used: * intX variables in exar_handle_irq drivers/tty/serial/8250/8250_port.c:1864:34: warning: variable ‘int3’ set but not used [-Wunused-but-set-variable] * val variable in pci_quatech_wqopr drivers/tty/serial/8250/8250_pci.c:1139:10: warning: variable ‘val’ set but not used [-Wunused-but-set-variable] And about a shadow variable: * tmout in wait_for_xmitr is defined twice with the same type. Both of them are also initialized before use. Remove all of them. Signed-off-by: NJiri Slaby <jslaby@suse.cz> Cc: Matt Schulte <matts@commtech-fastcom.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 25 6月, 2016 1 次提交
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由 Jiri Slaby 提交于
Convert DEBUG_INTR to pr_debug: * defined semantics (DEBUG, DYNAMIC_DEBUG) * KERN_DEBUG level instead of KERN_DEFAULT * emit __func__ and \n * verified 'fmt' even when !DEBUG I wonder if anybody ever used that or whether we should just drop the lines. Signed-off-by: NJiri Slaby <jslaby@suse.cz> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 01 5月, 2016 5 次提交
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由 Ricardo Ribalda Delgado 提交于
The 8250_fintek driver advertises as the PNP0501 driver; however this conflicts with the standard 16550A uart PNP0501. The conflict causes the 8250_fintek driver to load with _every_ PNP0501, but never probe, and causing the entire 8250 driver stack to unload if the 8250_fintek driver is unloaded (modprobe doesn't know that 8250_pnp rather than 8250_fintek claimed the resource). This patch merges the Fintek driver into 8250_base. On autoconfig_16550 the device is probed to verify if it is a FINTEK device or not. This custom probing can be disabled completely via configuration. When a Fintek device is not probed it will behave as a standard 16550A device, with no RS485 capabilities. Reported-by: NPeter Hurley <peter@hurleysoftware.com> Signed-off-by: NRicardo Ribalda Delgado <ricardo.ribalda@gmail.com> Reviewed-by: NPeter Hurley <peter@hurleysoftware.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Peter Hurley 提交于
Using fake IIR values to perform rx dma operations unnecessarily conflates separate operations, stopping in-progress dma with starting new dma. Introduce serial8250_rx_dma_flush() to handle stopping in-progress dma [omap8250 already has equivalent omap_8250_rx_dma_flush()]. Replace rx_dma(UART_IIR_RX_TIMEOUT) with the equivalent *_rx_dma_flush(), and rx_dma(0) with the equivalent *_rx_dma(). Handle IIR steering in the irq handler with handle_rx_dma() helper. Signed-off-by: NPeter Hurley <peter@hurleysoftware.com> Reviewed-by: NHeikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Peter Hurley 提交于
If !up->dma == F, then up->dma == T and can be elided from the (up->dma && up->dma->tx_err) sub-expression. Signed-off-by: NPeter Hurley <peter@hurleysoftware.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Peter Hurley 提交于
dma_err is not used other than for boolean evaluation; substitute the actual operation directly. Signed-off-by: NPeter Hurley <peter@hurleysoftware.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Wan Ahmad Zainie 提交于
Exposes get_mctrl() function so that it can be overriden with platform specific implementation. Signed-off-by: NWan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@intel.com> Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: NHeikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 19 4月, 2016 1 次提交
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由 Yegor Yefremov 提交于
When in half-duplex mode RX will be disabled before TX, but not enabled after deactivating transmitter. This patch enables UART_IER_RLSI and UART_IER_RDI interrupts after TX is over. Cc: Matwey V. Kornilov <matwey@sai.msu.ru> Signed-off-by: NYegor Yefremov <yegorslists@googlemail.com> Fixes: e490c914 ("tty: Add software emulated RS485 support for 8250") Acked-by: NMatwey V. Kornilov <matwey@sai.msu.ru> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 08 3月, 2016 2 次提交
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由 Andy Shevchenko 提交于
up_to_u8250p() casts struct uart_port * to struct uart_8250_port *. Update code to use it instead of open coded variant. Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Matwey V. Kornilov 提交于
serial8250_em485_init() is supposed to be protected with p->port.lock spinlock. This may lead to issues when kmalloc sleeps, so it is better to use GFP_ATOMIC in this spinlocked context. Fixes: e490c914 ("tty: Add software emulated RS485 support for 8250") Reported-by: NИльяс Гасанов <torso.nafi@gmail.com> Signed-off-by: NMatwey V. Kornilov <matwey@sai.msu.ru> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 07 2月, 2016 8 次提交
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由 Anton Wuerfel 提交于
Checkpatch complains about incorrect indentation of switch/case statements. This patch fixes the corresponding warnings. Additionally some indentation is changed to match the correct format specified in the Linux Kernel Coding Style. Signed-off-by: NAnton Würfel <anton.wuerfel@fau.de> Signed-off-by: NPhillip Raffeck <phillip.raffeck@fau.de> Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: linux-kernel@i4.cs.fau.de Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Phillip Raffeck 提交于
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: NPhillip Raffeck <phillip.raffeck@fau.de> Signed-off-by: NAnton Würfel <anton.wuerfel@fau.de> Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: linux-kernel@i4.cs.fau.de Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Anton Wuerfel 提交于
Checkpatch outputs some warnings about incorrect comment style, which is fixed by this patch. Signed-off-by: NAnton Würfel <anton.wuerfel@fau.de> Signed-off-by: NPhillip Raffeck <phillip.raffeck@fau.de> Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: linux-kernel@i4.cs.fau.de Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Anton Wuerfel 提交于
Indentation is changed to match the correct format of using tabs instead of spaces wherever possible. Signed-off-by: NAnton Würfel <anton.wuerfel@fau.de> Signed-off-by: NPhillip Raffeck <phillip.raffeck@fau.de> Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: NPeter Hurley <peter@hurleysoftware.com> Cc: linux-kernel@i4.cs.fau.de Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Anton Wuerfel 提交于
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: NAnton Würfel <anton.wuerfel@fau.de> Signed-off-by: NPhillip Raffeck <phillip.raffeck@fau.de> Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: linux-kernel@i4.cs.fau.de Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Sebastian Frias 提交于
Some UART HW has a single register combining UART_DLL/UART_DLM (this was probably forgotten in the change that introduced the callbacks, commit b32b19b8) Fixes: b32b19b8 ("[SERIAL] 8250: set divisor register correctly ...") Signed-off-by: NSebastian Frias <sf84@laposte.net> Reviewed-by: NPeter Hurley <peter@hurleysoftware.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Matwey V. Kornilov 提交于
Implementation of software emulation of RS485 direction handling is based on omap_serial driver. Before and after transmission RTS is set to the appropriate value. Note that before calling serial8250_em485_init() the caller has to ensure that UART will interrupt when shift register empty. Otherwise, emultaion cannot be used. Both serial8250_em485_init() and serial8250_em485_destroy() are idempotent functions. Signed-off-by: NMatwey V. Kornilov <matwey@sai.msu.ru> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Matwey V. Kornilov 提交于
Software RS485 emultaion is to be added in the following commit. serial8250_start_tx() will need to refer serial8250_stop_rx(). Move serial8250_stop_rx() in front of serial8250_start_tx() in order to avoid function forward declaration. Signed-off-by: NMatwey V. Kornilov <matwey@sai.msu.ru> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 29 1月, 2016 5 次提交
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由 Peter Hurley 提交于
Signed-off-by: NPeter Hurley <peter@hurleysoftware.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Peter Hurley 提交于
After masking all interrupts, wait for the irq handler to complete before continuing shutdown. Signed-off-by: NPeter Hurley <peter@hurleysoftware.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Peter Hurley 提交于
The defunct low_latency input steering executed flush_to_ldisc() directly from interrupt context so dropping the port lock was necessary to avoid deadlock. That steering was removed by commit a9c3f68f Author: Peter Hurley <peter@hurleysoftware.com> Date: Sat Feb 22 07:31:21 2014 -0500 tty: Fix low_latency BUG Signed-off-by: NPeter Hurley <peter@hurleysoftware.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Peter Hurley 提交于
When max_count is reached, the rx loop exits. However, UART_LSR has already been read so those char flags are lost, and subsequent rx status will be for the wrong byte until the rx fifo drains. Reported-by: NGeorge Spelvin <linux@horizon.com> Signed-off-by: NPeter Hurley <peter@hurleysoftware.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Peter Hurley 提交于
Factor the read/process one char inner loop to a separate helper function serial8250_read_char(). No functional change. Signed-off-by: NPeter Hurley <peter@hurleysoftware.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 14 12月, 2015 1 次提交
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由 Masahiro Yamada 提交于
Currently, 8-bit (MMIO) and 32-bit (MMIO32) register interfaces are supported for the 8250 console, but the 16-bit (MMIO16) is not. The 8250 UART device on my board is connected to a 16-bit bus and my main motivation is to use earlycon with it. (Refer to arch/arm/boot/dts/uniphier-support-card.dtsi) Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: NPeter Hurley <peter@hurleysoftware.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 05 10月, 2015 2 次提交
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由 Mans Rullgard 提交于
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: NMans Rullgard <mans@mansr.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Peter Hurley 提交于
Move h/w reinit of serial console restore-from-suspend into standalone helper function. No functional change. Signed-off-by: NPeter Hurley <peter@hurleysoftware.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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