- 31 May, 2015 20 commits
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Masahiro Yamada authored
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>
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Heikki Krogerus authored
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:
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Masahiro Yamada authored
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:
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Masahiro Yamada authored
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:
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Noam Camus authored
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 c627f2ceSigned-off-by:
Noam Camus <noamc@ezchip.com> Signed-off-by:
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Qipan Li authored
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:
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Qipan Li authored
Signed-off-by:
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Qipan Li authored
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:
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Masahiro Yamada authored
serial8250_set_mctrl() is a void type function. Returning something does not look nice. Signed-off-by:
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Jakub Kicinski authored
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:
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Jakub Kicinski authored
.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:
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Jakub Kicinski authored
Convert md_proc into general async reconfiguration procedure. Signed-off-by:
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Jakub Kicinski authored
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:
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Jakub Kicinski authored
Convert workqueue usage to a real-time kworker. The problem with workqueues is that we cannot set real-time priorities on our work and asynchronous reconfiguration can be blocked by less important tasks. We need kthread for the interrupt anyway and because we will now be using single kthread for all TX-related operations we can get rid of the port mutex. Signed-off-by:
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Jakub Kicinski authored
LSR_TEMT_BIT (LSR bit 6) provides us exactly the information we need to determine if transmission is finished - FIFO level and shift register empty. We can save ourselves reading FIFO level explicitly if we use this bit. Signed-off-by:
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Jakub Kicinski authored
Without matching bus-specific strings driver will not be loaded automatically. Signed-off-by:
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Jakub Kicinski authored
Users of RS-485 can request via ioctl that RTS signals should be activated selected number of milliseconds before the actual data transmission or delay reception certain number of milli- seconds after the transmission is finished. In sc16is7xx, however, RTS signalling is handled by the hardware and driver has no way of providing this feature. We still try to provide .delay_rts_before_send by delaying transmission but without actual effect on the RTS line. Note: this change will make the driver return -EINVAL when the feature is requested (.delay_rts_after_send is set). Signed-off-by: -
Rama Kiran Kumar Indrakanti authored
Updated the documentation for spi interface. Signed-off-by:
Rama Kiran Kumar Indrakanti <indrakanti_ram@hotmail.com> Signed-off-by:
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Rama Kiran Kumar Indrakanti authored
spi interface for sc16is7xx is added along with Kconfig flag to enable spi or i2c, thus in a instance we can have either spi or i2c or both, in sync to the hw. Signed-off-by:
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Masahiro Yamada authored
The header file, include/linux/serial_8250.h, contains references to UART_LSR_BRK_ERROR_BITS and UART_MSR_ANY_DELTA that are defined in <linux/serial_reg.h>. Signed-off-by:
Peter Hurley <peter@hurleysoftware.com> Signed-off-by:
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- 27 May, 2015 1 commit
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Thierry Reding authored
Commit 27a4c827 ("fbcon: use the cursor blink interval provided by vt") unconditionally removes the cursor blink timer. Unfortunately that wreaks havoc under some circumstances. An easily reproducible way is to use both the framebuffer console and a debug serial port as the console output for kernel messages (e.g. "console=ttyS0 console=tty1" on the kernel command-line. Upon boot this triggers a warning from within the del_timer_sync() function because it is called from IRQ context: [ 5.070096] ------------[ cut here ]------------ [ 5.070110] WARNING: CPU: 0 PID: 0 at ../kernel/time/timer.c:1098 del_timer_sync+0x4c/0x54() [ 5.070115] Modules linked in: [ 5.070120] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.1.0-rc4-next-20150519 #1 [ 5.070123] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [ 5.070142] [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [ 5.070156] [] (show_stack) from [] (dump_stack+0x70/0xbc) [ 5.070164] [] (dump_stack) from [] (warn_slowpath_common+0x74/0xb0) [ 5.070169] [] (warn_slowpath_common) from [] (warn_slowpath_null+0x1c/0x24) [ 5.070174] [] (warn_slowpath_null) from [] (del_timer_sync+0x4c/0x54) [ 5.070183] [] (del_timer_sync) from [] (fbcon_del_cursor_timer+0x2c/0x40) [ 5.070190] [] (fbcon_del_cursor_timer) from [] (fbcon_cursor+0x9c/0x180) [ 5.070198] [] (fbcon_cursor) from [] (hide_cursor+0x30/0x98) [ 5.070204] [] (hide_cursor) from [] (vt_console_print+0x2a8/0x340) [ 5.070212] [] (vt_console_print) from [] (call_console_drivers.constprop.23+0xc8/0xec) [ 5.070218] [] (call_console_drivers.constprop.23) from [] (console_unlock+0x498/0x4f0) [ 5.070223] [] (console_unlock) from [] (vprintk_emit+0x1f0/0x508) [ 5.070228] [] (vprintk_emit) from [] (vprintk_default+0x24/0x2c) [ 5.070234] [] (vprintk_default) from [] (printk+0x70/0x88) After which the system starts spewing all kinds of weird and seemingly unrelated error messages. This commit fixes this by restoring the condition under which the call to fbcon_del_cursor_timer() happens. Reported-by:
Daniel Stone <daniel@fooishbar.org> Reported-by:
Kevin Hilman <khilman@kernel.org> Tested-by:
Kevin Hilman <khilman@linaro.org> Tested-by:
Scot Doyle <lkml14@scotdoyle.com> Signed-off-by:
Thierry Reding <treding@nvidia.com> Tested-by:
Andrew Vagin <avagin@virtuozzo.com> Tested-by:
Tomeu Vizoso <tomeu.vizoso@collabora.com> Signed-off-by:
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- 24 May, 2015 19 commits
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Graeme Gregory authored
Add the necessary driver boilerplate to let the driver be used when the respective ACPI table is discovered by the ACPI subsystem. [Andre: change table name, add MODULE_DEVICE_TABLE entry and improve commit message] Reviewed-by:
Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by:
Graeme Gregory <graeme.gregory@linaro.org> Tested-by:
Mark Langsdorf <mlangsdo@redhat.com> Tested-by:
Naresh Bhat <nbhat@cavium.com> Signed-off-by:
Andre Przywara <andre.przywara@arm.com> Signed-off-by:
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Andre Przywara authored
The ARM Server Base System Architecture[1] document describes a generic UART which is a subset of the PL011 UART. It lacks DMA support, baud rate control and modem status line control, among other things. The idea is to move the UART initialization and setup into the firmware (which does this job today already) and let the kernel just use the UART for sending and receiving characters. We use the recent refactoring to build a new struct uart_ops variable which points to some new functions avoiding access to the missing registers. We reuse as much existing PL011 code as possible. In contrast to the PL011 the SBSA UART does not define any AMBA or PrimeCell relations, so we go with a pretty generic probe function which only uses platform device functions. A DT binding is provided with this patch, ACPI support is added in a separate one. Signed-off-by:
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Andre Przywara authored
The SBSA UART has a fixed baud rate and flow control setting, which cannot be changed or queried by software. Add a vendor specific property to always return fixed values when trying to read the console options. Signed-off-by:
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Andre Przywara authored
The SBSA UART should not be enabled or disabled (it is always on), and consequently the spec lacks the UART_CR register. Add a vendor specific property to skip disabling or enabling of the UART. This will be used later by the SBSA UART support. Signed-off-by:
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Andre Przywara authored
To avoid lines with more than 80 characters and to make the pl011_int() function more readable, move the workaround out into a separate function. Signed-off-by:
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Andre Przywara authored
The PL011 register UART_MIS is actually a bitwise AND of the UART_RIS and the UART_MISC register. Since the SBSA UART does not include the _MIS register, use the two separate registers to get the same behaviour. Since we are inside the spinlock and we read the _IMSC register only once, there should be no race issue. Signed-off-by:
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Andre Przywara authored
Currently the pl011_probe() function is relying on some AMBA IDs and a device tree node to initialize the driver and a port. Both features are not necessarily required for the driver: - we lack AMBA IDs in the ARM SBSA generic UART and - we lack a DT node in ACPI systems. So lets refactor the function to ease later reuse. Signed-off-by:
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Andre Przywara authored
Split the pl011_set_termios() function into smaller chunks to allow easier reuse later when adding SBSA support. Signed-off-by:
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Andre Przywara authored
Split the pl011_shutdown() function into smaller chunks to allow easier reuse later when adding SBSA support. Signed-off-by:
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Andre Przywara authored
Split the pl011_startup() function into smaller chunks to allow easier reuse later when adding SBSA support. Signed-off-by:
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Andre Przywara authored
Although we care about not unregistering the driver if there are still ports connected during the .remove callback, we do miss this check in the pl011_probe function. So if the current port allocation fails, but there are other ports already registered, we will kill those. So factor out the port removal into a separate function and use that in the probe function, too. Signed-off-by:
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Arnd Bergmann authored
If the mediatek serial port driver is built-in, but serial console is disabled in Kconfig (e.g. when the serial driver itself is a loadable module), we get this build error: drivers/built-in.o: In function `early_mtk8250_setup': undefined reference to `early_serial8250_setup' To avoid that problem, this patch encloses the early_mtk8250_setup function in #ifdef CONFIG_SERIAL_8250_CONSOLE, the same symbol that guards the early_serial8250_setup function. Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Acked-by:
Eddie Huang <eddie.huang@mediatek.com> Signed-off-by:
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Arnd Bergmann authored
A configuration that enables earlycon but not the core console code causes a link error: drivers/built-in.o: In function `setup_earlycon': drivers/tty/serial/earlycon.c:70: undefined reference to `uart_parse_earlycon' That error can be triggered by the newly added samsung earlycon support, which is missing a 'select' statement. As suggested by Peter Hurley, solves the problem by moving the 'select SERIAL_EARLYCON' statement to the samsung console driver option, as it is done by all other console drivers. Signed-off-by:
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Arnd Bergmann authored
The platform_sysrq_reset_seq code was intended as a way for an embedded platform to provide its own sysrq sequence at compile time. After over two years, nobody has started using it in an upstream kernel, and the platforms that were interested in it have moved on to devicetree, which can be used to configure the sequence without requiring kernel changes. The method is also incompatible with the way that most architectures build support for multiple platforms into a single kernel. Now the code is producing warnings when built with gcc-5.1: drivers/tty/sysrq.c: In function 'sysrq_init': drivers/tty/sysrq.c:959:33: warning: array subscript is above array bounds [-Warray-bounds] key = platform_sysrq_reset_seq[i]; We could fix this, but it seems unlikely that it will ever be used, so let's just remove the code instead. We still have the option to pass the sequence either in DT, using the kernel command line, or using the /sys/module/sysrq/parameters/reset_seq file. Signed-off-by:
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Uwe Kleine-König authored
The function mctrl_gpio_init returns failure if the assignment to any member of the gpio array results in an error pointer. So there is no need to check for such error values in the other functions. Signed-off-by:
Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by:
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Geert Uytterhoeven authored
Signed-off-by:
Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by:
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Geert Uytterhoeven authored
Add DMA properties to all SCIF, SCIFA, SCIFB, and HSCIF device nodes. Signed-off-by:
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Geert Uytterhoeven authored
Add DMA properties to all SCIF, SCIFA, SCIFB, and HSCIF device nodes. Signed-off-by:
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Geert Uytterhoeven authored
Add DMA properties to all SCIF, SCIFA, SCIFB, and HSCIF device nodes. Signed-off-by:
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