kernel/linux.git/drivers/tty/serial/samsung.h, branch linux-4.4.y

serial: samsung: fix DMA mode enter condition for small FIFO sizes

2015-08-05T05:07:23+00:00

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. Cc: # v3.18+ Reported-by: Krzysztof Kozlowski Signed-off-by: Marek Szyprowski Signed-off-by: Robert Baldyga Signed-off-by: Greg Kroah-Hartman

serial: samsung: add DMA support for RX

2015-01-09T22:25:39+00:00

Add RX DMA transfers support for samsung serial driver. It's enabled when DMA controller for RX channel is specified in device-tree. DMA transactions are started when number of bytes in RX FIFO reaches trigger level, otherwise PIO mode is used. DMA transfer size is always PAGE_SIZE which can cause large latency when smaller data amount is transferred, so we always terminate DMA transaction on RX timeout interrupt. Timeout interval is set to 64 frame times. Based on previous work of Sylwester Nawrocki and Lukasz Czerwinski. Signed-off-by: Robert Baldyga Signed-off-by: Greg Kroah-Hartman

serial: samsung: add DMA support for TX

2015-01-09T22:25:39+00:00

Add TX DMA transfers support for samsung serial driver. It's enabled when "dmas" property is defined in serial device-tree node, otherwise TX transfers are prerformed using PIO. TX DMA is used for data segments larger than fifosize to reduce number of interrupts during data transmission. For buffers shorter than fifosize PIO mode is selected. Data blocks for DMA transfers are aligned to cache line size to avoid problems with coherency (some areas of TX circ buffer can be used by CPU during DMA transaction, so we have to ensure that our data is always consistent). Based on previous work of Sylwester Nawrocki and Lukasz Czerwinski. Signed-off-by: Robert Baldyga Signed-off-by: Greg Kroah-Hartman

serial: samsung: add struct s3c24xx_uart_dma

2015-01-09T22:25:39+00:00

This struct contains DMA configuration for each serial port. It will be used in next commits adding DMA support in driver. Based on previous work of Sylwester Nawrocki and Lukasz Czerwinski. Signed-off-by: Robert Baldyga Signed-off-by: Greg Kroah-Hartman

serial: samsung: Neaten dbg uses

2014-05-28T19:27:22+00:00

Add format and argument checking and fix misuses in the dbg macro. Add __printf Use %pR for resource Add #include guard to samsung.h Move static functions from .h to .c Use vscnprintf instead of length unguarded vsprintf Signed-off-by: Joe Perches Signed-off-by: Greg Kroah-Hartman

serial: samsung: Remove casting the return value which is a void pointer

2013-09-26T21:29:59+00:00

Casting the return value which is a void pointer is redundant. The conversion from void pointer to any other pointer type is guaranteed by the C programming language. Signed-off-by: Jingoo Han Acked-by: Vineet Gupta Signed-off-by: Greg Kroah-Hartman

serial: samsung: fix casting warning

2013-08-12T18:35:31+00:00

port->membase is (unsigned char __iomem *), not (unsigned long *) __set_bit() uses (unsigned long *) as the second argument. Thus, casting (unsigned long *)(unsigned long) is necessary to fix the following sparse warnings. drivers/tty/serial/samsung.c:142:33: warning: cast removes address space of expression drivers/tty/serial/samsung.c:161:33: warning: cast removes address space of expression drivers/tty/serial/samsung.c:176:33: warning: cast removes address space of expression drivers/tty/serial/samsung.c:526:40: warning: cast removes address space of expression Signed-off-by: Jingoo Han Signed-off-by: Greg Kroah-Hartman

tty: serial/samsung: fix modular build

2013-04-11T20:14:37+00:00

There are a few bugs in the samsung serial driver when built as a loadable module, which makes the console code unavailable, as well as giving no access to the 'printascii' early debug function. This adds the appropriate compile time conditionals. Signed-off-by: Arnd Bergmann Signed-off-by: Greg Kroah-Hartman

serial: samsung: merge probe() function from all SoC specific extensions

2011-12-23T01:07:00+00:00

With reset port, set clock and get clock functions in SoC specific extentions being removed, only the driver probe is left over in these extensions. The probe function itself can be merged into one and moved into the samsung common serial driver. With driver probe also moved, all the SoC specific extentions are no longer required and they are deleted. Cc: Ben Dooks Signed-off-by: Thomas Abraham Signed-off-by: Kukjin Kim

serial: samsung: remove all uses of get_clksrc and set_clksrc

2011-12-23T01:06:58+00:00

With clkdev based clock lookup support, the clock set and get operation using clock names communicated between the samsung uart driver and the SoC specific extension can be removed. In addition to that, for each platform specific extension, add the default clock selection, number of clock options for uart baud generator, clock selection bit mask and shift values which is required by the clkdev support in samsung uart driver. The default clock selection value 'def_clk_sel' specifies the default clock to be used as the source clock for baud rate generator in case the platform code does not specify the same. Cc: Ben Dooks Signed-off-by: Thomas Abraham Signed-off-by: Kukjin Kim