u-boot.git/drivers/serial/serial.c, branch v2023.07.01

post: Move CONFIG_SYS_POST to CFG_SYS_POST

2022-12-23T18:01:13Z

Migrate the rest of the CONFIG_SYS_POST macros over to CFG_SYS_POST namespace. Signed-off-by: Tom Rini

post: Migrate to Kconfig

2022-12-05T21:11:50Z

We move the existing CONFIG_POST_* functionality over to CFG_POST and then introduce CONFIG_POST to Kconfig. Signed-off-by: Tom Rini Reviewed-by: Simon Glass

global: Move remaining CONFIG_SYS_* to CFG_SYS_*

2022-12-05T21:06:08Z

The rest of the unmigrated CONFIG symbols in the CONFIG_SYS namespace do not easily transition to Kconfig. In many cases they likely should come from the device tree instead. Move these out of CONFIG namespace and in to CFG namespace. Signed-off-by: Tom Rini Reviewed-by: Simon Glass

serial: Add semihosting driver

2022-04-01T19:03:13Z

This adds a serial driver which uses semihosting calls to read and write to the host's console. For convenience, if CONFIG_DM_SERIAL is enabled, we will instantiate a serial driver. This allows users to enable this driver (which has no physical device) without modifying their device trees or board files. We also implement a non-DM driver for SPL, or for much faster output in U-Boot proper. There are three ways to print to the console: Method Baud ================== ===== smh_putc in a loop 170 smh_puts 1600 smh_write with :tt 20000 ================== ===== These speeds were measured using a 175 character message with a J-Link adapter. For reference, U-Boot typically prints around 2700 characters during boot on this board. There are two major factors affecting the speed of these functions. First, each breakpoint incurs a delay. Second, each debugger memory transaction incurs a delay. smh_putc has a breakpoint and memory transaction for every character. smh_puts has one breakpoint, but still has to use a transaction for every character. This is because we don't know the length up front, so OpenOCD has to check if each character is nul. smh_write has only one breakpoint and one memory transfer. DM serial drivers can only implement a putc interface, so we are stuck with the slowest API. Non-DM drivers can implement puts, which is vastly more efficient. When the driver starts up, we try to open :tt. Since this is an extension, this may fail. If it does, we fall back to smh_puts. We don't check :semihosting-features, since there are nonconforming implementations (OpenOCD) which don't implement it (but *do* implement :tt). Some semihosting implementations (QEMU) don't handle READC properly. To work around this, we try to use open/read (much like for stdin) if possible. There is no non-blocking I/O available, so we don't implement pending. This will cause __serial_tstc to always return true. If CONFIG_SERIAL_RX_BUFFER is enabled, _serial_tstc will try and read characters forever. To avoid this, we depend on this config being disabled. Signed-off-by: Sean Anderson Reviewed-by: Simon Glass

global: Convert simple_strtoul() with decimal to dectoul()

2021-08-02T17:32:14Z

It is a pain to have to specify the value 10 in each call. Add a new dectoul() function and update the code to use it. Signed-off-by: Simon Glass

common: Drop asm/global_data.h from common header

2021-02-02T20:33:42Z

Move this out of the common header and include it only where needed. In a number of cases this requires adding "struct udevice;" to avoid adding another large header or in other cases replacing / adding missing header files that had been pulled in, very indirectly. Finally, we have a few cases where we did not need to include at all, so remove that include. Signed-off-by: Simon Glass Signed-off-by: Tom Rini

common: rename getc() to getchar()

2020-10-22T13:54:53Z

The sandbox is built with the SDL2 library with invokes the X11 library which in turn calls getc(). But getc() in glibc is defined as int getc(FILE *) This does not match our definition. int getc(void) The sandbox crashes when called with parameter -l. Rename our library symbol getc() to getchar(). Signed-off-by: Heinrich Schuchardt Reviewed-by: Tom Rini Reviewed-by: Simon Glass

drivers: serial: Make serial_initialize return int

2020-08-06T18:27:27Z

serial_initialize is called only during the common init sequence, after relocation (in common/board_r.c). Because it has a void return value, it has to wrapped in initr_serial. In order to be able to get rid of this indirection, make serial_initialize return int. Remove extern from prototype in order to silence the following checkpatch warning: check: extern prototypes should be avoided in .h files Reviewed-by: Simon Glass Signed-off-by: Ovidiu Panait

common: Drop linux/delay.h from common header

2020-05-19T01:19:23Z

Move this uncommon header out of the common header. Signed-off-by: Simon Glass

common: Move hang() to the same header as panic()

2020-01-17T22:53:40Z

At present panic() is in the vsprintf.h header file. That does not seem like an obvious choice for hang(), even though it relates to panic(). So let's put hang() in its own header. Signed-off-by: Simon Glass [trini: Migrate a few more files] Signed-off-by: Tom Rini