mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-15 15:53:02 +00:00
974f48366f
On certain places it is required to flush output print buffers to ensure that text strings were sent to console or serial devices. For example when printing message that U-Boot is going to boot kernel or when U-Boot is going to change baudrate of terminal device. Therefore introduce a new flush() and fflush() functions into console code. These functions will call .flush callback of associated stdio_dev device. As this function may increase U-Boot side, allow to compile U-Boot without this function. For this purpose there is a new config CONSOLE_FLUSH_SUPPORT which is enabled by default and can be disabled. It is a good idea to have this option enabled for all boards which have enough space for it. When option is disabled when U-Boot defines just empty static inline function fflush() to avoid ifdefs in other code. Signed-off-by: Pali Rohár <pali@kernel.org> Reviewed-by: Simon Glass <sjg@chromium.org>
118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* (C) Copyright 2000
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* Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
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*/
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#ifndef _STDIO_DEV_H_
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#define _STDIO_DEV_H_
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#include <stdio.h>
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#include <linux/list.h>
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/*
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* STDIO DEVICES
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*/
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#define DEV_FLAGS_INPUT 0x00000001 /* Device can be used as input console */
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#define DEV_FLAGS_OUTPUT 0x00000002 /* Device can be used as output console */
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#define DEV_FLAGS_DM 0x00000004 /* Device priv is a struct udevice * */
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int stdio_file_to_flags(const int file);
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/* Device information */
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struct stdio_dev {
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int flags; /* Device flags: input/output/system */
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int ext; /* Supported extensions */
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char name[32]; /* Device name */
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/* GENERAL functions */
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int (*start)(struct stdio_dev *dev); /* To start the device */
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int (*stop)(struct stdio_dev *dev); /* To stop the device */
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/* OUTPUT functions */
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/* To put a char */
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void (*putc)(struct stdio_dev *dev, const char c);
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/* To put a string (accelerator) */
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void (*puts)(struct stdio_dev *dev, const char *s);
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#ifdef CONFIG_CONSOLE_FLUSH_SUPPORT
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/* To flush output queue */
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void (*flush)(struct stdio_dev *dev);
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#define STDIO_DEV_ASSIGN_FLUSH(dev, flush_func) ((dev)->flush = (flush_func))
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#else
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#define STDIO_DEV_ASSIGN_FLUSH(dev, flush_func)
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#endif
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/* INPUT functions */
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/* To test if a char is ready... */
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int (*tstc)(struct stdio_dev *dev);
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int (*getc)(struct stdio_dev *dev); /* To get that char */
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/* Other functions */
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void *priv; /* Private extensions */
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struct list_head list;
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};
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/*
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* VARIABLES
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*/
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extern struct stdio_dev *stdio_devices[];
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extern char *stdio_names[MAX_FILES];
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/*
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* PROTOTYPES
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*/
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int stdio_register(struct stdio_dev *dev);
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int stdio_register_dev(struct stdio_dev *dev, struct stdio_dev **devp);
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/**
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* stdio_init_tables() - set up stdio tables ready for devices
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*
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* This does not add any devices, but just prepares stdio for use.
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*/
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int stdio_init_tables(void);
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/**
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* stdio_add_devices() - Add stdio devices to the table
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*
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* This makes calls to all the various subsystems that use stdio, to make
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* them register with stdio.
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*/
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int stdio_add_devices(void);
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/**
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* stdio_init() - Sets up stdio ready for use
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*
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* This calls stdio_init_tables() and stdio_add_devices()
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*/
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int stdio_init(void);
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void stdio_print_current_devices(void);
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/**
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* stdio_deregister_dev() - deregister the device "devname".
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*
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* @dev: Stdio device to deregister
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* @force: true to force deregistration even if in use
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*
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* returns 0 on success, -EBUSY if device is assigned
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*/
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int stdio_deregister_dev(struct stdio_dev *dev, int force);
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struct list_head *stdio_get_list(void);
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struct stdio_dev *stdio_get_by_name(const char *name);
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struct stdio_dev *stdio_clone(struct stdio_dev *dev);
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int drv_lcd_init(void);
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int drv_video_init(void);
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int drv_keyboard_init(void);
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int drv_usbtty_init(void);
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int drv_usbacm_init(void);
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int drv_nc_init(void);
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int drv_jtag_console_init(void);
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int cbmemc_init(void);
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#endif
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