mirror of
https://github.com/brain-hackers/u-boot-brain
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
182 lines
4.2 KiB
C
182 lines
4.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Early debug UART support
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*
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* (C) Copyright 2014 Google, Inc
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* Writte by Simon Glass <sjg@chromium.org>
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*/
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#ifndef _DEBUG_UART_H
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#define _DEBUG_UART_H
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/*
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* The debug UART is intended for use very early in U-Boot to debug problems
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* when an ICE or other debug mechanism is not available.
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*
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* To use it you should:
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* - Make sure your UART supports this interface
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* - Enable CONFIG_DEBUG_UART
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* - Enable the CONFIG for your UART to tell it to provide this interface
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* (e.g. CONFIG_DEBUG_UART_NS16550)
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* - Define the required settings as needed (see below)
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* - Call debug_uart_init() before use
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* - Call printch() to output a character
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*
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* Depending on your platform it may be possible to use this UART before a
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* stack is available.
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*
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* If your UART does not support this interface you can probably add support
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* quite easily. Remember that you cannot use driver model and it is preferred
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* to use no stack.
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*
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* You must not use this UART once driver model is working and the serial
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* drivers are up and running (done in serial_init()). Otherwise the drivers
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* may conflict and you will get strange output.
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*
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*
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* To enable the debug UART in your serial driver:
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*
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* - #include <debug_uart.h>
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* - Define _debug_uart_init(), trying to avoid using the stack
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* - Define _debug_uart_putc() as static inline (avoiding stack usage)
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* - Immediately afterwards, add DEBUG_UART_FUNCS to define the rest of the
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* functionality (printch(), etc.)
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*
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* If your board needs additional init for the UART to work, enable
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* CONFIG_DEBUG_UART_BOARD_INIT and write a function called
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* board_debug_uart_init() to perform that init. When debug_uart_init() is
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* called, the init will happen automatically.
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*/
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/**
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* debug_uart_init() - Set up the debug UART ready for use
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*
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* This sets up the UART with the correct baud rate, etc.
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*
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* Available CONFIG is:
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*
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* - CONFIG_DEBUG_UART_BASE: Base address of UART
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* - CONFIG_BAUDRATE: Requested baud rate
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* - CONFIG_DEBUG_UART_CLOCK: Input clock for UART
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*/
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void debug_uart_init(void);
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#ifdef CONFIG_DEBUG_UART_BOARD_INIT
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void board_debug_uart_init(void);
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#else
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static inline void board_debug_uart_init(void)
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{
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}
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#endif
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/**
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* printch() - Output a character to the debug UART
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*
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* @ch: Character to output
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*/
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void printch(int ch);
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/**
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* printascii() - Output an ASCII string to the debug UART
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*
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* @str: String to output
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*/
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void printascii(const char *str);
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/**
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* printhex2() - Output a 2-digit hex value
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*
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* @value: Value to output
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*/
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void printhex2(uint value);
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/**
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* printhex4() - Output a 4-digit hex value
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*
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* @value: Value to output
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*/
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void printhex4(uint value);
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/**
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* printhex8() - Output a 8-digit hex value
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*
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* @value: Value to output
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*/
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void printhex8(uint value);
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#ifdef CONFIG_DEBUG_UART_ANNOUNCE
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#define _DEBUG_UART_ANNOUNCE printascii("<debug_uart> ");
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#else
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#define _DEBUG_UART_ANNOUNCE
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#endif
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#define serial_dout(reg, value) \
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serial_out_shift((char *)com_port + \
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((char *)reg - (char *)com_port) * \
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(1 << CONFIG_DEBUG_UART_SHIFT), \
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CONFIG_DEBUG_UART_SHIFT, value)
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#define serial_din(reg) \
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serial_in_shift((char *)com_port + \
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((char *)reg - (char *)com_port) * \
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(1 << CONFIG_DEBUG_UART_SHIFT), \
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CONFIG_DEBUG_UART_SHIFT)
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/*
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* Now define some functions - this should be inserted into the serial driver
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*/
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#define DEBUG_UART_FUNCS \
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\
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static inline void _printch(int ch) \
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{ \
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if (ch == '\n') \
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_debug_uart_putc('\r'); \
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_debug_uart_putc(ch); \
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} \
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\
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void printch(int ch) \
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{ \
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_printch(ch); \
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} \
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\
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void printascii(const char *str) \
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{ \
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while (*str) \
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_printch(*str++); \
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} \
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\
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static inline void printhex1(uint digit) \
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{ \
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digit &= 0xf; \
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_debug_uart_putc(digit > 9 ? digit - 10 + 'a' : digit + '0'); \
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} \
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\
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static inline void printhex(uint value, int digits) \
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{ \
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while (digits-- > 0) \
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printhex1(value >> (4 * digits)); \
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} \
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\
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void printhex2(uint value) \
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{ \
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printhex(value, 2); \
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} \
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\
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void printhex4(uint value) \
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{ \
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printhex(value, 4); \
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} \
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\
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void printhex8(uint value) \
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{ \
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printhex(value, 8); \
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} \
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\
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void debug_uart_init(void) \
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{ \
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board_debug_uart_init(); \
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_debug_uart_init(); \
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_DEBUG_UART_ANNOUNCE \
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} \
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#endif
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