1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Copyright (C) 2016 Socionext Inc. 4 * Author: Masahiro Yamada <yamada.masahiro (at) socionext.com> 5 */ 6 7 #ifndef __DEBUG_H__ 8 #define __DEBUG_H__ 9 10 #include <linux/io.h> 11 #include <linux/serial_reg.h> 12 13 #define DEBUG_UART_BASE 0x54006800 14 #define UART_SHIFT 2 15 16 #define UNIPHIER_UART_TX 0 17 #define UNIPHIER_UART_LSR (5 * 4) 18 19 /* All functions are inline so that they can be called from .secure section. */ 20 21 #ifdef DEBUG 22 static inline void debug_putc(int c) 23 { 24 void __iomem *base = (void __iomem *)DEBUG_UART_BASE; 25 26 while (!(readl(base + UNIPHIER_UART_LSR) & UART_LSR_THRE)) 27 ; 28 29 writel(c, base + UNIPHIER_UART_TX); 30 } 31 32 static inline void debug_puts(const char *s) 33 { 34 while (*s) { 35 if (*s == '\n') 36 debug_putc('\r'); 37 38 debug_putc(*s++); 39 } 40 } 41 42 static inline void debug_puth(unsigned long val) 43 { 44 int i; 45 unsigned char c; 46 47 for (i = 8; i--; ) { 48 c = ((val >> (i * 4)) & 0xf); 49 c += (c >= 10) ? 'a' - 10 : '0'; 50 debug_putc(c); 51 } 52 } 53 #else 54 static inline void debug_putc(int c) 55 { 56 } 57 58 static inline void debug_puts(const char *s) 59 { 60 } 61 62 static inline void debug_puth(unsigned long val) 63 { 64 } 65 #endif 66 67 #endif /* __DEBUG_H__ */ 68
