/* * Copyright (C) 2017 Oleksij Rempel <o.rempel@pengutronix.de> * Copyright (C) 2012, 2013 Antony Pavlov <antonynpavlov@gmail.com> * * This file is part of barebox. * See file CREDITS for list of people who contributed to this project. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #ifndef __AR9344_DEBUG_LL__ #define __AR9344_DEBUG_LL__ #include <asm/asm.h> #include <asm/addrspace.h> #include <mach/ar71xx_regs.h> #include <asm/regdef.h> #define DEBUG_LL_UART_ADDR KSEG1ADDR(AR934X_UART0_BASE) #define DEBUG_LL_UART_SHIFT AR934X_UART0_SHIFT #define DEBUG_LL_UART_DIVISOR_40 (40000000 / (16 * CONFIG_BAUDRATE)) #define DEBUG_LL_UART_DIVISOR_25 (25000000 / (16 * CONFIG_BAUDRATE)) #define UART_THR (0x0 << DEBUG_LL_UART_SHIFT) #define UART_RBR (0x0 << DEBUG_LL_UART_SHIFT) #define UART_DLL (0x0 << DEBUG_LL_UART_SHIFT) #define UART_IER (0x1 << DEBUG_LL_UART_SHIFT) #define UART_DLM (0x1 << DEBUG_LL_UART_SHIFT) #define UART_FCR (0x2 << DEBUG_LL_UART_SHIFT) #define UART_LCR (0x3 << DEBUG_LL_UART_SHIFT) #define UART_LSR (0x5 << DEBUG_LL_UART_SHIFT) #define UART_LCR_W 0x07 /* Set UART to 8,N,2 & DLAB = 0 */ #define UART_LCR_DLAB 0x87 /* Set UART to 8,N,2 & DLAB = 1 */ #define UART_LSR_DR 0x01 /* UART received data present */ #define UART_LSR_THRE 0x20 /* Xmit holding register empty */ #define UART_FCR_RST 0x07 /* FIFO_EN | RCVR_FIFO_RST | XMIT_FIFO_RST */ #ifndef __ASSEMBLY__ /* * C macros */ #include <asm/io.h> static inline void PUTC_LL(char ch) { #ifdef CONFIG_DEBUG_LL while (!(__raw_readl((u8 *)DEBUG_LL_UART_ADDR + UART_LSR) & UART_LSR_THRE)) ; __raw_writel(ch, (u8 *)DEBUG_LL_UART_ADDR + UART_THR); #endif /* CONFIG_DEBUG_LL */ } #else /* __ASSEMBLY__ */ /* * Macros for use in assembly language code */ .macro debug_ll_ath79_init #ifdef CONFIG_DEBUG_LL /* find out the ref clock */ li t5, KSEG1ADDR(WASP_BOOTSTRAP_REG); li t6, WASP_REF_CLK_25 lw t7, 0(t5); and t6, t7, t6 beq zero, t6, uart_setup_ref25_val nop uart_setup_ref40_val: li t5, DEBUG_LL_UART_DIVISOR_40 b 1f nop uart_setup_ref25_val: li t5, DEBUG_LL_UART_DIVISOR_25 1: la t0, DEBUG_LL_UART_ADDR li t1, UART_LCR_DLAB /* DLAB on */ sw t1, UART_LCR(t0) /* Write it out */ sw t5, UART_DLL(t0) /* write low order byte */ li t1, 0 sw t1, UART_DLM(t0) /* write high order byte */ li t1, UART_LCR_W /* DLAB off */ sw t1, UART_LCR(t0) /* Write it out */ li t1, UART_FCR_RST /* reset FIFOs */ sw t1, UART_FCR(t0) /* Write it out */ li t1, 0 /* disable interrupts */ sw t1, UART_IER(t0) /* Write it out */ #endif /* CONFIG_DEBUG_LL */ .endm /* * output a character in a0 */ .macro debug_ll_outc_a0 #ifdef CONFIG_DEBUG_LL .set push .set reorder la t0, DEBUG_LL_UART_ADDR 201: lw t1, UART_LSR(t0) /* get line status */ andi t1, t1, UART_LSR_THRE /* check for transmitter empty */ beqz t1, 201b /* try again */ sw a0, UART_THR(t0) /* write the character */ .set pop #endif /* CONFIG_DEBUG_LL */ .endm /* * output a character */ .macro debug_ll_outc chr #ifdef CONFIG_DEBUG_LL li a0, \chr debug_ll_outc_a0 #endif /* CONFIG_DEBUG_LL */ .endm /* * output CR + NL */ .macro debug_ll_outnl #ifdef CONFIG_DEBUG_LL debug_ll_outc '\r' debug_ll_outc '\n' #endif /* CONFIG_DEBUG_LL */ .endm /* * check character in input buffer * return value: * v0 = 0 no character in input buffer * v0 != 0 character in input buffer */ .macro debug_ll_tstc #ifdef CONFIG_DEBUG_LL .set push .set reorder la t0, DEBUG_LL_UART_ADDR /* get line status and check for data present */ lw t1, UART_LSR(t0) andi v0, t1, UART_LSR_DR .set pop #endif /* CONFIG_DEBUG_LL */ .endm /* * get character to v0 */ .macro debug_ll_getc #ifdef CONFIG_DEBUG_LL .set push .set reorder 204: debug_ll_tstc /* try again */ beqz v0, 204b /* read a character */ lw v0, UART_RBR(t0) .set pop #endif /* CONFIG_DEBUG_LL */ .endm #endif /* __ASSEMBLY__ */ #endif /* __INCLUDE_MIPS_ASM_DEBUG_LL_NS16550_H__ */