81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/*
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* Copyright (C) 2011
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* Author: Jan Weitzel <j.weitzel@phytec.de>
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* based on arch/arm/mach-versatile/include/mach/debug_ll.h
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*
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* barebox is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* barebox is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __MACH_DEBUG_LL_H__
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#define __MACH_DEBUG_LL_H__
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#include <io.h>
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#include <mach/omap3-silicon.h>
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#include <mach/omap4-silicon.h>
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#include <mach/am33xx-silicon.h>
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#define LSR_THRE 0x20 /* Xmit holding register empty */
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#define LCR_BKSE 0x80 /* Bank select enable */
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#define LSR (5 << 2)
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#define THR (0 << 2)
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#define DLL (0 << 2)
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#define IER (1 << 2)
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#define DLM (1 << 2)
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#define FCR (2 << 2)
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#define LCR (3 << 2)
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#define MCR (4 << 2)
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#define MDR (8 << 2)
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static inline void omap_uart_lowlevel_init(void __iomem *base)
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{
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writeb(0x00, base + LCR);
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writeb(0x00, base + IER);
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writeb(0x07, base + MDR);
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writeb(LCR_BKSE, base + LCR);
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writeb(26, base + DLL); /* 115200 */
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writeb(0, base + DLM);
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writeb(0x03, base + LCR);
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writeb(0x03, base + MCR);
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writeb(0x07, base + FCR);
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writeb(0x00, base + MDR);
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}
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#ifdef CONFIG_DEBUG_LL
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#ifdef CONFIG_DEBUG_OMAP3_UART
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#define OMAP_DEBUG_SOC OMAP3
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#elif defined CONFIG_DEBUG_OMAP4_UART
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#define OMAP_DEBUG_SOC OMAP44XX
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#elif defined CONFIG_DEBUG_AM33XX_UART
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#define OMAP_DEBUG_SOC AM33XX
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#else
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#error "unknown OMAP debug uart soc type"
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#endif
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#define __OMAP_UART_BASE(soc, num) soc##_UART##num##_BASE
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#define OMAP_UART_BASE(soc, num) __OMAP_UART_BASE(soc, num)
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static inline void PUTC_LL(char c)
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{
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void __iomem *base = (void *)OMAP_UART_BASE(OMAP_DEBUG_SOC,
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CONFIG_DEBUG_OMAP_UART_PORT);
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/* Wait until there is space in the FIFO */
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while ((readb(base + LSR) & LSR_THRE) == 0);
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/* Send the character */
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writeb(c, base + THR);
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/* Wait to make sure it hits the line, in case we die too soon. */
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while ((readb(base + LSR) & LSR_THRE) == 0);
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}
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#endif
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#endif
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