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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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45 lines
1.0 KiB
C
45 lines
1.0 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
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*/
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#include <linux/mm.h>
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#include <linux/io.h>
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#include <linux/serial_reg.h>
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#include "devices.h"
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#include "ar2315_regs.h"
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#include "ar5312_regs.h"
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static inline void prom_uart_wr(void __iomem *base, unsigned reg,
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unsigned char ch)
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{
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__raw_writel(ch, base + 4 * reg);
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}
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static inline unsigned char prom_uart_rr(void __iomem *base, unsigned reg)
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{
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return __raw_readl(base + 4 * reg);
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}
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void prom_putchar(unsigned char ch)
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{
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static void __iomem *base;
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if (unlikely(base == NULL)) {
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if (is_ar2315())
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base = (void __iomem *)(KSEG1ADDR(AR2315_UART0_BASE));
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else
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base = (void __iomem *)(KSEG1ADDR(AR5312_UART0_BASE));
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}
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while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
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;
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prom_uart_wr(base, UART_TX, ch);
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while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
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;
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}
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