53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* 16550 compatible uart based serial debug support for zboot
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*/
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#include <linux/types.h>
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#include <linux/serial_reg.h>
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#include <asm/addrspace.h>
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#if defined(CONFIG_MACH_LOONGSON64) || defined(CONFIG_MIPS_MALTA)
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#define UART_BASE 0x1fd003f8
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#define PORT(offset) (CKSEG1ADDR(UART_BASE) + (offset))
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#endif
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#ifdef CONFIG_AR7
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#include <ar7.h>
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#define PORT(offset) (CKSEG1ADDR(AR7_REGS_UART0) + (4 * offset))
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#endif
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#ifdef CONFIG_MACH_INGENIC
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#define INGENIC_UART_BASE_ADDR (0x10030000 + 0x1000 * CONFIG_ZBOOT_INGENIC_UART)
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#define PORT(offset) (CKSEG1ADDR(INGENIC_UART_BASE_ADDR) + (4 * offset))
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#endif
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#ifndef IOTYPE
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#define IOTYPE char
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#endif
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#ifndef PORT
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#error please define the serial port address for your own machine
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#endif
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static inline unsigned int serial_in(int offset)
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{
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return *((volatile IOTYPE *)PORT(offset)) & 0xFF;
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}
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static inline void serial_out(int offset, int value)
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{
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*((volatile IOTYPE *)PORT(offset)) = value & 0xFF;
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}
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void putc(char c)
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{
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int timeout = 1000000;
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while (((serial_in(UART_LSR) & UART_LSR_THRE) == 0) && (timeout-- > 0))
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;
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serial_out(UART_TX, c);
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}
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