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64 lines
1.4 KiB
64 lines
1.4 KiB
// 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_UART0_BASE_ADDR 0x10030000 |
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#define PORT(offset) (CKSEG1ADDR(INGENIC_UART0_BASE_ADDR) + (4 * offset)) |
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#endif |
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#ifdef CONFIG_CPU_XLR |
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#define UART0_BASE 0x1EF14000 |
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#define PORT(offset) (CKSEG1ADDR(UART0_BASE) + (4 * offset)) |
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#define IOTYPE unsigned int |
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#endif |
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#ifdef CONFIG_CPU_XLP |
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#define UART0_BASE 0x18030100 |
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#define PORT(offset) (CKSEG1ADDR(UART0_BASE) + (4 * offset)) |
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#define IOTYPE unsigned int |
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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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