60 lines
1.1 KiB
C
60 lines
1.1 KiB
C
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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 <linux/init.h>
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#include <asm/addrspace.h>
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#if defined(CONFIG_MACH_LOONGSON) || 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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#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 *((char *)PORT(offset));
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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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*((char *)PORT(offset)) = value;
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}
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void putc(char c)
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{
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#if 0
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int timeout = 1024;
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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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#else
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unsigned int timeout = 1000;
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unsigned char *lsr = (unsigned char *)(0xbf004080 + 0x5);
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unsigned char status;
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char *sdata = (unsigned char *)0xbf004080;
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while (timeout--) {
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status = *lsr;
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if (status & 0x20)
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break;
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};
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if (timeout) //successful
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*sdata = c;
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#endif
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}
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