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https://github.com/AsahiLinux/u-boot
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102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
/*
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* NS16550 Serial Port
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* originally from linux source (arch/ppc/boot/ns16550.h)
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* modified slightly to
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* have addresses as offsets from CONFIG_SYS_ISA_BASE
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* added a few more definitions
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* added prototypes for ns16550.c
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* reduced no of com ports to 2
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* modifications (c) Rob Taylor, Flying Pig Systems. 2000.
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*
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* further modified to support the DUART in the Galileo eval board
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* modifications (c) Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
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*/
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#ifndef __NS16550_H__
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#define __NS16550_H__
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/* the padding is necessary because on the galileo board the UART is
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wired in with the 3 address lines shifted over by 2 bits */
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struct NS16550
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{
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unsigned char rbr; /* 0 = 0-3*/
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int pad1:24;
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unsigned char ier; /* 1 = 4-7*/
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int pad2:24;
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unsigned char fcr; /* 2 = 8-b*/
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int pad3:24;
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unsigned char lcr; /* 3 = c-f*/
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int pad4:24;
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unsigned char mcr; /* 4 = 10-13*/
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int pad5:24;
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unsigned char lsr; /* 5 = 14-17*/
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int pad6:24;
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unsigned char msr; /* 6 =18-1b*/
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int pad7:24;
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unsigned char scr; /* 7 =1c-1f*/
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int pad8:24;
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} __attribute__ ((packed));
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/* aliases */
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#define thr rbr
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#define iir fcr
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#define dll rbr
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#define dlm ier
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#define FCR_FIFO_EN 0x01 /*fifo enable*/
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#define FCR_RXSR 0x02 /*reciever soft reset*/
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#define FCR_TXSR 0x04 /*transmitter soft reset*/
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#define MCR_DTR 0x01
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#define MCR_RTS 0x02
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#define MCR_DMA_EN 0x04
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#define MCR_TX_DFR 0x08
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#define LCR_WLS_MSK 0x03 /* character length slect mask*/
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#define LCR_WLS_5 0x00 /* 5 bit character length */
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#define LCR_WLS_6 0x01 /* 6 bit character length */
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#define LCR_WLS_7 0x02 /* 7 bit character length */
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#define LCR_WLS_8 0x03 /* 8 bit character length */
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#define LCR_STB 0x04 /* Number of stop Bits, off = 1, on = 1.5 or 2) */
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#define LCR_PEN 0x08 /* Parity eneble*/
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#define LCR_EPS 0x10 /* Even Parity Select*/
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#define LCR_STKP 0x20 /* Stick Parity*/
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#define LCR_SBRK 0x40 /* Set Break*/
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#define LCR_BKSE 0x80 /* Bank select enable*/
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#define LSR_DR 0x01 /* Data ready */
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#define LSR_OE 0x02 /* Overrun */
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#define LSR_PE 0x04 /* Parity error */
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#define LSR_FE 0x08 /* Framing error */
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#define LSR_BI 0x10 /* Break */
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#define LSR_THRE 0x20 /* Xmit holding register empty */
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#define LSR_TEMT 0x40 /* Xmitter empty */
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#define LSR_ERR 0x80 /* Error */
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/* useful defaults for LCR*/
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#define LCR_8N1 0x03
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#define COM1 0x03F8
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#define COM2 0x02F8
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volatile struct NS16550 * NS16550_init(int chan, int baud_divisor);
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void NS16550_putc(volatile struct NS16550 *com_port, unsigned char c);
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unsigned char NS16550_getc(volatile struct NS16550 *com_port);
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int NS16550_tstc(volatile struct NS16550 *com_port);
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void NS16550_reinit(volatile struct NS16550 *com_port, int baud_divisor);
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typedef struct NS16550 *NS16550_t;
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extern const NS16550_t COM_PORTS[];
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#endif
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