mirror of
https://github.com/AsahiLinux/u-boot
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79 lines
2.7 KiB
C
79 lines
2.7 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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* further modified to support the 8245 duart
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* modifications (c) Paul Jimenez, Musenki, Inc. 2001.
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*/
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struct NS16550 {
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unsigned char rbrthrdlb; /* 0 */
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unsigned char ierdmb; /* 1 */
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unsigned char iirfcrafr; /* 2 */
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unsigned char lcr; /* 3 */
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unsigned char mcr; /* 4 */
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unsigned char lsr; /* 5 */
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unsigned char msr; /* 6 */
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unsigned char scr; /* 7 */
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unsigned char reserved[2]; /* 8 & 9 */
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unsigned char dsr; /* 10 */
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unsigned char dcr; /* 11 */
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};
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#define rbr rbrthrdlb
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#define thr rbrthrdlb
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#define dll rbrthrdlb
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#define ier ierdmb
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#define dlm ierdmb
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#define iir iirfcrafr
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#define fcr iirfcrafr
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#define afr iirfcrafr
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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 FCR_DMS 0x08 /* DMA Mode Select */
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#define MCR_RTS 0x02 /* Readyu to Send */
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#define MCR_LOOP 0x10 /* Local loopback mode enable */
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/* #define MCR_DTR 0x01 noton 8245 duart */
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/* #define MCR_DMA_EN 0x04 noton 8245 duart */
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/* #define MCR_TX_DFR 0x08 noton 8245 duart */
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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 - aka DLAB on 8245 */
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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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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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