| wdenk | 71fc6c5 | 2002-08-06 19:52:25 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * NS16550 Serial Port |
| 3 | * originally from linux source (arch/ppc/boot/ns16550.h) |
| 4 | * modified slightly to |
| 5 | * have addresses as offsets from CFG_ISA_BASE |
| 6 | * added a few more definitions |
| 7 | * added prototypes for ns16550.c |
| 8 | * reduced no of com ports to 2 |
| 9 | * modifications (c) Rob Taylor, Flying Pig Systems. 2000. |
| 10 | * further modified to support the 8245 duart |
| 11 | * modifications (c) Paul Jimenez, Musenki, Inc. 2001. |
| 12 | */ |
| 13 | |
| 14 | |
| 15 | struct NS16550 |
| 16 | { |
| 17 | unsigned char rbrthrdlb; /* 0 */ |
| 18 | unsigned char ierdmb; /* 1 */ |
| 19 | unsigned char iirfcrafr; /* 2 */ |
| 20 | unsigned char lcr; /* 3 */ |
| 21 | unsigned char mcr; /* 4 */ |
| 22 | unsigned char lsr; /* 5 */ |
| 23 | unsigned char msr; /* 6 */ |
| 24 | unsigned char scr; /* 7 */ |
| 25 | unsigned char reserved[2]; /* 8 & 9 */ |
| 26 | unsigned char dsr; /* 10 */ |
| 27 | unsigned char dcr; /* 11 */ |
| 28 | }; |
| 29 | |
| 30 | |
| 31 | #define rbr rbrthrdlb |
| 32 | #define thr rbrthrdlb |
| 33 | #define dll rbrthrdlb |
| 34 | #define ier ierdmb |
| 35 | #define dlm ierdmb |
| 36 | #define iir iirfcrafr |
| 37 | #define fcr iirfcrafr |
| 38 | #define afr iirfcrafr |
| 39 | |
| 40 | #define FCR_FIFO_EN 0x01 /*fifo enable*/ |
| 41 | #define FCR_RXSR 0x02 /*reciever soft reset*/ |
| 42 | #define FCR_TXSR 0x04 /*transmitter soft reset*/ |
| 43 | #define FCR_DMS 0x08 /* DMA Mode Select */ |
| 44 | |
| 45 | #define MCR_RTS 0x02 /* Readyu to Send */ |
| 46 | #define MCR_LOOP 0x10 /* Local loopback mode enable */ |
| 47 | /* #define MCR_DTR 0x01 noton 8245 duart */ |
| 48 | /* #define MCR_DMA_EN 0x04 noton 8245 duart */ |
| 49 | /* #define MCR_TX_DFR 0x08 noton 8245 duart */ |
| 50 | |
| 51 | #define LCR_WLS_MSK 0x03 /* character length slect mask*/ |
| 52 | #define LCR_WLS_5 0x00 /* 5 bit character length */ |
| 53 | #define LCR_WLS_6 0x01 /* 6 bit character length */ |
| 54 | #define LCR_WLS_7 0x02 /* 7 bit character length */ |
| 55 | #define LCR_WLS_8 0x03 /* 8 bit character length */ |
| 56 | #define LCR_STB 0x04 /* Number of stop Bits, off = 1, on = 1.5 or 2) */ |
| 57 | #define LCR_PEN 0x08 /* Parity eneble*/ |
| 58 | #define LCR_EPS 0x10 /* Even Parity Select*/ |
| 59 | #define LCR_STKP 0x20 /* Stick Parity*/ |
| 60 | #define LCR_SBRK 0x40 /* Set Break*/ |
| 61 | #define LCR_BKSE 0x80 /* Bank select enable - aka DLAB on 8245 */ |
| 62 | |
| 63 | #define LSR_DR 0x01 /* Data ready */ |
| 64 | #define LSR_OE 0x02 /* Overrun */ |
| 65 | #define LSR_PE 0x04 /* Parity error */ |
| 66 | #define LSR_FE 0x08 /* Framing error */ |
| 67 | #define LSR_BI 0x10 /* Break */ |
| 68 | #define LSR_THRE 0x20 /* Xmit holding register empty */ |
| 69 | #define LSR_TEMT 0x40 /* Xmitter empty */ |
| 70 | #define LSR_ERR 0x80 /* Error */ |
| 71 | |
| 72 | /* useful defaults for LCR*/ |
| 73 | #define LCR_8N1 0x03 |
| 74 | |
| 75 | |
| 76 | volatile struct NS16550 * NS16550_init(int chan, int baud_divisor); |
| 77 | void NS16550_putc(volatile struct NS16550 *com_port, unsigned char c); |
| 78 | unsigned char NS16550_getc(volatile struct NS16550 *com_port); |
| 79 | int NS16550_tstc(volatile struct NS16550 *com_port); |
| 80 | void NS16550_reinit(volatile struct NS16550 *com_port, int baud_divisor); |
| 81 | |