projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 3a473b2a WD |
1 | /* |
| 2 | * NS16550 Serial Port | |
| 3 | * originally from linux source (arch/ppc/boot/ns16550.h) | |
| 4 | * modified slightly to | |
| 6d0f6bcf | 5 | * have addresses as offsets from CONFIG_SYS_ISA_BASE |
| 3a473b2a WD |
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 | * | |
| 11 | * further modified to support the DUART in the Galileo eval board | |
| 12 | * modifications (c) Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc. | |
| 13 | */ | |
| 14 | ||
| 15 | #ifndef __NS16550_H__ | |
| 16 | #define __NS16550_H__ | |
| 17 | ||
| 18 | /* the padding is necessary because on the galileo board the UART is | |
| 19 | wired in with the 3 address lines shifted over by 2 bits */ | |
| 20 | struct NS16550 | |
| 21 | { | |
| 22 | unsigned char rbr; /* 0 = 0-3*/ | |
| 23 | int pad1:24; | |
| 24 | ||
| 25 | unsigned char ier; /* 1 = 4-7*/ | |
| 26 | int pad2:24; | |
| 27 | ||
| 28 | unsigned char fcr; /* 2 = 8-b*/ | |
| 29 | int pad3:24; | |
| 30 | ||
| 31 | unsigned char lcr; /* 3 = c-f*/ | |
| 32 | int pad4:24; | |
| 33 | ||
| 34 | unsigned char mcr; /* 4 = 10-13*/ | |
| 35 | int pad5:24; | |
| 36 | ||
| 37 | unsigned char lsr; /* 5 = 14-17*/ | |
| 38 | int pad6:24; | |
| 39 | ||
| 40 | unsigned char msr; /* 6 =18-1b*/ | |
| 41 | int pad7:24; | |
| 42 | ||
| 43 | unsigned char scr; /* 7 =1c-1f*/ | |
| 44 | int pad8:24; | |
| 45 | } __attribute__ ((packed)); | |
| 46 | ||
| 47 | /* aliases */ | |
| 48 | #define thr rbr | |
| 49 | #define iir fcr | |
| 50 | #define dll rbr | |
| 51 | #define dlm ier | |
| 52 | ||
| 53 | #define FCR_FIFO_EN 0x01 /*fifo enable*/ | |
| 54 | #define FCR_RXSR 0x02 /*reciever soft reset*/ | |
| 55 | #define FCR_TXSR 0x04 /*transmitter soft reset*/ | |
| 56 | ||
| 57 | ||
| 58 | #define MCR_DTR 0x01 | |
| 59 | #define MCR_RTS 0x02 | |
| 60 | #define MCR_DMA_EN 0x04 | |
| 61 | #define MCR_TX_DFR 0x08 | |
| 62 | ||
| 63 | ||
| 64 | #define LCR_WLS_MSK 0x03 /* character length slect mask*/ | |
| 65 | #define LCR_WLS_5 0x00 /* 5 bit character length */ | |
| 66 | #define LCR_WLS_6 0x01 /* 6 bit character length */ | |
| 67 | #define LCR_WLS_7 0x02 /* 7 bit character length */ | |
| 68 | #define LCR_WLS_8 0x03 /* 8 bit character length */ | |
| 69 | #define LCR_STB 0x04 /* Number of stop Bits, off = 1, on = 1.5 or 2) */ | |
| 70 | #define LCR_PEN 0x08 /* Parity eneble*/ | |
| 71 | #define LCR_EPS 0x10 /* Even Parity Select*/ | |
| 72 | #define LCR_STKP 0x20 /* Stick Parity*/ | |
| 73 | #define LCR_SBRK 0x40 /* Set Break*/ | |
| 74 | #define LCR_BKSE 0x80 /* Bank select enable*/ | |
| 75 | ||
| 76 | #define LSR_DR 0x01 /* Data ready */ | |
| 77 | #define LSR_OE 0x02 /* Overrun */ | |
| 78 | #define LSR_PE 0x04 /* Parity error */ | |
| 79 | #define LSR_FE 0x08 /* Framing error */ | |
| 80 | #define LSR_BI 0x10 /* Break */ | |
| 81 | #define LSR_THRE 0x20 /* Xmit holding register empty */ | |
| 82 | #define LSR_TEMT 0x40 /* Xmitter empty */ | |
| 83 | #define LSR_ERR 0x80 /* Error */ | |
| 84 | ||
| 85 | /* useful defaults for LCR*/ | |
| 86 | #define LCR_8N1 0x03 | |
| 87 | ||
| 88 | ||
| 89 | #define COM1 0x03F8 | |
| 90 | #define COM2 0x02F8 | |
| 91 | ||
| 92 | volatile struct NS16550 * NS16550_init(int chan, int baud_divisor); | |
| 93 | void NS16550_putc(volatile struct NS16550 *com_port, unsigned char c); | |
| 94 | unsigned char NS16550_getc(volatile struct NS16550 *com_port); | |
| 95 | int NS16550_tstc(volatile struct NS16550 *com_port); | |
| 96 | void NS16550_reinit(volatile struct NS16550 *com_port, int baud_divisor); | |
| 97 | ||
| 98 | typedef struct NS16550 *NS16550_t; | |
| 99 | ||
| 100 | extern const NS16550_t COM_PORTS[]; | |
| 101 | ||
| 102 | #endif |