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 */ 11 12 #if (CFG_NS16550_REG_SIZE == 1) 13 struct NS16550 { 14 unsigned char rbr; /* 0 */ 15 unsigned char ier; /* 1 */ 16 unsigned char fcr; /* 2 */ 17 unsigned char lcr; /* 3 */ 18 unsigned char mcr; /* 4 */ 19 unsigned char lsr; /* 5 */ 20 unsigned char msr; /* 6 */ 21 unsigned char scr; /* 7 */ 22 } __attribute__ ((packed)); 23 #elif (CFG_NS16550_REG_SIZE == 2) 24 struct NS16550 { 25 unsigned short rbr; /* 0 */ 26 unsigned short ier; /* 1 */ 27 unsigned short fcr; /* 2 */ 28 unsigned short lcr; /* 3 */ 29 unsigned short mcr; /* 4 */ 30 unsigned short lsr; /* 5 */ 31 unsigned short msr; /* 6 */ 32 unsigned short scr; /* 7 */ 33 } __attribute__ ((packed)); 34 #elif (CFG_NS16550_REG_SIZE == 4) 35 struct NS16550 { 36 unsigned long rbr; /* 0 */ 37 unsigned long ier; /* 1 */ 38 unsigned long fcr; /* 2 */ 39 unsigned long lcr; /* 3 */ 40 unsigned long mcr; /* 4 */ 41 unsigned long lsr; /* 5 */ 42 unsigned long msr; /* 6 */ 43 unsigned long scr; /* 7 */ 44 } __attribute__ ((packed)); 45 #elif (CFG_NS16550_REG_SIZE == -4) 46 struct NS16550 { 47 unsigned char rbr; /* 0 */ 48 int pad1:24; 49 unsigned char ier; /* 1 */ 50 int pad2:24; 51 unsigned char fcr; /* 2 */ 52 int pad3:24; 53 unsigned char lcr; /* 3 */ 54 int pad4:24; 55 unsigned char mcr; /* 4 */ 56 int pad5:24; 57 unsigned char lsr; /* 5 */ 58 int pad6:24; 59 unsigned char msr; /* 6 */ 60 int pad7:24; 61 unsigned char scr; /* 7 */ 62 int pad8:24; 63 } __attribute__ ((packed)); 64 #else 65 #error "Please define NS16550 registers size." 66 #endif 67 68 #define thr rbr 69 #define iir fcr 70 #define dll rbr 71 #define dlm ier 72 73 typedef volatile struct NS16550 *NS16550_t; 74 75 #define FCR_FIFO_EN 0x01 /* Fifo enable */ 76 #define FCR_RXSR 0x02 /* Receiver soft reset */ 77 #define FCR_TXSR 0x04 /* Transmitter soft reset */ 78 79 #define MCR_DTR 0x01 80 #define MCR_RTS 0x02 81 #define MCR_DMA_EN 0x04 82 #define MCR_TX_DFR 0x08 83 84 #define LCR_WLS_MSK 0x03 /* character length slect mask */ 85 #define LCR_WLS_5 0x00 /* 5 bit character length */ 86 #define LCR_WLS_6 0x01 /* 6 bit character length */ 87 #define LCR_WLS_7 0x02 /* 7 bit character length */ 88 #define LCR_WLS_8 0x03 /* 8 bit character length */ 89 #define LCR_STB 0x04 /* Number of stop Bits, off = 1, on = 1.5 or 2) */ 90 #define LCR_PEN 0x08 /* Parity eneble */ 91 #define LCR_EPS 0x10 /* Even Parity Select */ 92 #define LCR_STKP 0x20 /* Stick Parity */ 93 #define LCR_SBRK 0x40 /* Set Break */ 94 #define LCR_BKSE 0x80 /* Bank select enable */ 95 96 #define LSR_DR 0x01 /* Data ready */ 97 #define LSR_OE 0x02 /* Overrun */ 98 #define LSR_PE 0x04 /* Parity error */ 99 #define LSR_FE 0x08 /* Framing error */ 100 #define LSR_BI 0x10 /* Break */ 101 #define LSR_THRE 0x20 /* Xmit holding register empty */ 102 #define LSR_TEMT 0x40 /* Xmitter empty */ 103 #define LSR_ERR 0x80 /* Error */ 104 105 /* useful defaults for LCR */ 106 #define LCR_8N1 0x03 107 108 void NS16550_init (NS16550_t com_port, int baud_divisor); 109 void NS16550_putc (NS16550_t com_port, char c); 110 char NS16550_getc (NS16550_t com_port); 111 int NS16550_tstc (NS16550_t com_port); 112 void NS16550_reinit (NS16550_t com_port, int baud_divisor); 113