3 * originally from linux source (arch/ppc/boot/ns16550.h)
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.
12 #if (CFG_NS16550_REG_SIZE == 1)
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)
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)
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)
47 unsigned char rbr; /* 0 */
49 unsigned char ier; /* 1 */
51 unsigned char fcr; /* 2 */
53 unsigned char lcr; /* 3 */
55 unsigned char mcr; /* 4 */
57 unsigned char lsr; /* 5 */
59 unsigned char msr; /* 6 */
61 unsigned char scr; /* 7 */
63 } __attribute__ ((packed));
65 #error "Please define NS16550 registers size."
73 typedef volatile struct NS16550 *NS16550_t;
75 #define FCR_FIFO_EN 0x01 /* Fifo enable */
76 #define FCR_RXSR 0x02 /* Receiver soft reset */
77 #define FCR_TXSR 0x04 /* Transmitter soft reset */
81 #define MCR_DMA_EN 0x04
82 #define MCR_TX_DFR 0x08
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 */
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 */
105 /* useful defaults for LCR */
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);