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Commit | Line | Data |
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71fc6c55 WD |
1 | /* |
2 | * COM1 NS16550 support | |
3 | * originally from linux source (arch/ppc/boot/ns16550.c) | |
6d0f6bcf | 4 | * modified to use CONFIG_SYS_ISA_MEM and new defines |
71fc6c55 WD |
5 | */ |
6 | ||
7 | #include <config.h> | |
8 | #include "ns16550.h" | |
9 | ||
10 | typedef struct NS16550 *NS16550_t; | |
11 | ||
bf9e3b38 | 12 | const NS16550_t COM_PORTS[] = |
6d0f6bcf JCPV |
13 | { (NS16550_t) ((CONFIG_SYS_EUMB_ADDR) + 0x4500), |
14 | (NS16550_t) ((CONFIG_SYS_EUMB_ADDR) + 0x4600) }; | |
71fc6c55 | 15 | |
bf9e3b38 | 16 | volatile struct NS16550 *NS16550_init (int chan, int baud_divisor) |
71fc6c55 | 17 | { |
bf9e3b38 WD |
18 | volatile struct NS16550 *com_port; |
19 | ||
20 | com_port = (struct NS16550 *) COM_PORTS[chan]; | |
21 | com_port->ier = 0x00; | |
22 | com_port->lcr = LCR_BKSE; /* Access baud rate */ | |
23 | com_port->dll = baud_divisor & 0xff; /* 9600 baud */ | |
24 | com_port->dlm = (baud_divisor >> 8) & 0xff; | |
25 | com_port->lcr = LCR_8N1; /* 8 data, 1 stop, no parity */ | |
26 | com_port->mcr = MCR_RTS; /* RTS/DTR */ | |
27 | com_port->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR; /* Clear & enable FIFOs */ | |
28 | return (com_port); | |
71fc6c55 WD |
29 | } |
30 | ||
bf9e3b38 | 31 | void NS16550_reinit (volatile struct NS16550 *com_port, int baud_divisor) |
71fc6c55 | 32 | { |
bf9e3b38 WD |
33 | com_port->ier = 0x00; |
34 | com_port->lcr = LCR_BKSE; /* Access baud rate */ | |
35 | com_port->dll = baud_divisor & 0xff; /* 9600 baud */ | |
36 | com_port->dlm = (baud_divisor >> 8) & 0xff; | |
37 | com_port->lcr = LCR_8N1; /* 8 data, 1 stop, no parity */ | |
38 | com_port->mcr = MCR_RTS; /* RTS/DTR */ | |
39 | com_port->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR; /* Clear & enable FIFOs */ | |
71fc6c55 WD |
40 | } |
41 | ||
bf9e3b38 | 42 | void NS16550_putc (volatile struct NS16550 *com_port, unsigned char c) |
71fc6c55 | 43 | { |
bf9e3b38 WD |
44 | while ((com_port->lsr & LSR_THRE) == 0); |
45 | com_port->thr = c; | |
71fc6c55 WD |
46 | } |
47 | ||
bf9e3b38 | 48 | unsigned char NS16550_getc (volatile struct NS16550 *com_port) |
71fc6c55 | 49 | { |
bf9e3b38 WD |
50 | while ((com_port->lsr & LSR_DR) == 0); |
51 | return (com_port->rbr); | |
71fc6c55 WD |
52 | } |
53 | ||
bf9e3b38 | 54 | int NS16550_tstc (volatile struct NS16550 *com_port) |
71fc6c55 | 55 | { |
bf9e3b38 | 56 | return ((com_port->lsr & LSR_DR) != 0); |
71fc6c55 | 57 | } |