]>
git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/serial/ns16550.c
3 * originally from linux source (arch/ppc/boot/ns16550.c)
4 * modified to use CONFIG_SYS_ISA_MEM and new defines
10 #define LCRVAL LCR_8N1 /* 8 data, 1 stop, no parity */
11 #define MCRVAL (MCR_DTR | MCR_RTS) /* RTS/DTR */
12 #define FCRVAL (FCR_FIFO_EN | FCR_RXSR | FCR_TXSR) /* Clear & enable FIFOs */
14 void NS16550_init (NS16550_t com_port
, int baud_divisor
)
18 com_port
->mdr1
= 0x7; /* mode select reset TL16C750*/
20 com_port
->lcr
= LCR_BKSE
| LCRVAL
;
23 com_port
->lcr
= LCRVAL
;
24 com_port
->mcr
= MCRVAL
;
25 com_port
->fcr
= FCRVAL
;
26 com_port
->lcr
= LCR_BKSE
| LCRVAL
;
27 com_port
->dll
= baud_divisor
& 0xff;
28 com_port
->dlm
= (baud_divisor
>> 8) & 0xff;
29 com_port
->lcr
= LCRVAL
;
30 #if defined(CONFIG_OMAP)
31 #if defined(CONFIG_APTIX)
32 com_port
->mdr1
= 3; /* /13 mode so Aptix 6MHz can hit 115200 */
34 com_port
->mdr1
= 0; /* /16 is proper to hit 115200 with 48MHz */
36 #endif /* CONFIG_OMAP */
39 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
40 void NS16550_reinit (NS16550_t com_port
, int baud_divisor
)
43 com_port
->lcr
= LCR_BKSE
| LCRVAL
;
46 com_port
->lcr
= LCRVAL
;
47 com_port
->mcr
= MCRVAL
;
48 com_port
->fcr
= FCRVAL
;
49 com_port
->lcr
= LCR_BKSE
;
50 com_port
->dll
= baud_divisor
& 0xff;
51 com_port
->dlm
= (baud_divisor
>> 8) & 0xff;
52 com_port
->lcr
= LCRVAL
;
54 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
56 void NS16550_putc (NS16550_t com_port
, char c
)
58 while ((com_port
->lsr
& LSR_THRE
) == 0);
62 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
63 char NS16550_getc (NS16550_t com_port
)
65 while ((com_port
->lsr
& LSR_DR
) == 0) {
67 extern void usbtty_poll(void);
71 return (com_port
->rbr
);
74 int NS16550_tstc (NS16550_t com_port
)
76 return ((com_port
->lsr
& LSR_DR
) != 0);
79 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */