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git01.mediatek.com / filogic / uboot / dfa028a0d062dcc78c29d57e53fa3293783086fc / . / drivers / serial / ns16550.c
blob: 1b347e91ad004a13c0434cf061265b3fbfa00d57 [file] [log] [blame]
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]1/*
2 * COM1 NS16550 support
3 * originally from linux source (arch/ppc/boot/ns16550.c)
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +0200[diff] [blame]4 * modified to use CONFIG_SYS_ISA_MEM and new defines
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]5 */
6
7#include <config.h>
8
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +0200[diff] [blame]9#ifdef CONFIG_SYS_NS16550
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]10
11#include <ns16550.h>
12
13#define LCRVAL LCR_8N1 /* 8 data, 1 stop, no parity */
14#define MCRVAL (MCR_DTR | MCR_RTS) /* RTS/DTR */
15#define FCRVAL (FCR_FIFO_EN | FCR_RXSR | FCR_TXSR) /* Clear & enable FIFOs */
16
17void NS16550_init (NS16550_t com_port, int baud_divisor)
18{
19 com_port->ier = 0x00;
wdenkf8062712005-01-09 23:16:25 +0000[diff] [blame]20#ifdef CONFIG_OMAP
wdenk29e7f5a2004-03-12 00:14:09 +0000[diff] [blame]21 com_port->mdr1 = 0x7; /* mode select reset TL16C750*/
wdenk21136db2003-07-16 21:53:01 +0000[diff] [blame]22#endif
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]23 com_port->lcr = LCR_BKSE | LCRVAL;
Wolfgang Denkfd1569d2007-12-27 10:56:54 +0100[diff] [blame]24 com_port->dll = 0;
25 com_port->dlm = 0;
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]26 com_port->lcr = LCRVAL;
27 com_port->mcr = MCRVAL;
28 com_port->fcr = FCRVAL;
Wolfgang Denkfd1569d2007-12-27 10:56:54 +0100[diff] [blame]29 com_port->lcr = LCR_BKSE | LCRVAL;
30 com_port->dll = baud_divisor & 0xff;
31 com_port->dlm = (baud_divisor >> 8) & 0xff;
32 com_port->lcr = LCRVAL;
wdenkf8062712005-01-09 23:16:25 +0000[diff] [blame]33#if defined(CONFIG_OMAP)
34#if defined(CONFIG_APTIX)
35 com_port->mdr1 = 3; /* /13 mode so Aptix 6MHz can hit 115200 */
36#else
37 com_port->mdr1 = 0; /* /16 is proper to hit 115200 with 48MHz */
38#endif
wdenkf6f96f72003-07-15 20:04:06 +0000[diff] [blame]39#endif
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]40}
41
Ron Madriddfa028a2009-02-18 14:30:44 -0800[diff] [blame^]42#ifndef CONFIG_NS16550_MIN_FUNCTIONS
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]43void NS16550_reinit (NS16550_t com_port, int baud_divisor)
44{
45 com_port->ier = 0x00;
Wolfgang Denkfd1569d2007-12-27 10:56:54 +0100[diff] [blame]46 com_port->lcr = LCR_BKSE | LCRVAL;
47 com_port->dll = 0;
48 com_port->dlm = 0;
49 com_port->lcr = LCRVAL;
50 com_port->mcr = MCRVAL;
51 com_port->fcr = FCRVAL;
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]52 com_port->lcr = LCR_BKSE;
53 com_port->dll = baud_divisor & 0xff;
54 com_port->dlm = (baud_divisor >> 8) & 0xff;
55 com_port->lcr = LCRVAL;
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]56}
Ron Madriddfa028a2009-02-18 14:30:44 -0800[diff] [blame^]57#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]58
59void NS16550_putc (NS16550_t com_port, char c)
60{
61 while ((com_port->lsr & LSR_THRE) == 0);
62 com_port->thr = c;
63}
64
Ron Madriddfa028a2009-02-18 14:30:44 -0800[diff] [blame^]65#ifndef CONFIG_NS16550_MIN_FUNCTIONS
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]66char NS16550_getc (NS16550_t com_port)
67{
wdenk29e7f5a2004-03-12 00:14:09 +0000[diff] [blame]68 while ((com_port->lsr & LSR_DR) == 0) {
69#ifdef CONFIG_USB_TTY
70 extern void usbtty_poll(void);
71 usbtty_poll();
72#endif
73 }
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]74 return (com_port->rbr);
75}
76
77int NS16550_tstc (NS16550_t com_port)
78{
79 return ((com_port->lsr & LSR_DR) != 0);
80}
81
Ron Madriddfa028a2009-02-18 14:30:44 -0800[diff] [blame^]82#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]83#endif