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git01.mediatek.com / filogic / uboot / 88fbf93718d3d7d5d07293384bc40734f3b88b0c / . / drivers / serial / ns16550.c
blob: 23c0f76ddea928c205f62f58e09a315468ca8a43 [file] [log] [blame]
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]1/*
2 * COM1 NS16550 support
Stefan Roese88fbf932010-04-15 16:07:28 +0200[diff] [blame^]3 * originally from linux source (arch/powerpc/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>
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]8#include <ns16550.h>
Ladislav Michlcc294422010-02-01 23:34:25 +0100[diff] [blame]9#include <watchdog.h>
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]10
Detlev Zundel166fb542009-04-03 11:53:01 +0200[diff] [blame]11#define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */
12#define UART_MCRVAL (UART_MCR_DTR | \
13 UART_MCR_RTS) /* RTS/DTR */
14#define UART_FCRVAL (UART_FCR_FIFO_EN | \
15 UART_FCR_RXSR | \
16 UART_FCR_TXSR) /* Clear & enable FIFOs */
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]17
18void NS16550_init (NS16550_t com_port, int baud_divisor)
19{
20 com_port->ier = 0x00;
Tom Rix93bed9b2009-05-31 12:44:37 +0200[diff] [blame]21#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
wdenk29e7f5a2004-03-12 00:14:09 +0000[diff] [blame]22 com_port->mdr1 = 0x7; /* mode select reset TL16C750*/
wdenk21136db2003-07-16 21:53:01 +0000[diff] [blame]23#endif
Detlev Zundel166fb542009-04-03 11:53:01 +0200[diff] [blame]24 com_port->lcr = UART_LCR_BKSE | UART_LCRVAL;
Wolfgang Denkfd1569d2007-12-27 10:56:54 +0100[diff] [blame]25 com_port->dll = 0;
26 com_port->dlm = 0;
Detlev Zundel166fb542009-04-03 11:53:01 +0200[diff] [blame]27 com_port->lcr = UART_LCRVAL;
28 com_port->mcr = UART_MCRVAL;
29 com_port->fcr = UART_FCRVAL;
30 com_port->lcr = UART_LCR_BKSE | UART_LCRVAL;
Wolfgang Denkfd1569d2007-12-27 10:56:54 +0100[diff] [blame]31 com_port->dll = baud_divisor & 0xff;
32 com_port->dlm = (baud_divisor >> 8) & 0xff;
Detlev Zundel166fb542009-04-03 11:53:01 +0200[diff] [blame]33 com_port->lcr = UART_LCRVAL;
Tom Rix93bed9b2009-05-31 12:44:37 +0200[diff] [blame]34#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
wdenkf8062712005-01-09 23:16:25 +0000[diff] [blame]35#if defined(CONFIG_APTIX)
36 com_port->mdr1 = 3; /* /13 mode so Aptix 6MHz can hit 115200 */
37#else
38 com_port->mdr1 = 0; /* /16 is proper to hit 115200 with 48MHz */
39#endif
Mike Frysingerd0e97862009-02-11 20:26:52 -0500[diff] [blame]40#endif /* CONFIG_OMAP */
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]41}
42
Ron Madriddfa028a2009-02-18 14:30:44 -0800[diff] [blame]43#ifndef CONFIG_NS16550_MIN_FUNCTIONS
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]44void NS16550_reinit (NS16550_t com_port, int baud_divisor)
45{
46 com_port->ier = 0x00;
Detlev Zundel166fb542009-04-03 11:53:01 +0200[diff] [blame]47 com_port->lcr = UART_LCR_BKSE | UART_LCRVAL;
Wolfgang Denkfd1569d2007-12-27 10:56:54 +0100[diff] [blame]48 com_port->dll = 0;
49 com_port->dlm = 0;
Detlev Zundel166fb542009-04-03 11:53:01 +0200[diff] [blame]50 com_port->lcr = UART_LCRVAL;
51 com_port->mcr = UART_MCRVAL;
52 com_port->fcr = UART_FCRVAL;
53 com_port->lcr = UART_LCR_BKSE;
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]54 com_port->dll = baud_divisor & 0xff;
55 com_port->dlm = (baud_divisor >> 8) & 0xff;
Detlev Zundel166fb542009-04-03 11:53:01 +0200[diff] [blame]56 com_port->lcr = UART_LCRVAL;
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]57}
Ron Madriddfa028a2009-02-18 14:30:44 -0800[diff] [blame]58#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]59
60void NS16550_putc (NS16550_t com_port, char c)
61{
Detlev Zundel166fb542009-04-03 11:53:01 +0200[diff] [blame]62 while ((com_port->lsr & UART_LSR_THRE) == 0);
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]63 com_port->thr = c;
64}
65
Ron Madriddfa028a2009-02-18 14:30:44 -0800[diff] [blame]66#ifndef CONFIG_NS16550_MIN_FUNCTIONS
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]67char NS16550_getc (NS16550_t com_port)
68{
Detlev Zundel166fb542009-04-03 11:53:01 +0200[diff] [blame]69 while ((com_port->lsr & UART_LSR_DR) == 0) {
wdenk29e7f5a2004-03-12 00:14:09 +0000[diff] [blame]70#ifdef CONFIG_USB_TTY
71 extern void usbtty_poll(void);
72 usbtty_poll();
73#endif
Ladislav Michlcc294422010-02-01 23:34:25 +0100[diff] [blame]74 WATCHDOG_RESET();
wdenk29e7f5a2004-03-12 00:14:09 +0000[diff] [blame]75 }
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]76 return (com_port->rbr);
77}
78
79int NS16550_tstc (NS16550_t com_port)
80{
Detlev Zundel166fb542009-04-03 11:53:01 +0200[diff] [blame]81 return ((com_port->lsr & UART_LSR_DR) != 0);
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]82}
83
Ron Madriddfa028a2009-02-18 14:30:44 -0800[diff] [blame]84#endif /* CONFIG_NS16550_MIN_FUNCTIONS */