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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / f8df9d0d1a1f668cfb37c02fa42e5fa10e0eec0f / . / drivers / serial / ns16550.c
blob: 056c25d58f246d7247d353b14a71dbb50872a22a [file] [log] [blame]
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]1/*
2 * COM1 NS16550 support
Stefan Roesea47a12b2010-04-15 16:07:28 +0200[diff] [blame]3 * originally from linux source (arch/powerpc/boot/ns16550.c)
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 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 Michla1b322a2010-02-01 23:34:25 +0100[diff] [blame]9#include <watchdog.h>
Graeme Russ167cdad2010-04-24 00:05:46 +1000[diff] [blame]10#include <linux/types.h>
11#include <asm/io.h>
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]12
Detlev Zundel200779e2009-04-03 11:53:01 +0200[diff] [blame]13#define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */
14#define UART_MCRVAL (UART_MCR_DTR | \
15 UART_MCR_RTS) /* RTS/DTR */
16#define UART_FCRVAL (UART_FCR_FIFO_EN | \
17 UART_FCR_RXSR | \
18 UART_FCR_TXSR) /* Clear & enable FIFOs */
Graeme Russ167cdad2010-04-24 00:05:46 +1000[diff] [blame]19#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
Simon Glassf8df9d02011-10-15 19:14:09 +0000[diff] [blame^]20#define serial_out(x, y) outb(x, (ulong)y)
21#define serial_in(y) inb((ulong)y)
Dave Aldridge79df1202011-09-01 22:47:14 +0000[diff] [blame]22#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE > 0)
Simon Glassf8df9d02011-10-15 19:14:09 +0000[diff] [blame^]23#define serial_out(x, y) out_be32(y, x)
24#define serial_in(y) in_be32(y)
Dave Aldridge79df1202011-09-01 22:47:14 +0000[diff] [blame]25#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE < 0)
Simon Glassf8df9d02011-10-15 19:14:09 +0000[diff] [blame^]26#define serial_out(x, y) out_le32(y, x)
27#define serial_in(y) in_le32(y)
Graeme Russ167cdad2010-04-24 00:05:46 +1000[diff] [blame]28#else
Simon Glassf8df9d02011-10-15 19:14:09 +0000[diff] [blame^]29#define serial_out(x, y) writeb(x, y)
30#define serial_in(y) readb(y)
Graeme Russ167cdad2010-04-24 00:05:46 +1000[diff] [blame]31#endif
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]32
Prafulla Wadaskara160ea02010-10-27 21:58:31 +0530[diff] [blame]33#ifndef CONFIG_SYS_NS16550_IER
34#define CONFIG_SYS_NS16550_IER 0x00
35#endif /* CONFIG_SYS_NS16550_IER */
36
Simon Glassf8df9d02011-10-15 19:14:09 +0000[diff] [blame^]37void NS16550_init(NS16550_t com_port, int baud_divisor)
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]38{
Prafulla Wadaskara160ea02010-10-27 21:58:31 +0530[diff] [blame]39 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
Tom Rix660888b2009-05-31 12:44:37 +0200[diff] [blame]40#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
Graeme Russ167cdad2010-04-24 00:05:46 +1000[diff] [blame]41 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
wdenk945af8d2003-07-16 21:53:01 +0000[diff] [blame]42#endif
Graeme Russ167cdad2010-04-24 00:05:46 +1000[diff] [blame]43 serial_out(UART_LCR_BKSE | UART_LCRVAL, (ulong)&com_port->lcr);
44 serial_out(0, &com_port->dll);
45 serial_out(0, &com_port->dlm);
46 serial_out(UART_LCRVAL, &com_port->lcr);
47 serial_out(UART_MCRVAL, &com_port->mcr);
48 serial_out(UART_FCRVAL, &com_port->fcr);
49 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
50 serial_out(baud_divisor & 0xff, &com_port->dll);
51 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
52 serial_out(UART_LCRVAL, &com_port->lcr);
Tom Rix660888b2009-05-31 12:44:37 +0200[diff] [blame]53#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
wdenk8ed96042005-01-09 23:16:25 +0000[diff] [blame]54#if defined(CONFIG_APTIX)
Simon Glassf8df9d02011-10-15 19:14:09 +0000[diff] [blame^]55 /* /13 mode so Aptix 6MHz can hit 115200 */
56 serial_out(3, &com_port->mdr1);
wdenk8ed96042005-01-09 23:16:25 +0000[diff] [blame]57#else
Simon Glassf8df9d02011-10-15 19:14:09 +0000[diff] [blame^]58 /* /16 is proper to hit 115200 with 48MHz */
59 serial_out(0, &com_port->mdr1);
wdenk8ed96042005-01-09 23:16:25 +0000[diff] [blame]60#endif
Mike Frysingerb4746d82009-02-11 20:26:52 -0500[diff] [blame]61#endif /* CONFIG_OMAP */
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]62}
63
Ron Madridf5675aa2009-02-18 14:30:44 -0800[diff] [blame]64#ifndef CONFIG_NS16550_MIN_FUNCTIONS
Simon Glassf8df9d02011-10-15 19:14:09 +0000[diff] [blame^]65void NS16550_reinit(NS16550_t com_port, int baud_divisor)
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]66{
Prafulla Wadaskara160ea02010-10-27 21:58:31 +0530[diff] [blame]67 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
Graeme Russ167cdad2010-04-24 00:05:46 +1000[diff] [blame]68 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
69 serial_out(0, &com_port->dll);
70 serial_out(0, &com_port->dlm);
71 serial_out(UART_LCRVAL, &com_port->lcr);
72 serial_out(UART_MCRVAL, &com_port->mcr);
73 serial_out(UART_FCRVAL, &com_port->fcr);
74 serial_out(UART_LCR_BKSE, &com_port->lcr);
75 serial_out(baud_divisor & 0xff, &com_port->dll);
76 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
77 serial_out(UART_LCRVAL, &com_port->lcr);
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]78}
Ron Madridf5675aa2009-02-18 14:30:44 -0800[diff] [blame]79#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]80
Simon Glassf8df9d02011-10-15 19:14:09 +0000[diff] [blame^]81void NS16550_putc(NS16550_t com_port, char c)
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]82{
Simon Glassf8df9d02011-10-15 19:14:09 +0000[diff] [blame^]83 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0)
84 ;
Graeme Russ167cdad2010-04-24 00:05:46 +1000[diff] [blame]85 serial_out(c, &com_port->thr);
Stefan Roese1a2d9b32010-10-12 09:39:45 +0200[diff] [blame]86
87 /*
88 * Call watchdog_reset() upon newline. This is done here in putc
89 * since the environment code uses a single puts() to print the complete
90 * environment upon "printenv". So we can't put this watchdog call
91 * in puts().
92 */
93 if (c == '\n')
94 WATCHDOG_RESET();
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]95}
96
Ron Madridf5675aa2009-02-18 14:30:44 -0800[diff] [blame]97#ifndef CONFIG_NS16550_MIN_FUNCTIONS
Simon Glassf8df9d02011-10-15 19:14:09 +0000[diff] [blame^]98char NS16550_getc(NS16550_t com_port)
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]99{
Graeme Russ167cdad2010-04-24 00:05:46 +1000[diff] [blame]100 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
wdenk232c1502004-03-12 00:14:09 +0000[diff] [blame]101#ifdef CONFIG_USB_TTY
102 extern void usbtty_poll(void);
103 usbtty_poll();
104#endif
Ladislav Michla1b322a2010-02-01 23:34:25 +0100[diff] [blame]105 WATCHDOG_RESET();
wdenk232c1502004-03-12 00:14:09 +0000[diff] [blame]106 }
Graeme Russ167cdad2010-04-24 00:05:46 +1000[diff] [blame]107 return serial_in(&com_port->rbr);
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]108}
109
Simon Glassf8df9d02011-10-15 19:14:09 +0000[diff] [blame^]110int NS16550_tstc(NS16550_t com_port)
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]111{
Simon Glassf8df9d02011-10-15 19:14:09 +0000[diff] [blame^]112 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0;
wdenke85390d2002-04-01 14:29:03 +0000[diff] [blame]113}
114
Ron Madridf5675aa2009-02-18 14:30:44 -0800[diff] [blame]115#endif /* CONFIG_NS16550_MIN_FUNCTIONS */