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wdenke85390d2002-04-01 14:29:03 +00001/*
2 * COM1 NS16550 support
Stefan Roesea47a12b2010-04-15 16:07:28 +02003 * originally from linux source (arch/powerpc/boot/ns16550.c)
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004 * modified to use CONFIG_SYS_ISA_MEM and new defines
wdenke85390d2002-04-01 14:29:03 +00005 */
6
7#include <config.h>
wdenke85390d2002-04-01 14:29:03 +00008#include <ns16550.h>
Ladislav Michla1b322a2010-02-01 23:34:25 +01009#include <watchdog.h>
Graeme Russ167cdad2010-04-24 00:05:46 +100010#include <linux/types.h>
11#include <asm/io.h>
wdenke85390d2002-04-01 14:29:03 +000012
Detlev Zundel200779e2009-04-03 11:53:01 +020013#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 +100019#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
20#define serial_out(x,y) outb(x,(ulong)y)
21#define serial_in(y) inb((ulong)y)
22#else
23#define serial_out(x,y) writeb(x,y)
24#define serial_in(y) readb(y)
25#endif
wdenke85390d2002-04-01 14:29:03 +000026
27void NS16550_init (NS16550_t com_port, int baud_divisor)
28{
Graeme Russ167cdad2010-04-24 00:05:46 +100029 serial_out(0x00, &com_port->ier);
Tom Rix660888b2009-05-31 12:44:37 +020030#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
Graeme Russ167cdad2010-04-24 00:05:46 +100031 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
wdenk945af8d2003-07-16 21:53:01 +000032#endif
Graeme Russ167cdad2010-04-24 00:05:46 +100033 serial_out(UART_LCR_BKSE | UART_LCRVAL, (ulong)&com_port->lcr);
34 serial_out(0, &com_port->dll);
35 serial_out(0, &com_port->dlm);
36 serial_out(UART_LCRVAL, &com_port->lcr);
37 serial_out(UART_MCRVAL, &com_port->mcr);
38 serial_out(UART_FCRVAL, &com_port->fcr);
39 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
40 serial_out(baud_divisor & 0xff, &com_port->dll);
41 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
42 serial_out(UART_LCRVAL, &com_port->lcr);
Tom Rix660888b2009-05-31 12:44:37 +020043#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
wdenk8ed96042005-01-09 23:16:25 +000044#if defined(CONFIG_APTIX)
Graeme Russ167cdad2010-04-24 00:05:46 +100045 serial_out(3, &com_port->mdr1); /* /13 mode so Aptix 6MHz can hit 115200 */
wdenk8ed96042005-01-09 23:16:25 +000046#else
Graeme Russ167cdad2010-04-24 00:05:46 +100047 serial_out(0, &com_port->mdr1); /* /16 is proper to hit 115200 with 48MHz */
wdenk8ed96042005-01-09 23:16:25 +000048#endif
Mike Frysingerb4746d82009-02-11 20:26:52 -050049#endif /* CONFIG_OMAP */
wdenke85390d2002-04-01 14:29:03 +000050}
51
Ron Madridf5675aa2009-02-18 14:30:44 -080052#ifndef CONFIG_NS16550_MIN_FUNCTIONS
wdenke85390d2002-04-01 14:29:03 +000053void NS16550_reinit (NS16550_t com_port, int baud_divisor)
54{
Graeme Russ167cdad2010-04-24 00:05:46 +100055 serial_out(0x00, &com_port->ier);
56 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
57 serial_out(0, &com_port->dll);
58 serial_out(0, &com_port->dlm);
59 serial_out(UART_LCRVAL, &com_port->lcr);
60 serial_out(UART_MCRVAL, &com_port->mcr);
61 serial_out(UART_FCRVAL, &com_port->fcr);
62 serial_out(UART_LCR_BKSE, &com_port->lcr);
63 serial_out(baud_divisor & 0xff, &com_port->dll);
64 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
65 serial_out(UART_LCRVAL, &com_port->lcr);
wdenke85390d2002-04-01 14:29:03 +000066}
Ron Madridf5675aa2009-02-18 14:30:44 -080067#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
wdenke85390d2002-04-01 14:29:03 +000068
69void NS16550_putc (NS16550_t com_port, char c)
70{
Graeme Russ167cdad2010-04-24 00:05:46 +100071 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0);
72 serial_out(c, &com_port->thr);
wdenke85390d2002-04-01 14:29:03 +000073}
74
Ron Madridf5675aa2009-02-18 14:30:44 -080075#ifndef CONFIG_NS16550_MIN_FUNCTIONS
wdenke85390d2002-04-01 14:29:03 +000076char NS16550_getc (NS16550_t com_port)
77{
Graeme Russ167cdad2010-04-24 00:05:46 +100078 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
wdenk232c1502004-03-12 00:14:09 +000079#ifdef CONFIG_USB_TTY
80 extern void usbtty_poll(void);
81 usbtty_poll();
82#endif
Ladislav Michla1b322a2010-02-01 23:34:25 +010083 WATCHDOG_RESET();
wdenk232c1502004-03-12 00:14:09 +000084 }
Graeme Russ167cdad2010-04-24 00:05:46 +100085 return serial_in(&com_port->rbr);
wdenke85390d2002-04-01 14:29:03 +000086}
87
88int NS16550_tstc (NS16550_t com_port)
89{
Graeme Russ167cdad2010-04-24 00:05:46 +100090 return ((serial_in(&com_port->lsr) & UART_LSR_DR) != 0);
wdenke85390d2002-04-01 14:29:03 +000091}
92
Ron Madridf5675aa2009-02-18 14:30:44 -080093#endif /* CONFIG_NS16550_MIN_FUNCTIONS */