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wdenke85390d2002-04-01 14:29:03 +00001/*
2 * COM1 NS16550 support
Stefan Roese88fbf932010-04-15 16:07:28 +02003 * originally from linux source (arch/powerpc/boot/ns16550.c)
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 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 Michlcc294422010-02-01 23:34:25 +01009#include <watchdog.h>
Graeme Russ14f06e62010-04-24 00:05:46 +100010#include <linux/types.h>
11#include <asm/io.h>
wdenke85390d2002-04-01 14:29:03 +000012
Detlev Zundel166fb542009-04-03 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 Russ14f06e62010-04-24 00:05:46 +100019#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
Simon Glassdd5497c2011-10-15 19:14:09 +000020#define serial_out(x, y) outb(x, (ulong)y)
21#define serial_in(y) inb((ulong)y)
Dave Aldridgea51bebc2011-09-01 22:47:14 +000022#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE > 0)
Simon Glassdd5497c2011-10-15 19:14:09 +000023#define serial_out(x, y) out_be32(y, x)
24#define serial_in(y) in_be32(y)
Dave Aldridgea51bebc2011-09-01 22:47:14 +000025#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE < 0)
Simon Glassdd5497c2011-10-15 19:14:09 +000026#define serial_out(x, y) out_le32(y, x)
27#define serial_in(y) in_le32(y)
Graeme Russ14f06e62010-04-24 00:05:46 +100028#else
Simon Glassdd5497c2011-10-15 19:14:09 +000029#define serial_out(x, y) writeb(x, y)
30#define serial_in(y) readb(y)
Graeme Russ14f06e62010-04-24 00:05:46 +100031#endif
wdenke85390d2002-04-01 14:29:03 +000032
Prafulla Wadaskar66216372010-10-27 21:58:31 +053033#ifndef CONFIG_SYS_NS16550_IER
34#define CONFIG_SYS_NS16550_IER 0x00
35#endif /* CONFIG_SYS_NS16550_IER */
36
Simon Glassdd5497c2011-10-15 19:14:09 +000037void NS16550_init(NS16550_t com_port, int baud_divisor)
wdenke85390d2002-04-01 14:29:03 +000038{
Manfred Huberf9b8ae32013-03-29 02:52:36 +000039#if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_OMAP34XX))
40 /*
41 * On some OMAP3 devices when UART3 is configured for boot mode before
42 * SPL starts only THRE bit is set. We have to empty the transmitter
43 * before initialization starts.
44 */
45 if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE))
46 == UART_LSR_THRE) {
47 serial_out(UART_LCR_DLAB, &com_port->lcr);
48 serial_out(baud_divisor & 0xff, &com_port->dll);
49 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
50 serial_out(UART_LCRVAL, &com_port->lcr);
51 serial_out(0, &com_port->mdr1);
52 }
53#endif
54
Scott Wood6c6f0612012-09-18 18:19:05 -050055 while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT))
56 ;
57
Prafulla Wadaskar66216372010-10-27 21:58:31 +053058 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
Tom Rinifc695e32013-12-20 11:19:33 -050059#if defined(CONFIG_OMAP) || defined(CONFIG_AM33XX) || \
60 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
Graeme Russ14f06e62010-04-24 00:05:46 +100061 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
wdenk21136db2003-07-16 21:53:01 +000062#endif
Simon Glass19bc5012013-03-05 14:40:02 +000063 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
Graeme Russ14f06e62010-04-24 00:05:46 +100064 serial_out(0, &com_port->dll);
65 serial_out(0, &com_port->dlm);
66 serial_out(UART_LCRVAL, &com_port->lcr);
67 serial_out(UART_MCRVAL, &com_port->mcr);
68 serial_out(UART_FCRVAL, &com_port->fcr);
69 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
70 serial_out(baud_divisor & 0xff, &com_port->dll);
71 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
72 serial_out(UART_LCRVAL, &com_port->lcr);
Chandan Nath7d744102011-10-14 02:58:26 +000073#if (defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)) || \
Matt Porter7967b1a2013-03-15 10:07:09 +000074 defined(CONFIG_AM33XX) || defined(CONFIG_SOC_DA8XX) || \
TENART Antoinea6be77c2013-07-02 12:05:58 +020075 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
Chandan Nath7d744102011-10-14 02:58:26 +000076
Simon Glassdd5497c2011-10-15 19:14:09 +000077 /* /16 is proper to hit 115200 with 48MHz */
78 serial_out(0, &com_port->mdr1);
Mike Frysingerd0e97862009-02-11 20:26:52 -050079#endif /* CONFIG_OMAP */
wdenke85390d2002-04-01 14:29:03 +000080}
81
Ron Madriddfa028a2009-02-18 14:30:44 -080082#ifndef CONFIG_NS16550_MIN_FUNCTIONS
Simon Glassdd5497c2011-10-15 19:14:09 +000083void NS16550_reinit(NS16550_t com_port, int baud_divisor)
wdenke85390d2002-04-01 14:29:03 +000084{
Prafulla Wadaskar66216372010-10-27 21:58:31 +053085 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
Graeme Russ14f06e62010-04-24 00:05:46 +100086 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
87 serial_out(0, &com_port->dll);
88 serial_out(0, &com_port->dlm);
89 serial_out(UART_LCRVAL, &com_port->lcr);
90 serial_out(UART_MCRVAL, &com_port->mcr);
91 serial_out(UART_FCRVAL, &com_port->fcr);
92 serial_out(UART_LCR_BKSE, &com_port->lcr);
93 serial_out(baud_divisor & 0xff, &com_port->dll);
94 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
95 serial_out(UART_LCRVAL, &com_port->lcr);
wdenke85390d2002-04-01 14:29:03 +000096}
Ron Madriddfa028a2009-02-18 14:30:44 -080097#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
wdenke85390d2002-04-01 14:29:03 +000098
Simon Glassdd5497c2011-10-15 19:14:09 +000099void NS16550_putc(NS16550_t com_port, char c)
wdenke85390d2002-04-01 14:29:03 +0000100{
Simon Glassdd5497c2011-10-15 19:14:09 +0000101 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0)
102 ;
Graeme Russ14f06e62010-04-24 00:05:46 +1000103 serial_out(c, &com_port->thr);
Stefan Roese57b99882010-10-12 09:39:45 +0200104
105 /*
106 * Call watchdog_reset() upon newline. This is done here in putc
107 * since the environment code uses a single puts() to print the complete
108 * environment upon "printenv". So we can't put this watchdog call
109 * in puts().
110 */
111 if (c == '\n')
112 WATCHDOG_RESET();
wdenke85390d2002-04-01 14:29:03 +0000113}
114
Ron Madriddfa028a2009-02-18 14:30:44 -0800115#ifndef CONFIG_NS16550_MIN_FUNCTIONS
Simon Glassdd5497c2011-10-15 19:14:09 +0000116char NS16550_getc(NS16550_t com_port)
wdenke85390d2002-04-01 14:29:03 +0000117{
Graeme Russ14f06e62010-04-24 00:05:46 +1000118 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
Marek Vasut9e1fca92012-09-15 10:25:19 +0200119#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY)
wdenk29e7f5a2004-03-12 00:14:09 +0000120 extern void usbtty_poll(void);
121 usbtty_poll();
122#endif
Ladislav Michlcc294422010-02-01 23:34:25 +0100123 WATCHDOG_RESET();
wdenk29e7f5a2004-03-12 00:14:09 +0000124 }
Graeme Russ14f06e62010-04-24 00:05:46 +1000125 return serial_in(&com_port->rbr);
wdenke85390d2002-04-01 14:29:03 +0000126}
127
Simon Glassdd5497c2011-10-15 19:14:09 +0000128int NS16550_tstc(NS16550_t com_port)
wdenke85390d2002-04-01 14:29:03 +0000129{
Simon Glassdd5497c2011-10-15 19:14:09 +0000130 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0;
wdenke85390d2002-04-01 14:29:03 +0000131}
132
Ron Madriddfa028a2009-02-18 14:30:44 -0800133#endif /* CONFIG_NS16550_MIN_FUNCTIONS */