[people/ms/u-boot.git] / drivers / serial / ns16550.c

/*
 * COM1 NS16550 support
 * originally from linux source (arch/powerpc/boot/ns16550.c)
 * modified to use CONFIG_SYS_ISA_MEM and new defines
 */

#include <config.h>
#include <ns16550.h>
#include <watchdog.h>
#include <linux/types.h>
#include <asm/io.h>

#define UART_LCRVAL UART_LCR_8N1		/* 8 data, 1 stop, no parity */
#define UART_MCRVAL (UART_MCR_DTR | \
		     UART_MCR_RTS)		/* RTS/DTR */
#define UART_FCRVAL (UART_FCR_FIFO_EN |	\
		     UART_FCR_RXSR |	\
		     UART_FCR_TXSR)		/* Clear & enable FIFOs */
#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
#define serial_out(x,y)	outb(x,(ulong)y)
#define serial_in(y)	inb((ulong)y)
#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE > 0)
#define serial_out(x,y) out_be32(y,x)
#define serial_in(y) 	in_be32(y)
#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE < 0)
#define serial_out(x,y) out_le32(y,x)
#define serial_in(y) 	in_le32(y)
#else
#define serial_out(x,y) writeb(x,y)
#define serial_in(y) 	readb(y)
#endif

#ifndef CONFIG_SYS_NS16550_IER
#define CONFIG_SYS_NS16550_IER  0x00
#endif /* CONFIG_SYS_NS16550_IER */

void NS16550_init (NS16550_t com_port, int baud_divisor)
{
	serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
	serial_out(0x7, &com_port->mdr1);	/* mode select reset TL16C750*/
#endif
	serial_out(UART_LCR_BKSE | UART_LCRVAL, (ulong)&com_port->lcr);
	serial_out(0, &com_port->dll);
	serial_out(0, &com_port->dlm);
	serial_out(UART_LCRVAL, &com_port->lcr);
	serial_out(UART_MCRVAL, &com_port->mcr);
	serial_out(UART_FCRVAL, &com_port->fcr);
	serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
	serial_out(baud_divisor & 0xff, &com_port->dll);
	serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
	serial_out(UART_LCRVAL, &com_port->lcr);
#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
#if defined(CONFIG_APTIX)
	serial_out(3, &com_port->mdr1);	/* /13 mode so Aptix 6MHz can hit 115200 */
#else
	serial_out(0, &com_port->mdr1);	/* /16 is proper to hit 115200 with 48MHz */
#endif
#endif /* CONFIG_OMAP */
}

#ifndef CONFIG_NS16550_MIN_FUNCTIONS
void NS16550_reinit (NS16550_t com_port, int baud_divisor)
{
	serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
	serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
	serial_out(0, &com_port->dll);
	serial_out(0, &com_port->dlm);
	serial_out(UART_LCRVAL, &com_port->lcr);
	serial_out(UART_MCRVAL, &com_port->mcr);
	serial_out(UART_FCRVAL, &com_port->fcr);
	serial_out(UART_LCR_BKSE, &com_port->lcr);
	serial_out(baud_divisor & 0xff, &com_port->dll);
	serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
	serial_out(UART_LCRVAL, &com_port->lcr);
}
#endif /* CONFIG_NS16550_MIN_FUNCTIONS */

void NS16550_putc (NS16550_t com_port, char c)
{
	while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0);
	serial_out(c, &com_port->thr);

	/*
	 * Call watchdog_reset() upon newline. This is done here in putc
	 * since the environment code uses a single puts() to print the complete
	 * environment upon "printenv". So we can't put this watchdog call
	 * in puts().
	 */
	if (c == '\n')
		WATCHDOG_RESET();
}

#ifndef CONFIG_NS16550_MIN_FUNCTIONS
char NS16550_getc (NS16550_t com_port)
{
	while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
#ifdef CONFIG_USB_TTY
		extern void usbtty_poll(void);
		usbtty_poll();
#endif
		WATCHDOG_RESET();
	}
	return serial_in(&com_port->rbr);
}

int NS16550_tstc (NS16550_t com_port)
{
	return ((serial_in(&com_port->lsr) & UART_LSR_DR) != 0);
}

#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
Commit	Line	Data
e85390dc WD	1	/*
e85390dc WD	2	* COM1 NS16550 support
a47a12be	3	* originally from linux source (arch/powerpc/boot/ns16550.c)
6d0f6bcf	4	* modified to use CONFIG_SYS_ISA_MEM and new defines
e85390dc WD	5	*/
	6
	7	#include <config.h>
e85390dc	8	#include <ns16550.h>
a1b322a9	9	#include <watchdog.h>
167cdad1 GR	10	#include <linux/types.h>
167cdad1 GR	11	#include <asm/io.h>
e85390dc	12
200779e3 DZ	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 */
167cdad1 GR	19	#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
	20	#define serial_out(x,y) outb(x,(ulong)y)
	21	#define serial_in(y) inb((ulong)y)
79df1208 DA	22	#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE > 0)
	23	#define serial_out(x,y) out_be32(y,x)
	24	#define serial_in(y) in_be32(y)
	25	#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE < 0)
	26	#define serial_out(x,y) out_le32(y,x)
	27	#define serial_in(y) in_le32(y)
167cdad1 GR	28	#else
	29	#define serial_out(x,y) writeb(x,y)
	30	#define serial_in(y) readb(y)
	31	#endif
e85390dc	32
a160ea0b PW	33	#ifndef CONFIG_SYS_NS16550_IER
	34	#define CONFIG_SYS_NS16550_IER 0x00
	35	#endif /* CONFIG_SYS_NS16550_IER */
	36
e85390dc WD	37	void NS16550_init (NS16550_t com_port, int baud_divisor)
e85390dc WD	38	{
a160ea0b	39	serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
660888b7	40	#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
167cdad1	41	serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
945af8d7	42	#endif
167cdad1 GR	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);
660888b7	53	#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
8ed96046	54	#if defined(CONFIG_APTIX)
167cdad1	55	serial_out(3, &com_port->mdr1); /* /13 mode so Aptix 6MHz can hit 115200 */
8ed96046	56	#else
167cdad1	57	serial_out(0, &com_port->mdr1); /* /16 is proper to hit 115200 with 48MHz */
8ed96046	58	#endif
b4746d8b	59	#endif /* CONFIG_OMAP */
e85390dc WD	60	}
e85390dc WD	61
f5675aa5	62	#ifndef CONFIG_NS16550_MIN_FUNCTIONS
e85390dc WD	63	void NS16550_reinit (NS16550_t com_port, int baud_divisor)
e85390dc WD	64	{
a160ea0b	65	serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
167cdad1 GR	66	serial_out(UART_LCR_BKSE \| UART_LCRVAL, &com_port->lcr);
	67	serial_out(0, &com_port->dll);
	68	serial_out(0, &com_port->dlm);
	69	serial_out(UART_LCRVAL, &com_port->lcr);
	70	serial_out(UART_MCRVAL, &com_port->mcr);
	71	serial_out(UART_FCRVAL, &com_port->fcr);
	72	serial_out(UART_LCR_BKSE, &com_port->lcr);
	73	serial_out(baud_divisor & 0xff, &com_port->dll);
	74	serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
	75	serial_out(UART_LCRVAL, &com_port->lcr);
e85390dc	76	}
f5675aa5	77	#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
e85390dc WD	78
	79	void NS16550_putc (NS16550_t com_port, char c)
	80	{
167cdad1 GR	81	while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0);
167cdad1 GR	82	serial_out(c, &com_port->thr);
1a2d9b30 SR	83
	84	/*
	85	* Call watchdog_reset() upon newline. This is done here in putc
	86	* since the environment code uses a single puts() to print the complete
	87	* environment upon "printenv". So we can't put this watchdog call
	88	* in puts().
	89	*/
	90	if (c == '\n')
	91	WATCHDOG_RESET();
e85390dc WD	92	}
e85390dc WD	93
f5675aa5	94	#ifndef CONFIG_NS16550_MIN_FUNCTIONS
e85390dc WD	95	char NS16550_getc (NS16550_t com_port)
e85390dc WD	96	{
167cdad1	97	while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
232c150a WD	98	#ifdef CONFIG_USB_TTY
	99	extern void usbtty_poll(void);
	100	usbtty_poll();
	101	#endif
a1b322a9	102	WATCHDOG_RESET();
232c150a	103	}
167cdad1	104	return serial_in(&com_port->rbr);
e85390dc WD	105	}
	106
	107	int NS16550_tstc (NS16550_t com_port)
	108	{
167cdad1	109	return ((serial_in(&com_port->lsr) & UART_LSR_DR) != 0);
e85390dc WD	110	}
e85390dc WD	111
f5675aa5	112	#endif /* CONFIG_NS16550_MIN_FUNCTIONS */