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

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

#include <config.h>
#include <ns16550.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 */

void NS16550_init (NS16550_t com_port, int baud_divisor)
{
	com_port->ier = 0x00;
#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
	com_port->mdr1 = 0x7;	/* mode select reset TL16C750*/
#endif
	com_port->lcr = UART_LCR_BKSE | UART_LCRVAL;
	com_port->dll = 0;
	com_port->dlm = 0;
	com_port->lcr = UART_LCRVAL;
	com_port->mcr = UART_MCRVAL;
	com_port->fcr = UART_FCRVAL;
	com_port->lcr = UART_LCR_BKSE | UART_LCRVAL;
	com_port->dll = baud_divisor & 0xff;
	com_port->dlm = (baud_divisor >> 8) & 0xff;
	com_port->lcr = UART_LCRVAL;
#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
#if defined(CONFIG_APTIX)
	com_port->mdr1 = 3;	/* /13 mode so Aptix 6MHz can hit 115200 */
#else
	com_port->mdr1 = 0;	/* /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)
{
	com_port->ier = 0x00;
	com_port->lcr = UART_LCR_BKSE | UART_LCRVAL;
	com_port->dll = 0;
	com_port->dlm = 0;
	com_port->lcr = UART_LCRVAL;
	com_port->mcr = UART_MCRVAL;
	com_port->fcr = UART_FCRVAL;
	com_port->lcr = UART_LCR_BKSE;
	com_port->dll = baud_divisor & 0xff;
	com_port->dlm = (baud_divisor >> 8) & 0xff;
	com_port->lcr = UART_LCRVAL;
}
#endif /* CONFIG_NS16550_MIN_FUNCTIONS */

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

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

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

#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
Commit	Line	Data
e85390dc WD	1	/*
	2	* COM1 NS16550 support
	3	* originally from linux source (arch/ppc/boot/ns16550.c)
6d0f6bcf	4	* modified to use CONFIG_SYS_ISA_MEM and new defines
e85390dc WD	5	*/
	6
	7	#include <config.h>
e85390dc WD	8	#include <ns16550.h>
e85390dc WD	9
200779e3 DZ	10	#define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */
	11	#define UART_MCRVAL (UART_MCR_DTR \| \
	12	UART_MCR_RTS) /* RTS/DTR */
	13	#define UART_FCRVAL (UART_FCR_FIFO_EN \| \
	14	UART_FCR_RXSR \| \
	15	UART_FCR_TXSR) /* Clear & enable FIFOs */
e85390dc WD	16
	17	void NS16550_init (NS16550_t com_port, int baud_divisor)
	18	{
	19	com_port->ier = 0x00;
660888b7	20	#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
232c150a	21	com_port->mdr1 = 0x7; /* mode select reset TL16C750*/
945af8d7	22	#endif
200779e3	23	com_port->lcr = UART_LCR_BKSE \| UART_LCRVAL;
7ec8bb15 WD	24	com_port->dll = 0;
7ec8bb15 WD	25	com_port->dlm = 0;
200779e3 DZ	26	com_port->lcr = UART_LCRVAL;
	27	com_port->mcr = UART_MCRVAL;
	28	com_port->fcr = UART_FCRVAL;
	29	com_port->lcr = UART_LCR_BKSE \| UART_LCRVAL;
7ec8bb15 WD	30	com_port->dll = baud_divisor & 0xff;
7ec8bb15 WD	31	com_port->dlm = (baud_divisor >> 8) & 0xff;
200779e3	32	com_port->lcr = UART_LCRVAL;
660888b7	33	#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
8ed96046 WD	34	#if defined(CONFIG_APTIX)
	35	com_port->mdr1 = 3; /* /13 mode so Aptix 6MHz can hit 115200 */
	36	#else
	37	com_port->mdr1 = 0; /* /16 is proper to hit 115200 with 48MHz */
	38	#endif
b4746d8b	39	#endif /* CONFIG_OMAP */
e85390dc WD	40	}
e85390dc WD	41
f5675aa5	42	#ifndef CONFIG_NS16550_MIN_FUNCTIONS
e85390dc WD	43	void NS16550_reinit (NS16550_t com_port, int baud_divisor)
	44	{
	45	com_port->ier = 0x00;
200779e3	46	com_port->lcr = UART_LCR_BKSE \| UART_LCRVAL;
7ec8bb15 WD	47	com_port->dll = 0;
7ec8bb15 WD	48	com_port->dlm = 0;
200779e3 DZ	49	com_port->lcr = UART_LCRVAL;
	50	com_port->mcr = UART_MCRVAL;
	51	com_port->fcr = UART_FCRVAL;
	52	com_port->lcr = UART_LCR_BKSE;
e85390dc WD	53	com_port->dll = baud_divisor & 0xff;
e85390dc WD	54	com_port->dlm = (baud_divisor >> 8) & 0xff;
200779e3	55	com_port->lcr = UART_LCRVAL;
e85390dc	56	}
f5675aa5	57	#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
e85390dc WD	58
	59	void NS16550_putc (NS16550_t com_port, char c)
	60	{
200779e3	61	while ((com_port->lsr & UART_LSR_THRE) == 0);
e85390dc WD	62	com_port->thr = c;
	63	}
	64
f5675aa5	65	#ifndef CONFIG_NS16550_MIN_FUNCTIONS
e85390dc WD	66	char NS16550_getc (NS16550_t com_port)
e85390dc WD	67	{
200779e3	68	while ((com_port->lsr & UART_LSR_DR) == 0) {
232c150a WD	69	#ifdef CONFIG_USB_TTY
	70	extern void usbtty_poll(void);
	71	usbtty_poll();
	72	#endif
	73	}
e85390dc WD	74	return (com_port->rbr);
	75	}
	76
	77	int NS16550_tstc (NS16550_t com_port)
	78	{
200779e3	79	return ((com_port->lsr & UART_LSR_DR) != 0);
e85390dc WD	80	}
e85390dc WD	81
f5675aa5	82	#endif /* CONFIG_NS16550_MIN_FUNCTIONS */