88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
/*
|
|
* This file is licensed under
|
|
* the terms of the GNU General Public License version 2. This program
|
|
* is licensed "as is" without any warranty of any kind, whether express
|
|
* or implied.
|
|
*
|
|
* COM1 NS16550 support
|
|
* originally from linux source (arch/ppc/boot/ns16550.c)
|
|
* modified to use CFG_ISA_MEM and new defines
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#ifdef CFG_NS16550
|
|
|
|
#include <ns16550.h>
|
|
|
|
#define LCRVAL LCR_8N1 /* 8 data, 1 stop, no parity */
|
|
#define MCRVAL (MCR_DTR | MCR_RTS) /* RTS/DTR */
|
|
#define FCRVAL (FCR_FIFO_EN | FCR_RXSR | 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_3430ZOOM2)
|
|
com_port->mdr1 = 0x7; /* mode select reset TL16C750*/
|
|
#endif
|
|
|
|
#if defined(CONFIG_3430ZOOM2)
|
|
/* On Zoom2 board Set pre-scalar to 1
|
|
* CLKSEL is GND => MCR[7] is 1 => preslr is 4
|
|
* So change the prescl to 1
|
|
*/
|
|
com_port->lcr = 0xBF;
|
|
com_port->fcr |= 0x10;
|
|
com_port->mcr &= 0x7F;
|
|
#endif
|
|
com_port->lcr = LCR_BKSE | LCRVAL;
|
|
com_port->dll = baud_divisor & 0xff;
|
|
com_port->dlm = (baud_divisor >> 8) & 0xff;
|
|
com_port->lcr = LCRVAL;
|
|
com_port->mcr = MCRVAL;
|
|
com_port->fcr = FCRVAL;
|
|
|
|
#if defined(CONFIG_OMAP) && !defined(CONFIG_3430ZOOM2)
|
|
#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
|
|
}
|
|
|
|
void NS16550_reinit (NS16550_t com_port, int baud_divisor)
|
|
{
|
|
com_port->ier = 0x00;
|
|
com_port->lcr = LCR_BKSE;
|
|
com_port->dll = baud_divisor & 0xff;
|
|
com_port->dlm = (baud_divisor >> 8) & 0xff;
|
|
com_port->lcr = LCRVAL;
|
|
com_port->mcr = MCRVAL;
|
|
com_port->fcr = FCRVAL;
|
|
}
|
|
|
|
void NS16550_putc (NS16550_t com_port, char c)
|
|
{
|
|
while ((com_port->lsr & LSR_THRE) == 0);
|
|
com_port->thr = c;
|
|
}
|
|
|
|
char NS16550_getc (NS16550_t com_port)
|
|
{
|
|
while ((com_port->lsr & 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 & LSR_DR) != 0);
|
|
}
|
|
|
|
#endif
|