mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-13 06:36:16 +09:00
660888b7fb
Zoom2 serial is in general supplied by one of the 4 UARTS on the debug board. The default serial is from the USB connector on left side of the debug board. The USB connector will produce 2 of the 4 UARTS. On your host pick the first enumeration. The details of the setting of the serial gpmc setup are not available. The values were provided by another party. The serial port set up is the same with Zoom1. Baud rate 115200, 8 bit data, no parity, 1 stop bit, no flow. The kernel bootargs are console=ttyS3,115200n8 Signed-off-by: Tom Rix <Tom.Rix@windriver.com>
83 lines
2.2 KiB
C
83 lines
2.2 KiB
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 */
|