mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-11 22:03:15 +00:00
167cdad137
The x86 architecture exclusively uses Port-Mapped I/O (inb/outb) to access the 16550 UARTs. This patch mimics how Linux selects between Memory-Mapped and Port-Mapped I/O. This allows x86 boards to use CONFIG_SERIAL_MUTLI and drop the custom serial port driver Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
93 lines
2.8 KiB
C
93 lines
2.8 KiB
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)
|
|
#else
|
|
#define serial_out(x,y) writeb(x,y)
|
|
#define serial_in(y) readb(y)
|
|
#endif
|
|
|
|
void NS16550_init (NS16550_t com_port, int baud_divisor)
|
|
{
|
|
serial_out(0x00, &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(0x00, &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);
|
|
}
|
|
|
|
#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 */
|