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>
94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
/*
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* COM1 NS16550 support
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* originally from linux source (arch/powerpc/boot/ns16550.c)
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* modified to use CONFIG_SYS_ISA_MEM and new defines
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*/
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#include <config.h>
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#include <ns16550.h>
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#include <watchdog.h>
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#include <linux/types.h>
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#include <asm/io.h>
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#define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */
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#define UART_MCRVAL (UART_MCR_DTR | \
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UART_MCR_RTS) /* RTS/DTR */
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#define UART_FCRVAL (UART_FCR_FIFO_EN | \
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UART_FCR_RXSR | \
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UART_FCR_TXSR) /* Clear & enable FIFOs */
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#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
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#define serial_out(x,y) outb(x,(ulong)y)
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#define serial_in(y) inb((ulong)y)
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#else
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#define serial_out(x,y) writeb(x,y)
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#define serial_in(y) readb(y)
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#endif
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void NS16550_init (NS16550_t com_port, int baud_divisor)
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{
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serial_out(0x00, &com_port->ier);
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#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
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serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
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#endif
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serial_out(UART_LCR_BKSE | UART_LCRVAL, (ulong)&com_port->lcr);
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serial_out(0, &com_port->dll);
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serial_out(0, &com_port->dlm);
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serial_out(UART_LCRVAL, &com_port->lcr);
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serial_out(UART_MCRVAL, &com_port->mcr);
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serial_out(UART_FCRVAL, &com_port->fcr);
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serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
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serial_out(baud_divisor & 0xff, &com_port->dll);
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serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
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serial_out(UART_LCRVAL, &com_port->lcr);
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#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
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#if defined(CONFIG_APTIX)
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serial_out(3, &com_port->mdr1); /* /13 mode so Aptix 6MHz can hit 115200 */
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#else
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serial_out(0, &com_port->mdr1); /* /16 is proper to hit 115200 with 48MHz */
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#endif
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#endif /* CONFIG_OMAP */
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}
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#ifndef CONFIG_NS16550_MIN_FUNCTIONS
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void NS16550_reinit (NS16550_t com_port, int baud_divisor)
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{
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serial_out(0x00, &com_port->ier);
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serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
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serial_out(0, &com_port->dll);
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serial_out(0, &com_port->dlm);
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serial_out(UART_LCRVAL, &com_port->lcr);
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serial_out(UART_MCRVAL, &com_port->mcr);
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serial_out(UART_FCRVAL, &com_port->fcr);
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serial_out(UART_LCR_BKSE, &com_port->lcr);
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serial_out(baud_divisor & 0xff, &com_port->dll);
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serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
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serial_out(UART_LCRVAL, &com_port->lcr);
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}
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#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
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void NS16550_putc (NS16550_t com_port, char c)
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{
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while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0);
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serial_out(c, &com_port->thr);
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}
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#ifndef CONFIG_NS16550_MIN_FUNCTIONS
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char NS16550_getc (NS16550_t com_port)
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{
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while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
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#ifdef CONFIG_USB_TTY
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extern void usbtty_poll(void);
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usbtty_poll();
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#endif
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WATCHDOG_RESET();
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}
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return serial_in(&com_port->rbr);
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}
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int NS16550_tstc (NS16550_t com_port)
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{
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return ((serial_in(&com_port->lsr) & UART_LSR_DR) != 0);
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}
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#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
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