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SERIAL: Enable port-mapped access

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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>
This commit is contained in:
Graeme Russ 2010-04-24 00:05:46 +10:00 committed by Wolfgang Denk
parent 153c2d9f23
commit 167cdad137
1 changed files with 39 additions and 30 deletions
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69
drivers/serial/ns16550.c
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@ -7,6 +7,8 @@
#include <config.h> #include <config.h>
#include <ns16550.h> #include <ns16550.h>
#include <watchdog.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_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */
#define UART_MCRVAL (UART_MCR_DTR | \ #define UART_MCRVAL (UART_MCR_DTR | \
@ -14,28 +16,35 @@
#define UART_FCRVAL (UART_FCR_FIFO_EN | \ #define UART_FCRVAL (UART_FCR_FIFO_EN | \
UART_FCR_RXSR | \ UART_FCR_RXSR | \
UART_FCR_TXSR) /* Clear & enable FIFOs */ 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) void NS16550_init (NS16550_t com_port, int baud_divisor)
{ {
com_port->ier = 0x00; serial_out(0x00, &com_port->ier);
#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2) #if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
com_port->mdr1 = 0x7; /* mode select reset TL16C750*/ serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
#endif #endif
com_port->lcr = UART_LCR_BKSE | UART_LCRVAL; serial_out(UART_LCR_BKSE | UART_LCRVAL, (ulong)&com_port->lcr);
com_port->dll = 0; serial_out(0, &com_port->dll);
com_port->dlm = 0; serial_out(0, &com_port->dlm);
com_port->lcr = UART_LCRVAL; serial_out(UART_LCRVAL, &com_port->lcr);
com_port->mcr = UART_MCRVAL; serial_out(UART_MCRVAL, &com_port->mcr);
com_port->fcr = UART_FCRVAL; serial_out(UART_FCRVAL, &com_port->fcr);
com_port->lcr = UART_LCR_BKSE | UART_LCRVAL; serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
com_port->dll = baud_divisor & 0xff; serial_out(baud_divisor & 0xff, &com_port->dll);
com_port->dlm = (baud_divisor >> 8) & 0xff; serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
com_port->lcr = UART_LCRVAL; serial_out(UART_LCRVAL, &com_port->lcr);
#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2) #if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
#if defined(CONFIG_APTIX) #if defined(CONFIG_APTIX)
com_port->mdr1 = 3; /* /13 mode so Aptix 6MHz can hit 115200 */ serial_out(3, &com_port->mdr1); /* /13 mode so Aptix 6MHz can hit 115200 */
#else #else
com_port->mdr1 = 0; /* /16 is proper to hit 115200 with 48MHz */ serial_out(0, &com_port->mdr1); /* /16 is proper to hit 115200 with 48MHz */
#endif #endif
#endif /* CONFIG_OMAP */ #endif /* CONFIG_OMAP */
} }
@ -43,42 +52,42 @@ void NS16550_init (NS16550_t com_port, int baud_divisor)
#ifndef CONFIG_NS16550_MIN_FUNCTIONS #ifndef CONFIG_NS16550_MIN_FUNCTIONS
void NS16550_reinit (NS16550_t com_port, int baud_divisor) void NS16550_reinit (NS16550_t com_port, int baud_divisor)
{ {
com_port->ier = 0x00; serial_out(0x00, &com_port->ier);
com_port->lcr = UART_LCR_BKSE | UART_LCRVAL; serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
com_port->dll = 0; serial_out(0, &com_port->dll);
com_port->dlm = 0; serial_out(0, &com_port->dlm);
com_port->lcr = UART_LCRVAL; serial_out(UART_LCRVAL, &com_port->lcr);
com_port->mcr = UART_MCRVAL; serial_out(UART_MCRVAL, &com_port->mcr);
com_port->fcr = UART_FCRVAL; serial_out(UART_FCRVAL, &com_port->fcr);
com_port->lcr = UART_LCR_BKSE; serial_out(UART_LCR_BKSE, &com_port->lcr);
com_port->dll = baud_divisor & 0xff; serial_out(baud_divisor & 0xff, &com_port->dll);
com_port->dlm = (baud_divisor >> 8) & 0xff; serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
com_port->lcr = UART_LCRVAL; serial_out(UART_LCRVAL, &com_port->lcr);
} }
#endif /* CONFIG_NS16550_MIN_FUNCTIONS */ #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
void NS16550_putc (NS16550_t com_port, char c) void NS16550_putc (NS16550_t com_port, char c)
{ {
while ((com_port->lsr & UART_LSR_THRE) == 0); while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0);
com_port->thr = c; serial_out(c, &com_port->thr);
} }
#ifndef CONFIG_NS16550_MIN_FUNCTIONS #ifndef CONFIG_NS16550_MIN_FUNCTIONS
char NS16550_getc (NS16550_t com_port) char NS16550_getc (NS16550_t com_port)
{ {
while ((com_port->lsr & UART_LSR_DR) == 0) { while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
#ifdef CONFIG_USB_TTY #ifdef CONFIG_USB_TTY
extern void usbtty_poll(void); extern void usbtty_poll(void);
usbtty_poll(); usbtty_poll();
#endif #endif
WATCHDOG_RESET(); WATCHDOG_RESET();
} }
return (com_port->rbr); return serial_in(&com_port->rbr);
} }
int NS16550_tstc (NS16550_t com_port) int NS16550_tstc (NS16550_t com_port)
{ {
return ((com_port->lsr & UART_LSR_DR) != 0); return ((serial_in(&com_port->lsr) & UART_LSR_DR) != 0);
} }
#endif /* CONFIG_NS16550_MIN_FUNCTIONS */ #endif /* CONFIG_NS16550_MIN_FUNCTIONS */