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 --- drivers/serial/ns16550.c | 69 ++++++++++++++++++++++++++-------------------- 1 files changed, 39 insertions(+), 30 deletions(-)
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c index 23c0f76..7e833fd 100644 --- a/drivers/serial/ns16550.c +++ b/drivers/serial/ns16550.c @@ -7,6 +7,8 @@ #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 | \ @@ -14,28 +16,35 @@ #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) { - com_port->ier = 0x00; + serial_out(0x00, &com_port->ier); #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 - 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; + 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) - 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 - 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 /* CONFIG_OMAP */ } @@ -43,42 +52,42 @@ void NS16550_init (NS16550_t com_port, int baud_divisor) #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; + 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 ((com_port->lsr & UART_LSR_THRE) == 0); - com_port->thr = 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 ((com_port->lsr & UART_LSR_DR) == 0) { + 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 (com_port->rbr); + return serial_in(&com_port->rbr); }
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 */