/* * 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 */