1 /* 2 * COM1 NS16550 support 3 * originally from linux source (arch/ppc/boot/ns16550.c) 4 * modified to use CONFIG_SYS_ISA_MEM and new defines 5 */ 6 7 #include <config.h> 8 #include <ns16550.h> 9 10 #define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */ 11 #define UART_MCRVAL (UART_MCR_DTR | \ 12 UART_MCR_RTS) /* RTS/DTR */ 13 #define UART_FCRVAL (UART_FCR_FIFO_EN | \ 14 UART_FCR_RXSR | \ 15 UART_FCR_TXSR) /* Clear & enable FIFOs */ 16 17 void NS16550_init (NS16550_t com_port, int baud_divisor) 18 { 19 com_port->ier = 0x00; 20 #if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2) 21 com_port->mdr1 = 0x7; /* mode select reset TL16C750*/ 22 #endif 23 com_port->lcr = UART_LCR_BKSE | UART_LCRVAL; 24 com_port->dll = 0; 25 com_port->dlm = 0; 26 com_port->lcr = UART_LCRVAL; 27 com_port->mcr = UART_MCRVAL; 28 com_port->fcr = UART_FCRVAL; 29 com_port->lcr = UART_LCR_BKSE | UART_LCRVAL; 30 com_port->dll = baud_divisor & 0xff; 31 com_port->dlm = (baud_divisor >> 8) & 0xff; 32 com_port->lcr = UART_LCRVAL; 33 #if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2) 34 #if defined(CONFIG_APTIX) 35 com_port->mdr1 = 3; /* /13 mode so Aptix 6MHz can hit 115200 */ 36 #else 37 com_port->mdr1 = 0; /* /16 is proper to hit 115200 with 48MHz */ 38 #endif 39 #endif /* CONFIG_OMAP */ 40 } 41 42 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 43 void NS16550_reinit (NS16550_t com_port, int baud_divisor) 44 { 45 com_port->ier = 0x00; 46 com_port->lcr = UART_LCR_BKSE | UART_LCRVAL; 47 com_port->dll = 0; 48 com_port->dlm = 0; 49 com_port->lcr = UART_LCRVAL; 50 com_port->mcr = UART_MCRVAL; 51 com_port->fcr = UART_FCRVAL; 52 com_port->lcr = UART_LCR_BKSE; 53 com_port->dll = baud_divisor & 0xff; 54 com_port->dlm = (baud_divisor >> 8) & 0xff; 55 com_port->lcr = UART_LCRVAL; 56 } 57 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 58 59 void NS16550_putc (NS16550_t com_port, char c) 60 { 61 while ((com_port->lsr & UART_LSR_THRE) == 0); 62 com_port->thr = c; 63 } 64 65 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 66 char NS16550_getc (NS16550_t com_port) 67 { 68 while ((com_port->lsr & UART_LSR_DR) == 0) { 69 #ifdef CONFIG_USB_TTY 70 extern void usbtty_poll(void); 71 usbtty_poll(); 72 #endif 73 } 74 return (com_port->rbr); 75 } 76 77 int NS16550_tstc (NS16550_t com_port) 78 { 79 return ((com_port->lsr & UART_LSR_DR) != 0); 80 } 81 82 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 83