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 #include <watchdog.h> 10 11 #define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */ 12 #define UART_MCRVAL (UART_MCR_DTR | \ 13 UART_MCR_RTS) /* RTS/DTR */ 14 #define UART_FCRVAL (UART_FCR_FIFO_EN | \ 15 UART_FCR_RXSR | \ 16 UART_FCR_TXSR) /* Clear & enable FIFOs */ 17 18 void NS16550_init (NS16550_t com_port, int baud_divisor) 19 { 20 com_port->ier = 0x00; 21 #if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2) 22 com_port->mdr1 = 0x7; /* mode select reset TL16C750*/ 23 #endif 24 com_port->lcr = UART_LCR_BKSE | UART_LCRVAL; 25 com_port->dll = 0; 26 com_port->dlm = 0; 27 com_port->lcr = UART_LCRVAL; 28 com_port->mcr = UART_MCRVAL; 29 com_port->fcr = UART_FCRVAL; 30 com_port->lcr = UART_LCR_BKSE | UART_LCRVAL; 31 com_port->dll = baud_divisor & 0xff; 32 com_port->dlm = (baud_divisor >> 8) & 0xff; 33 com_port->lcr = UART_LCRVAL; 34 #if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2) 35 #if defined(CONFIG_APTIX) 36 com_port->mdr1 = 3; /* /13 mode so Aptix 6MHz can hit 115200 */ 37 #else 38 com_port->mdr1 = 0; /* /16 is proper to hit 115200 with 48MHz */ 39 #endif 40 #endif /* CONFIG_OMAP */ 41 } 42 43 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 44 void NS16550_reinit (NS16550_t com_port, int baud_divisor) 45 { 46 com_port->ier = 0x00; 47 com_port->lcr = UART_LCR_BKSE | UART_LCRVAL; 48 com_port->dll = 0; 49 com_port->dlm = 0; 50 com_port->lcr = UART_LCRVAL; 51 com_port->mcr = UART_MCRVAL; 52 com_port->fcr = UART_FCRVAL; 53 com_port->lcr = UART_LCR_BKSE; 54 com_port->dll = baud_divisor & 0xff; 55 com_port->dlm = (baud_divisor >> 8) & 0xff; 56 com_port->lcr = UART_LCRVAL; 57 } 58 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 59 60 void NS16550_putc (NS16550_t com_port, char c) 61 { 62 while ((com_port->lsr & UART_LSR_THRE) == 0); 63 com_port->thr = c; 64 } 65 66 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 67 char NS16550_getc (NS16550_t com_port) 68 { 69 while ((com_port->lsr & UART_LSR_DR) == 0) { 70 #ifdef CONFIG_USB_TTY 71 extern void usbtty_poll(void); 72 usbtty_poll(); 73 #endif 74 WATCHDOG_RESET(); 75 } 76 return (com_port->rbr); 77 } 78 79 int NS16550_tstc (NS16550_t com_port) 80 { 81 return ((com_port->lsr & UART_LSR_DR) != 0); 82 } 83 84 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 85