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 LCRVAL LCR_8N1 /* 8 data, 1 stop, no parity */ 11 #define MCRVAL (MCR_DTR | MCR_RTS) /* RTS/DTR */ 12 #define FCRVAL (FCR_FIFO_EN | FCR_RXSR | FCR_TXSR) /* Clear & enable FIFOs */ 13 14 void NS16550_init (NS16550_t com_port, int baud_divisor) 15 { 16 com_port->ier = 0x00; 17 #ifdef CONFIG_OMAP 18 com_port->mdr1 = 0x7; /* mode select reset TL16C750*/ 19 #endif 20 com_port->lcr = LCR_BKSE | LCRVAL; 21 com_port->dll = 0; 22 com_port->dlm = 0; 23 com_port->lcr = LCRVAL; 24 com_port->mcr = MCRVAL; 25 com_port->fcr = FCRVAL; 26 com_port->lcr = LCR_BKSE | LCRVAL; 27 com_port->dll = baud_divisor & 0xff; 28 com_port->dlm = (baud_divisor >> 8) & 0xff; 29 com_port->lcr = LCRVAL; 30 #if defined(CONFIG_OMAP) 31 #if defined(CONFIG_APTIX) 32 com_port->mdr1 = 3; /* /13 mode so Aptix 6MHz can hit 115200 */ 33 #else 34 com_port->mdr1 = 0; /* /16 is proper to hit 115200 with 48MHz */ 35 #endif 36 #endif /* CONFIG_OMAP */ 37 } 38 39 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 40 void NS16550_reinit (NS16550_t com_port, int baud_divisor) 41 { 42 com_port->ier = 0x00; 43 com_port->lcr = LCR_BKSE | LCRVAL; 44 com_port->dll = 0; 45 com_port->dlm = 0; 46 com_port->lcr = LCRVAL; 47 com_port->mcr = MCRVAL; 48 com_port->fcr = FCRVAL; 49 com_port->lcr = LCR_BKSE; 50 com_port->dll = baud_divisor & 0xff; 51 com_port->dlm = (baud_divisor >> 8) & 0xff; 52 com_port->lcr = LCRVAL; 53 } 54 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 55 56 void NS16550_putc (NS16550_t com_port, char c) 57 { 58 while ((com_port->lsr & LSR_THRE) == 0); 59 com_port->thr = c; 60 } 61 62 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 63 char NS16550_getc (NS16550_t com_port) 64 { 65 while ((com_port->lsr & LSR_DR) == 0) { 66 #ifdef CONFIG_USB_TTY 67 extern void usbtty_poll(void); 68 usbtty_poll(); 69 #endif 70 } 71 return (com_port->rbr); 72 } 73 74 int NS16550_tstc (NS16550_t com_port) 75 { 76 return ((com_port->lsr & LSR_DR) != 0); 77 } 78 79 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 80