projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| e85390dc WD |
1 | /* |
| 2 | * COM1 NS16550 support | |
| 3 | * originally from linux source (arch/ppc/boot/ns16550.c) | |
| 6d0f6bcf | 4 | * modified to use CONFIG_SYS_ISA_MEM and new defines |
| e85390dc WD |
5 | */ |
| 6 | ||
| 7 | #include <config.h> | |
| 8 | ||
| 6d0f6bcf | 9 | #ifdef CONFIG_SYS_NS16550 |
| e85390dc WD |
10 | |
| 11 | #include <ns16550.h> | |
| 12 | ||
| 13 | #define LCRVAL LCR_8N1 /* 8 data, 1 stop, no parity */ | |
| 14 | #define MCRVAL (MCR_DTR | MCR_RTS) /* RTS/DTR */ | |
| 15 | #define FCRVAL (FCR_FIFO_EN | FCR_RXSR | FCR_TXSR) /* Clear & enable FIFOs */ | |
| 16 | ||
| 17 | void NS16550_init (NS16550_t com_port, int baud_divisor) | |
| 18 | { | |
| 19 | com_port->ier = 0x00; | |
| 8ed96046 | 20 | #ifdef CONFIG_OMAP |
| 232c150a | 21 | com_port->mdr1 = 0x7; /* mode select reset TL16C750*/ |
| 945af8d7 | 22 | #endif |
| e85390dc | 23 | com_port->lcr = LCR_BKSE | LCRVAL; |
| 7ec8bb15 WD |
24 | com_port->dll = 0; |
| 25 | com_port->dlm = 0; | |
| e85390dc WD |
26 | com_port->lcr = LCRVAL; |
| 27 | com_port->mcr = MCRVAL; | |
| 28 | com_port->fcr = FCRVAL; | |
| 7ec8bb15 WD |
29 | com_port->lcr = LCR_BKSE | LCRVAL; |
| 30 | com_port->dll = baud_divisor & 0xff; | |
| 31 | com_port->dlm = (baud_divisor >> 8) & 0xff; | |
| 32 | com_port->lcr = LCRVAL; | |
| 8ed96046 WD |
33 | #if defined(CONFIG_OMAP) |
| 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 | |
| 2e5983d2 | 39 | #endif |
| e85390dc WD |
40 | } |
| 41 | ||
| 42 | void NS16550_reinit (NS16550_t com_port, int baud_divisor) | |
| 43 | { | |
| 44 | com_port->ier = 0x00; | |
| 7ec8bb15 WD |
45 | com_port->lcr = LCR_BKSE | LCRVAL; |
| 46 | com_port->dll = 0; | |
| 47 | com_port->dlm = 0; | |
| 48 | com_port->lcr = LCRVAL; | |
| 49 | com_port->mcr = MCRVAL; | |
| 50 | com_port->fcr = FCRVAL; | |
| e85390dc WD |
51 | com_port->lcr = LCR_BKSE; |
| 52 | com_port->dll = baud_divisor & 0xff; | |
| 53 | com_port->dlm = (baud_divisor >> 8) & 0xff; | |
| 54 | com_port->lcr = LCRVAL; | |
| e85390dc WD |
55 | } |
| 56 | ||
| 57 | void NS16550_putc (NS16550_t com_port, char c) | |
| 58 | { | |
| 59 | while ((com_port->lsr & LSR_THRE) == 0); | |
| 60 | com_port->thr = c; | |
| 61 | } | |
| 62 | ||
| 63 | char NS16550_getc (NS16550_t com_port) | |
| 64 | { | |
| 232c150a WD |
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 | } | |
| e85390dc WD |
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 |