projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| e85390dc WD |
1 | /* |
| 2 | * COM1 NS16550 support | |
| a47a12be | 3 | * originally from linux source (arch/powerpc/boot/ns16550.c) |
| 6d0f6bcf | 4 | * modified to use CONFIG_SYS_ISA_MEM and new defines |
| e85390dc WD |
5 | */ |
| 6 | ||
| 7 | #include <config.h> | |
| e85390dc | 8 | #include <ns16550.h> |
| a1b322a9 | 9 | #include <watchdog.h> |
| e85390dc | 10 | |
| 200779e3 DZ |
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 */ | |
| e85390dc WD |
17 | |
| 18 | void NS16550_init (NS16550_t com_port, int baud_divisor) | |
| 19 | { | |
| 20 | com_port->ier = 0x00; | |
| 660888b7 | 21 | #if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2) |
| 232c150a | 22 | com_port->mdr1 = 0x7; /* mode select reset TL16C750*/ |
| 945af8d7 | 23 | #endif |
| 200779e3 | 24 | com_port->lcr = UART_LCR_BKSE | UART_LCRVAL; |
| 7ec8bb15 WD |
25 | com_port->dll = 0; |
| 26 | com_port->dlm = 0; | |
| 200779e3 DZ |
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; | |
| 7ec8bb15 WD |
31 | com_port->dll = baud_divisor & 0xff; |
| 32 | com_port->dlm = (baud_divisor >> 8) & 0xff; | |
| 200779e3 | 33 | com_port->lcr = UART_LCRVAL; |
| 660888b7 | 34 | #if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2) |
| 8ed96046 WD |
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 | |
| b4746d8b | 40 | #endif /* CONFIG_OMAP */ |
| e85390dc WD |
41 | } |
| 42 | ||
| f5675aa5 | 43 | #ifndef CONFIG_NS16550_MIN_FUNCTIONS |
| e85390dc WD |
44 | void NS16550_reinit (NS16550_t com_port, int baud_divisor) |
| 45 | { | |
| 46 | com_port->ier = 0x00; | |
| 200779e3 | 47 | com_port->lcr = UART_LCR_BKSE | UART_LCRVAL; |
| 7ec8bb15 WD |
48 | com_port->dll = 0; |
| 49 | com_port->dlm = 0; | |
| 200779e3 DZ |
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; | |
| e85390dc WD |
54 | com_port->dll = baud_divisor & 0xff; |
| 55 | com_port->dlm = (baud_divisor >> 8) & 0xff; | |
| 200779e3 | 56 | com_port->lcr = UART_LCRVAL; |
| e85390dc | 57 | } |
| f5675aa5 | 58 | #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ |
| e85390dc WD |
59 | |
| 60 | void NS16550_putc (NS16550_t com_port, char c) | |
| 61 | { | |
| 200779e3 | 62 | while ((com_port->lsr & UART_LSR_THRE) == 0); |
| e85390dc WD |
63 | com_port->thr = c; |
| 64 | } | |
| 65 | ||
| f5675aa5 | 66 | #ifndef CONFIG_NS16550_MIN_FUNCTIONS |
| e85390dc WD |
67 | char NS16550_getc (NS16550_t com_port) |
| 68 | { | |
| 200779e3 | 69 | while ((com_port->lsr & UART_LSR_DR) == 0) { |
| 232c150a WD |
70 | #ifdef CONFIG_USB_TTY |
| 71 | extern void usbtty_poll(void); | |
| 72 | usbtty_poll(); | |
| 73 | #endif | |
| a1b322a9 | 74 | WATCHDOG_RESET(); |
| 232c150a | 75 | } |
| e85390dc WD |
76 | return (com_port->rbr); |
| 77 | } | |
| 78 | ||
| 79 | int NS16550_tstc (NS16550_t com_port) | |
| 80 | { | |
| 200779e3 | 81 | return ((com_port->lsr & UART_LSR_DR) != 0); |
| e85390dc WD |
82 | } |
| 83 | ||
| f5675aa5 | 84 | #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ |