projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 9171fc81 MF |
1 | /* |
| 2 | * U-boot - serial.c Blackfin Serial Driver | |
| 3 | * | |
| 4 | * Copyright (c) 2005-2008 Analog Devices Inc. | |
| 5 | * | |
| 6 | * Copyright (c) 2003 Bas Vermeulen <bas@buyways.nl>, | |
| 53677ef1 | 7 | * BuyWays B.V. (www.buyways.nl) |
| 9171fc81 MF |
8 | * |
| 9 | * Based heavily on: | |
| 10 | * blkfinserial.c: Serial driver for BlackFin DSP internal USRTs. | |
| 11 | * Copyright(c) 2003 Metrowerks <mwaddel@metrowerks.com> | |
| 12 | * Copyright(c) 2001 Tony Z. Kou <tonyko@arcturusnetworks.com> | |
| 13 | * Copyright(c) 2001-2002 Arcturus Networks Inc. <www.arcturusnetworks.com> | |
| 14 | * | |
| 15 | * Based on code from 68328 version serial driver imlpementation which was: | |
| 16 | * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu> | |
| 17 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> | |
| 18 | * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org> | |
| 19 | * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com> | |
| 20 | * | |
| 21 | * (C) Copyright 2000-2004 | |
| 22 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
| 23 | * | |
| 24 | * Licensed under the GPL-2 or later. | |
| 25 | */ | |
| 26 | ||
| 27 | #include <common.h> | |
| 28 | #include <watchdog.h> | |
| 29 | #include <asm/blackfin.h> | |
| 30 | #include <asm/mach-common/bits/uart.h> | |
| 31 | ||
| 32 | #if defined(UART_LSR) && (CONFIG_UART_CONSOLE != 0) | |
| 33 | # error CONFIG_UART_CONSOLE must be 0 on parts with only one UART | |
| 34 | #endif | |
| 35 | ||
| 36 | #include "serial.h" | |
| 37 | ||
| 38 | /* Symbol for our assembly to call. */ | |
| 39 | void serial_set_baud(uint32_t baud) | |
| 40 | { | |
| 41 | serial_early_set_baud(baud); | |
| 42 | } | |
| 43 | ||
| 44 | /* Symbol for common u-boot code to call. | |
| 45 | * Setup the baudrate (brg: baudrate generator). | |
| 46 | */ | |
| 47 | void serial_setbrg(void) | |
| 48 | { | |
| 49 | DECLARE_GLOBAL_DATA_PTR; | |
| 50 | serial_set_baud(gd->baudrate); | |
| 51 | } | |
| 52 | ||
| 53 | /* Symbol for our assembly to call. */ | |
| 54 | void serial_initialize(void) | |
| 55 | { | |
| 56 | serial_early_init(); | |
| 57 | } | |
| 58 | ||
| 59 | /* Symbol for common u-boot code to call. */ | |
| 60 | int serial_init(void) | |
| 61 | { | |
| 62 | serial_initialize(); | |
| 63 | serial_setbrg(); | |
| 64 | return 0; | |
| 65 | } | |
| 66 | ||
| 67 | void serial_putc(const char c) | |
| 68 | { | |
| 69 | /* send a \r for compatibility */ | |
| 70 | if (c == '\n') | |
| 71 | serial_putc('\r'); | |
| 72 | ||
| 73 | WATCHDOG_RESET(); | |
| 74 | ||
| 75 | /* wait for the hardware fifo to clear up */ | |
| 76 | while (!(*pUART_LSR & THRE)) | |
| 77 | continue; | |
| 78 | ||
| 79 | /* queue the character for transmission */ | |
| 80 | *pUART_THR = c; | |
| 81 | SSYNC(); | |
| 82 | ||
| 83 | WATCHDOG_RESET(); | |
| 84 | ||
| 85 | /* wait for the byte to be shifted over the line */ | |
| 86 | while (!(*pUART_LSR & TEMT)) | |
| 87 | continue; | |
| 88 | } | |
| 89 | ||
| 90 | int serial_tstc(void) | |
| 91 | { | |
| 92 | WATCHDOG_RESET(); | |
| 93 | return (*pUART_LSR & DR) ? 1 : 0; | |
| 94 | } | |
| 95 | ||
| 96 | int serial_getc(void) | |
| 97 | { | |
| 98 | uint16_t uart_lsr_val, uart_rbr_val; | |
| 99 | ||
| 100 | /* wait for data ! */ | |
| 101 | while (!serial_tstc()) | |
| 102 | continue; | |
| 103 | ||
| 104 | /* clear the status and grab the new byte */ | |
| 105 | uart_lsr_val = *pUART_LSR; | |
| 106 | uart_rbr_val = *pUART_RBR; | |
| 107 | ||
| 108 | if (uart_lsr_val & (OE|PE|FE|BI)) { | |
| 109 | /* Some parts are read-to-clear while others are | |
| 110 | * write-to-clear. Just do the write for everyone | |
| 111 | * since it cant hurt (other than code size). | |
| 112 | */ | |
| 113 | *pUART_LSR = (OE|PE|FE|BI); | |
| 114 | return -1; | |
| 115 | } | |
| 116 | ||
| 117 | return uart_rbr_val & 0xFF; | |
| 118 | } | |
| 119 | ||
| 120 | void serial_puts(const char *s) | |
| 121 | { | |
| 122 | while (*s) | |
| 123 | serial_putc(*s++); | |
| 124 | } |