diff options
Diffstat (limited to 'carl9170fw/carlfw/src/uart.c')
| -rw-r--r-- | carl9170fw/carlfw/src/uart.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/carl9170fw/carlfw/src/uart.c b/carl9170fw/carlfw/src/uart.c new file mode 100644 index 0000000..58f6486 --- /dev/null +++ b/carl9170fw/carlfw/src/uart.c @@ -0,0 +1,76 @@ +/* + * carl9170 firmware - used by the ar9170 wireless device + * + * UART debug interface functions. + * + * Copyright (c) 2000-2005 ZyDAS Technology Corporation + * Copyright (c) 2007-2009 Atheros Communications, Inc. + * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> + * Copyright 2009-2011 Christian Lamparter <chunkeey@googlemail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "carl9170.h" +#include "uart.h" +#include "io.h" + +#ifdef CONFIG_CARL9170FW_DEBUG_UART +void uart_putc(const char c) +{ + set(AR9170_UART_REG_TX_HOLDING, c); + + while (get(AR9170_UART_REG_LINE_STATUS) & + AR9170_UART_LINE_STS_TX_FIFO_ALMOST_EMPTY) { + /* + * wait until the byte has made it + */ + } +} + +void uart_print_hex_dump(const void *buf, const int len) +{ + unsigned int offset = 0; + + uart_putc('H'); + uart_putc('D'); + uart_putc(':'); + + while (len > 0) { + uart_putc(*((uint8_t *) buf + offset)); + offset++; + } +} + +void uart_init(void) +{ + unsigned int timeout = 0; + +#ifdef CONFIG_CARL9170FW_UART_CLOCK_25M + set(AR9170_UART_REG_DIVISOR_LSB, 0xc); +#elif CONFIG_CARL9170FW_UART_CLOCK_40M + set(AR9170_UART_REG_DIVISOR_LSB, 0x14); /* 40 MHz */ + set(AR9170_UART_REG_REMAINDER, 0xb38e); +#else +#error "Unsupported UART clock" +#endif /* CARL9170FW_UART_CLOCK_25M */ + + while (get(AR9170_UART_REG_LINE_STATUS) & + AR9170_UART_LINE_STS_TRANSMITTER_EMPTY) { + if (timeout++ >= 10000) + break; + } +} +#endif /* CONFIG_CARL9170FW_DEBUG_UART */ |