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author | Wolfgang Denk <wd@pollux.denx.de> | 2006-10-24 17:08:31 +0200 |
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committer | Wolfgang Denk <wd@pollux.denx.de> | 2006-10-24 17:08:31 +0200 |
commit | d97370feca2a589dad42154577bb4615a0347852 (patch) | |
tree | 5a3f85d24e07425977b7019017ae1615c0f12ce7 /drivers/atmel_usart.c | |
parent | 9fa48022e5883a0826a98979c0156f6ac5a0ef79 (diff) | |
parent | 47a6989c10685d2ab3efcf95228ce50d2a496d3e (diff) | |
download | u-boot-imx-d97370feca2a589dad42154577bb4615a0347852.zip u-boot-imx-d97370feca2a589dad42154577bb4615a0347852.tar.gz u-boot-imx-d97370feca2a589dad42154577bb4615a0347852.tar.bz2 |
Merge with /home/wd/git/u-boot/master
(Conflicts between Jon Loeliger's and Matthew McClintock's tree
were resolved by in favour of Jon's version.)
Diffstat (limited to 'drivers/atmel_usart.c')
-rw-r--r-- | drivers/atmel_usart.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/atmel_usart.c b/drivers/atmel_usart.c new file mode 100644 index 0000000..41c3768 --- /dev/null +++ b/drivers/atmel_usart.c @@ -0,0 +1,88 @@ +/* + * Copyright (C) 2004-2006 Atmel Corporation + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#include <common.h> + +#ifdef CONFIG_ATMEL_USART +#include <asm/io.h> +#include <asm/arch/platform.h> + +#include "atmel_usart.h" + +DECLARE_GLOBAL_DATA_PTR; + +void serial_setbrg(void) +{ + unsigned long divisor; + unsigned long usart_hz; + + /* + * Master Clock + * Baud Rate = -------------- + * 16 * CD + */ + usart_hz = pm_get_clock_freq(gd->console_uart->resource[0].u.clock.id); + divisor = (usart_hz / 16 + gd->baudrate / 2) / gd->baudrate; + usart3_writel(gd->console_uart, BRGR, USART3_BF(CD, divisor)); +} + +int serial_init(void) +{ + usart3_writel(gd->console_uart, CR, + USART3_BIT(RSTRX) | USART3_BIT(RSTTX)); + + serial_setbrg(); + + usart3_writel(gd->console_uart, CR, + USART3_BIT(RXEN) | USART3_BIT(TXEN)); + usart3_writel(gd->console_uart, MR, + USART3_BF(USART_MODE, USART3_USART_MODE_NORMAL) + | USART3_BF(USCLKS, USART3_USCLKS_MCK) + | USART3_BF(CHRL, USART3_CHRL_8) + | USART3_BF(PAR, USART3_PAR_NONE) + | USART3_BF(NBSTOP, USART3_NBSTOP_1)); + + return 0; +} + +void serial_putc(char c) +{ + if (c == '\n') + serial_putc('\r'); + + while (!(usart3_readl(gd->console_uart, CSR) & USART3_BIT(TXRDY))) ; + usart3_writel(gd->console_uart, THR, c); +} + +void serial_puts(const char *s) +{ + while (*s) + serial_putc(*s++); +} + +int serial_getc(void) +{ + while (!(usart3_readl(gd->console_uart, CSR) & USART3_BIT(RXRDY))) ; + return usart3_readl(gd->console_uart, RHR); +} + +int serial_tstc(void) +{ + return (usart3_readl(gd->console_uart, CSR) & USART3_BIT(RXRDY)) != 0; +} + +#endif /* CONFIG_ATMEL_USART */ |