diff options
Diffstat (limited to 'drivers/serial/serial_vybrid.c')
-rw-r--r-- | drivers/serial/serial_vybrid.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/drivers/serial/serial_vybrid.c b/drivers/serial/serial_vybrid.c new file mode 100644 index 00000000000..89c51625c6e --- /dev/null +++ b/drivers/serial/serial_vybrid.c @@ -0,0 +1,113 @@ +/* + * Copyright 2012 Freescale Semiconductor, Inc. + * + * 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> +#include <watchdog.h> +#include <asm/io.h> +#include <asm/arch/vybrid-regs.h> +#include <asm/arch/serial-vybrid.h> +#include <asm/arch/clock.h> + +#ifndef CONFIG_VYBRID_UART_BASE +#error "define CONFIG_VYBRID_UART_BASE to use the VYBRID UART driver" +#endif + +#define UART_CONSOLE \ + (CONFIG_VYBRID_UART_BASE + (CONFIG_SYS_UART_PORT * 0x1000)) + +#ifdef CONFIG_SERIAL_MULTI +#warning "Vybrid driver does not support MULTI serials." +#endif + +DECLARE_GLOBAL_DATA_PTR; + +void serial_setbrg(void) +{ + u32 clk = vybrid_get_uartclk(); + u16 sbr; + + if (!gd->baudrate) + gd->baudrate = CONFIG_BAUDRATE; + + sbr = (u16)(clk / (16 * gd->baudrate)); + /* place adjustment later - n/32 BRFA */ + + out_8((UART_CONSOLE + UBDH), (sbr >> 8)); + out_8((UART_CONSOLE + UBDL), (sbr & 0xFF)); +} + +int serial_getc(void) +{ + while (!(in_8(UART_CONSOLE + US1) & US1_RDRF)) + WATCHDOG_RESET(); + + setbits_8((UART_CONSOLE + US1), US1_RDRF); + + return in_8(UART_CONSOLE + UD); +} + +void serial_putc(const char c) +{ + if (c == '\n') + serial_putc('\r'); + + while (!(in_8(UART_CONSOLE + US1) & US1_TDRE)) + WATCHDOG_RESET(); + + out_8((UART_CONSOLE + UD), c); +} + +/* + * Test whether a character is in the RX buffer + */ +int serial_tstc(void) +{ + if (in_8(UART_CONSOLE + URCFIFO) == 0) + return 0; + + return 1; +} + +void +serial_puts(const char *s) +{ + while (*s) + serial_putc(*s++); +} + +/* + * Initialise the serial port with the given baudrate. The settings + * are always 8 data bits, no parity, 1 stop bit, no start bits. + */ +int serial_init(void) +{ + clrbits_8((UART_CONSOLE + UC2), UC2_RE); + clrbits_8((UART_CONSOLE + UC2), UC2_TE); + + out_8((UART_CONSOLE + UMODEM), 0); + out_8((UART_CONSOLE + UC1), 0); + + /* provide data bits, parity, stop bit, etc */ + + serial_setbrg(); + + out_8((UART_CONSOLE + UC2), (UC2_RE | UC2_TE)); + + return 0; +} |