diff options
Diffstat (limited to 'sys/arm/allwinner/console.c')
| -rw-r--r-- | sys/arm/allwinner/console.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/sys/arm/allwinner/console.c b/sys/arm/allwinner/console.c new file mode 100644 index 0000000..c6538de --- /dev/null +++ b/sys/arm/allwinner/console.c @@ -0,0 +1,146 @@ +/*- + * Copyright (c) 2012 Ganbold Tsagaankhuu <ganbold@gmail.com> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* Simple UART console driver for Allwinner A10 */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/cons.h> +#include <sys/consio.h> +#include <sys/kernel.h> + +#ifndef A10_UART_BASE +#define A10_UART_BASE 0xe1c28000 /* UART0 */ +#endif + +int reg_shift = 2; + +#define UART_DLL 0 /* Out: Divisor Latch Low */ +#define UART_DLM 1 /* Out: Divisor Latch High */ +#define UART_FCR 2 /* Out: FIFO Control Register */ +#define UART_LCR 3 /* Out: Line Control Register */ +#define UART_MCR 4 /* Out: Modem Control Register */ +#define UART_LSR 5 /* In: Line Status Register */ +#define UART_LSR_THRE 0x20 /* Transmit-hold-register empty */ +#define UART_LSR_DR 0x01 /* Receiver data ready */ +#define UART_MSR 6 /* In: Modem Status Register */ +#define UART_SCR 7 /* I/O: Scratch Register */ + + +/* + * uart related funcs + */ +static u_int32_t +uart_getreg(u_int32_t *bas) +{ + return *((volatile u_int32_t *)(bas)) & 0xff; +} + +static void +uart_setreg(u_int32_t *bas, u_int32_t val) +{ + *((volatile u_int32_t *)(bas)) = (u_int32_t)val; +} + +static int +ub_getc(void) +{ + while ((uart_getreg((u_int32_t *)(A10_UART_BASE + + (UART_LSR << reg_shift))) & UART_LSR_DR) == 0); + __asm __volatile("nop"); + + return (uart_getreg((u_int32_t *)A10_UART_BASE) & 0xff); +} + +static void +ub_putc(unsigned char c) +{ + if (c == '\n') + ub_putc('\r'); + + while ((uart_getreg((u_int32_t *)(A10_UART_BASE + + (UART_LSR << reg_shift))) & UART_LSR_THRE) == 0) + __asm __volatile("nop"); + + uart_setreg((u_int32_t *)A10_UART_BASE, c); +} + +static cn_probe_t uart_cnprobe; +static cn_init_t uart_cninit; +static cn_term_t uart_cnterm; +static cn_getc_t uart_cngetc; +static cn_putc_t uart_cnputc; +static cn_grab_t uart_cngrab; +static cn_ungrab_t uart_cnungrab; + +static void +uart_cngrab(struct consdev *cp) +{ +} + +static void +uart_cnungrab(struct consdev *cp) +{ +} + + +static void +uart_cnprobe(struct consdev *cp) +{ + sprintf(cp->cn_name, "uart"); + cp->cn_pri = CN_NORMAL; +} + +static void +uart_cninit(struct consdev *cp) +{ + uart_setreg((u_int32_t *)(A10_UART_BASE + + (UART_FCR << reg_shift)), 0x06); +} + +void +uart_cnputc(struct consdev *cp, int c) +{ + ub_putc(c); +} + +int +uart_cngetc(struct consdev * cp) +{ + return ub_getc(); +} + +static void +uart_cnterm(struct consdev * cp) +{ +} + +CONSOLE_DRIVER(uart); + |
