diff options
Diffstat (limited to 'sys/arm/freescale/imx/imx_console.c')
| -rw-r--r-- | sys/arm/freescale/imx/imx_console.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/sys/arm/freescale/imx/imx_console.c b/sys/arm/freescale/imx/imx_console.c new file mode 100644 index 000000000000..369b6921e41d --- /dev/null +++ b/sys/arm/freescale/imx/imx_console.c @@ -0,0 +1,172 @@ +/*- + * Copyright (c) 2012, 2013 The FreeBSD Foundation + * + * This software was developed by Oleksandr Rybalko under sponsorship + * from the FreeBSD Foundation. + * + * 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 Freescale i.MX515 */ + +#include <sys/types.h> +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/cons.h> +#include <sys/consio.h> +#include <sys/kernel.h> + +/* Allow it to be predefined, to be able to use another UART for console */ +#ifndef IMX_UART_BASE +#define IMX_UART_BASE 0xe3fbc000 /* imx51 UART1 */ +#endif + +#define IMX_RXD 0x00 +#define IMX_TXD 0x40 + +#define IMX_UFCR 0x90 +#define IMX_USR1 0x94 +#define IMX_USR1_TRDY (1 << 13) + +#define IMX_USR2 0x98 +#define IMX_USR2_RDR (1 << 0) +#define IMX_USR2_TXFE (1 << 14) +#define IMX_USR2_TXDC (1 << 3) + +#define IMX_UTS 0xb4 +#define IMX_UTS_TXFULL (1 << 4) + +/* + * The base address of the uart registers. + * + * This is global so that it can be changed on the fly from the outside. For + * example, set imx_uart_base=physaddr and then call cninit() as the first two + * lines of initarm() and enjoy printf() availability through the tricky bits of + * startup. After initarm() switches from physical to virtual addressing, just + * set imx_uart_base=virtaddr and printf keeps working. + */ +uint32_t imx_uart_base = IMX_UART_BASE; + +/* + * uart related funcs + */ +static uint32_t +ub_getreg(uint32_t off) +{ + + return *((volatile uint32_t *)(imx_uart_base + off)); +} + +static void +ub_setreg(uint32_t off, uint32_t val) +{ + + *((volatile uint32_t *)(imx_uart_base + off)) = val; +} + +static int +ub_tstc(void) +{ + + return ((ub_getreg(IMX_USR2) & IMX_USR2_RDR) ? 1 : 0); +} + +static int +ub_getc(void) +{ + + while (!ub_tstc()); + __asm __volatile("nop"); + + return (ub_getreg(IMX_RXD) & 0xff); +} + +static void +ub_putc(unsigned char c) +{ + + if (c == '\n') + ub_putc('\r'); + + while (ub_getreg(IMX_UTS) & IMX_UTS_TXFULL) + __asm __volatile("nop"); + + ub_setreg(IMX_TXD, 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) +{ + + /* Init fifo trigger levels to 32 bytes, refclock div to 2. */ + ub_setreg(IMX_UFCR, 0x00004210); +} + +static void +uart_cnputc(struct consdev *cp, int c) +{ + + ub_putc(c); +} + +static int +uart_cngetc(struct consdev * cp) +{ + + return ub_getc(); +} + +static void +uart_cnterm(struct consdev * cp) +{ + +} + +CONSOLE_DRIVER(uart); |