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/*-
* Copyright (c) 2012, 2013 The FreeBSD Foundation
* All rights reserved.
*
* 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/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>
/* 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);
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