178 lines
4.0 KiB
C
178 lines
4.0 KiB
C
/*-
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* Copyright (c) 2012, 2013 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Oleksandr Rybalko under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* Simple UART console driver for Freescale i.MX515 */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/cons.h>
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#include <sys/consio.h>
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#include <sys/kernel.h>
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/* Allow it to be predefined, to be able to use another UART for console */
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#ifndef IMX_UART_BASE
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#define IMX_UART_BASE 0xe3fbc000 /* imx51 UART1 */
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#endif
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#define IMX_RXD 0x00
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#define IMX_TXD 0x40
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#define IMX_UFCR 0x90
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#define IMX_USR1 0x94
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#define IMX_USR1_TRDY (1 << 13)
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#define IMX_USR2 0x98
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#define IMX_USR2_RDR (1 << 0)
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#define IMX_USR2_TXFE (1 << 14)
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#define IMX_USR2_TXDC (1 << 3)
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#define IMX_UTS 0xb4
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#define IMX_UTS_TXFULL (1 << 4)
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/*
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* The base address of the uart registers.
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*
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* This is global so that it can be changed on the fly from the outside. For
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* example, set imx_uart_base=physaddr and then call cninit() as the first two
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* lines of initarm() and enjoy printf() availability through the tricky bits of
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* startup. After initarm() switches from physical to virtual addressing, just
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* set imx_uart_base=virtaddr and printf keeps working.
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*/
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uint32_t imx_uart_base = IMX_UART_BASE;
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/*
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* uart related funcs
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*/
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static uint32_t
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ub_getreg(uint32_t off)
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{
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return *((volatile uint32_t *)(imx_uart_base + off));
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}
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static void
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ub_setreg(uint32_t off, uint32_t val)
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{
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*((volatile uint32_t *)(imx_uart_base + off)) = val;
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}
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static int
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ub_tstc(void)
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{
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return ((ub_getreg(IMX_USR2) & IMX_USR2_RDR) ? 1 : 0);
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}
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static int
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ub_getc(void)
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{
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while (!ub_tstc());
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__asm __volatile("nop");
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return (ub_getreg(IMX_RXD) & 0xff);
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}
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static void
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ub_putc(unsigned char c)
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{
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if (c == '\n')
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ub_putc('\r');
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while (ub_getreg(IMX_UTS) & IMX_UTS_TXFULL)
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__asm __volatile("nop");
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ub_setreg(IMX_TXD, c);
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}
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static cn_probe_t uart_cnprobe;
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static cn_init_t uart_cninit;
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static cn_term_t uart_cnterm;
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static cn_getc_t uart_cngetc;
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static cn_putc_t uart_cnputc;
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static cn_grab_t uart_cngrab;
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static cn_ungrab_t uart_cnungrab;
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static void
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uart_cngrab(struct consdev *cp)
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{
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}
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static void
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uart_cnungrab(struct consdev *cp)
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{
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}
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static void
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uart_cnprobe(struct consdev *cp)
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{
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sprintf(cp->cn_name, "uart");
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cp->cn_pri = CN_NORMAL;
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}
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static void
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uart_cninit(struct consdev *cp)
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{
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/* Init fifo trigger levels to 32 bytes, refclock div to 2. */
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ub_setreg(IMX_UFCR, 0x00004210);
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}
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static void
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uart_cnputc(struct consdev *cp, int c)
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{
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ub_putc(c);
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}
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static int
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uart_cngetc(struct consdev * cp)
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{
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return ub_getc();
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}
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static void
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uart_cnterm(struct consdev * cp)
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{
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}
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CONSOLE_DRIVER(uart);
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