143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/*-
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* Copyright (c) 2012 Ganbold Tsagaankhuu <ganbold@freebsd.org>
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* All rights reserved.
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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 Allwinner A10 */
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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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#ifndef A10_UART_BASE
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#define A10_UART_BASE 0xe1c28000 /* UART0 */
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#endif
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#define REG_SHIFT 2
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#define UART_DLL 0 /* Out: Divisor Latch Low */
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#define UART_DLM 1 /* Out: Divisor Latch High */
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#define UART_FCR 2 /* Out: FIFO Control Register */
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#define UART_LCR 3 /* Out: Line Control Register */
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#define UART_MCR 4 /* Out: Modem Control Register */
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#define UART_LSR 5 /* In: Line Status Register */
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#define UART_LSR_THRE 0x20 /* Transmit-hold-register empty */
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#define UART_LSR_DR 0x01 /* Receiver data ready */
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#define UART_MSR 6 /* In: Modem Status Register */
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#define UART_SCR 7 /* I/O: Scratch Register */
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static uint32_t
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uart_getreg(uint32_t *bas)
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{
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return *((volatile uint32_t *)(bas)) & 0xff;
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}
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static void
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uart_setreg(uint32_t *bas, uint32_t val)
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{
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*((volatile uint32_t *)(bas)) = val;
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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 ((uart_getreg((uint32_t *)(A10_UART_BASE +
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(UART_LSR << REG_SHIFT))) & UART_LSR_DR) == 0);
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__asm __volatile("nop");
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return (uart_getreg((uint32_t *)A10_UART_BASE) & 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 ((uart_getreg((uint32_t *)(A10_UART_BASE +
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(UART_LSR << REG_SHIFT))) & UART_LSR_THRE) == 0)
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__asm __volatile("nop");
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uart_setreg((uint32_t *)A10_UART_BASE, 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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uart_setreg((uint32_t *)(A10_UART_BASE +
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(UART_FCR << REG_SHIFT)), 0x06);
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}
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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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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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