1253f26158
Implement __flt_rounds for ARMv6 hard-float. The fpscr register stores the current rounding mode used by the VFP unit. Simplify how we build MACHINE_ARCH. There are 3 options that may be set however only arm, armeb, armv6, and soon armv6hf will be used. Add the llvm/clang patch for r263619. Reorder the pmap macros so "ARM_MMU_V6 + ARM_MMU_V7" is first. As they are identical this allows us to build for both v6 and v7 together. Add code for enabling second CPU core for A20 SoC. Enable SMP on Cubieboard2. Switch to freebsd.org emal address in copyright.
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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