bdee30611d
for that argument. This will allow DDB to detect the broad category of reason why the debugger has been entered, which it can use for the purposes of deciding which DDB script to run. Assign approximate why values to all current consumers of the kdb_enter() interface.
674 lines
18 KiB
C
674 lines
18 KiB
C
/*-
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* Copyright (c) 2005 M. Warner Losh
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* Copyright (c) 2005 Olivier Houchard
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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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*
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_comconsole.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/cons.h>
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#include <sys/tty.h>
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#include <machine/bus.h>
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#include <dev/uart/uart.h>
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#include <dev/uart/uart_cpu.h>
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#include <dev/uart/uart_bus.h>
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#include <arm/at91/at91rm92reg.h>
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#include <arm/at91/at91_usartreg.h>
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#include <arm/at91/at91_pdcreg.h>
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#include "uart_if.h"
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#define DEFAULT_RCLK AT91C_MASTER_CLOCK
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#define USART_BUFFER_SIZE 128
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/*
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* High-level UART interface.
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*/
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struct at91_usart_rx {
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bus_addr_t pa;
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uint8_t buffer[USART_BUFFER_SIZE];
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bus_dmamap_t map;
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};
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struct at91_usart_softc {
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struct uart_softc base;
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bus_dma_tag_t dmatag; /* bus dma tag for mbufs */
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bus_dmamap_t tx_map;
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uint32_t flags;
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#define HAS_TIMEOUT 1
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struct at91_usart_rx ping_pong[2];
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struct at91_usart_rx *ping;
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struct at91_usart_rx *pong;
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};
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#define RD4(bas, reg) \
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bus_space_read_4((bas)->bst, (bas)->bsh, uart_regofs(bas, reg))
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#define WR4(bas, reg, value) \
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bus_space_write_4((bas)->bst, (bas)->bsh, uart_regofs(bas, reg), value)
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#define SIGCHG(c, i, s, d) \
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do { \
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if (c) { \
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i |= (i & s) ? s : s | d; \
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} else { \
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i = (i & s) ? (i & ~s) | d : i; \
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} \
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} while (0);
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#define BAUD2DIVISOR(b) \
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((((DEFAULT_RCLK * 10) / ((b) * 16)) + 5) / 10)
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/*
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* Low-level UART interface.
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*/
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static int at91_usart_probe(struct uart_bas *bas);
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static void at91_usart_init(struct uart_bas *bas, int, int, int, int);
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static void at91_usart_term(struct uart_bas *bas);
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static void at91_usart_putc(struct uart_bas *bas, int);
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static int at91_usart_rxready(struct uart_bas *bas);
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static int at91_usart_getc(struct uart_bas *bas, struct mtx *mtx);
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extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
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static int
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at91_usart_param(struct uart_bas *bas, int baudrate, int databits,
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int stopbits, int parity)
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{
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uint32_t mr;
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/*
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* Assume 3-write RS-232 configuration.
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* XXX Not sure how uart will present the other modes to us, so
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* XXX they are unimplemented. maybe ioctl?
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*/
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mr = USART_MR_MODE_NORMAL;
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mr |= USART_MR_USCLKS_MCK; /* Assume MCK */
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/*
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* Or in the databits requested
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*/
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if (databits < 9)
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mr &= ~USART_MR_MODE9;
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switch (databits) {
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case 5:
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mr |= USART_MR_CHRL_5BITS;
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break;
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case 6:
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mr |= USART_MR_CHRL_6BITS;
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break;
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case 7:
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mr |= USART_MR_CHRL_7BITS;
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break;
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case 8:
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mr |= USART_MR_CHRL_8BITS;
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break;
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case 9:
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mr |= USART_MR_CHRL_8BITS | USART_MR_MODE9;
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break;
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default:
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return (EINVAL);
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}
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/*
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* Or in the parity
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*/
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switch (parity) {
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case UART_PARITY_NONE:
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mr |= USART_MR_PAR_NONE;
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break;
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case UART_PARITY_ODD:
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mr |= USART_MR_PAR_ODD;
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break;
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case UART_PARITY_EVEN:
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mr |= USART_MR_PAR_EVEN;
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break;
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case UART_PARITY_MARK:
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mr |= USART_MR_PAR_MARK;
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break;
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case UART_PARITY_SPACE:
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mr |= USART_MR_PAR_SPACE;
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break;
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default:
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return (EINVAL);
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}
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/*
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* Or in the stop bits. Note: The hardware supports 1.5 stop
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* bits in async mode, but there's no way to specify that
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* AFAICT. Instead, rely on the convention documented at
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* http://www.lammertbies.nl/comm/info/RS-232_specs.html which
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* states that 1.5 stop bits are used for 5 bit bytes and
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* 2 stop bits only for longer bytes.
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*/
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if (stopbits == 1)
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mr |= USART_MR_NBSTOP_1;
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else if (databits > 5)
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mr |= USART_MR_NBSTOP_2;
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else
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mr |= USART_MR_NBSTOP_1_5;
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/*
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* We want normal plumbing mode too, none of this fancy
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* loopback or echo mode.
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*/
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mr |= USART_MR_CHMODE_NORMAL;
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mr &= ~USART_MR_MSBF; /* lsb first */
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mr &= ~USART_MR_CKLO_SCK; /* Don't drive SCK */
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WR4(bas, USART_MR, mr);
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/*
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* Set the baud rate
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*/
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WR4(bas, USART_BRGR, BAUD2DIVISOR(baudrate));
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/* XXX Need to take possible synchronous mode into account */
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return (0);
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}
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static struct uart_ops at91_usart_ops = {
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.probe = at91_usart_probe,
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.init = at91_usart_init,
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.term = at91_usart_term,
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.putc = at91_usart_putc,
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.rxready = at91_usart_rxready,
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.getc = at91_usart_getc,
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};
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static int
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at91_usart_probe(struct uart_bas *bas)
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{
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/* We know that this is always here */
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return (0);
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}
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/*
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* Initialize this device for use as a console.
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*/
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static void
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at91_usart_init(struct uart_bas *bas, int baudrate, int databits, int stopbits,
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int parity)
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{
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at91_usart_param(bas, baudrate, databits, stopbits, parity);
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/* Reset the rx and tx buffers and turn on rx and tx */
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WR4(bas, USART_CR, USART_CR_RSTSTA | USART_CR_RSTRX | USART_CR_RSTTX);
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WR4(bas, USART_CR, USART_CR_RXEN | USART_CR_TXEN);
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WR4(bas, USART_IDR, 0xffffffff);
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}
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/*
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* Free resources now that we're no longer the console. This appears to
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* be never called, and I'm unsure quite what to do if I am called.
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*/
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static void
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at91_usart_term(struct uart_bas *bas)
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{
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/* XXX */
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}
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/*
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* Put a character of console output (so we do it here polling rather than
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* interrutp driven).
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*/
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static void
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at91_usart_putc(struct uart_bas *bas, int c)
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{
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while (!(RD4(bas, USART_CSR) & USART_CSR_TXRDY))
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continue;
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WR4(bas, USART_THR, c);
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}
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/*
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* Check for a character available.
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*/
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static int
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at91_usart_rxready(struct uart_bas *bas)
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{
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return ((RD4(bas, USART_CSR) & USART_CSR_RXRDY) != 0 ? 1 : 0);
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}
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/*
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* Block waiting for a character.
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*/
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static int
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at91_usart_getc(struct uart_bas *bas, struct mtx *mtx)
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{
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int c;
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while (!(RD4(bas, USART_CSR) & USART_CSR_RXRDY))
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continue;
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c = RD4(bas, USART_RHR);
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c &= 0xff;
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return (c);
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}
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static int at91_usart_bus_probe(struct uart_softc *sc);
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static int at91_usart_bus_attach(struct uart_softc *sc);
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static int at91_usart_bus_flush(struct uart_softc *, int);
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static int at91_usart_bus_getsig(struct uart_softc *);
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static int at91_usart_bus_ioctl(struct uart_softc *, int, intptr_t);
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static int at91_usart_bus_ipend(struct uart_softc *);
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static int at91_usart_bus_param(struct uart_softc *, int, int, int, int);
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static int at91_usart_bus_receive(struct uart_softc *);
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static int at91_usart_bus_setsig(struct uart_softc *, int);
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static int at91_usart_bus_transmit(struct uart_softc *);
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static kobj_method_t at91_usart_methods[] = {
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KOBJMETHOD(uart_probe, at91_usart_bus_probe),
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KOBJMETHOD(uart_attach, at91_usart_bus_attach),
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KOBJMETHOD(uart_flush, at91_usart_bus_flush),
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KOBJMETHOD(uart_getsig, at91_usart_bus_getsig),
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KOBJMETHOD(uart_ioctl, at91_usart_bus_ioctl),
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KOBJMETHOD(uart_ipend, at91_usart_bus_ipend),
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KOBJMETHOD(uart_param, at91_usart_bus_param),
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KOBJMETHOD(uart_receive, at91_usart_bus_receive),
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KOBJMETHOD(uart_setsig, at91_usart_bus_setsig),
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KOBJMETHOD(uart_transmit, at91_usart_bus_transmit),
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{ 0, 0 }
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};
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int
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at91_usart_bus_probe(struct uart_softc *sc)
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{
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return (0);
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}
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#ifndef SKYEYE_WORKAROUNDS
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static void
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at91_getaddr(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
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{
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if (error != 0)
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return;
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*(bus_addr_t *)arg = segs[0].ds_addr;
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}
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#endif
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static int
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at91_usart_bus_attach(struct uart_softc *sc)
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{
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#ifndef SKYEYE_WORKAROUNDS
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int err;
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int i;
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#endif
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uint32_t cr;
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struct at91_usart_softc *atsc;
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atsc = (struct at91_usart_softc *)sc;
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/*
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* See if we have a TIMEOUT bit. We disable all interrupts as
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* a side effect. Boot loaders may have enabled them. Since
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* a TIMEOUT interrupt can't happen without other setup, the
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* apparent race here can't actually happen.
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*/
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WR4(&sc->sc_bas, USART_IDR, 0xffffffff);
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WR4(&sc->sc_bas, USART_IER, USART_CSR_TIMEOUT);
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if (RD4(&sc->sc_bas, USART_IMR) & USART_CSR_TIMEOUT)
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atsc->flags |= HAS_TIMEOUT;
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WR4(&sc->sc_bas, USART_IDR, 0xffffffff);
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sc->sc_txfifosz = USART_BUFFER_SIZE;
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sc->sc_rxfifosz = USART_BUFFER_SIZE;
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sc->sc_hwiflow = 0;
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#ifndef SKYEYE_WORKAROUNDS
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/*
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* Allocate DMA tags and maps
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*/
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err = bus_dma_tag_create(NULL, 1, 0, BUS_SPACE_MAXADDR_32BIT,
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BUS_SPACE_MAXADDR, NULL, NULL, USART_BUFFER_SIZE, 1,
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USART_BUFFER_SIZE, BUS_DMA_ALLOCNOW, NULL, NULL, &atsc->dmatag);
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if (err != 0)
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goto errout;
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err = bus_dmamap_create(atsc->dmatag, 0, &atsc->tx_map);
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if (err != 0)
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goto errout;
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if (atsc->flags & HAS_TIMEOUT) {
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for (i = 0; i < 2; i++) {
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err = bus_dmamap_create(atsc->dmatag, 0,
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&atsc->ping_pong[i].map);
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if (err != 0)
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goto errout;
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err = bus_dmamap_load(atsc->dmatag,
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atsc->ping_pong[i].map,
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atsc->ping_pong[i].buffer, sc->sc_rxfifosz,
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at91_getaddr, &atsc->ping_pong[i].pa, 0);
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if (err != 0)
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goto errout;
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bus_dmamap_sync(atsc->dmatag, atsc->ping_pong[i].map,
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BUS_DMASYNC_PREREAD);
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}
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atsc->ping = &atsc->ping_pong[0];
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atsc->pong = &atsc->ping_pong[1];
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}
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#endif
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/*
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* Prime the pump with the RX buffer. We use two 64 byte bounce
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* buffers here to avoid data overflow.
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*/
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/* Turn on rx and tx */
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cr = USART_CR_RSTSTA | USART_CR_RSTRX | USART_CR_RSTTX;
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WR4(&sc->sc_bas, USART_CR, cr);
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WR4(&sc->sc_bas, USART_CR, USART_CR_RXEN | USART_CR_TXEN);
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/*
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* Setup the PDC to receive data. We use the ping-pong buffers
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* so that we can more easily bounce between the two and so that
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* we get an interrupt 1/2 way through the software 'fifo' we have
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* to avoid overruns.
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*/
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if (atsc->flags & HAS_TIMEOUT) {
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WR4(&sc->sc_bas, PDC_RPR, atsc->ping->pa);
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WR4(&sc->sc_bas, PDC_RCR, sc->sc_rxfifosz);
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WR4(&sc->sc_bas, PDC_RNPR, atsc->pong->pa);
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WR4(&sc->sc_bas, PDC_RNCR, sc->sc_rxfifosz);
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WR4(&sc->sc_bas, PDC_PTCR, PDC_PTCR_RXTEN);
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/* Set the receive timeout to be 1.5 character times. */
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WR4(&sc->sc_bas, USART_RTOR, 12);
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WR4(&sc->sc_bas, USART_CR, USART_CR_STTTO);
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WR4(&sc->sc_bas, USART_IER, USART_CSR_TIMEOUT |
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USART_CSR_RXBUFF | USART_CSR_ENDRX);
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} else {
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WR4(&sc->sc_bas, USART_IER, USART_CSR_RXRDY);
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}
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WR4(&sc->sc_bas, USART_IER, USART_CSR_RXBRK);
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#ifndef SKYEYE_WORKAROUNDS
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errout:;
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// XXX bad
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return (err);
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#else
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return (0);
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#endif
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}
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static int
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at91_usart_bus_transmit(struct uart_softc *sc)
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{
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#ifndef SKYEYE_WORKAROUNDS
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bus_addr_t addr;
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#endif
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struct at91_usart_softc *atsc;
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atsc = (struct at91_usart_softc *)sc;
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#ifndef SKYEYE_WORKAROUNDS
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if (bus_dmamap_load(atsc->dmatag, atsc->tx_map, sc->sc_txbuf,
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sc->sc_txdatasz, at91_getaddr, &addr, 0) != 0)
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return (EAGAIN);
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bus_dmamap_sync(atsc->dmatag, atsc->tx_map, BUS_DMASYNC_PREWRITE);
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#endif
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uart_lock(sc->sc_hwmtx);
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sc->sc_txbusy = 1;
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#ifndef SKYEYE_WORKAROUNDS
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/*
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* Setup the PDC to transfer the data and interrupt us when it
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* is done. We've already requested the interrupt.
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*/
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WR4(&sc->sc_bas, PDC_TPR, addr);
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WR4(&sc->sc_bas, PDC_TCR, sc->sc_txdatasz);
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WR4(&sc->sc_bas, PDC_PTCR, PDC_PTCR_TXTEN);
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WR4(&sc->sc_bas, USART_IER, USART_CSR_ENDTX);
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uart_unlock(sc->sc_hwmtx);
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#else
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for (int i = 0; i < sc->sc_txdatasz; i++)
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at91_usart_putc(&sc->sc_bas, sc->sc_txbuf[i]);
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/*
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* XXX: Gross hack : Skyeye doesn't raise an interrupt once the
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* transfer is done, so simulate it.
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*/
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WR4(&sc->sc_bas, USART_IER, USART_CSR_TXRDY);
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#endif
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return (0);
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}
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static int
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at91_usart_bus_setsig(struct uart_softc *sc, int sig)
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{
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uint32_t new, old, cr;
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struct uart_bas *bas;
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do {
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old = sc->sc_hwsig;
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new = old;
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if (sig & SER_DDTR)
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SIGCHG(sig & SER_DTR, new, SER_DTR, SER_DDTR);
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if (sig & SER_DRTS)
|
|
SIGCHG(sig & SER_RTS, new, SER_RTS, SER_DRTS);
|
|
} while (!atomic_cmpset_32(&sc->sc_hwsig, old, new));
|
|
bas = &sc->sc_bas;
|
|
uart_lock(sc->sc_hwmtx);
|
|
cr = 0;
|
|
if (new & SER_DTR)
|
|
cr |= USART_CR_DTREN;
|
|
else
|
|
cr |= USART_CR_DTRDIS;
|
|
if (new & SER_RTS)
|
|
cr |= USART_CR_RTSEN;
|
|
else
|
|
cr |= USART_CR_RTSDIS;
|
|
WR4(bas, USART_CR, cr);
|
|
uart_unlock(sc->sc_hwmtx);
|
|
return (0);
|
|
}
|
|
static int
|
|
at91_usart_bus_receive(struct uart_softc *sc)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
static int
|
|
at91_usart_bus_param(struct uart_softc *sc, int baudrate, int databits,
|
|
int stopbits, int parity)
|
|
{
|
|
|
|
return (at91_usart_param(&sc->sc_bas, baudrate, databits, stopbits,
|
|
parity));
|
|
}
|
|
|
|
static __inline void
|
|
at91_rx_put(struct uart_softc *sc, int key)
|
|
{
|
|
#if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER)
|
|
if (sc->sc_sysdev != NULL && sc->sc_sysdev->type == UART_DEV_CONSOLE) {
|
|
if (kdb_alt_break(key, &sc->sc_altbrk))
|
|
kdb_enter(KDB_WHY_BREAK, "Break sequence to console");
|
|
}
|
|
#endif
|
|
uart_rx_put(sc, key);
|
|
}
|
|
|
|
static int
|
|
at91_usart_bus_ipend(struct uart_softc *sc)
|
|
{
|
|
int csr = RD4(&sc->sc_bas, USART_CSR);
|
|
int ipend = 0, i, len;
|
|
struct at91_usart_softc *atsc;
|
|
struct at91_usart_rx *p;
|
|
|
|
atsc = (struct at91_usart_softc *)sc;
|
|
if (csr & USART_CSR_ENDTX) {
|
|
bus_dmamap_sync(atsc->dmatag, atsc->tx_map,
|
|
BUS_DMASYNC_POSTWRITE);
|
|
bus_dmamap_unload(atsc->dmatag, atsc->tx_map);
|
|
}
|
|
uart_lock(sc->sc_hwmtx);
|
|
if (csr & USART_CSR_TXRDY) {
|
|
if (sc->sc_txbusy)
|
|
ipend |= SER_INT_TXIDLE;
|
|
WR4(&sc->sc_bas, USART_IDR, USART_CSR_TXRDY);
|
|
}
|
|
if (csr & USART_CSR_ENDTX) {
|
|
if (sc->sc_txbusy)
|
|
ipend |= SER_INT_TXIDLE;
|
|
WR4(&sc->sc_bas, USART_IDR, USART_CSR_ENDTX);
|
|
}
|
|
|
|
/*
|
|
* Due to the contraints of the DMA engine present in the
|
|
* atmel chip, I can't just say I have a rx interrupt pending
|
|
* and do all the work elsewhere. I need to look at the CSR
|
|
* bits right now and do things based on them to avoid races.
|
|
*/
|
|
if ((atsc->flags & HAS_TIMEOUT) && (csr & USART_CSR_RXBUFF)) {
|
|
// Have a buffer overflow. Copy all data from both
|
|
// ping and pong. Insert overflow character. Reset
|
|
// ping and pong and re-enable the PDC to receive
|
|
// characters again.
|
|
bus_dmamap_sync(atsc->dmatag, atsc->ping->map,
|
|
BUS_DMASYNC_POSTREAD);
|
|
bus_dmamap_sync(atsc->dmatag, atsc->pong->map,
|
|
BUS_DMASYNC_POSTREAD);
|
|
for (i = 0; i < sc->sc_rxfifosz; i++)
|
|
at91_rx_put(sc, atsc->ping->buffer[i]);
|
|
for (i = 0; i < sc->sc_rxfifosz; i++)
|
|
at91_rx_put(sc, atsc->pong->buffer[i]);
|
|
uart_rx_put(sc, UART_STAT_OVERRUN);
|
|
csr &= ~(USART_CSR_ENDRX | USART_CSR_TIMEOUT);
|
|
WR4(&sc->sc_bas, PDC_RPR, atsc->ping->pa);
|
|
WR4(&sc->sc_bas, PDC_RCR, sc->sc_rxfifosz);
|
|
WR4(&sc->sc_bas, PDC_RNPR, atsc->pong->pa);
|
|
WR4(&sc->sc_bas, PDC_RNCR, sc->sc_rxfifosz);
|
|
WR4(&sc->sc_bas, PDC_PTCR, PDC_PTCR_RXTEN);
|
|
ipend |= SER_INT_RXREADY;
|
|
}
|
|
if ((atsc->flags & HAS_TIMEOUT) && (csr & USART_CSR_ENDRX)) {
|
|
// Shuffle data from 'ping' of ping pong buffer, but
|
|
// leave current 'pong' in place, as it has become the
|
|
// new 'ping'. We need to copy data and setup the old
|
|
// 'ping' as the new 'pong' when we're done.
|
|
bus_dmamap_sync(atsc->dmatag, atsc->ping->map,
|
|
BUS_DMASYNC_POSTREAD);
|
|
for (i = 0; i < sc->sc_rxfifosz; i++)
|
|
at91_rx_put(sc, atsc->ping->buffer[i]);
|
|
p = atsc->ping;
|
|
atsc->ping = atsc->pong;
|
|
atsc->pong = p;
|
|
WR4(&sc->sc_bas, PDC_RNPR, atsc->pong->pa);
|
|
WR4(&sc->sc_bas, PDC_RNCR, sc->sc_rxfifosz);
|
|
ipend |= SER_INT_RXREADY;
|
|
}
|
|
if ((atsc->flags & HAS_TIMEOUT) && (csr & USART_CSR_TIMEOUT)) {
|
|
// We have one partial buffer. We need to stop the
|
|
// PDC, get the number of characters left and from
|
|
// that compute number of valid characters. We then
|
|
// need to reset ping and pong and reenable the PDC.
|
|
// Not sure if there's a race here at fast baud rates
|
|
// we need to worry about.
|
|
WR4(&sc->sc_bas, PDC_PTCR, PDC_PTCR_RXTDIS);
|
|
bus_dmamap_sync(atsc->dmatag, atsc->ping->map,
|
|
BUS_DMASYNC_POSTREAD);
|
|
len = sc->sc_rxfifosz - RD4(&sc->sc_bas, PDC_RCR);
|
|
for (i = 0; i < len; i++)
|
|
at91_rx_put(sc, atsc->ping->buffer[i]);
|
|
WR4(&sc->sc_bas, PDC_RPR, atsc->ping->pa);
|
|
WR4(&sc->sc_bas, PDC_RCR, sc->sc_rxfifosz);
|
|
WR4(&sc->sc_bas, USART_CR, USART_CR_STTTO);
|
|
WR4(&sc->sc_bas, PDC_PTCR, PDC_PTCR_RXTEN);
|
|
ipend |= SER_INT_RXREADY;
|
|
}
|
|
if (!(atsc->flags & HAS_TIMEOUT) && (csr & USART_CSR_RXRDY)) {
|
|
// We have another charater in a device that doesn't support
|
|
// timeouts, so we do it one character at a time.
|
|
at91_rx_put(sc, RD4(&sc->sc_bas, USART_RHR) & 0xff);
|
|
ipend |= SER_INT_RXREADY;
|
|
}
|
|
|
|
if (csr & USART_CSR_RXBRK) {
|
|
unsigned int cr = USART_CR_RSTSTA;
|
|
|
|
ipend |= SER_INT_BREAK;
|
|
WR4(&sc->sc_bas, USART_CR, cr);
|
|
}
|
|
uart_unlock(sc->sc_hwmtx);
|
|
return (ipend);
|
|
}
|
|
static int
|
|
at91_usart_bus_flush(struct uart_softc *sc, int what)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
at91_usart_bus_getsig(struct uart_softc *sc)
|
|
{
|
|
uint32_t new, sig;
|
|
uint8_t csr;
|
|
|
|
uart_lock(sc->sc_hwmtx);
|
|
csr = RD4(&sc->sc_bas, USART_CSR);
|
|
sig = 0;
|
|
if (csr & USART_CSR_CTS)
|
|
sig |= SER_CTS;
|
|
if (csr & USART_CSR_DCD)
|
|
sig |= SER_DCD;
|
|
if (csr & USART_CSR_DSR)
|
|
sig |= SER_DSR;
|
|
if (csr & USART_CSR_RI)
|
|
sig |= SER_RI;
|
|
new = sig & ~SER_MASK_DELTA;
|
|
sc->sc_hwsig = new;
|
|
uart_unlock(sc->sc_hwmtx);
|
|
return (sig);
|
|
}
|
|
|
|
static int
|
|
at91_usart_bus_ioctl(struct uart_softc *sc, int request, intptr_t data)
|
|
{
|
|
switch (request) {
|
|
case UART_IOCTL_BREAK:
|
|
case UART_IOCTL_IFLOW:
|
|
case UART_IOCTL_OFLOW:
|
|
break;
|
|
case UART_IOCTL_BAUD:
|
|
WR4(&sc->sc_bas, USART_BRGR, BAUD2DIVISOR(*(int *)data));
|
|
return (0);
|
|
}
|
|
return (EINVAL);
|
|
}
|
|
|
|
struct uart_class at91_usart_class = {
|
|
"at91_usart",
|
|
at91_usart_methods,
|
|
sizeof(struct at91_usart_softc),
|
|
.uc_ops = &at91_usart_ops,
|
|
.uc_range = 8,
|
|
.uc_rclk = DEFAULT_RCLK
|
|
};
|