06287620b4
precisely where locking would be needed before adding it, but it seems uart(4) draws slightly too much attention to have it without locking for too long. The lock added is a spinlock that protects access to the underlying hardware. As a first and obvious stab at this, each method of the hardware interface grabs the lock. Roughly speaking this serializes the methods. Exceptions are the probe, attach and detach methods.
224 lines
6.1 KiB
C
224 lines
6.1 KiB
C
/*
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* Copyright (c) 2003 Marcel Moolenaar
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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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* $FreeBSD$
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*/
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#ifndef _DEV_UART_BUS_H_
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#define _DEV_UART_BUS_H_
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#ifndef KLD_MODULE
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#include "opt_uart.h"
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#endif
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#include <sys/timepps.h>
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/* Drain and flush targets. */
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#define UART_DRAIN_RECEIVER 0x0001
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#define UART_DRAIN_TRANSMITTER 0x0002
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#define UART_FLUSH_RECEIVER UART_DRAIN_RECEIVER
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#define UART_FLUSH_TRANSMITTER UART_DRAIN_TRANSMITTER
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/*
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* Interrupt sources (in priority order). See also uart_core.c
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* Note that the low order 16 bits are used to pass modem signals
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* from the hardware interrupt handler to the software interrupt
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* handler. See UART_SIG_* and UART_SIGMASK_* below.
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*/
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#define UART_IPEND_OVERRUN 0x010000
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#define UART_IPEND_BREAK 0x020000
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#define UART_IPEND_RXREADY 0x040000
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#define UART_IPEND_SIGCHG 0x080000
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#define UART_IPEND_TXIDLE 0x100000
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#define UART_IPEND_MASK 0x1f0000
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#define UART_IPEND_SIGMASK 0x00ffff
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/* Received character status bits. */
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#define UART_STAT_BREAK 0x0100
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#define UART_STAT_FRAMERR 0x0200
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#define UART_STAT_OVERRUN 0x0400
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#define UART_STAT_PARERR 0x0800
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/* Modem and line signals. */
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#define UART_SIG_DTR 0x0001
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#define UART_SIG_RTS 0x0002
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#define UART_SIG_DSR 0x0004
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#define UART_SIG_CTS 0x0008
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#define UART_SIG_DCD 0x0010
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#define UART_SIG_RI 0x0020
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#define UART_SIG_DDTR 0x0100
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#define UART_SIG_DRTS 0x0200
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#define UART_SIG_DDSR 0x0400
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#define UART_SIG_DCTS 0x0800
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#define UART_SIG_DDCD 0x1000
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#define UART_SIG_DRI 0x2000
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#define UART_SIGMASK_DTE 0x0003
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#define UART_SIGMASK_DCE 0x003c
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#define UART_SIGMASK_STATE 0x003f
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#define UART_SIGMASK_DELTA 0x3f00
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#ifdef UART_PPS_ON_CTS
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#define UART_SIG_DPPS UART_SIG_DCTS
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#define UART_SIG_PPS UART_SIG_CTS
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#else
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#define UART_SIG_DPPS UART_SIG_DDCD
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#define UART_SIG_PPS UART_SIG_DCD
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#endif
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/* UART_IOCTL() requests */
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#define UART_IOCTL_BREAK 1
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#define UART_IOCTL_IFLOW 2
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#define UART_IOCTL_OFLOW 3
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/*
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* UART class & instance (=softc)
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*/
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struct uart_class {
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KOBJ_CLASS_FIELDS;
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u_int uc_range; /* Bus space address range. */
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u_int uc_rclk; /* Default rclk for this device. */
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};
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extern struct uart_class uart_ns8250_class;
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extern struct uart_class uart_sab82532_class;
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extern struct uart_class uart_z8530_class;
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struct uart_softc {
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KOBJ_FIELDS;
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struct uart_class *sc_class;
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struct uart_bas sc_bas;
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device_t sc_dev;
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struct mtx sc_hwmtx; /* Spinlock protecting hardware. */
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struct resource *sc_rres; /* Register resource. */
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int sc_rrid;
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int sc_rtype; /* SYS_RES_{IOPORT|MEMORY}. */
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struct resource *sc_ires; /* Interrupt resource. */
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void *sc_icookie;
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int sc_irid;
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int sc_callout:1; /* This UART is opened for callout. */
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int sc_fastintr:1; /* This UART uses fast interrupts. */
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int sc_hasfifo:1; /* This UART has FIFOs. */
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int sc_hwiflow:1; /* This UART has HW input flow ctl. */
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int sc_hwoflow:1; /* This UART has HW output flow ctl. */
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int sc_leaving:1; /* This UART is going away. */
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int sc_opened:1; /* This UART is open for business. */
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int sc_polled:1; /* This UART has no interrupts. */
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int sc_txbusy:1; /* This UART is transmitting. */
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struct uart_devinfo *sc_sysdev; /* System device (or NULL). */
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int sc_altbrk; /* State for alt break sequence. */
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uint32_t sc_hwsig; /* Signal state. Used by HW driver. */
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/* Receiver data. */
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uint16_t *sc_rxbuf;
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int sc_rxbufsz;
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int sc_rxput;
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int sc_rxget;
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int sc_rxfifosz; /* Size of RX FIFO. */
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/* Transmitter data. */
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uint8_t *sc_txbuf;
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int sc_txdatasz;
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int sc_txfifosz; /* Size of TX FIFO and buffer. */
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/* Pulse capturing support (PPS). */
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struct pps_state sc_pps;
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/* Upper layer data. */
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void *sc_softih;
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uint32_t sc_ttypend;
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union {
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/* TTY specific data. */
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struct {
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dev_t si[2]; /* We have 2 device special files. */
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struct tty *tp;
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} u_tty;
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/* Keyboard specific data. */
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struct {
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} u_kbd;
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} sc_u;
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};
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extern devclass_t uart_devclass;
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extern char uart_driver_name[];
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int uart_bus_attach(device_t dev);
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int uart_bus_detach(device_t dev);
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int uart_bus_probe(device_t dev, int regshft, int rclk, int rid);
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int uart_tty_attach(struct uart_softc *);
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int uart_tty_detach(struct uart_softc *);
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void uart_tty_intr(void *arg);
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/*
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* Receive buffer operations.
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*/
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static __inline int
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uart_rx_empty(struct uart_softc *sc)
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{
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return ((sc->sc_rxget == sc->sc_rxput) ? 1 : 0);
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}
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static __inline int
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uart_rx_full(struct uart_softc *sc)
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{
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return ((sc->sc_rxput + 1 < sc->sc_rxbufsz)
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? (sc->sc_rxput + 1 == sc->sc_rxget) : (sc->sc_rxget == 0));
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}
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static __inline int
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uart_rx_get(struct uart_softc *sc)
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{
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int ptr, xc;
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ptr = sc->sc_rxget;
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if (ptr == sc->sc_rxput)
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return (-1);
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xc = sc->sc_rxbuf[ptr++];
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sc->sc_rxget = (ptr < sc->sc_rxbufsz) ? ptr : 0;
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return (xc);
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}
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static __inline int
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uart_rx_put(struct uart_softc *sc, int xc)
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{
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int ptr;
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ptr = (sc->sc_rxput + 1 < sc->sc_rxbufsz) ? sc->sc_rxput + 1 : 0;
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if (ptr == sc->sc_rxget)
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return (ENOSPC);
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sc->sc_rxbuf[sc->sc_rxput] = xc;
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sc->sc_rxput = ptr;
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return (0);
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}
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#endif /* _DEV_UART_BUS_H_ */
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