/* $NetBSD: uart.c,v 1.12 2014/07/25 08:10:34 dholland Exp $ */ /*- * Copyright (c) 2007 Ruslan Ermilov and Vsevolod Lobko. * All rights reserved. * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * 3. The names of the authors may not be used to endorse or promote * products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY * OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: uart.c,v 1.12 2014/07/25 08:10:34 dholland Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define REG_READ(o) bus_space_read_4(sc->sc_st, sc->sc_ioh, (o)) #define REG_WRITE(o,v) bus_space_write_4(sc->sc_st, sc->sc_ioh, (o),(v)) cons_decl(uart_); dev_type_open(uart_open); dev_type_open(uart_close); dev_type_read(uart_read); dev_type_write(uart_write); dev_type_ioctl(uart_ioctl); dev_type_tty(uart_tty); dev_type_poll(uart_poll); dev_type_stop(uart_stop); const struct cdevsw uart_cdevsw = { .d_open = uart_open, .d_close = uart_close, .d_read = uart_read, .d_write = uart_write, .d_ioctl = uart_ioctl, .d_stop = uart_stop, .d_tty = uart_tty, .d_poll = uart_poll, .d_mmap = nommap, .d_kqfilter = ttykqfilter, .d_discard = nodiscard, .d_flag = D_TTY }; struct consdev uartcons = { .cn_getc = uart_cngetc, .cn_putc = uart_cnputc, .cn_pollc = uart_cnpollc, .cn_dev = NODEV, .cn_pri = CN_NORMAL }; struct uart_softc { device_t sc_dev; struct tty * sc_tty; bus_space_tag_t sc_st; bus_space_handle_t sc_ioh; void * sc_ih; }; extern struct cfdriver uart_cd; static int uart_consattached; static int uart_probe (device_t, cfdata_t, void *); static void uart_attach (device_t, device_t, void *); void uart_start(struct tty *); int uart_param(struct tty *, struct termios *); int uart_intr(void *); CFATTACH_DECL_NEW(uart, sizeof(struct uart_softc), uart_probe, uart_attach, NULL, NULL); static int uart_probe(device_t parent, cfdata_t cf, void *aux) { struct obio_attach_args * const oba = aux; if (strcmp(oba->oba_name, cf->cf_name) == 0) return (1); return (0); } static void uart_attach(device_t parent, device_t self, void *aux) { struct obio_attach_args * const oba = aux; struct uart_softc * const sc = device_private(self); struct tty *tp; int maj, minor; sc->sc_dev = self; sc->sc_st = oba->oba_st; if (bus_space_map(oba->oba_st, oba->oba_addr, 256, 0, &sc->sc_ioh)) { aprint_error("unable to map device\n"); return; } /* Establish the interrupt. */ sc->sc_ih = adm5120_intr_establish(oba->oba_irq, INTR_FIQ, uart_intr, sc); if (sc->sc_ih == NULL) { aprint_error("unable to establish interrupt\n"); return; } REG_WRITE(UART_CR_REG,UART_CR_PORT_EN|UART_CR_RX_INT_EN|UART_CR_RX_TIMEOUT_INT_EN); maj = cdevsw_lookup_major(&uart_cdevsw); minor = device_unit(sc->sc_dev); tp = tty_alloc(); tp->t_oproc = uart_start; tp->t_param = uart_param; sc->sc_tty = tp; tp->t_dev = makedev(maj, minor); tty_attach(tp); if (minor == 0 && uart_consattached) { /* attach as console*/ cn_tab->cn_dev = tp->t_dev; aprint_normal(" console"); } aprint_normal("\n"); } int uart_cnattach(void) { cn_tab = &uartcons; uart_consattached = 1; return (0); } void uart_cnputc(dev_t dev, int c) { while ((*((volatile unsigned long *)0xb2600018)) & 0x20) continue; (*((volatile unsigned long *)0xb2600000)) = c; } int uart_cngetc(dev_t dev) { while ((*((volatile unsigned long *)0xb2600018)) & 0x10) continue; return (*((volatile unsigned long *)0xb2600000)) & 0xff; } void uart_cnpollc(dev_t dev, int on) { } /* * TTY device */ int uart_open(dev_t dev, int flag, int mode, struct lwp *l) { struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); struct tty *tp = sc->sc_tty; int s, error = 0; s = spltty(); tp->t_dev = dev; if ((tp->t_state & TS_ISOPEN) == 0) { tp->t_state |= TS_CARR_ON; ttychars(tp); tp->t_iflag = TTYDEF_IFLAG; tp->t_oflag = TTYDEF_OFLAG; tp->t_cflag = TTYDEF_CFLAG | CLOCAL; tp->t_lflag = TTYDEF_LFLAG; tp->t_ispeed = tp->t_ospeed = 115200; ttsetwater(tp); } else if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp) != 0) { splx(s); return (EBUSY); } splx(s); error = (*tp->t_linesw->l_open)(dev, tp); return (error); } int uart_close(dev_t dev, int flag, int mode, struct lwp *l) { struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); struct tty *tp = sc->sc_tty; (*tp->t_linesw->l_close)(tp, flag); ttyclose(tp); return (0); } int uart_read(dev_t dev, struct uio *uio, int flag) { struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); struct tty *tp = sc->sc_tty; return ((*tp->t_linesw->l_read)(tp, uio, flag)); } int uart_write(dev_t dev, struct uio *uio, int flag) { struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); struct tty *tp = sc->sc_tty; return ((*tp->t_linesw->l_write)(tp, uio, flag)); } int uart_poll(dev_t dev, int events, struct lwp *l) { struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); struct tty *tp = sc->sc_tty; return ((*tp->t_linesw->l_poll)(tp, events, l)); } int uart_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) { struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); struct tty *tp = sc->sc_tty; int error; error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); if (error != EPASSTHROUGH) return (error); return (ttioctl(tp, cmd, data, flag, l)); } int uart_param(struct tty *tp, struct termios *t) { return (0); } struct tty* uart_tty(dev_t dev) { struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); return sc->sc_tty; } void uart_start(struct tty *tp) { int s,i,cnt; s = spltty(); if (tp->t_state & (TS_TTSTOP | TS_BUSY)) goto out; ttypull(tp); tp->t_state |= TS_BUSY; while (tp->t_outq.c_cc != 0) { cnt = ndqb(&tp->t_outq, 0); for (i=0; it_outq.c_cf[i]); ndflush(&tp->t_outq, cnt); } tp->t_state &= ~TS_BUSY; out: splx(s); } void uart_stop(struct tty *tp, int flag) { int s; s = spltty(); if (tp->t_state & TS_BUSY) if ((tp->t_state & TS_TTSTOP) == 0) tp->t_state |= TS_FLUSH; splx(s); } int uart_intr(void *v) { struct uart_softc *sc = v; struct tty *tp = sc->sc_tty; int c; if (REG_READ(UART_RSR_REG) & UART_RSR_BE) { REG_WRITE(UART_ECR_REG, UART_ECR_RSR); console_debugger(); } while ((REG_READ(UART_FR_REG) & UART_FR_RX_FIFO_EMPTY) == 0) { c = REG_READ(UART_DR_REG) & 0xff; if (tp->t_state & TS_ISOPEN) (*tp->t_linesw->l_rint)(c, tp); } return 0; }