/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2005 Olivier Houchard All rights reserved. * Copyright (c) 2012 Thomas Skibo All rights reserved. * Copyright (c) 2005 M. Warner Losh * * 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. * * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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. */ /* A driver for the Cadence AMBA UART as used by the Xilinx Zynq-7000. * * Reference: Zynq-7000 All Programmable SoC Technical Reference Manual. * (v1.4) November 16, 2012. Xilinx doc UG585. UART is covered in Ch. 19 * and register definitions are in appendix B.33. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include "uart_if.h" #define UART_FIFO_SIZE 64 #define RD4(bas, reg) \ bus_space_read_4((bas)->bst, (bas)->bsh, uart_regofs((bas), (reg))) #define WR4(bas, reg, value) \ bus_space_write_4((bas)->bst, (bas)->bsh, uart_regofs((bas), (reg)), \ (value)) /* Register definitions for Cadence UART Controller. */ #define CDNC_UART_CTRL_REG 0x00 /* Control Register. */ #define CDNC_UART_CTRL_REG_STOPBRK (1<<8) #define CDNC_UART_CTRL_REG_STARTBRK (1<<7) #define CDNC_UART_CTRL_REG_TORST (1<<6) #define CDNC_UART_CTRL_REG_TX_DIS (1<<5) #define CDNC_UART_CTRL_REG_TX_EN (1<<4) #define CDNC_UART_CTRL_REG_RX_DIS (1<<3) #define CDNC_UART_CTRL_REG_RX_EN (1<<2) #define CDNC_UART_CTRL_REG_TXRST (1<<1) #define CDNC_UART_CTRL_REG_RXRST (1<<0) #define CDNC_UART_MODE_REG 0x04 /* Mode Register. */ #define CDNC_UART_MODE_REG_CHMOD_R_LOOP (3<<8) /* [9:8] - channel mode */ #define CDNC_UART_MODE_REG_CHMOD_L_LOOP (2<<8) #define CDNC_UART_MODE_REG_CHMOD_AUTECHO (1<<8) #define CDNC_UART_MODE_REG_STOP2 (2<<6) /* [7:6] - stop bits */ #define CDNC_UART_MODE_REG_PAR_NONE (4<<3) /* [5:3] - parity type */ #define CDNC_UART_MODE_REG_PAR_MARK (3<<3) #define CDNC_UART_MODE_REG_PAR_SPACE (2<<3) #define CDNC_UART_MODE_REG_PAR_ODD (1<<3) #define CDNC_UART_MODE_REG_PAR_EVEN (0<<3) #define CDNC_UART_MODE_REG_6BIT (3<<1) /* [2:1] - character len */ #define CDNC_UART_MODE_REG_7BIT (2<<1) #define CDNC_UART_MODE_REG_8BIT (0<<1) #define CDNC_UART_MODE_REG_CLKSEL (1<<0) #define CDNC_UART_IEN_REG 0x08 /* Interrupt registers. */ #define CDNC_UART_IDIS_REG 0x0C #define CDNC_UART_IMASK_REG 0x10 #define CDNC_UART_ISTAT_REG 0x14 #define CDNC_UART_INT_TXOVR (1<<12) #define CDNC_UART_INT_TXNRLYFUL (1<<11) /* tx "nearly" full */ #define CDNC_UART_INT_TXTRIG (1<<10) #define CDNC_UART_INT_DMSI (1<<9) /* delta modem status */ #define CDNC_UART_INT_RXTMOUT (1<<8) #define CDNC_UART_INT_PARITY (1<<7) #define CDNC_UART_INT_FRAMING (1<<6) #define CDNC_UART_INT_RXOVR (1<<5) #define CDNC_UART_INT_TXFULL (1<<4) #define CDNC_UART_INT_TXEMPTY (1<<3) #define CDNC_UART_INT_RXFULL (1<<2) #define CDNC_UART_INT_RXEMPTY (1<<1) #define CDNC_UART_INT_RXTRIG (1<<0) #define CDNC_UART_INT_ALL 0x1FFF #define CDNC_UART_BAUDGEN_REG 0x18 #define CDNC_UART_RX_TIMEO_REG 0x1C #define CDNC_UART_RX_WATER_REG 0x20 #define CDNC_UART_MODEM_CTRL_REG 0x24 #define CDNC_UART_MODEM_CTRL_REG_FCM (1<<5) /* automatic flow control */ #define CDNC_UART_MODEM_CTRL_REG_RTS (1<<1) #define CDNC_UART_MODEM_CTRL_REG_DTR (1<<0) #define CDNC_UART_MODEM_STAT_REG 0x28 #define CDNC_UART_MODEM_STAT_REG_FCMS (1<<8) /* flow control mode (rw) */ #define CDNC_UART_MODEM_STAT_REG_DCD (1<<7) #define CDNC_UART_MODEM_STAT_REG_RI (1<<6) #define CDNC_UART_MODEM_STAT_REG_DSR (1<<5) #define CDNC_UART_MODEM_STAT_REG_CTS (1<<4) #define CDNC_UART_MODEM_STAT_REG_DDCD (1<<3) /* change in DCD (w1tc) */ #define CDNC_UART_MODEM_STAT_REG_TERI (1<<2) /* trail edge ring (w1tc) */ #define CDNC_UART_MODEM_STAT_REG_DDSR (1<<1) /* change in DSR (w1tc) */ #define CDNC_UART_MODEM_STAT_REG_DCTS (1<<0) /* change in CTS (w1tc) */ #define CDNC_UART_CHAN_STAT_REG 0x2C /* Channel status register. */ #define CDNC_UART_CHAN_STAT_REG_TXNRLYFUL (1<<14) /* tx "nearly" full */ #define CDNC_UART_CHAN_STAT_REG_TXTRIG (1<<13) #define CDNC_UART_CHAN_STAT_REG_FDELT (1<<12) #define CDNC_UART_CHAN_STAT_REG_TXACTIVE (1<<11) #define CDNC_UART_CHAN_STAT_REG_RXACTIVE (1<<10) #define CDNC_UART_CHAN_STAT_REG_TXFULL (1<<4) #define CDNC_UART_CHAN_STAT_REG_TXEMPTY (1<<3) #define CDNC_UART_CHAN_STAT_REG_RXEMPTY (1<<1) #define CDNC_UART_CHAN_STAT_REG_RXTRIG (1<<0) #define CDNC_UART_FIFO 0x30 /* Data FIFO (tx and rx) */ #define CDNC_UART_BAUDDIV_REG 0x34 #define CDNC_UART_FLOWDEL_REG 0x38 #define CDNC_UART_TX_WATER_REG 0x44 /* * Low-level UART interface. */ static int cdnc_uart_probe(struct uart_bas *bas); static void cdnc_uart_init(struct uart_bas *bas, int, int, int, int); static void cdnc_uart_term(struct uart_bas *bas); static void cdnc_uart_putc(struct uart_bas *bas, int); static int cdnc_uart_rxready(struct uart_bas *bas); static int cdnc_uart_getc(struct uart_bas *bas, struct mtx *mtx); extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs; static struct uart_ops cdnc_uart_ops = { .probe = cdnc_uart_probe, .init = cdnc_uart_init, .term = cdnc_uart_term, .putc = cdnc_uart_putc, .rxready = cdnc_uart_rxready, .getc = cdnc_uart_getc, }; #define SIGCHG(c, i, s, d) \ if (c) { \ i |= (i & s) ? s : s | d; \ } else { \ i = (i & s) ? (i & ~s) | d : i; \ } static int cdnc_uart_probe(struct uart_bas *bas) { return (0); } static int cdnc_uart_set_baud(struct uart_bas *bas, int baudrate) { uint32_t baudgen, bauddiv; uint32_t best_bauddiv, best_baudgen, best_error; uint32_t baud_out, err; best_bauddiv = 0; best_baudgen = 0; best_error = ~0; /* Try all possible bauddiv values and pick best match. */ for (bauddiv = 4; bauddiv <= 255; bauddiv++) { baudgen = (bas->rclk + (baudrate * (bauddiv + 1)) / 2) / (baudrate * (bauddiv + 1)); if (baudgen < 1 || baudgen > 0xffff) continue; baud_out = bas->rclk / (baudgen * (bauddiv + 1)); err = baud_out > baudrate ? baud_out - baudrate : baudrate - baud_out; if (err < best_error) { best_error = err; best_bauddiv = bauddiv; best_baudgen = baudgen; } } if (best_bauddiv > 0) { WR4(bas, CDNC_UART_BAUDDIV_REG, best_bauddiv); WR4(bas, CDNC_UART_BAUDGEN_REG, best_baudgen); return (0); } else return (-1); /* out of range */ } static int cdnc_uart_set_params(struct uart_bas *bas, int baudrate, int databits, int stopbits, int parity) { uint32_t mode_reg_value = 0; switch (databits) { case 6: mode_reg_value |= CDNC_UART_MODE_REG_6BIT; break; case 7: mode_reg_value |= CDNC_UART_MODE_REG_7BIT; break; case 8: default: mode_reg_value |= CDNC_UART_MODE_REG_8BIT; break; } if (stopbits == 2) mode_reg_value |= CDNC_UART_MODE_REG_STOP2; switch (parity) { case UART_PARITY_MARK: mode_reg_value |= CDNC_UART_MODE_REG_PAR_MARK; break; case UART_PARITY_SPACE: mode_reg_value |= CDNC_UART_MODE_REG_PAR_SPACE; break; case UART_PARITY_ODD: mode_reg_value |= CDNC_UART_MODE_REG_PAR_ODD; break; case UART_PARITY_EVEN: mode_reg_value |= CDNC_UART_MODE_REG_PAR_EVEN; break; case UART_PARITY_NONE: default: mode_reg_value |= CDNC_UART_MODE_REG_PAR_NONE; break; } WR4(bas, CDNC_UART_MODE_REG, mode_reg_value); if (baudrate > 0 && cdnc_uart_set_baud(bas, baudrate) < 0) return (EINVAL); return(0); } static void cdnc_uart_hw_init(struct uart_bas *bas) { /* Reset RX and TX. */ WR4(bas, CDNC_UART_CTRL_REG, CDNC_UART_CTRL_REG_RXRST | CDNC_UART_CTRL_REG_TXRST); /* Interrupts all off. */ WR4(bas, CDNC_UART_IDIS_REG, CDNC_UART_INT_ALL); WR4(bas, CDNC_UART_ISTAT_REG, CDNC_UART_INT_ALL); /* Clear delta bits. */ WR4(bas, CDNC_UART_MODEM_STAT_REG, CDNC_UART_MODEM_STAT_REG_DDCD | CDNC_UART_MODEM_STAT_REG_TERI | CDNC_UART_MODEM_STAT_REG_DDSR | CDNC_UART_MODEM_STAT_REG_DCTS); /* RX FIFO water level, stale timeout */ WR4(bas, CDNC_UART_RX_WATER_REG, UART_FIFO_SIZE/2); WR4(bas, CDNC_UART_RX_TIMEO_REG, 10); /* TX FIFO water level (not used.) */ WR4(bas, CDNC_UART_TX_WATER_REG, UART_FIFO_SIZE/2); /* Bring RX and TX online. */ WR4(bas, CDNC_UART_CTRL_REG, CDNC_UART_CTRL_REG_RX_EN | CDNC_UART_CTRL_REG_TX_EN | CDNC_UART_CTRL_REG_TORST | CDNC_UART_CTRL_REG_STOPBRK); /* Set DTR and RTS. */ WR4(bas, CDNC_UART_MODEM_CTRL_REG, CDNC_UART_MODEM_CTRL_REG_DTR | CDNC_UART_MODEM_CTRL_REG_RTS); } /* * Initialize this device for use as a console. */ static void cdnc_uart_init(struct uart_bas *bas, int baudrate, int databits, int stopbits, int parity) { /* Initialize hardware. */ cdnc_uart_hw_init(bas); /* Set baudrate, parameters. */ (void)cdnc_uart_set_params(bas, baudrate, databits, stopbits, parity); } /* * Free resources now that we're no longer the console. This appears to * be never called, and I'm unsure quite what to do if I am called. */ static void cdnc_uart_term(struct uart_bas *bas) { /* XXX */ } /* * Put a character of console output (so we do it here polling rather than * interrupt driven). */ static void cdnc_uart_putc(struct uart_bas *bas, int c) { /* Wait for room. */ while ((RD4(bas,CDNC_UART_CHAN_STAT_REG) & CDNC_UART_CHAN_STAT_REG_TXFULL) != 0) ; WR4(bas, CDNC_UART_FIFO, c); while ((RD4(bas,CDNC_UART_CHAN_STAT_REG) & CDNC_UART_CHAN_STAT_REG_TXEMPTY) == 0) ; } /* * Check for a character available. */ static int cdnc_uart_rxready(struct uart_bas *bas) { return ((RD4(bas, CDNC_UART_CHAN_STAT_REG) & CDNC_UART_CHAN_STAT_REG_RXEMPTY) == 0); } /* * Block waiting for a character. */ static int cdnc_uart_getc(struct uart_bas *bas, struct mtx *mtx) { int c; uart_lock(mtx); while ((RD4(bas, CDNC_UART_CHAN_STAT_REG) & CDNC_UART_CHAN_STAT_REG_RXEMPTY) != 0) { uart_unlock(mtx); DELAY(4); uart_lock(mtx); } c = RD4(bas, CDNC_UART_FIFO); uart_unlock(mtx); c &= 0xff; return (c); } /*****************************************************************************/ /* * High-level UART interface. */ static int cdnc_uart_bus_probe(struct uart_softc *sc); static int cdnc_uart_bus_attach(struct uart_softc *sc); static int cdnc_uart_bus_flush(struct uart_softc *, int); static int cdnc_uart_bus_getsig(struct uart_softc *); static int cdnc_uart_bus_ioctl(struct uart_softc *, int, intptr_t); static int cdnc_uart_bus_ipend(struct uart_softc *); static int cdnc_uart_bus_param(struct uart_softc *, int, int, int, int); static int cdnc_uart_bus_receive(struct uart_softc *); static int cdnc_uart_bus_setsig(struct uart_softc *, int); static int cdnc_uart_bus_transmit(struct uart_softc *); static void cdnc_uart_bus_grab(struct uart_softc *); static void cdnc_uart_bus_ungrab(struct uart_softc *); static kobj_method_t cdnc_uart_bus_methods[] = { KOBJMETHOD(uart_probe, cdnc_uart_bus_probe), KOBJMETHOD(uart_attach, cdnc_uart_bus_attach), KOBJMETHOD(uart_flush, cdnc_uart_bus_flush), KOBJMETHOD(uart_getsig, cdnc_uart_bus_getsig), KOBJMETHOD(uart_ioctl, cdnc_uart_bus_ioctl), KOBJMETHOD(uart_ipend, cdnc_uart_bus_ipend), KOBJMETHOD(uart_param, cdnc_uart_bus_param), KOBJMETHOD(uart_receive, cdnc_uart_bus_receive), KOBJMETHOD(uart_setsig, cdnc_uart_bus_setsig), KOBJMETHOD(uart_transmit, cdnc_uart_bus_transmit), KOBJMETHOD(uart_grab, cdnc_uart_bus_grab), KOBJMETHOD(uart_ungrab, cdnc_uart_bus_ungrab), KOBJMETHOD_END }; int cdnc_uart_bus_probe(struct uart_softc *sc) { sc->sc_txfifosz = UART_FIFO_SIZE; sc->sc_rxfifosz = UART_FIFO_SIZE; sc->sc_hwiflow = 0; sc->sc_hwoflow = 0; device_set_desc(sc->sc_dev, "Cadence UART"); return (0); } static int cdnc_uart_bus_attach(struct uart_softc *sc) { struct uart_bas *bas = &sc->sc_bas; struct uart_devinfo *di; if (sc->sc_sysdev != NULL) { di = sc->sc_sysdev; (void)cdnc_uart_set_params(bas, di->baudrate, di->databits, di->stopbits, di->parity); } else cdnc_uart_hw_init(bas); (void)cdnc_uart_bus_getsig(sc); /* Enable interrupts. */ WR4(bas, CDNC_UART_IEN_REG, CDNC_UART_INT_RXTRIG | CDNC_UART_INT_RXTMOUT | CDNC_UART_INT_TXOVR | CDNC_UART_INT_RXOVR | CDNC_UART_INT_DMSI); return (0); } static int cdnc_uart_bus_transmit(struct uart_softc *sc) { int i; struct uart_bas *bas = &sc->sc_bas; uart_lock(sc->sc_hwmtx); /* Clear sticky TXEMPTY status bit. */ WR4(bas, CDNC_UART_ISTAT_REG, CDNC_UART_INT_TXEMPTY); for (i = 0; i < sc->sc_txdatasz; i++) WR4(bas, CDNC_UART_FIFO, sc->sc_txbuf[i]); /* Enable TX empty interrupt. */ WR4(bas, CDNC_UART_IEN_REG, CDNC_UART_INT_TXEMPTY); sc->sc_txbusy = 1; uart_unlock(sc->sc_hwmtx); return (0); } static int cdnc_uart_bus_setsig(struct uart_softc *sc, int sig) { struct uart_bas *bas = &sc->sc_bas; uint32_t new, old, modem_ctrl; do { old = sc->sc_hwsig; new = old; if (sig & SER_DDTR) { SIGCHG(sig & SER_DTR, new, SER_DTR, SER_DDTR); } if (sig & SER_DRTS) { SIGCHG(sig & SER_RTS, new, SER_RTS, SER_DRTS); } } while (!atomic_cmpset_32(&sc->sc_hwsig, old, new)); uart_lock(sc->sc_hwmtx); modem_ctrl = RD4(bas, CDNC_UART_MODEM_CTRL_REG) & ~(CDNC_UART_MODEM_CTRL_REG_DTR | CDNC_UART_MODEM_CTRL_REG_RTS); if ((new & SER_DTR) != 0) modem_ctrl |= CDNC_UART_MODEM_CTRL_REG_DTR; if ((new & SER_RTS) != 0) modem_ctrl |= CDNC_UART_MODEM_CTRL_REG_RTS; WR4(bas, CDNC_UART_MODEM_CTRL_REG, modem_ctrl); uart_unlock(sc->sc_hwmtx); return (0); } static int cdnc_uart_bus_receive(struct uart_softc *sc) { struct uart_bas *bas = &sc->sc_bas; uint32_t status; int c, c_status = 0; uart_lock(sc->sc_hwmtx); /* Check for parity or framing errors and clear the status bits. */ status = RD4(bas, CDNC_UART_ISTAT_REG); if ((status & (CDNC_UART_INT_FRAMING | CDNC_UART_INT_PARITY)) != 0) { WR4(bas, CDNC_UART_ISTAT_REG, status & (CDNC_UART_INT_FRAMING | CDNC_UART_INT_PARITY)); if ((status & CDNC_UART_INT_PARITY) != 0) c_status |= UART_STAT_PARERR; if ((status & CDNC_UART_INT_FRAMING) != 0) c_status |= UART_STAT_FRAMERR; } while ((RD4(bas, CDNC_UART_CHAN_STAT_REG) & CDNC_UART_CHAN_STAT_REG_RXEMPTY) == 0) { c = RD4(bas, CDNC_UART_FIFO) & 0xff; #ifdef KDB /* Detect break and drop into debugger. */ if (c == 0 && (c_status & UART_STAT_FRAMERR) != 0 && sc->sc_sysdev != NULL && sc->sc_sysdev->type == UART_DEV_CONSOLE) { kdb_break(); WR4(bas, CDNC_UART_ISTAT_REG, CDNC_UART_INT_FRAMING); } #endif uart_rx_put(sc, c | c_status); } uart_unlock(sc->sc_hwmtx); return (0); } static int cdnc_uart_bus_param(struct uart_softc *sc, int baudrate, int databits, int stopbits, int parity) { return (cdnc_uart_set_params(&sc->sc_bas, baudrate, databits, stopbits, parity)); } static int cdnc_uart_bus_ipend(struct uart_softc *sc) { int ipend = 0; struct uart_bas *bas = &sc->sc_bas; uint32_t istatus; uart_lock(sc->sc_hwmtx); istatus = RD4(bas, CDNC_UART_ISTAT_REG); /* Clear interrupt bits. */ WR4(bas, CDNC_UART_ISTAT_REG, istatus & (CDNC_UART_INT_RXTRIG | CDNC_UART_INT_RXTMOUT | CDNC_UART_INT_TXOVR | CDNC_UART_INT_RXOVR | CDNC_UART_INT_TXEMPTY | CDNC_UART_INT_DMSI)); /* Receive data. */ if ((istatus & (CDNC_UART_INT_RXTRIG | CDNC_UART_INT_RXTMOUT)) != 0) ipend |= SER_INT_RXREADY; /* Transmit fifo empty. */ if (sc->sc_txbusy && (istatus & CDNC_UART_INT_TXEMPTY) != 0) { /* disable txempty interrupt. */ WR4(bas, CDNC_UART_IDIS_REG, CDNC_UART_INT_TXEMPTY); ipend |= SER_INT_TXIDLE; } /* TX Overflow. */ if ((istatus & CDNC_UART_INT_TXOVR) != 0) ipend |= SER_INT_OVERRUN; /* RX Overflow. */ if ((istatus & CDNC_UART_INT_RXOVR) != 0) ipend |= SER_INT_OVERRUN; /* Modem signal change. */ if ((istatus & CDNC_UART_INT_DMSI) != 0) { WR4(bas, CDNC_UART_MODEM_STAT_REG, CDNC_UART_MODEM_STAT_REG_DDCD | CDNC_UART_MODEM_STAT_REG_TERI | CDNC_UART_MODEM_STAT_REG_DDSR | CDNC_UART_MODEM_STAT_REG_DCTS); ipend |= SER_INT_SIGCHG; } uart_unlock(sc->sc_hwmtx); return (ipend); } static int cdnc_uart_bus_flush(struct uart_softc *sc, int what) { return (0); } static int cdnc_uart_bus_getsig(struct uart_softc *sc) { struct uart_bas *bas = &sc->sc_bas; uint32_t new, old, sig; uint8_t modem_status; do { old = sc->sc_hwsig; sig = old; uart_lock(sc->sc_hwmtx); modem_status = RD4(bas, CDNC_UART_MODEM_STAT_REG); uart_unlock(sc->sc_hwmtx); SIGCHG(modem_status & CDNC_UART_MODEM_STAT_REG_DSR, sig, SER_DSR, SER_DDSR); SIGCHG(modem_status & CDNC_UART_MODEM_STAT_REG_CTS, sig, SER_CTS, SER_DCTS); SIGCHG(modem_status & CDNC_UART_MODEM_STAT_REG_DCD, sig, SER_DCD, SER_DDCD); SIGCHG(modem_status & CDNC_UART_MODEM_STAT_REG_RI, sig, SER_RI, SER_DRI); new = sig & ~SER_MASK_DELTA; } while (!atomic_cmpset_32(&sc->sc_hwsig, old, new)); return (sig); } static int cdnc_uart_bus_ioctl(struct uart_softc *sc, int request, intptr_t data) { struct uart_bas *bas = &sc->sc_bas; uint32_t uart_ctrl, modem_ctrl; int error = 0; uart_lock(sc->sc_hwmtx); switch (request) { case UART_IOCTL_BREAK: uart_ctrl = RD4(bas, CDNC_UART_CTRL_REG); if (data) { uart_ctrl |= CDNC_UART_CTRL_REG_STARTBRK; uart_ctrl &= ~CDNC_UART_CTRL_REG_STOPBRK; } else { uart_ctrl |= CDNC_UART_CTRL_REG_STOPBRK; uart_ctrl &= ~CDNC_UART_CTRL_REG_STARTBRK; } WR4(bas, CDNC_UART_CTRL_REG, uart_ctrl); break; case UART_IOCTL_IFLOW: modem_ctrl = RD4(bas, CDNC_UART_MODEM_CTRL_REG); if (data) modem_ctrl |= CDNC_UART_MODEM_CTRL_REG_RTS; else modem_ctrl &= ~CDNC_UART_MODEM_CTRL_REG_RTS; WR4(bas, CDNC_UART_MODEM_CTRL_REG, modem_ctrl); break; default: error = EINVAL; break; } uart_unlock(sc->sc_hwmtx); return (error); } static void cdnc_uart_bus_grab(struct uart_softc *sc) { /* Enable interrupts. */ WR4(&sc->sc_bas, CDNC_UART_IEN_REG, CDNC_UART_INT_TXOVR | CDNC_UART_INT_RXOVR | CDNC_UART_INT_DMSI); } static void cdnc_uart_bus_ungrab(struct uart_softc *sc) { /* Enable interrupts. */ WR4(&sc->sc_bas, CDNC_UART_IEN_REG, CDNC_UART_INT_RXTRIG | CDNC_UART_INT_RXTMOUT | CDNC_UART_INT_TXOVR | CDNC_UART_INT_RXOVR | CDNC_UART_INT_DMSI); } static struct uart_class uart_cdnc_class = { "cdnc_uart", cdnc_uart_bus_methods, sizeof(struct uart_softc), .uc_ops = &cdnc_uart_ops, .uc_range = 8 }; static struct ofw_compat_data compat_data[] = { {"cadence,uart", (uintptr_t)&uart_cdnc_class}, {"cdns,uart-r1p12", (uintptr_t)&uart_cdnc_class}, {"xlnx,xuartps", (uintptr_t)&uart_cdnc_class}, {NULL, (uintptr_t)NULL}, }; UART_FDT_CLASS_AND_DEVICE(compat_data);