/*- * Copyright (c) 2016 Michal Meloun * 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. * * THIS SOFTWARE IS PROVIDED BY THE 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 THE 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. */ #include /* * UART driver for Tegra SoCs. */ #include "opt_platform.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "uart_if.h" /* * High-level UART interface. */ struct tegra_softc { struct ns8250_softc ns8250_base; clk_t clk; hwreset_t reset; }; /* * UART class interface. */ static int tegra_uart_attach(struct uart_softc *sc) { int rv; struct ns8250_softc *ns8250 = (struct ns8250_softc*)sc; struct uart_bas *bas = &sc->sc_bas; rv = ns8250_bus_attach(sc); if (rv != 0) return (rv); ns8250->ier_rxbits = 0x1d; ns8250->ier_mask = 0xc0; ns8250->ier = uart_getreg(bas, REG_IER) & ns8250->ier_mask; ns8250->ier |= ns8250->ier_rxbits; uart_setreg(bas, REG_IER, ns8250->ier); uart_barrier(bas); return (0); } static void tegra_uart_grab(struct uart_softc *sc) { struct uart_bas *bas = &sc->sc_bas; struct ns8250_softc *ns8250 = (struct ns8250_softc*)sc; u_char ier; /* * turn off all interrupts to enter polling mode. Leave the * saved mask alone. We'll restore whatever it was in ungrab. * All pending interrupt signals are reset when IER is set to 0. */ uart_lock(sc->sc_hwmtx); ier = uart_getreg(bas, REG_IER); uart_setreg(bas, REG_IER, ier & ns8250->ier_mask); while ((uart_getreg(bas, REG_LSR) & LSR_TEMT) == 0) ; uart_setreg(bas, REG_FCR, 0); uart_barrier(bas); uart_unlock(sc->sc_hwmtx); } static void tegra_uart_ungrab(struct uart_softc *sc) { struct ns8250_softc *ns8250 = (struct ns8250_softc*)sc; struct uart_bas *bas = &sc->sc_bas; /* * Restore previous interrupt mask */ uart_lock(sc->sc_hwmtx); uart_setreg(bas, REG_FCR, ns8250->fcr); uart_setreg(bas, REG_IER, ns8250->ier); uart_barrier(bas); uart_unlock(sc->sc_hwmtx); } static kobj_method_t tegra_methods[] = { KOBJMETHOD(uart_probe, ns8250_bus_probe), KOBJMETHOD(uart_attach, tegra_uart_attach), KOBJMETHOD(uart_detach, ns8250_bus_detach), KOBJMETHOD(uart_flush, ns8250_bus_flush), KOBJMETHOD(uart_getsig, ns8250_bus_getsig), KOBJMETHOD(uart_ioctl, ns8250_bus_ioctl), KOBJMETHOD(uart_ipend, ns8250_bus_ipend), KOBJMETHOD(uart_param, ns8250_bus_param), KOBJMETHOD(uart_receive, ns8250_bus_receive), KOBJMETHOD(uart_setsig, ns8250_bus_setsig), KOBJMETHOD(uart_transmit, ns8250_bus_transmit), KOBJMETHOD(uart_grab, tegra_uart_grab), KOBJMETHOD(uart_ungrab, tegra_uart_ungrab), KOBJMETHOD_END }; static struct uart_class tegra_uart_class = { "tegra class", tegra_methods, sizeof(struct tegra_softc), .uc_ops = &uart_ns8250_ops, .uc_range = 8, .uc_rclk = 0, }; /* Compatible devices. */ static struct ofw_compat_data compat_data[] = { {"nvidia,tegra124-uart", (uintptr_t)&tegra_uart_class}, {"nvidia,tegra210-uart", (uintptr_t)&tegra_uart_class}, {NULL, (uintptr_t)NULL}, }; UART_FDT_CLASS(compat_data); /* * UART Driver interface. */ static int uart_fdt_get_shift1(phandle_t node) { pcell_t shift; if ((OF_getencprop(node, "reg-shift", &shift, sizeof(shift))) <= 0) shift = 2; return ((int)shift); } static int tegra_uart_probe(device_t dev) { struct tegra_softc *sc; phandle_t node; uint64_t freq; int shift; int rv; const struct ofw_compat_data *cd; sc = device_get_softc(dev); if (!ofw_bus_status_okay(dev)) return (ENXIO); cd = ofw_bus_search_compatible(dev, compat_data); if (cd->ocd_data == 0) return (ENXIO); sc->ns8250_base.base.sc_class = (struct uart_class *)cd->ocd_data; rv = hwreset_get_by_ofw_name(dev, 0, "serial", &sc->reset); if (rv != 0) { device_printf(dev, "Cannot get 'serial' reset\n"); return (ENXIO); } rv = hwreset_deassert(sc->reset); if (rv != 0) { device_printf(dev, "Cannot unreset 'serial' reset\n"); return (ENXIO); } node = ofw_bus_get_node(dev); shift = uart_fdt_get_shift1(node); rv = clk_get_by_ofw_index(dev, 0, 0, &sc->clk); if (rv != 0) { device_printf(dev, "Cannot get UART clock: %d\n", rv); return (ENXIO); } rv = clk_enable(sc->clk); if (rv != 0) { device_printf(dev, "Cannot enable UART clock: %d\n", rv); return (ENXIO); } rv = clk_get_freq(sc->clk, &freq); if (rv != 0) { device_printf(dev, "Cannot enable UART clock: %d\n", rv); return (ENXIO); } return (uart_bus_probe(dev, shift, 0, (int)freq, 0, 0, 0)); } static int tegra_uart_detach(device_t dev) { struct tegra_softc *sc; sc = device_get_softc(dev); if (sc->clk != NULL) { clk_release(sc->clk); } return (uart_bus_detach(dev)); } static device_method_t tegra_uart_bus_methods[] = { /* Device interface */ DEVMETHOD(device_probe, tegra_uart_probe), DEVMETHOD(device_attach, uart_bus_attach), DEVMETHOD(device_detach, tegra_uart_detach), { 0, 0 } }; static driver_t tegra_uart_driver = { uart_driver_name, tegra_uart_bus_methods, sizeof(struct tegra_softc), }; DRIVER_MODULE(tegra_uart, simplebus, tegra_uart_driver, 0, 0);