1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2012, Adrian Chadd <adrian@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 */ 27#include "opt_uart.h" 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD$"); 31 32#include <sys/param.h> 33#include <sys/systm.h> 34#include <sys/bus.h> 35#include <sys/conf.h> 36#include <sys/kernel.h> 37#include <sys/module.h> 38 39#include <machine/bus.h> 40 41#include <dev/uart/uart.h> 42#include <dev/uart/uart_cpu.h> 43#include <dev/uart/uart_bus.h> 44 45#include <mips/atheros/ar71xxreg.h> 46#include <mips/atheros/ar71xx_cpudef.h> 47 48#include <mips/atheros/uart_dev_ar933x.h> 49#ifdef EARLY_PRINTF 50#include <mips/atheros/ar933x_uart.h> 51#endif 52 53#include "uart_if.h" 54 55static int uart_ar933x_probe(device_t dev); 56extern struct uart_class uart_ar933x_uart_class; 57 58static device_method_t uart_ar933x_methods[] = { 59 /* Device interface */ 60 DEVMETHOD(device_probe, uart_ar933x_probe), 61 DEVMETHOD(device_attach, uart_bus_attach), 62 DEVMETHOD(device_detach, uart_bus_detach), 63 { 0, 0 } 64}; 65 66static driver_t uart_ar933x_driver = { 67 uart_driver_name, 68 uart_ar933x_methods, 69 sizeof(struct uart_softc), 70}; 71 72extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs; 73 74static int 75uart_ar933x_probe(device_t dev) 76{ 77 struct uart_softc *sc; 78 uint64_t freq; 79 80 freq = ar71xx_uart_freq(); 81 82 sc = device_get_softc(dev); 83 sc->sc_sysdev = SLIST_FIRST(&uart_sysdevs); 84 sc->sc_class = &uart_ar933x_class; 85 bcopy(&sc->sc_sysdev->bas, &sc->sc_bas, sizeof(sc->sc_bas)); 86 sc->sc_sysdev->bas.regshft = 0; 87 sc->sc_sysdev->bas.bst = mips_bus_space_generic; 88 sc->sc_sysdev->bas.bsh = MIPS_PHYS_TO_KSEG1(AR71XX_UART_ADDR); 89 sc->sc_bas.regshft = 0; 90 sc->sc_bas.bst = mips_bus_space_generic; 91 sc->sc_bas.bsh = MIPS_PHYS_TO_KSEG1(AR71XX_UART_ADDR); 92 93 return (uart_bus_probe(dev, 2, 0, freq, 0, 0, 0)); 94} 95 96/* 97 * Assume the UART is setup by the bootloader and just echo that. 98 */ 99#if defined(EARLY_PRINTF) 100static void 101ar933x_early_putc(int c) 102{ 103 int i = 1000; 104 105 /* Wait until FIFO is clear */ 106 while ((i > 0) && (ATH_READ_REG(AR71XX_UART_ADDR + AR933X_UART_CS_REG) & 107 AR933X_UART_CS_TX_BUSY)) 108 i--; 109 110 /* Write it out */ 111 ATH_WRITE_REG(AR71XX_UART_ADDR + AR933X_UART_DATA_REG, 112 (c & 0xff)| AR933X_UART_DATA_TX_CSR); 113} 114early_putc_t *early_putc = ar933x_early_putc; 115#endif /* EARLY_PRINTF */ 116 117DRIVER_MODULE(uart, apb, uart_ar933x_driver, uart_devclass, 0, 0); 118