1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2013 Ian Lepore 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 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include "opt_platform.h" 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/bus.h> 34 #include <sys/conf.h> 35 #include <sys/kernel.h> 36 #include <sys/sysctl.h> 37 #include <machine/bus.h> 38 39 #include <dev/fdt/fdt_common.h> 40 #include <dev/ofw/ofw_bus.h> 41 #include <dev/ofw/ofw_bus_subr.h> 42 43 #include <dev/uart/uart.h> 44 #include <dev/uart/uart_cpu.h> 45 #include <dev/uart/uart_cpu_fdt.h> 46 #include <dev/uart/uart_bus.h> 47 #include <dev/uart/uart_dev_ns8250.h> 48 49 #include <arm/ti/ti_sysc.h> 50 51 #include "uart_if.h" 52 53 /* 54 * High-level UART interface. 55 */ 56 struct ti8250_softc { 57 struct ns8250_softc ns8250_base; 58 /*uint32_t mystuff;*/ 59 }; 60 61 #define MDR1_REG 8 62 #define MDR1_MODE_UART 0 63 #define MDR1_MODE_DISABLE 7 64 #define SYSCC_REG 15 65 #define SYSCC_SOFTRESET (1 << 1) 66 #define SYSS_REG 16 67 #define SYSS_STATUS_RESETDONE (1 << 0) 68 69 static int 70 ti8250_bus_probe(struct uart_softc *sc) 71 { 72 int status; 73 74 if ((status = ti_sysc_clock_enable(device_get_parent(sc->sc_dev))) != 0) 75 return (status); 76 77 /* 78 * Set the hardware to disabled mode, do a full device reset, then set 79 * it to uart mode. Most devices will be reset-and-disabled already, 80 * but you never know what a bootloader might have done. 81 */ 82 uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_DISABLE); 83 uart_setreg(&sc->sc_bas, SYSCC_REG, SYSCC_SOFTRESET); 84 while (uart_getreg(&sc->sc_bas, SYSS_REG) & SYSS_STATUS_RESETDONE) 85 continue; 86 uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_UART); 87 88 status = ns8250_bus_probe(sc); 89 if (status == 0) 90 device_set_desc(sc->sc_dev, "TI UART (16550 compatible)"); 91 92 return (status); 93 } 94 95 static kobj_method_t ti8250_methods[] = { 96 KOBJMETHOD(uart_probe, ti8250_bus_probe), 97 98 KOBJMETHOD(uart_attach, ns8250_bus_attach), 99 KOBJMETHOD(uart_detach, ns8250_bus_detach), 100 KOBJMETHOD(uart_flush, ns8250_bus_flush), 101 KOBJMETHOD(uart_getsig, ns8250_bus_getsig), 102 KOBJMETHOD(uart_ioctl, ns8250_bus_ioctl), 103 KOBJMETHOD(uart_ipend, ns8250_bus_ipend), 104 KOBJMETHOD(uart_param, ns8250_bus_param), 105 KOBJMETHOD(uart_receive, ns8250_bus_receive), 106 KOBJMETHOD(uart_setsig, ns8250_bus_setsig), 107 KOBJMETHOD(uart_transmit, ns8250_bus_transmit), 108 KOBJMETHOD(uart_txbusy, ns8250_bus_txbusy), 109 KOBJMETHOD_END 110 }; 111 112 static struct uart_class uart_ti8250_class = { 113 "ti8250", 114 ti8250_methods, 115 sizeof(struct ti8250_softc), 116 .uc_ops = &uart_ns8250_ops, 117 .uc_range = 0x88, 118 .uc_rclk = 48000000, 119 .uc_rshift = 2 120 }; 121 static struct ofw_compat_data compat_data[] = { 122 {"ti,ns16550", (uintptr_t)&uart_ti8250_class}, 123 {"ti,omap3-uart", (uintptr_t)&uart_ti8250_class}, 124 {"ti,omap4-uart", (uintptr_t)&uart_ti8250_class}, 125 {NULL, (uintptr_t)NULL}, 126 }; 127 UART_FDT_CLASS_AND_DEVICE(compat_data); 128