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/cdefs.h> 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/sysctl.h> 38 #include <machine/bus.h> 39 40 #include <dev/fdt/fdt_common.h> 41 #include <dev/ofw/ofw_bus.h> 42 #include <dev/ofw/ofw_bus_subr.h> 43 44 #include <dev/uart/uart.h> 45 #include <dev/uart/uart_cpu.h> 46 #include <dev/uart/uart_cpu_fdt.h> 47 #include <dev/uart/uart_bus.h> 48 #include <dev/uart/uart_dev_ns8250.h> 49 50 #include <arm/ti/ti_sysc.h> 51 52 #include "uart_if.h" 53 54 /* 55 * High-level UART interface. 56 */ 57 struct ti8250_softc { 58 struct ns8250_softc ns8250_base; 59 /*uint32_t mystuff;*/ 60 }; 61 62 #define MDR1_REG 8 63 #define MDR1_MODE_UART 0 64 #define MDR1_MODE_DISABLE 7 65 #define SYSCC_REG 15 66 #define SYSCC_SOFTRESET (1 << 1) 67 #define SYSS_REG 16 68 #define SYSS_STATUS_RESETDONE (1 << 0) 69 70 static int 71 ti8250_bus_probe(struct uart_softc *sc) 72 { 73 int status; 74 75 if ((status = ti_sysc_clock_enable(device_get_parent(sc->sc_dev))) != 0) 76 return (status); 77 78 /* 79 * Set the hardware to disabled mode, do a full device reset, then set 80 * it to uart mode. Most devices will be reset-and-disabled already, 81 * but you never know what a bootloader might have done. 82 */ 83 uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_DISABLE); 84 uart_setreg(&sc->sc_bas, SYSCC_REG, SYSCC_SOFTRESET); 85 while (uart_getreg(&sc->sc_bas, SYSS_REG) & SYSS_STATUS_RESETDONE) 86 continue; 87 uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_UART); 88 89 status = ns8250_bus_probe(sc); 90 if (status == 0) 91 device_set_desc(sc->sc_dev, "TI UART (16550 compatible)"); 92 93 return (status); 94 } 95 96 static kobj_method_t ti8250_methods[] = { 97 KOBJMETHOD(uart_probe, ti8250_bus_probe), 98 99 KOBJMETHOD(uart_attach, ns8250_bus_attach), 100 KOBJMETHOD(uart_detach, ns8250_bus_detach), 101 KOBJMETHOD(uart_flush, ns8250_bus_flush), 102 KOBJMETHOD(uart_getsig, ns8250_bus_getsig), 103 KOBJMETHOD(uart_ioctl, ns8250_bus_ioctl), 104 KOBJMETHOD(uart_ipend, ns8250_bus_ipend), 105 KOBJMETHOD(uart_param, ns8250_bus_param), 106 KOBJMETHOD(uart_receive, ns8250_bus_receive), 107 KOBJMETHOD(uart_setsig, ns8250_bus_setsig), 108 KOBJMETHOD(uart_transmit, ns8250_bus_transmit), 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