1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com> 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 * SUCH DAMAGE. 27 */ 28 29 /* 30 * Vybrid Family Timing Controller (TCON) 31 * Chapter 58, Vybrid Reference Manual, Rev. 5, 07/2013 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/bus.h> 37 #include <sys/kernel.h> 38 #include <sys/module.h> 39 #include <sys/malloc.h> 40 #include <sys/rman.h> 41 #include <sys/timeet.h> 42 #include <sys/timetc.h> 43 #include <sys/watchdog.h> 44 45 #include <dev/ofw/openfirm.h> 46 #include <dev/ofw/ofw_bus.h> 47 #include <dev/ofw/ofw_bus_subr.h> 48 49 #include <machine/bus.h> 50 #include <machine/cpu.h> 51 #include <machine/intr.h> 52 53 #include <arm/freescale/vybrid/vf_common.h> 54 55 #define TCON0_CTRL1 0x00 56 #define TCON_BYPASS (1 << 29) 57 58 struct tcon_softc { 59 struct resource *res[1]; 60 bus_space_tag_t bst; 61 bus_space_handle_t bsh; 62 }; 63 64 struct tcon_softc *tcon_sc; 65 66 static struct resource_spec tcon_spec[] = { 67 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 68 { -1, 0 } 69 }; 70 71 uint32_t 72 tcon_bypass(void) 73 { 74 75 if (tcon_sc == NULL) 76 return (1); 77 78 WRITE4(tcon_sc, TCON0_CTRL1, TCON_BYPASS); 79 80 return (0); 81 } 82 83 static int 84 tcon_probe(device_t dev) 85 { 86 87 if (!ofw_bus_status_okay(dev)) 88 return (ENXIO); 89 90 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-tcon")) 91 return (ENXIO); 92 93 device_set_desc(dev, "Vybrid Family Timing Controller (TCON)"); 94 return (BUS_PROBE_DEFAULT); 95 } 96 97 static int 98 tcon_attach(device_t dev) 99 { 100 struct tcon_softc *sc; 101 102 sc = device_get_softc(dev); 103 104 if (bus_alloc_resources(dev, tcon_spec, sc->res)) { 105 device_printf(dev, "could not allocate resources\n"); 106 return (ENXIO); 107 } 108 109 /* Memory interface */ 110 sc->bst = rman_get_bustag(sc->res[0]); 111 sc->bsh = rman_get_bushandle(sc->res[0]); 112 113 tcon_sc = sc; 114 115 return (0); 116 } 117 118 static device_method_t tcon_methods[] = { 119 DEVMETHOD(device_probe, tcon_probe), 120 DEVMETHOD(device_attach, tcon_attach), 121 { 0, 0 } 122 }; 123 124 static driver_t tcon_driver = { 125 "tcon", 126 tcon_methods, 127 sizeof(struct tcon_softc), 128 }; 129 130 DRIVER_MODULE(tcon, simplebus, tcon_driver, 0, 0); 131