1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2018 Justin Hibbits 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 #include <sys/param.h> 30 #include <sys/bus.h> 31 #include <sys/kernel.h> 32 #include <sys/module.h> 33 34 #include <machine/bus.h> 35 36 #include <dev/ofw/ofw_bus.h> 37 #include <dev/ofw/ofw_bus_subr.h> 38 39 /* 40 * From the P1022 manual, sequence for writing to L2CTL is: 41 * - mbar 42 * - isync 43 * - write 44 * - read 45 * - mbar 46 */ 47 #define L2_CTL 0x0 48 #define L2CTL_L2E 0x80000000 49 #define L2CTL_L2I 0x40000000 50 struct mpc85xx_cache_softc { 51 struct resource *sc_mem; 52 }; 53 54 static struct ofw_compat_data compats[] = { 55 {"fsl,8540-l2-cache-controller", 1}, 56 {"fsl,8541-l2-cache-controller", 1}, 57 {"fsl,8544-l2-cache-controller", 1}, 58 {"fsl,8548-l2-cache-controller", 1}, 59 {"fsl,8555-l2-cache-controller", 1}, 60 {"fsl,8568-l2-cache-controller", 1}, 61 {"fsl,b4420-l2-cache-controller", 1}, 62 {"fsl,b4860-l2-cache-controller", 1}, 63 {"fsl,bsc9131-l2-cache-controller", 1}, 64 {"fsl,bsc9132-l2-cache-controller", 1}, 65 {"fsl,c293-l2-cache-controller", 1}, 66 {"fsl,mpc8536-l2-cache-controller", 1}, 67 {"fsl,mpc8540-l2-cache-controller", 1}, 68 {"fsl,mpc8541-l2-cache-controller", 1}, 69 {"fsl,mpc8544-l2-cache-controller", 1}, 70 {"fsl,mpc8548-l2-cache-controller", 1}, 71 {"fsl,mpc8555-l2-cache-controller", 1}, 72 {"fsl,mpc8560-l2-cache-controller", 1}, 73 {"fsl,mpc8568-l2-cache-controller", 1}, 74 {"fsl,mpc8569-l2-cache-controller", 1}, 75 {"fsl,mpc8572-l2-cache-controller", 1}, 76 {"fsl,p1010-l2-cache-controller", 1}, 77 {"fsl,p1011-l2-cache-controller", 1}, 78 {"fsl,p1012-l2-cache-controller", 1}, 79 {"fsl,p1013-l2-cache-controller", 1}, 80 {"fsl,p1014-l2-cache-controller", 1}, 81 {"fsl,p1015-l2-cache-controller", 1}, 82 {"fsl,p1016-l2-cache-controller", 1}, 83 {"fsl,p1020-l2-cache-controller", 1}, 84 {"fsl,p1021-l2-cache-controller", 1}, 85 {"fsl,p1022-l2-cache-controller", 1}, 86 {"fsl,p1023-l2-cache-controller", 1}, 87 {"fsl,p1024-l2-cache-controller", 1}, 88 {"fsl,p1025-l2-cache-controller", 1}, 89 {"fsl,p2010-l2-cache-controller", 1}, 90 {"fsl,p2020-l2-cache-controller", 1}, 91 {"fsl,t2080-l2-cache-controller", 1}, 92 {"fsl,t4240-l2-cache-controller", 1}, 93 {0, 0} 94 }; 95 96 static int 97 mpc85xx_cache_probe(device_t dev) 98 { 99 100 if (ofw_bus_search_compatible(dev, compats)->ocd_str == NULL) 101 return (ENXIO); 102 103 device_set_desc(dev, "MPC85xx L2 cache"); 104 return (0); 105 } 106 107 static int 108 mpc85xx_cache_attach(device_t dev) 109 { 110 struct mpc85xx_cache_softc *sc = device_get_softc(dev); 111 int rid; 112 int cache_line_size, cache_size; 113 114 /* Map registers. */ 115 rid = 0; 116 sc->sc_mem = bus_alloc_resource_any(dev, 117 SYS_RES_MEMORY, &rid, RF_ACTIVE); 118 if (sc->sc_mem == NULL) 119 return (ENOMEM); 120 121 /* Enable cache and flash invalidate. */ 122 __asm __volatile ("mbar; isync" ::: "memory"); 123 bus_write_4(sc->sc_mem, L2_CTL, L2CTL_L2E | L2CTL_L2I); 124 bus_read_4(sc->sc_mem, L2_CTL); 125 __asm __volatile ("mbar" ::: "memory"); 126 127 cache_line_size = 0; 128 cache_size = 0; 129 OF_getencprop(ofw_bus_get_node(dev), "cache-size", &cache_size, 130 sizeof(cache_size)); 131 OF_getencprop(ofw_bus_get_node(dev), "cache-line-size", 132 &cache_line_size, sizeof(cache_line_size)); 133 134 if (cache_line_size != 0 && cache_size != 0) 135 device_printf(dev, 136 "L2 cache size: %dKB, cache line size: %d bytes\n", 137 cache_size / 1024, cache_line_size); 138 139 return (0); 140 } 141 142 static device_method_t mpc85xx_cache_methods[] = { 143 /* device methods */ 144 DEVMETHOD(device_probe, mpc85xx_cache_probe), 145 DEVMETHOD(device_attach, mpc85xx_cache_attach), 146 147 DEVMETHOD_END 148 }; 149 150 static driver_t mpc85xx_cache_driver = { 151 "cache", 152 mpc85xx_cache_methods, 153 sizeof(struct mpc85xx_cache_softc), 154 }; 155 156 EARLY_DRIVER_MODULE(mpc85xx_cache, simplebus, mpc85xx_cache_driver, NULL, NULL, 157 BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE); 158