1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2011 5 * Ben Gray <ben.r.gray@gmail.com>. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/module.h> 34 #include <sys/bus.h> 35 #include <sys/resource.h> 36 #include <sys/rman.h> 37 #include <sys/lock.h> 38 #include <sys/mutex.h> 39 40 #include <machine/bus.h> 41 #include <machine/cpu.h> 42 #include <machine/fdt.h> 43 #include <machine/resource.h> 44 #include <machine/intr.h> 45 46 #include <dev/fdt/simplebus.h> 47 #include <dev/fdt/fdt_common.h> 48 #include <dev/ofw/ofw_bus_subr.h> 49 50 #include <arm/ti/tivar.h> 51 #include <arm/ti/ti_cpuid.h> 52 53 #include <arm/ti/am335x/am335x_reg.h> 54 55 static uint32_t chip_revision = 0xffffffff; 56 57 /** 58 * ti_revision - Returns the revision number of the device 59 * 60 * Simply returns an identifier for the revision of the chip we are running 61 * on. 62 * 63 * RETURNS 64 * A 32-bit identifier for the current chip 65 */ 66 uint32_t 67 ti_revision(void) 68 { 69 return chip_revision; 70 } 71 72 static void 73 am335x_get_revision(void) 74 { 75 uint32_t dev_feature; 76 char cpu_last_char; 77 bus_space_handle_t bsh; 78 int major; 79 int minor; 80 81 bus_space_map(fdtbus_bs_tag, AM335X_CONTROL_BASE, AM335X_CONTROL_SIZE, 0, &bsh); 82 chip_revision = bus_space_read_4(fdtbus_bs_tag, bsh, AM335X_CONTROL_DEVICE_ID); 83 dev_feature = bus_space_read_4(fdtbus_bs_tag, bsh, AM335X_CONTROL_DEV_FEATURE); 84 bus_space_unmap(fdtbus_bs_tag, bsh, AM335X_CONTROL_SIZE); 85 86 switch (dev_feature) { 87 case 0x00FF0382: 88 cpu_last_char='2'; 89 break; 90 case 0x20FF0382: 91 cpu_last_char='4'; 92 break; 93 case 0x00FF0383: 94 cpu_last_char='6'; 95 break; 96 case 0x00FE0383: 97 cpu_last_char='7'; 98 break; 99 case 0x20FF0383: 100 cpu_last_char='8'; 101 break; 102 case 0x20FE0383: 103 cpu_last_char='9'; 104 break; 105 default: 106 cpu_last_char='x'; 107 } 108 109 switch(AM335X_DEVREV(chip_revision)) { 110 case 0: 111 major = 1; 112 minor = 0; 113 break; 114 case 1: 115 major = 2; 116 minor = 0; 117 break; 118 case 2: 119 major = 2; 120 minor = 1; 121 break; 122 default: 123 major = 0; 124 minor = AM335X_DEVREV(chip_revision); 125 break; 126 } 127 printf("Texas Instruments AM335%c Processor, Revision ES%u.%u\n", 128 cpu_last_char, major, minor); 129 } 130 131 /** 132 * ti_cpu_ident - attempts to identify the chip we are running on 133 * @dummy: ignored 134 * 135 * This function is called before any of the driver are initialised, however 136 * the basic virt to phys maps have been setup in machdep.c so we can still 137 * access the required registers, we just have to use direct register reads 138 * and writes rather than going through the bus stuff. 139 * 140 * 141 */ 142 static void 143 ti_cpu_ident(void *dummy) 144 { 145 if (!ti_soc_is_supported()) 146 return; 147 switch(ti_chip()) { 148 case CHIP_AM335X: 149 am335x_get_revision(); 150 break; 151 default: 152 panic("Unknown chip type, fixme!\n"); 153 } 154 } 155 156 SYSINIT(ti_cpu_ident, SI_SUB_CPU, SI_ORDER_SECOND, ti_cpu_ident, NULL); 157