[f0dd0c5] | 1 | #include <machine/rtems-bsd-kernel-space.h> |
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| 2 | |
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| 3 | /*- |
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| 4 | * Copyright (c) 2009-2010 The FreeBSD Foundation |
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| 5 | * All rights reserved. |
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| 6 | * |
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| 7 | * This software was developed by Semihalf under sponsorship from |
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| 8 | * the FreeBSD Foundation. |
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| 9 | * |
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| 10 | * Redistribution and use in source and binary forms, with or without |
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| 11 | * modification, are permitted provided that the following conditions |
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| 12 | * are met: |
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| 13 | * 1. Redistributions of source code must retain the above copyright |
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| 14 | * notice, this list of conditions and the following disclaimer. |
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 16 | * notice, this list of conditions and the following disclaimer in the |
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| 17 | * documentation and/or other materials provided with the distribution. |
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| 18 | * |
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 29 | * SUCH DAMAGE. |
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| 30 | */ |
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| 31 | |
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| 32 | #include <sys/cdefs.h> |
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| 33 | __FBSDID("$FreeBSD$"); |
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| 34 | |
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| 35 | #include <rtems/bsd/sys/param.h> |
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| 36 | #include <sys/kernel.h> |
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| 37 | #include <sys/malloc.h> |
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| 38 | #include <sys/systm.h> |
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| 39 | |
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| 40 | #include <contrib/libfdt/libfdt.h> |
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| 41 | |
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| 42 | #include <machine/stdarg.h> |
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| 43 | |
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| 44 | #include <dev/fdt/fdt_common.h> |
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| 45 | #include <dev/ofw/ofwvar.h> |
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| 46 | #include <dev/ofw/openfirm.h> |
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| 47 | |
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| 48 | #include <rtems/bsd/local/ofw_if.h> |
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| 49 | |
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| 50 | #ifdef DEBUG |
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| 51 | #define debugf(fmt, args...) do { printf("%s(): ", __func__); \ |
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| 52 | printf(fmt,##args); } while (0) |
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| 53 | #else |
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| 54 | #define debugf(fmt, args...) |
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| 55 | #endif |
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| 56 | |
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| 57 | #if defined(__arm__) |
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| 58 | #if defined(SOC_MV_ARMADAXP) || defined(SOC_MV_ARMADA38X) || \ |
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| 59 | defined(SOC_MV_DISCOVERY) || defined(SOC_MV_DOVE) || \ |
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| 60 | defined(SOC_MV_FREY) || defined(SOC_MV_KIRKWOOD) || \ |
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| 61 | defined(SOC_MV_LOKIPLUS) || defined(SOC_MV_ORION) |
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| 62 | #define FDT_MARVELL |
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| 63 | #endif |
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| 64 | #endif |
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| 65 | |
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| 66 | static int ofw_fdt_init(ofw_t, void *); |
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| 67 | static phandle_t ofw_fdt_peer(ofw_t, phandle_t); |
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| 68 | static phandle_t ofw_fdt_child(ofw_t, phandle_t); |
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| 69 | static phandle_t ofw_fdt_parent(ofw_t, phandle_t); |
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| 70 | static phandle_t ofw_fdt_instance_to_package(ofw_t, ihandle_t); |
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| 71 | static ssize_t ofw_fdt_getproplen(ofw_t, phandle_t, const char *); |
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| 72 | static ssize_t ofw_fdt_getprop(ofw_t, phandle_t, const char *, void *, size_t); |
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| 73 | static int ofw_fdt_nextprop(ofw_t, phandle_t, const char *, char *, size_t); |
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| 74 | static int ofw_fdt_setprop(ofw_t, phandle_t, const char *, const void *, |
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| 75 | size_t); |
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| 76 | static ssize_t ofw_fdt_canon(ofw_t, const char *, char *, size_t); |
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| 77 | static phandle_t ofw_fdt_finddevice(ofw_t, const char *); |
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| 78 | static ssize_t ofw_fdt_instance_to_path(ofw_t, ihandle_t, char *, size_t); |
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| 79 | static ssize_t ofw_fdt_package_to_path(ofw_t, phandle_t, char *, size_t); |
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| 80 | static int ofw_fdt_interpret(ofw_t, const char *, int, cell_t *); |
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| 81 | |
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| 82 | static ofw_method_t ofw_fdt_methods[] = { |
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| 83 | OFWMETHOD(ofw_init, ofw_fdt_init), |
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| 84 | OFWMETHOD(ofw_peer, ofw_fdt_peer), |
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| 85 | OFWMETHOD(ofw_child, ofw_fdt_child), |
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| 86 | OFWMETHOD(ofw_parent, ofw_fdt_parent), |
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| 87 | OFWMETHOD(ofw_instance_to_package, ofw_fdt_instance_to_package), |
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| 88 | OFWMETHOD(ofw_getproplen, ofw_fdt_getproplen), |
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| 89 | OFWMETHOD(ofw_getprop, ofw_fdt_getprop), |
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| 90 | OFWMETHOD(ofw_nextprop, ofw_fdt_nextprop), |
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| 91 | OFWMETHOD(ofw_setprop, ofw_fdt_setprop), |
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| 92 | OFWMETHOD(ofw_canon, ofw_fdt_canon), |
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| 93 | OFWMETHOD(ofw_finddevice, ofw_fdt_finddevice), |
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| 94 | OFWMETHOD(ofw_instance_to_path, ofw_fdt_instance_to_path), |
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| 95 | OFWMETHOD(ofw_package_to_path, ofw_fdt_package_to_path), |
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| 96 | OFWMETHOD(ofw_interpret, ofw_fdt_interpret), |
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| 97 | { 0, 0 } |
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| 98 | }; |
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| 99 | |
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| 100 | static ofw_def_t ofw_fdt = { |
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| 101 | OFW_FDT, |
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| 102 | ofw_fdt_methods, |
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| 103 | 0 |
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| 104 | }; |
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| 105 | OFW_DEF(ofw_fdt); |
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| 106 | |
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| 107 | static void *fdtp = NULL; |
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| 108 | |
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| 109 | static int |
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| 110 | sysctl_handle_dtb(SYSCTL_HANDLER_ARGS) |
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| 111 | { |
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| 112 | |
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| 113 | return (sysctl_handle_opaque(oidp, fdtp, fdt_totalsize(fdtp), req)); |
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| 114 | } |
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| 115 | |
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| 116 | static void |
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| 117 | sysctl_register_fdt_oid(void *arg) |
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| 118 | { |
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| 119 | |
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| 120 | /* If there is no FDT registered, skip adding the sysctl */ |
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| 121 | if (fdtp == NULL) |
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| 122 | return; |
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| 123 | |
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| 124 | SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_fdt), OID_AUTO, "dtb", |
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| 125 | CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0, sysctl_handle_dtb, "", |
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| 126 | "Device Tree Blob"); |
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| 127 | } |
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| 128 | SYSINIT(dtb_oid, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_fdt_oid, 0); |
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| 129 | |
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| 130 | static int |
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| 131 | ofw_fdt_init(ofw_t ofw, void *data) |
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| 132 | { |
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| 133 | int err; |
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| 134 | |
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| 135 | /* Check FDT blob integrity */ |
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| 136 | if ((err = fdt_check_header(data)) != 0) |
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| 137 | return (err); |
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| 138 | |
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| 139 | fdtp = data; |
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| 140 | return (0); |
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| 141 | } |
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| 142 | |
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| 143 | /* |
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| 144 | * Device tree functions. |
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| 145 | * |
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| 146 | * We use the offset from fdtp to the node as the 'phandle' in OF interface. |
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| 147 | * |
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| 148 | * phandle is a u32 value, therefore we cannot use the pointer to node as |
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| 149 | * phandle in 64 bit. We also do not use the usual fdt offset as phandle, |
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| 150 | * as it can be 0, and the OF interface has special meaning for phandle 0. |
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| 151 | */ |
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| 152 | |
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| 153 | static phandle_t |
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| 154 | fdt_offset_phandle(int offset) |
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| 155 | { |
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| 156 | if (offset < 0) |
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| 157 | return (0); |
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| 158 | return ((phandle_t)offset + fdt_off_dt_struct(fdtp)); |
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| 159 | } |
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| 160 | |
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| 161 | static int |
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| 162 | fdt_phandle_offset(phandle_t p) |
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| 163 | { |
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| 164 | int pint = (int)p; |
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| 165 | int dtoff = fdt_off_dt_struct(fdtp); |
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| 166 | |
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| 167 | if (pint < dtoff) |
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| 168 | return (-1); |
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| 169 | return (pint - dtoff); |
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| 170 | } |
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| 171 | |
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| 172 | /* Return the next sibling of this node or 0. */ |
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| 173 | static phandle_t |
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| 174 | ofw_fdt_peer(ofw_t ofw, phandle_t node) |
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| 175 | { |
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| 176 | int depth, offset; |
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| 177 | |
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| 178 | if (node == 0) { |
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| 179 | /* Find root node */ |
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| 180 | offset = fdt_path_offset(fdtp, "/"); |
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| 181 | |
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| 182 | return (fdt_offset_phandle(offset)); |
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| 183 | } |
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| 184 | |
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| 185 | offset = fdt_phandle_offset(node); |
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| 186 | if (offset < 0) |
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| 187 | return (0); |
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| 188 | |
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| 189 | for (depth = 1, offset = fdt_next_node(fdtp, offset, &depth); |
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| 190 | offset >= 0; |
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| 191 | offset = fdt_next_node(fdtp, offset, &depth)) { |
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| 192 | if (depth < 0) |
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| 193 | return (0); |
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| 194 | if (depth == 1) |
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| 195 | return (fdt_offset_phandle(offset)); |
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| 196 | } |
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| 197 | |
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| 198 | return (0); |
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| 199 | } |
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| 200 | |
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| 201 | /* Return the first child of this node or 0. */ |
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| 202 | static phandle_t |
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| 203 | ofw_fdt_child(ofw_t ofw, phandle_t node) |
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| 204 | { |
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| 205 | int depth, offset; |
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| 206 | |
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| 207 | offset = fdt_phandle_offset(node); |
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| 208 | if (offset < 0) |
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| 209 | return (0); |
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| 210 | |
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| 211 | for (depth = 0, offset = fdt_next_node(fdtp, offset, &depth); |
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| 212 | (offset >= 0) && (depth > 0); |
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| 213 | offset = fdt_next_node(fdtp, offset, &depth)) { |
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| 214 | if (depth < 0) |
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| 215 | return (0); |
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| 216 | if (depth == 1) |
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| 217 | return (fdt_offset_phandle(offset)); |
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| 218 | } |
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| 219 | |
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| 220 | return (0); |
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| 221 | } |
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| 222 | |
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| 223 | /* Return the parent of this node or 0. */ |
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| 224 | static phandle_t |
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| 225 | ofw_fdt_parent(ofw_t ofw, phandle_t node) |
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| 226 | { |
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| 227 | int offset, paroffset; |
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| 228 | |
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| 229 | offset = fdt_phandle_offset(node); |
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| 230 | if (offset < 0) |
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| 231 | return (0); |
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| 232 | |
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| 233 | paroffset = fdt_parent_offset(fdtp, offset); |
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| 234 | return (fdt_offset_phandle(paroffset)); |
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| 235 | } |
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| 236 | |
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| 237 | /* Return the package handle that corresponds to an instance handle. */ |
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| 238 | static phandle_t |
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| 239 | ofw_fdt_instance_to_package(ofw_t ofw, ihandle_t instance) |
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| 240 | { |
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| 241 | |
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| 242 | /* Where real OF uses ihandles in the tree, FDT uses xref phandles */ |
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| 243 | return (OF_node_from_xref(instance)); |
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| 244 | } |
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| 245 | |
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| 246 | /* Get the length of a property of a package. */ |
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| 247 | static ssize_t |
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| 248 | ofw_fdt_getproplen(ofw_t ofw, phandle_t package, const char *propname) |
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| 249 | { |
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| 250 | const struct fdt_property *prop; |
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| 251 | int offset, len; |
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| 252 | |
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| 253 | offset = fdt_phandle_offset(package); |
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| 254 | if (offset < 0) |
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| 255 | return (-1); |
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| 256 | |
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| 257 | len = -1; |
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| 258 | prop = fdt_get_property(fdtp, offset, propname, &len); |
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| 259 | |
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| 260 | if (prop == NULL && strcmp(propname, "name") == 0) { |
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| 261 | /* Emulate the 'name' property */ |
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| 262 | fdt_get_name(fdtp, offset, &len); |
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| 263 | return (len + 1); |
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| 264 | } |
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| 265 | |
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| 266 | if (prop == NULL && offset == fdt_path_offset(fdtp, "/chosen")) { |
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| 267 | if (strcmp(propname, "fdtbootcpu") == 0) |
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| 268 | return (sizeof(cell_t)); |
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| 269 | if (strcmp(propname, "fdtmemreserv") == 0) |
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| 270 | return (sizeof(uint64_t)*2*fdt_num_mem_rsv(fdtp)); |
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| 271 | } |
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| 272 | |
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| 273 | if (prop == NULL) |
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| 274 | return (-1); |
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| 275 | |
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| 276 | return (len); |
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| 277 | } |
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| 278 | |
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| 279 | /* Get the value of a property of a package. */ |
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| 280 | static ssize_t |
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| 281 | ofw_fdt_getprop(ofw_t ofw, phandle_t package, const char *propname, void *buf, |
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| 282 | size_t buflen) |
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| 283 | { |
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| 284 | const void *prop; |
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| 285 | const char *name; |
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| 286 | int len, offset; |
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| 287 | uint32_t cpuid; |
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| 288 | |
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| 289 | offset = fdt_phandle_offset(package); |
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| 290 | if (offset < 0) |
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| 291 | return (-1); |
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| 292 | |
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| 293 | prop = fdt_getprop(fdtp, offset, propname, &len); |
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| 294 | |
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| 295 | if (prop == NULL && strcmp(propname, "name") == 0) { |
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| 296 | /* Emulate the 'name' property */ |
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| 297 | name = fdt_get_name(fdtp, offset, &len); |
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| 298 | strncpy(buf, name, buflen); |
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| 299 | if (len + 1 > buflen) |
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| 300 | len = buflen; |
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| 301 | return (len + 1); |
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| 302 | } |
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| 303 | |
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| 304 | if (prop == NULL && offset == fdt_path_offset(fdtp, "/chosen")) { |
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| 305 | if (strcmp(propname, "fdtbootcpu") == 0) { |
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| 306 | cpuid = cpu_to_fdt32(fdt_boot_cpuid_phys(fdtp)); |
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| 307 | len = sizeof(cpuid); |
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| 308 | prop = &cpuid; |
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| 309 | } |
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| 310 | if (strcmp(propname, "fdtmemreserv") == 0) { |
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| 311 | prop = (char *)fdtp + fdt_off_mem_rsvmap(fdtp); |
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| 312 | len = sizeof(uint64_t)*2*fdt_num_mem_rsv(fdtp); |
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| 313 | } |
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| 314 | } |
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| 315 | |
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| 316 | if (prop == NULL) |
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| 317 | return (-1); |
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| 318 | |
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| 319 | if (len > buflen) |
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| 320 | len = buflen; |
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| 321 | bcopy(prop, buf, len); |
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| 322 | return (len); |
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| 323 | } |
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| 324 | |
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| 325 | /* |
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| 326 | * Get the next property of a package. Return values: |
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| 327 | * -1: package or previous property does not exist |
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| 328 | * 0: no more properties |
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| 329 | * 1: success |
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| 330 | */ |
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| 331 | static int |
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| 332 | ofw_fdt_nextprop(ofw_t ofw, phandle_t package, const char *previous, char *buf, |
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| 333 | size_t size) |
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| 334 | { |
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| 335 | const struct fdt_property *prop; |
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| 336 | const char *name; |
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| 337 | int offset; |
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| 338 | |
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| 339 | offset = fdt_phandle_offset(package); |
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| 340 | if (offset < 0) |
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| 341 | return (-1); |
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| 342 | |
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| 343 | /* Find the first prop in the node */ |
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| 344 | offset = fdt_first_property_offset(fdtp, offset); |
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| 345 | if (offset < 0) |
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| 346 | return (0); /* No properties */ |
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| 347 | |
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| 348 | if (previous != NULL) { |
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| 349 | while (offset >= 0) { |
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| 350 | prop = fdt_get_property_by_offset(fdtp, offset, NULL); |
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| 351 | if (prop == NULL) |
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| 352 | return (-1); /* Internal error */ |
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| 353 | |
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| 354 | offset = fdt_next_property_offset(fdtp, offset); |
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| 355 | if (offset < 0) |
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| 356 | return (0); /* No more properties */ |
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| 357 | |
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| 358 | /* Check if the last one was the one we wanted */ |
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| 359 | name = fdt_string(fdtp, fdt32_to_cpu(prop->nameoff)); |
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| 360 | if (strcmp(name, previous) == 0) |
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| 361 | break; |
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| 362 | } |
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| 363 | } |
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| 364 | |
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| 365 | prop = fdt_get_property_by_offset(fdtp, offset, &offset); |
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| 366 | if (prop == NULL) |
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| 367 | return (-1); /* Internal error */ |
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| 368 | |
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| 369 | strncpy(buf, fdt_string(fdtp, fdt32_to_cpu(prop->nameoff)), size); |
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| 370 | |
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| 371 | return (1); |
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| 372 | } |
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| 373 | |
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| 374 | /* Set the value of a property of a package. */ |
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| 375 | static int |
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| 376 | ofw_fdt_setprop(ofw_t ofw, phandle_t package, const char *propname, |
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| 377 | const void *buf, size_t len) |
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| 378 | { |
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| 379 | int offset; |
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| 380 | |
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| 381 | offset = fdt_phandle_offset(package); |
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| 382 | if (offset < 0) |
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| 383 | return (-1); |
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| 384 | |
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| 385 | return (fdt_setprop_inplace(fdtp, offset, propname, buf, len)); |
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| 386 | } |
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| 387 | |
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| 388 | /* Convert a device specifier to a fully qualified pathname. */ |
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| 389 | static ssize_t |
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| 390 | ofw_fdt_canon(ofw_t ofw, const char *device, char *buf, size_t len) |
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| 391 | { |
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| 392 | |
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| 393 | return (-1); |
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| 394 | } |
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| 395 | |
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| 396 | /* Return a package handle for the specified device. */ |
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| 397 | static phandle_t |
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| 398 | ofw_fdt_finddevice(ofw_t ofw, const char *device) |
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| 399 | { |
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| 400 | int offset; |
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| 401 | |
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| 402 | offset = fdt_path_offset(fdtp, device); |
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| 403 | if (offset < 0) |
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| 404 | return (-1); |
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| 405 | return (fdt_offset_phandle(offset)); |
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| 406 | } |
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| 407 | |
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| 408 | /* Return the fully qualified pathname corresponding to an instance. */ |
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| 409 | static ssize_t |
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| 410 | ofw_fdt_instance_to_path(ofw_t ofw, ihandle_t instance, char *buf, size_t len) |
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| 411 | { |
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| 412 | phandle_t phandle; |
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| 413 | |
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| 414 | phandle = OF_instance_to_package(instance); |
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| 415 | if (phandle == -1) |
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| 416 | return (-1); |
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| 417 | |
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| 418 | return (OF_package_to_path(phandle, buf, len)); |
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| 419 | } |
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| 420 | |
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| 421 | /* Return the fully qualified pathname corresponding to a package. */ |
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| 422 | static ssize_t |
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| 423 | ofw_fdt_package_to_path(ofw_t ofw, phandle_t package, char *buf, size_t len) |
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| 424 | { |
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| 425 | |
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| 426 | return (-1); |
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| 427 | } |
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| 428 | |
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| 429 | #if defined(FDT_MARVELL) || defined(__powerpc__) |
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| 430 | static int |
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| 431 | ofw_fdt_fixup(ofw_t ofw) |
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| 432 | { |
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| 433 | #define FDT_MODEL_LEN 80 |
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| 434 | char model[FDT_MODEL_LEN]; |
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| 435 | phandle_t root; |
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| 436 | ssize_t len; |
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| 437 | int i; |
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| 438 | |
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| 439 | if ((root = ofw_fdt_finddevice(ofw, "/")) == -1) |
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| 440 | return (ENODEV); |
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| 441 | |
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| 442 | if ((len = ofw_fdt_getproplen(ofw, root, "model")) <= 0) |
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| 443 | return (0); |
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| 444 | |
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| 445 | bzero(model, FDT_MODEL_LEN); |
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| 446 | if (ofw_fdt_getprop(ofw, root, "model", model, FDT_MODEL_LEN) <= 0) |
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| 447 | return (0); |
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| 448 | |
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| 449 | /* |
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| 450 | * Search fixup table and call handler if appropriate. |
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| 451 | */ |
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| 452 | for (i = 0; fdt_fixup_table[i].model != NULL; i++) { |
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| 453 | if (strncmp(model, fdt_fixup_table[i].model, |
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| 454 | FDT_MODEL_LEN) != 0) |
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| 455 | continue; |
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| 456 | |
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| 457 | if (fdt_fixup_table[i].handler != NULL) |
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| 458 | (*fdt_fixup_table[i].handler)(root); |
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| 459 | } |
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| 460 | |
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| 461 | return (0); |
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| 462 | } |
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| 463 | #endif |
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| 464 | |
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| 465 | static int |
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| 466 | ofw_fdt_interpret(ofw_t ofw, const char *cmd, int nret, cell_t *retvals) |
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| 467 | { |
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| 468 | #if defined(FDT_MARVELL) || defined(__powerpc__) |
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| 469 | int rv; |
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| 470 | |
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| 471 | /* |
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| 472 | * Note: FDT does not have the possibility to 'interpret' commands, |
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| 473 | * but we abuse the interface a bit to use it for doing non-standard |
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| 474 | * operations on the device tree blob. |
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| 475 | * |
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| 476 | * Currently the only supported 'command' is to trigger performing |
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| 477 | * fixups. |
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| 478 | */ |
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| 479 | if (strncmp("perform-fixup", cmd, 13) != 0) |
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| 480 | return (0); |
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| 481 | |
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| 482 | rv = ofw_fdt_fixup(ofw); |
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| 483 | if (nret > 0) |
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| 484 | retvals[0] = rv; |
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| 485 | |
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| 486 | return (rv); |
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| 487 | #else |
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| 488 | return (0); |
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| 489 | #endif |
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| 490 | } |
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