arch/powerpc/platforms/pseries/firmware.c

   1 /*
   2  *  pSeries firmware setup code.
   3  *
   4  *  Portions from arch/powerpc/platforms/pseries/setup.c:
   5  *   Copyright (C) 1995  Linus Torvalds
   6  *   Adapted from 'alpha' version by Gary Thomas
   7  *   Modified by Cort Dougan (cort@cs.nmt.edu)
   8  *   Modified by PPC64 Team, IBM Corp
   9  *
  10  *  Portions from arch/powerpc/kernel/firmware.c
  11  *   Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
  12  *   Modifications for ppc64:
  13  *    Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
  14  *    Copyright (C) 2005 Stephen Rothwell, IBM Corporation
  15  *
  16  *  Copyright 2006 IBM Corporation.
  17  *
  18  * This program is free software; you can redistribute it and/or
  19  * modify it under the terms of the GNU General Public License
  20  * as published by the Free Software Foundation; either version
  21  * 2 of the License, or (at your option) any later version.
  22  */
  23
  24
  25 #include <linux/of_fdt.h>
  26 #include <asm/firmware.h>
  27 #include <asm/prom.h>
  28 #include <asm/udbg.h>
  29
  30 #include "pseries.h"
  31
  32 struct hypertas_fw_feature {
  33     unsigned long val;
  34     char * name;
  35 };
  36
  37 /*
  38  * The names in this table match names in rtas/ibm,hypertas-functions.  If the
  39  * entry ends in a '*', only upto the '*' is matched.  Otherwise the entire
  40  * string must match.
  41  */
  42 static __initdata struct hypertas_fw_feature
  43 hypertas_fw_features_table[] = {
  44         {FW_FEATURE_PFT,                "hcall-pft"},
  45         {FW_FEATURE_TCE,                "hcall-tce"},
  46         {FW_FEATURE_SPRG0,              "hcall-sprg0"},
  47         {FW_FEATURE_DABR,               "hcall-dabr"},
  48         {FW_FEATURE_COPY,               "hcall-copy"},
  49         {FW_FEATURE_ASR,                "hcall-asr"},
  50         {FW_FEATURE_DEBUG,              "hcall-debug"},
  51         {FW_FEATURE_PERF,               "hcall-perf"},
  52         {FW_FEATURE_DUMP,               "hcall-dump"},
  53         {FW_FEATURE_INTERRUPT,          "hcall-interrupt"},
  54         {FW_FEATURE_MIGRATE,            "hcall-migrate"},
  55         {FW_FEATURE_PERFMON,            "hcall-perfmon"},
  56         {FW_FEATURE_CRQ,                "hcall-crq"},
  57         {FW_FEATURE_VIO,                "hcall-vio"},
  58         {FW_FEATURE_RDMA,               "hcall-rdma"},
  59         {FW_FEATURE_LLAN,               "hcall-lLAN"},
  60         {FW_FEATURE_BULK_REMOVE,        "hcall-bulk"},
  61         {FW_FEATURE_XDABR,              "hcall-xdabr"},
  62         {FW_FEATURE_MULTITCE,           "hcall-multi-tce"},
  63         {FW_FEATURE_SPLPAR,             "hcall-splpar"},
  64         {FW_FEATURE_VPHN,               "hcall-vphn"},
  65         {FW_FEATURE_SET_MODE,           "hcall-set-mode"},
  66         {FW_FEATURE_BEST_ENERGY,        "hcall-best-energy-1*"},
  67 };
  68
  69 /* Build up the firmware features bitmask using the contents of
  70  * device-tree/ibm,hypertas-functions.  Ultimately this functionality may
  71  * be moved into prom.c prom_init().
  72  */
  73 static void __init fw_hypertas_feature_init(const char *hypertas,
  74                                             unsigned long len)
  75 {
  76         const char *s;
  77         int i;
  78
  79         pr_debug(" -> fw_hypertas_feature_init()\n");
  80
  81         for (s = hypertas; s < hypertas + len; s += strlen(s) + 1) {
  82                 for (i = 0; i < ARRAY_SIZE(hypertas_fw_features_table); i++) {
  83                         const char *name = hypertas_fw_features_table[i].name;
  84                         size_t size;
  85
  86                         /*
  87                          * If there is a '*' at the end of name, only check
  88                          * upto there
  89                          */
  90                         size = strlen(name);
  91                         if (size && name[size - 1] == '*') {
  92                                 if (strncmp(name, s, size - 1))
  93                                         continue;
  94                         } else if (strcmp(name, s))
  95                                 continue;
  96
  97                         /* we have a match */
  98                         powerpc_firmware_features |=
  99                                 hypertas_fw_features_table[i].val;
 100                         break;
 101                 }
 102         }
 103
 104         pr_debug(" <- fw_hypertas_feature_init()\n");
 105 }
 106
 107 struct vec5_fw_feature {
 108         unsigned long   val;
 109         unsigned int    feature;
 110 };
 111
 112 static __initdata struct vec5_fw_feature
 113 vec5_fw_features_table[] = {
 114         {FW_FEATURE_TYPE1_AFFINITY,     OV5_TYPE1_AFFINITY},
 115         {FW_FEATURE_PRRN,               OV5_PRRN},
 116 };
 117
 118 static void __init fw_vec5_feature_init(const char *vec5, unsigned long len)
 119 {
 120         unsigned int index, feat;
 121         int i;
 122
 123         pr_debug(" -> fw_vec5_feature_init()\n");
 124
 125         for (i = 0; i < ARRAY_SIZE(vec5_fw_features_table); i++) {
 126                 index = OV5_INDX(vec5_fw_features_table[i].feature);
 127                 feat = OV5_FEAT(vec5_fw_features_table[i].feature);
 128
 129                 if (vec5[index] & feat)
 130                         powerpc_firmware_features |=
 131                                 vec5_fw_features_table[i].val;
 132         }
 133
 134         pr_debug(" <- fw_vec5_feature_init()\n");
 135 }
 136
 137 /*
 138  * Called very early, MMU is off, device-tree isn't unflattened
 139  */
 140 static int __init probe_fw_features(unsigned long node, const char *uname, int
 141                                     depth, void *data)
 142 {
 143         const char *prop;
 144         int len;
 145         static int hypertas_found;
 146         static int vec5_found;
 147
 148         if (depth != 1)
 149                 return 0;
 150
 151         if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
 152                 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
 153                                            &len);
 154                 if (prop) {
 155                         powerpc_firmware_features |= FW_FEATURE_LPAR;
 156                         fw_hypertas_feature_init(prop, len);
 157                 }
 158
 159                 hypertas_found = 1;
 160         }
 161
 162         if (!strcmp(uname, "chosen")) {
 163                 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
 164                                            &len);
 165                 if (prop)
 166                         fw_vec5_feature_init(prop, len);
 167
 168                 vec5_found = 1;
 169         }
 170
 171         return hypertas_found && vec5_found;
 172 }
 173
 174 void __init pseries_probe_fw_features(void)
 175 {
 176         of_scan_flat_dt(probe_fw_features, NULL);
 177 }