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 #undef DEBUG
  25
  26 #include <asm/firmware.h>
  27 #include <asm/prom.h>
  28
  29 #ifdef DEBUG
  30 #define DBG(fmt...) udbg_printf(fmt)
  31 #else
  32 #define DBG(fmt...)
  33 #endif
  34
  35 typedef struct {
  36     unsigned long val;
  37     char * name;
  38 } firmware_feature_t;
  39
  40 static __initdata firmware_feature_t
  41 firmware_features_table[FIRMWARE_MAX_FEATURES] = {
  42         {FW_FEATURE_PFT,                "hcall-pft"},
  43         {FW_FEATURE_TCE,                "hcall-tce"},
  44         {FW_FEATURE_SPRG0,              "hcall-sprg0"},
  45         {FW_FEATURE_DABR,               "hcall-dabr"},
  46         {FW_FEATURE_COPY,               "hcall-copy"},
  47         {FW_FEATURE_ASR,                "hcall-asr"},
  48         {FW_FEATURE_DEBUG,              "hcall-debug"},
  49         {FW_FEATURE_PERF,               "hcall-perf"},
  50         {FW_FEATURE_DUMP,               "hcall-dump"},
  51         {FW_FEATURE_INTERRUPT,          "hcall-interrupt"},
  52         {FW_FEATURE_MIGRATE,            "hcall-migrate"},
  53         {FW_FEATURE_PERFMON,            "hcall-perfmon"},
  54         {FW_FEATURE_CRQ,                "hcall-crq"},
  55         {FW_FEATURE_VIO,                "hcall-vio"},
  56         {FW_FEATURE_RDMA,               "hcall-rdma"},
  57         {FW_FEATURE_LLAN,               "hcall-lLAN"},
  58         {FW_FEATURE_BULK,               "hcall-bulk"},
  59         {FW_FEATURE_XDABR,              "hcall-xdabr"},
  60         {FW_FEATURE_MULTITCE,           "hcall-multi-tce"},
  61         {FW_FEATURE_SPLPAR,             "hcall-splpar"},
  62 };
  63
  64 /* Build up the firmware features bitmask using the contents of
  65  * device-tree/ibm,hypertas-functions.  Ultimately this functionality may
  66  * be moved into prom.c prom_init().
  67  */
  68 void __init fw_feature_init(void)
  69 {
  70         struct device_node *dn;
  71         const char *hypertas, *s;
  72         int len, i;
  73
  74         DBG(" -> fw_feature_init()\n");
  75
  76         dn = of_find_node_by_path("/rtas");
  77         if (dn == NULL) {
  78                 printk(KERN_ERR "WARNING! Cannot find RTAS in device-tree!\n");
  79                 goto out;
  80         }
  81
  82         hypertas = get_property(dn, "ibm,hypertas-functions", &len);
  83         if (hypertas == NULL)
  84                 goto out;
  85
  86         for (s = hypertas; s < hypertas + len; s += strlen(s) + 1) {
  87                 for (i = 0; i < FIRMWARE_MAX_FEATURES; i++) {
  88                         /* check value against table of strings */
  89                         if (!firmware_features_table[i].name ||
  90                             strcmp(firmware_features_table[i].name, s))
  91                                 continue;
  92
  93                         /* we have a match */
  94                         powerpc_firmware_features |=
  95                                 firmware_features_table[i].val;
  96                         break;
  97                 }
  98         }
  99
 100 out:
 101         of_node_put(dn);
 102         DBG(" <- fw_feature_init()\n");
 103 }