arch/powerpc/platforms/iseries/vio.c

   1 /*
   2  * Legacy iSeries specific vio initialisation
   3  * that needs to be built in (not a module).
   4  *
   5  * Â© Copyright 2007 IBM Corporation
   6  *      Author: Stephen Rothwell
   7  *      Some parts collected from various other files
   8  *
   9  * This program is free software;  you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23 #include <linux/of.h>
  24 #include <linux/init.h>
  25 #include <linux/gfp.h>
  26 #include <linux/completion.h>
  27 #include <linux/proc_fs.h>
  28
  29 #include <asm/firmware.h>
  30 #include <asm/iseries/vio.h>
  31 #include <asm/iseries/iommu.h>
  32 #include <asm/iseries/hv_types.h>
  33 #include <asm/iseries/hv_lp_event.h>
  34
  35 #define FIRST_VTY       0
  36 #define NUM_VTYS        1
  37 #define FIRST_VSCSI     (FIRST_VTY + NUM_VTYS)
  38 #define NUM_VSCSIS      1
  39 #define FIRST_VLAN      (FIRST_VSCSI + NUM_VSCSIS)
  40 #define NUM_VLANS       HVMAXARCHITECTEDVIRTUALLANS
  41 #define FIRST_VIODASD   (FIRST_VLAN + NUM_VLANS)
  42 #define NUM_VIODASDS    HVMAXARCHITECTEDVIRTUALDISKS
  43 #define FIRST_VIOCD     (FIRST_VIODASD + NUM_VIODASDS)
  44 #define NUM_VIOCDS      HVMAXARCHITECTEDVIRTUALCDROMS
  45 #define FIRST_VIOTAPE   (FIRST_VIOCD + NUM_VIOCDS)
  46 #define NUM_VIOTAPES    HVMAXARCHITECTEDVIRTUALTAPES
  47
  48 static struct property * __init new_property(const char *name, int length,
  49                 const void *value)
  50 {
  51         struct property *np = kzalloc(sizeof(*np) + strlen(name) + 1 + length,
  52                         GFP_KERNEL);
  53
  54         if (!np)
  55                 return NULL;
  56         np->name = (char *)(np + 1);
  57         np->value = np->name + strlen(name) + 1;
  58         strcpy(np->name, name);
  59         memcpy(np->value, value, length);
  60         np->length = length;
  61         return np;
  62 }
  63
  64 static void __init free_property(struct property *np)
  65 {
  66         kfree(np);
  67 }
  68
  69 static struct device_node * __init new_node(const char *path,
  70                 struct device_node *parent)
  71 {
  72         struct device_node *np = kzalloc(sizeof(*np), GFP_KERNEL);
  73
  74         if (!np)
  75                 return NULL;
  76         np->full_name = kmalloc(strlen(path) + 1, GFP_KERNEL);
  77         if (!np->full_name) {
  78                 kfree(np);
  79                 return NULL;
  80         }
  81         strcpy(np->full_name, path);
  82         of_node_set_flag(np, OF_DYNAMIC);
  83         kref_init(&np->kref);
  84         np->parent = of_node_get(parent);
  85         return np;
  86 }
  87
  88 static void __init free_node(struct device_node *np)
  89 {
  90         struct property *next;
  91         struct property *prop;
  92
  93         next = np->properties;
  94         while (next) {
  95                 prop = next;
  96                 next = prop->next;
  97                 free_property(prop);
  98         }
  99         of_node_put(np->parent);
 100         kfree(np->full_name);
 101         kfree(np);
 102 }
 103
 104 static int __init add_string_property(struct device_node *np, const char *name,
 105                 const char *value)
 106 {
 107         struct property *nprop = new_property(name, strlen(value) + 1, value);
 108
 109         if (!nprop)
 110                 return 0;
 111         prom_add_property(np, nprop);
 112         return 1;
 113 }
 114
 115 static int __init add_raw_property(struct device_node *np, const char *name,
 116                 int length, const void *value)
 117 {
 118         struct property *nprop = new_property(name, length, value);
 119
 120         if (!nprop)
 121                 return 0;
 122         prom_add_property(np, nprop);
 123         return 1;
 124 }
 125
 126 struct viocd_waitevent {
 127         struct completion       com;
 128         int                     rc;
 129         u16                     sub_result;
 130 };
 131
 132 struct cdrom_info {
 133         char    rsrcname[10];
 134         char    type[4];
 135         char    model[3];
 136 };
 137
 138 static void __init handle_cd_event(struct HvLpEvent *event)
 139 {
 140         struct viocdlpevent *bevent;
 141         struct viocd_waitevent *pwe;
 142
 143         if (!event)
 144                 /* Notification that a partition went away! */
 145                 return;
 146
 147         /* First, we should NEVER get an int here...only acks */
 148         if (hvlpevent_is_int(event)) {
 149                 printk(KERN_WARNING "handle_cd_event: got an unexpected int\n");
 150                 if (hvlpevent_need_ack(event)) {
 151                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 152                         HvCallEvent_ackLpEvent(event);
 153                 }
 154                 return;
 155         }
 156
 157         bevent = (struct viocdlpevent *)event;
 158
 159         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
 160         case viocdgetinfo:
 161                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 162                 pwe->rc = event->xRc;
 163                 pwe->sub_result = bevent->sub_result;
 164                 complete(&pwe->com);
 165                 break;
 166
 167         default:
 168                 printk(KERN_WARNING "handle_cd_event: "
 169                         "message with unexpected subtype %0x04X!\n",
 170                         event->xSubtype & VIOMINOR_SUBTYPE_MASK);
 171                 if (hvlpevent_need_ack(event)) {
 172                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 173                         HvCallEvent_ackLpEvent(event);
 174                 }
 175         }
 176 }
 177
 178 static void __init get_viocd_info(struct device_node *vio_root)
 179 {
 180         HvLpEvent_Rc hvrc;
 181         u32 unit;
 182         struct viocd_waitevent we;
 183         struct cdrom_info *unitinfo;
 184         dma_addr_t unitinfo_dmaaddr;
 185         int ret;
 186
 187         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio, 2);
 188         if (ret) {
 189                 printk(KERN_WARNING
 190                         "get_viocd_info: error opening path to host partition %d\n",
 191                         viopath_hostLp);
 192                 return;
 193         }
 194
 195         /* Initialize our request handler */
 196         vio_setHandler(viomajorsubtype_cdio, handle_cd_event);
 197
 198         unitinfo = iseries_hv_alloc(
 199                         sizeof(*unitinfo) * HVMAXARCHITECTEDVIRTUALCDROMS,
 200                         &unitinfo_dmaaddr, GFP_ATOMIC);
 201         if (!unitinfo) {
 202                 printk(KERN_WARNING
 203                         "get_viocd_info: error allocating unitinfo\n");
 204                 goto clear_handler;
 205         }
 206
 207         memset(unitinfo, 0, sizeof(*unitinfo) * HVMAXARCHITECTEDVIRTUALCDROMS);
 208
 209         init_completion(&we.com);
 210
 211         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 212                         HvLpEvent_Type_VirtualIo,
 213                         viomajorsubtype_cdio | viocdgetinfo,
 214                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 215                         viopath_sourceinst(viopath_hostLp),
 216                         viopath_targetinst(viopath_hostLp),
 217                         (u64)&we, VIOVERSION << 16, unitinfo_dmaaddr, 0,
 218                         sizeof(*unitinfo) * HVMAXARCHITECTEDVIRTUALCDROMS, 0);
 219         if (hvrc != HvLpEvent_Rc_Good) {
 220                 printk(KERN_WARNING
 221                         "get_viocd_info: cdrom error sending event. rc %d\n",
 222                         (int)hvrc);
 223                 goto hv_free;
 224         }
 225
 226         wait_for_completion(&we.com);
 227
 228         if (we.rc) {
 229                 printk(KERN_WARNING "get_viocd_info: bad rc %d:0x%04X\n",
 230                         we.rc, we.sub_result);
 231                 goto hv_free;
 232         }
 233
 234         for (unit = 0; (unit < HVMAXARCHITECTEDVIRTUALCDROMS) &&
 235                         unitinfo[unit].rsrcname[0]; unit++) {
 236                 struct device_node *np;
 237                 char name[64];
 238                 u32 reg = FIRST_VIOCD + unit;
 239
 240                 snprintf(name, sizeof(name), "/vdevice/viocd@%08x", reg);
 241                 np = new_node(name, vio_root);
 242                 if (!np)
 243                         goto hv_free;
 244                 if (!add_string_property(np, "name", "viocd") ||
 245                         !add_string_property(np, "device_type", "block") ||
 246                         !add_string_property(np, "compatible",
 247                                 "IBM,iSeries-viocd") ||
 248                         !add_raw_property(np, "reg", sizeof(reg), &reg) ||
 249                         !add_raw_property(np, "linux,unit_address",
 250                                 sizeof(unit), &unit) ||
 251                         !add_raw_property(np, "linux,vio_rsrcname",
 252                                 sizeof(unitinfo[unit].rsrcname),
 253                                 unitinfo[unit].rsrcname) ||
 254                         !add_raw_property(np, "linux,vio_type",
 255                                 sizeof(unitinfo[unit].type),
 256                                 unitinfo[unit].type) ||
 257                         !add_raw_property(np, "linux,vio_model",
 258                                 sizeof(unitinfo[unit].model),
 259                                 unitinfo[unit].model))
 260                         goto node_free;
 261                 np->name = of_get_property(np, "name", NULL);
 262                 np->type = of_get_property(np, "device_type", NULL);
 263                 of_attach_node(np);
 264 #ifdef CONFIG_PROC_DEVICETREE
 265                 if (vio_root->pde) {
 266                         struct proc_dir_entry *ent;
 267
 268                         ent = proc_mkdir(strrchr(np->full_name, '/') + 1,
 269                                         vio_root->pde);
 270                         if (ent)
 271                                 proc_device_tree_add_node(np, ent);
 272                 }
 273 #endif
 274                 continue;
 275
 276  node_free:
 277                 free_node(np);
 278                 break;
 279         }
 280
 281  hv_free:
 282         iseries_hv_free(sizeof(*unitinfo) * HVMAXARCHITECTEDVIRTUALCDROMS,
 283                         unitinfo, unitinfo_dmaaddr);
 284  clear_handler:
 285         vio_clearHandler(viomajorsubtype_cdio);
 286         viopath_close(viopath_hostLp, viomajorsubtype_cdio, 2);
 287 }
 288
 289 static int __init iseries_vio_init(void)
 290 {
 291         struct device_node *vio_root;
 292
 293         if (!firmware_has_feature(FW_FEATURE_ISERIES))
 294                 return -ENODEV;
 295
 296         iommu_vio_init();
 297
 298         vio_root = of_find_node_by_path("/vdevice");
 299         if (!vio_root)
 300                 return -ENODEV;
 301
 302         if (viopath_hostLp == HvLpIndexInvalid) {
 303                 vio_set_hostlp();
 304                 /* If we don't have a host, bail out */
 305                 if (viopath_hostLp == HvLpIndexInvalid)
 306                         goto put_node;
 307         }
 308
 309         get_viocd_info(vio_root);
 310
 311         return 0;
 312
 313  put_node:
 314         of_node_put(vio_root);
 315         return -ENODEV;
 316 }
 317 arch_initcall(iseries_vio_init);