src/devices/hypertransport.c

   1 #include <bitops.h>
   2 #include <console/console.h>
   3 #include <device/device.h>
   4 #include <device/path.h>
   5 #include <device/pci.h>
   6 #include <device/hypertransport.h>
   7 #include <device/chip.h>
   8 #include <part/hard_reset.h>
   9 #include <part/fallback_boot.h>
  10
  11 static device_t ht_scan_get_devs(device_t *old_devices)
  12 {
  13         device_t first, last;
  14         first = *old_devices;
  15         last = first;
  16         while(last && last->sibling &&
  17                 (last->sibling->path.type == DEVICE_PATH_PCI) &&
  18                 (last->sibling->path.u.pci.devfn > last->path.u.pci.devfn)) {
  19                 last = last->sibling;
  20         }
  21         if (first) {
  22                 *old_devices = last->sibling;
  23                 last->sibling = 0;
  24         }
  25         return first;
  26 }
  27
  28
  29 struct prev_link {
  30         struct device *dev;
  31         unsigned pos;
  32         unsigned char config_off, freq_off, freq_cap_off;
  33 };
  34
  35 static int ht_setup_link(struct prev_link *prev, device_t dev, unsigned pos)
  36 {
  37         static const uint8_t link_width_to_pow2[]= { 3, 4, 0, 5, 1, 2, 0, 0 };
  38         static const uint8_t pow2_to_link_width[] = { 0x7, 4, 5, 0, 1, 3 };
  39         unsigned present_width_cap,    upstream_width_cap;
  40         unsigned present_freq_cap,     upstream_freq_cap;
  41         unsigned ln_present_width_in,  ln_upstream_width_in;
  42         unsigned ln_present_width_out, ln_upstream_width_out;
  43         unsigned freq, old_freq;
  44         unsigned present_width, upstream_width, old_width;
  45         int reset_needed;
  46
  47         /* Set the hypertransport link width and frequency */
  48         reset_needed = 0;
  49
  50         /* Read the capabilities */
  51         present_freq_cap   = pci_read_config16(dev, pos + PCI_HT_CAP_SLAVE_FREQ_CAP0);
  52         upstream_freq_cap  = pci_read_config16(prev->dev, prev->pos + prev->freq_cap_off);
  53         present_width_cap  = pci_read_config8(dev, pos + PCI_HT_CAP_SLAVE_WIDTH0);
  54         upstream_width_cap = pci_read_config8(prev->dev, prev->pos + prev->config_off);
  55
  56         /* Calculate the highest useable frequency */
  57 #if 0
  58         freq = log2(present_freq_cap & upstream_freq_cap);
  59 #else
  60         /* Errata for 8131 - freq 5 has hardware problems don't support it */
  61         freq = log2(present_freq_cap & upstream_freq_cap & 0x1f);
  62 #endif
  63
  64         /* Calculate the highest width */
  65         ln_upstream_width_in = link_width_to_pow2[upstream_width_cap & 7];
  66         ln_present_width_out = link_width_to_pow2[(present_width_cap >> 4) & 7];
  67         if (ln_upstream_width_in > ln_present_width_out) {
  68                 ln_upstream_width_in = ln_present_width_out;
  69         }
  70         upstream_width = pow2_to_link_width[ln_upstream_width_in];
  71         present_width  = pow2_to_link_width[ln_upstream_width_in] << 4;
  72
  73         ln_upstream_width_out = link_width_to_pow2[(upstream_width_cap >> 4) & 7];
  74         ln_present_width_in   = link_width_to_pow2[present_width_cap & 7];
  75         if (ln_upstream_width_out > ln_present_width_in) {
  76                 ln_upstream_width_out = ln_present_width_in;
  77         }
  78         upstream_width |= pow2_to_link_width[ln_upstream_width_out] << 4;
  79         present_width  |= pow2_to_link_width[ln_upstream_width_out];
  80
  81         /* Set the current device */
  82         old_freq = pci_read_config8(dev, pos + PCI_HT_CAP_SLAVE_FREQ0);
  83         if (freq != old_freq) {
  84                 pci_write_config8(dev, pos + PCI_HT_CAP_SLAVE_FREQ0, freq);
  85                 reset_needed = 1;
  86                 printk_spew("HyperT FreqP old %x new %x\n",old_freq,freq);
  87         }
  88         old_width = pci_read_config8(dev, pos + PCI_HT_CAP_SLAVE_WIDTH0 + 1);
  89         if (present_width != old_width) {
  90                 pci_write_config8(dev, pos + PCI_HT_CAP_SLAVE_WIDTH0 + 1, present_width);
  91                 reset_needed = 1;
  92                 printk_spew("HyperT widthP old %x new %x\n",old_width, present_width);
  93         }
  94
  95         /* Set the upstream device */
  96         old_freq = pci_read_config8(prev->dev, prev->pos + prev->freq_off);
  97         old_freq &= 0x0f;
  98         if (freq != old_freq) {
  99                 pci_write_config8(prev->dev, prev->pos + prev->freq_off, freq);
 100                 reset_needed = 1;
 101                 printk_spew("HyperT freqU old %x new %x\n", old_freq, freq);
 102         }
 103         old_width = pci_read_config8(prev->dev, prev->pos + prev->config_off + 1);
 104         if (upstream_width != old_width) {
 105                 pci_write_config8(prev->dev, prev->pos + prev->config_off + 1, upstream_width);
 106                 reset_needed = 1;
 107                 printk_spew("HyperT widthU old %x new %x\n", old_width, upstream_width);
 108         }
 109
 110         /* Remember the current link as the previous link */
 111         prev->dev = dev;
 112         prev->pos = pos;
 113         prev->config_off   = PCI_HT_CAP_SLAVE_WIDTH1;
 114         prev->freq_off     = PCI_HT_CAP_SLAVE_FREQ1;
 115         prev->freq_cap_off = PCI_HT_CAP_SLAVE_FREQ_CAP1;
 116
 117         return reset_needed;
 118
 119 }
 120
 121 static unsigned ht_lookup_slave_capability(struct device *dev)
 122 {
 123         unsigned pos;
 124         pos = 0;
 125         switch(dev->hdr_type & 0x7f) {
 126         case PCI_HEADER_TYPE_NORMAL:
 127         case PCI_HEADER_TYPE_BRIDGE:
 128                 pos = PCI_CAPABILITY_LIST;
 129                 break;
 130         }
 131         if (pos > PCI_CAP_LIST_NEXT) {
 132                 pos = pci_read_config8(dev, pos);
 133         }
 134         while(pos != 0) {   /* loop through the linked list */
 135                 uint8_t cap;
 136                 cap = pci_read_config8(dev, pos + PCI_CAP_LIST_ID);
 137                 printk_spew("Capability: 0x%02x @ 0x%02x\n", cap, pos);
 138                 if (cap == PCI_CAP_ID_HT) {
 139                         unsigned flags;
 140                         flags = pci_read_config16(dev, pos + PCI_CAP_FLAGS);
 141                         printk_spew("flags: 0x%04x\n", (unsigned)flags);
 142                         if ((flags >> 13) == 0) {
 143                                 /* Entry is a Slave secondary, success...*/
 144                                 break;
 145                         }
 146                 }
 147                 if(pos) {
 148                         pos = pci_read_config8(dev, pos + PCI_CAP_LIST_NEXT);
 149                 }
 150         }
 151         return pos;
 152 }
 153
 154 static void ht_collapse_early_enumeration(struct bus *bus)
 155 {
 156         unsigned int devfn;
 157
 158         /* Spin through the devices and collapse any early
 159          * hypertransport enumeration.
 160          */
 161         for(devfn = 0; devfn <= 0xff; devfn += 8) {
 162                 struct device dummy;
 163                 uint32_t id;
 164                 unsigned pos, flags;
 165                 dummy.bus              = bus;
 166                 dummy.path.type        = DEVICE_PATH_PCI;
 167                 dummy.path.u.pci.devfn = devfn;
 168                 id = pci_read_config32(&dummy, PCI_VENDOR_ID);
 169                 if (id == 0xffffffff || id == 0x00000000 ||
 170                         id == 0x0000ffff || id == 0xffff0000) {
 171                         continue;
 172                 }
 173                 dummy.vendor = id & 0xffff;
 174                 dummy.device = (id >> 16) & 0xffff;
 175                 dummy.hdr_type = pci_read_config8(&dummy, PCI_HEADER_TYPE);
 176                 pos = ht_lookup_slave_capability(&dummy);
 177                 if (!pos){
 178                         continue;
 179                 }
 180
 181                 /* Clear the unitid */
 182                 flags = pci_read_config16(&dummy, pos + PCI_CAP_FLAGS);
 183                 flags &= ~0x1f;
 184                 pci_write_config16(&dummy, pos + PCI_CAP_FLAGS, flags);
 185                 printk_spew("Collapsing %s [%04x/%04x]\n",
 186                         dev_path(&dummy), dummy.vendor, dummy.device);
 187         }
 188 }
 189
 190 unsigned int hypertransport_scan_chain(struct bus *bus, unsigned int max)
 191 {
 192         unsigned next_unitid, last_unitid, previous_unitid;
 193         uint8_t previous_pos;
 194         device_t old_devices, dev, func, *chain_last;
 195         unsigned min_unitid = 1;
 196         int reset_needed;
 197         struct prev_link prev;
 198
 199         /* Restore the hypertransport chain to it's unitialized state */
 200         ht_collapse_early_enumeration(bus);
 201
 202         /* See which static device nodes I have */
 203         old_devices = bus->children;
 204         bus->children = 0;
 205         chain_last = &bus->children;
 206
 207         /* Initialize the hypertransport enumeration state */
 208         reset_needed = 0;
 209         prev.dev = bus->dev;
 210         prev.pos = bus->cap;
 211         prev.config_off   = PCI_HT_CAP_HOST_WIDTH;
 212         prev.freq_off     = PCI_HT_CAP_HOST_FREQ;
 213         prev.freq_cap_off = PCI_HT_CAP_HOST_FREQ_CAP;
 214
 215         /* If present assign unitid to a hypertransport chain */
 216         last_unitid = min_unitid -1;
 217         next_unitid = min_unitid;
 218         previous_pos = 0;
 219         do {
 220                 uint32_t id, class;
 221                 uint8_t hdr_type, pos;
 222                 uint16_t flags;
 223                 unsigned count, static_count;
 224
 225                 previous_unitid = last_unitid;
 226                 last_unitid = next_unitid;
 227
 228                 /* Get setup the device_structure */
 229                 dev = ht_scan_get_devs(&old_devices);
 230
 231                 if (!dev) {
 232                         struct device dummy;
 233                         dummy.bus              = bus;
 234                         dummy.path.type        = DEVICE_PATH_PCI;
 235                         dummy.path.u.pci.devfn = 0;
 236                         id = pci_read_config32(&dummy, PCI_VENDOR_ID);
 237                         /* If the chain is fully enumerated quit */
 238                         if (id == 0xffffffff || id == 0x00000000 ||
 239                                 id == 0x0000ffff || id == 0xffff0000) {
 240                                 break;
 241                         }
 242                         dev = alloc_dev(bus, &dummy.path);
 243                 }
 244                 else {
 245                         /* Add this device to the pci bus chain */
 246                         *chain_last = dev;
 247                         /* Run the magice enable/disable sequence for the device */
 248                         if (dev->chip && dev->chip->control && dev->chip->control->enable_dev) {
 249                                 dev->chip->control->enable_dev(dev);
 250                         }
 251                         /* Now read the vendor and device id */
 252                         id = pci_read_config32(dev, PCI_VENDOR_ID);
 253
 254                         /* If the chain is fully enumerated quit */
 255                         if (id == 0xffffffff || id == 0x00000000 ||
 256                                 id == 0x0000ffff || id == 0xffff0000) {
 257                                 printk_err("Missing static device: %s\n",
 258                                         dev_path(dev));
 259                                 break;
 260                         }
 261                 }
 262                 /* Update the device chain tail */
 263                 for(func = dev; func; func = func->sibling) {
 264                         chain_last = &func->sibling;
 265                 }
 266
 267                 /* Read the rest of the pci configuration information */
 268                 hdr_type = pci_read_config8(dev, PCI_HEADER_TYPE);
 269                 class = pci_read_config32(dev, PCI_CLASS_REVISION);
 270
 271                 /* Store the interesting information in the device structure */
 272                 dev->vendor = id & 0xffff;
 273                 dev->device = (id >> 16) & 0xffff;
 274                 dev->hdr_type = hdr_type;
 275                 /* class code, the upper 3 bytes of PCI_CLASS_REVISION */
 276                 dev->class = class >> 8;
 277
 278                 /* Find the hypertransport link capability */
 279                 pos = ht_lookup_slave_capability(dev);
 280                 if (pos == 0) {
 281                         printk_err("%s Hypertransport link capability not found",
 282                                 dev_path(dev));
 283                         break;
 284                 }
 285
 286                 /* Update the Unitid of the current device */
 287                 flags = pci_read_config16(dev, pos + PCI_CAP_FLAGS);
 288                 flags &= ~0x1f; /* mask out base Unit ID */
 289                 flags |= next_unitid & 0x1f;
 290                 pci_write_config16(dev, pos + PCI_CAP_FLAGS, flags);
 291
 292                 /* Update the Unitd id in the device structure */
 293                 static_count = 1;
 294                 for(func = dev; func; func = func->sibling) {
 295                         func->path.u.pci.devfn += (next_unitid << 3);
 296                         static_count = (func->path.u.pci.devfn >> 3)
 297                                 - (dev->path.u.pci.devfn >> 3) + 1;
 298                 }
 299
 300                 /* Compute the number of unitids consumed */
 301                 count = (flags >> 5) & 0x1f; /* get unit count */
 302                 printk_spew("%s count: %04x static_count: %04x\n",
 303                         dev_path(dev), count, static_count);
 304                 if (count < static_count) {
 305                         count = static_count;
 306                 }
 307
 308                 /* Update the Unitid of the next device */
 309                 next_unitid += count;
 310
 311                 /* Setup the hypetransport link */
 312                 reset_needed |= ht_setup_link(&prev, dev, pos);
 313
 314                 printk_debug("%s [%04x/%04x] %s next_unitid: %04x\n",
 315                         dev_path(dev),
 316                         dev->vendor, dev->device,
 317                         (dev->enable? "enabled": "disabled"), next_unitid);
 318
 319         } while((last_unitid != next_unitid) && (next_unitid <= 0x1f));
 320 #if HAVE_HARD_RESET == 1
 321         if(reset_needed) {
 322                 printk_info("HyperT reset needed\n");
 323                 hard_reset();
 324         }
 325         printk_debug("HyperT reset not needed\n");
 326 #endif
 327         if (next_unitid > 0x1f) {
 328                 next_unitid = 0x1f;
 329         }
 330         return pci_scan_bus(bus, 0x00, (next_unitid << 3)|7, max);
 331 }