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