2 #include <console/console.h>
3 #include <device/device.h>
4 #include <device/path.h>
5 #include <device/pci.h>
6 #include <device/pci_ids.h>
7 #include <device/hypertransport.h>
8 #include <part/hard_reset.h>
9 #include <part/fallback_boot.h>
11 static device_t ht_scan_get_devs(device_t *old_devices)
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)) {
22 *old_devices = last->sibling;
28 static unsigned ht_read_freq_cap(device_t dev, unsigned pos)
30 /* Handle bugs in valid hypertransport frequency reporting */
33 freq_cap = pci_read_config16(dev, pos);
34 freq_cap &= ~(1 << HT_FREQ_VENDOR); /* Ignore Vendor HT frequencies */
36 /* AMD 8131 Errata 48 */
37 if ((dev->vendor == PCI_VENDOR_ID_AMD) &&
38 (dev->device == PCI_DEVICE_ID_AMD_8131_PCIX)) {
39 freq_cap &= ~(1 << HT_FREQ_800Mhz);
41 /* AMD 8151 Errata 23 */
42 if ((dev->vendor == PCI_VENDOR_ID_AMD) &&
43 (dev->device == PCI_DEVICE_ID_AMD_8151_SYSCTRL)) {
44 freq_cap &= ~(1 << HT_FREQ_800Mhz);
46 /* AMD K8 Unsupported 1Ghz? */
47 if ((dev->vendor == PCI_VENDOR_ID_AMD) && (dev->device == 0x1100)) {
48 freq_cap &= ~(1 << HT_FREQ_1000Mhz);
56 unsigned char config_off, freq_off, freq_cap_off;
59 static int ht_setup_link(struct prev_link *prev, device_t dev, unsigned pos)
61 static const uint8_t link_width_to_pow2[]= { 3, 4, 0, 5, 1, 2, 0, 0 };
62 static const uint8_t pow2_to_link_width[] = { 0x7, 4, 5, 0, 1, 3 };
63 unsigned present_width_cap, upstream_width_cap;
64 unsigned present_freq_cap, upstream_freq_cap;
65 unsigned ln_present_width_in, ln_upstream_width_in;
66 unsigned ln_present_width_out, ln_upstream_width_out;
67 unsigned freq, old_freq;
68 unsigned present_width, upstream_width, old_width;
72 /* Set the hypertransport link width and frequency */
74 linkb_to_host = (pci_read_config16(dev, pos + PCI_CAP_FLAGS) >> 10) & 1;
76 /* Read the capabilities */
77 present_freq_cap = ht_read_freq_cap(dev, pos + (linkb_to_host ? PCI_HT_CAP_SLAVE_FREQ_CAP1: PCI_HT_CAP_SLAVE_FREQ_CAP0));
78 upstream_freq_cap = ht_read_freq_cap(prev->dev, prev->pos + prev->freq_cap_off);
79 present_width_cap = pci_read_config8(dev, pos + (linkb_to_host ? PCI_HT_CAP_SLAVE_WIDTH1: PCI_HT_CAP_SLAVE_WIDTH0));
80 upstream_width_cap = pci_read_config8(prev->dev, prev->pos + prev->config_off);
82 /* Calculate the highest useable frequency */
83 freq = log2(present_freq_cap & upstream_freq_cap);
85 /* Calculate the highest width */
86 ln_upstream_width_in = link_width_to_pow2[upstream_width_cap & 7];
87 ln_present_width_out = link_width_to_pow2[(present_width_cap >> 4) & 7];
88 if (ln_upstream_width_in > ln_present_width_out) {
89 ln_upstream_width_in = ln_present_width_out;
91 upstream_width = pow2_to_link_width[ln_upstream_width_in];
92 present_width = pow2_to_link_width[ln_upstream_width_in] << 4;
94 ln_upstream_width_out = link_width_to_pow2[(upstream_width_cap >> 4) & 7];
95 ln_present_width_in = link_width_to_pow2[present_width_cap & 7];
96 if (ln_upstream_width_out > ln_present_width_in) {
97 ln_upstream_width_out = ln_present_width_in;
99 upstream_width |= pow2_to_link_width[ln_upstream_width_out] << 4;
100 present_width |= pow2_to_link_width[ln_upstream_width_out];
102 /* Set the current device */
103 old_freq = pci_read_config8(dev, pos + (linkb_to_host ? PCI_HT_CAP_SLAVE_FREQ1:PCI_HT_CAP_SLAVE_FREQ0));
104 if (freq != old_freq) {
105 pci_write_config8(dev, pos + (linkb_to_host ? PCI_HT_CAP_SLAVE_FREQ1:PCI_HT_CAP_SLAVE_FREQ0), freq);
107 printk_spew("HyperT FreqP old %x new %x\n",old_freq,freq);
109 old_width = pci_read_config8(dev, pos + (linkb_to_host ? PCI_HT_CAP_SLAVE_WIDTH1: PCI_HT_CAP_SLAVE_WIDTH0) + 1);
110 if (present_width != old_width) {
111 pci_write_config8(dev, pos + (linkb_to_host ? PCI_HT_CAP_SLAVE_WIDTH1: PCI_HT_CAP_SLAVE_WIDTH0) + 1, present_width);
113 printk_spew("HyperT widthP old %x new %x\n",old_width, present_width);
116 /* Set the upstream device */
117 old_freq = pci_read_config8(prev->dev, prev->pos + prev->freq_off);
119 if (freq != old_freq) {
120 pci_write_config8(prev->dev, prev->pos + prev->freq_off, freq);
122 printk_spew("HyperT freqU old %x new %x\n", old_freq, freq);
124 old_width = pci_read_config8(prev->dev, prev->pos + prev->config_off + 1);
125 if (upstream_width != old_width) {
126 pci_write_config8(prev->dev, prev->pos + prev->config_off + 1, upstream_width);
128 printk_spew("HyperT widthU old %x new %x\n", old_width, upstream_width);
131 /* Remember the current link as the previous link */
135 prev->config_off = PCI_HT_CAP_SLAVE_WIDTH0;
136 prev->freq_off = PCI_HT_CAP_SLAVE_FREQ0;
137 prev->freq_cap_off = PCI_HT_CAP_SLAVE_FREQ_CAP0;
140 prev->config_off = PCI_HT_CAP_SLAVE_WIDTH1;
141 prev->freq_off = PCI_HT_CAP_SLAVE_FREQ1;
142 prev->freq_cap_off = PCI_HT_CAP_SLAVE_FREQ_CAP1;
149 static unsigned ht_lookup_slave_capability(struct device *dev)
153 switch(dev->hdr_type & 0x7f) {
154 case PCI_HEADER_TYPE_NORMAL:
155 case PCI_HEADER_TYPE_BRIDGE:
156 pos = PCI_CAPABILITY_LIST;
159 if (pos > PCI_CAP_LIST_NEXT) {
160 pos = pci_read_config8(dev, pos);
162 while(pos != 0) { /* loop through the linked list */
164 cap = pci_read_config8(dev, pos + PCI_CAP_LIST_ID);
165 printk_spew("Capability: 0x%02x @ 0x%02x\n", cap, pos);
166 if (cap == PCI_CAP_ID_HT) {
168 flags = pci_read_config16(dev, pos + PCI_CAP_FLAGS);
169 printk_spew("flags: 0x%04x\n", (unsigned)flags);
170 if ((flags >> 13) == 0) {
171 /* Entry is a Slave secondary, success...*/
175 pos = pci_read_config8(dev, pos + PCI_CAP_LIST_NEXT);
180 static void ht_collapse_early_enumeration(struct bus *bus)
184 /* Spin through the devices and collapse any early
185 * hypertransport enumeration.
187 for(devfn = PCI_DEVFN(1, 0); devfn <= 0xff; devfn += 8) {
192 dummy.path.type = DEVICE_PATH_PCI;
193 dummy.path.u.pci.devfn = devfn;
194 id = pci_read_config32(&dummy, PCI_VENDOR_ID);
195 if (id == 0xffffffff || id == 0x00000000 ||
196 id == 0x0000ffff || id == 0xffff0000) {
200 dummy.vendor = id & 0xffff;
201 dummy.device = (id >> 16) & 0xffff;
202 dummy.hdr_type = pci_read_config8(&dummy, PCI_HEADER_TYPE);
203 pos = ht_lookup_slave_capability(&dummy);
208 /* Clear the unitid */
209 flags = pci_read_config16(&dummy, pos + PCI_CAP_FLAGS);
211 pci_write_config16(&dummy, pos + PCI_CAP_FLAGS, flags);
212 printk_spew("Collapsing %s [%04x/%04x]\n",
213 dev_path(&dummy), dummy.vendor, dummy.device);
217 unsigned int hypertransport_scan_chain(struct bus *bus, unsigned int max)
219 unsigned next_unitid, last_unitid, previous_unitid;
220 uint8_t previous_pos;
221 device_t old_devices, dev, func, *chain_last;
222 unsigned min_unitid = 1;
224 struct prev_link prev;
226 /* Restore the hypertransport chain to it's unitialized state */
227 ht_collapse_early_enumeration(bus);
229 /* See which static device nodes I have */
230 old_devices = bus->children;
232 chain_last = &bus->children;
234 /* Initialize the hypertransport enumeration state */
238 prev.config_off = PCI_HT_CAP_HOST_WIDTH;
239 prev.freq_off = PCI_HT_CAP_HOST_FREQ;
240 prev.freq_cap_off = PCI_HT_CAP_HOST_FREQ_CAP;
242 /* If present assign unitid to a hypertransport chain */
243 last_unitid = min_unitid -1;
244 next_unitid = min_unitid;
248 uint8_t hdr_type, pos;
250 unsigned count, static_count;
252 previous_unitid = last_unitid;
253 last_unitid = next_unitid;
255 /* Get setup the device_structure */
256 dev = ht_scan_get_devs(&old_devices);
261 dummy.path.type = DEVICE_PATH_PCI;
262 dummy.path.u.pci.devfn = 0;
263 id = pci_read_config32(&dummy, PCI_VENDOR_ID);
264 /* If the chain is fully enumerated quit */
265 if (id == 0xffffffff || id == 0x00000000 ||
266 id == 0x0000ffff || id == 0xffff0000) {
269 dev = alloc_dev(bus, &dummy.path);
272 /* Add this device to the pci bus chain */
274 /* Run the magice enable sequence for the device */
275 if (dev->chip_ops && dev->chip_ops->enable_dev) {
276 dev->chip_ops->enable_dev(dev);
278 /* Now read the vendor and device id */
279 id = pci_read_config32(dev, PCI_VENDOR_ID);
281 /* If the chain is fully enumerated quit */
282 if (id == 0xffffffff || id == 0x00000000 ||
283 id == 0x0000ffff || id == 0xffff0000) {
285 printk_info("Disabling static device: %s\n",
292 /* Update the device chain tail */
293 for(func = dev; func; func = func->sibling) {
294 chain_last = &func->sibling;
297 /* Read the rest of the pci configuration information */
298 hdr_type = pci_read_config8(dev, PCI_HEADER_TYPE);
299 class = pci_read_config32(dev, PCI_CLASS_REVISION);
301 /* Store the interesting information in the device structure */
302 dev->vendor = id & 0xffff;
303 dev->device = (id >> 16) & 0xffff;
304 dev->hdr_type = hdr_type;
305 /* class code, the upper 3 bytes of PCI_CLASS_REVISION */
306 dev->class = class >> 8;
308 /* Find the hypertransport link capability */
309 pos = ht_lookup_slave_capability(dev);
311 printk_err("%s Hypertransport link capability not found",
317 /* Update the Unitid of the current device */
318 flags = pci_read_config16(dev, pos + PCI_CAP_FLAGS);
319 flags &= ~0x1f; /* mask out base Unit ID */
320 flags |= next_unitid & 0x1f;
321 pci_write_config16(dev, pos + PCI_CAP_FLAGS, flags);
323 /* Update the Unitd id in the device structure */
325 for(func = dev; func; func = func->sibling) {
326 func->path.u.pci.devfn += (next_unitid << 3);
327 static_count = (func->path.u.pci.devfn >> 3)
328 - (dev->path.u.pci.devfn >> 3) + 1;
331 /* Compute the number of unitids consumed */
332 count = (flags >> 5) & 0x1f; /* get unit count */
333 printk_spew("%s count: %04x static_count: %04x\n",
334 dev_path(dev), count, static_count);
335 if (count < static_count) {
336 count = static_count;
339 /* Update the Unitid of the next device */
340 next_unitid += count;
342 /* Setup the hypetransport link */
343 reset_needed |= ht_setup_link(&prev, dev, pos);
345 printk_debug("%s [%04x/%04x] %s next_unitid: %04x\n",
347 dev->vendor, dev->device,
348 (dev->enabled? "enabled": "disabled"), next_unitid);
350 } while((last_unitid != next_unitid) && (next_unitid <= 0x1f));
351 #if HAVE_HARD_RESET == 1
353 printk_info("HyperT reset needed\n");
357 printk_debug("HyperT reset not needed\n");
360 if (next_unitid > 0x1f) {
363 return pci_scan_bus(bus, 0x00, (next_unitid << 3)|7, max);