| #include <bitops.h> |
| #include <console/console.h> |
| #include <device/device.h> |
| #include <device/path.h> |
| #include <device/pci.h> |
| #include <part/hard_reset.h> |
| #include <part/fallback_boot.h> |
| |
| static device_t ht_scan_get_devs(device_t *old_devices) |
| { |
| device_t first, last; |
| first = *old_devices; |
| last = first; |
| while(last && last->sibling && |
| (last->sibling->path.u.pci.devfn > last->path.u.pci.devfn)) { |
| last = last->sibling; |
| } |
| if (first) { |
| *old_devices = last->sibling; |
| last->sibling = 0; |
| } |
| return first; |
| } |
| |
| |
| struct prev_link { |
| struct device *dev; |
| unsigned pos; |
| unsigned char config_off, freq_off, freq_cap_off; |
| }; |
| |
| static int ht_setup_link(struct prev_link *prev, device_t dev, unsigned pos) |
| { |
| static const uint8_t link_width_to_pow2[]= { 3, 4, 0, 5, 1, 2, 0, 0 }; |
| static const uint8_t pow2_to_link_width[] = { 0x7, 4, 5, 0, 1, 3 }; |
| unsigned present_width_cap, upstream_width_cap; |
| unsigned present_freq_cap, upstream_freq_cap; |
| unsigned ln_present_width_in, ln_upstream_width_in; |
| unsigned ln_present_width_out, ln_upstream_width_out; |
| unsigned freq, old_freq; |
| unsigned present_width, upstream_width, old_width; |
| int reset_needed; |
| |
| /* Set the hypertransport link width and frequency */ |
| reset_needed = 0; |
| |
| /* Read the capabilities */ |
| present_freq_cap = pci_read_config16(dev, pos + PCI_HT_CAP_SLAVE_FREQ_CAP0); |
| upstream_freq_cap = pci_read_config16(prev->dev, prev->pos + prev->freq_cap_off); |
| present_width_cap = pci_read_config8(dev, pos + PCI_HT_CAP_SLAVE_WIDTH0); |
| upstream_width_cap = pci_read_config8(prev->dev, prev->pos + prev->config_off); |
| |
| /* Calculate the highest useable frequency */ |
| #if 0 |
| freq = log2(present_freq_cap & upstream_freq_cap); |
| #else |
| /* Errata for 8131 - freq 5 has hardware problems don't support it */ |
| freq = log2(present_freq_cap & upstream_freq_cap & 0x1f); |
| #endif |
| |
| /* Calculate the highest width */ |
| ln_upstream_width_in = link_width_to_pow2[upstream_width_cap & 7]; |
| ln_present_width_out = link_width_to_pow2[(present_width_cap >> 4) & 7]; |
| if (ln_upstream_width_in > ln_present_width_out) { |
| ln_upstream_width_in = ln_present_width_out; |
| } |
| upstream_width = pow2_to_link_width[ln_upstream_width_in]; |
| present_width = pow2_to_link_width[ln_upstream_width_in] << 4; |
| |
| ln_upstream_width_out = link_width_to_pow2[(upstream_width_cap >> 4) & 7]; |
| ln_present_width_in = link_width_to_pow2[present_width_cap & 7]; |
| if (ln_upstream_width_out > ln_present_width_in) { |
| ln_upstream_width_out = ln_present_width_in; |
| } |
| upstream_width |= pow2_to_link_width[ln_upstream_width_out] << 4; |
| present_width |= pow2_to_link_width[ln_upstream_width_out]; |
| |
| /* Set the current device */ |
| old_freq = pci_read_config8(dev, pos + PCI_HT_CAP_SLAVE_FREQ0); |
| if (freq != old_freq) { |
| pci_write_config8(dev, pos + PCI_HT_CAP_SLAVE_FREQ0, freq); |
| reset_needed = 1; |
| printk_spew("HyperT FreqP old %x new %x\n",old_freq,freq); |
| } |
| old_width = pci_read_config8(dev, pos + PCI_HT_CAP_SLAVE_WIDTH0 + 1); |
| if (present_width != old_width) { |
| pci_write_config8(dev, pos + PCI_HT_CAP_SLAVE_WIDTH0 + 1, present_width); |
| reset_needed = 1; |
| printk_spew("HyperT widthP old %x new %x\n",old_width, present_width); |
| } |
| |
| /* Set the upstream device */ |
| old_freq = pci_read_config8(prev->dev, prev->pos + prev->freq_off); |
| old_freq &= 0x0f; |
| if (freq != old_freq) { |
| pci_write_config8(prev->dev, prev->pos + prev->freq_off, freq); |
| reset_needed = 1; |
| printk_spew("HyperT freqU old %x new %x\n", old_freq, freq); |
| } |
| old_width = pci_read_config8(prev->dev, prev->pos + prev->config_off + 1); |
| if (upstream_width != old_width) { |
| pci_write_config8(prev->dev, prev->pos + prev->config_off + 1, upstream_width); |
| reset_needed = 1; |
| printk_spew("HyperT widthU old %x new %x\n", old_width, upstream_width); |
| } |
| |
| /* Remember the current link as the previous link */ |
| prev->dev = dev; |
| prev->pos = pos; |
| prev->config_off = PCI_HT_CAP_SLAVE_WIDTH1; |
| prev->freq_off = PCI_HT_CAP_SLAVE_FREQ1; |
| prev->freq_cap_off = PCI_HT_CAP_SLAVE_FREQ_CAP1; |
| |
| return reset_needed; |
| |
| } |
| |
| static unsigned ht_lookup_slave_capability(struct device *dev) |
| { |
| unsigned pos; |
| pos = 0; |
| switch(dev->hdr_type & 0x7f) { |
| case PCI_HEADER_TYPE_NORMAL: |
| case PCI_HEADER_TYPE_BRIDGE: |
| pos = PCI_CAPABILITY_LIST; |
| break; |
| } |
| if (pos > PCI_CAP_LIST_NEXT) { |
| pos = pci_read_config8(dev, pos); |
| } |
| while(pos != 0) { /* loop through the linked list */ |
| uint8_t cap; |
| cap = pci_read_config8(dev, pos + PCI_CAP_LIST_ID); |
| printk_spew("Capability: 0x%02x @ 0x%02x\n", cap, pos); |
| if (cap == PCI_CAP_ID_HT) { |
| unsigned flags; |
| flags = pci_read_config16(dev, pos + PCI_CAP_FLAGS); |
| printk_spew("flags: 0x%04x\n", (unsigned)flags); |
| if ((flags >> 13) == 0) { |
| /* Entry is a Slave secondary, success...*/ |
| break; |
| } |
| } |
| if(pos) { |
| pos = pci_read_config8(dev, pos + PCI_CAP_LIST_NEXT); |
| } |
| } |
| return pos; |
| } |
| |
| static void ht_collapse_early_enumeration(struct bus *bus) |
| { |
| unsigned int devfn; |
| |
| /* Spin through the devices and collapse any early |
| * hypertransport enumeration. |
| */ |
| for(devfn = 0; devfn <= 0xff; devfn += 8) { |
| struct device dummy; |
| uint32_t id; |
| unsigned pos, flags; |
| dummy.bus = bus; |
| dummy.path.type = DEVICE_PATH_PCI; |
| dummy.path.u.pci.devfn = devfn; |
| id = pci_read_config32(&dummy, PCI_VENDOR_ID); |
| if (id == 0xffffffff || id == 0x00000000 || |
| id == 0x0000ffff || id == 0xffff0000) { |
| continue; |
| } |
| dummy.vendor = id & 0xffff; |
| dummy.device = (id >> 16) & 0xffff; |
| dummy.hdr_type = pci_read_config8(&dummy, PCI_HEADER_TYPE); |
| pos = ht_lookup_slave_capability(&dummy); |
| if (!pos){ |
| continue; |
| } |
| |
| /* Clear the unitid */ |
| flags = pci_read_config16(&dummy, pos + PCI_CAP_FLAGS); |
| flags &= ~0x1f; |
| pci_write_config16(&dummy, pos + PCI_CAP_FLAGS, flags); |
| printk_spew("Collapsing %s [%04x/%04x]\n", |
| dev_path(&dummy), dummy.vendor, dummy.device); |
| } |
| } |
| |
| unsigned int hypertransport_scan_chain(struct bus *bus, unsigned int max) |
| { |
| unsigned next_unitid, last_unitid, previous_unitid; |
| uint8_t previous_pos; |
| device_t old_devices, dev, func, *chain_last; |
| unsigned min_unitid = 1; |
| int reset_needed; |
| struct prev_link prev; |
| |
| /* Restore the hypertransport chain to it's unitialized state */ |
| ht_collapse_early_enumeration(bus); |
| |
| /* See which static device nodes I have */ |
| old_devices = bus->children; |
| bus->children = 0; |
| chain_last = &bus->children; |
| |
| /* Initialize the hypertransport enumeration state */ |
| reset_needed = 0; |
| prev.dev = bus->dev; |
| prev.pos = bus->cap; |
| prev.config_off = PCI_HT_CAP_HOST_WIDTH; |
| prev.freq_off = PCI_HT_CAP_HOST_FREQ; |
| prev.freq_cap_off = PCI_HT_CAP_HOST_FREQ_CAP; |
| |
| /* If present assign unitid to a hypertransport chain */ |
| last_unitid = min_unitid -1; |
| next_unitid = min_unitid; |
| previous_pos = 0; |
| do { |
| uint32_t id, class; |
| uint8_t hdr_type, pos; |
| uint16_t flags; |
| unsigned count, static_count; |
| |
| previous_unitid = last_unitid; |
| last_unitid = next_unitid; |
| |
| /* Get setup the device_structure */ |
| dev = ht_scan_get_devs(&old_devices); |
| |
| if (!dev) { |
| struct device dummy; |
| dummy.bus = bus; |
| dummy.path.type = DEVICE_PATH_PCI; |
| dummy.path.u.pci.devfn = 0; |
| id = pci_read_config32(&dummy, PCI_VENDOR_ID); |
| /* If the chain is fully enumerated quit */ |
| if (id == 0xffffffff || id == 0x00000000 || |
| id == 0x0000ffff || id == 0xffff0000) { |
| break; |
| } |
| dev = alloc_dev(bus, &dummy.path); |
| } |
| else { |
| /* Add this device to the pci bus chain */ |
| *chain_last = dev; |
| /* Run the magice enable/disable sequence for the device */ |
| if (dev->ops && dev->ops->enable) { |
| dev->ops->enable(dev); |
| } |
| /* Now read the vendor and device id */ |
| id = pci_read_config32(dev, PCI_VENDOR_ID); |
| } |
| /* Update the device chain tail */ |
| for(func = dev; func; func = func->sibling) { |
| chain_last = &func->sibling; |
| } |
| |
| /* Read the rest of the pci configuration information */ |
| hdr_type = pci_read_config8(dev, PCI_HEADER_TYPE); |
| class = pci_read_config32(dev, PCI_CLASS_REVISION); |
| |
| /* Store the interesting information in the device structure */ |
| dev->vendor = id & 0xffff; |
| dev->device = (id >> 16) & 0xffff; |
| dev->hdr_type = hdr_type; |
| /* class code, the upper 3 bytes of PCI_CLASS_REVISION */ |
| dev->class = class >> 8; |
| |
| /* Find the hypertransport link capability */ |
| pos = ht_lookup_slave_capability(dev); |
| if (pos == 0) { |
| printk_err("Hypertransport link capability not found"); |
| break; |
| } |
| |
| /* Update the Unitid of the current device */ |
| flags = pci_read_config16(dev, pos + PCI_CAP_FLAGS); |
| flags &= ~0x1f; /* mask out base Unit ID */ |
| flags |= next_unitid & 0x1f; |
| pci_write_config16(dev, pos + PCI_CAP_FLAGS, flags); |
| |
| /* Update the Unitd id in the device structure */ |
| static_count = 1; |
| for(func = dev; func; func = func->sibling) { |
| func->path.u.pci.devfn += (next_unitid << 3); |
| static_count = (func->path.u.pci.devfn >> 3) |
| - (dev->path.u.pci.devfn >> 3) + 1; |
| } |
| |
| /* Compute the number of unitids consumed */ |
| count = (flags >> 5) & 0x1f; /* get unit count */ |
| printk_spew("%s count: %04x static_count: %04x\n", |
| dev_path(dev), count, static_count); |
| if (count < static_count) { |
| count = static_count; |
| } |
| |
| /* Update the Unitid of the next device */ |
| next_unitid += count; |
| |
| /* Setup the hypetransport link */ |
| reset_needed |= ht_setup_link(&prev, dev, pos); |
| |
| printk_debug("%s [%04x/%04x] %s next_unitid: %04x\n", |
| dev_path(dev), |
| dev->vendor, dev->device, |
| (dev->enable? "enabled": "disabled"), next_unitid); |
| |
| } while((last_unitid != next_unitid) && (next_unitid <= 0x1f)); |
| #if HAVE_HARD_RESET == 1 |
| if(reset_needed) { |
| printk_info("HyperT reset needed\n"); |
| hard_reset(); |
| } |
| printk_debug("HyperT reset not needed\n"); |
| #endif |
| if (next_unitid > 0x1f) { |
| next_unitid = 0x1f; |
| } |
| return pci_scan_bus(bus, 0x00, (next_unitid << 3)|7, max); |
| } |