/* * This file is part of the coreboot project. * * Copyright (C) 2003-2004 Linux Networx * (Written by Eric Biederman for Linux Networx) * Copyright (C) 2004 David Hendricks * Copyright (C) 2004 Li-Ta Lo * Copyright (C) 2005-2006 Tyan * (Written by Yinghai Lu for Tyan) * Copyright (C) 2005-2006 Stefan Reinauer * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define OPT_HT_LINK 0 static struct device *ht_scan_get_devs(struct device **old_devices) { struct device *first, *last; first = *old_devices; last = first; /* Extract the chain of devices to (first through last) * for the next hypertransport device. */ while (last && last->sibling && (last->sibling->path.type == DEVICE_PATH_PCI) && (last->sibling->path.pci.devfn > last->path.pci.devfn)) { last = last->sibling; } if (first) { struct device *child; /* Unlink the chain from the list of old devices. */ *old_devices = last->sibling; last->sibling = 0; /* Now add the device to the list of devices on the bus. */ /* Find the last child of our parent. */ for (child = first->bus->children; child && child->sibling;) { child = child->sibling; } /* Place the chain on the list of children of their parent. */ if (child) { child->sibling = first; } else { first->bus->children = first; } } return first; } #if OPT_HT_LINK == 1 static unsigned ht_read_freq_cap(struct device *dev, unsigned pos) { /* Handle bugs in valid hypertransport frequency reporting. */ unsigned freq_cap; freq_cap = pci_read_config16(dev, pos); freq_cap &= ~(1 << HT_FREQ_VENDOR); /* Ignore vendor HT frequencies. */ /* AMD 8131 Errata 48. */ if ((dev->vendor == PCI_VENDOR_ID_AMD) && (dev->device == PCI_DEVICE_ID_AMD_8131_PCIX)) { freq_cap &= ~(1 << HT_FREQ_800Mhz); } /* AMD 8151 Errata 23. */ if ((dev->vendor == PCI_VENDOR_ID_AMD) && (dev->device == PCI_DEVICE_ID_AMD_8151_SYSCTRL)) { freq_cap &= ~(1 << HT_FREQ_800Mhz); } /* AMD K8 unsupported 1GHz? */ if ((dev->vendor == PCI_VENDOR_ID_AMD) && (dev->device == 0x1100)) { #ifndef K8_HT_FREQ_1G_SUPPORT freq_cap &= ~(1 << HT_FREQ_1000Mhz); #endif } return freq_cap; } #endif struct ht_link { struct device *dev; unsigned int pos; unsigned char ctrl_off, config_off, freq_off, freq_cap_off; }; static int ht_setup_link(struct ht_link *prev, struct device *dev, unsigned int pos) { struct ht_link cur[1]; int reset_needed; int linkb_to_host; #if OPT_HT_LINK == 1 unsigned int present_width_cap, upstream_width_cap; unsigned int present_freq_cap, upstream_freq_cap; static const u8 link_width_to_pow2[] = { 3, 4, 0, 5, 1, 2, 0, 0 }; static const u8 pow2_to_link_width[] = { 0x7, 4, 5, 0, 1, 3 }; unsigned int ln_present_width_in, ln_upstream_width_in; unsigned int ln_present_width_out, ln_upstream_width_out; unsigned int freq, old_freq; unsigned int present_width, upstream_width, old_width; #endif /* Set the hypertransport link width and frequency. */ reset_needed = 0; /* See which side of the device our previous write to * set the unitid came from. */ cur->dev = dev; cur->pos = pos; linkb_to_host = (pci_read_config16(cur->dev, cur->pos + PCI_CAP_FLAGS) >> 10) & 1; if (!linkb_to_host) { cur->ctrl_off = PCI_HT_CAP_SLAVE_CTRL0; cur->config_off = PCI_HT_CAP_SLAVE_WIDTH0; cur->freq_off = PCI_HT_CAP_SLAVE_FREQ0; cur->freq_cap_off = PCI_HT_CAP_SLAVE_FREQ_CAP0; } else { cur->ctrl_off = PCI_HT_CAP_SLAVE_CTRL1; cur->config_off = PCI_HT_CAP_SLAVE_WIDTH1; cur->freq_off = PCI_HT_CAP_SLAVE_FREQ1; cur->freq_cap_off = PCI_HT_CAP_SLAVE_FREQ_CAP1; } #if OPT_HT_LINK == 1 /* Read the capabilities. */ present_freq_cap = ht_read_freq_cap(cur->dev, cur->pos + cur->freq_cap_off); upstream_freq_cap = ht_read_freq_cap(prev->dev, prev->pos + prev->freq_cap_off); present_width_cap = pci_read_config8(cur->dev, cur->pos + cur->config_off); upstream_width_cap = pci_read_config8(prev->dev, prev->pos + prev->config_off); /* Calculate the highest useable frequency. */ freq = log2(present_freq_cap & upstream_freq_cap); /* 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(cur->dev, cur->pos + cur->freq_off); old_freq &= 0x0f; if (freq != old_freq) { unsigned int new_freq; pci_write_config8(cur->dev, cur->pos + cur->freq_off, freq); reset_needed = 1; printk(BIOS_SPEW, "HyperT FreqP old %x new %x\n", old_freq, freq); new_freq = pci_read_config8(cur->dev, cur->pos + cur->freq_off); new_freq &= 0x0f; if (new_freq != freq) { printk(BIOS_ERR, "%s Hypertransport frequency would not set wanted: %x got: %x\n", dev_path(dev), freq, new_freq); } } old_width = pci_read_config8(cur->dev, cur->pos + cur->config_off + 1); if (present_width != old_width) { unsigned int new_width; pci_write_config8(cur->dev, cur->pos + cur->config_off + 1, present_width); reset_needed = 1; printk(BIOS_SPEW, "HyperT widthP old %x new %x\n", old_width, present_width); new_width = pci_read_config8(cur->dev, cur->pos + cur->config_off + 1); if (new_width != present_width) { printk(BIOS_ERR, "%s Hypertransport width would not set wanted: %x got: %x\n", dev_path(dev), present_width, new_width); } } /* Set the upstream device. */ old_freq = pci_read_config8(prev->dev, prev->pos + prev->freq_off); old_freq &= 0x0f; if (freq != old_freq) { unsigned int new_freq; pci_write_config8(prev->dev, prev->pos + prev->freq_off, freq); reset_needed = 1; printk(BIOS_SPEW, "HyperT freqU old %x new %x\n", old_freq, freq); new_freq = pci_read_config8(prev->dev, prev->pos + prev->freq_off); new_freq &= 0x0f; if (new_freq != freq) { printk(BIOS_ERR, "%s Hypertransport frequency would not set wanted: %x got: %x\n", dev_path(prev->dev), freq, new_freq); } } old_width = pci_read_config8(prev->dev, prev->pos + prev->config_off + 1); if (upstream_width != old_width) { unsigned int new_width; pci_write_config8(prev->dev, prev->pos + prev->config_off + 1, upstream_width); reset_needed = 1; printk(BIOS_SPEW, "HyperT widthU old %x new %x\n", old_width, upstream_width); new_width = pci_read_config8(prev->dev, prev->pos + prev->config_off + 1); if (new_width != upstream_width) { printk(BIOS_ERR, "%s Hypertransport width would not set wanted: %x got: %x\n", dev_path(prev->dev), upstream_width, new_width); } } #endif /* Remember the current link as the previous link, * but look at the other offsets. */ prev->dev = cur->dev; prev->pos = cur->pos; if (cur->ctrl_off == PCI_HT_CAP_SLAVE_CTRL0) { prev->ctrl_off = PCI_HT_CAP_SLAVE_CTRL1; 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; } else { prev->ctrl_off = PCI_HT_CAP_SLAVE_CTRL0; prev->config_off = PCI_HT_CAP_SLAVE_WIDTH0; prev->freq_off = PCI_HT_CAP_SLAVE_FREQ0; prev->freq_cap_off = PCI_HT_CAP_SLAVE_FREQ_CAP0; } return reset_needed; } static unsigned int ht_lookup_slave_capability(struct device *dev) { unsigned int pos; pos = 0; do { pos = pci_find_next_capability(dev, PCI_CAP_ID_HT, pos); if (pos) { unsigned int flags; flags = pci_read_config16(dev, pos + PCI_CAP_FLAGS); printk(BIOS_SPEW, "Flags: 0x%04x\n", flags); if ((flags >> 13) == 0) { /* Entry is a Slave secondary, success... */ break; } } } while (pos); return pos; } static void ht_collapse_early_enumeration(struct bus *bus, struct device* htdev, unsigned int offset_unitid) { unsigned int devfn, ctrl; struct ht_link prev; /* Initialize the hypertransport enumeration state. */ prev.dev = htdev; prev.pos = htdev->link[0].cap; prev.ctrl_off = PCI_HT_CAP_HOST_CTRL; 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; /* Wait until the link initialization is complete. */ do { ctrl = pci_read_config16(prev.dev, prev.pos + prev.ctrl_off); /* Is this the end of the hypertransport chain? */ if (ctrl & (1 << 6)) { return; } /* Has the link failed? */ if (ctrl & (1 << 4)) { /* Either the link has failed, or we have a CRC error. * Sometimes this can happen due to link retrain, so * lets knock it down and see if its transient. */ ctrl |= ((1 << 4) | (1 << 8)); // Link fail + CRC. pci_write_config16(prev.dev, prev.pos + prev.ctrl_off, ctrl); ctrl = pci_read_config16(prev.dev, prev.pos + prev.ctrl_off); if (ctrl & ((1 << 4) | (1 << 8))) { printk(BIOS_ALERT, "Detected error on Hypertransport Link\n"); return; } } } while ((ctrl & (1 << 5)) == 0); /* Actually, only for one HT device HT chain, and unitid is 0. */ #if HT_CHAIN_UNITID_BASE == 0 if (offset_unitid) { return; } #endif /* Check if is already collapsed. */ if ((!offset_unitid) || (offset_unitid && (!((HT_CHAIN_END_UNITID_BASE == 0) && (HT_CHAIN_END_UNITID_BASE < HT_CHAIN_UNITID_BASE))))) { struct device dummy; u32 id; dummy.bus = bus; dummy.path.type = DEVICE_PATH_PCI; dummy.path.pci.devfn = PCI_DEVFN(0, 0); id = pci_read_config32(&dummy, PCI_VENDOR_ID); if (!((id == 0xffffffff) || (id == 0x00000000) || (id == 0x0000ffff) || (id == 0xffff0000))) { return; } } /* Spin through the devices and collapse any early * hypertransport enumeration. */ for (devfn = PCI_DEVFN(1, 0); devfn <= 0xff; devfn += 8) { struct device dummy; u32 id; unsigned int pos, flags; dummy.bus = bus; dummy.path.type = DEVICE_PATH_PCI; dummy.path.pci.devfn = devfn; id = pci_read_config32(&dummy, PCI_VENDOR_ID); if ((id == 0xffffffff) || (id == 0x00000000) || (id == 0x0000ffff) || (id == 0xffff0000)) { continue; } dummy.id.type = DEVICE_ID_PCI; dummy.id.pci.vendor = id & 0xffff; dummy.id.pci.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(BIOS_SPEW, "Collapsing %s [%04x/%04x]\n", dev_path(&dummy), dummy.id.pci.vendor, dummy.id.pci.device); } } unsigned int hypertransport_scan_chain(struct device* htdev, struct bus *bus, unsigned int min_devfn, unsigned int max_devfn, unsigned int max, unsigned int *ht_unitid_base, unsigned int offset_unitid) { /* Even HT_CHAIN_UNITID_BASE == 0, we still can go through this * function, because of end_of_chain check, also we need it to * optimize link. */ unsigned int next_unitid, last_unitid; struct device *old_devices, *dev, *func; unsigned int min_unitid = (offset_unitid) ? HT_CHAIN_UNITID_BASE : 1; struct ht_link prev; struct device *last_func = 0; int ht_dev_num = 0; #if HT_CHAIN_END_UNITID_BASE < HT_CHAIN_UNITID_BASE /* Let's record the device of last HT device, so we can set the * unitid to HT_CHAIN_END_UNITID_BASE. */ unsigned int real_last_unitid = 0; u8 real_last_pos = 0; struct device *real_last_dev = NULL; #endif /* Restore the hypertransport chain to its unitialized state. */ ht_collapse_early_enumeration(bus, htdev, offset_unitid); /* See which static device nodes I have. */ old_devices = bus->children; bus->children = NULL; /* Initialize the hypertransport enumeration state. */ prev.dev = htdev; prev.pos = htdev->link[0].cap; prev.ctrl_off = PCI_HT_CAP_HOST_CTRL; 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; do { u8 pos; u16 flags; unsigned int count, static_count, ctrl; last_unitid = next_unitid; /* Wait until the link initialization is complete. */ do { ctrl = pci_read_config16(prev.dev, prev.pos + prev.ctrl_off); if (ctrl & (1 << 6)) goto end_of_chain; // End of chain. if (ctrl & ((1 << 4) | (1 << 8))) { /* Either the link has failed, or we have a * CRC error. Sometimes this can happen due to * link retrain, so lets knock it down and see * if its transient. */ ctrl |= ((1 << 4) | (1 << 8)); /* Link fail + CRC */ pci_write_config16(prev.dev, prev.pos + prev.ctrl_off, ctrl); ctrl = pci_read_config16(prev.dev, prev.pos + prev.ctrl_off); if (ctrl & ((1 << 4) | (1 << 8))) { printk(BIOS_ALERT, "Detected error on Hypertransport Link\n"); goto end_of_chain; } } } while ((ctrl & (1 << 5)) == 0); /* Get and setup the device_structure. */ dev = ht_scan_get_devs(&old_devices); /* See if a device is present and setup the device structure. */ dev = pci_probe_dev(dev, bus, 0); if (!dev || !dev->enabled) { break; } /* Find the hypertransport link capability. */ pos = ht_lookup_slave_capability(dev); if (pos == 0) { printk(BIOS_ERR, "%s Hypertransport link capability not found", dev_path(dev)); break; } /* Update the unitid of the current device. */ flags = pci_read_config16(dev, pos + PCI_CAP_FLAGS); /* If the devices has a unitid set and is at devfn 0 we are * done. This can happen with shadow hypertransport devices, * or if we have reached the bottom of a hypertransport * device chain. */ if (flags & 0x1f) { break; } flags &= ~0x1f; /* Mask out base Unit ID. */ flags |= next_unitid & 0x1f; pci_write_config16(dev, pos + PCI_CAP_FLAGS, flags); /* Update the unitid in the device structure. */ static_count = 1; for (func = dev; func; func = func->sibling) { func->path.pci.devfn += (next_unitid << 3); static_count = (func->path.pci.devfn >> 3) - (dev->path.pci.devfn >> 3) + 1; last_func = func; } /* Compute the number of unitids consumed. */ count = (flags >> 5) & 0x1f; /* Get unit count. */ printk(BIOS_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. */ ht_unitid_base[ht_dev_num] = next_unitid; ht_dev_num++; #if HT_CHAIN_END_UNITID_BASE < HT_CHAIN_UNITID_BASE if (offset_unitid) { real_last_unitid = next_unitid; real_last_pos = pos; real_last_dev = dev; } #endif next_unitid += count; /* Setup the hypertransport link. */ htdev->link[0].reset_needed |= ht_setup_link(&prev, dev, pos); printk(BIOS_DEBUG, "%s [%04x/%04x] %s next_unitid: %04x\n", dev_path(dev), dev->id.pci.vendor, dev->id.pci.device, (dev->enabled ? "enabled" : "disabled"), next_unitid); } while ((last_unitid != next_unitid) && (next_unitid <= (max_devfn >> 3))); end_of_chain: #if OPT_HT_LINK == 1 if (htdev->link[0].reset_needed) { printk(BIOS_INFO, "HyperT reset needed\n"); } else { printk(BIOS_DEBUG, "HyperT reset not needed\n"); } #endif #if HT_CHAIN_END_UNITID_BASE < HT_CHAIN_UNITID_BASE if (offset_unitid && (ht_dev_num > 0)) { u16 flags; struct device *last_func = 0; flags = pci_read_config16(real_last_dev, real_last_pos + PCI_CAP_FLAGS); flags &= ~0x1f; flags |= HT_CHAIN_END_UNITID_BASE & 0x1f; pci_write_config16(real_last_dev, real_last_pos + PCI_CAP_FLAGS, flags); for (func = real_last_dev; func; func = func->sibling) { func->path.pci.devfn -= ((real_last_unitid - HT_CHAIN_END_UNITID_BASE) << 3); last_func = func; } /* Update last one. */ ht_unitid_base[ht_dev_num - 1] = HT_CHAIN_END_UNITID_BASE; next_unitid = real_last_unitid; } #endif if (next_unitid > 0x1f) { next_unitid = 0x1f; } /* Die if any leftover static devices are found. * There's probably a problem in the Config.lb. * TODO: No more Config.lb in coreboot-v3. */ if (old_devices) { struct device *left; printk(BIOS_INFO, "HT: Left over static devices:\n"); for (left = old_devices; left; left = left->sibling) { printk(BIOS_INFO, "%s\n", dev_path(left)); } printk(BIOS_INFO, "HT: End of leftover list.\n"); /* Put back the left over static device, and let * pci_scan_bus() disable it. */ if (last_func && !last_func->sibling) last_func->sibling = old_devices; } /* Now that nothing is overlapping it is safe to scan the * children. */ max = pci_scan_bus(bus, 0x00, (next_unitid << 3) | 7, max); return max; } /** * Scan a PCI bridge and the buses behind the bridge. * * Determine the existence of buses behind the bridge. Set up the bridge * according to the result of the scan. * * This function is the default scan_bus() method for PCI bridge devices. * * TODO: This comment in copy+pasted from elsewhere and probably incorrect. * * @param bus TODO * @param min_devfn TODO * @param max_devfn TODO * @param max The highest bus number assigned up to now. * @return The maximum bus number found, after scanning all subordinate buses. */ unsigned int hypertransport_scan_chain_x(struct bus *bus, unsigned int min_devfn, unsigned int max_devfn, unsigned int max) { unsigned int ht_unitid_base[4]; unsigned int offset_unitid = 1; return hypertransport_scan_chain(bus->dev, bus, min_devfn, max_devfn, max, ht_unitid_base, offset_unitid); } unsigned int ht_scan_bridge(struct device *dev, unsigned int max) { return do_pci_scan_bridge(dev, max, hypertransport_scan_chain_x); } /** Default device operations for hypertransport bridges. */ static const struct pci_operations ht_bus_ops_pci = { .set_subsystem = 0, }; const struct device_operations default_ht_ops_bus = { .phase3_scan = ht_scan_bridge, .phase4_read_resources = pci_bus_read_resources, .phase4_set_resources = pci_set_resources, .phase5_enable_resources = pci_bus_enable_resources, .phase6_init = 0, .reset_bus = pci_bus_reset, .ops_pci = &ht_bus_ops_pci, };