| /* |
| * This file is part of the LinuxBIOS project. |
| * |
| * Copyright (C) 2003-2004 Linux Networx |
| * (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx) |
| * Copyright (C) 2004 David Hendricks <sc@flagen.com> |
| * Copyright (C) 2004 Li-Ta Lo <ollie@lanl.gov> |
| * Copyright (C) 2005-2006 Tyan |
| * (Written by Yinghai Lu <yhlu@tyan.com> for Tyan) |
| * Copyright (C) 2005-2006 Stefan Reinauer <stepan@openbios.org> |
| * |
| * 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 |
| */ |
| |
| /* |
| 2005.11 yhlu add let the real sb to use small uintid |
| */ |
| |
| #include <bitops.h> |
| #include <console/console.h> |
| #include <device/device.h> |
| #include <device/path.h> |
| #include <device/pci.h> |
| #include <device/pci_ids.h> |
| #include <device/hypertransport.h> |
| #include <part/hard_reset.h> |
| #include <part/fallback_boot.h> |
| |
| #define OPT_HT_LINK 0 |
| |
| #if OPT_HT_LINK == 1 |
| #include <cpu/amd/model_fxx_rev.h> |
| #endif |
| |
| static device_t ht_scan_get_devs(device_t *old_devices) |
| { |
| device_t 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.u.pci.devfn > last->path.u.pci.devfn)) |
| { |
| last = last->sibling; |
| } |
| if (first) { |
| device_t 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(device_t 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)) { |
| #if K8_HT_FREQ_1G_SUPPORT == 1 |
| #if K8_REV_F_SUPPORT == 0 |
| if (is_cpu_pre_e0()) { // only e0 later suupport 1GHz HT |
| freq_cap &= ~(1 << HT_FREQ_1000Mhz); |
| } |
| #endif |
| #else |
| freq_cap &= ~(1 << HT_FREQ_1000Mhz); |
| #endif |
| |
| } |
| return freq_cap; |
| } |
| #endif |
| |
| struct ht_link { |
| struct device *dev; |
| unsigned pos; |
| unsigned char ctrl_off, config_off, freq_off, freq_cap_off; |
| }; |
| |
| static int ht_setup_link(struct ht_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 }; |
| struct ht_link cur[1]; |
| 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; |
| int linkb_to_host; |
| |
| /* 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 new_freq; |
| pci_write_config8(cur->dev, cur->pos + cur->freq_off, freq); |
| reset_needed = 1; |
| printk_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_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 new_width; |
| pci_write_config8(cur->dev, cur->pos + cur->config_off + 1, |
| present_width); |
| reset_needed = 1; |
| printk_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_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 new_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); |
| new_freq = pci_read_config8(prev->dev, prev->pos + prev->freq_off); |
| new_freq &= 0x0f; |
| if (new_freq != freq) { |
| printk_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 new_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); |
| new_width = pci_read_config8(prev->dev, prev->pos + prev->config_off + 1); |
| if (new_width != upstream_width) { |
| printk_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 ht_lookup_slave_capability(struct device *dev) |
| { |
| unsigned pos; |
| pos = 0; |
| do { |
| pos = pci_find_next_capability(dev, PCI_CAP_ID_HT, pos); |
| if (pos) { |
| unsigned flags; |
| flags = pci_read_config16(dev, pos + PCI_CAP_FLAGS); |
| printk_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, unsigned offset_unitid) |
| { |
| unsigned int devfn; |
| struct ht_link prev; |
| unsigned ctrl; |
| |
| /* Initialize the hypertransport enumeration state */ |
| prev.dev = bus->dev; |
| prev.pos = bus->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_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; |
| uint32_t id; |
| dummy.bus = bus; |
| dummy.path.type = DEVICE_PATH_PCI; |
| dummy.path.u.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; |
| 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 min_devfn, unsigned max_devfn, unsigned int max, unsigned *ht_unitid_base, unsigned 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 next_unitid, last_unitid; |
| device_t old_devices, dev, func; |
| unsigned min_unitid = (offset_unitid) ? HT_CHAIN_UNITID_BASE:1; |
| struct ht_link prev; |
| device_t last_func = 0; |
| int ht_dev_num = 0; |
| unsigned temp_unitid; |
| unsigned not_use_count; |
| |
| #if HT_CHAIN_END_UNITID_BASE < HT_CHAIN_UNITID_BASE |
| //let't record the device of last ht device, So we can set the Unitid to HT_CHAIN_END_UNITID_BASE |
| unsigned real_last_unitid; |
| uint8_t real_last_pos; |
| device_t real_last_dev; |
| #endif |
| |
| /* Restore the hypertransport chain to it's unitialized state */ |
| ht_collapse_early_enumeration(bus, offset_unitid); |
| |
| /* See which static device nodes I have */ |
| old_devices = bus->children; |
| bus->children = 0; |
| |
| /* Initialize the hypertransport enumeration state */ |
| prev.dev = bus->dev; |
| prev.pos = bus->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 { |
| uint8_t pos; |
| uint16_t flags; |
| unsigned count, static_count; |
| unsigned 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_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_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 */ |
| |
| count = (flags >> 5) & 0x1f; /* get unit count */ |
| not_use_count = 0; |
| temp_unitid = next_unitid; |
| #if HT_CHAIN_END_UNITID_BASE < HT_CHAIN_UNITID_BASE |
| if(offset_unitid) { |
| if((next_unitid+count)>=0x20) { |
| temp_unitid = HT_CHAIN_END_UNITID_BASE; |
| //still use the old next_unitid |
| not_use_count = 1; |
| } |
| |
| } |
| #endif |
| |
| flags |= temp_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 += (temp_unitid << 3); |
| static_count = (func->path.u.pci.devfn >> 3) |
| - (dev->path.u.pci.devfn >> 3) + 1; |
| last_func = func; |
| } |
| /* Compute the number of unitids consumed */ |
| printk_spew("%s count: %04x static_count: %04x\n", |
| dev_path(dev), count, static_count); |
| if (count < static_count) { |
| count = static_count; |
| } |
| if(!not_use_count) |
| next_unitid += count; |
| |
| /* Update the Unitid of the next device */ |
| ht_unitid_base[ht_dev_num] = temp_unitid; |
| ht_dev_num++; |
| |
| #if HT_CHAIN_END_UNITID_BASE < HT_CHAIN_UNITID_BASE |
| if(offset_unitid) { |
| real_last_pos = pos; |
| real_last_unitid = temp_unitid; |
| real_last_dev = dev; |
| } |
| #endif |
| |
| /* Setup the hypetransport link */ |
| bus->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->enabled? "enabled": "disabled"), next_unitid); |
| |
| } while((last_unitid != next_unitid) && (next_unitid <= 0x1f /*(max_devfn >> 3)*/ )); |
| end_of_chain: |
| #if OPT_HT_LINK == 1 |
| if(bus->reset_needed) { |
| printk_info("HyperT reset needed\n"); |
| } |
| else { |
| printk_debug("HyperT reset not needed\n"); |
| } |
| #endif |
| |
| #if HT_CHAIN_END_UNITID_BASE < HT_CHAIN_UNITID_BASE |
| if(offset_unitid && (ht_dev_num>1) && (real_last_unitid != HT_CHAIN_END_UNITID_BASE) ) { |
| uint16_t flags; |
| int i; |
| device_t 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.u.pci.devfn -= ((real_last_unitid - HT_CHAIN_END_UNITID_BASE) << 3); |
| last_func = func; |
| } |
| |
| ht_unitid_base[ht_dev_num-1] = HT_CHAIN_END_UNITID_BASE; // update last one |
| |
| next_unitid = real_last_unitid; |
| } |
| #endif |
| |
| if (next_unitid > 0x1f) { |
| next_unitid = 0x1f; |
| } |
| if( (bus->secondary == 0) && (next_unitid > 0x17)) { |
| next_unitid = 0x17; /* avoid K8 on bus 0 */ |
| } |
| |
| /* Die if any leftover Static devices are are found. |
| * There's probably a problem in the Config.lb. |
| */ |
| if(old_devices) { |
| device_t left; |
| for(left = old_devices; left; left = left->sibling) { |
| printk_debug("%s\n", dev_path(left)); |
| } |
| printk_err("HT: Left over static devices. Check your Config.lb\n"); |
| if(last_func && !last_func->sibling) // put back the left over static device, and let pci_scan_bus disable it |
| 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-1) << 3)|7, max); |
| return max; |
| } |
| |
| /** |
| * @brief 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. |
| * |
| * @param dev pointer to the bridge device |
| * @param max the highest bus number assgined up to now |
| * |
| * @return The maximum bus number found, after scanning all subordinate busses |
| */ |
| unsigned int hypertransport_scan_chain_x(struct bus *bus, |
| unsigned min_devfn, unsigned max_devfn, unsigned int max) |
| { |
| unsigned ht_unitid_base[4]; |
| unsigned offset_unitid = 1; |
| return hypertransport_scan_chain(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 struct pci_operations ht_bus_ops_pci = { |
| .set_subsystem = 0, |
| }; |
| |
| struct device_operations default_ht_ops_bus = { |
| .read_resources = pci_bus_read_resources, |
| .set_resources = pci_dev_set_resources, |
| .enable_resources = pci_bus_enable_resources, |
| .init = 0, |
| .scan_bus = ht_scan_bridge, |
| .enable = 0, |
| .reset_bus = pci_bus_reset, |
| .ops_pci = &ht_bus_ops_pci, |
| }; |