device: Drop unused HyperTransport code

Only two definitions are actually used somewhere, the rest is unused.

Change-Id: Iec52d0d47fce6a1ec5455b670824b995a7a34a4c
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47407
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

4 files changed, 0 insertions, 526 deletions

diff --git a/src/device/Kconfig b/src/device/Kconfig
index d564f00b9c..a472a6abbb 100644
--- a/src/device/Kconfig
+++ b/src/device/Kconfig
@@ -491,18 +491,6 @@ config MMCONF_SUPPORT
 	bool
 	default !NO_MMCONF_SUPPORT
 
-config HYPERTRANSPORT_PLUGIN_SUPPORT
-	bool
-	default n
-
-config HT_CHAIN_UNITID_BASE
-	int
-	default 0
-
-config HT_CHAIN_END_UNITID_BASE
-	int
-	default 0
-
 config PCIX_PLUGIN_SUPPORT
 	bool
 	default y
diff --git a/src/device/Makefile.inc b/src/device/Makefile.inc
index 2fae44ab24..f5e2c685be 100644
--- a/src/device/Makefile.inc
+++ b/src/device/Makefile.inc
@@ -35,7 +35,6 @@ postcar-y += pci_ops.c
 ramstage-y += pci_ops.c
 smm-y += pci_ops.c
 
-ramstage-$(CONFIG_HYPERTRANSPORT_PLUGIN_SUPPORT) += hypertransport.c
 ramstage-$(CONFIG_PCIX_PLUGIN_SUPPORT) += pcix_device.c
 ramstage-$(CONFIG_PCIEXP_PLUGIN_SUPPORT) += pciexp_device.c
 ramstage-$(CONFIG_CARDBUS_PLUGIN_SUPPORT) += cardbus_device.c
diff --git a/src/device/hypertransport.c b/src/device/hypertransport.c
deleted file mode 100644
index 068c489b05..0000000000
--- a/src/device/hypertransport.c
+++ /dev/null
@@ -1,499 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-
-#include <console/console.h>
-#include <device/device.h>
-#include <device/path.h>
-#include <device/pci.h>
-#include <device/pci_ops.h>
-#include <device/pci_ids.h>
-#include <device/hypertransport.h>
-
-struct ht_link {
-	struct device *dev;
-	unsigned int pos;
-	unsigned char ctrl_off, config_off, freq_off, freq_cap_off;
-};
-
-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;
-}
-
-static int ht_setup_link(struct ht_link *prev, struct device *dev, unsigned int pos)
-{
-	struct ht_link cur[1];
-	int linkb_to_host;
-
-	/* Set the hypertransport link width and frequency. */
-
-	/*
-	 * 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;
-	}
-
-	/*
-	 * 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 0;
-}
-
-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) {
-			u16 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,
-					  unsigned int offset_unitid)
-{
-	unsigned int devfn;
-	struct ht_link prev;
-	u16 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(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 !CONFIG_HT_CHAIN_UNITID_BASE
-	if (offset_unitid)
-		return;
-#endif
-
-	/* Check if is already collapsed. */
-	if ((!offset_unitid) || (offset_unitid
-	    && (!((CONFIG_HT_CHAIN_END_UNITID_BASE == 0)
-	    && (CONFIG_HT_CHAIN_END_UNITID_BASE
-	    < CONFIG_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 HT 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.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(BIOS_SPEW, "Collapsing %s [%04x/%04x]\n",
-		       dev_path(&dummy), dummy.vendor, dummy.device);
-	}
-}
-
-static unsigned int do_hypertransport_scan_chain(struct bus *bus, unsigned int min_devfn,
-				       unsigned int max_devfn,
-				       unsigned int *ht_unitid_base,
-				       unsigned int offset_unitid)
-{
-	/*
-	 * Even CONFIG_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, min_unitid, max_unitid;
-	struct device *old_devices, *dev, *func, *last_func = NULL;
-	struct ht_link prev;
-	int ht_dev_num = 0;
-
-	printk(BIOS_SPEW, "%s for bus %02x\n", __func__, bus->secondary);
-
-	min_unitid = (offset_unitid) ? CONFIG_HT_CHAIN_UNITID_BASE : 1;
-
-#if CONFIG_HT_CHAIN_END_UNITID_BASE != 0x20
-	/*
-	 * Let's record the device of last HT device, so we can set the unitid
-	 * to CONFIG_HT_CHAIN_END_UNITID_BASE.
-	 */
-	unsigned int real_last_unitid = 0, end_used = 0;
-	u8 real_last_pos = 0;
-	struct device *real_last_dev = NULL;
-#endif
-
-	/* Restore the hypertransport chain to it's uninitialized 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. */
-	max_unitid = next_unitid = min_unitid;
-	do {
-		u8 pos;
-		u16 flags, ctrl;
-		unsigned int count, static_count;
-
-		last_unitid = next_unitid;
-
-		/* Wait until the link initialization is complete. */
-		do {
-			ctrl = pci_read_config16(prev.dev,
-						 prev.pos + prev.ctrl_off);
-
-			/* End of chain? */
-			if (ctrl & (1 << 6))
-				goto 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
-				 * it's 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 device 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 HT device chain.
-		 */
-		if (flags & 0x1f)
-			break;
-
-		flags &= ~0x1f; /* Mask out base Unit ID. */
-
-		count = (flags >> 5) & 0x1f; /* Het unit count. */
-
-#if CONFIG_HT_CHAIN_END_UNITID_BASE != 0x20
-		if (offset_unitid) {
-			/* max_devfn will be (0x17<<3)|7 or (0x1f<<3)|7. */
-			if (next_unitid > (max_devfn >> 3)) {
-				if (!end_used) {
-			                next_unitid =
-					  CONFIG_HT_CHAIN_END_UNITID_BASE;
-					end_used = 1;
-				} else {
-					goto end_of_chain;
-				}
-			}
-		}
-#endif
-
-		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. */
-		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 CONFIG_HT_CHAIN_END_UNITID_BASE != 0x20
-		if (offset_unitid) {
-			real_last_pos = pos;
-			real_last_unitid = next_unitid;
-			real_last_dev = dev;
-		}
-#endif
-		next_unitid += count;
-		if (next_unitid > max_unitid)
-			max_unitid = next_unitid;
-
-		/* Setup the hypertransport link. */
-		bus->reset_needed |= ht_setup_link(&prev, dev, pos);
-
-		printk(BIOS_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);
-
-end_of_chain:
-
-#if CONFIG_HT_CHAIN_END_UNITID_BASE != 0x20
-	if (offset_unitid && (ht_dev_num > 1)
-	    && (real_last_unitid != CONFIG_HT_CHAIN_END_UNITID_BASE)
-	    && !end_used) {
-		u16 flags;
-		flags = pci_read_config16(real_last_dev,
-					  real_last_pos + PCI_CAP_FLAGS);
-		flags &= ~0x1f;
-		flags |= CONFIG_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
-				- CONFIG_HT_CHAIN_END_UNITID_BASE) << 3);
-			last_func = func;
-		}
-
-		/* Update last one. */
-		ht_unitid_base[ht_dev_num-1] = CONFIG_HT_CHAIN_END_UNITID_BASE;
-
-		printk(BIOS_DEBUG, " unitid: %04x --> %04x\n",
-		       real_last_unitid, CONFIG_HT_CHAIN_END_UNITID_BASE);
-	}
-#endif
-	next_unitid = max_unitid;
-
-	if (next_unitid > 0x20)
-		next_unitid = 0x20;
-
-	if ((bus->secondary == 0) && (next_unitid > 0x18))
-		next_unitid = 0x18; /* Avoid K8 on bus 0. */
-
-	/*
-	 * Die if any leftover static devices are are found. There's probably
-	 * a problem in devicetree.cb.
-	 */
-	if (old_devices) {
-		struct device *left;
-		for (left = old_devices; left; left = left->sibling)
-			printk(BIOS_DEBUG, "%s\n", dev_path(left));
-
-		printk(BIOS_ERR, "HT: Leftover static devices. "
-		       "Check your devicetree.cb\n");
-
-		/*
-		 * Put back the leftover static device, and let pci_scan_bus()
-		 * disable it.
-		 */
-		if (last_func && !last_func->sibling)
-			last_func->sibling = old_devices;
-	}
-
-	return next_unitid;
-}
-
-/**
- * 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 bus TODO
- * @param min_devfn TODO
- * @param max_devfn TODO
- */
-static void hypertransport_scan_chain_x(struct bus *bus,
-	unsigned int min_devfn, unsigned int max_devfn)
-{
-	unsigned int ht_unitid_base[4];
-	unsigned int offset_unitid = 1;
-
-	unsigned int next_unitid = do_hypertransport_scan_chain(bus, min_devfn, max_devfn,
-					 ht_unitid_base, offset_unitid);
-
-	/* Now that nothing is overlapping it is safe to scan the children. */
-	pci_scan_bus(bus, 0x00, ((next_unitid - 1) << 3) | 7);
-}
-
-static void ht_scan_bridge(struct device *dev)
-{
-	do_pci_scan_bridge(dev, 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,
-	.scan_bus         = ht_scan_bridge,
-	.reset_bus        = pci_bus_reset,
-	.ops_pci          = &ht_bus_ops_pci,
-};
diff --git a/src/device/pci_device.c b/src/device/pci_device.c
index a00897736a..a7eb91d42d 100644
--- a/src/device/pci_device.c
+++ b/src/device/pci_device.c
@@ -19,7 +19,6 @@
 #include <device/pci_ids.h>
 #include <device/pcix.h>
 #include <device/pciexp.h>
-#include <device/hypertransport.h>
 #include <pc80/i8259.h>
 #include <security/vboot/vbnv.h>
 #include <timestamp.h>
@@ -862,19 +861,6 @@ static struct device_operations *get_pci_bridge_ops(struct device *dev)
 		return &default_pcix_ops_bus;
 	}
 #endif
-#if CONFIG(HYPERTRANSPORT_PLUGIN_SUPPORT)
-	unsigned int htpos = 0;
-	while ((htpos = pci_find_next_capability(dev, PCI_CAP_ID_HT, htpos))) {
-		u16 flags;
-		flags = pci_read_config16(dev, htpos + PCI_CAP_FLAGS);
-		if ((flags >> 13) == 1) {
-			/* Host or Secondary Interface */
-			printk(BIOS_DEBUG, "%s subordinate bus HT\n",
-			       dev_path(dev));
-			return &default_ht_ops_bus;
-		}
-	}
-#endif
 #if CONFIG(PCIEXP_PLUGIN_SUPPORT)
 	unsigned int pciexpos;
 	pciexpos = pci_find_capability(dev, PCI_CAP_ID_PCIE);