diff options
Diffstat (limited to 'drivers/pci/hotplug/rpaphp_pci.c')
| -rw-r--r-- | drivers/pci/hotplug/rpaphp_pci.c | 538 |
1 files changed, 538 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/rpaphp_pci.c b/drivers/pci/hotplug/rpaphp_pci.c new file mode 100644 index 00000000000..d8305a935aa --- /dev/null +++ b/drivers/pci/hotplug/rpaphp_pci.c @@ -0,0 +1,538 @@ +/* + * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform. + * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com> + * + * All rights reserved. + * + * 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; either version 2 of the License, or (at + * your option) any later version. + * + * 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, GOOD TITLE or + * NON INFRINGEMENT. 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., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Send feedback to <lxie@us.ibm.com> + * + */ +#include <linux/pci.h> +#include <asm/pci-bridge.h> +#include <asm/rtas.h> +#include <asm/machdep.h> +#include "../pci.h" /* for pci_add_new_bus */ + +#include "rpaphp.h" + +struct pci_dev *rpaphp_find_pci_dev(struct device_node *dn) +{ + struct pci_dev *dev = NULL; + char bus_id[BUS_ID_SIZE]; + + sprintf(bus_id, "%04x:%02x:%02x.%d", dn->phb->global_number, + dn->busno, PCI_SLOT(dn->devfn), PCI_FUNC(dn->devfn)); + for_each_pci_dev(dev) { + if (!strcmp(pci_name(dev), bus_id)) { + break; + } + } + return dev; +} + +EXPORT_SYMBOL_GPL(rpaphp_find_pci_dev); + +int rpaphp_claim_resource(struct pci_dev *dev, int resource) +{ + struct resource *res = &dev->resource[resource]; + struct resource *root = pci_find_parent_resource(dev, res); + char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge"; + int err = -EINVAL; + + if (root != NULL) { + err = request_resource(root, res); + } + + if (err) { + err("PCI: %s region %d of %s %s [%lx:%lx]\n", + root ? "Address space collision on" : + "No parent found for", + resource, dtype, pci_name(dev), res->start, res->end); + } + return err; +} + +EXPORT_SYMBOL_GPL(rpaphp_claim_resource); + +static struct pci_dev *rpaphp_find_bridge_pdev(struct slot *slot) +{ + return rpaphp_find_pci_dev(slot->dn); +} + +static int rpaphp_get_sensor_state(struct slot *slot, int *state) +{ + int rc; + int setlevel; + + rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state); + + if (rc < 0) { + if (rc == -EFAULT || rc == -EEXIST) { + dbg("%s: slot must be power up to get sensor-state\n", + __FUNCTION__); + + /* some slots have to be powered up + * before get-sensor will succeed. + */ + rc = rtas_set_power_level(slot->power_domain, POWER_ON, + &setlevel); + if (rc < 0) { + dbg("%s: power on slot[%s] failed rc=%d.\n", + __FUNCTION__, slot->name, rc); + } else { + rc = rtas_get_sensor(DR_ENTITY_SENSE, + slot->index, state); + } + } else if (rc == -ENODEV) + info("%s: slot is unusable\n", __FUNCTION__); + else + err("%s failed to get sensor state\n", __FUNCTION__); + } + return rc; +} + +/** + * get_pci_adapter_status - get the status of a slot + * + * 0-- slot is empty + * 1-- adapter is configured + * 2-- adapter is not configured + * 3-- not valid + */ +int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value) +{ + int state, rc; + struct device_node *child_dn; + struct pci_dev *child_dev = NULL; + + *value = NOT_VALID; + rc = rpaphp_get_sensor_state(slot, &state); + if (rc) + goto exit; + + if ((state == EMPTY) || (slot->type == PHB)) { + dbg("slot is empty\n"); + *value = EMPTY; + } + else if (state == PRESENT) { + if (!is_init) { + /* at run-time slot->state can be changed by */ + /* config/unconfig adapter */ + *value = slot->state; + } else { + child_dn = slot->dn->child; + if (child_dn) + child_dev = rpaphp_find_pci_dev(child_dn); + + if (child_dev) + *value = CONFIGURED; + else if (!child_dn) + dbg("%s: %s is not valid OFDT node\n", + __FUNCTION__, slot->dn->full_name); + else { + err("%s: can't find pdev of adapter in slot[%s]\n", + __FUNCTION__, slot->dn->full_name); + *value = NOT_CONFIGURED; + } + } + } +exit: + return rc; +} + +/* Must be called before pci_bus_add_devices */ +static void +rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus) +{ + struct pci_dev *dev; + + list_for_each_entry(dev, &bus->devices, bus_list) { + /* + * Skip already-present devices (which are on the + * global device list.) + */ + if (list_empty(&dev->global_list)) { + int i; + + /* Need to setup IOMMU tables */ + ppc_md.iommu_dev_setup(dev); + + if(fix_bus) + pcibios_fixup_device_resources(dev, bus); + pci_read_irq_line(dev); + for (i = 0; i < PCI_NUM_RESOURCES; i++) { + struct resource *r = &dev->resource[i]; + + if (r->parent || !r->start || !r->flags) + continue; + rpaphp_claim_resource(dev, i); + } + } + } +} + +static int rpaphp_pci_config_bridge(struct pci_dev *dev); + +/***************************************************************************** + rpaphp_pci_config_slot() will configure all devices under the + given slot->dn and return the the first pci_dev. + *****************************************************************************/ +static struct pci_dev * +rpaphp_pci_config_slot(struct device_node *dn, struct pci_bus *bus) +{ + struct device_node *eads_first_child = dn->child; + struct pci_dev *dev = NULL; + int num; + + dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name); + + if (eads_first_child) { + /* pci_scan_slot should find all children of EADs */ + num = pci_scan_slot(bus, PCI_DEVFN(PCI_SLOT(eads_first_child->devfn), 0)); + if (num) { + rpaphp_fixup_new_pci_devices(bus, 1); + pci_bus_add_devices(bus); + } + dev = rpaphp_find_pci_dev(eads_first_child); + if (!dev) { + err("No new device found\n"); + return NULL; + } + if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) + rpaphp_pci_config_bridge(dev); + } + return dev; +} + +static int rpaphp_pci_config_bridge(struct pci_dev *dev) +{ + u8 sec_busno; + struct pci_bus *child_bus; + struct pci_dev *child_dev; + + dbg("Enter %s: BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev)); + + /* get busno of downstream bus */ + pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno); + + /* add to children of PCI bridge dev->bus */ + child_bus = pci_add_new_bus(dev->bus, dev, sec_busno); + if (!child_bus) { + err("%s: could not add second bus\n", __FUNCTION__); + return -EIO; + } + sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number); + /* do pci_scan_child_bus */ + pci_scan_child_bus(child_bus); + + list_for_each_entry(child_dev, &child_bus->devices, bus_list) { + eeh_add_device_late(child_dev); + } + + /* fixup new pci devices without touching bus struct */ + rpaphp_fixup_new_pci_devices(child_bus, 0); + + /* Make the discovered devices available */ + pci_bus_add_devices(child_bus); + return 0; +} + +static void enable_eeh(struct device_node *dn) +{ + struct device_node *sib; + + for (sib = dn->child; sib; sib = sib->sibling) + enable_eeh(sib); + eeh_add_device_early(dn); + return; + +} + +static void print_slot_pci_funcs(struct slot *slot) +{ + struct pci_dev *dev; + + if (slot->dev_type == PCI_DEV) { + dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, slot->name); + list_for_each_entry (dev, slot->dev.pci_devs, bus_list) + dbg("\t%s\n", pci_name(dev)); + } + return; +} + +static int rpaphp_config_pci_adapter(struct slot *slot) +{ + struct pci_bus *pci_bus; + struct pci_dev *dev; + int rc = -ENODEV; + + dbg("Entry %s: slot[%s]\n", __FUNCTION__, slot->name); + + if (slot->bridge) { + + pci_bus = slot->bridge->subordinate; + if (!pci_bus) { + err("%s: can't find bus structure\n", __FUNCTION__); + goto exit; + } + enable_eeh(slot->dn); + dev = rpaphp_pci_config_slot(slot->dn, pci_bus); + if (!dev) { + err("%s: can't find any devices.\n", __FUNCTION__); + goto exit; + } + print_slot_pci_funcs(slot); + rc = 0; + } else { + /* slot is not enabled */ + err("slot doesn't have pci_dev structure\n"); + } +exit: + dbg("Exit %s: rc=%d\n", __FUNCTION__, rc); + return rc; +} + +static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev) +{ + eeh_remove_device(dev); + if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { + struct pci_bus *bus = dev->subordinate; + struct list_head *ln; + if (!bus) + return; + for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) { + struct pci_dev *pdev = pci_dev_b(ln); + if (pdev) + rpaphp_eeh_remove_bus_device(pdev); + } + + } + return; +} + +int rpaphp_unconfig_pci_adapter(struct slot *slot) +{ + struct pci_dev *dev; + int retval = 0; + + list_for_each_entry(dev, slot->dev.pci_devs, bus_list) + rpaphp_eeh_remove_bus_device(dev); + + pci_remove_behind_bridge(slot->bridge); + slot->state = NOT_CONFIGURED; + info("%s: devices in slot[%s] unconfigured.\n", __FUNCTION__, + slot->name); + return retval; +} + +static int setup_pci_hotplug_slot_info(struct slot *slot) +{ + dbg("%s Initilize the PCI slot's hotplug->info structure ...\n", + __FUNCTION__); + rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status); + rpaphp_get_pci_adapter_status(slot, 1, + &slot->hotplug_slot->info-> + adapter_status); + if (slot->hotplug_slot->info->adapter_status == NOT_VALID) { + err("%s: NOT_VALID: skip dn->full_name=%s\n", + __FUNCTION__, slot->dn->full_name); + return -EINVAL; + } + return 0; +} + +static int set_phb_slot_name(struct slot *slot) +{ + struct device_node *dn; + struct pci_controller *phb; + struct pci_bus *bus; + + dn = slot->dn; + if (!dn) { + return -EINVAL; + } + phb = dn->phb; + if (!phb) { + return -EINVAL; + } + bus = phb->bus; + if (!bus) { + return -EINVAL; + } + + sprintf(slot->name, "%04x:%02x:%02x.%x", pci_domain_nr(bus), + bus->number, 0, 0); + return 0; +} + +static int setup_pci_slot(struct slot *slot) +{ + struct pci_bus *bus; + int rc; + + if (slot->type == PHB) { + rc = set_phb_slot_name(slot); + if (rc < 0) { + err("%s: failed to set phb slot name\n", __FUNCTION__); + goto exit_rc; + } + } else { + slot->bridge = rpaphp_find_bridge_pdev(slot); + if (!slot->bridge) { + /* slot being added doesn't have pci_dev yet */ + err("%s: no pci_dev for bridge dn %s\n", + __FUNCTION__, slot->name); + goto exit_rc; + } + + bus = slot->bridge->subordinate; + if (!bus) + goto exit_rc; + slot->dev.pci_devs = &bus->devices; + + dbg("%s set slot->name to %s\n", __FUNCTION__, + pci_name(slot->bridge)); + strcpy(slot->name, pci_name(slot->bridge)); + } + + /* find slot's pci_dev if it's not empty */ + if (slot->hotplug_slot->info->adapter_status == EMPTY) { + slot->state = EMPTY; /* slot is empty */ + } else { + /* slot is occupied */ + if (!(slot->dn->child)) { + /* non-empty slot has to have child */ + err("%s: slot[%s]'s device_node doesn't have child for adapter\n", + __FUNCTION__, slot->name); + goto exit_rc; + } + + if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) { + dbg("%s CONFIGURING pci adapter in slot[%s]\n", + __FUNCTION__, slot->name); + if (rpaphp_config_pci_adapter(slot)) { + err("%s: CONFIG pci adapter failed\n", __FUNCTION__); + goto exit_rc; + } + + } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) { + err("%s: slot[%s]'s adapter_status is NOT_VALID.\n", + __FUNCTION__, slot->name); + goto exit_rc; + } + print_slot_pci_funcs(slot); + if (!list_empty(slot->dev.pci_devs)) { + slot->state = CONFIGURED; + } else { + /* DLPAR add as opposed to + * boot time */ + slot->state = NOT_CONFIGURED; + } + } + return 0; +exit_rc: + dealloc_slot_struct(slot); + return -EINVAL; +} + +int register_pci_slot(struct slot *slot) +{ + int rc = -EINVAL; + + slot->dev_type = PCI_DEV; + if ((slot->type == EMBEDDED) || (slot->type == PHB)) + slot->removable = 0; + else + slot->removable = 1; + if (setup_pci_hotplug_slot_info(slot)) + goto exit_rc; + if (setup_pci_slot(slot)) + goto exit_rc; + rc = register_slot(slot); +exit_rc: + return rc; +} + +int rpaphp_enable_pci_slot(struct slot *slot) +{ + int retval = 0, state; + + retval = rpaphp_get_sensor_state(slot, &state); + if (retval) + goto exit; + dbg("%s: sensor state[%d]\n", __FUNCTION__, state); + /* if slot is not empty, enable the adapter */ + if (state == PRESENT) { + dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name); + retval = rpaphp_config_pci_adapter(slot); + if (!retval) { + slot->state = CONFIGURED; + dbg("%s: PCI devices in slot[%s] has been configured\n", + __FUNCTION__, slot->name); + } else { + slot->state = NOT_CONFIGURED; + dbg("%s: no pci_dev struct for adapter in slot[%s]\n", + __FUNCTION__, slot->name); + } + } else if (state == EMPTY) { + dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name); + slot->state = EMPTY; + } else { + err("%s: slot[%s] is in invalid state\n", __FUNCTION__, + slot->name); + slot->state = NOT_VALID; + retval = -EINVAL; + } +exit: + dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval); + return retval; +} + +struct hotplug_slot *rpaphp_find_hotplug_slot(struct pci_dev *dev) +{ + struct list_head *tmp, *n; + struct slot *slot; + + list_for_each_safe(tmp, n, &rpaphp_slot_head) { + struct pci_bus *bus; + struct list_head *ln; + + slot = list_entry(tmp, struct slot, rpaphp_slot_list); + if (slot->bridge == NULL) { + if (slot->dev_type == PCI_DEV) { + printk(KERN_WARNING "PCI slot missing bridge %s %s \n", + slot->name, slot->location); + } + continue; + } + + bus = slot->bridge->subordinate; + if (!bus) { + continue; /* should never happen? */ + } + for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) { + struct pci_dev *pdev = pci_dev_b(ln); + if (pdev == dev) + return slot->hotplug_slot; + } + } + + return NULL; +} + +EXPORT_SYMBOL_GPL(rpaphp_find_hotplug_slot); 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