/*
* 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);
