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/* Copyright 2013-2016 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <skiboot.h>
#include <opal-msg.h>
#include <pci-cfg.h>
#include <pci.h>
#include <pci-slot.h>
/* Debugging options */
#define PCI_SLOT_PREFIX "PCI-SLOT-%016llx "
#define PCI_SLOT_DBG(s, fmt, a...) \
prlog(PR_DEBUG, PCI_SLOT_PREFIX fmt, (s)->id, ##a)
static void pci_slot_prepare_link_change(struct pci_slot *slot, bool up)
{
struct phb *phb = slot->phb;
struct pci_device *pd = slot->pd;
uint32_t aercap, mask;
/*
* Mask the link down and receiver error before the link becomes
* down. Otherwise, unmask the errors when the link is up.
*/
if (pci_has_cap(pd, PCIECAP_ID_AER, true)) {
aercap = pci_cap(pd, PCIECAP_ID_AER, true);
/* Mask link surprise down event. The event is always
* masked when the associated PCI slot supports PCI
* surprise hotplug. We needn't toggle it when the link
* bounces caused by reset and just keep it always masked.
*/
if (!pd->slot || !pd->slot->surprise_pluggable) {
pci_cfg_read32(phb, pd->bdfn,
aercap + PCIECAP_AER_UE_MASK, &mask);
if (up)
mask &= ~PCIECAP_AER_UE_MASK_SURPRISE_DOWN;
else
mask |= PCIECAP_AER_UE_MASK_SURPRISE_DOWN;
pci_cfg_write32(phb, pd->bdfn,
aercap + PCIECAP_AER_UE_MASK, mask);
}
/* Receiver error */
pci_cfg_read32(phb, pd->bdfn, aercap + PCIECAP_AER_CE_MASK,
&mask);
if (up)
mask &= ~PCIECAP_AER_CE_RECVR_ERR;
else
mask |= PCIECAP_AER_CE_RECVR_ERR;
pci_cfg_write32(phb, pd->bdfn, aercap + PCIECAP_AER_CE_MASK,
mask);
}
/*
* We're coming back from reset. We need restore bus ranges
* and reinitialize the affected bridges and devices.
*/
if (up) {
pci_restore_bridge_buses(phb, pd);
if (phb->ops->device_init)
pci_walk_dev(phb, pd, phb->ops->device_init, NULL);
}
}
static int64_t pci_slot_run_sm(struct pci_slot *slot)
{
uint64_t now = mftb();
int64_t ret;
/* Return remaining timeout if we're still waiting */
if (slot->delay_tgt_tb &&
tb_compare(now, slot->delay_tgt_tb) == TB_ABEFOREB)
return slot->delay_tgt_tb - now;
slot->delay_tgt_tb = 0;
switch (slot->state & PCI_SLOT_STATE_MASK) {
case PCI_SLOT_STATE_LINK:
ret = slot->ops.poll_link(slot);
break;
case PCI_SLOT_STATE_HRESET:
ret = slot->ops.hreset(slot);
break;
case PCI_SLOT_STATE_FRESET:
ret = slot->ops.freset(slot);
break;
case PCI_SLOT_STATE_CRESET:
ret = slot->ops.creset(slot);
break;
default:
prlog(PR_ERR, PCI_SLOT_PREFIX
"Invalid state %08x\n", slot->id, slot->state);
pci_slot_set_state(slot, PCI_SLOT_STATE_NORMAL);
ret = OPAL_HARDWARE;
}
/* Notify about the pci slot state machine completion */
if (ret <= 0 && slot->ops.completed_sm_run)
slot->ops.completed_sm_run(slot, ret);
return ret;
}
void pci_slot_add_dt_properties(struct pci_slot *slot,
struct dt_node *np)
{
/* Bail without device node */
if (!np)
return;
dt_add_property_cells(np, "ibm,reset-by-firmware", 1);
dt_add_property_cells(np, "ibm,slot-pluggable", slot->pluggable);
dt_add_property_cells(np, "ibm,slot-surprise-pluggable",
slot->surprise_pluggable);
if (pci_slot_has_flags(slot, PCI_SLOT_FLAG_BROKEN_PDC))
dt_add_property_cells(np, "ibm,slot-broken-pdc", 1);
dt_add_property_cells(np, "ibm,slot-power-ctl", slot->power_ctl);
dt_add_property_cells(np, "ibm,slot-power-led-ctlled",
slot->power_led_ctl);
dt_add_property_cells(np, "ibm,slot-attn-led", slot->attn_led_ctl);
dt_add_property_cells(np, "ibm,slot-connector-type",
slot->connector_type);
dt_add_property_cells(np, "ibm,slot-card-desc", slot->card_desc);
dt_add_property_cells(np, "ibm,slot-card-mech", slot->card_mech);
dt_add_property_cells(np, "ibm,slot-wired-lanes", slot->wired_lanes);
dt_add_property_cells(np, "ibm,power-limit", slot->power_limit);
if (slot->ops.add_properties)
slot->ops.add_properties(slot, np);
}
struct pci_slot *pci_slot_alloc(struct phb *phb,
struct pci_device *pd)
{
struct pci_slot *slot = NULL;
/*
* The function can be used to allocate either PHB slot or normal
* one. For both cases, the @phb should be always valid.
*/
if (!phb)
return NULL;
/*
* When @pd is NULL, we're going to create a PHB slot. Otherwise,
* a normal slot will be created. Check if the specified slot
* already exists or not.
*/
slot = pd ? pd->slot : phb->slot;
if (slot) {
prlog(PR_ERR, PCI_SLOT_PREFIX "Already exists\n", slot->id);
return slot;
}
/* Allocate memory chunk */
slot = zalloc(sizeof(struct pci_slot));
if (!slot) {
prlog(PR_ERR, "%s: Out of memory\n", __func__);
return NULL;
}
/*
* The polling function sholdn't be overridden by individual
* platforms
*/
slot->phb = phb;
slot->pd = pd;
pci_slot_set_state(slot, PCI_SLOT_STATE_NORMAL);
slot->power_state = PCI_SLOT_POWER_ON;
slot->ops.run_sm = pci_slot_run_sm;
slot->ops.prepare_link_change = pci_slot_prepare_link_change;
slot->peer_slot = NULL;
if (!pd) {
slot->id = PCI_PHB_SLOT_ID(phb);
phb->slot = slot;
} else {
slot->id = PCI_SLOT_ID(phb, pd->bdfn);
pd->slot = slot;
}
return slot;
}
struct pci_slot *pci_slot_find(uint64_t id)
{
struct phb *phb;
struct pci_device *pd;
struct pci_slot *slot;
uint64_t index;
uint16_t bdfn;
index = PCI_SLOT_PHB_INDEX(id);
phb = pci_get_phb(index);
/* PHB slot */
if (!(id & PCI_SLOT_ID_PREFIX)) {
slot = phb ? phb->slot : NULL;
return slot;
}
/* Normal PCI slot */
bdfn = PCI_SLOT_BDFN(id);
pd = phb ? pci_find_dev(phb, bdfn) : NULL;
slot = pd ? pd->slot : NULL;
return slot;
}
void pci_slot_add_loc(struct pci_slot *slot,
struct dt_node *np, const char *label)
{
char tmp[8], loc_code[LOC_CODE_SIZE];
struct pci_device *pd = slot->pd;
struct phb *phb = slot->phb;
if (!np)
return;
/* didn't get a real slot label? generate one! */
if (!label) {
snprintf(tmp, sizeof(tmp), "S%04x%02x", phb->opal_id,
pd->secondary_bus);
label = tmp;
}
/* Make a <PHB_LOC_CODE>-<LABEL> pair if we have a PHB loc code */
if (phb->base_loc_code) {
snprintf(loc_code, sizeof(loc_code), "%s-%s",
phb->base_loc_code, label);
} else {
strncpy(loc_code, label, sizeof(loc_code));
}
dt_add_property_string(np, "ibm,slot-label", label);
dt_add_property_nstr(np, "ibm,slot-location-code", loc_code,
sizeof(loc_code));
}
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