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116 lines
2.7 KiB
116 lines
2.7 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform. |
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* Copyright (C) 2003 Linda Xie <[email protected]> |
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* |
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* All rights reserved. |
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* |
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* Send feedback to <[email protected]> |
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* |
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*/ |
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#include <linux/pci.h> |
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#include <linux/string.h> |
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#include <asm/pci-bridge.h> |
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#include <asm/rtas.h> |
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#include <asm/machdep.h> |
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#include "../pci.h" /* for pci_add_new_bus */ |
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#include "rpaphp.h" |
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int rpaphp_get_sensor_state(struct slot *slot, int *state) |
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{ |
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int rc; |
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int setlevel; |
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rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state); |
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if (rc < 0) { |
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if (rc == -EFAULT || rc == -EEXIST) { |
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dbg("%s: slot must be power up to get sensor-state\n", |
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__func__); |
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/* some slots have to be powered up |
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* before get-sensor will succeed. |
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*/ |
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rc = rtas_set_power_level(slot->power_domain, POWER_ON, |
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&setlevel); |
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if (rc < 0) { |
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dbg("%s: power on slot[%s] failed rc=%d.\n", |
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__func__, slot->name, rc); |
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} else { |
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rc = rtas_get_sensor(DR_ENTITY_SENSE, |
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slot->index, state); |
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} |
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} else if (rc == -ENODEV) |
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info("%s: slot is unusable\n", __func__); |
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else |
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err("%s failed to get sensor state\n", __func__); |
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} |
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return rc; |
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} |
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/** |
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* rpaphp_enable_slot - record slot state, config pci device |
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* @slot: target &slot |
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* |
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* Initialize values in the slot structure to indicate if there is a pci card |
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* plugged into the slot. If the slot is not empty, run the pcibios routine |
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* to get pcibios stuff correctly set up. |
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*/ |
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int rpaphp_enable_slot(struct slot *slot) |
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{ |
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int rc, level, state; |
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struct pci_bus *bus; |
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slot->state = EMPTY; |
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/* Find out if the power is turned on for the slot */ |
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rc = rtas_get_power_level(slot->power_domain, &level); |
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if (rc) |
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return rc; |
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/* Figure out if there is an adapter in the slot */ |
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rc = rpaphp_get_sensor_state(slot, &state); |
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if (rc) |
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return rc; |
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bus = pci_find_bus_by_node(slot->dn); |
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if (!bus) { |
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err("%s: no pci_bus for dn %pOF\n", __func__, slot->dn); |
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return -EINVAL; |
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} |
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slot->bus = bus; |
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slot->pci_devs = &bus->devices; |
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/* if there's an adapter in the slot, go add the pci devices */ |
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if (state == PRESENT) { |
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slot->state = NOT_CONFIGURED; |
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/* non-empty slot has to have child */ |
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if (!slot->dn->child) { |
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err("%s: slot[%s]'s device_node doesn't have child for adapter\n", |
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__func__, slot->name); |
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return -EINVAL; |
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} |
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if (list_empty(&bus->devices)) { |
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pseries_eeh_init_edev_recursive(PCI_DN(slot->dn)); |
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pci_hp_add_devices(bus); |
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} |
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if (!list_empty(&bus->devices)) { |
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slot->state = CONFIGURED; |
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} |
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if (rpaphp_debug) { |
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struct pci_dev *dev; |
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dbg("%s: pci_devs of slot[%pOF]\n", __func__, slot->dn); |
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list_for_each_entry(dev, &bus->devices, bus_list) |
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dbg("\t%s\n", pci_name(dev)); |
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} |
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} |
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return 0; |
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}
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