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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/pci/hotplug/rpaphp_pci.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/pci/hotplug/rpaphp_pci.c')
-rw-r--r-- | drivers/pci/hotplug/rpaphp_pci.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/rpaphp_pci.c b/drivers/pci/hotplug/rpaphp_pci.c new file mode 100644 index 000000000..630f77057 --- /dev/null +++ b/drivers/pci/hotplug/rpaphp_pci.c @@ -0,0 +1,117 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform. + * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com> + * + * All rights reserved. + * + * Send feedback to <lxie@us.ibm.com> + * + */ +#include <linux/of.h> +#include <linux/pci.h> +#include <linux/string.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" + +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", + __func__); + + /* 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", + __func__, slot->name, rc); + } else { + rc = rtas_get_sensor(DR_ENTITY_SENSE, + slot->index, state); + } + } else if (rc == -ENODEV) + info("%s: slot is unusable\n", __func__); + else + err("%s failed to get sensor state\n", __func__); + } + return rc; +} + +/** + * rpaphp_enable_slot - record slot state, config pci device + * @slot: target &slot + * + * Initialize values in the slot structure to indicate if there is a pci card + * plugged into the slot. If the slot is not empty, run the pcibios routine + * to get pcibios stuff correctly set up. + */ +int rpaphp_enable_slot(struct slot *slot) +{ + int rc, level, state; + struct pci_bus *bus; + + slot->state = EMPTY; + + /* Find out if the power is turned on for the slot */ + rc = rtas_get_power_level(slot->power_domain, &level); + if (rc) + return rc; + + /* Figure out if there is an adapter in the slot */ + rc = rpaphp_get_sensor_state(slot, &state); + if (rc) + return rc; + + bus = pci_find_bus_by_node(slot->dn); + if (!bus) { + err("%s: no pci_bus for dn %pOF\n", __func__, slot->dn); + return -EINVAL; + } + + slot->bus = bus; + slot->pci_devs = &bus->devices; + + /* if there's an adapter in the slot, go add the pci devices */ + if (state == PRESENT) { + slot->state = NOT_CONFIGURED; + + /* non-empty slot has to have child */ + if (!slot->dn->child) { + err("%s: slot[%s]'s device_node doesn't have child for adapter\n", + __func__, slot->name); + return -EINVAL; + } + + if (list_empty(&bus->devices)) { + pseries_eeh_init_edev_recursive(PCI_DN(slot->dn)); + pci_hp_add_devices(bus); + } + + if (!list_empty(&bus->devices)) { + slot->state = CONFIGURED; + } + + if (rpaphp_debug) { + struct pci_dev *dev; + dbg("%s: pci_devs of slot[%pOF]\n", __func__, slot->dn); + list_for_each_entry(dev, &bus->devices, bus_list) + dbg("\t%s\n", pci_name(dev)); + } + } + + return 0; +} |