--- /dev/null
+/*
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/pci.h>
+#include <linux/pci_hotplug.h>
+#include <linux/smp.h>
+#include <linux/init.h>
+#include <linux/vmalloc.h>
+#include <asm/eeh.h> /* for eeh_add_device() */
+#include <asm/rtas.h> /* rtas_call */
+#include <asm/pci-bridge.h> /* for pci_controller */
+#include "../pci.h" /* for pci_add_new_bus */
+ /* and pci_do_scan_bus */
+#include "rpaphp.h"
+
+bool rpaphp_debug;
+LIST_HEAD(rpaphp_slot_head);
+EXPORT_SYMBOL_GPL(rpaphp_slot_head);
+
+#define DRIVER_VERSION "0.1"
+#define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>"
+#define DRIVER_DESC "RPA HOT Plug PCI Controller Driver"
+
+#define MAX_LOC_CODE 128
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+module_param_named(debug, rpaphp_debug, bool, 0644);
+
+/**
+ * set_attention_status - set attention LED
+ * @hotplug_slot: target &hotplug_slot
+ * @value: LED control value
+ *
+ * echo 0 > attention -- set LED OFF
+ * echo 1 > attention -- set LED ON
+ * echo 2 > attention -- set LED ID(identify, light is blinking)
+ */
+static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
+{
+ int rc;
+ struct slot *slot = (struct slot *)hotplug_slot->private;
+
+ switch (value) {
+ case 0:
+ case 1:
+ case 2:
+ break;
+ default:
+ value = 1;
+ break;
+ }
+
+ rc = rtas_set_indicator(DR_INDICATOR, slot->index, value);
+ if (!rc)
+ hotplug_slot->info->attention_status = value;
+
+ return rc;
+}
+
+/**
+ * get_power_status - get power status of a slot
+ * @hotplug_slot: slot to get status
+ * @value: pointer to store status
+ */
+static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+ int retval, level;
+ struct slot *slot = (struct slot *)hotplug_slot->private;
+
+ retval = rtas_get_power_level (slot->power_domain, &level);
+ if (!retval)
+ *value = level;
+ return retval;
+}
+
+/**
+ * get_attention_status - get attention LED status
+ * @hotplug_slot: slot to get status
+ * @value: pointer to store status
+ */
+static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+ struct slot *slot = (struct slot *)hotplug_slot->private;
+ *value = slot->hotplug_slot->info->attention_status;
+ return 0;
+}
+
+static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+ struct slot *slot = (struct slot *)hotplug_slot->private;
+ int rc, state;
+
+ rc = rpaphp_get_sensor_state(slot, &state);
+
+ *value = NOT_VALID;
+ if (rc)
+ return rc;
+
+ if (state == EMPTY)
+ *value = EMPTY;
+ else if (state == PRESENT)
+ *value = slot->state;
+
+ return 0;
+}
+
+static enum pci_bus_speed get_max_bus_speed(struct slot *slot)
+{
+ enum pci_bus_speed speed;
+ switch (slot->type) {
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ case 5:
+ case 6:
+ speed = PCI_SPEED_33MHz; /* speed for case 1-6 */
+ break;
+ case 7:
+ case 8:
+ speed = PCI_SPEED_66MHz;
+ break;
+ case 11:
+ case 14:
+ speed = PCI_SPEED_66MHz_PCIX;
+ break;
+ case 12:
+ case 15:
+ speed = PCI_SPEED_100MHz_PCIX;
+ break;
+ case 13:
+ case 16:
+ speed = PCI_SPEED_133MHz_PCIX;
+ break;
+ default:
+ speed = PCI_SPEED_UNKNOWN;
+ break;
+ }
+
+ return speed;
+}
+
+static int get_children_props(struct device_node *dn, const int **drc_indexes,
+ const int **drc_names, const int **drc_types,
+ const int **drc_power_domains)
+{
+ const int *indexes, *names, *types, *domains;
+
+ indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
+ names = of_get_property(dn, "ibm,drc-names", NULL);
+ types = of_get_property(dn, "ibm,drc-types", NULL);
+ domains = of_get_property(dn, "ibm,drc-power-domains", NULL);
+
+ if (!indexes || !names || !types || !domains) {
+ /* Slot does not have dynamically-removable children */
+ return -EINVAL;
+ }
+ if (drc_indexes)
+ *drc_indexes = indexes;
+ if (drc_names)
+ /* &drc_names[1] contains NULL terminated slot names */
+ *drc_names = names;
+ if (drc_types)
+ /* &drc_types[1] contains NULL terminated slot types */
+ *drc_types = types;
+ if (drc_power_domains)
+ *drc_power_domains = domains;
+
+ return 0;
+}
+
+/* To get the DRC props describing the current node, first obtain it's
+ * my-drc-index property. Next obtain the DRC list from it's parent. Use
+ * the my-drc-index for correlation, and obtain the requested properties.
+ */
+int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
+ char **drc_name, char **drc_type, int *drc_power_domain)
+{
+ const int *indexes, *names;
+ const int *types, *domains;
+ const unsigned int *my_index;
+ char *name_tmp, *type_tmp;
+ int i, rc;
+
+ my_index = of_get_property(dn, "ibm,my-drc-index", NULL);
+ if (!my_index) {
+ /* Node isn't DLPAR/hotplug capable */
+ return -EINVAL;
+ }
+
+ rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
+ if (rc < 0) {
+ return -EINVAL;
+ }
+
+ name_tmp = (char *) &names[1];
+ type_tmp = (char *) &types[1];
+
+ /* Iterate through parent properties, looking for my-drc-index */
+ for (i = 0; i < be32_to_cpu(indexes[0]); i++) {
+ if ((unsigned int) indexes[i + 1] == *my_index) {
+ if (drc_name)
+ *drc_name = name_tmp;
+ if (drc_type)
+ *drc_type = type_tmp;
+ if (drc_index)
+ *drc_index = be32_to_cpu(*my_index);
+ if (drc_power_domain)
+ *drc_power_domain = be32_to_cpu(domains[i+1]);
+ return 0;
+ }
+ name_tmp += (strlen(name_tmp) + 1);
+ type_tmp += (strlen(type_tmp) + 1);
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);
+
+static int is_php_type(char *drc_type)
+{
+ unsigned long value;
+ char *endptr;
+
+ /* PCI Hotplug nodes have an integer for drc_type */
+ value = simple_strtoul(drc_type, &endptr, 10);
+ if (endptr == drc_type)
+ return 0;
+
+ return 1;
+}
+
+/**
+ * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
+ * @dn: target &device_node
+ * @indexes: passed to get_children_props()
+ * @names: passed to get_children_props()
+ * @types: returned from get_children_props()
+ * @power_domains:
+ *
+ * This routine will return true only if the device node is
+ * a hotpluggable slot. This routine will return false
+ * for built-in pci slots (even when the built-in slots are
+ * dlparable.)
+ */
+static int is_php_dn(struct device_node *dn, const int **indexes,
+ const int **names, const int **types, const int **power_domains)
+{
+ const int *drc_types;
+ int rc;
+
+ rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
+ if (rc < 0)
+ return 0;
+
+ if (!is_php_type((char *) &drc_types[1]))
+ return 0;
+
+ *types = drc_types;
+ return 1;
+}
+
+/**
+ * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
+ * @dn: device node of slot
+ *
+ * This subroutine will register a hotpluggable slot with the
+ * PCI hotplug infrastructure. This routine is typically called
+ * during boot time, if the hotplug slots are present at boot time,
+ * or is called later, by the dlpar add code, if the slot is
+ * being dynamically added during runtime.
+ *
+ * If the device node points at an embedded (built-in) slot, this
+ * routine will just return without doing anything, since embedded
+ * slots cannot be hotplugged.
+ *
+ * To remove a slot, it suffices to call rpaphp_deregister_slot().
+ */
+int rpaphp_add_slot(struct device_node *dn)
+{
+ struct slot *slot;
+ int retval = 0;
+ int i;
+ const int *indexes, *names, *types, *power_domains;
+ char *name, *type;
+
+ if (!dn->name || strcmp(dn->name, "pci"))
+ return 0;
+
+ /* If this is not a hotplug slot, return without doing anything. */
+ if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
+ return 0;
+
+ dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name);
+
+ /* register PCI devices */
+ name = (char *) &names[1];
+ type = (char *) &types[1];
+ for (i = 0; i < be32_to_cpu(indexes[0]); i++) {
+ int index;
+
+ index = be32_to_cpu(indexes[i + 1]);
+ slot = alloc_slot_struct(dn, index, name,
+ be32_to_cpu(power_domains[i + 1]));
+ if (!slot)
+ return -ENOMEM;
+
+ slot->type = simple_strtoul(type, NULL, 10);
+
+ dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
+ index, name, type);
+
+ retval = rpaphp_enable_slot(slot);
+ if (!retval)
+ retval = rpaphp_register_slot(slot);
+
+ if (retval)
+ dealloc_slot_struct(slot);
+
+ name += strlen(name) + 1;
+ type += strlen(type) + 1;
+ }
+ dbg("%s - Exit: rc[%d]\n", __func__, retval);
+
+ /* XXX FIXME: reports a failure only if last entry in loop failed */
+ return retval;
+}
+EXPORT_SYMBOL_GPL(rpaphp_add_slot);
+
+static void __exit cleanup_slots(void)
+{
+ struct list_head *tmp, *n;
+ struct slot *slot;
+
+ /*
+ * Unregister all of our slots with the pci_hotplug subsystem,
+ * and free up all memory that we had allocated.
+ * memory will be freed in release_slot callback.
+ */
+
+ list_for_each_safe(tmp, n, &rpaphp_slot_head) {
+ slot = list_entry(tmp, struct slot, rpaphp_slot_list);
+ list_del(&slot->rpaphp_slot_list);
+ pci_hp_deregister(slot->hotplug_slot);
+ }
+ return;
+}
+
+static int __init rpaphp_init(void)
+{
+ struct device_node *dn;
+
+ info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
+
+ for_each_node_by_name(dn, "pci")
+ rpaphp_add_slot(dn);
+
+ return 0;
+}
+
+static void __exit rpaphp_exit(void)
+{
+ cleanup_slots();
+}
+
+static int enable_slot(struct hotplug_slot *hotplug_slot)
+{
+ struct slot *slot = (struct slot *)hotplug_slot->private;
+ int state;
+ int retval;
+
+ if (slot->state == CONFIGURED)
+ return 0;
+
+ retval = rpaphp_get_sensor_state(slot, &state);
+ if (retval)
+ return retval;
+
+ if (state == PRESENT) {
+ pci_lock_rescan_remove();
+ pcibios_add_pci_devices(slot->bus);
+ pci_unlock_rescan_remove();
+ slot->state = CONFIGURED;
+ } else if (state == EMPTY) {
+ slot->state = EMPTY;
+ } else {
+ err("%s: slot[%s] is in invalid state\n", __func__, slot->name);
+ slot->state = NOT_VALID;
+ return -EINVAL;
+ }
+
+ slot->bus->max_bus_speed = get_max_bus_speed(slot);
+ return 0;
+}
+
+static int disable_slot(struct hotplug_slot *hotplug_slot)
+{
+ struct slot *slot = (struct slot *)hotplug_slot->private;
+ if (slot->state == NOT_CONFIGURED)
+ return -EINVAL;
+
+ pci_lock_rescan_remove();
+ pcibios_remove_pci_devices(slot->bus);
+ pci_unlock_rescan_remove();
+ vm_unmap_aliases();
+
+ slot->state = NOT_CONFIGURED;
+ return 0;
+}
+
+struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
+ .enable_slot = enable_slot,
+ .disable_slot = disable_slot,
+ .set_attention_status = set_attention_status,
+ .get_power_status = get_power_status,
+ .get_attention_status = get_attention_status,
+ .get_adapter_status = get_adapter_status,
+};
+
+module_init(rpaphp_init);
+module_exit(rpaphp_exit);
Code Review / kvmfornfv.git / blobdiff