/* * 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/slab.h> #include <linux/smp.h> #include <linux/smp_lock.h> #include <linux/init.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" #include "pci_hotplug.h" int debug; static struct semaphore rpaphp_sem; LIST_HEAD(rpaphp_slot_head); int num_slots; #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(debug, bool, 0644); static int rpaphp_get_attention_status(struct slot *slot) { return slot->hotplug_slot->info->attention_status; } /** * set_attention_status - set attention LED * 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 retval = 0; struct slot *slot = (struct slot *)hotplug_slot->private; down(&rpaphp_sem); switch (value) { case 0: retval = rpaphp_set_attention_status(slot, LED_OFF); hotplug_slot->info->attention_status = 0; break; case 1: default: retval = rpaphp_set_attention_status(slot, LED_ON); hotplug_slot->info->attention_status = 1; break; case 2: retval = rpaphp_set_attention_status(slot, LED_ID); hotplug_slot->info->attention_status = 2; break; } up(&rpaphp_sem); return retval; } /** * 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; struct slot *slot = (struct slot *)hotplug_slot->private; down(&rpaphp_sem); retval = rpaphp_get_power_status(slot, value); up(&rpaphp_sem); return retval; } /** * get_attention_status - get attention LED status * * */ static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value) { int retval = 0; struct slot *slot = (struct slot *)hotplug_slot->private; down(&rpaphp_sem); *value = rpaphp_get_attention_status(slot); up(&rpaphp_sem); return retval; } static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value) { struct slot *slot = (struct slot *)hotplug_slot->private; int retval = 0; down(&rpaphp_sem); retval = rpaphp_get_pci_adapter_status(slot, 0, value); up(&rpaphp_sem); return retval; } static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) { struct slot *slot = (struct slot *)hotplug_slot->private; down(&rpaphp_sem); switch (slot->type) { case 1: case 2: case 3: case 4: case 5: case 6: *value = PCI_SPEED_33MHz; /* speed for case 1-6 */ break; case 7: case 8: *value = PCI_SPEED_66MHz; break; case 11: case 14: *value = PCI_SPEED_66MHz_PCIX; break; case 12: case 15: *value = PCI_SPEED_100MHz_PCIX; break; case 13: case 16: *value = PCI_SPEED_133MHz_PCIX; break; default: *value = PCI_SPEED_UNKNOWN; break; } up(&rpaphp_sem); return 0; } static int get_children_props(struct device_node *dn, int **drc_indexes, int **drc_names, int **drc_types, int **drc_power_domains) { int *indexes, *names; int *types, *domains; indexes = (int *) get_property(dn, "ibm,drc-indexes", NULL); names = (int *) get_property(dn, "ibm,drc-names", NULL); types = (int *) get_property(dn, "ibm,drc-types", NULL); domains = (int *) 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) { int *indexes, *names; int *types, *domains; unsigned int *my_index; char *name_tmp, *type_tmp; int i, rc; my_index = (int *) 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 < 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 = *my_index; if (drc_power_domain) *drc_power_domain = domains[i+1]; return 0; } name_tmp += (strlen(name_tmp) + 1); type_tmp += (strlen(type_tmp) + 1); } return -EINVAL; } 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; } static int is_php_dn(struct device_node *dn, int **indexes, int **names, int **types, int **power_domains) { int *drc_types; int rc; rc = get_children_props(dn, indexes, names, &drc_types, power_domains); if (rc >= 0) { if (is_php_type((char *) &drc_types[1])) { *types = drc_types; return 1; } } return 0; } /** * rpaphp_add_slot -- add hotplug or dlpar slot * * rpaphp not only registers PCI hotplug slots(HOTPLUG), * but also logical DR slots(EMBEDDED). * HOTPLUG slot: An adapter can be physically added/removed. * EMBEDDED slot: An adapter can be logically removed/added * from/to a partition with the slot. */ int rpaphp_add_slot(struct device_node *dn) { struct slot *slot; int retval = 0; int i; int *indexes, *names, *types, *power_domains; char *name, *type; dbg("Entry %s: dn->full_name=%s\n", __FUNCTION__, dn->full_name); /* register PCI devices */ if (dn->name != 0 && strcmp(dn->name, "pci") == 0) { if (!is_php_dn(dn, &indexes, &names, &types, &power_domains)) goto exit; name = (char *) &names[1]; type = (char *) &types[1]; for (i = 0; i < indexes[0]; i++, name += (strlen(name) + 1), type += (strlen(type) + 1)) { if (!(slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]))) { retval = -ENOMEM; goto exit; } slot->type = simple_strtoul(type, NULL, 10); dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n", indexes[i + 1], name, type); retval = rpaphp_register_pci_slot(slot); } } exit: dbg("%s - Exit: num_slots=%d rc[%d]\n", __FUNCTION__, num_slots, retval); return retval; } 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 = NULL; info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); init_MUTEX(&rpaphp_sem); while ((dn = of_find_node_by_type(dn, "pci"))) rpaphp_add_slot(dn); return 0; } static void __exit rpaphp_exit(void) { cleanup_slots(); } static int __enable_slot(struct slot *slot) { int state; int retval; if (slot->state == CONFIGURED) return 0; retval = rpaphp_get_sensor_state(slot, &state); if (retval) return retval; if (state == PRESENT) { pcibios_add_pci_devices(slot->bus); slot->state = CONFIGURED; } else if (state == EMPTY) { slot->state = EMPTY; } else { err("%s: slot[%s] is in invalid state\n", __FUNCTION__, slot->name); slot->state = NOT_VALID; return -EINVAL; } return 0; } static int enable_slot(struct hotplug_slot *hotplug_slot) { int retval; struct slot *slot = (struct slot *)hotplug_slot->private; down(&rpaphp_sem); retval = __enable_slot(slot); up(&rpaphp_sem); return retval; } static int __disable_slot(struct slot *slot) { struct pci_dev *dev, *tmp; if (slot->state == NOT_CONFIGURED) return -EINVAL; list_for_each_entry_safe(dev, tmp, &slot->bus->devices, bus_list) { eeh_remove_bus_device(dev); pci_remove_bus_device(dev); } slot->state = NOT_CONFIGURED; return 0; } static int disable_slot(struct hotplug_slot *hotplug_slot) { struct slot *slot = (struct slot *)hotplug_slot->private; int retval; down(&rpaphp_sem); retval = __disable_slot (slot); up(&rpaphp_sem); return retval; } struct hotplug_slot_ops rpaphp_hotplug_slot_ops = { .owner = THIS_MODULE, .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, .get_max_bus_speed = get_max_bus_speed, }; module_init(rpaphp_init); module_exit(rpaphp_exit); EXPORT_SYMBOL_GPL(rpaphp_add_slot); EXPORT_SYMBOL_GPL(rpaphp_slot_head); EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);