442 lines
11 KiB
C
442 lines
11 KiB
C
/*
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* PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
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* Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <lxie@us.ibm.com>
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <asm/eeh.h> /* for eeh_add_device() */
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#include <asm/rtas.h> /* rtas_call */
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#include <asm/pci-bridge.h> /* for pci_controller */
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#include "../pci.h" /* for pci_add_new_bus */
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/* and pci_do_scan_bus */
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#include "rpaphp.h"
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int rpaphp_debug;
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LIST_HEAD(rpaphp_slot_head);
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#define DRIVER_VERSION "0.1"
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#define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>"
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#define DRIVER_DESC "RPA HOT Plug PCI Controller Driver"
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#define MAX_LOC_CODE 128
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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module_param_named(debug, rpaphp_debug, bool, 0644);
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/**
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* set_attention_status - set attention LED
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* @hotplug_slot: target &hotplug_slot
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* @value: LED control value
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*
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* echo 0 > attention -- set LED OFF
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* echo 1 > attention -- set LED ON
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* echo 2 > attention -- set LED ID(identify, light is blinking)
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*/
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static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
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{
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int rc;
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struct slot *slot = (struct slot *)hotplug_slot->private;
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switch (value) {
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case 0:
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case 1:
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case 2:
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break;
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default:
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value = 1;
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break;
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}
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rc = rtas_set_indicator(DR_INDICATOR, slot->index, value);
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if (!rc)
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hotplug_slot->info->attention_status = value;
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return rc;
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}
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/**
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* get_power_status - get power status of a slot
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* @hotplug_slot: slot to get status
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* @value: pointer to store status
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*/
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static int get_power_status(struct hotplug_slot *hotplug_slot, u8 * value)
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{
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int retval, level;
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struct slot *slot = (struct slot *)hotplug_slot->private;
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retval = rtas_get_power_level (slot->power_domain, &level);
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if (!retval)
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*value = level;
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return retval;
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}
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/**
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* get_attention_status - get attention LED status
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* @hotplug_slot: slot to get status
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* @value: pointer to store status
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*/
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static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
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{
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struct slot *slot = (struct slot *)hotplug_slot->private;
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*value = slot->hotplug_slot->info->attention_status;
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return 0;
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}
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static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value)
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{
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struct slot *slot = (struct slot *)hotplug_slot->private;
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int rc, state;
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rc = rpaphp_get_sensor_state(slot, &state);
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*value = NOT_VALID;
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if (rc)
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return rc;
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if (state == EMPTY)
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*value = EMPTY;
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else if (state == PRESENT)
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*value = slot->state;
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return 0;
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}
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static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
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{
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struct slot *slot = (struct slot *)hotplug_slot->private;
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switch (slot->type) {
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case 1:
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case 2:
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case 3:
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case 4:
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case 5:
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case 6:
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*value = PCI_SPEED_33MHz; /* speed for case 1-6 */
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break;
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case 7:
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case 8:
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*value = PCI_SPEED_66MHz;
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break;
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case 11:
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case 14:
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*value = PCI_SPEED_66MHz_PCIX;
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break;
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case 12:
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case 15:
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*value = PCI_SPEED_100MHz_PCIX;
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break;
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case 13:
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case 16:
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*value = PCI_SPEED_133MHz_PCIX;
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break;
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default:
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*value = PCI_SPEED_UNKNOWN;
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break;
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}
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return 0;
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}
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static int get_children_props(struct device_node *dn, const int **drc_indexes,
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const int **drc_names, const int **drc_types,
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const int **drc_power_domains)
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{
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const int *indexes, *names, *types, *domains;
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indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
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names = of_get_property(dn, "ibm,drc-names", NULL);
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types = of_get_property(dn, "ibm,drc-types", NULL);
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domains = of_get_property(dn, "ibm,drc-power-domains", NULL);
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if (!indexes || !names || !types || !domains) {
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/* Slot does not have dynamically-removable children */
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return -EINVAL;
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}
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if (drc_indexes)
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*drc_indexes = indexes;
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if (drc_names)
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/* &drc_names[1] contains NULL terminated slot names */
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*drc_names = names;
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if (drc_types)
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/* &drc_types[1] contains NULL terminated slot types */
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*drc_types = types;
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if (drc_power_domains)
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*drc_power_domains = domains;
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return 0;
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}
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/* To get the DRC props describing the current node, first obtain it's
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* my-drc-index property. Next obtain the DRC list from it's parent. Use
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* the my-drc-index for correlation, and obtain the requested properties.
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*/
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int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
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char **drc_name, char **drc_type, int *drc_power_domain)
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{
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const int *indexes, *names;
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const int *types, *domains;
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const unsigned int *my_index;
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char *name_tmp, *type_tmp;
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int i, rc;
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my_index = of_get_property(dn, "ibm,my-drc-index", NULL);
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if (!my_index) {
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/* Node isn't DLPAR/hotplug capable */
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return -EINVAL;
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}
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rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
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if (rc < 0) {
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return -EINVAL;
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}
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name_tmp = (char *) &names[1];
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type_tmp = (char *) &types[1];
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/* Iterate through parent properties, looking for my-drc-index */
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for (i = 0; i < indexes[0]; i++) {
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if ((unsigned int) indexes[i + 1] == *my_index) {
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if (drc_name)
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*drc_name = name_tmp;
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if (drc_type)
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*drc_type = type_tmp;
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if (drc_index)
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*drc_index = *my_index;
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if (drc_power_domain)
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*drc_power_domain = domains[i+1];
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return 0;
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}
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name_tmp += (strlen(name_tmp) + 1);
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type_tmp += (strlen(type_tmp) + 1);
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}
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return -EINVAL;
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}
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static int is_php_type(char *drc_type)
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{
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unsigned long value;
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char *endptr;
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/* PCI Hotplug nodes have an integer for drc_type */
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value = simple_strtoul(drc_type, &endptr, 10);
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if (endptr == drc_type)
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return 0;
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return 1;
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}
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/**
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* is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
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* @dn: target &device_node
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* @indexes: passed to get_children_props()
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* @names: passed to get_children_props()
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* @types: returned from get_children_props()
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* @power_domains:
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*
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* This routine will return true only if the device node is
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* a hotpluggable slot. This routine will return false
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* for built-in pci slots (even when the built-in slots are
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* dlparable.)
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*/
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static int is_php_dn(struct device_node *dn, const int **indexes,
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const int **names, const int **types, const int **power_domains)
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{
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const int *drc_types;
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int rc;
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rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
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if (rc < 0)
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return 0;
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if (!is_php_type((char *) &drc_types[1]))
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return 0;
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*types = drc_types;
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return 1;
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}
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/**
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* rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
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* @dn: device node of slot
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*
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* This subroutine will register a hotplugable slot with the
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* PCI hotplug infrastructure. This routine is typicaly called
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* during boot time, if the hotplug slots are present at boot time,
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* or is called later, by the dlpar add code, if the slot is
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* being dynamically added during runtime.
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*
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* If the device node points at an embedded (built-in) slot, this
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* routine will just return without doing anything, since embedded
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* slots cannot be hotplugged.
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*
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* To remove a slot, it suffices to call rpaphp_deregister_slot().
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*/
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int rpaphp_add_slot(struct device_node *dn)
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{
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struct slot *slot;
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int retval = 0;
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int i;
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const int *indexes, *names, *types, *power_domains;
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char *name, *type;
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if (!dn->name || strcmp(dn->name, "pci"))
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return 0;
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/* If this is not a hotplug slot, return without doing anything. */
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if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
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return 0;
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dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name);
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/* register PCI devices */
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name = (char *) &names[1];
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type = (char *) &types[1];
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for (i = 0; i < indexes[0]; i++) {
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slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]);
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if (!slot)
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return -ENOMEM;
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slot->type = simple_strtoul(type, NULL, 10);
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dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
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indexes[i + 1], name, type);
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retval = rpaphp_enable_slot(slot);
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if (!retval)
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retval = rpaphp_register_slot(slot);
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if (retval)
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dealloc_slot_struct(slot);
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name += strlen(name) + 1;
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type += strlen(type) + 1;
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}
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dbg("%s - Exit: rc[%d]\n", __func__, retval);
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/* XXX FIXME: reports a failure only if last entry in loop failed */
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return retval;
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}
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static void __exit cleanup_slots(void)
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{
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struct list_head *tmp, *n;
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struct slot *slot;
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/*
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* Unregister all of our slots with the pci_hotplug subsystem,
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* and free up all memory that we had allocated.
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* memory will be freed in release_slot callback.
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*/
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list_for_each_safe(tmp, n, &rpaphp_slot_head) {
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slot = list_entry(tmp, struct slot, rpaphp_slot_list);
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list_del(&slot->rpaphp_slot_list);
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pci_hp_deregister(slot->hotplug_slot);
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}
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return;
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}
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static int __init rpaphp_init(void)
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{
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struct device_node *dn = NULL;
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info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
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while ((dn = of_find_node_by_name(dn, "pci")))
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rpaphp_add_slot(dn);
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return 0;
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}
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static void __exit rpaphp_exit(void)
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{
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cleanup_slots();
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}
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static int enable_slot(struct hotplug_slot *hotplug_slot)
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{
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struct slot *slot = (struct slot *)hotplug_slot->private;
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int state;
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int retval;
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if (slot->state == CONFIGURED)
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return 0;
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retval = rpaphp_get_sensor_state(slot, &state);
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if (retval)
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return retval;
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if (state == PRESENT) {
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pcibios_add_pci_devices(slot->bus);
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slot->state = CONFIGURED;
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} else if (state == EMPTY) {
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slot->state = EMPTY;
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} else {
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err("%s: slot[%s] is in invalid state\n", __func__, slot->name);
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slot->state = NOT_VALID;
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return -EINVAL;
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}
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return 0;
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}
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static int disable_slot(struct hotplug_slot *hotplug_slot)
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{
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struct slot *slot = (struct slot *)hotplug_slot->private;
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if (slot->state == NOT_CONFIGURED)
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return -EINVAL;
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pcibios_remove_pci_devices(slot->bus);
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slot->state = NOT_CONFIGURED;
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return 0;
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}
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struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
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.owner = THIS_MODULE,
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.enable_slot = enable_slot,
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.disable_slot = disable_slot,
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.set_attention_status = set_attention_status,
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.get_power_status = get_power_status,
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.get_attention_status = get_attention_status,
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.get_adapter_status = get_adapter_status,
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.get_max_bus_speed = get_max_bus_speed,
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};
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module_init(rpaphp_init);
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module_exit(rpaphp_exit);
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EXPORT_SYMBOL_GPL(rpaphp_add_slot);
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EXPORT_SYMBOL_GPL(rpaphp_slot_head);
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EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);
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