1/*
2 * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
3 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
4 *
5 * All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or (at
10 * your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
15 * NON INFRINGEMENT.  See the GNU General Public License for more
16 * details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * Send feedback to <lxie@us.ibm.com>
23 *
24 */
25#include <linux/pci.h>
26#include <linux/string.h>
27
28#include <asm/pci-bridge.h>
29#include <asm/rtas.h>
30#include <asm/machdep.h>
31
32#include "../pci.h"		/* for pci_add_new_bus */
33#include "rpaphp.h"
34
35int rpaphp_get_sensor_state(struct slot *slot, int *state)
36{
37	int rc;
38	int setlevel;
39
40	rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
41
42	if (rc < 0) {
43		if (rc == -EFAULT || rc == -EEXIST) {
44			dbg("%s: slot must be power up to get sensor-state\n",
45			    __FUNCTION__);
46
47			/* some slots have to be powered up
48			 * before get-sensor will succeed.
49			 */
50			rc = rtas_set_power_level(slot->power_domain, POWER_ON,
51						  &setlevel);
52			if (rc < 0) {
53				dbg("%s: power on slot[%s] failed rc=%d.\n",
54				    __FUNCTION__, slot->name, rc);
55			} else {
56				rc = rtas_get_sensor(DR_ENTITY_SENSE,
57						     slot->index, state);
58			}
59		} else if (rc == -ENODEV)
60			info("%s: slot is unusable\n", __FUNCTION__);
61		else
62			err("%s failed to get sensor state\n", __FUNCTION__);
63	}
64	return rc;
65}
66
67static void set_slot_name(struct slot *slot)
68{
69	struct pci_bus *bus = slot->bus;
70	struct pci_dev *bridge;
71
72	bridge = bus->self;
73	if (bridge)
74		strcpy(slot->name, pci_name(bridge));
75	else
76		sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus),
77			bus->number);
78}
79
80/**
81 * rpaphp_enable_slot - record slot state, config pci device
82 *
83 * Initialize values in the slot, and the hotplug_slot info
84 * structures to indicate if there is a pci card plugged into
85 * the slot. If the slot is not empty, run the pcibios routine
86 * to get pcibios stuff correctly set up.
87 */
88int rpaphp_enable_slot(struct slot *slot)
89{
90	int rc, level, state;
91	struct pci_bus *bus;
92	struct hotplug_slot_info *info = slot->hotplug_slot->info;
93
94	info->adapter_status = NOT_VALID;
95	slot->state = EMPTY;
96
97	/* Find out if the power is turned on for the slot */
98	rc = rtas_get_power_level(slot->power_domain, &level);
99	if (rc)
100		return rc;
101	info->power_status = level;
102
103	/* Figure out if there is an adapter in the slot */
104	rc = rpaphp_get_sensor_state(slot, &state);
105	if (rc)
106		return rc;
107
108	bus = pcibios_find_pci_bus(slot->dn);
109	if (!bus) {
110		err("%s: no pci_bus for dn %s\n", __FUNCTION__, slot->dn->full_name);
111		return -EINVAL;
112	}
113
114	info->adapter_status = EMPTY;
115	slot->bus = bus;
116	slot->pci_devs = &bus->devices;
117	set_slot_name(slot);
118
119	/* if there's an adapter in the slot, go add the pci devices */
120	if (state == PRESENT) {
121		info->adapter_status = NOT_CONFIGURED;
122		slot->state = NOT_CONFIGURED;
123
124		/* non-empty slot has to have child */
125		if (!slot->dn->child) {
126			err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
127			    __FUNCTION__, slot->name);
128			return -EINVAL;
129		}
130
131		if (list_empty(&bus->devices))
132			pcibios_add_pci_devices(bus);
133
134		if (!list_empty(&bus->devices)) {
135			info->adapter_status = CONFIGURED;
136			slot->state = CONFIGURED;
137		}
138
139		if (debug) {
140			struct pci_dev *dev;
141			dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, slot->dn->full_name);
142			list_for_each_entry (dev, &bus->devices, bus_list)
143				dbg("\t%s\n", pci_name(dev));
144		}
145	}
146
147	return 0;
148}
149