summaryrefslogtreecommitdiff
path: root/drivers/pci/hotplug/rpaphp_pci.c
blob: 1a12ebd10e34d99f6f3b011b7b0f14d9b71f7147 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
/*
 * 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/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"

static 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",
			    __FUNCTION__);

			/* 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",
				    __FUNCTION__, slot->name, rc);
			} else {
				rc = rtas_get_sensor(DR_ENTITY_SENSE,
						     slot->index, state);
			}
		} else if (rc == -ENODEV)
			info("%s: slot is unusable\n", __FUNCTION__);
		else
			err("%s failed to get sensor state\n", __FUNCTION__);
	}
	return rc;
}

/**
 * get_pci_adapter_status - get the status of a slot
 * 
 * 0-- slot is empty
 * 1-- adapter is configured
 * 2-- adapter is not configured
 * 3-- not valid
 */
int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value)
{
	struct pci_bus *bus;
	int state, rc;

	*value = NOT_VALID;
	rc = rpaphp_get_sensor_state(slot, &state);
	if (rc)
		goto exit;

 	if (state == EMPTY)
 		*value = EMPTY;
 	else if (state == PRESENT) {
		if (!is_init) {
			/* at run-time slot->state can be changed by */
			/* config/unconfig adapter */
			*value = slot->state;
		} else {
			bus = pcibios_find_pci_bus(slot->dn);
			if (bus && !list_empty(&bus->devices))
				*value = CONFIGURED;
			else
				*value = NOT_CONFIGURED;
		}
	}
exit:
	return rc;
}

static void print_slot_pci_funcs(struct pci_bus *bus)
{
	struct device_node *dn;
	struct pci_dev *dev;

	dn = pci_bus_to_OF_node(bus);
	if (!dn)
		return;

	dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, dn->full_name);
	list_for_each_entry (dev, &bus->devices, bus_list)
		dbg("\t%s\n", pci_name(dev));
	return;
}

int rpaphp_config_pci_adapter(struct pci_bus *bus)
{
	struct device_node *dn = pci_bus_to_OF_node(bus);
	int rc = -ENODEV;

	dbg("Entry %s: slot[%s]\n", __FUNCTION__, dn->full_name);
	if (!dn)
		goto exit;

	pcibios_add_pci_devices(bus);
	print_slot_pci_funcs(bus);
	rc = 0;
exit:
	dbg("Exit %s:  rc=%d\n", __FUNCTION__, rc);
	return rc;
}
EXPORT_SYMBOL_GPL(rpaphp_config_pci_adapter);

static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
{
	eeh_remove_device(dev);
	if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
		struct pci_bus *bus = dev->subordinate;
		struct list_head *ln;
		if (!bus)
			return; 
		for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
			struct pci_dev *pdev = pci_dev_b(ln);
			if (pdev)
				rpaphp_eeh_remove_bus_device(pdev);
		}

	}
	return;
}

int rpaphp_unconfig_pci_adapter(struct pci_bus *bus)
{
	struct pci_dev *dev, *tmp;

	list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
		rpaphp_eeh_remove_bus_device(dev);
		pci_remove_bus_device(dev);
	}
	return 0;
}
EXPORT_SYMBOL_GPL(rpaphp_unconfig_pci_adapter);

static int setup_pci_hotplug_slot_info(struct slot *slot)
{
	struct hotplug_slot_info *hotplug_slot_info = slot->hotplug_slot->info;

	dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
	    __FUNCTION__);
	rpaphp_get_power_status(slot, &hotplug_slot_info->power_status);
	rpaphp_get_pci_adapter_status(slot, 1,
				      &hotplug_slot_info->adapter_status);
	if (hotplug_slot_info->adapter_status == NOT_VALID) {
		err("%s: NOT_VALID: skip dn->full_name=%s\n",
		    __FUNCTION__, slot->dn->full_name);
		return -EINVAL;
	}
	return 0;
}

static void set_slot_name(struct slot *slot)
{
	struct pci_bus *bus = slot->bus;
	struct pci_dev *bridge;

	bridge = bus->self;
	if (bridge)
		strcpy(slot->name, pci_name(bridge));
	else
		sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus),
			bus->number);
}

static int setup_pci_slot(struct slot *slot)
{
	struct device_node *dn = slot->dn;
	struct pci_bus *bus;

	BUG_ON(!dn);
	bus = pcibios_find_pci_bus(dn);
	if (!bus) {
		err("%s: no pci_bus for dn %s\n", __FUNCTION__, dn->full_name);
		goto exit_rc;
	}

	slot->bus = bus;
	slot->pci_devs = &bus->devices;
	set_slot_name(slot);

	/* find slot's pci_dev if it's not empty */
	if (slot->hotplug_slot->info->adapter_status == EMPTY) {
		slot->state = EMPTY;	/* slot is empty */
	} else {
		/* slot is occupied */
		if (!dn->child) {
			/* non-empty slot has to have child */
			err("%s: slot[%s]'s device_node doesn't have child for adapter\n", 
				__FUNCTION__, slot->name);
			goto exit_rc;
		}

		if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
			dbg("%s CONFIGURING pci adapter in slot[%s]\n",  
				__FUNCTION__, slot->name);
			if (rpaphp_config_pci_adapter(slot->bus)) {
				err("%s: CONFIG pci adapter failed\n", __FUNCTION__);
				goto exit_rc;		
			}

		} else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) {
			err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
				__FUNCTION__, slot->name);
			goto exit_rc;
		}
		print_slot_pci_funcs(slot->bus);
		if (!list_empty(slot->pci_devs)) {
			slot->state = CONFIGURED;
		} else {
			/* DLPAR add as opposed to 
		 	 * boot time */
			slot->state = NOT_CONFIGURED;
		}
	}
	return 0;
exit_rc:
	dealloc_slot_struct(slot);
	return -EINVAL;
}

int register_pci_slot(struct slot *slot)
{
	int rc = -EINVAL;

	if (setup_pci_hotplug_slot_info(slot))
		goto exit_rc;
	if (setup_pci_slot(slot))
		goto exit_rc;
	rc = register_slot(slot);
exit_rc:
	return rc;
}

int rpaphp_enable_pci_slot(struct slot *slot)
{
	int retval = 0, state;

	retval = rpaphp_get_sensor_state(slot, &state);
	if (retval)
		goto exit;
	dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
	/* if slot is not empty, enable the adapter */
	if (state == PRESENT) {
		dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
		retval = rpaphp_config_pci_adapter(slot->bus);
		if (!retval) {
			slot->state = CONFIGURED;
			info("%s: devices in slot[%s] configured\n",
					__FUNCTION__, slot->name);
		} else {
			slot->state = NOT_CONFIGURED;
			dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
			    __FUNCTION__, slot->name);
		}
	} else if (state == EMPTY) {
		dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
		slot->state = EMPTY;
	} else {
		err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
		    slot->name);
		slot->state = NOT_VALID;
		retval = -EINVAL;
	}
exit:
	dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
	return retval;
}