xref: /linux/drivers/pci/hotplug/rpaphp_core.c (revision 14b42963f64b98ab61fa9723c03d71aa5ef4f862)
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/kernel.h>
26 #include <linux/module.h>
27 #include <linux/moduleparam.h>
28 #include <linux/pci.h>
29 #include <linux/slab.h>
30 #include <linux/smp.h>
31 #include <linux/smp_lock.h>
32 #include <linux/init.h>
33 #include <asm/eeh.h>       /* for eeh_add_device() */
34 #include <asm/rtas.h>		/* rtas_call */
35 #include <asm/pci-bridge.h>	/* for pci_controller */
36 #include "../pci.h"		/* for pci_add_new_bus */
37 				/* and pci_do_scan_bus */
38 #include "rpaphp.h"
39 #include "pci_hotplug.h"
40 
41 int debug;
42 static struct semaphore rpaphp_sem;
43 LIST_HEAD(rpaphp_slot_head);
44 int num_slots;
45 
46 #define DRIVER_VERSION	"0.1"
47 #define DRIVER_AUTHOR	"Linda Xie <lxie@us.ibm.com>"
48 #define DRIVER_DESC	"RPA HOT Plug PCI Controller Driver"
49 
50 #define MAX_LOC_CODE 128
51 
52 MODULE_AUTHOR(DRIVER_AUTHOR);
53 MODULE_DESCRIPTION(DRIVER_DESC);
54 MODULE_LICENSE("GPL");
55 
56 module_param(debug, bool, 0644);
57 
58 static int rpaphp_get_attention_status(struct slot *slot)
59 {
60 	return slot->hotplug_slot->info->attention_status;
61 }
62 
63 /**
64  * set_attention_status - set attention LED
65  * echo 0 > attention -- set LED OFF
66  * echo 1 > attention -- set LED ON
67  * echo 2 > attention -- set LED ID(identify, light is blinking)
68  *
69  */
70 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
71 {
72 	int retval = 0;
73 	struct slot *slot = (struct slot *)hotplug_slot->private;
74 
75 	down(&rpaphp_sem);
76 	switch (value) {
77 	case 0:
78 		retval = rpaphp_set_attention_status(slot, LED_OFF);
79 		hotplug_slot->info->attention_status = 0;
80 		break;
81 	case 1:
82 	default:
83 		retval = rpaphp_set_attention_status(slot, LED_ON);
84 		hotplug_slot->info->attention_status = 1;
85 		break;
86 	case 2:
87 		retval = rpaphp_set_attention_status(slot, LED_ID);
88 		hotplug_slot->info->attention_status = 2;
89 		break;
90 	}
91 	up(&rpaphp_sem);
92 	return retval;
93 }
94 
95 /**
96  * get_power_status - get power status of a slot
97  * @hotplug_slot: slot to get status
98  * @value: pointer to store status
99  *
100  *
101  */
102 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 * value)
103 {
104 	int retval;
105 	struct slot *slot = (struct slot *)hotplug_slot->private;
106 
107 	down(&rpaphp_sem);
108 	retval = rpaphp_get_power_status(slot, value);
109 	up(&rpaphp_sem);
110 	return retval;
111 }
112 
113 /**
114  * get_attention_status - get attention LED status
115  *
116  *
117  */
118 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
119 {
120 	int retval = 0;
121 	struct slot *slot = (struct slot *)hotplug_slot->private;
122 
123 	down(&rpaphp_sem);
124 	*value = rpaphp_get_attention_status(slot);
125 	up(&rpaphp_sem);
126 	return retval;
127 }
128 
129 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value)
130 {
131 	struct slot *slot = (struct slot *)hotplug_slot->private;
132 	int retval = 0;
133 
134 	down(&rpaphp_sem);
135 	retval = rpaphp_get_pci_adapter_status(slot, 0, value);
136 	up(&rpaphp_sem);
137 	return retval;
138 }
139 
140 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
141 {
142 	struct slot *slot = (struct slot *)hotplug_slot->private;
143 
144 	down(&rpaphp_sem);
145 	switch (slot->type) {
146 	case 1:
147 	case 2:
148 	case 3:
149 	case 4:
150 	case 5:
151 	case 6:
152 		*value = PCI_SPEED_33MHz;	/* speed for case 1-6 */
153 		break;
154 	case 7:
155 	case 8:
156 		*value = PCI_SPEED_66MHz;
157 		break;
158 	case 11:
159 	case 14:
160 		*value = PCI_SPEED_66MHz_PCIX;
161 		break;
162 	case 12:
163 	case 15:
164 		*value = PCI_SPEED_100MHz_PCIX;
165 		break;
166 	case 13:
167 	case 16:
168 		*value = PCI_SPEED_133MHz_PCIX;
169 		break;
170 	default:
171 		*value = PCI_SPEED_UNKNOWN;
172 		break;
173 
174 	}
175 	up(&rpaphp_sem);
176 	return 0;
177 }
178 
179 static int get_children_props(struct device_node *dn, int **drc_indexes,
180 		int **drc_names, int **drc_types, int **drc_power_domains)
181 {
182 	int *indexes, *names;
183 	int *types, *domains;
184 
185 	indexes = (int *) get_property(dn, "ibm,drc-indexes", NULL);
186 	names = (int *) get_property(dn, "ibm,drc-names", NULL);
187 	types = (int *) get_property(dn, "ibm,drc-types", NULL);
188 	domains = (int *) get_property(dn, "ibm,drc-power-domains", NULL);
189 
190 	if (!indexes || !names || !types || !domains) {
191 		/* Slot does not have dynamically-removable children */
192 		return -EINVAL;
193 	}
194 	if (drc_indexes)
195 		*drc_indexes = indexes;
196 	if (drc_names)
197 		/* &drc_names[1] contains NULL terminated slot names */
198 		*drc_names = names;
199 	if (drc_types)
200 		/* &drc_types[1] contains NULL terminated slot types */
201 		*drc_types = types;
202 	if (drc_power_domains)
203 		*drc_power_domains = domains;
204 
205 	return 0;
206 }
207 
208 /* To get the DRC props describing the current node, first obtain it's
209  * my-drc-index property.  Next obtain the DRC list from it's parent.  Use
210  * the my-drc-index for correlation, and obtain the requested properties.
211  */
212 int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
213 		char **drc_name, char **drc_type, int *drc_power_domain)
214 {
215 	int *indexes, *names;
216 	int *types, *domains;
217 	unsigned int *my_index;
218 	char *name_tmp, *type_tmp;
219 	int i, rc;
220 
221 	my_index = (int *) get_property(dn, "ibm,my-drc-index", NULL);
222 	if (!my_index) {
223 		/* Node isn't DLPAR/hotplug capable */
224 		return -EINVAL;
225 	}
226 
227 	rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
228 	if (rc < 0) {
229 		return -EINVAL;
230 	}
231 
232 	name_tmp = (char *) &names[1];
233 	type_tmp = (char *) &types[1];
234 
235 	/* Iterate through parent properties, looking for my-drc-index */
236 	for (i = 0; i < indexes[0]; i++) {
237 		if ((unsigned int) indexes[i + 1] == *my_index) {
238 			if (drc_name)
239                 		*drc_name = name_tmp;
240 			if (drc_type)
241 				*drc_type = type_tmp;
242 			if (drc_index)
243 				*drc_index = *my_index;
244 			if (drc_power_domain)
245 				*drc_power_domain = domains[i+1];
246 			return 0;
247 		}
248 		name_tmp += (strlen(name_tmp) + 1);
249 		type_tmp += (strlen(type_tmp) + 1);
250 	}
251 
252 	return -EINVAL;
253 }
254 
255 static int is_php_type(char *drc_type)
256 {
257 	unsigned long value;
258 	char *endptr;
259 
260 	/* PCI Hotplug nodes have an integer for drc_type */
261 	value = simple_strtoul(drc_type, &endptr, 10);
262 	if (endptr == drc_type)
263 		return 0;
264 
265 	return 1;
266 }
267 
268 static int is_php_dn(struct device_node *dn, int **indexes, int **names,
269 		int **types, int **power_domains)
270 {
271 	int *drc_types;
272 	int rc;
273 
274 	rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
275 	if (rc >= 0) {
276 		if (is_php_type((char *) &drc_types[1])) {
277 			*types = drc_types;
278 			return 1;
279 		}
280 	}
281 
282 	return 0;
283 }
284 
285 /**
286  * rpaphp_add_slot -- add hotplug or dlpar slot
287  *
288  *	rpaphp not only registers PCI hotplug slots(HOTPLUG),
289  *	but also logical DR slots(EMBEDDED).
290  *	HOTPLUG slot: An adapter can be physically added/removed.
291  *	EMBEDDED slot: An adapter can be logically removed/added
292  *		  from/to a partition with the slot.
293  */
294 int rpaphp_add_slot(struct device_node *dn)
295 {
296 	struct slot *slot;
297 	int retval = 0;
298 	int i;
299 	int *indexes, *names, *types, *power_domains;
300 	char *name, *type;
301 
302 	dbg("Entry %s: dn->full_name=%s\n", __FUNCTION__, dn->full_name);
303 
304 	/* register PCI devices */
305 	if (dn->name != 0 && strcmp(dn->name, "pci") == 0) {
306 		if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
307 			goto exit;
308 
309 		name = (char *) &names[1];
310 		type = (char *) &types[1];
311 		for (i = 0; i < indexes[0]; i++,
312 	     		name += (strlen(name) + 1), type += (strlen(type) + 1)) 		{
313 
314 			if (!(slot = alloc_slot_struct(dn, indexes[i + 1], name,
315 				       power_domains[i + 1]))) {
316 				retval = -ENOMEM;
317 				goto exit;
318 			}
319 			slot->type = simple_strtoul(type, NULL, 10);
320 
321 			dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
322 					indexes[i + 1], name, type);
323 
324 			retval = rpaphp_register_pci_slot(slot);
325 		}
326 	}
327 exit:
328 	dbg("%s - Exit: num_slots=%d rc[%d]\n",
329 	    __FUNCTION__, num_slots, retval);
330 	return retval;
331 }
332 
333 static void __exit cleanup_slots(void)
334 {
335 	struct list_head *tmp, *n;
336 	struct slot *slot;
337 
338 	/*
339 	 * Unregister all of our slots with the pci_hotplug subsystem,
340 	 * and free up all memory that we had allocated.
341 	 * memory will be freed in release_slot callback.
342 	 */
343 
344 	list_for_each_safe(tmp, n, &rpaphp_slot_head) {
345 		slot = list_entry(tmp, struct slot, rpaphp_slot_list);
346 		list_del(&slot->rpaphp_slot_list);
347 		pci_hp_deregister(slot->hotplug_slot);
348 	}
349 	return;
350 }
351 
352 static int __init rpaphp_init(void)
353 {
354 	struct device_node *dn = NULL;
355 
356 	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
357 	init_MUTEX(&rpaphp_sem);
358 
359 	while ((dn = of_find_node_by_type(dn, "pci")))
360 		rpaphp_add_slot(dn);
361 
362 	return 0;
363 }
364 
365 static void __exit rpaphp_exit(void)
366 {
367 	cleanup_slots();
368 }
369 
370 static int __enable_slot(struct slot *slot)
371 {
372 	int state;
373 	int retval;
374 
375 	if (slot->state == CONFIGURED)
376 		return 0;
377 
378 	retval = rpaphp_get_sensor_state(slot, &state);
379 	if (retval)
380 		return retval;
381 
382 	if (state == PRESENT) {
383 		pcibios_add_pci_devices(slot->bus);
384 		slot->state = CONFIGURED;
385 	} else if (state == EMPTY) {
386 		slot->state = EMPTY;
387 	} else {
388 		err("%s: slot[%s] is in invalid state\n", __FUNCTION__, slot->name);
389 		slot->state = NOT_VALID;
390 		return -EINVAL;
391 	}
392 	return 0;
393 }
394 
395 static int enable_slot(struct hotplug_slot *hotplug_slot)
396 {
397 	int retval;
398 	struct slot *slot = (struct slot *)hotplug_slot->private;
399 
400 	down(&rpaphp_sem);
401 	retval = __enable_slot(slot);
402 	up(&rpaphp_sem);
403 
404 	return retval;
405 }
406 
407 static int __disable_slot(struct slot *slot)
408 {
409 	struct pci_dev *dev, *tmp;
410 
411 	if (slot->state == NOT_CONFIGURED)
412 		return -EINVAL;
413 
414 	list_for_each_entry_safe(dev, tmp, &slot->bus->devices, bus_list) {
415 		eeh_remove_bus_device(dev);
416 		pci_remove_bus_device(dev);
417 	}
418 
419 	slot->state = NOT_CONFIGURED;
420 	return 0;
421 }
422 
423 static int disable_slot(struct hotplug_slot *hotplug_slot)
424 {
425 	struct slot *slot = (struct slot *)hotplug_slot->private;
426 	int retval;
427 
428 	down(&rpaphp_sem);
429 	retval = __disable_slot (slot);
430 	up(&rpaphp_sem);
431 
432 	return retval;
433 }
434 
435 struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
436 	.owner = THIS_MODULE,
437 	.enable_slot = enable_slot,
438 	.disable_slot = disable_slot,
439 	.set_attention_status = set_attention_status,
440 	.get_power_status = get_power_status,
441 	.get_attention_status = get_attention_status,
442 	.get_adapter_status = get_adapter_status,
443 	.get_max_bus_speed = get_max_bus_speed,
444 };
445 
446 module_init(rpaphp_init);
447 module_exit(rpaphp_exit);
448 
449 EXPORT_SYMBOL_GPL(rpaphp_add_slot);
450 EXPORT_SYMBOL_GPL(rpaphp_slot_head);
451 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);
452