2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2005 Silicon Graphics, Inc. All rights reserved.
8 * This work was based on the 2.4/2.6 kernel development by Dick Reigner.
9 * Work to add BIOS PROM support was completed by Mike Habeck.
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/pci.h>
16 #include <linux/proc_fs.h>
17 #include <linux/types.h>
19 #include <asm/sn/addrs.h>
20 #include <asm/sn/l1.h>
21 #include <asm/sn/module.h>
22 #include <asm/sn/pcibr_provider.h>
23 #include <asm/sn/pcibus_provider_defs.h>
24 #include <asm/sn/pcidev.h>
25 #include <asm/sn/sn_sal.h>
26 #include <asm/sn/types.h>
29 #include "pci_hotplug.h"
31 MODULE_LICENSE("GPL");
32 MODULE_AUTHOR("SGI (prarit@sgi.com, dickie@sgi.com, habeck@sgi.com)");
33 MODULE_DESCRIPTION("SGI Altix Hot Plug PCI Controller Driver");
35 #define PCIIO_ASIC_TYPE_TIOCA 4
36 #define PCI_SLOT_ALREADY_UP 2 /* slot already up */
37 #define PCI_SLOT_ALREADY_DOWN 3 /* slot already down */
38 #define PCI_L1_ERR 7 /* L1 console command error */
39 #define PCI_EMPTY_33MHZ 15 /* empty 33 MHz bus */
40 #define PCI_L1_QSIZE 128 /* our L1 message buffer size */
41 #define SN_MAX_HP_SLOTS 32 /* max hotplug slots */
42 #define SGI_HOTPLUG_PROM_REV 0x0430 /* Min. required PROM version */
43 #define SN_SLOT_NAME_SIZE 33 /* size of name string */
45 /* internal list head */
46 static struct list_head sn_hp_list;
48 /* hotplug_slot struct's private pointer */
51 struct pci_bus *pci_bus;
52 /* this struct for glue internal only */
53 struct hotplug_slot *hotplug_slot;
54 struct list_head hp_list;
55 char physical_path[SN_SLOT_NAME_SIZE];
58 struct pcibr_slot_enable_resp {
60 char resp_l1_msg[PCI_L1_QSIZE + 1];
63 struct pcibr_slot_disable_resp {
65 char resp_l1_msg[PCI_L1_QSIZE + 1];
69 PCI_REQ_SLOT_ELIGIBLE,
73 static int enable_slot(struct hotplug_slot *slot);
74 static int disable_slot(struct hotplug_slot *slot);
75 static inline int get_power_status(struct hotplug_slot *slot, u8 *value);
77 static struct hotplug_slot_ops sn_hotplug_slot_ops = {
79 .enable_slot = enable_slot,
80 .disable_slot = disable_slot,
81 .get_power_status = get_power_status,
84 static DECLARE_MUTEX(sn_hotplug_sem);
86 static ssize_t path_show (struct hotplug_slot *bss_hotplug_slot,
90 struct slot *slot = bss_hotplug_slot->private;
95 retval = sprintf (buf, "%s\n", slot->physical_path);
99 static struct hotplug_slot_attribute sn_slot_path_attr = __ATTR_RO(path);
101 static int sn_pci_slot_valid(struct pci_bus *pci_bus, int device)
103 struct pcibus_info *pcibus_info;
107 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
109 /* Check to see if this is a valid slot on 'pci_bus' */
110 if (!(pcibus_info->pbi_valid_devices & (1 << device)))
113 bricktype = MODULE_GET_BTYPE(pcibus_info->pbi_moduleid);
114 bus_num = pcibus_info->pbi_buscommon.bs_persist_busnum & 0xf;
116 /* Do not allow hotplug operations on base I/O cards */
117 if ((bricktype == L1_BRICKTYPE_IX || bricktype == L1_BRICKTYPE_IA) &&
118 (bus_num == 1 && device != 1))
124 static int sn_pci_bus_valid(struct pci_bus *pci_bus)
126 struct pcibus_info *pcibus_info;
130 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
132 /* Don't register slots hanging off the TIOCA bus */
133 asic_type = pcibus_info->pbi_buscommon.bs_asic_type;
134 if (asic_type == PCIIO_ASIC_TYPE_TIOCA)
137 /* Only register slots in I/O Bricks that support hotplug */
138 bricktype = MODULE_GET_BTYPE(pcibus_info->pbi_moduleid);
140 case L1_BRICKTYPE_IX:
141 case L1_BRICKTYPE_PX:
142 case L1_BRICKTYPE_IA:
143 case L1_BRICKTYPE_PA:
154 static int sn_hp_slot_private_alloc(struct hotplug_slot *bss_hotplug_slot,
155 struct pci_bus *pci_bus, int device)
157 struct pcibus_info *pcibus_info;
160 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
162 slot = kcalloc(1, sizeof(*slot), GFP_KERNEL);
165 bss_hotplug_slot->private = slot;
167 bss_hotplug_slot->name = kmalloc(SN_SLOT_NAME_SIZE, GFP_KERNEL);
168 if (!bss_hotplug_slot->name) {
169 kfree(bss_hotplug_slot->private);
173 slot->device_num = device;
174 slot->pci_bus = pci_bus;
175 sprintf(bss_hotplug_slot->name, "%04x:%02x:%02x",
176 pci_domain_nr(pci_bus),
177 ((int)pcibus_info->pbi_buscommon.bs_persist_busnum) & 0xf,
179 sprintf(slot->physical_path, "module_%c%c%c%c%.2d",
180 '0'+RACK_GET_CLASS(MODULE_GET_RACK(pcibus_info->pbi_moduleid)),
181 '0'+RACK_GET_GROUP(MODULE_GET_RACK(pcibus_info->pbi_moduleid)),
182 '0'+RACK_GET_NUM(MODULE_GET_RACK(pcibus_info->pbi_moduleid)),
183 MODULE_GET_BTCHAR(pcibus_info->pbi_moduleid),
184 MODULE_GET_BPOS(pcibus_info->pbi_moduleid));
185 slot->hotplug_slot = bss_hotplug_slot;
186 list_add(&slot->hp_list, &sn_hp_list);
191 static struct hotplug_slot * sn_hp_destroy(void)
194 struct hotplug_slot *bss_hotplug_slot = NULL;
196 list_for_each_entry(slot, &sn_hp_list, hp_list) {
197 bss_hotplug_slot = slot->hotplug_slot;
198 list_del(&((struct slot *)bss_hotplug_slot->private)->
200 sysfs_remove_file(&bss_hotplug_slot->kobj,
201 &sn_slot_path_attr.attr);
204 return bss_hotplug_slot;
207 static void sn_bus_alloc_data(struct pci_dev *dev)
209 struct pci_bus *subordinate_bus;
210 struct pci_dev *child;
212 sn_pci_fixup_slot(dev);
214 /* Recursively sets up the sn_irq_info structs */
215 if (dev->subordinate) {
216 subordinate_bus = dev->subordinate;
217 list_for_each_entry(child, &subordinate_bus->devices, bus_list)
218 sn_bus_alloc_data(child);
222 static void sn_bus_free_data(struct pci_dev *dev)
224 struct pci_bus *subordinate_bus;
225 struct pci_dev *child;
227 /* Recursively clean up sn_irq_info structs */
228 if (dev->subordinate) {
229 subordinate_bus = dev->subordinate;
230 list_for_each_entry(child, &subordinate_bus->devices, bus_list)
231 sn_bus_free_data(child);
233 sn_pci_unfixup_slot(dev);
236 static int sn_slot_enable(struct hotplug_slot *bss_hotplug_slot,
239 struct slot *slot = bss_hotplug_slot->private;
240 struct pcibus_info *pcibus_info;
241 struct pcibr_slot_enable_resp resp;
244 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
247 * Power-on and initialize the slot in the SN
248 * PCI infrastructure.
250 rc = sal_pcibr_slot_enable(pcibus_info, device_num, &resp);
252 if (rc == PCI_SLOT_ALREADY_UP) {
253 dev_dbg(slot->pci_bus->self, "is already active\n");
254 return 1; /* return 1 to user */
257 if (rc == PCI_L1_ERR) {
258 dev_dbg(slot->pci_bus->self,
259 "L1 failure %d with message: %s",
260 resp.resp_sub_errno, resp.resp_l1_msg);
265 dev_dbg(slot->pci_bus->self,
266 "insert failed with error %d sub-error %d\n",
267 rc, resp.resp_sub_errno);
271 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
272 pcibus_info->pbi_enabled_devices |= (1 << device_num);
277 static int sn_slot_disable(struct hotplug_slot *bss_hotplug_slot,
278 int device_num, int action)
280 struct slot *slot = bss_hotplug_slot->private;
281 struct pcibus_info *pcibus_info;
282 struct pcibr_slot_disable_resp resp;
285 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
287 rc = sal_pcibr_slot_disable(pcibus_info, device_num, action, &resp);
289 if ((action == PCI_REQ_SLOT_ELIGIBLE) &&
290 (rc == PCI_SLOT_ALREADY_DOWN)) {
291 dev_dbg(slot->pci_bus->self, "Slot %s already inactive\n");
292 return 1; /* return 1 to user */
295 if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_EMPTY_33MHZ)) {
296 dev_dbg(slot->pci_bus->self,
297 "Cannot remove last 33MHz card\n");
301 if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_L1_ERR)) {
302 dev_dbg(slot->pci_bus->self,
303 "L1 failure %d with message \n%s\n",
304 resp.resp_sub_errno, resp.resp_l1_msg);
308 if ((action == PCI_REQ_SLOT_ELIGIBLE) && rc) {
309 dev_dbg(slot->pci_bus->self,
310 "remove failed with error %d sub-error %d\n",
311 rc, resp.resp_sub_errno);
315 if ((action == PCI_REQ_SLOT_ELIGIBLE) && !rc)
318 if ((action == PCI_REQ_SLOT_DISABLE) && !rc) {
319 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
320 pcibus_info->pbi_enabled_devices &= ~(1 << device_num);
321 dev_dbg(slot->pci_bus->self, "remove successful\n");
325 if ((action == PCI_REQ_SLOT_DISABLE) && rc) {
326 dev_dbg(slot->pci_bus->self,"remove failed rc = %d\n", rc);
332 static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
334 struct slot *slot = bss_hotplug_slot->private;
335 struct pci_bus *new_bus = NULL;
341 /* Serialize the Linux PCI infrastructure */
342 down(&sn_hotplug_sem);
345 * Power-on and initialize the slot in the SN
346 * PCI infrastructure.
348 rc = sn_slot_enable(bss_hotplug_slot, slot->device_num);
354 num_funcs = pci_scan_slot(slot->pci_bus,
355 PCI_DEVFN(slot->device_num + 1, 0));
357 dev_dbg(slot->pci_bus->self, "no device in slot\n");
362 sn_pci_controller_fixup(pci_domain_nr(slot->pci_bus),
363 slot->pci_bus->number,
366 * Map SN resources for all functions on the card
367 * to the Linux PCI interface and tell the drivers
370 for (func = 0; func < num_funcs; func++) {
371 dev = pci_get_slot(slot->pci_bus,
372 PCI_DEVFN(slot->device_num + 1,
375 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
376 unsigned char sec_bus;
377 pci_read_config_byte(dev, PCI_SECONDARY_BUS,
379 new_bus = pci_add_new_bus(dev->bus, dev,
381 pci_scan_child_bus(new_bus);
382 sn_pci_controller_fixup(pci_domain_nr(new_bus),
387 sn_bus_alloc_data(dev);
392 /* Call the driver for the new device */
393 pci_bus_add_devices(slot->pci_bus);
394 /* Call the drivers for the new devices subordinate to PPB */
396 pci_bus_add_devices(new_bus);
401 dev_dbg(slot->pci_bus->self,
402 "insert operation successful\n");
404 dev_dbg(slot->pci_bus->self,
405 "insert operation failed rc = %d\n", rc);
410 static int disable_slot(struct hotplug_slot *bss_hotplug_slot)
412 struct slot *slot = bss_hotplug_slot->private;
417 /* Acquire update access to the bus */
418 down(&sn_hotplug_sem);
420 /* is it okay to bring this slot down? */
421 rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
422 PCI_REQ_SLOT_ELIGIBLE);
426 /* Free the SN resources assigned to the Linux device.*/
427 for (func = 0; func < 8; func++) {
428 dev = pci_get_slot(slot->pci_bus,
429 PCI_DEVFN(slot->device_num + 1,
433 * Some drivers may use dma accesses during the
434 * driver remove function. We release the sysdata
435 * areas after the driver remove functions have
438 sn_bus_store_sysdata(dev);
439 sn_bus_free_data(dev);
440 pci_remove_bus_device(dev);
445 /* free the collected sysdata pointers */
446 sn_bus_free_sysdata();
448 /* Deactivate slot */
449 rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
450 PCI_REQ_SLOT_DISABLE);
452 /* Release the bus lock */
458 static inline int get_power_status(struct hotplug_slot *bss_hotplug_slot,
461 struct slot *slot = bss_hotplug_slot->private;
462 struct pcibus_info *pcibus_info;
464 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
465 down(&sn_hotplug_sem);
466 *value = pcibus_info->pbi_enabled_devices & (1 << slot->device_num);
471 static void sn_release_slot(struct hotplug_slot *bss_hotplug_slot)
473 kfree(bss_hotplug_slot->info);
474 kfree(bss_hotplug_slot->name);
475 kfree(bss_hotplug_slot->private);
476 kfree(bss_hotplug_slot);
479 static int sn_hotplug_slot_register(struct pci_bus *pci_bus)
482 struct hotplug_slot *bss_hotplug_slot;
486 * Currently only four devices are supported,
487 * in the future there maybe more -- up to 32.
490 for (device = 0; device < SN_MAX_HP_SLOTS ; device++) {
491 if (sn_pci_slot_valid(pci_bus, device) != 1)
494 bss_hotplug_slot = kcalloc(1, sizeof(*bss_hotplug_slot),
496 if (!bss_hotplug_slot) {
501 bss_hotplug_slot->info =
502 kcalloc(1, sizeof(struct hotplug_slot_info),
504 if (!bss_hotplug_slot->info) {
509 if (sn_hp_slot_private_alloc(bss_hotplug_slot,
515 bss_hotplug_slot->ops = &sn_hotplug_slot_ops;
516 bss_hotplug_slot->release = &sn_release_slot;
518 rc = pci_hp_register(bss_hotplug_slot);
522 rc = sysfs_create_file(&bss_hotplug_slot->kobj,
523 &sn_slot_path_attr.attr);
527 dev_dbg(pci_bus->self, "Registered bus with hotplug\n");
531 dev_dbg(pci_bus->self, "bus failed to register with err = %d\n",
536 dev_dbg(pci_bus->self, "Memory allocation error\n");
538 /* destroy THIS element */
539 if (bss_hotplug_slot)
540 sn_release_slot(bss_hotplug_slot);
542 /* destroy anything else on the list */
543 while ((bss_hotplug_slot = sn_hp_destroy()))
544 pci_hp_deregister(bss_hotplug_slot);
549 static int sn_pci_hotplug_init(void)
551 struct pci_bus *pci_bus = NULL;
555 if (sn_sal_rev() < SGI_HOTPLUG_PROM_REV) {
556 printk(KERN_ERR "%s: PROM version must be greater than 4.30\n",
561 INIT_LIST_HEAD(&sn_hp_list);
563 while ((pci_bus = pci_find_next_bus(pci_bus))) {
564 if (!pci_bus->sysdata)
567 rc = sn_pci_bus_valid(pci_bus);
569 dev_dbg(pci_bus->self, "not a valid hotplug bus\n");
572 dev_dbg(pci_bus->self, "valid hotplug bus\n");
574 rc = sn_hotplug_slot_register(pci_bus);
583 return registered == 1 ? 0 : -ENODEV;
586 static void sn_pci_hotplug_exit(void)
588 struct hotplug_slot *bss_hotplug_slot;
590 while ((bss_hotplug_slot = sn_hp_destroy()))
591 pci_hp_deregister(bss_hotplug_slot);
593 if (!list_empty(&sn_hp_list))
594 printk(KERN_ERR "%s: internal list is not empty\n", __FILE__);
597 module_init(sn_pci_hotplug_init);
598 module_exit(sn_pci_hotplug_exit);