blob: 0e90c5d4bb2b8e1839f82245a3f01c4e7dd354cc [file] [log] [blame]
Thomas Gleixner2874c5f2019-05-27 08:55:01 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Matt Portereb188d02005-11-07 01:00:17 -08002/*
3 * RapidIO enumeration and discovery support
4 *
5 * Copyright 2005 MontaVista Software, Inc.
6 * Matt Porter <mporter@kernel.crashing.org>
7 *
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -07008 * Copyright 2009 Integrated Device Technology, Inc.
9 * Alex Bounine <alexandre.bounine@idt.com>
10 * - Added Port-Write/Error Management initialization and handling
11 *
Thomas Moll933af4a2010-05-26 14:44:01 -070012 * Copyright 2009 Sysgo AG
13 * Thomas Moll <thomas.moll@sysgo.com>
14 * - Added Input- Output- enable functionality, to allow full communication
Matt Portereb188d02005-11-07 01:00:17 -080015 */
16
Matt Portereb188d02005-11-07 01:00:17 -080017#include <linux/types.h>
18#include <linux/kernel.h>
19
20#include <linux/delay.h>
Matt Porterfa78cc52005-11-07 01:00:18 -080021#include <linux/dma-mapping.h>
Matt Portereb188d02005-11-07 01:00:17 -080022#include <linux/init.h>
23#include <linux/rio.h>
24#include <linux/rio_drv.h>
25#include <linux/rio_ids.h>
26#include <linux/rio_regs.h>
27#include <linux/module.h>
28#include <linux/spinlock.h>
29#include <linux/timer.h>
Alexandre Bouninefa3dbaa2012-10-04 17:16:04 -070030#include <linux/sched.h>
Tim Schmielaude259682006-01-08 01:02:05 -080031#include <linux/jiffies.h>
32#include <linux/slab.h>
Matt Portereb188d02005-11-07 01:00:17 -080033
34#include "rio.h"
35
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -070036static void rio_init_em(struct rio_dev *rdev);
37
Alexandre Bouninee6b585c2016-03-22 14:26:17 -070038struct rio_id_table {
39 u16 start; /* logical minimal id */
40 u32 max; /* max number of IDs in table */
41 spinlock_t lock;
42 unsigned long table[0];
43};
44
Matt Portereb188d02005-11-07 01:00:17 -080045static int next_destid = 0;
Alexandre Bounineaf84ca32010-10-27 15:34:34 -070046static int next_comptag = 1;
Matt Portereb188d02005-11-07 01:00:17 -080047
Alexandre Bounine4ed134b2012-10-10 15:54:01 -070048/**
Alexandre Bouninede74e002012-10-04 17:16:13 -070049 * rio_destid_alloc - Allocate next available destID for given network
Alexandre Bounine4ed134b2012-10-10 15:54:01 -070050 * @net: RIO network
Alexandre Bouninede74e002012-10-04 17:16:13 -070051 *
52 * Returns next available device destination ID for the specified RIO network.
53 * Marks allocated ID as one in use.
54 * Returns RIO_INVALID_DESTID if new destID is not available.
55 */
56static u16 rio_destid_alloc(struct rio_net *net)
57{
58 int destid;
Alexandre Bouninee6b585c2016-03-22 14:26:17 -070059 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
Alexandre Bouninede74e002012-10-04 17:16:13 -070060
61 spin_lock(&idtab->lock);
Alexandre Bounine4ed134b2012-10-10 15:54:01 -070062 destid = find_first_zero_bit(idtab->table, idtab->max);
Alexandre Bouninede74e002012-10-04 17:16:13 -070063
64 if (destid < idtab->max) {
Alexandre Bouninede74e002012-10-04 17:16:13 -070065 set_bit(destid, idtab->table);
66 destid += idtab->start;
67 } else
68 destid = RIO_INVALID_DESTID;
69
70 spin_unlock(&idtab->lock);
71 return (u16)destid;
72}
73
Alexandre Bounine4ed134b2012-10-10 15:54:01 -070074/**
Vasyl Gomonovychb94bb1f2018-04-10 16:35:06 -070075 * rio_destid_reserve - Reserve the specified destID
Alexandre Bounine4ed134b2012-10-10 15:54:01 -070076 * @net: RIO network
77 * @destid: destID to reserve
Alexandre Bouninede74e002012-10-04 17:16:13 -070078 *
79 * Tries to reserve the specified destID.
Masanari Iida76679282015-05-08 00:02:27 +090080 * Returns 0 if successful.
Alexandre Bouninede74e002012-10-04 17:16:13 -070081 */
82static int rio_destid_reserve(struct rio_net *net, u16 destid)
83{
84 int oldbit;
Alexandre Bouninee6b585c2016-03-22 14:26:17 -070085 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
Alexandre Bouninede74e002012-10-04 17:16:13 -070086
87 destid -= idtab->start;
88 spin_lock(&idtab->lock);
89 oldbit = test_and_set_bit(destid, idtab->table);
90 spin_unlock(&idtab->lock);
91 return oldbit;
92}
93
Alexandre Bounine4ed134b2012-10-10 15:54:01 -070094/**
Alexandre Bouninede74e002012-10-04 17:16:13 -070095 * rio_destid_free - free a previously allocated destID
Alexandre Bounine4ed134b2012-10-10 15:54:01 -070096 * @net: RIO network
97 * @destid: destID to free
Alexandre Bouninede74e002012-10-04 17:16:13 -070098 *
99 * Makes the specified destID available for use.
100 */
101static void rio_destid_free(struct rio_net *net, u16 destid)
102{
Alexandre Bouninee6b585c2016-03-22 14:26:17 -0700103 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
Alexandre Bouninede74e002012-10-04 17:16:13 -0700104
105 destid -= idtab->start;
106 spin_lock(&idtab->lock);
107 clear_bit(destid, idtab->table);
108 spin_unlock(&idtab->lock);
109}
110
Alexandre Bounine4ed134b2012-10-10 15:54:01 -0700111/**
Alexandre Bouninede74e002012-10-04 17:16:13 -0700112 * rio_destid_first - return first destID in use
Alexandre Bounine4ed134b2012-10-10 15:54:01 -0700113 * @net: RIO network
Alexandre Bouninede74e002012-10-04 17:16:13 -0700114 */
115static u16 rio_destid_first(struct rio_net *net)
116{
117 int destid;
Alexandre Bouninee6b585c2016-03-22 14:26:17 -0700118 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
Alexandre Bouninede74e002012-10-04 17:16:13 -0700119
120 spin_lock(&idtab->lock);
121 destid = find_first_bit(idtab->table, idtab->max);
122 if (destid >= idtab->max)
123 destid = RIO_INVALID_DESTID;
124 else
125 destid += idtab->start;
126 spin_unlock(&idtab->lock);
127 return (u16)destid;
128}
129
Alexandre Bounine4ed134b2012-10-10 15:54:01 -0700130/**
Alexandre Bouninede74e002012-10-04 17:16:13 -0700131 * rio_destid_next - return next destID in use
Alexandre Bounine4ed134b2012-10-10 15:54:01 -0700132 * @net: RIO network
133 * @from: destination ID from which search shall continue
Alexandre Bouninede74e002012-10-04 17:16:13 -0700134 */
135static u16 rio_destid_next(struct rio_net *net, u16 from)
136{
137 int destid;
Alexandre Bouninee6b585c2016-03-22 14:26:17 -0700138 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
Alexandre Bouninede74e002012-10-04 17:16:13 -0700139
140 spin_lock(&idtab->lock);
141 destid = find_next_bit(idtab->table, idtab->max, from);
142 if (destid >= idtab->max)
143 destid = RIO_INVALID_DESTID;
144 else
145 destid += idtab->start;
146 spin_unlock(&idtab->lock);
147 return (u16)destid;
148}
149
Matt Portereb188d02005-11-07 01:00:17 -0800150/**
151 * rio_get_device_id - Get the base/extended device id for a device
152 * @port: RIO master port
153 * @destid: Destination ID of device
154 * @hopcount: Hopcount to device
155 *
156 * Reads the base/extended device id from a device. Returns the
157 * 8/16-bit device ID.
158 */
159static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
160{
161 u32 result;
162
163 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
164
Zhang Weie0423232008-04-18 13:33:42 -0700165 return RIO_GET_DID(port->sys_size, result);
Matt Portereb188d02005-11-07 01:00:17 -0800166}
167
168/**
169 * rio_set_device_id - Set the base/extended device id for a device
170 * @port: RIO master port
171 * @destid: Destination ID of device
172 * @hopcount: Hopcount to device
173 * @did: Device ID value to be written
174 *
175 * Writes the base/extended device id from a device.
176 */
Matt Porterfa78cc52005-11-07 01:00:18 -0800177static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
Matt Portereb188d02005-11-07 01:00:17 -0800178{
179 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
Zhang Weie0423232008-04-18 13:33:42 -0700180 RIO_SET_DID(port->sys_size, did));
Matt Portereb188d02005-11-07 01:00:17 -0800181}
182
183/**
Matt Portereb188d02005-11-07 01:00:17 -0800184 * rio_clear_locks- Release all host locks and signal enumeration complete
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700185 * @net: RIO network to run on
Matt Portereb188d02005-11-07 01:00:17 -0800186 *
187 * Marks the component tag CSR on each device with the enumeration
188 * complete flag. When complete, it then release the host locks on
189 * each device. Returns 0 on success or %-EINVAL on failure.
190 */
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700191static int rio_clear_locks(struct rio_net *net)
Matt Portereb188d02005-11-07 01:00:17 -0800192{
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700193 struct rio_mport *port = net->hport;
Matt Portereb188d02005-11-07 01:00:17 -0800194 struct rio_dev *rdev;
195 u32 result;
196 int ret = 0;
197
Matt Portereb188d02005-11-07 01:00:17 -0800198 /* Release host device id locks */
199 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
200 port->host_deviceid);
201 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
202 if ((result & 0xffff) != 0xffff) {
203 printk(KERN_INFO
204 "RIO: badness when releasing host lock on master port, result %8.8x\n",
205 result);
206 ret = -EINVAL;
207 }
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700208 list_for_each_entry(rdev, &net->devices, net_list) {
Matt Portereb188d02005-11-07 01:00:17 -0800209 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
210 port->host_deviceid);
211 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
212 if ((result & 0xffff) != 0xffff) {
213 printk(KERN_INFO
214 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
215 rdev->vid, rdev->did);
216 ret = -EINVAL;
217 }
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700218
219 /* Mark device as discovered and enable master */
220 rio_read_config_32(rdev,
221 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
222 &result);
223 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
224 rio_write_config_32(rdev,
225 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
226 result);
Matt Portereb188d02005-11-07 01:00:17 -0800227 }
228
229 return ret;
230}
231
232/**
233 * rio_enum_host- Set host lock and initialize host destination ID
234 * @port: Master port to issue transaction
235 *
236 * Sets the local host master port lock and destination ID register
237 * with the host device ID value. The host device ID value is provided
238 * by the platform. Returns %0 on success or %-1 on failure.
239 */
240static int rio_enum_host(struct rio_mport *port)
241{
242 u32 result;
243
244 /* Set master port host device id lock */
245 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
246 port->host_deviceid);
247
248 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
249 if ((result & 0xffff) != port->host_deviceid)
250 return -1;
251
252 /* Set master port destid and init destid ctr */
253 rio_local_set_device_id(port, port->host_deviceid);
Matt Portereb188d02005-11-07 01:00:17 -0800254 return 0;
255}
256
257/**
258 * rio_device_has_destid- Test if a device contains a destination ID register
259 * @port: Master port to issue transaction
260 * @src_ops: RIO device source operations
261 * @dst_ops: RIO device destination operations
262 *
263 * Checks the provided @src_ops and @dst_ops for the necessary transaction
264 * capabilities that indicate whether or not a device will implement a
265 * destination ID register. Returns 1 if true or 0 if false.
266 */
267static int rio_device_has_destid(struct rio_mport *port, int src_ops,
268 int dst_ops)
269{
Matt Porterfa78cc52005-11-07 01:00:18 -0800270 u32 mask = RIO_OPS_READ | RIO_OPS_WRITE | RIO_OPS_ATOMIC_TST_SWP | RIO_OPS_ATOMIC_INC | RIO_OPS_ATOMIC_DEC | RIO_OPS_ATOMIC_SET | RIO_OPS_ATOMIC_CLR;
271
272 return !!((src_ops | dst_ops) & mask);
Matt Portereb188d02005-11-07 01:00:17 -0800273}
274
275/**
276 * rio_release_dev- Frees a RIO device struct
277 * @dev: LDM device associated with a RIO device struct
278 *
279 * Gets the RIO device struct associated a RIO device struct.
280 * The RIO device struct is freed.
281 */
282static void rio_release_dev(struct device *dev)
283{
284 struct rio_dev *rdev;
285
286 rdev = to_rio_dev(dev);
287 kfree(rdev);
288}
289
290/**
291 * rio_is_switch- Tests if a RIO device has switch capabilities
292 * @rdev: RIO device
293 *
294 * Gets the RIO device Processing Element Features register
295 * contents and tests for switch capabilities. Returns 1 if
296 * the device is a switch or 0 if it is not a switch.
297 * The RIO device struct is freed.
298 */
299static int rio_is_switch(struct rio_dev *rdev)
300{
301 if (rdev->pef & RIO_PEF_SWITCH)
302 return 1;
303 return 0;
304}
305
306/**
Matt Portereb188d02005-11-07 01:00:17 -0800307 * rio_setup_device- Allocates and sets up a RIO device
308 * @net: RIO network
309 * @port: Master port to send transactions
310 * @destid: Current destination ID
311 * @hopcount: Current hopcount
312 * @do_enum: Enumeration/Discovery mode flag
313 *
314 * Allocates a RIO device and configures fields based on configuration
315 * space contents. If device has a destination ID register, a destination
316 * ID is either assigned in enumeration mode or read from configuration
317 * space in discovery mode. If the device has switch capabilities, then
318 * a switch is allocated and configured appropriately. Returns a pointer
319 * to a RIO device on success or NULL on failure.
320 *
321 */
Bill Pemberton305c891e2012-11-19 13:23:25 -0500322static struct rio_dev *rio_setup_device(struct rio_net *net,
Matt Portereb188d02005-11-07 01:00:17 -0800323 struct rio_mport *port, u16 destid,
324 u8 hopcount, int do_enum)
325{
Yang Li5f28c522009-05-11 22:36:02 +0000326 int ret = 0;
Matt Portereb188d02005-11-07 01:00:17 -0800327 struct rio_dev *rdev;
Yang Li5f28c522009-05-11 22:36:02 +0000328 struct rio_switch *rswitch = NULL;
Matt Portereb188d02005-11-07 01:00:17 -0800329 int result, rdid;
Alexandre Bounineded05782011-01-12 17:00:39 -0800330 size_t size;
331 u32 swpinfo = 0;
Matt Portereb188d02005-11-07 01:00:17 -0800332
Alexandre Bounineded05782011-01-12 17:00:39 -0800333 size = sizeof(struct rio_dev);
334 if (rio_mport_read_config_32(port, destid, hopcount,
335 RIO_PEF_CAR, &result))
336 return NULL;
337
338 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
339 rio_mport_read_config_32(port, destid, hopcount,
340 RIO_SWP_INFO_CAR, &swpinfo);
341 if (result & RIO_PEF_SWITCH) {
342 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
343 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
344 }
345 }
346
347 rdev = kzalloc(size, GFP_KERNEL);
Matt Portereb188d02005-11-07 01:00:17 -0800348 if (!rdev)
Yang Li5f28c522009-05-11 22:36:02 +0000349 return NULL;
Matt Portereb188d02005-11-07 01:00:17 -0800350
Matt Portereb188d02005-11-07 01:00:17 -0800351 rdev->net = net;
Alexandre Bounineded05782011-01-12 17:00:39 -0800352 rdev->pef = result;
353 rdev->swpinfo = swpinfo;
Matt Portereb188d02005-11-07 01:00:17 -0800354 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
355 &result);
356 rdev->did = result >> 16;
357 rdev->vid = result & 0xffff;
358 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
359 &rdev->device_rev);
360 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
361 &result);
362 rdev->asm_did = result >> 16;
363 rdev->asm_vid = result & 0xffff;
364 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
365 &result);
366 rdev->asm_rev = result >> 16;
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700367 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
Matt Portereb188d02005-11-07 01:00:17 -0800368 rdev->efptr = result & 0xffff;
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700369 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
Alexandre Bounine1ae842d2016-08-02 14:06:57 -0700370 hopcount, &rdev->phys_rmap);
371 pr_debug("RIO: %s Register Map %d device\n",
372 __func__, rdev->phys_rmap);
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700373
374 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
375 hopcount, RIO_EFB_ERR_MGMNT);
Alexandre Bounine1ae842d2016-08-02 14:06:57 -0700376 if (!rdev->em_efptr)
377 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
378 hopcount, RIO_EFB_ERR_MGMNT_HS);
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700379 }
Matt Portereb188d02005-11-07 01:00:17 -0800380
381 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
382 &rdev->src_ops);
383 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
384 &rdev->dst_ops);
385
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700386 if (do_enum) {
387 /* Assign component tag to device */
388 if (next_comptag >= 0x10000) {
389 pr_err("RIO: Component Tag Counter Overflow\n");
390 goto cleanup;
391 }
392 rio_mport_write_config_32(port, destid, hopcount,
393 RIO_COMPONENT_TAG_CSR, next_comptag);
394 rdev->comp_tag = next_comptag++;
Alexandre Bounine2ec3ba62013-07-03 15:08:50 -0700395 rdev->do_enum = true;
Alexandre Bounine558bda62011-01-12 17:00:42 -0800396 } else {
397 rio_mport_read_config_32(port, destid, hopcount,
398 RIO_COMPONENT_TAG_CSR,
399 &rdev->comp_tag);
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700400 }
401
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800402 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
403 if (do_enum) {
404 rio_set_device_id(port, destid, hopcount, next_destid);
Alexandre Bouninede74e002012-10-04 17:16:13 -0700405 rdev->destid = next_destid;
406 next_destid = rio_destid_alloc(net);
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800407 } else
408 rdev->destid = rio_get_device_id(port, destid, hopcount);
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800409
410 rdev->hopcount = 0xff;
411 } else {
412 /* Switch device has an associated destID which
413 * will be adjusted later
414 */
415 rdev->destid = destid;
416 rdev->hopcount = hopcount;
417 }
Matt Portereb188d02005-11-07 01:00:17 -0800418
419 /* If a PE has both switch and other functions, show it as a switch */
420 if (rio_is_switch(rdev)) {
Alexandre Bounineded05782011-01-12 17:00:39 -0800421 rswitch = rdev->rswitch;
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700422 rswitch->port_ok = 0;
Alexandre Bounine2ec3ba62013-07-03 15:08:50 -0700423 spin_lock_init(&rswitch->lock);
Kees Cook6396bb22018-06-12 14:03:40 -0700424 rswitch->route_table =
425 kzalloc(RIO_MAX_ROUTE_ENTRIES(port->sys_size),
426 GFP_KERNEL);
Yang Li5f28c522009-05-11 22:36:02 +0000427 if (!rswitch->route_table)
428 goto cleanup;
Matt Portereb188d02005-11-07 01:00:17 -0800429 /* Initialize switch route table */
Zhang Weie0423232008-04-18 13:33:42 -0700430 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
431 rdid++)
Matt Portereb188d02005-11-07 01:00:17 -0800432 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
Kay Sieversb53c75832008-12-04 10:01:52 -0800433 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
Alexandre Bounine6ca40c22013-07-03 15:09:01 -0700434 rdev->comp_tag & RIO_CTAG_UDEVID);
Matt Portereb188d02005-11-07 01:00:17 -0800435
Alexandre Bounine2ec3ba62013-07-03 15:08:50 -0700436 if (do_enum)
437 rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0);
Thomas Moll933af4a2010-05-26 14:44:01 -0700438 } else {
439 if (do_enum)
Alexandre Bounine1ae842d2016-08-02 14:06:57 -0700440 /*Enable Input Output Port (transmitter receiver)*/
Thomas Moll933af4a2010-05-26 14:44:01 -0700441 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
442
Kay Sieversb53c75832008-12-04 10:01:52 -0800443 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
Alexandre Bounine6ca40c22013-07-03 15:09:01 -0700444 rdev->comp_tag & RIO_CTAG_UDEVID);
Thomas Moll933af4a2010-05-26 14:44:01 -0700445 }
Matt Portereb188d02005-11-07 01:00:17 -0800446
Alexandre Bouninee6b585c2016-03-22 14:26:17 -0700447 rdev->dev.parent = &net->dev;
Alexandre Bouninea11650e2013-05-24 15:55:05 -0700448 rio_attach_device(rdev);
Matt Portereb188d02005-11-07 01:00:17 -0800449 rdev->dev.release = rio_release_dev;
Yang Hongyang284901a2009-04-06 19:01:15 -0700450 rdev->dma_mask = DMA_BIT_MASK(32);
Matt Porterfa78cc52005-11-07 01:00:18 -0800451 rdev->dev.dma_mask = &rdev->dma_mask;
Yang Hongyang284901a2009-04-06 19:01:15 -0700452 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
Matt Portereb188d02005-11-07 01:00:17 -0800453
Alexandre Bounine284fb682011-08-25 15:59:13 -0700454 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
Matt Portereb188d02005-11-07 01:00:17 -0800455 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
456 0, 0xffff);
457
Yang Li5f28c522009-05-11 22:36:02 +0000458 ret = rio_add_device(rdev);
459 if (ret)
460 goto cleanup;
Matt Portereb188d02005-11-07 01:00:17 -0800461
Alexandre Bounineb74ec562016-03-22 14:26:14 -0700462 rio_dev_get(rdev);
463
Matt Portereb188d02005-11-07 01:00:17 -0800464 return rdev;
Yang Li5f28c522009-05-11 22:36:02 +0000465
466cleanup:
Alexandre Bounine166c0502011-11-02 13:39:11 -0700467 if (rswitch)
Yang Li5f28c522009-05-11 22:36:02 +0000468 kfree(rswitch->route_table);
Alexandre Bounineded05782011-01-12 17:00:39 -0800469
Yang Li5f28c522009-05-11 22:36:02 +0000470 kfree(rdev);
471 return NULL;
Matt Portereb188d02005-11-07 01:00:17 -0800472}
473
474/**
475 * rio_sport_is_active- Tests if a switch port has an active connection.
Alexandre Bounine1ae842d2016-08-02 14:06:57 -0700476 * @rdev: RapidIO device object
477 * @sp: Switch port number
Matt Portereb188d02005-11-07 01:00:17 -0800478 *
479 * Reads the port error status CSR for a particular switch port to
480 * determine if the port has an active link. Returns
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700481 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
Matt Portereb188d02005-11-07 01:00:17 -0800482 * inactive.
483 */
484static int
Alexandre Bounine1ae842d2016-08-02 14:06:57 -0700485rio_sport_is_active(struct rio_dev *rdev, int sp)
Matt Portereb188d02005-11-07 01:00:17 -0800486{
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700487 u32 result = 0;
Matt Portereb188d02005-11-07 01:00:17 -0800488
Alexandre Bounine1ae842d2016-08-02 14:06:57 -0700489 rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, sp),
490 &result);
Matt Portereb188d02005-11-07 01:00:17 -0800491
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700492 return result & RIO_PORT_N_ERR_STS_PORT_OK;
Matt Portereb188d02005-11-07 01:00:17 -0800493}
494
495/**
Matt Portereb188d02005-11-07 01:00:17 -0800496 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
497 * @port: Master port to send transaction
498 * @hopcount: Number of hops to the device
499 *
500 * Used during enumeration to read the Host Device ID Lock CSR on a
501 * RIO device. Returns the value of the lock register.
502 */
503static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
504{
505 u32 result;
506
Zhang Weie0423232008-04-18 13:33:42 -0700507 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
Matt Portereb188d02005-11-07 01:00:17 -0800508 RIO_HOST_DID_LOCK_CSR, &result);
509
510 return (u16) (result & 0xffff);
511}
512
513/**
Matt Portereb188d02005-11-07 01:00:17 -0800514 * rio_enum_peer- Recursively enumerate a RIO network through a master port
515 * @net: RIO network being enumerated
516 * @port: Master port to send transactions
517 * @hopcount: Number of hops into the network
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700518 * @prev: Previous RIO device connected to the enumerated one
519 * @prev_port: Port on previous RIO device
Matt Portereb188d02005-11-07 01:00:17 -0800520 *
521 * Recursively enumerates a RIO network. Transactions are sent via the
522 * master port passed in @port.
523 */
Bill Pemberton305c891e2012-11-19 13:23:25 -0500524static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700525 u8 hopcount, struct rio_dev *prev, int prev_port)
Matt Portereb188d02005-11-07 01:00:17 -0800526{
Matt Portereb188d02005-11-07 01:00:17 -0800527 struct rio_dev *rdev;
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700528 u32 regval;
Matt Portereb188d02005-11-07 01:00:17 -0800529 int tmp;
530
Alexandre Bouninee274e0e2010-10-27 15:34:32 -0700531 if (rio_mport_chk_dev_access(port,
532 RIO_ANY_DESTID(port->sys_size), hopcount)) {
533 pr_debug("RIO: device access check failed\n");
534 return -1;
535 }
536
Matt Portereb188d02005-11-07 01:00:17 -0800537 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
538 pr_debug("RIO: PE already discovered by this host\n");
539 /*
540 * Already discovered by this host. Add it as another
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700541 * link to the existing device.
Matt Portereb188d02005-11-07 01:00:17 -0800542 */
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700543 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
544 hopcount, RIO_COMPONENT_TAG_CSR, &regval);
545
546 if (regval) {
547 rdev = rio_get_comptag((regval & 0xffff), NULL);
548
549 if (rdev && prev && rio_is_switch(prev)) {
550 pr_debug("RIO: redundant path to %s\n",
551 rio_name(rdev));
552 prev->rswitch->nextdev[prev_port] = rdev;
553 }
554 }
555
Matt Portereb188d02005-11-07 01:00:17 -0800556 return 0;
557 }
558
559 /* Attempt to acquire device lock */
Zhang Weie0423232008-04-18 13:33:42 -0700560 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
561 hopcount,
Matt Portereb188d02005-11-07 01:00:17 -0800562 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
563 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
564 < port->host_deviceid) {
565 /* Delay a bit */
566 mdelay(1);
567 /* Attempt to acquire device lock again */
Zhang Weie0423232008-04-18 13:33:42 -0700568 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
569 hopcount,
Matt Portereb188d02005-11-07 01:00:17 -0800570 RIO_HOST_DID_LOCK_CSR,
571 port->host_deviceid);
572 }
573
574 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
575 pr_debug(
576 "RIO: PE locked by a higher priority host...retreating\n");
577 return -1;
578 }
579
580 /* Setup new RIO device */
Zhang Weie0423232008-04-18 13:33:42 -0700581 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
582 hopcount, 1);
583 if (rdev) {
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700584 rdev->prev = prev;
585 if (prev && rio_is_switch(prev))
586 prev->rswitch->nextdev[prev_port] = rdev;
Matt Portereb188d02005-11-07 01:00:17 -0800587 } else
588 return -1;
589
590 if (rio_is_switch(rdev)) {
Alexandre Bouninede74e002012-10-04 17:16:13 -0700591 int sw_destid;
592 int cur_destid;
593 int sw_inport;
594 u16 destid;
595 int port_num;
596
Alexandre Bounineae05cbd2010-10-27 15:34:29 -0700597 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800598 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700599 port->host_deviceid, sw_inport, 0);
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800600 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
Matt Portereb188d02005-11-07 01:00:17 -0800601
Alexandre Bouninede74e002012-10-04 17:16:13 -0700602 destid = rio_destid_first(net);
603 while (destid != RIO_INVALID_DESTID && destid < next_destid) {
604 if (destid != port->host_deviceid) {
605 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
606 destid, sw_inport, 0);
607 rdev->rswitch->route_table[destid] = sw_inport;
608 }
609 destid = rio_destid_next(net, destid + 1);
Matt Portereb188d02005-11-07 01:00:17 -0800610 }
Matt Portereb188d02005-11-07 01:00:17 -0800611 pr_debug(
612 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700613 rio_name(rdev), rdev->vid, rdev->did,
614 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800615 sw_destid = next_destid;
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700616 for (port_num = 0;
617 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
618 port_num++) {
Alexandre Bounine8d4630d2012-10-04 17:16:02 -0700619 if (sw_inport == port_num) {
620 rio_enable_rx_tx_port(port, 0,
Thomas Moll933af4a2010-05-26 14:44:01 -0700621 RIO_ANY_DESTID(port->sys_size),
622 hopcount, port_num);
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700623 rdev->rswitch->port_ok |= (1 << port_num);
Matt Portereb188d02005-11-07 01:00:17 -0800624 continue;
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700625 }
Matt Portereb188d02005-11-07 01:00:17 -0800626
627 cur_destid = next_destid;
628
Alexandre Bounine1ae842d2016-08-02 14:06:57 -0700629 if (rio_sport_is_active(rdev, port_num)) {
Matt Portereb188d02005-11-07 01:00:17 -0800630 pr_debug(
631 "RIO: scanning device on port %d\n",
632 port_num);
Alexandre Bounine8d4630d2012-10-04 17:16:02 -0700633 rio_enable_rx_tx_port(port, 0,
634 RIO_ANY_DESTID(port->sys_size),
635 hopcount, port_num);
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700636 rdev->rswitch->port_ok |= (1 << port_num);
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800637 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
Zhang Weie0423232008-04-18 13:33:42 -0700638 RIO_ANY_DESTID(port->sys_size),
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700639 port_num, 0);
Matt Portereb188d02005-11-07 01:00:17 -0800640
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700641 if (rio_enum_peer(net, port, hopcount + 1,
642 rdev, port_num) < 0)
Matt Portereb188d02005-11-07 01:00:17 -0800643 return -1;
644
645 /* Update routing tables */
Alexandre Bouninede74e002012-10-04 17:16:13 -0700646 destid = rio_destid_next(net, cur_destid + 1);
647 if (destid != RIO_INVALID_DESTID) {
Matt Portereb188d02005-11-07 01:00:17 -0800648 for (destid = cur_destid;
Alexandre Bouninede74e002012-10-04 17:16:13 -0700649 destid < next_destid;) {
650 if (destid != port->host_deviceid) {
651 rio_route_add_entry(rdev,
Matt Portereb188d02005-11-07 01:00:17 -0800652 RIO_GLOBAL_TABLE,
653 destid,
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700654 port_num,
655 0);
Alexandre Bouninede74e002012-10-04 17:16:13 -0700656 rdev->rswitch->
657 route_table[destid] =
658 port_num;
659 }
660 destid = rio_destid_next(net,
661 destid + 1);
Matt Portereb188d02005-11-07 01:00:17 -0800662 }
Matt Portereb188d02005-11-07 01:00:17 -0800663 }
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700664 } else {
665 /* If switch supports Error Management,
666 * set PORT_LOCKOUT bit for unused port
667 */
668 if (rdev->em_efptr)
669 rio_set_port_lockout(rdev, port_num, 1);
670
671 rdev->rswitch->port_ok &= ~(1 << port_num);
Matt Portereb188d02005-11-07 01:00:17 -0800672 }
673 }
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800674
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700675 /* Direct Port-write messages to the enumeratiing host */
676 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
677 (rdev->em_efptr)) {
678 rio_write_config_32(rdev,
679 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
680 (port->host_deviceid << 16) |
681 (port->sys_size << 15));
682 }
683
684 rio_init_em(rdev);
685
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800686 /* Check for empty switch */
Alexandre Bouninede74e002012-10-04 17:16:13 -0700687 if (next_destid == sw_destid)
688 next_destid = rio_destid_alloc(net);
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800689
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800690 rdev->destid = sw_destid;
Matt Portereb188d02005-11-07 01:00:17 -0800691 } else
692 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
693 rio_name(rdev), rdev->vid, rdev->did);
694
695 return 0;
696}
697
698/**
699 * rio_enum_complete- Tests if enumeration of a network is complete
700 * @port: Master port to send transaction
701 *
Liu Ganga5712592011-11-02 13:39:05 -0700702 * Tests the PGCCSR discovered bit for non-zero value (enumeration
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700703 * complete flag). Return %1 if enumeration is complete or %0 if
Matt Portereb188d02005-11-07 01:00:17 -0800704 * enumeration is incomplete.
705 */
706static int rio_enum_complete(struct rio_mport *port)
707{
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700708 u32 regval;
Matt Portereb188d02005-11-07 01:00:17 -0800709
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700710 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
711 &regval);
Liu Ganga5712592011-11-02 13:39:05 -0700712 return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
Matt Portereb188d02005-11-07 01:00:17 -0800713}
714
715/**
716 * rio_disc_peer- Recursively discovers a RIO network through a master port
717 * @net: RIO network being discovered
718 * @port: Master port to send transactions
719 * @destid: Current destination ID in network
720 * @hopcount: Number of hops into the network
Randy Dunlap9b310ac2011-01-22 20:16:12 -0800721 * @prev: previous rio_dev
722 * @prev_port: previous port number
Matt Portereb188d02005-11-07 01:00:17 -0800723 *
724 * Recursively discovers a RIO network. Transactions are sent via the
725 * master port passed in @port.
726 */
Bill Pemberton305c891e2012-11-19 13:23:25 -0500727static int
Matt Portereb188d02005-11-07 01:00:17 -0800728rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
Alexandre Bounine17e96202011-01-12 17:00:41 -0800729 u8 hopcount, struct rio_dev *prev, int prev_port)
Matt Portereb188d02005-11-07 01:00:17 -0800730{
731 u8 port_num, route_port;
Matt Portereb188d02005-11-07 01:00:17 -0800732 struct rio_dev *rdev;
733 u16 ndestid;
734
735 /* Setup new RIO device */
736 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
Alexandre Bounine17e96202011-01-12 17:00:41 -0800737 rdev->prev = prev;
738 if (prev && rio_is_switch(prev))
739 prev->rswitch->nextdev[prev_port] = rdev;
Matt Portereb188d02005-11-07 01:00:17 -0800740 } else
741 return -1;
742
743 if (rio_is_switch(rdev)) {
Matt Portereb188d02005-11-07 01:00:17 -0800744 /* Associated destid is how we accessed this switch */
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800745 rdev->destid = destid;
Matt Portereb188d02005-11-07 01:00:17 -0800746
Matt Portereb188d02005-11-07 01:00:17 -0800747 pr_debug(
748 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700749 rio_name(rdev), rdev->vid, rdev->did,
750 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
751 for (port_num = 0;
752 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
753 port_num++) {
Alexandre Bounineae05cbd2010-10-27 15:34:29 -0700754 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
Matt Portereb188d02005-11-07 01:00:17 -0800755 continue;
756
Alexandre Bounine1ae842d2016-08-02 14:06:57 -0700757 if (rio_sport_is_active(rdev, port_num)) {
Matt Portereb188d02005-11-07 01:00:17 -0800758 pr_debug(
759 "RIO: scanning device on port %d\n",
760 port_num);
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700761
762 rio_lock_device(port, destid, hopcount, 1000);
763
Zhang Weie0423232008-04-18 13:33:42 -0700764 for (ndestid = 0;
765 ndestid < RIO_ANY_DESTID(port->sys_size);
Matt Portereb188d02005-11-07 01:00:17 -0800766 ndestid++) {
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800767 rio_route_get_entry(rdev,
Matt Portereb188d02005-11-07 01:00:17 -0800768 RIO_GLOBAL_TABLE,
769 ndestid,
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700770 &route_port, 0);
Matt Portereb188d02005-11-07 01:00:17 -0800771 if (route_port == port_num)
772 break;
773 }
774
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700775 if (ndestid == RIO_ANY_DESTID(port->sys_size))
776 continue;
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700777 rio_unlock_device(port, destid, hopcount);
Alexandre Bounine17e96202011-01-12 17:00:41 -0800778 if (rio_disc_peer(net, port, ndestid,
779 hopcount + 1, rdev, port_num) < 0)
Matt Portereb188d02005-11-07 01:00:17 -0800780 return -1;
781 }
782 }
783 } else
784 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
785 rio_name(rdev), rdev->vid, rdev->did);
786
787 return 0;
788}
789
790/**
791 * rio_mport_is_active- Tests if master port link is active
792 * @port: Master port to test
793 *
794 * Reads the port error status CSR for the master port to
795 * determine if the port has an active link. Returns
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700796 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
Matt Portereb188d02005-11-07 01:00:17 -0800797 * or %0 if it is inactive.
798 */
799static int rio_mport_is_active(struct rio_mport *port)
800{
801 u32 result = 0;
Matt Portereb188d02005-11-07 01:00:17 -0800802
Alexandre Bounine1ae842d2016-08-02 14:06:57 -0700803 rio_local_read_config_32(port,
804 port->phys_efptr +
805 RIO_PORT_N_ERR_STS_CSR(port->index, port->phys_rmap),
806 &result);
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700807 return result & RIO_PORT_N_ERR_STS_PORT_OK;
Matt Portereb188d02005-11-07 01:00:17 -0800808}
809
Alexandre Bouninee6b585c2016-03-22 14:26:17 -0700810static void rio_scan_release_net(struct rio_net *net)
811{
812 pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
813 kfree(net->enum_data);
814}
815
816static void rio_scan_release_dev(struct device *dev)
Matt Portereb188d02005-11-07 01:00:17 -0800817{
818 struct rio_net *net;
819
Alexandre Bouninee6b585c2016-03-22 14:26:17 -0700820 net = to_rio_net(dev);
821 pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
822 kfree(net);
823}
Alexandre Bouninede74e002012-10-04 17:16:13 -0700824
Alexandre Bouninee6b585c2016-03-22 14:26:17 -0700825/*
826 * rio_scan_alloc_net - Allocate and configure a new RIO network
827 * @mport: Master port associated with the RIO network
828 * @do_enum: Enumeration/Discovery mode flag
829 * @start: logical minimal start id for new net
830 *
831 * Allocates a new RIO network structure and initializes enumerator-specific
832 * part of it (if required).
833 * Returns a RIO network pointer on success or %NULL on failure.
834 */
835static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport,
836 int do_enum, u16 start)
837{
838 struct rio_net *net;
839
840 net = rio_alloc_net(mport);
841
842 if (net && do_enum) {
843 struct rio_id_table *idtab;
844 size_t size;
845
846 size = sizeof(struct rio_id_table) +
847 BITS_TO_LONGS(
848 RIO_MAX_ROUTE_ENTRIES(mport->sys_size)
849 ) * sizeof(long);
850
851 idtab = kzalloc(size, GFP_KERNEL);
852
853 if (idtab == NULL) {
Alexandre Bouninede74e002012-10-04 17:16:13 -0700854 pr_err("RIO: failed to allocate destID table\n");
Alexandre Bouninee6b585c2016-03-22 14:26:17 -0700855 rio_free_net(net);
Alexandre Bouninede74e002012-10-04 17:16:13 -0700856 net = NULL;
857 } else {
Alexandre Bouninee6b585c2016-03-22 14:26:17 -0700858 net->enum_data = idtab;
859 net->release = rio_scan_release_net;
860 idtab->start = start;
861 idtab->max = RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
862 spin_lock_init(&idtab->lock);
Alexandre Bouninede74e002012-10-04 17:16:13 -0700863 }
864 }
865
Matt Portereb188d02005-11-07 01:00:17 -0800866 if (net) {
Alexandre Bouninee6b585c2016-03-22 14:26:17 -0700867 net->id = mport->id;
868 net->hport = mport;
869 dev_set_name(&net->dev, "rnet_%d", net->id);
870 net->dev.parent = &mport->dev;
871 net->dev.release = rio_scan_release_dev;
872 rio_add_net(net);
Matt Portereb188d02005-11-07 01:00:17 -0800873 }
Alexandre Bouninee6b585c2016-03-22 14:26:17 -0700874
Matt Portereb188d02005-11-07 01:00:17 -0800875 return net;
876}
877
878/**
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800879 * rio_update_route_tables- Updates route tables in switches
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700880 * @net: RIO network to run update on
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800881 *
882 * For each enumerated device, ensure that each switch in a system
883 * has correct routing entries. Add routes for devices that where
Vasyl Gomonovychb94bb1f2018-04-10 16:35:06 -0700884 * unknown during the first enumeration pass through the switch.
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800885 */
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700886static void rio_update_route_tables(struct rio_net *net)
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800887{
Alexandre Bounineded05782011-01-12 17:00:39 -0800888 struct rio_dev *rdev, *swrdev;
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800889 struct rio_switch *rswitch;
890 u8 sport;
891 u16 destid;
892
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700893 list_for_each_entry(rdev, &net->devices, net_list) {
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800894
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800895 destid = rdev->destid;
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800896
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700897 list_for_each_entry(rswitch, &net->switches, node) {
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800898
899 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
900 continue;
901
902 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
Alexandre Bounineded05782011-01-12 17:00:39 -0800903 swrdev = sw_to_rio_dev(rswitch);
904
Alexandre Bounine07590ff2010-05-26 14:43:57 -0700905 /* Skip if destid ends in empty switch*/
Alexandre Bounineded05782011-01-12 17:00:39 -0800906 if (swrdev->destid == destid)
Alexandre Bounine07590ff2010-05-26 14:43:57 -0700907 continue;
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800908
Alexandre Bounineded05782011-01-12 17:00:39 -0800909 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800910
Alexandre Bounine2ec3ba62013-07-03 15:08:50 -0700911 rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE,
912 destid, sport, 0);
913 rswitch->route_table[destid] = sport;
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800914 }
915 }
916 }
917}
918
919/**
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700920 * rio_init_em - Initializes RIO Error Management (for switches)
Randy Dunlap97ef6f72010-05-28 15:08:08 -0700921 * @rdev: RIO device
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700922 *
923 * For each enumerated switch, call device-specific error management
924 * initialization routine (if supplied by the switch driver).
925 */
926static void rio_init_em(struct rio_dev *rdev)
927{
928 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
Alexandre Bounine2ec3ba62013-07-03 15:08:50 -0700929 rdev->rswitch->ops && rdev->rswitch->ops->em_init) {
930 rdev->rswitch->ops->em_init(rdev);
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700931 }
932}
933
934/**
Matt Portereb188d02005-11-07 01:00:17 -0800935 * rio_enum_mport- Start enumeration through a master port
936 * @mport: Master port to send transactions
Alexandre Bouninebc8fcfe2013-05-24 15:55:06 -0700937 * @flags: Enumeration control flags
Matt Portereb188d02005-11-07 01:00:17 -0800938 *
939 * Starts the enumeration process. If somebody has enumerated our
940 * master port device, then give up. If not and we have an active
941 * link, then start recursive peer enumeration. Returns %0 if
942 * enumeration succeeds or %-EBUSY if enumeration fails.
943 */
Wu Fengguang36f0efb2013-07-03 15:08:49 -0700944static int rio_enum_mport(struct rio_mport *mport, u32 flags)
Matt Portereb188d02005-11-07 01:00:17 -0800945{
946 struct rio_net *net = NULL;
947 int rc = 0;
948
949 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
950 mport->name);
Alexandre Bouninebc8fcfe2013-05-24 15:55:06 -0700951
952 /*
953 * To avoid multiple start requests (repeat enumeration is not supported
954 * by this method) check if enumeration/discovery was performed for this
955 * mport: if mport was added into the list of mports for a net exit
956 * with error.
957 */
958 if (mport->nnode.next || mport->nnode.prev)
959 return -EBUSY;
960
Matt Portereb188d02005-11-07 01:00:17 -0800961 /* If somebody else enumerated our master port device, bail. */
962 if (rio_enum_host(mport) < 0) {
963 printk(KERN_INFO
964 "RIO: master port %d device has been enumerated by a remote host\n",
965 mport->id);
966 rc = -EBUSY;
967 goto out;
968 }
969
970 /* If master port has an active link, allocate net and enum peers */
971 if (rio_mport_is_active(mport)) {
Alexandre Bouninee6b585c2016-03-22 14:26:17 -0700972 net = rio_scan_alloc_net(mport, 1, 0);
Alexandre Bouninede74e002012-10-04 17:16:13 -0700973 if (!net) {
Matt Portereb188d02005-11-07 01:00:17 -0800974 printk(KERN_ERR "RIO: failed to allocate new net\n");
975 rc = -ENOMEM;
976 goto out;
977 }
Thomas Moll933af4a2010-05-26 14:44:01 -0700978
Alexandre Bouninede74e002012-10-04 17:16:13 -0700979 /* reserve mport destID in new net */
980 rio_destid_reserve(net, mport->host_deviceid);
981
Vasyl Gomonovychb94bb1f2018-04-10 16:35:06 -0700982 /* Enable Input Output Port (transmitter receiver) */
Thomas Moll933af4a2010-05-26 14:44:01 -0700983 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
984
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700985 /* Set component tag for host */
986 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
987 next_comptag++);
988
Alexandre Bouninede74e002012-10-04 17:16:13 -0700989 next_destid = rio_destid_alloc(net);
990
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700991 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
Matt Portereb188d02005-11-07 01:00:17 -0800992 /* A higher priority host won enumeration, bail. */
993 printk(KERN_INFO
994 "RIO: master port %d device has lost enumeration to a remote host\n",
995 mport->id);
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700996 rio_clear_locks(net);
Matt Portereb188d02005-11-07 01:00:17 -0800997 rc = -EBUSY;
998 goto out;
999 }
Alexandre Bouninede74e002012-10-04 17:16:13 -07001000 /* free the last allocated destID (unused) */
1001 rio_destid_free(net, next_destid);
Alexandre Bouninea7071ef2012-10-04 17:16:05 -07001002 rio_update_route_tables(net);
1003 rio_clear_locks(net);
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -07001004 rio_pw_enable(mport, 1);
Matt Portereb188d02005-11-07 01:00:17 -08001005 } else {
1006 printk(KERN_INFO "RIO: master port %d link inactive\n",
1007 mport->id);
1008 rc = -EINVAL;
1009 }
1010
1011 out:
1012 return rc;
1013}
1014
1015/**
1016 * rio_build_route_tables- Generate route tables from switch route entries
Alexandre Bouninea7071ef2012-10-04 17:16:05 -07001017 * @net: RIO network to run route tables scan on
Matt Portereb188d02005-11-07 01:00:17 -08001018 *
1019 * For each switch device, generate a route table by copying existing
1020 * route entries from the switch.
1021 */
Alexandre Bouninea7071ef2012-10-04 17:16:05 -07001022static void rio_build_route_tables(struct rio_net *net)
Matt Portereb188d02005-11-07 01:00:17 -08001023{
Alexandre Bouninea7071ef2012-10-04 17:16:05 -07001024 struct rio_switch *rswitch;
Matt Portereb188d02005-11-07 01:00:17 -08001025 struct rio_dev *rdev;
1026 int i;
1027 u8 sport;
1028
Alexandre Bouninea7071ef2012-10-04 17:16:05 -07001029 list_for_each_entry(rswitch, &net->switches, node) {
1030 rdev = sw_to_rio_dev(rswitch);
Alexandre Bounine818a04a2010-05-26 14:43:58 -07001031
Alexandre Bouninea7071ef2012-10-04 17:16:05 -07001032 rio_lock_device(net->hport, rdev->destid,
1033 rdev->hopcount, 1000);
1034 for (i = 0;
1035 i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1036 i++) {
1037 if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1038 i, &sport, 0) < 0)
1039 continue;
1040 rswitch->route_table[i] = sport;
Matt Portereb188d02005-11-07 01:00:17 -08001041 }
Alexandre Bouninea7071ef2012-10-04 17:16:05 -07001042
1043 rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1044 }
Matt Portereb188d02005-11-07 01:00:17 -08001045}
1046
1047/**
Matt Portereb188d02005-11-07 01:00:17 -08001048 * rio_disc_mport- Start discovery through a master port
1049 * @mport: Master port to send transactions
Alexandre Bouninebc8fcfe2013-05-24 15:55:06 -07001050 * @flags: discovery control flags
Matt Portereb188d02005-11-07 01:00:17 -08001051 *
1052 * Starts the discovery process. If we have an active link,
Alexandre Bouninebc8fcfe2013-05-24 15:55:06 -07001053 * then wait for the signal that enumeration is complete (if wait
1054 * is allowed).
Matt Portereb188d02005-11-07 01:00:17 -08001055 * When enumeration completion is signaled, start recursive
1056 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1057 * on failure.
1058 */
Wu Fengguang36f0efb2013-07-03 15:08:49 -07001059static int rio_disc_mport(struct rio_mport *mport, u32 flags)
Matt Portereb188d02005-11-07 01:00:17 -08001060{
1061 struct rio_net *net = NULL;
Alexandre Bouninefa3dbaa2012-10-04 17:16:04 -07001062 unsigned long to_end;
Matt Portereb188d02005-11-07 01:00:17 -08001063
1064 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1065 mport->name);
1066
1067 /* If master port has an active link, allocate net and discover peers */
1068 if (rio_mport_is_active(mport)) {
Alexandre Bouninebc8fcfe2013-05-24 15:55:06 -07001069 if (rio_enum_complete(mport))
1070 goto enum_done;
1071 else if (flags & RIO_SCAN_ENUM_NO_WAIT)
1072 return -EAGAIN;
1073
Alexandre Bouninefa3dbaa2012-10-04 17:16:04 -07001074 pr_debug("RIO: wait for enumeration to complete...\n");
1075
1076 to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1077 while (time_before(jiffies, to_end)) {
1078 if (rio_enum_complete(mport))
1079 goto enum_done;
Alexandre Bouninef4c9c0e2012-10-10 15:53:58 -07001080 msleep(10);
Alexandre Bouninefa3dbaa2012-10-04 17:16:04 -07001081 }
1082
1083 pr_debug("RIO: discovery timeout on mport %d %s\n",
1084 mport->id, mport->name);
1085 goto bail;
1086enum_done:
1087 pr_debug("RIO: ... enumeration done\n");
1088
Alexandre Bouninee6b585c2016-03-22 14:26:17 -07001089 net = rio_scan_alloc_net(mport, 0, 0);
Alexandre Bouninefa3dbaa2012-10-04 17:16:04 -07001090 if (!net) {
Matt Portereb188d02005-11-07 01:00:17 -08001091 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1092 goto bail;
1093 }
1094
Alexandre Bounine818a04a2010-05-26 14:43:58 -07001095 /* Read DestID assigned by enumerator */
1096 rio_local_read_config_32(mport, RIO_DID_CSR,
1097 &mport->host_deviceid);
1098 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1099 mport->host_deviceid);
1100
Zhang Weie0423232008-04-18 13:33:42 -07001101 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
Alexandre Bounine17e96202011-01-12 17:00:41 -08001102 0, NULL, 0) < 0) {
Matt Portereb188d02005-11-07 01:00:17 -08001103 printk(KERN_INFO
1104 "RIO: master port %d device has failed discovery\n",
1105 mport->id);
1106 goto bail;
1107 }
1108
Alexandre Bouninea7071ef2012-10-04 17:16:05 -07001109 rio_build_route_tables(net);
Matt Portereb188d02005-11-07 01:00:17 -08001110 }
1111
1112 return 0;
Alexandre Bouninefa3dbaa2012-10-04 17:16:04 -07001113bail:
Matt Portereb188d02005-11-07 01:00:17 -08001114 return -EBUSY;
1115}
Alexandre Bouninea11650e2013-05-24 15:55:05 -07001116
1117static struct rio_scan rio_scan_ops = {
Alexandre Bounine9edbc30b2013-07-03 15:08:53 -07001118 .owner = THIS_MODULE,
Alexandre Bouninea11650e2013-05-24 15:55:05 -07001119 .enumerate = rio_enum_mport,
1120 .discover = rio_disc_mport,
1121};
1122
1123static bool scan;
1124module_param(scan, bool, 0);
1125MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
1126 "(default = 0)");
1127
1128/**
1129 * rio_basic_attach:
1130 *
1131 * When this enumeration/discovery method is loaded as a module this function
1132 * registers its specific enumeration and discover routines for all available
1133 * RapidIO mport devices. The "scan" command line parameter controls ability of
1134 * the module to start RapidIO enumeration/discovery automatically.
1135 *
1136 * Returns 0 for success or -EIO if unable to register itself.
1137 *
1138 * This enumeration/discovery method cannot be unloaded and therefore does not
1139 * provide a matching cleanup_module routine.
1140 */
1141
1142static int __init rio_basic_attach(void)
1143{
1144 if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
1145 return -EIO;
1146 if (scan)
1147 rio_init_mports();
1148 return 0;
1149}
1150
1151late_initcall(rio_basic_attach);
1152
1153MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
1154MODULE_LICENSE("GPL");