blob: d6a126c17c032ac0352a3fac42e4a4400937e07b [file] [log] [blame]
Matt Portereb188d02005-11-07 01:00:17 -08001/*
2 * RapidIO enumeration and discovery support
3 *
4 * Copyright 2005 MontaVista Software, Inc.
5 * Matt Porter <mporter@kernel.crashing.org>
6 *
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -07007 * Copyright 2009 Integrated Device Technology, Inc.
8 * Alex Bounine <alexandre.bounine@idt.com>
9 * - Added Port-Write/Error Management initialization and handling
10 *
Thomas Moll933af4a2010-05-26 14:44:01 -070011 * Copyright 2009 Sysgo AG
12 * Thomas Moll <thomas.moll@sysgo.com>
13 * - Added Input- Output- enable functionality, to allow full communication
14 *
Matt Portereb188d02005-11-07 01:00:17 -080015 * This program is free software; you can redistribute it and/or modify it
16 * under the terms of the GNU General Public License as published by the
17 * Free Software Foundation; either version 2 of the License, or (at your
18 * option) any later version.
19 */
20
Matt Portereb188d02005-11-07 01:00:17 -080021#include <linux/types.h>
22#include <linux/kernel.h>
23
24#include <linux/delay.h>
Matt Porterfa78cc52005-11-07 01:00:18 -080025#include <linux/dma-mapping.h>
Matt Portereb188d02005-11-07 01:00:17 -080026#include <linux/init.h>
27#include <linux/rio.h>
28#include <linux/rio_drv.h>
29#include <linux/rio_ids.h>
30#include <linux/rio_regs.h>
31#include <linux/module.h>
32#include <linux/spinlock.h>
33#include <linux/timer.h>
Alexandre Bouninefa3dbaa2012-10-04 17:16:04 -070034#include <linux/sched.h>
Tim Schmielaude259682006-01-08 01:02:05 -080035#include <linux/jiffies.h>
36#include <linux/slab.h>
Matt Portereb188d02005-11-07 01:00:17 -080037
38#include "rio.h"
39
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -070040static void rio_init_em(struct rio_dev *rdev);
41
Matt Portereb188d02005-11-07 01:00:17 -080042static int next_destid = 0;
Alexandre Bounineaf84ca32010-10-27 15:34:34 -070043static int next_comptag = 1;
Matt Portereb188d02005-11-07 01:00:17 -080044
Matt Portereb188d02005-11-07 01:00:17 -080045static int rio_mport_phys_table[] = {
46 RIO_EFB_PAR_EP_ID,
47 RIO_EFB_PAR_EP_REC_ID,
48 RIO_EFB_SER_EP_ID,
49 RIO_EFB_SER_EP_REC_ID,
50 -1,
51};
52
Alexandre Bouninede74e002012-10-04 17:16:13 -070053
Alexandre Bounine4ed134b2012-10-10 15:54:01 -070054/**
Alexandre Bouninede74e002012-10-04 17:16:13 -070055 * rio_destid_alloc - Allocate next available destID for given network
Alexandre Bounine4ed134b2012-10-10 15:54:01 -070056 * @net: RIO network
Alexandre Bouninede74e002012-10-04 17:16:13 -070057 *
58 * Returns next available device destination ID for the specified RIO network.
59 * Marks allocated ID as one in use.
60 * Returns RIO_INVALID_DESTID if new destID is not available.
61 */
62static u16 rio_destid_alloc(struct rio_net *net)
63{
64 int destid;
65 struct rio_id_table *idtab = &net->destid_table;
66
67 spin_lock(&idtab->lock);
Alexandre Bounine4ed134b2012-10-10 15:54:01 -070068 destid = find_first_zero_bit(idtab->table, idtab->max);
Alexandre Bouninede74e002012-10-04 17:16:13 -070069
70 if (destid < idtab->max) {
Alexandre Bouninede74e002012-10-04 17:16:13 -070071 set_bit(destid, idtab->table);
72 destid += idtab->start;
73 } else
74 destid = RIO_INVALID_DESTID;
75
76 spin_unlock(&idtab->lock);
77 return (u16)destid;
78}
79
Alexandre Bounine4ed134b2012-10-10 15:54:01 -070080/**
Alexandre Bouninede74e002012-10-04 17:16:13 -070081 * rio_destid_reserve - Reserve the specivied destID
Alexandre Bounine4ed134b2012-10-10 15:54:01 -070082 * @net: RIO network
83 * @destid: destID to reserve
Alexandre Bouninede74e002012-10-04 17:16:13 -070084 *
85 * Tries to reserve the specified destID.
Masanari Iida76679282015-05-08 00:02:27 +090086 * Returns 0 if successful.
Alexandre Bouninede74e002012-10-04 17:16:13 -070087 */
88static int rio_destid_reserve(struct rio_net *net, u16 destid)
89{
90 int oldbit;
91 struct rio_id_table *idtab = &net->destid_table;
92
93 destid -= idtab->start;
94 spin_lock(&idtab->lock);
95 oldbit = test_and_set_bit(destid, idtab->table);
96 spin_unlock(&idtab->lock);
97 return oldbit;
98}
99
Alexandre Bounine4ed134b2012-10-10 15:54:01 -0700100/**
Alexandre Bouninede74e002012-10-04 17:16:13 -0700101 * rio_destid_free - free a previously allocated destID
Alexandre Bounine4ed134b2012-10-10 15:54:01 -0700102 * @net: RIO network
103 * @destid: destID to free
Alexandre Bouninede74e002012-10-04 17:16:13 -0700104 *
105 * Makes the specified destID available for use.
106 */
107static void rio_destid_free(struct rio_net *net, u16 destid)
108{
109 struct rio_id_table *idtab = &net->destid_table;
110
111 destid -= idtab->start;
112 spin_lock(&idtab->lock);
113 clear_bit(destid, idtab->table);
114 spin_unlock(&idtab->lock);
115}
116
Alexandre Bounine4ed134b2012-10-10 15:54:01 -0700117/**
Alexandre Bouninede74e002012-10-04 17:16:13 -0700118 * rio_destid_first - return first destID in use
Alexandre Bounine4ed134b2012-10-10 15:54:01 -0700119 * @net: RIO network
Alexandre Bouninede74e002012-10-04 17:16:13 -0700120 */
121static u16 rio_destid_first(struct rio_net *net)
122{
123 int destid;
124 struct rio_id_table *idtab = &net->destid_table;
125
126 spin_lock(&idtab->lock);
127 destid = find_first_bit(idtab->table, idtab->max);
128 if (destid >= idtab->max)
129 destid = RIO_INVALID_DESTID;
130 else
131 destid += idtab->start;
132 spin_unlock(&idtab->lock);
133 return (u16)destid;
134}
135
Alexandre Bounine4ed134b2012-10-10 15:54:01 -0700136/**
Alexandre Bouninede74e002012-10-04 17:16:13 -0700137 * rio_destid_next - return next destID in use
Alexandre Bounine4ed134b2012-10-10 15:54:01 -0700138 * @net: RIO network
139 * @from: destination ID from which search shall continue
Alexandre Bouninede74e002012-10-04 17:16:13 -0700140 */
141static u16 rio_destid_next(struct rio_net *net, u16 from)
142{
143 int destid;
144 struct rio_id_table *idtab = &net->destid_table;
145
146 spin_lock(&idtab->lock);
147 destid = find_next_bit(idtab->table, idtab->max, from);
148 if (destid >= idtab->max)
149 destid = RIO_INVALID_DESTID;
150 else
151 destid += idtab->start;
152 spin_unlock(&idtab->lock);
153 return (u16)destid;
154}
155
Matt Portereb188d02005-11-07 01:00:17 -0800156/**
157 * rio_get_device_id - Get the base/extended device id for a device
158 * @port: RIO master port
159 * @destid: Destination ID of device
160 * @hopcount: Hopcount to device
161 *
162 * Reads the base/extended device id from a device. Returns the
163 * 8/16-bit device ID.
164 */
165static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
166{
167 u32 result;
168
169 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
170
Zhang Weie0423232008-04-18 13:33:42 -0700171 return RIO_GET_DID(port->sys_size, result);
Matt Portereb188d02005-11-07 01:00:17 -0800172}
173
174/**
175 * rio_set_device_id - Set the base/extended device id for a device
176 * @port: RIO master port
177 * @destid: Destination ID of device
178 * @hopcount: Hopcount to device
179 * @did: Device ID value to be written
180 *
181 * Writes the base/extended device id from a device.
182 */
Matt Porterfa78cc52005-11-07 01:00:18 -0800183static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
Matt Portereb188d02005-11-07 01:00:17 -0800184{
185 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
Zhang Weie0423232008-04-18 13:33:42 -0700186 RIO_SET_DID(port->sys_size, did));
Matt Portereb188d02005-11-07 01:00:17 -0800187}
188
189/**
190 * rio_local_set_device_id - Set the base/extended device id for a port
191 * @port: RIO master port
192 * @did: Device ID value to be written
193 *
194 * Writes the base/extended device id from a device.
195 */
196static void rio_local_set_device_id(struct rio_mport *port, u16 did)
197{
Zhang Weie0423232008-04-18 13:33:42 -0700198 rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
199 did));
Matt Portereb188d02005-11-07 01:00:17 -0800200}
201
202/**
203 * rio_clear_locks- Release all host locks and signal enumeration complete
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700204 * @net: RIO network to run on
Matt Portereb188d02005-11-07 01:00:17 -0800205 *
206 * Marks the component tag CSR on each device with the enumeration
207 * complete flag. When complete, it then release the host locks on
208 * each device. Returns 0 on success or %-EINVAL on failure.
209 */
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700210static int rio_clear_locks(struct rio_net *net)
Matt Portereb188d02005-11-07 01:00:17 -0800211{
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700212 struct rio_mport *port = net->hport;
Matt Portereb188d02005-11-07 01:00:17 -0800213 struct rio_dev *rdev;
214 u32 result;
215 int ret = 0;
216
Matt Portereb188d02005-11-07 01:00:17 -0800217 /* Release host device id locks */
218 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
219 port->host_deviceid);
220 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
221 if ((result & 0xffff) != 0xffff) {
222 printk(KERN_INFO
223 "RIO: badness when releasing host lock on master port, result %8.8x\n",
224 result);
225 ret = -EINVAL;
226 }
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700227 list_for_each_entry(rdev, &net->devices, net_list) {
Matt Portereb188d02005-11-07 01:00:17 -0800228 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
229 port->host_deviceid);
230 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
231 if ((result & 0xffff) != 0xffff) {
232 printk(KERN_INFO
233 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
234 rdev->vid, rdev->did);
235 ret = -EINVAL;
236 }
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700237
238 /* Mark device as discovered and enable master */
239 rio_read_config_32(rdev,
240 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
241 &result);
242 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
243 rio_write_config_32(rdev,
244 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
245 result);
Matt Portereb188d02005-11-07 01:00:17 -0800246 }
247
248 return ret;
249}
250
251/**
252 * rio_enum_host- Set host lock and initialize host destination ID
253 * @port: Master port to issue transaction
254 *
255 * Sets the local host master port lock and destination ID register
256 * with the host device ID value. The host device ID value is provided
257 * by the platform. Returns %0 on success or %-1 on failure.
258 */
259static int rio_enum_host(struct rio_mport *port)
260{
261 u32 result;
262
263 /* Set master port host device id lock */
264 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
265 port->host_deviceid);
266
267 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
268 if ((result & 0xffff) != port->host_deviceid)
269 return -1;
270
271 /* Set master port destid and init destid ctr */
272 rio_local_set_device_id(port, port->host_deviceid);
Matt Portereb188d02005-11-07 01:00:17 -0800273 return 0;
274}
275
276/**
277 * rio_device_has_destid- Test if a device contains a destination ID register
278 * @port: Master port to issue transaction
279 * @src_ops: RIO device source operations
280 * @dst_ops: RIO device destination operations
281 *
282 * Checks the provided @src_ops and @dst_ops for the necessary transaction
283 * capabilities that indicate whether or not a device will implement a
284 * destination ID register. Returns 1 if true or 0 if false.
285 */
286static int rio_device_has_destid(struct rio_mport *port, int src_ops,
287 int dst_ops)
288{
Matt Porterfa78cc52005-11-07 01:00:18 -0800289 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;
290
291 return !!((src_ops | dst_ops) & mask);
Matt Portereb188d02005-11-07 01:00:17 -0800292}
293
294/**
295 * rio_release_dev- Frees a RIO device struct
296 * @dev: LDM device associated with a RIO device struct
297 *
298 * Gets the RIO device struct associated a RIO device struct.
299 * The RIO device struct is freed.
300 */
301static void rio_release_dev(struct device *dev)
302{
303 struct rio_dev *rdev;
304
305 rdev = to_rio_dev(dev);
306 kfree(rdev);
307}
308
309/**
310 * rio_is_switch- Tests if a RIO device has switch capabilities
311 * @rdev: RIO device
312 *
313 * Gets the RIO device Processing Element Features register
314 * contents and tests for switch capabilities. Returns 1 if
315 * the device is a switch or 0 if it is not a switch.
316 * The RIO device struct is freed.
317 */
318static int rio_is_switch(struct rio_dev *rdev)
319{
320 if (rdev->pef & RIO_PEF_SWITCH)
321 return 1;
322 return 0;
323}
324
325/**
Matt Portereb188d02005-11-07 01:00:17 -0800326 * rio_setup_device- Allocates and sets up a RIO device
327 * @net: RIO network
328 * @port: Master port to send transactions
329 * @destid: Current destination ID
330 * @hopcount: Current hopcount
331 * @do_enum: Enumeration/Discovery mode flag
332 *
333 * Allocates a RIO device and configures fields based on configuration
334 * space contents. If device has a destination ID register, a destination
335 * ID is either assigned in enumeration mode or read from configuration
336 * space in discovery mode. If the device has switch capabilities, then
337 * a switch is allocated and configured appropriately. Returns a pointer
338 * to a RIO device on success or NULL on failure.
339 *
340 */
Bill Pemberton305c8912012-11-19 13:23:25 -0500341static struct rio_dev *rio_setup_device(struct rio_net *net,
Matt Portereb188d02005-11-07 01:00:17 -0800342 struct rio_mport *port, u16 destid,
343 u8 hopcount, int do_enum)
344{
Yang Li5f28c522009-05-11 22:36:02 +0000345 int ret = 0;
Matt Portereb188d02005-11-07 01:00:17 -0800346 struct rio_dev *rdev;
Yang Li5f28c522009-05-11 22:36:02 +0000347 struct rio_switch *rswitch = NULL;
Matt Portereb188d02005-11-07 01:00:17 -0800348 int result, rdid;
Alexandre Bounineded05782011-01-12 17:00:39 -0800349 size_t size;
350 u32 swpinfo = 0;
Matt Portereb188d02005-11-07 01:00:17 -0800351
Alexandre Bounineded05782011-01-12 17:00:39 -0800352 size = sizeof(struct rio_dev);
353 if (rio_mport_read_config_32(port, destid, hopcount,
354 RIO_PEF_CAR, &result))
355 return NULL;
356
357 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
358 rio_mport_read_config_32(port, destid, hopcount,
359 RIO_SWP_INFO_CAR, &swpinfo);
360 if (result & RIO_PEF_SWITCH) {
361 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
362 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
363 }
364 }
365
366 rdev = kzalloc(size, GFP_KERNEL);
Matt Portereb188d02005-11-07 01:00:17 -0800367 if (!rdev)
Yang Li5f28c522009-05-11 22:36:02 +0000368 return NULL;
Matt Portereb188d02005-11-07 01:00:17 -0800369
Matt Portereb188d02005-11-07 01:00:17 -0800370 rdev->net = net;
Alexandre Bounineded05782011-01-12 17:00:39 -0800371 rdev->pef = result;
372 rdev->swpinfo = swpinfo;
Matt Portereb188d02005-11-07 01:00:17 -0800373 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
374 &result);
375 rdev->did = result >> 16;
376 rdev->vid = result & 0xffff;
377 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
378 &rdev->device_rev);
379 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
380 &result);
381 rdev->asm_did = result >> 16;
382 rdev->asm_vid = result & 0xffff;
383 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
384 &result);
385 rdev->asm_rev = result >> 16;
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700386 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
Matt Portereb188d02005-11-07 01:00:17 -0800387 rdev->efptr = result & 0xffff;
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700388 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
389 hopcount);
390
391 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
392 hopcount, RIO_EFB_ERR_MGMNT);
393 }
Matt Portereb188d02005-11-07 01:00:17 -0800394
395 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
396 &rdev->src_ops);
397 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
398 &rdev->dst_ops);
399
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700400 if (do_enum) {
401 /* Assign component tag to device */
402 if (next_comptag >= 0x10000) {
403 pr_err("RIO: Component Tag Counter Overflow\n");
404 goto cleanup;
405 }
406 rio_mport_write_config_32(port, destid, hopcount,
407 RIO_COMPONENT_TAG_CSR, next_comptag);
408 rdev->comp_tag = next_comptag++;
Alexandre Bounine2ec3ba62013-07-03 15:08:50 -0700409 rdev->do_enum = true;
Alexandre Bounine558bda62011-01-12 17:00:42 -0800410 } else {
411 rio_mport_read_config_32(port, destid, hopcount,
412 RIO_COMPONENT_TAG_CSR,
413 &rdev->comp_tag);
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700414 }
415
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800416 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
417 if (do_enum) {
418 rio_set_device_id(port, destid, hopcount, next_destid);
Alexandre Bouninede74e002012-10-04 17:16:13 -0700419 rdev->destid = next_destid;
420 next_destid = rio_destid_alloc(net);
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800421 } else
422 rdev->destid = rio_get_device_id(port, destid, hopcount);
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800423
424 rdev->hopcount = 0xff;
425 } else {
426 /* Switch device has an associated destID which
427 * will be adjusted later
428 */
429 rdev->destid = destid;
430 rdev->hopcount = hopcount;
431 }
Matt Portereb188d02005-11-07 01:00:17 -0800432
433 /* If a PE has both switch and other functions, show it as a switch */
434 if (rio_is_switch(rdev)) {
Alexandre Bounineded05782011-01-12 17:00:39 -0800435 rswitch = rdev->rswitch;
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700436 rswitch->port_ok = 0;
Alexandre Bounine2ec3ba62013-07-03 15:08:50 -0700437 spin_lock_init(&rswitch->lock);
Zhang Weie0423232008-04-18 13:33:42 -0700438 rswitch->route_table = kzalloc(sizeof(u8)*
439 RIO_MAX_ROUTE_ENTRIES(port->sys_size),
440 GFP_KERNEL);
Yang Li5f28c522009-05-11 22:36:02 +0000441 if (!rswitch->route_table)
442 goto cleanup;
Matt Portereb188d02005-11-07 01:00:17 -0800443 /* Initialize switch route table */
Zhang Weie0423232008-04-18 13:33:42 -0700444 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
445 rdid++)
Matt Portereb188d02005-11-07 01:00:17 -0800446 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
Kay Sieversb53c75832008-12-04 10:01:52 -0800447 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
Alexandre Bounine6ca40c22013-07-03 15:09:01 -0700448 rdev->comp_tag & RIO_CTAG_UDEVID);
Matt Portereb188d02005-11-07 01:00:17 -0800449
Alexandre Bounine2ec3ba62013-07-03 15:08:50 -0700450 if (do_enum)
451 rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0);
Alexandre Bounine07590ff2010-05-26 14:43:57 -0700452
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700453 list_add_tail(&rswitch->node, &net->switches);
Matt Portereb188d02005-11-07 01:00:17 -0800454
Thomas Moll933af4a2010-05-26 14:44:01 -0700455 } else {
456 if (do_enum)
457 /*Enable Input Output Port (transmitter reviever)*/
458 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
459
Kay Sieversb53c75832008-12-04 10:01:52 -0800460 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
Alexandre Bounine6ca40c22013-07-03 15:09:01 -0700461 rdev->comp_tag & RIO_CTAG_UDEVID);
Thomas Moll933af4a2010-05-26 14:44:01 -0700462 }
Matt Portereb188d02005-11-07 01:00:17 -0800463
Alexandre Bounine2aaf3082014-04-07 15:38:56 -0700464 rdev->dev.parent = &port->dev;
Alexandre Bouninea11650e2013-05-24 15:55:05 -0700465 rio_attach_device(rdev);
Matt Portereb188d02005-11-07 01:00:17 -0800466
467 device_initialize(&rdev->dev);
468 rdev->dev.release = rio_release_dev;
469 rio_dev_get(rdev);
470
Yang Hongyang284901a2009-04-06 19:01:15 -0700471 rdev->dma_mask = DMA_BIT_MASK(32);
Matt Porterfa78cc52005-11-07 01:00:18 -0800472 rdev->dev.dma_mask = &rdev->dma_mask;
Yang Hongyang284901a2009-04-06 19:01:15 -0700473 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
Matt Portereb188d02005-11-07 01:00:17 -0800474
Alexandre Bounine284fb682011-08-25 15:59:13 -0700475 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
Matt Portereb188d02005-11-07 01:00:17 -0800476 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
477 0, 0xffff);
478
Yang Li5f28c522009-05-11 22:36:02 +0000479 ret = rio_add_device(rdev);
480 if (ret)
481 goto cleanup;
Matt Portereb188d02005-11-07 01:00:17 -0800482
Matt Portereb188d02005-11-07 01:00:17 -0800483 return rdev;
Yang Li5f28c522009-05-11 22:36:02 +0000484
485cleanup:
Alexandre Bounine166c0502011-11-02 13:39:11 -0700486 if (rswitch)
Yang Li5f28c522009-05-11 22:36:02 +0000487 kfree(rswitch->route_table);
Alexandre Bounineded05782011-01-12 17:00:39 -0800488
Yang Li5f28c522009-05-11 22:36:02 +0000489 kfree(rdev);
490 return NULL;
Matt Portereb188d02005-11-07 01:00:17 -0800491}
492
493/**
494 * rio_sport_is_active- Tests if a switch port has an active connection.
495 * @port: Master port to send transaction
496 * @destid: Associated destination ID for switch
497 * @hopcount: Hopcount to reach switch
498 * @sport: Switch port number
499 *
500 * Reads the port error status CSR for a particular switch port to
501 * determine if the port has an active link. Returns
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700502 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
Matt Portereb188d02005-11-07 01:00:17 -0800503 * inactive.
504 */
505static int
506rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
507{
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700508 u32 result = 0;
Matt Portereb188d02005-11-07 01:00:17 -0800509 u32 ext_ftr_ptr;
510
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700511 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
Matt Portereb188d02005-11-07 01:00:17 -0800512
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700513 while (ext_ftr_ptr) {
514 rio_mport_read_config_32(port, destid, hopcount,
515 ext_ftr_ptr, &result);
516 result = RIO_GET_BLOCK_ID(result);
517 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
518 (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
519 (result == RIO_EFB_SER_EP_FREC_ID))
Matt Portereb188d02005-11-07 01:00:17 -0800520 break;
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700521
522 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
523 ext_ftr_ptr);
524 }
Matt Portereb188d02005-11-07 01:00:17 -0800525
526 if (ext_ftr_ptr)
527 rio_mport_read_config_32(port, destid, hopcount,
528 ext_ftr_ptr +
529 RIO_PORT_N_ERR_STS_CSR(sport),
530 &result);
531
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700532 return result & RIO_PORT_N_ERR_STS_PORT_OK;
Matt Portereb188d02005-11-07 01:00:17 -0800533}
534
535/**
Matt Portereb188d02005-11-07 01:00:17 -0800536 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
537 * @port: Master port to send transaction
538 * @hopcount: Number of hops to the device
539 *
540 * Used during enumeration to read the Host Device ID Lock CSR on a
541 * RIO device. Returns the value of the lock register.
542 */
543static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
544{
545 u32 result;
546
Zhang Weie0423232008-04-18 13:33:42 -0700547 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
Matt Portereb188d02005-11-07 01:00:17 -0800548 RIO_HOST_DID_LOCK_CSR, &result);
549
550 return (u16) (result & 0xffff);
551}
552
553/**
Matt Portereb188d02005-11-07 01:00:17 -0800554 * rio_enum_peer- Recursively enumerate a RIO network through a master port
555 * @net: RIO network being enumerated
556 * @port: Master port to send transactions
557 * @hopcount: Number of hops into the network
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700558 * @prev: Previous RIO device connected to the enumerated one
559 * @prev_port: Port on previous RIO device
Matt Portereb188d02005-11-07 01:00:17 -0800560 *
561 * Recursively enumerates a RIO network. Transactions are sent via the
562 * master port passed in @port.
563 */
Bill Pemberton305c8912012-11-19 13:23:25 -0500564static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700565 u8 hopcount, struct rio_dev *prev, int prev_port)
Matt Portereb188d02005-11-07 01:00:17 -0800566{
Matt Portereb188d02005-11-07 01:00:17 -0800567 struct rio_dev *rdev;
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700568 u32 regval;
Matt Portereb188d02005-11-07 01:00:17 -0800569 int tmp;
570
Alexandre Bouninee274e0e2010-10-27 15:34:32 -0700571 if (rio_mport_chk_dev_access(port,
572 RIO_ANY_DESTID(port->sys_size), hopcount)) {
573 pr_debug("RIO: device access check failed\n");
574 return -1;
575 }
576
Matt Portereb188d02005-11-07 01:00:17 -0800577 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
578 pr_debug("RIO: PE already discovered by this host\n");
579 /*
580 * Already discovered by this host. Add it as another
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700581 * link to the existing device.
Matt Portereb188d02005-11-07 01:00:17 -0800582 */
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700583 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
584 hopcount, RIO_COMPONENT_TAG_CSR, &regval);
585
586 if (regval) {
587 rdev = rio_get_comptag((regval & 0xffff), NULL);
588
589 if (rdev && prev && rio_is_switch(prev)) {
590 pr_debug("RIO: redundant path to %s\n",
591 rio_name(rdev));
592 prev->rswitch->nextdev[prev_port] = rdev;
593 }
594 }
595
Matt Portereb188d02005-11-07 01:00:17 -0800596 return 0;
597 }
598
599 /* Attempt to acquire device lock */
Zhang Weie0423232008-04-18 13:33:42 -0700600 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
601 hopcount,
Matt Portereb188d02005-11-07 01:00:17 -0800602 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
603 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
604 < port->host_deviceid) {
605 /* Delay a bit */
606 mdelay(1);
607 /* Attempt to acquire device lock again */
Zhang Weie0423232008-04-18 13:33:42 -0700608 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
609 hopcount,
Matt Portereb188d02005-11-07 01:00:17 -0800610 RIO_HOST_DID_LOCK_CSR,
611 port->host_deviceid);
612 }
613
614 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
615 pr_debug(
616 "RIO: PE locked by a higher priority host...retreating\n");
617 return -1;
618 }
619
620 /* Setup new RIO device */
Zhang Weie0423232008-04-18 13:33:42 -0700621 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
622 hopcount, 1);
623 if (rdev) {
Matt Portereb188d02005-11-07 01:00:17 -0800624 /* Add device to the global and bus/net specific list. */
625 list_add_tail(&rdev->net_list, &net->devices);
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700626 rdev->prev = prev;
627 if (prev && rio_is_switch(prev))
628 prev->rswitch->nextdev[prev_port] = rdev;
Matt Portereb188d02005-11-07 01:00:17 -0800629 } else
630 return -1;
631
632 if (rio_is_switch(rdev)) {
Alexandre Bouninede74e002012-10-04 17:16:13 -0700633 int sw_destid;
634 int cur_destid;
635 int sw_inport;
636 u16 destid;
637 int port_num;
638
Alexandre Bounineae05cbd2010-10-27 15:34:29 -0700639 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800640 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700641 port->host_deviceid, sw_inport, 0);
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800642 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
Matt Portereb188d02005-11-07 01:00:17 -0800643
Alexandre Bouninede74e002012-10-04 17:16:13 -0700644 destid = rio_destid_first(net);
645 while (destid != RIO_INVALID_DESTID && destid < next_destid) {
646 if (destid != port->host_deviceid) {
647 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
648 destid, sw_inport, 0);
649 rdev->rswitch->route_table[destid] = sw_inport;
650 }
651 destid = rio_destid_next(net, destid + 1);
Matt Portereb188d02005-11-07 01:00:17 -0800652 }
Matt Portereb188d02005-11-07 01:00:17 -0800653 pr_debug(
654 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700655 rio_name(rdev), rdev->vid, rdev->did,
656 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800657 sw_destid = next_destid;
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700658 for (port_num = 0;
659 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
660 port_num++) {
Alexandre Bounine8d4630d2012-10-04 17:16:02 -0700661 if (sw_inport == port_num) {
662 rio_enable_rx_tx_port(port, 0,
Thomas Moll933af4a2010-05-26 14:44:01 -0700663 RIO_ANY_DESTID(port->sys_size),
664 hopcount, port_num);
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700665 rdev->rswitch->port_ok |= (1 << port_num);
Matt Portereb188d02005-11-07 01:00:17 -0800666 continue;
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700667 }
Matt Portereb188d02005-11-07 01:00:17 -0800668
669 cur_destid = next_destid;
670
671 if (rio_sport_is_active
Zhang Weie0423232008-04-18 13:33:42 -0700672 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
673 port_num)) {
Matt Portereb188d02005-11-07 01:00:17 -0800674 pr_debug(
675 "RIO: scanning device on port %d\n",
676 port_num);
Alexandre Bounine8d4630d2012-10-04 17:16:02 -0700677 rio_enable_rx_tx_port(port, 0,
678 RIO_ANY_DESTID(port->sys_size),
679 hopcount, port_num);
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700680 rdev->rswitch->port_ok |= (1 << port_num);
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800681 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
Zhang Weie0423232008-04-18 13:33:42 -0700682 RIO_ANY_DESTID(port->sys_size),
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700683 port_num, 0);
Matt Portereb188d02005-11-07 01:00:17 -0800684
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700685 if (rio_enum_peer(net, port, hopcount + 1,
686 rdev, port_num) < 0)
Matt Portereb188d02005-11-07 01:00:17 -0800687 return -1;
688
689 /* Update routing tables */
Alexandre Bouninede74e002012-10-04 17:16:13 -0700690 destid = rio_destid_next(net, cur_destid + 1);
691 if (destid != RIO_INVALID_DESTID) {
Matt Portereb188d02005-11-07 01:00:17 -0800692 for (destid = cur_destid;
Alexandre Bouninede74e002012-10-04 17:16:13 -0700693 destid < next_destid;) {
694 if (destid != port->host_deviceid) {
695 rio_route_add_entry(rdev,
Matt Portereb188d02005-11-07 01:00:17 -0800696 RIO_GLOBAL_TABLE,
697 destid,
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700698 port_num,
699 0);
Alexandre Bouninede74e002012-10-04 17:16:13 -0700700 rdev->rswitch->
701 route_table[destid] =
702 port_num;
703 }
704 destid = rio_destid_next(net,
705 destid + 1);
Matt Portereb188d02005-11-07 01:00:17 -0800706 }
Matt Portereb188d02005-11-07 01:00:17 -0800707 }
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700708 } else {
709 /* If switch supports Error Management,
710 * set PORT_LOCKOUT bit for unused port
711 */
712 if (rdev->em_efptr)
713 rio_set_port_lockout(rdev, port_num, 1);
714
715 rdev->rswitch->port_ok &= ~(1 << port_num);
Matt Portereb188d02005-11-07 01:00:17 -0800716 }
717 }
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800718
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700719 /* Direct Port-write messages to the enumeratiing host */
720 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
721 (rdev->em_efptr)) {
722 rio_write_config_32(rdev,
723 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
724 (port->host_deviceid << 16) |
725 (port->sys_size << 15));
726 }
727
728 rio_init_em(rdev);
729
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800730 /* Check for empty switch */
Alexandre Bouninede74e002012-10-04 17:16:13 -0700731 if (next_destid == sw_destid)
732 next_destid = rio_destid_alloc(net);
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800733
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800734 rdev->destid = sw_destid;
Matt Portereb188d02005-11-07 01:00:17 -0800735 } else
736 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
737 rio_name(rdev), rdev->vid, rdev->did);
738
739 return 0;
740}
741
742/**
743 * rio_enum_complete- Tests if enumeration of a network is complete
744 * @port: Master port to send transaction
745 *
Liu Ganga5712592011-11-02 13:39:05 -0700746 * Tests the PGCCSR discovered bit for non-zero value (enumeration
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700747 * complete flag). Return %1 if enumeration is complete or %0 if
Matt Portereb188d02005-11-07 01:00:17 -0800748 * enumeration is incomplete.
749 */
750static int rio_enum_complete(struct rio_mport *port)
751{
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700752 u32 regval;
Matt Portereb188d02005-11-07 01:00:17 -0800753
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700754 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
755 &regval);
Liu Ganga5712592011-11-02 13:39:05 -0700756 return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
Matt Portereb188d02005-11-07 01:00:17 -0800757}
758
759/**
760 * rio_disc_peer- Recursively discovers a RIO network through a master port
761 * @net: RIO network being discovered
762 * @port: Master port to send transactions
763 * @destid: Current destination ID in network
764 * @hopcount: Number of hops into the network
Randy Dunlap9b310ac2011-01-22 20:16:12 -0800765 * @prev: previous rio_dev
766 * @prev_port: previous port number
Matt Portereb188d02005-11-07 01:00:17 -0800767 *
768 * Recursively discovers a RIO network. Transactions are sent via the
769 * master port passed in @port.
770 */
Bill Pemberton305c8912012-11-19 13:23:25 -0500771static int
Matt Portereb188d02005-11-07 01:00:17 -0800772rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
Alexandre Bounine17e96202011-01-12 17:00:41 -0800773 u8 hopcount, struct rio_dev *prev, int prev_port)
Matt Portereb188d02005-11-07 01:00:17 -0800774{
775 u8 port_num, route_port;
Matt Portereb188d02005-11-07 01:00:17 -0800776 struct rio_dev *rdev;
777 u16 ndestid;
778
779 /* Setup new RIO device */
780 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
781 /* Add device to the global and bus/net specific list. */
782 list_add_tail(&rdev->net_list, &net->devices);
Alexandre Bounine17e96202011-01-12 17:00:41 -0800783 rdev->prev = prev;
784 if (prev && rio_is_switch(prev))
785 prev->rswitch->nextdev[prev_port] = rdev;
Matt Portereb188d02005-11-07 01:00:17 -0800786 } else
787 return -1;
788
789 if (rio_is_switch(rdev)) {
Matt Portereb188d02005-11-07 01:00:17 -0800790 /* Associated destid is how we accessed this switch */
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800791 rdev->destid = destid;
Matt Portereb188d02005-11-07 01:00:17 -0800792
Matt Portereb188d02005-11-07 01:00:17 -0800793 pr_debug(
794 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700795 rio_name(rdev), rdev->vid, rdev->did,
796 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
797 for (port_num = 0;
798 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
799 port_num++) {
Alexandre Bounineae05cbd2010-10-27 15:34:29 -0700800 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
Matt Portereb188d02005-11-07 01:00:17 -0800801 continue;
802
803 if (rio_sport_is_active
804 (port, destid, hopcount, port_num)) {
805 pr_debug(
806 "RIO: scanning device on port %d\n",
807 port_num);
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700808
809 rio_lock_device(port, destid, hopcount, 1000);
810
Zhang Weie0423232008-04-18 13:33:42 -0700811 for (ndestid = 0;
812 ndestid < RIO_ANY_DESTID(port->sys_size);
Matt Portereb188d02005-11-07 01:00:17 -0800813 ndestid++) {
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800814 rio_route_get_entry(rdev,
Matt Portereb188d02005-11-07 01:00:17 -0800815 RIO_GLOBAL_TABLE,
816 ndestid,
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700817 &route_port, 0);
Matt Portereb188d02005-11-07 01:00:17 -0800818 if (route_port == port_num)
819 break;
820 }
821
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700822 if (ndestid == RIO_ANY_DESTID(port->sys_size))
823 continue;
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700824 rio_unlock_device(port, destid, hopcount);
Alexandre Bounine17e96202011-01-12 17:00:41 -0800825 if (rio_disc_peer(net, port, ndestid,
826 hopcount + 1, rdev, port_num) < 0)
Matt Portereb188d02005-11-07 01:00:17 -0800827 return -1;
828 }
829 }
830 } else
831 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
832 rio_name(rdev), rdev->vid, rdev->did);
833
834 return 0;
835}
836
837/**
838 * rio_mport_is_active- Tests if master port link is active
839 * @port: Master port to test
840 *
841 * Reads the port error status CSR for the master port to
842 * determine if the port has an active link. Returns
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700843 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
Matt Portereb188d02005-11-07 01:00:17 -0800844 * or %0 if it is inactive.
845 */
846static int rio_mport_is_active(struct rio_mport *port)
847{
848 u32 result = 0;
849 u32 ext_ftr_ptr;
850 int *entry = rio_mport_phys_table;
851
852 do {
853 if ((ext_ftr_ptr =
854 rio_mport_get_feature(port, 1, 0, 0, *entry)))
855 break;
856 } while (*++entry >= 0);
857
858 if (ext_ftr_ptr)
859 rio_local_read_config_32(port,
860 ext_ftr_ptr +
861 RIO_PORT_N_ERR_STS_CSR(port->index),
862 &result);
863
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700864 return result & RIO_PORT_N_ERR_STS_PORT_OK;
Matt Portereb188d02005-11-07 01:00:17 -0800865}
866
867/**
868 * rio_alloc_net- Allocate and configure a new RIO network
869 * @port: Master port associated with the RIO network
Alexandre Bouninede74e002012-10-04 17:16:13 -0700870 * @do_enum: Enumeration/Discovery mode flag
871 * @start: logical minimal start id for new net
Matt Portereb188d02005-11-07 01:00:17 -0800872 *
873 * Allocates a RIO network structure, initializes per-network
874 * list heads, and adds the associated master port to the
875 * network list of associated master ports. Returns a
876 * RIO network pointer on success or %NULL on failure.
877 */
Bill Pemberton305c8912012-11-19 13:23:25 -0500878static struct rio_net *rio_alloc_net(struct rio_mport *port,
Alexandre Bouninede74e002012-10-04 17:16:13 -0700879 int do_enum, u16 start)
Matt Portereb188d02005-11-07 01:00:17 -0800880{
881 struct rio_net *net;
882
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700883 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
Alexandre Bouninede74e002012-10-04 17:16:13 -0700884 if (net && do_enum) {
Alexandre Bounine4ed134b2012-10-10 15:54:01 -0700885 net->destid_table.table = kcalloc(
886 BITS_TO_LONGS(RIO_MAX_ROUTE_ENTRIES(port->sys_size)),
Alexandre Bouninede74e002012-10-04 17:16:13 -0700887 sizeof(long),
888 GFP_KERNEL);
889
890 if (net->destid_table.table == NULL) {
891 pr_err("RIO: failed to allocate destID table\n");
892 kfree(net);
893 net = NULL;
894 } else {
895 net->destid_table.start = start;
Alexandre Bouninede74e002012-10-04 17:16:13 -0700896 net->destid_table.max =
897 RIO_MAX_ROUTE_ENTRIES(port->sys_size);
898 spin_lock_init(&net->destid_table.lock);
899 }
900 }
901
Matt Portereb188d02005-11-07 01:00:17 -0800902 if (net) {
Matt Portereb188d02005-11-07 01:00:17 -0800903 INIT_LIST_HEAD(&net->node);
904 INIT_LIST_HEAD(&net->devices);
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700905 INIT_LIST_HEAD(&net->switches);
Matt Portereb188d02005-11-07 01:00:17 -0800906 INIT_LIST_HEAD(&net->mports);
907 list_add_tail(&port->nnode, &net->mports);
908 net->hport = port;
Alexandre Bounine005842e2012-10-04 17:16:08 -0700909 net->id = port->id;
Matt Portereb188d02005-11-07 01:00:17 -0800910 }
911 return net;
912}
913
914/**
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800915 * rio_update_route_tables- Updates route tables in switches
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700916 * @net: RIO network to run update on
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800917 *
918 * For each enumerated device, ensure that each switch in a system
919 * has correct routing entries. Add routes for devices that where
920 * unknown dirung the first enumeration pass through the switch.
921 */
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700922static void rio_update_route_tables(struct rio_net *net)
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800923{
Alexandre Bounineded05782011-01-12 17:00:39 -0800924 struct rio_dev *rdev, *swrdev;
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800925 struct rio_switch *rswitch;
926 u8 sport;
927 u16 destid;
928
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700929 list_for_each_entry(rdev, &net->devices, net_list) {
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800930
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800931 destid = rdev->destid;
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800932
Alexandre Bouninea7071ef2012-10-04 17:16:05 -0700933 list_for_each_entry(rswitch, &net->switches, node) {
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800934
935 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
936 continue;
937
938 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
Alexandre Bounineded05782011-01-12 17:00:39 -0800939 swrdev = sw_to_rio_dev(rswitch);
940
Alexandre Bounine07590ff2010-05-26 14:43:57 -0700941 /* Skip if destid ends in empty switch*/
Alexandre Bounineded05782011-01-12 17:00:39 -0800942 if (swrdev->destid == destid)
Alexandre Bounine07590ff2010-05-26 14:43:57 -0700943 continue;
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800944
Alexandre Bounineded05782011-01-12 17:00:39 -0800945 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800946
Alexandre Bounine2ec3ba62013-07-03 15:08:50 -0700947 rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE,
948 destid, sport, 0);
949 rswitch->route_table[destid] = sport;
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800950 }
951 }
952 }
953}
954
955/**
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700956 * rio_init_em - Initializes RIO Error Management (for switches)
Randy Dunlap97ef6f72010-05-28 15:08:08 -0700957 * @rdev: RIO device
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700958 *
959 * For each enumerated switch, call device-specific error management
960 * initialization routine (if supplied by the switch driver).
961 */
962static void rio_init_em(struct rio_dev *rdev)
963{
964 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
Alexandre Bounine2ec3ba62013-07-03 15:08:50 -0700965 rdev->rswitch->ops && rdev->rswitch->ops->em_init) {
966 rdev->rswitch->ops->em_init(rdev);
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700967 }
968}
969
970/**
971 * rio_pw_enable - Enables/disables port-write handling by a master port
972 * @port: Master port associated with port-write handling
973 * @enable: 1=enable, 0=disable
974 */
975static void rio_pw_enable(struct rio_mport *port, int enable)
976{
977 if (port->ops->pwenable)
978 port->ops->pwenable(port, enable);
979}
980
981/**
Matt Portereb188d02005-11-07 01:00:17 -0800982 * rio_enum_mport- Start enumeration through a master port
983 * @mport: Master port to send transactions
Alexandre Bouninebc8fcfe2013-05-24 15:55:06 -0700984 * @flags: Enumeration control flags
Matt Portereb188d02005-11-07 01:00:17 -0800985 *
986 * Starts the enumeration process. If somebody has enumerated our
987 * master port device, then give up. If not and we have an active
988 * link, then start recursive peer enumeration. Returns %0 if
989 * enumeration succeeds or %-EBUSY if enumeration fails.
990 */
Wu Fengguang36f0efb2013-07-03 15:08:49 -0700991static int rio_enum_mport(struct rio_mport *mport, u32 flags)
Matt Portereb188d02005-11-07 01:00:17 -0800992{
993 struct rio_net *net = NULL;
994 int rc = 0;
995
996 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
997 mport->name);
Alexandre Bouninebc8fcfe2013-05-24 15:55:06 -0700998
999 /*
1000 * To avoid multiple start requests (repeat enumeration is not supported
1001 * by this method) check if enumeration/discovery was performed for this
1002 * mport: if mport was added into the list of mports for a net exit
1003 * with error.
1004 */
1005 if (mport->nnode.next || mport->nnode.prev)
1006 return -EBUSY;
1007
Matt Portereb188d02005-11-07 01:00:17 -08001008 /* If somebody else enumerated our master port device, bail. */
1009 if (rio_enum_host(mport) < 0) {
1010 printk(KERN_INFO
1011 "RIO: master port %d device has been enumerated by a remote host\n",
1012 mport->id);
1013 rc = -EBUSY;
1014 goto out;
1015 }
1016
1017 /* If master port has an active link, allocate net and enum peers */
1018 if (rio_mport_is_active(mport)) {
Alexandre Bouninede74e002012-10-04 17:16:13 -07001019 net = rio_alloc_net(mport, 1, 0);
1020 if (!net) {
Matt Portereb188d02005-11-07 01:00:17 -08001021 printk(KERN_ERR "RIO: failed to allocate new net\n");
1022 rc = -ENOMEM;
1023 goto out;
1024 }
Thomas Moll933af4a2010-05-26 14:44:01 -07001025
Alexandre Bouninede74e002012-10-04 17:16:13 -07001026 /* reserve mport destID in new net */
1027 rio_destid_reserve(net, mport->host_deviceid);
1028
Thomas Moll933af4a2010-05-26 14:44:01 -07001029 /* Enable Input Output Port (transmitter reviever) */
1030 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1031
Alexandre Bounineaf84ca32010-10-27 15:34:34 -07001032 /* Set component tag for host */
1033 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1034 next_comptag++);
1035
Alexandre Bouninede74e002012-10-04 17:16:13 -07001036 next_destid = rio_destid_alloc(net);
1037
Alexandre Bounine68fe4df2010-10-27 15:34:29 -07001038 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
Matt Portereb188d02005-11-07 01:00:17 -08001039 /* A higher priority host won enumeration, bail. */
1040 printk(KERN_INFO
1041 "RIO: master port %d device has lost enumeration to a remote host\n",
1042 mport->id);
Alexandre Bouninea7071ef2012-10-04 17:16:05 -07001043 rio_clear_locks(net);
Matt Portereb188d02005-11-07 01:00:17 -08001044 rc = -EBUSY;
1045 goto out;
1046 }
Alexandre Bouninede74e002012-10-04 17:16:13 -07001047 /* free the last allocated destID (unused) */
1048 rio_destid_free(net, next_destid);
Alexandre Bouninea7071ef2012-10-04 17:16:05 -07001049 rio_update_route_tables(net);
1050 rio_clear_locks(net);
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -07001051 rio_pw_enable(mport, 1);
Matt Portereb188d02005-11-07 01:00:17 -08001052 } else {
1053 printk(KERN_INFO "RIO: master port %d link inactive\n",
1054 mport->id);
1055 rc = -EINVAL;
1056 }
1057
1058 out:
1059 return rc;
1060}
1061
1062/**
1063 * rio_build_route_tables- Generate route tables from switch route entries
Alexandre Bouninea7071ef2012-10-04 17:16:05 -07001064 * @net: RIO network to run route tables scan on
Matt Portereb188d02005-11-07 01:00:17 -08001065 *
1066 * For each switch device, generate a route table by copying existing
1067 * route entries from the switch.
1068 */
Alexandre Bouninea7071ef2012-10-04 17:16:05 -07001069static void rio_build_route_tables(struct rio_net *net)
Matt Portereb188d02005-11-07 01:00:17 -08001070{
Alexandre Bouninea7071ef2012-10-04 17:16:05 -07001071 struct rio_switch *rswitch;
Matt Portereb188d02005-11-07 01:00:17 -08001072 struct rio_dev *rdev;
1073 int i;
1074 u8 sport;
1075
Alexandre Bouninea7071ef2012-10-04 17:16:05 -07001076 list_for_each_entry(rswitch, &net->switches, node) {
1077 rdev = sw_to_rio_dev(rswitch);
Alexandre Bounine818a04a2010-05-26 14:43:58 -07001078
Alexandre Bouninea7071ef2012-10-04 17:16:05 -07001079 rio_lock_device(net->hport, rdev->destid,
1080 rdev->hopcount, 1000);
1081 for (i = 0;
1082 i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1083 i++) {
1084 if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1085 i, &sport, 0) < 0)
1086 continue;
1087 rswitch->route_table[i] = sport;
Matt Portereb188d02005-11-07 01:00:17 -08001088 }
Alexandre Bouninea7071ef2012-10-04 17:16:05 -07001089
1090 rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1091 }
Matt Portereb188d02005-11-07 01:00:17 -08001092}
1093
1094/**
Matt Portereb188d02005-11-07 01:00:17 -08001095 * rio_disc_mport- Start discovery through a master port
1096 * @mport: Master port to send transactions
Alexandre Bouninebc8fcfe2013-05-24 15:55:06 -07001097 * @flags: discovery control flags
Matt Portereb188d02005-11-07 01:00:17 -08001098 *
1099 * Starts the discovery process. If we have an active link,
Alexandre Bouninebc8fcfe2013-05-24 15:55:06 -07001100 * then wait for the signal that enumeration is complete (if wait
1101 * is allowed).
Matt Portereb188d02005-11-07 01:00:17 -08001102 * When enumeration completion is signaled, start recursive
1103 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1104 * on failure.
1105 */
Wu Fengguang36f0efb2013-07-03 15:08:49 -07001106static int rio_disc_mport(struct rio_mport *mport, u32 flags)
Matt Portereb188d02005-11-07 01:00:17 -08001107{
1108 struct rio_net *net = NULL;
Alexandre Bouninefa3dbaa2012-10-04 17:16:04 -07001109 unsigned long to_end;
Matt Portereb188d02005-11-07 01:00:17 -08001110
1111 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1112 mport->name);
1113
1114 /* If master port has an active link, allocate net and discover peers */
1115 if (rio_mport_is_active(mport)) {
Alexandre Bouninebc8fcfe2013-05-24 15:55:06 -07001116 if (rio_enum_complete(mport))
1117 goto enum_done;
1118 else if (flags & RIO_SCAN_ENUM_NO_WAIT)
1119 return -EAGAIN;
1120
Alexandre Bouninefa3dbaa2012-10-04 17:16:04 -07001121 pr_debug("RIO: wait for enumeration to complete...\n");
1122
1123 to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1124 while (time_before(jiffies, to_end)) {
1125 if (rio_enum_complete(mport))
1126 goto enum_done;
Alexandre Bouninef4c9c0e2012-10-10 15:53:58 -07001127 msleep(10);
Alexandre Bouninefa3dbaa2012-10-04 17:16:04 -07001128 }
1129
1130 pr_debug("RIO: discovery timeout on mport %d %s\n",
1131 mport->id, mport->name);
1132 goto bail;
1133enum_done:
1134 pr_debug("RIO: ... enumeration done\n");
1135
Alexandre Bouninede74e002012-10-04 17:16:13 -07001136 net = rio_alloc_net(mport, 0, 0);
Alexandre Bouninefa3dbaa2012-10-04 17:16:04 -07001137 if (!net) {
Matt Portereb188d02005-11-07 01:00:17 -08001138 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1139 goto bail;
1140 }
1141
Alexandre Bounine818a04a2010-05-26 14:43:58 -07001142 /* Read DestID assigned by enumerator */
1143 rio_local_read_config_32(mport, RIO_DID_CSR,
1144 &mport->host_deviceid);
1145 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1146 mport->host_deviceid);
1147
Zhang Weie0423232008-04-18 13:33:42 -07001148 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
Alexandre Bounine17e96202011-01-12 17:00:41 -08001149 0, NULL, 0) < 0) {
Matt Portereb188d02005-11-07 01:00:17 -08001150 printk(KERN_INFO
1151 "RIO: master port %d device has failed discovery\n",
1152 mport->id);
1153 goto bail;
1154 }
1155
Alexandre Bouninea7071ef2012-10-04 17:16:05 -07001156 rio_build_route_tables(net);
Matt Portereb188d02005-11-07 01:00:17 -08001157 }
1158
1159 return 0;
Alexandre Bouninefa3dbaa2012-10-04 17:16:04 -07001160bail:
Matt Portereb188d02005-11-07 01:00:17 -08001161 return -EBUSY;
1162}
Alexandre Bouninea11650e2013-05-24 15:55:05 -07001163
1164static struct rio_scan rio_scan_ops = {
Alexandre Bounine9edbc30b2013-07-03 15:08:53 -07001165 .owner = THIS_MODULE,
Alexandre Bouninea11650e2013-05-24 15:55:05 -07001166 .enumerate = rio_enum_mport,
1167 .discover = rio_disc_mport,
1168};
1169
1170static bool scan;
1171module_param(scan, bool, 0);
1172MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
1173 "(default = 0)");
1174
1175/**
1176 * rio_basic_attach:
1177 *
1178 * When this enumeration/discovery method is loaded as a module this function
1179 * registers its specific enumeration and discover routines for all available
1180 * RapidIO mport devices. The "scan" command line parameter controls ability of
1181 * the module to start RapidIO enumeration/discovery automatically.
1182 *
1183 * Returns 0 for success or -EIO if unable to register itself.
1184 *
1185 * This enumeration/discovery method cannot be unloaded and therefore does not
1186 * provide a matching cleanup_module routine.
1187 */
1188
1189static int __init rio_basic_attach(void)
1190{
1191 if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
1192 return -EIO;
1193 if (scan)
1194 rio_init_mports();
1195 return 0;
1196}
1197
1198late_initcall(rio_basic_attach);
1199
1200MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
1201MODULE_LICENSE("GPL");