blob: 2bebd791a09243703da9d531eda1cec3ebd0941d [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>
Tim Schmielaude259682006-01-08 01:02:05 -080034#include <linux/jiffies.h>
35#include <linux/slab.h>
Matt Portereb188d02005-11-07 01:00:17 -080036
37#include "rio.h"
38
39LIST_HEAD(rio_devices);
40static LIST_HEAD(rio_switches);
41
Matt Portereb188d02005-11-07 01:00:17 -080042static void rio_enum_timeout(unsigned long);
43
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -070044static void rio_init_em(struct rio_dev *rdev);
45
Matt Porterfa78cc52005-11-07 01:00:18 -080046DEFINE_SPINLOCK(rio_global_list_lock);
47
Matt Portereb188d02005-11-07 01:00:17 -080048static int next_destid = 0;
Matt Portereb188d02005-11-07 01:00:17 -080049static int next_net = 0;
Alexandre Bounineaf84ca32010-10-27 15:34:34 -070050static int next_comptag = 1;
Matt Portereb188d02005-11-07 01:00:17 -080051
52static struct timer_list rio_enum_timer =
53TIMER_INITIALIZER(rio_enum_timeout, 0, 0);
54
55static int rio_mport_phys_table[] = {
56 RIO_EFB_PAR_EP_ID,
57 RIO_EFB_PAR_EP_REC_ID,
58 RIO_EFB_SER_EP_ID,
59 RIO_EFB_SER_EP_REC_ID,
60 -1,
61};
62
Matt Portereb188d02005-11-07 01:00:17 -080063/**
64 * rio_get_device_id - Get the base/extended device id for a device
65 * @port: RIO master port
66 * @destid: Destination ID of device
67 * @hopcount: Hopcount to device
68 *
69 * Reads the base/extended device id from a device. Returns the
70 * 8/16-bit device ID.
71 */
72static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
73{
74 u32 result;
75
76 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
77
Zhang Weie0423232008-04-18 13:33:42 -070078 return RIO_GET_DID(port->sys_size, result);
Matt Portereb188d02005-11-07 01:00:17 -080079}
80
81/**
82 * rio_set_device_id - Set the base/extended device id for a device
83 * @port: RIO master port
84 * @destid: Destination ID of device
85 * @hopcount: Hopcount to device
86 * @did: Device ID value to be written
87 *
88 * Writes the base/extended device id from a device.
89 */
Matt Porterfa78cc52005-11-07 01:00:18 -080090static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
Matt Portereb188d02005-11-07 01:00:17 -080091{
92 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
Zhang Weie0423232008-04-18 13:33:42 -070093 RIO_SET_DID(port->sys_size, did));
Matt Portereb188d02005-11-07 01:00:17 -080094}
95
96/**
97 * rio_local_set_device_id - Set the base/extended device id for a port
98 * @port: RIO master port
99 * @did: Device ID value to be written
100 *
101 * Writes the base/extended device id from a device.
102 */
103static void rio_local_set_device_id(struct rio_mport *port, u16 did)
104{
Zhang Weie0423232008-04-18 13:33:42 -0700105 rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
106 did));
Matt Portereb188d02005-11-07 01:00:17 -0800107}
108
109/**
110 * rio_clear_locks- Release all host locks and signal enumeration complete
111 * @port: Master port to issue transaction
112 *
113 * Marks the component tag CSR on each device with the enumeration
114 * complete flag. When complete, it then release the host locks on
115 * each device. Returns 0 on success or %-EINVAL on failure.
116 */
117static int rio_clear_locks(struct rio_mport *port)
118{
119 struct rio_dev *rdev;
120 u32 result;
121 int ret = 0;
122
Matt Portereb188d02005-11-07 01:00:17 -0800123 /* Release host device id locks */
124 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
125 port->host_deviceid);
126 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
127 if ((result & 0xffff) != 0xffff) {
128 printk(KERN_INFO
129 "RIO: badness when releasing host lock on master port, result %8.8x\n",
130 result);
131 ret = -EINVAL;
132 }
133 list_for_each_entry(rdev, &rio_devices, global_list) {
134 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
135 port->host_deviceid);
136 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
137 if ((result & 0xffff) != 0xffff) {
138 printk(KERN_INFO
139 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
140 rdev->vid, rdev->did);
141 ret = -EINVAL;
142 }
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700143
144 /* Mark device as discovered and enable master */
145 rio_read_config_32(rdev,
146 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
147 &result);
148 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
149 rio_write_config_32(rdev,
150 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
151 result);
Matt Portereb188d02005-11-07 01:00:17 -0800152 }
153
154 return ret;
155}
156
157/**
158 * rio_enum_host- Set host lock and initialize host destination ID
159 * @port: Master port to issue transaction
160 *
161 * Sets the local host master port lock and destination ID register
162 * with the host device ID value. The host device ID value is provided
163 * by the platform. Returns %0 on success or %-1 on failure.
164 */
165static int rio_enum_host(struct rio_mport *port)
166{
167 u32 result;
168
169 /* Set master port host device id lock */
170 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
171 port->host_deviceid);
172
173 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
174 if ((result & 0xffff) != port->host_deviceid)
175 return -1;
176
177 /* Set master port destid and init destid ctr */
178 rio_local_set_device_id(port, port->host_deviceid);
179
180 if (next_destid == port->host_deviceid)
181 next_destid++;
182
183 return 0;
184}
185
186/**
187 * rio_device_has_destid- Test if a device contains a destination ID register
188 * @port: Master port to issue transaction
189 * @src_ops: RIO device source operations
190 * @dst_ops: RIO device destination operations
191 *
192 * Checks the provided @src_ops and @dst_ops for the necessary transaction
193 * capabilities that indicate whether or not a device will implement a
194 * destination ID register. Returns 1 if true or 0 if false.
195 */
196static int rio_device_has_destid(struct rio_mport *port, int src_ops,
197 int dst_ops)
198{
Matt Porterfa78cc52005-11-07 01:00:18 -0800199 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;
200
201 return !!((src_ops | dst_ops) & mask);
Matt Portereb188d02005-11-07 01:00:17 -0800202}
203
204/**
205 * rio_release_dev- Frees a RIO device struct
206 * @dev: LDM device associated with a RIO device struct
207 *
208 * Gets the RIO device struct associated a RIO device struct.
209 * The RIO device struct is freed.
210 */
211static void rio_release_dev(struct device *dev)
212{
213 struct rio_dev *rdev;
214
215 rdev = to_rio_dev(dev);
216 kfree(rdev);
217}
218
219/**
220 * rio_is_switch- Tests if a RIO device has switch capabilities
221 * @rdev: RIO device
222 *
223 * Gets the RIO device Processing Element Features register
224 * contents and tests for switch capabilities. Returns 1 if
225 * the device is a switch or 0 if it is not a switch.
226 * The RIO device struct is freed.
227 */
228static int rio_is_switch(struct rio_dev *rdev)
229{
230 if (rdev->pef & RIO_PEF_SWITCH)
231 return 1;
232 return 0;
233}
234
235/**
Alexandre Bounine058f88d62010-05-26 14:44:03 -0700236 * rio_switch_init - Sets switch operations for a particular vendor switch
Matt Portereb188d02005-11-07 01:00:17 -0800237 * @rdev: RIO device
Alexandre Bounine058f88d62010-05-26 14:44:03 -0700238 * @do_enum: Enumeration/Discovery mode flag
Matt Portereb188d02005-11-07 01:00:17 -0800239 *
Alexandre Bounine058f88d62010-05-26 14:44:03 -0700240 * Searches the RIO switch ops table for known switch types. If the vid
241 * and did match a switch table entry, then call switch initialization
242 * routine to setup switch-specific routines.
Matt Portereb188d02005-11-07 01:00:17 -0800243 */
Alexandre Bounine058f88d62010-05-26 14:44:03 -0700244static void rio_switch_init(struct rio_dev *rdev, int do_enum)
Matt Portereb188d02005-11-07 01:00:17 -0800245{
Alexandre Bounine058f88d62010-05-26 14:44:03 -0700246 struct rio_switch_ops *cur = __start_rio_switch_ops;
247 struct rio_switch_ops *end = __end_rio_switch_ops;
Matt Portereb188d02005-11-07 01:00:17 -0800248
249 while (cur < end) {
250 if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
Alexandre Bounine058f88d62010-05-26 14:44:03 -0700251 pr_debug("RIO: calling init routine for %s\n",
252 rio_name(rdev));
253 cur->init_hook(rdev, do_enum);
Alexandre Bounine07590ff2010-05-26 14:43:57 -0700254 break;
Matt Portereb188d02005-11-07 01:00:17 -0800255 }
256 cur++;
257 }
258
Alexandre Bounine07590ff2010-05-26 14:43:57 -0700259 if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
260 pr_debug("RIO: adding STD routing ops for %s\n",
261 rio_name(rdev));
262 rdev->rswitch->add_entry = rio_std_route_add_entry;
263 rdev->rswitch->get_entry = rio_std_route_get_entry;
264 rdev->rswitch->clr_table = rio_std_route_clr_table;
265 }
266
Matt Portereb188d02005-11-07 01:00:17 -0800267 if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
268 printk(KERN_ERR "RIO: missing routing ops for %s\n",
269 rio_name(rdev));
270}
271
272/**
273 * rio_add_device- Adds a RIO device to the device model
274 * @rdev: RIO device
275 *
276 * Adds the RIO device to the global device list and adds the RIO
277 * device to the RIO device list. Creates the generic sysfs nodes
278 * for an RIO device.
279 */
Yang Li5f28c522009-05-11 22:36:02 +0000280static int __devinit rio_add_device(struct rio_dev *rdev)
Matt Portereb188d02005-11-07 01:00:17 -0800281{
Yang Li5f28c522009-05-11 22:36:02 +0000282 int err;
283
284 err = device_add(&rdev->dev);
285 if (err)
286 return err;
Matt Portereb188d02005-11-07 01:00:17 -0800287
288 spin_lock(&rio_global_list_lock);
289 list_add_tail(&rdev->global_list, &rio_devices);
290 spin_unlock(&rio_global_list_lock);
291
292 rio_create_sysfs_dev_files(rdev);
Yang Li5f28c522009-05-11 22:36:02 +0000293
294 return 0;
Matt Portereb188d02005-11-07 01:00:17 -0800295}
296
297/**
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300298 * rio_enable_rx_tx_port - enable input receiver and output transmitter of
Thomas Moll933af4a2010-05-26 14:44:01 -0700299 * given port
300 * @port: Master port associated with the RIO network
301 * @local: local=1 select local port otherwise a far device is reached
302 * @destid: Destination ID of the device to check host bit
303 * @hopcount: Number of hops to reach the target
304 * @port_num: Port (-number on switch) to enable on a far end device
305 *
306 * Returns 0 or 1 from on General Control Command and Status Register
307 * (EXT_PTR+0x3C)
308 */
309inline int rio_enable_rx_tx_port(struct rio_mport *port,
310 int local, u16 destid,
311 u8 hopcount, u8 port_num) {
312#ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
313 u32 regval;
314 u32 ext_ftr_ptr;
315
316 /*
317 * enable rx input tx output port
318 */
319 pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
320 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
321
322 ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
323
324 if (local) {
325 rio_local_read_config_32(port, ext_ftr_ptr +
326 RIO_PORT_N_CTL_CSR(0),
327 &regval);
328 } else {
329 if (rio_mport_read_config_32(port, destid, hopcount,
330 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), &regval) < 0)
331 return -EIO;
332 }
333
334 if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
335 /* serial */
336 regval = regval | RIO_PORT_N_CTL_EN_RX_SER
337 | RIO_PORT_N_CTL_EN_TX_SER;
338 } else {
339 /* parallel */
340 regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
341 | RIO_PORT_N_CTL_EN_TX_PAR;
342 }
343
344 if (local) {
345 rio_local_write_config_32(port, ext_ftr_ptr +
346 RIO_PORT_N_CTL_CSR(0), regval);
347 } else {
348 if (rio_mport_write_config_32(port, destid, hopcount,
349 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
350 return -EIO;
351 }
352#endif
353 return 0;
354}
355
356/**
Matt Portereb188d02005-11-07 01:00:17 -0800357 * rio_setup_device- Allocates and sets up a RIO device
358 * @net: RIO network
359 * @port: Master port to send transactions
360 * @destid: Current destination ID
361 * @hopcount: Current hopcount
362 * @do_enum: Enumeration/Discovery mode flag
363 *
364 * Allocates a RIO device and configures fields based on configuration
365 * space contents. If device has a destination ID register, a destination
366 * ID is either assigned in enumeration mode or read from configuration
367 * space in discovery mode. If the device has switch capabilities, then
368 * a switch is allocated and configured appropriately. Returns a pointer
369 * to a RIO device on success or NULL on failure.
370 *
371 */
Li Yang181a6ff2009-05-12 16:36:03 +0800372static struct rio_dev __devinit *rio_setup_device(struct rio_net *net,
Matt Portereb188d02005-11-07 01:00:17 -0800373 struct rio_mport *port, u16 destid,
374 u8 hopcount, int do_enum)
375{
Yang Li5f28c522009-05-11 22:36:02 +0000376 int ret = 0;
Matt Portereb188d02005-11-07 01:00:17 -0800377 struct rio_dev *rdev;
Yang Li5f28c522009-05-11 22:36:02 +0000378 struct rio_switch *rswitch = NULL;
Matt Portereb188d02005-11-07 01:00:17 -0800379 int result, rdid;
Alexandre Bounineded05782011-01-12 17:00:39 -0800380 size_t size;
381 u32 swpinfo = 0;
Matt Portereb188d02005-11-07 01:00:17 -0800382
Alexandre Bounineded05782011-01-12 17:00:39 -0800383 size = sizeof(struct rio_dev);
384 if (rio_mport_read_config_32(port, destid, hopcount,
385 RIO_PEF_CAR, &result))
386 return NULL;
387
388 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
389 rio_mport_read_config_32(port, destid, hopcount,
390 RIO_SWP_INFO_CAR, &swpinfo);
391 if (result & RIO_PEF_SWITCH) {
392 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
393 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
394 }
395 }
396
397 rdev = kzalloc(size, GFP_KERNEL);
Matt Portereb188d02005-11-07 01:00:17 -0800398 if (!rdev)
Yang Li5f28c522009-05-11 22:36:02 +0000399 return NULL;
Matt Portereb188d02005-11-07 01:00:17 -0800400
Matt Portereb188d02005-11-07 01:00:17 -0800401 rdev->net = net;
Alexandre Bounineded05782011-01-12 17:00:39 -0800402 rdev->pef = result;
403 rdev->swpinfo = swpinfo;
Matt Portereb188d02005-11-07 01:00:17 -0800404 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
405 &result);
406 rdev->did = result >> 16;
407 rdev->vid = result & 0xffff;
408 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
409 &rdev->device_rev);
410 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
411 &result);
412 rdev->asm_did = result >> 16;
413 rdev->asm_vid = result & 0xffff;
414 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
415 &result);
416 rdev->asm_rev = result >> 16;
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700417 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
Matt Portereb188d02005-11-07 01:00:17 -0800418 rdev->efptr = result & 0xffff;
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700419 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
420 hopcount);
421
422 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
423 hopcount, RIO_EFB_ERR_MGMNT);
424 }
Matt Portereb188d02005-11-07 01:00:17 -0800425
426 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
427 &rdev->src_ops);
428 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
429 &rdev->dst_ops);
430
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700431 if (do_enum) {
432 /* Assign component tag to device */
433 if (next_comptag >= 0x10000) {
434 pr_err("RIO: Component Tag Counter Overflow\n");
435 goto cleanup;
436 }
437 rio_mport_write_config_32(port, destid, hopcount,
438 RIO_COMPONENT_TAG_CSR, next_comptag);
439 rdev->comp_tag = next_comptag++;
Alexandre Bounine558bda62011-01-12 17:00:42 -0800440 } else {
441 rio_mport_read_config_32(port, destid, hopcount,
442 RIO_COMPONENT_TAG_CSR,
443 &rdev->comp_tag);
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700444 }
445
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800446 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
447 if (do_enum) {
448 rio_set_device_id(port, destid, hopcount, next_destid);
449 rdev->destid = next_destid++;
450 if (next_destid == port->host_deviceid)
451 next_destid++;
452 } else
453 rdev->destid = rio_get_device_id(port, destid, hopcount);
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800454
455 rdev->hopcount = 0xff;
456 } else {
457 /* Switch device has an associated destID which
458 * will be adjusted later
459 */
460 rdev->destid = destid;
461 rdev->hopcount = hopcount;
462 }
Matt Portereb188d02005-11-07 01:00:17 -0800463
464 /* If a PE has both switch and other functions, show it as a switch */
465 if (rio_is_switch(rdev)) {
Alexandre Bounineded05782011-01-12 17:00:39 -0800466 rswitch = rdev->rswitch;
Alexandre Bounine558bda62011-01-12 17:00:42 -0800467 rswitch->switchid = rdev->comp_tag & RIO_CTAG_UDEVID;
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700468 rswitch->port_ok = 0;
Zhang Weie0423232008-04-18 13:33:42 -0700469 rswitch->route_table = kzalloc(sizeof(u8)*
470 RIO_MAX_ROUTE_ENTRIES(port->sys_size),
471 GFP_KERNEL);
Yang Li5f28c522009-05-11 22:36:02 +0000472 if (!rswitch->route_table)
473 goto cleanup;
Matt Portereb188d02005-11-07 01:00:17 -0800474 /* Initialize switch route table */
Zhang Weie0423232008-04-18 13:33:42 -0700475 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
476 rdid++)
Matt Portereb188d02005-11-07 01:00:17 -0800477 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
Kay Sieversb53c75832008-12-04 10:01:52 -0800478 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
Alexandre Bounineded05782011-01-12 17:00:39 -0800479 rswitch->switchid);
Alexandre Bounine058f88d62010-05-26 14:44:03 -0700480 rio_switch_init(rdev, do_enum);
Matt Portereb188d02005-11-07 01:00:17 -0800481
Alexandre Bounineded05782011-01-12 17:00:39 -0800482 if (do_enum && rswitch->clr_table)
483 rswitch->clr_table(port, destid, hopcount,
484 RIO_GLOBAL_TABLE);
Alexandre Bounine07590ff2010-05-26 14:43:57 -0700485
Matt Portereb188d02005-11-07 01:00:17 -0800486 list_add_tail(&rswitch->node, &rio_switches);
487
Thomas Moll933af4a2010-05-26 14:44:01 -0700488 } else {
489 if (do_enum)
490 /*Enable Input Output Port (transmitter reviever)*/
491 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
492
Kay Sieversb53c75832008-12-04 10:01:52 -0800493 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
494 rdev->destid);
Thomas Moll933af4a2010-05-26 14:44:01 -0700495 }
Matt Portereb188d02005-11-07 01:00:17 -0800496
497 rdev->dev.bus = &rio_bus_type;
Alexandre Bounine2c70f022010-10-27 15:34:26 -0700498 rdev->dev.parent = &rio_bus;
Matt Portereb188d02005-11-07 01:00:17 -0800499
500 device_initialize(&rdev->dev);
501 rdev->dev.release = rio_release_dev;
502 rio_dev_get(rdev);
503
Yang Hongyang284901a2009-04-06 19:01:15 -0700504 rdev->dma_mask = DMA_BIT_MASK(32);
Matt Porterfa78cc52005-11-07 01:00:18 -0800505 rdev->dev.dma_mask = &rdev->dma_mask;
Yang Hongyang284901a2009-04-06 19:01:15 -0700506 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
Matt Portereb188d02005-11-07 01:00:17 -0800507
Alexandre Bounine284fb682011-08-25 15:59:13 -0700508 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
Matt Portereb188d02005-11-07 01:00:17 -0800509 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
510 0, 0xffff);
511
Yang Li5f28c522009-05-11 22:36:02 +0000512 ret = rio_add_device(rdev);
513 if (ret)
514 goto cleanup;
Matt Portereb188d02005-11-07 01:00:17 -0800515
Matt Portereb188d02005-11-07 01:00:17 -0800516 return rdev;
Yang Li5f28c522009-05-11 22:36:02 +0000517
518cleanup:
Alexandre Bounine166c0502011-11-02 13:39:11 -0700519 if (rswitch)
Yang Li5f28c522009-05-11 22:36:02 +0000520 kfree(rswitch->route_table);
Alexandre Bounineded05782011-01-12 17:00:39 -0800521
Yang Li5f28c522009-05-11 22:36:02 +0000522 kfree(rdev);
523 return NULL;
Matt Portereb188d02005-11-07 01:00:17 -0800524}
525
526/**
527 * rio_sport_is_active- Tests if a switch port has an active connection.
528 * @port: Master port to send transaction
529 * @destid: Associated destination ID for switch
530 * @hopcount: Hopcount to reach switch
531 * @sport: Switch port number
532 *
533 * Reads the port error status CSR for a particular switch port to
534 * determine if the port has an active link. Returns
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700535 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
Matt Portereb188d02005-11-07 01:00:17 -0800536 * inactive.
537 */
538static int
539rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
540{
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700541 u32 result = 0;
Matt Portereb188d02005-11-07 01:00:17 -0800542 u32 ext_ftr_ptr;
543
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700544 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
Matt Portereb188d02005-11-07 01:00:17 -0800545
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700546 while (ext_ftr_ptr) {
547 rio_mport_read_config_32(port, destid, hopcount,
548 ext_ftr_ptr, &result);
549 result = RIO_GET_BLOCK_ID(result);
550 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
551 (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
552 (result == RIO_EFB_SER_EP_FREC_ID))
Matt Portereb188d02005-11-07 01:00:17 -0800553 break;
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700554
555 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
556 ext_ftr_ptr);
557 }
Matt Portereb188d02005-11-07 01:00:17 -0800558
559 if (ext_ftr_ptr)
560 rio_mport_read_config_32(port, destid, hopcount,
561 ext_ftr_ptr +
562 RIO_PORT_N_ERR_STS_CSR(sport),
563 &result);
564
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700565 return result & RIO_PORT_N_ERR_STS_PORT_OK;
Matt Portereb188d02005-11-07 01:00:17 -0800566}
567
568/**
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700569 * rio_lock_device - Acquires host device lock for specified device
570 * @port: Master port to send transaction
571 * @destid: Destination ID for device/switch
572 * @hopcount: Hopcount to reach switch
573 * @wait_ms: Max wait time in msec (0 = no timeout)
574 *
575 * Attepts to acquire host device lock for specified device
576 * Returns 0 if device lock acquired or EINVAL if timeout expires.
577 */
578static int
579rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
580{
581 u32 result;
582 int tcnt = 0;
583
584 /* Attempt to acquire device lock */
585 rio_mport_write_config_32(port, destid, hopcount,
586 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
587 rio_mport_read_config_32(port, destid, hopcount,
588 RIO_HOST_DID_LOCK_CSR, &result);
589
590 while (result != port->host_deviceid) {
591 if (wait_ms != 0 && tcnt == wait_ms) {
592 pr_debug("RIO: timeout when locking device %x:%x\n",
593 destid, hopcount);
594 return -EINVAL;
595 }
596
597 /* Delay a bit */
598 mdelay(1);
599 tcnt++;
600 /* Try to acquire device lock again */
601 rio_mport_write_config_32(port, destid,
602 hopcount,
603 RIO_HOST_DID_LOCK_CSR,
604 port->host_deviceid);
605 rio_mport_read_config_32(port, destid,
606 hopcount,
607 RIO_HOST_DID_LOCK_CSR, &result);
608 }
609
610 return 0;
611}
612
613/**
614 * rio_unlock_device - Releases host device lock for specified device
615 * @port: Master port to send transaction
616 * @destid: Destination ID for device/switch
617 * @hopcount: Hopcount to reach switch
618 *
619 * Returns 0 if device lock released or EINVAL if fails.
620 */
621static int
622rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
623{
624 u32 result;
625
626 /* Release device lock */
627 rio_mport_write_config_32(port, destid,
628 hopcount,
629 RIO_HOST_DID_LOCK_CSR,
630 port->host_deviceid);
631 rio_mport_read_config_32(port, destid, hopcount,
632 RIO_HOST_DID_LOCK_CSR, &result);
633 if ((result & 0xffff) != 0xffff) {
634 pr_debug("RIO: badness when releasing device lock %x:%x\n",
635 destid, hopcount);
636 return -EINVAL;
637 }
638
639 return 0;
640}
641
642/**
Matt Portereb188d02005-11-07 01:00:17 -0800643 * rio_route_add_entry- Add a route entry to a switch routing table
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800644 * @rdev: RIO device
Matt Portereb188d02005-11-07 01:00:17 -0800645 * @table: Routing table ID
646 * @route_destid: Destination ID to be routed
647 * @route_port: Port number to be routed
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700648 * @lock: lock switch device flag
Matt Portereb188d02005-11-07 01:00:17 -0800649 *
650 * Calls the switch specific add_entry() method to add a route entry
651 * on a switch. The route table can be specified using the @table
652 * argument if a switch has per port routing tables or the normal
653 * use is to specific all tables (or the global table) by passing
654 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
655 * on failure.
656 */
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700657static int
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800658rio_route_add_entry(struct rio_dev *rdev,
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700659 u16 table, u16 route_destid, u8 route_port, int lock)
Matt Portereb188d02005-11-07 01:00:17 -0800660{
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700661 int rc;
662
663 if (lock) {
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800664 rc = rio_lock_device(rdev->net->hport, rdev->destid,
665 rdev->hopcount, 1000);
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700666 if (rc)
667 return rc;
668 }
669
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800670 rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid,
671 rdev->hopcount, table,
672 route_destid, route_port);
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700673 if (lock)
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800674 rio_unlock_device(rdev->net->hport, rdev->destid,
675 rdev->hopcount);
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700676
677 return rc;
Matt Portereb188d02005-11-07 01:00:17 -0800678}
679
680/**
681 * rio_route_get_entry- Read a route entry in a switch routing table
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800682 * @rdev: RIO device
Matt Portereb188d02005-11-07 01:00:17 -0800683 * @table: Routing table ID
684 * @route_destid: Destination ID to be routed
685 * @route_port: Pointer to read port number into
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700686 * @lock: lock switch device flag
Matt Portereb188d02005-11-07 01:00:17 -0800687 *
688 * Calls the switch specific get_entry() method to read a route entry
689 * in a switch. The route table can be specified using the @table
690 * argument if a switch has per port routing tables or the normal
691 * use is to specific all tables (or the global table) by passing
692 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
693 * on failure.
694 */
695static int
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800696rio_route_get_entry(struct rio_dev *rdev, u16 table,
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700697 u16 route_destid, u8 *route_port, int lock)
Matt Portereb188d02005-11-07 01:00:17 -0800698{
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700699 int rc;
700
701 if (lock) {
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800702 rc = rio_lock_device(rdev->net->hport, rdev->destid,
703 rdev->hopcount, 1000);
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700704 if (rc)
705 return rc;
706 }
707
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800708 rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid,
709 rdev->hopcount, table,
710 route_destid, route_port);
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700711 if (lock)
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800712 rio_unlock_device(rdev->net->hport, rdev->destid,
713 rdev->hopcount);
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700714
715 return rc;
Matt Portereb188d02005-11-07 01:00:17 -0800716}
717
718/**
719 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
720 * @port: Master port to send transaction
721 * @hopcount: Number of hops to the device
722 *
723 * Used during enumeration to read the Host Device ID Lock CSR on a
724 * RIO device. Returns the value of the lock register.
725 */
726static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
727{
728 u32 result;
729
Zhang Weie0423232008-04-18 13:33:42 -0700730 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
Matt Portereb188d02005-11-07 01:00:17 -0800731 RIO_HOST_DID_LOCK_CSR, &result);
732
733 return (u16) (result & 0xffff);
734}
735
736/**
Matt Portereb188d02005-11-07 01:00:17 -0800737 * rio_enum_peer- Recursively enumerate a RIO network through a master port
738 * @net: RIO network being enumerated
739 * @port: Master port to send transactions
740 * @hopcount: Number of hops into the network
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700741 * @prev: Previous RIO device connected to the enumerated one
742 * @prev_port: Port on previous RIO device
Matt Portereb188d02005-11-07 01:00:17 -0800743 *
744 * Recursively enumerates a RIO network. Transactions are sent via the
745 * master port passed in @port.
746 */
Li Yang181a6ff2009-05-12 16:36:03 +0800747static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700748 u8 hopcount, struct rio_dev *prev, int prev_port)
Matt Portereb188d02005-11-07 01:00:17 -0800749{
750 int port_num;
Matt Portereb188d02005-11-07 01:00:17 -0800751 int cur_destid;
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800752 int sw_destid;
753 int sw_inport;
Matt Portereb188d02005-11-07 01:00:17 -0800754 struct rio_dev *rdev;
755 u16 destid;
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700756 u32 regval;
Matt Portereb188d02005-11-07 01:00:17 -0800757 int tmp;
758
Alexandre Bouninee274e0e2010-10-27 15:34:32 -0700759 if (rio_mport_chk_dev_access(port,
760 RIO_ANY_DESTID(port->sys_size), hopcount)) {
761 pr_debug("RIO: device access check failed\n");
762 return -1;
763 }
764
Matt Portereb188d02005-11-07 01:00:17 -0800765 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
766 pr_debug("RIO: PE already discovered by this host\n");
767 /*
768 * Already discovered by this host. Add it as another
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700769 * link to the existing device.
Matt Portereb188d02005-11-07 01:00:17 -0800770 */
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700771 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
772 hopcount, RIO_COMPONENT_TAG_CSR, &regval);
773
774 if (regval) {
775 rdev = rio_get_comptag((regval & 0xffff), NULL);
776
777 if (rdev && prev && rio_is_switch(prev)) {
778 pr_debug("RIO: redundant path to %s\n",
779 rio_name(rdev));
780 prev->rswitch->nextdev[prev_port] = rdev;
781 }
782 }
783
Matt Portereb188d02005-11-07 01:00:17 -0800784 return 0;
785 }
786
787 /* Attempt to acquire device lock */
Zhang Weie0423232008-04-18 13:33:42 -0700788 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
789 hopcount,
Matt Portereb188d02005-11-07 01:00:17 -0800790 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
791 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
792 < port->host_deviceid) {
793 /* Delay a bit */
794 mdelay(1);
795 /* Attempt to acquire device lock again */
Zhang Weie0423232008-04-18 13:33:42 -0700796 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
797 hopcount,
Matt Portereb188d02005-11-07 01:00:17 -0800798 RIO_HOST_DID_LOCK_CSR,
799 port->host_deviceid);
800 }
801
802 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
803 pr_debug(
804 "RIO: PE locked by a higher priority host...retreating\n");
805 return -1;
806 }
807
808 /* Setup new RIO device */
Zhang Weie0423232008-04-18 13:33:42 -0700809 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
810 hopcount, 1);
811 if (rdev) {
Matt Portereb188d02005-11-07 01:00:17 -0800812 /* Add device to the global and bus/net specific list. */
813 list_add_tail(&rdev->net_list, &net->devices);
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700814 rdev->prev = prev;
815 if (prev && rio_is_switch(prev))
816 prev->rswitch->nextdev[prev_port] = rdev;
Matt Portereb188d02005-11-07 01:00:17 -0800817 } else
818 return -1;
819
820 if (rio_is_switch(rdev)) {
Alexandre Bounineae05cbd2010-10-27 15:34:29 -0700821 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800822 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700823 port->host_deviceid, sw_inport, 0);
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800824 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
Matt Portereb188d02005-11-07 01:00:17 -0800825
826 for (destid = 0; destid < next_destid; destid++) {
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800827 if (destid == port->host_deviceid)
828 continue;
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800829 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700830 destid, sw_inport, 0);
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800831 rdev->rswitch->route_table[destid] = sw_inport;
Matt Portereb188d02005-11-07 01:00:17 -0800832 }
833
Matt Portereb188d02005-11-07 01:00:17 -0800834 pr_debug(
835 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700836 rio_name(rdev), rdev->vid, rdev->did,
837 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800838 sw_destid = next_destid;
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700839 for (port_num = 0;
840 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
841 port_num++) {
Thomas Moll933af4a2010-05-26 14:44:01 -0700842 /*Enable Input Output Port (transmitter reviever)*/
843 rio_enable_rx_tx_port(port, 0,
844 RIO_ANY_DESTID(port->sys_size),
845 hopcount, port_num);
846
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700847 if (sw_inport == port_num) {
848 rdev->rswitch->port_ok |= (1 << port_num);
Matt Portereb188d02005-11-07 01:00:17 -0800849 continue;
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700850 }
Matt Portereb188d02005-11-07 01:00:17 -0800851
852 cur_destid = next_destid;
853
854 if (rio_sport_is_active
Zhang Weie0423232008-04-18 13:33:42 -0700855 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
856 port_num)) {
Matt Portereb188d02005-11-07 01:00:17 -0800857 pr_debug(
858 "RIO: scanning device on port %d\n",
859 port_num);
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700860 rdev->rswitch->port_ok |= (1 << port_num);
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800861 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
Zhang Weie0423232008-04-18 13:33:42 -0700862 RIO_ANY_DESTID(port->sys_size),
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700863 port_num, 0);
Matt Portereb188d02005-11-07 01:00:17 -0800864
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700865 if (rio_enum_peer(net, port, hopcount + 1,
866 rdev, port_num) < 0)
Matt Portereb188d02005-11-07 01:00:17 -0800867 return -1;
868
869 /* Update routing tables */
870 if (next_destid > cur_destid) {
871 for (destid = cur_destid;
872 destid < next_destid; destid++) {
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800873 if (destid == port->host_deviceid)
874 continue;
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800875 rio_route_add_entry(rdev,
Matt Portereb188d02005-11-07 01:00:17 -0800876 RIO_GLOBAL_TABLE,
877 destid,
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700878 port_num,
879 0);
Matt Portereb188d02005-11-07 01:00:17 -0800880 rdev->rswitch->
881 route_table[destid] =
882 port_num;
883 }
Matt Portereb188d02005-11-07 01:00:17 -0800884 }
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700885 } else {
886 /* If switch supports Error Management,
887 * set PORT_LOCKOUT bit for unused port
888 */
889 if (rdev->em_efptr)
890 rio_set_port_lockout(rdev, port_num, 1);
891
892 rdev->rswitch->port_ok &= ~(1 << port_num);
Matt Portereb188d02005-11-07 01:00:17 -0800893 }
894 }
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800895
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700896 /* Direct Port-write messages to the enumeratiing host */
897 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
898 (rdev->em_efptr)) {
899 rio_write_config_32(rdev,
900 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
901 (port->host_deviceid << 16) |
902 (port->sys_size << 15));
903 }
904
905 rio_init_em(rdev);
906
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800907 /* Check for empty switch */
908 if (next_destid == sw_destid) {
909 next_destid++;
910 if (next_destid == port->host_deviceid)
911 next_destid++;
912 }
913
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800914 rdev->destid = sw_destid;
Matt Portereb188d02005-11-07 01:00:17 -0800915 } else
916 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
917 rio_name(rdev), rdev->vid, rdev->did);
918
919 return 0;
920}
921
922/**
923 * rio_enum_complete- Tests if enumeration of a network is complete
924 * @port: Master port to send transaction
925 *
Liu Ganga5712592011-11-02 13:39:05 -0700926 * Tests the PGCCSR discovered bit for non-zero value (enumeration
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -0700927 * complete flag). Return %1 if enumeration is complete or %0 if
Matt Portereb188d02005-11-07 01:00:17 -0800928 * enumeration is incomplete.
929 */
930static int rio_enum_complete(struct rio_mport *port)
931{
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700932 u32 regval;
Matt Portereb188d02005-11-07 01:00:17 -0800933
Alexandre Bounineaf84ca32010-10-27 15:34:34 -0700934 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
935 &regval);
Liu Ganga5712592011-11-02 13:39:05 -0700936 return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
Matt Portereb188d02005-11-07 01:00:17 -0800937}
938
939/**
940 * rio_disc_peer- Recursively discovers a RIO network through a master port
941 * @net: RIO network being discovered
942 * @port: Master port to send transactions
943 * @destid: Current destination ID in network
944 * @hopcount: Number of hops into the network
Randy Dunlap9b310ac2011-01-22 20:16:12 -0800945 * @prev: previous rio_dev
946 * @prev_port: previous port number
Matt Portereb188d02005-11-07 01:00:17 -0800947 *
948 * Recursively discovers a RIO network. Transactions are sent via the
949 * master port passed in @port.
950 */
Li Yang181a6ff2009-05-12 16:36:03 +0800951static int __devinit
Matt Portereb188d02005-11-07 01:00:17 -0800952rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
Alexandre Bounine17e96202011-01-12 17:00:41 -0800953 u8 hopcount, struct rio_dev *prev, int prev_port)
Matt Portereb188d02005-11-07 01:00:17 -0800954{
955 u8 port_num, route_port;
Matt Portereb188d02005-11-07 01:00:17 -0800956 struct rio_dev *rdev;
957 u16 ndestid;
958
959 /* Setup new RIO device */
960 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
961 /* Add device to the global and bus/net specific list. */
962 list_add_tail(&rdev->net_list, &net->devices);
Alexandre Bounine17e96202011-01-12 17:00:41 -0800963 rdev->prev = prev;
964 if (prev && rio_is_switch(prev))
965 prev->rswitch->nextdev[prev_port] = rdev;
Matt Portereb188d02005-11-07 01:00:17 -0800966 } else
967 return -1;
968
969 if (rio_is_switch(rdev)) {
Matt Portereb188d02005-11-07 01:00:17 -0800970 /* Associated destid is how we accessed this switch */
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800971 rdev->destid = destid;
Matt Portereb188d02005-11-07 01:00:17 -0800972
Matt Portereb188d02005-11-07 01:00:17 -0800973 pr_debug(
974 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
Alexandre Bounine68fe4df2010-10-27 15:34:29 -0700975 rio_name(rdev), rdev->vid, rdev->did,
976 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
977 for (port_num = 0;
978 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
979 port_num++) {
Alexandre Bounineae05cbd2010-10-27 15:34:29 -0700980 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
Matt Portereb188d02005-11-07 01:00:17 -0800981 continue;
982
983 if (rio_sport_is_active
984 (port, destid, hopcount, port_num)) {
985 pr_debug(
986 "RIO: scanning device on port %d\n",
987 port_num);
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700988
989 rio_lock_device(port, destid, hopcount, 1000);
990
Zhang Weie0423232008-04-18 13:33:42 -0700991 for (ndestid = 0;
992 ndestid < RIO_ANY_DESTID(port->sys_size);
Matt Portereb188d02005-11-07 01:00:17 -0800993 ndestid++) {
Alexandre Bouninea93192a2011-01-12 17:00:38 -0800994 rio_route_get_entry(rdev,
Matt Portereb188d02005-11-07 01:00:17 -0800995 RIO_GLOBAL_TABLE,
996 ndestid,
Alexandre Bounine818a04a2010-05-26 14:43:58 -0700997 &route_port, 0);
Matt Portereb188d02005-11-07 01:00:17 -0800998 if (route_port == port_num)
999 break;
1000 }
1001
Alexandre Bounineaf84ca32010-10-27 15:34:34 -07001002 if (ndestid == RIO_ANY_DESTID(port->sys_size))
1003 continue;
Alexandre Bounine818a04a2010-05-26 14:43:58 -07001004 rio_unlock_device(port, destid, hopcount);
Alexandre Bounine17e96202011-01-12 17:00:41 -08001005 if (rio_disc_peer(net, port, ndestid,
1006 hopcount + 1, rdev, port_num) < 0)
Matt Portereb188d02005-11-07 01:00:17 -08001007 return -1;
1008 }
1009 }
1010 } else
1011 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
1012 rio_name(rdev), rdev->vid, rdev->did);
1013
1014 return 0;
1015}
1016
1017/**
1018 * rio_mport_is_active- Tests if master port link is active
1019 * @port: Master port to test
1020 *
1021 * Reads the port error status CSR for the master port to
1022 * determine if the port has an active link. Returns
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -07001023 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
Matt Portereb188d02005-11-07 01:00:17 -08001024 * or %0 if it is inactive.
1025 */
1026static int rio_mport_is_active(struct rio_mport *port)
1027{
1028 u32 result = 0;
1029 u32 ext_ftr_ptr;
1030 int *entry = rio_mport_phys_table;
1031
1032 do {
1033 if ((ext_ftr_ptr =
1034 rio_mport_get_feature(port, 1, 0, 0, *entry)))
1035 break;
1036 } while (*++entry >= 0);
1037
1038 if (ext_ftr_ptr)
1039 rio_local_read_config_32(port,
1040 ext_ftr_ptr +
1041 RIO_PORT_N_ERR_STS_CSR(port->index),
1042 &result);
1043
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -07001044 return result & RIO_PORT_N_ERR_STS_PORT_OK;
Matt Portereb188d02005-11-07 01:00:17 -08001045}
1046
1047/**
1048 * rio_alloc_net- Allocate and configure a new RIO network
1049 * @port: Master port associated with the RIO network
1050 *
1051 * Allocates a RIO network structure, initializes per-network
1052 * list heads, and adds the associated master port to the
1053 * network list of associated master ports. Returns a
1054 * RIO network pointer on success or %NULL on failure.
1055 */
1056static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
1057{
1058 struct rio_net *net;
1059
Yoann Padioleaudd00cc42007-07-19 01:49:03 -07001060 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
Matt Portereb188d02005-11-07 01:00:17 -08001061 if (net) {
Matt Portereb188d02005-11-07 01:00:17 -08001062 INIT_LIST_HEAD(&net->node);
1063 INIT_LIST_HEAD(&net->devices);
1064 INIT_LIST_HEAD(&net->mports);
1065 list_add_tail(&port->nnode, &net->mports);
1066 net->hport = port;
1067 net->id = next_net++;
1068 }
1069 return net;
1070}
1071
1072/**
Alexandre Bouninec70555b2007-02-10 01:46:47 -08001073 * rio_update_route_tables- Updates route tables in switches
1074 * @port: Master port associated with the RIO network
1075 *
1076 * For each enumerated device, ensure that each switch in a system
1077 * has correct routing entries. Add routes for devices that where
1078 * unknown dirung the first enumeration pass through the switch.
1079 */
1080static void rio_update_route_tables(struct rio_mport *port)
1081{
Alexandre Bounineded05782011-01-12 17:00:39 -08001082 struct rio_dev *rdev, *swrdev;
Alexandre Bouninec70555b2007-02-10 01:46:47 -08001083 struct rio_switch *rswitch;
1084 u8 sport;
1085 u16 destid;
1086
1087 list_for_each_entry(rdev, &rio_devices, global_list) {
1088
Alexandre Bouninea93192a2011-01-12 17:00:38 -08001089 destid = rdev->destid;
Alexandre Bouninec70555b2007-02-10 01:46:47 -08001090
1091 list_for_each_entry(rswitch, &rio_switches, node) {
1092
1093 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
1094 continue;
1095
1096 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
Alexandre Bounineded05782011-01-12 17:00:39 -08001097 swrdev = sw_to_rio_dev(rswitch);
1098
Alexandre Bounine07590ff2010-05-26 14:43:57 -07001099 /* Skip if destid ends in empty switch*/
Alexandre Bounineded05782011-01-12 17:00:39 -08001100 if (swrdev->destid == destid)
Alexandre Bounine07590ff2010-05-26 14:43:57 -07001101 continue;
Alexandre Bouninec70555b2007-02-10 01:46:47 -08001102
Alexandre Bounineded05782011-01-12 17:00:39 -08001103 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
Alexandre Bouninec70555b2007-02-10 01:46:47 -08001104
1105 if (rswitch->add_entry) {
Alexandre Bounineded05782011-01-12 17:00:39 -08001106 rio_route_add_entry(swrdev,
Alexandre Bounine818a04a2010-05-26 14:43:58 -07001107 RIO_GLOBAL_TABLE, destid,
1108 sport, 0);
Alexandre Bouninec70555b2007-02-10 01:46:47 -08001109 rswitch->route_table[destid] = sport;
1110 }
1111 }
1112 }
1113 }
1114}
1115
1116/**
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -07001117 * rio_init_em - Initializes RIO Error Management (for switches)
Randy Dunlap97ef6f72010-05-28 15:08:08 -07001118 * @rdev: RIO device
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -07001119 *
1120 * For each enumerated switch, call device-specific error management
1121 * initialization routine (if supplied by the switch driver).
1122 */
1123static void rio_init_em(struct rio_dev *rdev)
1124{
1125 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
1126 (rdev->rswitch->em_init)) {
1127 rdev->rswitch->em_init(rdev);
1128 }
1129}
1130
1131/**
1132 * rio_pw_enable - Enables/disables port-write handling by a master port
1133 * @port: Master port associated with port-write handling
1134 * @enable: 1=enable, 0=disable
1135 */
1136static void rio_pw_enable(struct rio_mport *port, int enable)
1137{
1138 if (port->ops->pwenable)
1139 port->ops->pwenable(port, enable);
1140}
1141
1142/**
Matt Portereb188d02005-11-07 01:00:17 -08001143 * rio_enum_mport- Start enumeration through a master port
1144 * @mport: Master port to send transactions
1145 *
1146 * Starts the enumeration process. If somebody has enumerated our
1147 * master port device, then give up. If not and we have an active
1148 * link, then start recursive peer enumeration. Returns %0 if
1149 * enumeration succeeds or %-EBUSY if enumeration fails.
1150 */
Al Viro37d33d12008-11-22 17:36:24 +00001151int __devinit rio_enum_mport(struct rio_mport *mport)
Matt Portereb188d02005-11-07 01:00:17 -08001152{
1153 struct rio_net *net = NULL;
1154 int rc = 0;
1155
1156 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1157 mport->name);
1158 /* If somebody else enumerated our master port device, bail. */
1159 if (rio_enum_host(mport) < 0) {
1160 printk(KERN_INFO
1161 "RIO: master port %d device has been enumerated by a remote host\n",
1162 mport->id);
1163 rc = -EBUSY;
1164 goto out;
1165 }
1166
1167 /* If master port has an active link, allocate net and enum peers */
1168 if (rio_mport_is_active(mport)) {
1169 if (!(net = rio_alloc_net(mport))) {
1170 printk(KERN_ERR "RIO: failed to allocate new net\n");
1171 rc = -ENOMEM;
1172 goto out;
1173 }
Thomas Moll933af4a2010-05-26 14:44:01 -07001174
1175 /* Enable Input Output Port (transmitter reviever) */
1176 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1177
Alexandre Bounineaf84ca32010-10-27 15:34:34 -07001178 /* Set component tag for host */
1179 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1180 next_comptag++);
1181
Alexandre Bounine68fe4df2010-10-27 15:34:29 -07001182 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
Matt Portereb188d02005-11-07 01:00:17 -08001183 /* A higher priority host won enumeration, bail. */
1184 printk(KERN_INFO
1185 "RIO: master port %d device has lost enumeration to a remote host\n",
1186 mport->id);
1187 rio_clear_locks(mport);
1188 rc = -EBUSY;
1189 goto out;
1190 }
Alexandre Bouninec70555b2007-02-10 01:46:47 -08001191 rio_update_route_tables(mport);
Matt Portereb188d02005-11-07 01:00:17 -08001192 rio_clear_locks(mport);
Alexandre Bouninee5cabeb2010-05-26 14:43:59 -07001193 rio_pw_enable(mport, 1);
Matt Portereb188d02005-11-07 01:00:17 -08001194 } else {
1195 printk(KERN_INFO "RIO: master port %d link inactive\n",
1196 mport->id);
1197 rc = -EINVAL;
1198 }
1199
1200 out:
1201 return rc;
1202}
1203
1204/**
1205 * rio_build_route_tables- Generate route tables from switch route entries
1206 *
1207 * For each switch device, generate a route table by copying existing
1208 * route entries from the switch.
1209 */
1210static void rio_build_route_tables(void)
1211{
1212 struct rio_dev *rdev;
1213 int i;
1214 u8 sport;
1215
1216 list_for_each_entry(rdev, &rio_devices, global_list)
Alexandre Bounine818a04a2010-05-26 14:43:58 -07001217 if (rio_is_switch(rdev)) {
Alexandre Bouninea93192a2011-01-12 17:00:38 -08001218 rio_lock_device(rdev->net->hport, rdev->destid,
1219 rdev->hopcount, 1000);
Alexandre Bounine818a04a2010-05-26 14:43:58 -07001220 for (i = 0;
1221 i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
1222 i++) {
Alexandre Bouninea93192a2011-01-12 17:00:38 -08001223 if (rio_route_get_entry(rdev,
1224 RIO_GLOBAL_TABLE, i, &sport, 0) < 0)
Alexandre Bounine818a04a2010-05-26 14:43:58 -07001225 continue;
1226 rdev->rswitch->route_table[i] = sport;
1227 }
1228
1229 rio_unlock_device(rdev->net->hport,
Alexandre Bouninea93192a2011-01-12 17:00:38 -08001230 rdev->destid,
1231 rdev->hopcount);
Matt Portereb188d02005-11-07 01:00:17 -08001232 }
1233}
1234
1235/**
1236 * rio_enum_timeout- Signal that enumeration timed out
1237 * @data: Address of timeout flag.
1238 *
1239 * When the enumeration complete timer expires, set a flag that
1240 * signals to the discovery process that enumeration did not
1241 * complete in a sane amount of time.
1242 */
1243static void rio_enum_timeout(unsigned long data)
1244{
1245 /* Enumeration timed out, set flag */
1246 *(int *)data = 1;
1247}
1248
1249/**
1250 * rio_disc_mport- Start discovery through a master port
1251 * @mport: Master port to send transactions
1252 *
1253 * Starts the discovery process. If we have an active link,
1254 * then wait for the signal that enumeration is complete.
1255 * When enumeration completion is signaled, start recursive
1256 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1257 * on failure.
1258 */
Al Viro37d33d12008-11-22 17:36:24 +00001259int __devinit rio_disc_mport(struct rio_mport *mport)
Matt Portereb188d02005-11-07 01:00:17 -08001260{
1261 struct rio_net *net = NULL;
1262 int enum_timeout_flag = 0;
1263
1264 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1265 mport->name);
1266
1267 /* If master port has an active link, allocate net and discover peers */
1268 if (rio_mport_is_active(mport)) {
1269 if (!(net = rio_alloc_net(mport))) {
1270 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1271 goto bail;
1272 }
1273
1274 pr_debug("RIO: wait for enumeration complete...");
1275
1276 rio_enum_timer.expires =
1277 jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1278 rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
1279 add_timer(&rio_enum_timer);
1280 while (!rio_enum_complete(mport)) {
1281 mdelay(1);
1282 if (enum_timeout_flag) {
1283 del_timer_sync(&rio_enum_timer);
1284 goto timeout;
1285 }
1286 }
1287 del_timer_sync(&rio_enum_timer);
1288
1289 pr_debug("done\n");
Alexandre Bounine818a04a2010-05-26 14:43:58 -07001290
1291 /* Read DestID assigned by enumerator */
1292 rio_local_read_config_32(mport, RIO_DID_CSR,
1293 &mport->host_deviceid);
1294 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1295 mport->host_deviceid);
1296
Zhang Weie0423232008-04-18 13:33:42 -07001297 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
Alexandre Bounine17e96202011-01-12 17:00:41 -08001298 0, NULL, 0) < 0) {
Matt Portereb188d02005-11-07 01:00:17 -08001299 printk(KERN_INFO
1300 "RIO: master port %d device has failed discovery\n",
1301 mport->id);
1302 goto bail;
1303 }
1304
1305 rio_build_route_tables();
1306 }
1307
1308 return 0;
1309
1310 timeout:
1311 pr_debug("timeout\n");
1312 bail:
1313 return -EBUSY;
1314}