1 // SPDX-License-Identifier: GPL-2.0+
2 /* vim: set ts=8 sw=8 noet tw=80 nowrap: */
4 * comedi/drivers/ni_routes.c
5 * Route information for NI boards.
7 * COMEDI - Linux Control and Measurement Device Interface
8 * Copyright (C) 2016 Spencer E. Olson <olsonse@umich.edu>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 #include <linux/bsearch.h>
24 #include <linux/sort.h>
26 #include "../comedi.h"
28 #include "ni_routes.h"
29 #include "ni_routing/ni_route_values.h"
30 #include "ni_routing/ni_device_routes.h"
33 * This is defined in ni_routing/ni_route_values.h:
34 * #define B(x) ((x) - NI_NAMES_BASE)
38 * These are defined in ni_routing/ni_route_values.h to identify clearly
39 * elements of the table that were set. In other words, entries that are zero
40 * are invalid. To get the value to use for the register, one must mask out the
43 * #define V(x) ((x) | 0x80)
45 * #define UNMARK(x) ((x) & (~(0x80)))
49 /* Helper for accessing data. */
50 #define RVi(table, src, dest) ((table)[(dest) * NI_NUM_NAMES + (src)])
52 static const size_t route_table_size = NI_NUM_NAMES * NI_NUM_NAMES;
55 * Find the proper route_values and ni_device_routes tables for this particular
58 * Return: -ENODATA if either was not found; 0 if both were found.
60 static int ni_find_device_routes(const char *device_family,
61 const char *board_name,
62 struct ni_route_tables *tables)
64 const struct ni_device_routes *dr = NULL;
68 /* First, find the register_values table for this device family */
69 for (i = 0; ni_all_route_values[i]; ++i) {
70 if (memcmp(ni_all_route_values[i]->family, device_family,
71 strnlen(device_family, 30)) == 0) {
72 rv = &ni_all_route_values[i]->register_values[0][0];
80 /* Second, find the set of routes valid for this device. */
81 for (i = 0; ni_device_routes_list[i]; ++i) {
82 if (memcmp(ni_device_routes_list[i]->device, board_name,
83 strnlen(board_name, 30)) == 0) {
84 dr = ni_device_routes_list[i];
92 tables->route_values = rv;
93 tables->valid_routes = dr;
99 * ni_assign_device_routes() - Assign the proper lookup table for NI signal
100 * routing to the specified NI device.
102 * Return: -ENODATA if assignment was not successful; 0 if successful.
104 int ni_assign_device_routes(const char *device_family,
105 const char *board_name,
106 struct ni_route_tables *tables)
108 memset(tables, 0, sizeof(struct ni_route_tables));
109 return ni_find_device_routes(device_family, board_name, tables);
111 EXPORT_SYMBOL_GPL(ni_assign_device_routes);
114 * ni_count_valid_routes() - Count the number of valid routes.
115 * @tables: Routing tables for which to count all valid routes.
117 unsigned int ni_count_valid_routes(const struct ni_route_tables *tables)
122 for (i = 0; i < tables->valid_routes->n_route_sets; ++i) {
123 const struct ni_route_set *R = &tables->valid_routes->routes[i];
126 for (j = 0; j < R->n_src; ++j) {
127 const int src = R->src[j];
128 const int dest = R->dest;
129 const u8 *rv = tables->route_values;
131 if (RVi(rv, B(src), B(dest)))
132 /* direct routing is valid */
134 else if (channel_is_rtsi(dest) &&
135 (RVi(rv, B(src), B(NI_RGOUT0)) ||
136 RVi(rv, B(src), B(NI_RTSI_BRD(0))) ||
137 RVi(rv, B(src), B(NI_RTSI_BRD(1))) ||
138 RVi(rv, B(src), B(NI_RTSI_BRD(2))) ||
139 RVi(rv, B(src), B(NI_RTSI_BRD(3))))) {
146 EXPORT_SYMBOL_GPL(ni_count_valid_routes);
149 * ni_get_valid_routes() - Implements INSN_DEVICE_CONFIG_GET_ROUTES.
150 * @tables: pointer to relevant set of routing tables.
151 * @n_pairs: Number of pairs for which memory is allocated by the user. If
152 * the user specifies '0', only the number of available pairs is
154 * @pair_data: Pointer to memory allocated to return pairs back to user. Each
155 * even, odd indexed member of this array will hold source,
156 * destination of a route pair respectively.
158 * Return: the number of valid routes if n_pairs == 0; otherwise, the number of
159 * valid routes copied.
161 unsigned int ni_get_valid_routes(const struct ni_route_tables *tables,
162 unsigned int n_pairs,
163 unsigned int *pair_data)
165 unsigned int n_valid = ni_count_valid_routes(tables);
168 if (n_pairs == 0 || n_valid == 0)
176 for (i = 0; i < tables->valid_routes->n_route_sets; ++i) {
177 const struct ni_route_set *R = &tables->valid_routes->routes[i];
180 for (j = 0; j < R->n_src; ++j) {
181 const int src = R->src[j];
182 const int dest = R->dest;
184 const u8 *rv = tables->route_values;
186 if (RVi(rv, B(src), B(dest)))
187 /* direct routing is valid */
189 else if (channel_is_rtsi(dest) &&
190 (RVi(rv, B(src), B(NI_RGOUT0)) ||
191 RVi(rv, B(src), B(NI_RTSI_BRD(0))) ||
192 RVi(rv, B(src), B(NI_RTSI_BRD(1))) ||
193 RVi(rv, B(src), B(NI_RTSI_BRD(2))) ||
194 RVi(rv, B(src), B(NI_RTSI_BRD(3))))) {
195 /* indirect routing also valid */
200 pair_data[2 * n_valid] = src;
201 pair_data[2 * n_valid + 1] = dest;
205 if (n_valid >= n_pairs)
211 EXPORT_SYMBOL_GPL(ni_get_valid_routes);
214 * List of NI global signal names that, as destinations, are only routeable
215 * indirectly through the *_arg elements of the comedi_cmd structure.
217 static const int NI_CMD_DESTS[] = {
228 * ni_is_cmd_dest() - Determine whether the given destination is only
229 * configurable via a comedi_cmd struct.
230 * @dest: Destination to test.
232 bool ni_is_cmd_dest(int dest)
236 for (i = 0; i < ARRAY_SIZE(NI_CMD_DESTS); ++i)
237 if (NI_CMD_DESTS[i] == dest)
241 EXPORT_SYMBOL_GPL(ni_is_cmd_dest);
243 /* **** BEGIN Routes sort routines **** */
244 static int _ni_sort_destcmp(const void *va, const void *vb)
246 const struct ni_route_set *a = va;
247 const struct ni_route_set *b = vb;
249 if (a->dest < b->dest)
251 else if (a->dest > b->dest)
256 static int _ni_sort_srccmp(const void *vsrc0, const void *vsrc1)
258 const int *src0 = vsrc0;
259 const int *src1 = vsrc1;
263 else if (*src0 > *src1)
269 * ni_sort_device_routes() - Sort the list of valid device signal routes in
270 * preparation for use.
271 * @valid_routes: pointer to ni_device_routes struct to sort.
273 void ni_sort_device_routes(struct ni_device_routes *valid_routes)
277 /* 1. Count and set the number of ni_route_set objects. */
278 valid_routes->n_route_sets = 0;
279 while (valid_routes->routes[valid_routes->n_route_sets].dest != 0)
280 ++valid_routes->n_route_sets;
282 /* 2. sort all ni_route_set objects by destination. */
283 sort(valid_routes->routes, valid_routes->n_route_sets,
284 sizeof(struct ni_route_set), _ni_sort_destcmp, NULL);
286 /* 3. Loop through each route_set for sorting. */
287 for (n = 0; n < valid_routes->n_route_sets; ++n) {
288 struct ni_route_set *rs = &valid_routes->routes[n];
290 /* 3a. Count and set the number of sources. */
292 while (rs->src[rs->n_src])
295 /* 3a. Sort sources. */
296 sort(valid_routes->routes[n].src, valid_routes->routes[n].n_src,
297 sizeof(int), _ni_sort_srccmp, NULL);
300 EXPORT_SYMBOL_GPL(ni_sort_device_routes);
302 /* sort all valid device signal routes in prep for use */
303 static void ni_sort_all_device_routes(void)
307 for (i = 0; ni_device_routes_list[i]; ++i)
308 ni_sort_device_routes(ni_device_routes_list[i]);
311 /* **** BEGIN Routes search routines **** */
312 static int _ni_bsearch_destcmp(const void *vkey, const void *velt)
314 const int *key = vkey;
315 const struct ni_route_set *elt = velt;
317 if (*key < elt->dest)
319 else if (*key > elt->dest)
324 static int _ni_bsearch_srccmp(const void *vkey, const void *velt)
326 const int *key = vkey;
327 const int *elt = velt;
331 else if (*key > *elt)
337 * ni_find_route_set() - Finds the proper route set with the specified
339 * @destination: Destination of which to search for the route set.
340 * @valid_routes: Pointer to device routes within which to search.
342 * Return: NULL if no route_set is found with the specified @destination;
343 * otherwise, a pointer to the route_set if found.
345 const struct ni_route_set *
346 ni_find_route_set(const int destination,
347 const struct ni_device_routes *valid_routes)
349 return bsearch(&destination, valid_routes->routes,
350 valid_routes->n_route_sets, sizeof(struct ni_route_set),
351 _ni_bsearch_destcmp);
353 EXPORT_SYMBOL_GPL(ni_find_route_set);
356 * ni_route_set_has_source() - Determines whether the given source is in
357 * included given route_set.
359 * Return: true if found; false otherwise.
361 bool ni_route_set_has_source(const struct ni_route_set *routes,
364 if (!bsearch(&source, routes->src, routes->n_src, sizeof(int),
369 EXPORT_SYMBOL_GPL(ni_route_set_has_source);
372 * ni_lookup_route_register() - Look up a register value for a particular route
373 * without checking whether the route is valid for
374 * the particular device.
375 * @src: global-identifier for route source
376 * @dest: global-identifier for route destination
377 * @tables: pointer to relevant set of routing tables.
379 * Return: -EINVAL if the specified route is not valid for this device family.
381 s8 ni_lookup_route_register(int src, int dest,
382 const struct ni_route_tables *tables)
387 * Be sure to use the B() macro to subtract off the NI_NAMES_BASE before
388 * indexing into the route_values array.
392 if (src < 0 || src >= NI_NUM_NAMES || dest < 0 || dest >= NI_NUM_NAMES)
394 regval = RVi(tables->route_values, src, dest);
397 /* mask out the valid-value marking bit */
398 return UNMARK(regval);
400 EXPORT_SYMBOL_GPL(ni_lookup_route_register);
403 * ni_route_to_register() - Validates and converts the specified signal route
404 * (src-->dest) to the value used at the appropriate
406 * @src: global-identifier for route source
407 * @dest: global-identifier for route destination
408 * @tables: pointer to relevant set of routing tables.
410 * Generally speaking, most routes require the first six bits and a few require
411 * 7 bits. Special handling is given for the return value when the route is to
412 * be handled by the RTSI sub-device. In this case, the returned register may
413 * not be sufficient to define the entire route path, but rather may only
414 * indicate the intermediate route. For example, if the route must go through
415 * the RGOUT0 pin, the (src->RGOUT0) register value will be returned.
416 * Similarly, if the route must go through the NI_RTSI_BRD lines, the BIT(6)
419 * if route does not need RTSI_BRD lines:
420 * bits 0:7 : register value
421 * for a route that must go through RGOUT0 pin, this will be equal
422 * to the (src->RGOUT0) register value.
423 * else: * route is (src->RTSI_BRD(x), RTSI_BRD(x)->TRIGGER_LINE(i)) *
428 * Return: register value to be used for source at destination with special
429 * cases given above; Otherwise, -1 if the specified route is not valid for
430 * this particular device.
432 s8 ni_route_to_register(const int src, const int dest,
433 const struct ni_route_tables *tables)
435 const struct ni_route_set *routes =
436 ni_find_route_set(dest, tables->valid_routes);
440 /* first check to see if source is listed with bunch of destinations. */
443 /* 2nd, check to see if destination is in list of source's targets. */
444 if (!ni_route_set_has_source(routes, src))
447 * finally, check to see if we know how to route...
448 * Be sure to use the B() macro to subtract off the NI_NAMES_BASE before
449 * indexing into the route_values array.
451 rv = tables->route_values;
452 regval = RVi(rv, B(src), B(dest));
455 * if we did not validate the route, we'll see if we can route through
458 if (!regval && channel_is_rtsi(dest)) {
459 regval = RVi(rv, B(src), B(NI_RGOUT0));
460 if (!regval && (RVi(rv, B(src), B(NI_RTSI_BRD(0))) ||
461 RVi(rv, B(src), B(NI_RTSI_BRD(1))) ||
462 RVi(rv, B(src), B(NI_RTSI_BRD(2))) ||
463 RVi(rv, B(src), B(NI_RTSI_BRD(3)))))
469 /* mask out the valid-value marking bit */
470 return UNMARK(regval);
472 EXPORT_SYMBOL_GPL(ni_route_to_register);
475 * ni_find_route_source() - Finds the signal source corresponding to a signal
476 * route (src-->dest) of the specified routing register
477 * value and the specified route destination on the
480 * Note that this function does _not_ validate the source based on device
483 * Return: The NI signal value (e.g. NI_PFI(0) or PXI_Clk10) if found.
484 * If the source was not found (i.e. the register value is not
485 * valid for any routes to the destination), -EINVAL is returned.
487 int ni_find_route_source(const u8 src_sel_reg_value, int dest,
488 const struct ni_route_tables *tables)
492 dest = B(dest); /* subtract NI names offset */
493 /* ensure we are not going to under/over run the route value table */
494 if (dest < 0 || dest >= NI_NUM_NAMES)
496 for (src = 0; src < NI_NUM_NAMES; ++src)
497 if (RVi(tables->route_values, src, dest) ==
498 V(src_sel_reg_value))
499 return src + NI_NAMES_BASE;
502 EXPORT_SYMBOL_GPL(ni_find_route_source);
504 /* **** END Routes search routines **** */
506 /* **** BEGIN simple module entry/exit functions **** */
507 static int __init ni_routes_module_init(void)
509 ni_sort_all_device_routes();
513 static void __exit ni_routes_module_exit(void)
517 module_init(ni_routes_module_init);
518 module_exit(ni_routes_module_exit);
520 MODULE_AUTHOR("Comedi http://www.comedi.org");
521 MODULE_DESCRIPTION("Comedi helper for routing signals-->terminals for NI");
522 MODULE_LICENSE("GPL");
523 /* **** END simple module entry/exit functions **** */