Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Kontron PLD MFD core driver
4 *
5 * Copyright (c) 2010-2013 Kontron Europe GmbH
6 * Author: Michael Brunner <michael.brunner@kontron.com>
7 */
8
9#include <linux/platform_device.h>
10#include <linux/mfd/core.h>
11#include <linux/mfd/kempld.h>
12#include <linux/module.h>
13#include <linux/dmi.h>
14#include <linux/io.h>
15#include <linux/delay.h>
16#include <linux/acpi.h>
17
18#define MAX_ID_LEN 4
19static char force_device_id[MAX_ID_LEN + 1] = "";
20module_param_string(force_device_id, force_device_id,
21 sizeof(force_device_id), 0);
22MODULE_PARM_DESC(force_device_id, "Override detected product");
23
24/*
25 * Get hardware mutex to block firmware from accessing the pld.
26 * It is possible for the firmware may hold the mutex for an extended length of
27 * time. This function will block until access has been granted.
28 */
29static void kempld_get_hardware_mutex(struct kempld_device_data *pld)
30{
31 /* The mutex bit will read 1 until access has been granted */
32 while (ioread8(pld->io_index) & KEMPLD_MUTEX_KEY)
33 usleep_range(1000, 3000);
34}
35
36static void kempld_release_hardware_mutex(struct kempld_device_data *pld)
37{
38 /* The harware mutex is released when 1 is written to the mutex bit. */
39 iowrite8(KEMPLD_MUTEX_KEY, pld->io_index);
40}
41
42static int kempld_get_info_generic(struct kempld_device_data *pld)
43{
44 u16 version;
45 u8 spec;
46
47 kempld_get_mutex(pld);
48
49 version = kempld_read16(pld, KEMPLD_VERSION);
50 spec = kempld_read8(pld, KEMPLD_SPEC);
51 pld->info.buildnr = kempld_read16(pld, KEMPLD_BUILDNR);
52
53 pld->info.minor = KEMPLD_VERSION_GET_MINOR(version);
54 pld->info.major = KEMPLD_VERSION_GET_MAJOR(version);
55 pld->info.number = KEMPLD_VERSION_GET_NUMBER(version);
56 pld->info.type = KEMPLD_VERSION_GET_TYPE(version);
57
58 if (spec == 0xff) {
59 pld->info.spec_minor = 0;
60 pld->info.spec_major = 1;
61 } else {
62 pld->info.spec_minor = KEMPLD_SPEC_GET_MINOR(spec);
63 pld->info.spec_major = KEMPLD_SPEC_GET_MAJOR(spec);
64 }
65
66 if (pld->info.spec_major > 0)
67 pld->feature_mask = kempld_read16(pld, KEMPLD_FEATURE);
68 else
69 pld->feature_mask = 0;
70
71 kempld_release_mutex(pld);
72
73 return 0;
74}
75
76enum kempld_cells {
77 KEMPLD_I2C = 0,
78 KEMPLD_WDT,
79 KEMPLD_GPIO,
80 KEMPLD_UART,
81};
82
83static const char *kempld_dev_names[] = {
84 [KEMPLD_I2C] = "kempld-i2c",
85 [KEMPLD_WDT] = "kempld-wdt",
86 [KEMPLD_GPIO] = "kempld-gpio",
87 [KEMPLD_UART] = "kempld-uart",
88};
89
90#define KEMPLD_MAX_DEVS ARRAY_SIZE(kempld_dev_names)
91
92static int kempld_register_cells_generic(struct kempld_device_data *pld)
93{
94 struct mfd_cell devs[KEMPLD_MAX_DEVS] = {};
95 int i = 0;
96
97 if (pld->feature_mask & KEMPLD_FEATURE_BIT_I2C)
98 devs[i++].name = kempld_dev_names[KEMPLD_I2C];
99
100 if (pld->feature_mask & KEMPLD_FEATURE_BIT_WATCHDOG)
101 devs[i++].name = kempld_dev_names[KEMPLD_WDT];
102
103 if (pld->feature_mask & KEMPLD_FEATURE_BIT_GPIO)
104 devs[i++].name = kempld_dev_names[KEMPLD_GPIO];
105
106 if (pld->feature_mask & KEMPLD_FEATURE_MASK_UART)
107 devs[i++].name = kempld_dev_names[KEMPLD_UART];
108
109 return mfd_add_devices(pld->dev, -1, devs, i, NULL, 0, NULL);
110}
111
112static struct resource kempld_ioresource = {
113 .start = KEMPLD_IOINDEX,
114 .end = KEMPLD_IODATA,
115 .flags = IORESOURCE_IO,
116};
117
118static const struct kempld_platform_data kempld_platform_data_generic = {
119 .pld_clock = KEMPLD_CLK,
120 .ioresource = &kempld_ioresource,
121 .get_hardware_mutex = kempld_get_hardware_mutex,
122 .release_hardware_mutex = kempld_release_hardware_mutex,
123 .get_info = kempld_get_info_generic,
124 .register_cells = kempld_register_cells_generic,
125};
126
127static struct platform_device *kempld_pdev;
128
129static int kempld_create_platform_device(const struct dmi_system_id *id)
130{
131 const struct kempld_platform_data *pdata = id->driver_data;
132 int ret;
133
134 kempld_pdev = platform_device_alloc("kempld", -1);
135 if (!kempld_pdev)
136 return -ENOMEM;
137
138 ret = platform_device_add_data(kempld_pdev, pdata, sizeof(*pdata));
139 if (ret)
140 goto err;
141
142 ret = platform_device_add_resources(kempld_pdev, pdata->ioresource, 1);
143 if (ret)
144 goto err;
145
146 ret = platform_device_add(kempld_pdev);
147 if (ret)
148 goto err;
149
150 return 0;
151err:
152 platform_device_put(kempld_pdev);
153 return ret;
154}
155
156/**
157 * kempld_read8 - read 8 bit register
158 * @pld: kempld_device_data structure describing the PLD
159 * @index: register index on the chip
160 *
161 * kempld_get_mutex must be called prior to calling this function.
162 */
163u8 kempld_read8(struct kempld_device_data *pld, u8 index)
164{
165 iowrite8(index, pld->io_index);
166 return ioread8(pld->io_data);
167}
168EXPORT_SYMBOL_GPL(kempld_read8);
169
170/**
171 * kempld_write8 - write 8 bit register
172 * @pld: kempld_device_data structure describing the PLD
173 * @index: register index on the chip
174 * @data: new register value
175 *
176 * kempld_get_mutex must be called prior to calling this function.
177 */
178void kempld_write8(struct kempld_device_data *pld, u8 index, u8 data)
179{
180 iowrite8(index, pld->io_index);
181 iowrite8(data, pld->io_data);
182}
183EXPORT_SYMBOL_GPL(kempld_write8);
184
185/**
186 * kempld_read16 - read 16 bit register
187 * @pld: kempld_device_data structure describing the PLD
188 * @index: register index on the chip
189 *
190 * kempld_get_mutex must be called prior to calling this function.
191 */
192u16 kempld_read16(struct kempld_device_data *pld, u8 index)
193{
194 return kempld_read8(pld, index) | kempld_read8(pld, index + 1) << 8;
195}
196EXPORT_SYMBOL_GPL(kempld_read16);
197
198/**
199 * kempld_write16 - write 16 bit register
200 * @pld: kempld_device_data structure describing the PLD
201 * @index: register index on the chip
202 * @data: new register value
203 *
204 * kempld_get_mutex must be called prior to calling this function.
205 */
206void kempld_write16(struct kempld_device_data *pld, u8 index, u16 data)
207{
208 kempld_write8(pld, index, (u8)data);
209 kempld_write8(pld, index + 1, (u8)(data >> 8));
210}
211EXPORT_SYMBOL_GPL(kempld_write16);
212
213/**
214 * kempld_read32 - read 32 bit register
215 * @pld: kempld_device_data structure describing the PLD
216 * @index: register index on the chip
217 *
218 * kempld_get_mutex must be called prior to calling this function.
219 */
220u32 kempld_read32(struct kempld_device_data *pld, u8 index)
221{
222 return kempld_read16(pld, index) | kempld_read16(pld, index + 2) << 16;
223}
224EXPORT_SYMBOL_GPL(kempld_read32);
225
226/**
227 * kempld_write32 - write 32 bit register
228 * @pld: kempld_device_data structure describing the PLD
229 * @index: register index on the chip
230 * @data: new register value
231 *
232 * kempld_get_mutex must be called prior to calling this function.
233 */
234void kempld_write32(struct kempld_device_data *pld, u8 index, u32 data)
235{
236 kempld_write16(pld, index, (u16)data);
237 kempld_write16(pld, index + 2, (u16)(data >> 16));
238}
239EXPORT_SYMBOL_GPL(kempld_write32);
240
241/**
242 * kempld_get_mutex - acquire PLD mutex
243 * @pld: kempld_device_data structure describing the PLD
244 */
245void kempld_get_mutex(struct kempld_device_data *pld)
246{
247 const struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);
248
249 mutex_lock(&pld->lock);
250 pdata->get_hardware_mutex(pld);
251}
252EXPORT_SYMBOL_GPL(kempld_get_mutex);
253
254/**
255 * kempld_release_mutex - release PLD mutex
256 * @pld: kempld_device_data structure describing the PLD
257 */
258void kempld_release_mutex(struct kempld_device_data *pld)
259{
260 const struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);
261
262 pdata->release_hardware_mutex(pld);
263 mutex_unlock(&pld->lock);
264}
265EXPORT_SYMBOL_GPL(kempld_release_mutex);
266
267/**
268 * kempld_get_info - update device specific information
269 * @pld: kempld_device_data structure describing the PLD
270 *
271 * This function calls the configured board specific kempld_get_info_XXXX
272 * function which is responsible for gathering information about the specific
273 * hardware. The information is then stored within the pld structure.
274 */
275static int kempld_get_info(struct kempld_device_data *pld)
276{
277 int ret;
278 const struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);
279 char major, minor;
280
281 ret = pdata->get_info(pld);
282 if (ret)
283 return ret;
284
285 /* The Kontron PLD firmware version string has the following format:
286 * Pwxy.zzzz
287 * P: Fixed
288 * w: PLD number - 1 hex digit
289 * x: Major version - 1 alphanumerical digit (0-9A-V)
290 * y: Minor version - 1 alphanumerical digit (0-9A-V)
291 * zzzz: Build number - 4 zero padded hex digits */
292
293 if (pld->info.major < 10)
294 major = pld->info.major + '0';
295 else
296 major = (pld->info.major - 10) + 'A';
297 if (pld->info.minor < 10)
298 minor = pld->info.minor + '0';
299 else
300 minor = (pld->info.minor - 10) + 'A';
301
302 ret = scnprintf(pld->info.version, sizeof(pld->info.version),
303 "P%X%c%c.%04X", pld->info.number, major, minor,
304 pld->info.buildnr);
305 if (ret < 0)
306 return ret;
307
308 return 0;
309}
310
311/*
312 * kempld_register_cells - register cell drivers
313 *
314 * This function registers cell drivers for the detected hardware by calling
315 * the configured kempld_register_cells_XXXX function which is responsible
316 * to detect and register the needed cell drivers.
317 */
318static int kempld_register_cells(struct kempld_device_data *pld)
319{
320 const struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);
321
322 return pdata->register_cells(pld);
323}
324
325static const char *kempld_get_type_string(struct kempld_device_data *pld)
326{
327 const char *version_type;
328
329 switch (pld->info.type) {
330 case 0:
331 version_type = "release";
332 break;
333 case 1:
334 version_type = "debug";
335 break;
336 case 2:
337 version_type = "custom";
338 break;
339 default:
340 version_type = "unspecified";
341 break;
342 }
343
344 return version_type;
345}
346
347static ssize_t pld_version_show(struct device *dev,
348 struct device_attribute *attr, char *buf)
349{
350 struct kempld_device_data *pld = dev_get_drvdata(dev);
351
352 return sysfs_emit(buf, "%s\n", pld->info.version);
353}
354
355static ssize_t pld_specification_show(struct device *dev,
356 struct device_attribute *attr, char *buf)
357{
358 struct kempld_device_data *pld = dev_get_drvdata(dev);
359
360 return sysfs_emit(buf, "%d.%d\n", pld->info.spec_major, pld->info.spec_minor);
361}
362
363static ssize_t pld_type_show(struct device *dev,
364 struct device_attribute *attr, char *buf)
365{
366 struct kempld_device_data *pld = dev_get_drvdata(dev);
367
368 return sysfs_emit(buf, "%s\n", kempld_get_type_string(pld));
369}
370
371static DEVICE_ATTR_RO(pld_version);
372static DEVICE_ATTR_RO(pld_specification);
373static DEVICE_ATTR_RO(pld_type);
374
375static struct attribute *pld_attributes[] = {
376 &dev_attr_pld_version.attr,
377 &dev_attr_pld_specification.attr,
378 &dev_attr_pld_type.attr,
379 NULL
380};
381
382static const struct attribute_group pld_attr_group = {
383 .attrs = pld_attributes,
384};
385
386static int kempld_detect_device(struct kempld_device_data *pld)
387{
388 u8 index_reg;
389 int ret;
390
391 mutex_lock(&pld->lock);
392
393 /* Check for empty IO space */
394 index_reg = ioread8(pld->io_index);
395 if (index_reg == 0xff && ioread8(pld->io_data) == 0xff) {
396 mutex_unlock(&pld->lock);
397 return -ENODEV;
398 }
399
400 /* Release hardware mutex if acquired */
401 if (!(index_reg & KEMPLD_MUTEX_KEY)) {
402 iowrite8(KEMPLD_MUTEX_KEY, pld->io_index);
403 /* PXT and COMe-cPC2 boards may require a second release */
404 iowrite8(KEMPLD_MUTEX_KEY, pld->io_index);
405 }
406
407 mutex_unlock(&pld->lock);
408
409 ret = kempld_get_info(pld);
410 if (ret)
411 return ret;
412
413 dev_info(pld->dev, "Found Kontron PLD - %s (%s), spec %d.%d\n",
414 pld->info.version, kempld_get_type_string(pld),
415 pld->info.spec_major, pld->info.spec_minor);
416
417 ret = sysfs_create_group(&pld->dev->kobj, &pld_attr_group);
418 if (ret)
419 return ret;
420
421 ret = kempld_register_cells(pld);
422 if (ret)
423 sysfs_remove_group(&pld->dev->kobj, &pld_attr_group);
424
425 return ret;
426}
427
428#ifdef CONFIG_ACPI
429static int kempld_get_acpi_data(struct platform_device *pdev)
430{
431 struct list_head resource_list;
432 struct resource *resources;
433 struct resource_entry *rentry;
434 struct device *dev = &pdev->dev;
435 struct acpi_device *acpi_dev = ACPI_COMPANION(dev);
436 const struct kempld_platform_data *pdata;
437 int ret;
438 int count;
439
440 pdata = acpi_device_get_match_data(dev);
441 ret = platform_device_add_data(pdev, pdata,
442 sizeof(struct kempld_platform_data));
443 if (ret)
444 return ret;
445
446 INIT_LIST_HEAD(&resource_list);
447 ret = acpi_dev_get_resources(acpi_dev, &resource_list, NULL, NULL);
448 if (ret < 0)
449 goto out;
450
451 count = ret;
452
453 if (count == 0) {
454 ret = platform_device_add_resources(pdev, pdata->ioresource, 1);
455 goto out;
456 }
457
458 resources = devm_kcalloc(&acpi_dev->dev, count, sizeof(*resources),
459 GFP_KERNEL);
460 if (!resources) {
461 ret = -ENOMEM;
462 goto out;
463 }
464
465 count = 0;
466 list_for_each_entry(rentry, &resource_list, node) {
467 memcpy(&resources[count], rentry->res,
468 sizeof(*resources));
469 count++;
470 }
471 ret = platform_device_add_resources(pdev, resources, count);
472
473out:
474 acpi_dev_free_resource_list(&resource_list);
475
476 return ret;
477}
478#else
479static int kempld_get_acpi_data(struct platform_device *pdev)
480{
481 return -ENODEV;
482}
483#endif /* CONFIG_ACPI */
484
485static int kempld_probe(struct platform_device *pdev)
486{
487 const struct kempld_platform_data *pdata;
488 struct device *dev = &pdev->dev;
489 struct kempld_device_data *pld;
490 struct resource *ioport;
491 int ret;
492
493 if (kempld_pdev == NULL) {
494 /*
495 * No kempld_pdev device has been registered in kempld_init,
496 * so we seem to be probing an ACPI platform device.
497 */
498 ret = kempld_get_acpi_data(pdev);
499 if (ret)
500 return ret;
501 } else if (kempld_pdev != pdev) {
502 /*
503 * The platform device we are probing is not the one we
504 * registered in kempld_init using the DMI table, so this one
505 * comes from ACPI.
506 * As we can only probe one - abort here and use the DMI
507 * based one instead.
508 */
509 dev_notice(dev, "platform device exists - not using ACPI\n");
510 return -ENODEV;
511 }
512 pdata = dev_get_platdata(dev);
513
514 pld = devm_kzalloc(dev, sizeof(*pld), GFP_KERNEL);
515 if (!pld)
516 return -ENOMEM;
517
518 ioport = platform_get_resource(pdev, IORESOURCE_IO, 0);
519 if (!ioport)
520 return -EINVAL;
521
522 pld->io_base = devm_ioport_map(dev, ioport->start,
523 resource_size(ioport));
524 if (!pld->io_base)
525 return -ENOMEM;
526
527 pld->io_index = pld->io_base;
528 pld->io_data = pld->io_base + 1;
529 pld->pld_clock = pdata->pld_clock;
530 pld->dev = dev;
531
532 mutex_init(&pld->lock);
533 platform_set_drvdata(pdev, pld);
534
535 return kempld_detect_device(pld);
536}
537
538static void kempld_remove(struct platform_device *pdev)
539{
540 struct kempld_device_data *pld = platform_get_drvdata(pdev);
541 const struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);
542
543 sysfs_remove_group(&pld->dev->kobj, &pld_attr_group);
544
545 mfd_remove_devices(&pdev->dev);
546 pdata->release_hardware_mutex(pld);
547}
548
549#ifdef CONFIG_ACPI
550static const struct acpi_device_id kempld_acpi_table[] = {
551 { "KEM0000", (kernel_ulong_t)&kempld_platform_data_generic },
552 { "KEM0001", (kernel_ulong_t)&kempld_platform_data_generic },
553 {}
554};
555MODULE_DEVICE_TABLE(acpi, kempld_acpi_table);
556#endif
557
558static struct platform_driver kempld_driver = {
559 .driver = {
560 .name = "kempld",
561 .acpi_match_table = ACPI_PTR(kempld_acpi_table),
562 },
563 .probe = kempld_probe,
564 .remove_new = kempld_remove,
565};
566
567static const struct dmi_system_id kempld_dmi_table[] __initconst = {
568 {
569 .ident = "BBD6",
570 .matches = {
571 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
572 DMI_MATCH(DMI_BOARD_NAME, "COMe-bBD"),
573 },
574 .driver_data = (void *)&kempld_platform_data_generic,
575 .callback = kempld_create_platform_device,
576 }, {
577 .ident = "BBL6",
578 .matches = {
579 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
580 DMI_MATCH(DMI_BOARD_NAME, "COMe-bBL6"),
581 },
582 .driver_data = (void *)&kempld_platform_data_generic,
583 .callback = kempld_create_platform_device,
584 }, {
585 .ident = "BDV7",
586 .matches = {
587 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
588 DMI_MATCH(DMI_BOARD_NAME, "COMe-bDV7"),
589 },
590 .driver_data = (void *)&kempld_platform_data_generic,
591 .callback = kempld_create_platform_device,
592 }, {
593 .ident = "BHL6",
594 .matches = {
595 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
596 DMI_MATCH(DMI_BOARD_NAME, "COMe-bHL6"),
597 },
598 .driver_data = (void *)&kempld_platform_data_generic,
599 .callback = kempld_create_platform_device,
600 }, {
601 .ident = "BKL6",
602 .matches = {
603 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
604 DMI_MATCH(DMI_BOARD_NAME, "COMe-bKL6"),
605 },
606 .driver_data = (void *)&kempld_platform_data_generic,
607 .callback = kempld_create_platform_device,
608 }, {
609 .ident = "BSL6",
610 .matches = {
611 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
612 DMI_MATCH(DMI_BOARD_NAME, "COMe-bSL6"),
613 },
614 .driver_data = (void *)&kempld_platform_data_generic,
615 .callback = kempld_create_platform_device,
616 }, {
617 .ident = "CAL6",
618 .matches = {
619 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
620 DMI_MATCH(DMI_BOARD_NAME, "COMe-cAL"),
621 },
622 .driver_data = (void *)&kempld_platform_data_generic,
623 .callback = kempld_create_platform_device,
624 }, {
625 .ident = "CBL6",
626 .matches = {
627 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
628 DMI_MATCH(DMI_BOARD_NAME, "COMe-cBL6"),
629 },
630 .driver_data = (void *)&kempld_platform_data_generic,
631 .callback = kempld_create_platform_device,
632 }, {
633 .ident = "CBW6",
634 .matches = {
635 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
636 DMI_MATCH(DMI_BOARD_NAME, "COMe-cBW6"),
637 },
638 .driver_data = (void *)&kempld_platform_data_generic,
639 .callback = kempld_create_platform_device,
640 }, {
641 .ident = "CCR2",
642 .matches = {
643 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
644 DMI_MATCH(DMI_BOARD_NAME, "COMe-bIP2"),
645 },
646 .driver_data = (void *)&kempld_platform_data_generic,
647 .callback = kempld_create_platform_device,
648 }, {
649 .ident = "CCR6",
650 .matches = {
651 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
652 DMI_MATCH(DMI_BOARD_NAME, "COMe-bIP6"),
653 },
654 .driver_data = (void *)&kempld_platform_data_generic,
655 .callback = kempld_create_platform_device,
656 }, {
657 .ident = "CDV7",
658 .matches = {
659 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
660 DMI_MATCH(DMI_BOARD_NAME, "COMe-cDV7"),
661 },
662 .driver_data = (void *)&kempld_platform_data_generic,
663 .callback = kempld_create_platform_device,
664 }, {
665 .ident = "CHL6",
666 .matches = {
667 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
668 DMI_MATCH(DMI_BOARD_NAME, "COMe-cHL6"),
669 },
670 .driver_data = (void *)&kempld_platform_data_generic,
671 .callback = kempld_create_platform_device,
672 }, {
673 .ident = "CHR2",
674 .matches = {
675 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
676 DMI_MATCH(DMI_BOARD_NAME, "ETXexpress-SC T2"),
677 },
678 .driver_data = (void *)&kempld_platform_data_generic,
679 .callback = kempld_create_platform_device,
680 }, {
681 .ident = "CHR2",
682 .matches = {
683 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
684 DMI_MATCH(DMI_BOARD_NAME, "ETXe-SC T2"),
685 },
686 .driver_data = (void *)&kempld_platform_data_generic,
687 .callback = kempld_create_platform_device,
688 }, {
689 .ident = "CHR2",
690 .matches = {
691 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
692 DMI_MATCH(DMI_BOARD_NAME, "COMe-bSC2"),
693 },
694 .driver_data = (void *)&kempld_platform_data_generic,
695 .callback = kempld_create_platform_device,
696 }, {
697 .ident = "CHR6",
698 .matches = {
699 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
700 DMI_MATCH(DMI_BOARD_NAME, "ETXexpress-SC T6"),
701 },
702 .driver_data = (void *)&kempld_platform_data_generic,
703 .callback = kempld_create_platform_device,
704 }, {
705 .ident = "CHR6",
706 .matches = {
707 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
708 DMI_MATCH(DMI_BOARD_NAME, "ETXe-SC T6"),
709 },
710 .driver_data = (void *)&kempld_platform_data_generic,
711 .callback = kempld_create_platform_device,
712 }, {
713 .ident = "CHR6",
714 .matches = {
715 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
716 DMI_MATCH(DMI_BOARD_NAME, "COMe-bSC6"),
717 },
718 .driver_data = (void *)&kempld_platform_data_generic,
719 .callback = kempld_create_platform_device,
720 }, {
721 .ident = "CKL6",
722 .matches = {
723 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
724 DMI_MATCH(DMI_BOARD_NAME, "COMe-cKL6"),
725 },
726 .driver_data = (void *)&kempld_platform_data_generic,
727 .callback = kempld_create_platform_device,
728 }, {
729 .ident = "CNTG",
730 .matches = {
731 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
732 DMI_MATCH(DMI_BOARD_NAME, "ETXexpress-PC"),
733 },
734 .driver_data = (void *)&kempld_platform_data_generic,
735 .callback = kempld_create_platform_device,
736 }, {
737 .ident = "CNTG",
738 .matches = {
739 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
740 DMI_MATCH(DMI_BOARD_NAME, "COMe-bPC2"),
741 },
742 .driver_data = (void *)&kempld_platform_data_generic,
743 .callback = kempld_create_platform_device,
744 }, {
745 .ident = "CNTX",
746 .matches = {
747 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
748 DMI_MATCH(DMI_BOARD_NAME, "PXT"),
749 },
750 .driver_data = (void *)&kempld_platform_data_generic,
751 .callback = kempld_create_platform_device,
752 }, {
753 .ident = "CSL6",
754 .matches = {
755 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
756 DMI_MATCH(DMI_BOARD_NAME, "COMe-cSL6"),
757 },
758 .driver_data = (void *)&kempld_platform_data_generic,
759 .callback = kempld_create_platform_device,
760 }, {
761 .ident = "CVV6",
762 .matches = {
763 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
764 DMI_MATCH(DMI_BOARD_NAME, "COMe-cBT"),
765 },
766 .driver_data = (void *)&kempld_platform_data_generic,
767 .callback = kempld_create_platform_device,
768 }, {
769 .ident = "FRI2",
770 .matches = {
771 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
772 DMI_MATCH(DMI_BIOS_VERSION, "FRI2"),
773 },
774 .driver_data = (void *)&kempld_platform_data_generic,
775 .callback = kempld_create_platform_device,
776 }, {
777 .ident = "FRI2",
778 .matches = {
779 DMI_MATCH(DMI_PRODUCT_NAME, "Fish River Island II"),
780 },
781 .driver_data = (void *)&kempld_platform_data_generic,
782 .callback = kempld_create_platform_device,
783 }, {
784 .ident = "A203",
785 .matches = {
786 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
787 DMI_MATCH(DMI_BOARD_NAME, "KBox A-203"),
788 },
789 .driver_data = (void *)&kempld_platform_data_generic,
790 .callback = kempld_create_platform_device,
791 }, {
792 .ident = "M4A1",
793 .matches = {
794 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
795 DMI_MATCH(DMI_BOARD_NAME, "COMe-m4AL"),
796 },
797 .driver_data = (void *)&kempld_platform_data_generic,
798 .callback = kempld_create_platform_device,
799 }, {
800 .ident = "MAL1",
801 .matches = {
802 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
803 DMI_MATCH(DMI_BOARD_NAME, "COMe-mAL10"),
804 },
805 .driver_data = (void *)&kempld_platform_data_generic,
806 .callback = kempld_create_platform_device,
807 }, {
808 .ident = "MAPL",
809 .matches = {
810 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
811 DMI_MATCH(DMI_BOARD_NAME, "mITX-APL"),
812 },
813 .driver_data = (void *)&kempld_platform_data_generic,
814 .callback = kempld_create_platform_device,
815 }, {
816 .ident = "MBR1",
817 .matches = {
818 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
819 DMI_MATCH(DMI_BOARD_NAME, "ETX-OH"),
820 },
821 .driver_data = (void *)&kempld_platform_data_generic,
822 .callback = kempld_create_platform_device,
823 }, {
824 .ident = "MVV1",
825 .matches = {
826 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
827 DMI_MATCH(DMI_BOARD_NAME, "COMe-mBT"),
828 },
829 .driver_data = (void *)&kempld_platform_data_generic,
830 .callback = kempld_create_platform_device,
831 }, {
832 .ident = "NTC1",
833 .matches = {
834 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
835 DMI_MATCH(DMI_BOARD_NAME, "nanoETXexpress-TT"),
836 },
837 .driver_data = (void *)&kempld_platform_data_generic,
838 .callback = kempld_create_platform_device,
839 }, {
840 .ident = "NTC1",
841 .matches = {
842 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
843 DMI_MATCH(DMI_BOARD_NAME, "nETXe-TT"),
844 },
845 .driver_data = (void *)&kempld_platform_data_generic,
846 .callback = kempld_create_platform_device,
847 }, {
848 .ident = "NTC1",
849 .matches = {
850 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
851 DMI_MATCH(DMI_BOARD_NAME, "COMe-mTT"),
852 },
853 .driver_data = (void *)&kempld_platform_data_generic,
854 .callback = kempld_create_platform_device,
855 }, {
856 .ident = "NUP1",
857 .matches = {
858 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
859 DMI_MATCH(DMI_BOARD_NAME, "COMe-mCT"),
860 },
861 .driver_data = (void *)&kempld_platform_data_generic,
862 .callback = kempld_create_platform_device,
863 }, {
864 .ident = "PAPL",
865 .matches = {
866 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
867 DMI_MATCH(DMI_BOARD_NAME, "pITX-APL"),
868 },
869 .driver_data = (void *)&kempld_platform_data_generic,
870 .callback = kempld_create_platform_device,
871 }, {
872 .ident = "SXAL",
873 .matches = {
874 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
875 DMI_MATCH(DMI_BOARD_NAME, "SMARC-sXAL"),
876 },
877 .driver_data = (void *)&kempld_platform_data_generic,
878 .callback = kempld_create_platform_device,
879 }, {
880 .ident = "SXAL4",
881 .matches = {
882 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
883 DMI_MATCH(DMI_BOARD_NAME, "SMARC-sXA4"),
884 },
885 .driver_data = (void *)&kempld_platform_data_generic,
886 .callback = kempld_create_platform_device,
887 }, {
888 .ident = "UNP1",
889 .matches = {
890 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
891 DMI_MATCH(DMI_BOARD_NAME, "microETXexpress-DC"),
892 },
893 .driver_data = (void *)&kempld_platform_data_generic,
894 .callback = kempld_create_platform_device,
895 }, {
896 .ident = "UNP1",
897 .matches = {
898 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
899 DMI_MATCH(DMI_BOARD_NAME, "COMe-cDC2"),
900 },
901 .driver_data = (void *)&kempld_platform_data_generic,
902 .callback = kempld_create_platform_device,
903 }, {
904 .ident = "UNTG",
905 .matches = {
906 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
907 DMI_MATCH(DMI_BOARD_NAME, "microETXexpress-PC"),
908 },
909 .driver_data = (void *)&kempld_platform_data_generic,
910 .callback = kempld_create_platform_device,
911 }, {
912 .ident = "UNTG",
913 .matches = {
914 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
915 DMI_MATCH(DMI_BOARD_NAME, "COMe-cPC2"),
916 },
917 .driver_data = (void *)&kempld_platform_data_generic,
918 .callback = kempld_create_platform_device,
919 }, {
920 .ident = "UUP6",
921 .matches = {
922 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
923 DMI_MATCH(DMI_BOARD_NAME, "COMe-cCT6"),
924 },
925 .driver_data = (void *)&kempld_platform_data_generic,
926 .callback = kempld_create_platform_device,
927 }, {
928 .ident = "UTH6",
929 .matches = {
930 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
931 DMI_MATCH(DMI_BOARD_NAME, "COMe-cTH6"),
932 },
933 .driver_data = (void *)&kempld_platform_data_generic,
934 .callback = kempld_create_platform_device,
935 }, {
936 .ident = "Q7AL",
937 .matches = {
938 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
939 DMI_MATCH(DMI_BOARD_NAME, "Qseven-Q7AL"),
940 },
941 .driver_data = (void *)&kempld_platform_data_generic,
942 .callback = kempld_create_platform_device,
943 },
944 {}
945};
946MODULE_DEVICE_TABLE(dmi, kempld_dmi_table);
947
948static int __init kempld_init(void)
949{
950 const struct dmi_system_id *id;
951
952 if (force_device_id[0]) {
953 for (id = kempld_dmi_table;
954 id->matches[0].slot != DMI_NONE; id++)
955 if (strstr(id->ident, force_device_id))
956 if (id->callback && !id->callback(id))
957 break;
958 if (id->matches[0].slot == DMI_NONE)
959 return -ENODEV;
960 } else {
961 dmi_check_system(kempld_dmi_table);
962 }
963
964 return platform_driver_register(&kempld_driver);
965}
966
967static void __exit kempld_exit(void)
968{
969 if (kempld_pdev)
970 platform_device_unregister(kempld_pdev);
971
972 platform_driver_unregister(&kempld_driver);
973}
974
975module_init(kempld_init);
976module_exit(kempld_exit);
977
978MODULE_DESCRIPTION("KEM PLD Core Driver");
979MODULE_AUTHOR("Michael Brunner <michael.brunner@kontron.com>");
980MODULE_LICENSE("GPL");
981MODULE_ALIAS("platform:kempld-core");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Kontron PLD MFD core driver
4 *
5 * Copyright (c) 2010-2013 Kontron Europe GmbH
6 * Author: Michael Brunner <michael.brunner@kontron.com>
7 */
8
9#include <linux/platform_device.h>
10#include <linux/mfd/core.h>
11#include <linux/mfd/kempld.h>
12#include <linux/module.h>
13#include <linux/dmi.h>
14#include <linux/io.h>
15#include <linux/delay.h>
16
17#define MAX_ID_LEN 4
18static char force_device_id[MAX_ID_LEN + 1] = "";
19module_param_string(force_device_id, force_device_id,
20 sizeof(force_device_id), 0);
21MODULE_PARM_DESC(force_device_id, "Override detected product");
22
23/*
24 * Get hardware mutex to block firmware from accessing the pld.
25 * It is possible for the firmware may hold the mutex for an extended length of
26 * time. This function will block until access has been granted.
27 */
28static void kempld_get_hardware_mutex(struct kempld_device_data *pld)
29{
30 /* The mutex bit will read 1 until access has been granted */
31 while (ioread8(pld->io_index) & KEMPLD_MUTEX_KEY)
32 usleep_range(1000, 3000);
33}
34
35static void kempld_release_hardware_mutex(struct kempld_device_data *pld)
36{
37 /* The harware mutex is released when 1 is written to the mutex bit. */
38 iowrite8(KEMPLD_MUTEX_KEY, pld->io_index);
39}
40
41static int kempld_get_info_generic(struct kempld_device_data *pld)
42{
43 u16 version;
44 u8 spec;
45
46 kempld_get_mutex(pld);
47
48 version = kempld_read16(pld, KEMPLD_VERSION);
49 spec = kempld_read8(pld, KEMPLD_SPEC);
50 pld->info.buildnr = kempld_read16(pld, KEMPLD_BUILDNR);
51
52 pld->info.minor = KEMPLD_VERSION_GET_MINOR(version);
53 pld->info.major = KEMPLD_VERSION_GET_MAJOR(version);
54 pld->info.number = KEMPLD_VERSION_GET_NUMBER(version);
55 pld->info.type = KEMPLD_VERSION_GET_TYPE(version);
56
57 if (spec == 0xff) {
58 pld->info.spec_minor = 0;
59 pld->info.spec_major = 1;
60 } else {
61 pld->info.spec_minor = KEMPLD_SPEC_GET_MINOR(spec);
62 pld->info.spec_major = KEMPLD_SPEC_GET_MAJOR(spec);
63 }
64
65 if (pld->info.spec_major > 0)
66 pld->feature_mask = kempld_read16(pld, KEMPLD_FEATURE);
67 else
68 pld->feature_mask = 0;
69
70 kempld_release_mutex(pld);
71
72 return 0;
73}
74
75enum kempld_cells {
76 KEMPLD_I2C = 0,
77 KEMPLD_WDT,
78 KEMPLD_GPIO,
79 KEMPLD_UART,
80};
81
82static const char *kempld_dev_names[] = {
83 [KEMPLD_I2C] = "kempld-i2c",
84 [KEMPLD_WDT] = "kempld-wdt",
85 [KEMPLD_GPIO] = "kempld-gpio",
86 [KEMPLD_UART] = "kempld-uart",
87};
88
89#define KEMPLD_MAX_DEVS ARRAY_SIZE(kempld_dev_names)
90
91static int kempld_register_cells_generic(struct kempld_device_data *pld)
92{
93 struct mfd_cell devs[KEMPLD_MAX_DEVS] = {};
94 int i = 0;
95
96 if (pld->feature_mask & KEMPLD_FEATURE_BIT_I2C)
97 devs[i++].name = kempld_dev_names[KEMPLD_I2C];
98
99 if (pld->feature_mask & KEMPLD_FEATURE_BIT_WATCHDOG)
100 devs[i++].name = kempld_dev_names[KEMPLD_WDT];
101
102 if (pld->feature_mask & KEMPLD_FEATURE_BIT_GPIO)
103 devs[i++].name = kempld_dev_names[KEMPLD_GPIO];
104
105 if (pld->feature_mask & KEMPLD_FEATURE_MASK_UART)
106 devs[i++].name = kempld_dev_names[KEMPLD_UART];
107
108 return mfd_add_devices(pld->dev, -1, devs, i, NULL, 0, NULL);
109}
110
111static struct resource kempld_ioresource = {
112 .start = KEMPLD_IOINDEX,
113 .end = KEMPLD_IODATA,
114 .flags = IORESOURCE_IO,
115};
116
117static const struct kempld_platform_data kempld_platform_data_generic = {
118 .pld_clock = KEMPLD_CLK,
119 .ioresource = &kempld_ioresource,
120 .get_hardware_mutex = kempld_get_hardware_mutex,
121 .release_hardware_mutex = kempld_release_hardware_mutex,
122 .get_info = kempld_get_info_generic,
123 .register_cells = kempld_register_cells_generic,
124};
125
126static struct platform_device *kempld_pdev;
127
128static int kempld_create_platform_device(const struct dmi_system_id *id)
129{
130 const struct kempld_platform_data *pdata = id->driver_data;
131 int ret;
132
133 kempld_pdev = platform_device_alloc("kempld", -1);
134 if (!kempld_pdev)
135 return -ENOMEM;
136
137 ret = platform_device_add_data(kempld_pdev, pdata, sizeof(*pdata));
138 if (ret)
139 goto err;
140
141 ret = platform_device_add_resources(kempld_pdev, pdata->ioresource, 1);
142 if (ret)
143 goto err;
144
145 ret = platform_device_add(kempld_pdev);
146 if (ret)
147 goto err;
148
149 return 0;
150err:
151 platform_device_put(kempld_pdev);
152 return ret;
153}
154
155/**
156 * kempld_read8 - read 8 bit register
157 * @pld: kempld_device_data structure describing the PLD
158 * @index: register index on the chip
159 *
160 * kempld_get_mutex must be called prior to calling this function.
161 */
162u8 kempld_read8(struct kempld_device_data *pld, u8 index)
163{
164 iowrite8(index, pld->io_index);
165 return ioread8(pld->io_data);
166}
167EXPORT_SYMBOL_GPL(kempld_read8);
168
169/**
170 * kempld_write8 - write 8 bit register
171 * @pld: kempld_device_data structure describing the PLD
172 * @index: register index on the chip
173 * @data: new register value
174 *
175 * kempld_get_mutex must be called prior to calling this function.
176 */
177void kempld_write8(struct kempld_device_data *pld, u8 index, u8 data)
178{
179 iowrite8(index, pld->io_index);
180 iowrite8(data, pld->io_data);
181}
182EXPORT_SYMBOL_GPL(kempld_write8);
183
184/**
185 * kempld_read16 - read 16 bit register
186 * @pld: kempld_device_data structure describing the PLD
187 * @index: register index on the chip
188 *
189 * kempld_get_mutex must be called prior to calling this function.
190 */
191u16 kempld_read16(struct kempld_device_data *pld, u8 index)
192{
193 return kempld_read8(pld, index) | kempld_read8(pld, index + 1) << 8;
194}
195EXPORT_SYMBOL_GPL(kempld_read16);
196
197/**
198 * kempld_write16 - write 16 bit register
199 * @pld: kempld_device_data structure describing the PLD
200 * @index: register index on the chip
201 * @data: new register value
202 *
203 * kempld_get_mutex must be called prior to calling this function.
204 */
205void kempld_write16(struct kempld_device_data *pld, u8 index, u16 data)
206{
207 kempld_write8(pld, index, (u8)data);
208 kempld_write8(pld, index + 1, (u8)(data >> 8));
209}
210EXPORT_SYMBOL_GPL(kempld_write16);
211
212/**
213 * kempld_read32 - read 32 bit register
214 * @pld: kempld_device_data structure describing the PLD
215 * @index: register index on the chip
216 *
217 * kempld_get_mutex must be called prior to calling this function.
218 */
219u32 kempld_read32(struct kempld_device_data *pld, u8 index)
220{
221 return kempld_read16(pld, index) | kempld_read16(pld, index + 2) << 16;
222}
223EXPORT_SYMBOL_GPL(kempld_read32);
224
225/**
226 * kempld_write32 - write 32 bit register
227 * @pld: kempld_device_data structure describing the PLD
228 * @index: register index on the chip
229 * @data: new register value
230 *
231 * kempld_get_mutex must be called prior to calling this function.
232 */
233void kempld_write32(struct kempld_device_data *pld, u8 index, u32 data)
234{
235 kempld_write16(pld, index, (u16)data);
236 kempld_write16(pld, index + 2, (u16)(data >> 16));
237}
238EXPORT_SYMBOL_GPL(kempld_write32);
239
240/**
241 * kempld_get_mutex - acquire PLD mutex
242 * @pld: kempld_device_data structure describing the PLD
243 */
244void kempld_get_mutex(struct kempld_device_data *pld)
245{
246 const struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);
247
248 mutex_lock(&pld->lock);
249 pdata->get_hardware_mutex(pld);
250}
251EXPORT_SYMBOL_GPL(kempld_get_mutex);
252
253/**
254 * kempld_release_mutex - release PLD mutex
255 * @pld: kempld_device_data structure describing the PLD
256 */
257void kempld_release_mutex(struct kempld_device_data *pld)
258{
259 const struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);
260
261 pdata->release_hardware_mutex(pld);
262 mutex_unlock(&pld->lock);
263}
264EXPORT_SYMBOL_GPL(kempld_release_mutex);
265
266/**
267 * kempld_get_info - update device specific information
268 * @pld: kempld_device_data structure describing the PLD
269 *
270 * This function calls the configured board specific kempld_get_info_XXXX
271 * function which is responsible for gathering information about the specific
272 * hardware. The information is then stored within the pld structure.
273 */
274static int kempld_get_info(struct kempld_device_data *pld)
275{
276 int ret;
277 const struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);
278 char major, minor;
279
280 ret = pdata->get_info(pld);
281 if (ret)
282 return ret;
283
284 /* The Kontron PLD firmware version string has the following format:
285 * Pwxy.zzzz
286 * P: Fixed
287 * w: PLD number - 1 hex digit
288 * x: Major version - 1 alphanumerical digit (0-9A-V)
289 * y: Minor version - 1 alphanumerical digit (0-9A-V)
290 * zzzz: Build number - 4 zero padded hex digits */
291
292 if (pld->info.major < 10)
293 major = pld->info.major + '0';
294 else
295 major = (pld->info.major - 10) + 'A';
296 if (pld->info.minor < 10)
297 minor = pld->info.minor + '0';
298 else
299 minor = (pld->info.minor - 10) + 'A';
300
301 ret = scnprintf(pld->info.version, sizeof(pld->info.version),
302 "P%X%c%c.%04X", pld->info.number, major, minor,
303 pld->info.buildnr);
304 if (ret < 0)
305 return ret;
306
307 return 0;
308}
309
310/*
311 * kempld_register_cells - register cell drivers
312 *
313 * This function registers cell drivers for the detected hardware by calling
314 * the configured kempld_register_cells_XXXX function which is responsible
315 * to detect and register the needed cell drivers.
316 */
317static int kempld_register_cells(struct kempld_device_data *pld)
318{
319 const struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);
320
321 return pdata->register_cells(pld);
322}
323
324static const char *kempld_get_type_string(struct kempld_device_data *pld)
325{
326 const char *version_type;
327
328 switch (pld->info.type) {
329 case 0:
330 version_type = "release";
331 break;
332 case 1:
333 version_type = "debug";
334 break;
335 case 2:
336 version_type = "custom";
337 break;
338 default:
339 version_type = "unspecified";
340 break;
341 }
342
343 return version_type;
344}
345
346static ssize_t kempld_version_show(struct device *dev,
347 struct device_attribute *attr, char *buf)
348{
349 struct kempld_device_data *pld = dev_get_drvdata(dev);
350
351 return scnprintf(buf, PAGE_SIZE, "%s\n", pld->info.version);
352}
353
354static ssize_t kempld_specification_show(struct device *dev,
355 struct device_attribute *attr, char *buf)
356{
357 struct kempld_device_data *pld = dev_get_drvdata(dev);
358
359 return scnprintf(buf, PAGE_SIZE, "%d.%d\n", pld->info.spec_major,
360 pld->info.spec_minor);
361}
362
363static ssize_t kempld_type_show(struct device *dev,
364 struct device_attribute *attr, char *buf)
365{
366 struct kempld_device_data *pld = dev_get_drvdata(dev);
367
368 return scnprintf(buf, PAGE_SIZE, "%s\n", kempld_get_type_string(pld));
369}
370
371static DEVICE_ATTR(pld_version, S_IRUGO, kempld_version_show, NULL);
372static DEVICE_ATTR(pld_specification, S_IRUGO, kempld_specification_show,
373 NULL);
374static DEVICE_ATTR(pld_type, S_IRUGO, kempld_type_show, NULL);
375
376static struct attribute *pld_attributes[] = {
377 &dev_attr_pld_version.attr,
378 &dev_attr_pld_specification.attr,
379 &dev_attr_pld_type.attr,
380 NULL
381};
382
383static const struct attribute_group pld_attr_group = {
384 .attrs = pld_attributes,
385};
386
387static int kempld_detect_device(struct kempld_device_data *pld)
388{
389 u8 index_reg;
390 int ret;
391
392 mutex_lock(&pld->lock);
393
394 /* Check for empty IO space */
395 index_reg = ioread8(pld->io_index);
396 if (index_reg == 0xff && ioread8(pld->io_data) == 0xff) {
397 mutex_unlock(&pld->lock);
398 return -ENODEV;
399 }
400
401 /* Release hardware mutex if acquired */
402 if (!(index_reg & KEMPLD_MUTEX_KEY)) {
403 iowrite8(KEMPLD_MUTEX_KEY, pld->io_index);
404 /* PXT and COMe-cPC2 boards may require a second release */
405 iowrite8(KEMPLD_MUTEX_KEY, pld->io_index);
406 }
407
408 mutex_unlock(&pld->lock);
409
410 ret = kempld_get_info(pld);
411 if (ret)
412 return ret;
413
414 dev_info(pld->dev, "Found Kontron PLD - %s (%s), spec %d.%d\n",
415 pld->info.version, kempld_get_type_string(pld),
416 pld->info.spec_major, pld->info.spec_minor);
417
418 ret = sysfs_create_group(&pld->dev->kobj, &pld_attr_group);
419 if (ret)
420 return ret;
421
422 ret = kempld_register_cells(pld);
423 if (ret)
424 sysfs_remove_group(&pld->dev->kobj, &pld_attr_group);
425
426 return ret;
427}
428
429static int kempld_probe(struct platform_device *pdev)
430{
431 const struct kempld_platform_data *pdata =
432 dev_get_platdata(&pdev->dev);
433 struct device *dev = &pdev->dev;
434 struct kempld_device_data *pld;
435 struct resource *ioport;
436
437 pld = devm_kzalloc(dev, sizeof(*pld), GFP_KERNEL);
438 if (!pld)
439 return -ENOMEM;
440
441 ioport = platform_get_resource(pdev, IORESOURCE_IO, 0);
442 if (!ioport)
443 return -EINVAL;
444
445 pld->io_base = devm_ioport_map(dev, ioport->start,
446 resource_size(ioport));
447 if (!pld->io_base)
448 return -ENOMEM;
449
450 pld->io_index = pld->io_base;
451 pld->io_data = pld->io_base + 1;
452 pld->pld_clock = pdata->pld_clock;
453 pld->dev = dev;
454
455 mutex_init(&pld->lock);
456 platform_set_drvdata(pdev, pld);
457
458 return kempld_detect_device(pld);
459}
460
461static int kempld_remove(struct platform_device *pdev)
462{
463 struct kempld_device_data *pld = platform_get_drvdata(pdev);
464 const struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);
465
466 sysfs_remove_group(&pld->dev->kobj, &pld_attr_group);
467
468 mfd_remove_devices(&pdev->dev);
469 pdata->release_hardware_mutex(pld);
470
471 return 0;
472}
473
474static struct platform_driver kempld_driver = {
475 .driver = {
476 .name = "kempld",
477 },
478 .probe = kempld_probe,
479 .remove = kempld_remove,
480};
481
482static const struct dmi_system_id kempld_dmi_table[] __initconst = {
483 {
484 .ident = "BBD6",
485 .matches = {
486 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
487 DMI_MATCH(DMI_BOARD_NAME, "COMe-bBD"),
488 },
489 .driver_data = (void *)&kempld_platform_data_generic,
490 .callback = kempld_create_platform_device,
491 }, {
492 .ident = "BBL6",
493 .matches = {
494 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
495 DMI_MATCH(DMI_BOARD_NAME, "COMe-bBL6"),
496 },
497 .driver_data = (void *)&kempld_platform_data_generic,
498 .callback = kempld_create_platform_device,
499 }, {
500 .ident = "BHL6",
501 .matches = {
502 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
503 DMI_MATCH(DMI_BOARD_NAME, "COMe-bHL6"),
504 },
505 .driver_data = (void *)&kempld_platform_data_generic,
506 .callback = kempld_create_platform_device,
507 }, {
508 .ident = "BKL6",
509 .matches = {
510 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
511 DMI_MATCH(DMI_BOARD_NAME, "COMe-bKL6"),
512 },
513 .driver_data = (void *)&kempld_platform_data_generic,
514 .callback = kempld_create_platform_device,
515 }, {
516 .ident = "BSL6",
517 .matches = {
518 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
519 DMI_MATCH(DMI_BOARD_NAME, "COMe-bSL6"),
520 },
521 .driver_data = (void *)&kempld_platform_data_generic,
522 .callback = kempld_create_platform_device,
523 }, {
524 .ident = "CAL6",
525 .matches = {
526 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
527 DMI_MATCH(DMI_BOARD_NAME, "COMe-cAL"),
528 },
529 .driver_data = (void *)&kempld_platform_data_generic,
530 .callback = kempld_create_platform_device,
531 }, {
532 .ident = "CBL6",
533 .matches = {
534 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
535 DMI_MATCH(DMI_BOARD_NAME, "COMe-cBL6"),
536 },
537 .driver_data = (void *)&kempld_platform_data_generic,
538 .callback = kempld_create_platform_device,
539 }, {
540 .ident = "CBW6",
541 .matches = {
542 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
543 DMI_MATCH(DMI_BOARD_NAME, "COMe-cBW6"),
544 },
545 .driver_data = (void *)&kempld_platform_data_generic,
546 .callback = kempld_create_platform_device,
547 }, {
548 .ident = "CCR2",
549 .matches = {
550 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
551 DMI_MATCH(DMI_BOARD_NAME, "COMe-bIP2"),
552 },
553 .driver_data = (void *)&kempld_platform_data_generic,
554 .callback = kempld_create_platform_device,
555 }, {
556 .ident = "CCR6",
557 .matches = {
558 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
559 DMI_MATCH(DMI_BOARD_NAME, "COMe-bIP6"),
560 },
561 .driver_data = (void *)&kempld_platform_data_generic,
562 .callback = kempld_create_platform_device,
563 }, {
564 .ident = "CHL6",
565 .matches = {
566 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
567 DMI_MATCH(DMI_BOARD_NAME, "COMe-cHL6"),
568 },
569 .driver_data = (void *)&kempld_platform_data_generic,
570 .callback = kempld_create_platform_device,
571 }, {
572 .ident = "CHR2",
573 .matches = {
574 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
575 DMI_MATCH(DMI_BOARD_NAME, "ETXexpress-SC T2"),
576 },
577 .driver_data = (void *)&kempld_platform_data_generic,
578 .callback = kempld_create_platform_device,
579 }, {
580 .ident = "CHR2",
581 .matches = {
582 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
583 DMI_MATCH(DMI_BOARD_NAME, "ETXe-SC T2"),
584 },
585 .driver_data = (void *)&kempld_platform_data_generic,
586 .callback = kempld_create_platform_device,
587 }, {
588 .ident = "CHR2",
589 .matches = {
590 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
591 DMI_MATCH(DMI_BOARD_NAME, "COMe-bSC2"),
592 },
593 .driver_data = (void *)&kempld_platform_data_generic,
594 .callback = kempld_create_platform_device,
595 }, {
596 .ident = "CHR6",
597 .matches = {
598 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
599 DMI_MATCH(DMI_BOARD_NAME, "ETXexpress-SC T6"),
600 },
601 .driver_data = (void *)&kempld_platform_data_generic,
602 .callback = kempld_create_platform_device,
603 }, {
604 .ident = "CHR6",
605 .matches = {
606 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
607 DMI_MATCH(DMI_BOARD_NAME, "ETXe-SC T6"),
608 },
609 .driver_data = (void *)&kempld_platform_data_generic,
610 .callback = kempld_create_platform_device,
611 }, {
612 .ident = "CHR6",
613 .matches = {
614 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
615 DMI_MATCH(DMI_BOARD_NAME, "COMe-bSC6"),
616 },
617 .driver_data = (void *)&kempld_platform_data_generic,
618 .callback = kempld_create_platform_device,
619 }, {
620 .ident = "CKL6",
621 .matches = {
622 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
623 DMI_MATCH(DMI_BOARD_NAME, "COMe-cKL6"),
624 },
625 .driver_data = (void *)&kempld_platform_data_generic,
626 .callback = kempld_create_platform_device,
627 }, {
628 .ident = "CNTG",
629 .matches = {
630 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
631 DMI_MATCH(DMI_BOARD_NAME, "ETXexpress-PC"),
632 },
633 .driver_data = (void *)&kempld_platform_data_generic,
634 .callback = kempld_create_platform_device,
635 }, {
636 .ident = "CNTG",
637 .matches = {
638 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
639 DMI_MATCH(DMI_BOARD_NAME, "COMe-bPC2"),
640 },
641 .driver_data = (void *)&kempld_platform_data_generic,
642 .callback = kempld_create_platform_device,
643 }, {
644 .ident = "CNTX",
645 .matches = {
646 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
647 DMI_MATCH(DMI_BOARD_NAME, "PXT"),
648 },
649 .driver_data = (void *)&kempld_platform_data_generic,
650 .callback = kempld_create_platform_device,
651 }, {
652 .ident = "CSL6",
653 .matches = {
654 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
655 DMI_MATCH(DMI_BOARD_NAME, "COMe-cSL6"),
656 },
657 .driver_data = (void *)&kempld_platform_data_generic,
658 .callback = kempld_create_platform_device,
659 }, {
660 .ident = "CVV6",
661 .matches = {
662 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
663 DMI_MATCH(DMI_BOARD_NAME, "COMe-cBT"),
664 },
665 .driver_data = (void *)&kempld_platform_data_generic,
666 .callback = kempld_create_platform_device,
667 }, {
668 .ident = "FRI2",
669 .matches = {
670 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
671 DMI_MATCH(DMI_BIOS_VERSION, "FRI2"),
672 },
673 .driver_data = (void *)&kempld_platform_data_generic,
674 .callback = kempld_create_platform_device,
675 }, {
676 .ident = "FRI2",
677 .matches = {
678 DMI_MATCH(DMI_PRODUCT_NAME, "Fish River Island II"),
679 },
680 .driver_data = (void *)&kempld_platform_data_generic,
681 .callback = kempld_create_platform_device,
682 }, {
683 .ident = "MAL1",
684 .matches = {
685 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
686 DMI_MATCH(DMI_BOARD_NAME, "COMe-mAL10"),
687 },
688 .driver_data = (void *)&kempld_platform_data_generic,
689 .callback = kempld_create_platform_device,
690 }, {
691 .ident = "MBR1",
692 .matches = {
693 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
694 DMI_MATCH(DMI_BOARD_NAME, "ETX-OH"),
695 },
696 .driver_data = (void *)&kempld_platform_data_generic,
697 .callback = kempld_create_platform_device,
698 }, {
699 .ident = "MVV1",
700 .matches = {
701 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
702 DMI_MATCH(DMI_BOARD_NAME, "COMe-mBT"),
703 },
704 .driver_data = (void *)&kempld_platform_data_generic,
705 .callback = kempld_create_platform_device,
706 }, {
707 .ident = "NTC1",
708 .matches = {
709 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
710 DMI_MATCH(DMI_BOARD_NAME, "nanoETXexpress-TT"),
711 },
712 .driver_data = (void *)&kempld_platform_data_generic,
713 .callback = kempld_create_platform_device,
714 }, {
715 .ident = "NTC1",
716 .matches = {
717 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
718 DMI_MATCH(DMI_BOARD_NAME, "nETXe-TT"),
719 },
720 .driver_data = (void *)&kempld_platform_data_generic,
721 .callback = kempld_create_platform_device,
722 }, {
723 .ident = "NTC1",
724 .matches = {
725 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
726 DMI_MATCH(DMI_BOARD_NAME, "COMe-mTT"),
727 },
728 .driver_data = (void *)&kempld_platform_data_generic,
729 .callback = kempld_create_platform_device,
730 }, {
731 .ident = "NUP1",
732 .matches = {
733 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
734 DMI_MATCH(DMI_BOARD_NAME, "COMe-mCT"),
735 },
736 .driver_data = (void *)&kempld_platform_data_generic,
737 .callback = kempld_create_platform_device,
738 }, {
739 .ident = "UNP1",
740 .matches = {
741 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
742 DMI_MATCH(DMI_BOARD_NAME, "microETXexpress-DC"),
743 },
744 .driver_data = (void *)&kempld_platform_data_generic,
745 .callback = kempld_create_platform_device,
746 }, {
747 .ident = "UNP1",
748 .matches = {
749 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
750 DMI_MATCH(DMI_BOARD_NAME, "COMe-cDC2"),
751 },
752 .driver_data = (void *)&kempld_platform_data_generic,
753 .callback = kempld_create_platform_device,
754 }, {
755 .ident = "UNTG",
756 .matches = {
757 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
758 DMI_MATCH(DMI_BOARD_NAME, "microETXexpress-PC"),
759 },
760 .driver_data = (void *)&kempld_platform_data_generic,
761 .callback = kempld_create_platform_device,
762 }, {
763 .ident = "UNTG",
764 .matches = {
765 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
766 DMI_MATCH(DMI_BOARD_NAME, "COMe-cPC2"),
767 },
768 .driver_data = (void *)&kempld_platform_data_generic,
769 .callback = kempld_create_platform_device,
770 }, {
771 .ident = "UUP6",
772 .matches = {
773 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
774 DMI_MATCH(DMI_BOARD_NAME, "COMe-cCT6"),
775 },
776 .driver_data = (void *)&kempld_platform_data_generic,
777 .callback = kempld_create_platform_device,
778 },
779 {
780 .ident = "UTH6",
781 .matches = {
782 DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
783 DMI_MATCH(DMI_BOARD_NAME, "COMe-cTH6"),
784 },
785 .driver_data = (void *)&kempld_platform_data_generic,
786 .callback = kempld_create_platform_device,
787 },
788 {}
789};
790MODULE_DEVICE_TABLE(dmi, kempld_dmi_table);
791
792static int __init kempld_init(void)
793{
794 const struct dmi_system_id *id;
795
796 if (force_device_id[0]) {
797 for (id = kempld_dmi_table;
798 id->matches[0].slot != DMI_NONE; id++)
799 if (strstr(id->ident, force_device_id))
800 if (id->callback && !id->callback(id))
801 break;
802 if (id->matches[0].slot == DMI_NONE)
803 return -ENODEV;
804 } else {
805 if (!dmi_check_system(kempld_dmi_table))
806 return -ENODEV;
807 }
808
809 return platform_driver_register(&kempld_driver);
810}
811
812static void __exit kempld_exit(void)
813{
814 if (kempld_pdev)
815 platform_device_unregister(kempld_pdev);
816
817 platform_driver_unregister(&kempld_driver);
818}
819
820module_init(kempld_init);
821module_exit(kempld_exit);
822
823MODULE_DESCRIPTION("KEM PLD Core Driver");
824MODULE_AUTHOR("Michael Brunner <michael.brunner@kontron.com>");
825MODULE_LICENSE("GPL");
826MODULE_ALIAS("platform:kempld-core");