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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2016, 2017 Cavium Inc.
7 */
8
9#include <linux/bitops.h>
10#include <linux/gpio/driver.h>
11#include <linux/interrupt.h>
12#include <linux/io.h>
13#include <linux/irq.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/pci.h>
17#include <linux/spinlock.h>
18
19#define GPIO_RX_DAT 0x0
20#define GPIO_TX_SET 0x8
21#define GPIO_TX_CLR 0x10
22#define GPIO_CONST 0x90
23#define GPIO_CONST_GPIOS_MASK 0xff
24#define GPIO_BIT_CFG 0x400
25#define GPIO_BIT_CFG_TX_OE BIT(0)
26#define GPIO_BIT_CFG_PIN_XOR BIT(1)
27#define GPIO_BIT_CFG_INT_EN BIT(2)
28#define GPIO_BIT_CFG_INT_TYPE BIT(3)
29#define GPIO_BIT_CFG_FIL_MASK GENMASK(11, 4)
30#define GPIO_BIT_CFG_FIL_CNT_SHIFT 4
31#define GPIO_BIT_CFG_FIL_SEL_SHIFT 8
32#define GPIO_BIT_CFG_TX_OD BIT(12)
33#define GPIO_BIT_CFG_PIN_SEL_MASK GENMASK(25, 16)
34#define GPIO_INTR 0x800
35#define GPIO_INTR_INTR BIT(0)
36#define GPIO_INTR_INTR_W1S BIT(1)
37#define GPIO_INTR_ENA_W1C BIT(2)
38#define GPIO_INTR_ENA_W1S BIT(3)
39#define GPIO_2ND_BANK 0x1400
40
41#define GLITCH_FILTER_400NS ((4u << GPIO_BIT_CFG_FIL_SEL_SHIFT) | \
42 (9u << GPIO_BIT_CFG_FIL_CNT_SHIFT))
43
44struct thunderx_gpio;
45
46struct thunderx_line {
47 struct thunderx_gpio *txgpio;
48 unsigned int line;
49 unsigned int fil_bits;
50};
51
52struct thunderx_gpio {
53 struct gpio_chip chip;
54 u8 __iomem *register_base;
55 struct msix_entry *msix_entries; /* per line MSI-X */
56 struct thunderx_line *line_entries; /* per line irq info */
57 raw_spinlock_t lock;
58 unsigned long invert_mask[2];
59 unsigned long od_mask[2];
60 int base_msi;
61};
62
63static unsigned int bit_cfg_reg(unsigned int line)
64{
65 return 8 * line + GPIO_BIT_CFG;
66}
67
68static unsigned int intr_reg(unsigned int line)
69{
70 return 8 * line + GPIO_INTR;
71}
72
73static bool thunderx_gpio_is_gpio_nowarn(struct thunderx_gpio *txgpio,
74 unsigned int line)
75{
76 u64 bit_cfg = readq(txgpio->register_base + bit_cfg_reg(line));
77
78 return (bit_cfg & GPIO_BIT_CFG_PIN_SEL_MASK) == 0;
79}
80
81/*
82 * Check (and WARN) that the pin is available for GPIO. We will not
83 * allow modification of the state of non-GPIO pins from this driver.
84 */
85static bool thunderx_gpio_is_gpio(struct thunderx_gpio *txgpio,
86 unsigned int line)
87{
88 bool rv = thunderx_gpio_is_gpio_nowarn(txgpio, line);
89
90 WARN_RATELIMIT(!rv, "Pin %d not available for GPIO\n", line);
91
92 return rv;
93}
94
95static int thunderx_gpio_request(struct gpio_chip *chip, unsigned int line)
96{
97 struct thunderx_gpio *txgpio = gpiochip_get_data(chip);
98
99 return thunderx_gpio_is_gpio(txgpio, line) ? 0 : -EIO;
100}
101
102static int thunderx_gpio_dir_in(struct gpio_chip *chip, unsigned int line)
103{
104 struct thunderx_gpio *txgpio = gpiochip_get_data(chip);
105
106 if (!thunderx_gpio_is_gpio(txgpio, line))
107 return -EIO;
108
109 raw_spin_lock(&txgpio->lock);
110 clear_bit(line, txgpio->invert_mask);
111 clear_bit(line, txgpio->od_mask);
112 writeq(txgpio->line_entries[line].fil_bits,
113 txgpio->register_base + bit_cfg_reg(line));
114 raw_spin_unlock(&txgpio->lock);
115 return 0;
116}
117
118static void thunderx_gpio_set(struct gpio_chip *chip, unsigned int line,
119 int value)
120{
121 struct thunderx_gpio *txgpio = gpiochip_get_data(chip);
122 int bank = line / 64;
123 int bank_bit = line % 64;
124
125 void __iomem *reg = txgpio->register_base +
126 (bank * GPIO_2ND_BANK) + (value ? GPIO_TX_SET : GPIO_TX_CLR);
127
128 writeq(BIT_ULL(bank_bit), reg);
129}
130
131static int thunderx_gpio_dir_out(struct gpio_chip *chip, unsigned int line,
132 int value)
133{
134 struct thunderx_gpio *txgpio = gpiochip_get_data(chip);
135 u64 bit_cfg = txgpio->line_entries[line].fil_bits | GPIO_BIT_CFG_TX_OE;
136
137 if (!thunderx_gpio_is_gpio(txgpio, line))
138 return -EIO;
139
140 raw_spin_lock(&txgpio->lock);
141
142 thunderx_gpio_set(chip, line, value);
143
144 if (test_bit(line, txgpio->invert_mask))
145 bit_cfg |= GPIO_BIT_CFG_PIN_XOR;
146
147 if (test_bit(line, txgpio->od_mask))
148 bit_cfg |= GPIO_BIT_CFG_TX_OD;
149
150 writeq(bit_cfg, txgpio->register_base + bit_cfg_reg(line));
151
152 raw_spin_unlock(&txgpio->lock);
153 return 0;
154}
155
156static int thunderx_gpio_get_direction(struct gpio_chip *chip, unsigned int line)
157{
158 struct thunderx_gpio *txgpio = gpiochip_get_data(chip);
159 u64 bit_cfg;
160
161 if (!thunderx_gpio_is_gpio_nowarn(txgpio, line))
162 /*
163 * Say it is input for now to avoid WARNing on
164 * gpiochip_add_data(). We will WARN if someone
165 * requests it or tries to use it.
166 */
167 return 1;
168
169 bit_cfg = readq(txgpio->register_base + bit_cfg_reg(line));
170
171 if (bit_cfg & GPIO_BIT_CFG_TX_OE)
172 return GPIO_LINE_DIRECTION_OUT;
173
174 return GPIO_LINE_DIRECTION_IN;
175}
176
177static int thunderx_gpio_set_config(struct gpio_chip *chip,
178 unsigned int line,
179 unsigned long cfg)
180{
181 bool orig_invert, orig_od, orig_dat, new_invert, new_od;
182 u32 arg, sel;
183 u64 bit_cfg;
184 int bank = line / 64;
185 int bank_bit = line % 64;
186 int ret = -ENOTSUPP;
187 struct thunderx_gpio *txgpio = gpiochip_get_data(chip);
188 void __iomem *reg = txgpio->register_base + (bank * GPIO_2ND_BANK) + GPIO_TX_SET;
189
190 if (!thunderx_gpio_is_gpio(txgpio, line))
191 return -EIO;
192
193 raw_spin_lock(&txgpio->lock);
194 orig_invert = test_bit(line, txgpio->invert_mask);
195 new_invert = orig_invert;
196 orig_od = test_bit(line, txgpio->od_mask);
197 new_od = orig_od;
198 orig_dat = ((readq(reg) >> bank_bit) & 1) ^ orig_invert;
199 bit_cfg = readq(txgpio->register_base + bit_cfg_reg(line));
200 switch (pinconf_to_config_param(cfg)) {
201 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
202 /*
203 * Weird, setting open-drain mode causes signal
204 * inversion. Note this so we can compensate in the
205 * dir_out function.
206 */
207 set_bit(line, txgpio->invert_mask);
208 new_invert = true;
209 set_bit(line, txgpio->od_mask);
210 new_od = true;
211 ret = 0;
212 break;
213 case PIN_CONFIG_DRIVE_PUSH_PULL:
214 clear_bit(line, txgpio->invert_mask);
215 new_invert = false;
216 clear_bit(line, txgpio->od_mask);
217 new_od = false;
218 ret = 0;
219 break;
220 case PIN_CONFIG_INPUT_DEBOUNCE:
221 arg = pinconf_to_config_argument(cfg);
222 if (arg > 1228) { /* 15 * 2^15 * 2.5nS maximum */
223 ret = -EINVAL;
224 break;
225 }
226 arg *= 400; /* scale to 2.5nS clocks. */
227 sel = 0;
228 while (arg > 15) {
229 sel++;
230 arg++; /* always round up */
231 arg >>= 1;
232 }
233 txgpio->line_entries[line].fil_bits =
234 (sel << GPIO_BIT_CFG_FIL_SEL_SHIFT) |
235 (arg << GPIO_BIT_CFG_FIL_CNT_SHIFT);
236 bit_cfg &= ~GPIO_BIT_CFG_FIL_MASK;
237 bit_cfg |= txgpio->line_entries[line].fil_bits;
238 writeq(bit_cfg, txgpio->register_base + bit_cfg_reg(line));
239 ret = 0;
240 break;
241 default:
242 break;
243 }
244 raw_spin_unlock(&txgpio->lock);
245
246 /*
247 * If currently output and OPEN_DRAIN changed, install the new
248 * settings
249 */
250 if ((new_invert != orig_invert || new_od != orig_od) &&
251 (bit_cfg & GPIO_BIT_CFG_TX_OE))
252 ret = thunderx_gpio_dir_out(chip, line, orig_dat ^ new_invert);
253
254 return ret;
255}
256
257static int thunderx_gpio_get(struct gpio_chip *chip, unsigned int line)
258{
259 struct thunderx_gpio *txgpio = gpiochip_get_data(chip);
260 int bank = line / 64;
261 int bank_bit = line % 64;
262 u64 read_bits = readq(txgpio->register_base + (bank * GPIO_2ND_BANK) + GPIO_RX_DAT);
263 u64 masked_bits = read_bits & BIT_ULL(bank_bit);
264
265 if (test_bit(line, txgpio->invert_mask))
266 return masked_bits == 0;
267 else
268 return masked_bits != 0;
269}
270
271static void thunderx_gpio_set_multiple(struct gpio_chip *chip,
272 unsigned long *mask,
273 unsigned long *bits)
274{
275 int bank;
276 u64 set_bits, clear_bits;
277 struct thunderx_gpio *txgpio = gpiochip_get_data(chip);
278
279 for (bank = 0; bank <= chip->ngpio / 64; bank++) {
280 set_bits = bits[bank] & mask[bank];
281 clear_bits = ~bits[bank] & mask[bank];
282 writeq(set_bits, txgpio->register_base + (bank * GPIO_2ND_BANK) + GPIO_TX_SET);
283 writeq(clear_bits, txgpio->register_base + (bank * GPIO_2ND_BANK) + GPIO_TX_CLR);
284 }
285}
286
287static void thunderx_gpio_irq_ack(struct irq_data *d)
288{
289 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
290 struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
291
292 writeq(GPIO_INTR_INTR,
293 txgpio->register_base + intr_reg(irqd_to_hwirq(d)));
294}
295
296static void thunderx_gpio_irq_mask(struct irq_data *d)
297{
298 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
299 struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
300
301 writeq(GPIO_INTR_ENA_W1C,
302 txgpio->register_base + intr_reg(irqd_to_hwirq(d)));
303}
304
305static void thunderx_gpio_irq_mask_ack(struct irq_data *d)
306{
307 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
308 struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
309
310 writeq(GPIO_INTR_ENA_W1C | GPIO_INTR_INTR,
311 txgpio->register_base + intr_reg(irqd_to_hwirq(d)));
312}
313
314static void thunderx_gpio_irq_unmask(struct irq_data *d)
315{
316 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
317 struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
318
319 writeq(GPIO_INTR_ENA_W1S,
320 txgpio->register_base + intr_reg(irqd_to_hwirq(d)));
321}
322
323static int thunderx_gpio_irq_set_type(struct irq_data *d,
324 unsigned int flow_type)
325{
326 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
327 struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
328 struct thunderx_line *txline =
329 &txgpio->line_entries[irqd_to_hwirq(d)];
330 u64 bit_cfg;
331
332 irqd_set_trigger_type(d, flow_type);
333
334 bit_cfg = txline->fil_bits | GPIO_BIT_CFG_INT_EN;
335
336 if (flow_type & IRQ_TYPE_EDGE_BOTH) {
337 irq_set_handler_locked(d, handle_fasteoi_ack_irq);
338 bit_cfg |= GPIO_BIT_CFG_INT_TYPE;
339 } else {
340 irq_set_handler_locked(d, handle_fasteoi_mask_irq);
341 }
342
343 raw_spin_lock(&txgpio->lock);
344 if (flow_type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)) {
345 bit_cfg |= GPIO_BIT_CFG_PIN_XOR;
346 set_bit(txline->line, txgpio->invert_mask);
347 } else {
348 clear_bit(txline->line, txgpio->invert_mask);
349 }
350 clear_bit(txline->line, txgpio->od_mask);
351 writeq(bit_cfg, txgpio->register_base + bit_cfg_reg(txline->line));
352 raw_spin_unlock(&txgpio->lock);
353
354 return IRQ_SET_MASK_OK;
355}
356
357static void thunderx_gpio_irq_enable(struct irq_data *data)
358{
359 irq_chip_enable_parent(data);
360 thunderx_gpio_irq_unmask(data);
361}
362
363static void thunderx_gpio_irq_disable(struct irq_data *data)
364{
365 thunderx_gpio_irq_mask(data);
366 irq_chip_disable_parent(data);
367}
368
369/*
370 * Interrupts are chained from underlying MSI-X vectors. We have
371 * these irq_chip functions to be able to handle level triggering
372 * semantics and other acknowledgment tasks associated with the GPIO
373 * mechanism.
374 */
375static struct irq_chip thunderx_gpio_irq_chip = {
376 .name = "GPIO",
377 .irq_enable = thunderx_gpio_irq_enable,
378 .irq_disable = thunderx_gpio_irq_disable,
379 .irq_ack = thunderx_gpio_irq_ack,
380 .irq_mask = thunderx_gpio_irq_mask,
381 .irq_mask_ack = thunderx_gpio_irq_mask_ack,
382 .irq_unmask = thunderx_gpio_irq_unmask,
383 .irq_eoi = irq_chip_eoi_parent,
384 .irq_set_affinity = irq_chip_set_affinity_parent,
385 .irq_set_type = thunderx_gpio_irq_set_type,
386
387 .flags = IRQCHIP_SET_TYPE_MASKED
388};
389
390static int thunderx_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
391 unsigned int child,
392 unsigned int child_type,
393 unsigned int *parent,
394 unsigned int *parent_type)
395{
396 struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
397 struct irq_data *irqd;
398 unsigned int irq;
399
400 irq = txgpio->msix_entries[child].vector;
401 irqd = irq_domain_get_irq_data(gc->irq.parent_domain, irq);
402 if (!irqd)
403 return -EINVAL;
404 *parent = irqd_to_hwirq(irqd);
405 *parent_type = IRQ_TYPE_LEVEL_HIGH;
406 return 0;
407}
408
409static int thunderx_gpio_populate_parent_alloc_info(struct gpio_chip *chip,
410 union gpio_irq_fwspec *gfwspec,
411 unsigned int parent_hwirq,
412 unsigned int parent_type)
413{
414 msi_alloc_info_t *info = &gfwspec->msiinfo;
415
416 info->hwirq = parent_hwirq;
417 return 0;
418}
419
420static int thunderx_gpio_probe(struct pci_dev *pdev,
421 const struct pci_device_id *id)
422{
423 void __iomem * const *tbl;
424 struct device *dev = &pdev->dev;
425 struct thunderx_gpio *txgpio;
426 struct gpio_chip *chip;
427 struct gpio_irq_chip *girq;
428 int ngpio, i;
429 int err = 0;
430
431 txgpio = devm_kzalloc(dev, sizeof(*txgpio), GFP_KERNEL);
432 if (!txgpio)
433 return -ENOMEM;
434
435 raw_spin_lock_init(&txgpio->lock);
436 chip = &txgpio->chip;
437
438 pci_set_drvdata(pdev, txgpio);
439
440 err = pcim_enable_device(pdev);
441 if (err) {
442 dev_err(dev, "Failed to enable PCI device: err %d\n", err);
443 goto out;
444 }
445
446 err = pcim_iomap_regions(pdev, 1 << 0, KBUILD_MODNAME);
447 if (err) {
448 dev_err(dev, "Failed to iomap PCI device: err %d\n", err);
449 goto out;
450 }
451
452 tbl = pcim_iomap_table(pdev);
453 txgpio->register_base = tbl[0];
454 if (!txgpio->register_base) {
455 dev_err(dev, "Cannot map PCI resource\n");
456 err = -ENOMEM;
457 goto out;
458 }
459
460 if (pdev->subsystem_device == 0xa10a) {
461 /* CN88XX has no GPIO_CONST register*/
462 ngpio = 50;
463 txgpio->base_msi = 48;
464 } else {
465 u64 c = readq(txgpio->register_base + GPIO_CONST);
466
467 ngpio = c & GPIO_CONST_GPIOS_MASK;
468 txgpio->base_msi = (c >> 8) & 0xff;
469 }
470
471 txgpio->msix_entries = devm_kcalloc(dev,
472 ngpio, sizeof(struct msix_entry),
473 GFP_KERNEL);
474 if (!txgpio->msix_entries) {
475 err = -ENOMEM;
476 goto out;
477 }
478
479 txgpio->line_entries = devm_kcalloc(dev,
480 ngpio,
481 sizeof(struct thunderx_line),
482 GFP_KERNEL);
483 if (!txgpio->line_entries) {
484 err = -ENOMEM;
485 goto out;
486 }
487
488 for (i = 0; i < ngpio; i++) {
489 u64 bit_cfg = readq(txgpio->register_base + bit_cfg_reg(i));
490
491 txgpio->msix_entries[i].entry = txgpio->base_msi + (2 * i);
492 txgpio->line_entries[i].line = i;
493 txgpio->line_entries[i].txgpio = txgpio;
494 /*
495 * If something has already programmed the pin, use
496 * the existing glitch filter settings, otherwise go
497 * to 400nS.
498 */
499 txgpio->line_entries[i].fil_bits = bit_cfg ?
500 (bit_cfg & GPIO_BIT_CFG_FIL_MASK) : GLITCH_FILTER_400NS;
501
502 if ((bit_cfg & GPIO_BIT_CFG_TX_OE) && (bit_cfg & GPIO_BIT_CFG_TX_OD))
503 set_bit(i, txgpio->od_mask);
504 if (bit_cfg & GPIO_BIT_CFG_PIN_XOR)
505 set_bit(i, txgpio->invert_mask);
506 }
507
508
509 /* Enable all MSI-X for interrupts on all possible lines. */
510 err = pci_enable_msix_range(pdev, txgpio->msix_entries, ngpio, ngpio);
511 if (err < 0)
512 goto out;
513
514 chip->label = KBUILD_MODNAME;
515 chip->parent = dev;
516 chip->owner = THIS_MODULE;
517 chip->request = thunderx_gpio_request;
518 chip->base = -1; /* System allocated */
519 chip->can_sleep = false;
520 chip->ngpio = ngpio;
521 chip->get_direction = thunderx_gpio_get_direction;
522 chip->direction_input = thunderx_gpio_dir_in;
523 chip->get = thunderx_gpio_get;
524 chip->direction_output = thunderx_gpio_dir_out;
525 chip->set = thunderx_gpio_set;
526 chip->set_multiple = thunderx_gpio_set_multiple;
527 chip->set_config = thunderx_gpio_set_config;
528 girq = &chip->irq;
529 girq->chip = &thunderx_gpio_irq_chip;
530 girq->fwnode = of_node_to_fwnode(dev->of_node);
531 girq->parent_domain =
532 irq_get_irq_data(txgpio->msix_entries[0].vector)->domain;
533 girq->child_to_parent_hwirq = thunderx_gpio_child_to_parent_hwirq;
534 girq->populate_parent_alloc_arg = thunderx_gpio_populate_parent_alloc_info;
535 girq->handler = handle_bad_irq;
536 girq->default_type = IRQ_TYPE_NONE;
537
538 err = devm_gpiochip_add_data(dev, chip, txgpio);
539 if (err)
540 goto out;
541
542 /* Push on irq_data and the domain for each line. */
543 for (i = 0; i < ngpio; i++) {
544 struct irq_fwspec fwspec;
545
546 fwspec.fwnode = of_node_to_fwnode(dev->of_node);
547 fwspec.param_count = 2;
548 fwspec.param[0] = i;
549 fwspec.param[1] = IRQ_TYPE_NONE;
550 err = irq_domain_push_irq(girq->domain,
551 txgpio->msix_entries[i].vector,
552 &fwspec);
553 if (err < 0)
554 dev_err(dev, "irq_domain_push_irq: %d\n", err);
555 }
556
557 dev_info(dev, "ThunderX GPIO: %d lines with base %d.\n",
558 ngpio, chip->base);
559 return 0;
560out:
561 pci_set_drvdata(pdev, NULL);
562 return err;
563}
564
565static void thunderx_gpio_remove(struct pci_dev *pdev)
566{
567 int i;
568 struct thunderx_gpio *txgpio = pci_get_drvdata(pdev);
569
570 for (i = 0; i < txgpio->chip.ngpio; i++)
571 irq_domain_pop_irq(txgpio->chip.irq.domain,
572 txgpio->msix_entries[i].vector);
573
574 irq_domain_remove(txgpio->chip.irq.domain);
575
576 pci_set_drvdata(pdev, NULL);
577}
578
579static const struct pci_device_id thunderx_gpio_id_table[] = {
580 { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xA00A) },
581 { 0, } /* end of table */
582};
583
584MODULE_DEVICE_TABLE(pci, thunderx_gpio_id_table);
585
586static struct pci_driver thunderx_gpio_driver = {
587 .name = KBUILD_MODNAME,
588 .id_table = thunderx_gpio_id_table,
589 .probe = thunderx_gpio_probe,
590 .remove = thunderx_gpio_remove,
591};
592
593module_pci_driver(thunderx_gpio_driver);
594
595MODULE_DESCRIPTION("Cavium Inc. ThunderX/OCTEON-TX GPIO Driver");
596MODULE_LICENSE("GPL");