1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
4 */
5 #include <linux/module.h>
6 #include <linux/kernel.h>
7 #include <linux/slab.h>
8 #include <linux/pci.h>
9 #include <linux/gpio/driver.h>
10 #include <linux/interrupt.h>
11 #include <linux/irq.h>
12
13 #define IOH_EDGE_FALLING 0
14 #define IOH_EDGE_RISING BIT(0)
15 #define IOH_LEVEL_L BIT(1)
16 #define IOH_LEVEL_H (BIT(0) | BIT(1))
17 #define IOH_EDGE_BOTH BIT(2)
18 #define IOH_IM_MASK (BIT(0) | BIT(1) | BIT(2))
19
20 #define IOH_IRQ_BASE 0
21
22 struct ioh_reg_comn {
23 u32 ien;
24 u32 istatus;
25 u32 idisp;
26 u32 iclr;
27 u32 imask;
28 u32 imaskclr;
29 u32 po;
30 u32 pi;
31 u32 pm;
32 u32 im_0;
33 u32 im_1;
34 u32 reserved;
35 };
36
37 struct ioh_regs {
38 struct ioh_reg_comn regs[8];
39 u32 reserve1[16];
40 u32 ioh_sel_reg[4];
41 u32 reserve2[11];
42 u32 srst;
43 };
44
45 /**
46 * struct ioh_gpio_reg_data - The register store data.
47 * @ien_reg To store contents of interrupt enable register.
48 * @imask_reg: To store contents of interrupt mask regist
49 * @po_reg: To store contents of PO register.
50 * @pm_reg: To store contents of PM register.
51 * @im0_reg: To store contents of interrupt mode regist0
52 * @im1_reg: To store contents of interrupt mode regist1
53 * @use_sel_reg: To store contents of GPIO_USE_SEL0~3
54 */
55 struct ioh_gpio_reg_data {
56 u32 ien_reg;
57 u32 imask_reg;
58 u32 po_reg;
59 u32 pm_reg;
60 u32 im0_reg;
61 u32 im1_reg;
62 u32 use_sel_reg;
63 };
64
65 /**
66 * struct ioh_gpio - GPIO private data structure.
67 * @base: PCI base address of Memory mapped I/O register.
68 * @reg: Memory mapped IOH GPIO register list.
69 * @dev: Pointer to device structure.
70 * @gpio: Data for GPIO infrastructure.
71 * @ioh_gpio_reg: Memory mapped Register data is saved here
72 * when suspend.
73 * @gpio_use_sel: Save GPIO_USE_SEL1~4 register for PM
74 * @ch: Indicate GPIO channel
75 * @irq_base: Save base of IRQ number for interrupt
76 * @spinlock: Used for register access protection
77 */
78 struct ioh_gpio {
79 void __iomem *base;
80 struct ioh_regs __iomem *reg;
81 struct device *dev;
82 struct gpio_chip gpio;
83 struct ioh_gpio_reg_data ioh_gpio_reg;
84 u32 gpio_use_sel;
85 int ch;
86 int irq_base;
87 spinlock_t spinlock;
88 };
89
90 static const int num_ports[] = {6, 12, 16, 16, 15, 16, 16, 12};
91
ioh_gpio_set(struct gpio_chip * gpio,unsigned nr,int val)92 static void ioh_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
93 {
94 u32 reg_val;
95 struct ioh_gpio *chip = gpiochip_get_data(gpio);
96 unsigned long flags;
97
98 spin_lock_irqsave(&chip->spinlock, flags);
99 reg_val = ioread32(&chip->reg->regs[chip->ch].po);
100 if (val)
101 reg_val |= (1 << nr);
102 else
103 reg_val &= ~(1 << nr);
104
105 iowrite32(reg_val, &chip->reg->regs[chip->ch].po);
106 spin_unlock_irqrestore(&chip->spinlock, flags);
107 }
108
ioh_gpio_get(struct gpio_chip * gpio,unsigned nr)109 static int ioh_gpio_get(struct gpio_chip *gpio, unsigned nr)
110 {
111 struct ioh_gpio *chip = gpiochip_get_data(gpio);
112
113 return !!(ioread32(&chip->reg->regs[chip->ch].pi) & (1 << nr));
114 }
115
ioh_gpio_direction_output(struct gpio_chip * gpio,unsigned nr,int val)116 static int ioh_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
117 int val)
118 {
119 struct ioh_gpio *chip = gpiochip_get_data(gpio);
120 u32 pm;
121 u32 reg_val;
122 unsigned long flags;
123
124 spin_lock_irqsave(&chip->spinlock, flags);
125 pm = ioread32(&chip->reg->regs[chip->ch].pm) &
126 ((1 << num_ports[chip->ch]) - 1);
127 pm |= (1 << nr);
128 iowrite32(pm, &chip->reg->regs[chip->ch].pm);
129
130 reg_val = ioread32(&chip->reg->regs[chip->ch].po);
131 if (val)
132 reg_val |= (1 << nr);
133 else
134 reg_val &= ~(1 << nr);
135 iowrite32(reg_val, &chip->reg->regs[chip->ch].po);
136
137 spin_unlock_irqrestore(&chip->spinlock, flags);
138
139 return 0;
140 }
141
ioh_gpio_direction_input(struct gpio_chip * gpio,unsigned nr)142 static int ioh_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
143 {
144 struct ioh_gpio *chip = gpiochip_get_data(gpio);
145 u32 pm;
146 unsigned long flags;
147
148 spin_lock_irqsave(&chip->spinlock, flags);
149 pm = ioread32(&chip->reg->regs[chip->ch].pm) &
150 ((1 << num_ports[chip->ch]) - 1);
151 pm &= ~(1 << nr);
152 iowrite32(pm, &chip->reg->regs[chip->ch].pm);
153 spin_unlock_irqrestore(&chip->spinlock, flags);
154
155 return 0;
156 }
157
158 #ifdef CONFIG_PM
159 /*
160 * Save register configuration and disable interrupts.
161 */
ioh_gpio_save_reg_conf(struct ioh_gpio * chip)162 static void ioh_gpio_save_reg_conf(struct ioh_gpio *chip)
163 {
164 int i;
165
166 for (i = 0; i < 8; i ++, chip++) {
167 chip->ioh_gpio_reg.po_reg =
168 ioread32(&chip->reg->regs[chip->ch].po);
169 chip->ioh_gpio_reg.pm_reg =
170 ioread32(&chip->reg->regs[chip->ch].pm);
171 chip->ioh_gpio_reg.ien_reg =
172 ioread32(&chip->reg->regs[chip->ch].ien);
173 chip->ioh_gpio_reg.imask_reg =
174 ioread32(&chip->reg->regs[chip->ch].imask);
175 chip->ioh_gpio_reg.im0_reg =
176 ioread32(&chip->reg->regs[chip->ch].im_0);
177 chip->ioh_gpio_reg.im1_reg =
178 ioread32(&chip->reg->regs[chip->ch].im_1);
179 if (i < 4)
180 chip->ioh_gpio_reg.use_sel_reg =
181 ioread32(&chip->reg->ioh_sel_reg[i]);
182 }
183 }
184
185 /*
186 * This function restores the register configuration of the GPIO device.
187 */
ioh_gpio_restore_reg_conf(struct ioh_gpio * chip)188 static void ioh_gpio_restore_reg_conf(struct ioh_gpio *chip)
189 {
190 int i;
191
192 for (i = 0; i < 8; i ++, chip++) {
193 iowrite32(chip->ioh_gpio_reg.po_reg,
194 &chip->reg->regs[chip->ch].po);
195 iowrite32(chip->ioh_gpio_reg.pm_reg,
196 &chip->reg->regs[chip->ch].pm);
197 iowrite32(chip->ioh_gpio_reg.ien_reg,
198 &chip->reg->regs[chip->ch].ien);
199 iowrite32(chip->ioh_gpio_reg.imask_reg,
200 &chip->reg->regs[chip->ch].imask);
201 iowrite32(chip->ioh_gpio_reg.im0_reg,
202 &chip->reg->regs[chip->ch].im_0);
203 iowrite32(chip->ioh_gpio_reg.im1_reg,
204 &chip->reg->regs[chip->ch].im_1);
205 if (i < 4)
206 iowrite32(chip->ioh_gpio_reg.use_sel_reg,
207 &chip->reg->ioh_sel_reg[i]);
208 }
209 }
210 #endif
211
ioh_gpio_to_irq(struct gpio_chip * gpio,unsigned offset)212 static int ioh_gpio_to_irq(struct gpio_chip *gpio, unsigned offset)
213 {
214 struct ioh_gpio *chip = gpiochip_get_data(gpio);
215 return chip->irq_base + offset;
216 }
217
ioh_gpio_setup(struct ioh_gpio * chip,int num_port)218 static void ioh_gpio_setup(struct ioh_gpio *chip, int num_port)
219 {
220 struct gpio_chip *gpio = &chip->gpio;
221
222 gpio->label = dev_name(chip->dev);
223 gpio->owner = THIS_MODULE;
224 gpio->direction_input = ioh_gpio_direction_input;
225 gpio->get = ioh_gpio_get;
226 gpio->direction_output = ioh_gpio_direction_output;
227 gpio->set = ioh_gpio_set;
228 gpio->dbg_show = NULL;
229 gpio->base = -1;
230 gpio->ngpio = num_port;
231 gpio->can_sleep = false;
232 gpio->to_irq = ioh_gpio_to_irq;
233 }
234
ioh_irq_type(struct irq_data * d,unsigned int type)235 static int ioh_irq_type(struct irq_data *d, unsigned int type)
236 {
237 u32 im;
238 void __iomem *im_reg;
239 u32 ien;
240 u32 im_pos;
241 int ch;
242 unsigned long flags;
243 u32 val;
244 int irq = d->irq;
245 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
246 struct ioh_gpio *chip = gc->private;
247
248 ch = irq - chip->irq_base;
249 if (irq <= chip->irq_base + 7) {
250 im_reg = &chip->reg->regs[chip->ch].im_0;
251 im_pos = ch;
252 } else {
253 im_reg = &chip->reg->regs[chip->ch].im_1;
254 im_pos = ch - 8;
255 }
256 dev_dbg(chip->dev, "%s:irq=%d type=%d ch=%d pos=%d type=%d\n",
257 __func__, irq, type, ch, im_pos, type);
258
259 spin_lock_irqsave(&chip->spinlock, flags);
260
261 switch (type) {
262 case IRQ_TYPE_EDGE_RISING:
263 val = IOH_EDGE_RISING;
264 break;
265 case IRQ_TYPE_EDGE_FALLING:
266 val = IOH_EDGE_FALLING;
267 break;
268 case IRQ_TYPE_EDGE_BOTH:
269 val = IOH_EDGE_BOTH;
270 break;
271 case IRQ_TYPE_LEVEL_HIGH:
272 val = IOH_LEVEL_H;
273 break;
274 case IRQ_TYPE_LEVEL_LOW:
275 val = IOH_LEVEL_L;
276 break;
277 case IRQ_TYPE_PROBE:
278 goto end;
279 default:
280 dev_warn(chip->dev, "%s: unknown type(%dd)",
281 __func__, type);
282 goto end;
283 }
284
285 /* Set interrupt mode */
286 im = ioread32(im_reg) & ~(IOH_IM_MASK << (im_pos * 4));
287 iowrite32(im | (val << (im_pos * 4)), im_reg);
288
289 /* iclr */
290 iowrite32(BIT(ch), &chip->reg->regs[chip->ch].iclr);
291
292 /* IMASKCLR */
293 iowrite32(BIT(ch), &chip->reg->regs[chip->ch].imaskclr);
294
295 /* Enable interrupt */
296 ien = ioread32(&chip->reg->regs[chip->ch].ien);
297 iowrite32(ien | BIT(ch), &chip->reg->regs[chip->ch].ien);
298 end:
299 spin_unlock_irqrestore(&chip->spinlock, flags);
300
301 return 0;
302 }
303
ioh_irq_unmask(struct irq_data * d)304 static void ioh_irq_unmask(struct irq_data *d)
305 {
306 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
307 struct ioh_gpio *chip = gc->private;
308
309 iowrite32(1 << (d->irq - chip->irq_base),
310 &chip->reg->regs[chip->ch].imaskclr);
311 }
312
ioh_irq_mask(struct irq_data * d)313 static void ioh_irq_mask(struct irq_data *d)
314 {
315 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
316 struct ioh_gpio *chip = gc->private;
317
318 iowrite32(1 << (d->irq - chip->irq_base),
319 &chip->reg->regs[chip->ch].imask);
320 }
321
ioh_irq_disable(struct irq_data * d)322 static void ioh_irq_disable(struct irq_data *d)
323 {
324 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
325 struct ioh_gpio *chip = gc->private;
326 unsigned long flags;
327 u32 ien;
328
329 spin_lock_irqsave(&chip->spinlock, flags);
330 ien = ioread32(&chip->reg->regs[chip->ch].ien);
331 ien &= ~(1 << (d->irq - chip->irq_base));
332 iowrite32(ien, &chip->reg->regs[chip->ch].ien);
333 spin_unlock_irqrestore(&chip->spinlock, flags);
334 }
335
ioh_irq_enable(struct irq_data * d)336 static void ioh_irq_enable(struct irq_data *d)
337 {
338 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
339 struct ioh_gpio *chip = gc->private;
340 unsigned long flags;
341 u32 ien;
342
343 spin_lock_irqsave(&chip->spinlock, flags);
344 ien = ioread32(&chip->reg->regs[chip->ch].ien);
345 ien |= 1 << (d->irq - chip->irq_base);
346 iowrite32(ien, &chip->reg->regs[chip->ch].ien);
347 spin_unlock_irqrestore(&chip->spinlock, flags);
348 }
349
ioh_gpio_handler(int irq,void * dev_id)350 static irqreturn_t ioh_gpio_handler(int irq, void *dev_id)
351 {
352 struct ioh_gpio *chip = dev_id;
353 u32 reg_val;
354 int i, j;
355 int ret = IRQ_NONE;
356
357 for (i = 0; i < 8; i++, chip++) {
358 reg_val = ioread32(&chip->reg->regs[i].istatus);
359 for (j = 0; j < num_ports[i]; j++) {
360 if (reg_val & BIT(j)) {
361 dev_dbg(chip->dev,
362 "%s:[%d]:irq=%d status=0x%x\n",
363 __func__, j, irq, reg_val);
364 iowrite32(BIT(j),
365 &chip->reg->regs[chip->ch].iclr);
366 generic_handle_irq(chip->irq_base + j);
367 ret = IRQ_HANDLED;
368 }
369 }
370 }
371 return ret;
372 }
373
ioh_gpio_alloc_generic_chip(struct ioh_gpio * chip,unsigned int irq_start,unsigned int num)374 static int ioh_gpio_alloc_generic_chip(struct ioh_gpio *chip,
375 unsigned int irq_start,
376 unsigned int num)
377 {
378 struct irq_chip_generic *gc;
379 struct irq_chip_type *ct;
380 int rv;
381
382 gc = devm_irq_alloc_generic_chip(chip->dev, "ioh_gpio", 1, irq_start,
383 chip->base, handle_simple_irq);
384 if (!gc)
385 return -ENOMEM;
386
387 gc->private = chip;
388 ct = gc->chip_types;
389
390 ct->chip.irq_mask = ioh_irq_mask;
391 ct->chip.irq_unmask = ioh_irq_unmask;
392 ct->chip.irq_set_type = ioh_irq_type;
393 ct->chip.irq_disable = ioh_irq_disable;
394 ct->chip.irq_enable = ioh_irq_enable;
395
396 rv = devm_irq_setup_generic_chip(chip->dev, gc, IRQ_MSK(num),
397 IRQ_GC_INIT_MASK_CACHE,
398 IRQ_NOREQUEST | IRQ_NOPROBE, 0);
399
400 return rv;
401 }
402
ioh_gpio_probe(struct pci_dev * pdev,const struct pci_device_id * id)403 static int ioh_gpio_probe(struct pci_dev *pdev,
404 const struct pci_device_id *id)
405 {
406 int ret;
407 int i, j;
408 struct ioh_gpio *chip;
409 void __iomem *base;
410 void *chip_save;
411 int irq_base;
412
413 ret = pci_enable_device(pdev);
414 if (ret) {
415 dev_err(&pdev->dev, "%s : pci_enable_device failed", __func__);
416 goto err_pci_enable;
417 }
418
419 ret = pci_request_regions(pdev, KBUILD_MODNAME);
420 if (ret) {
421 dev_err(&pdev->dev, "pci_request_regions failed-%d", ret);
422 goto err_request_regions;
423 }
424
425 base = pci_iomap(pdev, 1, 0);
426 if (!base) {
427 dev_err(&pdev->dev, "%s : pci_iomap failed", __func__);
428 ret = -ENOMEM;
429 goto err_iomap;
430 }
431
432 chip_save = kcalloc(8, sizeof(*chip), GFP_KERNEL);
433 if (chip_save == NULL) {
434 ret = -ENOMEM;
435 goto err_kzalloc;
436 }
437
438 chip = chip_save;
439 for (i = 0; i < 8; i++, chip++) {
440 chip->dev = &pdev->dev;
441 chip->base = base;
442 chip->reg = chip->base;
443 chip->ch = i;
444 spin_lock_init(&chip->spinlock);
445 ioh_gpio_setup(chip, num_ports[i]);
446 ret = gpiochip_add_data(&chip->gpio, chip);
447 if (ret) {
448 dev_err(&pdev->dev, "IOH gpio: Failed to register GPIO\n");
449 goto err_gpiochip_add;
450 }
451 }
452
453 chip = chip_save;
454 for (j = 0; j < 8; j++, chip++) {
455 irq_base = devm_irq_alloc_descs(&pdev->dev, -1, IOH_IRQ_BASE,
456 num_ports[j], NUMA_NO_NODE);
457 if (irq_base < 0) {
458 dev_warn(&pdev->dev,
459 "ml_ioh_gpio: Failed to get IRQ base num\n");
460 ret = irq_base;
461 goto err_gpiochip_add;
462 }
463 chip->irq_base = irq_base;
464
465 ret = ioh_gpio_alloc_generic_chip(chip,
466 irq_base, num_ports[j]);
467 if (ret)
468 goto err_gpiochip_add;
469 }
470
471 chip = chip_save;
472 ret = devm_request_irq(&pdev->dev, pdev->irq, ioh_gpio_handler,
473 IRQF_SHARED, KBUILD_MODNAME, chip);
474 if (ret != 0) {
475 dev_err(&pdev->dev,
476 "%s request_irq failed\n", __func__);
477 goto err_gpiochip_add;
478 }
479
480 pci_set_drvdata(pdev, chip);
481
482 return 0;
483
484 err_gpiochip_add:
485 chip = chip_save;
486 while (--i >= 0) {
487 gpiochip_remove(&chip->gpio);
488 chip++;
489 }
490 kfree(chip_save);
491
492 err_kzalloc:
493 pci_iounmap(pdev, base);
494
495 err_iomap:
496 pci_release_regions(pdev);
497
498 err_request_regions:
499 pci_disable_device(pdev);
500
501 err_pci_enable:
502
503 dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
504 return ret;
505 }
506
ioh_gpio_remove(struct pci_dev * pdev)507 static void ioh_gpio_remove(struct pci_dev *pdev)
508 {
509 int i;
510 struct ioh_gpio *chip = pci_get_drvdata(pdev);
511 void *chip_save;
512
513 chip_save = chip;
514
515 for (i = 0; i < 8; i++, chip++)
516 gpiochip_remove(&chip->gpio);
517
518 chip = chip_save;
519 pci_iounmap(pdev, chip->base);
520 pci_release_regions(pdev);
521 pci_disable_device(pdev);
522 kfree(chip);
523 }
524
525 #ifdef CONFIG_PM
ioh_gpio_suspend(struct pci_dev * pdev,pm_message_t state)526 static int ioh_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
527 {
528 s32 ret;
529 struct ioh_gpio *chip = pci_get_drvdata(pdev);
530 unsigned long flags;
531
532 spin_lock_irqsave(&chip->spinlock, flags);
533 ioh_gpio_save_reg_conf(chip);
534 spin_unlock_irqrestore(&chip->spinlock, flags);
535
536 ret = pci_save_state(pdev);
537 if (ret) {
538 dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
539 return ret;
540 }
541 pci_disable_device(pdev);
542 pci_set_power_state(pdev, PCI_D0);
543 ret = pci_enable_wake(pdev, PCI_D0, 1);
544 if (ret)
545 dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);
546
547 return 0;
548 }
549
ioh_gpio_resume(struct pci_dev * pdev)550 static int ioh_gpio_resume(struct pci_dev *pdev)
551 {
552 s32 ret;
553 struct ioh_gpio *chip = pci_get_drvdata(pdev);
554 unsigned long flags;
555
556 ret = pci_enable_wake(pdev, PCI_D0, 0);
557
558 pci_set_power_state(pdev, PCI_D0);
559 ret = pci_enable_device(pdev);
560 if (ret) {
561 dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
562 return ret;
563 }
564 pci_restore_state(pdev);
565
566 spin_lock_irqsave(&chip->spinlock, flags);
567 iowrite32(0x01, &chip->reg->srst);
568 iowrite32(0x00, &chip->reg->srst);
569 ioh_gpio_restore_reg_conf(chip);
570 spin_unlock_irqrestore(&chip->spinlock, flags);
571
572 return 0;
573 }
574 #else
575 #define ioh_gpio_suspend NULL
576 #define ioh_gpio_resume NULL
577 #endif
578
579 static const struct pci_device_id ioh_gpio_pcidev_id[] = {
580 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x802E) },
581 { 0, }
582 };
583 MODULE_DEVICE_TABLE(pci, ioh_gpio_pcidev_id);
584
585 static struct pci_driver ioh_gpio_driver = {
586 .name = "ml_ioh_gpio",
587 .id_table = ioh_gpio_pcidev_id,
588 .probe = ioh_gpio_probe,
589 .remove = ioh_gpio_remove,
590 .suspend = ioh_gpio_suspend,
591 .resume = ioh_gpio_resume
592 };
593
594 module_pci_driver(ioh_gpio_driver);
595
596 MODULE_DESCRIPTION("OKI SEMICONDUCTOR ML-IOH series GPIO Driver");
597 MODULE_LICENSE("GPL");
598
