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17#include <linux/module.h>
18#include <linux/kernel.h>
19#include <linux/slab.h>
20#include <linux/pci.h>
21#include <linux/gpio.h>
22#include <linux/interrupt.h>
23#include <linux/irq.h>
24
25#define IOH_EDGE_FALLING 0
26#define IOH_EDGE_RISING BIT(0)
27#define IOH_LEVEL_L BIT(1)
28#define IOH_LEVEL_H (BIT(0) | BIT(1))
29#define IOH_EDGE_BOTH BIT(2)
30#define IOH_IM_MASK (BIT(0) | BIT(1) | BIT(2))
31
32#define IOH_IRQ_BASE 0
33
34#define PCI_VENDOR_ID_ROHM 0x10DB
35
36struct ioh_reg_comn {
37 u32 ien;
38 u32 istatus;
39 u32 idisp;
40 u32 iclr;
41 u32 imask;
42 u32 imaskclr;
43 u32 po;
44 u32 pi;
45 u32 pm;
46 u32 im_0;
47 u32 im_1;
48 u32 reserved;
49};
50
51struct ioh_regs {
52 struct ioh_reg_comn regs[8];
53 u32 reserve1[16];
54 u32 ioh_sel_reg[4];
55 u32 reserve2[11];
56 u32 srst;
57};
58
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68
69struct ioh_gpio_reg_data {
70 u32 ien_reg;
71 u32 imask_reg;
72 u32 po_reg;
73 u32 pm_reg;
74 u32 im0_reg;
75 u32 im1_reg;
76 u32 use_sel_reg;
77};
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92
93struct ioh_gpio {
94 void __iomem *base;
95 struct ioh_regs __iomem *reg;
96 struct device *dev;
97 struct gpio_chip gpio;
98 struct ioh_gpio_reg_data ioh_gpio_reg;
99 u32 gpio_use_sel;
100 struct mutex lock;
101 int ch;
102 int irq_base;
103 spinlock_t spinlock;
104};
105
106static const int num_ports[] = {6, 12, 16, 16, 15, 16, 16, 12};
107
108static void ioh_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
109{
110 u32 reg_val;
111 struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
112
113 mutex_lock(&chip->lock);
114 reg_val = ioread32(&chip->reg->regs[chip->ch].po);
115 if (val)
116 reg_val |= (1 << nr);
117 else
118 reg_val &= ~(1 << nr);
119
120 iowrite32(reg_val, &chip->reg->regs[chip->ch].po);
121 mutex_unlock(&chip->lock);
122}
123
124static int ioh_gpio_get(struct gpio_chip *gpio, unsigned nr)
125{
126 struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
127
128 return ioread32(&chip->reg->regs[chip->ch].pi) & (1 << nr);
129}
130
131static int ioh_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
132 int val)
133{
134 struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
135 u32 pm;
136 u32 reg_val;
137
138 mutex_lock(&chip->lock);
139 pm = ioread32(&chip->reg->regs[chip->ch].pm) &
140 ((1 << num_ports[chip->ch]) - 1);
141 pm |= (1 << nr);
142 iowrite32(pm, &chip->reg->regs[chip->ch].pm);
143
144 reg_val = ioread32(&chip->reg->regs[chip->ch].po);
145 if (val)
146 reg_val |= (1 << nr);
147 else
148 reg_val &= ~(1 << nr);
149 iowrite32(reg_val, &chip->reg->regs[chip->ch].po);
150
151 mutex_unlock(&chip->lock);
152
153 return 0;
154}
155
156static int ioh_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
157{
158 struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
159 u32 pm;
160
161 mutex_lock(&chip->lock);
162 pm = ioread32(&chip->reg->regs[chip->ch].pm) &
163 ((1 << num_ports[chip->ch]) - 1);
164 pm &= ~(1 << nr);
165 iowrite32(pm, &chip->reg->regs[chip->ch].pm);
166 mutex_unlock(&chip->lock);
167
168 return 0;
169}
170
171#ifdef CONFIG_PM
172
173
174
175static void ioh_gpio_save_reg_conf(struct ioh_gpio *chip)
176{
177 int i;
178
179 for (i = 0; i < 8; i ++, chip++) {
180 chip->ioh_gpio_reg.po_reg =
181 ioread32(&chip->reg->regs[chip->ch].po);
182 chip->ioh_gpio_reg.pm_reg =
183 ioread32(&chip->reg->regs[chip->ch].pm);
184 chip->ioh_gpio_reg.ien_reg =
185 ioread32(&chip->reg->regs[chip->ch].ien);
186 chip->ioh_gpio_reg.imask_reg =
187 ioread32(&chip->reg->regs[chip->ch].imask);
188 chip->ioh_gpio_reg.im0_reg =
189 ioread32(&chip->reg->regs[chip->ch].im_0);
190 chip->ioh_gpio_reg.im1_reg =
191 ioread32(&chip->reg->regs[chip->ch].im_1);
192 if (i < 4)
193 chip->ioh_gpio_reg.use_sel_reg =
194 ioread32(&chip->reg->ioh_sel_reg[i]);
195 }
196}
197
198
199
200
201static void ioh_gpio_restore_reg_conf(struct ioh_gpio *chip)
202{
203 int i;
204
205 for (i = 0; i < 8; i ++, chip++) {
206 iowrite32(chip->ioh_gpio_reg.po_reg,
207 &chip->reg->regs[chip->ch].po);
208 iowrite32(chip->ioh_gpio_reg.pm_reg,
209 &chip->reg->regs[chip->ch].pm);
210 iowrite32(chip->ioh_gpio_reg.ien_reg,
211 &chip->reg->regs[chip->ch].ien);
212 iowrite32(chip->ioh_gpio_reg.imask_reg,
213 &chip->reg->regs[chip->ch].imask);
214 iowrite32(chip->ioh_gpio_reg.im0_reg,
215 &chip->reg->regs[chip->ch].im_0);
216 iowrite32(chip->ioh_gpio_reg.im1_reg,
217 &chip->reg->regs[chip->ch].im_1);
218 if (i < 4)
219 iowrite32(chip->ioh_gpio_reg.use_sel_reg,
220 &chip->reg->ioh_sel_reg[i]);
221 }
222}
223#endif
224
225static int ioh_gpio_to_irq(struct gpio_chip *gpio, unsigned offset)
226{
227 struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
228 return chip->irq_base + offset;
229}
230
231static void ioh_gpio_setup(struct ioh_gpio *chip, int num_port)
232{
233 struct gpio_chip *gpio = &chip->gpio;
234
235 gpio->label = dev_name(chip->dev);
236 gpio->owner = THIS_MODULE;
237 gpio->direction_input = ioh_gpio_direction_input;
238 gpio->get = ioh_gpio_get;
239 gpio->direction_output = ioh_gpio_direction_output;
240 gpio->set = ioh_gpio_set;
241 gpio->dbg_show = NULL;
242 gpio->base = -1;
243 gpio->ngpio = num_port;
244 gpio->can_sleep = 0;
245 gpio->to_irq = ioh_gpio_to_irq;
246}
247
248static int ioh_irq_type(struct irq_data *d, unsigned int type)
249{
250 u32 im;
251 void __iomem *im_reg;
252 u32 ien;
253 u32 im_pos;
254 int ch;
255 unsigned long flags;
256 u32 val;
257 int irq = d->irq;
258 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
259 struct ioh_gpio *chip = gc->private;
260
261 ch = irq - chip->irq_base;
262 if (irq <= chip->irq_base + 7) {
263 im_reg = &chip->reg->regs[chip->ch].im_0;
264 im_pos = ch;
265 } else {
266 im_reg = &chip->reg->regs[chip->ch].im_1;
267 im_pos = ch - 8;
268 }
269 dev_dbg(chip->dev, "%s:irq=%d type=%d ch=%d pos=%d type=%d\n",
270 __func__, irq, type, ch, im_pos, type);
271
272 spin_lock_irqsave(&chip->spinlock, flags);
273
274 switch (type) {
275 case IRQ_TYPE_EDGE_RISING:
276 val = IOH_EDGE_RISING;
277 break;
278 case IRQ_TYPE_EDGE_FALLING:
279 val = IOH_EDGE_FALLING;
280 break;
281 case IRQ_TYPE_EDGE_BOTH:
282 val = IOH_EDGE_BOTH;
283 break;
284 case IRQ_TYPE_LEVEL_HIGH:
285 val = IOH_LEVEL_H;
286 break;
287 case IRQ_TYPE_LEVEL_LOW:
288 val = IOH_LEVEL_L;
289 break;
290 case IRQ_TYPE_PROBE:
291 goto end;
292 default:
293 dev_warn(chip->dev, "%s: unknown type(%dd)",
294 __func__, type);
295 goto end;
296 }
297
298
299 im = ioread32(im_reg) & ~(IOH_IM_MASK << (im_pos * 4));
300 iowrite32(im | (val << (im_pos * 4)), im_reg);
301
302
303 iowrite32(BIT(ch), &chip->reg->regs[chip->ch].iclr);
304
305
306 iowrite32(BIT(ch), &chip->reg->regs[chip->ch].imaskclr);
307
308
309 ien = ioread32(&chip->reg->regs[chip->ch].ien);
310 iowrite32(ien | BIT(ch), &chip->reg->regs[chip->ch].ien);
311end:
312 spin_unlock_irqrestore(&chip->spinlock, flags);
313
314 return 0;
315}
316
317static void ioh_irq_unmask(struct irq_data *d)
318{
319 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
320 struct ioh_gpio *chip = gc->private;
321
322 iowrite32(1 << (d->irq - chip->irq_base),
323 &chip->reg->regs[chip->ch].imaskclr);
324}
325
326static void ioh_irq_mask(struct irq_data *d)
327{
328 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
329 struct ioh_gpio *chip = gc->private;
330
331 iowrite32(1 << (d->irq - chip->irq_base),
332 &chip->reg->regs[chip->ch].imask);
333}
334
335static void ioh_irq_disable(struct irq_data *d)
336{
337 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
338 struct ioh_gpio *chip = gc->private;
339 unsigned long flags;
340 u32 ien;
341
342 spin_lock_irqsave(&chip->spinlock, flags);
343 ien = ioread32(&chip->reg->regs[chip->ch].ien);
344 ien &= ~(1 << (d->irq - chip->irq_base));
345 iowrite32(ien, &chip->reg->regs[chip->ch].ien);
346 spin_unlock_irqrestore(&chip->spinlock, flags);
347}
348
349static void ioh_irq_enable(struct irq_data *d)
350{
351 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
352 struct ioh_gpio *chip = gc->private;
353 unsigned long flags;
354 u32 ien;
355
356 spin_lock_irqsave(&chip->spinlock, flags);
357 ien = ioread32(&chip->reg->regs[chip->ch].ien);
358 ien |= 1 << (d->irq - chip->irq_base);
359 iowrite32(ien, &chip->reg->regs[chip->ch].ien);
360 spin_unlock_irqrestore(&chip->spinlock, flags);
361}
362
363static irqreturn_t ioh_gpio_handler(int irq, void *dev_id)
364{
365 struct ioh_gpio *chip = dev_id;
366 u32 reg_val;
367 int i, j;
368 int ret = IRQ_NONE;
369
370 for (i = 0; i < 8; i++, chip++) {
371 reg_val = ioread32(&chip->reg->regs[i].istatus);
372 for (j = 0; j < num_ports[i]; j++) {
373 if (reg_val & BIT(j)) {
374 dev_dbg(chip->dev,
375 "%s:[%d]:irq=%d status=0x%x\n",
376 __func__, j, irq, reg_val);
377 iowrite32(BIT(j),
378 &chip->reg->regs[chip->ch].iclr);
379 generic_handle_irq(chip->irq_base + j);
380 ret = IRQ_HANDLED;
381 }
382 }
383 }
384 return ret;
385}
386
387static __devinit void ioh_gpio_alloc_generic_chip(struct ioh_gpio *chip,
388 unsigned int irq_start, unsigned int num)
389{
390 struct irq_chip_generic *gc;
391 struct irq_chip_type *ct;
392
393 gc = irq_alloc_generic_chip("ioh_gpio", 1, irq_start, chip->base,
394 handle_simple_irq);
395 gc->private = chip;
396 ct = gc->chip_types;
397
398 ct->chip.irq_mask = ioh_irq_mask;
399 ct->chip.irq_unmask = ioh_irq_unmask;
400 ct->chip.irq_set_type = ioh_irq_type;
401 ct->chip.irq_disable = ioh_irq_disable;
402 ct->chip.irq_enable = ioh_irq_enable;
403
404 irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
405 IRQ_NOREQUEST | IRQ_NOPROBE, 0);
406}
407
408static int __devinit ioh_gpio_probe(struct pci_dev *pdev,
409 const struct pci_device_id *id)
410{
411 int ret;
412 int i, j;
413 struct ioh_gpio *chip;
414 void __iomem *base;
415 void *chip_save;
416 int irq_base;
417
418 ret = pci_enable_device(pdev);
419 if (ret) {
420 dev_err(&pdev->dev, "%s : pci_enable_device failed", __func__);
421 goto err_pci_enable;
422 }
423
424 ret = pci_request_regions(pdev, KBUILD_MODNAME);
425 if (ret) {
426 dev_err(&pdev->dev, "pci_request_regions failed-%d", ret);
427 goto err_request_regions;
428 }
429
430 base = pci_iomap(pdev, 1, 0);
431 if (!base) {
432 dev_err(&pdev->dev, "%s : pci_iomap failed", __func__);
433 ret = -ENOMEM;
434 goto err_iomap;
435 }
436
437 chip_save = kzalloc(sizeof(*chip) * 8, GFP_KERNEL);
438 if (chip_save == NULL) {
439 dev_err(&pdev->dev, "%s : kzalloc failed", __func__);
440 ret = -ENOMEM;
441 goto err_kzalloc;
442 }
443
444 chip = chip_save;
445 for (i = 0; i < 8; i++, chip++) {
446 chip->dev = &pdev->dev;
447 chip->base = base;
448 chip->reg = chip->base;
449 chip->ch = i;
450 mutex_init(&chip->lock);
451 spin_lock_init(&chip->spinlock);
452 ioh_gpio_setup(chip, num_ports[i]);
453 ret = gpiochip_add(&chip->gpio);
454 if (ret) {
455 dev_err(&pdev->dev, "IOH gpio: Failed to register GPIO\n");
456 goto err_gpiochip_add;
457 }
458 }
459
460 chip = chip_save;
461 for (j = 0; j < 8; j++, chip++) {
462 irq_base = irq_alloc_descs(-1, IOH_IRQ_BASE, num_ports[j],
463 NUMA_NO_NODE);
464 if (irq_base < 0) {
465 dev_warn(&pdev->dev,
466 "ml_ioh_gpio: Failed to get IRQ base num\n");
467 chip->irq_base = -1;
468 goto err_irq_alloc_descs;
469 }
470 chip->irq_base = irq_base;
471 ioh_gpio_alloc_generic_chip(chip, irq_base, num_ports[j]);
472 }
473
474 chip = chip_save;
475 ret = request_irq(pdev->irq, ioh_gpio_handler,
476 IRQF_SHARED, KBUILD_MODNAME, chip);
477 if (ret != 0) {
478 dev_err(&pdev->dev,
479 "%s request_irq failed\n", __func__);
480 goto err_request_irq;
481 }
482
483 pci_set_drvdata(pdev, chip);
484
485 return 0;
486
487err_request_irq:
488 chip = chip_save;
489err_irq_alloc_descs:
490 while (--j >= 0) {
491 chip--;
492 irq_free_descs(chip->irq_base, num_ports[j]);
493 }
494
495 chip = chip_save;
496err_gpiochip_add:
497 while (--i >= 0) {
498 chip--;
499 ret = gpiochip_remove(&chip->gpio);
500 if (ret)
501 dev_err(&pdev->dev, "Failed gpiochip_remove(%d)\n", i);
502 }
503 kfree(chip_save);
504
505err_kzalloc:
506 pci_iounmap(pdev, base);
507
508err_iomap:
509 pci_release_regions(pdev);
510
511err_request_regions:
512 pci_disable_device(pdev);
513
514err_pci_enable:
515
516 dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
517 return ret;
518}
519
520static void __devexit ioh_gpio_remove(struct pci_dev *pdev)
521{
522 int err;
523 int i;
524 struct ioh_gpio *chip = pci_get_drvdata(pdev);
525 void *chip_save;
526
527 chip_save = chip;
528
529 free_irq(pdev->irq, chip);
530
531 for (i = 0; i < 8; i++, chip++) {
532 irq_free_descs(chip->irq_base, num_ports[i]);
533 err = gpiochip_remove(&chip->gpio);
534 if (err)
535 dev_err(&pdev->dev, "Failed gpiochip_remove\n");
536 }
537
538 chip = chip_save;
539 pci_iounmap(pdev, chip->base);
540 pci_release_regions(pdev);
541 pci_disable_device(pdev);
542 kfree(chip);
543}
544
545#ifdef CONFIG_PM
546static int ioh_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
547{
548 s32 ret;
549 struct ioh_gpio *chip = pci_get_drvdata(pdev);
550 unsigned long flags;
551
552 spin_lock_irqsave(&chip->spinlock, flags);
553 ioh_gpio_save_reg_conf(chip);
554 spin_unlock_irqrestore(&chip->spinlock, flags);
555
556 ret = pci_save_state(pdev);
557 if (ret) {
558 dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
559 return ret;
560 }
561 pci_disable_device(pdev);
562 pci_set_power_state(pdev, PCI_D0);
563 ret = pci_enable_wake(pdev, PCI_D0, 1);
564 if (ret)
565 dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);
566
567 return 0;
568}
569
570static int ioh_gpio_resume(struct pci_dev *pdev)
571{
572 s32 ret;
573 struct ioh_gpio *chip = pci_get_drvdata(pdev);
574 unsigned long flags;
575
576 ret = pci_enable_wake(pdev, PCI_D0, 0);
577
578 pci_set_power_state(pdev, PCI_D0);
579 ret = pci_enable_device(pdev);
580 if (ret) {
581 dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
582 return ret;
583 }
584 pci_restore_state(pdev);
585
586 spin_lock_irqsave(&chip->spinlock, flags);
587 iowrite32(0x01, &chip->reg->srst);
588 iowrite32(0x00, &chip->reg->srst);
589 ioh_gpio_restore_reg_conf(chip);
590 spin_unlock_irqrestore(&chip->spinlock, flags);
591
592 return 0;
593}
594#else
595#define ioh_gpio_suspend NULL
596#define ioh_gpio_resume NULL
597#endif
598
599static DEFINE_PCI_DEVICE_TABLE(ioh_gpio_pcidev_id) = {
600 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x802E) },
601 { 0, }
602};
603MODULE_DEVICE_TABLE(pci, ioh_gpio_pcidev_id);
604
605static struct pci_driver ioh_gpio_driver = {
606 .name = "ml_ioh_gpio",
607 .id_table = ioh_gpio_pcidev_id,
608 .probe = ioh_gpio_probe,
609 .remove = __devexit_p(ioh_gpio_remove),
610 .suspend = ioh_gpio_suspend,
611 .resume = ioh_gpio_resume
612};
613
614module_pci_driver(ioh_gpio_driver);
615
616MODULE_DESCRIPTION("OKI SEMICONDUCTOR ML-IOH series GPIO Driver");
617MODULE_LICENSE("GPL");
618
