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powercap: restrict energy meter to root access
[linux/fpc-iii.git] / drivers / gpio / gpio-ml-ioh.c
blobe9b607417df976341d8f166fb2095d1c581d6ce0
1 /*
2 * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
16 */
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
36 struct 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
51 struct 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
59 /**
60 * struct ioh_gpio_reg_data - The register store data.
61 * @ien_reg To store contents of interrupt enable register.
62 * @imask_reg: To store contents of interrupt mask regist
63 * @po_reg: To store contents of PO register.
64 * @pm_reg: To store contents of PM register.
65 * @im0_reg: To store contents of interrupt mode regist0
66 * @im1_reg: To store contents of interrupt mode regist1
67 * @use_sel_reg: To store contents of GPIO_USE_SEL0~3
68 */
69 struct 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 };
78
79 /**
80 * struct ioh_gpio - GPIO private data structure.
81 * @base: PCI base address of Memory mapped I/O register.
82 * @reg: Memory mapped IOH GPIO register list.
83 * @dev: Pointer to device structure.
84 * @gpio: Data for GPIO infrastructure.
85 * @ioh_gpio_reg: Memory mapped Register data is saved here
86 * when suspend.
87 * @gpio_use_sel: Save GPIO_USE_SEL1~4 register for PM
88 * @ch: Indicate GPIO channel
89 * @irq_base: Save base of IRQ number for interrupt
90 * @spinlock: Used for register access protection
91 */
92 struct ioh_gpio {
93 void __iomem *base;
94 struct ioh_regs __iomem *reg;
95 struct device *dev;
96 struct gpio_chip gpio;
97 struct ioh_gpio_reg_data ioh_gpio_reg;
98 u32 gpio_use_sel;
99 int ch;
100 int irq_base;
101 spinlock_t spinlock;
102 };
103
104 static const int num_ports[] = {6, 12, 16, 16, 15, 16, 16, 12};
105
106 static void ioh_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
107 {
108 u32 reg_val;
109 struct ioh_gpio *chip = gpiochip_get_data(gpio);
110 unsigned long flags;
111
112 spin_lock_irqsave(&chip->spinlock, flags);
113 reg_val = ioread32(&chip->reg->regs[chip->ch].po);
114 if (val)
115 reg_val |= (1 << nr);
116 else
117 reg_val &= ~(1 << nr);
118
119 iowrite32(reg_val, &chip->reg->regs[chip->ch].po);
120 spin_unlock_irqrestore(&chip->spinlock, flags);
121 }
122
123 static int ioh_gpio_get(struct gpio_chip *gpio, unsigned nr)
124 {
125 struct ioh_gpio *chip = gpiochip_get_data(gpio);
126
127 return !!(ioread32(&chip->reg->regs[chip->ch].pi) & (1 << nr));
128 }
129
130 static int ioh_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
131 int val)
132 {
133 struct ioh_gpio *chip = gpiochip_get_data(gpio);
134 u32 pm;
135 u32 reg_val;
136 unsigned long flags;
137
138 spin_lock_irqsave(&chip->spinlock, flags);
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 spin_unlock_irqrestore(&chip->spinlock, flags);
152
153 return 0;
154 }
155
156 static int ioh_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
157 {
158 struct ioh_gpio *chip = gpiochip_get_data(gpio);
159 u32 pm;
160 unsigned long flags;
161
162 spin_lock_irqsave(&chip->spinlock, flags);
163 pm = ioread32(&chip->reg->regs[chip->ch].pm) &
164 ((1 << num_ports[chip->ch]) - 1);
165 pm &= ~(1 << nr);
166 iowrite32(pm, &chip->reg->regs[chip->ch].pm);
167 spin_unlock_irqrestore(&chip->spinlock, flags);
168
169 return 0;
170 }
171
172 #ifdef CONFIG_PM
173 /*
174 * Save register configuration and disable interrupts.
175 */
176 static void ioh_gpio_save_reg_conf(struct ioh_gpio *chip)
177 {
178 int i;
179
180 for (i = 0; i < 8; i ++, chip++) {
181 chip->ioh_gpio_reg.po_reg =
182 ioread32(&chip->reg->regs[chip->ch].po);
183 chip->ioh_gpio_reg.pm_reg =
184 ioread32(&chip->reg->regs[chip->ch].pm);
185 chip->ioh_gpio_reg.ien_reg =
186 ioread32(&chip->reg->regs[chip->ch].ien);
187 chip->ioh_gpio_reg.imask_reg =
188 ioread32(&chip->reg->regs[chip->ch].imask);
189 chip->ioh_gpio_reg.im0_reg =
190 ioread32(&chip->reg->regs[chip->ch].im_0);
191 chip->ioh_gpio_reg.im1_reg =
192 ioread32(&chip->reg->regs[chip->ch].im_1);
193 if (i < 4)
194 chip->ioh_gpio_reg.use_sel_reg =
195 ioread32(&chip->reg->ioh_sel_reg[i]);
196 }
197 }
198
199 /*
200 * This function restores the register configuration of the GPIO device.
201 */
202 static void ioh_gpio_restore_reg_conf(struct ioh_gpio *chip)
203 {
204 int i;
205
206 for (i = 0; i < 8; i ++, chip++) {
207 iowrite32(chip->ioh_gpio_reg.po_reg,
208 &chip->reg->regs[chip->ch].po);
209 iowrite32(chip->ioh_gpio_reg.pm_reg,
210 &chip->reg->regs[chip->ch].pm);
211 iowrite32(chip->ioh_gpio_reg.ien_reg,
212 &chip->reg->regs[chip->ch].ien);
213 iowrite32(chip->ioh_gpio_reg.imask_reg,
214 &chip->reg->regs[chip->ch].imask);
215 iowrite32(chip->ioh_gpio_reg.im0_reg,
216 &chip->reg->regs[chip->ch].im_0);
217 iowrite32(chip->ioh_gpio_reg.im1_reg,
218 &chip->reg->regs[chip->ch].im_1);
219 if (i < 4)
220 iowrite32(chip->ioh_gpio_reg.use_sel_reg,
221 &chip->reg->ioh_sel_reg[i]);
222 }
223 }
224 #endif
225
226 static int ioh_gpio_to_irq(struct gpio_chip *gpio, unsigned offset)
227 {
228 struct ioh_gpio *chip = gpiochip_get_data(gpio);
229 return chip->irq_base + offset;
230 }
231
232 static void ioh_gpio_setup(struct ioh_gpio *chip, int num_port)
233 {
234 struct gpio_chip *gpio = &chip->gpio;
235
236 gpio->label = dev_name(chip->dev);
237 gpio->owner = THIS_MODULE;
238 gpio->direction_input = ioh_gpio_direction_input;
239 gpio->get = ioh_gpio_get;
240 gpio->direction_output = ioh_gpio_direction_output;
241 gpio->set = ioh_gpio_set;
242 gpio->dbg_show = NULL;
243 gpio->base = -1;
244 gpio->ngpio = num_port;
245 gpio->can_sleep = false;
246 gpio->to_irq = ioh_gpio_to_irq;
247 }
248
249 static int ioh_irq_type(struct irq_data *d, unsigned int type)
250 {
251 u32 im;
252 void __iomem *im_reg;
253 u32 ien;
254 u32 im_pos;
255 int ch;
256 unsigned long flags;
257 u32 val;
258 int irq = d->irq;
259 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
260 struct ioh_gpio *chip = gc->private;
261
262 ch = irq - chip->irq_base;
263 if (irq <= chip->irq_base + 7) {
264 im_reg = &chip->reg->regs[chip->ch].im_0;
265 im_pos = ch;
266 } else {
267 im_reg = &chip->reg->regs[chip->ch].im_1;
268 im_pos = ch - 8;
269 }
270 dev_dbg(chip->dev, "%s:irq=%d type=%d ch=%d pos=%d type=%d\n",
271 __func__, irq, type, ch, im_pos, type);
272
273 spin_lock_irqsave(&chip->spinlock, flags);
274
275 switch (type) {
276 case IRQ_TYPE_EDGE_RISING:
277 val = IOH_EDGE_RISING;
278 break;
279 case IRQ_TYPE_EDGE_FALLING:
280 val = IOH_EDGE_FALLING;
281 break;
282 case IRQ_TYPE_EDGE_BOTH:
283 val = IOH_EDGE_BOTH;
284 break;
285 case IRQ_TYPE_LEVEL_HIGH:
286 val = IOH_LEVEL_H;
287 break;
288 case IRQ_TYPE_LEVEL_LOW:
289 val = IOH_LEVEL_L;
290 break;
291 case IRQ_TYPE_PROBE:
292 goto end;
293 default:
294 dev_warn(chip->dev, "%s: unknown type(%dd)",
295 __func__, type);
296 goto end;
297 }
298
299 /* Set interrupt mode */
300 im = ioread32(im_reg) & ~(IOH_IM_MASK << (im_pos * 4));
301 iowrite32(im | (val << (im_pos * 4)), im_reg);
302
303 /* iclr */
304 iowrite32(BIT(ch), &chip->reg->regs[chip->ch].iclr);
305
306 /* IMASKCLR */
307 iowrite32(BIT(ch), &chip->reg->regs[chip->ch].imaskclr);
308
309 /* Enable interrupt */
310 ien = ioread32(&chip->reg->regs[chip->ch].ien);
311 iowrite32(ien | BIT(ch), &chip->reg->regs[chip->ch].ien);
312 end:
313 spin_unlock_irqrestore(&chip->spinlock, flags);
314
315 return 0;
316 }
317
318 static void ioh_irq_unmask(struct irq_data *d)
319 {
320 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
321 struct ioh_gpio *chip = gc->private;
322
323 iowrite32(1 << (d->irq - chip->irq_base),
324 &chip->reg->regs[chip->ch].imaskclr);
325 }
326
327 static void ioh_irq_mask(struct irq_data *d)
328 {
329 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
330 struct ioh_gpio *chip = gc->private;
331
332 iowrite32(1 << (d->irq - chip->irq_base),
333 &chip->reg->regs[chip->ch].imask);
334 }
335
336 static void ioh_irq_disable(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
350 static void ioh_irq_enable(struct irq_data *d)
351 {
352 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
353 struct ioh_gpio *chip = gc->private;
354 unsigned long flags;
355 u32 ien;
356
357 spin_lock_irqsave(&chip->spinlock, flags);
358 ien = ioread32(&chip->reg->regs[chip->ch].ien);
359 ien |= 1 << (d->irq - chip->irq_base);
360 iowrite32(ien, &chip->reg->regs[chip->ch].ien);
361 spin_unlock_irqrestore(&chip->spinlock, flags);
362 }
363
364 static irqreturn_t ioh_gpio_handler(int irq, void *dev_id)
365 {
366 struct ioh_gpio *chip = dev_id;
367 u32 reg_val;
368 int i, j;
369 int ret = IRQ_NONE;
370
371 for (i = 0; i < 8; i++, chip++) {
372 reg_val = ioread32(&chip->reg->regs[i].istatus);
373 for (j = 0; j < num_ports[i]; j++) {
374 if (reg_val & BIT(j)) {
375 dev_dbg(chip->dev,
376 "%s:[%d]:irq=%d status=0x%x\n",
377 __func__, j, irq, reg_val);
378 iowrite32(BIT(j),
379 &chip->reg->regs[chip->ch].iclr);
380 generic_handle_irq(chip->irq_base + j);
381 ret = IRQ_HANDLED;
382 }
383 }
384 }
385 return ret;
386 }
387
388 static void ioh_gpio_alloc_generic_chip(struct ioh_gpio *chip,
389 unsigned int irq_start, unsigned int num)
390 {
391 struct irq_chip_generic *gc;
392 struct irq_chip_type *ct;
393
394 gc = irq_alloc_generic_chip("ioh_gpio", 1, irq_start, chip->base,
395 handle_simple_irq);
396 gc->private = chip;
397 ct = gc->chip_types;
398
399 ct->chip.irq_mask = ioh_irq_mask;
400 ct->chip.irq_unmask = ioh_irq_unmask;
401 ct->chip.irq_set_type = ioh_irq_type;
402 ct->chip.irq_disable = ioh_irq_disable;
403 ct->chip.irq_enable = ioh_irq_enable;
404
405 irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
406 IRQ_NOREQUEST | IRQ_NOPROBE, 0);
407 }
408
409 static int ioh_gpio_probe(struct pci_dev *pdev,
410 const struct pci_device_id *id)
411 {
412 int ret;
413 int i, j;
414 struct ioh_gpio *chip;
415 void __iomem *base;
416 void *chip_save;
417 int irq_base;
418
419 ret = pci_enable_device(pdev);
420 if (ret) {
421 dev_err(&pdev->dev, "%s : pci_enable_device failed", __func__);
422 goto err_pci_enable;
423 }
424
425 ret = pci_request_regions(pdev, KBUILD_MODNAME);
426 if (ret) {
427 dev_err(&pdev->dev, "pci_request_regions failed-%d", ret);
428 goto err_request_regions;
429 }
430
431 base = pci_iomap(pdev, 1, 0);
432 if (!base) {
433 dev_err(&pdev->dev, "%s : pci_iomap failed", __func__);
434 ret = -ENOMEM;
435 goto err_iomap;
436 }
437
438 chip_save = kzalloc(sizeof(*chip) * 8, GFP_KERNEL);
439 if (chip_save == NULL) {
440 dev_err(&pdev->dev, "%s : kzalloc failed", __func__);
441 ret = -ENOMEM;
442 goto err_kzalloc;
443 }
444
445 chip = chip_save;
446 for (i = 0; i < 8; i++, chip++) {
447 chip->dev = &pdev->dev;
448 chip->base = base;
449 chip->reg = chip->base;
450 chip->ch = i;
451 spin_lock_init(&chip->spinlock);
452 ioh_gpio_setup(chip, num_ports[i]);
453 ret = gpiochip_add_data(&chip->gpio, chip);
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 ret = irq_base;
469 goto err_irq_alloc_descs;
470 }
471 chip->irq_base = irq_base;
472 ioh_gpio_alloc_generic_chip(chip, irq_base, num_ports[j]);
473 }
474
475 chip = chip_save;
476 ret = request_irq(pdev->irq, ioh_gpio_handler,
477 IRQF_SHARED, KBUILD_MODNAME, chip);
478 if (ret != 0) {
479 dev_err(&pdev->dev,
480 "%s request_irq failed\n", __func__);
481 goto err_request_irq;
482 }
483
484 pci_set_drvdata(pdev, chip);
485
486 return 0;
487
488 err_request_irq:
489 chip = chip_save;
490 err_irq_alloc_descs:
491 while (--j >= 0) {
492 chip--;
493 irq_free_descs(chip->irq_base, num_ports[j]);
494 }
495
496 chip = chip_save;
497 err_gpiochip_add:
498 chip = chip_save;
499 while (--i >= 0) {
500 gpiochip_remove(&chip->gpio);
501 chip++;
502 }
503 kfree(chip_save);
504
505 err_kzalloc:
506 pci_iounmap(pdev, base);
507
508 err_iomap:
509 pci_release_regions(pdev);
510
511 err_request_regions:
512 pci_disable_device(pdev);
513
514 err_pci_enable:
515
516 dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
517 return ret;
518 }
519
520 static void ioh_gpio_remove(struct pci_dev *pdev)
521 {
522 int i;
523 struct ioh_gpio *chip = pci_get_drvdata(pdev);
524 void *chip_save;
525
526 chip_save = chip;
527
528 free_irq(pdev->irq, chip);
529
530 for (i = 0; i < 8; i++, chip++) {
531 irq_free_descs(chip->irq_base, num_ports[i]);
532 gpiochip_remove(&chip->gpio);
533 }
534
535 chip = chip_save;
536 pci_iounmap(pdev, chip->base);
537 pci_release_regions(pdev);
538 pci_disable_device(pdev);
539 kfree(chip);
540 }
541
542 #ifdef CONFIG_PM
543 static int ioh_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
544 {
545 s32 ret;
546 struct ioh_gpio *chip = pci_get_drvdata(pdev);
547 unsigned long flags;
548
549 spin_lock_irqsave(&chip->spinlock, flags);
550 ioh_gpio_save_reg_conf(chip);
551 spin_unlock_irqrestore(&chip->spinlock, flags);
552
553 ret = pci_save_state(pdev);
554 if (ret) {
555 dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
556 return ret;
557 }
558 pci_disable_device(pdev);
559 pci_set_power_state(pdev, PCI_D0);
560 ret = pci_enable_wake(pdev, PCI_D0, 1);
561 if (ret)
562 dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);
563
564 return 0;
565 }
566
567 static int ioh_gpio_resume(struct pci_dev *pdev)
568 {
569 s32 ret;
570 struct ioh_gpio *chip = pci_get_drvdata(pdev);
571 unsigned long flags;
572
573 ret = pci_enable_wake(pdev, PCI_D0, 0);
574
575 pci_set_power_state(pdev, PCI_D0);
576 ret = pci_enable_device(pdev);
577 if (ret) {
578 dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
579 return ret;
580 }
581 pci_restore_state(pdev);
582
583 spin_lock_irqsave(&chip->spinlock, flags);
584 iowrite32(0x01, &chip->reg->srst);
585 iowrite32(0x00, &chip->reg->srst);
586 ioh_gpio_restore_reg_conf(chip);
587 spin_unlock_irqrestore(&chip->spinlock, flags);
588
589 return 0;
590 }
591 #else
592 #define ioh_gpio_suspend NULL
593 #define ioh_gpio_resume NULL
594 #endif
595
596 static const struct pci_device_id ioh_gpio_pcidev_id[] = {
597 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x802E) },
598 { 0, }
599 };
600 MODULE_DEVICE_TABLE(pci, ioh_gpio_pcidev_id);
601
602 static struct pci_driver ioh_gpio_driver = {
603 .name = "ml_ioh_gpio",
604 .id_table = ioh_gpio_pcidev_id,
605 .probe = ioh_gpio_probe,
606 .remove = ioh_gpio_remove,
607 .suspend = ioh_gpio_suspend,
608 .resume = ioh_gpio_resume
609 };
610
611 module_pci_driver(ioh_gpio_driver);
612
613 MODULE_DESCRIPTION("OKI SEMICONDUCTOR ML-IOH series GPIO Driver");
614 MODULE_LICENSE("GPL");
Linux with added FPC-III support