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procfs: Mark create_proc_read_entry deprecated
[linux-2.6.git] / drivers / gpio / gpio-pch.c
blobcdf599687cf7b1e4704fa213cf77961bb8f66cfd
1 /*
2 * Copyright (C) 2011 LAPIS 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/pci.h>
20 #include <linux/gpio.h>
21 #include <linux/interrupt.h>
22 #include <linux/irq.h>
23
24 #define PCH_EDGE_FALLING 0
25 #define PCH_EDGE_RISING BIT(0)
26 #define PCH_LEVEL_L BIT(1)
27 #define PCH_LEVEL_H (BIT(0) | BIT(1))
28 #define PCH_EDGE_BOTH BIT(2)
29 #define PCH_IM_MASK (BIT(0) | BIT(1) | BIT(2))
30
31 #define PCH_IRQ_BASE 24
32
33 struct pch_regs {
34 u32 ien;
35 u32 istatus;
36 u32 idisp;
37 u32 iclr;
38 u32 imask;
39 u32 imaskclr;
40 u32 po;
41 u32 pi;
42 u32 pm;
43 u32 im0;
44 u32 im1;
45 u32 reserved[3];
46 u32 gpio_use_sel;
47 u32 reset;
48 };
49
50 enum pch_type_t {
51 INTEL_EG20T_PCH,
52 OKISEMI_ML7223m_IOH, /* LAPIS Semiconductor ML7223 IOH PCIe Bus-m */
53 OKISEMI_ML7223n_IOH /* LAPIS Semiconductor ML7223 IOH PCIe Bus-n */
54 };
55
56 /* Specifies number of GPIO PINS */
57 static int gpio_pins[] = {
58 [INTEL_EG20T_PCH] = 12,
59 [OKISEMI_ML7223m_IOH] = 8,
60 [OKISEMI_ML7223n_IOH] = 8,
61 };
62
63 /**
64 * struct pch_gpio_reg_data - The register store data.
65 * @ien_reg: To store contents of IEN register.
66 * @imask_reg: To store contents of IMASK register.
67 * @po_reg: To store contents of PO register.
68 * @pm_reg: To store contents of PM register.
69 * @im0_reg: To store contents of IM0 register.
70 * @im1_reg: To store contents of IM1 register.
71 * @gpio_use_sel_reg : To store contents of GPIO_USE_SEL register.
72 * (Only ML7223 Bus-n)
73 */
74 struct pch_gpio_reg_data {
75 u32 ien_reg;
76 u32 imask_reg;
77 u32 po_reg;
78 u32 pm_reg;
79 u32 im0_reg;
80 u32 im1_reg;
81 u32 gpio_use_sel_reg;
82 };
83
84 /**
85 * struct pch_gpio - GPIO private data structure.
86 * @base: PCI base address of Memory mapped I/O register.
87 * @reg: Memory mapped PCH GPIO register list.
88 * @dev: Pointer to device structure.
89 * @gpio: Data for GPIO infrastructure.
90 * @pch_gpio_reg: Memory mapped Register data is saved here
91 * when suspend.
92 * @lock: Used for register access protection
93 * @irq_base: Save base of IRQ number for interrupt
94 * @ioh: IOH ID
95 * @spinlock: Used for register access protection
96 */
97 struct pch_gpio {
98 void __iomem *base;
99 struct pch_regs __iomem *reg;
100 struct device *dev;
101 struct gpio_chip gpio;
102 struct pch_gpio_reg_data pch_gpio_reg;
103 int irq_base;
104 enum pch_type_t ioh;
105 spinlock_t spinlock;
106 };
107
108 static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
109 {
110 u32 reg_val;
111 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
112 unsigned long flags;
113
114 spin_lock_irqsave(&chip->spinlock, flags);
115 reg_val = ioread32(&chip->reg->po);
116 if (val)
117 reg_val |= (1 << nr);
118 else
119 reg_val &= ~(1 << nr);
120
121 iowrite32(reg_val, &chip->reg->po);
122 spin_unlock_irqrestore(&chip->spinlock, flags);
123 }
124
125 static int pch_gpio_get(struct gpio_chip *gpio, unsigned nr)
126 {
127 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
128
129 return ioread32(&chip->reg->pi) & (1 << nr);
130 }
131
132 static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
133 int val)
134 {
135 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
136 u32 pm;
137 u32 reg_val;
138 unsigned long flags;
139
140 spin_lock_irqsave(&chip->spinlock, flags);
141 pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1);
142 pm |= (1 << nr);
143 iowrite32(pm, &chip->reg->pm);
144
145 reg_val = ioread32(&chip->reg->po);
146 if (val)
147 reg_val |= (1 << nr);
148 else
149 reg_val &= ~(1 << nr);
150 iowrite32(reg_val, &chip->reg->po);
151 spin_unlock_irqrestore(&chip->spinlock, flags);
152
153 return 0;
154 }
155
156 static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
157 {
158 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
159 u32 pm;
160 unsigned long flags;
161
162 spin_lock_irqsave(&chip->spinlock, flags);
163 pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1);
164 pm &= ~(1 << nr);
165 iowrite32(pm, &chip->reg->pm);
166 spin_unlock_irqrestore(&chip->spinlock, flags);
167
168 return 0;
169 }
170
171 /*
172 * Save register configuration and disable interrupts.
173 */
174 static void pch_gpio_save_reg_conf(struct pch_gpio *chip)
175 {
176 chip->pch_gpio_reg.ien_reg = ioread32(&chip->reg->ien);
177 chip->pch_gpio_reg.imask_reg = ioread32(&chip->reg->imask);
178 chip->pch_gpio_reg.po_reg = ioread32(&chip->reg->po);
179 chip->pch_gpio_reg.pm_reg = ioread32(&chip->reg->pm);
180 chip->pch_gpio_reg.im0_reg = ioread32(&chip->reg->im0);
181 if (chip->ioh == INTEL_EG20T_PCH)
182 chip->pch_gpio_reg.im1_reg = ioread32(&chip->reg->im1);
183 if (chip->ioh == OKISEMI_ML7223n_IOH)
184 chip->pch_gpio_reg.gpio_use_sel_reg =\
185 ioread32(&chip->reg->gpio_use_sel);
186 }
187
188 /*
189 * This function restores the register configuration of the GPIO device.
190 */
191 static void pch_gpio_restore_reg_conf(struct pch_gpio *chip)
192 {
193 iowrite32(chip->pch_gpio_reg.ien_reg, &chip->reg->ien);
194 iowrite32(chip->pch_gpio_reg.imask_reg, &chip->reg->imask);
195 /* to store contents of PO register */
196 iowrite32(chip->pch_gpio_reg.po_reg, &chip->reg->po);
197 /* to store contents of PM register */
198 iowrite32(chip->pch_gpio_reg.pm_reg, &chip->reg->pm);
199 iowrite32(chip->pch_gpio_reg.im0_reg, &chip->reg->im0);
200 if (chip->ioh == INTEL_EG20T_PCH)
201 iowrite32(chip->pch_gpio_reg.im1_reg, &chip->reg->im1);
202 if (chip->ioh == OKISEMI_ML7223n_IOH)
203 iowrite32(chip->pch_gpio_reg.gpio_use_sel_reg,
204 &chip->reg->gpio_use_sel);
205 }
206
207 static int pch_gpio_to_irq(struct gpio_chip *gpio, unsigned offset)
208 {
209 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
210 return chip->irq_base + offset;
211 }
212
213 static void pch_gpio_setup(struct pch_gpio *chip)
214 {
215 struct gpio_chip *gpio = &chip->gpio;
216
217 gpio->label = dev_name(chip->dev);
218 gpio->dev = chip->dev;
219 gpio->owner = THIS_MODULE;
220 gpio->direction_input = pch_gpio_direction_input;
221 gpio->get = pch_gpio_get;
222 gpio->direction_output = pch_gpio_direction_output;
223 gpio->set = pch_gpio_set;
224 gpio->dbg_show = NULL;
225 gpio->base = -1;
226 gpio->ngpio = gpio_pins[chip->ioh];
227 gpio->can_sleep = 0;
228 gpio->to_irq = pch_gpio_to_irq;
229 }
230
231 static int pch_irq_type(struct irq_data *d, unsigned int type)
232 {
233 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
234 struct pch_gpio *chip = gc->private;
235 u32 im, im_pos, val;
236 u32 __iomem *im_reg;
237 unsigned long flags;
238 int ch, irq = d->irq;
239
240 ch = irq - chip->irq_base;
241 if (irq <= chip->irq_base + 7) {
242 im_reg = &chip->reg->im0;
243 im_pos = ch;
244 } else {
245 im_reg = &chip->reg->im1;
246 im_pos = ch - 8;
247 }
248 dev_dbg(chip->dev, "%s:irq=%d type=%d ch=%d pos=%d\n",
249 __func__, irq, type, ch, im_pos);
250
251 spin_lock_irqsave(&chip->spinlock, flags);
252
253 switch (type) {
254 case IRQ_TYPE_EDGE_RISING:
255 val = PCH_EDGE_RISING;
256 break;
257 case IRQ_TYPE_EDGE_FALLING:
258 val = PCH_EDGE_FALLING;
259 break;
260 case IRQ_TYPE_EDGE_BOTH:
261 val = PCH_EDGE_BOTH;
262 break;
263 case IRQ_TYPE_LEVEL_HIGH:
264 val = PCH_LEVEL_H;
265 break;
266 case IRQ_TYPE_LEVEL_LOW:
267 val = PCH_LEVEL_L;
268 break;
269 default:
270 goto unlock;
271 }
272
273 /* Set interrupt mode */
274 im = ioread32(im_reg) & ~(PCH_IM_MASK << (im_pos * 4));
275 iowrite32(im | (val << (im_pos * 4)), im_reg);
276
277 /* And the handler */
278 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
279 __irq_set_handler_locked(d->irq, handle_level_irq);
280 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
281 __irq_set_handler_locked(d->irq, handle_edge_irq);
282
283 unlock:
284 spin_unlock_irqrestore(&chip->spinlock, flags);
285 return 0;
286 }
287
288 static void pch_irq_unmask(struct irq_data *d)
289 {
290 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
291 struct pch_gpio *chip = gc->private;
292
293 iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->imaskclr);
294 }
295
296 static void pch_irq_mask(struct irq_data *d)
297 {
298 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
299 struct pch_gpio *chip = gc->private;
300
301 iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->imask);
302 }
303
304 static void pch_irq_ack(struct irq_data *d)
305 {
306 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
307 struct pch_gpio *chip = gc->private;
308
309 iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->iclr);
310 }
311
312 static irqreturn_t pch_gpio_handler(int irq, void *dev_id)
313 {
314 struct pch_gpio *chip = dev_id;
315 u32 reg_val = ioread32(&chip->reg->istatus);
316 int i, ret = IRQ_NONE;
317
318 for (i = 0; i < gpio_pins[chip->ioh]; i++) {
319 if (reg_val & BIT(i)) {
320 dev_dbg(chip->dev, "%s:[%d]:irq=%d status=0x%x\n",
321 __func__, i, irq, reg_val);
322 generic_handle_irq(chip->irq_base + i);
323 ret = IRQ_HANDLED;
324 }
325 }
326 return ret;
327 }
328
329 static void pch_gpio_alloc_generic_chip(struct pch_gpio *chip,
330 unsigned int irq_start, unsigned int num)
331 {
332 struct irq_chip_generic *gc;
333 struct irq_chip_type *ct;
334
335 gc = irq_alloc_generic_chip("pch_gpio", 1, irq_start, chip->base,
336 handle_simple_irq);
337 gc->private = chip;
338 ct = gc->chip_types;
339
340 ct->chip.irq_ack = pch_irq_ack;
341 ct->chip.irq_mask = pch_irq_mask;
342 ct->chip.irq_unmask = pch_irq_unmask;
343 ct->chip.irq_set_type = pch_irq_type;
344
345 irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
346 IRQ_NOREQUEST | IRQ_NOPROBE, 0);
347 }
348
349 static int pch_gpio_probe(struct pci_dev *pdev,
350 const struct pci_device_id *id)
351 {
352 s32 ret;
353 struct pch_gpio *chip;
354 int irq_base;
355 u32 msk;
356
357 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
358 if (chip == NULL)
359 return -ENOMEM;
360
361 chip->dev = &pdev->dev;
362 ret = pci_enable_device(pdev);
363 if (ret) {
364 dev_err(&pdev->dev, "%s : pci_enable_device FAILED", __func__);
365 goto err_pci_enable;
366 }
367
368 ret = pci_request_regions(pdev, KBUILD_MODNAME);
369 if (ret) {
370 dev_err(&pdev->dev, "pci_request_regions FAILED-%d", ret);
371 goto err_request_regions;
372 }
373
374 chip->base = pci_iomap(pdev, 1, 0);
375 if (!chip->base) {
376 dev_err(&pdev->dev, "%s : pci_iomap FAILED", __func__);
377 ret = -ENOMEM;
378 goto err_iomap;
379 }
380
381 if (pdev->device == 0x8803)
382 chip->ioh = INTEL_EG20T_PCH;
383 else if (pdev->device == 0x8014)
384 chip->ioh = OKISEMI_ML7223m_IOH;
385 else if (pdev->device == 0x8043)
386 chip->ioh = OKISEMI_ML7223n_IOH;
387
388 chip->reg = chip->base;
389 pci_set_drvdata(pdev, chip);
390 spin_lock_init(&chip->spinlock);
391 pch_gpio_setup(chip);
392 ret = gpiochip_add(&chip->gpio);
393 if (ret) {
394 dev_err(&pdev->dev, "PCH gpio: Failed to register GPIO\n");
395 goto err_gpiochip_add;
396 }
397
398 irq_base = irq_alloc_descs(-1, 0, gpio_pins[chip->ioh], NUMA_NO_NODE);
399 if (irq_base < 0) {
400 dev_warn(&pdev->dev, "PCH gpio: Failed to get IRQ base num\n");
401 chip->irq_base = -1;
402 goto end;
403 }
404 chip->irq_base = irq_base;
405
406 /* Mask all interrupts, but enable them */
407 msk = (1 << gpio_pins[chip->ioh]) - 1;
408 iowrite32(msk, &chip->reg->imask);
409 iowrite32(msk, &chip->reg->ien);
410
411 ret = request_irq(pdev->irq, pch_gpio_handler,
412 IRQF_SHARED, KBUILD_MODNAME, chip);
413 if (ret != 0) {
414 dev_err(&pdev->dev,
415 "%s request_irq failed\n", __func__);
416 goto err_request_irq;
417 }
418
419 pch_gpio_alloc_generic_chip(chip, irq_base, gpio_pins[chip->ioh]);
420
421 end:
422 return 0;
423
424 err_request_irq:
425 irq_free_descs(irq_base, gpio_pins[chip->ioh]);
426
427 ret = gpiochip_remove(&chip->gpio);
428 if (ret)
429 dev_err(&pdev->dev, "%s gpiochip_remove failed\n", __func__);
430
431 err_gpiochip_add:
432 pci_iounmap(pdev, chip->base);
433
434 err_iomap:
435 pci_release_regions(pdev);
436
437 err_request_regions:
438 pci_disable_device(pdev);
439
440 err_pci_enable:
441 kfree(chip);
442 dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
443 return ret;
444 }
445
446 static void pch_gpio_remove(struct pci_dev *pdev)
447 {
448 int err;
449 struct pch_gpio *chip = pci_get_drvdata(pdev);
450
451 if (chip->irq_base != -1) {
452 free_irq(pdev->irq, chip);
453
454 irq_free_descs(chip->irq_base, gpio_pins[chip->ioh]);
455 }
456
457 err = gpiochip_remove(&chip->gpio);
458 if (err)
459 dev_err(&pdev->dev, "Failed gpiochip_remove\n");
460
461 pci_iounmap(pdev, chip->base);
462 pci_release_regions(pdev);
463 pci_disable_device(pdev);
464 kfree(chip);
465 }
466
467 #ifdef CONFIG_PM
468 static int pch_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
469 {
470 s32 ret;
471 struct pch_gpio *chip = pci_get_drvdata(pdev);
472 unsigned long flags;
473
474 spin_lock_irqsave(&chip->spinlock, flags);
475 pch_gpio_save_reg_conf(chip);
476 spin_unlock_irqrestore(&chip->spinlock, flags);
477
478 ret = pci_save_state(pdev);
479 if (ret) {
480 dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
481 return ret;
482 }
483 pci_disable_device(pdev);
484 pci_set_power_state(pdev, PCI_D0);
485 ret = pci_enable_wake(pdev, PCI_D0, 1);
486 if (ret)
487 dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);
488
489 return 0;
490 }
491
492 static int pch_gpio_resume(struct pci_dev *pdev)
493 {
494 s32 ret;
495 struct pch_gpio *chip = pci_get_drvdata(pdev);
496 unsigned long flags;
497
498 ret = pci_enable_wake(pdev, PCI_D0, 0);
499
500 pci_set_power_state(pdev, PCI_D0);
501 ret = pci_enable_device(pdev);
502 if (ret) {
503 dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
504 return ret;
505 }
506 pci_restore_state(pdev);
507
508 spin_lock_irqsave(&chip->spinlock, flags);
509 iowrite32(0x01, &chip->reg->reset);
510 iowrite32(0x00, &chip->reg->reset);
511 pch_gpio_restore_reg_conf(chip);
512 spin_unlock_irqrestore(&chip->spinlock, flags);
513
514 return 0;
515 }
516 #else
517 #define pch_gpio_suspend NULL
518 #define pch_gpio_resume NULL
519 #endif
520
521 #define PCI_VENDOR_ID_ROHM 0x10DB
522 static DEFINE_PCI_DEVICE_TABLE(pch_gpio_pcidev_id) = {
523 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8803) },
524 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8014) },
525 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8043) },
526 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8803) },
527 { 0, }
528 };
529 MODULE_DEVICE_TABLE(pci, pch_gpio_pcidev_id);
530
531 static struct pci_driver pch_gpio_driver = {
532 .name = "pch_gpio",
533 .id_table = pch_gpio_pcidev_id,
534 .probe = pch_gpio_probe,
535 .remove = pch_gpio_remove,
536 .suspend = pch_gpio_suspend,
537 .resume = pch_gpio_resume
538 };
539
540 module_pci_driver(pch_gpio_driver);
541
542 MODULE_DESCRIPTION("PCH GPIO PCI Driver");
543 MODULE_LICENSE("GPL");
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