summaryrefslogtreecommitdiff
path: root/drivers/gpio/gpio-intel-mid.c
blob: aa28c65eb6b4f3a98e7aa6d5a1a1eac28d1c0c06 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
/*
 * Intel MID GPIO driver
 *
 * Copyright (c) 2008-2014 Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

/* Supports:
 * Moorestown platform Langwell chip.
 * Medfield platform Penwell chip.
 * Clovertrail platform Cloverview chip.
 * Merrifield platform Tangier chip.
 */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/stddef.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/gpio/driver.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>

#define INTEL_MID_IRQ_TYPE_EDGE		(1 << 0)
#define INTEL_MID_IRQ_TYPE_LEVEL	(1 << 1)

/*
 * Langwell chip has 64 pins and thus there are 2 32bit registers to control
 * each feature, while Penwell chip has 96 pins for each block, and need 3 32bit
 * registers to control them, so we only define the order here instead of a
 * structure, to get a bit offset for a pin (use GPDR as an example):
 *
 * nreg = ngpio / 32;
 * reg = offset / 32;
 * bit = offset % 32;
 * reg_addr = reg_base + GPDR * nreg * 4 + reg * 4;
 *
 * so the bit of reg_addr is to control pin offset's GPDR feature
*/

enum GPIO_REG {
	GPLR = 0,	/* pin level read-only */
	GPDR,		/* pin direction */
	GPSR,		/* pin set */
	GPCR,		/* pin clear */
	GRER,		/* rising edge detect */
	GFER,		/* falling edge detect */
	GEDR,		/* edge detect result */
	GAFR,		/* alt function */
};

/* intel_mid gpio driver data */
struct intel_mid_gpio_ddata {
	u16 ngpio;		/* number of gpio pins */
	u32 gplr_offset;	/* offset of first GPLR register from base */
	u32 flis_base;		/* base address of FLIS registers */
	u32 flis_len;		/* length of FLIS registers */
	u32 (*get_flis_offset)(int gpio);
	u32 chip_irq_type;	/* chip interrupt type */
};

struct intel_mid_gpio {
	struct gpio_chip		chip;
	void __iomem			*reg_base;
	spinlock_t			lock;
	struct pci_dev			*pdev;
};

static inline struct intel_mid_gpio *to_intel_gpio_priv(struct gpio_chip *gc)
{
	return container_of(gc, struct intel_mid_gpio, chip);
}

static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned offset,
			      enum GPIO_REG reg_type)
{
	struct intel_mid_gpio *priv = to_intel_gpio_priv(chip);
	unsigned nreg = chip->ngpio / 32;
	u8 reg = offset / 32;

	return priv->reg_base + reg_type * nreg * 4 + reg * 4;
}

static void __iomem *gpio_reg_2bit(struct gpio_chip *chip, unsigned offset,
				   enum GPIO_REG reg_type)
{
	struct intel_mid_gpio *priv = to_intel_gpio_priv(chip);
	unsigned nreg = chip->ngpio / 32;
	u8 reg = offset / 16;

	return priv->reg_base + reg_type * nreg * 4 + reg * 4;
}

static int intel_gpio_request(struct gpio_chip *chip, unsigned offset)
{
	void __iomem *gafr = gpio_reg_2bit(chip, offset, GAFR);
	u32 value = readl(gafr);
	int shift = (offset % 16) << 1, af = (value >> shift) & 3;

	if (af) {
		value &= ~(3 << shift);
		writel(value, gafr);
	}
	return 0;
}

static int intel_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	void __iomem *gplr = gpio_reg(chip, offset, GPLR);

	return readl(gplr) & BIT(offset % 32);
}

static void intel_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	void __iomem *gpsr, *gpcr;

	if (value) {
		gpsr = gpio_reg(chip, offset, GPSR);
		writel(BIT(offset % 32), gpsr);
	} else {
		gpcr = gpio_reg(chip, offset, GPCR);
		writel(BIT(offset % 32), gpcr);
	}
}

static int intel_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
	struct intel_mid_gpio *priv = to_intel_gpio_priv(chip);
	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
	u32 value;
	unsigned long flags;

	if (priv->pdev)
		pm_runtime_get(&priv->pdev->dev);

	spin_lock_irqsave(&priv->lock, flags);
	value = readl(gpdr);
	value &= ~BIT(offset % 32);
	writel(value, gpdr);
	spin_unlock_irqrestore(&priv->lock, flags);

	if (priv->pdev)
		pm_runtime_put(&priv->pdev->dev);

	return 0;
}

static int intel_gpio_direction_output(struct gpio_chip *chip,
			unsigned offset, int value)
{
	struct intel_mid_gpio *priv = to_intel_gpio_priv(chip);
	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
	unsigned long flags;

	intel_gpio_set(chip, offset, value);

	if (priv->pdev)
		pm_runtime_get(&priv->pdev->dev);

	spin_lock_irqsave(&priv->lock, flags);
	value = readl(gpdr);
	value |= BIT(offset % 32);
	writel(value, gpdr);
	spin_unlock_irqrestore(&priv->lock, flags);

	if (priv->pdev)
		pm_runtime_put(&priv->pdev->dev);

	return 0;
}

static int intel_mid_irq_type(struct irq_data *d, unsigned type)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct intel_mid_gpio *priv = to_intel_gpio_priv(gc);
	u32 gpio = irqd_to_hwirq(d);
	unsigned long flags;
	u32 value;
	void __iomem *grer = gpio_reg(&priv->chip, gpio, GRER);
	void __iomem *gfer = gpio_reg(&priv->chip, gpio, GFER);

	if (gpio >= priv->chip.ngpio)
		return -EINVAL;

	if (priv->pdev)
		pm_runtime_get(&priv->pdev->dev);

	spin_lock_irqsave(&priv->lock, flags);
	if (type & IRQ_TYPE_EDGE_RISING)
		value = readl(grer) | BIT(gpio % 32);
	else
		value = readl(grer) & (~BIT(gpio % 32));
	writel(value, grer);

	if (type & IRQ_TYPE_EDGE_FALLING)
		value = readl(gfer) | BIT(gpio % 32);
	else
		value = readl(gfer) & (~BIT(gpio % 32));
	writel(value, gfer);
	spin_unlock_irqrestore(&priv->lock, flags);

	if (priv->pdev)
		pm_runtime_put(&priv->pdev->dev);

	return 0;
}

static void intel_mid_irq_unmask(struct irq_data *d)
{
}

static void intel_mid_irq_mask(struct irq_data *d)
{
}

static struct irq_chip intel_mid_irqchip = {
	.name		= "INTEL_MID-GPIO",
	.irq_mask	= intel_mid_irq_mask,
	.irq_unmask	= intel_mid_irq_unmask,
	.irq_set_type	= intel_mid_irq_type,
};

static const struct intel_mid_gpio_ddata gpio_lincroft = {
	.ngpio = 64,
};

static const struct intel_mid_gpio_ddata gpio_penwell_aon = {
	.ngpio = 96,
	.chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE,
};

static const struct intel_mid_gpio_ddata gpio_penwell_core = {
	.ngpio = 96,
	.chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE,
};

static const struct intel_mid_gpio_ddata gpio_cloverview_aon = {
	.ngpio = 96,
	.chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE | INTEL_MID_IRQ_TYPE_LEVEL,
};

static const struct intel_mid_gpio_ddata gpio_cloverview_core = {
	.ngpio = 96,
	.chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE,
};

static const struct intel_mid_gpio_ddata gpio_tangier = {
	.ngpio = 192,
	.gplr_offset = 4,
	.flis_base = 0xff0c0000,
	.flis_len = 0x8000,
	.get_flis_offset = NULL,
	.chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE,
};

static const struct pci_device_id intel_gpio_ids[] = {
	{
		/* Lincroft */
		PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x080f),
		.driver_data = (kernel_ulong_t)&gpio_lincroft,
	},
	{
		/* Penwell AON */
		PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081f),
		.driver_data = (kernel_ulong_t)&gpio_penwell_aon,
	},
	{
		/* Penwell Core */
		PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081a),
		.driver_data = (kernel_ulong_t)&gpio_penwell_core,
	},
	{
		/* Cloverview Aon */
		PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x08eb),
		.driver_data = (kernel_ulong_t)&gpio_cloverview_aon,
	},
	{
		/* Cloverview Core */
		PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x08f7),
		.driver_data = (kernel_ulong_t)&gpio_cloverview_core,
	},
	{
		/* Tangier */
		PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x1199),
		.driver_data = (kernel_ulong_t)&gpio_tangier,
	},
	{ 0 }
};
MODULE_DEVICE_TABLE(pci, intel_gpio_ids);

static void intel_mid_irq_handler(unsigned irq, struct irq_desc *desc)
{
	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
	struct intel_mid_gpio *priv = to_intel_gpio_priv(gc);
	struct irq_data *data = irq_desc_get_irq_data(desc);
	struct irq_chip *chip = irq_data_get_irq_chip(data);
	u32 base, gpio, mask;
	unsigned long pending;
	void __iomem *gedr;

	/* check GPIO controller to check which pin triggered the interrupt */
	for (base = 0; base < priv->chip.ngpio; base += 32) {
		gedr = gpio_reg(&priv->chip, base, GEDR);
		while ((pending = readl(gedr))) {
			gpio = __ffs(pending);
			mask = BIT(gpio);
			/* Clear before handling so we can't lose an edge */
			writel(mask, gedr);
			generic_handle_irq(irq_find_mapping(gc->irqdomain,
							    base + gpio));
		}
	}

	chip->irq_eoi(data);
}

static void intel_mid_irq_init_hw(struct intel_mid_gpio *priv)
{
	void __iomem *reg;
	unsigned base;

	for (base = 0; base < priv->chip.ngpio; base += 32) {
		/* Clear the rising-edge detect register */
		reg = gpio_reg(&priv->chip, base, GRER);
		writel(0, reg);
		/* Clear the falling-edge detect register */
		reg = gpio_reg(&priv->chip, base, GFER);
		writel(0, reg);
		/* Clear the edge detect status register */
		reg = gpio_reg(&priv->chip, base, GEDR);
		writel(~0, reg);
	}
}

static int intel_gpio_runtime_idle(struct device *dev)
{
	int err = pm_schedule_suspend(dev, 500);
	return err ?: -EBUSY;
}

static const struct dev_pm_ops intel_gpio_pm_ops = {
	SET_RUNTIME_PM_OPS(NULL, NULL, intel_gpio_runtime_idle)
};

static int intel_gpio_probe(struct pci_dev *pdev,
			  const struct pci_device_id *id)
{
	void __iomem *base;
	struct intel_mid_gpio *priv;
	u32 gpio_base;
	u32 irq_base;
	int retval;
	struct intel_mid_gpio_ddata *ddata =
				(struct intel_mid_gpio_ddata *)id->driver_data;

	retval = pcim_enable_device(pdev);
	if (retval)
		return retval;

	retval = pcim_iomap_regions(pdev, 1 << 0 | 1 << 1, pci_name(pdev));
	if (retval) {
		dev_err(&pdev->dev, "I/O memory mapping error\n");
		return retval;
	}

	base = pcim_iomap_table(pdev)[1];

	irq_base = readl(base);
	gpio_base = readl(sizeof(u32) + base);

	/* release the IO mapping, since we already get the info from bar1 */
	pcim_iounmap_regions(pdev, 1 << 1);

	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv) {
		dev_err(&pdev->dev, "can't allocate chip data\n");
		return -ENOMEM;
	}

	priv->reg_base = pcim_iomap_table(pdev)[0];
	priv->chip.label = dev_name(&pdev->dev);
	priv->chip.dev = &pdev->dev;
	priv->chip.request = intel_gpio_request;
	priv->chip.direction_input = intel_gpio_direction_input;
	priv->chip.direction_output = intel_gpio_direction_output;
	priv->chip.get = intel_gpio_get;
	priv->chip.set = intel_gpio_set;
	priv->chip.base = gpio_base;
	priv->chip.ngpio = ddata->ngpio;
	priv->chip.can_sleep = false;
	priv->pdev = pdev;

	spin_lock_init(&priv->lock);

	pci_set_drvdata(pdev, priv);
	retval = gpiochip_add(&priv->chip);
	if (retval) {
		dev_err(&pdev->dev, "gpiochip_add error %d\n", retval);
		return retval;
	}

	retval = gpiochip_irqchip_add(&priv->chip,
				      &intel_mid_irqchip,
				      irq_base,
				      handle_simple_irq,
				      IRQ_TYPE_NONE);
	if (retval) {
		dev_err(&pdev->dev,
			"could not connect irqchip to gpiochip\n");
		return retval;
	}

	intel_mid_irq_init_hw(priv);

	gpiochip_set_chained_irqchip(&priv->chip,
				     &intel_mid_irqchip,
				     pdev->irq,
				     intel_mid_irq_handler);

	pm_runtime_put_noidle(&pdev->dev);
	pm_runtime_allow(&pdev->dev);

	return 0;
}

static struct pci_driver intel_gpio_driver = {
	.name		= "intel_mid_gpio",
	.id_table	= intel_gpio_ids,
	.probe		= intel_gpio_probe,
	.driver		= {
		.pm	= &intel_gpio_pm_ops,
	},
};

static int __init intel_gpio_init(void)
{
	return pci_register_driver(&intel_gpio_driver);
}

device_initcall(intel_gpio_init);