aboutsummaryrefslogtreecommitdiff
path: root/drivers/gpio/gpio-mpc8xxx.c
blob: ec3fcf0a7e125ce19b3604959717a00e0b981cc0 (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
/*
 * GPIOs on MPC512x/8349/8572/8610 and compatible
 *
 * Copyright (C) 2008 Peter Korsgaard <jacmet@sunsite.dk>
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2.  This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/irq.h>

#define MPC8XXX_GPIO_PINS	32

#define GPIO_DIR		0x00
#define GPIO_ODR		0x04
#define GPIO_DAT		0x08
#define GPIO_IER		0x0c
#define GPIO_IMR		0x10
#define GPIO_ICR		0x14
#define GPIO_ICR2		0x18

struct mpc8xxx_gpio_chip {
	struct of_mm_gpio_chip mm_gc;
	spinlock_t lock;

	/*
	 * shadowed data register to be able to clear/set output pins in
	 * open drain mode safely
	 */
	u32 data;
	struct irq_host *irq;
	void *of_dev_id_data;
};

static inline u32 mpc8xxx_gpio2mask(unsigned int gpio)
{
	return 1u << (MPC8XXX_GPIO_PINS - 1 - gpio);
}

static inline struct mpc8xxx_gpio_chip *
to_mpc8xxx_gpio_chip(struct of_mm_gpio_chip *mm)
{
	return container_of(mm, struct mpc8xxx_gpio_chip, mm_gc);
}

static void mpc8xxx_gpio_save_regs(struct of_mm_gpio_chip *mm)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);

	mpc8xxx_gc->data = in_be32(mm->regs + GPIO_DAT);
}

/* Workaround GPIO 1 errata on MPC8572/MPC8536. The status of GPIOs
 * defined as output cannot be determined by reading GPDAT register,
 * so we use shadow data register instead. The status of input pins
 * is determined by reading GPDAT register.
 */
static int mpc8572_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
	u32 val;
	struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);

	val = in_be32(mm->regs + GPIO_DAT) & ~in_be32(mm->regs + GPIO_DIR);

	return (val | mpc8xxx_gc->data) & mpc8xxx_gpio2mask(gpio);
}

static int mpc8xxx_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
	struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);

	return in_be32(mm->regs + GPIO_DAT) & mpc8xxx_gpio2mask(gpio);
}

static void mpc8xxx_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
	struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
	unsigned long flags;

	spin_lock_irqsave(&mpc8xxx_gc->lock, flags);

	if (val)
		mpc8xxx_gc->data |= mpc8xxx_gpio2mask(gpio);
	else
		mpc8xxx_gc->data &= ~mpc8xxx_gpio2mask(gpio);

	out_be32(mm->regs + GPIO_DAT, mpc8xxx_gc->data);

	spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
}

static int mpc8xxx_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
	struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
	unsigned long flags;

	spin_lock_irqsave(&mpc8xxx_gc->lock, flags);

	clrbits32(mm->regs + GPIO_DIR, mpc8xxx_gpio2mask(gpio));

	spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);

	return 0;
}

static int mpc8xxx_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
{
	struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
	unsigned long flags;

	mpc8xxx_gpio_set(gc, gpio, val);

	spin_lock_irqsave(&mpc8xxx_gc->lock, flags);

	setbits32(mm->regs + GPIO_DIR, mpc8xxx_gpio2mask(gpio));

	spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);

	return 0;
}

static int mpc8xxx_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
{
	struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);

	if (mpc8xxx_gc->irq && offset < MPC8XXX_GPIO_PINS)
		return irq_create_mapping(mpc8xxx_gc->irq, offset);
	else
		return -ENXIO;
}

static void mpc8xxx_gpio_irq_cascade(unsigned int irq, struct irq_desc *desc)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_desc_get_handler_data(desc);
	struct irq_chip *chip = irq_desc_get_chip(desc);
	struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
	unsigned int mask;

	mask = in_be32(mm->regs + GPIO_IER) & in_be32(mm->regs + GPIO_IMR);
	if (mask)
		generic_handle_irq(irq_linear_revmap(mpc8xxx_gc->irq,
						     32 - ffs(mask)));
	chip->irq_eoi(&desc->irq_data);
}

static void mpc8xxx_irq_unmask(struct irq_data *d)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
	struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
	unsigned long flags;

	spin_lock_irqsave(&mpc8xxx_gc->lock, flags);

	setbits32(mm->regs + GPIO_IMR, mpc8xxx_gpio2mask(irqd_to_hwirq(d)));

	spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
}

static void mpc8xxx_irq_mask(struct irq_data *d)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
	struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
	unsigned long flags;

	spin_lock_irqsave(&mpc8xxx_gc->lock, flags);

	clrbits32(mm->regs + GPIO_IMR, mpc8xxx_gpio2mask(irqd_to_hwirq(d)));

	spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
}

static void mpc8xxx_irq_ack(struct irq_data *d)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
	struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;

	out_be32(mm->regs + GPIO_IER, mpc8xxx_gpio2mask(irqd_to_hwirq(d)));
}

static int mpc8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
	struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
	unsigned long flags;

	switch (flow_type) {
	case IRQ_TYPE_EDGE_FALLING:
		spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
		setbits32(mm->regs + GPIO_ICR,
			  mpc8xxx_gpio2mask(irqd_to_hwirq(d)));
		spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
		break;

	case IRQ_TYPE_EDGE_BOTH:
		spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
		clrbits32(mm->regs + GPIO_ICR,
			  mpc8xxx_gpio2mask(irqd_to_hwirq(d)));
		spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

static int mpc512x_irq_set_type(struct irq_data *d, unsigned int flow_type)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
	struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
	unsigned long gpio = irqd_to_hwirq(d);
	void __iomem *reg;
	unsigned int shift;
	unsigned long flags;

	if (gpio < 16) {
		reg = mm->regs + GPIO_ICR;
		shift = (15 - gpio) * 2;
	} else {
		reg = mm->regs + GPIO_ICR2;
		shift = (15 - (gpio % 16)) * 2;
	}

	switch (flow_type) {
	case IRQ_TYPE_EDGE_FALLING:
	case IRQ_TYPE_LEVEL_LOW:
		spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
		clrsetbits_be32(reg, 3 << shift, 2 << shift);
		spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
		break;

	case IRQ_TYPE_EDGE_RISING:
	case IRQ_TYPE_LEVEL_HIGH:
		spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
		clrsetbits_be32(reg, 3 << shift, 1 << shift);
		spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
		break;

	case IRQ_TYPE_EDGE_BOTH:
		spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
		clrbits32(reg, 3 << shift);
		spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

static struct irq_chip mpc8xxx_irq_chip = {
	.name		= "mpc8xxx-gpio",
	.irq_unmask	= mpc8xxx_irq_unmask,
	.irq_mask	= mpc8xxx_irq_mask,
	.irq_ack	= mpc8xxx_irq_ack,
	.irq_set_type	= mpc8xxx_irq_set_type,
};

static int mpc8xxx_gpio_irq_map(struct irq_host *h, unsigned int virq,
				irq_hw_number_t hw)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = h->host_data;

	if (mpc8xxx_gc->of_dev_id_data)
		mpc8xxx_irq_chip.irq_set_type = mpc8xxx_gc->of_dev_id_data;

	irq_set_chip_data(virq, h->host_data);
	irq_set_chip_and_handler(virq, &mpc8xxx_irq_chip, handle_level_irq);
	irq_set_irq_type(virq, IRQ_TYPE_NONE);

	return 0;
}

static int mpc8xxx_gpio_irq_xlate(struct irq_host *h, struct device_node *ct,
				  const u32 *intspec, unsigned int intsize,
				  irq_hw_number_t *out_hwirq,
				  unsigned int *out_flags)

{
	/* interrupt sense values coming from the device tree equal either
	 * EDGE_FALLING or EDGE_BOTH
	 */
	*out_hwirq = intspec[0];
	*out_flags = intspec[1];

	return 0;
}

static struct irq_host_ops mpc8xxx_gpio_irq_ops = {
	.map	= mpc8xxx_gpio_irq_map,
	.xlate	= mpc8xxx_gpio_irq_xlate,
};

static struct of_device_id mpc8xxx_gpio_ids[] __initdata = {
	{ .compatible = "fsl,mpc8349-gpio", },
	{ .compatible = "fsl,mpc8572-gpio", },
	{ .compatible = "fsl,mpc8610-gpio", },
	{ .compatible = "fsl,mpc5121-gpio", .data = mpc512x_irq_set_type, },
	{ .compatible = "fsl,pq3-gpio",     },
	{ .compatible = "fsl,qoriq-gpio",   },
	{}
};

static void __init mpc8xxx_add_controller(struct device_node *np)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc;
	struct of_mm_gpio_chip *mm_gc;
	struct gpio_chip *gc;
	const struct of_device_id *id;
	unsigned hwirq;
	int ret;

	mpc8xxx_gc = kzalloc(sizeof(*mpc8xxx_gc), GFP_KERNEL);
	if (!mpc8xxx_gc) {
		ret = -ENOMEM;
		goto err;
	}

	spin_lock_init(&mpc8xxx_gc->lock);

	mm_gc = &mpc8xxx_gc->mm_gc;
	gc = &mm_gc->gc;

	mm_gc->save_regs = mpc8xxx_gpio_save_regs;
	gc->ngpio = MPC8XXX_GPIO_PINS;
	gc->direction_input = mpc8xxx_gpio_dir_in;
	gc->direction_output = mpc8xxx_gpio_dir_out;
	if (of_device_is_compatible(np, "fsl,mpc8572-gpio"))
		gc->get = mpc8572_gpio_get;
	else
		gc->get = mpc8xxx_gpio_get;
	gc->set = mpc8xxx_gpio_set;
	gc->to_irq = mpc8xxx_gpio_to_irq;

	ret = of_mm_gpiochip_add(np, mm_gc);
	if (ret)
		goto err;

	hwirq = irq_of_parse_and_map(np, 0);
	if (hwirq == NO_IRQ)
		goto skip_irq;

	mpc8xxx_gc->irq =
		irq_alloc_host(np, IRQ_HOST_MAP_LINEAR, MPC8XXX_GPIO_PINS,
			       &mpc8xxx_gpio_irq_ops, MPC8XXX_GPIO_PINS);
	if (!mpc8xxx_gc->irq)
		goto skip_irq;

	id = of_match_node(mpc8xxx_gpio_ids, np);
	if (id)
		mpc8xxx_gc->of_dev_id_data = id->data;

	mpc8xxx_gc->irq->host_data = mpc8xxx_gc;

	/* ack and mask all irqs */
	out_be32(mm_gc->regs + GPIO_IER, 0xffffffff);
	out_be32(mm_gc->regs + GPIO_IMR, 0);

	irq_set_handler_data(hwirq, mpc8xxx_gc);
	irq_set_chained_handler(hwirq, mpc8xxx_gpio_irq_cascade);

skip_irq:
	return;

err:
	pr_err("%s: registration failed with status %d\n",
	       np->full_name, ret);
	kfree(mpc8xxx_gc);

	return;
}

static int __init mpc8xxx_add_gpiochips(void)
{
	struct device_node *np;

	for_each_matching_node(np, mpc8xxx_gpio_ids)
		mpc8xxx_add_controller(np);

	return 0;
}
arch_initcall(mpc8xxx_add_gpiochips);