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v4.17
  1/*
  2 * arch/arm/plat-orion/gpio.c
  3 *
  4 * Marvell Orion SoC GPIO handling.
  5 *
  6 * This file is licensed under the terms of the GNU General Public
  7 * License version 2.  This program is licensed "as is" without any
  8 * warranty of any kind, whether express or implied.
  9 */
 10
 11#define DEBUG
 12
 13#include <linux/kernel.h>
 14#include <linux/init.h>
 15#include <linux/irq.h>
 16#include <linux/irqdomain.h>
 17#include <linux/module.h>
 18#include <linux/spinlock.h>
 19#include <linux/bitops.h>
 20#include <linux/io.h>
 21#include <linux/gpio.h>
 22#include <linux/leds.h>
 23#include <linux/of.h>
 24#include <linux/of_irq.h>
 25#include <linux/of_address.h>
 26#include <plat/orion-gpio.h>
 27
 28/*
 29 * GPIO unit register offsets.
 30 */
 31#define GPIO_OUT_OFF		0x0000
 32#define GPIO_IO_CONF_OFF	0x0004
 33#define GPIO_BLINK_EN_OFF	0x0008
 34#define GPIO_IN_POL_OFF		0x000c
 35#define GPIO_DATA_IN_OFF	0x0010
 36#define GPIO_EDGE_CAUSE_OFF	0x0014
 37#define GPIO_EDGE_MASK_OFF	0x0018
 38#define GPIO_LEVEL_MASK_OFF	0x001c
 39
 40struct orion_gpio_chip {
 41	struct gpio_chip	chip;
 42	spinlock_t		lock;
 43	void __iomem		*base;
 44	unsigned long		valid_input;
 45	unsigned long		valid_output;
 46	int			mask_offset;
 47	int			secondary_irq_base;
 48	struct irq_domain       *domain;
 49};
 50
 51static void __iomem *GPIO_OUT(struct orion_gpio_chip *ochip)
 52{
 53	return ochip->base + GPIO_OUT_OFF;
 54}
 55
 56static void __iomem *GPIO_IO_CONF(struct orion_gpio_chip *ochip)
 57{
 58	return ochip->base + GPIO_IO_CONF_OFF;
 59}
 60
 61static void __iomem *GPIO_BLINK_EN(struct orion_gpio_chip *ochip)
 62{
 63	return ochip->base + GPIO_BLINK_EN_OFF;
 64}
 65
 66static void __iomem *GPIO_IN_POL(struct orion_gpio_chip *ochip)
 67{
 68	return ochip->base + GPIO_IN_POL_OFF;
 69}
 70
 71static void __iomem *GPIO_DATA_IN(struct orion_gpio_chip *ochip)
 72{
 73	return ochip->base + GPIO_DATA_IN_OFF;
 74}
 75
 76static void __iomem *GPIO_EDGE_CAUSE(struct orion_gpio_chip *ochip)
 77{
 78	return ochip->base + GPIO_EDGE_CAUSE_OFF;
 79}
 80
 81static void __iomem *GPIO_EDGE_MASK(struct orion_gpio_chip *ochip)
 82{
 83	return ochip->base + ochip->mask_offset + GPIO_EDGE_MASK_OFF;
 84}
 85
 86static void __iomem *GPIO_LEVEL_MASK(struct orion_gpio_chip *ochip)
 87{
 88	return ochip->base + ochip->mask_offset + GPIO_LEVEL_MASK_OFF;
 89}
 90
 91
 92static struct orion_gpio_chip orion_gpio_chips[2];
 93static int orion_gpio_chip_count;
 94
 95static inline void
 96__set_direction(struct orion_gpio_chip *ochip, unsigned pin, int input)
 97{
 98	u32 u;
 99
100	u = readl(GPIO_IO_CONF(ochip));
101	if (input)
102		u |= 1 << pin;
103	else
104		u &= ~(1 << pin);
105	writel(u, GPIO_IO_CONF(ochip));
106}
107
108static void __set_level(struct orion_gpio_chip *ochip, unsigned pin, int high)
109{
110	u32 u;
111
112	u = readl(GPIO_OUT(ochip));
113	if (high)
114		u |= 1 << pin;
115	else
116		u &= ~(1 << pin);
117	writel(u, GPIO_OUT(ochip));
118}
119
120static inline void
121__set_blinking(struct orion_gpio_chip *ochip, unsigned pin, int blink)
122{
123	u32 u;
124
125	u = readl(GPIO_BLINK_EN(ochip));
126	if (blink)
127		u |= 1 << pin;
128	else
129		u &= ~(1 << pin);
130	writel(u, GPIO_BLINK_EN(ochip));
131}
132
133static inline int
134orion_gpio_is_valid(struct orion_gpio_chip *ochip, unsigned pin, int mode)
135{
136	if (pin >= ochip->chip.ngpio)
137		goto err_out;
138
139	if ((mode & GPIO_INPUT_OK) && !test_bit(pin, &ochip->valid_input))
140		goto err_out;
141
142	if ((mode & GPIO_OUTPUT_OK) && !test_bit(pin, &ochip->valid_output))
143		goto err_out;
144
145	return 1;
146
147err_out:
148	pr_debug("%s: invalid GPIO %d\n", __func__, pin);
149	return false;
150}
151
152/*
153 * GPIO primitives.
154 */
155static int orion_gpio_request(struct gpio_chip *chip, unsigned pin)
156{
157	struct orion_gpio_chip *ochip = gpiochip_get_data(chip);
 
158
159	if (orion_gpio_is_valid(ochip, pin, GPIO_INPUT_OK) ||
160	    orion_gpio_is_valid(ochip, pin, GPIO_OUTPUT_OK))
161		return 0;
162
163	return -EINVAL;
164}
165
166static int orion_gpio_direction_input(struct gpio_chip *chip, unsigned pin)
167{
168	struct orion_gpio_chip *ochip = gpiochip_get_data(chip);
 
169	unsigned long flags;
170
171	if (!orion_gpio_is_valid(ochip, pin, GPIO_INPUT_OK))
172		return -EINVAL;
173
174	spin_lock_irqsave(&ochip->lock, flags);
175	__set_direction(ochip, pin, 1);
176	spin_unlock_irqrestore(&ochip->lock, flags);
177
178	return 0;
179}
180
181static int orion_gpio_get(struct gpio_chip *chip, unsigned pin)
182{
183	struct orion_gpio_chip *ochip = gpiochip_get_data(chip);
 
184	int val;
185
186	if (readl(GPIO_IO_CONF(ochip)) & (1 << pin)) {
187		val = readl(GPIO_DATA_IN(ochip)) ^ readl(GPIO_IN_POL(ochip));
188	} else {
189		val = readl(GPIO_OUT(ochip));
190	}
191
192	return (val >> pin) & 1;
193}
194
195static int
196orion_gpio_direction_output(struct gpio_chip *chip, unsigned pin, int value)
197{
198	struct orion_gpio_chip *ochip = gpiochip_get_data(chip);
 
199	unsigned long flags;
200
201	if (!orion_gpio_is_valid(ochip, pin, GPIO_OUTPUT_OK))
202		return -EINVAL;
203
204	spin_lock_irqsave(&ochip->lock, flags);
205	__set_blinking(ochip, pin, 0);
206	__set_level(ochip, pin, value);
207	__set_direction(ochip, pin, 0);
208	spin_unlock_irqrestore(&ochip->lock, flags);
209
210	return 0;
211}
212
213static void orion_gpio_set(struct gpio_chip *chip, unsigned pin, int value)
214{
215	struct orion_gpio_chip *ochip = gpiochip_get_data(chip);
 
216	unsigned long flags;
217
218	spin_lock_irqsave(&ochip->lock, flags);
219	__set_level(ochip, pin, value);
220	spin_unlock_irqrestore(&ochip->lock, flags);
221}
222
223static int orion_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
224{
225	struct orion_gpio_chip *ochip = gpiochip_get_data(chip);
 
226
227	return irq_create_mapping(ochip->domain,
228				  ochip->secondary_irq_base + pin);
229}
230
231/*
232 * Orion-specific GPIO API extensions.
233 */
234static struct orion_gpio_chip *orion_gpio_chip_find(int pin)
235{
236	int i;
237
238	for (i = 0; i < orion_gpio_chip_count; i++) {
239		struct orion_gpio_chip *ochip = orion_gpio_chips + i;
240		struct gpio_chip *chip = &ochip->chip;
241
242		if (pin >= chip->base && pin < chip->base + chip->ngpio)
243			return ochip;
244	}
245
246	return NULL;
247}
248
249void __init orion_gpio_set_unused(unsigned pin)
250{
251	struct orion_gpio_chip *ochip = orion_gpio_chip_find(pin);
252
253	if (ochip == NULL)
254		return;
255
256	pin -= ochip->chip.base;
257
258	/* Configure as output, drive low. */
259	__set_level(ochip, pin, 0);
260	__set_direction(ochip, pin, 0);
261}
262
263void __init orion_gpio_set_valid(unsigned pin, int mode)
264{
265	struct orion_gpio_chip *ochip = orion_gpio_chip_find(pin);
266
267	if (ochip == NULL)
268		return;
269
270	pin -= ochip->chip.base;
271
272	if (mode == 1)
273		mode = GPIO_INPUT_OK | GPIO_OUTPUT_OK;
274
275	if (mode & GPIO_INPUT_OK)
276		__set_bit(pin, &ochip->valid_input);
277	else
278		__clear_bit(pin, &ochip->valid_input);
279
280	if (mode & GPIO_OUTPUT_OK)
281		__set_bit(pin, &ochip->valid_output);
282	else
283		__clear_bit(pin, &ochip->valid_output);
284}
285
286void orion_gpio_set_blink(unsigned pin, int blink)
287{
288	struct orion_gpio_chip *ochip = orion_gpio_chip_find(pin);
289	unsigned long flags;
290
291	if (ochip == NULL)
292		return;
293
294	spin_lock_irqsave(&ochip->lock, flags);
295	__set_level(ochip, pin & 31, 0);
296	__set_blinking(ochip, pin & 31, blink);
297	spin_unlock_irqrestore(&ochip->lock, flags);
298}
299EXPORT_SYMBOL(orion_gpio_set_blink);
300
301#define ORION_BLINK_HALF_PERIOD 100 /* ms */
302
303int orion_gpio_led_blink_set(struct gpio_desc *desc, int state,
304	unsigned long *delay_on, unsigned long *delay_off)
305{
306	unsigned gpio = desc_to_gpio(desc);
307
308	if (delay_on && delay_off && !*delay_on && !*delay_off)
309		*delay_on = *delay_off = ORION_BLINK_HALF_PERIOD;
310
311	switch (state) {
312	case GPIO_LED_NO_BLINK_LOW:
313	case GPIO_LED_NO_BLINK_HIGH:
314		orion_gpio_set_blink(gpio, 0);
315		gpio_set_value(gpio, state);
316		break;
317	case GPIO_LED_BLINK:
318		orion_gpio_set_blink(gpio, 1);
319	}
320	return 0;
321}
322EXPORT_SYMBOL_GPL(orion_gpio_led_blink_set);
323
324
325/*****************************************************************************
326 * Orion GPIO IRQ
327 *
328 * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
329 * value of the line or the opposite value.
330 *
331 * Level IRQ handlers: DATA_IN is used directly as cause register.
332 *                     Interrupt are masked by LEVEL_MASK registers.
333 * Edge IRQ handlers:  Change in DATA_IN are latched in EDGE_CAUSE.
334 *                     Interrupt are masked by EDGE_MASK registers.
335 * Both-edge handlers: Similar to regular Edge handlers, but also swaps
336 *                     the polarity to catch the next line transaction.
337 *                     This is a race condition that might not perfectly
338 *                     work on some use cases.
339 *
340 * Every eight GPIO lines are grouped (OR'ed) before going up to main
341 * cause register.
342 *
343 *                    EDGE  cause    mask
344 *        data-in   /--------| |-----| |----\
345 *     -----| |-----                         ---- to main cause reg
346 *           X      \----------------| |----/
347 *        polarity    LEVEL          mask
348 *
349 ****************************************************************************/
350
351static int gpio_irq_set_type(struct irq_data *d, u32 type)
352{
353	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
354	struct irq_chip_type *ct = irq_data_get_chip_type(d);
355	struct orion_gpio_chip *ochip = gc->private;
356	int pin;
357	u32 u;
358
359	pin = d->hwirq - ochip->secondary_irq_base;
360
361	u = readl(GPIO_IO_CONF(ochip)) & (1 << pin);
362	if (!u) {
363		return -EINVAL;
364	}
365
366	type &= IRQ_TYPE_SENSE_MASK;
367	if (type == IRQ_TYPE_NONE)
368		return -EINVAL;
369
370	/* Check if we need to change chip and handler */
371	if (!(ct->type & type))
372		if (irq_setup_alt_chip(d, type))
373			return -EINVAL;
374
375	/*
376	 * Configure interrupt polarity.
377	 */
378	if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH) {
379		u = readl(GPIO_IN_POL(ochip));
380		u &= ~(1 << pin);
381		writel(u, GPIO_IN_POL(ochip));
382	} else if (type == IRQ_TYPE_EDGE_FALLING || type == IRQ_TYPE_LEVEL_LOW) {
383		u = readl(GPIO_IN_POL(ochip));
384		u |= 1 << pin;
385		writel(u, GPIO_IN_POL(ochip));
386	} else if (type == IRQ_TYPE_EDGE_BOTH) {
387		u32 v;
388
389		v = readl(GPIO_IN_POL(ochip)) ^ readl(GPIO_DATA_IN(ochip));
390
391		/*
392		 * set initial polarity based on current input level
393		 */
394		u = readl(GPIO_IN_POL(ochip));
395		if (v & (1 << pin))
396			u |= 1 << pin;		/* falling */
397		else
398			u &= ~(1 << pin);	/* rising */
399		writel(u, GPIO_IN_POL(ochip));
400	}
401	return 0;
402}
403
404static void gpio_irq_handler(struct irq_desc *desc)
405{
406	struct orion_gpio_chip *ochip = irq_desc_get_handler_data(desc);
407	u32 cause, type;
408	int i;
409
410	if (ochip == NULL)
411		return;
412
413	cause = readl(GPIO_DATA_IN(ochip)) & readl(GPIO_LEVEL_MASK(ochip));
414	cause |= readl(GPIO_EDGE_CAUSE(ochip)) & readl(GPIO_EDGE_MASK(ochip));
415
416	for (i = 0; i < ochip->chip.ngpio; i++) {
417		int irq;
418
419		irq = ochip->secondary_irq_base + i;
420
421		if (!(cause & (1 << i)))
422			continue;
423
424		type = irq_get_trigger_type(irq);
425		if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
426			/* Swap polarity (race with GPIO line) */
427			u32 polarity;
428
429			polarity = readl(GPIO_IN_POL(ochip));
430			polarity ^= 1 << i;
431			writel(polarity, GPIO_IN_POL(ochip));
432		}
433		generic_handle_irq(irq);
434	}
435}
436
437#ifdef CONFIG_DEBUG_FS
438#include <linux/seq_file.h>
439
440static void orion_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
441{
442
443	struct orion_gpio_chip *ochip = gpiochip_get_data(chip);
444	u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk;
445	int i;
446
447	out	= readl_relaxed(GPIO_OUT(ochip));
448	io_conf	= readl_relaxed(GPIO_IO_CONF(ochip));
449	blink	= readl_relaxed(GPIO_BLINK_EN(ochip));
450	in_pol	= readl_relaxed(GPIO_IN_POL(ochip));
451	data_in	= readl_relaxed(GPIO_DATA_IN(ochip));
452	cause	= readl_relaxed(GPIO_EDGE_CAUSE(ochip));
453	edg_msk	= readl_relaxed(GPIO_EDGE_MASK(ochip));
454	lvl_msk	= readl_relaxed(GPIO_LEVEL_MASK(ochip));
455
456	for (i = 0; i < chip->ngpio; i++) {
457		const char *label;
458		u32 msk;
459		bool is_out;
460
461		label = gpiochip_is_requested(chip, i);
462		if (!label)
463			continue;
464
465		msk = 1 << i;
466		is_out = !(io_conf & msk);
467
468		seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label);
469
470		if (is_out) {
471			seq_printf(s, " out %s %s\n",
472				   out & msk ? "hi" : "lo",
473				   blink & msk ? "(blink )" : "");
474			continue;
475		}
476
477		seq_printf(s, " in  %s (act %s) - IRQ",
478			   (data_in ^ in_pol) & msk  ? "hi" : "lo",
479			   in_pol & msk ? "lo" : "hi");
480		if (!((edg_msk | lvl_msk) & msk)) {
481			seq_puts(s, " disabled\n");
482			continue;
483		}
484		if (edg_msk & msk)
485			seq_puts(s, " edge ");
486		if (lvl_msk & msk)
487			seq_puts(s, " level");
488		seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear  ");
489	}
490}
491#else
492#define orion_gpio_dbg_show NULL
493#endif
494
495static void orion_gpio_unmask_irq(struct irq_data *d)
496{
497	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
498	struct irq_chip_type *ct = irq_data_get_chip_type(d);
499	u32 reg_val;
500	u32 mask = d->mask;
501
502	irq_gc_lock(gc);
503	reg_val = irq_reg_readl(gc, ct->regs.mask);
504	reg_val |= mask;
505	irq_reg_writel(gc, reg_val, ct->regs.mask);
506	irq_gc_unlock(gc);
507}
508
509static void orion_gpio_mask_irq(struct irq_data *d)
510{
511	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
512	struct irq_chip_type *ct = irq_data_get_chip_type(d);
513	u32 mask = d->mask;
514	u32 reg_val;
515
516	irq_gc_lock(gc);
517	reg_val = irq_reg_readl(gc, ct->regs.mask);
518	reg_val &= ~mask;
519	irq_reg_writel(gc, reg_val, ct->regs.mask);
520	irq_gc_unlock(gc);
521}
522
523void __init orion_gpio_init(struct device_node *np,
524			    int gpio_base, int ngpio,
525			    void __iomem *base, int mask_offset,
526			    int secondary_irq_base,
527			    int irqs[4])
528{
529	struct orion_gpio_chip *ochip;
530	struct irq_chip_generic *gc;
531	struct irq_chip_type *ct;
532	char gc_label[16];
533	int i;
534
535	if (orion_gpio_chip_count == ARRAY_SIZE(orion_gpio_chips))
536		return;
537
538	snprintf(gc_label, sizeof(gc_label), "orion_gpio%d",
539		orion_gpio_chip_count);
540
541	ochip = orion_gpio_chips + orion_gpio_chip_count;
542	ochip->chip.label = kstrdup(gc_label, GFP_KERNEL);
543	ochip->chip.request = orion_gpio_request;
544	ochip->chip.direction_input = orion_gpio_direction_input;
545	ochip->chip.get = orion_gpio_get;
546	ochip->chip.direction_output = orion_gpio_direction_output;
547	ochip->chip.set = orion_gpio_set;
548	ochip->chip.to_irq = orion_gpio_to_irq;
549	ochip->chip.base = gpio_base;
550	ochip->chip.ngpio = ngpio;
551	ochip->chip.can_sleep = 0;
552#ifdef CONFIG_OF
553	ochip->chip.of_node = np;
554#endif
555	ochip->chip.dbg_show = orion_gpio_dbg_show;
556
557	spin_lock_init(&ochip->lock);
558	ochip->base = (void __iomem *)base;
559	ochip->valid_input = 0;
560	ochip->valid_output = 0;
561	ochip->mask_offset = mask_offset;
562	ochip->secondary_irq_base = secondary_irq_base;
563
564	gpiochip_add_data(&ochip->chip, ochip);
565
566	/*
567	 * Mask and clear GPIO interrupts.
568	 */
569	writel(0, GPIO_EDGE_CAUSE(ochip));
570	writel(0, GPIO_EDGE_MASK(ochip));
571	writel(0, GPIO_LEVEL_MASK(ochip));
572
573	/* Setup the interrupt handlers. Each chip can have up to 4
574	 * interrupt handlers, with each handler dealing with 8 GPIO
575	 * pins. */
576
577	for (i = 0; i < 4; i++) {
578		if (irqs[i]) {
579			irq_set_chained_handler_and_data(irqs[i],
580							 gpio_irq_handler,
581							 ochip);
582		}
583	}
584
585	gc = irq_alloc_generic_chip("orion_gpio_irq", 2,
586				    secondary_irq_base,
587				    ochip->base, handle_level_irq);
588	gc->private = ochip;
589	ct = gc->chip_types;
590	ct->regs.mask = ochip->mask_offset + GPIO_LEVEL_MASK_OFF;
591	ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
592	ct->chip.irq_mask = orion_gpio_mask_irq;
593	ct->chip.irq_unmask = orion_gpio_unmask_irq;
594	ct->chip.irq_set_type = gpio_irq_set_type;
595	ct->chip.name = ochip->chip.label;
596
597	ct++;
598	ct->regs.mask = ochip->mask_offset + GPIO_EDGE_MASK_OFF;
599	ct->regs.ack = GPIO_EDGE_CAUSE_OFF;
600	ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
601	ct->chip.irq_ack = irq_gc_ack_clr_bit;
602	ct->chip.irq_mask = orion_gpio_mask_irq;
603	ct->chip.irq_unmask = orion_gpio_unmask_irq;
604	ct->chip.irq_set_type = gpio_irq_set_type;
605	ct->handler = handle_edge_irq;
606	ct->chip.name = ochip->chip.label;
607
608	irq_setup_generic_chip(gc, IRQ_MSK(ngpio), IRQ_GC_INIT_MASK_CACHE,
609			       IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
610
611	/* Setup irq domain on top of the generic chip. */
612	ochip->domain = irq_domain_add_legacy(np,
613					      ochip->chip.ngpio,
614					      ochip->secondary_irq_base,
615					      ochip->secondary_irq_base,
616					      &irq_domain_simple_ops,
617					      ochip);
618	if (!ochip->domain)
619		panic("%s: couldn't allocate irq domain (DT).\n",
620		      ochip->chip.label);
621
622	orion_gpio_chip_count++;
623}
v3.15
  1/*
  2 * arch/arm/plat-orion/gpio.c
  3 *
  4 * Marvell Orion SoC GPIO handling.
  5 *
  6 * This file is licensed under the terms of the GNU General Public
  7 * License version 2.  This program is licensed "as is" without any
  8 * warranty of any kind, whether express or implied.
  9 */
 10
 11#define DEBUG
 12
 13#include <linux/kernel.h>
 14#include <linux/init.h>
 15#include <linux/irq.h>
 16#include <linux/irqdomain.h>
 17#include <linux/module.h>
 18#include <linux/spinlock.h>
 19#include <linux/bitops.h>
 20#include <linux/io.h>
 21#include <linux/gpio.h>
 22#include <linux/leds.h>
 23#include <linux/of.h>
 24#include <linux/of_irq.h>
 25#include <linux/of_address.h>
 26#include <plat/orion-gpio.h>
 27
 28/*
 29 * GPIO unit register offsets.
 30 */
 31#define GPIO_OUT_OFF		0x0000
 32#define GPIO_IO_CONF_OFF	0x0004
 33#define GPIO_BLINK_EN_OFF	0x0008
 34#define GPIO_IN_POL_OFF		0x000c
 35#define GPIO_DATA_IN_OFF	0x0010
 36#define GPIO_EDGE_CAUSE_OFF	0x0014
 37#define GPIO_EDGE_MASK_OFF	0x0018
 38#define GPIO_LEVEL_MASK_OFF	0x001c
 39
 40struct orion_gpio_chip {
 41	struct gpio_chip	chip;
 42	spinlock_t		lock;
 43	void __iomem		*base;
 44	unsigned long		valid_input;
 45	unsigned long		valid_output;
 46	int			mask_offset;
 47	int			secondary_irq_base;
 48	struct irq_domain       *domain;
 49};
 50
 51static void __iomem *GPIO_OUT(struct orion_gpio_chip *ochip)
 52{
 53	return ochip->base + GPIO_OUT_OFF;
 54}
 55
 56static void __iomem *GPIO_IO_CONF(struct orion_gpio_chip *ochip)
 57{
 58	return ochip->base + GPIO_IO_CONF_OFF;
 59}
 60
 61static void __iomem *GPIO_BLINK_EN(struct orion_gpio_chip *ochip)
 62{
 63	return ochip->base + GPIO_BLINK_EN_OFF;
 64}
 65
 66static void __iomem *GPIO_IN_POL(struct orion_gpio_chip *ochip)
 67{
 68	return ochip->base + GPIO_IN_POL_OFF;
 69}
 70
 71static void __iomem *GPIO_DATA_IN(struct orion_gpio_chip *ochip)
 72{
 73	return ochip->base + GPIO_DATA_IN_OFF;
 74}
 75
 76static void __iomem *GPIO_EDGE_CAUSE(struct orion_gpio_chip *ochip)
 77{
 78	return ochip->base + GPIO_EDGE_CAUSE_OFF;
 79}
 80
 81static void __iomem *GPIO_EDGE_MASK(struct orion_gpio_chip *ochip)
 82{
 83	return ochip->base + ochip->mask_offset + GPIO_EDGE_MASK_OFF;
 84}
 85
 86static void __iomem *GPIO_LEVEL_MASK(struct orion_gpio_chip *ochip)
 87{
 88	return ochip->base + ochip->mask_offset + GPIO_LEVEL_MASK_OFF;
 89}
 90
 91
 92static struct orion_gpio_chip orion_gpio_chips[2];
 93static int orion_gpio_chip_count;
 94
 95static inline void
 96__set_direction(struct orion_gpio_chip *ochip, unsigned pin, int input)
 97{
 98	u32 u;
 99
100	u = readl(GPIO_IO_CONF(ochip));
101	if (input)
102		u |= 1 << pin;
103	else
104		u &= ~(1 << pin);
105	writel(u, GPIO_IO_CONF(ochip));
106}
107
108static void __set_level(struct orion_gpio_chip *ochip, unsigned pin, int high)
109{
110	u32 u;
111
112	u = readl(GPIO_OUT(ochip));
113	if (high)
114		u |= 1 << pin;
115	else
116		u &= ~(1 << pin);
117	writel(u, GPIO_OUT(ochip));
118}
119
120static inline void
121__set_blinking(struct orion_gpio_chip *ochip, unsigned pin, int blink)
122{
123	u32 u;
124
125	u = readl(GPIO_BLINK_EN(ochip));
126	if (blink)
127		u |= 1 << pin;
128	else
129		u &= ~(1 << pin);
130	writel(u, GPIO_BLINK_EN(ochip));
131}
132
133static inline int
134orion_gpio_is_valid(struct orion_gpio_chip *ochip, unsigned pin, int mode)
135{
136	if (pin >= ochip->chip.ngpio)
137		goto err_out;
138
139	if ((mode & GPIO_INPUT_OK) && !test_bit(pin, &ochip->valid_input))
140		goto err_out;
141
142	if ((mode & GPIO_OUTPUT_OK) && !test_bit(pin, &ochip->valid_output))
143		goto err_out;
144
145	return 1;
146
147err_out:
148	pr_debug("%s: invalid GPIO %d\n", __func__, pin);
149	return false;
150}
151
152/*
153 * GPIO primitives.
154 */
155static int orion_gpio_request(struct gpio_chip *chip, unsigned pin)
156{
157	struct orion_gpio_chip *ochip =
158		container_of(chip, struct orion_gpio_chip, chip);
159
160	if (orion_gpio_is_valid(ochip, pin, GPIO_INPUT_OK) ||
161	    orion_gpio_is_valid(ochip, pin, GPIO_OUTPUT_OK))
162		return 0;
163
164	return -EINVAL;
165}
166
167static int orion_gpio_direction_input(struct gpio_chip *chip, unsigned pin)
168{
169	struct orion_gpio_chip *ochip =
170		container_of(chip, struct orion_gpio_chip, chip);
171	unsigned long flags;
172
173	if (!orion_gpio_is_valid(ochip, pin, GPIO_INPUT_OK))
174		return -EINVAL;
175
176	spin_lock_irqsave(&ochip->lock, flags);
177	__set_direction(ochip, pin, 1);
178	spin_unlock_irqrestore(&ochip->lock, flags);
179
180	return 0;
181}
182
183static int orion_gpio_get(struct gpio_chip *chip, unsigned pin)
184{
185	struct orion_gpio_chip *ochip =
186		container_of(chip, struct orion_gpio_chip, chip);
187	int val;
188
189	if (readl(GPIO_IO_CONF(ochip)) & (1 << pin)) {
190		val = readl(GPIO_DATA_IN(ochip)) ^ readl(GPIO_IN_POL(ochip));
191	} else {
192		val = readl(GPIO_OUT(ochip));
193	}
194
195	return (val >> pin) & 1;
196}
197
198static int
199orion_gpio_direction_output(struct gpio_chip *chip, unsigned pin, int value)
200{
201	struct orion_gpio_chip *ochip =
202		container_of(chip, struct orion_gpio_chip, chip);
203	unsigned long flags;
204
205	if (!orion_gpio_is_valid(ochip, pin, GPIO_OUTPUT_OK))
206		return -EINVAL;
207
208	spin_lock_irqsave(&ochip->lock, flags);
209	__set_blinking(ochip, pin, 0);
210	__set_level(ochip, pin, value);
211	__set_direction(ochip, pin, 0);
212	spin_unlock_irqrestore(&ochip->lock, flags);
213
214	return 0;
215}
216
217static void orion_gpio_set(struct gpio_chip *chip, unsigned pin, int value)
218{
219	struct orion_gpio_chip *ochip =
220		container_of(chip, struct orion_gpio_chip, chip);
221	unsigned long flags;
222
223	spin_lock_irqsave(&ochip->lock, flags);
224	__set_level(ochip, pin, value);
225	spin_unlock_irqrestore(&ochip->lock, flags);
226}
227
228static int orion_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
229{
230	struct orion_gpio_chip *ochip =
231		container_of(chip, struct orion_gpio_chip, chip);
232
233	return irq_create_mapping(ochip->domain,
234				  ochip->secondary_irq_base + pin);
235}
236
237/*
238 * Orion-specific GPIO API extensions.
239 */
240static struct orion_gpio_chip *orion_gpio_chip_find(int pin)
241{
242	int i;
243
244	for (i = 0; i < orion_gpio_chip_count; i++) {
245		struct orion_gpio_chip *ochip = orion_gpio_chips + i;
246		struct gpio_chip *chip = &ochip->chip;
247
248		if (pin >= chip->base && pin < chip->base + chip->ngpio)
249			return ochip;
250	}
251
252	return NULL;
253}
254
255void __init orion_gpio_set_unused(unsigned pin)
256{
257	struct orion_gpio_chip *ochip = orion_gpio_chip_find(pin);
258
259	if (ochip == NULL)
260		return;
261
262	pin -= ochip->chip.base;
263
264	/* Configure as output, drive low. */
265	__set_level(ochip, pin, 0);
266	__set_direction(ochip, pin, 0);
267}
268
269void __init orion_gpio_set_valid(unsigned pin, int mode)
270{
271	struct orion_gpio_chip *ochip = orion_gpio_chip_find(pin);
272
273	if (ochip == NULL)
274		return;
275
276	pin -= ochip->chip.base;
277
278	if (mode == 1)
279		mode = GPIO_INPUT_OK | GPIO_OUTPUT_OK;
280
281	if (mode & GPIO_INPUT_OK)
282		__set_bit(pin, &ochip->valid_input);
283	else
284		__clear_bit(pin, &ochip->valid_input);
285
286	if (mode & GPIO_OUTPUT_OK)
287		__set_bit(pin, &ochip->valid_output);
288	else
289		__clear_bit(pin, &ochip->valid_output);
290}
291
292void orion_gpio_set_blink(unsigned pin, int blink)
293{
294	struct orion_gpio_chip *ochip = orion_gpio_chip_find(pin);
295	unsigned long flags;
296
297	if (ochip == NULL)
298		return;
299
300	spin_lock_irqsave(&ochip->lock, flags);
301	__set_level(ochip, pin & 31, 0);
302	__set_blinking(ochip, pin & 31, blink);
303	spin_unlock_irqrestore(&ochip->lock, flags);
304}
305EXPORT_SYMBOL(orion_gpio_set_blink);
306
307#define ORION_BLINK_HALF_PERIOD 100 /* ms */
308
309int orion_gpio_led_blink_set(unsigned gpio, int state,
310	unsigned long *delay_on, unsigned long *delay_off)
311{
 
312
313	if (delay_on && delay_off && !*delay_on && !*delay_off)
314		*delay_on = *delay_off = ORION_BLINK_HALF_PERIOD;
315
316	switch (state) {
317	case GPIO_LED_NO_BLINK_LOW:
318	case GPIO_LED_NO_BLINK_HIGH:
319		orion_gpio_set_blink(gpio, 0);
320		gpio_set_value(gpio, state);
321		break;
322	case GPIO_LED_BLINK:
323		orion_gpio_set_blink(gpio, 1);
324	}
325	return 0;
326}
327EXPORT_SYMBOL_GPL(orion_gpio_led_blink_set);
328
329
330/*****************************************************************************
331 * Orion GPIO IRQ
332 *
333 * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
334 * value of the line or the opposite value.
335 *
336 * Level IRQ handlers: DATA_IN is used directly as cause register.
337 *                     Interrupt are masked by LEVEL_MASK registers.
338 * Edge IRQ handlers:  Change in DATA_IN are latched in EDGE_CAUSE.
339 *                     Interrupt are masked by EDGE_MASK registers.
340 * Both-edge handlers: Similar to regular Edge handlers, but also swaps
341 *                     the polarity to catch the next line transaction.
342 *                     This is a race condition that might not perfectly
343 *                     work on some use cases.
344 *
345 * Every eight GPIO lines are grouped (OR'ed) before going up to main
346 * cause register.
347 *
348 *                    EDGE  cause    mask
349 *        data-in   /--------| |-----| |----\
350 *     -----| |-----                         ---- to main cause reg
351 *           X      \----------------| |----/
352 *        polarity    LEVEL          mask
353 *
354 ****************************************************************************/
355
356static int gpio_irq_set_type(struct irq_data *d, u32 type)
357{
358	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
359	struct irq_chip_type *ct = irq_data_get_chip_type(d);
360	struct orion_gpio_chip *ochip = gc->private;
361	int pin;
362	u32 u;
363
364	pin = d->hwirq - ochip->secondary_irq_base;
365
366	u = readl(GPIO_IO_CONF(ochip)) & (1 << pin);
367	if (!u) {
368		return -EINVAL;
369	}
370
371	type &= IRQ_TYPE_SENSE_MASK;
372	if (type == IRQ_TYPE_NONE)
373		return -EINVAL;
374
375	/* Check if we need to change chip and handler */
376	if (!(ct->type & type))
377		if (irq_setup_alt_chip(d, type))
378			return -EINVAL;
379
380	/*
381	 * Configure interrupt polarity.
382	 */
383	if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH) {
384		u = readl(GPIO_IN_POL(ochip));
385		u &= ~(1 << pin);
386		writel(u, GPIO_IN_POL(ochip));
387	} else if (type == IRQ_TYPE_EDGE_FALLING || type == IRQ_TYPE_LEVEL_LOW) {
388		u = readl(GPIO_IN_POL(ochip));
389		u |= 1 << pin;
390		writel(u, GPIO_IN_POL(ochip));
391	} else if (type == IRQ_TYPE_EDGE_BOTH) {
392		u32 v;
393
394		v = readl(GPIO_IN_POL(ochip)) ^ readl(GPIO_DATA_IN(ochip));
395
396		/*
397		 * set initial polarity based on current input level
398		 */
399		u = readl(GPIO_IN_POL(ochip));
400		if (v & (1 << pin))
401			u |= 1 << pin;		/* falling */
402		else
403			u &= ~(1 << pin);	/* rising */
404		writel(u, GPIO_IN_POL(ochip));
405	}
406	return 0;
407}
408
409static void gpio_irq_handler(unsigned irq, struct irq_desc *desc)
410{
411	struct orion_gpio_chip *ochip = irq_get_handler_data(irq);
412	u32 cause, type;
413	int i;
414
415	if (ochip == NULL)
416		return;
417
418	cause = readl(GPIO_DATA_IN(ochip)) & readl(GPIO_LEVEL_MASK(ochip));
419	cause |= readl(GPIO_EDGE_CAUSE(ochip)) & readl(GPIO_EDGE_MASK(ochip));
420
421	for (i = 0; i < ochip->chip.ngpio; i++) {
422		int irq;
423
424		irq = ochip->secondary_irq_base + i;
425
426		if (!(cause & (1 << i)))
427			continue;
428
429		type = irq_get_trigger_type(irq);
430		if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
431			/* Swap polarity (race with GPIO line) */
432			u32 polarity;
433
434			polarity = readl(GPIO_IN_POL(ochip));
435			polarity ^= 1 << i;
436			writel(polarity, GPIO_IN_POL(ochip));
437		}
438		generic_handle_irq(irq);
439	}
440}
441
442#ifdef CONFIG_DEBUG_FS
443#include <linux/seq_file.h>
444
445static void orion_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
446{
447	struct orion_gpio_chip *ochip =
448		container_of(chip, struct orion_gpio_chip, chip);
449	u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk;
450	int i;
451
452	out	= readl_relaxed(GPIO_OUT(ochip));
453	io_conf	= readl_relaxed(GPIO_IO_CONF(ochip));
454	blink	= readl_relaxed(GPIO_BLINK_EN(ochip));
455	in_pol	= readl_relaxed(GPIO_IN_POL(ochip));
456	data_in	= readl_relaxed(GPIO_DATA_IN(ochip));
457	cause	= readl_relaxed(GPIO_EDGE_CAUSE(ochip));
458	edg_msk	= readl_relaxed(GPIO_EDGE_MASK(ochip));
459	lvl_msk	= readl_relaxed(GPIO_LEVEL_MASK(ochip));
460
461	for (i = 0; i < chip->ngpio; i++) {
462		const char *label;
463		u32 msk;
464		bool is_out;
465
466		label = gpiochip_is_requested(chip, i);
467		if (!label)
468			continue;
469
470		msk = 1 << i;
471		is_out = !(io_conf & msk);
472
473		seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label);
474
475		if (is_out) {
476			seq_printf(s, " out %s %s\n",
477				   out & msk ? "hi" : "lo",
478				   blink & msk ? "(blink )" : "");
479			continue;
480		}
481
482		seq_printf(s, " in  %s (act %s) - IRQ",
483			   (data_in ^ in_pol) & msk  ? "hi" : "lo",
484			   in_pol & msk ? "lo" : "hi");
485		if (!((edg_msk | lvl_msk) & msk)) {
486			seq_printf(s, " disabled\n");
487			continue;
488		}
489		if (edg_msk & msk)
490			seq_printf(s, " edge ");
491		if (lvl_msk & msk)
492			seq_printf(s, " level");
493		seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear  ");
494	}
495}
496#else
497#define orion_gpio_dbg_show NULL
498#endif
499
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
500void __init orion_gpio_init(struct device_node *np,
501			    int gpio_base, int ngpio,
502			    void __iomem *base, int mask_offset,
503			    int secondary_irq_base,
504			    int irqs[4])
505{
506	struct orion_gpio_chip *ochip;
507	struct irq_chip_generic *gc;
508	struct irq_chip_type *ct;
509	char gc_label[16];
510	int i;
511
512	if (orion_gpio_chip_count == ARRAY_SIZE(orion_gpio_chips))
513		return;
514
515	snprintf(gc_label, sizeof(gc_label), "orion_gpio%d",
516		orion_gpio_chip_count);
517
518	ochip = orion_gpio_chips + orion_gpio_chip_count;
519	ochip->chip.label = kstrdup(gc_label, GFP_KERNEL);
520	ochip->chip.request = orion_gpio_request;
521	ochip->chip.direction_input = orion_gpio_direction_input;
522	ochip->chip.get = orion_gpio_get;
523	ochip->chip.direction_output = orion_gpio_direction_output;
524	ochip->chip.set = orion_gpio_set;
525	ochip->chip.to_irq = orion_gpio_to_irq;
526	ochip->chip.base = gpio_base;
527	ochip->chip.ngpio = ngpio;
528	ochip->chip.can_sleep = 0;
529#ifdef CONFIG_OF
530	ochip->chip.of_node = np;
531#endif
532	ochip->chip.dbg_show = orion_gpio_dbg_show;
533
534	spin_lock_init(&ochip->lock);
535	ochip->base = (void __iomem *)base;
536	ochip->valid_input = 0;
537	ochip->valid_output = 0;
538	ochip->mask_offset = mask_offset;
539	ochip->secondary_irq_base = secondary_irq_base;
540
541	gpiochip_add(&ochip->chip);
542
543	/*
544	 * Mask and clear GPIO interrupts.
545	 */
546	writel(0, GPIO_EDGE_CAUSE(ochip));
547	writel(0, GPIO_EDGE_MASK(ochip));
548	writel(0, GPIO_LEVEL_MASK(ochip));
549
550	/* Setup the interrupt handlers. Each chip can have up to 4
551	 * interrupt handlers, with each handler dealing with 8 GPIO
552	 * pins. */
553
554	for (i = 0; i < 4; i++) {
555		if (irqs[i]) {
556			irq_set_handler_data(irqs[i], ochip);
557			irq_set_chained_handler(irqs[i], gpio_irq_handler);
 
558		}
559	}
560
561	gc = irq_alloc_generic_chip("orion_gpio_irq", 2,
562				    secondary_irq_base,
563				    ochip->base, handle_level_irq);
564	gc->private = ochip;
565	ct = gc->chip_types;
566	ct->regs.mask = ochip->mask_offset + GPIO_LEVEL_MASK_OFF;
567	ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
568	ct->chip.irq_mask = irq_gc_mask_clr_bit;
569	ct->chip.irq_unmask = irq_gc_mask_set_bit;
570	ct->chip.irq_set_type = gpio_irq_set_type;
571	ct->chip.name = ochip->chip.label;
572
573	ct++;
574	ct->regs.mask = ochip->mask_offset + GPIO_EDGE_MASK_OFF;
575	ct->regs.ack = GPIO_EDGE_CAUSE_OFF;
576	ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
577	ct->chip.irq_ack = irq_gc_ack_clr_bit;
578	ct->chip.irq_mask = irq_gc_mask_clr_bit;
579	ct->chip.irq_unmask = irq_gc_mask_set_bit;
580	ct->chip.irq_set_type = gpio_irq_set_type;
581	ct->handler = handle_edge_irq;
582	ct->chip.name = ochip->chip.label;
583
584	irq_setup_generic_chip(gc, IRQ_MSK(ngpio), IRQ_GC_INIT_MASK_CACHE,
585			       IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
586
587	/* Setup irq domain on top of the generic chip. */
588	ochip->domain = irq_domain_add_legacy(np,
589					      ochip->chip.ngpio,
590					      ochip->secondary_irq_base,
591					      ochip->secondary_irq_base,
592					      &irq_domain_simple_ops,
593					      ochip);
594	if (!ochip->domain)
595		panic("%s: couldn't allocate irq domain (DT).\n",
596		      ochip->chip.label);
597
598	orion_gpio_chip_count++;
599}
600
601#ifdef CONFIG_OF
602static void __init orion_gpio_of_init_one(struct device_node *np,
603					  int irq_gpio_base)
604{
605	int ngpio, gpio_base, mask_offset;
606	void __iomem *base;
607	int ret, i;
608	int irqs[4];
609	int secondary_irq_base;
610
611	ret = of_property_read_u32(np, "ngpio", &ngpio);
612	if (ret)
613		goto out;
614	ret = of_property_read_u32(np, "mask-offset", &mask_offset);
615	if (ret == -EINVAL)
616		mask_offset = 0;
617	else
618		goto out;
619	base = of_iomap(np, 0);
620	if (!base)
621		goto out;
622
623	secondary_irq_base = irq_gpio_base + (32 * orion_gpio_chip_count);
624	gpio_base = 32 * orion_gpio_chip_count;
625
626	/* Get the interrupt numbers. Each chip can have up to 4
627	 * interrupt handlers, with each handler dealing with 8 GPIO
628	 * pins. */
629
630	for (i = 0; i < 4; i++)
631		irqs[i] = irq_of_parse_and_map(np, i);
632
633	orion_gpio_init(np, gpio_base, ngpio, base, mask_offset,
634			secondary_irq_base, irqs);
635	return;
636out:
637	pr_err("%s: %s: missing mandatory property\n", __func__, np->name);
638}
639
640void __init orion_gpio_of_init(int irq_gpio_base)
641{
642	struct device_node *np;
643
644	for_each_compatible_node(np, NULL, "marvell,orion-gpio")
645		orion_gpio_of_init_one(np, irq_gpio_base);
646}
647#endif