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fefe7b09 TP |
1 | /* |
2 | * GPIO driver for Marvell SoCs | |
3 | * | |
4 | * Copyright (C) 2012 Marvell | |
5 | * | |
6 | * Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | |
7 | * Andrew Lunn <andrew@lunn.ch> | |
8 | * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> | |
9 | * | |
10 | * This file is licensed under the terms of the GNU General Public | |
11 | * License version 2. This program is licensed "as is" without any | |
12 | * warranty of any kind, whether express or implied. | |
13 | * | |
14 | * This driver is a fairly straightforward GPIO driver for the | |
15 | * complete family of Marvell EBU SoC platforms (Orion, Dove, | |
16 | * Kirkwood, Discovery, Armada 370/XP). The only complexity of this | |
17 | * driver is the different register layout that exists between the | |
18 | * non-SMP platforms (Orion, Dove, Kirkwood, Armada 370) and the SMP | |
19 | * platforms (MV78200 from the Discovery family and the Armada | |
20 | * XP). Therefore, this driver handles three variants of the GPIO | |
21 | * block: | |
22 | * - the basic variant, called "orion-gpio", with the simplest | |
23 | * register set. Used on Orion, Dove, Kirkwoord, Armada 370 and | |
24 | * non-SMP Discovery systems | |
25 | * - the mv78200 variant for MV78200 Discovery systems. This variant | |
26 | * turns the edge mask and level mask registers into CPU0 edge | |
27 | * mask/level mask registers, and adds CPU1 edge mask/level mask | |
28 | * registers. | |
29 | * - the armadaxp variant for Armada XP systems. This variant keeps | |
30 | * the normal cause/edge mask/level mask registers when the global | |
31 | * interrupts are used, but adds per-CPU cause/edge mask/level mask | |
32 | * registers n a separate memory area for the per-CPU GPIO | |
33 | * interrupts. | |
34 | */ | |
35 | ||
641d0342 | 36 | #include <linux/err.h> |
fefe7b09 TP |
37 | #include <linux/module.h> |
38 | #include <linux/gpio.h> | |
39 | #include <linux/irq.h> | |
40 | #include <linux/slab.h> | |
41 | #include <linux/irqdomain.h> | |
42 | #include <linux/io.h> | |
43 | #include <linux/of_irq.h> | |
44 | #include <linux/of_device.h> | |
de88747f | 45 | #include <linux/clk.h> |
fefe7b09 | 46 | #include <linux/pinctrl/consumer.h> |
01ca59f1 | 47 | #include <linux/irqchip/chained_irq.h> |
fefe7b09 TP |
48 | |
49 | /* | |
50 | * GPIO unit register offsets. | |
51 | */ | |
52 | #define GPIO_OUT_OFF 0x0000 | |
53 | #define GPIO_IO_CONF_OFF 0x0004 | |
54 | #define GPIO_BLINK_EN_OFF 0x0008 | |
55 | #define GPIO_IN_POL_OFF 0x000c | |
56 | #define GPIO_DATA_IN_OFF 0x0010 | |
57 | #define GPIO_EDGE_CAUSE_OFF 0x0014 | |
58 | #define GPIO_EDGE_MASK_OFF 0x0018 | |
59 | #define GPIO_LEVEL_MASK_OFF 0x001c | |
60 | ||
61 | /* The MV78200 has per-CPU registers for edge mask and level mask */ | |
a4319a61 | 62 | #define GPIO_EDGE_MASK_MV78200_OFF(cpu) ((cpu) ? 0x30 : 0x18) |
fefe7b09 TP |
63 | #define GPIO_LEVEL_MASK_MV78200_OFF(cpu) ((cpu) ? 0x34 : 0x1C) |
64 | ||
65 | /* The Armada XP has per-CPU registers for interrupt cause, interrupt | |
66 | * mask and interrupt level mask. Those are relative to the | |
67 | * percpu_membase. */ | |
68 | #define GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu) ((cpu) * 0x4) | |
69 | #define GPIO_EDGE_MASK_ARMADAXP_OFF(cpu) (0x10 + (cpu) * 0x4) | |
70 | #define GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu) (0x20 + (cpu) * 0x4) | |
71 | ||
a4319a61 AL |
72 | #define MVEBU_GPIO_SOC_VARIANT_ORION 0x1 |
73 | #define MVEBU_GPIO_SOC_VARIANT_MV78200 0x2 | |
fefe7b09 TP |
74 | #define MVEBU_GPIO_SOC_VARIANT_ARMADAXP 0x3 |
75 | ||
a4319a61 | 76 | #define MVEBU_MAX_GPIO_PER_BANK 32 |
fefe7b09 TP |
77 | |
78 | struct mvebu_gpio_chip { | |
79 | struct gpio_chip chip; | |
80 | spinlock_t lock; | |
81 | void __iomem *membase; | |
82 | void __iomem *percpu_membase; | |
d5359226 | 83 | int irqbase; |
fefe7b09 | 84 | struct irq_domain *domain; |
a4319a61 | 85 | int soc_variant; |
b5b7b487 | 86 | |
a4319a61 | 87 | /* Used to preserve GPIO registers across suspend/resume */ |
b5b7b487 TP |
88 | u32 out_reg; |
89 | u32 io_conf_reg; | |
90 | u32 blink_en_reg; | |
91 | u32 in_pol_reg; | |
92 | u32 edge_mask_regs[4]; | |
93 | u32 level_mask_regs[4]; | |
fefe7b09 TP |
94 | }; |
95 | ||
96 | /* | |
97 | * Functions returning addresses of individual registers for a given | |
98 | * GPIO controller. | |
99 | */ | |
100 | static inline void __iomem *mvebu_gpioreg_out(struct mvebu_gpio_chip *mvchip) | |
101 | { | |
102 | return mvchip->membase + GPIO_OUT_OFF; | |
103 | } | |
104 | ||
e9133760 JL |
105 | static inline void __iomem *mvebu_gpioreg_blink(struct mvebu_gpio_chip *mvchip) |
106 | { | |
107 | return mvchip->membase + GPIO_BLINK_EN_OFF; | |
108 | } | |
109 | ||
a4319a61 AL |
110 | static inline void __iomem * |
111 | mvebu_gpioreg_io_conf(struct mvebu_gpio_chip *mvchip) | |
fefe7b09 TP |
112 | { |
113 | return mvchip->membase + GPIO_IO_CONF_OFF; | |
114 | } | |
115 | ||
116 | static inline void __iomem *mvebu_gpioreg_in_pol(struct mvebu_gpio_chip *mvchip) | |
117 | { | |
118 | return mvchip->membase + GPIO_IN_POL_OFF; | |
119 | } | |
120 | ||
a4319a61 AL |
121 | static inline void __iomem * |
122 | mvebu_gpioreg_data_in(struct mvebu_gpio_chip *mvchip) | |
fefe7b09 TP |
123 | { |
124 | return mvchip->membase + GPIO_DATA_IN_OFF; | |
125 | } | |
126 | ||
a4319a61 AL |
127 | static inline void __iomem * |
128 | mvebu_gpioreg_edge_cause(struct mvebu_gpio_chip *mvchip) | |
fefe7b09 TP |
129 | { |
130 | int cpu; | |
131 | ||
f4dcd2d9 | 132 | switch (mvchip->soc_variant) { |
fefe7b09 TP |
133 | case MVEBU_GPIO_SOC_VARIANT_ORION: |
134 | case MVEBU_GPIO_SOC_VARIANT_MV78200: | |
135 | return mvchip->membase + GPIO_EDGE_CAUSE_OFF; | |
136 | case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: | |
137 | cpu = smp_processor_id(); | |
a4319a61 AL |
138 | return mvchip->percpu_membase + |
139 | GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu); | |
fefe7b09 TP |
140 | default: |
141 | BUG(); | |
142 | } | |
143 | } | |
144 | ||
a4319a61 AL |
145 | static inline void __iomem * |
146 | mvebu_gpioreg_edge_mask(struct mvebu_gpio_chip *mvchip) | |
fefe7b09 TP |
147 | { |
148 | int cpu; | |
149 | ||
f4dcd2d9 | 150 | switch (mvchip->soc_variant) { |
fefe7b09 TP |
151 | case MVEBU_GPIO_SOC_VARIANT_ORION: |
152 | return mvchip->membase + GPIO_EDGE_MASK_OFF; | |
153 | case MVEBU_GPIO_SOC_VARIANT_MV78200: | |
154 | cpu = smp_processor_id(); | |
155 | return mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(cpu); | |
156 | case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: | |
157 | cpu = smp_processor_id(); | |
a4319a61 AL |
158 | return mvchip->percpu_membase + |
159 | GPIO_EDGE_MASK_ARMADAXP_OFF(cpu); | |
fefe7b09 TP |
160 | default: |
161 | BUG(); | |
162 | } | |
163 | } | |
164 | ||
165 | static void __iomem *mvebu_gpioreg_level_mask(struct mvebu_gpio_chip *mvchip) | |
166 | { | |
167 | int cpu; | |
168 | ||
f4dcd2d9 | 169 | switch (mvchip->soc_variant) { |
fefe7b09 TP |
170 | case MVEBU_GPIO_SOC_VARIANT_ORION: |
171 | return mvchip->membase + GPIO_LEVEL_MASK_OFF; | |
172 | case MVEBU_GPIO_SOC_VARIANT_MV78200: | |
173 | cpu = smp_processor_id(); | |
174 | return mvchip->membase + GPIO_LEVEL_MASK_MV78200_OFF(cpu); | |
175 | case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: | |
176 | cpu = smp_processor_id(); | |
a4319a61 AL |
177 | return mvchip->percpu_membase + |
178 | GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu); | |
fefe7b09 TP |
179 | default: |
180 | BUG(); | |
181 | } | |
182 | } | |
183 | ||
184 | /* | |
185 | * Functions implementing the gpio_chip methods | |
186 | */ | |
187 | ||
fefe7b09 TP |
188 | static void mvebu_gpio_set(struct gpio_chip *chip, unsigned pin, int value) |
189 | { | |
190 | struct mvebu_gpio_chip *mvchip = | |
191 | container_of(chip, struct mvebu_gpio_chip, chip); | |
192 | unsigned long flags; | |
193 | u32 u; | |
194 | ||
195 | spin_lock_irqsave(&mvchip->lock, flags); | |
196 | u = readl_relaxed(mvebu_gpioreg_out(mvchip)); | |
197 | if (value) | |
198 | u |= 1 << pin; | |
199 | else | |
200 | u &= ~(1 << pin); | |
201 | writel_relaxed(u, mvebu_gpioreg_out(mvchip)); | |
202 | spin_unlock_irqrestore(&mvchip->lock, flags); | |
203 | } | |
204 | ||
205 | static int mvebu_gpio_get(struct gpio_chip *chip, unsigned pin) | |
206 | { | |
207 | struct mvebu_gpio_chip *mvchip = | |
208 | container_of(chip, struct mvebu_gpio_chip, chip); | |
209 | u32 u; | |
210 | ||
211 | if (readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin)) { | |
212 | u = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) ^ | |
213 | readl_relaxed(mvebu_gpioreg_in_pol(mvchip)); | |
214 | } else { | |
215 | u = readl_relaxed(mvebu_gpioreg_out(mvchip)); | |
216 | } | |
217 | ||
218 | return (u >> pin) & 1; | |
219 | } | |
220 | ||
e9133760 JL |
221 | static void mvebu_gpio_blink(struct gpio_chip *chip, unsigned pin, int value) |
222 | { | |
223 | struct mvebu_gpio_chip *mvchip = | |
224 | container_of(chip, struct mvebu_gpio_chip, chip); | |
225 | unsigned long flags; | |
226 | u32 u; | |
227 | ||
228 | spin_lock_irqsave(&mvchip->lock, flags); | |
229 | u = readl_relaxed(mvebu_gpioreg_blink(mvchip)); | |
230 | if (value) | |
231 | u |= 1 << pin; | |
232 | else | |
233 | u &= ~(1 << pin); | |
234 | writel_relaxed(u, mvebu_gpioreg_blink(mvchip)); | |
235 | spin_unlock_irqrestore(&mvchip->lock, flags); | |
236 | } | |
237 | ||
fefe7b09 TP |
238 | static int mvebu_gpio_direction_input(struct gpio_chip *chip, unsigned pin) |
239 | { | |
240 | struct mvebu_gpio_chip *mvchip = | |
241 | container_of(chip, struct mvebu_gpio_chip, chip); | |
242 | unsigned long flags; | |
243 | int ret; | |
244 | u32 u; | |
245 | ||
246 | /* Check with the pinctrl driver whether this pin is usable as | |
247 | * an input GPIO */ | |
248 | ret = pinctrl_gpio_direction_input(chip->base + pin); | |
249 | if (ret) | |
250 | return ret; | |
251 | ||
252 | spin_lock_irqsave(&mvchip->lock, flags); | |
253 | u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)); | |
254 | u |= 1 << pin; | |
255 | writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip)); | |
256 | spin_unlock_irqrestore(&mvchip->lock, flags); | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned pin, | |
262 | int value) | |
263 | { | |
264 | struct mvebu_gpio_chip *mvchip = | |
265 | container_of(chip, struct mvebu_gpio_chip, chip); | |
266 | unsigned long flags; | |
267 | int ret; | |
268 | u32 u; | |
269 | ||
270 | /* Check with the pinctrl driver whether this pin is usable as | |
271 | * an output GPIO */ | |
272 | ret = pinctrl_gpio_direction_output(chip->base + pin); | |
273 | if (ret) | |
274 | return ret; | |
275 | ||
e9133760 | 276 | mvebu_gpio_blink(chip, pin, 0); |
c57d75c0 TP |
277 | mvebu_gpio_set(chip, pin, value); |
278 | ||
fefe7b09 TP |
279 | spin_lock_irqsave(&mvchip->lock, flags); |
280 | u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)); | |
281 | u &= ~(1 << pin); | |
282 | writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip)); | |
283 | spin_unlock_irqrestore(&mvchip->lock, flags); | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
288 | static int mvebu_gpio_to_irq(struct gpio_chip *chip, unsigned pin) | |
289 | { | |
290 | struct mvebu_gpio_chip *mvchip = | |
291 | container_of(chip, struct mvebu_gpio_chip, chip); | |
292 | return irq_create_mapping(mvchip->domain, pin); | |
293 | } | |
294 | ||
295 | /* | |
296 | * Functions implementing the irq_chip methods | |
297 | */ | |
298 | static void mvebu_gpio_irq_ack(struct irq_data *d) | |
299 | { | |
300 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); | |
301 | struct mvebu_gpio_chip *mvchip = gc->private; | |
302 | u32 mask = ~(1 << (d->irq - gc->irq_base)); | |
303 | ||
304 | irq_gc_lock(gc); | |
305 | writel_relaxed(mask, mvebu_gpioreg_edge_cause(mvchip)); | |
306 | irq_gc_unlock(gc); | |
307 | } | |
308 | ||
309 | static void mvebu_gpio_edge_irq_mask(struct irq_data *d) | |
310 | { | |
311 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); | |
312 | struct mvebu_gpio_chip *mvchip = gc->private; | |
61819549 | 313 | struct irq_chip_type *ct = irq_data_get_chip_type(d); |
fefe7b09 TP |
314 | u32 mask = 1 << (d->irq - gc->irq_base); |
315 | ||
316 | irq_gc_lock(gc); | |
61819549 GC |
317 | ct->mask_cache_priv &= ~mask; |
318 | ||
319 | writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_edge_mask(mvchip)); | |
fefe7b09 TP |
320 | irq_gc_unlock(gc); |
321 | } | |
322 | ||
323 | static void mvebu_gpio_edge_irq_unmask(struct irq_data *d) | |
324 | { | |
325 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); | |
326 | struct mvebu_gpio_chip *mvchip = gc->private; | |
61819549 GC |
327 | struct irq_chip_type *ct = irq_data_get_chip_type(d); |
328 | ||
fefe7b09 TP |
329 | u32 mask = 1 << (d->irq - gc->irq_base); |
330 | ||
331 | irq_gc_lock(gc); | |
61819549 GC |
332 | ct->mask_cache_priv |= mask; |
333 | writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_edge_mask(mvchip)); | |
fefe7b09 TP |
334 | irq_gc_unlock(gc); |
335 | } | |
336 | ||
337 | static void mvebu_gpio_level_irq_mask(struct irq_data *d) | |
338 | { | |
339 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); | |
340 | struct mvebu_gpio_chip *mvchip = gc->private; | |
61819549 GC |
341 | struct irq_chip_type *ct = irq_data_get_chip_type(d); |
342 | ||
fefe7b09 TP |
343 | u32 mask = 1 << (d->irq - gc->irq_base); |
344 | ||
345 | irq_gc_lock(gc); | |
61819549 GC |
346 | ct->mask_cache_priv &= ~mask; |
347 | writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_level_mask(mvchip)); | |
fefe7b09 TP |
348 | irq_gc_unlock(gc); |
349 | } | |
350 | ||
351 | static void mvebu_gpio_level_irq_unmask(struct irq_data *d) | |
352 | { | |
353 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); | |
354 | struct mvebu_gpio_chip *mvchip = gc->private; | |
61819549 GC |
355 | struct irq_chip_type *ct = irq_data_get_chip_type(d); |
356 | ||
fefe7b09 TP |
357 | u32 mask = 1 << (d->irq - gc->irq_base); |
358 | ||
359 | irq_gc_lock(gc); | |
61819549 GC |
360 | ct->mask_cache_priv |= mask; |
361 | writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_level_mask(mvchip)); | |
fefe7b09 TP |
362 | irq_gc_unlock(gc); |
363 | } | |
364 | ||
365 | /***************************************************************************** | |
366 | * MVEBU GPIO IRQ | |
367 | * | |
368 | * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same | |
369 | * value of the line or the opposite value. | |
370 | * | |
371 | * Level IRQ handlers: DATA_IN is used directly as cause register. | |
a4319a61 | 372 | * Interrupt are masked by LEVEL_MASK registers. |
fefe7b09 | 373 | * Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE. |
a4319a61 | 374 | * Interrupt are masked by EDGE_MASK registers. |
fefe7b09 | 375 | * Both-edge handlers: Similar to regular Edge handlers, but also swaps |
a4319a61 AL |
376 | * the polarity to catch the next line transaction. |
377 | * This is a race condition that might not perfectly | |
378 | * work on some use cases. | |
fefe7b09 TP |
379 | * |
380 | * Every eight GPIO lines are grouped (OR'ed) before going up to main | |
381 | * cause register. | |
382 | * | |
a4319a61 AL |
383 | * EDGE cause mask |
384 | * data-in /--------| |-----| |----\ | |
385 | * -----| |----- ---- to main cause reg | |
386 | * X \----------------| |----/ | |
387 | * polarity LEVEL mask | |
fefe7b09 TP |
388 | * |
389 | ****************************************************************************/ | |
390 | ||
391 | static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type) | |
392 | { | |
393 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); | |
394 | struct irq_chip_type *ct = irq_data_get_chip_type(d); | |
395 | struct mvebu_gpio_chip *mvchip = gc->private; | |
396 | int pin; | |
397 | u32 u; | |
398 | ||
399 | pin = d->hwirq; | |
400 | ||
401 | u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin); | |
a4319a61 | 402 | if (!u) |
fefe7b09 | 403 | return -EINVAL; |
fefe7b09 TP |
404 | |
405 | type &= IRQ_TYPE_SENSE_MASK; | |
406 | if (type == IRQ_TYPE_NONE) | |
407 | return -EINVAL; | |
408 | ||
409 | /* Check if we need to change chip and handler */ | |
410 | if (!(ct->type & type)) | |
411 | if (irq_setup_alt_chip(d, type)) | |
412 | return -EINVAL; | |
413 | ||
414 | /* | |
415 | * Configure interrupt polarity. | |
416 | */ | |
f4dcd2d9 | 417 | switch (type) { |
fefe7b09 TP |
418 | case IRQ_TYPE_EDGE_RISING: |
419 | case IRQ_TYPE_LEVEL_HIGH: | |
420 | u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)); | |
421 | u &= ~(1 << pin); | |
422 | writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip)); | |
7cf8c9f7 | 423 | break; |
fefe7b09 TP |
424 | case IRQ_TYPE_EDGE_FALLING: |
425 | case IRQ_TYPE_LEVEL_LOW: | |
426 | u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)); | |
427 | u |= 1 << pin; | |
428 | writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip)); | |
7cf8c9f7 | 429 | break; |
fefe7b09 TP |
430 | case IRQ_TYPE_EDGE_BOTH: { |
431 | u32 v; | |
432 | ||
433 | v = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)) ^ | |
434 | readl_relaxed(mvebu_gpioreg_data_in(mvchip)); | |
435 | ||
436 | /* | |
437 | * set initial polarity based on current input level | |
438 | */ | |
439 | u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)); | |
440 | if (v & (1 << pin)) | |
441 | u |= 1 << pin; /* falling */ | |
442 | else | |
443 | u &= ~(1 << pin); /* rising */ | |
444 | writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip)); | |
7cf8c9f7 | 445 | break; |
fefe7b09 TP |
446 | } |
447 | } | |
448 | return 0; | |
449 | } | |
450 | ||
bd0b9ac4 | 451 | static void mvebu_gpio_irq_handler(struct irq_desc *desc) |
fefe7b09 | 452 | { |
476f8b4c | 453 | struct mvebu_gpio_chip *mvchip = irq_desc_get_handler_data(desc); |
01ca59f1 | 454 | struct irq_chip *chip = irq_desc_get_chip(desc); |
fefe7b09 TP |
455 | u32 cause, type; |
456 | int i; | |
457 | ||
458 | if (mvchip == NULL) | |
459 | return; | |
460 | ||
01ca59f1 TP |
461 | chained_irq_enter(chip, desc); |
462 | ||
fefe7b09 TP |
463 | cause = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) & |
464 | readl_relaxed(mvebu_gpioreg_level_mask(mvchip)); | |
465 | cause |= readl_relaxed(mvebu_gpioreg_edge_cause(mvchip)) & | |
466 | readl_relaxed(mvebu_gpioreg_edge_mask(mvchip)); | |
467 | ||
468 | for (i = 0; i < mvchip->chip.ngpio; i++) { | |
469 | int irq; | |
470 | ||
471 | irq = mvchip->irqbase + i; | |
472 | ||
473 | if (!(cause & (1 << i))) | |
474 | continue; | |
475 | ||
fb90c22a | 476 | type = irq_get_trigger_type(irq); |
fefe7b09 TP |
477 | if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) { |
478 | /* Swap polarity (race with GPIO line) */ | |
479 | u32 polarity; | |
480 | ||
481 | polarity = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)); | |
482 | polarity ^= 1 << i; | |
483 | writel_relaxed(polarity, mvebu_gpioreg_in_pol(mvchip)); | |
484 | } | |
01ca59f1 | 485 | |
fefe7b09 TP |
486 | generic_handle_irq(irq); |
487 | } | |
01ca59f1 TP |
488 | |
489 | chained_irq_exit(chip, desc); | |
fefe7b09 TP |
490 | } |
491 | ||
a4ba5e1b SG |
492 | #ifdef CONFIG_DEBUG_FS |
493 | #include <linux/seq_file.h> | |
494 | ||
495 | static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) | |
496 | { | |
497 | struct mvebu_gpio_chip *mvchip = | |
498 | container_of(chip, struct mvebu_gpio_chip, chip); | |
499 | u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk; | |
500 | int i; | |
501 | ||
502 | out = readl_relaxed(mvebu_gpioreg_out(mvchip)); | |
503 | io_conf = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)); | |
504 | blink = readl_relaxed(mvebu_gpioreg_blink(mvchip)); | |
505 | in_pol = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)); | |
506 | data_in = readl_relaxed(mvebu_gpioreg_data_in(mvchip)); | |
507 | cause = readl_relaxed(mvebu_gpioreg_edge_cause(mvchip)); | |
508 | edg_msk = readl_relaxed(mvebu_gpioreg_edge_mask(mvchip)); | |
509 | lvl_msk = readl_relaxed(mvebu_gpioreg_level_mask(mvchip)); | |
510 | ||
511 | for (i = 0; i < chip->ngpio; i++) { | |
512 | const char *label; | |
513 | u32 msk; | |
514 | bool is_out; | |
515 | ||
516 | label = gpiochip_is_requested(chip, i); | |
517 | if (!label) | |
518 | continue; | |
519 | ||
520 | msk = 1 << i; | |
521 | is_out = !(io_conf & msk); | |
522 | ||
523 | seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label); | |
524 | ||
525 | if (is_out) { | |
526 | seq_printf(s, " out %s %s\n", | |
527 | out & msk ? "hi" : "lo", | |
528 | blink & msk ? "(blink )" : ""); | |
529 | continue; | |
530 | } | |
531 | ||
532 | seq_printf(s, " in %s (act %s) - IRQ", | |
533 | (data_in ^ in_pol) & msk ? "hi" : "lo", | |
534 | in_pol & msk ? "lo" : "hi"); | |
535 | if (!((edg_msk | lvl_msk) & msk)) { | |
a4319a61 | 536 | seq_puts(s, " disabled\n"); |
a4ba5e1b SG |
537 | continue; |
538 | } | |
539 | if (edg_msk & msk) | |
a4319a61 | 540 | seq_puts(s, " edge "); |
a4ba5e1b | 541 | if (lvl_msk & msk) |
a4319a61 | 542 | seq_puts(s, " level"); |
a4ba5e1b SG |
543 | seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear "); |
544 | } | |
545 | } | |
546 | #else | |
547 | #define mvebu_gpio_dbg_show NULL | |
548 | #endif | |
549 | ||
271b17b6 | 550 | static const struct of_device_id mvebu_gpio_of_match[] = { |
fefe7b09 TP |
551 | { |
552 | .compatible = "marvell,orion-gpio", | |
a4319a61 | 553 | .data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION, |
fefe7b09 TP |
554 | }, |
555 | { | |
556 | .compatible = "marvell,mv78200-gpio", | |
a4319a61 | 557 | .data = (void *) MVEBU_GPIO_SOC_VARIANT_MV78200, |
fefe7b09 TP |
558 | }, |
559 | { | |
560 | .compatible = "marvell,armadaxp-gpio", | |
a4319a61 | 561 | .data = (void *) MVEBU_GPIO_SOC_VARIANT_ARMADAXP, |
fefe7b09 TP |
562 | }, |
563 | { | |
564 | /* sentinel */ | |
565 | }, | |
566 | }; | |
567 | MODULE_DEVICE_TABLE(of, mvebu_gpio_of_match); | |
568 | ||
b5b7b487 TP |
569 | static int mvebu_gpio_suspend(struct platform_device *pdev, pm_message_t state) |
570 | { | |
571 | struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev); | |
572 | int i; | |
573 | ||
574 | mvchip->out_reg = readl(mvebu_gpioreg_out(mvchip)); | |
575 | mvchip->io_conf_reg = readl(mvebu_gpioreg_io_conf(mvchip)); | |
576 | mvchip->blink_en_reg = readl(mvebu_gpioreg_blink(mvchip)); | |
577 | mvchip->in_pol_reg = readl(mvebu_gpioreg_in_pol(mvchip)); | |
578 | ||
579 | switch (mvchip->soc_variant) { | |
580 | case MVEBU_GPIO_SOC_VARIANT_ORION: | |
581 | mvchip->edge_mask_regs[0] = | |
582 | readl(mvchip->membase + GPIO_EDGE_MASK_OFF); | |
583 | mvchip->level_mask_regs[0] = | |
584 | readl(mvchip->membase + GPIO_LEVEL_MASK_OFF); | |
585 | break; | |
586 | case MVEBU_GPIO_SOC_VARIANT_MV78200: | |
587 | for (i = 0; i < 2; i++) { | |
588 | mvchip->edge_mask_regs[i] = | |
589 | readl(mvchip->membase + | |
590 | GPIO_EDGE_MASK_MV78200_OFF(i)); | |
591 | mvchip->level_mask_regs[i] = | |
592 | readl(mvchip->membase + | |
593 | GPIO_LEVEL_MASK_MV78200_OFF(i)); | |
594 | } | |
595 | break; | |
596 | case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: | |
597 | for (i = 0; i < 4; i++) { | |
598 | mvchip->edge_mask_regs[i] = | |
599 | readl(mvchip->membase + | |
600 | GPIO_EDGE_MASK_ARMADAXP_OFF(i)); | |
601 | mvchip->level_mask_regs[i] = | |
602 | readl(mvchip->membase + | |
603 | GPIO_LEVEL_MASK_ARMADAXP_OFF(i)); | |
604 | } | |
605 | break; | |
606 | default: | |
607 | BUG(); | |
608 | } | |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
613 | static int mvebu_gpio_resume(struct platform_device *pdev) | |
614 | { | |
615 | struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev); | |
616 | int i; | |
617 | ||
618 | writel(mvchip->out_reg, mvebu_gpioreg_out(mvchip)); | |
619 | writel(mvchip->io_conf_reg, mvebu_gpioreg_io_conf(mvchip)); | |
620 | writel(mvchip->blink_en_reg, mvebu_gpioreg_blink(mvchip)); | |
621 | writel(mvchip->in_pol_reg, mvebu_gpioreg_in_pol(mvchip)); | |
622 | ||
623 | switch (mvchip->soc_variant) { | |
624 | case MVEBU_GPIO_SOC_VARIANT_ORION: | |
625 | writel(mvchip->edge_mask_regs[0], | |
626 | mvchip->membase + GPIO_EDGE_MASK_OFF); | |
627 | writel(mvchip->level_mask_regs[0], | |
628 | mvchip->membase + GPIO_LEVEL_MASK_OFF); | |
629 | break; | |
630 | case MVEBU_GPIO_SOC_VARIANT_MV78200: | |
631 | for (i = 0; i < 2; i++) { | |
632 | writel(mvchip->edge_mask_regs[i], | |
633 | mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(i)); | |
634 | writel(mvchip->level_mask_regs[i], | |
635 | mvchip->membase + | |
636 | GPIO_LEVEL_MASK_MV78200_OFF(i)); | |
637 | } | |
638 | break; | |
639 | case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: | |
640 | for (i = 0; i < 4; i++) { | |
641 | writel(mvchip->edge_mask_regs[i], | |
642 | mvchip->membase + | |
643 | GPIO_EDGE_MASK_ARMADAXP_OFF(i)); | |
644 | writel(mvchip->level_mask_regs[i], | |
645 | mvchip->membase + | |
646 | GPIO_LEVEL_MASK_ARMADAXP_OFF(i)); | |
647 | } | |
648 | break; | |
649 | default: | |
650 | BUG(); | |
651 | } | |
652 | ||
653 | return 0; | |
654 | } | |
655 | ||
3836309d | 656 | static int mvebu_gpio_probe(struct platform_device *pdev) |
fefe7b09 TP |
657 | { |
658 | struct mvebu_gpio_chip *mvchip; | |
659 | const struct of_device_id *match; | |
660 | struct device_node *np = pdev->dev.of_node; | |
661 | struct resource *res; | |
662 | struct irq_chip_generic *gc; | |
663 | struct irq_chip_type *ct; | |
de88747f | 664 | struct clk *clk; |
fefe7b09 TP |
665 | unsigned int ngpios; |
666 | int soc_variant; | |
667 | int i, cpu, id; | |
f1d2d081 | 668 | int err; |
fefe7b09 TP |
669 | |
670 | match = of_match_device(mvebu_gpio_of_match, &pdev->dev); | |
671 | if (match) | |
672 | soc_variant = (int) match->data; | |
673 | else | |
674 | soc_variant = MVEBU_GPIO_SOC_VARIANT_ORION; | |
675 | ||
a4319a61 AL |
676 | mvchip = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_gpio_chip), |
677 | GFP_KERNEL); | |
6c8365f6 | 678 | if (!mvchip) |
fefe7b09 | 679 | return -ENOMEM; |
fefe7b09 | 680 | |
b5b7b487 TP |
681 | platform_set_drvdata(pdev, mvchip); |
682 | ||
fefe7b09 TP |
683 | if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) { |
684 | dev_err(&pdev->dev, "Missing ngpios OF property\n"); | |
685 | return -ENODEV; | |
686 | } | |
687 | ||
688 | id = of_alias_get_id(pdev->dev.of_node, "gpio"); | |
689 | if (id < 0) { | |
690 | dev_err(&pdev->dev, "Couldn't get OF id\n"); | |
691 | return id; | |
692 | } | |
693 | ||
de88747f AL |
694 | clk = devm_clk_get(&pdev->dev, NULL); |
695 | /* Not all SoCs require a clock.*/ | |
696 | if (!IS_ERR(clk)) | |
697 | clk_prepare_enable(clk); | |
698 | ||
fefe7b09 TP |
699 | mvchip->soc_variant = soc_variant; |
700 | mvchip->chip.label = dev_name(&pdev->dev); | |
58383c78 | 701 | mvchip->chip.parent = &pdev->dev; |
203f0daa JG |
702 | mvchip->chip.request = gpiochip_generic_request; |
703 | mvchip->chip.free = gpiochip_generic_free; | |
fefe7b09 TP |
704 | mvchip->chip.direction_input = mvebu_gpio_direction_input; |
705 | mvchip->chip.get = mvebu_gpio_get; | |
706 | mvchip->chip.direction_output = mvebu_gpio_direction_output; | |
707 | mvchip->chip.set = mvebu_gpio_set; | |
708 | mvchip->chip.to_irq = mvebu_gpio_to_irq; | |
709 | mvchip->chip.base = id * MVEBU_MAX_GPIO_PER_BANK; | |
710 | mvchip->chip.ngpio = ngpios; | |
9fb1f39e | 711 | mvchip->chip.can_sleep = false; |
fefe7b09 | 712 | mvchip->chip.of_node = np; |
a4ba5e1b | 713 | mvchip->chip.dbg_show = mvebu_gpio_dbg_show; |
fefe7b09 TP |
714 | |
715 | spin_lock_init(&mvchip->lock); | |
08a67a58 | 716 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
641d0342 | 717 | mvchip->membase = devm_ioremap_resource(&pdev->dev, res); |
422d26b6 | 718 | if (IS_ERR(mvchip->membase)) |
641d0342 | 719 | return PTR_ERR(mvchip->membase); |
fefe7b09 TP |
720 | |
721 | /* The Armada XP has a second range of registers for the | |
722 | * per-CPU registers */ | |
723 | if (soc_variant == MVEBU_GPIO_SOC_VARIANT_ARMADAXP) { | |
724 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
641d0342 TR |
725 | mvchip->percpu_membase = devm_ioremap_resource(&pdev->dev, |
726 | res); | |
f4dcd2d9 | 727 | if (IS_ERR(mvchip->percpu_membase)) |
641d0342 | 728 | return PTR_ERR(mvchip->percpu_membase); |
fefe7b09 TP |
729 | } |
730 | ||
731 | /* | |
732 | * Mask and clear GPIO interrupts. | |
733 | */ | |
f4dcd2d9 | 734 | switch (soc_variant) { |
fefe7b09 TP |
735 | case MVEBU_GPIO_SOC_VARIANT_ORION: |
736 | writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF); | |
737 | writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF); | |
738 | writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF); | |
739 | break; | |
740 | case MVEBU_GPIO_SOC_VARIANT_MV78200: | |
741 | writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF); | |
742 | for (cpu = 0; cpu < 2; cpu++) { | |
743 | writel_relaxed(0, mvchip->membase + | |
744 | GPIO_EDGE_MASK_MV78200_OFF(cpu)); | |
745 | writel_relaxed(0, mvchip->membase + | |
746 | GPIO_LEVEL_MASK_MV78200_OFF(cpu)); | |
747 | } | |
748 | break; | |
749 | case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: | |
750 | writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF); | |
751 | writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF); | |
752 | writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF); | |
753 | for (cpu = 0; cpu < 4; cpu++) { | |
754 | writel_relaxed(0, mvchip->percpu_membase + | |
755 | GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu)); | |
756 | writel_relaxed(0, mvchip->percpu_membase + | |
757 | GPIO_EDGE_MASK_ARMADAXP_OFF(cpu)); | |
758 | writel_relaxed(0, mvchip->percpu_membase + | |
759 | GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu)); | |
760 | } | |
761 | break; | |
762 | default: | |
763 | BUG(); | |
764 | } | |
765 | ||
766 | gpiochip_add(&mvchip->chip); | |
767 | ||
768 | /* Some gpio controllers do not provide irq support */ | |
769 | if (!of_irq_count(np)) | |
770 | return 0; | |
771 | ||
772 | /* Setup the interrupt handlers. Each chip can have up to 4 | |
773 | * interrupt handlers, with each handler dealing with 8 GPIO | |
774 | * pins. */ | |
775 | for (i = 0; i < 4; i++) { | |
a4319a61 AL |
776 | int irq = platform_get_irq(pdev, i); |
777 | ||
fefe7b09 TP |
778 | if (irq < 0) |
779 | continue; | |
d68cd06c TG |
780 | irq_set_chained_handler_and_data(irq, mvebu_gpio_irq_handler, |
781 | mvchip); | |
fefe7b09 TP |
782 | } |
783 | ||
784 | mvchip->irqbase = irq_alloc_descs(-1, 0, ngpios, -1); | |
785 | if (mvchip->irqbase < 0) { | |
786 | dev_err(&pdev->dev, "no irqs\n"); | |
f1d2d081 AL |
787 | err = mvchip->irqbase; |
788 | goto err_gpiochip_add; | |
fefe7b09 TP |
789 | } |
790 | ||
791 | gc = irq_alloc_generic_chip("mvebu_gpio_irq", 2, mvchip->irqbase, | |
792 | mvchip->membase, handle_level_irq); | |
f4dcd2d9 | 793 | if (!gc) { |
fefe7b09 | 794 | dev_err(&pdev->dev, "Cannot allocate generic irq_chip\n"); |
f1d2d081 AL |
795 | err = -ENOMEM; |
796 | goto err_gpiochip_add; | |
fefe7b09 TP |
797 | } |
798 | ||
799 | gc->private = mvchip; | |
800 | ct = &gc->chip_types[0]; | |
801 | ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW; | |
802 | ct->chip.irq_mask = mvebu_gpio_level_irq_mask; | |
803 | ct->chip.irq_unmask = mvebu_gpio_level_irq_unmask; | |
804 | ct->chip.irq_set_type = mvebu_gpio_irq_set_type; | |
805 | ct->chip.name = mvchip->chip.label; | |
806 | ||
807 | ct = &gc->chip_types[1]; | |
808 | ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING; | |
809 | ct->chip.irq_ack = mvebu_gpio_irq_ack; | |
810 | ct->chip.irq_mask = mvebu_gpio_edge_irq_mask; | |
811 | ct->chip.irq_unmask = mvebu_gpio_edge_irq_unmask; | |
812 | ct->chip.irq_set_type = mvebu_gpio_irq_set_type; | |
813 | ct->handler = handle_edge_irq; | |
814 | ct->chip.name = mvchip->chip.label; | |
815 | ||
8fcff5f1 | 816 | irq_setup_generic_chip(gc, IRQ_MSK(ngpios), 0, |
fefe7b09 TP |
817 | IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE); |
818 | ||
819 | /* Setup irq domain on top of the generic chip. */ | |
ce931f57 LW |
820 | mvchip->domain = irq_domain_add_simple(np, mvchip->chip.ngpio, |
821 | mvchip->irqbase, | |
fefe7b09 TP |
822 | &irq_domain_simple_ops, |
823 | mvchip); | |
824 | if (!mvchip->domain) { | |
825 | dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n", | |
826 | mvchip->chip.label); | |
f1d2d081 AL |
827 | err = -ENODEV; |
828 | goto err_generic_chip; | |
fefe7b09 TP |
829 | } |
830 | ||
831 | return 0; | |
f1d2d081 AL |
832 | |
833 | err_generic_chip: | |
834 | irq_remove_generic_chip(gc, IRQ_MSK(ngpios), IRQ_NOREQUEST, | |
835 | IRQ_LEVEL | IRQ_NOPROBE); | |
836 | kfree(gc); | |
837 | ||
838 | err_gpiochip_add: | |
839 | gpiochip_remove(&mvchip->chip); | |
840 | ||
841 | return err; | |
fefe7b09 TP |
842 | } |
843 | ||
844 | static struct platform_driver mvebu_gpio_driver = { | |
845 | .driver = { | |
a4319a61 | 846 | .name = "mvebu-gpio", |
fefe7b09 TP |
847 | .of_match_table = mvebu_gpio_of_match, |
848 | }, | |
849 | .probe = mvebu_gpio_probe, | |
b5b7b487 TP |
850 | .suspend = mvebu_gpio_suspend, |
851 | .resume = mvebu_gpio_resume, | |
fefe7b09 | 852 | }; |
dd640039 | 853 | module_platform_driver(mvebu_gpio_driver); |