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a07e103e MD |
1 | /* |
2 | * Emma Mobile GPIO Support - GIO | |
3 | * | |
4 | * Copyright (C) 2012 Magnus Damm | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
20 | #include <linux/init.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/spinlock.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/ioport.h> | |
25 | #include <linux/io.h> | |
26 | #include <linux/irq.h> | |
27 | #include <linux/irqdomain.h> | |
28 | #include <linux/bitops.h> | |
29 | #include <linux/err.h> | |
30 | #include <linux/gpio.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/module.h> | |
640efa08 | 33 | #include <linux/pinctrl/consumer.h> |
a07e103e MD |
34 | #include <linux/platform_data/gpio-em.h> |
35 | ||
36 | struct em_gio_priv { | |
37 | void __iomem *base0; | |
38 | void __iomem *base1; | |
a07e103e MD |
39 | spinlock_t sense_lock; |
40 | struct platform_device *pdev; | |
41 | struct gpio_chip gpio_chip; | |
42 | struct irq_chip irq_chip; | |
43 | struct irq_domain *irq_domain; | |
44 | }; | |
45 | ||
46 | #define GIO_E1 0x00 | |
47 | #define GIO_E0 0x04 | |
48 | #define GIO_EM 0x04 | |
49 | #define GIO_OL 0x08 | |
50 | #define GIO_OH 0x0c | |
51 | #define GIO_I 0x10 | |
52 | #define GIO_IIA 0x14 | |
53 | #define GIO_IEN 0x18 | |
54 | #define GIO_IDS 0x1c | |
55 | #define GIO_IIM 0x1c | |
56 | #define GIO_RAW 0x20 | |
57 | #define GIO_MST 0x24 | |
58 | #define GIO_IIR 0x28 | |
59 | ||
60 | #define GIO_IDT0 0x40 | |
61 | #define GIO_IDT1 0x44 | |
62 | #define GIO_IDT2 0x48 | |
63 | #define GIO_IDT3 0x4c | |
64 | #define GIO_RAWBL 0x50 | |
65 | #define GIO_RAWBH 0x54 | |
66 | #define GIO_IRBL 0x58 | |
67 | #define GIO_IRBH 0x5c | |
68 | ||
69 | #define GIO_IDT(n) (GIO_IDT0 + ((n) * 4)) | |
70 | ||
71 | static inline unsigned long em_gio_read(struct em_gio_priv *p, int offs) | |
72 | { | |
73 | if (offs < GIO_IDT0) | |
74 | return ioread32(p->base0 + offs); | |
75 | else | |
76 | return ioread32(p->base1 + (offs - GIO_IDT0)); | |
77 | } | |
78 | ||
79 | static inline void em_gio_write(struct em_gio_priv *p, int offs, | |
80 | unsigned long value) | |
81 | { | |
82 | if (offs < GIO_IDT0) | |
83 | iowrite32(value, p->base0 + offs); | |
84 | else | |
85 | iowrite32(value, p->base1 + (offs - GIO_IDT0)); | |
86 | } | |
87 | ||
a07e103e MD |
88 | static void em_gio_irq_disable(struct irq_data *d) |
89 | { | |
a9f77c93 | 90 | struct em_gio_priv *p = irq_data_get_irq_chip_data(d); |
a07e103e MD |
91 | |
92 | em_gio_write(p, GIO_IDS, BIT(irqd_to_hwirq(d))); | |
93 | } | |
94 | ||
95 | static void em_gio_irq_enable(struct irq_data *d) | |
96 | { | |
a9f77c93 | 97 | struct em_gio_priv *p = irq_data_get_irq_chip_data(d); |
a07e103e MD |
98 | |
99 | em_gio_write(p, GIO_IEN, BIT(irqd_to_hwirq(d))); | |
100 | } | |
101 | ||
57ef0428 | 102 | static int em_gio_irq_reqres(struct irq_data *d) |
0dc61623 LW |
103 | { |
104 | struct em_gio_priv *p = irq_data_get_irq_chip_data(d); | |
105 | ||
57ef0428 | 106 | if (gpio_lock_as_irq(&p->gpio_chip, irqd_to_hwirq(d))) { |
0dc61623 LW |
107 | dev_err(p->gpio_chip.dev, |
108 | "unable to lock HW IRQ %lu for IRQ\n", | |
109 | irqd_to_hwirq(d)); | |
57ef0428 LW |
110 | return -EINVAL; |
111 | } | |
0dc61623 LW |
112 | return 0; |
113 | } | |
114 | ||
57ef0428 | 115 | static void em_gio_irq_relres(struct irq_data *d) |
0dc61623 LW |
116 | { |
117 | struct em_gio_priv *p = irq_data_get_irq_chip_data(d); | |
118 | ||
0dc61623 LW |
119 | gpio_unlock_as_irq(&p->gpio_chip, irqd_to_hwirq(d)); |
120 | } | |
121 | ||
122 | ||
a07e103e MD |
123 | #define GIO_ASYNC(x) (x + 8) |
124 | ||
125 | static unsigned char em_gio_sense_table[IRQ_TYPE_SENSE_MASK + 1] = { | |
126 | [IRQ_TYPE_EDGE_RISING] = GIO_ASYNC(0x00), | |
127 | [IRQ_TYPE_EDGE_FALLING] = GIO_ASYNC(0x01), | |
128 | [IRQ_TYPE_LEVEL_HIGH] = GIO_ASYNC(0x02), | |
129 | [IRQ_TYPE_LEVEL_LOW] = GIO_ASYNC(0x03), | |
130 | [IRQ_TYPE_EDGE_BOTH] = GIO_ASYNC(0x04), | |
131 | }; | |
132 | ||
133 | static int em_gio_irq_set_type(struct irq_data *d, unsigned int type) | |
134 | { | |
135 | unsigned char value = em_gio_sense_table[type & IRQ_TYPE_SENSE_MASK]; | |
a9f77c93 | 136 | struct em_gio_priv *p = irq_data_get_irq_chip_data(d); |
a07e103e MD |
137 | unsigned int reg, offset, shift; |
138 | unsigned long flags; | |
139 | unsigned long tmp; | |
140 | ||
141 | if (!value) | |
142 | return -EINVAL; | |
143 | ||
144 | offset = irqd_to_hwirq(d); | |
145 | ||
146 | pr_debug("gio: sense irq = %d, mode = %d\n", offset, value); | |
147 | ||
148 | /* 8 x 4 bit fields in 4 IDT registers */ | |
149 | reg = GIO_IDT(offset >> 3); | |
150 | shift = (offset & 0x07) << 4; | |
151 | ||
152 | spin_lock_irqsave(&p->sense_lock, flags); | |
153 | ||
154 | /* disable the interrupt in IIA */ | |
155 | tmp = em_gio_read(p, GIO_IIA); | |
156 | tmp &= ~BIT(offset); | |
157 | em_gio_write(p, GIO_IIA, tmp); | |
158 | ||
159 | /* change the sense setting in IDT */ | |
160 | tmp = em_gio_read(p, reg); | |
161 | tmp &= ~(0xf << shift); | |
162 | tmp |= value << shift; | |
163 | em_gio_write(p, reg, tmp); | |
164 | ||
165 | /* clear pending interrupts */ | |
166 | em_gio_write(p, GIO_IIR, BIT(offset)); | |
167 | ||
168 | /* enable the interrupt in IIA */ | |
169 | tmp = em_gio_read(p, GIO_IIA); | |
170 | tmp |= BIT(offset); | |
171 | em_gio_write(p, GIO_IIA, tmp); | |
172 | ||
173 | spin_unlock_irqrestore(&p->sense_lock, flags); | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | static irqreturn_t em_gio_irq_handler(int irq, void *dev_id) | |
179 | { | |
180 | struct em_gio_priv *p = dev_id; | |
181 | unsigned long pending; | |
182 | unsigned int offset, irqs_handled = 0; | |
183 | ||
184 | while ((pending = em_gio_read(p, GIO_MST))) { | |
185 | offset = __ffs(pending); | |
186 | em_gio_write(p, GIO_IIR, BIT(offset)); | |
187 | generic_handle_irq(irq_find_mapping(p->irq_domain, offset)); | |
188 | irqs_handled++; | |
189 | } | |
190 | ||
191 | return irqs_handled ? IRQ_HANDLED : IRQ_NONE; | |
192 | } | |
193 | ||
194 | static inline struct em_gio_priv *gpio_to_priv(struct gpio_chip *chip) | |
195 | { | |
196 | return container_of(chip, struct em_gio_priv, gpio_chip); | |
197 | } | |
198 | ||
199 | static int em_gio_direction_input(struct gpio_chip *chip, unsigned offset) | |
200 | { | |
201 | em_gio_write(gpio_to_priv(chip), GIO_E0, BIT(offset)); | |
202 | return 0; | |
203 | } | |
204 | ||
205 | static int em_gio_get(struct gpio_chip *chip, unsigned offset) | |
206 | { | |
207 | return (int)(em_gio_read(gpio_to_priv(chip), GIO_I) & BIT(offset)); | |
208 | } | |
209 | ||
210 | static void __em_gio_set(struct gpio_chip *chip, unsigned int reg, | |
211 | unsigned shift, int value) | |
212 | { | |
213 | /* upper 16 bits contains mask and lower 16 actual value */ | |
214 | em_gio_write(gpio_to_priv(chip), reg, | |
5f077644 | 215 | (BIT(shift + 16)) | (value << shift)); |
a07e103e MD |
216 | } |
217 | ||
218 | static void em_gio_set(struct gpio_chip *chip, unsigned offset, int value) | |
219 | { | |
220 | /* output is split into two registers */ | |
221 | if (offset < 16) | |
222 | __em_gio_set(chip, GIO_OL, offset, value); | |
223 | else | |
224 | __em_gio_set(chip, GIO_OH, offset - 16, value); | |
225 | } | |
226 | ||
227 | static int em_gio_direction_output(struct gpio_chip *chip, unsigned offset, | |
228 | int value) | |
229 | { | |
230 | /* write GPIO value to output before selecting output mode of pin */ | |
231 | em_gio_set(chip, offset, value); | |
232 | em_gio_write(gpio_to_priv(chip), GIO_E1, BIT(offset)); | |
233 | return 0; | |
234 | } | |
235 | ||
236 | static int em_gio_to_irq(struct gpio_chip *chip, unsigned offset) | |
237 | { | |
7385500a | 238 | return irq_create_mapping(gpio_to_priv(chip)->irq_domain, offset); |
a07e103e MD |
239 | } |
240 | ||
640efa08 MD |
241 | static int em_gio_request(struct gpio_chip *chip, unsigned offset) |
242 | { | |
243 | return pinctrl_request_gpio(chip->base + offset); | |
244 | } | |
245 | ||
246 | static void em_gio_free(struct gpio_chip *chip, unsigned offset) | |
247 | { | |
248 | pinctrl_free_gpio(chip->base + offset); | |
249 | ||
250 | /* Set the GPIO as an input to ensure that the next GPIO request won't | |
251 | * drive the GPIO pin as an output. | |
252 | */ | |
253 | em_gio_direction_input(chip, offset); | |
254 | } | |
255 | ||
2d61e3e9 LW |
256 | static int em_gio_irq_domain_map(struct irq_domain *h, unsigned int irq, |
257 | irq_hw_number_t hwirq) | |
a07e103e MD |
258 | { |
259 | struct em_gio_priv *p = h->host_data; | |
260 | ||
2d61e3e9 | 261 | pr_debug("gio: map hw irq = %d, irq = %d\n", (int)hwirq, irq); |
a07e103e | 262 | |
2d61e3e9 LW |
263 | irq_set_chip_data(irq, h->host_data); |
264 | irq_set_chip_and_handler(irq, &p->irq_chip, handle_level_irq); | |
265 | set_irq_flags(irq, IRQF_VALID); /* kill me now */ | |
a07e103e MD |
266 | return 0; |
267 | } | |
268 | ||
269 | static struct irq_domain_ops em_gio_irq_domain_ops = { | |
270 | .map = em_gio_irq_domain_map, | |
753c5983 | 271 | .xlate = irq_domain_xlate_twocell, |
a07e103e MD |
272 | }; |
273 | ||
3836309d | 274 | static int em_gio_probe(struct platform_device *pdev) |
a07e103e | 275 | { |
753c5983 | 276 | struct gpio_em_config pdata_dt; |
e56aee18 | 277 | struct gpio_em_config *pdata = dev_get_platdata(&pdev->dev); |
a07e103e MD |
278 | struct em_gio_priv *p; |
279 | struct resource *io[2], *irq[2]; | |
280 | struct gpio_chip *gpio_chip; | |
281 | struct irq_chip *irq_chip; | |
282 | const char *name = dev_name(&pdev->dev); | |
283 | int ret; | |
284 | ||
1cfe6f8c | 285 | p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL); |
a07e103e | 286 | if (!p) { |
a07e103e MD |
287 | ret = -ENOMEM; |
288 | goto err0; | |
289 | } | |
290 | ||
291 | p->pdev = pdev; | |
292 | platform_set_drvdata(pdev, p); | |
293 | spin_lock_init(&p->sense_lock); | |
294 | ||
295 | io[0] = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
296 | io[1] = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
297 | irq[0] = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
298 | irq[1] = platform_get_resource(pdev, IORESOURCE_IRQ, 1); | |
299 | ||
753c5983 MD |
300 | if (!io[0] || !io[1] || !irq[0] || !irq[1]) { |
301 | dev_err(&pdev->dev, "missing IRQ or IOMEM\n"); | |
a07e103e | 302 | ret = -EINVAL; |
1cfe6f8c | 303 | goto err0; |
a07e103e MD |
304 | } |
305 | ||
1cfe6f8c MD |
306 | p->base0 = devm_ioremap_nocache(&pdev->dev, io[0]->start, |
307 | resource_size(io[0])); | |
a07e103e MD |
308 | if (!p->base0) { |
309 | dev_err(&pdev->dev, "failed to remap low I/O memory\n"); | |
310 | ret = -ENXIO; | |
1cfe6f8c | 311 | goto err0; |
a07e103e MD |
312 | } |
313 | ||
1cfe6f8c MD |
314 | p->base1 = devm_ioremap_nocache(&pdev->dev, io[1]->start, |
315 | resource_size(io[1])); | |
a07e103e MD |
316 | if (!p->base1) { |
317 | dev_err(&pdev->dev, "failed to remap high I/O memory\n"); | |
318 | ret = -ENXIO; | |
1cfe6f8c | 319 | goto err0; |
a07e103e MD |
320 | } |
321 | ||
753c5983 MD |
322 | if (!pdata) { |
323 | memset(&pdata_dt, 0, sizeof(pdata_dt)); | |
324 | pdata = &pdata_dt; | |
325 | ||
326 | if (of_property_read_u32(pdev->dev.of_node, "ngpios", | |
327 | &pdata->number_of_pins)) { | |
328 | dev_err(&pdev->dev, "Missing ngpios OF property\n"); | |
329 | ret = -EINVAL; | |
1cfe6f8c | 330 | goto err0; |
753c5983 MD |
331 | } |
332 | ||
333 | ret = of_alias_get_id(pdev->dev.of_node, "gpio"); | |
334 | if (ret < 0) { | |
335 | dev_err(&pdev->dev, "Couldn't get OF id\n"); | |
1cfe6f8c | 336 | goto err0; |
753c5983 MD |
337 | } |
338 | pdata->gpio_base = ret * 32; /* 32 GPIOs per instance */ | |
339 | } | |
340 | ||
a07e103e | 341 | gpio_chip = &p->gpio_chip; |
b5927854 | 342 | gpio_chip->of_node = pdev->dev.of_node; |
a07e103e MD |
343 | gpio_chip->direction_input = em_gio_direction_input; |
344 | gpio_chip->get = em_gio_get; | |
345 | gpio_chip->direction_output = em_gio_direction_output; | |
346 | gpio_chip->set = em_gio_set; | |
347 | gpio_chip->to_irq = em_gio_to_irq; | |
640efa08 MD |
348 | gpio_chip->request = em_gio_request; |
349 | gpio_chip->free = em_gio_free; | |
a07e103e | 350 | gpio_chip->label = name; |
969bf7ae | 351 | gpio_chip->dev = &pdev->dev; |
a07e103e MD |
352 | gpio_chip->owner = THIS_MODULE; |
353 | gpio_chip->base = pdata->gpio_base; | |
354 | gpio_chip->ngpio = pdata->number_of_pins; | |
355 | ||
356 | irq_chip = &p->irq_chip; | |
357 | irq_chip->name = name; | |
358 | irq_chip->irq_mask = em_gio_irq_disable; | |
359 | irq_chip->irq_unmask = em_gio_irq_enable; | |
a07e103e | 360 | irq_chip->irq_set_type = em_gio_irq_set_type; |
57ef0428 LW |
361 | irq_chip->irq_request_resources = em_gio_irq_reqres; |
362 | irq_chip->irq_release_resources = em_gio_irq_relres; | |
03621b60 | 363 | irq_chip->flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND; |
a07e103e | 364 | |
c7886b18 | 365 | p->irq_domain = irq_domain_add_simple(pdev->dev.of_node, |
7385500a | 366 | pdata->number_of_pins, |
c7886b18 | 367 | pdata->irq_base, |
7385500a | 368 | &em_gio_irq_domain_ops, p); |
16310819 AL |
369 | if (!p->irq_domain) { |
370 | ret = -ENXIO; | |
a07e103e | 371 | dev_err(&pdev->dev, "cannot initialize irq domain\n"); |
1cfe6f8c | 372 | goto err0; |
a07e103e MD |
373 | } |
374 | ||
1cfe6f8c MD |
375 | if (devm_request_irq(&pdev->dev, irq[0]->start, |
376 | em_gio_irq_handler, 0, name, p)) { | |
a07e103e MD |
377 | dev_err(&pdev->dev, "failed to request low IRQ\n"); |
378 | ret = -ENOENT; | |
1cfe6f8c | 379 | goto err1; |
a07e103e MD |
380 | } |
381 | ||
1cfe6f8c MD |
382 | if (devm_request_irq(&pdev->dev, irq[1]->start, |
383 | em_gio_irq_handler, 0, name, p)) { | |
a07e103e MD |
384 | dev_err(&pdev->dev, "failed to request high IRQ\n"); |
385 | ret = -ENOENT; | |
1cfe6f8c | 386 | goto err1; |
a07e103e MD |
387 | } |
388 | ||
389 | ret = gpiochip_add(gpio_chip); | |
390 | if (ret) { | |
391 | dev_err(&pdev->dev, "failed to add GPIO controller\n"); | |
1cfe6f8c | 392 | goto err1; |
a07e103e | 393 | } |
640efa08 MD |
394 | |
395 | if (pdata->pctl_name) { | |
396 | ret = gpiochip_add_pin_range(gpio_chip, pdata->pctl_name, 0, | |
397 | gpio_chip->base, gpio_chip->ngpio); | |
398 | if (ret < 0) | |
399 | dev_warn(&pdev->dev, "failed to add pin range\n"); | |
400 | } | |
a07e103e MD |
401 | return 0; |
402 | ||
a07e103e | 403 | err1: |
1cfe6f8c | 404 | irq_domain_remove(p->irq_domain); |
a07e103e MD |
405 | err0: |
406 | return ret; | |
407 | } | |
408 | ||
206210ce | 409 | static int em_gio_remove(struct platform_device *pdev) |
a07e103e MD |
410 | { |
411 | struct em_gio_priv *p = platform_get_drvdata(pdev); | |
a07e103e MD |
412 | int ret; |
413 | ||
414 | ret = gpiochip_remove(&p->gpio_chip); | |
415 | if (ret) | |
416 | return ret; | |
417 | ||
16310819 | 418 | irq_domain_remove(p->irq_domain); |
a07e103e MD |
419 | return 0; |
420 | } | |
421 | ||
753c5983 MD |
422 | static const struct of_device_id em_gio_dt_ids[] = { |
423 | { .compatible = "renesas,em-gio", }, | |
424 | {}, | |
425 | }; | |
426 | MODULE_DEVICE_TABLE(of, em_gio_dt_ids); | |
427 | ||
a07e103e MD |
428 | static struct platform_driver em_gio_device_driver = { |
429 | .probe = em_gio_probe, | |
8283c4ff | 430 | .remove = em_gio_remove, |
a07e103e MD |
431 | .driver = { |
432 | .name = "em_gio", | |
753c5983 MD |
433 | .of_match_table = em_gio_dt_ids, |
434 | .owner = THIS_MODULE, | |
a07e103e MD |
435 | } |
436 | }; | |
437 | ||
753c5983 MD |
438 | static int __init em_gio_init(void) |
439 | { | |
440 | return platform_driver_register(&em_gio_device_driver); | |
441 | } | |
442 | postcore_initcall(em_gio_init); | |
443 | ||
444 | static void __exit em_gio_exit(void) | |
445 | { | |
446 | platform_driver_unregister(&em_gio_device_driver); | |
447 | } | |
448 | module_exit(em_gio_exit); | |
a07e103e MD |
449 | |
450 | MODULE_AUTHOR("Magnus Damm"); | |
451 | MODULE_DESCRIPTION("Renesas Emma Mobile GIO Driver"); | |
452 | MODULE_LICENSE("GPL v2"); |