Merge tag 'devicetree-for-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/robh...
[deliverable/linux.git] / drivers / gpio / gpio-xlp.c
1 /*
2 * Copyright (C) 2003-2015 Broadcom Corporation
3 * All Rights Reserved
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15 #include <linux/gpio.h>
16 #include <linux/platform_device.h>
17 #include <linux/of_device.h>
18 #include <linux/module.h>
19 #include <linux/irq.h>
20 #include <linux/interrupt.h>
21 #include <linux/irqchip/chained_irq.h>
22
23 /*
24 * XLP GPIO has multiple 32 bit registers for each feature where each register
25 * controls 32 pins. So, pins up to 64 require 2 32-bit registers and up to 96
26 * require 3 32-bit registers for each feature.
27 * Here we only define offset of the first register for each feature. Offset of
28 * the registers for pins greater than 32 can be calculated as following(Use
29 * GPIO_INT_STAT as example):
30 *
31 * offset = (gpio / XLP_GPIO_REGSZ) * 4;
32 * reg_addr = addr + offset;
33 *
34 * where addr is base address of the that feature register and gpio is the pin.
35 */
36 #define GPIO_OUTPUT_EN 0x00
37 #define GPIO_PADDRV 0x08
38 #define GPIO_INT_EN00 0x18
39 #define GPIO_INT_EN10 0x20
40 #define GPIO_INT_EN20 0x28
41 #define GPIO_INT_EN30 0x30
42 #define GPIO_INT_POL 0x38
43 #define GPIO_INT_TYPE 0x40
44 #define GPIO_INT_STAT 0x48
45
46 #define GPIO_9XX_BYTESWAP 0X00
47 #define GPIO_9XX_CTRL 0X04
48 #define GPIO_9XX_OUTPUT_EN 0x14
49 #define GPIO_9XX_PADDRV 0x24
50 /*
51 * Only for 4 interrupt enable reg are defined for now,
52 * total reg available are 12.
53 */
54 #define GPIO_9XX_INT_EN00 0x44
55 #define GPIO_9XX_INT_EN10 0x54
56 #define GPIO_9XX_INT_EN20 0x64
57 #define GPIO_9XX_INT_EN30 0x74
58 #define GPIO_9XX_INT_POL 0x104
59 #define GPIO_9XX_INT_TYPE 0x114
60 #define GPIO_9XX_INT_STAT 0x124
61
62 #define GPIO_3XX_INT_EN00 0x18
63 #define GPIO_3XX_INT_EN10 0x20
64 #define GPIO_3XX_INT_EN20 0x28
65 #define GPIO_3XX_INT_EN30 0x30
66 #define GPIO_3XX_INT_POL 0x78
67 #define GPIO_3XX_INT_TYPE 0x80
68 #define GPIO_3XX_INT_STAT 0x88
69
70 /* Interrupt type register mask */
71 #define XLP_GPIO_IRQ_TYPE_LVL 0x0
72 #define XLP_GPIO_IRQ_TYPE_EDGE 0x1
73
74 /* Interrupt polarity register mask */
75 #define XLP_GPIO_IRQ_POL_HIGH 0x0
76 #define XLP_GPIO_IRQ_POL_LOW 0x1
77
78 #define XLP_GPIO_REGSZ 32
79 #define XLP_GPIO_IRQ_BASE 768
80 #define XLP_MAX_NR_GPIO 96
81
82 /* XLP variants supported by this driver */
83 enum {
84 XLP_GPIO_VARIANT_XLP832 = 1,
85 XLP_GPIO_VARIANT_XLP316,
86 XLP_GPIO_VARIANT_XLP208,
87 XLP_GPIO_VARIANT_XLP980,
88 XLP_GPIO_VARIANT_XLP532
89 };
90
91 struct xlp_gpio_priv {
92 struct gpio_chip chip;
93 DECLARE_BITMAP(gpio_enabled_mask, XLP_MAX_NR_GPIO);
94 void __iomem *gpio_intr_en; /* pointer to first intr enable reg */
95 void __iomem *gpio_intr_stat; /* pointer to first intr status reg */
96 void __iomem *gpio_intr_type; /* pointer to first intr type reg */
97 void __iomem *gpio_intr_pol; /* pointer to first intr polarity reg */
98 void __iomem *gpio_out_en; /* pointer to first output enable reg */
99 void __iomem *gpio_paddrv; /* pointer to first pad drive reg */
100 spinlock_t lock;
101 };
102
103 static struct xlp_gpio_priv *gpio_chip_to_xlp_priv(struct gpio_chip *gc)
104 {
105 return container_of(gc, struct xlp_gpio_priv, chip);
106 }
107
108 static int xlp_gpio_get_reg(void __iomem *addr, unsigned gpio)
109 {
110 u32 pos, regset;
111
112 pos = gpio % XLP_GPIO_REGSZ;
113 regset = (gpio / XLP_GPIO_REGSZ) * 4;
114 return !!(readl(addr + regset) & BIT(pos));
115 }
116
117 static void xlp_gpio_set_reg(void __iomem *addr, unsigned gpio, int state)
118 {
119 u32 value, pos, regset;
120
121 pos = gpio % XLP_GPIO_REGSZ;
122 regset = (gpio / XLP_GPIO_REGSZ) * 4;
123 value = readl(addr + regset);
124
125 if (state)
126 value |= BIT(pos);
127 else
128 value &= ~BIT(pos);
129
130 writel(value, addr + regset);
131 }
132
133 static void xlp_gpio_irq_disable(struct irq_data *d)
134 {
135 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
136 struct xlp_gpio_priv *priv = gpio_chip_to_xlp_priv(gc);
137 unsigned long flags;
138
139 spin_lock_irqsave(&priv->lock, flags);
140 xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
141 __clear_bit(d->hwirq, priv->gpio_enabled_mask);
142 spin_unlock_irqrestore(&priv->lock, flags);
143 }
144
145 static void xlp_gpio_irq_mask_ack(struct irq_data *d)
146 {
147 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
148 struct xlp_gpio_priv *priv = gpio_chip_to_xlp_priv(gc);
149 unsigned long flags;
150
151 spin_lock_irqsave(&priv->lock, flags);
152 xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
153 xlp_gpio_set_reg(priv->gpio_intr_stat, d->hwirq, 0x1);
154 __clear_bit(d->hwirq, priv->gpio_enabled_mask);
155 spin_unlock_irqrestore(&priv->lock, flags);
156 }
157
158 static void xlp_gpio_irq_unmask(struct irq_data *d)
159 {
160 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
161 struct xlp_gpio_priv *priv = gpio_chip_to_xlp_priv(gc);
162 unsigned long flags;
163
164 spin_lock_irqsave(&priv->lock, flags);
165 xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x1);
166 __set_bit(d->hwirq, priv->gpio_enabled_mask);
167 spin_unlock_irqrestore(&priv->lock, flags);
168 }
169
170 static int xlp_gpio_set_irq_type(struct irq_data *d, unsigned int type)
171 {
172 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
173 struct xlp_gpio_priv *priv = gpio_chip_to_xlp_priv(gc);
174 int pol, irq_type;
175
176 switch (type) {
177 case IRQ_TYPE_EDGE_RISING:
178 irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
179 pol = XLP_GPIO_IRQ_POL_HIGH;
180 break;
181 case IRQ_TYPE_EDGE_FALLING:
182 irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
183 pol = XLP_GPIO_IRQ_POL_LOW;
184 break;
185 case IRQ_TYPE_LEVEL_HIGH:
186 irq_type = XLP_GPIO_IRQ_TYPE_LVL;
187 pol = XLP_GPIO_IRQ_POL_HIGH;
188 break;
189 case IRQ_TYPE_LEVEL_LOW:
190 irq_type = XLP_GPIO_IRQ_TYPE_LVL;
191 pol = XLP_GPIO_IRQ_POL_LOW;
192 break;
193 default:
194 return -EINVAL;
195 }
196
197 xlp_gpio_set_reg(priv->gpio_intr_type, d->hwirq, irq_type);
198 xlp_gpio_set_reg(priv->gpio_intr_pol, d->hwirq, pol);
199
200 return 0;
201 }
202
203 static struct irq_chip xlp_gpio_irq_chip = {
204 .name = "XLP-GPIO",
205 .irq_mask_ack = xlp_gpio_irq_mask_ack,
206 .irq_disable = xlp_gpio_irq_disable,
207 .irq_set_type = xlp_gpio_set_irq_type,
208 .irq_unmask = xlp_gpio_irq_unmask,
209 .flags = IRQCHIP_ONESHOT_SAFE,
210 };
211
212 static void xlp_gpio_generic_handler(struct irq_desc *desc)
213 {
214 struct xlp_gpio_priv *priv = irq_desc_get_handler_data(desc);
215 struct irq_chip *irqchip = irq_desc_get_chip(desc);
216 int gpio, regoff;
217 u32 gpio_stat;
218
219 regoff = -1;
220 gpio_stat = 0;
221
222 chained_irq_enter(irqchip, desc);
223 for_each_set_bit(gpio, priv->gpio_enabled_mask, XLP_MAX_NR_GPIO) {
224 if (regoff != gpio / XLP_GPIO_REGSZ) {
225 regoff = gpio / XLP_GPIO_REGSZ;
226 gpio_stat = readl(priv->gpio_intr_stat + regoff * 4);
227 }
228
229 if (gpio_stat & BIT(gpio % XLP_GPIO_REGSZ))
230 generic_handle_irq(irq_find_mapping(
231 priv->chip.irqdomain, gpio));
232 }
233 chained_irq_exit(irqchip, desc);
234 }
235
236 static int xlp_gpio_dir_output(struct gpio_chip *gc, unsigned gpio, int state)
237 {
238 struct xlp_gpio_priv *priv = gpio_chip_to_xlp_priv(gc);
239
240 BUG_ON(gpio >= gc->ngpio);
241 xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x1);
242
243 return 0;
244 }
245
246 static int xlp_gpio_dir_input(struct gpio_chip *gc, unsigned gpio)
247 {
248 struct xlp_gpio_priv *priv = gpio_chip_to_xlp_priv(gc);
249
250 BUG_ON(gpio >= gc->ngpio);
251 xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x0);
252
253 return 0;
254 }
255
256 static int xlp_gpio_get(struct gpio_chip *gc, unsigned gpio)
257 {
258 struct xlp_gpio_priv *priv = gpio_chip_to_xlp_priv(gc);
259
260 BUG_ON(gpio >= gc->ngpio);
261 return xlp_gpio_get_reg(priv->gpio_paddrv, gpio);
262 }
263
264 static void xlp_gpio_set(struct gpio_chip *gc, unsigned gpio, int state)
265 {
266 struct xlp_gpio_priv *priv = gpio_chip_to_xlp_priv(gc);
267
268 BUG_ON(gpio >= gc->ngpio);
269 xlp_gpio_set_reg(priv->gpio_paddrv, gpio, state);
270 }
271
272 static const struct of_device_id xlp_gpio_of_ids[] = {
273 {
274 .compatible = "netlogic,xlp832-gpio",
275 .data = (void *)XLP_GPIO_VARIANT_XLP832,
276 },
277 {
278 .compatible = "netlogic,xlp316-gpio",
279 .data = (void *)XLP_GPIO_VARIANT_XLP316,
280 },
281 {
282 .compatible = "netlogic,xlp208-gpio",
283 .data = (void *)XLP_GPIO_VARIANT_XLP208,
284 },
285 {
286 .compatible = "netlogic,xlp980-gpio",
287 .data = (void *)XLP_GPIO_VARIANT_XLP980,
288 },
289 {
290 .compatible = "netlogic,xlp532-gpio",
291 .data = (void *)XLP_GPIO_VARIANT_XLP532,
292 },
293 { /* sentinel */ },
294 };
295 MODULE_DEVICE_TABLE(of, xlp_gpio_of_ids);
296
297 static int xlp_gpio_probe(struct platform_device *pdev)
298 {
299 struct gpio_chip *gc;
300 struct resource *iores;
301 struct xlp_gpio_priv *priv;
302 const struct of_device_id *of_id;
303 void __iomem *gpio_base;
304 int irq_base, irq, err;
305 int ngpio;
306 u32 soc_type;
307
308 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
309 if (!iores)
310 return -ENODEV;
311
312 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
313 if (!priv)
314 return -ENOMEM;
315
316 gpio_base = devm_ioremap_resource(&pdev->dev, iores);
317 if (IS_ERR(gpio_base))
318 return PTR_ERR(gpio_base);
319
320 irq = platform_get_irq(pdev, 0);
321 if (irq < 0)
322 return irq;
323
324 of_id = of_match_device(xlp_gpio_of_ids, &pdev->dev);
325 if (!of_id) {
326 dev_err(&pdev->dev, "Failed to get soc type!\n");
327 return -ENODEV;
328 }
329
330 soc_type = (uintptr_t) of_id->data;
331
332 switch (soc_type) {
333 case XLP_GPIO_VARIANT_XLP832:
334 priv->gpio_out_en = gpio_base + GPIO_OUTPUT_EN;
335 priv->gpio_paddrv = gpio_base + GPIO_PADDRV;
336 priv->gpio_intr_stat = gpio_base + GPIO_INT_STAT;
337 priv->gpio_intr_type = gpio_base + GPIO_INT_TYPE;
338 priv->gpio_intr_pol = gpio_base + GPIO_INT_POL;
339 priv->gpio_intr_en = gpio_base + GPIO_INT_EN00;
340 ngpio = 41;
341 break;
342 case XLP_GPIO_VARIANT_XLP208:
343 case XLP_GPIO_VARIANT_XLP316:
344 priv->gpio_out_en = gpio_base + GPIO_OUTPUT_EN;
345 priv->gpio_paddrv = gpio_base + GPIO_PADDRV;
346 priv->gpio_intr_stat = gpio_base + GPIO_3XX_INT_STAT;
347 priv->gpio_intr_type = gpio_base + GPIO_3XX_INT_TYPE;
348 priv->gpio_intr_pol = gpio_base + GPIO_3XX_INT_POL;
349 priv->gpio_intr_en = gpio_base + GPIO_3XX_INT_EN00;
350
351 ngpio = (soc_type == XLP_GPIO_VARIANT_XLP208) ? 42 : 57;
352 break;
353 case XLP_GPIO_VARIANT_XLP980:
354 case XLP_GPIO_VARIANT_XLP532:
355 priv->gpio_out_en = gpio_base + GPIO_9XX_OUTPUT_EN;
356 priv->gpio_paddrv = gpio_base + GPIO_9XX_PADDRV;
357 priv->gpio_intr_stat = gpio_base + GPIO_9XX_INT_STAT;
358 priv->gpio_intr_type = gpio_base + GPIO_9XX_INT_TYPE;
359 priv->gpio_intr_pol = gpio_base + GPIO_9XX_INT_POL;
360 priv->gpio_intr_en = gpio_base + GPIO_9XX_INT_EN00;
361
362 ngpio = (soc_type == XLP_GPIO_VARIANT_XLP980) ? 66 : 67;
363 break;
364 default:
365 dev_err(&pdev->dev, "Unknown Processor type!\n");
366 return -ENODEV;
367 }
368
369 bitmap_zero(priv->gpio_enabled_mask, XLP_MAX_NR_GPIO);
370
371 gc = &priv->chip;
372
373 gc->owner = THIS_MODULE;
374 gc->label = dev_name(&pdev->dev);
375 gc->base = 0;
376 gc->dev = &pdev->dev;
377 gc->ngpio = ngpio;
378 gc->of_node = pdev->dev.of_node;
379 gc->direction_output = xlp_gpio_dir_output;
380 gc->direction_input = xlp_gpio_dir_input;
381 gc->set = xlp_gpio_set;
382 gc->get = xlp_gpio_get;
383
384 spin_lock_init(&priv->lock);
385 irq_base = irq_alloc_descs(-1, XLP_GPIO_IRQ_BASE, gc->ngpio, 0);
386 if (irq_base < 0) {
387 dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n");
388 return -ENODEV;
389 }
390
391 err = gpiochip_add(gc);
392 if (err < 0)
393 goto out_free_desc;
394
395 err = gpiochip_irqchip_add(gc, &xlp_gpio_irq_chip, irq_base,
396 handle_level_irq, IRQ_TYPE_NONE);
397 if (err) {
398 dev_err(&pdev->dev, "Could not connect irqchip to gpiochip!\n");
399 goto out_gpio_remove;
400 }
401
402 gpiochip_set_chained_irqchip(gc, &xlp_gpio_irq_chip, irq,
403 xlp_gpio_generic_handler);
404
405 dev_info(&pdev->dev, "registered %d GPIOs\n", gc->ngpio);
406
407 return 0;
408
409 out_gpio_remove:
410 gpiochip_remove(gc);
411 out_free_desc:
412 irq_free_descs(irq_base, gc->ngpio);
413 return err;
414 }
415
416 static struct platform_driver xlp_gpio_driver = {
417 .driver = {
418 .name = "xlp-gpio",
419 .of_match_table = xlp_gpio_of_ids,
420 },
421 .probe = xlp_gpio_probe,
422 };
423 module_platform_driver(xlp_gpio_driver);
424
425 MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>");
426 MODULE_AUTHOR("Ganesan Ramalingam <ganesanr@broadcom.com>");
427 MODULE_DESCRIPTION("Netlogic XLP GPIO Driver");
428 MODULE_LICENSE("GPL v2");
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