Merge branch 'r6040-next'
[linux/fpc-iii.git] / drivers / gpio / gpio-xlp.c
blob1a33a19d95b98bd01744a3d2200db212f1ab60c7
1 /*
2 * Copyright (C) 2003-2015 Broadcom Corporation
3 * All Rights Reserved
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.
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.
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>
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):
31 * offset = (gpio / XLP_GPIO_REGSZ) * 4;
32 * reg_addr = addr + offset;
34 * where addr is base address of the that feature register and gpio is the pin.
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
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
51 * Only for 4 interrupt enable reg are defined for now,
52 * total reg available are 12.
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
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
70 /* Interrupt type register mask */
71 #define XLP_GPIO_IRQ_TYPE_LVL 0x0
72 #define XLP_GPIO_IRQ_TYPE_EDGE 0x1
74 /* Interrupt polarity register mask */
75 #define XLP_GPIO_IRQ_POL_HIGH 0x0
76 #define XLP_GPIO_IRQ_POL_LOW 0x1
78 #define XLP_GPIO_REGSZ 32
79 #define XLP_GPIO_IRQ_BASE 768
80 #define XLP_MAX_NR_GPIO 96
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 GPIO_VARIANT_VULCAN
92 struct xlp_gpio_priv {
93 struct gpio_chip chip;
94 DECLARE_BITMAP(gpio_enabled_mask, XLP_MAX_NR_GPIO);
95 void __iomem *gpio_intr_en; /* pointer to first intr enable reg */
96 void __iomem *gpio_intr_stat; /* pointer to first intr status reg */
97 void __iomem *gpio_intr_type; /* pointer to first intr type reg */
98 void __iomem *gpio_intr_pol; /* pointer to first intr polarity reg */
99 void __iomem *gpio_out_en; /* pointer to first output enable reg */
100 void __iomem *gpio_paddrv; /* pointer to first pad drive reg */
101 spinlock_t lock;
104 static int xlp_gpio_get_reg(void __iomem *addr, unsigned gpio)
106 u32 pos, regset;
108 pos = gpio % XLP_GPIO_REGSZ;
109 regset = (gpio / XLP_GPIO_REGSZ) * 4;
110 return !!(readl(addr + regset) & BIT(pos));
113 static void xlp_gpio_set_reg(void __iomem *addr, unsigned gpio, int state)
115 u32 value, pos, regset;
117 pos = gpio % XLP_GPIO_REGSZ;
118 regset = (gpio / XLP_GPIO_REGSZ) * 4;
119 value = readl(addr + regset);
121 if (state)
122 value |= BIT(pos);
123 else
124 value &= ~BIT(pos);
126 writel(value, addr + regset);
129 static void xlp_gpio_irq_disable(struct irq_data *d)
131 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
132 struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
133 unsigned long flags;
135 spin_lock_irqsave(&priv->lock, flags);
136 xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
137 __clear_bit(d->hwirq, priv->gpio_enabled_mask);
138 spin_unlock_irqrestore(&priv->lock, flags);
141 static void xlp_gpio_irq_mask_ack(struct irq_data *d)
143 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
144 struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
145 unsigned long flags;
147 spin_lock_irqsave(&priv->lock, flags);
148 xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
149 xlp_gpio_set_reg(priv->gpio_intr_stat, d->hwirq, 0x1);
150 __clear_bit(d->hwirq, priv->gpio_enabled_mask);
151 spin_unlock_irqrestore(&priv->lock, flags);
154 static void xlp_gpio_irq_unmask(struct irq_data *d)
156 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
157 struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
158 unsigned long flags;
160 spin_lock_irqsave(&priv->lock, flags);
161 xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x1);
162 __set_bit(d->hwirq, priv->gpio_enabled_mask);
163 spin_unlock_irqrestore(&priv->lock, flags);
166 static int xlp_gpio_set_irq_type(struct irq_data *d, unsigned int type)
168 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
169 struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
170 int pol, irq_type;
172 switch (type) {
173 case IRQ_TYPE_EDGE_RISING:
174 irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
175 pol = XLP_GPIO_IRQ_POL_HIGH;
176 break;
177 case IRQ_TYPE_EDGE_FALLING:
178 irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
179 pol = XLP_GPIO_IRQ_POL_LOW;
180 break;
181 case IRQ_TYPE_LEVEL_HIGH:
182 irq_type = XLP_GPIO_IRQ_TYPE_LVL;
183 pol = XLP_GPIO_IRQ_POL_HIGH;
184 break;
185 case IRQ_TYPE_LEVEL_LOW:
186 irq_type = XLP_GPIO_IRQ_TYPE_LVL;
187 pol = XLP_GPIO_IRQ_POL_LOW;
188 break;
189 default:
190 return -EINVAL;
193 xlp_gpio_set_reg(priv->gpio_intr_type, d->hwirq, irq_type);
194 xlp_gpio_set_reg(priv->gpio_intr_pol, d->hwirq, pol);
196 return 0;
199 static struct irq_chip xlp_gpio_irq_chip = {
200 .name = "XLP-GPIO",
201 .irq_mask_ack = xlp_gpio_irq_mask_ack,
202 .irq_disable = xlp_gpio_irq_disable,
203 .irq_set_type = xlp_gpio_set_irq_type,
204 .irq_unmask = xlp_gpio_irq_unmask,
205 .flags = IRQCHIP_ONESHOT_SAFE,
208 static void xlp_gpio_generic_handler(struct irq_desc *desc)
210 struct xlp_gpio_priv *priv = irq_desc_get_handler_data(desc);
211 struct irq_chip *irqchip = irq_desc_get_chip(desc);
212 int gpio, regoff;
213 u32 gpio_stat;
215 regoff = -1;
216 gpio_stat = 0;
218 chained_irq_enter(irqchip, desc);
219 for_each_set_bit(gpio, priv->gpio_enabled_mask, XLP_MAX_NR_GPIO) {
220 if (regoff != gpio / XLP_GPIO_REGSZ) {
221 regoff = gpio / XLP_GPIO_REGSZ;
222 gpio_stat = readl(priv->gpio_intr_stat + regoff * 4);
225 if (gpio_stat & BIT(gpio % XLP_GPIO_REGSZ))
226 generic_handle_irq(irq_find_mapping(
227 priv->chip.irqdomain, gpio));
229 chained_irq_exit(irqchip, desc);
232 static int xlp_gpio_dir_output(struct gpio_chip *gc, unsigned gpio, int state)
234 struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
236 BUG_ON(gpio >= gc->ngpio);
237 xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x1);
239 return 0;
242 static int xlp_gpio_dir_input(struct gpio_chip *gc, unsigned gpio)
244 struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
246 BUG_ON(gpio >= gc->ngpio);
247 xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x0);
249 return 0;
252 static int xlp_gpio_get(struct gpio_chip *gc, unsigned gpio)
254 struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
256 BUG_ON(gpio >= gc->ngpio);
257 return xlp_gpio_get_reg(priv->gpio_paddrv, gpio);
260 static void xlp_gpio_set(struct gpio_chip *gc, unsigned gpio, int state)
262 struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
264 BUG_ON(gpio >= gc->ngpio);
265 xlp_gpio_set_reg(priv->gpio_paddrv, gpio, state);
268 static const struct of_device_id xlp_gpio_of_ids[] = {
270 .compatible = "netlogic,xlp832-gpio",
271 .data = (void *)XLP_GPIO_VARIANT_XLP832,
274 .compatible = "netlogic,xlp316-gpio",
275 .data = (void *)XLP_GPIO_VARIANT_XLP316,
278 .compatible = "netlogic,xlp208-gpio",
279 .data = (void *)XLP_GPIO_VARIANT_XLP208,
282 .compatible = "netlogic,xlp980-gpio",
283 .data = (void *)XLP_GPIO_VARIANT_XLP980,
286 .compatible = "netlogic,xlp532-gpio",
287 .data = (void *)XLP_GPIO_VARIANT_XLP532,
290 .compatible = "brcm,vulcan-gpio",
291 .data = (void *)GPIO_VARIANT_VULCAN,
293 { /* sentinel */ },
295 MODULE_DEVICE_TABLE(of, xlp_gpio_of_ids);
297 static int xlp_gpio_probe(struct platform_device *pdev)
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;
308 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
309 if (!iores)
310 return -ENODEV;
312 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
313 if (!priv)
314 return -ENOMEM;
316 gpio_base = devm_ioremap_resource(&pdev->dev, iores);
317 if (IS_ERR(gpio_base))
318 return PTR_ERR(gpio_base);
320 irq = platform_get_irq(pdev, 0);
321 if (irq < 0)
322 return irq;
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;
330 soc_type = (uintptr_t) of_id->data;
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;
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 case GPIO_VARIANT_VULCAN:
356 priv->gpio_out_en = gpio_base + GPIO_9XX_OUTPUT_EN;
357 priv->gpio_paddrv = gpio_base + GPIO_9XX_PADDRV;
358 priv->gpio_intr_stat = gpio_base + GPIO_9XX_INT_STAT;
359 priv->gpio_intr_type = gpio_base + GPIO_9XX_INT_TYPE;
360 priv->gpio_intr_pol = gpio_base + GPIO_9XX_INT_POL;
361 priv->gpio_intr_en = gpio_base + GPIO_9XX_INT_EN00;
363 if (soc_type == XLP_GPIO_VARIANT_XLP980)
364 ngpio = 66;
365 else if (soc_type == XLP_GPIO_VARIANT_XLP532)
366 ngpio = 67;
367 else
368 ngpio = 70;
369 break;
370 default:
371 dev_err(&pdev->dev, "Unknown Processor type!\n");
372 return -ENODEV;
375 bitmap_zero(priv->gpio_enabled_mask, XLP_MAX_NR_GPIO);
377 gc = &priv->chip;
379 gc->owner = THIS_MODULE;
380 gc->label = dev_name(&pdev->dev);
381 gc->base = 0;
382 gc->parent = &pdev->dev;
383 gc->ngpio = ngpio;
384 gc->of_node = pdev->dev.of_node;
385 gc->direction_output = xlp_gpio_dir_output;
386 gc->direction_input = xlp_gpio_dir_input;
387 gc->set = xlp_gpio_set;
388 gc->get = xlp_gpio_get;
390 spin_lock_init(&priv->lock);
391 /* XLP has fixed IRQ range for GPIO interrupts */
392 if (soc_type == GPIO_VARIANT_VULCAN)
393 irq_base = irq_alloc_descs(-1, 0, gc->ngpio, 0);
394 else
395 irq_base = irq_alloc_descs(-1, XLP_GPIO_IRQ_BASE, gc->ngpio, 0);
396 if (irq_base < 0) {
397 dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n");
398 return irq_base;
401 err = gpiochip_add_data(gc, priv);
402 if (err < 0)
403 goto out_free_desc;
405 err = gpiochip_irqchip_add(gc, &xlp_gpio_irq_chip, irq_base,
406 handle_level_irq, IRQ_TYPE_NONE);
407 if (err) {
408 dev_err(&pdev->dev, "Could not connect irqchip to gpiochip!\n");
409 goto out_gpio_remove;
412 gpiochip_set_chained_irqchip(gc, &xlp_gpio_irq_chip, irq,
413 xlp_gpio_generic_handler);
415 dev_info(&pdev->dev, "registered %d GPIOs\n", gc->ngpio);
417 return 0;
419 out_gpio_remove:
420 gpiochip_remove(gc);
421 out_free_desc:
422 irq_free_descs(irq_base, gc->ngpio);
423 return err;
426 static struct platform_driver xlp_gpio_driver = {
427 .driver = {
428 .name = "xlp-gpio",
429 .of_match_table = xlp_gpio_of_ids,
431 .probe = xlp_gpio_probe,
433 module_platform_driver(xlp_gpio_driver);
435 MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>");
436 MODULE_AUTHOR("Ganesan Ramalingam <ganesanr@broadcom.com>");
437 MODULE_DESCRIPTION("Netlogic XLP GPIO Driver");
438 MODULE_LICENSE("GPL v2");