2 * Copyright (C) 2003-2015 Broadcom Corporation
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>
22 #include <linux/acpi.h>
25 * XLP GPIO has multiple 32 bit registers for each feature where each register
26 * controls 32 pins. So, pins up to 64 require 2 32-bit registers and up to 96
27 * require 3 32-bit registers for each feature.
28 * Here we only define offset of the first register for each feature. Offset of
29 * the registers for pins greater than 32 can be calculated as following(Use
30 * GPIO_INT_STAT as example):
32 * offset = (gpio / XLP_GPIO_REGSZ) * 4;
33 * reg_addr = addr + offset;
35 * where addr is base address of the that feature register and gpio is the pin.
37 #define GPIO_OUTPUT_EN 0x00
38 #define GPIO_PADDRV 0x08
39 #define GPIO_INT_EN00 0x18
40 #define GPIO_INT_EN10 0x20
41 #define GPIO_INT_EN20 0x28
42 #define GPIO_INT_EN30 0x30
43 #define GPIO_INT_POL 0x38
44 #define GPIO_INT_TYPE 0x40
45 #define GPIO_INT_STAT 0x48
47 #define GPIO_9XX_BYTESWAP 0X00
48 #define GPIO_9XX_CTRL 0X04
49 #define GPIO_9XX_OUTPUT_EN 0x14
50 #define GPIO_9XX_PADDRV 0x24
52 * Only for 4 interrupt enable reg are defined for now,
53 * total reg available are 12.
55 #define GPIO_9XX_INT_EN00 0x44
56 #define GPIO_9XX_INT_EN10 0x54
57 #define GPIO_9XX_INT_EN20 0x64
58 #define GPIO_9XX_INT_EN30 0x74
59 #define GPIO_9XX_INT_POL 0x104
60 #define GPIO_9XX_INT_TYPE 0x114
61 #define GPIO_9XX_INT_STAT 0x124
63 #define GPIO_3XX_INT_EN00 0x18
64 #define GPIO_3XX_INT_EN10 0x20
65 #define GPIO_3XX_INT_EN20 0x28
66 #define GPIO_3XX_INT_EN30 0x30
67 #define GPIO_3XX_INT_POL 0x78
68 #define GPIO_3XX_INT_TYPE 0x80
69 #define GPIO_3XX_INT_STAT 0x88
71 /* Interrupt type register mask */
72 #define XLP_GPIO_IRQ_TYPE_LVL 0x0
73 #define XLP_GPIO_IRQ_TYPE_EDGE 0x1
75 /* Interrupt polarity register mask */
76 #define XLP_GPIO_IRQ_POL_HIGH 0x0
77 #define XLP_GPIO_IRQ_POL_LOW 0x1
79 #define XLP_GPIO_REGSZ 32
80 #define XLP_GPIO_IRQ_BASE 768
81 #define XLP_MAX_NR_GPIO 96
83 /* XLP variants supported by this driver */
85 XLP_GPIO_VARIANT_XLP832 = 1,
86 XLP_GPIO_VARIANT_XLP316,
87 XLP_GPIO_VARIANT_XLP208,
88 XLP_GPIO_VARIANT_XLP980,
89 XLP_GPIO_VARIANT_XLP532,
93 struct xlp_gpio_priv {
94 struct gpio_chip chip;
95 DECLARE_BITMAP(gpio_enabled_mask, XLP_MAX_NR_GPIO);
96 void __iomem *gpio_intr_en; /* pointer to first intr enable reg */
97 void __iomem *gpio_intr_stat; /* pointer to first intr status reg */
98 void __iomem *gpio_intr_type; /* pointer to first intr type reg */
99 void __iomem *gpio_intr_pol; /* pointer to first intr polarity reg */
100 void __iomem *gpio_out_en; /* pointer to first output enable reg */
101 void __iomem *gpio_paddrv; /* pointer to first pad drive reg */
105 static int xlp_gpio_get_reg(void __iomem *addr, unsigned gpio)
109 pos = gpio % XLP_GPIO_REGSZ;
110 regset = (gpio / XLP_GPIO_REGSZ) * 4;
111 return !!(readl(addr + regset) & BIT(pos));
114 static void xlp_gpio_set_reg(void __iomem *addr, unsigned gpio, int state)
116 u32 value, pos, regset;
118 pos = gpio % XLP_GPIO_REGSZ;
119 regset = (gpio / XLP_GPIO_REGSZ) * 4;
120 value = readl(addr + regset);
127 writel(value, addr + regset);
130 static void xlp_gpio_irq_disable(struct irq_data *d)
132 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
133 struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
136 spin_lock_irqsave(&priv->lock, flags);
137 xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
138 __clear_bit(d->hwirq, priv->gpio_enabled_mask);
139 spin_unlock_irqrestore(&priv->lock, flags);
142 static void xlp_gpio_irq_mask_ack(struct irq_data *d)
144 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
145 struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
148 spin_lock_irqsave(&priv->lock, flags);
149 xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
150 xlp_gpio_set_reg(priv->gpio_intr_stat, d->hwirq, 0x1);
151 __clear_bit(d->hwirq, priv->gpio_enabled_mask);
152 spin_unlock_irqrestore(&priv->lock, flags);
155 static void xlp_gpio_irq_unmask(struct irq_data *d)
157 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
158 struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
161 spin_lock_irqsave(&priv->lock, flags);
162 xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x1);
163 __set_bit(d->hwirq, priv->gpio_enabled_mask);
164 spin_unlock_irqrestore(&priv->lock, flags);
167 static int xlp_gpio_set_irq_type(struct irq_data *d, unsigned int type)
169 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
170 struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
174 case IRQ_TYPE_EDGE_RISING:
175 irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
176 pol = XLP_GPIO_IRQ_POL_HIGH;
178 case IRQ_TYPE_EDGE_FALLING:
179 irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
180 pol = XLP_GPIO_IRQ_POL_LOW;
182 case IRQ_TYPE_LEVEL_HIGH:
183 irq_type = XLP_GPIO_IRQ_TYPE_LVL;
184 pol = XLP_GPIO_IRQ_POL_HIGH;
186 case IRQ_TYPE_LEVEL_LOW:
187 irq_type = XLP_GPIO_IRQ_TYPE_LVL;
188 pol = XLP_GPIO_IRQ_POL_LOW;
194 xlp_gpio_set_reg(priv->gpio_intr_type, d->hwirq, irq_type);
195 xlp_gpio_set_reg(priv->gpio_intr_pol, d->hwirq, pol);
200 static struct irq_chip xlp_gpio_irq_chip = {
202 .irq_mask_ack = xlp_gpio_irq_mask_ack,
203 .irq_disable = xlp_gpio_irq_disable,
204 .irq_set_type = xlp_gpio_set_irq_type,
205 .irq_unmask = xlp_gpio_irq_unmask,
206 .flags = IRQCHIP_ONESHOT_SAFE,
209 static void xlp_gpio_generic_handler(struct irq_desc *desc)
211 struct xlp_gpio_priv *priv = irq_desc_get_handler_data(desc);
212 struct irq_chip *irqchip = irq_desc_get_chip(desc);
219 chained_irq_enter(irqchip, desc);
220 for_each_set_bit(gpio, priv->gpio_enabled_mask, XLP_MAX_NR_GPIO) {
221 if (regoff != gpio / XLP_GPIO_REGSZ) {
222 regoff = gpio / XLP_GPIO_REGSZ;
223 gpio_stat = readl(priv->gpio_intr_stat + regoff * 4);
226 if (gpio_stat & BIT(gpio % XLP_GPIO_REGSZ))
227 generic_handle_irq(irq_find_mapping(
228 priv->chip.irq.domain, gpio));
230 chained_irq_exit(irqchip, desc);
233 static int xlp_gpio_dir_output(struct gpio_chip *gc, unsigned gpio, int state)
235 struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
237 BUG_ON(gpio >= gc->ngpio);
238 xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x1);
243 static int xlp_gpio_dir_input(struct gpio_chip *gc, unsigned gpio)
245 struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
247 BUG_ON(gpio >= gc->ngpio);
248 xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x0);
253 static int xlp_gpio_get(struct gpio_chip *gc, unsigned gpio)
255 struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
257 BUG_ON(gpio >= gc->ngpio);
258 return xlp_gpio_get_reg(priv->gpio_paddrv, gpio);
261 static void xlp_gpio_set(struct gpio_chip *gc, unsigned gpio, int state)
263 struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
265 BUG_ON(gpio >= gc->ngpio);
266 xlp_gpio_set_reg(priv->gpio_paddrv, gpio, state);
269 static const struct of_device_id xlp_gpio_of_ids[] = {
271 .compatible = "netlogic,xlp832-gpio",
272 .data = (void *)XLP_GPIO_VARIANT_XLP832,
275 .compatible = "netlogic,xlp316-gpio",
276 .data = (void *)XLP_GPIO_VARIANT_XLP316,
279 .compatible = "netlogic,xlp208-gpio",
280 .data = (void *)XLP_GPIO_VARIANT_XLP208,
283 .compatible = "netlogic,xlp980-gpio",
284 .data = (void *)XLP_GPIO_VARIANT_XLP980,
287 .compatible = "netlogic,xlp532-gpio",
288 .data = (void *)XLP_GPIO_VARIANT_XLP532,
291 .compatible = "brcm,vulcan-gpio",
292 .data = (void *)GPIO_VARIANT_VULCAN,
296 MODULE_DEVICE_TABLE(of, xlp_gpio_of_ids);
298 static int xlp_gpio_probe(struct platform_device *pdev)
300 struct gpio_chip *gc;
301 struct resource *iores;
302 struct xlp_gpio_priv *priv;
303 void __iomem *gpio_base;
304 int irq_base, irq, err;
308 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
312 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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);
324 if (pdev->dev.of_node) {
325 const struct of_device_id *of_id;
327 of_id = of_match_device(xlp_gpio_of_ids, &pdev->dev);
329 dev_err(&pdev->dev, "Unable to match OF ID\n");
332 soc_type = (uintptr_t) of_id->data;
334 const struct acpi_device_id *acpi_id;
336 acpi_id = acpi_match_device(pdev->dev.driver->acpi_match_table,
338 if (!acpi_id || !acpi_id->driver_data) {
339 dev_err(&pdev->dev, "Unable to match ACPI ID\n");
342 soc_type = (uintptr_t) acpi_id->driver_data;
346 case XLP_GPIO_VARIANT_XLP832:
347 priv->gpio_out_en = gpio_base + GPIO_OUTPUT_EN;
348 priv->gpio_paddrv = gpio_base + GPIO_PADDRV;
349 priv->gpio_intr_stat = gpio_base + GPIO_INT_STAT;
350 priv->gpio_intr_type = gpio_base + GPIO_INT_TYPE;
351 priv->gpio_intr_pol = gpio_base + GPIO_INT_POL;
352 priv->gpio_intr_en = gpio_base + GPIO_INT_EN00;
355 case XLP_GPIO_VARIANT_XLP208:
356 case XLP_GPIO_VARIANT_XLP316:
357 priv->gpio_out_en = gpio_base + GPIO_OUTPUT_EN;
358 priv->gpio_paddrv = gpio_base + GPIO_PADDRV;
359 priv->gpio_intr_stat = gpio_base + GPIO_3XX_INT_STAT;
360 priv->gpio_intr_type = gpio_base + GPIO_3XX_INT_TYPE;
361 priv->gpio_intr_pol = gpio_base + GPIO_3XX_INT_POL;
362 priv->gpio_intr_en = gpio_base + GPIO_3XX_INT_EN00;
364 ngpio = (soc_type == XLP_GPIO_VARIANT_XLP208) ? 42 : 57;
366 case XLP_GPIO_VARIANT_XLP980:
367 case XLP_GPIO_VARIANT_XLP532:
368 case GPIO_VARIANT_VULCAN:
369 priv->gpio_out_en = gpio_base + GPIO_9XX_OUTPUT_EN;
370 priv->gpio_paddrv = gpio_base + GPIO_9XX_PADDRV;
371 priv->gpio_intr_stat = gpio_base + GPIO_9XX_INT_STAT;
372 priv->gpio_intr_type = gpio_base + GPIO_9XX_INT_TYPE;
373 priv->gpio_intr_pol = gpio_base + GPIO_9XX_INT_POL;
374 priv->gpio_intr_en = gpio_base + GPIO_9XX_INT_EN00;
376 if (soc_type == XLP_GPIO_VARIANT_XLP980)
378 else if (soc_type == XLP_GPIO_VARIANT_XLP532)
384 dev_err(&pdev->dev, "Unknown Processor type!\n");
388 bitmap_zero(priv->gpio_enabled_mask, XLP_MAX_NR_GPIO);
392 gc->owner = THIS_MODULE;
393 gc->label = dev_name(&pdev->dev);
395 gc->parent = &pdev->dev;
397 gc->of_node = pdev->dev.of_node;
398 gc->direction_output = xlp_gpio_dir_output;
399 gc->direction_input = xlp_gpio_dir_input;
400 gc->set = xlp_gpio_set;
401 gc->get = xlp_gpio_get;
403 spin_lock_init(&priv->lock);
405 /* XLP(MIPS) has fixed range for GPIO IRQs, Vulcan(ARM64) does not */
406 if (soc_type != GPIO_VARIANT_VULCAN) {
407 irq_base = devm_irq_alloc_descs(&pdev->dev, -1,
411 dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n");
418 err = gpiochip_add_data(gc, priv);
422 err = gpiochip_irqchip_add(gc, &xlp_gpio_irq_chip, irq_base,
423 handle_level_irq, IRQ_TYPE_NONE);
425 dev_err(&pdev->dev, "Could not connect irqchip to gpiochip!\n");
426 goto out_gpio_remove;
429 gpiochip_set_chained_irqchip(gc, &xlp_gpio_irq_chip, irq,
430 xlp_gpio_generic_handler);
432 dev_info(&pdev->dev, "registered %d GPIOs\n", gc->ngpio);
442 static const struct acpi_device_id xlp_gpio_acpi_match[] = {
443 { "BRCM9006", GPIO_VARIANT_VULCAN },
444 { "CAV9006", GPIO_VARIANT_VULCAN },
447 MODULE_DEVICE_TABLE(acpi, xlp_gpio_acpi_match);
450 static struct platform_driver xlp_gpio_driver = {
453 .of_match_table = xlp_gpio_of_ids,
454 .acpi_match_table = ACPI_PTR(xlp_gpio_acpi_match),
456 .probe = xlp_gpio_probe,
458 module_platform_driver(xlp_gpio_driver);
460 MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>");
461 MODULE_AUTHOR("Ganesan Ramalingam <ganesanr@broadcom.com>");
462 MODULE_DESCRIPTION("Netlogic XLP GPIO Driver");
463 MODULE_LICENSE("GPL v2");