Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * AppliedMicro X-Gene SoC GPIO-Standby Driver
4 *
5 * Copyright (c) 2014, Applied Micro Circuits Corporation
6 * Author: Tin Huynh <tnhuynh@apm.com>.
7 * Y Vo <yvo@apm.com>.
8 * Quan Nguyen <qnguyen@apm.com>.
9 */
10
11#include <linux/module.h>
12#include <linux/io.h>
13#include <linux/of.h>
14#include <linux/platform_device.h>
15#include <linux/gpio/driver.h>
16#include <linux/acpi.h>
17
18#include "gpiolib-acpi.h"
19
20/* Common property names */
21#define XGENE_NIRQ_PROPERTY "apm,nr-irqs"
22#define XGENE_NGPIO_PROPERTY "apm,nr-gpios"
23#define XGENE_IRQ_START_PROPERTY "apm,irq-start"
24
25#define XGENE_DFLT_MAX_NGPIO 22
26#define XGENE_DFLT_MAX_NIRQ 6
27#define XGENE_DFLT_IRQ_START_PIN 8
28#define GPIO_MASK(x) (1U << ((x) % 32))
29
30#define MPA_GPIO_INT_LVL 0x0290
31#define MPA_GPIO_OE_ADDR 0x029c
32#define MPA_GPIO_OUT_ADDR 0x02a0
33#define MPA_GPIO_IN_ADDR 0x02a4
34#define MPA_GPIO_SEL_LO 0x0294
35
36#define GPIO_INT_LEVEL_H 0x000001
37#define GPIO_INT_LEVEL_L 0x000000
38
39/**
40 * struct xgene_gpio_sb - GPIO-Standby private data structure.
41 * @gc: memory-mapped GPIO controllers.
42 * @regs: GPIO register base offset
43 * @irq_domain: GPIO interrupt domain
44 * @irq_start: GPIO pin that start support interrupt
45 * @nirq: Number of GPIO pins that supports interrupt
46 * @parent_irq_base: Start parent HWIRQ
47 */
48struct xgene_gpio_sb {
49 struct gpio_chip gc;
50 void __iomem *regs;
51 struct irq_domain *irq_domain;
52 u16 irq_start;
53 u16 nirq;
54 u16 parent_irq_base;
55};
56
57#define HWIRQ_TO_GPIO(priv, hwirq) ((hwirq) + (priv)->irq_start)
58#define GPIO_TO_HWIRQ(priv, gpio) ((gpio) - (priv)->irq_start)
59
60static void xgene_gpio_set_bit(struct gpio_chip *gc,
61 void __iomem *reg, u32 gpio, int val)
62{
63 u32 data;
64
65 data = gc->read_reg(reg);
66 if (val)
67 data |= GPIO_MASK(gpio);
68 else
69 data &= ~GPIO_MASK(gpio);
70 gc->write_reg(reg, data);
71}
72
73static int xgene_gpio_sb_irq_set_type(struct irq_data *d, unsigned int type)
74{
75 struct xgene_gpio_sb *priv = irq_data_get_irq_chip_data(d);
76 int gpio = HWIRQ_TO_GPIO(priv, d->hwirq);
77 int lvl_type = GPIO_INT_LEVEL_H;
78
79 switch (type & IRQ_TYPE_SENSE_MASK) {
80 case IRQ_TYPE_EDGE_RISING:
81 case IRQ_TYPE_LEVEL_HIGH:
82 lvl_type = GPIO_INT_LEVEL_H;
83 break;
84 case IRQ_TYPE_EDGE_FALLING:
85 case IRQ_TYPE_LEVEL_LOW:
86 lvl_type = GPIO_INT_LEVEL_L;
87 break;
88 default:
89 break;
90 }
91
92 xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,
93 gpio * 2, 1);
94 xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_INT_LVL,
95 d->hwirq, lvl_type);
96
97 /* Propagate IRQ type setting to parent */
98 if (type & IRQ_TYPE_EDGE_BOTH)
99 return irq_chip_set_type_parent(d, IRQ_TYPE_EDGE_RISING);
100 else
101 return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH);
102}
103
104static struct irq_chip xgene_gpio_sb_irq_chip = {
105 .name = "sbgpio",
106 .irq_eoi = irq_chip_eoi_parent,
107 .irq_mask = irq_chip_mask_parent,
108 .irq_unmask = irq_chip_unmask_parent,
109 .irq_set_type = xgene_gpio_sb_irq_set_type,
110};
111
112static int xgene_gpio_sb_to_irq(struct gpio_chip *gc, u32 gpio)
113{
114 struct xgene_gpio_sb *priv = gpiochip_get_data(gc);
115 struct irq_fwspec fwspec;
116
117 if ((gpio < priv->irq_start) ||
118 (gpio > HWIRQ_TO_GPIO(priv, priv->nirq)))
119 return -ENXIO;
120
121 fwspec.fwnode = gc->parent->fwnode;
122 fwspec.param_count = 2;
123 fwspec.param[0] = GPIO_TO_HWIRQ(priv, gpio);
124 fwspec.param[1] = IRQ_TYPE_EDGE_RISING;
125 return irq_create_fwspec_mapping(&fwspec);
126}
127
128static int xgene_gpio_sb_domain_activate(struct irq_domain *d,
129 struct irq_data *irq_data,
130 bool reserve)
131{
132 struct xgene_gpio_sb *priv = d->host_data;
133 u32 gpio = HWIRQ_TO_GPIO(priv, irq_data->hwirq);
134 int ret;
135
136 ret = gpiochip_lock_as_irq(&priv->gc, gpio);
137 if (ret) {
138 dev_err(priv->gc.parent,
139 "Unable to configure XGene GPIO standby pin %d as IRQ\n",
140 gpio);
141 return ret;
142 }
143
144 xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,
145 gpio * 2, 1);
146 return 0;
147}
148
149static void xgene_gpio_sb_domain_deactivate(struct irq_domain *d,
150 struct irq_data *irq_data)
151{
152 struct xgene_gpio_sb *priv = d->host_data;
153 u32 gpio = HWIRQ_TO_GPIO(priv, irq_data->hwirq);
154
155 gpiochip_unlock_as_irq(&priv->gc, gpio);
156 xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,
157 gpio * 2, 0);
158}
159
160static int xgene_gpio_sb_domain_translate(struct irq_domain *d,
161 struct irq_fwspec *fwspec,
162 unsigned long *hwirq,
163 unsigned int *type)
164{
165 struct xgene_gpio_sb *priv = d->host_data;
166
167 if ((fwspec->param_count != 2) ||
168 (fwspec->param[0] >= priv->nirq))
169 return -EINVAL;
170 *hwirq = fwspec->param[0];
171 *type = fwspec->param[1];
172 return 0;
173}
174
175static int xgene_gpio_sb_domain_alloc(struct irq_domain *domain,
176 unsigned int virq,
177 unsigned int nr_irqs, void *data)
178{
179 struct irq_fwspec *fwspec = data;
180 struct irq_fwspec parent_fwspec;
181 struct xgene_gpio_sb *priv = domain->host_data;
182 irq_hw_number_t hwirq;
183 unsigned int i;
184
185 hwirq = fwspec->param[0];
186 for (i = 0; i < nr_irqs; i++)
187 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
188 &xgene_gpio_sb_irq_chip, priv);
189
190 parent_fwspec.fwnode = domain->parent->fwnode;
191 if (is_of_node(parent_fwspec.fwnode)) {
192 parent_fwspec.param_count = 3;
193 parent_fwspec.param[0] = 0;/* SPI */
194 /* Skip SGIs and PPIs*/
195 parent_fwspec.param[1] = hwirq + priv->parent_irq_base - 32;
196 parent_fwspec.param[2] = fwspec->param[1];
197 } else if (is_fwnode_irqchip(parent_fwspec.fwnode)) {
198 parent_fwspec.param_count = 2;
199 parent_fwspec.param[0] = hwirq + priv->parent_irq_base;
200 parent_fwspec.param[1] = fwspec->param[1];
201 } else
202 return -EINVAL;
203
204 return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
205 &parent_fwspec);
206}
207
208static const struct irq_domain_ops xgene_gpio_sb_domain_ops = {
209 .translate = xgene_gpio_sb_domain_translate,
210 .alloc = xgene_gpio_sb_domain_alloc,
211 .free = irq_domain_free_irqs_common,
212 .activate = xgene_gpio_sb_domain_activate,
213 .deactivate = xgene_gpio_sb_domain_deactivate,
214};
215
216static int xgene_gpio_sb_probe(struct platform_device *pdev)
217{
218 struct xgene_gpio_sb *priv;
219 int ret;
220 void __iomem *regs;
221 struct irq_domain *parent_domain = NULL;
222 u32 val32;
223
224 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
225 if (!priv)
226 return -ENOMEM;
227
228 regs = devm_platform_ioremap_resource(pdev, 0);
229 if (IS_ERR(regs))
230 return PTR_ERR(regs);
231
232 priv->regs = regs;
233
234 ret = platform_get_irq(pdev, 0);
235 if (ret > 0) {
236 priv->parent_irq_base = irq_get_irq_data(ret)->hwirq;
237 parent_domain = irq_get_irq_data(ret)->domain;
238 }
239 if (!parent_domain) {
240 dev_err(&pdev->dev, "unable to obtain parent domain\n");
241 return -ENODEV;
242 }
243
244 ret = bgpio_init(&priv->gc, &pdev->dev, 4,
245 regs + MPA_GPIO_IN_ADDR,
246 regs + MPA_GPIO_OUT_ADDR, NULL,
247 regs + MPA_GPIO_OE_ADDR, NULL, 0);
248 if (ret)
249 return ret;
250
251 priv->gc.to_irq = xgene_gpio_sb_to_irq;
252
253 /* Retrieve start irq pin, use default if property not found */
254 priv->irq_start = XGENE_DFLT_IRQ_START_PIN;
255 if (!device_property_read_u32(&pdev->dev,
256 XGENE_IRQ_START_PROPERTY, &val32))
257 priv->irq_start = val32;
258
259 /* Retrieve number irqs, use default if property not found */
260 priv->nirq = XGENE_DFLT_MAX_NIRQ;
261 if (!device_property_read_u32(&pdev->dev, XGENE_NIRQ_PROPERTY, &val32))
262 priv->nirq = val32;
263
264 /* Retrieve number gpio, use default if property not found */
265 priv->gc.ngpio = XGENE_DFLT_MAX_NGPIO;
266 if (!device_property_read_u32(&pdev->dev, XGENE_NGPIO_PROPERTY, &val32))
267 priv->gc.ngpio = val32;
268
269 dev_info(&pdev->dev, "Support %d gpios, %d irqs start from pin %d\n",
270 priv->gc.ngpio, priv->nirq, priv->irq_start);
271
272 platform_set_drvdata(pdev, priv);
273
274 priv->irq_domain = irq_domain_create_hierarchy(parent_domain,
275 0, priv->nirq, pdev->dev.fwnode,
276 &xgene_gpio_sb_domain_ops, priv);
277 if (!priv->irq_domain)
278 return -ENODEV;
279
280 priv->gc.irq.domain = priv->irq_domain;
281
282 ret = devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv);
283 if (ret) {
284 dev_err(&pdev->dev,
285 "failed to register X-Gene GPIO Standby driver\n");
286 irq_domain_remove(priv->irq_domain);
287 return ret;
288 }
289
290 dev_info(&pdev->dev, "X-Gene GPIO Standby driver registered\n");
291
292 /* Register interrupt handlers for GPIO signaled ACPI Events */
293 acpi_gpiochip_request_interrupts(&priv->gc);
294
295 return ret;
296}
297
298static void xgene_gpio_sb_remove(struct platform_device *pdev)
299{
300 struct xgene_gpio_sb *priv = platform_get_drvdata(pdev);
301
302 acpi_gpiochip_free_interrupts(&priv->gc);
303
304 irq_domain_remove(priv->irq_domain);
305}
306
307static const struct of_device_id xgene_gpio_sb_of_match[] = {
308 {.compatible = "apm,xgene-gpio-sb", },
309 {},
310};
311MODULE_DEVICE_TABLE(of, xgene_gpio_sb_of_match);
312
313#ifdef CONFIG_ACPI
314static const struct acpi_device_id xgene_gpio_sb_acpi_match[] = {
315 {"APMC0D15", 0},
316 {},
317};
318MODULE_DEVICE_TABLE(acpi, xgene_gpio_sb_acpi_match);
319#endif
320
321static struct platform_driver xgene_gpio_sb_driver = {
322 .driver = {
323 .name = "xgene-gpio-sb",
324 .of_match_table = xgene_gpio_sb_of_match,
325 .acpi_match_table = ACPI_PTR(xgene_gpio_sb_acpi_match),
326 },
327 .probe = xgene_gpio_sb_probe,
328 .remove_new = xgene_gpio_sb_remove,
329};
330module_platform_driver(xgene_gpio_sb_driver);
331
332MODULE_AUTHOR("AppliedMicro");
333MODULE_DESCRIPTION("APM X-Gene GPIO Standby driver");
334MODULE_LICENSE("GPL");
1/*
2 * AppliedMicro X-Gene SoC GPIO-Standby Driver
3 *
4 * Copyright (c) 2014, Applied Micro Circuits Corporation
5 * Author: Tin Huynh <tnhuynh@apm.com>.
6 * Y Vo <yvo@apm.com>.
7 * Quan Nguyen <qnguyen@apm.com>.
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 */
22
23#include <linux/module.h>
24#include <linux/io.h>
25#include <linux/platform_device.h>
26#include <linux/of_gpio.h>
27#include <linux/gpio/driver.h>
28#include <linux/acpi.h>
29
30#include "gpiolib.h"
31
32/* Common property names */
33#define XGENE_NIRQ_PROPERTY "apm,nr-irqs"
34#define XGENE_NGPIO_PROPERTY "apm,nr-gpios"
35#define XGENE_IRQ_START_PROPERTY "apm,irq-start"
36
37#define XGENE_DFLT_MAX_NGPIO 22
38#define XGENE_DFLT_MAX_NIRQ 6
39#define XGENE_DFLT_IRQ_START_PIN 8
40#define GPIO_MASK(x) (1U << ((x) % 32))
41
42#define MPA_GPIO_INT_LVL 0x0290
43#define MPA_GPIO_OE_ADDR 0x029c
44#define MPA_GPIO_OUT_ADDR 0x02a0
45#define MPA_GPIO_IN_ADDR 0x02a4
46#define MPA_GPIO_SEL_LO 0x0294
47
48#define GPIO_INT_LEVEL_H 0x000001
49#define GPIO_INT_LEVEL_L 0x000000
50
51/**
52 * struct xgene_gpio_sb - GPIO-Standby private data structure.
53 * @gc: memory-mapped GPIO controllers.
54 * @regs: GPIO register base offset
55 * @irq_domain: GPIO interrupt domain
56 * @irq_start: GPIO pin that start support interrupt
57 * @nirq: Number of GPIO pins that supports interrupt
58 * @parent_irq_base: Start parent HWIRQ
59 */
60struct xgene_gpio_sb {
61 struct gpio_chip gc;
62 void __iomem *regs;
63 struct irq_domain *irq_domain;
64 u16 irq_start;
65 u16 nirq;
66 u16 parent_irq_base;
67};
68
69#define HWIRQ_TO_GPIO(priv, hwirq) ((hwirq) + (priv)->irq_start)
70#define GPIO_TO_HWIRQ(priv, gpio) ((gpio) - (priv)->irq_start)
71
72static void xgene_gpio_set_bit(struct gpio_chip *gc,
73 void __iomem *reg, u32 gpio, int val)
74{
75 u32 data;
76
77 data = gc->read_reg(reg);
78 if (val)
79 data |= GPIO_MASK(gpio);
80 else
81 data &= ~GPIO_MASK(gpio);
82 gc->write_reg(reg, data);
83}
84
85static int xgene_gpio_sb_irq_set_type(struct irq_data *d, unsigned int type)
86{
87 struct xgene_gpio_sb *priv = irq_data_get_irq_chip_data(d);
88 int gpio = HWIRQ_TO_GPIO(priv, d->hwirq);
89 int lvl_type = GPIO_INT_LEVEL_H;
90
91 switch (type & IRQ_TYPE_SENSE_MASK) {
92 case IRQ_TYPE_EDGE_RISING:
93 case IRQ_TYPE_LEVEL_HIGH:
94 lvl_type = GPIO_INT_LEVEL_H;
95 break;
96 case IRQ_TYPE_EDGE_FALLING:
97 case IRQ_TYPE_LEVEL_LOW:
98 lvl_type = GPIO_INT_LEVEL_L;
99 break;
100 default:
101 break;
102 }
103
104 xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,
105 gpio * 2, 1);
106 xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_INT_LVL,
107 d->hwirq, lvl_type);
108
109 /* Propagate IRQ type setting to parent */
110 if (type & IRQ_TYPE_EDGE_BOTH)
111 return irq_chip_set_type_parent(d, IRQ_TYPE_EDGE_RISING);
112 else
113 return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH);
114}
115
116static struct irq_chip xgene_gpio_sb_irq_chip = {
117 .name = "sbgpio",
118 .irq_eoi = irq_chip_eoi_parent,
119 .irq_mask = irq_chip_mask_parent,
120 .irq_unmask = irq_chip_unmask_parent,
121 .irq_set_type = xgene_gpio_sb_irq_set_type,
122};
123
124static int xgene_gpio_sb_to_irq(struct gpio_chip *gc, u32 gpio)
125{
126 struct xgene_gpio_sb *priv = gpiochip_get_data(gc);
127 struct irq_fwspec fwspec;
128
129 if ((gpio < priv->irq_start) ||
130 (gpio > HWIRQ_TO_GPIO(priv, priv->nirq)))
131 return -ENXIO;
132
133 fwspec.fwnode = gc->parent->fwnode;
134 fwspec.param_count = 2;
135 fwspec.param[0] = GPIO_TO_HWIRQ(priv, gpio);
136 fwspec.param[1] = IRQ_TYPE_NONE;
137 return irq_create_fwspec_mapping(&fwspec);
138}
139
140static int xgene_gpio_sb_domain_activate(struct irq_domain *d,
141 struct irq_data *irq_data,
142 bool reserve)
143{
144 struct xgene_gpio_sb *priv = d->host_data;
145 u32 gpio = HWIRQ_TO_GPIO(priv, irq_data->hwirq);
146
147 if (gpiochip_lock_as_irq(&priv->gc, gpio)) {
148 dev_err(priv->gc.parent,
149 "Unable to configure XGene GPIO standby pin %d as IRQ\n",
150 gpio);
151 return -ENOSPC;
152 }
153
154 xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,
155 gpio * 2, 1);
156 return 0;
157}
158
159static void xgene_gpio_sb_domain_deactivate(struct irq_domain *d,
160 struct irq_data *irq_data)
161{
162 struct xgene_gpio_sb *priv = d->host_data;
163 u32 gpio = HWIRQ_TO_GPIO(priv, irq_data->hwirq);
164
165 gpiochip_unlock_as_irq(&priv->gc, gpio);
166 xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,
167 gpio * 2, 0);
168}
169
170static int xgene_gpio_sb_domain_translate(struct irq_domain *d,
171 struct irq_fwspec *fwspec,
172 unsigned long *hwirq,
173 unsigned int *type)
174{
175 struct xgene_gpio_sb *priv = d->host_data;
176
177 if ((fwspec->param_count != 2) ||
178 (fwspec->param[0] >= priv->nirq))
179 return -EINVAL;
180 *hwirq = fwspec->param[0];
181 *type = fwspec->param[1];
182 return 0;
183}
184
185static int xgene_gpio_sb_domain_alloc(struct irq_domain *domain,
186 unsigned int virq,
187 unsigned int nr_irqs, void *data)
188{
189 struct irq_fwspec *fwspec = data;
190 struct irq_fwspec parent_fwspec;
191 struct xgene_gpio_sb *priv = domain->host_data;
192 irq_hw_number_t hwirq;
193 unsigned int i;
194
195 hwirq = fwspec->param[0];
196 for (i = 0; i < nr_irqs; i++)
197 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
198 &xgene_gpio_sb_irq_chip, priv);
199
200 parent_fwspec.fwnode = domain->parent->fwnode;
201 if (is_of_node(parent_fwspec.fwnode)) {
202 parent_fwspec.param_count = 3;
203 parent_fwspec.param[0] = 0;/* SPI */
204 /* Skip SGIs and PPIs*/
205 parent_fwspec.param[1] = hwirq + priv->parent_irq_base - 32;
206 parent_fwspec.param[2] = fwspec->param[1];
207 } else if (is_fwnode_irqchip(parent_fwspec.fwnode)) {
208 parent_fwspec.param_count = 2;
209 parent_fwspec.param[0] = hwirq + priv->parent_irq_base;
210 parent_fwspec.param[1] = fwspec->param[1];
211 } else
212 return -EINVAL;
213
214 return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
215 &parent_fwspec);
216}
217
218static const struct irq_domain_ops xgene_gpio_sb_domain_ops = {
219 .translate = xgene_gpio_sb_domain_translate,
220 .alloc = xgene_gpio_sb_domain_alloc,
221 .free = irq_domain_free_irqs_common,
222 .activate = xgene_gpio_sb_domain_activate,
223 .deactivate = xgene_gpio_sb_domain_deactivate,
224};
225
226static int xgene_gpio_sb_probe(struct platform_device *pdev)
227{
228 struct xgene_gpio_sb *priv;
229 int ret;
230 struct resource *res;
231 void __iomem *regs;
232 struct irq_domain *parent_domain = NULL;
233 u32 val32;
234
235 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
236 if (!priv)
237 return -ENOMEM;
238
239 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
240 regs = devm_ioremap_resource(&pdev->dev, res);
241 if (IS_ERR(regs))
242 return PTR_ERR(regs);
243
244 priv->regs = regs;
245
246 ret = platform_get_irq(pdev, 0);
247 if (ret > 0) {
248 priv->parent_irq_base = irq_get_irq_data(ret)->hwirq;
249 parent_domain = irq_get_irq_data(ret)->domain;
250 }
251 if (!parent_domain) {
252 dev_err(&pdev->dev, "unable to obtain parent domain\n");
253 return -ENODEV;
254 }
255
256 ret = bgpio_init(&priv->gc, &pdev->dev, 4,
257 regs + MPA_GPIO_IN_ADDR,
258 regs + MPA_GPIO_OUT_ADDR, NULL,
259 regs + MPA_GPIO_OE_ADDR, NULL, 0);
260 if (ret)
261 return ret;
262
263 priv->gc.to_irq = xgene_gpio_sb_to_irq;
264
265 /* Retrieve start irq pin, use default if property not found */
266 priv->irq_start = XGENE_DFLT_IRQ_START_PIN;
267 if (!device_property_read_u32(&pdev->dev,
268 XGENE_IRQ_START_PROPERTY, &val32))
269 priv->irq_start = val32;
270
271 /* Retrieve number irqs, use default if property not found */
272 priv->nirq = XGENE_DFLT_MAX_NIRQ;
273 if (!device_property_read_u32(&pdev->dev, XGENE_NIRQ_PROPERTY, &val32))
274 priv->nirq = val32;
275
276 /* Retrieve number gpio, use default if property not found */
277 priv->gc.ngpio = XGENE_DFLT_MAX_NGPIO;
278 if (!device_property_read_u32(&pdev->dev, XGENE_NGPIO_PROPERTY, &val32))
279 priv->gc.ngpio = val32;
280
281 dev_info(&pdev->dev, "Support %d gpios, %d irqs start from pin %d\n",
282 priv->gc.ngpio, priv->nirq, priv->irq_start);
283
284 platform_set_drvdata(pdev, priv);
285
286 priv->irq_domain = irq_domain_create_hierarchy(parent_domain,
287 0, priv->nirq, pdev->dev.fwnode,
288 &xgene_gpio_sb_domain_ops, priv);
289 if (!priv->irq_domain)
290 return -ENODEV;
291
292 priv->gc.irq.domain = priv->irq_domain;
293
294 ret = devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv);
295 if (ret) {
296 dev_err(&pdev->dev,
297 "failed to register X-Gene GPIO Standby driver\n");
298 irq_domain_remove(priv->irq_domain);
299 return ret;
300 }
301
302 dev_info(&pdev->dev, "X-Gene GPIO Standby driver registered\n");
303
304 if (priv->nirq > 0) {
305 /* Register interrupt handlers for gpio signaled acpi events */
306 acpi_gpiochip_request_interrupts(&priv->gc);
307 }
308
309 return ret;
310}
311
312static int xgene_gpio_sb_remove(struct platform_device *pdev)
313{
314 struct xgene_gpio_sb *priv = platform_get_drvdata(pdev);
315
316 if (priv->nirq > 0) {
317 acpi_gpiochip_free_interrupts(&priv->gc);
318 }
319
320 irq_domain_remove(priv->irq_domain);
321
322 return 0;
323}
324
325static const struct of_device_id xgene_gpio_sb_of_match[] = {
326 {.compatible = "apm,xgene-gpio-sb", },
327 {},
328};
329MODULE_DEVICE_TABLE(of, xgene_gpio_sb_of_match);
330
331#ifdef CONFIG_ACPI
332static const struct acpi_device_id xgene_gpio_sb_acpi_match[] = {
333 {"APMC0D15", 0},
334 {},
335};
336MODULE_DEVICE_TABLE(acpi, xgene_gpio_sb_acpi_match);
337#endif
338
339static struct platform_driver xgene_gpio_sb_driver = {
340 .driver = {
341 .name = "xgene-gpio-sb",
342 .of_match_table = xgene_gpio_sb_of_match,
343 .acpi_match_table = ACPI_PTR(xgene_gpio_sb_acpi_match),
344 },
345 .probe = xgene_gpio_sb_probe,
346 .remove = xgene_gpio_sb_remove,
347};
348module_platform_driver(xgene_gpio_sb_driver);
349
350MODULE_AUTHOR("AppliedMicro");
351MODULE_DESCRIPTION("APM X-Gene GPIO Standby driver");
352MODULE_LICENSE("GPL");