Loading...
1// SPDX-License-Identifier: GPL-2.0+
2//
3// MXS GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de>
4// Copyright 2008 Juergen Beisert, kernel@pengutronix.de
5//
6// Based on code from Freescale,
7// Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved.
8
9#include <linux/err.h>
10#include <linux/init.h>
11#include <linux/interrupt.h>
12#include <linux/io.h>
13#include <linux/irq.h>
14#include <linux/irqdomain.h>
15#include <linux/of.h>
16#include <linux/of_address.h>
17#include <linux/of_device.h>
18#include <linux/platform_device.h>
19#include <linux/slab.h>
20#include <linux/gpio/driver.h>
21#include <linux/module.h>
22
23#define MXS_SET 0x4
24#define MXS_CLR 0x8
25
26#define PINCTRL_DOUT(p) ((is_imx23_gpio(p) ? 0x0500 : 0x0700) + (p->id) * 0x10)
27#define PINCTRL_DIN(p) ((is_imx23_gpio(p) ? 0x0600 : 0x0900) + (p->id) * 0x10)
28#define PINCTRL_DOE(p) ((is_imx23_gpio(p) ? 0x0700 : 0x0b00) + (p->id) * 0x10)
29#define PINCTRL_PIN2IRQ(p) ((is_imx23_gpio(p) ? 0x0800 : 0x1000) + (p->id) * 0x10)
30#define PINCTRL_IRQEN(p) ((is_imx23_gpio(p) ? 0x0900 : 0x1100) + (p->id) * 0x10)
31#define PINCTRL_IRQLEV(p) ((is_imx23_gpio(p) ? 0x0a00 : 0x1200) + (p->id) * 0x10)
32#define PINCTRL_IRQPOL(p) ((is_imx23_gpio(p) ? 0x0b00 : 0x1300) + (p->id) * 0x10)
33#define PINCTRL_IRQSTAT(p) ((is_imx23_gpio(p) ? 0x0c00 : 0x1400) + (p->id) * 0x10)
34
35#define GPIO_INT_FALL_EDGE 0x0
36#define GPIO_INT_LOW_LEV 0x1
37#define GPIO_INT_RISE_EDGE 0x2
38#define GPIO_INT_HIGH_LEV 0x3
39#define GPIO_INT_LEV_MASK (1 << 0)
40#define GPIO_INT_POL_MASK (1 << 1)
41
42enum mxs_gpio_id {
43 IMX23_GPIO,
44 IMX28_GPIO,
45};
46
47struct mxs_gpio_port {
48 void __iomem *base;
49 int id;
50 int irq;
51 struct irq_domain *domain;
52 struct gpio_chip gc;
53 struct device *dev;
54 enum mxs_gpio_id devid;
55 u32 both_edges;
56};
57
58static inline int is_imx23_gpio(struct mxs_gpio_port *port)
59{
60 return port->devid == IMX23_GPIO;
61}
62
63/* Note: This driver assumes 32 GPIOs are handled in one register */
64
65static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
66{
67 u32 val;
68 u32 pin_mask = 1 << d->hwirq;
69 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
70 struct irq_chip_type *ct = irq_data_get_chip_type(d);
71 struct mxs_gpio_port *port = gc->private;
72 void __iomem *pin_addr;
73 int edge;
74
75 if (!(ct->type & type))
76 if (irq_setup_alt_chip(d, type))
77 return -EINVAL;
78
79 port->both_edges &= ~pin_mask;
80 switch (type) {
81 case IRQ_TYPE_EDGE_BOTH:
82 val = readl(port->base + PINCTRL_DIN(port)) & pin_mask;
83 if (val)
84 edge = GPIO_INT_FALL_EDGE;
85 else
86 edge = GPIO_INT_RISE_EDGE;
87 port->both_edges |= pin_mask;
88 break;
89 case IRQ_TYPE_EDGE_RISING:
90 edge = GPIO_INT_RISE_EDGE;
91 break;
92 case IRQ_TYPE_EDGE_FALLING:
93 edge = GPIO_INT_FALL_EDGE;
94 break;
95 case IRQ_TYPE_LEVEL_LOW:
96 edge = GPIO_INT_LOW_LEV;
97 break;
98 case IRQ_TYPE_LEVEL_HIGH:
99 edge = GPIO_INT_HIGH_LEV;
100 break;
101 default:
102 return -EINVAL;
103 }
104
105 /* set level or edge */
106 pin_addr = port->base + PINCTRL_IRQLEV(port);
107 if (edge & GPIO_INT_LEV_MASK) {
108 writel(pin_mask, pin_addr + MXS_SET);
109 writel(pin_mask, port->base + PINCTRL_IRQEN(port) + MXS_SET);
110 } else {
111 writel(pin_mask, pin_addr + MXS_CLR);
112 writel(pin_mask, port->base + PINCTRL_PIN2IRQ(port) + MXS_SET);
113 }
114
115 /* set polarity */
116 pin_addr = port->base + PINCTRL_IRQPOL(port);
117 if (edge & GPIO_INT_POL_MASK)
118 writel(pin_mask, pin_addr + MXS_SET);
119 else
120 writel(pin_mask, pin_addr + MXS_CLR);
121
122 writel(pin_mask, port->base + PINCTRL_IRQSTAT(port) + MXS_CLR);
123
124 return 0;
125}
126
127static void mxs_flip_edge(struct mxs_gpio_port *port, u32 gpio)
128{
129 u32 bit, val, edge;
130 void __iomem *pin_addr;
131
132 bit = 1 << gpio;
133
134 pin_addr = port->base + PINCTRL_IRQPOL(port);
135 val = readl(pin_addr);
136 edge = val & bit;
137
138 if (edge)
139 writel(bit, pin_addr + MXS_CLR);
140 else
141 writel(bit, pin_addr + MXS_SET);
142}
143
144/* MXS has one interrupt *per* gpio port */
145static void mxs_gpio_irq_handler(struct irq_desc *desc)
146{
147 u32 irq_stat;
148 struct mxs_gpio_port *port = irq_desc_get_handler_data(desc);
149
150 desc->irq_data.chip->irq_ack(&desc->irq_data);
151
152 irq_stat = readl(port->base + PINCTRL_IRQSTAT(port)) &
153 readl(port->base + PINCTRL_IRQEN(port));
154
155 while (irq_stat != 0) {
156 int irqoffset = fls(irq_stat) - 1;
157 if (port->both_edges & (1 << irqoffset))
158 mxs_flip_edge(port, irqoffset);
159
160 generic_handle_domain_irq(port->domain, irqoffset);
161 irq_stat &= ~(1 << irqoffset);
162 }
163}
164
165/*
166 * Set interrupt number "irq" in the GPIO as a wake-up source.
167 * While system is running, all registered GPIO interrupts need to have
168 * wake-up enabled. When system is suspended, only selected GPIO interrupts
169 * need to have wake-up enabled.
170 * @param irq interrupt source number
171 * @param enable enable as wake-up if equal to non-zero
172 * @return This function returns 0 on success.
173 */
174static int mxs_gpio_set_wake_irq(struct irq_data *d, unsigned int enable)
175{
176 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
177 struct mxs_gpio_port *port = gc->private;
178
179 if (enable)
180 enable_irq_wake(port->irq);
181 else
182 disable_irq_wake(port->irq);
183
184 return 0;
185}
186
187static int mxs_gpio_init_gc(struct mxs_gpio_port *port, int irq_base)
188{
189 struct irq_chip_generic *gc;
190 struct irq_chip_type *ct;
191 int rv;
192
193 gc = devm_irq_alloc_generic_chip(port->dev, "gpio-mxs", 2, irq_base,
194 port->base, handle_level_irq);
195 if (!gc)
196 return -ENOMEM;
197
198 gc->private = port;
199
200 ct = &gc->chip_types[0];
201 ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
202 ct->chip.irq_ack = irq_gc_ack_set_bit;
203 ct->chip.irq_mask = irq_gc_mask_disable_reg;
204 ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
205 ct->chip.irq_set_type = mxs_gpio_set_irq_type;
206 ct->chip.irq_set_wake = mxs_gpio_set_wake_irq;
207 ct->chip.flags = IRQCHIP_SET_TYPE_MASKED;
208 ct->regs.ack = PINCTRL_IRQSTAT(port) + MXS_CLR;
209 ct->regs.enable = PINCTRL_PIN2IRQ(port) + MXS_SET;
210 ct->regs.disable = PINCTRL_PIN2IRQ(port) + MXS_CLR;
211
212 ct = &gc->chip_types[1];
213 ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
214 ct->chip.irq_ack = irq_gc_ack_set_bit;
215 ct->chip.irq_mask = irq_gc_mask_disable_reg;
216 ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
217 ct->chip.irq_set_type = mxs_gpio_set_irq_type;
218 ct->chip.irq_set_wake = mxs_gpio_set_wake_irq;
219 ct->chip.flags = IRQCHIP_SET_TYPE_MASKED;
220 ct->regs.ack = PINCTRL_IRQSTAT(port) + MXS_CLR;
221 ct->regs.enable = PINCTRL_IRQEN(port) + MXS_SET;
222 ct->regs.disable = PINCTRL_IRQEN(port) + MXS_CLR;
223 ct->handler = handle_level_irq;
224
225 rv = devm_irq_setup_generic_chip(port->dev, gc, IRQ_MSK(32),
226 IRQ_GC_INIT_NESTED_LOCK,
227 IRQ_NOREQUEST, 0);
228
229 return rv;
230}
231
232static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
233{
234 struct mxs_gpio_port *port = gpiochip_get_data(gc);
235
236 return irq_find_mapping(port->domain, offset);
237}
238
239static int mxs_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
240{
241 struct mxs_gpio_port *port = gpiochip_get_data(gc);
242 u32 mask = 1 << offset;
243 u32 dir;
244
245 dir = readl(port->base + PINCTRL_DOE(port));
246 if (dir & mask)
247 return GPIO_LINE_DIRECTION_OUT;
248
249 return GPIO_LINE_DIRECTION_IN;
250}
251
252static const struct of_device_id mxs_gpio_dt_ids[] = {
253 { .compatible = "fsl,imx23-gpio", .data = (void *) IMX23_GPIO, },
254 { .compatible = "fsl,imx28-gpio", .data = (void *) IMX28_GPIO, },
255 { /* sentinel */ }
256};
257MODULE_DEVICE_TABLE(of, mxs_gpio_dt_ids);
258
259static int mxs_gpio_probe(struct platform_device *pdev)
260{
261 struct device_node *np = pdev->dev.of_node;
262 struct device_node *parent;
263 static void __iomem *base;
264 struct mxs_gpio_port *port;
265 int irq_base;
266 int err;
267
268 port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
269 if (!port)
270 return -ENOMEM;
271
272 port->id = of_alias_get_id(np, "gpio");
273 if (port->id < 0)
274 return port->id;
275 port->devid = (enum mxs_gpio_id)of_device_get_match_data(&pdev->dev);
276 port->dev = &pdev->dev;
277 port->irq = platform_get_irq(pdev, 0);
278 if (port->irq < 0)
279 return port->irq;
280
281 /*
282 * map memory region only once, as all the gpio ports
283 * share the same one
284 */
285 if (!base) {
286 parent = of_get_parent(np);
287 base = of_iomap(parent, 0);
288 of_node_put(parent);
289 if (!base)
290 return -EADDRNOTAVAIL;
291 }
292 port->base = base;
293
294 /* initially disable the interrupts */
295 writel(0, port->base + PINCTRL_PIN2IRQ(port));
296 writel(0, port->base + PINCTRL_IRQEN(port));
297
298 /* clear address has to be used to clear IRQSTAT bits */
299 writel(~0U, port->base + PINCTRL_IRQSTAT(port) + MXS_CLR);
300
301 irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0, 32, numa_node_id());
302 if (irq_base < 0) {
303 err = irq_base;
304 goto out_iounmap;
305 }
306
307 port->domain = irq_domain_add_legacy(np, 32, irq_base, 0,
308 &irq_domain_simple_ops, NULL);
309 if (!port->domain) {
310 err = -ENODEV;
311 goto out_iounmap;
312 }
313
314 /* gpio-mxs can be a generic irq chip */
315 err = mxs_gpio_init_gc(port, irq_base);
316 if (err < 0)
317 goto out_irqdomain_remove;
318
319 /* setup one handler for each entry */
320 irq_set_chained_handler_and_data(port->irq, mxs_gpio_irq_handler,
321 port);
322
323 err = bgpio_init(&port->gc, &pdev->dev, 4,
324 port->base + PINCTRL_DIN(port),
325 port->base + PINCTRL_DOUT(port) + MXS_SET,
326 port->base + PINCTRL_DOUT(port) + MXS_CLR,
327 port->base + PINCTRL_DOE(port), NULL, 0);
328 if (err)
329 goto out_irqdomain_remove;
330
331 port->gc.to_irq = mxs_gpio_to_irq;
332 port->gc.get_direction = mxs_gpio_get_direction;
333 port->gc.base = port->id * 32;
334
335 err = gpiochip_add_data(&port->gc, port);
336 if (err)
337 goto out_irqdomain_remove;
338
339 return 0;
340
341out_irqdomain_remove:
342 irq_domain_remove(port->domain);
343out_iounmap:
344 iounmap(port->base);
345 return err;
346}
347
348static struct platform_driver mxs_gpio_driver = {
349 .driver = {
350 .name = "gpio-mxs",
351 .of_match_table = mxs_gpio_dt_ids,
352 .suppress_bind_attrs = true,
353 },
354 .probe = mxs_gpio_probe,
355};
356
357static int __init mxs_gpio_init(void)
358{
359 return platform_driver_register(&mxs_gpio_driver);
360}
361postcore_initcall(mxs_gpio_init);
362
363MODULE_AUTHOR("Freescale Semiconductor, "
364 "Daniel Mack <danielncaiaq.de>, "
365 "Juergen Beisert <kernel@pengutronix.de>");
366MODULE_DESCRIPTION("Freescale MXS GPIO");
367MODULE_LICENSE("GPL");
1/*
2 * MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de>
3 * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
4 *
5 * Based on code from Freescale,
6 * Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
20 * MA 02110-1301, USA.
21 */
22
23#include <linux/err.h>
24#include <linux/init.h>
25#include <linux/interrupt.h>
26#include <linux/io.h>
27#include <linux/irq.h>
28#include <linux/irqdomain.h>
29#include <linux/gpio.h>
30#include <linux/of.h>
31#include <linux/of_address.h>
32#include <linux/of_device.h>
33#include <linux/platform_device.h>
34#include <linux/slab.h>
35#include <linux/basic_mmio_gpio.h>
36#include <linux/module.h>
37
38#define MXS_SET 0x4
39#define MXS_CLR 0x8
40
41#define PINCTRL_DOUT(p) ((is_imx23_gpio(p) ? 0x0500 : 0x0700) + (p->id) * 0x10)
42#define PINCTRL_DIN(p) ((is_imx23_gpio(p) ? 0x0600 : 0x0900) + (p->id) * 0x10)
43#define PINCTRL_DOE(p) ((is_imx23_gpio(p) ? 0x0700 : 0x0b00) + (p->id) * 0x10)
44#define PINCTRL_PIN2IRQ(p) ((is_imx23_gpio(p) ? 0x0800 : 0x1000) + (p->id) * 0x10)
45#define PINCTRL_IRQEN(p) ((is_imx23_gpio(p) ? 0x0900 : 0x1100) + (p->id) * 0x10)
46#define PINCTRL_IRQLEV(p) ((is_imx23_gpio(p) ? 0x0a00 : 0x1200) + (p->id) * 0x10)
47#define PINCTRL_IRQPOL(p) ((is_imx23_gpio(p) ? 0x0b00 : 0x1300) + (p->id) * 0x10)
48#define PINCTRL_IRQSTAT(p) ((is_imx23_gpio(p) ? 0x0c00 : 0x1400) + (p->id) * 0x10)
49
50#define GPIO_INT_FALL_EDGE 0x0
51#define GPIO_INT_LOW_LEV 0x1
52#define GPIO_INT_RISE_EDGE 0x2
53#define GPIO_INT_HIGH_LEV 0x3
54#define GPIO_INT_LEV_MASK (1 << 0)
55#define GPIO_INT_POL_MASK (1 << 1)
56
57enum mxs_gpio_id {
58 IMX23_GPIO,
59 IMX28_GPIO,
60};
61
62struct mxs_gpio_port {
63 void __iomem *base;
64 int id;
65 int irq;
66 struct irq_domain *domain;
67 struct bgpio_chip bgc;
68 enum mxs_gpio_id devid;
69 u32 both_edges;
70};
71
72static inline int is_imx23_gpio(struct mxs_gpio_port *port)
73{
74 return port->devid == IMX23_GPIO;
75}
76
77static inline int is_imx28_gpio(struct mxs_gpio_port *port)
78{
79 return port->devid == IMX28_GPIO;
80}
81
82/* Note: This driver assumes 32 GPIOs are handled in one register */
83
84static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
85{
86 u32 val;
87 u32 pin_mask = 1 << d->hwirq;
88 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
89 struct mxs_gpio_port *port = gc->private;
90 void __iomem *pin_addr;
91 int edge;
92
93 port->both_edges &= ~pin_mask;
94 switch (type) {
95 case IRQ_TYPE_EDGE_BOTH:
96 val = gpio_get_value(port->bgc.gc.base + d->hwirq);
97 if (val)
98 edge = GPIO_INT_FALL_EDGE;
99 else
100 edge = GPIO_INT_RISE_EDGE;
101 port->both_edges |= pin_mask;
102 break;
103 case IRQ_TYPE_EDGE_RISING:
104 edge = GPIO_INT_RISE_EDGE;
105 break;
106 case IRQ_TYPE_EDGE_FALLING:
107 edge = GPIO_INT_FALL_EDGE;
108 break;
109 case IRQ_TYPE_LEVEL_LOW:
110 edge = GPIO_INT_LOW_LEV;
111 break;
112 case IRQ_TYPE_LEVEL_HIGH:
113 edge = GPIO_INT_HIGH_LEV;
114 break;
115 default:
116 return -EINVAL;
117 }
118
119 /* set level or edge */
120 pin_addr = port->base + PINCTRL_IRQLEV(port);
121 if (edge & GPIO_INT_LEV_MASK)
122 writel(pin_mask, pin_addr + MXS_SET);
123 else
124 writel(pin_mask, pin_addr + MXS_CLR);
125
126 /* set polarity */
127 pin_addr = port->base + PINCTRL_IRQPOL(port);
128 if (edge & GPIO_INT_POL_MASK)
129 writel(pin_mask, pin_addr + MXS_SET);
130 else
131 writel(pin_mask, pin_addr + MXS_CLR);
132
133 writel(pin_mask,
134 port->base + PINCTRL_IRQSTAT(port) + MXS_CLR);
135
136 return 0;
137}
138
139static void mxs_flip_edge(struct mxs_gpio_port *port, u32 gpio)
140{
141 u32 bit, val, edge;
142 void __iomem *pin_addr;
143
144 bit = 1 << gpio;
145
146 pin_addr = port->base + PINCTRL_IRQPOL(port);
147 val = readl(pin_addr);
148 edge = val & bit;
149
150 if (edge)
151 writel(bit, pin_addr + MXS_CLR);
152 else
153 writel(bit, pin_addr + MXS_SET);
154}
155
156/* MXS has one interrupt *per* gpio port */
157static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc)
158{
159 u32 irq_stat;
160 struct mxs_gpio_port *port = irq_get_handler_data(irq);
161
162 desc->irq_data.chip->irq_ack(&desc->irq_data);
163
164 irq_stat = readl(port->base + PINCTRL_IRQSTAT(port)) &
165 readl(port->base + PINCTRL_IRQEN(port));
166
167 while (irq_stat != 0) {
168 int irqoffset = fls(irq_stat) - 1;
169 if (port->both_edges & (1 << irqoffset))
170 mxs_flip_edge(port, irqoffset);
171
172 generic_handle_irq(irq_find_mapping(port->domain, irqoffset));
173 irq_stat &= ~(1 << irqoffset);
174 }
175}
176
177/*
178 * Set interrupt number "irq" in the GPIO as a wake-up source.
179 * While system is running, all registered GPIO interrupts need to have
180 * wake-up enabled. When system is suspended, only selected GPIO interrupts
181 * need to have wake-up enabled.
182 * @param irq interrupt source number
183 * @param enable enable as wake-up if equal to non-zero
184 * @return This function returns 0 on success.
185 */
186static int mxs_gpio_set_wake_irq(struct irq_data *d, unsigned int enable)
187{
188 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
189 struct mxs_gpio_port *port = gc->private;
190
191 if (enable)
192 enable_irq_wake(port->irq);
193 else
194 disable_irq_wake(port->irq);
195
196 return 0;
197}
198
199static void __init mxs_gpio_init_gc(struct mxs_gpio_port *port, int irq_base)
200{
201 struct irq_chip_generic *gc;
202 struct irq_chip_type *ct;
203
204 gc = irq_alloc_generic_chip("gpio-mxs", 1, irq_base,
205 port->base, handle_level_irq);
206 gc->private = port;
207
208 ct = gc->chip_types;
209 ct->chip.irq_ack = irq_gc_ack_set_bit;
210 ct->chip.irq_mask = irq_gc_mask_clr_bit;
211 ct->chip.irq_unmask = irq_gc_mask_set_bit;
212 ct->chip.irq_set_type = mxs_gpio_set_irq_type;
213 ct->chip.irq_set_wake = mxs_gpio_set_wake_irq;
214 ct->regs.ack = PINCTRL_IRQSTAT(port) + MXS_CLR;
215 ct->regs.mask = PINCTRL_IRQEN(port);
216
217 irq_setup_generic_chip(gc, IRQ_MSK(32), IRQ_GC_INIT_NESTED_LOCK,
218 IRQ_NOREQUEST, 0);
219}
220
221static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
222{
223 struct bgpio_chip *bgc = to_bgpio_chip(gc);
224 struct mxs_gpio_port *port =
225 container_of(bgc, struct mxs_gpio_port, bgc);
226
227 return irq_find_mapping(port->domain, offset);
228}
229
230static struct platform_device_id mxs_gpio_ids[] = {
231 {
232 .name = "imx23-gpio",
233 .driver_data = IMX23_GPIO,
234 }, {
235 .name = "imx28-gpio",
236 .driver_data = IMX28_GPIO,
237 }, {
238 /* sentinel */
239 }
240};
241MODULE_DEVICE_TABLE(platform, mxs_gpio_ids);
242
243static const struct of_device_id mxs_gpio_dt_ids[] = {
244 { .compatible = "fsl,imx23-gpio", .data = (void *) IMX23_GPIO, },
245 { .compatible = "fsl,imx28-gpio", .data = (void *) IMX28_GPIO, },
246 { /* sentinel */ }
247};
248MODULE_DEVICE_TABLE(of, mxs_gpio_dt_ids);
249
250static int mxs_gpio_probe(struct platform_device *pdev)
251{
252 const struct of_device_id *of_id =
253 of_match_device(mxs_gpio_dt_ids, &pdev->dev);
254 struct device_node *np = pdev->dev.of_node;
255 struct device_node *parent;
256 static void __iomem *base;
257 struct mxs_gpio_port *port;
258 int irq_base;
259 int err;
260
261 port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
262 if (!port)
263 return -ENOMEM;
264
265 port->id = of_alias_get_id(np, "gpio");
266 if (port->id < 0)
267 return port->id;
268 port->devid = (enum mxs_gpio_id) of_id->data;
269 port->irq = platform_get_irq(pdev, 0);
270 if (port->irq < 0)
271 return port->irq;
272
273 /*
274 * map memory region only once, as all the gpio ports
275 * share the same one
276 */
277 if (!base) {
278 parent = of_get_parent(np);
279 base = of_iomap(parent, 0);
280 of_node_put(parent);
281 if (!base)
282 return -EADDRNOTAVAIL;
283 }
284 port->base = base;
285
286 /*
287 * select the pin interrupt functionality but initially
288 * disable the interrupts
289 */
290 writel(~0U, port->base + PINCTRL_PIN2IRQ(port));
291 writel(0, port->base + PINCTRL_IRQEN(port));
292
293 /* clear address has to be used to clear IRQSTAT bits */
294 writel(~0U, port->base + PINCTRL_IRQSTAT(port) + MXS_CLR);
295
296 irq_base = irq_alloc_descs(-1, 0, 32, numa_node_id());
297 if (irq_base < 0)
298 return irq_base;
299
300 port->domain = irq_domain_add_legacy(np, 32, irq_base, 0,
301 &irq_domain_simple_ops, NULL);
302 if (!port->domain) {
303 err = -ENODEV;
304 goto out_irqdesc_free;
305 }
306
307 /* gpio-mxs can be a generic irq chip */
308 mxs_gpio_init_gc(port, irq_base);
309
310 /* setup one handler for each entry */
311 irq_set_chained_handler(port->irq, mxs_gpio_irq_handler);
312 irq_set_handler_data(port->irq, port);
313
314 err = bgpio_init(&port->bgc, &pdev->dev, 4,
315 port->base + PINCTRL_DIN(port),
316 port->base + PINCTRL_DOUT(port) + MXS_SET,
317 port->base + PINCTRL_DOUT(port) + MXS_CLR,
318 port->base + PINCTRL_DOE(port), NULL, 0);
319 if (err)
320 goto out_irqdesc_free;
321
322 port->bgc.gc.to_irq = mxs_gpio_to_irq;
323 port->bgc.gc.base = port->id * 32;
324
325 err = gpiochip_add(&port->bgc.gc);
326 if (err)
327 goto out_bgpio_remove;
328
329 return 0;
330
331out_bgpio_remove:
332 bgpio_remove(&port->bgc);
333out_irqdesc_free:
334 irq_free_descs(irq_base, 32);
335 return err;
336}
337
338static struct platform_driver mxs_gpio_driver = {
339 .driver = {
340 .name = "gpio-mxs",
341 .owner = THIS_MODULE,
342 .of_match_table = mxs_gpio_dt_ids,
343 },
344 .probe = mxs_gpio_probe,
345 .id_table = mxs_gpio_ids,
346};
347
348static int __init mxs_gpio_init(void)
349{
350 return platform_driver_register(&mxs_gpio_driver);
351}
352postcore_initcall(mxs_gpio_init);
353
354MODULE_AUTHOR("Freescale Semiconductor, "
355 "Daniel Mack <danielncaiaq.de>, "
356 "Juergen Beisert <kernel@pengutronix.de>");
357MODULE_DESCRIPTION("Freescale MXS GPIO");
358MODULE_LICENSE("GPL");