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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/init.h>
24#include <linux/interrupt.h>
25#include <linux/io.h>
26#include <linux/irq.h>
27#include <linux/gpio.h>
28#include <linux/platform_device.h>
29#include <linux/slab.h>
30#include <linux/basic_mmio_gpio.h>
31#include <mach/mxs.h>
32
33#define MXS_SET 0x4
34#define MXS_CLR 0x8
35
36#define PINCTRL_DOUT(n) ((cpu_is_mx23() ? 0x0500 : 0x0700) + (n) * 0x10)
37#define PINCTRL_DIN(n) ((cpu_is_mx23() ? 0x0600 : 0x0900) + (n) * 0x10)
38#define PINCTRL_DOE(n) ((cpu_is_mx23() ? 0x0700 : 0x0b00) + (n) * 0x10)
39#define PINCTRL_PIN2IRQ(n) ((cpu_is_mx23() ? 0x0800 : 0x1000) + (n) * 0x10)
40#define PINCTRL_IRQEN(n) ((cpu_is_mx23() ? 0x0900 : 0x1100) + (n) * 0x10)
41#define PINCTRL_IRQLEV(n) ((cpu_is_mx23() ? 0x0a00 : 0x1200) + (n) * 0x10)
42#define PINCTRL_IRQPOL(n) ((cpu_is_mx23() ? 0x0b00 : 0x1300) + (n) * 0x10)
43#define PINCTRL_IRQSTAT(n) ((cpu_is_mx23() ? 0x0c00 : 0x1400) + (n) * 0x10)
44
45#define GPIO_INT_FALL_EDGE 0x0
46#define GPIO_INT_LOW_LEV 0x1
47#define GPIO_INT_RISE_EDGE 0x2
48#define GPIO_INT_HIGH_LEV 0x3
49#define GPIO_INT_LEV_MASK (1 << 0)
50#define GPIO_INT_POL_MASK (1 << 1)
51
52struct mxs_gpio_port {
53 void __iomem *base;
54 int id;
55 int irq;
56 int virtual_irq_start;
57 struct bgpio_chip bgc;
58};
59
60/* Note: This driver assumes 32 GPIOs are handled in one register */
61
62static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
63{
64 u32 gpio = irq_to_gpio(d->irq);
65 u32 pin_mask = 1 << (gpio & 31);
66 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
67 struct mxs_gpio_port *port = gc->private;
68 void __iomem *pin_addr;
69 int edge;
70
71 switch (type) {
72 case IRQ_TYPE_EDGE_RISING:
73 edge = GPIO_INT_RISE_EDGE;
74 break;
75 case IRQ_TYPE_EDGE_FALLING:
76 edge = GPIO_INT_FALL_EDGE;
77 break;
78 case IRQ_TYPE_LEVEL_LOW:
79 edge = GPIO_INT_LOW_LEV;
80 break;
81 case IRQ_TYPE_LEVEL_HIGH:
82 edge = GPIO_INT_HIGH_LEV;
83 break;
84 default:
85 return -EINVAL;
86 }
87
88 /* set level or edge */
89 pin_addr = port->base + PINCTRL_IRQLEV(port->id);
90 if (edge & GPIO_INT_LEV_MASK)
91 writel(pin_mask, pin_addr + MXS_SET);
92 else
93 writel(pin_mask, pin_addr + MXS_CLR);
94
95 /* set polarity */
96 pin_addr = port->base + PINCTRL_IRQPOL(port->id);
97 if (edge & GPIO_INT_POL_MASK)
98 writel(pin_mask, pin_addr + MXS_SET);
99 else
100 writel(pin_mask, pin_addr + MXS_CLR);
101
102 writel(1 << (gpio & 0x1f),
103 port->base + PINCTRL_IRQSTAT(port->id) + MXS_CLR);
104
105 return 0;
106}
107
108/* MXS has one interrupt *per* gpio port */
109static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc)
110{
111 u32 irq_stat;
112 struct mxs_gpio_port *port = irq_get_handler_data(irq);
113 u32 gpio_irq_no_base = port->virtual_irq_start;
114
115 desc->irq_data.chip->irq_ack(&desc->irq_data);
116
117 irq_stat = readl(port->base + PINCTRL_IRQSTAT(port->id)) &
118 readl(port->base + PINCTRL_IRQEN(port->id));
119
120 while (irq_stat != 0) {
121 int irqoffset = fls(irq_stat) - 1;
122 generic_handle_irq(gpio_irq_no_base + irqoffset);
123 irq_stat &= ~(1 << irqoffset);
124 }
125}
126
127/*
128 * Set interrupt number "irq" in the GPIO as a wake-up source.
129 * While system is running, all registered GPIO interrupts need to have
130 * wake-up enabled. When system is suspended, only selected GPIO interrupts
131 * need to have wake-up enabled.
132 * @param irq interrupt source number
133 * @param enable enable as wake-up if equal to non-zero
134 * @return This function returns 0 on success.
135 */
136static int mxs_gpio_set_wake_irq(struct irq_data *d, unsigned int enable)
137{
138 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
139 struct mxs_gpio_port *port = gc->private;
140
141 if (enable)
142 enable_irq_wake(port->irq);
143 else
144 disable_irq_wake(port->irq);
145
146 return 0;
147}
148
149static void __init mxs_gpio_init_gc(struct mxs_gpio_port *port)
150{
151 struct irq_chip_generic *gc;
152 struct irq_chip_type *ct;
153
154 gc = irq_alloc_generic_chip("gpio-mxs", 1, port->virtual_irq_start,
155 port->base, handle_level_irq);
156 gc->private = port;
157
158 ct = gc->chip_types;
159 ct->chip.irq_ack = irq_gc_ack_set_bit;
160 ct->chip.irq_mask = irq_gc_mask_clr_bit;
161 ct->chip.irq_unmask = irq_gc_mask_set_bit;
162 ct->chip.irq_set_type = mxs_gpio_set_irq_type;
163 ct->chip.irq_set_wake = mxs_gpio_set_wake_irq;
164 ct->regs.ack = PINCTRL_IRQSTAT(port->id) + MXS_CLR;
165 ct->regs.mask = PINCTRL_IRQEN(port->id);
166
167 irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0);
168}
169
170static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
171{
172 struct bgpio_chip *bgc = to_bgpio_chip(gc);
173 struct mxs_gpio_port *port =
174 container_of(bgc, struct mxs_gpio_port, bgc);
175
176 return port->virtual_irq_start + offset;
177}
178
179static int __devinit mxs_gpio_probe(struct platform_device *pdev)
180{
181 static void __iomem *base;
182 struct mxs_gpio_port *port;
183 struct resource *iores = NULL;
184 int err;
185
186 port = kzalloc(sizeof(struct mxs_gpio_port), GFP_KERNEL);
187 if (!port)
188 return -ENOMEM;
189
190 port->id = pdev->id;
191 port->virtual_irq_start = MXS_GPIO_IRQ_START + port->id * 32;
192
193 /*
194 * map memory region only once, as all the gpio ports
195 * share the same one
196 */
197 if (!base) {
198 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
199 if (!iores) {
200 err = -ENODEV;
201 goto out_kfree;
202 }
203
204 if (!request_mem_region(iores->start, resource_size(iores),
205 pdev->name)) {
206 err = -EBUSY;
207 goto out_kfree;
208 }
209
210 base = ioremap(iores->start, resource_size(iores));
211 if (!base) {
212 err = -ENOMEM;
213 goto out_release_mem;
214 }
215 }
216 port->base = base;
217
218 port->irq = platform_get_irq(pdev, 0);
219 if (port->irq < 0) {
220 err = -EINVAL;
221 goto out_iounmap;
222 }
223
224 /*
225 * select the pin interrupt functionality but initially
226 * disable the interrupts
227 */
228 writel(~0U, port->base + PINCTRL_PIN2IRQ(port->id));
229 writel(0, port->base + PINCTRL_IRQEN(port->id));
230
231 /* clear address has to be used to clear IRQSTAT bits */
232 writel(~0U, port->base + PINCTRL_IRQSTAT(port->id) + MXS_CLR);
233
234 /* gpio-mxs can be a generic irq chip */
235 mxs_gpio_init_gc(port);
236
237 /* setup one handler for each entry */
238 irq_set_chained_handler(port->irq, mxs_gpio_irq_handler);
239 irq_set_handler_data(port->irq, port);
240
241 err = bgpio_init(&port->bgc, &pdev->dev, 4,
242 port->base + PINCTRL_DIN(port->id),
243 port->base + PINCTRL_DOUT(port->id), NULL,
244 port->base + PINCTRL_DOE(port->id), NULL, false);
245 if (err)
246 goto out_iounmap;
247
248 port->bgc.gc.to_irq = mxs_gpio_to_irq;
249 port->bgc.gc.base = port->id * 32;
250
251 err = gpiochip_add(&port->bgc.gc);
252 if (err)
253 goto out_bgpio_remove;
254
255 return 0;
256
257out_bgpio_remove:
258 bgpio_remove(&port->bgc);
259out_iounmap:
260 if (iores)
261 iounmap(port->base);
262out_release_mem:
263 if (iores)
264 release_mem_region(iores->start, resource_size(iores));
265out_kfree:
266 kfree(port);
267 dev_info(&pdev->dev, "%s failed with errno %d\n", __func__, err);
268 return err;
269}
270
271static struct platform_driver mxs_gpio_driver = {
272 .driver = {
273 .name = "gpio-mxs",
274 .owner = THIS_MODULE,
275 },
276 .probe = mxs_gpio_probe,
277};
278
279static int __init mxs_gpio_init(void)
280{
281 return platform_driver_register(&mxs_gpio_driver);
282}
283postcore_initcall(mxs_gpio_init);
284
285MODULE_AUTHOR("Freescale Semiconductor, "
286 "Daniel Mack <danielncaiaq.de>, "
287 "Juergen Beisert <kernel@pengutronix.de>");
288MODULE_DESCRIPTION("Freescale MXS GPIO");
289MODULE_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/init.h>
24#include <linux/interrupt.h>
25#include <linux/io.h>
26#include <linux/irq.h>
27#include <linux/gpio.h>
28#include <linux/of.h>
29#include <linux/of_address.h>
30#include <linux/of_device.h>
31#include <linux/platform_device.h>
32#include <linux/slab.h>
33#include <linux/basic_mmio_gpio.h>
34#include <linux/module.h>
35
36#define MXS_SET 0x4
37#define MXS_CLR 0x8
38
39#define PINCTRL_DOUT(p) ((is_imx23_gpio(p) ? 0x0500 : 0x0700) + (p->id) * 0x10)
40#define PINCTRL_DIN(p) ((is_imx23_gpio(p) ? 0x0600 : 0x0900) + (p->id) * 0x10)
41#define PINCTRL_DOE(p) ((is_imx23_gpio(p) ? 0x0700 : 0x0b00) + (p->id) * 0x10)
42#define PINCTRL_PIN2IRQ(p) ((is_imx23_gpio(p) ? 0x0800 : 0x1000) + (p->id) * 0x10)
43#define PINCTRL_IRQEN(p) ((is_imx23_gpio(p) ? 0x0900 : 0x1100) + (p->id) * 0x10)
44#define PINCTRL_IRQLEV(p) ((is_imx23_gpio(p) ? 0x0a00 : 0x1200) + (p->id) * 0x10)
45#define PINCTRL_IRQPOL(p) ((is_imx23_gpio(p) ? 0x0b00 : 0x1300) + (p->id) * 0x10)
46#define PINCTRL_IRQSTAT(p) ((is_imx23_gpio(p) ? 0x0c00 : 0x1400) + (p->id) * 0x10)
47
48#define GPIO_INT_FALL_EDGE 0x0
49#define GPIO_INT_LOW_LEV 0x1
50#define GPIO_INT_RISE_EDGE 0x2
51#define GPIO_INT_HIGH_LEV 0x3
52#define GPIO_INT_LEV_MASK (1 << 0)
53#define GPIO_INT_POL_MASK (1 << 1)
54
55#define irq_to_gpio(irq) ((irq) - MXS_GPIO_IRQ_START)
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 int virtual_irq_start;
67 struct bgpio_chip bgc;
68 enum mxs_gpio_id devid;
69};
70
71static inline int is_imx23_gpio(struct mxs_gpio_port *port)
72{
73 return port->devid == IMX23_GPIO;
74}
75
76static inline int is_imx28_gpio(struct mxs_gpio_port *port)
77{
78 return port->devid == IMX28_GPIO;
79}
80
81/* Note: This driver assumes 32 GPIOs are handled in one register */
82
83static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
84{
85 u32 gpio = irq_to_gpio(d->irq);
86 u32 pin_mask = 1 << (gpio & 31);
87 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
88 struct mxs_gpio_port *port = gc->private;
89 void __iomem *pin_addr;
90 int edge;
91
92 switch (type) {
93 case IRQ_TYPE_EDGE_RISING:
94 edge = GPIO_INT_RISE_EDGE;
95 break;
96 case IRQ_TYPE_EDGE_FALLING:
97 edge = GPIO_INT_FALL_EDGE;
98 break;
99 case IRQ_TYPE_LEVEL_LOW:
100 edge = GPIO_INT_LOW_LEV;
101 break;
102 case IRQ_TYPE_LEVEL_HIGH:
103 edge = GPIO_INT_HIGH_LEV;
104 break;
105 default:
106 return -EINVAL;
107 }
108
109 /* set level or edge */
110 pin_addr = port->base + PINCTRL_IRQLEV(port);
111 if (edge & GPIO_INT_LEV_MASK)
112 writel(pin_mask, pin_addr + MXS_SET);
113 else
114 writel(pin_mask, pin_addr + MXS_CLR);
115
116 /* set polarity */
117 pin_addr = port->base + PINCTRL_IRQPOL(port);
118 if (edge & GPIO_INT_POL_MASK)
119 writel(pin_mask, pin_addr + MXS_SET);
120 else
121 writel(pin_mask, pin_addr + MXS_CLR);
122
123 writel(1 << (gpio & 0x1f),
124 port->base + PINCTRL_IRQSTAT(port) + MXS_CLR);
125
126 return 0;
127}
128
129/* MXS has one interrupt *per* gpio port */
130static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc)
131{
132 u32 irq_stat;
133 struct mxs_gpio_port *port = irq_get_handler_data(irq);
134 u32 gpio_irq_no_base = port->virtual_irq_start;
135
136 desc->irq_data.chip->irq_ack(&desc->irq_data);
137
138 irq_stat = readl(port->base + PINCTRL_IRQSTAT(port)) &
139 readl(port->base + PINCTRL_IRQEN(port));
140
141 while (irq_stat != 0) {
142 int irqoffset = fls(irq_stat) - 1;
143 generic_handle_irq(gpio_irq_no_base + irqoffset);
144 irq_stat &= ~(1 << irqoffset);
145 }
146}
147
148/*
149 * Set interrupt number "irq" in the GPIO as a wake-up source.
150 * While system is running, all registered GPIO interrupts need to have
151 * wake-up enabled. When system is suspended, only selected GPIO interrupts
152 * need to have wake-up enabled.
153 * @param irq interrupt source number
154 * @param enable enable as wake-up if equal to non-zero
155 * @return This function returns 0 on success.
156 */
157static int mxs_gpio_set_wake_irq(struct irq_data *d, unsigned int enable)
158{
159 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
160 struct mxs_gpio_port *port = gc->private;
161
162 if (enable)
163 enable_irq_wake(port->irq);
164 else
165 disable_irq_wake(port->irq);
166
167 return 0;
168}
169
170static void __init mxs_gpio_init_gc(struct mxs_gpio_port *port)
171{
172 struct irq_chip_generic *gc;
173 struct irq_chip_type *ct;
174
175 gc = irq_alloc_generic_chip("gpio-mxs", 1, port->virtual_irq_start,
176 port->base, handle_level_irq);
177 gc->private = port;
178
179 ct = gc->chip_types;
180 ct->chip.irq_ack = irq_gc_ack_set_bit;
181 ct->chip.irq_mask = irq_gc_mask_clr_bit;
182 ct->chip.irq_unmask = irq_gc_mask_set_bit;
183 ct->chip.irq_set_type = mxs_gpio_set_irq_type;
184 ct->chip.irq_set_wake = mxs_gpio_set_wake_irq;
185 ct->regs.ack = PINCTRL_IRQSTAT(port) + MXS_CLR;
186 ct->regs.mask = PINCTRL_IRQEN(port);
187
188 irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0);
189}
190
191static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
192{
193 struct bgpio_chip *bgc = to_bgpio_chip(gc);
194 struct mxs_gpio_port *port =
195 container_of(bgc, struct mxs_gpio_port, bgc);
196
197 return port->virtual_irq_start + offset;
198}
199
200static struct platform_device_id mxs_gpio_ids[] = {
201 {
202 .name = "imx23-gpio",
203 .driver_data = IMX23_GPIO,
204 }, {
205 .name = "imx28-gpio",
206 .driver_data = IMX28_GPIO,
207 }, {
208 /* sentinel */
209 }
210};
211MODULE_DEVICE_TABLE(platform, mxs_gpio_ids);
212
213static const struct of_device_id mxs_gpio_dt_ids[] = {
214 { .compatible = "fsl,imx23-gpio", .data = (void *) IMX23_GPIO, },
215 { .compatible = "fsl,imx28-gpio", .data = (void *) IMX28_GPIO, },
216 { /* sentinel */ }
217};
218MODULE_DEVICE_TABLE(of, mxs_gpio_dt_ids);
219
220static int __devinit mxs_gpio_probe(struct platform_device *pdev)
221{
222 const struct of_device_id *of_id =
223 of_match_device(mxs_gpio_dt_ids, &pdev->dev);
224 struct device_node *np = pdev->dev.of_node;
225 struct device_node *parent;
226 static void __iomem *base;
227 struct mxs_gpio_port *port;
228 struct resource *iores = NULL;
229 int err;
230
231 port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
232 if (!port)
233 return -ENOMEM;
234
235 if (np) {
236 port->id = of_alias_get_id(np, "gpio");
237 if (port->id < 0)
238 return port->id;
239 port->devid = (enum mxs_gpio_id) of_id->data;
240 } else {
241 port->id = pdev->id;
242 port->devid = pdev->id_entry->driver_data;
243 }
244 port->virtual_irq_start = MXS_GPIO_IRQ_START + port->id * 32;
245
246 port->irq = platform_get_irq(pdev, 0);
247 if (port->irq < 0)
248 return port->irq;
249
250 /*
251 * map memory region only once, as all the gpio ports
252 * share the same one
253 */
254 if (!base) {
255 if (np) {
256 parent = of_get_parent(np);
257 base = of_iomap(parent, 0);
258 of_node_put(parent);
259 } else {
260 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
261 base = devm_request_and_ioremap(&pdev->dev, iores);
262 }
263 if (!base)
264 return -EADDRNOTAVAIL;
265 }
266 port->base = base;
267
268 /*
269 * select the pin interrupt functionality but initially
270 * disable the interrupts
271 */
272 writel(~0U, port->base + PINCTRL_PIN2IRQ(port));
273 writel(0, port->base + PINCTRL_IRQEN(port));
274
275 /* clear address has to be used to clear IRQSTAT bits */
276 writel(~0U, port->base + PINCTRL_IRQSTAT(port) + MXS_CLR);
277
278 /* gpio-mxs can be a generic irq chip */
279 mxs_gpio_init_gc(port);
280
281 /* setup one handler for each entry */
282 irq_set_chained_handler(port->irq, mxs_gpio_irq_handler);
283 irq_set_handler_data(port->irq, port);
284
285 err = bgpio_init(&port->bgc, &pdev->dev, 4,
286 port->base + PINCTRL_DIN(port),
287 port->base + PINCTRL_DOUT(port), NULL,
288 port->base + PINCTRL_DOE(port), NULL, 0);
289 if (err)
290 return err;
291
292 port->bgc.gc.to_irq = mxs_gpio_to_irq;
293 port->bgc.gc.base = port->id * 32;
294
295 err = gpiochip_add(&port->bgc.gc);
296 if (err) {
297 bgpio_remove(&port->bgc);
298 return err;
299 }
300
301 return 0;
302}
303
304static struct platform_driver mxs_gpio_driver = {
305 .driver = {
306 .name = "gpio-mxs",
307 .owner = THIS_MODULE,
308 .of_match_table = mxs_gpio_dt_ids,
309 },
310 .probe = mxs_gpio_probe,
311 .id_table = mxs_gpio_ids,
312};
313
314static int __init mxs_gpio_init(void)
315{
316 return platform_driver_register(&mxs_gpio_driver);
317}
318postcore_initcall(mxs_gpio_init);
319
320MODULE_AUTHOR("Freescale Semiconductor, "
321 "Daniel Mack <danielncaiaq.de>, "
322 "Juergen Beisert <kernel@pengutronix.de>");
323MODULE_DESCRIPTION("Freescale MXS GPIO");
324MODULE_LICENSE("GPL");