4 * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <linux/kernel.h>
22 #include <linux/slab.h>
23 #include <linux/of_gpio.h>
25 #include <linux/of_platform.h>
26 #include <linux/module.h>
28 #include <asm/mpc52xx.h>
29 #include <sysdev/fsl_soc.h>
31 static DEFINE_SPINLOCK(gpio_lock);
33 struct mpc52xx_gpiochip {
34 struct of_mm_gpio_chip mmchip;
35 unsigned int shadow_dvo;
36 unsigned int shadow_gpioe;
37 unsigned int shadow_ddr;
41 * GPIO LIB API implementation for wakeup GPIOs.
43 * There's a maximum of 8 wakeup GPIOs. Which of these are available
44 * for use depends on your board setup.
56 static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio)
58 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
59 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
62 ret = (in_8(®s->wkup_ival) >> (7 - gpio)) & 1;
64 pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);
70 __mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
72 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
73 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
74 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
77 chip->shadow_dvo |= 1 << (7 - gpio);
79 chip->shadow_dvo &= ~(1 << (7 - gpio));
81 out_8(®s->wkup_dvo, chip->shadow_dvo);
85 mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
89 spin_lock_irqsave(&gpio_lock, flags);
91 __mpc52xx_wkup_gpio_set(gc, gpio, val);
93 spin_unlock_irqrestore(&gpio_lock, flags);
95 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
98 static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
100 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
101 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
102 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
105 spin_lock_irqsave(&gpio_lock, flags);
107 /* set the direction */
108 chip->shadow_ddr &= ~(1 << (7 - gpio));
109 out_8(®s->wkup_ddr, chip->shadow_ddr);
111 /* and enable the pin */
112 chip->shadow_gpioe |= 1 << (7 - gpio);
113 out_8(®s->wkup_gpioe, chip->shadow_gpioe);
115 spin_unlock_irqrestore(&gpio_lock, flags);
121 mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
123 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
124 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
125 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
128 spin_lock_irqsave(&gpio_lock, flags);
130 __mpc52xx_wkup_gpio_set(gc, gpio, val);
132 /* Then set direction */
133 chip->shadow_ddr |= 1 << (7 - gpio);
134 out_8(®s->wkup_ddr, chip->shadow_ddr);
136 /* Finally enable the pin */
137 chip->shadow_gpioe |= 1 << (7 - gpio);
138 out_8(®s->wkup_gpioe, chip->shadow_gpioe);
140 spin_unlock_irqrestore(&gpio_lock, flags);
142 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
147 static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev)
149 struct mpc52xx_gpiochip *chip;
150 struct mpc52xx_gpio_wkup __iomem *regs;
151 struct gpio_chip *gc;
154 chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
158 platform_set_drvdata(ofdev, chip);
160 gc = &chip->mmchip.gc;
163 gc->direction_input = mpc52xx_wkup_gpio_dir_in;
164 gc->direction_output = mpc52xx_wkup_gpio_dir_out;
165 gc->get = mpc52xx_wkup_gpio_get;
166 gc->set = mpc52xx_wkup_gpio_set;
168 ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip);
172 regs = chip->mmchip.regs;
173 chip->shadow_gpioe = in_8(®s->wkup_gpioe);
174 chip->shadow_ddr = in_8(®s->wkup_ddr);
175 chip->shadow_dvo = in_8(®s->wkup_dvo);
180 static int mpc52xx_gpiochip_remove(struct platform_device *ofdev)
182 struct mpc52xx_gpiochip *chip = platform_get_drvdata(ofdev);
184 of_mm_gpiochip_remove(&chip->mmchip);
189 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
190 { .compatible = "fsl,mpc5200-gpio-wkup", },
194 static struct platform_driver mpc52xx_wkup_gpiochip_driver = {
196 .name = "mpc5200-gpio-wkup",
197 .of_match_table = mpc52xx_wkup_gpiochip_match,
199 .probe = mpc52xx_wkup_gpiochip_probe,
200 .remove = mpc52xx_gpiochip_remove,
204 * GPIO LIB API implementation for simple GPIOs
206 * There's a maximum of 32 simple GPIOs. Which of these are available
207 * for use depends on your board setup.
208 * The numbering reflects the bit numbering in the port registers:
220 static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
222 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
223 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
226 ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1;
232 __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
234 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
235 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
236 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
239 chip->shadow_dvo |= 1 << (31 - gpio);
241 chip->shadow_dvo &= ~(1 << (31 - gpio));
242 out_be32(®s->simple_dvo, chip->shadow_dvo);
246 mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
250 spin_lock_irqsave(&gpio_lock, flags);
252 __mpc52xx_simple_gpio_set(gc, gpio, val);
254 spin_unlock_irqrestore(&gpio_lock, flags);
256 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
259 static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
261 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
262 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
263 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
266 spin_lock_irqsave(&gpio_lock, flags);
268 /* set the direction */
269 chip->shadow_ddr &= ~(1 << (31 - gpio));
270 out_be32(®s->simple_ddr, chip->shadow_ddr);
272 /* and enable the pin */
273 chip->shadow_gpioe |= 1 << (31 - gpio);
274 out_be32(®s->simple_gpioe, chip->shadow_gpioe);
276 spin_unlock_irqrestore(&gpio_lock, flags);
282 mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
284 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
285 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
286 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
289 spin_lock_irqsave(&gpio_lock, flags);
291 /* First set initial value */
292 __mpc52xx_simple_gpio_set(gc, gpio, val);
294 /* Then set direction */
295 chip->shadow_ddr |= 1 << (31 - gpio);
296 out_be32(®s->simple_ddr, chip->shadow_ddr);
298 /* Finally enable the pin */
299 chip->shadow_gpioe |= 1 << (31 - gpio);
300 out_be32(®s->simple_gpioe, chip->shadow_gpioe);
302 spin_unlock_irqrestore(&gpio_lock, flags);
304 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
309 static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev)
311 struct mpc52xx_gpiochip *chip;
312 struct gpio_chip *gc;
313 struct mpc52xx_gpio __iomem *regs;
316 chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
320 platform_set_drvdata(ofdev, chip);
322 gc = &chip->mmchip.gc;
325 gc->direction_input = mpc52xx_simple_gpio_dir_in;
326 gc->direction_output = mpc52xx_simple_gpio_dir_out;
327 gc->get = mpc52xx_simple_gpio_get;
328 gc->set = mpc52xx_simple_gpio_set;
330 ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip);
334 regs = chip->mmchip.regs;
335 chip->shadow_gpioe = in_be32(®s->simple_gpioe);
336 chip->shadow_ddr = in_be32(®s->simple_ddr);
337 chip->shadow_dvo = in_be32(®s->simple_dvo);
342 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
343 { .compatible = "fsl,mpc5200-gpio", },
347 static struct platform_driver mpc52xx_simple_gpiochip_driver = {
349 .name = "mpc5200-gpio",
350 .of_match_table = mpc52xx_simple_gpiochip_match,
352 .probe = mpc52xx_simple_gpiochip_probe,
353 .remove = mpc52xx_gpiochip_remove,
356 static struct platform_driver * const drivers[] = {
357 &mpc52xx_wkup_gpiochip_driver,
358 &mpc52xx_simple_gpiochip_driver,
361 static int __init mpc52xx_gpio_init(void)
363 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
366 /* Make sure we get initialised before anyone else tries to use us */
367 subsys_initcall(mpc52xx_gpio_init);
369 static void __exit mpc52xx_gpio_exit(void)
371 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
373 module_exit(mpc52xx_gpio_exit);
375 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
376 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
377 MODULE_LICENSE("GPL v2");