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>
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 = container_of(mm_gc,
74 struct mpc52xx_gpiochip, mmchip);
75 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
78 chip->shadow_dvo |= 1 << (7 - gpio);
80 chip->shadow_dvo &= ~(1 << (7 - gpio));
82 out_8(®s->wkup_dvo, chip->shadow_dvo);
86 mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
90 spin_lock_irqsave(&gpio_lock, flags);
92 __mpc52xx_wkup_gpio_set(gc, gpio, val);
94 spin_unlock_irqrestore(&gpio_lock, flags);
96 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
99 static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
101 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
102 struct mpc52xx_gpiochip *chip = container_of(mm_gc,
103 struct mpc52xx_gpiochip, mmchip);
104 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
107 spin_lock_irqsave(&gpio_lock, flags);
109 /* set the direction */
110 chip->shadow_ddr &= ~(1 << (7 - gpio));
111 out_8(®s->wkup_ddr, chip->shadow_ddr);
113 /* and enable the pin */
114 chip->shadow_gpioe |= 1 << (7 - gpio);
115 out_8(®s->wkup_gpioe, chip->shadow_gpioe);
117 spin_unlock_irqrestore(&gpio_lock, flags);
123 mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
125 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
126 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
127 struct mpc52xx_gpiochip *chip = container_of(mm_gc,
128 struct mpc52xx_gpiochip, mmchip);
131 spin_lock_irqsave(&gpio_lock, flags);
133 __mpc52xx_wkup_gpio_set(gc, gpio, val);
135 /* Then set direction */
136 chip->shadow_ddr |= 1 << (7 - gpio);
137 out_8(®s->wkup_ddr, chip->shadow_ddr);
139 /* Finally enable the pin */
140 chip->shadow_gpioe |= 1 << (7 - gpio);
141 out_8(®s->wkup_gpioe, chip->shadow_gpioe);
143 spin_unlock_irqrestore(&gpio_lock, flags);
145 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
150 static int __devinit mpc52xx_wkup_gpiochip_probe(struct of_device *ofdev,
151 const struct of_device_id *match)
153 struct mpc52xx_gpiochip *chip;
154 struct mpc52xx_gpio_wkup __iomem *regs;
155 struct of_gpio_chip *ofchip;
158 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
162 ofchip = &chip->mmchip.of_gc;
164 ofchip->gpio_cells = 2;
165 ofchip->gc.ngpio = 8;
166 ofchip->gc.direction_input = mpc52xx_wkup_gpio_dir_in;
167 ofchip->gc.direction_output = mpc52xx_wkup_gpio_dir_out;
168 ofchip->gc.get = mpc52xx_wkup_gpio_get;
169 ofchip->gc.set = mpc52xx_wkup_gpio_set;
171 ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
175 regs = chip->mmchip.regs;
176 chip->shadow_gpioe = in_8(®s->wkup_gpioe);
177 chip->shadow_ddr = in_8(®s->wkup_ddr);
178 chip->shadow_dvo = in_8(®s->wkup_dvo);
183 static int mpc52xx_gpiochip_remove(struct of_device *ofdev)
188 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
190 .compatible = "fsl,mpc5200-gpio-wkup",
195 static struct of_platform_driver mpc52xx_wkup_gpiochip_driver = {
198 .owner = THIS_MODULE,
199 .of_match_table = mpc52xx_wkup_gpiochip_match,
201 .probe = mpc52xx_wkup_gpiochip_probe,
202 .remove = mpc52xx_gpiochip_remove,
206 * GPIO LIB API implementation for simple GPIOs
208 * There's a maximum of 32 simple GPIOs. Which of these are available
209 * for use depends on your board setup.
210 * The numbering reflects the bit numbering in the port registers:
222 static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
224 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
225 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
228 ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1;
234 __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
236 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
237 struct mpc52xx_gpiochip *chip = container_of(mm_gc,
238 struct mpc52xx_gpiochip, mmchip);
239 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
242 chip->shadow_dvo |= 1 << (31 - gpio);
244 chip->shadow_dvo &= ~(1 << (31 - gpio));
245 out_be32(®s->simple_dvo, chip->shadow_dvo);
249 mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
253 spin_lock_irqsave(&gpio_lock, flags);
255 __mpc52xx_simple_gpio_set(gc, gpio, val);
257 spin_unlock_irqrestore(&gpio_lock, flags);
259 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
262 static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
264 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
265 struct mpc52xx_gpiochip *chip = container_of(mm_gc,
266 struct mpc52xx_gpiochip, mmchip);
267 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
270 spin_lock_irqsave(&gpio_lock, flags);
272 /* set the direction */
273 chip->shadow_ddr &= ~(1 << (31 - gpio));
274 out_be32(®s->simple_ddr, chip->shadow_ddr);
276 /* and enable the pin */
277 chip->shadow_gpioe |= 1 << (31 - gpio);
278 out_be32(®s->simple_gpioe, chip->shadow_gpioe);
280 spin_unlock_irqrestore(&gpio_lock, flags);
286 mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
288 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
289 struct mpc52xx_gpiochip *chip = container_of(mm_gc,
290 struct mpc52xx_gpiochip, mmchip);
291 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
294 spin_lock_irqsave(&gpio_lock, flags);
296 /* First set initial value */
297 __mpc52xx_simple_gpio_set(gc, gpio, val);
299 /* Then set direction */
300 chip->shadow_ddr |= 1 << (31 - gpio);
301 out_be32(®s->simple_ddr, chip->shadow_ddr);
303 /* Finally enable the pin */
304 chip->shadow_gpioe |= 1 << (31 - gpio);
305 out_be32(®s->simple_gpioe, chip->shadow_gpioe);
307 spin_unlock_irqrestore(&gpio_lock, flags);
309 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
314 static int __devinit mpc52xx_simple_gpiochip_probe(struct of_device *ofdev,
315 const struct of_device_id *match)
317 struct mpc52xx_gpiochip *chip;
318 struct of_gpio_chip *ofchip;
319 struct mpc52xx_gpio __iomem *regs;
322 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
326 ofchip = &chip->mmchip.of_gc;
328 ofchip->gpio_cells = 2;
329 ofchip->gc.ngpio = 32;
330 ofchip->gc.direction_input = mpc52xx_simple_gpio_dir_in;
331 ofchip->gc.direction_output = mpc52xx_simple_gpio_dir_out;
332 ofchip->gc.get = mpc52xx_simple_gpio_get;
333 ofchip->gc.set = mpc52xx_simple_gpio_set;
335 ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
339 regs = chip->mmchip.regs;
340 chip->shadow_gpioe = in_be32(®s->simple_gpioe);
341 chip->shadow_ddr = in_be32(®s->simple_ddr);
342 chip->shadow_dvo = in_be32(®s->simple_dvo);
347 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
349 .compatible = "fsl,mpc5200-gpio",
354 static struct of_platform_driver mpc52xx_simple_gpiochip_driver = {
357 .owner = THIS_MODULE,
358 .of_match_table = mpc52xx_simple_gpiochip_match,
360 .probe = mpc52xx_simple_gpiochip_probe,
361 .remove = mpc52xx_gpiochip_remove,
364 static int __init mpc52xx_gpio_init(void)
366 if (of_register_platform_driver(&mpc52xx_wkup_gpiochip_driver))
367 printk(KERN_ERR "Unable to register wakeup GPIO driver\n");
369 if (of_register_platform_driver(&mpc52xx_simple_gpiochip_driver))
370 printk(KERN_ERR "Unable to register simple GPIO driver\n");
376 /* Make sure we get initialised before anyone else tries to use us */
377 subsys_initcall(mpc52xx_gpio_init);
379 /* No exit call at the moment as we cannot unregister of gpio chips */
381 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
382 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
383 MODULE_LICENSE("GPL v2");