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 platform_device *ofdev)
152 struct mpc52xx_gpiochip *chip;
153 struct mpc52xx_gpio_wkup __iomem *regs;
154 struct gpio_chip *gc;
157 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
161 gc = &chip->mmchip.gc;
164 gc->direction_input = mpc52xx_wkup_gpio_dir_in;
165 gc->direction_output = mpc52xx_wkup_gpio_dir_out;
166 gc->get = mpc52xx_wkup_gpio_get;
167 gc->set = mpc52xx_wkup_gpio_set;
169 ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
173 regs = chip->mmchip.regs;
174 chip->shadow_gpioe = in_8(®s->wkup_gpioe);
175 chip->shadow_ddr = in_8(®s->wkup_ddr);
176 chip->shadow_dvo = in_8(®s->wkup_dvo);
181 static int mpc52xx_gpiochip_remove(struct platform_device *ofdev)
186 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
188 .compatible = "fsl,mpc5200-gpio-wkup",
193 static struct platform_driver mpc52xx_wkup_gpiochip_driver = {
196 .owner = THIS_MODULE,
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 = container_of(mm_gc,
236 struct mpc52xx_gpiochip, mmchip);
237 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
240 chip->shadow_dvo |= 1 << (31 - gpio);
242 chip->shadow_dvo &= ~(1 << (31 - gpio));
243 out_be32(®s->simple_dvo, chip->shadow_dvo);
247 mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
251 spin_lock_irqsave(&gpio_lock, flags);
253 __mpc52xx_simple_gpio_set(gc, gpio, val);
255 spin_unlock_irqrestore(&gpio_lock, flags);
257 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
260 static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
262 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
263 struct mpc52xx_gpiochip *chip = container_of(mm_gc,
264 struct mpc52xx_gpiochip, mmchip);
265 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
268 spin_lock_irqsave(&gpio_lock, flags);
270 /* set the direction */
271 chip->shadow_ddr &= ~(1 << (31 - gpio));
272 out_be32(®s->simple_ddr, chip->shadow_ddr);
274 /* and enable the pin */
275 chip->shadow_gpioe |= 1 << (31 - gpio);
276 out_be32(®s->simple_gpioe, chip->shadow_gpioe);
278 spin_unlock_irqrestore(&gpio_lock, flags);
284 mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
286 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
287 struct mpc52xx_gpiochip *chip = container_of(mm_gc,
288 struct mpc52xx_gpiochip, mmchip);
289 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
292 spin_lock_irqsave(&gpio_lock, flags);
294 /* First set initial value */
295 __mpc52xx_simple_gpio_set(gc, gpio, val);
297 /* Then set direction */
298 chip->shadow_ddr |= 1 << (31 - gpio);
299 out_be32(®s->simple_ddr, chip->shadow_ddr);
301 /* Finally enable the pin */
302 chip->shadow_gpioe |= 1 << (31 - gpio);
303 out_be32(®s->simple_gpioe, chip->shadow_gpioe);
305 spin_unlock_irqrestore(&gpio_lock, flags);
307 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
312 static int __devinit mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev)
314 struct mpc52xx_gpiochip *chip;
315 struct gpio_chip *gc;
316 struct mpc52xx_gpio __iomem *regs;
319 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
323 gc = &chip->mmchip.gc;
326 gc->direction_input = mpc52xx_simple_gpio_dir_in;
327 gc->direction_output = mpc52xx_simple_gpio_dir_out;
328 gc->get = mpc52xx_simple_gpio_get;
329 gc->set = mpc52xx_simple_gpio_set;
331 ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
335 regs = chip->mmchip.regs;
336 chip->shadow_gpioe = in_be32(®s->simple_gpioe);
337 chip->shadow_ddr = in_be32(®s->simple_ddr);
338 chip->shadow_dvo = in_be32(®s->simple_dvo);
343 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
345 .compatible = "fsl,mpc5200-gpio",
350 static struct platform_driver mpc52xx_simple_gpiochip_driver = {
353 .owner = THIS_MODULE,
354 .of_match_table = mpc52xx_simple_gpiochip_match,
356 .probe = mpc52xx_simple_gpiochip_probe,
357 .remove = mpc52xx_gpiochip_remove,
360 static int __init mpc52xx_gpio_init(void)
362 if (platform_driver_register(&mpc52xx_wkup_gpiochip_driver))
363 printk(KERN_ERR "Unable to register wakeup GPIO driver\n");
365 if (platform_driver_register(&mpc52xx_simple_gpiochip_driver))
366 printk(KERN_ERR "Unable to register simple GPIO driver\n");
372 /* Make sure we get initialised before anyone else tries to use us */
373 subsys_initcall(mpc52xx_gpio_init);
375 /* No exit call at the moment as we cannot unregister of gpio chips */
377 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
378 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
379 MODULE_LICENSE("GPL v2");