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>
29 #include <asm/mpc52xx.h>
30 #include <sysdev/fsl_soc.h>
32 static DEFINE_SPINLOCK(gpio_lock);
34 struct mpc52xx_gpiochip {
35 struct of_mm_gpio_chip mmchip;
36 unsigned int shadow_dvo;
37 unsigned int shadow_gpioe;
38 unsigned int shadow_ddr;
42 * GPIO LIB API implementation for wakeup GPIOs.
44 * There's a maximum of 8 wakeup GPIOs. Which of these are available
45 * for use depends on your board setup.
57 static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio)
59 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
60 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
63 ret = (in_8(®s->wkup_ival) >> (7 - gpio)) & 1;
65 pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);
71 __mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
73 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
74 struct mpc52xx_gpiochip *chip = container_of(mm_gc,
75 struct mpc52xx_gpiochip, mmchip);
76 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
79 chip->shadow_dvo |= 1 << (7 - gpio);
81 chip->shadow_dvo &= ~(1 << (7 - gpio));
83 out_8(®s->wkup_dvo, chip->shadow_dvo);
87 mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
91 spin_lock_irqsave(&gpio_lock, flags);
93 __mpc52xx_wkup_gpio_set(gc, gpio, val);
95 spin_unlock_irqrestore(&gpio_lock, flags);
97 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
100 static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
102 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
103 struct mpc52xx_gpiochip *chip = container_of(mm_gc,
104 struct mpc52xx_gpiochip, mmchip);
105 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
108 spin_lock_irqsave(&gpio_lock, flags);
110 /* set the direction */
111 chip->shadow_ddr &= ~(1 << (7 - gpio));
112 out_8(®s->wkup_ddr, chip->shadow_ddr);
114 /* and enable the pin */
115 chip->shadow_gpioe |= 1 << (7 - gpio);
116 out_8(®s->wkup_gpioe, chip->shadow_gpioe);
118 spin_unlock_irqrestore(&gpio_lock, flags);
124 mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
126 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
127 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
128 struct mpc52xx_gpiochip *chip = container_of(mm_gc,
129 struct mpc52xx_gpiochip, mmchip);
132 spin_lock_irqsave(&gpio_lock, flags);
134 __mpc52xx_wkup_gpio_set(gc, gpio, val);
136 /* Then set direction */
137 chip->shadow_ddr |= 1 << (7 - gpio);
138 out_8(®s->wkup_ddr, chip->shadow_ddr);
140 /* Finally enable the pin */
141 chip->shadow_gpioe |= 1 << (7 - gpio);
142 out_8(®s->wkup_gpioe, chip->shadow_gpioe);
144 spin_unlock_irqrestore(&gpio_lock, flags);
146 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
151 static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev)
153 struct mpc52xx_gpiochip *chip;
154 struct mpc52xx_gpio_wkup __iomem *regs;
155 struct gpio_chip *gc;
158 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
162 gc = &chip->mmchip.gc;
165 gc->direction_input = mpc52xx_wkup_gpio_dir_in;
166 gc->direction_output = mpc52xx_wkup_gpio_dir_out;
167 gc->get = mpc52xx_wkup_gpio_get;
168 gc->set = mpc52xx_wkup_gpio_set;
170 ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
174 regs = chip->mmchip.regs;
175 chip->shadow_gpioe = in_8(®s->wkup_gpioe);
176 chip->shadow_ddr = in_8(®s->wkup_ddr);
177 chip->shadow_dvo = in_8(®s->wkup_dvo);
182 static int mpc52xx_gpiochip_remove(struct platform_device *ofdev)
187 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
188 { .compatible = "fsl,mpc5200-gpio-wkup", },
192 static struct platform_driver mpc52xx_wkup_gpiochip_driver = {
194 .name = "mpc5200-gpio-wkup",
195 .of_match_table = mpc52xx_wkup_gpiochip_match,
197 .probe = mpc52xx_wkup_gpiochip_probe,
198 .remove = mpc52xx_gpiochip_remove,
202 * GPIO LIB API implementation for simple GPIOs
204 * There's a maximum of 32 simple GPIOs. Which of these are available
205 * for use depends on your board setup.
206 * The numbering reflects the bit numbering in the port registers:
218 static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
220 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
221 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
224 ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1;
230 __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
232 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
233 struct mpc52xx_gpiochip *chip = container_of(mm_gc,
234 struct mpc52xx_gpiochip, mmchip);
235 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
238 chip->shadow_dvo |= 1 << (31 - gpio);
240 chip->shadow_dvo &= ~(1 << (31 - gpio));
241 out_be32(®s->simple_dvo, chip->shadow_dvo);
245 mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
249 spin_lock_irqsave(&gpio_lock, flags);
251 __mpc52xx_simple_gpio_set(gc, gpio, val);
253 spin_unlock_irqrestore(&gpio_lock, flags);
255 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
258 static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
260 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
261 struct mpc52xx_gpiochip *chip = container_of(mm_gc,
262 struct mpc52xx_gpiochip, mmchip);
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 = container_of(mm_gc,
286 struct mpc52xx_gpiochip, mmchip);
287 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
290 spin_lock_irqsave(&gpio_lock, flags);
292 /* First set initial value */
293 __mpc52xx_simple_gpio_set(gc, gpio, val);
295 /* Then set direction */
296 chip->shadow_ddr |= 1 << (31 - gpio);
297 out_be32(®s->simple_ddr, chip->shadow_ddr);
299 /* Finally enable the pin */
300 chip->shadow_gpioe |= 1 << (31 - gpio);
301 out_be32(®s->simple_gpioe, chip->shadow_gpioe);
303 spin_unlock_irqrestore(&gpio_lock, flags);
305 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
310 static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev)
312 struct mpc52xx_gpiochip *chip;
313 struct gpio_chip *gc;
314 struct mpc52xx_gpio __iomem *regs;
317 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
321 gc = &chip->mmchip.gc;
324 gc->direction_input = mpc52xx_simple_gpio_dir_in;
325 gc->direction_output = mpc52xx_simple_gpio_dir_out;
326 gc->get = mpc52xx_simple_gpio_get;
327 gc->set = mpc52xx_simple_gpio_set;
329 ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
333 regs = chip->mmchip.regs;
334 chip->shadow_gpioe = in_be32(®s->simple_gpioe);
335 chip->shadow_ddr = in_be32(®s->simple_ddr);
336 chip->shadow_dvo = in_be32(®s->simple_dvo);
341 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
342 { .compatible = "fsl,mpc5200-gpio", },
346 static struct platform_driver mpc52xx_simple_gpiochip_driver = {
348 .name = "mpc5200-gpio",
349 .of_match_table = mpc52xx_simple_gpiochip_match,
351 .probe = mpc52xx_simple_gpiochip_probe,
352 .remove = mpc52xx_gpiochip_remove,
355 static int __init mpc52xx_gpio_init(void)
357 if (platform_driver_register(&mpc52xx_wkup_gpiochip_driver))
358 printk(KERN_ERR "Unable to register wakeup GPIO driver\n");
360 if (platform_driver_register(&mpc52xx_simple_gpiochip_driver))
361 printk(KERN_ERR "Unable to register simple GPIO driver\n");
367 /* Make sure we get initialised before anyone else tries to use us */
368 subsys_initcall(mpc52xx_gpio_init);
370 /* No exit call at the moment as we cannot unregister of gpio chips */
372 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
374 MODULE_LICENSE("GPL v2");