2 * SuperH Pin Function Controller GPIO driver.
4 * Copyright (C) 2008 Magnus Damm
5 * Copyright (C) 2009 - 2012 Paul Mundt
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file "COPYING" in the main directory of this archive
11 #define pr_fmt(fmt) "sh_pfc " KBUILD_MODNAME ": " fmt
13 #include <linux/init.h>
14 #include <linux/gpio.h>
15 #include <linux/slab.h>
16 #include <linux/spinlock.h>
17 #include <linux/module.h>
18 #include <linux/platform_device.h>
19 #include <linux/pinctrl/consumer.h>
23 struct gpio_chip gpio_chip;
26 static struct sh_pfc_chip *gpio_to_pfc_chip(struct gpio_chip *gc)
28 return container_of(gc, struct sh_pfc_chip, gpio_chip);
31 static struct sh_pfc *gpio_to_pfc(struct gpio_chip *gc)
33 return gpio_to_pfc_chip(gc)->pfc;
36 static int sh_gpio_request(struct gpio_chip *gc, unsigned offset)
38 return pinctrl_request_gpio(offset);
41 static void sh_gpio_free(struct gpio_chip *gc, unsigned offset)
43 pinctrl_free_gpio(offset);
46 static void sh_gpio_set_value(struct sh_pfc *pfc, unsigned gpio, int value)
48 struct pinmux_data_reg *dr = NULL;
51 if (!pfc || sh_pfc_get_data_reg(pfc, gpio, &dr, &bit) != 0)
54 sh_pfc_write_bit(dr, bit, value);
57 static int sh_gpio_get_value(struct sh_pfc *pfc, unsigned gpio)
59 struct pinmux_data_reg *dr = NULL;
62 if (!pfc || sh_pfc_get_data_reg(pfc, gpio, &dr, &bit) != 0)
65 return sh_pfc_read_bit(dr, bit);
68 static int sh_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
70 return pinctrl_gpio_direction_input(offset);
73 static int sh_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
76 sh_gpio_set_value(gpio_to_pfc(gc), offset, value);
78 return pinctrl_gpio_direction_output(offset);
81 static int sh_gpio_get(struct gpio_chip *gc, unsigned offset)
83 return sh_gpio_get_value(gpio_to_pfc(gc), offset);
86 static void sh_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
88 sh_gpio_set_value(gpio_to_pfc(gc), offset, value);
91 static int sh_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
93 struct sh_pfc *pfc = gpio_to_pfc(gc);
94 pinmux_enum_t enum_id;
95 pinmux_enum_t *enum_ids;
101 pos = sh_pfc_gpio_to_enum(pfc, offset, pos, &enum_id);
102 if (pos <= 0 || !enum_id)
105 for (i = 0; i < pfc->gpio_irq_size; i++) {
106 enum_ids = pfc->gpio_irq[i].enum_ids;
107 for (k = 0; enum_ids[k]; k++) {
108 if (enum_ids[k] == enum_id)
109 return pfc->gpio_irq[i].irq;
117 static void sh_pfc_gpio_setup(struct sh_pfc_chip *chip)
119 struct sh_pfc *pfc = chip->pfc;
120 struct gpio_chip *gc = &chip->gpio_chip;
122 gc->request = sh_gpio_request;
123 gc->free = sh_gpio_free;
124 gc->direction_input = sh_gpio_direction_input;
125 gc->get = sh_gpio_get;
126 gc->direction_output = sh_gpio_direction_output;
127 gc->set = sh_gpio_set;
128 gc->to_irq = sh_gpio_to_irq;
130 WARN_ON(pfc->first_gpio != 0); /* needs testing */
132 gc->label = pfc->name;
133 gc->owner = THIS_MODULE;
134 gc->base = pfc->first_gpio;
135 gc->ngpio = (pfc->last_gpio - pfc->first_gpio) + 1;
138 int sh_pfc_register_gpiochip(struct sh_pfc *pfc)
140 struct sh_pfc_chip *chip;
143 chip = kzalloc(sizeof(struct sh_pfc_chip), GFP_KERNEL);
149 sh_pfc_gpio_setup(chip);
151 ret = gpiochip_add(&chip->gpio_chip);
152 if (unlikely(ret < 0))
155 pr_info("%s handling gpio %d -> %d\n",
156 pfc->name, pfc->first_gpio, pfc->last_gpio);
160 EXPORT_SYMBOL_GPL(sh_pfc_register_gpiochip);
162 static int sh_pfc_gpio_match(struct gpio_chip *gc, void *data)
164 return !!strstr(gc->label, data);
167 static int __devinit sh_pfc_gpio_probe(struct platform_device *pdev)
169 struct sh_pfc_chip *chip;
170 struct gpio_chip *gc;
172 gc = gpiochip_find("_pfc", sh_pfc_gpio_match);
174 pr_err("Cant find gpio chip\n");
178 chip = gpio_to_pfc_chip(gc);
179 platform_set_drvdata(pdev, chip);
181 pr_info("attaching to GPIO chip %s\n", chip->pfc->name);
186 static int __devexit sh_pfc_gpio_remove(struct platform_device *pdev)
188 struct sh_pfc_chip *chip = platform_get_drvdata(pdev);
191 ret = gpiochip_remove(&chip->gpio_chip);
192 if (unlikely(ret < 0))
199 static struct platform_driver sh_pfc_gpio_driver = {
200 .probe = sh_pfc_gpio_probe,
201 .remove = __devexit_p(sh_pfc_gpio_remove),
203 .name = KBUILD_MODNAME,
204 .owner = THIS_MODULE,
208 static struct platform_device sh_pfc_gpio_device = {
209 .name = KBUILD_MODNAME,
213 static int __init sh_pfc_gpio_init(void)
217 rc = platform_driver_register(&sh_pfc_gpio_driver);
219 rc = platform_device_register(&sh_pfc_gpio_device);
221 platform_driver_unregister(&sh_pfc_gpio_driver);
227 static void __exit sh_pfc_gpio_exit(void)
229 platform_device_unregister(&sh_pfc_gpio_device);
230 platform_driver_unregister(&sh_pfc_gpio_driver);
233 module_init(sh_pfc_gpio_init);
234 module_exit(sh_pfc_gpio_exit);
236 MODULE_AUTHOR("Magnus Damm, Paul Mundt");
237 MODULE_DESCRIPTION("GPIO driver for SuperH pin function controller");
238 MODULE_LICENSE("GPL v2");
239 MODULE_ALIAS("platform:pfc-gpio");