1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * MPC52xx gpio driver
4 *
5 * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
6 */
7
8 #include <linux/of.h>
9 #include <linux/kernel.h>
10 #include <linux/slab.h>
11 #include <linux/gpio/driver.h>
12 #include <linux/io.h>
13 #include <linux/platform_device.h>
14 #include <linux/module.h>
15
16 #include <asm/mpc52xx.h>
17 #include <sysdev/fsl_soc.h>
18
19 static DEFINE_SPINLOCK(gpio_lock);
20
21 struct mpc52xx_gpiochip {
22 struct gpio_chip gc;
23 void __iomem *regs;
24 unsigned int shadow_dvo;
25 unsigned int shadow_gpioe;
26 unsigned int shadow_ddr;
27 };
28
29 /*
30 * GPIO LIB API implementation for wakeup GPIOs.
31 *
32 * There's a maximum of 8 wakeup GPIOs. Which of these are available
33 * for use depends on your board setup.
34 *
35 * 0 -> GPIO_WKUP_7
36 * 1 -> GPIO_WKUP_6
37 * 2 -> PSC6_1
38 * 3 -> PSC6_0
39 * 4 -> ETH_17
40 * 5 -> PSC3_9
41 * 6 -> PSC2_4
42 * 7 -> PSC1_4
43 *
44 */
mpc52xx_wkup_gpio_get(struct gpio_chip * gc,unsigned int gpio)45 static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio)
46 {
47 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
48 struct mpc52xx_gpio_wkup __iomem *regs = chip->regs;
49 unsigned int ret;
50
51 ret = (in_8(®s->wkup_ival) >> (7 - gpio)) & 1;
52
53 pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);
54
55 return ret;
56 }
57
58 static inline void
__mpc52xx_wkup_gpio_set(struct gpio_chip * gc,unsigned int gpio,int val)59 __mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
60 {
61 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
62 struct mpc52xx_gpio_wkup __iomem *regs = chip->regs;
63
64 if (val)
65 chip->shadow_dvo |= 1 << (7 - gpio);
66 else
67 chip->shadow_dvo &= ~(1 << (7 - gpio));
68
69 out_8(®s->wkup_dvo, chip->shadow_dvo);
70 }
71
72 static int
mpc52xx_wkup_gpio_set(struct gpio_chip * gc,unsigned int gpio,int val)73 mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
74 {
75 unsigned long flags;
76
77 spin_lock_irqsave(&gpio_lock, flags);
78
79 __mpc52xx_wkup_gpio_set(gc, gpio, val);
80
81 spin_unlock_irqrestore(&gpio_lock, flags);
82
83 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
84
85 return 0;
86 }
87
mpc52xx_wkup_gpio_dir_in(struct gpio_chip * gc,unsigned int gpio)88 static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
89 {
90 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
91 struct mpc52xx_gpio_wkup __iomem *regs = chip->regs;
92 unsigned long flags;
93
94 spin_lock_irqsave(&gpio_lock, flags);
95
96 /* set the direction */
97 chip->shadow_ddr &= ~(1 << (7 - gpio));
98 out_8(®s->wkup_ddr, chip->shadow_ddr);
99
100 /* and enable the pin */
101 chip->shadow_gpioe |= 1 << (7 - gpio);
102 out_8(®s->wkup_gpioe, chip->shadow_gpioe);
103
104 spin_unlock_irqrestore(&gpio_lock, flags);
105
106 return 0;
107 }
108
109 static int
mpc52xx_wkup_gpio_dir_out(struct gpio_chip * gc,unsigned int gpio,int val)110 mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
111 {
112 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
113 struct mpc52xx_gpio_wkup __iomem *regs = chip->regs;
114 unsigned long flags;
115
116 spin_lock_irqsave(&gpio_lock, flags);
117
118 __mpc52xx_wkup_gpio_set(gc, gpio, val);
119
120 /* Then set direction */
121 chip->shadow_ddr |= 1 << (7 - gpio);
122 out_8(®s->wkup_ddr, chip->shadow_ddr);
123
124 /* Finally enable the pin */
125 chip->shadow_gpioe |= 1 << (7 - gpio);
126 out_8(®s->wkup_gpioe, chip->shadow_gpioe);
127
128 spin_unlock_irqrestore(&gpio_lock, flags);
129
130 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
131
132 return 0;
133 }
134
mpc52xx_wkup_gpiochip_probe(struct platform_device * ofdev)135 static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev)
136 {
137 struct device *dev = &ofdev->dev;
138 struct device_node *np = dev->of_node;
139 struct mpc52xx_gpiochip *chip;
140 struct mpc52xx_gpio_wkup __iomem *regs;
141 struct gpio_chip *gc;
142 int ret;
143
144 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
145 if (!chip)
146 return -ENOMEM;
147
148 platform_set_drvdata(ofdev, chip);
149
150 gc = &chip->gc;
151
152 gc->base = -1;
153 gc->ngpio = 8;
154 gc->direction_input = mpc52xx_wkup_gpio_dir_in;
155 gc->direction_output = mpc52xx_wkup_gpio_dir_out;
156 gc->get = mpc52xx_wkup_gpio_get;
157 gc->set = mpc52xx_wkup_gpio_set;
158
159 gc->label = devm_kasprintf(dev, GFP_KERNEL, "%pOF", np);
160 if (!gc->label)
161 return -ENOMEM;
162
163 chip->regs = devm_of_iomap(dev, np, 0, NULL);
164 if (IS_ERR(chip->regs))
165 return PTR_ERR(chip->regs);
166
167 ret = devm_gpiochip_add_data(dev, gc, chip);
168 if (ret)
169 return ret;
170
171 regs = chip->regs;
172 chip->shadow_gpioe = in_8(®s->wkup_gpioe);
173 chip->shadow_ddr = in_8(®s->wkup_ddr);
174 chip->shadow_dvo = in_8(®s->wkup_dvo);
175
176 return 0;
177 }
178
179 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
180 { .compatible = "fsl,mpc5200-gpio-wkup", },
181 {}
182 };
183
184 static struct platform_driver mpc52xx_wkup_gpiochip_driver = {
185 .driver = {
186 .name = "mpc5200-gpio-wkup",
187 .of_match_table = mpc52xx_wkup_gpiochip_match,
188 },
189 .probe = mpc52xx_wkup_gpiochip_probe,
190 };
191
192 /*
193 * GPIO LIB API implementation for simple GPIOs
194 *
195 * There's a maximum of 32 simple GPIOs. Which of these are available
196 * for use depends on your board setup.
197 * The numbering reflects the bit numbering in the port registers:
198 *
199 * 0..1 > reserved
200 * 2..3 > IRDA
201 * 4..7 > ETHR
202 * 8..11 > reserved
203 * 12..15 > USB
204 * 16..17 > reserved
205 * 18..23 > PSC3
206 * 24..27 > PSC2
207 * 28..31 > PSC1
208 */
mpc52xx_simple_gpio_get(struct gpio_chip * gc,unsigned int gpio)209 static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
210 {
211 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
212 struct mpc52xx_gpio __iomem *regs = chip->regs;
213 unsigned int ret;
214
215 ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1;
216
217 return ret;
218 }
219
220 static inline void
__mpc52xx_simple_gpio_set(struct gpio_chip * gc,unsigned int gpio,int val)221 __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
222 {
223 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
224 struct mpc52xx_gpio __iomem *regs = chip->regs;
225
226 if (val)
227 chip->shadow_dvo |= 1 << (31 - gpio);
228 else
229 chip->shadow_dvo &= ~(1 << (31 - gpio));
230 out_be32(®s->simple_dvo, chip->shadow_dvo);
231 }
232
233 static int
mpc52xx_simple_gpio_set(struct gpio_chip * gc,unsigned int gpio,int val)234 mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
235 {
236 unsigned long flags;
237
238 spin_lock_irqsave(&gpio_lock, flags);
239
240 __mpc52xx_simple_gpio_set(gc, gpio, val);
241
242 spin_unlock_irqrestore(&gpio_lock, flags);
243
244 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
245
246 return 0;
247 }
248
mpc52xx_simple_gpio_dir_in(struct gpio_chip * gc,unsigned int gpio)249 static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
250 {
251 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
252 struct mpc52xx_gpio __iomem *regs = chip->regs;
253 unsigned long flags;
254
255 spin_lock_irqsave(&gpio_lock, flags);
256
257 /* set the direction */
258 chip->shadow_ddr &= ~(1 << (31 - gpio));
259 out_be32(®s->simple_ddr, chip->shadow_ddr);
260
261 /* and enable the pin */
262 chip->shadow_gpioe |= 1 << (31 - gpio);
263 out_be32(®s->simple_gpioe, chip->shadow_gpioe);
264
265 spin_unlock_irqrestore(&gpio_lock, flags);
266
267 return 0;
268 }
269
270 static int
mpc52xx_simple_gpio_dir_out(struct gpio_chip * gc,unsigned int gpio,int val)271 mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
272 {
273 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
274 struct mpc52xx_gpio __iomem *regs = chip->regs;
275 unsigned long flags;
276
277 spin_lock_irqsave(&gpio_lock, flags);
278
279 /* First set initial value */
280 __mpc52xx_simple_gpio_set(gc, gpio, val);
281
282 /* Then set direction */
283 chip->shadow_ddr |= 1 << (31 - gpio);
284 out_be32(®s->simple_ddr, chip->shadow_ddr);
285
286 /* Finally enable the pin */
287 chip->shadow_gpioe |= 1 << (31 - gpio);
288 out_be32(®s->simple_gpioe, chip->shadow_gpioe);
289
290 spin_unlock_irqrestore(&gpio_lock, flags);
291
292 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
293
294 return 0;
295 }
296
mpc52xx_simple_gpiochip_probe(struct platform_device * ofdev)297 static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev)
298 {
299 struct device *dev = &ofdev->dev;
300 struct device_node *np = dev->of_node;
301 struct mpc52xx_gpiochip *chip;
302 struct gpio_chip *gc;
303 struct mpc52xx_gpio __iomem *regs;
304 int ret;
305
306 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
307 if (!chip)
308 return -ENOMEM;
309
310 platform_set_drvdata(ofdev, chip);
311
312 gc = &chip->gc;
313
314 gc->base = -1;
315 gc->ngpio = 32;
316 gc->direction_input = mpc52xx_simple_gpio_dir_in;
317 gc->direction_output = mpc52xx_simple_gpio_dir_out;
318 gc->get = mpc52xx_simple_gpio_get;
319 gc->set = mpc52xx_simple_gpio_set;
320
321 gc->label = devm_kasprintf(dev, GFP_KERNEL, "%pOF", np);
322 if (!gc->label)
323 return -ENOMEM;
324
325 chip->regs = devm_of_iomap(dev, np, 0, NULL);
326 if (IS_ERR(chip->regs))
327 return PTR_ERR(chip->regs);
328
329 ret = devm_gpiochip_add_data(dev, gc, chip);
330 if (ret)
331 return ret;
332
333 regs = chip->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);
337
338 return 0;
339 }
340
341 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
342 { .compatible = "fsl,mpc5200-gpio", },
343 {}
344 };
345
346 static struct platform_driver mpc52xx_simple_gpiochip_driver = {
347 .driver = {
348 .name = "mpc5200-gpio",
349 .of_match_table = mpc52xx_simple_gpiochip_match,
350 },
351 .probe = mpc52xx_simple_gpiochip_probe,
352 };
353
354 static struct platform_driver * const drivers[] = {
355 &mpc52xx_wkup_gpiochip_driver,
356 &mpc52xx_simple_gpiochip_driver,
357 };
358
mpc52xx_gpio_init(void)359 static int __init mpc52xx_gpio_init(void)
360 {
361 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
362 }
363
364 /* Make sure we get initialised before anyone else tries to use us */
365 subsys_initcall(mpc52xx_gpio_init);
366
mpc52xx_gpio_exit(void)367 static void __exit mpc52xx_gpio_exit(void)
368 {
369 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
370 }
371 module_exit(mpc52xx_gpio_exit);
372
373 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
374 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
375 MODULE_LICENSE("GPL v2");
376
377