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/legacy-of-mm-gpiochip.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 of_mm_gpio_chip mmchip;
23 unsigned int shadow_dvo;
24 unsigned int shadow_gpioe;
25 unsigned int shadow_ddr;
26 };
27
28 /*
29 * GPIO LIB API implementation for wakeup GPIOs.
30 *
31 * There's a maximum of 8 wakeup GPIOs. Which of these are available
32 * for use depends on your board setup.
33 *
34 * 0 -> GPIO_WKUP_7
35 * 1 -> GPIO_WKUP_6
36 * 2 -> PSC6_1
37 * 3 -> PSC6_0
38 * 4 -> ETH_17
39 * 5 -> PSC3_9
40 * 6 -> PSC2_4
41 * 7 -> PSC1_4
42 *
43 */
mpc52xx_wkup_gpio_get(struct gpio_chip * gc,unsigned int gpio)44 static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio)
45 {
46 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
47 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
48 unsigned int ret;
49
50 ret = (in_8(®s->wkup_ival) >> (7 - gpio)) & 1;
51
52 pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);
53
54 return ret;
55 }
56
57 static inline void
__mpc52xx_wkup_gpio_set(struct gpio_chip * gc,unsigned int gpio,int val)58 __mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
59 {
60 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
61 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
62 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->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 void
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
mpc52xx_wkup_gpio_dir_in(struct gpio_chip * gc,unsigned int gpio)86 static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
87 {
88 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
89 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
90 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
91 unsigned long flags;
92
93 spin_lock_irqsave(&gpio_lock, flags);
94
95 /* set the direction */
96 chip->shadow_ddr &= ~(1 << (7 - gpio));
97 out_8(®s->wkup_ddr, chip->shadow_ddr);
98
99 /* and enable the pin */
100 chip->shadow_gpioe |= 1 << (7 - gpio);
101 out_8(®s->wkup_gpioe, chip->shadow_gpioe);
102
103 spin_unlock_irqrestore(&gpio_lock, flags);
104
105 return 0;
106 }
107
108 static int
mpc52xx_wkup_gpio_dir_out(struct gpio_chip * gc,unsigned int gpio,int val)109 mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
110 {
111 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
112 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
113 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
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 mpc52xx_gpiochip *chip;
138 struct mpc52xx_gpio_wkup __iomem *regs;
139 struct gpio_chip *gc;
140 int ret;
141
142 chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
143 if (!chip)
144 return -ENOMEM;
145
146 platform_set_drvdata(ofdev, chip);
147
148 gc = &chip->mmchip.gc;
149
150 gc->ngpio = 8;
151 gc->direction_input = mpc52xx_wkup_gpio_dir_in;
152 gc->direction_output = mpc52xx_wkup_gpio_dir_out;
153 gc->get = mpc52xx_wkup_gpio_get;
154 gc->set = mpc52xx_wkup_gpio_set;
155
156 ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip);
157 if (ret)
158 return ret;
159
160 regs = chip->mmchip.regs;
161 chip->shadow_gpioe = in_8(®s->wkup_gpioe);
162 chip->shadow_ddr = in_8(®s->wkup_ddr);
163 chip->shadow_dvo = in_8(®s->wkup_dvo);
164
165 return 0;
166 }
167
mpc52xx_gpiochip_remove(struct platform_device * ofdev)168 static void mpc52xx_gpiochip_remove(struct platform_device *ofdev)
169 {
170 struct mpc52xx_gpiochip *chip = platform_get_drvdata(ofdev);
171
172 of_mm_gpiochip_remove(&chip->mmchip);
173 }
174
175 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
176 { .compatible = "fsl,mpc5200-gpio-wkup", },
177 {}
178 };
179
180 static struct platform_driver mpc52xx_wkup_gpiochip_driver = {
181 .driver = {
182 .name = "mpc5200-gpio-wkup",
183 .of_match_table = mpc52xx_wkup_gpiochip_match,
184 },
185 .probe = mpc52xx_wkup_gpiochip_probe,
186 .remove_new = mpc52xx_gpiochip_remove,
187 };
188
189 /*
190 * GPIO LIB API implementation for simple GPIOs
191 *
192 * There's a maximum of 32 simple GPIOs. Which of these are available
193 * for use depends on your board setup.
194 * The numbering reflects the bit numbering in the port registers:
195 *
196 * 0..1 > reserved
197 * 2..3 > IRDA
198 * 4..7 > ETHR
199 * 8..11 > reserved
200 * 12..15 > USB
201 * 16..17 > reserved
202 * 18..23 > PSC3
203 * 24..27 > PSC2
204 * 28..31 > PSC1
205 */
mpc52xx_simple_gpio_get(struct gpio_chip * gc,unsigned int gpio)206 static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
207 {
208 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
209 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
210 unsigned int ret;
211
212 ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1;
213
214 return ret;
215 }
216
217 static inline void
__mpc52xx_simple_gpio_set(struct gpio_chip * gc,unsigned int gpio,int val)218 __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
219 {
220 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
221 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
222 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
223
224 if (val)
225 chip->shadow_dvo |= 1 << (31 - gpio);
226 else
227 chip->shadow_dvo &= ~(1 << (31 - gpio));
228 out_be32(®s->simple_dvo, chip->shadow_dvo);
229 }
230
231 static void
mpc52xx_simple_gpio_set(struct gpio_chip * gc,unsigned int gpio,int val)232 mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
233 {
234 unsigned long flags;
235
236 spin_lock_irqsave(&gpio_lock, flags);
237
238 __mpc52xx_simple_gpio_set(gc, gpio, val);
239
240 spin_unlock_irqrestore(&gpio_lock, flags);
241
242 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
243 }
244
mpc52xx_simple_gpio_dir_in(struct gpio_chip * gc,unsigned int gpio)245 static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
246 {
247 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
248 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
249 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
250 unsigned long flags;
251
252 spin_lock_irqsave(&gpio_lock, flags);
253
254 /* set the direction */
255 chip->shadow_ddr &= ~(1 << (31 - gpio));
256 out_be32(®s->simple_ddr, chip->shadow_ddr);
257
258 /* and enable the pin */
259 chip->shadow_gpioe |= 1 << (31 - gpio);
260 out_be32(®s->simple_gpioe, chip->shadow_gpioe);
261
262 spin_unlock_irqrestore(&gpio_lock, flags);
263
264 return 0;
265 }
266
267 static int
mpc52xx_simple_gpio_dir_out(struct gpio_chip * gc,unsigned int gpio,int val)268 mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
269 {
270 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
271 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
272 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
273 unsigned long flags;
274
275 spin_lock_irqsave(&gpio_lock, flags);
276
277 /* First set initial value */
278 __mpc52xx_simple_gpio_set(gc, gpio, val);
279
280 /* Then set direction */
281 chip->shadow_ddr |= 1 << (31 - gpio);
282 out_be32(®s->simple_ddr, chip->shadow_ddr);
283
284 /* Finally enable the pin */
285 chip->shadow_gpioe |= 1 << (31 - gpio);
286 out_be32(®s->simple_gpioe, chip->shadow_gpioe);
287
288 spin_unlock_irqrestore(&gpio_lock, flags);
289
290 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
291
292 return 0;
293 }
294
mpc52xx_simple_gpiochip_probe(struct platform_device * ofdev)295 static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev)
296 {
297 struct mpc52xx_gpiochip *chip;
298 struct gpio_chip *gc;
299 struct mpc52xx_gpio __iomem *regs;
300 int ret;
301
302 chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
303 if (!chip)
304 return -ENOMEM;
305
306 platform_set_drvdata(ofdev, chip);
307
308 gc = &chip->mmchip.gc;
309
310 gc->ngpio = 32;
311 gc->direction_input = mpc52xx_simple_gpio_dir_in;
312 gc->direction_output = mpc52xx_simple_gpio_dir_out;
313 gc->get = mpc52xx_simple_gpio_get;
314 gc->set = mpc52xx_simple_gpio_set;
315
316 ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip);
317 if (ret)
318 return ret;
319
320 regs = chip->mmchip.regs;
321 chip->shadow_gpioe = in_be32(®s->simple_gpioe);
322 chip->shadow_ddr = in_be32(®s->simple_ddr);
323 chip->shadow_dvo = in_be32(®s->simple_dvo);
324
325 return 0;
326 }
327
328 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
329 { .compatible = "fsl,mpc5200-gpio", },
330 {}
331 };
332
333 static struct platform_driver mpc52xx_simple_gpiochip_driver = {
334 .driver = {
335 .name = "mpc5200-gpio",
336 .of_match_table = mpc52xx_simple_gpiochip_match,
337 },
338 .probe = mpc52xx_simple_gpiochip_probe,
339 .remove_new = mpc52xx_gpiochip_remove,
340 };
341
342 static struct platform_driver * const drivers[] = {
343 &mpc52xx_wkup_gpiochip_driver,
344 &mpc52xx_simple_gpiochip_driver,
345 };
346
mpc52xx_gpio_init(void)347 static int __init mpc52xx_gpio_init(void)
348 {
349 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
350 }
351
352 /* Make sure we get initialised before anyone else tries to use us */
353 subsys_initcall(mpc52xx_gpio_init);
354
mpc52xx_gpio_exit(void)355 static void __exit mpc52xx_gpio_exit(void)
356 {
357 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
358 }
359 module_exit(mpc52xx_gpio_exit);
360
361 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
362 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
363 MODULE_LICENSE("GPL v2");
364
365