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
19static DEFINE_SPINLOCK(gpio_lock);
20
21struct 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 */
44static 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(&regs->wkup_ival) >> (7 - gpio)) & 1;
51
52	pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);
53
54	return ret;
55}
56
57static inline void
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(&regs->wkup_dvo, chip->shadow_dvo);
70}
71
72static void
73mpc52xx_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
86static 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(&regs->wkup_ddr, chip->shadow_ddr);
98
99	/* and enable the pin */
100	chip->shadow_gpioe |= 1 << (7 - gpio);
101	out_8(&regs->wkup_gpioe, chip->shadow_gpioe);
102
103	spin_unlock_irqrestore(&gpio_lock, flags);
104
105	return 0;
106}
107
108static int
109mpc52xx_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(&regs->wkup_ddr, chip->shadow_ddr);
123
124	/* Finally enable the pin */
125	chip->shadow_gpioe |= 1 << (7 - gpio);
126	out_8(&regs->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
135static 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(&regs->wkup_gpioe);
162	chip->shadow_ddr = in_8(&regs->wkup_ddr);
163	chip->shadow_dvo = in_8(&regs->wkup_dvo);
164
165	return 0;
166}
167
168static 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
175static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
176	{ .compatible = "fsl,mpc5200-gpio-wkup", },
177	{}
178};
179
180static 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 */
206static 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(&regs->simple_ival) >> (31 - gpio)) & 1;
213
214	return ret;
215}
216
217static inline void
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(&regs->simple_dvo, chip->shadow_dvo);
229}
230
231static void
232mpc52xx_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
245static 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(&regs->simple_ddr, chip->shadow_ddr);
257
258	/* and enable the pin */
259	chip->shadow_gpioe |= 1 << (31 - gpio);
260	out_be32(&regs->simple_gpioe, chip->shadow_gpioe);
261
262	spin_unlock_irqrestore(&gpio_lock, flags);
263
264	return 0;
265}
266
267static int
268mpc52xx_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(&regs->simple_ddr, chip->shadow_ddr);
283
284	/* Finally enable the pin */
285	chip->shadow_gpioe |= 1 << (31 - gpio);
286	out_be32(&regs->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
295static 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(&regs->simple_gpioe);
322	chip->shadow_ddr = in_be32(&regs->simple_ddr);
323	chip->shadow_dvo = in_be32(&regs->simple_dvo);
324
325	return 0;
326}
327
328static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
329	{ .compatible = "fsl,mpc5200-gpio", },
330	{}
331};
332
333static 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
342static struct platform_driver * const drivers[] = {
343	&mpc52xx_wkup_gpiochip_driver,
344	&mpc52xx_simple_gpiochip_driver,
345};
346
347static 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 */
353subsys_initcall(mpc52xx_gpio_init);
354
355static void __exit mpc52xx_gpio_exit(void)
356{
357	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
358}
359module_exit(mpc52xx_gpio_exit);
360
361MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
362MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
363MODULE_LICENSE("GPL v2");
364
365