tjh.dev
Linux kernel mirror (for testing)
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kernel
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linux
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(®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
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(®s->wkup_dvo, chip->shadow_dvo);
70}
71
72static int
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 return 0;
86}
87
88static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
89{
90 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
91 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
92 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
93 unsigned long flags;
94
95 spin_lock_irqsave(&gpio_lock, flags);
96
97 /* set the direction */
98 chip->shadow_ddr &= ~(1 << (7 - gpio));
99 out_8(®s->wkup_ddr, chip->shadow_ddr);
100
101 /* and enable the pin */
102 chip->shadow_gpioe |= 1 << (7 - gpio);
103 out_8(®s->wkup_gpioe, chip->shadow_gpioe);
104
105 spin_unlock_irqrestore(&gpio_lock, flags);
106
107 return 0;
108}
109
110static int
111mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
112{
113 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
114 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
115 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
116 unsigned long flags;
117
118 spin_lock_irqsave(&gpio_lock, flags);
119
120 __mpc52xx_wkup_gpio_set(gc, gpio, val);
121
122 /* Then set direction */
123 chip->shadow_ddr |= 1 << (7 - gpio);
124 out_8(®s->wkup_ddr, chip->shadow_ddr);
125
126 /* Finally enable the pin */
127 chip->shadow_gpioe |= 1 << (7 - gpio);
128 out_8(®s->wkup_gpioe, chip->shadow_gpioe);
129
130 spin_unlock_irqrestore(&gpio_lock, flags);
131
132 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
133
134 return 0;
135}
136
137static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev)
138{
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(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
145 if (!chip)
146 return -ENOMEM;
147
148 platform_set_drvdata(ofdev, chip);
149
150 gc = &chip->mmchip.gc;
151
152 gc->ngpio = 8;
153 gc->direction_input = mpc52xx_wkup_gpio_dir_in;
154 gc->direction_output = mpc52xx_wkup_gpio_dir_out;
155 gc->get = mpc52xx_wkup_gpio_get;
156 gc->set = mpc52xx_wkup_gpio_set;
157
158 ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip);
159 if (ret)
160 return ret;
161
162 regs = chip->mmchip.regs;
163 chip->shadow_gpioe = in_8(®s->wkup_gpioe);
164 chip->shadow_ddr = in_8(®s->wkup_ddr);
165 chip->shadow_dvo = in_8(®s->wkup_dvo);
166
167 return 0;
168}
169
170static void mpc52xx_gpiochip_remove(struct platform_device *ofdev)
171{
172 struct mpc52xx_gpiochip *chip = platform_get_drvdata(ofdev);
173
174 of_mm_gpiochip_remove(&chip->mmchip);
175}
176
177static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
178 { .compatible = "fsl,mpc5200-gpio-wkup", },
179 {}
180};
181
182static struct platform_driver mpc52xx_wkup_gpiochip_driver = {
183 .driver = {
184 .name = "mpc5200-gpio-wkup",
185 .of_match_table = mpc52xx_wkup_gpiochip_match,
186 },
187 .probe = mpc52xx_wkup_gpiochip_probe,
188 .remove = mpc52xx_gpiochip_remove,
189};
190
191/*
192 * GPIO LIB API implementation for simple GPIOs
193 *
194 * There's a maximum of 32 simple GPIOs. Which of these are available
195 * for use depends on your board setup.
196 * The numbering reflects the bit numbering in the port registers:
197 *
198 * 0..1 > reserved
199 * 2..3 > IRDA
200 * 4..7 > ETHR
201 * 8..11 > reserved
202 * 12..15 > USB
203 * 16..17 > reserved
204 * 18..23 > PSC3
205 * 24..27 > PSC2
206 * 28..31 > PSC1
207 */
208static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
209{
210 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
211 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
212 unsigned int ret;
213
214 ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1;
215
216 return ret;
217}
218
219static inline void
220__mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
221{
222 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
223 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
224 struct mpc52xx_gpio __iomem *regs = mm_gc->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
233static int
234mpc52xx_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
249static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
250{
251 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
252 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
253 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
254 unsigned long flags;
255
256 spin_lock_irqsave(&gpio_lock, flags);
257
258 /* set the direction */
259 chip->shadow_ddr &= ~(1 << (31 - gpio));
260 out_be32(®s->simple_ddr, chip->shadow_ddr);
261
262 /* and enable the pin */
263 chip->shadow_gpioe |= 1 << (31 - gpio);
264 out_be32(®s->simple_gpioe, chip->shadow_gpioe);
265
266 spin_unlock_irqrestore(&gpio_lock, flags);
267
268 return 0;
269}
270
271static int
272mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
273{
274 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
275 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
276 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
277 unsigned long flags;
278
279 spin_lock_irqsave(&gpio_lock, flags);
280
281 /* First set initial value */
282 __mpc52xx_simple_gpio_set(gc, gpio, val);
283
284 /* Then set direction */
285 chip->shadow_ddr |= 1 << (31 - gpio);
286 out_be32(®s->simple_ddr, chip->shadow_ddr);
287
288 /* Finally enable the pin */
289 chip->shadow_gpioe |= 1 << (31 - gpio);
290 out_be32(®s->simple_gpioe, chip->shadow_gpioe);
291
292 spin_unlock_irqrestore(&gpio_lock, flags);
293
294 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
295
296 return 0;
297}
298
299static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev)
300{
301 struct mpc52xx_gpiochip *chip;
302 struct gpio_chip *gc;
303 struct mpc52xx_gpio __iomem *regs;
304 int ret;
305
306 chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
307 if (!chip)
308 return -ENOMEM;
309
310 platform_set_drvdata(ofdev, chip);
311
312 gc = &chip->mmchip.gc;
313
314 gc->ngpio = 32;
315 gc->direction_input = mpc52xx_simple_gpio_dir_in;
316 gc->direction_output = mpc52xx_simple_gpio_dir_out;
317 gc->get = mpc52xx_simple_gpio_get;
318 gc->set = mpc52xx_simple_gpio_set;
319
320 ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip);
321 if (ret)
322 return ret;
323
324 regs = chip->mmchip.regs;
325 chip->shadow_gpioe = in_be32(®s->simple_gpioe);
326 chip->shadow_ddr = in_be32(®s->simple_ddr);
327 chip->shadow_dvo = in_be32(®s->simple_dvo);
328
329 return 0;
330}
331
332static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
333 { .compatible = "fsl,mpc5200-gpio", },
334 {}
335};
336
337static struct platform_driver mpc52xx_simple_gpiochip_driver = {
338 .driver = {
339 .name = "mpc5200-gpio",
340 .of_match_table = mpc52xx_simple_gpiochip_match,
341 },
342 .probe = mpc52xx_simple_gpiochip_probe,
343 .remove = mpc52xx_gpiochip_remove,
344};
345
346static struct platform_driver * const drivers[] = {
347 &mpc52xx_wkup_gpiochip_driver,
348 &mpc52xx_simple_gpiochip_driver,
349};
350
351static int __init mpc52xx_gpio_init(void)
352{
353 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
354}
355
356/* Make sure we get initialised before anyone else tries to use us */
357subsys_initcall(mpc52xx_gpio_init);
358
359static void __exit mpc52xx_gpio_exit(void)
360{
361 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
362}
363module_exit(mpc52xx_gpio_exit);
364
365MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
366MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
367MODULE_LICENSE("GPL v2");
368