tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * MPC52xx gpio driver
3 *
4 * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/of.h>
21#include <linux/kernel.h>
22#include <linux/slab.h>
23#include <linux/of_gpio.h>
24#include <linux/io.h>
25#include <linux/of_platform.h>
26#include <linux/module.h>
27
28#include <asm/mpc52xx.h>
29#include <sysdev/fsl_soc.h>
30
31static DEFINE_SPINLOCK(gpio_lock);
32
33struct mpc52xx_gpiochip {
34 struct of_mm_gpio_chip mmchip;
35 unsigned int shadow_dvo;
36 unsigned int shadow_gpioe;
37 unsigned int shadow_ddr;
38};
39
40/*
41 * GPIO LIB API implementation for wakeup GPIOs.
42 *
43 * There's a maximum of 8 wakeup GPIOs. Which of these are available
44 * for use depends on your board setup.
45 *
46 * 0 -> GPIO_WKUP_7
47 * 1 -> GPIO_WKUP_6
48 * 2 -> PSC6_1
49 * 3 -> PSC6_0
50 * 4 -> ETH_17
51 * 5 -> PSC3_9
52 * 6 -> PSC2_4
53 * 7 -> PSC1_4
54 *
55 */
56static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio)
57{
58 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
59 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
60 unsigned int ret;
61
62 ret = (in_8(®s->wkup_ival) >> (7 - gpio)) & 1;
63
64 pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);
65
66 return ret;
67}
68
69static inline void
70__mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
71{
72 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
73 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
74 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
75
76 if (val)
77 chip->shadow_dvo |= 1 << (7 - gpio);
78 else
79 chip->shadow_dvo &= ~(1 << (7 - gpio));
80
81 out_8(®s->wkup_dvo, chip->shadow_dvo);
82}
83
84static void
85mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
86{
87 unsigned long flags;
88
89 spin_lock_irqsave(&gpio_lock, flags);
90
91 __mpc52xx_wkup_gpio_set(gc, gpio, val);
92
93 spin_unlock_irqrestore(&gpio_lock, flags);
94
95 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
96}
97
98static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
99{
100 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
101 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
102 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
103 unsigned long flags;
104
105 spin_lock_irqsave(&gpio_lock, flags);
106
107 /* set the direction */
108 chip->shadow_ddr &= ~(1 << (7 - gpio));
109 out_8(®s->wkup_ddr, chip->shadow_ddr);
110
111 /* and enable the pin */
112 chip->shadow_gpioe |= 1 << (7 - gpio);
113 out_8(®s->wkup_gpioe, chip->shadow_gpioe);
114
115 spin_unlock_irqrestore(&gpio_lock, flags);
116
117 return 0;
118}
119
120static int
121mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
122{
123 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
124 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
125 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
126 unsigned long flags;
127
128 spin_lock_irqsave(&gpio_lock, flags);
129
130 __mpc52xx_wkup_gpio_set(gc, gpio, val);
131
132 /* Then set direction */
133 chip->shadow_ddr |= 1 << (7 - gpio);
134 out_8(®s->wkup_ddr, chip->shadow_ddr);
135
136 /* Finally enable the pin */
137 chip->shadow_gpioe |= 1 << (7 - gpio);
138 out_8(®s->wkup_gpioe, chip->shadow_gpioe);
139
140 spin_unlock_irqrestore(&gpio_lock, flags);
141
142 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
143
144 return 0;
145}
146
147static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev)
148{
149 struct mpc52xx_gpiochip *chip;
150 struct mpc52xx_gpio_wkup __iomem *regs;
151 struct gpio_chip *gc;
152 int ret;
153
154 chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
155 if (!chip)
156 return -ENOMEM;
157
158 platform_set_drvdata(ofdev, chip);
159
160 gc = &chip->mmchip.gc;
161
162 gc->ngpio = 8;
163 gc->direction_input = mpc52xx_wkup_gpio_dir_in;
164 gc->direction_output = mpc52xx_wkup_gpio_dir_out;
165 gc->get = mpc52xx_wkup_gpio_get;
166 gc->set = mpc52xx_wkup_gpio_set;
167
168 ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip);
169 if (ret)
170 return ret;
171
172 regs = chip->mmchip.regs;
173 chip->shadow_gpioe = in_8(®s->wkup_gpioe);
174 chip->shadow_ddr = in_8(®s->wkup_ddr);
175 chip->shadow_dvo = in_8(®s->wkup_dvo);
176
177 return 0;
178}
179
180static int mpc52xx_gpiochip_remove(struct platform_device *ofdev)
181{
182 struct mpc52xx_gpiochip *chip = platform_get_drvdata(ofdev);
183
184 of_mm_gpiochip_remove(&chip->mmchip);
185
186 return 0;
187}
188
189static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
190 { .compatible = "fsl,mpc5200-gpio-wkup", },
191 {}
192};
193
194static struct platform_driver mpc52xx_wkup_gpiochip_driver = {
195 .driver = {
196 .name = "mpc5200-gpio-wkup",
197 .of_match_table = mpc52xx_wkup_gpiochip_match,
198 },
199 .probe = mpc52xx_wkup_gpiochip_probe,
200 .remove = mpc52xx_gpiochip_remove,
201};
202
203/*
204 * GPIO LIB API implementation for simple GPIOs
205 *
206 * There's a maximum of 32 simple GPIOs. Which of these are available
207 * for use depends on your board setup.
208 * The numbering reflects the bit numbering in the port registers:
209 *
210 * 0..1 > reserved
211 * 2..3 > IRDA
212 * 4..7 > ETHR
213 * 8..11 > reserved
214 * 12..15 > USB
215 * 16..17 > reserved
216 * 18..23 > PSC3
217 * 24..27 > PSC2
218 * 28..31 > PSC1
219 */
220static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
221{
222 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
223 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
224 unsigned int ret;
225
226 ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1;
227
228 return ret;
229}
230
231static inline void
232__mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
233{
234 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
235 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
236 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
237
238 if (val)
239 chip->shadow_dvo |= 1 << (31 - gpio);
240 else
241 chip->shadow_dvo &= ~(1 << (31 - gpio));
242 out_be32(®s->simple_dvo, chip->shadow_dvo);
243}
244
245static void
246mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
247{
248 unsigned long flags;
249
250 spin_lock_irqsave(&gpio_lock, flags);
251
252 __mpc52xx_simple_gpio_set(gc, gpio, val);
253
254 spin_unlock_irqrestore(&gpio_lock, flags);
255
256 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
257}
258
259static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
260{
261 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
262 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
263 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
264 unsigned long flags;
265
266 spin_lock_irqsave(&gpio_lock, flags);
267
268 /* set the direction */
269 chip->shadow_ddr &= ~(1 << (31 - gpio));
270 out_be32(®s->simple_ddr, chip->shadow_ddr);
271
272 /* and enable the pin */
273 chip->shadow_gpioe |= 1 << (31 - gpio);
274 out_be32(®s->simple_gpioe, chip->shadow_gpioe);
275
276 spin_unlock_irqrestore(&gpio_lock, flags);
277
278 return 0;
279}
280
281static int
282mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
283{
284 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
285 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
286 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
287 unsigned long flags;
288
289 spin_lock_irqsave(&gpio_lock, flags);
290
291 /* First set initial value */
292 __mpc52xx_simple_gpio_set(gc, gpio, val);
293
294 /* Then set direction */
295 chip->shadow_ddr |= 1 << (31 - gpio);
296 out_be32(®s->simple_ddr, chip->shadow_ddr);
297
298 /* Finally enable the pin */
299 chip->shadow_gpioe |= 1 << (31 - gpio);
300 out_be32(®s->simple_gpioe, chip->shadow_gpioe);
301
302 spin_unlock_irqrestore(&gpio_lock, flags);
303
304 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
305
306 return 0;
307}
308
309static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev)
310{
311 struct mpc52xx_gpiochip *chip;
312 struct gpio_chip *gc;
313 struct mpc52xx_gpio __iomem *regs;
314 int ret;
315
316 chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
317 if (!chip)
318 return -ENOMEM;
319
320 platform_set_drvdata(ofdev, chip);
321
322 gc = &chip->mmchip.gc;
323
324 gc->ngpio = 32;
325 gc->direction_input = mpc52xx_simple_gpio_dir_in;
326 gc->direction_output = mpc52xx_simple_gpio_dir_out;
327 gc->get = mpc52xx_simple_gpio_get;
328 gc->set = mpc52xx_simple_gpio_set;
329
330 ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip);
331 if (ret)
332 return ret;
333
334 regs = chip->mmchip.regs;
335 chip->shadow_gpioe = in_be32(®s->simple_gpioe);
336 chip->shadow_ddr = in_be32(®s->simple_ddr);
337 chip->shadow_dvo = in_be32(®s->simple_dvo);
338
339 return 0;
340}
341
342static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
343 { .compatible = "fsl,mpc5200-gpio", },
344 {}
345};
346
347static struct platform_driver mpc52xx_simple_gpiochip_driver = {
348 .driver = {
349 .name = "mpc5200-gpio",
350 .of_match_table = mpc52xx_simple_gpiochip_match,
351 },
352 .probe = mpc52xx_simple_gpiochip_probe,
353 .remove = mpc52xx_gpiochip_remove,
354};
355
356static struct platform_driver * const drivers[] = {
357 &mpc52xx_wkup_gpiochip_driver,
358 &mpc52xx_simple_gpiochip_driver,
359};
360
361static int __init mpc52xx_gpio_init(void)
362{
363 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
364}
365
366/* Make sure we get initialised before anyone else tries to use us */
367subsys_initcall(mpc52xx_gpio_init);
368
369static void __exit mpc52xx_gpio_exit(void)
370{
371 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
372}
373module_exit(mpc52xx_gpio_exit);
374
375MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
376MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
377MODULE_LICENSE("GPL v2");
378