Loading...
1
2/* linux/arch/arm/plat-s3c/pm-gpio.c
3 *
4 * Copyright 2008 Openmoko, Inc.
5 * Copyright 2008 Simtec Electronics
6 * Ben Dooks <ben@simtec.co.uk>
7 * http://armlinux.simtec.co.uk/
8 *
9 * S3C series GPIO PM code
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14*/
15
16#include <linux/kernel.h>
17#include <linux/device.h>
18#include <linux/init.h>
19#include <linux/io.h>
20#include <linux/gpio.h>
21
22#include <mach/gpio-samsung.h>
23
24#include <plat/gpio-core.h>
25#include <plat/pm.h>
26
27/* PM GPIO helpers */
28
29#define OFFS_CON (0x00)
30#define OFFS_DAT (0x04)
31#define OFFS_UP (0x08)
32
33static void samsung_gpio_pm_1bit_save(struct samsung_gpio_chip *chip)
34{
35 chip->pm_save[0] = __raw_readl(chip->base + OFFS_CON);
36 chip->pm_save[1] = __raw_readl(chip->base + OFFS_DAT);
37}
38
39static void samsung_gpio_pm_1bit_resume(struct samsung_gpio_chip *chip)
40{
41 void __iomem *base = chip->base;
42 u32 old_gpcon = __raw_readl(base + OFFS_CON);
43 u32 old_gpdat = __raw_readl(base + OFFS_DAT);
44 u32 gps_gpcon = chip->pm_save[0];
45 u32 gps_gpdat = chip->pm_save[1];
46 u32 gpcon;
47
48 /* GPACON only has one bit per control / data and no PULLUPs.
49 * GPACON[x] = 0 => Output, 1 => SFN */
50
51 /* first set all SFN bits to SFN */
52
53 gpcon = old_gpcon | gps_gpcon;
54 __raw_writel(gpcon, base + OFFS_CON);
55
56 /* now set all the other bits */
57
58 __raw_writel(gps_gpdat, base + OFFS_DAT);
59 __raw_writel(gps_gpcon, base + OFFS_CON);
60
61 S3C_PMDBG("%s: CON %08x => %08x, DAT %08x => %08x\n",
62 chip->chip.label, old_gpcon, gps_gpcon, old_gpdat, gps_gpdat);
63}
64
65struct samsung_gpio_pm samsung_gpio_pm_1bit = {
66 .save = samsung_gpio_pm_1bit_save,
67 .resume = samsung_gpio_pm_1bit_resume,
68};
69
70static void samsung_gpio_pm_2bit_save(struct samsung_gpio_chip *chip)
71{
72 chip->pm_save[0] = __raw_readl(chip->base + OFFS_CON);
73 chip->pm_save[1] = __raw_readl(chip->base + OFFS_DAT);
74 chip->pm_save[2] = __raw_readl(chip->base + OFFS_UP);
75}
76
77/* Test whether the given masked+shifted bits of an GPIO configuration
78 * are one of the SFN (special function) modes. */
79
80static inline int is_sfn(unsigned long con)
81{
82 return con >= 2;
83}
84
85/* Test if the given masked+shifted GPIO configuration is an input */
86
87static inline int is_in(unsigned long con)
88{
89 return con == 0;
90}
91
92/* Test if the given masked+shifted GPIO configuration is an output */
93
94static inline int is_out(unsigned long con)
95{
96 return con == 1;
97}
98
99/**
100 * samsung_gpio_pm_2bit_resume() - restore the given GPIO bank
101 * @chip: The chip information to resume.
102 *
103 * Restore one of the GPIO banks that was saved during suspend. This is
104 * not as simple as once thought, due to the possibility of glitches
105 * from the order that the CON and DAT registers are set in.
106 *
107 * The three states the pin can be are {IN,OUT,SFN} which gives us 9
108 * combinations of changes to check. Three of these, if the pin stays
109 * in the same configuration can be discounted. This leaves us with
110 * the following:
111 *
112 * { IN => OUT } Change DAT first
113 * { IN => SFN } Change CON first
114 * { OUT => SFN } Change CON first, so new data will not glitch
115 * { OUT => IN } Change CON first, so new data will not glitch
116 * { SFN => IN } Change CON first
117 * { SFN => OUT } Change DAT first, so new data will not glitch [1]
118 *
119 * We do not currently deal with the UP registers as these control
120 * weak resistors, so a small delay in change should not need to bring
121 * these into the calculations.
122 *
123 * [1] this assumes that writing to a pin DAT whilst in SFN will set the
124 * state for when it is next output.
125 */
126static void samsung_gpio_pm_2bit_resume(struct samsung_gpio_chip *chip)
127{
128 void __iomem *base = chip->base;
129 u32 old_gpcon = __raw_readl(base + OFFS_CON);
130 u32 old_gpdat = __raw_readl(base + OFFS_DAT);
131 u32 gps_gpcon = chip->pm_save[0];
132 u32 gps_gpdat = chip->pm_save[1];
133 u32 gpcon, old, new, mask;
134 u32 change_mask = 0x0;
135 int nr;
136
137 /* restore GPIO pull-up settings */
138 __raw_writel(chip->pm_save[2], base + OFFS_UP);
139
140 /* Create a change_mask of all the items that need to have
141 * their CON value changed before their DAT value, so that
142 * we minimise the work between the two settings.
143 */
144
145 for (nr = 0, mask = 0x03; nr < 32; nr += 2, mask <<= 2) {
146 old = (old_gpcon & mask) >> nr;
147 new = (gps_gpcon & mask) >> nr;
148
149 /* If there is no change, then skip */
150
151 if (old == new)
152 continue;
153
154 /* If both are special function, then skip */
155
156 if (is_sfn(old) && is_sfn(new))
157 continue;
158
159 /* Change is IN => OUT, do not change now */
160
161 if (is_in(old) && is_out(new))
162 continue;
163
164 /* Change is SFN => OUT, do not change now */
165
166 if (is_sfn(old) && is_out(new))
167 continue;
168
169 /* We should now be at the case of IN=>SFN,
170 * OUT=>SFN, OUT=>IN, SFN=>IN. */
171
172 change_mask |= mask;
173 }
174
175
176 /* Write the new CON settings */
177
178 gpcon = old_gpcon & ~change_mask;
179 gpcon |= gps_gpcon & change_mask;
180
181 __raw_writel(gpcon, base + OFFS_CON);
182
183 /* Now change any items that require DAT,CON */
184
185 __raw_writel(gps_gpdat, base + OFFS_DAT);
186 __raw_writel(gps_gpcon, base + OFFS_CON);
187
188 S3C_PMDBG("%s: CON %08x => %08x, DAT %08x => %08x\n",
189 chip->chip.label, old_gpcon, gps_gpcon, old_gpdat, gps_gpdat);
190}
191
192struct samsung_gpio_pm samsung_gpio_pm_2bit = {
193 .save = samsung_gpio_pm_2bit_save,
194 .resume = samsung_gpio_pm_2bit_resume,
195};
196
197#if defined(CONFIG_ARCH_S3C64XX)
198static void samsung_gpio_pm_4bit_save(struct samsung_gpio_chip *chip)
199{
200 chip->pm_save[1] = __raw_readl(chip->base + OFFS_CON);
201 chip->pm_save[2] = __raw_readl(chip->base + OFFS_DAT);
202 chip->pm_save[3] = __raw_readl(chip->base + OFFS_UP);
203
204 if (chip->chip.ngpio > 8)
205 chip->pm_save[0] = __raw_readl(chip->base - 4);
206}
207
208static u32 samsung_gpio_pm_4bit_mask(u32 old_gpcon, u32 gps_gpcon)
209{
210 u32 old, new, mask;
211 u32 change_mask = 0x0;
212 int nr;
213
214 for (nr = 0, mask = 0x0f; nr < 16; nr += 4, mask <<= 4) {
215 old = (old_gpcon & mask) >> nr;
216 new = (gps_gpcon & mask) >> nr;
217
218 /* If there is no change, then skip */
219
220 if (old == new)
221 continue;
222
223 /* If both are special function, then skip */
224
225 if (is_sfn(old) && is_sfn(new))
226 continue;
227
228 /* Change is IN => OUT, do not change now */
229
230 if (is_in(old) && is_out(new))
231 continue;
232
233 /* Change is SFN => OUT, do not change now */
234
235 if (is_sfn(old) && is_out(new))
236 continue;
237
238 /* We should now be at the case of IN=>SFN,
239 * OUT=>SFN, OUT=>IN, SFN=>IN. */
240
241 change_mask |= mask;
242 }
243
244 return change_mask;
245}
246
247static void samsung_gpio_pm_4bit_con(struct samsung_gpio_chip *chip, int index)
248{
249 void __iomem *con = chip->base + (index * 4);
250 u32 old_gpcon = __raw_readl(con);
251 u32 gps_gpcon = chip->pm_save[index + 1];
252 u32 gpcon, mask;
253
254 mask = samsung_gpio_pm_4bit_mask(old_gpcon, gps_gpcon);
255
256 gpcon = old_gpcon & ~mask;
257 gpcon |= gps_gpcon & mask;
258
259 __raw_writel(gpcon, con);
260}
261
262static void samsung_gpio_pm_4bit_resume(struct samsung_gpio_chip *chip)
263{
264 void __iomem *base = chip->base;
265 u32 old_gpcon[2];
266 u32 old_gpdat = __raw_readl(base + OFFS_DAT);
267 u32 gps_gpdat = chip->pm_save[2];
268
269 /* First, modify the CON settings */
270
271 old_gpcon[0] = 0;
272 old_gpcon[1] = __raw_readl(base + OFFS_CON);
273
274 samsung_gpio_pm_4bit_con(chip, 0);
275 if (chip->chip.ngpio > 8) {
276 old_gpcon[0] = __raw_readl(base - 4);
277 samsung_gpio_pm_4bit_con(chip, -1);
278 }
279
280 /* Now change the configurations that require DAT,CON */
281
282 __raw_writel(chip->pm_save[2], base + OFFS_DAT);
283 __raw_writel(chip->pm_save[1], base + OFFS_CON);
284 if (chip->chip.ngpio > 8)
285 __raw_writel(chip->pm_save[0], base - 4);
286
287 __raw_writel(chip->pm_save[2], base + OFFS_DAT);
288 __raw_writel(chip->pm_save[3], base + OFFS_UP);
289
290 if (chip->chip.ngpio > 8) {
291 S3C_PMDBG("%s: CON4 %08x,%08x => %08x,%08x, DAT %08x => %08x\n",
292 chip->chip.label, old_gpcon[0], old_gpcon[1],
293 __raw_readl(base - 4),
294 __raw_readl(base + OFFS_CON),
295 old_gpdat, gps_gpdat);
296 } else
297 S3C_PMDBG("%s: CON4 %08x => %08x, DAT %08x => %08x\n",
298 chip->chip.label, old_gpcon[1],
299 __raw_readl(base + OFFS_CON),
300 old_gpdat, gps_gpdat);
301}
302
303struct samsung_gpio_pm samsung_gpio_pm_4bit = {
304 .save = samsung_gpio_pm_4bit_save,
305 .resume = samsung_gpio_pm_4bit_resume,
306};
307#endif /* CONFIG_ARCH_S3C64XX */
308
309/**
310 * samsung_pm_save_gpio() - save gpio chip data for suspend
311 * @ourchip: The chip for suspend.
312 */
313static void samsung_pm_save_gpio(struct samsung_gpio_chip *ourchip)
314{
315 struct samsung_gpio_pm *pm = ourchip->pm;
316
317 if (pm == NULL || pm->save == NULL)
318 S3C_PMDBG("%s: no pm for %s\n", __func__, ourchip->chip.label);
319 else
320 pm->save(ourchip);
321}
322
323/**
324 * samsung_pm_save_gpios() - Save the state of the GPIO banks.
325 *
326 * For all the GPIO banks, save the state of each one ready for going
327 * into a suspend mode.
328 */
329void samsung_pm_save_gpios(void)
330{
331 struct samsung_gpio_chip *ourchip;
332 unsigned int gpio_nr;
333
334 for (gpio_nr = 0; gpio_nr < S3C_GPIO_END;) {
335 ourchip = samsung_gpiolib_getchip(gpio_nr);
336 if (!ourchip) {
337 gpio_nr++;
338 continue;
339 }
340
341 samsung_pm_save_gpio(ourchip);
342
343 S3C_PMDBG("%s: save %08x,%08x,%08x,%08x\n",
344 ourchip->chip.label,
345 ourchip->pm_save[0],
346 ourchip->pm_save[1],
347 ourchip->pm_save[2],
348 ourchip->pm_save[3]);
349
350 gpio_nr += ourchip->chip.ngpio;
351 gpio_nr += CONFIG_S3C_GPIO_SPACE;
352 }
353}
354
355/**
356 * samsung_pm_resume_gpio() - restore gpio chip data after suspend
357 * @ourchip: The suspended chip.
358 */
359static void samsung_pm_resume_gpio(struct samsung_gpio_chip *ourchip)
360{
361 struct samsung_gpio_pm *pm = ourchip->pm;
362
363 if (pm == NULL || pm->resume == NULL)
364 S3C_PMDBG("%s: no pm for %s\n", __func__, ourchip->chip.label);
365 else
366 pm->resume(ourchip);
367}
368
369void samsung_pm_restore_gpios(void)
370{
371 struct samsung_gpio_chip *ourchip;
372 unsigned int gpio_nr;
373
374 for (gpio_nr = 0; gpio_nr < S3C_GPIO_END;) {
375 ourchip = samsung_gpiolib_getchip(gpio_nr);
376 if (!ourchip) {
377 gpio_nr++;
378 continue;
379 }
380
381 samsung_pm_resume_gpio(ourchip);
382
383 gpio_nr += ourchip->chip.ngpio;
384 gpio_nr += CONFIG_S3C_GPIO_SPACE;
385 }
386}
1// SPDX-License-Identifier: GPL-2.0+
2//
3// Copyright 2008 Openmoko, Inc.
4// Copyright 2008 Simtec Electronics
5// Ben Dooks <ben@simtec.co.uk>
6// http://armlinux.simtec.co.uk/
7//
8// S3C series GPIO PM code
9
10#include <linux/kernel.h>
11#include <linux/device.h>
12#include <linux/init.h>
13#include <linux/io.h>
14#include <linux/gpio.h>
15
16#include <mach/gpio-samsung.h>
17
18#include <plat/gpio-core.h>
19#include <plat/pm.h>
20
21/* PM GPIO helpers */
22
23#define OFFS_CON (0x00)
24#define OFFS_DAT (0x04)
25#define OFFS_UP (0x08)
26
27static void samsung_gpio_pm_1bit_save(struct samsung_gpio_chip *chip)
28{
29 chip->pm_save[0] = __raw_readl(chip->base + OFFS_CON);
30 chip->pm_save[1] = __raw_readl(chip->base + OFFS_DAT);
31}
32
33static void samsung_gpio_pm_1bit_resume(struct samsung_gpio_chip *chip)
34{
35 void __iomem *base = chip->base;
36 u32 old_gpcon = __raw_readl(base + OFFS_CON);
37 u32 old_gpdat = __raw_readl(base + OFFS_DAT);
38 u32 gps_gpcon = chip->pm_save[0];
39 u32 gps_gpdat = chip->pm_save[1];
40 u32 gpcon;
41
42 /* GPACON only has one bit per control / data and no PULLUPs.
43 * GPACON[x] = 0 => Output, 1 => SFN */
44
45 /* first set all SFN bits to SFN */
46
47 gpcon = old_gpcon | gps_gpcon;
48 __raw_writel(gpcon, base + OFFS_CON);
49
50 /* now set all the other bits */
51
52 __raw_writel(gps_gpdat, base + OFFS_DAT);
53 __raw_writel(gps_gpcon, base + OFFS_CON);
54
55 S3C_PMDBG("%s: CON %08x => %08x, DAT %08x => %08x\n",
56 chip->chip.label, old_gpcon, gps_gpcon, old_gpdat, gps_gpdat);
57}
58
59struct samsung_gpio_pm samsung_gpio_pm_1bit = {
60 .save = samsung_gpio_pm_1bit_save,
61 .resume = samsung_gpio_pm_1bit_resume,
62};
63
64static void samsung_gpio_pm_2bit_save(struct samsung_gpio_chip *chip)
65{
66 chip->pm_save[0] = __raw_readl(chip->base + OFFS_CON);
67 chip->pm_save[1] = __raw_readl(chip->base + OFFS_DAT);
68 chip->pm_save[2] = __raw_readl(chip->base + OFFS_UP);
69}
70
71/* Test whether the given masked+shifted bits of an GPIO configuration
72 * are one of the SFN (special function) modes. */
73
74static inline int is_sfn(unsigned long con)
75{
76 return con >= 2;
77}
78
79/* Test if the given masked+shifted GPIO configuration is an input */
80
81static inline int is_in(unsigned long con)
82{
83 return con == 0;
84}
85
86/* Test if the given masked+shifted GPIO configuration is an output */
87
88static inline int is_out(unsigned long con)
89{
90 return con == 1;
91}
92
93/**
94 * samsung_gpio_pm_2bit_resume() - restore the given GPIO bank
95 * @chip: The chip information to resume.
96 *
97 * Restore one of the GPIO banks that was saved during suspend. This is
98 * not as simple as once thought, due to the possibility of glitches
99 * from the order that the CON and DAT registers are set in.
100 *
101 * The three states the pin can be are {IN,OUT,SFN} which gives us 9
102 * combinations of changes to check. Three of these, if the pin stays
103 * in the same configuration can be discounted. This leaves us with
104 * the following:
105 *
106 * { IN => OUT } Change DAT first
107 * { IN => SFN } Change CON first
108 * { OUT => SFN } Change CON first, so new data will not glitch
109 * { OUT => IN } Change CON first, so new data will not glitch
110 * { SFN => IN } Change CON first
111 * { SFN => OUT } Change DAT first, so new data will not glitch [1]
112 *
113 * We do not currently deal with the UP registers as these control
114 * weak resistors, so a small delay in change should not need to bring
115 * these into the calculations.
116 *
117 * [1] this assumes that writing to a pin DAT whilst in SFN will set the
118 * state for when it is next output.
119 */
120static void samsung_gpio_pm_2bit_resume(struct samsung_gpio_chip *chip)
121{
122 void __iomem *base = chip->base;
123 u32 old_gpcon = __raw_readl(base + OFFS_CON);
124 u32 old_gpdat = __raw_readl(base + OFFS_DAT);
125 u32 gps_gpcon = chip->pm_save[0];
126 u32 gps_gpdat = chip->pm_save[1];
127 u32 gpcon, old, new, mask;
128 u32 change_mask = 0x0;
129 int nr;
130
131 /* restore GPIO pull-up settings */
132 __raw_writel(chip->pm_save[2], base + OFFS_UP);
133
134 /* Create a change_mask of all the items that need to have
135 * their CON value changed before their DAT value, so that
136 * we minimise the work between the two settings.
137 */
138
139 for (nr = 0, mask = 0x03; nr < 32; nr += 2, mask <<= 2) {
140 old = (old_gpcon & mask) >> nr;
141 new = (gps_gpcon & mask) >> nr;
142
143 /* If there is no change, then skip */
144
145 if (old == new)
146 continue;
147
148 /* If both are special function, then skip */
149
150 if (is_sfn(old) && is_sfn(new))
151 continue;
152
153 /* Change is IN => OUT, do not change now */
154
155 if (is_in(old) && is_out(new))
156 continue;
157
158 /* Change is SFN => OUT, do not change now */
159
160 if (is_sfn(old) && is_out(new))
161 continue;
162
163 /* We should now be at the case of IN=>SFN,
164 * OUT=>SFN, OUT=>IN, SFN=>IN. */
165
166 change_mask |= mask;
167 }
168
169
170 /* Write the new CON settings */
171
172 gpcon = old_gpcon & ~change_mask;
173 gpcon |= gps_gpcon & change_mask;
174
175 __raw_writel(gpcon, base + OFFS_CON);
176
177 /* Now change any items that require DAT,CON */
178
179 __raw_writel(gps_gpdat, base + OFFS_DAT);
180 __raw_writel(gps_gpcon, base + OFFS_CON);
181
182 S3C_PMDBG("%s: CON %08x => %08x, DAT %08x => %08x\n",
183 chip->chip.label, old_gpcon, gps_gpcon, old_gpdat, gps_gpdat);
184}
185
186struct samsung_gpio_pm samsung_gpio_pm_2bit = {
187 .save = samsung_gpio_pm_2bit_save,
188 .resume = samsung_gpio_pm_2bit_resume,
189};
190
191#if defined(CONFIG_ARCH_S3C64XX)
192static void samsung_gpio_pm_4bit_save(struct samsung_gpio_chip *chip)
193{
194 chip->pm_save[1] = __raw_readl(chip->base + OFFS_CON);
195 chip->pm_save[2] = __raw_readl(chip->base + OFFS_DAT);
196 chip->pm_save[3] = __raw_readl(chip->base + OFFS_UP);
197
198 if (chip->chip.ngpio > 8)
199 chip->pm_save[0] = __raw_readl(chip->base - 4);
200}
201
202static u32 samsung_gpio_pm_4bit_mask(u32 old_gpcon, u32 gps_gpcon)
203{
204 u32 old, new, mask;
205 u32 change_mask = 0x0;
206 int nr;
207
208 for (nr = 0, mask = 0x0f; nr < 16; nr += 4, mask <<= 4) {
209 old = (old_gpcon & mask) >> nr;
210 new = (gps_gpcon & mask) >> nr;
211
212 /* If there is no change, then skip */
213
214 if (old == new)
215 continue;
216
217 /* If both are special function, then skip */
218
219 if (is_sfn(old) && is_sfn(new))
220 continue;
221
222 /* Change is IN => OUT, do not change now */
223
224 if (is_in(old) && is_out(new))
225 continue;
226
227 /* Change is SFN => OUT, do not change now */
228
229 if (is_sfn(old) && is_out(new))
230 continue;
231
232 /* We should now be at the case of IN=>SFN,
233 * OUT=>SFN, OUT=>IN, SFN=>IN. */
234
235 change_mask |= mask;
236 }
237
238 return change_mask;
239}
240
241static void samsung_gpio_pm_4bit_con(struct samsung_gpio_chip *chip, int index)
242{
243 void __iomem *con = chip->base + (index * 4);
244 u32 old_gpcon = __raw_readl(con);
245 u32 gps_gpcon = chip->pm_save[index + 1];
246 u32 gpcon, mask;
247
248 mask = samsung_gpio_pm_4bit_mask(old_gpcon, gps_gpcon);
249
250 gpcon = old_gpcon & ~mask;
251 gpcon |= gps_gpcon & mask;
252
253 __raw_writel(gpcon, con);
254}
255
256static void samsung_gpio_pm_4bit_resume(struct samsung_gpio_chip *chip)
257{
258 void __iomem *base = chip->base;
259 u32 old_gpcon[2];
260 u32 old_gpdat = __raw_readl(base + OFFS_DAT);
261 u32 gps_gpdat = chip->pm_save[2];
262
263 /* First, modify the CON settings */
264
265 old_gpcon[0] = 0;
266 old_gpcon[1] = __raw_readl(base + OFFS_CON);
267
268 samsung_gpio_pm_4bit_con(chip, 0);
269 if (chip->chip.ngpio > 8) {
270 old_gpcon[0] = __raw_readl(base - 4);
271 samsung_gpio_pm_4bit_con(chip, -1);
272 }
273
274 /* Now change the configurations that require DAT,CON */
275
276 __raw_writel(chip->pm_save[2], base + OFFS_DAT);
277 __raw_writel(chip->pm_save[1], base + OFFS_CON);
278 if (chip->chip.ngpio > 8)
279 __raw_writel(chip->pm_save[0], base - 4);
280
281 __raw_writel(chip->pm_save[2], base + OFFS_DAT);
282 __raw_writel(chip->pm_save[3], base + OFFS_UP);
283
284 if (chip->chip.ngpio > 8) {
285 S3C_PMDBG("%s: CON4 %08x,%08x => %08x,%08x, DAT %08x => %08x\n",
286 chip->chip.label, old_gpcon[0], old_gpcon[1],
287 __raw_readl(base - 4),
288 __raw_readl(base + OFFS_CON),
289 old_gpdat, gps_gpdat);
290 } else
291 S3C_PMDBG("%s: CON4 %08x => %08x, DAT %08x => %08x\n",
292 chip->chip.label, old_gpcon[1],
293 __raw_readl(base + OFFS_CON),
294 old_gpdat, gps_gpdat);
295}
296
297struct samsung_gpio_pm samsung_gpio_pm_4bit = {
298 .save = samsung_gpio_pm_4bit_save,
299 .resume = samsung_gpio_pm_4bit_resume,
300};
301#endif /* CONFIG_ARCH_S3C64XX */
302
303/**
304 * samsung_pm_save_gpio() - save gpio chip data for suspend
305 * @ourchip: The chip for suspend.
306 */
307static void samsung_pm_save_gpio(struct samsung_gpio_chip *ourchip)
308{
309 struct samsung_gpio_pm *pm = ourchip->pm;
310
311 if (pm == NULL || pm->save == NULL)
312 S3C_PMDBG("%s: no pm for %s\n", __func__, ourchip->chip.label);
313 else
314 pm->save(ourchip);
315}
316
317/**
318 * samsung_pm_save_gpios() - Save the state of the GPIO banks.
319 *
320 * For all the GPIO banks, save the state of each one ready for going
321 * into a suspend mode.
322 */
323void samsung_pm_save_gpios(void)
324{
325 struct samsung_gpio_chip *ourchip;
326 unsigned int gpio_nr;
327
328 for (gpio_nr = 0; gpio_nr < S3C_GPIO_END;) {
329 ourchip = samsung_gpiolib_getchip(gpio_nr);
330 if (!ourchip) {
331 gpio_nr++;
332 continue;
333 }
334
335 samsung_pm_save_gpio(ourchip);
336
337 S3C_PMDBG("%s: save %08x,%08x,%08x,%08x\n",
338 ourchip->chip.label,
339 ourchip->pm_save[0],
340 ourchip->pm_save[1],
341 ourchip->pm_save[2],
342 ourchip->pm_save[3]);
343
344 gpio_nr += ourchip->chip.ngpio;
345 gpio_nr += CONFIG_S3C_GPIO_SPACE;
346 }
347}
348
349/**
350 * samsung_pm_resume_gpio() - restore gpio chip data after suspend
351 * @ourchip: The suspended chip.
352 */
353static void samsung_pm_resume_gpio(struct samsung_gpio_chip *ourchip)
354{
355 struct samsung_gpio_pm *pm = ourchip->pm;
356
357 if (pm == NULL || pm->resume == NULL)
358 S3C_PMDBG("%s: no pm for %s\n", __func__, ourchip->chip.label);
359 else
360 pm->resume(ourchip);
361}
362
363void samsung_pm_restore_gpios(void)
364{
365 struct samsung_gpio_chip *ourchip;
366 unsigned int gpio_nr;
367
368 for (gpio_nr = 0; gpio_nr < S3C_GPIO_END;) {
369 ourchip = samsung_gpiolib_getchip(gpio_nr);
370 if (!ourchip) {
371 gpio_nr++;
372 continue;
373 }
374
375 samsung_pm_resume_gpio(ourchip);
376
377 gpio_nr += ourchip->chip.ngpio;
378 gpio_nr += CONFIG_S3C_GPIO_SPACE;
379 }
380}