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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
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
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44
45
46
47 gpcon = old_gpcon | gps_gpcon;
48 __raw_writel(gpcon, base + OFFS_CON);
49
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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
72
73
74static inline int is_sfn(unsigned long con)
75{
76 return con >= 2;
77}
78
79
80
81static inline int is_in(unsigned long con)
82{
83 return con == 0;
84}
85
86
87
88static inline int is_out(unsigned long con)
89{
90 return con == 1;
91}
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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
132 __raw_writel(chip->pm_save[2], base + OFFS_UP);
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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
144
145 if (old == new)
146 continue;
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150 if (is_sfn(old) && is_sfn(new))
151 continue;
152
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154
155 if (is_in(old) && is_out(new))
156 continue;
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160 if (is_sfn(old) && is_out(new))
161 continue;
162
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166 change_mask |= mask;
167 }
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172 gpcon = old_gpcon & ~change_mask;
173 gpcon |= gps_gpcon & change_mask;
174
175 __raw_writel(gpcon, base + OFFS_CON);
176
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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
213
214 if (old == new)
215 continue;
216
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219 if (is_sfn(old) && is_sfn(new))
220 continue;
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224 if (is_in(old) && is_out(new))
225 continue;
226
227
228
229 if (is_sfn(old) && is_out(new))
230 continue;
231
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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
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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
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
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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}
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321
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}
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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}
381