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Linux/arch/arm/mach-pxa/mfp-pxa2xx.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  *  linux/arch/arm/mach-pxa/mfp-pxa2xx.c
  4  *
  5  *  PXA2xx pin mux configuration support
  6  *
  7  *  The GPIOs on PXA2xx can be configured as one of many alternate
  8  *  functions, this is by concept samilar to the MFP configuration
  9  *  on PXA3xx,  what's more important, the low power pin state and
 10  *  wakeup detection are also supported by the same framework.
 11  */
 12 #include <linux/gpio.h>
 13 #include <linux/gpio-pxa.h>
 14 #include <linux/module.h>
 15 #include <linux/kernel.h>
 16 #include <linux/init.h>
 17 #include <linux/io.h>
 18 #include <linux/syscore_ops.h>
 19 #include <linux/soc/pxa/cpu.h>
 20 
 21 #include "pxa2xx-regs.h"
 22 #include "mfp-pxa2xx.h"
 23 #include "mfp-pxa27x.h"
 24 
 25 #include "generic.h"
 26 
 27 #define PGSR(x)         __REG2(0x40F00020, (x) << 2)
 28 #define __GAFR(u, x)    __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3)
 29 #define GAFR_L(x)       __GAFR(0, x)
 30 #define GAFR_U(x)       __GAFR(1, x)
 31 
 32 #define BANK_OFF(n)     (((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2))
 33 #define GPLR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5))
 34 #define GPDR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x0c)
 35 #define GPSR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x18)
 36 #define GPCR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x24)
 37 
 38 #define PWER_WE35       (1 << 24)
 39 
 40 struct gpio_desc {
 41         unsigned        valid           : 1;
 42         unsigned        can_wakeup      : 1;
 43         unsigned        keypad_gpio     : 1;
 44         unsigned        dir_inverted    : 1;
 45         unsigned int    mask; /* bit mask in PWER or PKWR */
 46         unsigned int    mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
 47         unsigned long   config;
 48 };
 49 
 50 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
 51 
 52 static unsigned long gpdr_lpm[4];
 53 
 54 static int __mfp_config_gpio(unsigned gpio, unsigned long c)
 55 {
 56         unsigned long gafr, mask = GPIO_bit(gpio);
 57         int bank = gpio_to_bank(gpio);
 58         int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
 59         int shft = (gpio & 0xf) << 1;
 60         int fn = MFP_AF(c);
 61         int is_out = (c & MFP_DIR_OUT) ? 1 : 0;
 62 
 63         if (fn > 3)
 64                 return -EINVAL;
 65 
 66         /* alternate function and direction at run-time */
 67         gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
 68         gafr = (gafr & ~(0x3 << shft)) | (fn << shft);
 69 
 70         if (uorl == 0)
 71                 GAFR_L(bank) = gafr;
 72         else
 73                 GAFR_U(bank) = gafr;
 74 
 75         if (is_out ^ gpio_desc[gpio].dir_inverted)
 76                 GPDR(gpio) |= mask;
 77         else
 78                 GPDR(gpio) &= ~mask;
 79 
 80         /* alternate function and direction at low power mode */
 81         switch (c & MFP_LPM_STATE_MASK) {
 82         case MFP_LPM_DRIVE_HIGH:
 83                 PGSR(bank) |= mask;
 84                 is_out = 1;
 85                 break;
 86         case MFP_LPM_DRIVE_LOW:
 87                 PGSR(bank) &= ~mask;
 88                 is_out = 1;
 89                 break;
 90         case MFP_LPM_INPUT:
 91         case MFP_LPM_DEFAULT:
 92                 break;
 93         default:
 94                 /* warning and fall through, treat as MFP_LPM_DEFAULT */
 95                 pr_warn("%s: GPIO%d: unsupported low power mode\n",
 96                         __func__, gpio);
 97                 break;
 98         }
 99 
100         if (is_out ^ gpio_desc[gpio].dir_inverted)
101                 gpdr_lpm[bank] |= mask;
102         else
103                 gpdr_lpm[bank] &= ~mask;
104 
105         /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
106          * configurations of those pins not able to wakeup
107          */
108         if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
109                 pr_warn("%s: GPIO%d unable to wakeup\n", __func__, gpio);
110                 return -EINVAL;
111         }
112 
113         if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
114                 pr_warn("%s: output GPIO%d unable to wakeup\n", __func__, gpio);
115                 return -EINVAL;
116         }
117 
118         return 0;
119 }
120 
121 static inline int __mfp_validate(int mfp)
122 {
123         int gpio = mfp_to_gpio(mfp);
124 
125         if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
126                 pr_warn("%s: GPIO%d is invalid pin\n", __func__, gpio);
127                 return -1;
128         }
129 
130         return gpio;
131 }
132 
133 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
134 {
135         unsigned long flags;
136         unsigned long *c;
137         int i, gpio;
138 
139         for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
140 
141                 gpio = __mfp_validate(MFP_PIN(*c));
142                 if (gpio < 0)
143                         continue;
144 
145                 local_irq_save(flags);
146 
147                 gpio_desc[gpio].config = *c;
148                 __mfp_config_gpio(gpio, *c);
149 
150                 local_irq_restore(flags);
151         }
152 }
153 
154 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
155 {
156         unsigned long flags, c;
157         int gpio;
158 
159         gpio = __mfp_validate(mfp);
160         if (gpio < 0)
161                 return;
162 
163         local_irq_save(flags);
164 
165         c = gpio_desc[gpio].config;
166         c = (c & ~MFP_LPM_STATE_MASK) | lpm;
167         __mfp_config_gpio(gpio, c);
168 
169         local_irq_restore(flags);
170 }
171 
172 int gpio_set_wake(unsigned int gpio, unsigned int on)
173 {
174         struct gpio_desc *d;
175         unsigned long c, mux_taken;
176 
177         if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
178                 return -EINVAL;
179 
180         d = &gpio_desc[gpio];
181         c = d->config;
182 
183         if (!d->valid)
184                 return -EINVAL;
185 
186         /* Allow keypad GPIOs to wakeup system when
187          * configured as generic GPIOs.
188          */
189         if (d->keypad_gpio && (MFP_AF(d->config) == 0) &&
190             (d->config & MFP_LPM_CAN_WAKEUP)) {
191                 if (on)
192                         PKWR |= d->mask;
193                 else
194                         PKWR &= ~d->mask;
195                 return 0;
196         }
197 
198         mux_taken = (PWER & d->mux_mask) & (~d->mask);
199         if (on && mux_taken)
200                 return -EBUSY;
201 
202         if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
203                 if (on) {
204                         PWER = (PWER & ~d->mux_mask) | d->mask;
205 
206                         if (c & MFP_LPM_EDGE_RISE)
207                                 PRER |= d->mask;
208                         else
209                                 PRER &= ~d->mask;
210 
211                         if (c & MFP_LPM_EDGE_FALL)
212                                 PFER |= d->mask;
213                         else
214                                 PFER &= ~d->mask;
215                 } else {
216                         PWER &= ~d->mask;
217                         PRER &= ~d->mask;
218                         PFER &= ~d->mask;
219                 }
220         }
221         return 0;
222 }
223 
224 #ifdef CONFIG_PXA25x
225 static void __init pxa25x_mfp_init(void)
226 {
227         int i;
228 
229         /* running before pxa_gpio_probe() */
230         pxa_last_gpio = 84;
231         for (i = 0; i <= pxa_last_gpio; i++)
232                 gpio_desc[i].valid = 1;
233 
234         for (i = 0; i <= 15; i++) {
235                 gpio_desc[i].can_wakeup = 1;
236                 gpio_desc[i].mask = GPIO_bit(i);
237         }
238 
239         /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
240          * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
241          */
242         for (i = 86; i <= pxa_last_gpio; i++)
243                 gpio_desc[i].dir_inverted = 1;
244 }
245 #else
246 static inline void pxa25x_mfp_init(void) {}
247 #endif /* CONFIG_PXA25x */
248 
249 #ifdef CONFIG_PXA27x
250 static int pxa27x_pkwr_gpio[] = {
251         13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
252         95, 96, 97, 98, 99, 100, 101, 102
253 };
254 
255 int keypad_set_wake(unsigned int on)
256 {
257         unsigned int i, gpio, mask = 0;
258         struct gpio_desc *d;
259 
260         for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
261 
262                 gpio = pxa27x_pkwr_gpio[i];
263                 d = &gpio_desc[gpio];
264 
265                 /* skip if configured as generic GPIO */
266                 if (MFP_AF(d->config) == 0)
267                         continue;
268 
269                 if (d->config & MFP_LPM_CAN_WAKEUP)
270                         mask |= gpio_desc[gpio].mask;
271         }
272 
273         if (on)
274                 PKWR |= mask;
275         else
276                 PKWR &= ~mask;
277         return 0;
278 }
279 
280 #define PWER_WEMUX2_GPIO38      (1 << 16)
281 #define PWER_WEMUX2_GPIO53      (2 << 16)
282 #define PWER_WEMUX2_GPIO40      (3 << 16)
283 #define PWER_WEMUX2_GPIO36      (4 << 16)
284 #define PWER_WEMUX2_MASK        (7 << 16)
285 #define PWER_WEMUX3_GPIO31      (1 << 19)
286 #define PWER_WEMUX3_GPIO113     (2 << 19)
287 #define PWER_WEMUX3_MASK        (3 << 19)
288 
289 #define INIT_GPIO_DESC_MUXED(mux, gpio)                         \
290 do {                                                            \
291         gpio_desc[(gpio)].can_wakeup = 1;                       \
292         gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio;  \
293         gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK;     \
294 } while (0)
295 
296 static void __init pxa27x_mfp_init(void)
297 {
298         int i, gpio;
299 
300         pxa_last_gpio = 120;    /* running before pxa_gpio_probe() */
301         for (i = 0; i <= pxa_last_gpio; i++) {
302                 /* skip GPIO2, 5, 6, 7, 8, they are not
303                  * valid pins allow configuration
304                  */
305                 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
306                         continue;
307 
308                 gpio_desc[i].valid = 1;
309         }
310 
311         /* Keypad GPIOs */
312         for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
313                 gpio = pxa27x_pkwr_gpio[i];
314                 gpio_desc[gpio].can_wakeup = 1;
315                 gpio_desc[gpio].keypad_gpio = 1;
316                 gpio_desc[gpio].mask = 1 << i;
317         }
318 
319         /* Overwrite GPIO13 as a PWER wakeup source */
320         for (i = 0; i <= 15; i++) {
321                 /* skip GPIO2, 5, 6, 7, 8 */
322                 if (GPIO_bit(i) & 0x1e4)
323                         continue;
324 
325                 gpio_desc[i].can_wakeup = 1;
326                 gpio_desc[i].mask = GPIO_bit(i);
327         }
328 
329         gpio_desc[35].can_wakeup = 1;
330         gpio_desc[35].mask = PWER_WE35;
331 
332         INIT_GPIO_DESC_MUXED(WEMUX3, 31);
333         INIT_GPIO_DESC_MUXED(WEMUX3, 113);
334         INIT_GPIO_DESC_MUXED(WEMUX2, 38);
335         INIT_GPIO_DESC_MUXED(WEMUX2, 53);
336         INIT_GPIO_DESC_MUXED(WEMUX2, 40);
337         INIT_GPIO_DESC_MUXED(WEMUX2, 36);
338 }
339 #else
340 static inline void pxa27x_mfp_init(void) {}
341 #endif /* CONFIG_PXA27x */
342 
343 #ifdef CONFIG_PM
344 static unsigned long saved_gafr[2][4];
345 static unsigned long saved_gpdr[4];
346 static unsigned long saved_gplr[4];
347 static unsigned long saved_pgsr[4];
348 
349 static int pxa2xx_mfp_suspend(void)
350 {
351         int i;
352 
353         /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */
354         for (i = 0; i < pxa_last_gpio; i++) {
355                 if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
356                     (GPDR(i) & GPIO_bit(i))) {
357                         if (GPLR(i) & GPIO_bit(i))
358                                 PGSR(gpio_to_bank(i)) |= GPIO_bit(i);
359                         else
360                                 PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i);
361                 }
362         }
363 
364         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
365                 saved_gafr[0][i] = GAFR_L(i);
366                 saved_gafr[1][i] = GAFR_U(i);
367                 saved_gpdr[i] = GPDR(i * 32);
368                 saved_gplr[i] = GPLR(i * 32);
369                 saved_pgsr[i] = PGSR(i);
370 
371                 GPSR(i * 32) = PGSR(i);
372                 GPCR(i * 32) = ~PGSR(i);
373         }
374 
375         /* set GPDR bits taking into account MFP_LPM_KEEP_OUTPUT */
376         for (i = 0; i < pxa_last_gpio; i++) {
377                 if ((gpdr_lpm[gpio_to_bank(i)] & GPIO_bit(i)) ||
378                     ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
379                      (saved_gpdr[gpio_to_bank(i)] & GPIO_bit(i))))
380                         GPDR(i) |= GPIO_bit(i);
381                 else
382                         GPDR(i) &= ~GPIO_bit(i);
383         }
384 
385         return 0;
386 }
387 
388 static void pxa2xx_mfp_resume(void)
389 {
390         int i;
391 
392         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
393                 GAFR_L(i) = saved_gafr[0][i];
394                 GAFR_U(i) = saved_gafr[1][i];
395                 GPSR(i * 32) = saved_gplr[i];
396                 GPCR(i * 32) = ~saved_gplr[i];
397                 GPDR(i * 32) = saved_gpdr[i];
398                 PGSR(i) = saved_pgsr[i];
399         }
400         PSSR = PSSR_RDH | PSSR_PH;
401 }
402 #else
403 #define pxa2xx_mfp_suspend      NULL
404 #define pxa2xx_mfp_resume       NULL
405 #endif
406 
407 struct syscore_ops pxa2xx_mfp_syscore_ops = {
408         .suspend        = pxa2xx_mfp_suspend,
409         .resume         = pxa2xx_mfp_resume,
410 };
411 
412 static int __init pxa2xx_mfp_init(void)
413 {
414         int i;
415 
416         if (!cpu_is_pxa2xx())
417                 return 0;
418 
419         if (cpu_is_pxa25x())
420                 pxa25x_mfp_init();
421 
422         if (cpu_is_pxa27x())
423                 pxa27x_mfp_init();
424 
425         /* clear RDH bit to enable GPIO receivers after reset/sleep exit */
426         PSSR = PSSR_RDH;
427 
428         /* initialize gafr_run[], pgsr_lpm[] from existing values */
429         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
430                 gpdr_lpm[i] = GPDR(i * 32);
431 
432         return 0;
433 }
434 postcore_initcall(pxa2xx_mfp_init);
435 

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