xref: /openbmc/linux/arch/arm/mach-pxa/mfp-pxa2xx.c (revision c819e2cf)
1 /*
2  *  linux/arch/arm/mach-pxa/mfp-pxa2xx.c
3  *
4  *  PXA2xx pin mux configuration support
5  *
6  *  The GPIOs on PXA2xx can be configured as one of many alternate
7  *  functions, this is by concept samilar to the MFP configuration
8  *  on PXA3xx,  what's more important, the low power pin state and
9  *  wakeup detection are also supported by the same framework.
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 #include <linux/gpio.h>
16 #include <linux/gpio-pxa.h>
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/init.h>
20 #include <linux/io.h>
21 #include <linux/syscore_ops.h>
22 
23 #include <mach/pxa2xx-regs.h>
24 #include <mach/mfp-pxa2xx.h>
25 
26 #include "generic.h"
27 
28 #define PGSR(x)		__REG2(0x40F00020, (x) << 2)
29 #define __GAFR(u, x)	__REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3)
30 #define GAFR_L(x)	__GAFR(0, x)
31 #define GAFR_U(x)	__GAFR(1, x)
32 
33 #define BANK_OFF(n)	(((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2))
34 #define GPLR(x)		__REG2(0x40E00000, BANK_OFF((x) >> 5))
35 #define GPDR(x)		__REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x0c)
36 #define GPSR(x)		__REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x18)
37 #define GPCR(x)		__REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x24)
38 
39 #define PWER_WE35	(1 << 24)
40 
41 struct gpio_desc {
42 	unsigned	valid		: 1;
43 	unsigned	can_wakeup	: 1;
44 	unsigned	keypad_gpio	: 1;
45 	unsigned	dir_inverted	: 1;
46 	unsigned int	mask; /* bit mask in PWER or PKWR */
47 	unsigned int	mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
48 	unsigned long	config;
49 };
50 
51 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
52 
53 static unsigned long gpdr_lpm[4];
54 
55 static int __mfp_config_gpio(unsigned gpio, unsigned long c)
56 {
57 	unsigned long gafr, mask = GPIO_bit(gpio);
58 	int bank = gpio_to_bank(gpio);
59 	int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
60 	int shft = (gpio & 0xf) << 1;
61 	int fn = MFP_AF(c);
62 	int is_out = (c & MFP_DIR_OUT) ? 1 : 0;
63 
64 	if (fn > 3)
65 		return -EINVAL;
66 
67 	/* alternate function and direction at run-time */
68 	gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
69 	gafr = (gafr & ~(0x3 << shft)) | (fn << shft);
70 
71 	if (uorl == 0)
72 		GAFR_L(bank) = gafr;
73 	else
74 		GAFR_U(bank) = gafr;
75 
76 	if (is_out ^ gpio_desc[gpio].dir_inverted)
77 		GPDR(gpio) |= mask;
78 	else
79 		GPDR(gpio) &= ~mask;
80 
81 	/* alternate function and direction at low power mode */
82 	switch (c & MFP_LPM_STATE_MASK) {
83 	case MFP_LPM_DRIVE_HIGH:
84 		PGSR(bank) |= mask;
85 		is_out = 1;
86 		break;
87 	case MFP_LPM_DRIVE_LOW:
88 		PGSR(bank) &= ~mask;
89 		is_out = 1;
90 		break;
91 	case MFP_LPM_INPUT:
92 	case MFP_LPM_DEFAULT:
93 		break;
94 	default:
95 		/* warning and fall through, treat as MFP_LPM_DEFAULT */
96 		pr_warn("%s: GPIO%d: unsupported low power mode\n",
97 			__func__, gpio);
98 		break;
99 	}
100 
101 	if (is_out ^ gpio_desc[gpio].dir_inverted)
102 		gpdr_lpm[bank] |= mask;
103 	else
104 		gpdr_lpm[bank] &= ~mask;
105 
106 	/* give early warning if MFP_LPM_CAN_WAKEUP is set on the
107 	 * configurations of those pins not able to wakeup
108 	 */
109 	if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
110 		pr_warn("%s: GPIO%d unable to wakeup\n", __func__, gpio);
111 		return -EINVAL;
112 	}
113 
114 	if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
115 		pr_warn("%s: output GPIO%d unable to wakeup\n", __func__, gpio);
116 		return -EINVAL;
117 	}
118 
119 	return 0;
120 }
121 
122 static inline int __mfp_validate(int mfp)
123 {
124 	int gpio = mfp_to_gpio(mfp);
125 
126 	if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
127 		pr_warn("%s: GPIO%d is invalid pin\n", __func__, gpio);
128 		return -1;
129 	}
130 
131 	return gpio;
132 }
133 
134 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
135 {
136 	unsigned long flags;
137 	unsigned long *c;
138 	int i, gpio;
139 
140 	for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
141 
142 		gpio = __mfp_validate(MFP_PIN(*c));
143 		if (gpio < 0)
144 			continue;
145 
146 		local_irq_save(flags);
147 
148 		gpio_desc[gpio].config = *c;
149 		__mfp_config_gpio(gpio, *c);
150 
151 		local_irq_restore(flags);
152 	}
153 }
154 
155 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
156 {
157 	unsigned long flags, c;
158 	int gpio;
159 
160 	gpio = __mfp_validate(mfp);
161 	if (gpio < 0)
162 		return;
163 
164 	local_irq_save(flags);
165 
166 	c = gpio_desc[gpio].config;
167 	c = (c & ~MFP_LPM_STATE_MASK) | lpm;
168 	__mfp_config_gpio(gpio, c);
169 
170 	local_irq_restore(flags);
171 }
172 
173 int gpio_set_wake(unsigned int gpio, unsigned int on)
174 {
175 	struct gpio_desc *d;
176 	unsigned long c, mux_taken;
177 
178 	if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
179 		return -EINVAL;
180 
181 	d = &gpio_desc[gpio];
182 	c = d->config;
183 
184 	if (!d->valid)
185 		return -EINVAL;
186 
187 	/* Allow keypad GPIOs to wakeup system when
188 	 * configured as generic GPIOs.
189 	 */
190 	if (d->keypad_gpio && (MFP_AF(d->config) == 0) &&
191 	    (d->config & MFP_LPM_CAN_WAKEUP)) {
192 		if (on)
193 			PKWR |= d->mask;
194 		else
195 			PKWR &= ~d->mask;
196 		return 0;
197 	}
198 
199 	mux_taken = (PWER & d->mux_mask) & (~d->mask);
200 	if (on && mux_taken)
201 		return -EBUSY;
202 
203 	if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
204 		if (on) {
205 			PWER = (PWER & ~d->mux_mask) | d->mask;
206 
207 			if (c & MFP_LPM_EDGE_RISE)
208 				PRER |= d->mask;
209 			else
210 				PRER &= ~d->mask;
211 
212 			if (c & MFP_LPM_EDGE_FALL)
213 				PFER |= d->mask;
214 			else
215 				PFER &= ~d->mask;
216 		} else {
217 			PWER &= ~d->mask;
218 			PRER &= ~d->mask;
219 			PFER &= ~d->mask;
220 		}
221 	}
222 	return 0;
223 }
224 
225 #ifdef CONFIG_PXA25x
226 static void __init pxa25x_mfp_init(void)
227 {
228 	int i;
229 
230 	/* running before pxa_gpio_probe() */
231 #ifdef CONFIG_CPU_PXA26x
232 	pxa_last_gpio = 89;
233 #else
234 	pxa_last_gpio = 84;
235 #endif
236 	for (i = 0; i <= pxa_last_gpio; i++)
237 		gpio_desc[i].valid = 1;
238 
239 	for (i = 0; i <= 15; i++) {
240 		gpio_desc[i].can_wakeup = 1;
241 		gpio_desc[i].mask = GPIO_bit(i);
242 	}
243 
244 	/* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
245 	 * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
246 	 */
247 	for (i = 86; i <= pxa_last_gpio; i++)
248 		gpio_desc[i].dir_inverted = 1;
249 }
250 #else
251 static inline void pxa25x_mfp_init(void) {}
252 #endif /* CONFIG_PXA25x */
253 
254 #ifdef CONFIG_PXA27x
255 static int pxa27x_pkwr_gpio[] = {
256 	13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
257 	95, 96, 97, 98, 99, 100, 101, 102
258 };
259 
260 int keypad_set_wake(unsigned int on)
261 {
262 	unsigned int i, gpio, mask = 0;
263 	struct gpio_desc *d;
264 
265 	for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
266 
267 		gpio = pxa27x_pkwr_gpio[i];
268 		d = &gpio_desc[gpio];
269 
270 		/* skip if configured as generic GPIO */
271 		if (MFP_AF(d->config) == 0)
272 			continue;
273 
274 		if (d->config & MFP_LPM_CAN_WAKEUP)
275 			mask |= gpio_desc[gpio].mask;
276 	}
277 
278 	if (on)
279 		PKWR |= mask;
280 	else
281 		PKWR &= ~mask;
282 	return 0;
283 }
284 
285 #define PWER_WEMUX2_GPIO38	(1 << 16)
286 #define PWER_WEMUX2_GPIO53	(2 << 16)
287 #define PWER_WEMUX2_GPIO40	(3 << 16)
288 #define PWER_WEMUX2_GPIO36	(4 << 16)
289 #define PWER_WEMUX2_MASK	(7 << 16)
290 #define PWER_WEMUX3_GPIO31	(1 << 19)
291 #define PWER_WEMUX3_GPIO113	(2 << 19)
292 #define PWER_WEMUX3_MASK	(3 << 19)
293 
294 #define INIT_GPIO_DESC_MUXED(mux, gpio)				\
295 do {								\
296 	gpio_desc[(gpio)].can_wakeup = 1;			\
297 	gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio;	\
298 	gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK;	\
299 } while (0)
300 
301 static void __init pxa27x_mfp_init(void)
302 {
303 	int i, gpio;
304 
305 	pxa_last_gpio = 120;	/* running before pxa_gpio_probe() */
306 	for (i = 0; i <= pxa_last_gpio; i++) {
307 		/* skip GPIO2, 5, 6, 7, 8, they are not
308 		 * valid pins allow configuration
309 		 */
310 		if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
311 			continue;
312 
313 		gpio_desc[i].valid = 1;
314 	}
315 
316 	/* Keypad GPIOs */
317 	for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
318 		gpio = pxa27x_pkwr_gpio[i];
319 		gpio_desc[gpio].can_wakeup = 1;
320 		gpio_desc[gpio].keypad_gpio = 1;
321 		gpio_desc[gpio].mask = 1 << i;
322 	}
323 
324 	/* Overwrite GPIO13 as a PWER wakeup source */
325 	for (i = 0; i <= 15; i++) {
326 		/* skip GPIO2, 5, 6, 7, 8 */
327 		if (GPIO_bit(i) & 0x1e4)
328 			continue;
329 
330 		gpio_desc[i].can_wakeup = 1;
331 		gpio_desc[i].mask = GPIO_bit(i);
332 	}
333 
334 	gpio_desc[35].can_wakeup = 1;
335 	gpio_desc[35].mask = PWER_WE35;
336 
337 	INIT_GPIO_DESC_MUXED(WEMUX3, 31);
338 	INIT_GPIO_DESC_MUXED(WEMUX3, 113);
339 	INIT_GPIO_DESC_MUXED(WEMUX2, 38);
340 	INIT_GPIO_DESC_MUXED(WEMUX2, 53);
341 	INIT_GPIO_DESC_MUXED(WEMUX2, 40);
342 	INIT_GPIO_DESC_MUXED(WEMUX2, 36);
343 }
344 #else
345 static inline void pxa27x_mfp_init(void) {}
346 #endif /* CONFIG_PXA27x */
347 
348 #ifdef CONFIG_PM
349 static unsigned long saved_gafr[2][4];
350 static unsigned long saved_gpdr[4];
351 static unsigned long saved_gplr[4];
352 static unsigned long saved_pgsr[4];
353 
354 static int pxa2xx_mfp_suspend(void)
355 {
356 	int i;
357 
358 	/* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */
359 	for (i = 0; i < pxa_last_gpio; i++) {
360 		if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
361 		    (GPDR(i) & GPIO_bit(i))) {
362 			if (GPLR(i) & GPIO_bit(i))
363 				PGSR(gpio_to_bank(i)) |= GPIO_bit(i);
364 			else
365 				PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i);
366 		}
367 	}
368 
369 	for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
370 		saved_gafr[0][i] = GAFR_L(i);
371 		saved_gafr[1][i] = GAFR_U(i);
372 		saved_gpdr[i] = GPDR(i * 32);
373 		saved_gplr[i] = GPLR(i * 32);
374 		saved_pgsr[i] = PGSR(i);
375 
376 		GPSR(i * 32) = PGSR(i);
377 		GPCR(i * 32) = ~PGSR(i);
378 	}
379 
380 	/* set GPDR bits taking into account MFP_LPM_KEEP_OUTPUT */
381 	for (i = 0; i < pxa_last_gpio; i++) {
382 		if ((gpdr_lpm[gpio_to_bank(i)] & GPIO_bit(i)) ||
383 		    ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
384 		     (saved_gpdr[gpio_to_bank(i)] & GPIO_bit(i))))
385 			GPDR(i) |= GPIO_bit(i);
386 		else
387 			GPDR(i) &= ~GPIO_bit(i);
388 	}
389 
390 	return 0;
391 }
392 
393 static void pxa2xx_mfp_resume(void)
394 {
395 	int i;
396 
397 	for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
398 		GAFR_L(i) = saved_gafr[0][i];
399 		GAFR_U(i) = saved_gafr[1][i];
400 		GPSR(i * 32) = saved_gplr[i];
401 		GPCR(i * 32) = ~saved_gplr[i];
402 		GPDR(i * 32) = saved_gpdr[i];
403 		PGSR(i) = saved_pgsr[i];
404 	}
405 	PSSR = PSSR_RDH | PSSR_PH;
406 }
407 #else
408 #define pxa2xx_mfp_suspend	NULL
409 #define pxa2xx_mfp_resume	NULL
410 #endif
411 
412 struct syscore_ops pxa2xx_mfp_syscore_ops = {
413 	.suspend	= pxa2xx_mfp_suspend,
414 	.resume		= pxa2xx_mfp_resume,
415 };
416 
417 static int __init pxa2xx_mfp_init(void)
418 {
419 	int i;
420 
421 	if (!cpu_is_pxa2xx())
422 		return 0;
423 
424 	if (cpu_is_pxa25x())
425 		pxa25x_mfp_init();
426 
427 	if (cpu_is_pxa27x())
428 		pxa27x_mfp_init();
429 
430 	/* clear RDH bit to enable GPIO receivers after reset/sleep exit */
431 	PSSR = PSSR_RDH;
432 
433 	/* initialize gafr_run[], pgsr_lpm[] from existing values */
434 	for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
435 		gpdr_lpm[i] = GPDR(i * 32);
436 
437 	return 0;
438 }
439 postcore_initcall(pxa2xx_mfp_init);
440