1 /*
2 * driver/mfd/asic3.c
3 *
4 * Compaq ASIC3 support.
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 as
8 * published by the Free Software Foundation.
9 *
10 * Copyright 2001 Compaq Computer Corporation.
11 * Copyright 2004-2005 Phil Blundell
12 * Copyright 2007-2008 OpenedHand Ltd.
13 *
14 * Authors: Phil Blundell <pb@handhelds.org>,
15 * Samuel Ortiz <sameo@openedhand.com>
16 *
17 */
18
19 #include <linux/kernel.h>
20 #include <linux/delay.h>
21 #include <linux/irq.h>
22 #include <linux/gpio.h>
23 #include <linux/export.h>
24 #include <linux/io.h>
25 #include <linux/slab.h>
26 #include <linux/spinlock.h>
27 #include <linux/platform_device.h>
28
29 #include <linux/mfd/asic3.h>
30 #include <linux/mfd/core.h>
31 #include <linux/mfd/ds1wm.h>
32 #include <linux/mfd/tmio.h>
33
34 enum {
35 ASIC3_CLOCK_SPI,
36 ASIC3_CLOCK_OWM,
37 ASIC3_CLOCK_PWM0,
38 ASIC3_CLOCK_PWM1,
39 ASIC3_CLOCK_LED0,
40 ASIC3_CLOCK_LED1,
41 ASIC3_CLOCK_LED2,
42 ASIC3_CLOCK_SD_HOST,
43 ASIC3_CLOCK_SD_BUS,
44 ASIC3_CLOCK_SMBUS,
45 ASIC3_CLOCK_EX0,
46 ASIC3_CLOCK_EX1,
47 };
48
49 struct asic3_clk {
50 int enabled;
51 unsigned int cdex;
52 unsigned long rate;
53 };
54
55 #define INIT_CDEX(_name, _rate) \
56 [ASIC3_CLOCK_##_name] = { \
57 .cdex = CLOCK_CDEX_##_name, \
58 .rate = _rate, \
59 }
60
61 static struct asic3_clk asic3_clk_init[] __initdata = {
62 INIT_CDEX(SPI, 0),
63 INIT_CDEX(OWM, 5000000),
64 INIT_CDEX(PWM0, 0),
65 INIT_CDEX(PWM1, 0),
66 INIT_CDEX(LED0, 0),
67 INIT_CDEX(LED1, 0),
68 INIT_CDEX(LED2, 0),
69 INIT_CDEX(SD_HOST, 24576000),
70 INIT_CDEX(SD_BUS, 12288000),
71 INIT_CDEX(SMBUS, 0),
72 INIT_CDEX(EX0, 32768),
73 INIT_CDEX(EX1, 24576000),
74 };
75
76 struct asic3 {
77 void __iomem *mapping;
78 unsigned int bus_shift;
79 unsigned int irq_nr;
80 unsigned int irq_base;
81 spinlock_t lock;
82 u16 irq_bothedge[4];
83 struct gpio_chip gpio;
84 struct device *dev;
85 void __iomem *tmio_cnf;
86
87 struct asic3_clk clocks[ARRAY_SIZE(asic3_clk_init)];
88 };
89
90 static int asic3_gpio_get(struct gpio_chip *chip, unsigned offset);
91
asic3_write_register(struct asic3 * asic,unsigned int reg,u32 value)92 void asic3_write_register(struct asic3 *asic, unsigned int reg, u32 value)
93 {
94 iowrite16(value, asic->mapping +
95 (reg >> asic->bus_shift));
96 }
97 EXPORT_SYMBOL_GPL(asic3_write_register);
98
asic3_read_register(struct asic3 * asic,unsigned int reg)99 u32 asic3_read_register(struct asic3 *asic, unsigned int reg)
100 {
101 return ioread16(asic->mapping +
102 (reg >> asic->bus_shift));
103 }
104 EXPORT_SYMBOL_GPL(asic3_read_register);
105
asic3_set_register(struct asic3 * asic,u32 reg,u32 bits,bool set)106 static void asic3_set_register(struct asic3 *asic, u32 reg, u32 bits, bool set)
107 {
108 unsigned long flags;
109 u32 val;
110
111 spin_lock_irqsave(&asic->lock, flags);
112 val = asic3_read_register(asic, reg);
113 if (set)
114 val |= bits;
115 else
116 val &= ~bits;
117 asic3_write_register(asic, reg, val);
118 spin_unlock_irqrestore(&asic->lock, flags);
119 }
120
121 /* IRQs */
122 #define MAX_ASIC_ISR_LOOPS 20
123 #define ASIC3_GPIO_BASE_INCR \
124 (ASIC3_GPIO_B_BASE - ASIC3_GPIO_A_BASE)
125
asic3_irq_flip_edge(struct asic3 * asic,u32 base,int bit)126 static void asic3_irq_flip_edge(struct asic3 *asic,
127 u32 base, int bit)
128 {
129 u16 edge;
130 unsigned long flags;
131
132 spin_lock_irqsave(&asic->lock, flags);
133 edge = asic3_read_register(asic,
134 base + ASIC3_GPIO_EDGE_TRIGGER);
135 edge ^= bit;
136 asic3_write_register(asic,
137 base + ASIC3_GPIO_EDGE_TRIGGER, edge);
138 spin_unlock_irqrestore(&asic->lock, flags);
139 }
140
asic3_irq_demux(struct irq_desc * desc)141 static void asic3_irq_demux(struct irq_desc *desc)
142 {
143 struct asic3 *asic = irq_desc_get_handler_data(desc);
144 struct irq_data *data = irq_desc_get_irq_data(desc);
145 int iter, i;
146 unsigned long flags;
147
148 data->chip->irq_ack(data);
149
150 for (iter = 0 ; iter < MAX_ASIC_ISR_LOOPS; iter++) {
151 u32 status;
152 int bank;
153
154 spin_lock_irqsave(&asic->lock, flags);
155 status = asic3_read_register(asic,
156 ASIC3_OFFSET(INTR, P_INT_STAT));
157 spin_unlock_irqrestore(&asic->lock, flags);
158
159 /* Check all ten register bits */
160 if ((status & 0x3ff) == 0)
161 break;
162
163 /* Handle GPIO IRQs */
164 for (bank = 0; bank < ASIC3_NUM_GPIO_BANKS; bank++) {
165 if (status & (1 << bank)) {
166 unsigned long base, istat;
167
168 base = ASIC3_GPIO_A_BASE
169 + bank * ASIC3_GPIO_BASE_INCR;
170
171 spin_lock_irqsave(&asic->lock, flags);
172 istat = asic3_read_register(asic,
173 base +
174 ASIC3_GPIO_INT_STATUS);
175 /* Clearing IntStatus */
176 asic3_write_register(asic,
177 base +
178 ASIC3_GPIO_INT_STATUS, 0);
179 spin_unlock_irqrestore(&asic->lock, flags);
180
181 for (i = 0; i < ASIC3_GPIOS_PER_BANK; i++) {
182 int bit = (1 << i);
183 unsigned int irqnr;
184
185 if (!(istat & bit))
186 continue;
187
188 irqnr = asic->irq_base +
189 (ASIC3_GPIOS_PER_BANK * bank)
190 + i;
191 generic_handle_irq(irqnr);
192 if (asic->irq_bothedge[bank] & bit)
193 asic3_irq_flip_edge(asic, base,
194 bit);
195 }
196 }
197 }
198
199 /* Handle remaining IRQs in the status register */
200 for (i = ASIC3_NUM_GPIOS; i < ASIC3_NR_IRQS; i++) {
201 /* They start at bit 4 and go up */
202 if (status & (1 << (i - ASIC3_NUM_GPIOS + 4)))
203 generic_handle_irq(asic->irq_base + i);
204 }
205 }
206
207 if (iter >= MAX_ASIC_ISR_LOOPS)
208 dev_err(asic->dev, "interrupt processing overrun\n");
209 }
210
asic3_irq_to_bank(struct asic3 * asic,int irq)211 static inline int asic3_irq_to_bank(struct asic3 *asic, int irq)
212 {
213 int n;
214
215 n = (irq - asic->irq_base) >> 4;
216
217 return (n * (ASIC3_GPIO_B_BASE - ASIC3_GPIO_A_BASE));
218 }
219
asic3_irq_to_index(struct asic3 * asic,int irq)220 static inline int asic3_irq_to_index(struct asic3 *asic, int irq)
221 {
222 return (irq - asic->irq_base) & 0xf;
223 }
224
asic3_mask_gpio_irq(struct irq_data * data)225 static void asic3_mask_gpio_irq(struct irq_data *data)
226 {
227 struct asic3 *asic = irq_data_get_irq_chip_data(data);
228 u32 val, bank, index;
229 unsigned long flags;
230
231 bank = asic3_irq_to_bank(asic, data->irq);
232 index = asic3_irq_to_index(asic, data->irq);
233
234 spin_lock_irqsave(&asic->lock, flags);
235 val = asic3_read_register(asic, bank + ASIC3_GPIO_MASK);
236 val |= 1 << index;
237 asic3_write_register(asic, bank + ASIC3_GPIO_MASK, val);
238 spin_unlock_irqrestore(&asic->lock, flags);
239 }
240
asic3_mask_irq(struct irq_data * data)241 static void asic3_mask_irq(struct irq_data *data)
242 {
243 struct asic3 *asic = irq_data_get_irq_chip_data(data);
244 int regval;
245 unsigned long flags;
246
247 spin_lock_irqsave(&asic->lock, flags);
248 regval = asic3_read_register(asic,
249 ASIC3_INTR_BASE +
250 ASIC3_INTR_INT_MASK);
251
252 regval &= ~(ASIC3_INTMASK_MASK0 <<
253 (data->irq - (asic->irq_base + ASIC3_NUM_GPIOS)));
254
255 asic3_write_register(asic,
256 ASIC3_INTR_BASE +
257 ASIC3_INTR_INT_MASK,
258 regval);
259 spin_unlock_irqrestore(&asic->lock, flags);
260 }
261
asic3_unmask_gpio_irq(struct irq_data * data)262 static void asic3_unmask_gpio_irq(struct irq_data *data)
263 {
264 struct asic3 *asic = irq_data_get_irq_chip_data(data);
265 u32 val, bank, index;
266 unsigned long flags;
267
268 bank = asic3_irq_to_bank(asic, data->irq);
269 index = asic3_irq_to_index(asic, data->irq);
270
271 spin_lock_irqsave(&asic->lock, flags);
272 val = asic3_read_register(asic, bank + ASIC3_GPIO_MASK);
273 val &= ~(1 << index);
274 asic3_write_register(asic, bank + ASIC3_GPIO_MASK, val);
275 spin_unlock_irqrestore(&asic->lock, flags);
276 }
277
asic3_unmask_irq(struct irq_data * data)278 static void asic3_unmask_irq(struct irq_data *data)
279 {
280 struct asic3 *asic = irq_data_get_irq_chip_data(data);
281 int regval;
282 unsigned long flags;
283
284 spin_lock_irqsave(&asic->lock, flags);
285 regval = asic3_read_register(asic,
286 ASIC3_INTR_BASE +
287 ASIC3_INTR_INT_MASK);
288
289 regval |= (ASIC3_INTMASK_MASK0 <<
290 (data->irq - (asic->irq_base + ASIC3_NUM_GPIOS)));
291
292 asic3_write_register(asic,
293 ASIC3_INTR_BASE +
294 ASIC3_INTR_INT_MASK,
295 regval);
296 spin_unlock_irqrestore(&asic->lock, flags);
297 }
298
asic3_gpio_irq_type(struct irq_data * data,unsigned int type)299 static int asic3_gpio_irq_type(struct irq_data *data, unsigned int type)
300 {
301 struct asic3 *asic = irq_data_get_irq_chip_data(data);
302 u32 bank, index;
303 u16 trigger, level, edge, bit;
304 unsigned long flags;
305
306 bank = asic3_irq_to_bank(asic, data->irq);
307 index = asic3_irq_to_index(asic, data->irq);
308 bit = 1<<index;
309
310 spin_lock_irqsave(&asic->lock, flags);
311 level = asic3_read_register(asic,
312 bank + ASIC3_GPIO_LEVEL_TRIGGER);
313 edge = asic3_read_register(asic,
314 bank + ASIC3_GPIO_EDGE_TRIGGER);
315 trigger = asic3_read_register(asic,
316 bank + ASIC3_GPIO_TRIGGER_TYPE);
317 asic->irq_bothedge[(data->irq - asic->irq_base) >> 4] &= ~bit;
318
319 if (type == IRQ_TYPE_EDGE_RISING) {
320 trigger |= bit;
321 edge |= bit;
322 } else if (type == IRQ_TYPE_EDGE_FALLING) {
323 trigger |= bit;
324 edge &= ~bit;
325 } else if (type == IRQ_TYPE_EDGE_BOTH) {
326 trigger |= bit;
327 if (asic3_gpio_get(&asic->gpio, data->irq - asic->irq_base))
328 edge &= ~bit;
329 else
330 edge |= bit;
331 asic->irq_bothedge[(data->irq - asic->irq_base) >> 4] |= bit;
332 } else if (type == IRQ_TYPE_LEVEL_LOW) {
333 trigger &= ~bit;
334 level &= ~bit;
335 } else if (type == IRQ_TYPE_LEVEL_HIGH) {
336 trigger &= ~bit;
337 level |= bit;
338 } else {
339 /*
340 * if type == IRQ_TYPE_NONE, we should mask interrupts, but
341 * be careful to not unmask them if mask was also called.
342 * Probably need internal state for mask.
343 */
344 dev_notice(asic->dev, "irq type not changed\n");
345 }
346 asic3_write_register(asic, bank + ASIC3_GPIO_LEVEL_TRIGGER,
347 level);
348 asic3_write_register(asic, bank + ASIC3_GPIO_EDGE_TRIGGER,
349 edge);
350 asic3_write_register(asic, bank + ASIC3_GPIO_TRIGGER_TYPE,
351 trigger);
352 spin_unlock_irqrestore(&asic->lock, flags);
353 return 0;
354 }
355
asic3_gpio_irq_set_wake(struct irq_data * data,unsigned int on)356 static int asic3_gpio_irq_set_wake(struct irq_data *data, unsigned int on)
357 {
358 struct asic3 *asic = irq_data_get_irq_chip_data(data);
359 u32 bank, index;
360 u16 bit;
361
362 bank = asic3_irq_to_bank(asic, data->irq);
363 index = asic3_irq_to_index(asic, data->irq);
364 bit = 1<<index;
365
366 asic3_set_register(asic, bank + ASIC3_GPIO_SLEEP_MASK, bit, !on);
367
368 return 0;
369 }
370
371 static struct irq_chip asic3_gpio_irq_chip = {
372 .name = "ASIC3-GPIO",
373 .irq_ack = asic3_mask_gpio_irq,
374 .irq_mask = asic3_mask_gpio_irq,
375 .irq_unmask = asic3_unmask_gpio_irq,
376 .irq_set_type = asic3_gpio_irq_type,
377 .irq_set_wake = asic3_gpio_irq_set_wake,
378 };
379
380 static struct irq_chip asic3_irq_chip = {
381 .name = "ASIC3",
382 .irq_ack = asic3_mask_irq,
383 .irq_mask = asic3_mask_irq,
384 .irq_unmask = asic3_unmask_irq,
385 };
386
asic3_irq_probe(struct platform_device * pdev)387 static int __init asic3_irq_probe(struct platform_device *pdev)
388 {
389 struct asic3 *asic = platform_get_drvdata(pdev);
390 unsigned long clksel = 0;
391 unsigned int irq, irq_base;
392 int ret;
393
394 ret = platform_get_irq(pdev, 0);
395 if (ret < 0)
396 return ret;
397 asic->irq_nr = ret;
398
399 /* turn on clock to IRQ controller */
400 clksel |= CLOCK_SEL_CX;
401 asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL),
402 clksel);
403
404 irq_base = asic->irq_base;
405
406 for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) {
407 if (irq < asic->irq_base + ASIC3_NUM_GPIOS)
408 irq_set_chip(irq, &asic3_gpio_irq_chip);
409 else
410 irq_set_chip(irq, &asic3_irq_chip);
411
412 irq_set_chip_data(irq, asic);
413 irq_set_handler(irq, handle_level_irq);
414 irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
415 }
416
417 asic3_write_register(asic, ASIC3_OFFSET(INTR, INT_MASK),
418 ASIC3_INTMASK_GINTMASK);
419
420 irq_set_chained_handler_and_data(asic->irq_nr, asic3_irq_demux, asic);
421 irq_set_irq_type(asic->irq_nr, IRQ_TYPE_EDGE_RISING);
422
423 return 0;
424 }
425
asic3_irq_remove(struct platform_device * pdev)426 static void asic3_irq_remove(struct platform_device *pdev)
427 {
428 struct asic3 *asic = platform_get_drvdata(pdev);
429 unsigned int irq, irq_base;
430
431 irq_base = asic->irq_base;
432
433 for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) {
434 irq_set_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
435 irq_set_chip_and_handler(irq, NULL, NULL);
436 irq_set_chip_data(irq, NULL);
437 }
438 irq_set_chained_handler(asic->irq_nr, NULL);
439 }
440
441 /* GPIOs */
asic3_gpio_direction(struct gpio_chip * chip,unsigned offset,int out)442 static int asic3_gpio_direction(struct gpio_chip *chip,
443 unsigned offset, int out)
444 {
445 u32 mask = ASIC3_GPIO_TO_MASK(offset), out_reg;
446 unsigned int gpio_base;
447 unsigned long flags;
448 struct asic3 *asic;
449
450 asic = container_of(chip, struct asic3, gpio);
451 gpio_base = ASIC3_GPIO_TO_BASE(offset);
452
453 if (gpio_base > ASIC3_GPIO_D_BASE) {
454 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
455 gpio_base, offset);
456 return -EINVAL;
457 }
458
459 spin_lock_irqsave(&asic->lock, flags);
460
461 out_reg = asic3_read_register(asic, gpio_base + ASIC3_GPIO_DIRECTION);
462
463 /* Input is 0, Output is 1 */
464 if (out)
465 out_reg |= mask;
466 else
467 out_reg &= ~mask;
468
469 asic3_write_register(asic, gpio_base + ASIC3_GPIO_DIRECTION, out_reg);
470
471 spin_unlock_irqrestore(&asic->lock, flags);
472
473 return 0;
474
475 }
476
asic3_gpio_direction_input(struct gpio_chip * chip,unsigned offset)477 static int asic3_gpio_direction_input(struct gpio_chip *chip,
478 unsigned offset)
479 {
480 return asic3_gpio_direction(chip, offset, 0);
481 }
482
asic3_gpio_direction_output(struct gpio_chip * chip,unsigned offset,int value)483 static int asic3_gpio_direction_output(struct gpio_chip *chip,
484 unsigned offset, int value)
485 {
486 return asic3_gpio_direction(chip, offset, 1);
487 }
488
asic3_gpio_get(struct gpio_chip * chip,unsigned offset)489 static int asic3_gpio_get(struct gpio_chip *chip,
490 unsigned offset)
491 {
492 unsigned int gpio_base;
493 u32 mask = ASIC3_GPIO_TO_MASK(offset);
494 struct asic3 *asic;
495
496 asic = container_of(chip, struct asic3, gpio);
497 gpio_base = ASIC3_GPIO_TO_BASE(offset);
498
499 if (gpio_base > ASIC3_GPIO_D_BASE) {
500 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
501 gpio_base, offset);
502 return -EINVAL;
503 }
504
505 return asic3_read_register(asic, gpio_base + ASIC3_GPIO_STATUS) & mask;
506 }
507
asic3_gpio_set(struct gpio_chip * chip,unsigned offset,int value)508 static void asic3_gpio_set(struct gpio_chip *chip,
509 unsigned offset, int value)
510 {
511 u32 mask, out_reg;
512 unsigned int gpio_base;
513 unsigned long flags;
514 struct asic3 *asic;
515
516 asic = container_of(chip, struct asic3, gpio);
517 gpio_base = ASIC3_GPIO_TO_BASE(offset);
518
519 if (gpio_base > ASIC3_GPIO_D_BASE) {
520 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
521 gpio_base, offset);
522 return;
523 }
524
525 mask = ASIC3_GPIO_TO_MASK(offset);
526
527 spin_lock_irqsave(&asic->lock, flags);
528
529 out_reg = asic3_read_register(asic, gpio_base + ASIC3_GPIO_OUT);
530
531 if (value)
532 out_reg |= mask;
533 else
534 out_reg &= ~mask;
535
536 asic3_write_register(asic, gpio_base + ASIC3_GPIO_OUT, out_reg);
537
538 spin_unlock_irqrestore(&asic->lock, flags);
539
540 return;
541 }
542
asic3_gpio_to_irq(struct gpio_chip * chip,unsigned offset)543 static int asic3_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
544 {
545 struct asic3 *asic = container_of(chip, struct asic3, gpio);
546
547 return asic->irq_base + offset;
548 }
549
asic3_gpio_probe(struct platform_device * pdev,u16 * gpio_config,int num)550 static __init int asic3_gpio_probe(struct platform_device *pdev,
551 u16 *gpio_config, int num)
552 {
553 struct asic3 *asic = platform_get_drvdata(pdev);
554 u16 alt_reg[ASIC3_NUM_GPIO_BANKS];
555 u16 out_reg[ASIC3_NUM_GPIO_BANKS];
556 u16 dir_reg[ASIC3_NUM_GPIO_BANKS];
557 int i;
558
559 memset(alt_reg, 0, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
560 memset(out_reg, 0, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
561 memset(dir_reg, 0, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
562
563 /* Enable all GPIOs */
564 asic3_write_register(asic, ASIC3_GPIO_OFFSET(A, MASK), 0xffff);
565 asic3_write_register(asic, ASIC3_GPIO_OFFSET(B, MASK), 0xffff);
566 asic3_write_register(asic, ASIC3_GPIO_OFFSET(C, MASK), 0xffff);
567 asic3_write_register(asic, ASIC3_GPIO_OFFSET(D, MASK), 0xffff);
568
569 for (i = 0; i < num; i++) {
570 u8 alt, pin, dir, init, bank_num, bit_num;
571 u16 config = gpio_config[i];
572
573 pin = ASIC3_CONFIG_GPIO_PIN(config);
574 alt = ASIC3_CONFIG_GPIO_ALT(config);
575 dir = ASIC3_CONFIG_GPIO_DIR(config);
576 init = ASIC3_CONFIG_GPIO_INIT(config);
577
578 bank_num = ASIC3_GPIO_TO_BANK(pin);
579 bit_num = ASIC3_GPIO_TO_BIT(pin);
580
581 alt_reg[bank_num] |= (alt << bit_num);
582 out_reg[bank_num] |= (init << bit_num);
583 dir_reg[bank_num] |= (dir << bit_num);
584 }
585
586 for (i = 0; i < ASIC3_NUM_GPIO_BANKS; i++) {
587 asic3_write_register(asic,
588 ASIC3_BANK_TO_BASE(i) +
589 ASIC3_GPIO_DIRECTION,
590 dir_reg[i]);
591 asic3_write_register(asic,
592 ASIC3_BANK_TO_BASE(i) + ASIC3_GPIO_OUT,
593 out_reg[i]);
594 asic3_write_register(asic,
595 ASIC3_BANK_TO_BASE(i) +
596 ASIC3_GPIO_ALT_FUNCTION,
597 alt_reg[i]);
598 }
599
600 return gpiochip_add(&asic->gpio);
601 }
602
asic3_gpio_remove(struct platform_device * pdev)603 static int asic3_gpio_remove(struct platform_device *pdev)
604 {
605 struct asic3 *asic = platform_get_drvdata(pdev);
606
607 gpiochip_remove(&asic->gpio);
608 return 0;
609 }
610
asic3_clk_enable(struct asic3 * asic,struct asic3_clk * clk)611 static void asic3_clk_enable(struct asic3 *asic, struct asic3_clk *clk)
612 {
613 unsigned long flags;
614 u32 cdex;
615
616 spin_lock_irqsave(&asic->lock, flags);
617 if (clk->enabled++ == 0) {
618 cdex = asic3_read_register(asic, ASIC3_OFFSET(CLOCK, CDEX));
619 cdex |= clk->cdex;
620 asic3_write_register(asic, ASIC3_OFFSET(CLOCK, CDEX), cdex);
621 }
622 spin_unlock_irqrestore(&asic->lock, flags);
623 }
624
asic3_clk_disable(struct asic3 * asic,struct asic3_clk * clk)625 static void asic3_clk_disable(struct asic3 *asic, struct asic3_clk *clk)
626 {
627 unsigned long flags;
628 u32 cdex;
629
630 WARN_ON(clk->enabled == 0);
631
632 spin_lock_irqsave(&asic->lock, flags);
633 if (--clk->enabled == 0) {
634 cdex = asic3_read_register(asic, ASIC3_OFFSET(CLOCK, CDEX));
635 cdex &= ~clk->cdex;
636 asic3_write_register(asic, ASIC3_OFFSET(CLOCK, CDEX), cdex);
637 }
638 spin_unlock_irqrestore(&asic->lock, flags);
639 }
640
641 /* MFD cells (SPI, PWM, LED, DS1WM, MMC) */
642 static struct ds1wm_driver_data ds1wm_pdata = {
643 .active_high = 1,
644 .reset_recover_delay = 1,
645 };
646
647 static struct resource ds1wm_resources[] = {
648 {
649 .start = ASIC3_OWM_BASE,
650 .end = ASIC3_OWM_BASE + 0x13,
651 .flags = IORESOURCE_MEM,
652 },
653 {
654 .start = ASIC3_IRQ_OWM,
655 .end = ASIC3_IRQ_OWM,
656 .flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE,
657 },
658 };
659
ds1wm_enable(struct platform_device * pdev)660 static int ds1wm_enable(struct platform_device *pdev)
661 {
662 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
663
664 /* Turn on external clocks and the OWM clock */
665 asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_EX0]);
666 asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_EX1]);
667 asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_OWM]);
668 msleep(1);
669
670 /* Reset and enable DS1WM */
671 asic3_set_register(asic, ASIC3_OFFSET(EXTCF, RESET),
672 ASIC3_EXTCF_OWM_RESET, 1);
673 msleep(1);
674 asic3_set_register(asic, ASIC3_OFFSET(EXTCF, RESET),
675 ASIC3_EXTCF_OWM_RESET, 0);
676 msleep(1);
677 asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
678 ASIC3_EXTCF_OWM_EN, 1);
679 msleep(1);
680
681 return 0;
682 }
683
ds1wm_disable(struct platform_device * pdev)684 static int ds1wm_disable(struct platform_device *pdev)
685 {
686 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
687
688 asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
689 ASIC3_EXTCF_OWM_EN, 0);
690
691 asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_OWM]);
692 asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_EX0]);
693 asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_EX1]);
694
695 return 0;
696 }
697
698 static const struct mfd_cell asic3_cell_ds1wm = {
699 .name = "ds1wm",
700 .enable = ds1wm_enable,
701 .disable = ds1wm_disable,
702 .platform_data = &ds1wm_pdata,
703 .pdata_size = sizeof(ds1wm_pdata),
704 .num_resources = ARRAY_SIZE(ds1wm_resources),
705 .resources = ds1wm_resources,
706 };
707
asic3_mmc_pwr(struct platform_device * pdev,int state)708 static void asic3_mmc_pwr(struct platform_device *pdev, int state)
709 {
710 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
711
712 tmio_core_mmc_pwr(asic->tmio_cnf, 1 - asic->bus_shift, state);
713 }
714
asic3_mmc_clk_div(struct platform_device * pdev,int state)715 static void asic3_mmc_clk_div(struct platform_device *pdev, int state)
716 {
717 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
718
719 tmio_core_mmc_clk_div(asic->tmio_cnf, 1 - asic->bus_shift, state);
720 }
721
722 static struct tmio_mmc_data asic3_mmc_data = {
723 .hclk = 24576000,
724 .set_pwr = asic3_mmc_pwr,
725 .set_clk_div = asic3_mmc_clk_div,
726 };
727
728 static struct resource asic3_mmc_resources[] = {
729 {
730 .start = ASIC3_SD_CTRL_BASE,
731 .end = ASIC3_SD_CTRL_BASE + 0x3ff,
732 .flags = IORESOURCE_MEM,
733 },
734 {
735 .start = 0,
736 .end = 0,
737 .flags = IORESOURCE_IRQ,
738 },
739 };
740
asic3_mmc_enable(struct platform_device * pdev)741 static int asic3_mmc_enable(struct platform_device *pdev)
742 {
743 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
744
745 /* Not sure if it must be done bit by bit, but leaving as-is */
746 asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
747 ASIC3_SDHWCTRL_LEVCD, 1);
748 asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
749 ASIC3_SDHWCTRL_LEVWP, 1);
750 asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
751 ASIC3_SDHWCTRL_SUSPEND, 0);
752 asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
753 ASIC3_SDHWCTRL_PCLR, 0);
754
755 asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_EX0]);
756 /* CLK32 used for card detection and for interruption detection
757 * when HCLK is stopped.
758 */
759 asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_EX1]);
760 msleep(1);
761
762 /* HCLK 24.576 MHz, BCLK 12.288 MHz: */
763 asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL),
764 CLOCK_SEL_CX | CLOCK_SEL_SD_HCLK_SEL);
765
766 asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_SD_HOST]);
767 asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_SD_BUS]);
768 msleep(1);
769
770 asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
771 ASIC3_EXTCF_SD_MEM_ENABLE, 1);
772
773 /* Enable SD card slot 3.3V power supply */
774 asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
775 ASIC3_SDHWCTRL_SDPWR, 1);
776
777 /* ASIC3_SD_CTRL_BASE assumes 32-bit addressing, TMIO is 16-bit */
778 tmio_core_mmc_enable(asic->tmio_cnf, 1 - asic->bus_shift,
779 ASIC3_SD_CTRL_BASE >> 1);
780
781 return 0;
782 }
783
asic3_mmc_disable(struct platform_device * pdev)784 static int asic3_mmc_disable(struct platform_device *pdev)
785 {
786 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
787
788 /* Put in suspend mode */
789 asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
790 ASIC3_SDHWCTRL_SUSPEND, 1);
791
792 /* Disable clocks */
793 asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_SD_HOST]);
794 asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_SD_BUS]);
795 asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_EX0]);
796 asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_EX1]);
797 return 0;
798 }
799
800 static const struct mfd_cell asic3_cell_mmc = {
801 .name = "tmio-mmc",
802 .enable = asic3_mmc_enable,
803 .disable = asic3_mmc_disable,
804 .suspend = asic3_mmc_disable,
805 .resume = asic3_mmc_enable,
806 .platform_data = &asic3_mmc_data,
807 .pdata_size = sizeof(asic3_mmc_data),
808 .num_resources = ARRAY_SIZE(asic3_mmc_resources),
809 .resources = asic3_mmc_resources,
810 };
811
812 static const int clock_ledn[ASIC3_NUM_LEDS] = {
813 [0] = ASIC3_CLOCK_LED0,
814 [1] = ASIC3_CLOCK_LED1,
815 [2] = ASIC3_CLOCK_LED2,
816 };
817
asic3_leds_enable(struct platform_device * pdev)818 static int asic3_leds_enable(struct platform_device *pdev)
819 {
820 const struct mfd_cell *cell = mfd_get_cell(pdev);
821 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
822
823 asic3_clk_enable(asic, &asic->clocks[clock_ledn[cell->id]]);
824
825 return 0;
826 }
827
asic3_leds_disable(struct platform_device * pdev)828 static int asic3_leds_disable(struct platform_device *pdev)
829 {
830 const struct mfd_cell *cell = mfd_get_cell(pdev);
831 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
832
833 asic3_clk_disable(asic, &asic->clocks[clock_ledn[cell->id]]);
834
835 return 0;
836 }
837
asic3_leds_suspend(struct platform_device * pdev)838 static int asic3_leds_suspend(struct platform_device *pdev)
839 {
840 const struct mfd_cell *cell = mfd_get_cell(pdev);
841 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
842
843 while (asic3_gpio_get(&asic->gpio, ASIC3_GPIO(C, cell->id)) != 0)
844 msleep(1);
845
846 asic3_clk_disable(asic, &asic->clocks[clock_ledn[cell->id]]);
847
848 return 0;
849 }
850
851 static struct mfd_cell asic3_cell_leds[ASIC3_NUM_LEDS] = {
852 [0] = {
853 .name = "leds-asic3",
854 .id = 0,
855 .enable = asic3_leds_enable,
856 .disable = asic3_leds_disable,
857 .suspend = asic3_leds_suspend,
858 .resume = asic3_leds_enable,
859 },
860 [1] = {
861 .name = "leds-asic3",
862 .id = 1,
863 .enable = asic3_leds_enable,
864 .disable = asic3_leds_disable,
865 .suspend = asic3_leds_suspend,
866 .resume = asic3_leds_enable,
867 },
868 [2] = {
869 .name = "leds-asic3",
870 .id = 2,
871 .enable = asic3_leds_enable,
872 .disable = asic3_leds_disable,
873 .suspend = asic3_leds_suspend,
874 .resume = asic3_leds_enable,
875 },
876 };
877
asic3_mfd_probe(struct platform_device * pdev,struct asic3_platform_data * pdata,struct resource * mem)878 static int __init asic3_mfd_probe(struct platform_device *pdev,
879 struct asic3_platform_data *pdata,
880 struct resource *mem)
881 {
882 struct asic3 *asic = platform_get_drvdata(pdev);
883 struct resource *mem_sdio;
884 int irq, ret;
885
886 mem_sdio = platform_get_resource(pdev, IORESOURCE_MEM, 1);
887 if (!mem_sdio)
888 dev_dbg(asic->dev, "no SDIO MEM resource\n");
889
890 irq = platform_get_irq(pdev, 1);
891 if (irq < 0)
892 dev_dbg(asic->dev, "no SDIO IRQ resource\n");
893
894 /* DS1WM */
895 asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
896 ASIC3_EXTCF_OWM_SMB, 0);
897
898 ds1wm_resources[0].start >>= asic->bus_shift;
899 ds1wm_resources[0].end >>= asic->bus_shift;
900
901 /* MMC */
902 if (mem_sdio) {
903 asic->tmio_cnf = ioremap((ASIC3_SD_CONFIG_BASE >> asic->bus_shift) +
904 mem_sdio->start,
905 ASIC3_SD_CONFIG_SIZE >> asic->bus_shift);
906 if (!asic->tmio_cnf) {
907 ret = -ENOMEM;
908 dev_dbg(asic->dev, "Couldn't ioremap SD_CONFIG\n");
909 goto out;
910 }
911 }
912 asic3_mmc_resources[0].start >>= asic->bus_shift;
913 asic3_mmc_resources[0].end >>= asic->bus_shift;
914
915 if (pdata->clock_rate) {
916 ds1wm_pdata.clock_rate = pdata->clock_rate;
917 ret = mfd_add_devices(&pdev->dev, pdev->id,
918 &asic3_cell_ds1wm, 1, mem, asic->irq_base, NULL);
919 if (ret < 0)
920 goto out;
921 }
922
923 if (mem_sdio && (irq >= 0)) {
924 ret = mfd_add_devices(&pdev->dev, pdev->id,
925 &asic3_cell_mmc, 1, mem_sdio, irq, NULL);
926 if (ret < 0)
927 goto out;
928 }
929
930 ret = 0;
931 if (pdata->leds) {
932 int i;
933
934 for (i = 0; i < ASIC3_NUM_LEDS; ++i) {
935 asic3_cell_leds[i].platform_data = &pdata->leds[i];
936 asic3_cell_leds[i].pdata_size = sizeof(pdata->leds[i]);
937 }
938 ret = mfd_add_devices(&pdev->dev, 0,
939 asic3_cell_leds, ASIC3_NUM_LEDS, NULL, 0, NULL);
940 }
941
942 out:
943 return ret;
944 }
945
asic3_mfd_remove(struct platform_device * pdev)946 static void asic3_mfd_remove(struct platform_device *pdev)
947 {
948 struct asic3 *asic = platform_get_drvdata(pdev);
949
950 mfd_remove_devices(&pdev->dev);
951 iounmap(asic->tmio_cnf);
952 }
953
954 /* Core */
asic3_probe(struct platform_device * pdev)955 static int __init asic3_probe(struct platform_device *pdev)
956 {
957 struct asic3_platform_data *pdata = dev_get_platdata(&pdev->dev);
958 struct asic3 *asic;
959 struct resource *mem;
960 unsigned long clksel;
961 int ret = 0;
962
963 asic = devm_kzalloc(&pdev->dev,
964 sizeof(struct asic3), GFP_KERNEL);
965 if (asic == NULL) {
966 printk(KERN_ERR "kzalloc failed\n");
967 return -ENOMEM;
968 }
969
970 spin_lock_init(&asic->lock);
971 platform_set_drvdata(pdev, asic);
972 asic->dev = &pdev->dev;
973
974 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
975 if (!mem) {
976 dev_err(asic->dev, "no MEM resource\n");
977 return -ENOMEM;
978 }
979
980 asic->mapping = ioremap(mem->start, resource_size(mem));
981 if (!asic->mapping) {
982 dev_err(asic->dev, "Couldn't ioremap\n");
983 return -ENOMEM;
984 }
985
986 asic->irq_base = pdata->irq_base;
987
988 /* calculate bus shift from mem resource */
989 asic->bus_shift = 2 - (resource_size(mem) >> 12);
990
991 clksel = 0;
992 asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), clksel);
993
994 ret = asic3_irq_probe(pdev);
995 if (ret < 0) {
996 dev_err(asic->dev, "Couldn't probe IRQs\n");
997 goto out_unmap;
998 }
999
1000 asic->gpio.label = "asic3";
1001 asic->gpio.base = pdata->gpio_base;
1002 asic->gpio.ngpio = ASIC3_NUM_GPIOS;
1003 asic->gpio.get = asic3_gpio_get;
1004 asic->gpio.set = asic3_gpio_set;
1005 asic->gpio.direction_input = asic3_gpio_direction_input;
1006 asic->gpio.direction_output = asic3_gpio_direction_output;
1007 asic->gpio.to_irq = asic3_gpio_to_irq;
1008
1009 ret = asic3_gpio_probe(pdev,
1010 pdata->gpio_config,
1011 pdata->gpio_config_num);
1012 if (ret < 0) {
1013 dev_err(asic->dev, "GPIO probe failed\n");
1014 goto out_irq;
1015 }
1016
1017 /* Making a per-device copy is only needed for the
1018 * theoretical case of multiple ASIC3s on one board:
1019 */
1020 memcpy(asic->clocks, asic3_clk_init, sizeof(asic3_clk_init));
1021
1022 asic3_mfd_probe(pdev, pdata, mem);
1023
1024 asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
1025 (ASIC3_EXTCF_CF0_BUF_EN|ASIC3_EXTCF_CF0_PWAIT_EN), 1);
1026
1027 dev_info(asic->dev, "ASIC3 Core driver\n");
1028
1029 return 0;
1030
1031 out_irq:
1032 asic3_irq_remove(pdev);
1033
1034 out_unmap:
1035 iounmap(asic->mapping);
1036
1037 return ret;
1038 }
1039
asic3_remove(struct platform_device * pdev)1040 static int asic3_remove(struct platform_device *pdev)
1041 {
1042 int ret;
1043 struct asic3 *asic = platform_get_drvdata(pdev);
1044
1045 asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
1046 (ASIC3_EXTCF_CF0_BUF_EN|ASIC3_EXTCF_CF0_PWAIT_EN), 0);
1047
1048 asic3_mfd_remove(pdev);
1049
1050 ret = asic3_gpio_remove(pdev);
1051 if (ret < 0)
1052 return ret;
1053 asic3_irq_remove(pdev);
1054
1055 asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), 0);
1056
1057 iounmap(asic->mapping);
1058
1059 return 0;
1060 }
1061
asic3_shutdown(struct platform_device * pdev)1062 static void asic3_shutdown(struct platform_device *pdev)
1063 {
1064 }
1065
1066 static struct platform_driver asic3_device_driver = {
1067 .driver = {
1068 .name = "asic3",
1069 },
1070 .remove = asic3_remove,
1071 .shutdown = asic3_shutdown,
1072 };
1073
asic3_init(void)1074 static int __init asic3_init(void)
1075 {
1076 int retval = 0;
1077 retval = platform_driver_probe(&asic3_device_driver, asic3_probe);
1078 return retval;
1079 }
1080
1081 subsys_initcall(asic3_init);
1082