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(unsigned int irq,struct irq_desc * desc)141 static void asic3_irq_demux(unsigned int irq, 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 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
415 }
416
417 asic3_write_register(asic, ASIC3_OFFSET(INTR, INT_MASK),
418 ASIC3_INTMASK_GINTMASK);
419
420 irq_set_chained_handler(asic->irq_nr, asic3_irq_demux);
421 irq_set_irq_type(asic->irq_nr, IRQ_TYPE_EDGE_RISING);
422 irq_set_handler_data(asic->irq_nr, asic);
423
424 return 0;
425 }
426
asic3_irq_remove(struct platform_device * pdev)427 static void asic3_irq_remove(struct platform_device *pdev)
428 {
429 struct asic3 *asic = platform_get_drvdata(pdev);
430 unsigned int irq, irq_base;
431
432 irq_base = asic->irq_base;
433
434 for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) {
435 set_irq_flags(irq, 0);
436 irq_set_chip_and_handler(irq, NULL, NULL);
437 irq_set_chip_data(irq, NULL);
438 }
439 irq_set_chained_handler(asic->irq_nr, NULL);
440 }
441
442 /* GPIOs */
asic3_gpio_direction(struct gpio_chip * chip,unsigned offset,int out)443 static int asic3_gpio_direction(struct gpio_chip *chip,
444 unsigned offset, int out)
445 {
446 u32 mask = ASIC3_GPIO_TO_MASK(offset), out_reg;
447 unsigned int gpio_base;
448 unsigned long flags;
449 struct asic3 *asic;
450
451 asic = container_of(chip, struct asic3, gpio);
452 gpio_base = ASIC3_GPIO_TO_BASE(offset);
453
454 if (gpio_base > ASIC3_GPIO_D_BASE) {
455 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
456 gpio_base, offset);
457 return -EINVAL;
458 }
459
460 spin_lock_irqsave(&asic->lock, flags);
461
462 out_reg = asic3_read_register(asic, gpio_base + ASIC3_GPIO_DIRECTION);
463
464 /* Input is 0, Output is 1 */
465 if (out)
466 out_reg |= mask;
467 else
468 out_reg &= ~mask;
469
470 asic3_write_register(asic, gpio_base + ASIC3_GPIO_DIRECTION, out_reg);
471
472 spin_unlock_irqrestore(&asic->lock, flags);
473
474 return 0;
475
476 }
477
asic3_gpio_direction_input(struct gpio_chip * chip,unsigned offset)478 static int asic3_gpio_direction_input(struct gpio_chip *chip,
479 unsigned offset)
480 {
481 return asic3_gpio_direction(chip, offset, 0);
482 }
483
asic3_gpio_direction_output(struct gpio_chip * chip,unsigned offset,int value)484 static int asic3_gpio_direction_output(struct gpio_chip *chip,
485 unsigned offset, int value)
486 {
487 return asic3_gpio_direction(chip, offset, 1);
488 }
489
asic3_gpio_get(struct gpio_chip * chip,unsigned offset)490 static int asic3_gpio_get(struct gpio_chip *chip,
491 unsigned offset)
492 {
493 unsigned int gpio_base;
494 u32 mask = ASIC3_GPIO_TO_MASK(offset);
495 struct asic3 *asic;
496
497 asic = container_of(chip, struct asic3, gpio);
498 gpio_base = ASIC3_GPIO_TO_BASE(offset);
499
500 if (gpio_base > ASIC3_GPIO_D_BASE) {
501 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
502 gpio_base, offset);
503 return -EINVAL;
504 }
505
506 return asic3_read_register(asic, gpio_base + ASIC3_GPIO_STATUS) & mask;
507 }
508
asic3_gpio_set(struct gpio_chip * chip,unsigned offset,int value)509 static void asic3_gpio_set(struct gpio_chip *chip,
510 unsigned offset, int value)
511 {
512 u32 mask, out_reg;
513 unsigned int gpio_base;
514 unsigned long flags;
515 struct asic3 *asic;
516
517 asic = container_of(chip, struct asic3, gpio);
518 gpio_base = ASIC3_GPIO_TO_BASE(offset);
519
520 if (gpio_base > ASIC3_GPIO_D_BASE) {
521 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
522 gpio_base, offset);
523 return;
524 }
525
526 mask = ASIC3_GPIO_TO_MASK(offset);
527
528 spin_lock_irqsave(&asic->lock, flags);
529
530 out_reg = asic3_read_register(asic, gpio_base + ASIC3_GPIO_OUT);
531
532 if (value)
533 out_reg |= mask;
534 else
535 out_reg &= ~mask;
536
537 asic3_write_register(asic, gpio_base + ASIC3_GPIO_OUT, out_reg);
538
539 spin_unlock_irqrestore(&asic->lock, flags);
540
541 return;
542 }
543
asic3_gpio_to_irq(struct gpio_chip * chip,unsigned offset)544 static int asic3_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
545 {
546 struct asic3 *asic = container_of(chip, struct asic3, gpio);
547
548 return asic->irq_base + offset;
549 }
550
asic3_gpio_probe(struct platform_device * pdev,u16 * gpio_config,int num)551 static __init int asic3_gpio_probe(struct platform_device *pdev,
552 u16 *gpio_config, int num)
553 {
554 struct asic3 *asic = platform_get_drvdata(pdev);
555 u16 alt_reg[ASIC3_NUM_GPIO_BANKS];
556 u16 out_reg[ASIC3_NUM_GPIO_BANKS];
557 u16 dir_reg[ASIC3_NUM_GPIO_BANKS];
558 int i;
559
560 memset(alt_reg, 0, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
561 memset(out_reg, 0, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
562 memset(dir_reg, 0, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
563
564 /* Enable all GPIOs */
565 asic3_write_register(asic, ASIC3_GPIO_OFFSET(A, MASK), 0xffff);
566 asic3_write_register(asic, ASIC3_GPIO_OFFSET(B, MASK), 0xffff);
567 asic3_write_register(asic, ASIC3_GPIO_OFFSET(C, MASK), 0xffff);
568 asic3_write_register(asic, ASIC3_GPIO_OFFSET(D, MASK), 0xffff);
569
570 for (i = 0; i < num; i++) {
571 u8 alt, pin, dir, init, bank_num, bit_num;
572 u16 config = gpio_config[i];
573
574 pin = ASIC3_CONFIG_GPIO_PIN(config);
575 alt = ASIC3_CONFIG_GPIO_ALT(config);
576 dir = ASIC3_CONFIG_GPIO_DIR(config);
577 init = ASIC3_CONFIG_GPIO_INIT(config);
578
579 bank_num = ASIC3_GPIO_TO_BANK(pin);
580 bit_num = ASIC3_GPIO_TO_BIT(pin);
581
582 alt_reg[bank_num] |= (alt << bit_num);
583 out_reg[bank_num] |= (init << bit_num);
584 dir_reg[bank_num] |= (dir << bit_num);
585 }
586
587 for (i = 0; i < ASIC3_NUM_GPIO_BANKS; i++) {
588 asic3_write_register(asic,
589 ASIC3_BANK_TO_BASE(i) +
590 ASIC3_GPIO_DIRECTION,
591 dir_reg[i]);
592 asic3_write_register(asic,
593 ASIC3_BANK_TO_BASE(i) + ASIC3_GPIO_OUT,
594 out_reg[i]);
595 asic3_write_register(asic,
596 ASIC3_BANK_TO_BASE(i) +
597 ASIC3_GPIO_ALT_FUNCTION,
598 alt_reg[i]);
599 }
600
601 return gpiochip_add(&asic->gpio);
602 }
603
asic3_gpio_remove(struct platform_device * pdev)604 static int asic3_gpio_remove(struct platform_device *pdev)
605 {
606 struct asic3 *asic = platform_get_drvdata(pdev);
607
608 gpiochip_remove(&asic->gpio);
609 return 0;
610 }
611
asic3_clk_enable(struct asic3 * asic,struct asic3_clk * clk)612 static void asic3_clk_enable(struct asic3 *asic, struct asic3_clk *clk)
613 {
614 unsigned long flags;
615 u32 cdex;
616
617 spin_lock_irqsave(&asic->lock, flags);
618 if (clk->enabled++ == 0) {
619 cdex = asic3_read_register(asic, ASIC3_OFFSET(CLOCK, CDEX));
620 cdex |= clk->cdex;
621 asic3_write_register(asic, ASIC3_OFFSET(CLOCK, CDEX), cdex);
622 }
623 spin_unlock_irqrestore(&asic->lock, flags);
624 }
625
asic3_clk_disable(struct asic3 * asic,struct asic3_clk * clk)626 static void asic3_clk_disable(struct asic3 *asic, struct asic3_clk *clk)
627 {
628 unsigned long flags;
629 u32 cdex;
630
631 WARN_ON(clk->enabled == 0);
632
633 spin_lock_irqsave(&asic->lock, flags);
634 if (--clk->enabled == 0) {
635 cdex = asic3_read_register(asic, ASIC3_OFFSET(CLOCK, CDEX));
636 cdex &= ~clk->cdex;
637 asic3_write_register(asic, ASIC3_OFFSET(CLOCK, CDEX), cdex);
638 }
639 spin_unlock_irqrestore(&asic->lock, flags);
640 }
641
642 /* MFD cells (SPI, PWM, LED, DS1WM, MMC) */
643 static struct ds1wm_driver_data ds1wm_pdata = {
644 .active_high = 1,
645 .reset_recover_delay = 1,
646 };
647
648 static struct resource ds1wm_resources[] = {
649 {
650 .start = ASIC3_OWM_BASE,
651 .end = ASIC3_OWM_BASE + 0x13,
652 .flags = IORESOURCE_MEM,
653 },
654 {
655 .start = ASIC3_IRQ_OWM,
656 .end = ASIC3_IRQ_OWM,
657 .flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE,
658 },
659 };
660
ds1wm_enable(struct platform_device * pdev)661 static int ds1wm_enable(struct platform_device *pdev)
662 {
663 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
664
665 /* Turn on external clocks and the OWM clock */
666 asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_EX0]);
667 asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_EX1]);
668 asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_OWM]);
669 msleep(1);
670
671 /* Reset and enable DS1WM */
672 asic3_set_register(asic, ASIC3_OFFSET(EXTCF, RESET),
673 ASIC3_EXTCF_OWM_RESET, 1);
674 msleep(1);
675 asic3_set_register(asic, ASIC3_OFFSET(EXTCF, RESET),
676 ASIC3_EXTCF_OWM_RESET, 0);
677 msleep(1);
678 asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
679 ASIC3_EXTCF_OWM_EN, 1);
680 msleep(1);
681
682 return 0;
683 }
684
ds1wm_disable(struct platform_device * pdev)685 static int ds1wm_disable(struct platform_device *pdev)
686 {
687 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
688
689 asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
690 ASIC3_EXTCF_OWM_EN, 0);
691
692 asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_OWM]);
693 asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_EX0]);
694 asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_EX1]);
695
696 return 0;
697 }
698
699 static const struct mfd_cell asic3_cell_ds1wm = {
700 .name = "ds1wm",
701 .enable = ds1wm_enable,
702 .disable = ds1wm_disable,
703 .platform_data = &ds1wm_pdata,
704 .pdata_size = sizeof(ds1wm_pdata),
705 .num_resources = ARRAY_SIZE(ds1wm_resources),
706 .resources = ds1wm_resources,
707 };
708
asic3_mmc_pwr(struct platform_device * pdev,int state)709 static void asic3_mmc_pwr(struct platform_device *pdev, int state)
710 {
711 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
712
713 tmio_core_mmc_pwr(asic->tmio_cnf, 1 - asic->bus_shift, state);
714 }
715
asic3_mmc_clk_div(struct platform_device * pdev,int state)716 static void asic3_mmc_clk_div(struct platform_device *pdev, int state)
717 {
718 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
719
720 tmio_core_mmc_clk_div(asic->tmio_cnf, 1 - asic->bus_shift, state);
721 }
722
723 static struct tmio_mmc_data asic3_mmc_data = {
724 .hclk = 24576000,
725 .set_pwr = asic3_mmc_pwr,
726 .set_clk_div = asic3_mmc_clk_div,
727 };
728
729 static struct resource asic3_mmc_resources[] = {
730 {
731 .start = ASIC3_SD_CTRL_BASE,
732 .end = ASIC3_SD_CTRL_BASE + 0x3ff,
733 .flags = IORESOURCE_MEM,
734 },
735 {
736 .start = 0,
737 .end = 0,
738 .flags = IORESOURCE_IRQ,
739 },
740 };
741
asic3_mmc_enable(struct platform_device * pdev)742 static int asic3_mmc_enable(struct platform_device *pdev)
743 {
744 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
745
746 /* Not sure if it must be done bit by bit, but leaving as-is */
747 asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
748 ASIC3_SDHWCTRL_LEVCD, 1);
749 asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
750 ASIC3_SDHWCTRL_LEVWP, 1);
751 asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
752 ASIC3_SDHWCTRL_SUSPEND, 0);
753 asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
754 ASIC3_SDHWCTRL_PCLR, 0);
755
756 asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_EX0]);
757 /* CLK32 used for card detection and for interruption detection
758 * when HCLK is stopped.
759 */
760 asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_EX1]);
761 msleep(1);
762
763 /* HCLK 24.576 MHz, BCLK 12.288 MHz: */
764 asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL),
765 CLOCK_SEL_CX | CLOCK_SEL_SD_HCLK_SEL);
766
767 asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_SD_HOST]);
768 asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_SD_BUS]);
769 msleep(1);
770
771 asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
772 ASIC3_EXTCF_SD_MEM_ENABLE, 1);
773
774 /* Enable SD card slot 3.3V power supply */
775 asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
776 ASIC3_SDHWCTRL_SDPWR, 1);
777
778 /* ASIC3_SD_CTRL_BASE assumes 32-bit addressing, TMIO is 16-bit */
779 tmio_core_mmc_enable(asic->tmio_cnf, 1 - asic->bus_shift,
780 ASIC3_SD_CTRL_BASE >> 1);
781
782 return 0;
783 }
784
asic3_mmc_disable(struct platform_device * pdev)785 static int asic3_mmc_disable(struct platform_device *pdev)
786 {
787 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
788
789 /* Put in suspend mode */
790 asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
791 ASIC3_SDHWCTRL_SUSPEND, 1);
792
793 /* Disable clocks */
794 asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_SD_HOST]);
795 asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_SD_BUS]);
796 asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_EX0]);
797 asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_EX1]);
798 return 0;
799 }
800
801 static const struct mfd_cell asic3_cell_mmc = {
802 .name = "tmio-mmc",
803 .enable = asic3_mmc_enable,
804 .disable = asic3_mmc_disable,
805 .suspend = asic3_mmc_disable,
806 .resume = asic3_mmc_enable,
807 .platform_data = &asic3_mmc_data,
808 .pdata_size = sizeof(asic3_mmc_data),
809 .num_resources = ARRAY_SIZE(asic3_mmc_resources),
810 .resources = asic3_mmc_resources,
811 };
812
813 static const int clock_ledn[ASIC3_NUM_LEDS] = {
814 [0] = ASIC3_CLOCK_LED0,
815 [1] = ASIC3_CLOCK_LED1,
816 [2] = ASIC3_CLOCK_LED2,
817 };
818
asic3_leds_enable(struct platform_device * pdev)819 static int asic3_leds_enable(struct platform_device *pdev)
820 {
821 const struct mfd_cell *cell = mfd_get_cell(pdev);
822 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
823
824 asic3_clk_enable(asic, &asic->clocks[clock_ledn[cell->id]]);
825
826 return 0;
827 }
828
asic3_leds_disable(struct platform_device * pdev)829 static int asic3_leds_disable(struct platform_device *pdev)
830 {
831 const struct mfd_cell *cell = mfd_get_cell(pdev);
832 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
833
834 asic3_clk_disable(asic, &asic->clocks[clock_ledn[cell->id]]);
835
836 return 0;
837 }
838
asic3_leds_suspend(struct platform_device * pdev)839 static int asic3_leds_suspend(struct platform_device *pdev)
840 {
841 const struct mfd_cell *cell = mfd_get_cell(pdev);
842 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
843
844 while (asic3_gpio_get(&asic->gpio, ASIC3_GPIO(C, cell->id)) != 0)
845 msleep(1);
846
847 asic3_clk_disable(asic, &asic->clocks[clock_ledn[cell->id]]);
848
849 return 0;
850 }
851
852 static struct mfd_cell asic3_cell_leds[ASIC3_NUM_LEDS] = {
853 [0] = {
854 .name = "leds-asic3",
855 .id = 0,
856 .enable = asic3_leds_enable,
857 .disable = asic3_leds_disable,
858 .suspend = asic3_leds_suspend,
859 .resume = asic3_leds_enable,
860 },
861 [1] = {
862 .name = "leds-asic3",
863 .id = 1,
864 .enable = asic3_leds_enable,
865 .disable = asic3_leds_disable,
866 .suspend = asic3_leds_suspend,
867 .resume = asic3_leds_enable,
868 },
869 [2] = {
870 .name = "leds-asic3",
871 .id = 2,
872 .enable = asic3_leds_enable,
873 .disable = asic3_leds_disable,
874 .suspend = asic3_leds_suspend,
875 .resume = asic3_leds_enable,
876 },
877 };
878
asic3_mfd_probe(struct platform_device * pdev,struct asic3_platform_data * pdata,struct resource * mem)879 static int __init asic3_mfd_probe(struct platform_device *pdev,
880 struct asic3_platform_data *pdata,
881 struct resource *mem)
882 {
883 struct asic3 *asic = platform_get_drvdata(pdev);
884 struct resource *mem_sdio;
885 int irq, ret;
886
887 mem_sdio = platform_get_resource(pdev, IORESOURCE_MEM, 1);
888 if (!mem_sdio)
889 dev_dbg(asic->dev, "no SDIO MEM resource\n");
890
891 irq = platform_get_irq(pdev, 1);
892 if (irq < 0)
893 dev_dbg(asic->dev, "no SDIO IRQ resource\n");
894
895 /* DS1WM */
896 asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
897 ASIC3_EXTCF_OWM_SMB, 0);
898
899 ds1wm_resources[0].start >>= asic->bus_shift;
900 ds1wm_resources[0].end >>= asic->bus_shift;
901
902 /* MMC */
903 if (mem_sdio) {
904 asic->tmio_cnf = ioremap((ASIC3_SD_CONFIG_BASE >> asic->bus_shift) +
905 mem_sdio->start,
906 ASIC3_SD_CONFIG_SIZE >> asic->bus_shift);
907 if (!asic->tmio_cnf) {
908 ret = -ENOMEM;
909 dev_dbg(asic->dev, "Couldn't ioremap SD_CONFIG\n");
910 goto out;
911 }
912 }
913 asic3_mmc_resources[0].start >>= asic->bus_shift;
914 asic3_mmc_resources[0].end >>= asic->bus_shift;
915
916 if (pdata->clock_rate) {
917 ds1wm_pdata.clock_rate = pdata->clock_rate;
918 ret = mfd_add_devices(&pdev->dev, pdev->id,
919 &asic3_cell_ds1wm, 1, mem, asic->irq_base, NULL);
920 if (ret < 0)
921 goto out;
922 }
923
924 if (mem_sdio && (irq >= 0)) {
925 ret = mfd_add_devices(&pdev->dev, pdev->id,
926 &asic3_cell_mmc, 1, mem_sdio, irq, NULL);
927 if (ret < 0)
928 goto out;
929 }
930
931 ret = 0;
932 if (pdata->leds) {
933 int i;
934
935 for (i = 0; i < ASIC3_NUM_LEDS; ++i) {
936 asic3_cell_leds[i].platform_data = &pdata->leds[i];
937 asic3_cell_leds[i].pdata_size = sizeof(pdata->leds[i]);
938 }
939 ret = mfd_add_devices(&pdev->dev, 0,
940 asic3_cell_leds, ASIC3_NUM_LEDS, NULL, 0, NULL);
941 }
942
943 out:
944 return ret;
945 }
946
asic3_mfd_remove(struct platform_device * pdev)947 static void asic3_mfd_remove(struct platform_device *pdev)
948 {
949 struct asic3 *asic = platform_get_drvdata(pdev);
950
951 mfd_remove_devices(&pdev->dev);
952 iounmap(asic->tmio_cnf);
953 }
954
955 /* Core */
asic3_probe(struct platform_device * pdev)956 static int __init asic3_probe(struct platform_device *pdev)
957 {
958 struct asic3_platform_data *pdata = dev_get_platdata(&pdev->dev);
959 struct asic3 *asic;
960 struct resource *mem;
961 unsigned long clksel;
962 int ret = 0;
963
964 asic = devm_kzalloc(&pdev->dev,
965 sizeof(struct asic3), GFP_KERNEL);
966 if (asic == NULL) {
967 printk(KERN_ERR "kzalloc failed\n");
968 return -ENOMEM;
969 }
970
971 spin_lock_init(&asic->lock);
972 platform_set_drvdata(pdev, asic);
973 asic->dev = &pdev->dev;
974
975 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
976 if (!mem) {
977 dev_err(asic->dev, "no MEM resource\n");
978 return -ENOMEM;
979 }
980
981 asic->mapping = ioremap(mem->start, resource_size(mem));
982 if (!asic->mapping) {
983 dev_err(asic->dev, "Couldn't ioremap\n");
984 return -ENOMEM;
985 }
986
987 asic->irq_base = pdata->irq_base;
988
989 /* calculate bus shift from mem resource */
990 asic->bus_shift = 2 - (resource_size(mem) >> 12);
991
992 clksel = 0;
993 asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), clksel);
994
995 ret = asic3_irq_probe(pdev);
996 if (ret < 0) {
997 dev_err(asic->dev, "Couldn't probe IRQs\n");
998 goto out_unmap;
999 }
1000
1001 asic->gpio.label = "asic3";
1002 asic->gpio.base = pdata->gpio_base;
1003 asic->gpio.ngpio = ASIC3_NUM_GPIOS;
1004 asic->gpio.get = asic3_gpio_get;
1005 asic->gpio.set = asic3_gpio_set;
1006 asic->gpio.direction_input = asic3_gpio_direction_input;
1007 asic->gpio.direction_output = asic3_gpio_direction_output;
1008 asic->gpio.to_irq = asic3_gpio_to_irq;
1009
1010 ret = asic3_gpio_probe(pdev,
1011 pdata->gpio_config,
1012 pdata->gpio_config_num);
1013 if (ret < 0) {
1014 dev_err(asic->dev, "GPIO probe failed\n");
1015 goto out_irq;
1016 }
1017
1018 /* Making a per-device copy is only needed for the
1019 * theoretical case of multiple ASIC3s on one board:
1020 */
1021 memcpy(asic->clocks, asic3_clk_init, sizeof(asic3_clk_init));
1022
1023 asic3_mfd_probe(pdev, pdata, mem);
1024
1025 asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
1026 (ASIC3_EXTCF_CF0_BUF_EN|ASIC3_EXTCF_CF0_PWAIT_EN), 1);
1027
1028 dev_info(asic->dev, "ASIC3 Core driver\n");
1029
1030 return 0;
1031
1032 out_irq:
1033 asic3_irq_remove(pdev);
1034
1035 out_unmap:
1036 iounmap(asic->mapping);
1037
1038 return ret;
1039 }
1040
asic3_remove(struct platform_device * pdev)1041 static int asic3_remove(struct platform_device *pdev)
1042 {
1043 int ret;
1044 struct asic3 *asic = platform_get_drvdata(pdev);
1045
1046 asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
1047 (ASIC3_EXTCF_CF0_BUF_EN|ASIC3_EXTCF_CF0_PWAIT_EN), 0);
1048
1049 asic3_mfd_remove(pdev);
1050
1051 ret = asic3_gpio_remove(pdev);
1052 if (ret < 0)
1053 return ret;
1054 asic3_irq_remove(pdev);
1055
1056 asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), 0);
1057
1058 iounmap(asic->mapping);
1059
1060 return 0;
1061 }
1062
asic3_shutdown(struct platform_device * pdev)1063 static void asic3_shutdown(struct platform_device *pdev)
1064 {
1065 }
1066
1067 static struct platform_driver asic3_device_driver = {
1068 .driver = {
1069 .name = "asic3",
1070 },
1071 .remove = asic3_remove,
1072 .shutdown = asic3_shutdown,
1073 };
1074
asic3_init(void)1075 static int __init asic3_init(void)
1076 {
1077 int retval = 0;
1078 retval = platform_driver_probe(&asic3_device_driver, asic3_probe);
1079 return retval;
1080 }
1081
1082 subsys_initcall(asic3_init);
1083