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1/*
2 * Sonics Silicon Backplane
3 * Broadcom ChipCommon core driver
4 *
5 * Copyright 2005, Broadcom Corporation
6 * Copyright 2006, 2007, Michael Buesch <[email protected]>
7 * Copyright 2012, Hauke Mehrtens <[email protected]>
8 *
9 * Licensed under the GNU/GPL. See COPYING for details.
10 */
11
12#include "ssb_private.h"
13
14#include <linux/ssb/ssb.h>
15#include <linux/ssb/ssb_regs.h>
16#include <linux/export.h>
17#include <linux/pci.h>
18#include <linux/bcm47xx_wdt.h>
19
20
21/* Clock sources */
22enum ssb_clksrc {
23 /* PCI clock */
24 SSB_CHIPCO_CLKSRC_PCI,
25 /* Crystal slow clock oscillator */
26 SSB_CHIPCO_CLKSRC_XTALOS,
27 /* Low power oscillator */
28 SSB_CHIPCO_CLKSRC_LOPWROS,
29};
30
31
32static inline u32 chipco_write32_masked(struct ssb_chipcommon *cc, u16 offset,
33 u32 mask, u32 value)
34{
35 value &= mask;
36 value |= chipco_read32(cc, offset) & ~mask;
37 chipco_write32(cc, offset, value);
38
39 return value;
40}
41
42void ssb_chipco_set_clockmode(struct ssb_chipcommon *cc,
43 enum ssb_clkmode mode)
44{
45 struct ssb_device *ccdev = cc->dev;
46 struct ssb_bus *bus;
47 u32 tmp;
48
49 if (!ccdev)
50 return;
51 bus = ccdev->bus;
52
53 /* We support SLOW only on 6..9 */
54 if (ccdev->id.revision >= 10 && mode == SSB_CLKMODE_SLOW)
55 mode = SSB_CLKMODE_DYNAMIC;
56
57 if (cc->capabilities & SSB_CHIPCO_CAP_PMU)
58 return; /* PMU controls clockmode, separated function needed */
59 WARN_ON(ccdev->id.revision >= 20);
60
61 /* chipcommon cores prior to rev6 don't support dynamic clock control */
62 if (ccdev->id.revision < 6)
63 return;
64
65 /* ChipCommon cores rev10+ need testing */
66 if (ccdev->id.revision >= 10)
67 return;
68
69 if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
70 return;
71
72 switch (mode) {
73 case SSB_CLKMODE_SLOW: /* For revs 6..9 only */
74 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
75 tmp |= SSB_CHIPCO_SLOWCLKCTL_FSLOW;
76 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
77 break;
78 case SSB_CLKMODE_FAST:
79 if (ccdev->id.revision < 10) {
80 ssb_pci_xtal(bus, SSB_GPIO_XTAL, 1); /* Force crystal on */
81 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
82 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_FSLOW;
83 tmp |= SSB_CHIPCO_SLOWCLKCTL_IPLL;
84 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
85 } else {
86 chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL,
87 (chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) |
88 SSB_CHIPCO_SYSCLKCTL_FORCEHT));
89 /* udelay(150); TODO: not available in early init */
90 }
91 break;
92 case SSB_CLKMODE_DYNAMIC:
93 if (ccdev->id.revision < 10) {
94 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
95 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_FSLOW;
96 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_IPLL;
97 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_ENXTAL;
98 if ((tmp & SSB_CHIPCO_SLOWCLKCTL_SRC) !=
99 SSB_CHIPCO_SLOWCLKCTL_SRC_XTAL)
100 tmp |= SSB_CHIPCO_SLOWCLKCTL_ENXTAL;
101 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
102
103 /* For dynamic control, we have to release our xtal_pu
104 * "force on" */
105 if (tmp & SSB_CHIPCO_SLOWCLKCTL_ENXTAL)
106 ssb_pci_xtal(bus, SSB_GPIO_XTAL, 0);
107 } else {
108 chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL,
109 (chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) &
110 ~SSB_CHIPCO_SYSCLKCTL_FORCEHT));
111 }
112 break;
113 default:
114 WARN_ON(1);
115 }
116}
117
118/* Get the Slow Clock Source */
119static enum ssb_clksrc chipco_pctl_get_slowclksrc(struct ssb_chipcommon *cc)
120{
121 struct ssb_bus *bus = cc->dev->bus;
122 u32 tmp;
123
124 if (cc->dev->id.revision < 6) {
125 if (bus->bustype == SSB_BUSTYPE_SSB ||
126 bus->bustype == SSB_BUSTYPE_PCMCIA)
127 return SSB_CHIPCO_CLKSRC_XTALOS;
128 if (bus->bustype == SSB_BUSTYPE_PCI) {
129 pci_read_config_dword(bus->host_pci, SSB_GPIO_OUT, &tmp);
130 if (tmp & 0x10)
131 return SSB_CHIPCO_CLKSRC_PCI;
132 return SSB_CHIPCO_CLKSRC_XTALOS;
133 }
134 }
135 if (cc->dev->id.revision < 10) {
136 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
137 tmp &= 0x7;
138 if (tmp == 0)
139 return SSB_CHIPCO_CLKSRC_LOPWROS;
140 if (tmp == 1)
141 return SSB_CHIPCO_CLKSRC_XTALOS;
142 if (tmp == 2)
143 return SSB_CHIPCO_CLKSRC_PCI;
144 }
145
146 return SSB_CHIPCO_CLKSRC_XTALOS;
147}
148
149/* Get maximum or minimum (depending on get_max flag) slowclock frequency. */
150static int chipco_pctl_clockfreqlimit(struct ssb_chipcommon *cc, int get_max)
151{
152 int limit;
153 enum ssb_clksrc clocksrc;
154 int divisor = 1;
155 u32 tmp;
156
157 clocksrc = chipco_pctl_get_slowclksrc(cc);
158 if (cc->dev->id.revision < 6) {
159 switch (clocksrc) {
160 case SSB_CHIPCO_CLKSRC_PCI:
161 divisor = 64;
162 break;
163 case SSB_CHIPCO_CLKSRC_XTALOS:
164 divisor = 32;
165 break;
166 default:
167 WARN_ON(1);
168 }
169 } else if (cc->dev->id.revision < 10) {
170 switch (clocksrc) {
171 case SSB_CHIPCO_CLKSRC_LOPWROS:
172 break;
173 case SSB_CHIPCO_CLKSRC_XTALOS:
174 case SSB_CHIPCO_CLKSRC_PCI:
175 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
176 divisor = (tmp >> 16) + 1;
177 divisor *= 4;
178 break;
179 }
180 } else {
181 tmp = chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL);
182 divisor = (tmp >> 16) + 1;
183 divisor *= 4;
184 }
185
186 switch (clocksrc) {
187 case SSB_CHIPCO_CLKSRC_LOPWROS:
188 if (get_max)
189 limit = 43000;
190 else
191 limit = 25000;
192 break;
193 case SSB_CHIPCO_CLKSRC_XTALOS:
194 if (get_max)
195 limit = 20200000;
196 else
197 limit = 19800000;
198 break;
199 case SSB_CHIPCO_CLKSRC_PCI:
200 if (get_max)
201 limit = 34000000;
202 else
203 limit = 25000000;
204 break;
205 }
206 limit /= divisor;
207
208 return limit;
209}
210
211static void chipco_powercontrol_init(struct ssb_chipcommon *cc)
212{
213 struct ssb_bus *bus = cc->dev->bus;
214
215 if (bus->chip_id == 0x4321) {
216 if (bus->chip_rev == 0)
217 chipco_write32(cc, SSB_CHIPCO_CHIPCTL, 0x3A4);
218 else if (bus->chip_rev == 1)
219 chipco_write32(cc, SSB_CHIPCO_CHIPCTL, 0xA4);
220 }
221
222 if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
223 return;
224
225 if (cc->dev->id.revision >= 10) {
226 /* Set Idle Power clock rate to 1Mhz */
227 chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL,
228 (chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) &
229 0x0000FFFF) | 0x00040000);
230 } else {
231 int maxfreq;
232
233 maxfreq = chipco_pctl_clockfreqlimit(cc, 1);
234 chipco_write32(cc, SSB_CHIPCO_PLLONDELAY,
235 (maxfreq * 150 + 999999) / 1000000);
236 chipco_write32(cc, SSB_CHIPCO_FREFSELDELAY,
237 (maxfreq * 15 + 999999) / 1000000);
238 }
239}
240
241/* https://bcm-v4.sipsolutions.net/802.11/PmuFastPwrupDelay */
242static u16 pmu_fast_powerup_delay(struct ssb_chipcommon *cc)
243{
244 struct ssb_bus *bus = cc->dev->bus;
245
246 switch (bus->chip_id) {
247 case 0x4312:
248 case 0x4322:
249 case 0x4328:
250 return 7000;
251 case 0x4325:
252 /* TODO: */
253 default:
254 return 15000;
255 }
256}
257
258/* https://bcm-v4.sipsolutions.net/802.11/ClkctlFastPwrupDelay */
259static void calc_fast_powerup_delay(struct ssb_chipcommon *cc)
260{
261 struct ssb_bus *bus = cc->dev->bus;
262 int minfreq;
263 unsigned int tmp;
264 u32 pll_on_delay;
265
266 if (bus->bustype != SSB_BUSTYPE_PCI)
267 return;
268
269 if (cc->capabilities & SSB_CHIPCO_CAP_PMU) {
270 cc->fast_pwrup_delay = pmu_fast_powerup_delay(cc);
271 return;
272 }
273
274 if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
275 return;
276
277 minfreq = chipco_pctl_clockfreqlimit(cc, 0);
278 pll_on_delay = chipco_read32(cc, SSB_CHIPCO_PLLONDELAY);
279 tmp = (((pll_on_delay + 2) * 1000000) + (minfreq - 1)) / minfreq;
280 WARN_ON(tmp & ~0xFFFF);
281
282 cc->fast_pwrup_delay = tmp;
283}
284
285static u32 ssb_chipco_alp_clock(struct ssb_chipcommon *cc)
286{
287 if (cc->capabilities & SSB_CHIPCO_CAP_PMU)
288 return ssb_pmu_get_alp_clock(cc);
289
290 return 20000000;
291}
292
293static u32 ssb_chipco_watchdog_get_max_timer(struct ssb_chipcommon *cc)
294{
295 u32 nb;
296
297 if (cc->capabilities & SSB_CHIPCO_CAP_PMU) {
298 if (cc->dev->id.revision < 26)
299 nb = 16;
300 else
301 nb = (cc->dev->id.revision >= 37) ? 32 : 24;
302 } else {
303 nb = 28;
304 }
305 if (nb == 32)
306 return 0xffffffff;
307 else
308 return (1 << nb) - 1;
309}
310
311u32 ssb_chipco_watchdog_timer_set_wdt(struct bcm47xx_wdt *wdt, u32 ticks)
312{
313 struct ssb_chipcommon *cc = bcm47xx_wdt_get_drvdata(wdt);
314
315 if (cc->dev->bus->bustype != SSB_BUSTYPE_SSB)
316 return 0;
317
318 return ssb_chipco_watchdog_timer_set(cc, ticks);
319}
320
321u32 ssb_chipco_watchdog_timer_set_ms(struct bcm47xx_wdt *wdt, u32 ms)
322{
323 struct ssb_chipcommon *cc = bcm47xx_wdt_get_drvdata(wdt);
324 u32 ticks;
325
326 if (cc->dev->bus->bustype != SSB_BUSTYPE_SSB)
327 return 0;
328
329 ticks = ssb_chipco_watchdog_timer_set(cc, cc->ticks_per_ms * ms);
330 return ticks / cc->ticks_per_ms;
331}
332
333static int ssb_chipco_watchdog_ticks_per_ms(struct ssb_chipcommon *cc)
334{
335 struct ssb_bus *bus = cc->dev->bus;
336
337 if (cc->capabilities & SSB_CHIPCO_CAP_PMU) {
338 /* based on 32KHz ILP clock */
339 return 32;
340 } else {
341 if (cc->dev->id.revision < 18)
342 return ssb_clockspeed(bus) / 1000;
343 else
344 return ssb_chipco_alp_clock(cc) / 1000;
345 }
346}
347
348void ssb_chipcommon_init(struct ssb_chipcommon *cc)
349{
350 if (!cc->dev)
351 return; /* We don't have a ChipCommon */
352
353 spin_lock_init(&cc->gpio_lock);
354
355 if (cc->dev->id.revision >= 11)
356 cc->status = chipco_read32(cc, SSB_CHIPCO_CHIPSTAT);
357 dev_dbg(cc->dev->dev, "chipcommon status is 0x%x\n", cc->status);
358
359 if (cc->dev->id.revision >= 20) {
360 chipco_write32(cc, SSB_CHIPCO_GPIOPULLUP, 0);
361 chipco_write32(cc, SSB_CHIPCO_GPIOPULLDOWN, 0);
362 }
363
364 ssb_pmu_init(cc);
365 chipco_powercontrol_init(cc);
366 ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST);
367 calc_fast_powerup_delay(cc);
368
369 if (cc->dev->bus->bustype == SSB_BUSTYPE_SSB) {
370 cc->ticks_per_ms = ssb_chipco_watchdog_ticks_per_ms(cc);
371 cc->max_timer_ms = ssb_chipco_watchdog_get_max_timer(cc) / cc->ticks_per_ms;
372 }
373}
374
375void ssb_chipco_suspend(struct ssb_chipcommon *cc)
376{
377 if (!cc->dev)
378 return;
379 ssb_chipco_set_clockmode(cc, SSB_CLKMODE_SLOW);
380}
381
382void ssb_chipco_resume(struct ssb_chipcommon *cc)
383{
384 if (!cc->dev)
385 return;
386 chipco_powercontrol_init(cc);
387 ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST);
388}
389
390/* Get the processor clock */
391void ssb_chipco_get_clockcpu(struct ssb_chipcommon *cc,
392 u32 *plltype, u32 *n, u32 *m)
393{
394 *n = chipco_read32(cc, SSB_CHIPCO_CLOCK_N);
395 *plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
396 switch (*plltype) {
397 case SSB_PLLTYPE_2:
398 case SSB_PLLTYPE_4:
399 case SSB_PLLTYPE_6:
400 case SSB_PLLTYPE_7:
401 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_MIPS);
402 break;
403 case SSB_PLLTYPE_3:
404 /* 5350 uses m2 to control mips */
405 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_M2);
406 break;
407 default:
408 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_SB);
409 break;
410 }
411}
412
413/* Get the bus clock */
414void ssb_chipco_get_clockcontrol(struct ssb_chipcommon *cc,
415 u32 *plltype, u32 *n, u32 *m)
416{
417 *n = chipco_read32(cc, SSB_CHIPCO_CLOCK_N);
418 *plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
419 switch (*plltype) {
420 case SSB_PLLTYPE_6: /* 100/200 or 120/240 only */
421 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_MIPS);
422 break;
423 case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
424 if (cc->dev->bus->chip_id != 0x5365) {
425 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_M2);
426 break;
427 }
428 fallthrough;
429 default:
430 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_SB);
431 }
432}
433
434void ssb_chipco_timing_init(struct ssb_chipcommon *cc,
435 unsigned long ns)
436{
437 struct ssb_device *dev = cc->dev;
438 struct ssb_bus *bus = dev->bus;
439 u32 tmp;
440
441 /* set register for external IO to control LED. */
442 chipco_write32(cc, SSB_CHIPCO_PROG_CFG, 0x11);
443 tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT; /* Waitcount-3 = 10ns */
444 tmp |= DIV_ROUND_UP(40, ns) << SSB_PROG_WCNT_1_SHIFT; /* Waitcount-1 = 40ns */
445 tmp |= DIV_ROUND_UP(240, ns); /* Waitcount-0 = 240ns */
446 chipco_write32(cc, SSB_CHIPCO_PROG_WAITCNT, tmp); /* 0x01020a0c for a 100Mhz clock */
447
448 /* Set timing for the flash */
449 tmp = DIV_ROUND_UP(10, ns) << SSB_FLASH_WCNT_3_SHIFT; /* Waitcount-3 = 10nS */
450 tmp |= DIV_ROUND_UP(10, ns) << SSB_FLASH_WCNT_1_SHIFT; /* Waitcount-1 = 10nS */
451 tmp |= DIV_ROUND_UP(120, ns); /* Waitcount-0 = 120nS */
452 if ((bus->chip_id == 0x5365) ||
453 (dev->id.revision < 9))
454 chipco_write32(cc, SSB_CHIPCO_FLASH_WAITCNT, tmp);
455 if ((bus->chip_id == 0x5365) ||
456 (dev->id.revision < 9) ||
457 ((bus->chip_id == 0x5350) && (bus->chip_rev == 0)))
458 chipco_write32(cc, SSB_CHIPCO_PCMCIA_MEMWAIT, tmp);
459
460 if (bus->chip_id == 0x5350) {
461 /* Enable EXTIF */
462 tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT; /* Waitcount-3 = 10ns */
463 tmp |= DIV_ROUND_UP(20, ns) << SSB_PROG_WCNT_2_SHIFT; /* Waitcount-2 = 20ns */
464 tmp |= DIV_ROUND_UP(100, ns) << SSB_PROG_WCNT_1_SHIFT; /* Waitcount-1 = 100ns */
465 tmp |= DIV_ROUND_UP(120, ns); /* Waitcount-0 = 120ns */
466 chipco_write32(cc, SSB_CHIPCO_PROG_WAITCNT, tmp); /* 0x01020a0c for a 100Mhz clock */
467 }
468}
469
470/* Set chip watchdog reset timer to fire in 'ticks' backplane cycles */
471u32 ssb_chipco_watchdog_timer_set(struct ssb_chipcommon *cc, u32 ticks)
472{
473 u32 maxt;
474 enum ssb_clkmode clkmode;
475
476 maxt = ssb_chipco_watchdog_get_max_timer(cc);
477 if (cc->capabilities & SSB_CHIPCO_CAP_PMU) {
478 if (ticks == 1)
479 ticks = 2;
480 else if (ticks > maxt)
481 ticks = maxt;
482 chipco_write32(cc, SSB_CHIPCO_PMU_WATCHDOG, ticks);
483 } else {
484 clkmode = ticks ? SSB_CLKMODE_FAST : SSB_CLKMODE_DYNAMIC;
485 ssb_chipco_set_clockmode(cc, clkmode);
486 if (ticks > maxt)
487 ticks = maxt;
488 /* instant NMI */
489 chipco_write32(cc, SSB_CHIPCO_WATCHDOG, ticks);
490 }
491 return ticks;
492}
493
494void ssb_chipco_irq_mask(struct ssb_chipcommon *cc, u32 mask, u32 value)
495{
496 chipco_write32_masked(cc, SSB_CHIPCO_IRQMASK, mask, value);
497}
498
499u32 ssb_chipco_irq_status(struct ssb_chipcommon *cc, u32 mask)
500{
501 return chipco_read32(cc, SSB_CHIPCO_IRQSTAT) & mask;
502}
503
504u32 ssb_chipco_gpio_in(struct ssb_chipcommon *cc, u32 mask)
505{
506 return chipco_read32(cc, SSB_CHIPCO_GPIOIN) & mask;
507}
508
509u32 ssb_chipco_gpio_out(struct ssb_chipcommon *cc, u32 mask, u32 value)
510{
511 unsigned long flags;
512 u32 res = 0;
513
514 spin_lock_irqsave(&cc->gpio_lock, flags);
515 res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOOUT, mask, value);
516 spin_unlock_irqrestore(&cc->gpio_lock, flags);
517
518 return res;
519}
520
521u32 ssb_chipco_gpio_outen(struct ssb_chipcommon *cc, u32 mask, u32 value)
522{
523 unsigned long flags;
524 u32 res = 0;
525
526 spin_lock_irqsave(&cc->gpio_lock, flags);
527 res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOOUTEN, mask, value);
528 spin_unlock_irqrestore(&cc->gpio_lock, flags);
529
530 return res;
531}
532
533u32 ssb_chipco_gpio_control(struct ssb_chipcommon *cc, u32 mask, u32 value)
534{
535 unsigned long flags;
536 u32 res = 0;
537
538 spin_lock_irqsave(&cc->gpio_lock, flags);
539 res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOCTL, mask, value);
540 spin_unlock_irqrestore(&cc->gpio_lock, flags);
541
542 return res;
543}
544EXPORT_SYMBOL(ssb_chipco_gpio_control);
545
546u32 ssb_chipco_gpio_intmask(struct ssb_chipcommon *cc, u32 mask, u32 value)
547{
548 unsigned long flags;
549 u32 res = 0;
550
551 spin_lock_irqsave(&cc->gpio_lock, flags);
552 res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOIRQ, mask, value);
553 spin_unlock_irqrestore(&cc->gpio_lock, flags);
554
555 return res;
556}
557
558u32 ssb_chipco_gpio_polarity(struct ssb_chipcommon *cc, u32 mask, u32 value)
559{
560 unsigned long flags;
561 u32 res = 0;
562
563 spin_lock_irqsave(&cc->gpio_lock, flags);
564 res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOPOL, mask, value);
565 spin_unlock_irqrestore(&cc->gpio_lock, flags);
566
567 return res;
568}
569
570u32 ssb_chipco_gpio_pullup(struct ssb_chipcommon *cc, u32 mask, u32 value)
571{
572 unsigned long flags;
573 u32 res = 0;
574
575 if (cc->dev->id.revision < 20)
576 return 0xffffffff;
577
578 spin_lock_irqsave(&cc->gpio_lock, flags);
579 res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOPULLUP, mask, value);
580 spin_unlock_irqrestore(&cc->gpio_lock, flags);
581
582 return res;
583}
584
585u32 ssb_chipco_gpio_pulldown(struct ssb_chipcommon *cc, u32 mask, u32 value)
586{
587 unsigned long flags;
588 u32 res = 0;
589
590 if (cc->dev->id.revision < 20)
591 return 0xffffffff;
592
593 spin_lock_irqsave(&cc->gpio_lock, flags);
594 res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOPULLDOWN, mask, value);
595 spin_unlock_irqrestore(&cc->gpio_lock, flags);
596
597 return res;
598}
599
600#ifdef CONFIG_SSB_SERIAL
601int ssb_chipco_serial_init(struct ssb_chipcommon *cc,
602 struct ssb_serial_port *ports)
603{
604 struct ssb_bus *bus = cc->dev->bus;
605 int nr_ports = 0;
606 u32 plltype;
607 unsigned int irq;
608 u32 baud_base, div;
609 u32 i, n;
610 unsigned int ccrev = cc->dev->id.revision;
611
612 plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
613 irq = ssb_mips_irq(cc->dev);
614
615 if (plltype == SSB_PLLTYPE_1) {
616 /* PLL clock */
617 baud_base = ssb_calc_clock_rate(plltype,
618 chipco_read32(cc, SSB_CHIPCO_CLOCK_N),
619 chipco_read32(cc, SSB_CHIPCO_CLOCK_M2));
620 div = 1;
621 } else {
622 if (ccrev == 20) {
623 /* BCM5354 uses constant 25MHz clock */
624 baud_base = 25000000;
625 div = 48;
626 /* Set the override bit so we don't divide it */
627 chipco_write32(cc, SSB_CHIPCO_CORECTL,
628 chipco_read32(cc, SSB_CHIPCO_CORECTL)
629 | SSB_CHIPCO_CORECTL_UARTCLK0);
630 } else if ((ccrev >= 11) && (ccrev != 15)) {
631 baud_base = ssb_chipco_alp_clock(cc);
632 div = 1;
633 if (ccrev >= 21) {
634 /* Turn off UART clock before switching clocksource. */
635 chipco_write32(cc, SSB_CHIPCO_CORECTL,
636 chipco_read32(cc, SSB_CHIPCO_CORECTL)
637 & ~SSB_CHIPCO_CORECTL_UARTCLKEN);
638 }
639 /* Set the override bit so we don't divide it */
640 chipco_write32(cc, SSB_CHIPCO_CORECTL,
641 chipco_read32(cc, SSB_CHIPCO_CORECTL)
642 | SSB_CHIPCO_CORECTL_UARTCLK0);
643 if (ccrev >= 21) {
644 /* Re-enable the UART clock. */
645 chipco_write32(cc, SSB_CHIPCO_CORECTL,
646 chipco_read32(cc, SSB_CHIPCO_CORECTL)
647 | SSB_CHIPCO_CORECTL_UARTCLKEN);
648 }
649 } else if (ccrev >= 3) {
650 /* Internal backplane clock */
651 baud_base = ssb_clockspeed(bus);
652 div = chipco_read32(cc, SSB_CHIPCO_CLKDIV)
653 & SSB_CHIPCO_CLKDIV_UART;
654 } else {
655 /* Fixed internal backplane clock */
656 baud_base = 88000000;
657 div = 48;
658 }
659
660 /* Clock source depends on strapping if UartClkOverride is unset */
661 if ((ccrev > 0) &&
662 !(chipco_read32(cc, SSB_CHIPCO_CORECTL) & SSB_CHIPCO_CORECTL_UARTCLK0)) {
663 if ((cc->capabilities & SSB_CHIPCO_CAP_UARTCLK) ==
664 SSB_CHIPCO_CAP_UARTCLK_INT) {
665 /* Internal divided backplane clock */
666 baud_base /= div;
667 } else {
668 /* Assume external clock of 1.8432 MHz */
669 baud_base = 1843200;
670 }
671 }
672 }
673
674 /* Determine the registers of the UARTs */
675 n = (cc->capabilities & SSB_CHIPCO_CAP_NRUART);
676 for (i = 0; i < n; i++) {
677 void __iomem *cc_mmio;
678 void __iomem *uart_regs;
679
680 cc_mmio = cc->dev->bus->mmio + (cc->dev->core_index * SSB_CORE_SIZE);
681 uart_regs = cc_mmio + SSB_CHIPCO_UART0_DATA;
682 /* Offset changed at after rev 0 */
683 if (ccrev == 0)
684 uart_regs += (i * 8);
685 else
686 uart_regs += (i * 256);
687
688 nr_ports++;
689 ports[i].regs = uart_regs;
690 ports[i].irq = irq;
691 ports[i].baud_base = baud_base;
692 ports[i].reg_shift = 0;
693 }
694
695 return nr_ports;
696}
697#endif /* CONFIG_SSB_SERIAL */